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Objective
Maternal pre-pregnancy underweight, overweight and obesity might increase the risk for worse short- and long-term outcome in the offspring. There is a need for further study into the relationship between maternal pre-pregnancy body mass index (BMI) and the combined outcome of physical development, state of health and social behavior in children. Question: Is maternal pre-pregnancy BMI associated with the child outcome in terms of physical development, state of health and social behavior (school and leisure time behavior) at the age of 9 to 15 years?
Methods
In the population-based birth cohort study Survey of Neonates in Pomerania (SNIP) children at the age 9–15 years and their families were re-examined by questionnaire-based follow-up. 5725 mother–child pairs were invited to SNiP-follow-up. This analysis is based on the recall fraction of 24.1% (n = 1379). Based on the maternal pre-pregnancy BMI (ppBMI), 4 groups were formed: underweight (ppBMI < 19 kg/m2, n = 117), normal weight (ppBMI 19–24.99 kg/m2, n = 913, reference), overweight (ppBMI 25–30 kg). /m2, n = 237) and obesity (ppBMI > 30 kg/m2, n = 109).
Results
In the multiple regression model, the BMI-z-score for children of mothers in the underweight group was −0.50 lower, and 0.50/1.07 higher in the overweight/obese group (p < 0.001) compared to reference at median age of 12 years. No differences were found in children of underweight mothers with regard to social behavior (interaction with friends and family), school and sports performance (coded from “very good” to “poor”), other leisure activities (watching television, using mobile phones, gaming), and health (occurrence of illnesses) compared to children of normal weight mothers. In contrast, maternal pre-pregnancy overweight and obesity were associated with lower school and sports performance, and higher screen time (smart phone, gaming, television) compared to children of normal weight mothers.
Conclusion
Maternal pre-pregnancy overweight and obesity but not underweight was negatively associated with school performance and leisure time behavior in the offspring at 9–15 years of age.
There is still considerable controversy surrounding the impact of mastication on obesity. The aim of this study was to identify the interplay between the masticatory muscles, teeth, and general muscular fitness and how they contribute to body adiposity in a general German population. This cross-sectional study included 616 participants (300 male, 316 female, age 31–93 years) from the population-based Study of Health in Pomerania. The cross-sectional areas of the masseter, medial and lateral pterygoid muscles were measured using magnetic resonance imaging (MRI), muscular fitness assessed by hand grip strength (HGS) and body fat distribution was measured by bioelectrical impedance analysis (BIA) and MRI. The overall prevalence of obesity was high in our cohort. The cross-sectional area of the masseter muscles was positively associated with the number of teeth, body mass index (BMI) and HGS, and negatively associated with the BIA-assessed body fat when adjusted for age, sex, teeth, and BMI. Especially the correlation was strong (p < 0.001). Analogous relationships were observed between the masseter, HGS and MRI-assessed subcutaneous fat. These associations were most pronounced with masseter, but also significant with both pterygoid muscles. Though the masticatory muscles were affected by the number of teeth, teeth had no impact on the relations between masseter muscle and adiposity. Physical fitness and masticatory performance are associated with body shape, controlled and directed by the relevant muscles.
Das Pankreaskarzinom zählt zu den fünf häufigsten Krebserkrankungen in Deutschland, die durch eine spät einsetzende Symptomatik und ein schnelles Wachstum zum Zeitpunkt der Diagnose eine minimale Aussicht auf Heilungserfolg hat. Ziel dieser Arbeit war es, die onkolytische Therapie des Pankreaskarzinoms sicherer zu machen und eine bessere Implementierung in den klinischen Alltag zu erreichen.
In vorherigen Tierversuchen dieser Arbeitsgruppe wurde das Virus im aktiven oder inaktiven Zustand intravenös appliziert und so eine in vivo Stimulation von Spendermäusen vorgenommen. Nach adoptivem Zelltransfer dieser stimulierten Splenozyten in tumortragenden Mäusen konnte eine Onkolyse beobachtet werden, jedoch war die Versuchsdurchführung hinsichtlich der klinischen Anwendung noch zu fern. Aus diesen vorangegangenen Versuchen entwickelte sich das in dieser Arbeit besprochene Modell in dem die Stimulation von entnommenen Splenozyten oder Blutleukozyten in vitro erfolgt. Zusätzlich wurde überprüft, ob nach der Behandlung des Organismus eine weitere Virusübertragung stattfinden kann.
Der Transfer in tumortragende Mäuse wurde zu zwei Zeitpunkten (24h und 72h nach in vitro Stimulation) vorgenommen. Die Onkolyse war zu beiden Zeitpunkten und mit beiden Leukozytengruppen erfolgreich, sodass die Tumore makroskopisch nicht mehr zu erkennen waren oder 10% des Volumens der Kontrollgruppen maßen. Darüberhinaus wurden die reisolierten Tumorzellen der Versuchstiere hinsichtlich der Veränderung ihrer Oberflächenproteine sowie die mesenteriale Lymphknoten auf die Veränderung der Leukozytenpopulationen analysiert. Die Ergebnisse zeigten, dass die Anzahl regulatorischer T-Lymphozyten, deren Rolle die Immunsuppression sowohl im physiologischen als auch im pathologischen Milieu ist, nach dem Transfer von stimulierten Leukozyten deutlich abnimmt. Die Analyse der reisolierten Tumorzellen hat gezeigt, dass die Menge von MHC I ansteigt und die des PD-L1 sinkt, wodurch die Tumorzellen anfälliger für den zytotoxischen Angriff durch T-Lymphozyten sind. Diese Ergebnisse liefern den deutlichen Hinweis, dass der Rückgang der Tumormasse nicht auf das aktive Virus im Organismus, sondern auf die Aufhebung der Immunsuppression und die Erhöhung der Immunogenität des Tumors zurückzuführen ist.
Decreased inflammatory profile in oral leukoplakia tissue exposed to cold physical plasma ex vivo
(2023)
Background
Oral leukoplakia (OL) is an unfavorable oral disease often resistant to therapy. To this end, cold physical plasma technology was explored as a novel therapeutic agent in an experimental setup.
Methods
Biopsies with a diameter of 3 mm were obtained from non-diseased and OL tissues. Subsequently, cold atmospheric pressure plasma (CAP) exposure was performed ex vivo in the laboratory. After 20 h of incubation, biopsies were cryo-conserved, and tissue sections were quantified for lymphocyte infiltrates, discriminating between naïve and memory cytotoxic and T-helper cells. In addition, the secretion pattern related to inflammation was investigated in the tissue culture supernatants by quantifying 10 chemokines and cytokines.
Results
In CAP-treated OL tissue, significantly decreased overall lymphocyte numbers were observed. In addition, reduced levels were observed when discriminating for the T-cell subpopulations but did not reach statistical significance. Moreover, CAP treatment significantly reduced levels of C-X-C motif chemokine 10 (CXCL10) and granulocyte-macrophage colony-stimulating factor in the OL biopsies' supernatants. In idiopathically inflamed tissues, ex vivo CAP exposure reduced T-cells and CXCL10 as well but also led to markedly increased interleukin-1β secretion.
Conclusion
Our findings suggest CAP to have immuno-modulatory properties, which could be of therapeutic significance in the therapy of OL. Future studies should investigate the efficacy of CAP therapy in vivo in a larger cohort.
Advances in spine surgery enable technically safe interventions in older patients with disabling spine disease, yet postoperative delirium (POD) poses a serious risk for postoperative recovery. This study investigates biomarkers of pro-neuroinflammatory states that may help objectively define the pre-operative risk for POD. This study enrolled patients aged ≥60 scheduled for elective spine surgery under general anesthesia. Biomarkers for a pro-neuroinflammatory state included S100 calcium-binding protein β (S100β), brain-derived neurotrophic factor (BDNF), Gasdermin D, and the soluble ectodomain of the triggering receptor expressed on myeloid cells 2 (sTREM2). Postoperative changes of Interleukin-6 (IL-6), Interleukin-1β (IL-1β), and C-reactive protein (CRP) were assessed as markers of systemic inflammation preoperatively, intraoperatively, and early postoperatively (up to 48 h). Patients with POD (n = 19, 75.7 ± 5.8 years) had higher pre-operative levels of sTREM2 (128.2 ± 69.4 pg/mL vs. 97.2 ± 52.0 pg/mL, p = 0.049) and Gasdermin D (2.9 ± 1.6 pg/mL vs. 2.1 ± 1.4 pg/mL, p = 0.29) than those without POD (n = 25, 75.6 ± 5.1 years). STREM2 was additionally a predictor for POD (OR = 1.01/(pg/mL) [1.00–1.03], p = 0.05), moderated by IL-6 (Wald-χ2 = 4.06, p = 0.04). Patients with POD additionally showed a significant increase in IL-6, IL-1β, and S100β levels on the first postoperative day. This study identified higher levels of sTREM2 and Gasdermin D as potential markers of a pro-neuroinflammatory state that predisposes to the development of POD. Future studies should confirm these results in a larger cohort and determine their potential as an objective biomarker to inform delirium prevention strategies.
Aims
Sphingosine-1-phosphate (S1P) is a signaling lipid, which is involved in several cellular processes including cell growth, proliferation, migration and apoptosis. The associations of serum S1P levels with cardiac geometry and function are still not clear. We investigated the associations of S1P with cardiac structure and systolic function in a population-based sample.
Methods and results
We performed cross-sectional analyses of 858 subjects (467 men; 54.4%), aged 22 to 81 years, from a sub-sample of the population-based Study of Health in Pomerania (SHIP-TREND-0). We analyzed the associations of serum S1P with structural and systolic function left ventricular (LV) and left atrial (LA) parameters as determined by magnetic resonance imaging (MRI) using sex-stratified multivariable-adjusted linear regression models. In men, MRI data showed that a 1 µmol/L lower S1P concentration was associated with an 18.1 mL (95% confidence interval [CI] 3.66–32.6; p = 0.014) larger LV end-diastolic volume (LVEDV), a 0.46 mm (95% CI 0.04–0.89; p = 0.034) greater LV wall thickness (LVWT) and a 16.3 g (95% CI 6.55–26.1; p = 0.001) higher LV mass (LVM). S1P was also associated with a 13.3 mL/beat (95% CI 4.49–22.1; p = 0.003) greater LV stroke volume (LVSV), an 18.7 cJ (95% CI 6.43–30.9; p = 0.003) greater LV stroke work (LVSW) and a 12.6 mL (95% CI 1.03–24.3; p = 0.033) larger LA end-diastolic volume (LAEDV). We did not find any significant associations in women.
Conclusions
In this population-based sample, lower levels of S1P were associated with higher LV wall thickness and mass, larger LV and LA chamber sizes and greater stroke volume and work of the LV in men, but not in women. Our results indicate that lower levels of S1P were associated with parameters related with cardiac geometry and systolic function in men, but not in women.
Hintergrund
Zu Beginn des Covid-19-Pandemiegeschehens wurde die ambulante Patientenversorgung deutschlandweit vor große Herausforderungen gestellt. Insbesondere die mangelnde Verfügbarkeit von Schutzausrüstung und eine vermutete Überforderung des ambulanten und stationären Sektors machten die Entwicklung alternativer Versorgungsmodelle notwendig.
Auf Aufforderung der Landesregierung wurde von der Universitätsmedizin Greifswald eine sogenannte Fieberambulanz für Patienten mit möglichen Symptomen einer Covid-19-Infektion eingerichtet, die nicht telefonisch abgeklärt werden konnten.
Methoden
Es handelt sich um eine Mixed-Methods-Studie.
Im quantitativen Teil der Studie erfolgten die Auswertung des Konsultationsanlasses, der Symptome sowie Beratungsergebnisse mit einem selbst entwickelten Fragebogen. Einnahmen und Ausgaben der Fieberambulanz wurden erfasst.
Retrospektiv wurden leitfadengestützte Experteninterviews mit den hauptverantwortlichen Mitarbeitern der Fieberambulanz Greifswald, sowie niedergelassenen Ärzten und Vertretern aus den Bereichen Hygiene, sowie der Kassenärztlichen Vereinigung MV und dem Landkreis Vorpommern-Greifswald geführt.
Ergebnisse
Es gelang innerhalb von zehn Tagen, die Fieberambulanz in den Räumlichkeiten einer Berufsschule aufzubauen. Besondere Herausforderungen, die in den Interviews beschrieben wurden, waren die Organisation von Logistik und Personal, Klärung der Verantwortlichkeiten, Kostenträgerschaft und Abrechnung. Es wurden Grenzen und Schwächen der Fieberambulanz aufgezeigt, sowie alternative Versorgungsmodelle in den Interviews diskutiert.
Im Zeitraum vom 08.04.-11.05.2020 wurden insgesamt 107 Konsultationen durchgeführt (53 % weiblich, Ø42 Jahre), bei deutlich mehr telefonischen Anfragen. Die häufigsten Diagnosen waren akute Bronchitis (43%), obere Atemwegsinfekte (28%) und Fieber (8,4%).
In 42 Fällen wurde ein Nasen-Rachen-Abstrich durchgeführt. Schwerere Erkrankungen wie eitrige Tonsillitiden oder Asthma Exazerbationen wurden in <10% der Fälle diagnostiziert. Covid-19-Neuinfektionen wurden nicht nachgewiesen. Eine kosteneffiziente Auslastung konnte nicht erreicht werden.
Schlussfolgerung
Die Fieberambulanz wurde zu Pandemiebeginn als Anlaufstelle für Unsicherheiten im Umgang mit dem Infektionsgeschehen genutzt, als viele Versorgungssituationen noch ungeregelt waren. Sie erwies sich aber rückblickend bei niedriger Inzidenz als unwirtschaftlich und nicht notwendig. Der Großteil der Patienten konnte weiterhin hausärztlich betreut werden.
Background
Lower cortisol concentrations in adulthood were repeatedly associated with more severe childhood maltreatment. Additionally, childhood maltreatment was reported to promote health risk behavior, such as smoking or alcohol consumption, and to increase the risk of mental and somatic diseases during adulthood, such as major depressive disorders or obesity. The present study investigated if health risk behavior and disease symptoms in adults mediate the associations between past childhood maltreatment and present basal serum cortisol concentrations.
Methods
Data from two independent adult cohorts of the general population-based Study of Health in Pomerania (SHIP-TREND-0: N = 3,517; SHIP-START-2: N = 1,640) was used. Childhood maltreatment was assessed via the Childhood Trauma Questionnaire (CTQ). Cortisol concentrations were measured in single-point serum samples. Health risk behavior and mental and physical symptoms were used as mediators. Mediation analyses were calculated separately for both cohorts; results were integrated via meta-analyses.
Results
In mediator-separated analyses, associations between childhood maltreatment and basal serum cortisol concentrations were partly mediated by depressive symptoms (BDI-II: βindirect effect = -.011, pFDR = .017, 21.0% mediated) and subjective somatic health complaints (somatic complaints: βindirect effect = -.010, pFDR = .005, 19.4% mediated). In the second step, both mediators were simultaneously integrated into one mediation model. The model replicated the mediation effects of the subjective somatic health complaints (whole model: βindirect effect = -.014, p = .001, 27.6% mediated; BDI-II: βindirect effect = -.006, p = .163, 11.4% mediated, somatic complaints: βindirect effect = -.020, p = .020, 15.5% mediated).
Conclusion
The results support the hypothesis that the long-lasting effects of childhood maltreatment on the stress response system are partly mediated through self-perceived disease symptoms. However, no mediation was found for health risk behavior or physically measured mediators. Mediation models with multiple simultaneous mediators pointed to a relevant overlap between the potential mediators. This overlap should be focused on in future studies.
Introduction: Vessel-associated retinal diseases are a major cause of blindness and severe visual impairment. The identification of appropriate biomarkers is of great importance to better anticipate disease progression and establish more targeted treatment options. MicroRNAs (miRNAs) are short, single-stranded, noncoding ribonucleic acids that are involved in the posttranscriptional regulation of gene expression through hybridization with messenger RNA. The expression of certain miRNAs can be different in patients with pathological processes and can be used for the detection and differentiation of various diseases. In this study, we investigate to what extent previously in vitro identified miRNAs are present as cell-free circulating miRNAs in the serum and vitreous of human patients with and without vessel-associated retinal diseases. Methods: Relative quantification by quantitative real-time polymerase chain reaction was used to analyze miRNA expression in patients with vessel-associated retinal diseases such as age-related macular degeneration (AMD), diabetic retinopathy (DR), and retinal vein occlusion compared with control patients. Results: In serum samples, miR-29a-3p and miR-192-5p showed increased expression in patients with neovascular AMD relative to control patients. Similarly, miR-335-5p, miR-192-5p, and miR-194-5p showed increased expression in serum from patients with proliferative DR. In vitreous samples, miR-100-5p was decreased in patients with proliferative DR. Differentially expressed miRNAs showed good diagnostic accuracy in receiver operating characteristic (ROC) and area under the ROC curve analysis. Conclusion: The miRNAs investigated in this study may have the potential to serve as biomarkers for vessel-associated retinal diseases. Combining multiple miRNAs may enhance the predictive power of the analysis.
Background
Early diagnosis is mandatory for the medical care of children and adolescents with pediatric-onset inflammatory bowel disease (PIBD). International guidelines (‘Porto criteria’) of the European Society for Pediatric Gastroenterology, Hepatology and Nutrition recommend medical diagnostic procedures in PIBD. Since 2004, German and Austrian pediatric gastroenterologists document diagnostic and treatment data in the patient registry CEDATA-GPGE on a voluntary basis. The aim of this retrospective study was to analyze whether the registry CEDATA-GPGE reflects the Porto criteria and to what extent diagnostic measures of PIBD according to the Porto criteria are documented.
Methods
Data of CEDATA-GPGE were analyzed for the period January 2014 to December 2018. Variables representing the Porto criteria for initial diagnostic were identified and categorized. The average of the number of measures documented in each category was calculated for the diagnoses CD, UC, and IBD-U. Differences between the diagnoses were tested by Chi-square test. Data on possible differences between data documented in the registry and diagnostic procedures that were actually performed were obtained via a sample survey.
Results
There were 547 patients included in the analysis. The median age of patients with incident CD (n = 289) was 13.6 years (IQR: 11.2–15.2), of patients with UC (n = 212) 13.1 years (IQR: 10.4–14.8) and of patients with IBD-U (n = 46) 12.2 years (IQR: 8.6–14.7).
The variables identified in the registry fully reflect the recommendations by the Porto criteria. Only the disease activity indices PUCAI and PCDAI were not directly provided by participants but calculated from obtained data. The category ‘Case history’ were documented for the largest part (78.0%), the category ‘Imaging of the small bowel’ were documented least frequently (39.1%). In patients with CD, the categories ‘Imaging of the small bowel’ (χ2 = 20.7, Cramer-V = 0.2, p < 0.001) and ‘Puberty stage’ (χ2 = 9.8, Cramer-V = 0.1, p < 0.05) were documented more often than in patients with UC and IBD-U.
Conclusion
The registry fully reproduces the guideline’s recommendations for the initial diagnosis of PIBD. The proportion of documented diagnostic examinations varied within the diagnostic categories and between the diagnoses. Despite technological innovations, time and personnel capacities at participating centers and study center are necessary to ensure reliable data entry and to enable researchers to derive important insights into guideline-based care.
In musculoskeletal surgery, the treatment of large bone defects is challenging and can require the use of bone graft substitutes to restore mechanical stability and promote host-mediated regeneration. The use of bone allografts is well-established in many bone regenerative procedures, but is associated with low rates of ingrowth due to pre-therapeutic graft processing. Cold physical plasma (CPP), a partially ionized gas that simultaneously generates reactive oxygen (O2) and nitrogen (N2) species, is suggested to be advantageous in biomedical implant processing. CPP is a promising tool in allograft processing for improving surface characteristics of bone allografts towards enhanced cellularization and osteoconduction. However, a preclinical assessment regarding the feasibility of pre-therapeutic processing of allogeneic bone grafts with CPP has not yet been performed. Thus, this pilot study aimed to analyze the bone morphology of CPP processed allografts using synchrotron radiation-based microcomputed tomography (SR-µCT) and to analyze the effects of CPP processing on human bone cell viability and function. The analyzes, including co-registration of pre- and post-treatment SR-µCT scans, revealed that the main bone morphological properties (total volume, mineralized volume, surface area, and porosity) remained unaffected by CPP treatment if compared to allografts not treated with CPP. Varying effects on cellular metabolic activity and alkaline phosphatase activity were found in response to different gas mixtures and treatment durations employed for CPP application. It was found that 3 min CPP treatment using a He + 0.1% N2 gas mixture led to the most favourable outcome regarding a significant increase in bone cell viability and alkaline phosphatase activity. This study highlights the promising potential of pre-therapeuthic bone allograft processing by CPP prior to intraoperative application and emphasizes the need for gas source and treatment time optimization for specific applications.
Aerocom® (Schwäbisch Gmünd, Deutschland) hat einen neuen Prototyp für Rohrpostsysteme entwickelt, der eine Transportkapazität von bis zu 9 Blutröhrchen hat. Diese werden beim Schließen des Deckels automatisch fixiert. In dieser Studie wurde der Einfluss des Transports auf die Qualität der Blutproben unter Verwendung des Prototyps im Vergleich zum Kuriertransport und der konventionellen Rohrpostkartusche (AD160, Aerocom®) untersucht.
Sets aus je drei Blutprobenröhrchen (1 Lithium-Heparin, 1 EDTA, 1 Natrium-Zitrat) von insgesamt 35 Probanden wurden zufällig auf die drei Transportmethoden Kurier, konventionelle Rohrpostkartusche und den Kartuschenprototypen verteilt. Nach dem Transport wurden 51 Messgrößen aus der klinischen Chemie, Hämatologie und Gerinnung ermittelt und miteinander verglichen.
Insgesamt zeigten 49 der 51 untersuchten Messgrößen eine gute Übereinstimmung zwischen den drei Transporttypen, insbesondere zwischen der konventionellen Kartusche und dem Kartuschenenprototyp. Im Blick auf die bekannten hämolysesensitiven Messgrößen zeigte Kalium keine statistisch signifikanten Diskrepanzen. Bei der Laktatdehydrogenase (LDH) und dem freien Hämoglobin (fHb) ergaben sich jedoch statistisch signifikante Unterschiede jeweils zwischen den Werten für Kurier und den beiden Rohrpostkartuschen, wobei diese Unterschiede aus klinischer Sicht zu vernachlässigen sind. So lag die mittlere Konzentration von fHb bei 0,29 g/L (18 µMol/L), 0,31 g/L (19 µMol/L) bzw. 0,32 g/L (20 µMol/L) für den Kuriertransport, die konventionelle Kartusche und den Kartuschenprototyp. Diese Unterschiede lassen sich analytisch nicht auflösen, da die minimale Differenz (MD) für fHb bei dieser Konzentration 0,052 g/L (3,23 µMol/L) beträgt.
Abschließend stellen wir fest, dass der Prototyp von Aerocom® für den Transport von diagnostischen Blutproben geeignet ist. Der gesamte Arbeitsablauf wird mithilfe dieses Prototyps maßgeblich verbessert, indem die Arbeitszeit auf der Station und im Labor verringert und gleichzeitig das Risiko für Hämolyse durch unzureichend oder falsch verpackte Proben minimiert wird.
Orale Kontrazeptiva wurden 1960 zugelassen und erfreuen sich seitdem einer großen Beliebtheit. So gelten sie als eine der sichersten Verhütungsmethoden und haben auch weitere positive Effekte wie zum Beispiel eine Zyklusregulation und Abschwächen von Menstruationsbeschwerden. Nichtsdestotrotz leiden auch viele Nutzerinnen an Nebenwirkungen. In unserer und weiteren Studien konnte gezeigt werden, dass die Einnahme von oralen Kontrazeptiva die Serumcortisolkonzentration erhöht. Cortisol ist ein Steroidhormon, welches in Stresssituationen nötig ist, um die Homöostase beizubehalten und hat somit einen Einfluss auf den Stoffwechsel. Metabolite sind messbare Bestandteile des Stoffwechsels, da sie als Substrate und Produkte von Stoffwechselwegen Auskunft über die Prozesse des Körpers geben können. Sie unterliegen den vielfältigsten Einflussgrößen. Daher behandelt diese Dissertation den Einfluss von oralen Kontrazeptiva auf die Serumcortisolkonzentration und die Veränderung des Metaboloms. In einem weiteren Schritt wurde die Beeinflussung des Effekts von oralen Kontrazeptiva auf das Metabolom durch Cortisol berechnet.
Die Teilnehmerinnen der Studie waren prämenopausale Frauen, die im Rahmen einer Datenerhebung in der Durchschnittsbevölkerung im Nordosten Deutschlands rekrutiert wurden und zwei unabhängigen Stichproben angehörten (SHIP-TREND und SHIP-2).
Auch hier zeigten sich erhöhte Serumcortisolkonzentrationen bei Frauen, die orale Kontrazeptiva einnahmen. Des Weiteren konnten Metabolitveränderungen festgestellt werden, wie zum Beispiel 12 erhöhte Phosphatidylcholine, fünf erniedrigte und ein erhöhtes Lysophosphatidylcholine, fünf erniedrigte Aminosäuren und ein Carnitin, sowie ein erhöhtes Sphingomyelin. Auf den Großteil dieser Veränderungen hatte Cortisol einen signifikanten Einfluss in der Mediationsanalyse, wogegen die Menstruation nicht als Einflussfaktor nachgewiesen werden konnte.
Diese Studie stellt einen ersten Schritt zur Charakterisierung des Metaboloms bei der Einnahme von oralen Kontrazeptiva dar. Orale Kontrazeptiva haben einen systemischen Effekt und das Profil des Metaboloms könnte bei einer immer weiter individualisierten Medizin dazu beitragen, Frauen mit einem erhöhten Risiko für starke Nebenwirkungen der oralen Kontrazeptiva zu identifizieren, was zu einer Einnahme von besser geeigneten alternativen Verhütungsmethoden führen könnte.
Background
Short-term infusions of dinutuximab beta plus isotretinoin and cytokines administered in previous immunotherapy studies in neuroblastoma were associated with severe pain. Here, long-term, continuous infusion of single-agent dinutuximab beta was evaluated in patients with relapsed/refractory neuroblastoma.
Methods
In this open-label, single-arm, Phase 2 study, patients with either refractory or relapsed high-risk neuroblastoma received dinutuximab beta by continuous infusion over 10 days of each cycle, for up to five cycles. The primary endpoint was objective response rate 24 weeks after the end of cycle 5. Secondary endpoints included adverse events, intravenous morphine use, best response, duration of response, and three-year progression-free and overall survival.
Results
Of the 40 patients included, 38 had evaluable response. Objective response rate was 26% and best response rate 37%. Median duration of response was 238 days (IQR 108–290). Three-year progression-free and overall survival rates were 31% (95% CI 17–47) and 66% (95% CI 47–79), respectively. Prophylactic intravenous morphine use and duration of use decreased with increasing cycles. The most common grade 3 treatment-related adverse events were pain, diarrhea, and hypokalemia.
Conclusion
Long-term continuous infusion of single-agent dinutuximab beta is tolerable and associated with clinically meaningful responses in patients with relapsed/refractory high-risk neuroblastoma.
Clinical trial registration
The study is registered with ClinicalTrials.gov (NCT02743429) and EudraCT (2014-000588-42).
Age is the single biggest risk factor for most major human diseases. As such, understanding the intricate molecular changes that drive biological aging holds great promise in attempting to slow
the onset of systemic diseases and thereby increase the effective health-span in modern societies.
This thesis explores several computational approaches to capture and analyze the molecular biological alterations triggered by intrinsic and extrinsic aging using skin as a model tissue to deliver genes and pathways as potential targets for intervention strategies.
Publication 1 demonstrates the utility of multi-omics data integration strategies for aging research, leading to the identification of four latent aging phases in skin tissue through an integrated cluster analysis of gene expression and DNA methylation data. The four phases improved the detection of molecular aging signals and were shown to be associated with sunbathing habits of the test subjects. Deeper analysis revealed extensive non-linear alterations in various biological pathways particularly at the transition into the fourth aging phase, coinciding with menopause, with potentially wide-reaching functional implications. Publication 2 describes the development of a novel type of age clock, that provides a new level of interpretability by embedding biological pathway information in the architecture of an artificial neural network. The clock not only generates meaningful biological age estimates from gene expression data, but further allows simultaneous monitoring of the aging states of various biological processes through the activations of intermediate neurons. Analyses of the inner workings of the clock revealed a wide-spread impact of aging on the global pathway landscape. Simulation experiments using the transcriptomic clock recapitulated known functional aging gene associations and allowed deciphering of the pathways by which accelerated aging conditions such as chronic sun exposure and Hutchinson-Gilford progeria syndrome exert their effects. Publication 3 further explores the molecular alterations caused by the pro-aging effector UV irradiation in the skin. The multi-omics data analysis of repetitively irradiated skin revealed signs of the immediate acquisition of aging- and cancer-related epigenetic signatures and concurrent wide-spread transcriptional changes across various biological processes. Investigations into the varying resilience to irradiation between subjects revealed prognostic biomarker signatures capable of predicting individual UV tolerances, with accuracies far surpassing the traditional Fitzpatrick classification scheme. Further analysis of the transcripts and pathways associated with UV tolerance identified a form of melanin-independent DNA damage protection in individuals with higher innate UV resilience.
Together, the approaches and findings described in this thesis explore several new angles to advance our understanding of aging processes and external drivers of aging such as UV irradiation in the human skin and deliver new insight on target genes and pathways involved.
The goal of this study was to assess the anticancer efficacy of chlorojanerin against various cancer cells. The effects of chlorojanerin on cell cytotoxicity, cell cycle arrest, and cell apoptosis were examined using MTT assay, propidium iodide staining, and FITC Annexin V assay. RT-PCR was employed to determine the expression levels of apoptosis-related genes. Furthermore, docking simulations were utilized to further elucidate the binding preferences of chlorojanerin with Bcl-2. According to MTT assay, chlorojanerin inhibited the proliferation of all tested cells in a dose-dependent manner with a promising effect against A549 lung cancer cells with an IC50 of 10 µM. Cell growth inhibition by chlorojanerin was linked with G2/M phase cell cycle arrest in A549 treated cells. Flow cytometry analysis indicated that the proliferation inhibition effect of chlorojanerin was associated with apoptosis induction in A549 cells. Remarkably, chlorojanerin altered the expression of many genes involved in apoptosis initiation. Moreover, we determined that chlorojanerin fit into the active site of Bcl-2 according to the molecular docking study. Collectively, our results demonstrate that chlorojanerin mediated an anticancer effect involving cell cycle arrest and apoptotic cell death and, therefore, could potentially serve as a therapeutic agent in lung cancer treatment.
Das Glioblastom ist ein hochmaligner und aggressiver Hirntumor, der von der WHO als Grad IV eingestuft wird. Die Betroffenen haben eine mittlere Überlebenszeit von 12 bis 15 Monaten, was auf dem invasiven Wachstum und der Chemo- und Radioresistenz des Tumors beruht. Dadurch existiert keine kurative Behandlung und es kommt in nahezu allen Fällen zu Rezidiven. Zunehmend wird deutlich, dass das Glioblastom einen stark veränderten Energiestoffwechsel aufweist, wobei das sogenannte lipidomic remodelling (Koundouros und Poulogiannis, 2020), welches für maßgebliche Alterationen im Fettsäuremetabolismus sorgt, besonders interessant erscheint. Die Fettsäureoxidation sowie damit assoziierte Prozesse und Proteine sind als eine bedeutende Energiequelle in den Fokus der Forschung getreten. So auch der hoch-affine Carnitintransporter OCTN2 (SLC22A5), welcher essentiell für den Carnitinhaushalt und damit die β-Oxidation der Zelle ist. In der vorgelegten Arbeit wurde daher das komplexe OCTN2/L-Carnitin System in seiner Funktion als potenzielle pharmakologische Zielstruktur zur therapeutischen Intervention beim Glioblastom tiefergehend untersucht und vorhandenes Wissen weiter ausgebaut. Hierzu diente eine Vielzahl experimenteller Bedingungen und Methoden, um Teilcharakteristiken des Glioblastoms darzustellen und die Bedeutung des OCTN2/L-Carnitin System zu überprüfen.
Da in vorausgegangenen Studien eine erhöhte Expression von OCTN2 mit einem signifikant schlechteren Überleben von Patienten mit Glioblastom nachgewiesen werden konnte, wurden als weitere potentiell interessante Zielstrukturen der niedrig-affine Carnitintransporter OCTN1 (SLC22A4) sowie Komponenten der β-Oxidation (CPT1C, CRAT) in die Patientenanalysen eingeschlossen. Zwar konnte für OCTN1 eine signifikant erhöhte mRNA-Expression in den humanen Glioblastomproben festgestellt werden, diese war jedoch nicht mit dem Überleben der Patienten assoziiert. Auch CPT1C und CRAT zeigten sich nicht als relevante Zielstrukturen beim Glioblastom.
In den durchgeführten Zellkulturexperimenten mit humanen LN-18 und murinen GL261 Glioblastomzellen zeigten sich partiell signifikante Effekte auf die wachstumsfördernden Kinasen AKT1 und ERK1/2, deren Phosphorylierungsgrad durch L-Carnitin moduliert wurde und die damit möglicherweise an carnitinvermittelten Wirkungen beteiligt sein könnten. Auf die Zellviabilität und Zellvitalität ließen sich hemmende Wirkungen des OCTN2-Inhibitors Meldonium sowie des CPT1-Hemmstoffes Etomoxir nachweisen, welche teilweise durch die zusätzliche Gabe von L-Carnitin revertiert wurden. Hinsichtlich der durch Zytostatika (Doxorubicin, Carmustin, Vincristin und Temozolomid) induzierten Apoptose konnte L-Carnitin nur die durch Carmustin in niedriger Dosierung ausgelöste Caspase-3 Aktivierung verhindern. Ein durch L-Carnitin ausgelöster Effekt auf die Migration der Glioblastomzellen konnte nicht nachgewiesen werden, jedoch wurde die migratorische Aktivität durch die Zytostatika Temozolomid und Carmustin, sowie interessanterweise auch durch den CPT1-Inhibitor Etomoxir, beeinträchtigt.
Um die Möglichkeit einer zielgerichteten Therapie gegen das OCTN2/L-Carnitin System präklinisch zu evaluieren, wurden tierexperimentelle Studien durchgeführt. Unter Verwendung eines orthotopen Glioblastommodelles der Maus konnte gezeigt werden, dass Etomoxir und Meldonium einen hemmenden Einfluss auf das in vivo Tumorwachstum besitzen, wobei dieser Effekt nur für den OCTN2-Inhibitor Meldonium signifikant ausfiel. In den OCTN2-defizienten jvs(-/-)-Mäusen konnte keine ausreichende Anzahl von Versuchstieren erreicht werden, um zuverlässige und finale Aussagen zu tätigen. In den heterozygoten jvs(+/-)-Mäusen, die zwar phänotypisch unauffällig sind, aber durch die geringere OCTN2 Ausstattung verminderte Carnitin-Gewebespiegel aufweisen, zeigte sich eine leichte, nicht signifikante Reduktion des intrazerebralen Tumorwachstums im Vergleich zu den C57BL/6-Wildtyp Mäusen.
Zusammenfassend wurde in der vorliegenden Arbeit das OCTN2/L-Carnitin System und seine Bedeutung für das Glioblastom umfassend dargelegt und experimentell überprüft. Als Endresultat dieser Studie können Etomoxir und Meldonium als Substanzen zur zielgerichteten Beeinflussung des Glioblastomwachstums angesehen werden und sollten in weiteren Versuchsreihen detailliert auf ihre Eignung für die Entwicklung neuer Therapieformen überprüft werden.
In dieser retrospektiven Studie sind ausgehend von 527 der Gesamtkohorte 345 Patienten mit einer CTEPH analysiert worden. Die Stratifizierung der Patienten erfolgte in zwei Gruppen: Der konventionellen Gruppe, in der Patienten eine medikamentöse PH-Therapie erhalten haben, und der interventionellen Gruppe, in der Patienten eine Intervention in Form einer pulmonalen Endarteriektomie (PEA) oder einer pulmonalen Ballonangioplastie (BPA) erhalten haben. Der Beobachtungszeitraum erstreckte sich vom 01.01.2002 bis zum 31.12.2020. In der gesamten Nachbeobachtungszeit (Median: 3.5 Jahre; mean ± SD, 4.4 ± 3.6 Jahre) starben ins-gesamt 78 Patienten, entsprechend einem Prozentsatz von 22.6 % (n = 345), davon in der konventionellen Gruppe 29 % (n = 60) und in der interventionellen Gruppe 13 % (n = 18).
Die wichtigste Schlussfolgerung der vorliegenden Arbeit ist der prädiktive Vorhersagewert der Überlebenswahrscheinlichkeit der mittels CPET bestimmten maximal Sauerstoffaufnahme VO2 (Peak) für Patienten, die aus verschiedensten Gründen keiner interventionellen Therapie im Sinne der etablierten pulmonale Endarteriektomie (PEA) oder der pulmonale Ballonangioplastie (BPA) zugänglich sind. Die in dieser Studie untersuchten Parameter, die zu Beginn des Beobachtungszeitraums. d. h. vor der Intervention, erhoben wurden, lassen in der interventionellen Gruppe keine verlässliche Vorhersage für das Überleben zu. In der konventionellen Gruppe konnten in der vorliegenden Arbeit jedoch eine Vielzahl an prognoserelevanten Parametern identifiziert werden. Maßgeblich sind dies neben der bereits erwähnten VO2 (Peak) [% SW] die Parameter PET CO2 in Ruhe und an der AT, die VE/VCO2 in Ruhe und an der AT. Der VE/VCO2-Slope und die PET CO2 (Peak) sind ebenso prognoserelevant.
Größere Studienkollektive mit einem längeren Beobachtungszeitraum könnten sich mit einer höheren Sensitivität auch der Frage widmen, ob es nicht doch einen relevanten CPET-Parameter zur Prognoseabschätzung auch bei interventionell versorgten Patienten gibt. Ein Ansatz da-für wäre CPET-Untersuchungen in definierten Zeitintervallen nach der operativen Intervention.
Weiterführende Studien sollten zudem unter diesem Aspekt auch die Frage des Einsatzes der CPET über die Basisdiagnostik hinaus als Verlaufsparameter untersuchen und außerdem auf längere Beobachtungsphasen ausgedehnt werden, um weitere Langzeitdaten erheben zu können.
Das Neuroblastom (NB) stellt als Tumor des sympathischen Nervenstranges den häufigsten extrakraniellen soliden Tumor des Kindesalters dar. Ein Bedarf innovativer Therapien, welche eine effektive Anti-Tumorantwort induzieren, ergibt sich aus dessen heterogener Charakteristik, höchst aggressivem Wachstum und trotz Therapien hohen Rezidivraten der high-risk-Patient*innen. In den letzten Jahren konnten durch zunehmende Erkenntnisse im Bereich der Tumor- immunologie verschiedene immuntherapeutische Verfahren etabliert werden. So stellt die Anti-GD2-Therapie (ch14.18/CHO) einen zentralen klinischen Pfeiler der multimodalen Therapie des high-risk-NB dar. Hierbei werden Anti-GD2-AK verab- reicht, die das NB-spezifische Antigen GD2 erkennen, was zur gezielten Aktivierung des körpereigenen Immunsystems hauptsächlich durch NK-Zellen mit anschlie- ßender Tumorzelllyse führt. Herausforderungen ergeben sich aus der Überwindung der immuninhibitorischen Tumorumgebung sowie der Reduzierung natürlicher Regulationsmechanismen.
Vorherige Arbeiten der Arbeitsgruppe haben eine Anti-GD2-Immuntherapie abhängige Induktion des Immuncheckpoints PD-1/PD-L1 sowie der regulatorischen myeloiden CD11b+-Zellen (MRC) gezeigt. Für die vorliegende Arbeit war nun die Rolle der CD11b+ MRC von besonderem Interesse. Hierfür wurden CD11b+ Zellen in einem syngenen NB-Mausmodell mittels Anti-CD11b-AK blockiert oder durch 5-FU selektiv depletiert, was zu einem deutlich reduzierten Tumorwachstum und verbessertem Überleben führte. Zusätzlich wurde mittels RT-PCR die relative Gen- expression MRC-modulierender Gene (Arg1, CCL2, GM-CSF, IDO, IFNγ, IL-1β, IL-4, IL-6, IL-6R, IL-8, IL-10, M-CSF, M-CSFR, iNOS, TGF-β1 und VEGF-A) in der Tumormikroumgebung sowie der Milz evaluiert. Hier wurde eine Reduktion der modulierenden Gene nicht nur in der Tumormikroumgebung, sondern sogar peri- pher durch die Depletion von MRC nachgewiesen. Somit konnte eine negative Rolle der MRC beim NB bestätigt werden.
Diese Ergebnisse stellten eine Grundlage für die kombinierte Immuntherapie aus Anti-GD2-AK und MRC-Depletion dar. Eine Steigerung der antitumoralen Wirksam- keit im Vergleich zu den entsprechenden Monotherapien wurde gezeigt. Dabei wurden eine verbesserte Überlebenswahrscheinlichkeit und ein reduziertes Tumor- wachstum festgestellt. Die vorliegenden Ergebnisse liefern daher die Grundlage für einen neuartigen kombinierten Therapieansatz, um die immer noch schlechten Überlebenschancen der high-risk-Patient*innen zu verbessern.
Background
Pregnancy and the postpartum period are times when women are at increased risk for depression and mental problems. This may also negatively affect the foetus. Thus, there is a need for interventions with low-threshold access and care. Telemedicine interventions are a promising approach to address these issues. This systematic literature review examined the efficacy of telemedicine interventions for pregnant women and/or new mothers to address mental health-related outcomes. The primary objective was to analyse whether telemedicine interventions can reduce mental health problems in pregnant women and new mothers. The secondary aim was to clarify the impact of type of interventions, their frequency and their targets.
Methods
Inclusion criteria: randomized controlled trials, with participants being pregnant women and/or new mothers (with infants up to twelve months), involving telemedicine interventions of any kind (e.g. websites, apps, chats, telephone), and addressing any mental health-related outcomes like depression, postnatal depression, anxiety, stress and others. Search terms were pregnant women, new mothers, telemedicine, RCT (randomised controlled trials), mental stress as well as numerous synonyms including medical subject headings. The literature search was conducted within the databases PubMed, Cochrane Library, Web of Science and PsycINFO. Screening, inclusion of records and data extraction were performed by two researchers according to the PRISMA guidelines, using the online tool CADIMA.
Results
Forty four articles were included. A majority (62%) reported significantly improved mental health-related outcomes for participants receiving telemedicine interventions compared to control. In particular (internet-delivered) Cognitive Behavioural Therapy was successful for depression and stress, and peer support improved outcomes for postnatal depression and anxiety. Interventions with preventive approaches and interventions aimed at symptom reduction were largely successful. For the most part there was no significant improvement in the symptoms of anxiety.
Conclusion
Telemedicine interventions evaluated within RCTs were mostly successful. However, they need to be designed to specifically target a certain mental health issue because there is no one-size-fits-all approach. Further research should focus on which specific interventions are appropriate for which mental health outcomes in terms of intervention delivery modes, content, target approaches, etc. Further investigation is needed, in particular with regard to anxiety.
Background
Multimedia multi-device measurement platforms may make the assessment of prevention-related medical variables with a focus on cardiovascular outcomes more attractive and time-efficient. The aim of the studies was to evaluate the reliability (Study 1) and the measurement agreement with a cohort study (Study 2) of selected measures of such a device, the Preventiometer.
Methods
In Study 1 (N = 75), we conducted repeated measurements in two Preventiometers for four examinations (blood pressure measurement, pulse oximetry, body fat measurement, and spirometry) to analyze their agreement and derive (retest-)reliability estimates. In Study 2 (N = 150), we compared somatometry, blood pressure, pulse oximetry, body fat, and spirometry measurements in the Preventiometer with corresponding measurements used in the population-based Study of Health in Pomerania (SHIP) to evaluate measurement agreement.
Results
Intraclass correlations coefficients (ICCs) ranged from .84 to .99 for all examinations in Study 1. Whereas bias was not an issue for most examinations in Study 2, limits of agreement for most examinations were very large compared to results of similar method comparison studies.
Conclusion
We observed a high retest-reliability of the assessed clinical examinations in the Preventiometer. Some disagreements between Preventiometer and SHIP examinations can be attributed to procedural differences in the examinations. Methodological and technical improvements are recommended before using the Preventiometer in population-based research.
Tissue sections, which are widely used in research and diagnostic laboratories and have already been examined by immunohistochemistry (IHC), may subsequently provide a resource for proteomic studies, even though only small amount of protein is available. Therefore, we established a workflow for tandem mass spectrometry-based protein profiling of IHC specimens and characterized defined brain area sections. We investigated the CA1 region of the hippocampus dissected from brain slices of adult C57BL/6J mice. The workflow contains detailed information on sample preparation from brain slices, including removal of antibodies and cover matrices, dissection of region(s) of interest, protein extraction and digestion, mass spectrometry measurement, and data analysis. The Gene Ontology (GO) knowledge base was used for further annotation. Literature searches and Gene Ontology annotation of the detected proteins verify the applicability of this method for global protein profiling using formalin-fixed and embedded material and previously used IHC slides.
Background
Long periods of uninterrupted sitting, i.e., sedentary bouts, and their relationship with adverse health outcomes have moved into focus of public health recommendations. However, evidence on associations between sedentary bouts and adiposity markers is limited. Our aim was to investigate associations of the daily number of sedentary bouts with waist circumference (WC) and body mass index (BMI) in a sample of middle-aged to older adults.
Methods
In this cross-sectional study, data were collected from three different studies that took place in the area of Greifswald, Northern Germany, between 2012 and 2018. In total, 460 adults from the general population aged 40 to 75 years and without known cardiovascular disease wore tri-axial accelerometers (ActiGraph Model GT3X+, Pensacola, FL) on the hip for seven consecutive days. A wear time of ≥ 10 h on ≥ 4 days was required for analyses. WC (cm) and BMI (kg m− 2) were measured in a standardized way. Separate multilevel mixed-effects linear regression analyses were used to investigate associations of sedentary bouts (1 to 10 min, >10 to 30 min, and >30 min) with WC and BMI. Models were adjusted for potential confounders including sex, age, school education, employment, current smoking, season of data collection, and composition of accelerometer-based time use.
Results
Participants (66% females) were on average 57.1 (standard deviation, SD 8.5) years old and 36% had a school education >10 years. The mean number of sedentary bouts per day was 95.1 (SD 25.0) for 1-to-10-minute bouts, 13.3 (SD 3.4) for >10-to-30-minute bouts and 3.5 (SD 1.9) for >30-minute bouts. Mean WC was 91.1 cm (SD 12.3) and mean BMI was 26.9 kg m− 2 (SD 3.8). The daily number of 1-to-10-minute bouts was inversely associated with BMI (b = -0.027; p = 0.047) and the daily number of >30-minute bouts was positively associated with WC (b = 0.330; p = 0.001). All other associations were not statistically significant.
Conclusion
The findings provide some evidence on favourable associations of short sedentary bouts as well as unfavourable associations of long sedentary bouts with adiposity markers. Our results may contribute to a growing body of literature that can help to define public health recommendations for interrupting prolonged sedentary periods.
Trial registration
Study 1: German Clinical Trials Register (DRKS00010996); study 2: ClinicalTrials.gov (NCT02990039); study 3: ClinicalTrials.gov (NCT03539237).
Homoarginine (hArg) is a non-essential cationic amino acid which inhibits hepatic alkaline phosphatases to exert inhibitory effects on bile secretion by targeting intrahepatic biliary epithelium. We analyzed (1) the relationship between hArg and liver biomarkers in two large population-based studies and (2) the impact of hArg supplementation on liver biomarkers. We assessed the relationship between alanine transaminase (ALT), aspartate aminotransferase (AST), γ-glutamyltransferase (GGT), alkaline phosphatases (AP), albumin, total bilirubin, cholinesterase, Quick’s value, liver fat, and Model for End-stage Liver Disease (MELD) and hArg in appropriately adjusted linear regression models. We analyzed the effect of L-hArg supplemention (125 mg L-hArg daily for 4 weeks) on these liver biomarkers. We included 7638 individuals (men: 3705; premenopausal women: 1866, postmenopausal women: 2067). We found positive associations for hArg and ALT (β 0.38 µkatal/L 95% confidence interval (CI): 0.29; 0.48), AST (β 0.29 µkatal/L 95% CI 0.17; 0.41), GGT (β 0.033 µkatal/L 95% CI 0.014; 0.053), Fib-4 score (β 0.08 95% CI 0.03; 0.13), liver fat content (β 0.016% 95% CI 0.006; 0.026), albumin (β 0.030 g/L 95% CI 0.019; 0.040), and cholinesterase (β 0.003 µkatal/L 95% CI 0.002; 0.004) in males. In premenopausal women hArg was positively related with liver fat content (β 0.047% 95%CI 0.013; 0.080) and inversely with albumin (β − 0.057 g/L 95% CI − 0.073; − 0.041). In postmenopausal women hARG was positively associated with AST (β 0.26 µkatal/L 95% CI 0.11; 0.42). hArg supplementation did not affect liver biomarkers. We summarize that hArg may be a marker of liver dysfunction and should be explored further.
The establishment of a guideline for long-term noninvasive ventilation treatment (LTH-NIV) of acute hypercapnic exacerbations of chronic obstructive pulmonary disease (AECOPD) requiring acute ventilation has proven elusive. Most studies thus far have shown no mortality benefit of long-term noninvasive ventilation treatment. Using retrospective analysis of the data of our patients (n = 143) recruited from 2012 to 2019, we aimed to compare patients discharged with and without long-term noninvasive ventilation. The follow-up results showed no significant difference (p = 0.233) between the groups [LTH-NIV (n = 83); non-NIV (n = 60)] regarding readmission due to clinical worsening. However, the first- and second-year survival rates were 82% and 72%, respectively, in the LTH-NIV group and significantly different (p = 0.023) from 67 and 55% in the non-NIV group. The statistical models showed a significant mortality risk for the non-NIV group, with a hazard ratio (HR) of 2.82 (1.31; 6.03). To the best of our knowledge, this is the first study to demonstrate the mortality benefit of long-term NIV therapy for patients with AECOPD under real-world conditions.
Background
Primary muscular disorders (metabolic myopathies, including mitochondrial disorders) are a rare cause of dyspnea. We report a case of dyspnea caused by a mitochondrial disorder with a pattern of clinical findings that can be classified in the known pathologies of mitochondrial deletion syndrome.
Case presentation
The patient presented to us at 29 years of age, having had tachycardia, dyspnea, and functional impairment since childhood. She had been diagnosed with bronchial asthma and mild left ventricular hypertrophy and treated accordingly, but her symptoms had worsened. After more than 20 years of progressive physical and social limitations was a mitochondrial disease suspected in the exercise testing. We performed cardiopulmonary exercise testing (CPET) with right heart catheterization showed typical signs of mitochondrial myopathy. Genetic testing confirmed the presence of a ~ 13 kb deletion in mitochondrial DNA from the muscle. The patient was treated with dietary supplements for 1 year. In the course of time, the patient gave birth to a healthy child, which is developing normally.
Conclusion
CPET and lung function data over 5 years demonstrated stable disease. We conclude that CPET and lung function analysis should be used consistently to evaluate the cause of dyspnea and for long-term observation.
Importance: One of the biggest challenges when using anti–vascular endothelial growth factor (VEGF) agents to treat retinopathy of prematurity (ROP) is the need to perform long-term follow-up examinations to identify eyes at risk of ROP reactivation requiring retreatment.
Objective: To evaluate whether an artificial intelligence (AI)–based vascular severity score (VSS) can be used to analyze ROP regression and reactivation after anti-VEGF treatment and potentially identify eyes at risk of ROP reactivation requiring retreatment.
Design, Setting, and Participants: This prognostic study was a secondary analysis of posterior pole fundus images collected during the multicenter, double-blind, investigator-initiated Comparing Alternative Ranibizumab Dosages for Safety and Efficacy in Retinopathy of Prematurity (CARE-ROP) randomized clinical trial, which compared 2 different doses of ranibizumab (0.12 mg vs 0.20 mg) for the treatment of ROP. The CARE-ROP trial screened and enrolled infants between September 5, 2014, and July 14, 2016. A total of 1046 wide-angle fundus images obtained from 19 infants at predefined study time points were analyzed. The analyses of VSS were performed between January 20, 2021, and November 18, 2022.
Interventions: An AI-based algorithm assigned a VSS between 1 (normal) and 9 (most severe) to fundus images.
Main Outcomes and Measures: Analysis of VSS in infants with ROP over time and VSS comparisons between the 2 treatment groups (0.12 mg vs 0.20 mg of ranibizumab) and between infants who did and did not receive retreatment for ROP reactivation.
Results: Among 19 infants with ROP in the CARE-ROP randomized clinical trial, the median (range) postmenstrual age at first treatment was 36.4 (34.7-39.7) weeks; 10 infants (52.6%) were male, and 18 (94.7%) were White. The mean (SD) VSS was 6.7 (1.9) at baseline and significantly decreased to 2.7 (1.9) at week 1 (P < .001) and 2.9 (1.3) at week 4 (P < .001). The mean (SD) VSS of infants with ROP reactivation requiring retreatment was 6.5 (1.9) at the time of retreatment, which was significantly higher than the VSS at week 4 (P < .001). No significant difference was found in VSS between the 2 treatment groups, but the change in VSS between baseline and week 1 was higher for infants who later required retreatment (mean [SD], 7.8 [1.3] at baseline vs 1.7 [0.7] at week 1) vs infants who did not (mean [SD], 6.4 [1.9] at baseline vs 3.0 [2.0] at week 1). In eyes requiring retreatment, higher baseline VSS was correlated with earlier time of retreatment (Pearson r = −0.9997; P < .001).
Conclusions and Relevance: In this study, VSS decreased after ranibizumab treatment, consistent with clinical disease regression. In cases of ROP reactivation requiring retreatment, VSS increased again to values comparable with baseline values. In addition, a greater change in VSS during the first week after initial treatment was found to be associated with a higher risk of later ROP reactivation, and high baseline VSS was correlated with earlier retreatment. These findings may have implications for monitoring ROP regression and reactivation after anti-VEGF treatment.
The incidence and prevalence of pediatric-onset inflammatory bowel disease (PIBD) are on the rise worldwide. Initial symptoms are often recognized with a delay, which reduces the quality of life and may lead to an increased rate of complications. The aim of this study was to determine the diagnostic delay in PIBD and to identify potential influencing factors. Therefore, data from the German-Austrian patient registry CEDATA-GPGE for children and adolescents with PIBD were analyzed for the period January 2014 to December 2018. There were 456 children identified in the data, thereof 258 children (57%) with Crohn’s disease (CD) and 198 children (43%) with Ulcerative colitis (UC). The median age was 13.3 years (interquartile range (IQR) = 10.9−15.0), and 44% were females. The median diagnostic delay was 4.1 months (IQR = 2.1–7.0) in CD and 2.4 months (IQR = 1.2–5.1) in UC (p = 0.01). UC was associated with earlier diagnosis than CD (p < 0.001). Only a few factors influencing the diagnostic delay have been verified, e.g., abdominal pain at night and if video capsule endoscopy was performed. Diagnostic delay improved over the years in participating centers, but the level of awareness needs to be high even in common symptoms like abdominal pain.
BACKGROUND
Eosinophilic granuloma (EG) belongs to the family of Langerhans cell histiocytosis (LCH) and is considered to be a benign disease typically found in children younger than 15 years of age. Here, the authors describe an EG of unusual localization and clinical presentation.
OBSERVATIONS
The authors report a 9-year-old girl with an EG presenting as an osteolytic lesion of the clivus. After transsphenoidal resection and histological confirmation, adjuvant chemotherapy was initiated. Presenting signs and symptoms were weight loss, episodic grimacing, and moderate ballism-like movements. After a follow-up-period of 32 months, the patient presented with a total resolution of initial symptoms and no further tumor growth.
LESSONS
Although these lesions are rare, one should consider EG as a differential diagnosis when confronted with osteolytic lesions of the clivus.
Gram-negative bacteria secrete lipopolysaccharides (LPS), leading to a host immune
response of proinflammatory cytokine secretion. Those proinflammatory cytokines are
TNF-α and IFN-γ, which induce the production of indoleamine 2,3-dioxygenase (IDO). IDO production is increased during severe sepsis, and septic shock. High IDO
levels are associated with increased mortality. This enzyme catalyzes the degradation of tryptophan (TRP) to kynurenine (KYN) along the kynurenine pathway (KP).
KYN is further degraded to kynurenic acid (KYNA). Increased IDO levels accompany
with increased levels of KYNA, which is associated with immunoparalysis.
Due to its central role, the KP is a potential target of therapeutic intervention.
The degradation of TRP to KYN by IDO was intervened by 1-Methyltryptophan (1-
MT), which is assumed to inhibit IDO. By administering 1-MT, the survival of
1-MT-treated mice suffering from sepsis increased compared to mice not treated with
1-MT. The levels of downstream metabolites such as KYN and KYNA were
expected to be decreased. Surprisingly, in healthy mice and pigs, an increase in KYNA
after 1-MT administration was reported. Those unexpected metabolite alterations after 1-MT administration, and the mode of action, were not the focus of recent
research. Hence, there is no explanation for KYNA increase, while KYN did not change.
This thesis aims to postulate a possible degradation pathway of 1-MT along the KP
with the help of ordinary differential equation (ODE) systems.
Moreover, the developed ODE models were used to determine the ability of 1-MT to
inhibit IDO in vivo. Therefore, a multiplicity of ODE models were developed, including
a model of the KP, an extension by lipopolysaccharide (LPS) administration, and 1-MT
administration.
Moreover, seven ODE models were developed, all considering possible degradation pathways of 1-MT. The most likely degradation pathway was combined with the ODE model
of LPS administration, including the inhibitory effects of 1-MT.
Those models consist of several dependent equations describing the dynamics of the KP.
For each component of the KP, one equation describes the alterations over time. Equations for TRP, KYN, KYNA, and quinolinic acid (QUIN) were developed.
Moreover, the alterations of serotonin (SER) were also included. All together belong
to the TRP metabolism. They include the degradation of TRP to SER and to KYN,
which is further degraded to KYNA and QUIN. Every degradation is catalyzed by an enzyme. Therefore, Michaelis-Menten (MM) equations were used employing the substrate
constant Km and the maximal degradation velocity Vmax. To reduce the complexity of
parameter calculation, Km values of the different enzymes were fixed to literature values.
The remaining parameters of the equations were determined so that the trajectories of
the calculated metabolite levels correspond to data. The parameters of different models were determined. To propose a degradation pathway of 1-MT leading to increased
KYNA levels, seven models were developed and compared. The most likely model was
extended to test whether the inhibitory effects of 1-MT on IDO can be determined.
Three different approaches determined the ODE model parameters of the different hypothesis of 1-MT degradation. In the first approach, ODE model parameters were fixed
to values fitted to an independent data set. In the second approach, parameters were
fitted to a subset of the data set, which was used for simulations of the different hypotheses. The third approach calculated ODE model parameters 100 times without
fixed parameters. The parameter set ending up in trajectories of the TRP metabolites,
which have the smallest distance to the data, was assumed to be the most likely. The
ODE model parameters were fitted to data measured in pigs. Two different
experimental models delivered data used in this thesis. The first experimental model
activates IDO by LPS administration in pigs. The second one combines the IDO
activation by LPS with the administration of 1-MT in pigs.
The most likely hypothesis, according to approach 1 was the degradation of 1-MT to
KYNA and TRP. For the second data set the most likely one was the direct degradation of 1-MT to KYNA. With approach 2 the most likely degradation pathways were
the combination of all degradation pathways and the degradation of 1-MT to TRP and
TRP to KYNA. With approach 3 the most likely way of KYNA increase was given by
the direct degradation of 1-MT to KYNA. In summary, the three approaches revealed
hypothesis 2, the direct degradation of 1-MT to KYNA most frequently. A cell-free
assay validated this result. This experiment combined 1-MT or TRP with or without
the enzyme kynurenine aminotransferase (KAT). KAT was already shown to degrade
TRP directly to KYNA. The levels of TRP, KYN and KYNA were measured. The
highest KYNA levels were yielded with an assay adding KAT to 1-MT, corresponding
to hypothesis 2. The models describing the inhibitory effects of 1-MT revealed that
the model without inhibitory effects of 1-MT on IDO was more likely for all three approaches.
The correctness of hypothesis 2 has to be confirmed by further in vitro experiments. It
also has to be investigated which reactions promote the degradation of 1-MT to KYNA.
The missing inhibitory properties of 1-MT on IDO, determined by the in silico ODE
models, align with previous research. It was shown that the saturation of 1-MT was too
low, e.g. in pigs, to inhibit IDO efficiently.
In this study, the first possible degradation pathway of 1-MT along the KP is proposed.
The reliability of the results depends on the quality of the experimental data, and the
season, when data were measured. Moreover, the results vary between the different
approaches of parameter fitting. Different approaches of parameter fitting have to be
included in the analysis to get more evidence for the correctness of the results.
Introduction
Heart rate variability (HRV), defined as the variability of consecutive heart beats, is an important biomarker for dysregulations of the autonomic nervous system (ANS) and is associated with the development, course, and outcome of a variety of mental and physical health problems. While guidelines recommend using 5 min electrocardiograms (ECG), recent studies showed that 10 s might be sufficient for deriving vagal-mediated HRV. However, the validity and applicability of this approach for risk prediction in epidemiological studies is currently unclear to be used.
Methods
This study evaluates vagal-mediated HRV with ultra-short HRV (usHRV) based on 10 s multichannel ECG recordings of N = 4,245 and N = 2,392 participants of the Study of Health in Pomerania (SHIP) from two waves of the SHIP-TREND cohort, additionally divided into a healthy and health-impaired subgroup. Association of usHRV with HRV derived from long-term ECG recordings (polysomnography: 5 min before falling asleep [N = 1,041]; orthostatic testing: 5 min of rest before probing an orthostatic reaction [N = 1,676]) and their validity with respect to demographic variables and depressive symptoms were investigated.
Results
High correlations (r = .52–.75) were revealed between usHRV and HRV. While controlling for covariates, usHRV was the strongest predictor for HRV. Furthermore, the associations of usHRV and HRV with age, sex, obesity, and depressive symptoms were similar.
Conclusion
This study provides evidence that usHRV derived from 10 s ECG might function as a proxy of vagal-mediated HRV with similar characteristics. This allows the investigation of ANS dysregulation with ECGs that are routinely performed in epidemiological studies to identify protective and risk factors for various mental and physical health problems.
Neuroblastoma is the most common extracranial, malignant, solid tumor found in children. In more than one-third of cases, the tumor is in an advanced stage, with limited resectability. The treatment options include resection, with or without (neo-/) adjuvant therapy, and conservative therapy, the latter even with curative intent. Contrast-enhanced MRI is used for staging and therapy monitoring. Diffusion-weighted imaging (DWI) is often included. DWI allows for a calculation of the apparent diffusion coefficient (ADC) for quantitative assessment. Histological tumor characteristics can be derived from ADC maps. Monitoring the response to treatment is possible using ADC maps, with an increase in ADC values in cases of a response to therapy. Changes in the ADC value precede volume reduction. The usual criteria for determining the response to therapy can therefore be supplemented by ADC values. While these changes have been observed in neuroblastoma, early changes in the ADC value in response to therapy are less well described. In this study, we evaluated whether there is an early change in the ADC values in neuroblastoma under therapy; if this change depends on the form of therapy; and whether this change may serve as a prognostic marker. We retrospectively evaluated neuroblastoma cases treated in our institution between June 2007 and August 2014. The examinations were grouped as ‘prestaging’; ‘intermediate staging’; ‘final staging’; and ‘follow-up’. A classification of “progress”, “stable disease”, or “regress” was made. For the determination of ADC values, regions of interest were drawn along the borders of all tumor manifestations. To calculate ADC changes (∆ADC), the respective MRI of the prestaging was used as a reference point or, in the case of therapies that took place directly after previous therapies, the associated previous staging. In the follow-up examinations, the previous examination was used as a reference point. The ∆ADC were grouped into ∆ADCregress for regressive disease, ∆ADCstable for stable disease, and ∆ADC for progressive disease. In addition, examinations at 60 to 120 days from the baseline were grouped as er∆ADCregress, er∆ADCstable, and er∆ADCprogress. Any differences were tested for significance using the Mann–Whitney test (level of significance: p < 0.05). In total, 34 patients with 40 evaluable tumor manifestations and 121 diffusion-weighted MRI examinations were finally included. Twenty-seven patients had INSS stage IV neuroblastoma, and seven had INSS stage III neuroblastoma. A positive N-Myc expression was found in 11 tumor diseases, and 17 patients tested negative for N-Myc (with six cases having no information). 26 patients were assigned to the high-risk group according to INRG and eight patients to the intermediate-risk group. There was a significant difference in mean ADC values from the high-risk group compared to those from the intermediate-risk group, according to INRG. The differences between the mean ∆ADC values (absolute and percentage) according to the course of the disease were significant: between ∆ADCregress and ∆ADCstable, between ∆ADCprogress and ∆ADCstable, as well as between ∆ADCregress and ∆ADCprogress. The differences between the mean er∆ADC values (absolute and percentage) according to the course of the disease were significant: between er∆ADCregress and er∆ADCstable, as well as between er∆ADCregress and er∆ADCprogress. Forms of therapy, N-Myc status, and risk groups showed no further significant differences in mean ADC values and ∆ADC/er∆ADC. A clear connection between the ADC changes and the response to therapy could be demonstrated. This held true even within the first 120 days after the start of therapy: an increase in the ADC value corresponds to a probable response to therapy, while a decrease predicts progression. Minimal or no changes were seen in cases of stable disease.
In micro-densitometry of wood it is standard procedure to extract resin and other soluble compounds before X-ray analysis to eliminate the influence of these extractives on wood-density. Dendrochemical studies using X-ray fluorescence analysis on the other hand are commonly conducted without previous extraction. However, it is well known that translocation processes of elements during heartwood formation in trees or (temporal) differences in sap content of wood samples can influence dendrochemical element profiles. This might bias environmental signals stored in time series of element concentrations in wood proxies. We hypothesize that metals tightly bound to cell walls show a more robust proxy potential for environmental conditions than easily translocated ones. To eliminate the noise of these soluble substances in wood elemental time series, their extraction prior to analysis might be necessary. In our study we tested the effect of different solvents (water, alcohol, and acetone) and different extraction times on elemental time series of three tree species with differing wood structure (Pinus sylvestris; Quercus robur and Populus tremula). Micro-XRF analysis was conducted on nine replicates per species using an ITRAX-Multiscanner. A set of elements commonly detected in wood (S, Cl, K, Ca, Ti, Mn, Fe, and Ni) was analysed at high resolution before and after several extraction runs. Besides lowering their levels, extraction did not significantly change the temporal trends for most elements. However, for some elements, e.g., Potassium, Chlorine or Manganese, especially the water extraction led to significant decreases in concentrations and altered temporal trends. Apparently the dipole effect of water produced the strongest extraction power of all three solvents. In addition we observed a dependency of extraction intensity from wood density which differed between wood types. Our results help in interpreting and evaluating element profiles and mark a step forward in establishing dendrochemistry as a robust proxy in dendro-environmental research.
This article reports on the development, implementation and management of a German–Polish telemedicine network in the field of pediatric oncology and hematology in the Euroregion Pomerania. The achievements and challenges of joint medical case reviews involving patients and their care givers, as well as cross-border education activities for physicians, students and nursing staff, are presented. In addition to a progress report, the results of an evaluation of the participants and teachers, likewise the measurement of knowledge growth, are given.
Objective: Menopause is associated with multiple health risks. In several studies, a higher incidence or a higher risk for obstructive sleep apnea (OSA) in post-menopausal than pre-menopausal women is reported. This study was designed to verify such a connection between menopause and OSA in a population-based sample.
Methods: For a subsample (N = 1209) of the Study of Health in Pomerania (N = 4420), complete polysomnography data was available. Of these, 559 females completed a structured interview about their menstrual cycle. Splines and ordinal regression analysis were used to analyze the resulting data.
Results: In the ordinal regression analysis, a significant association between the apnea–hypopnea index (AHI) and menopause indicated that post-menopausal women had a substantially higher risk of OSA. In accordance with previous studies, risk indicators such as body mass index (BMI), age, and the influence of hysterectomies or total oophorectomies were included in the model.
Conclusions: Our results clearly confirmed the assumed connection between menopause and OSA. This is important because OSA is most often associated with male patients, and it warrants further research into the underlying mechanisms.
The iron-regulated surface determinant protein B (IsdB) of Staphylococcus aureus is involved in the acquisition of iron from hemoglobin. Moreover, IsdB elicits an adaptive immune response in mice and humans. Here, we show that IsdB also has impact on innate immunity. IsdB induces the release of proinflammatory cytokines, including IL-6 and IL-1β, in innate immune cells of humans and mice. In silico analysis and thermophoresis show that IsdB directly binds to TLR4 with high affinity. TLR4 sensing was essential for the IsdB-mediated production of IL-6, IL-1β, and other cytokines as it was abolished by blocking of TLR4-MyD88-IRAK1/4-NF-κB signaling. The release of IL-1β additionally required activation of the NLRP3 inflammasome. In human monocytes infected with live S. aureus, IsdB was necessary for maximal IL-1β release. Our studies identify S. aureus IsdB as a novel pathogen-associated molecular pattern that triggers innate immune defense mechanisms.
Background
The national Network Genomic Medicine (nNGM) Lung Cancer provides comprehensive and high-quality multiplex molecular diagnostics and standardized personalized treatment recommendation for patients with advanced non-small cell lung cancer (aNSCLC) in Germany. The primary aim of this study was to investigate the effectiveness of the nNGM precision medicine program in terms of overall survival (OS) using real-world data (RWD).
Methods
A historical nationwide cohort analysis of patients with aNSCLC and initial diagnosis between 04/2019 and 06/2020 was conducted to compare treatment and OS of patients with and without nNGM-participation. Patients participating within the nNGM (nNGM group) were selected based on a prospective nNGM database. The electronic health records (EHR) of the prospective nNGM database were case-specifically linked to claims data (AOK, German health insurance). The control group was selected from claims data of patients receiving usual care without nNGM-participation (non-nNGM group). The minimum follow-up period was six months.
Findings
Overall, n = 509 patients in the nNGM group and n = 7213 patients in the non-nNGM group met the inclusion criteria. Patients participating in the nNGM had a significantly improved OS compared to the non-nNGM group (median OS: 10.5 months vs. 8.7 months, p = 0.008, HR = 0.84, 95% CI: 0.74–0.95). The 1-year survival rates were 46.8% (nNGM) and 41.3% (non-nNGM). The use of approved tyrosine kinase inhibitors (TKI) in the first-line setting was significantly higher in the nNGM group than in the non-nNGM group (nNGM: 8.4% (43/509) vs. non-nNGM: 5.1% (366/7213), p = 0.001). Overall, patients receiving first-line TKI treatment had significantly higher 1-year OS rates than patients treated with PD-1/PD-L1 inhibitors and/or chemotherapy (67.2% vs. 40.2%, p < 0.001).
Interpretation
This is the first study to demonstrate a significant survival benefit and higher utilization of targeted therapies for aNSCLC patients participating within nNGM. Our data indicate that precision medicine programs can enhance collaborative personalized lung cancer care and promote the implementation of treatment innovations and the latest scientific knowledge into clinical routine care.
Funding
The study was funded by the AOK Federal Association Germany.
Background and aims
Prevention measures for cardiovascular diseases (CVD) have shifted their focus from lipoproteins to the immune system. However, low-grade inflammation and dyslipidemia are tightly entangled. The objective of this study was to assess the relations between a broad panel of inflammatory biomarkers and lipoprotein subclass parameters.
Methods
We utilized data from the population-based Study of Health in Pomerania (SHIP-TREND, n = 403). Plasma concentrations of 37 inflammatory markers were measured by a bead-based assay. Furthermore, we employed nuclear magnetic resonance spectroscopy to measure total cholesterol, total triglycerides, total phospholipids as well as the fractional concentrations of cholesterol, triglycerides, phospholipids, ApoA1, ApoA2 and ApoB in all major lipoprotein subclasses. Associations between inflammatory biomarkers and lipoprotein subclasses were analyzed by adjusted linear regression models.
Results
APRIL, BAFF, TWEAK, sCD30, Pentraxin-3, sTNFR1, sTNFR2, Osteocalcin, Chitinase 3-like 1, IFN-alpha2, IFN-gamma, IL-11, IL-12p40, IL-29, IL-32, IL-35, TSLP, MMP1 and MMP2 were related with lipoprotein subclass components, forming two distinct clusters. APRIL had inverse relations to HDL-C (total and subclasses) and HDL Apo-A1 and Apo-A2 content. MMP-2 was inversely related to VLDL-C (total and subclasses), IDL-C as well as LDL5/6-C and VLDL-TG, IDL-TG, total triglycerides as well as LDL5/5-TG and HDL4-TG. Additionally, we identified a cluster of cytokines linked to the Th1-immune response, which were associated with an atherogenic lipoprotein profile.
Conclusion
Our findings expand the existing knowledge of inflammation-lipoprotein interactions, many of which are suggested to be involved in the pathogeneses of chronic non-communicable diseases. The results of our study support the use of immunomodulatory substances for the treatment and possibly prevention of CVD.
Die Hospiz- und Palliativversorgung hat zum Ziel die Lebensqualität von Patient*innen mit einer unheilbaren Erkrankung zu erhalten und zu fördern. Jeder schwerkranke Mensch, der durch eine unheilbare Erkrankung eine Lebenserwartung von wenigen Tagen, Wochen oder Monaten hat, soll Zugang zur Hospiz- und Palliativversorgung erhalten. Im Rahmen der Hospiz- und Palliativversorgung werden neben der pflegerischen und medizinischen Ebene, Betroffene und deren Angehörige auf psychischer und spiritueller Ebene begleitet. Dies setzt eine gute interdisziplinäre und sektorübergreifende Zusammenarbeit voraus. Ziel der vorliegenden kumulativen Dissertation ist die Erstellung einer versorgungsepidemiologischen Analyse der Hospiz- und Palliativversorgung in Mecklenburg-Vorpommern auf Basis von Interviews, einer standardisierten schriftlichen Befragung und einer Analyse von Krankenkassendaten. Spezielles Augenmerk hat die Identifizierung von Problemen sowie Brüchen in der Kontinuität der Hospiz- und Palliativversorgung.
Die Dissertation besteht aus zwei Publikationen zur Hospiz- und Palliativversorgung in Mecklenburg-Vorpommern. In der ersten Publikation wurden mögliche Problembereiche und Barrieren in der Palliativ- und Hospizversorgung in Mecklenburg-Vorpommern anhand von qualitativen Interviews und einer darauf aufbauenden schriftlichen Befragung mit Leistungserbringer*innen der allgemeinen und spezialisierten Palliativversorgung und der Hospizversorgung ermittelt (im weiteren Verlauf der Dissertation „Befragungsstudie“ genannt). In der zweiten Publikation wurde die Kontinuität der Palliativ- und Hospizversorgung auf der Basis von Abrechnungsdaten der Krankenkasse AOK-Nordost untersucht (im weiteren Verlauf der Dissertation „Kontinuitätsstudie“ genannt).
Wichtigste Ergebnisse der qualitativen Interviews und der Befragungsstudie sind eine teilweise unzureichende Zusammenarbeit zwischen dem ambulanten und stationären Sektor sowie zwischen der allgemeinen und der spezialisierten Palliativ- und Hospizversorgung. Insbesondere die Zusammenarbeit der Hausärzt*innen mit spezialisierten palliativmedizinischen Leistungserbringer*innen wurde weniger gut bewertet. Die Bewertungen der Zusammenarbeit der einzelnen Leistungserbringer*innen deutet drauf hin, dass die Kooperation der Versorgung einer besseren Koordination bedarf. Dieses Ergebnis wurde anhand von Routinedaten im Rahmen der Kontinuitätsstudie untersucht. Die Kontinuitätsstudie zeigt, dass ein Großteil der Palliativpatient*innen nach einer palliativmedizinischen stationären Versorgung eine palliativmedizinische Anschlussversorgung erhielt, jedoch nicht immer binnen 14 Tage. Die durch die Befragungen erwarteten Versorgungslücken in Form von großen zeitlichen Abständen konnten anhand der Kontinuitätsstudie teilweise gefunden werden.
Deteriorations in slow wave sleep (SWS) have been linked to brain aging and Alzheimer’s disease (AD), possibly due to its key role in clearance of amyloid-beta and tau (Aß/tau), two pathogenic hallmarks of AD. Spermidine administration has been shown to improve sleep quality in animal models. So far, the association between spermidine levels in humans and parameters of SWS physiology are unknown but may be valuable for therapeutic strategies. Data from 216 participants (age range 50–81 years) of the population-based Study of Health in Pomerania TREND were included in our analysis. We investigated associations between spermidine plasma levels, key parameters of sleep macroarchitecture and microarchitecture that were previously associated with AD pathology, and brain health measured via a marker of structural brain atrophy (AD score). Higher spermidine levels were significantly associated with lower coupling between slow oscillations and spindle activity. No association was evident for SWS, slow oscillatory, and spindle activity throughout non-rapid eye movement sleep. Furthermore, elevated spermidine blood levels were significantly associated with a higher AD score, while sleep markers revealed no association with AD score. The association between higher spermidine levels and brain health was not mediated by coupling between slow oscillations and spindle activity. We report that higher spermidine blood levels are associated not only with deteriorated brain health but also with less advantageous markers of sleep quality in older adults. Future studies need to evaluate whether sleep, spermidine, and Aß/tau deposition are interrelated and whether sleep may play a mediating role.
Die demografischen Entwicklungen werden in den nächsten Dekaden zu einem erheblichen Anstieg älterer Bevölkerungsgruppen führen, die seltener die Empfehlungen für körperliche Aktivität der WHO erreichen. Ein hohes Ausmaß an körperlicher Inaktivität ist ein zentraler Risikofaktor für zahlreiche nicht-übertragbare Erkrankungen wie Herz-Kreislauf-Erkrankungen (HKE), die weltweit zu den häufigsten Todesursachen zählen und zudem weitreichende ökonomische Belastungen verursachen. Schlussfolgernd resultiert zukünftig ein hoher Bedarf an wirksamen Präventionsstrategien. Erfolgreiche Konzepte zur Prävention von HKE erfordern ein weitreichendes Verständnis über die Auswirkungen von körperlicher Aktivität und Inaktivität, deren Zusammenspiel sowie über relevante Einflussfaktoren.
Die vorliegende Ausarbeitung stellt die zentralen Ergebnisse von zwei Veröffentlichungen heraus. Für beide Analysen wurden Daten aus der MOVING-Studie (2016 – 2018) genutzt, die in wissenschaftlicher Kooperation mit dem Deutschen Zentrum für Herz-Kreislauf-Forschung (DZHK) Greifswald durchgeführt wurde.
Das Ziel dieser Arbeit bestand in der Untersuchung der Prävalenzen und der Determinanten von körperlicher Aktivität und körperlicher Inaktivität sowie die Analyse der Wirksamkeit einer niedrigschwelligen Intervention bei Menschen älterer Bevölkerungsgruppen. Es wurde eine Studie zur körperlichen Aktivität und Inaktivität in der Allgemeinbevölkerung durchgeführt und die Ergebnisse in zwei Publikation dargestellt.
Die erste Publikation (Prävalenz-Paper) quantifiziert das Ausmaß an körperlicher Aktivität und Inaktivität und bestimmt zudem relevante Prädiktoren. Die zweite Publikation (Effekt-Paper) analysiert weiterführend die Wirksamkeit einer niedrigschwelligen Intervention.
Zusammenfassend sind die wichtigsten Ergebnisse aus den beiden Veröffentlichungen, dass das Ausmaß an körperlicher Aktivität in der Stichprobe im Vergleich zur Allgemeinbevölkerung überdurchschnittlich hoch war. Über zwei Drittel der Studienteilnehmenden (72,8 % der Männer und 79,7 % der Frauen) erfüllten bereits zu Baseline die Empfehlungen für körperliche Aktivität für Menschen ab 65 Jahren der WHO. Insbesondere individuelle Faktoren wie Alter, Bildung und BMI haben einen signifikanten Einfluss auf körperliche Aktivität.
Unabhängig von der Prävalenz körperlicher Aktivität war auch das Ausmaß an in körperlicher Inaktivität verbrachter Zeit hoch und betrug im Mittel 68 % der Wachzeit der Probanden.
Beide Untersuchungen kamen zu dem Ergebnis, dass die Akzeptanz gegenüber dem Akzelerometer mit einer durchschnittlichen Tragezeit von etwa 14 Stunden kontinuierlich hoch war und das methodische Vorgehen damit als ein geeignetes Instrument zur Untersuchung des Forschungsfeldes angesehen werden kann.
Die Analyse der Intervention zeigt, dass der Effekt durch die Teilnahme von körperlich bereits sehr aktiven Probanden minimiert wurde, was einen Deckeneffekt vermuten lässt. Obgleich die Ergebnisse aus dem Effekt-Paper keine signifikanten Ergebnisse bezüglich des primären Outcomes liefern, geben die deskriptiven Auswertungen jedoch einen Hinweis darauf, dass die niedrigschwellige Intervention einen leichten positiven Einfluss auf das Ausmaß an körperlicher Aktivität hatte.
Die Anzahl an Richtlinien und Empfehlungen für körperliche Aktivität nahmen in der Vergangenheit kontinuierlich zu. In der Literatur herrscht weitestgehend Konsens über ein konkretes Ausmaß der zu empfehlenden körperlichen Aktivität für ältere Menschen ab 65 Jahren. Empfehlungen für körperliche Inaktivität sind bislang jedoch kaum vorhanden und enthalten keine konkreten Aussagen über Ausmaß an körperlicher Inaktivität. Bisherige Ausführungen geben eher grundsätzliche Empfehlungen für körperliche Inaktivität.
Aktuelle Veröffentlichungen der WHO beinhalten generell auch Empfehlungen zu sitzendem Verhalten. Dennoch mangelt es bislang an konkreten Empfehlungen, die über eine allgemeine Reduzierung von körperlicher Inaktivität hinausgehen und Obergrenzen definieren. Daher bedarf es insbesondere für körperliche Inaktivität weiterer Forschungsvorhaben, die vor allem die Dosis-Wirkungs-Beziehung fokussieren und im Rahmen von Empfehlungen Sitzzeiten quantifizieren.
Background and objectives
Various cross-sectional studies have observed an association between high circulating concentrations of the adipokine chemerin and an unfavorable metabolic profile. However, the prognostic value of chemerin for the risk of associated diseases and mortality was examined only in a few studies mostly using small and highly selected patient populations. We aimed to analyze the association between plasma chemerin concentrations and all-cause as well as cause-specific mortality in the general population.
Study design and methods
From the Study of Health in Pomerania (SHIP), participants of two independent cohorts (SHIP-START-1 [n = 3037], SHIP-TREND-0 [n = 4193]) were followed up for 15 and 9 years (median), respectively. The association between plasma chemerin and all-cause mortality was analyzed using multivariable Cox proportional hazard regression models. Additionally, cause-specific hazards for cardiovascular disease (CVD) and cancer mortality were modeled considering competing events.
Results
A total number of 507 and 208 deaths occurred during follow-up in SHIP-START-1 and SHIP-TREND-0, respectively. Multivariable regression analyses revealed a significant association between high plasma chemerin concentrations and greater overall mortality that was independent of major confounders. Each 30 ng/mL increase in chemerin was associated with a 17% higher risk of all-cause mortality (95%-confidence interval: 1.10–1.26). Cause-specific analyses further showed that the chemerin concentration was significantly associated with cancer mortality but not with CVD mortality.
Conclusion
The present study detected a positive association between plasma chemerin concentrations and all-cause mortality in a large population-based study sample. Cause-specific analyses have shown that chemerin is likely to play a decisive role in cancer-related deaths. However, a direct association with cardiovascular mortality could not be established.
Background
Neuroinflammation and maladaptive neuroplasticity play pivotal roles in migraine (MIG), trigeminal autonomic cephalalgias (TAC), and complex regional pain syndrome (CRPS). Notably, CRPS shares connections with calcitonin gene-related peptide (CGRP) in its pathophysiology. This study aims to assess if the documented links between CRPS and MIG/TAC in literature align with clinical phenotypes and disease progressions. This assessment may bolster the hypothesis of shared pathophysiological mechanisms.
Methods
Patients with CRPS (n = 184) and an age-/gender-matched control group with trauma but without CRPS (n = 148) participated in this case–control study. Participant answered well-established questionnaires for the definition of CRPS symptoms, any headache complaints, headache entity, and clinical management.
Results
Patients with CRPS were significantly more likely to suffer from migraine (OR: 3.23, 95% CI 1.82–5.85), TAC (OR: 8.07, 95% CI 1.33–154.79), or non-classified headaches (OR: 3.68, 95% CI 1.88–7.49) compared to the control group. Patients with MIG/TAC developed CRPS earlier in life (37.2 ± 11.1 vs 46.8 ± 13.5 years), had more often a central CRPS phenotype (60.6% vs. 37.0% overall) and were three times more likely to report allodynia compared to CRPS patients with other types of headaches. Additionally, these patients experienced higher pain levels and more severe CRPS, which intensified with an increasing number of headache days. Patients receiving monoclonal antibody treatment targeting the CGRP pathway for headaches reported positive effects on CRPS symptoms.
Conclusion
This study identified clinically relevant associations of MIG/TAC and CRPS not explained by chance. Further longitudinal investigations exploring potentially mutual pathomechanisms may improve the clinical management of both CRPS and primary headache disorders.
Trial registration
German Clinical Trials Register (DRKS00022961).
Bei spezifischen klinischen Konstellationen ist eine Lumbalpunktion zur Liquoranalytik
wichtig, um die Ätiologie der epileptischen Anfälle bzw. eines Status epilepticus zu klären und
alternative Erkrankungen auszuschließen. Die im Rahmen der vorliegenden Studie entwickelte
IDEAL-Checkliste stellt vor diesem Hintergrund einen einfach umzusetzenden und in den
klinischen Alltag leicht zu implementierenden Algorithmus dar, der behandelnde Ärztinnen
und Ärzte bei der Entscheidung für oder gegen die Durchführung einer Liquoruntersuchung
unterstützt. Gleichzeitig bewahrt die Anwendung der Checkliste Patientinnen und Patienten vor
einer nicht notwendigen Liquorpunktion mit entsprechenden Risiken. In den hier vorliegenden
Studien hätte bei etwa der Hälfte der Fälle (43 % in der prospektiven bzw. 49 % in der
retrospektiven Kohorte) auf eine Lumbalpunktion verzichtet werden können. Damit hätten die
periprozedurale Belastung der Patientinnen und Patienten sowie potentielle Komplikationen
einer Lumbalpunktion vermieden werden können.
Gleichzeitig besteht aufgrund des hohen negativen prädiktiven Wertes von 99-100 % eine hohe
Wahrscheinlichkeit eine liquorrelevante Ätiologie auch nicht zu übersehen, wenn kein Item der
kombinierten IDEAL-Checkliste zutrifft und damit auf eine Lumbalpunktion zur Liquoranalyse
verzichtet wird.
Eine multizentrische, prospektive Beobachtungsstudie sollte unter Anwendung der nationalen
und demographischen MoCA-Werte und auch im Hinblick auf unterschiedliche
Diagnostikstrategien bzw. Indikationskriterien, die breite klinische Anwendung, aber auch die
Erfassung seltener Ätiologien (z. B. immunsupprimierte Patientinnen und Patienten,
systemische Autoimmunerkrankungen) zur weiteren Validierung der IDEAL-Checkliste
erfolgen.
Introduction
In response to the COVID-19 pandemic, a general lockdown was enacted across Germany in March 2020. As a consequence, patients with mental health conditions received limited or no treatment in day hospitals and outpatient settings. To ensure continuity of care, the necessary technological preparations were made to enable the implementation of telemedical care via telephone or video conferencing, and this option was then used as much as possible. The aim of this study was to investigate the satisfaction and acceptance with telemedical care in a heterogeneous patient group of psychiatric outpatients in Germany during the first COVID-19 lockdown.
Methods
In this observational study, patients in ongoing or newly initiated outpatient psychiatric therapy as well as those who had to be discharged from the day clinic ahead of schedule received telemedical treatment via telephone. Data collection to assess the patients’ and therapists’ satisfaction with and acceptance of the telemedical care was adjusted to the treatment setting.
Results
Of 60 recruited patients, 57 could be included in the analysis. 51.6% of the patients and 52.3% of their therapists reported that the discussion of problems and needs worked just as well over the phone as in face-to-face consultations. In the subgroup of patients who were new to therapy due to being discharged from hospital early, acceptance was higher and telemedicine was rated as equally good in 87.5% of contacts. Both patients and therapists felt that telemedicine care during lockdown was an alternative for usual therapy in the outpatient clinic and that the option of telemedicine care should continue for the duration of the coronavirus pandemic.
Discussion
The results show a clear trend towards satisfaction with and acceptance of telemedicine care in a heterogeneous group of unselected psychiatric patients. Although the number of patients is small, the results indicate that the mostly positive results of telemedicine concepts in research projects can probably be transferred to real healthcare settings.
Conclusions
Telemedicine can be employed in healthcare for psychiatric patients either an alternative treatment option to maintain continuity of care or as a potential addition to regular care.
The pulse length dependence of a reactive high power impulse magnetron sputtering (HiPIMS) discharge with a tungsten cathode in an argon+oxygen gas mixture gas was investigated. The HiPIMS discharge is operated with a variable pulse length of 20–500 µs. Discharge current measurements, optical emission spectroscopy of neutral Ar, O, and W lines, and energy-resolved ion mass spectrometry are employed. A pronounced dependence of the discharge current on pulse length is noted while the initial discharge voltage is maintained constant. Energy-resolved mass spectrometry shows that the oxygen-to-tungsten (O+/W+) and the tungsten oxide-to-tungsten (WO+/W+) ion ratio decreases with pulse length due to target cleaning. Simulation results employing the SDTrimSP program show the formation of a non-stoichiometric sub-surface compound layer of oxygen which depends on the impinging ion composition and thus on the pulse length.
Mobile Apps for Sexual and Reproductive Health Education: a Systematic Review and Quality Assessment
(2023)
Purpose of Review
The aim of this study was to present the current state of research on mobile health apps for sexual and reproductive health (SRH) education. Apps were analysed based on contents (by using the World Health Organization’s SRH framework), features, intended audiences and quality of evidence (by applying the Grading of Recommendations Assessment, Development and Evaluation (GRADE) approach). Taking German sexuality education apps as an example, the rapid development in the field of SRH apps over the last 3 years has been revealed by comparing the quality of apps available in 2019 with apps from 2022.
Recent Findings
SRH apps allow health information to be disseminated quickly, at low thresholds and in a practical and cost-effective manner. Moreover, they allow for anonymous usage independently of time and place. In the absence of network coverage, offline use is also possible. Previous research focused on individual SRH aspects (e.g. human immunodeficiency virus (HIV), contraception). However, some studies were designed to cover a broader range of SRH topics, but identified only a few relevant apps.
Summary
To improve SRH, it would be helpful if the apps would be of high-quality design and be made up of relevant content. Furthermore, they should be tailored to the target group and have been tested in real-life settings. A total of 50 SRH apps with sufficiently high-quality ratings were included. The apps cover a variety of SRH topics, but they often lack field-based evaluation. The effectiveness of SRH apps has not yet been sufficiently studied in a scientific manner. Only 9 apps were deemed to be adequate for a moderate GRADE level. Despite this grading, the study nevertheless shows that there are several apps that could potentially promote SRH.
Aim
To investigate the medium-term associations of serum protein subfractions derived from proton nuclear magnetic resonance (1H-NMR) spectroscopy with periodontitis and tooth loss.
Materials and Methods
A total of 3031 participants of the cohort Study of Health in Pomerania (SHIP-TREND) were included. In addition to conventional serum testing, serum lipoprotein contents and subfractions were analysed by 1H-NMR spectroscopy. Confounder-adjusted associations of lipoprotein variables with periodontitis and the number of missing teeth variables were analysed using mixed-effects models with random intercepts for time across individuals, accounting for multiple testing.
Results
While only spurious associations between lipoprotein levels from conventional blood tests were found—that is, triglycerides were associated with mean clinical attachment level (CAL) and low-density lipoprotein cholesterol/high-density lipoprotein cholesterol (LDL-C/HDL-C) ratio with the number of missing teeth - several associations emerged from serum lipoprotein subfractions derived from 1H-NMR analysis. Specifically, elevated LDL triglycerides were associated with higher levels of mean probing depth (PD), mean CALs, and increased odds of having <20 teeth. HDL-4 cholesterol levels were inversely associated with mean PD. Systemic inflammation (C-reactive protein) might mediate the effects of LDL and HDL triglyceride contents on periodontitis severity.
Conclusions
Several associations between serum lipoprotein subfractions and periodontitis were observed. As the underlying biochemical mechanisms remain unclear, further research is needed.
Poor sleep quality or sleep deprivation may be related to decreased bone mineral density. We aimed to assess whether associations of sleep characteristics and bone turnover or strength are present in adults from the general population and whether these are independent of common risk factors such as sex, age, and obesity. A total of 1037 participants from the Study of Health in Pomerania-TREND underwent laboratory-based polysomnography and quantitative ultrasound measurements at the heel. Of these participants, 804 completed standardised questionnaires to assess daytime sleepiness, insomnia, and sleep quality. Serum concentrations of two bone turnover markers, intact amino-terminal propeptide of type 1 procollagen (P1NP) and carboxy-terminal telopeptide of type 1 collagen (CTX) were measured. Cross-sectional associations of polysomnography variables (total sleep time, sleep efficiency, time spent wake after sleep onset, oxygen desaturation index, apnea–hypopnea index, and obstructive sleep apnea [OSA]), as well as sleep questionnaire scores with the bone turnover markers and the ultrasound-based stiffness index were assessed in linear regression models. In adjusted models, higher insomnia scores and lower sleep quality scores were related to a higher bone turnover in women but not in men. However, associations between polysomnography variables or questionnaire scores and the stiffness index were absent. Our study provides limited evidence for relationships between sleep characteristics and bone turnover and strength independent of common risk factors for OSA and osteoporosis. Nevertheless, women reporting poor sleep or insomnia in combination with risk factors for osteoporosis might benefit from an evaluation of bone health.
Immunotherapies against high-risk neuroblastoma (NB), using the anti-GD2 antibody (Ab) dinutuximab beta (DB), significantly improved patient survival. Ab-dependent cellular cytotoxicity (ADCC) is one of the main mechanisms of action and it is primarily mediated by NK cells. To further improve antitumor efficacy, we investigated here a combinatorial immunotherapy with DB and the double immune checkpoint blockade of T-cell immunoreceptor with immunoglobulin and ITIM domain (TIGIT) and programmed cell death ligand-1 (PD-L1). The effects of ADCC, mediated by DB against NB cells on NK-cell activity, and the expression of TIGIT and CD226 and their ligands CD112 and CD155, as well as of PD-1 and PD-L1 on NB and effector cells, were investigated using flow cytometry. ADCC was assessed with a calcein-AM-based cytotoxicity assay. The efficacy of a combinatorial immunotherapy with DB, given as a long-term treatment, and the double immune checkpoint blockade of TIGIT and PD-L1 was shown using a resistant murine model of NB, followed by an analysis of the tumor tissue. We detected both TIGIT ligands, CD112 and CD155, on all NB cell lines analyzed. Although ADCC by DB resulted in a strong activation of NK cells leading to an effective tumor cell lysis, a remarkable induction of PD-L1 expression on NB cells, and of TIGIT and PD-1 on effector cells, especially on NK cells, was observed. Additional anti-TIGIT or anti-PD-L1 treatments effectively inhibited tumor growth and improved survival of the mice treated with DB. The superior antitumor effects were observed in the “DB + double immune checkpoint blockade” group, showing an almost complete eradication of the tumors and the highest OS, even under resistant conditions. An analysis of tumor tissue revealed both TIGIT and TIGIT ligand expression on myeloid-derived suppressor cells (MDSCs), suggesting additional mechanisms of protumoral effects in NB. Our data show that the targeting of TIGIT and PD-L1 significantly improves the antitumor efficacy of anti-GD2 immunotherapy, with DB presenting a new effective combinatorial treatment strategy against high-risk tumors.
Global and even national genome surveillance approaches do not provide the resolution necessary for rapid and accurate direct response by local public health authorities. Hence, a regional network of microbiological laboratories in collaboration with the health departments of all districts of the German federal state of Mecklenburg-Western Pomerania (M-V) was formed to investigate the regional molecular epidemiology of circulating SARS-CoV-2 lineages between 11/2020 and 03/2022. More than 4750 samples from all M-V counties were sequenced using Illumina and Nanopore technologies. Overall, 3493 (73.5%) sequences fulfilled quality criteria for time-resolved and/or spatially-resolved maximum likelihood phylogenic analyses and k-mean/ median clustering (KMC). We identified 116 different Pangolin virus lineages that can be assigned to 16 Nextstrain clades. The ten most frequently detected virus lineages belonged to B.1.1.7, AY.122, AY.43, BA.1, B.1.617.2, BA.1.1, AY.9.2, AY.4, P.1 and AY.126. Time-resolved phylogenetic analyses showed the occurrence of virus clades as determined worldwide, but with a substantial delay of one to two months. Further spatio-temporal phylogenetic analyses revealed a regional outbreak of a Gamma variant limited to western M-V counties. Finally, KMC elucidated a successive introduction of the various virus lineages into M-V, possibly triggered by vacation periods with increased (inter-) national travel activities. The COVID-19 pandemic in M-V was shaped by a combination of several SARS-CoV-2 introductions, lockdown measures, restrictive quarantine of patients and the lineage specific replication rate. Complementing global and national surveillance, regional surveillance adds value by providing a higher level of surveillance resolution tailored to local health authorities.
For the characterization of Kv7.2/3 channel activators, several analytical methods are available that vary in effort and cost. In addition to the technically elaborate patch-clamp method, which serves as a reference method, there exist several medium to high-throughput screening methods including a rubidium efflux flame-atomic absorption spectrometry (F-AAS) assay and a commercial thallium uptake fluorescence-based assay. In this study, the general suitability of a graphite furnace atomic absorption spectrometry (GF-AAS)-based rubidium efflux assay as a screening method for Kv7.2/3 channel activators was demonstrated. With flupirtine serving as a reference compound, 16 newly synthesizedcompounds and the known Kv7.2/3 activator retigabine were first classified as either active or inactive by using the GF-AAS-based rubidium (Rb) efflux assay. Then, the results were compared with a thallium (Tl) uptake fluorescence-based fluorometric imaging plate reader (FLIPR) potassium assay. Overall, 16 of 17 compounds were classified by the GF-AAS-based assay in agreement with their channel-activating properties determined by the more expensive Tl uptake, fluorescence-based assay. Thus, the performance of the GF-AAS-based Rb assay for primary drug screening of Kv7.2/3-activating compounds was clearly demonstrated, as documented by the calculated Z’-factor of the GF-AAS-based method. Moreover, method development included optimization of the coating of the microtiter plates and the washing procedure, which extended the range of this assay to poorly adherent cells such as the HEK293 cells used in this study.
Purpose
A setting-sensitive instrument for assessing Quality of Life (QoL) in Telemedicine (TM) was unavailable. To close this gap, a content-valid “add-on” measure was developed. In parallel, a brief index was derived featuring six items that summarise the main content of the multidimensional assessment. After pre- and pilot-testing, the psychometric performance of the final measures was investigated in an independent validation study.
Methods
The questionnaires were applied along with other standardised instruments of similar concepts as well as associated, yet disparate concepts for validation purposes. The sample consisted of patients with depression or heart failure, with or without TM (n = 200). Data analyses were aimed at calculating descriptive statistics and testing the psychometric performance on item, scale, and instrument level, including different types of validity and reliability.
Results
The proposed factor structure of the multidimensional Tele-QoL measure has been confirmed. Reliability coefficients for internal consistency, split-half, and test-retest reliability of the subscales and index reached sufficient values. The Tele-QoL subscales and the index demonstrated Rasch scalability. Validity of both instruments can be assumed. Evidence for discriminant construct validity was provided. Known-groups validity was indicated by respective score differences for various classes of disease severity.
Conclusion
Both measures show convincing psychometric properties. The final multidimensional Tele-QoL assessment consists of six outcome scales and two impact scales assessing (un-)intended effects of TM on QoL. In addition, the Tele-QoL index provides a short alternative for outcome assessment. The Tele-QoL measures can be used as complementary modules to existing QoL instruments capturing healthcare-related aspects of QoL from the patients’ perspective.
Background: Only approximately a third of people with depressive symptoms seek professional health care. Furthermore, people labelled as mentally ill may experience stigmatisation, which can impede help-seeking behaviour.
Aim: To examine the effects of three vignette-based interventions endorsing biopsychosocial causal beliefs and strengthening self-efficacy on help-seeking intention and behaviour, as well as the predictive values of these variables and previous treatment experience.
Method: A quasi-experimental online study utilising a fractioned factorial design was carried out. People were screened for depressive symptoms and their current treatment status. After baseline assessment, they were randomly allocated into one of 24 groups receiving a combination of interventional messages. Actual help-seeking behaviour was measured at follow-ups 3 and 6 months after baseline.
Results: Altogether, N = 1,368 participants were included in the final analyses and N = 983 provided data on their help-seeking behaviour within 3 to 6 months after the baseline assessment. The intention to seek help from a general practitioner or a mental health professional was significantly influenced by the interventions. However, help-seeking behaviour was not influenced by the interventions. On a conceptual level, biopsychosocial causal beliefs (β = 0.09–0.23) and self-efficacy to seek help (β = 0.16–0.25) predicted help-seeking intention. There was a negative interaction effect of both self-efficacy beliefs on intention and behaviour, which changed depending on depression severity. In all models, the intention was the main predictor of actual behaviour. Treatment experience predicted both help-seeking intention and behaviour.
Conclusion: Biopsychosocial causal beliefs and self-efficacy have a direct effect on help-seeking intention. Interventions should include information on how to actually seek help as a means to strengthen self-efficacy beliefs and simulate previous treatment experience. Further research is needed to investigate the respective interaction effects on intention and behaviour.
Clinical Trial Registration: https://drks.de/search/de/trial/DRKS00023557, German Clinical Trials Register: DRKS00023557. Registered 11 December 2020. World Health Organization, Universal Trial Number: U1111–1264-9954. Registered 16 February 2021.
Osteoporosis, a complex chronic disease with increasing prevalence, is characterised by reduced bone mineral density (BMD) and increased fracture risk. The high heritability of BMD suggests substantial impact of the individual genetic disposition on bone phenotypes and the development of osteoporosis. In the past years, genome-wide association studies (GWAS) identified hundreds of genetic variants associated with BMD or osteoporosis. Here, we analysed 1103 single nucleotide polymorphisms (SNPs), previously identified as associated with estimated BMD (eBMD) in the UK Biobank. We assessed whether these SNPs are related to heel stiffness index obtained by quantitative ultrasound in 5665 adult participants of the Study of Health in Pomerania (SHIP). We confirmed 45 significant associations after correction for multiple testing. Next, we analysed six selected SNPs in 631 patients evaluated for osteoporosis [rs2707518 (CPED1/WNT16), rs3779381 (WNT16), rs115242848 (LOC101927709/EN1), rs10239787 (JAZF1), rs603424 (PKD2L1) and rs6968704 (JAZF1)]. Differences in minor allele frequencies (MAF) of rs2707518 and rs3779381 between SHIP participants (higher MAF) and patients evaluated for osteoporosis (lower MAF) indicated a protective effect of the minor allele on bone integrity. In contrast, differences in MAF of rs603424 indicated a harmful effect. Co-localisation analyses indicated that the rs603424 effect may be mediated via stearoyl-CoA desaturase (SCD) expression, an enzyme highly expressed in adipose tissue with a crucial role in lipogenesis. Taken together, our results support the role of the WNT16 pathway in the regulation of bone properties and indicate a novel causal role of SCD expression in adipose tissue on bone integrity.
Although the outcome of patients with acute myeloid leukemia (AML) has
improved in the past decades, the overall survival is below 50% [1, 2] and there
is still an unmet need for the development of new therapeutic strategies. Here,
we aimed to identify functional vulnerabilities in AML and investigated the
therapeutic potential of target structures involved in proteostasis, cell polarity and
RNA-binding molecular pathways.
We determined that genetic deletion of the cell fate determinant and polarity
regulator Scribble delays AML development, however, its deletion also seems to
affect the proliferative capacity of normal hematopoietic cells, lowering its value
as a therapeutic target. In contrast, inactivation of YBX1 (a pleiotropic protein with
DNA/RNA binding capacity that excerpts post-transcriptional control on its
targets) and PSMB8/LMP7 (a catalytic subunit of the immunoproteasome multiprotein
complex that belongs to the ubiquitin-proteasome system (UPS)) inhibit
leukemic cells without influencing normal hematopoietic stem and progenitor cell
function, establishing these targets as potential novel therapeutic strategies
against AML.
Genetic deletion of YBX1 caused reduced proliferation and colony forming
capacity in leukemic cells independent of the oncogenic driver mutation and
delayed AML development in vivo. The role of Ybx1 in leukemia maintenance
was investigated using a conditional knockout model, confirming the functional
requirement of Ybx1 in AML maintenance. Mechanistically, YBX1 recruited
oncogenic transcripts to polysomes, increasing their translation. Displacement of
these transcripts from polysomes after YBX1 deletion decreased their protein
expression.
Genetic and pharmacologic inhibition of PSMB8/LMP7 decreased proliferation
and colony forming capacity selectively in KMT2A (MLL)-rearranged leukemic
cells. In vivo treatment with a PSMB8/LMP7 inhibitor delayed disease
development in KMT2A-rearranged leukemic mice or patient derived xenografts
(PDX). We identified the transcriptional corepressor BASP1 as a functional
effector of the immunoproteasome. BASP1 was enriched after PSMB8/LMP7
inhibition and it was found binding to KMT2A-target genes. Moreover,
pharmacologic inhibition of PSMB8/LMP7 led to decreased expression of bonafide
KMT2A-fusion target genes and enrichment for genes deregulated by
inhibitors of the KMT2A complex partners DOT1L and MEN1. This prompted us
to investigate a potential synergism between MEN1 inhibition and
immunoproteasome inhibition. Combination treatment in AML cells revealed
decreased proliferation in vitro and increased survival in vivo as compared to the
single treatments, demonstrating the therapeutic potential of combining
immunoproteasome and MEN1 inhibitors.
Hintergrund: Die Intima-Media-Dicke der A. carotis communis (cIMT) ist als Biomarker für asymptomatische Atherosklerose bekannt und mit sowohl Gesamt- aus auch kardiovaskulärer (CV) Mortalität assoziiert. Eine größere cIMT wird von einem kompensatorischen Anstieg des Lumendurchmessers der Aa. carotides communes (LD) begleitet. Es ist nicht geklärt, welcher der beiden Parameter mehr Informationen zur Mortalität liefert.
Methoden und Ergebnisse: Es wurden 2.751 Studienteilnehmer eingeschlossen (Alter: Median 53 Jahre, 52% weiblich). In der Nachverfolgungszeit im Median von 14,9 Jahren (12,8 – 16,5 Jahre) starben 506 Teilnehmer. In einer Ausgangsuntersuchung wurden cIMT und LD mittels Ultraschalluntersuchung vermessen. Mithilfe multivariabler Cox-Regressionsmodelle wurden cIMT, LD, LD adjustiert auf cIMT (LD + cIMT) und das LD/cIMT-Verhältnis mit CV-Morta-lität und Nicht-CV-Mortalität verglichen. Die Modelle wurden mittels Akaike-Informationskri-terium (AIC) eingestuft. Die Vorhersagekraft der Modelle zur Mortalität wurde mit Harrell’s-C-Statistik verglichen.
Ein Anstieg des LD um einen Millimeter war mit einer größeren Gesamt-Mortalität assoziiert (HR 1,29; 95%-Konfidenzintervall [KI] 1,14 – 1,45; p < 0,01) und blieb nach Adjustierung auf cIMT signifikant (HR: 1,26; 95%-KI: 1,11 – 1,42; p < 0,01). Ein gleicher Anstieg der cIMT war mit einem erhöhten Risiko für Gesamtmortalität verbunden (HR: 1,73; 95%-KI: 1,09 – 2,75). Das LD/cIMT-Verhältnis und die Gesamtmortalität waren nicht assoziiert. Der LD zeigte bezüglich Gesamtmortalität das niedrigste AIC und verbesserte deren Vorhersage im Vergleich mit dem Null-Modell (p = 0,01). Verglichen mit dem LD lieferte die cIMT eine schwächere Vorhersagekraft der Gesamtmortalität.
Schlussfolgerung: In dieser großen populationsbasierten Studie liefert der LD mehr Informationen zur Gesamtmortalität als die cIMT.
Ziel der vorliegenden Arbeit war es funktionsanalytische Untersuchungsergebnisse aus der Perimetrie mit den Daten der HRT II Papillenanalyse, also den rein morphologischen Untersuchungsergebnissen, bei Glaukompatienten vergleichend zu analysieren.
Patienten und Methodik: Dieser Untersuchung liegen Laser-Scanning-Tomografien des Sehnervenkopfes mittels HRT II und Gesichtsfeldanalysen von 184 Glaukom-Patientinnen und Patienten der Klinik und Poliklinik für Augenheilkunde der Universitätsmedizin Greifswald aus dem Zeitraum von 2004 bis 2011 zugrunde. Die Laser-Scanning-Tomografien wurden mit dem HRT II erstellt. Die Gesichtsfeldanalysen wurden mit dem Octopus 101 der Fa. Haag-Streit Interzeag durchgeführt. Die Daten von 110 Frauen und 74 Männern fanden in der statistischen Auswertung Berücksichtigung. Das durchschnittliche Patientenalter betrug 55 Lebensjahre. Es standen 1.384 Datensätze zur Verfügung, die sich auf drei statistische Analysestrategien verteilten. Die Analysestrategie 1 umfasste ausschließlich die Laser-Scanning-Tomografien mit dem HRTII, die Analysestrategie 2 ausschließlich perimetrische Untersuchungsereignisse und die Analysestrategie 3 papillenmorphologische und perimet-rische Untersuchungen.
Ergebnisse: Die statistische Betrachtung der Analysestrategie 1 erbrachte keine ausreichende Signifikanz hinsichtlich der Primärparameter Patientenalter, Augenseite und Geschlecht (allein der HRT-Parameter mittlere retinale Nervenfaserschichtdicke zeigte eine Unterscheid-barkeit zwischen den Geschlechtern) ebenso wie die isolierte statistische Betrachtung der Gesichtsfeldbefunde in der Analysestrategie 2 bezüglich der Perimetriehauptparameter MD und MS im Hinblick auf die Untersuchungsstrategien (TOP und Dynamisch). Für den Vergleich beider Untersuchungsverfahren in der Analysestrategie 3 konnte der Gesichtsfeldbefund in Bezug auf die Parameter MD und MS betrachtet werden. Diese wurden hinsichtlich der fünf Hauptparameter aus den HRT Untersuchungen, der Randsaumfläche, dem Randsaumvolumen, der Exkavationsform, der Höhenprofilkontur und der mittleren retinalen Nervenfaserschichtstärke, analysiert. Pathologische Werte der mittleren Defekttiefe (MD GF-Hauptparameter) konnten mit einer signifikanten Verringerung der Randsaumfläche und einer signifikanten Abnahme des Randsaumvolumens assoziiert werden. Ebenfalls korrelierten pathologische MD-Werte mit einer Größenzunahme der Exkavationsform.
Der HRT-Hauptparameter Höhenvariation der Kontur wies keine signifikante Verminderung in Bezug auf die im Gesichtsfeld pathologisch identifizierten MD-Werte auf. Eine signifikante Reduktion hingegen zeigte die mittlere retinale Nervenfaserschichtdicke.
Die Differenzierung des Gesichtsfeldhauptparameters MD in Bezug auf das HRT-Qualitätskriterium SD zeigte, dass die Untersuchungsergebnisse mit einer SD > 40 µm im Vergleich der pathologischen zu glaukomunauffälligen Werten eine größere Varianz aufwiesen als jene, die dem Qualitätskriterium (SD < 40 µm) entsprachen.
Die Betrachtung des Qualitätsmaßes der Gesichtsfeldprüfung mit Beantwortung „falsch-negativer“ und „falsch-positiver“ Fangfragen ergab hinsichtlich der Differenzierung des HRT-Hauptparameters mittlere Nervenfaserschichtdicke, dass die pathologischen Werte einer größeren Schwankungsbreite unterlagen als die glaukomunauffälligen und somit als unzuverlässigere Untersuchungen einzuschätzen sind, wenn krankhafte morphologische Veränderungen vorliegen. Die Untersuchung der Arbeitshypothese zum Zusammenhang zwischen Gesichtsfeldverlust (MD) und den HRT-Hauptparametern auf eine vermutete Altersabhängigkeit, konnte keine deutliche Korrelation objektivieren.
Schlußfolgerung: Nur unter Berücksichtigung der äußerst vielfältigen anatomischen Gegebenheiten, z. B. Bulbuslänge, Makropapille, Pathologien, zunehmende Katarakt und Einhaltung der Qualitätsstandards, kann die Laser-Scanning-Tomografie ein sehr wichtiges diagnostisches Mittel zur Glaukomdetektion bzw. zum Glaukommonitoring in Kombination mit funktionsanalytischen perimetrischen Untersuchungen sein.
Im Ergebnis war festzustellen, dass sich die Sensitivität der HRT Parameter als nicht besonders effektiv bewerten ließen. Die statistische Auswertung der Parameter zeigte keine signifikanten Änderungen hinsichtlich der Morphologie der Papilla nervi optici über den im Zeitraum 2004 bis 2011 an der Universitätsmedizin Greifswald untersuchten Glaukompatienten im Längsschnittverlauf.
The microbiome of the colon is characterized by its great diversity. This varies not only intra- but also interindividually and is influenced by endogenous and exogenous factors, such as dietary and lifestyle factors. The aim of this work was to investigate the extent to which the degradation of the drug sulfasalazine is influenced by different microbiota. Therefore, the in vitro model MimiCol3 was used, which represents the physiological conditions of the ascending colon. In addition to a representative physiological volume, the pH value, redox potential and an anaerobic atmosphere are important to provide the bacteria with the best possible growth conditions. Stool samples were taken from three healthy subjects, comparing omnivorous, vegetarian and meat-rich diets, and cultured for 24 h. However, the nutrient medium used for cultivation led to the alignment of the bacterial composition of the microbiota. The previously observed differences between the diets could not be maintained. Nevertheless, the similar degradation of sulfasalazine was observed in all microbiota studied in MimiCol3. This makes MimiCol3 a suitable in vitro model for metabolism studies in the gut microbiome.
Because of the importance of gastric emptying for pharmacokinetics, numerous methods have been developed for its determination. One of the methods is the salivary tracer technique, which utilizes an ice capsule containing caffeine as a salivary tracer. Despite the ice capsule’s advantage in labeling ingested fluids with caffeine for subsequent salivary detection, its risk of premature melting before swallowing, and its complicated storage and preparation, limit its application, particularly in special populations (e.g., older people). For this reason, here, a compression-coated tablet was developed and validated against the ice capsule in a cross-over clinical trial. The two dosage forms were administered simultaneously to 12 volunteers in an upright position under fasted and fed state conditions. To distinguish the caffeine concentrations in saliva from each dosage form, regular type of caffeine (12C) was added to the tablet, while for the ice capsule 13C3 labelled caffeine was used. The salivary caffeine concentrations showed no statistically significant differences for the pharmacokinetic parameters tmax and AUC0→60 (p > 0.05). Thus, the new formulation is a useful tool for determining gastric emptying that can also be used in special populations.
Development of Test Programs for the Biorelevant Characterization of Esophageal-Applied Dosage Forms
(2023)
In the local treatment of the esophageal mucosa, the retention time of the different dosage forms, such as tablets, films or liquids, is of high relevance for the effective treatment of diseases. Unfortunately, there are only few in vitro models describing the esophageal route of administration. To predict the behaviour of an esophageal-applied dosage form, it is necessary to simulate the site of application in a biorelevant way. The aim of this work was to develop two test setups for an esophageal peristalsis model which was described in a previous study. Different parameters such as flow rate, peristalsis, angle of inclination or mucous membrane were varied or introduced into the model. A stimulated and unstimulated modus were developed and tested with two different dosage forms. The time until the dosage form was cleared from the in vitro model was shorter with the stimulated than with the unstimulated modus. Also, esophageal-applied films had a prolonged transit time compared to a viscous syrup. The modification of the simulated esophageal surface made it possible to estimate the retention time of the dosage forms. It could be demonstrated that the residence time of a dosage form depends on different parameters affecting each other.
Task shielding is an important executive control demand in dual-task performance enabling the segregation of stimulus–response translation processes in each task to minimize between-task interference. Although neuroimaging studies have shown activity in left dorsolateral prefrontal cortex (dlPFC) during various multitasking performances, the specific role of dlPFC in task shielding, and whether non-invasive brain stimulation (NIBS) may facilitate task shielding remains unclear. We therefore applied a single-blind, crossover sham-controlled design in which 34 participants performed a dual-task experiment with either anodal transcranial direct current stimulation (atDCS, 1 mA, 20 min) or sham tDCS (1 mA, 30 s) over left dlPFC. Task shielding was assessed by the backward-crosstalk effect, indicating the extent of between-task interference in dual tasks. Between-task interference was largest at high temporal overlap between tasks, i.e., at short stimulus onset asynchrony (SOA). Most importantly, in these conditions of highest multitasking demands, atDCS compared to sham stimulation significantly reduced between-task interference in error rates. These findings extend previous neuroimaging evidence and support modulation of successful task shielding through a conventional tDCS setup with anodal electrode over the left dlPFC. Moreover, our results demonstrate that NIBS can improve shielding of the prioritized task processing, especially in conditions of highest vulnerability to between-task interference.
Background & Aim: Person-Centered-Care (PCC) requires knowledge about patient preferences. Among People living with Dementia (PlwD) only limited evidence about patient preferences, more specifically quantitative preferences, is available. Additionally, data on congruence of patient preferences with physicians’ judgements are missing. Information on patient preferences and their congruence with physicians’ judgements is expected to support Shared Decision-Making and respectively support the implementation of PCC in dementia. The aim of this dissertation was to analyze patient preferences and physicians’ judgements for PCC, including an assessment of their congruence, based on data from the mixed-methods PreDemCare-study. (Funding: Doctoral Scholarship from the Hans & Ilse Breuer-Stiftung.)
Methods: Development and conduct of a cross-sectional Analytic Hierarchy Process (AHP) survey with n=50 PlwD and n=25 physicians. Individual AHP-weights were calculated with the principal right eigenvector method and aggregated per group by Aggregation of Individual Priorities (AIP) mode. Individual consistency ratios (CRs) were calculated and aggregated per group. Group differences were analyzed descriptively by AIP-derived means and standard deviations of AHP-weights, resulting ranks, and boxplots. Additionally, differences between groups were investigated with independent paired t-tests or Mann Whitney-U tests. The sensitivity of AHP-results at the level of criteria was tested by an exclusion of inconsistent respondents in both groups, with an accepted threshold of the individual CR at ≤ 0.3 for PlwD and ≤ 0.2 for physicians.
Results: Contrary to expectation, PlwD’s and physician’s ranking of AHP-elements did not differ meaningfully. Memory Exercises was the only AHP-criterion, for which a significant difference in AHP-weights could be identified (p-value = 0.01). After inconsistent participants had been excluded, no rank reversals occurred. At the level of criteria, the mean CR for PlwD was 0.261 and 0.181 for physicians, id est (i.e.) below the
defined threshold.
Conclusion: In the selected study setting of the PreDemCare-study, patient preferences and physicians’ judgements for elements of PCC in dementia aligned well, contrary to expectations. Subject to restrictions by small sample sizes, the findings may form a basis to guide the implementation of preference-based, person-centered dementia care.
Innovative Wirkstoffe stellen die Entwickler und Entwicklerinnen von pharmazeutischen Darreichungsformen vor große Herausforderungen. Viele neue Arzneistoffe weisen eine unzureichende orale Bioverfügbarkeit auf. Die Gründe hierfür sind vielfältig und liegen unter anderem in der ortsabhängigen Löslichkeit und Permeabilität der betreffenden Substanzen. Dieser Problematik kann auf chemischer und technologischer Ebene begegnet werden. Auf der Seite der pharmazeutischen Technologie besteht beispielsweise die Möglichkeit, mukoadhäsive Darreichungsformen zu entwickeln. Darunter versteht man Systeme, die an der Schleimhaut haften und dadurch eine Retention des Arzneistoffes an der entsprechenden Stelle bewirken. Einerseits führt dies zu einer lokalen Erhöhung der Wirkstoffkonzentration, andererseits wird durch die Adhäsion die potenzielle Resorptionszeit verlängert. Beide Faktoren können sich positiv auf die Bioverfügbarkeit auswirken.
Zur Charakterisierung mukoadhäsiver Arzneiformen sind verschiedene Methoden beschrieben worden, von denen jedoch keine standardisiert ist. Mögliche Einflussfaktoren auf die Messung wurden in der Vergangenheit teilweise nicht ausreichend evaluiert, was die Konzeption einer geeigneten Messmethode erschwert. In der vorliegenden Arbeit wurde systematisch eine Methode zur Messung der Adhäsivität von Polyvinylalkohol-Filmen auf Basis der Messung der maximalen Haftkraft erarbeitet. Dazu wurde im ersten Teil der Arbeit ein in vitro-Test durchgeführt, der zur Aufklärung gerätespezifischer Einflussfaktoren diente. Es zeigte sich, dass die Adhäsion von PVA-Filmen an biomimetischen Agar/Muzin-Gelen in erster Linie zeitabhängig ist. Das Maximum der Adhäsion konnte nach 3 min beobachtet werden. In dieser Zeit kommt es zu einer Quellung des zuvor festen Films, wodurch die Beweglichkeit der Polymerketten zunimmt. Dies kann die Vernetzung von Polymer und Muzin begünstigen, wodurch die Adhäsion zunimmt. Nach Überschreiten eines Maximums kommt es zu einer Überhydratisierung des Systems und zu einer Abnahme der Kohäsion, so dass der Gelfilm beim Entfernen der Messsonde in sich reißt.
Die Geschwindigkeit, mit der die Sonde entfernt wurde, beeinflusste ebenfalls die Ergebnisse der Untersuchungen. Höhere Geschwindigkeiten führten zu höheren berechneten Adhäsionsarbeiten Wad, während die maximale Abrisskraft Fmax ein Plateau erreichte. Dieses Verhalten könnte durch die viskoelastischen Eigenschaften der beteiligten Bindungspartner beeinflusst werden.
Bezüglich der gerätespezifischen Parameter schien die Anpresskraft des Mukoadhäsivs an das biomimetische Gel den geringsten Effekt auszuüben. Unter Berücksichtigung der verwendeten Kraftmesszelle und der Integrität des Gels sollten höhere Anpresskräfte verwendet werden. Je nach Applikationsort sind physiologische Drücke zu berücksichtigen.
Ausgehend von den in vitro gewonnenen Erkenntnissen wurden anschließend zwei ex vivo Versuche durchgeführt. Diese Versuche konzentrierten sich auf die Eigenschaften der Substrate selbst, auf denen die PVA-Filme haften sollten. Der Einfluss der Präparation der verwendeten Gewebe auf die Adhäsion wurde sowohl an Dünndarmpräparaten vom Schwein als auch am Menschen untersucht. Die Gewebe wurden zum einen im frischen Zustand unmittelbar nach der Entnahme für die Mukoadhäsionsmessungen verwendet, im zweiten Versuchsabschnitt wurden sie für eine Woche im Gefrierschrank gelagert und für die Experimente aufgetaut. Bei den Schweinedärmen stellte sich die Frage, ob die Reinigung der frischen Därme einen zusätzlichen Effekt haben könnte. Aufgrund der geringen Probenzahl konnte kein eindeutiger Trend festgestellt werden. Bei zwei von drei Versuchstieren erhöhte sich die errechnete Arbeit (Wad) durch die vorsichtige Reinigung. Beim Auftauen der gereinigten Gewebe konnte bei allen Versuchstieren ein Anstieg der Wad sowie der maximalen Abrisskraft beobachtet werden. Diese Daten wurden statistisch mit den Ergebnissen der ex vivo-Humanstudie verglichen. Das Probandenkollektiv, dessen Daten in die Untersuchungen einflossen, umfasste insgesamt 12 Teilnehmer, die sich aufgrund verschiedener gastrointestinaler Erkrankungen einer geplanten Operation unterziehen mussten. Gesundes Dünndarmgewebe, das aus operationstechnischen Gründen zusätzlich zum erkrankten Gewebe entfernt werden musste, wurde im Rahmen der Studie verwendet. Der statistische Vergleich der Gewebe unterschiedlicher Herkunft zeigte sowohl im frischen als auch im aufgetauten Zustand keine signifikanten Unterschiede. Bei Betrachtung der einzelnen Messwerte konnte jedoch festgestellt werden, dass die berechneten Wad bei menschlichem Gewebe etwas höher lagen als bei Schweinepräparaten. Eine größere Probenzahl könnte einen möglichen statistisch signifikanten Unterschied aufzeigen. Bei menschlichem Gewebe konnte außerdem festgestellt werden, dass die Verwendung einer Messeinstellung mit höherer Anpresskraft, längerer Kontaktzeit und schnellerem Entfernen der Messsonde zu signifikant höheren Wad führte (Einstellung A vs. Einstellung B). Bei allen Messungen wurde deutlich, dass die Adhäsionsarbeit empfindlicher auf Änderungen der Messparameter reagiert und daher möglicherweise der geeignetere Surrogatparameter für die Quantifizierung der Mukoadhäsion ist. Insgesamt zeigte sich bei den biologischen Präparaten eine deutlich größere Variabilität der Messwerte als bei den in vitro-Versuchen. Bei dem humanen Gewebe der ex vivo-Studie handelte es sich um Gewebe, welches von der für den Eingriff ursächlichen Erkrankung nicht betroffen war. In diesem Zusammenhang ist die große interindividuelle Variabilität der Messwerte auf der gesunden Schleimhaut hervorzuheben. Bei der Anwendung mukoadhäsiver Filme auf histologisch veränderter, pathogener Schleimhaut könnte die Mukoadhäsion möglichweise sogar weitaus variabler sein, da in diesem Fall neben der histologischen Veränderung auch eine mögliche Begleitmedikation eine Rolle spielen könnte. Diese Aspekte sollten bei dem Design einer Darreichungsform, aber auch eines geeigneten Testsystems zukünftig berücksichtigt werden.
Die in dieser Arbeit gewonnenen Erkenntnisse können zur weiteren Optimierung und Validierung einer Messmethode für die Mukoadhäsion beitragen, um die Genauigkeit und Zuverlässigkeit der Ergebnisse zu erhöhen. Um die biologische Relevanz dieser in vitro-Experimente zu verbessern, können physiologische Daten aus telemetrischen Systemen genutzt und in den experimentellen Aufbau implementiert werden.
Agglomerate Sprühgetrockneter Amorpher Fester Dispersionen (Englisch: Spray-dried Amorphous Solid Dispersions – SD-ASD) im Gastrointestinaltrakt können zu Beeinträchtigungen des Wohlergehens von Nagetieren in präklinischen Studien im Rahmen der Arzneimittelentwicklung führen. Das Auftreten solcher Agglomerate, nachfolgend Pharmakobezoare genannt, war dabei auf Studien an Nagetieren beschränkt bei welchen Hydroxypropylmethylcelluloseacetatsuccinat (HPMC-AS) als Trägerpolymer der als Suspension applizierten SD-ASDs eingesetzt wurde. In diesem Promotionsprojekt evaluierten wir basierend auf Berichten präklinischer Studien Faktoren, welche die Pharmakobezoarbildung in vivo beeinflussen. Weiterhin wurde ein In vitro-Modell entwickelt, mittels welchem das Agglomerationspotential verschiedener SD-ASDs vor Applikation untersucht werden konnte. Dieses Modell wurde ebenfalls genutzt um einen Ansatz zur Reduktion des Agglomerationspotentials zu finden, welcher in der letzten Phase des Promotionsprojektes in vivo verifiziert wurde. Dabei wurde der Effekt der Viskositätserhöhung der Suspensionen zur Reduktion der Pharmakobezoarbildung nicht nur anhand der Masse der bei Sektion gefundenen Pharmakobezoare bewertet, sondern auch die Inzidenz von Pharmakobezoaren an verschiedenen Zeitpunkten der 24-tägigen Studie auf Basis kontinuierlich durchgeführter MRT-Messungen verglichen. Die Visualisierung der intragastralen Pharmakobezoarbildung in vivo ermöglichte darüber hinaus ein detailliertes Verständnis des Prozesses der Pharmakobezoarbildung in Nagetieren unter Berücksichtigung anatomischer und physiologischer Faktoren.
Zusammenfassung
Die chronische Pankreatitis ist eine durch wiederkehrende Entzündungsschübe gekennzeichnete Erkrankung des Pankreas, die meist mit einem ausgeprägten Verlust der endokrinen und exokrinen Organfunktion verbunden ist. Der Übergang einer akut rekurrierenden in eine chronische Form ist meist fließend.
Trotz der prinzipiell unbekannten Ätiologie sind mit Mutationen in u.a. dem SPINK1- und CFTR- Gen bereits genetische Risikofaktoren für die Entstehung einer idiopathischen Pankreatitis beschrieben. Für die bisher am umfangreichsten untersuchte Leu26Val-Mutation im CTSB existieren unterschiedliche Konklusionen in indischen und europäischen Arbeitsgruppen.
Im Rahmen dieser Arbeit wurden zwei Patientenkohorten auf Sequenzvarianten im Bereich des Promotors, der 5’UTR und des Translationsstartes des CTSB als Risikofaktoren für die idiopathische Pankreatitis und deren möglicher Einfluss auf die Entstehung von Spleißvarianten und die Genexpression untersucht und mit lokalen Blutspendern sowie der europäischen Kontrollkohorte des 1000-Genome-Projektes verglichen. Hierfür wurden 278 Patienten mit einer idiopathisch chronischen und 83 Patienten mit einer idiopathisch akut rekurrierenden Pankreatitis mittels bidirektionaler Sanger-Sequenzierung und Taqman-Assays genotypisiert.
Besonders hervorzuhebende SNP sind die beiden Missense-Varianten c.76C>G (Leu26Val) und c.157A>G (Ser53Gly) sowie der zwar nur bei einem Patienten detektierte, aber direkt innerhalb der Exon-/Intron-Grenze lokalisierte c.-100+1G>A. Die Varianten c.76C>G und c.157A>G zeigten bei Pankreatitis-Patienten eine signifikant geringere Prävalenz als bei den Kontrollen. Für weitere Varianten fanden sich keine signifikanten Assoziationen mit der idiopathischen Pankreatitis.
Bei der Haplotypenanalyse kam der Haplotyp TCGCG mit den mutierten Allelen der beiden Missense-Mutationen ebenfalls bei Pankreatitis-Patienten signifikant seltener als bei den Kontrollen vor.
Im zweiten Teil der Arbeit wurde die Grundlage für die Untersuchung der Assoziation zwischen unterschiedlichen Transkriptionsstartpunkten im Promotorbereich des CTSB-Gens und der Genexpression geschaffen. Hierfür wurden Reportergenkonstrukte aus dem pEGFP1-Vektor, SV40-Promotor und den Spleißvarianten 1, 2 und 4 des CTSB in HEK293- und PatuT-Zellen stabil transfiziert und die Genexpression mittels Fluoreszenzmikroskopie gezeigt.
Anhand dieser Arbeit erscheinen Sequenzvarianten im CTSB zwar weiterhin möglich, wenn auch unwahrscheinlich als Risikofaktoren für die idiopathische Pankreatitis. Anhand der erstellten Reportergenkonstrukte kann der Hypothese zur unterschiedlichen Aktivität des CTSB in pankreatischem Gewebe, hervorgerufen durch verschiedene Spleißvarianten des Gens, weiter nachgegangen werden.
Liver dysfunctions are commonly associated with diabetes and mortality in the general
population. However, previous studies lack to define these disorders with hepatic markers from
MRI, which have been shown to be more accurate and sensitive than hepatic ultrasound and
laboratory markers. Further, previous studies defining different categories of prediabetes by oral
glucose tolerance states revealed controversial findings. Hence, this dissertation contributed to
understand the associations of liver dysfunctions with glucose intolerance states and all-cause
mortality in the general population.
In the first part of the dissertation, the associations of MRI-related hepatic steatosis and hepatic
iron overload with prediabetes were investigated. Prediabetes was categorized into IFG, IGT,
(alone or in combination) or previously unknown type 2 diabetes mellitus using OGGT data, as
suggested by the ADA. For analyses, we included 1632 subjects with MRI who participated in
an OGTT and reported no type 2 diabetes mellitus. We found that hepatic steatosis was
positively associated with continuous markers of glucose metabolism. Similarly, subjects with
hepatic steatosis as defined by MRI had a higher relative risk ratio to be in the prediabetes
groups (i-IFG, i-IGT and IFG + IGT) or having undiagnosed diabetes than individuals without
this condition. The observed associations were more obvious for MRI-derived hepatic steatosis
compared to ultrasound. In comparison to hepatic steatosis, we found that MRI-assessed hepatic
iron overload was positively associated only with both 2-hour plasma glucose and the combined
IFG + IGT category. There were no significant associations between hepatic iron overload and
other glucose tolerance states or biomarkers of glucose metabolism, regardless of possible
confounding factors.
In the second part, the associations of liver volume and other markers of hepatic steatosis with
all-cause mortality in the general population were investigated. We included 2769 middle-aged
German subjects with a median follow-up of 8.9 years (23,898 person-years). Serum liver
enzymes and FIB-4 score were used as quantitative markers, while MRI measurements of liver
fat content and total liver volume included as qualitative markers of hepatic steatosis. Compared
to other markers of hepatic steatosis, larger liver volumes were significantly associated with a
nearly three-fold increase in the long-term risk of all-cause mortality. Furthermore, this
association was consistent across all subgroups considered (men vs. women; presence or absence
of metabolic syndrome or type 2 diabetes at baseline). A positive association between FIB-4
score and all-cause mortality was found both in the entire cohort and in women. Likewise,
positive associations of higher serum AST and GGT levels with all-cause mortality were found
in the entire cohort and in men.
To conclude, this dissertation acknowledges the fact that prevention and early intervention of
liver dysfunction has major impact to reduce the burden of public health problems. Thus, our
findings suggest that hepatic markers contributes to an increased risk of prediabetes and all-cause
mortality, which might be helpful to identify high risk groups who need closer attention with
respect to prevention of liver disorders and diabetes.
Objective
Alexithymia is associated with various mental and physical disorders. Some rare evidence also suggested high alexithymia to affect the HPA axis based on small and selective samples. It was aimed to investigate the impact of alexithymia on basal cortisol levels in a large population-based cohort.
Methods
In a sample of N = 3444 individuals from the Study of Health in Pomerania (SHIP-TREND-0), the effect of alexithymia on basal serum cortisol levels was investigated in a cross-sectional design.
Multiple linear regressions utilizing cortisol levels as the response variable and alexithymia as the predictor of interest were calculated, while adjusting for conven-tional confounding covariates including depression. Multiple stratified, moderation and mediation analyses were performed to validate the results.
Results
Alexithymia was not significantly associated with basal cortisol levels (b = 0.23, 95 percent confidence interval (CI) of [-0.24, 0.69]; sr2 = 0.00, CI: [-0.00, 0.00]).
Sex- and age-stratified regression analyses as well as dichotomized models of non-alexithymic and alexithymic individuals substantiated the non-significance.
Additional mediation analyses with (1) depression and (2) physical health (R2 > 1 in both cases) and moderation analysis regarding the interaction of physical health and alexithymia (b = -1.45, 95 percent confidence interval (CI) of [-6.13, 3.32]; sr2 = 0.00, CI: [-0.00, 0.00]) corroborated the results.
Conclusion
This study does not support previous findings as it shows no association between alexithymia and basal cortisol; however, a consideration of the circadian rhythm, stress exposure or specific sample compositions heeding the methodological design should be the subject of further research.
Background. The German maternity guidelines require regular medical checkup (MC) during pregnancy as a measure of prevention. Socioeconomic factors such as education, profession, income and origin, but also age and parity may influence the preventive and health behavior of pregnant women. The aim was to investigate the influence of these factors on the participation rate in MC of pregnant women. Method. The current analysis is based on the prospective population-based birth cohort study Survey of Neonates in Pomerania, which was conducted in Western Pomerania, Germany. The data of 4092 pregnant women from 2004 to 2008 were analyzed regarding the antenatal care and health behavior. Up to 12 MC were regularly offered; participation in 10 MC is defined as standard screening according to maternity guidelines. Results. Women participated in the first preventive MC on average in the 10th (±3.8 SD) week of pregnancy. 1343 (34.2%) women participated in standard screening and 2039 (51.9%) took a screening above standard. 547 (13.92%) women participated in less than the 10 standard MCs. In addition, about one-third of the pregnancies investigated in this study were unplanned. Bivariate analyses showed an association between better antenatal care behavior and higher maternal age, stabile partnerships and mother born in Germany, p < 0.05. On the contrary antenatal care below standard were more often found by women with unplanned pregnancies, less educational women and women with lower equivalent income, p < 0.001. Health behaviors also influenced antenatal care. Whereas the risk of antenatal care below standard increased by smoking during pregnancy (RRR 1.64; 95% CI 1.25, 2.14) and alcohol consumption (RRR 1.31; 95% CI 1.01, 1.69), supplementation intake was associated with decreased risk (iodine—RRR 0.66; 95% CI 0.53, 0.81; folic acid—RRR 0.56; 95% CI 0.44, 0.72). The health behavior of pregnant women also differs according to their social status. Higher maternal income was negatively correlated with smoking during pregnancy (OR 0.2; 95% CI 0.15, 0.24), but positively associated with alcohol consumption during pregnancy (OR 1.3; 95% CI 1.15, 1.48) and lower pre-pregnancy BMI (Coef. = 0.083, p < 0.001). Lower maternal education was positively correlated with smoking during pregnancy (OR 59.0; 95% CI 28.68, 121.23). Conclusions. Prenatal care according to maternity guidelines is well established with a high participation rate in MC during pregnancy of more than 85%. However, targeted preventive measures may address younger age, socioeconomic status and health-damaging behaviors (smoking, drinking) of the pregnant women because these factors were associated with antenatal care below standard.
Cerebral cavernous malformation (CCM) is a neurovascular disease that can lead to seizures and stroke-like symptoms. The familial form is caused by a heterozygous germline mutation in either the CCM1, CCM2, or CCM3 gene. While the importance of a second-hit mechanism in CCM development is well established, it is still unclear whether it immediately triggers CCM development or whether additional external factors are required. We here used RNA sequencing to study differential gene expression in CCM1 knockout induced pluripotent stem cells (CCM1−/− iPSCs), early mesoderm progenitor cells (eMPCs), and endothelial-like cells (ECs). Notably, CRISPR/Cas9-mediated inactivation of CCM1 led to hardly any gene expression differences in iPSCs and eMPCs. However, after differentiation into ECs, we found the significant deregulation of signaling pathways well known to be involved in CCM pathogenesis. These data suggest that a microenvironment of proangiogenic cytokines and growth factors can trigger the establishment of a characteristic gene expression signature upon CCM1 inactivation. Consequently, CCM1−/− precursor cells may exist that remain silent until entering the endothelial lineage. Collectively, not only downstream consequences of CCM1 ablation but also supporting factors must be addressed in CCM therapy development.
Aims
To investigate factors that influence the willingness of inactive nurses to return to nursing in a crisis situation and to identify aspects that need to be considered with regard to a possible deployment.
Design
A deductive and inductive qualitative content analysis of semi-structured focus group interviews.
Methods
Semi-structured focus group interviews with inactive or marginally employed nurses, nurses who have been inactive for some time and nursing home managers in October and November 2021. The participating inactive nurses had declared their willingness for a deployment during the COVID-19 pandemic or not. Data were analysed using qualitative content analysis.
Results
Communication was seen as essential by the participants for an informed decision for or against a temporary return to nursing and to potential or actual deployments. To make them feel safe, inactive nurses need to know what to expect and what is expected of them, for example, regarding required training and responsibilities. Considering their current employment status, some flexibility in terms of deployment conditions is needed.
A remaining attachment to care can trigger a sense of duty. Knowledge of (regular) working conditions in nursing can lead to both a desire to support former colleagues and a refusal to be exposed to these conditions again.
Conclusion
Past working experiences and the current employment situation play a major role in the willingness of inactive nurses to return to nursing in a crisis situation. Unbureaucratic arrangements must be provided for those who are willing to return.
Summary Statement
What already is known - In crisis situations, not every inactive nurse is willing or able to return to nursing and therefore, the ‘silent reserve’ may not be as large as suspected.
What this paper adds - Inactive nurses need to know what to expect and what is expected of them for their decision regarding a return to active patient care during a crisis situation.
Implications for practice/policy – Inactive nurses need to be informed and should be offered free training and refresher courses to ensure patient safety.
Impact
This research shows that the group of inactive nurses are not a silent workforce which can be activated anytime. Those who are able and willing to return to direct patient care in crisis situations need the best possible support – during and between crises.
Reporting Method
This study adhered to COREQ guidelines.
No Patient or Public Contribution
The involvement of patients or members of the public did not apply for the study, as the aim was to gain insight into the motivations and attitudes of the group of inactive nurses.
Aim
To estimate association between the use of interdental cleaning aids (IDAs) and type on 7-year follow-up levels of interdental plaque, interdental gingival inflammation, interdental periodontitis severity, the number of interdental sound surfaces and the number of missing teeth in a population-based cohort study.
Materials and Methods
We used 7-year follow-up data of 2224 participants from the Study of Health in Pomerania (SHIP-TREND). We applied generalized linear and ordinal logistic models, adjusting for confounding and selection bias using inverse probability treatment weighting and multiple imputation.
Results
Flossers were 32% less likely to have higher interdental plaque (iPlaque) levels than non-users of IDAs (odds ratio [OR] = 0.68; 95% confidence interval [CI]: 0.50–0.94); flossing resulted in 5% lower means of iPlaque. Effects on interdental bleeding on probing (iBOP), mean interdental probing depths and mean interdental clinical attachment levels were direction-consistent but statistically non-significant. Interdental brushing was associated with lower follow-up levels for interdental plaque (OR = 0.73; 95% CI: 0.57–0.93) and iBOP (OR = 0.69; 95% CI: 0.53–0.89). IDAs were more effective in reducing iPlaque in participants with periodontitis, whereas iBOP reduction was more pronounced in participants with no or mild periodontitis. The analyses did not suggest that the use of IDAs affected caries. Finally, applying change score analyses, flossing reduced tooth loss incidence (incidence rate ratio [IRR] = 0.71) compared with non-users of IDAs.
Conclusions
Recommending flossing and interdental brushing in dental practices represents an approach to the prevention of gingivitis and consequently periodontitis.
Aim
To determine the long-term effects of the use of powered tooth brush (PTB) in comparison to manual tooth brush (MTB) on periodontitis severity, coronal caries experience, and the number of missing teeth using in a population-based cohort study.
Materials and Methods
Using 7-year follow-up data of 2214 participants of the Study of Health in Pomerania (SHIP-TREND), comprehensively adjusted linear models using generalized least squares and ordinal regression models estimated the effects of PTB usage on dental outcomes in complete case and imputed data.
Results
At follow-up, PTB users had lower medians for mean probing depth (PD; 2.21 mm) and mean clinical attachment levels (1.73 mm) than MTB users (2.30 and 1.96 mm, respectively). Adjusted models revealed the beneficial effects of PTB usage on follow-up levels of plaque, bleeding on probing, mean PD, percentage of sites with PDs ≥4 mm, mean clinical attachment levels (all, interdental, and non-interdental sites, respectively), and the number of missing teeth. For the number of missing teeth, the effects were more pronounced in participants aged ≥50 years. No significant effects of PTB usage on the number of decayed or filled surfaces (all and interdental sites) were found.
Conclusions
A recommendation of PTB usage in dental practice could contribute to the long-term promotion of oral health.
The impact of the COVID-19 pandemic on social-emotional developmental risks (SE-DR) of preschool children is largely unknown. Therefore, the aim of this prospective longitudinal dynamic cohort study was to assess changes in preschoolers’ SE-DR from before the pandemic to after the first COVID-19 wave. SE-DR were assessed annually with the instrument “Dortmund Developmental Screening for Preschools” (DESK). Longitudinal DESK data from 3- to 4-year-old children who participated both in survey wave (SW) three (DESK-SW3, 2019) and SW four (DESK-SW4, 2020) from August 1 to November 30 were used, respectively. Additionally, data from previous pre-pandemic SW were analyzed to contextualize the observed changes (SW1: 2017; SW2: 2018). A total of N = 786 children were included in the analysis. In the pre-pandemic DESK-SW3, the proportion of children with SE-DR was 18.2%, whereas in DESK-SW4 after the first COVID-19 wave, the proportion decreased to 12.4% (p = 0.001). Thus, the prevalence rate ratio (PRR) was 0.68. Compared to data from previous SW (SW1-SW2: PRR = 0.88; SW2-SW3: PRR = 0.82), this result represents a notable improvement. However, only short-term effects were described, and the study region had one of the highest preschool return rates in Germany. Further studies are needed to examine long-term effects of the pandemic on preschoolers’ SE-DR.
Antimicrobial resistance (AMR) is of paramount importance in the context of One Health, an integrated and unifying approach that aims to achieve a sustainable balance in the well-being of people, domestic and wild animals, plants, and their shared environments. Whenever bacteria become resistant to the therapeutic effects of antibiotics, they can cause infections that are difficult to treat effectively, increasing the risk of severe disease progression and death. Although AMR can develop naturally over time and is per se “ancient”, the excessive use of antibiotics in human and veterinary medicine over the past century has significantly accelerated its emergence and spread. Opportunistic Gram-negative enterobacteria, particularly Escherichia coli (E. coli ) and Klebsiella pneumoniae (K. pneumoniae) strains, increasingly exhibit resistance to multiple classes of clinically used antibiotics, thus presenting multidrug-resistant (MDR) phenotypes. To make matters worse, some of these strains combine multidrug resistance with high-level virulence, posing a threat to both immunocompromised and healthy individuals. Consequently, MDR E. coli and K. pneumoniae have been designated as high-risk pathogens by the World Health Organization, underscoring the urgent need for new antibiotic development.
This thesis is motivated by the fact that only a limited number of international high-risk clonal E. coli and K. pneumoniae lineages stand out across all One Health dimensions and dominate the broad pool of MDR enterobacteria. While we only know little about the underlying drivers and contributing factors impacting their occurrence, emergence, and adaptation across different ecologies, this thesis employs a diverse range of bioinformatics and phenotypic approaches to identify the key factors important for the success of these lineages, also in rather under-explored settings. It includes three main components: (i) the analysis of genomic survey data of MDR E. coli isolates from ecologies in sub-Saharan Africa, (ii) the application of functional genomics and phenotyping techniques to characterize bacterial virulence and assess its clinical relevance in a food-borne E. coli strain, and (iii) the investigation of evolutionary pathways that promote the development of resistance to a novel drug combination and exploring compensatory mechanisms in a K. pneumoniae strain. To achieve these objectives, this research integrates genomics and transcriptomics with molecular biology and functional studies encompassing a comprehensive set of in vitro and in vivo virulence and resilience assays to explore MDR bacteria in-depth.
We provide compelling evidence for the broad occurrence of successful high-risk clonal lineages in the One Health context and their circulation among clinics, wildlife, and food in international locations. In the first study, we isolated extended-spectrum β-lactamase (ESBL)-producing E. coli strains from houseflies collected from various wards at the University Teaching Hospital of Butare (Rwanda). In a follow-up study, we then examined in-depth the genomes of additional ESBL-producing E. coli from the same clinic and obtained from hospitalized patients, their caregivers, associated community members, and pets. The analyses revealed that the sample sets from this sub-Saharan African context consisted predominantly of globally recognized E. coli lineages, including sequence types (ST)131, ST167, ST410, and ST617. They play a pivotal role in the further dissemination and stabilization of AMR across diverse habitats within the One Health context. Moreover, our genomic results emphasize that these One Health-related high-risk clonal lineages exhibit the ability to successfully combine multidrug resistance with high-level bacterial virulence.
To gain a more detailed understanding of the sophisticated interplay of virulence and AMR, we developed and refined a set of in vitro and in vivo methods for virulence phenotyping. These methodologies enabled us to characterize pathogens based on crucial clinical aspects such as biofilm formation, siderophore secretion, resistance to complement-mediated killing, and their capacity to cause mortality in Galleria mellonella larvae. By using a food-borne E. coli strain from an internationally recognized high-risk clonal lineage, we verified the remarkable combination of a MDR phenotype with clinically significant virulence properties, including synthesis of curli fibers and cellulose as part of biofilm formation, extensive secretion of siderophores, resilience against complement-containing human serum and pronounced mortality in the infection model.
Nevertheless, the success of One Health-related high-risk clonal lineages does not rely solely on an “ideal” synergistic interplay between bacterial virulence and AMR. It also depends on their ability to rapidly mitigate the fitness costs associated with AMR acquisition, as these costs manifest in the form of reduced competitiveness and virulence in the absence of antibiotics. However, this is at odds with the observation of the global distribution of One Health-related high-risk clonal lineages across various One Health dimensions, even in environments with expectedly low selection pressures. To comprehensively address this, we conducted experimental evolution studies selecting for ceftazidime-avibactam-resistant mutants, which illuminated the rapid adaptations to changing environments. The adaptations and compensatory mechanisms were seemingly driven by major bacterial regulators, including the envelope stress response regulator RpoE on genomic and transcriptomic levels.
In conclusion, the results of this thesis shed light on the fundamental principles that govern the character and interplay between AMR and bacterial virulence and advance our understanding of the contributors and drivers of successful MDR international high-risk clonal lineages in the One Health context. This is also important for effective and alternative intervention strategies to prospectively further address the global threat of AMR.
Plus‐strand RNA [(+)RNA] viruses are the largest group of viruses, medically highly relevant human pathogens, and are a socio‐economic burden. The current global pandemic of the severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) shows how a virus has been rapidly spreading around the globe and that– without an antiviral treatment– virus trans mission is solely dependent on human behavior. However, other (+)RNA viruses such as rhino‐, noro‐, dengue‐ (DENV), Zika, and hepatitis C virus (HCV) are constantly spreading and expanding geographically. As in the case of hepatitis C, since its first identification in the 1970s, it took more than 30 years to understand the HCV structure, genome organiza t ion, life cycle, and virus‐host interplay leading to the cure of a chronic and life‐threatening disease. However, no vaccination or antiviral treatment exists for most (+)RNA viruses. Con sequently, a precise and comprehensive analysis of the viruses, their life cycles, and parasitic interactions with their hosts remains an important field of research. In the presented thesis, we use mathematical modeling to study the life cycles of (+)RNA viruses. We analyze replication strategies of closely related (+)RNA viruses, namely HCV, DENV, and coxsackievirus B3 (CVB3), to compare their life cycles in the presence and ab sence of the host’s immune response and antiviral drug treatment and consider different viral spreading mechanisms. Host dependency factors shape the viral life cycle, contribut ing to permissiveness and replication efficiency. Our mathematical models predicted that host dependency factors, such as ribosomes, and thus the virus’ ability to hijack the host cell’s translation machinery play an essential role in the viral genome replication efficiency. Furthermore, our mathematical model suggested that the availability of ribosomes in the vi ral life cycle is a crucial factor in disease outcome: the development of an acute or chronic disease. Even though the host developed strategies to attack the virus, e.g., by degrading the viral genome, blocking the viral protein production, and preventing viral spread, viruses found strategies to countermeasure those so‐called host restriction factors derived from the immune system. Our mathematical models predicted that DENV might be highly effective in blocking the cell’s attempts to recognize the invader. Moreover, we found ongoing HCV RNAreplication even with highly effective antiviral drugs that block processes in the viral life cycle. Furthermore, we found alternative pathways of infection spread, e.g., by HCV RNA carrying exosomes, which may be a possible explanation for reported plasma HCV RNA at the end of treatment, found in a subset of patients. Hence, the mathematical models presented in this thesis provide valuable tools to study the viral replication mechanism in detail. Even though being a simplification of reality, our model predictions confirm and explain known and suggest novel biological mechanisms. In the pre sented thesis, I will summarize and discuss key findings and contextualize model predictions in the broader scientific literature to improve our understanding of the viral dynamics and the virus‐host interplay.
Bei der chronisch obstruktiven Lungenerkrankung handelt es sich um eine pulmonale Erkrankung mit persistierender respiratorischer Symptomatik. Für die Erkrankung pathognomonisch ist eine Atemflussminderung aufgrund einer progressiven Atemwegsobstruktion. Trotz individueller Krankheitsverläufe und verschiedenen klinischen Phänotypen resultiert häufig eine chronisch respiratorische Insuffizienz mit obstruktiver Ventilationsstörung, welche sich limitierend auf die Überlebenszeit auswirkt und die Wahrscheinlichkeit für wiederholte Hospitalisierungen erhöht. Die nichtinvasive Beatmung stellt seit Jahren eine etablierte und anerkannte Therapieoption der akuten respiratorischen Insuffizienz bei COPD-Patienten da. Weniger eindeutig verhält sich jedoch die Studienlage bezüglich der Etablierung einer langfristigen außerklinischen NIV-Therapie bei COPD-Patienten mit chronisch respiratorischer Insuffizienz. Kurz- und Langzeiteffekte dieser Therapieoption bei chronisch respiratorischer Insuffizienz wurden in den letzten 20 Jahren nur in wenigen Publikationen untersucht und es konnte kein Vorteil hinsichtlich des Überlebens von Patienten mit Überleitung auf eine LTH-NIV-Therapie gezeigt werden. Ziel dieser retrospektiven Studie war es, die Auswirkungen der NIV-Therapie auf das Langzeitüberleben und die Rehospitalisierung zu untersuchen und mögliche Einflussfaktoren bzw. Prädiktoren auf diese zu identifizieren. Zur Beantwortung der Fragestellung wurden 151 Patienten in die Studie eingeschlossen, welche sich in dem Zeitraum vom 01.01.2012 bis 30.06.2019 aufgrund einer akuten nicht-invasiven Beatmungsnotwenigkeit bei AECOPD in den Abteilungen für innere Medizin der UMG in Behandlung befanden. Vom Gesamtkollektiv wurden 83 Patienten im Anschluss an den Indexkrankenhausaufenthalt direkt auf eine LTH-NIV-Therapie eingestellt. Die Non-NIV-Gruppe bildeten 68 Patienten, welche ohne Überleitung auf eine LTH-NIV-Therapie nach dem Indexaufenthalt aus dem Krankenhaus entlassen wurden. Über ein Follow-up von zwei Jahren wurden Blutgasanalysen, Beatmungsparameter, Rehospitalisierungen und die Mortalität betrachtet. Es wurden eine Überlebenszeitanalyse nach der Kaplan-Meier-Methode sowie eine Cox-Regression zur Analyse mehrerer Einflussgrößen auf das Überleben im Gruppenvergleich durchgeführt.
In der vorliegenden retrospektiven Datenauswertung von COPD-Patienten mit akuter nicht-invasiver Beatmungsnotwendigkeit im Rahmen einer AECOPD, konnte gezeigt werden, dass die Einstellung auf eine LTH-NIV-Therapie das Überleben in einem zweijährigen Beobachtungszeitraum signifikant (p=0,027) verbessert. Das 24-Monats-Risiko einer Rehospitalisierung lag in der LTH-NIV-Gruppe bei 41% gegenüber 55,9% in der Non-NIV-Gruppe. Dieses Ergebnis verfehlte nur knapp die statistische Signifikanz (p=0,053). In der statistischen Testung ergab sich ein verringertes Mortalitätsrisiko bei den Patienten, die im direkten Anschluss an eine AECOPD auf eine LTH-NIV-Therapie übergeleitet wurden [HR: 0,37 (0,17; 0,79)].
Der Fokus der vorliegenden Studie lag auf der Untersuchung der Beziehung
zwischen CRF und RV-Struktur und Funktion in einer großen, bevölkerungsbasierten
Kohorte bestehend aus weitgehend körperlich inaktiven Erwachsenen. Damit
widmete sich diese Studie einer aktuellen Problemstellung, da die Bevölkerung
aufgrund des demographischen Wandels stets älter wird und der Prozentsatz an
körperlich inaktiven Erwachsenen bereits jetzt schon ein hohes Niveau erreicht hat
und zusätzlich bisher noch wenige Informationen für den RV-Umbau vorliegen.
Die Kohorte umfasste 2 844 Proband:innen aus zwei unabhängigen SHIP-Kohorten,
die eine CPET für die Bestimmung der VO2peak absolvierten.
Ein weiterer wesentlicher Aspekt der Studie waren die beiden unterschiedlichen
bildgebenden Verfahren, die zur Bestimmung der RV-Struktur und Funktion
verwendet wurden. Alle Proband:innen erhielten eine Echokardiographie und 941
Proband:innen zusätzlich eine cMRT.
Die Ergebnisse, zusammengefasst in Abbildung 6, zeigen letztendlich, dass eine
geringere CRF mit einer kleineren Kammergröße und einer geringeren systolischen
Funktion, einem geringeren Schlagvolumen und einer geringeren Herzleistung des
rechten Herzens verbunden ist.
Dieser Zusammenhang könnte die zuvor beschriebene altersbedingte Abnahme der
Herzgröße erklären, wobei der bewegungsarme Lebensstil der meisten Personen
während des gesamten Lebens und der Alterungsprozess die wichtigsten Beiträge
hierzu sein könnten.
Diese Daten unterstützen somit die Idee, dass reduzierte VO2peak-Werte eine
Kombination aus körperlicher Inaktivität, Atrophie des Herzens und
Alterungsprozessen sind.
Weitere Studien sind jedoch erforderlich, um die Mechanismen dieser
Veränderungen für eine mögliche therapeutische Nutzung im Detail zu identifizieren
und mehr Informationen über die klinische Relevanz des rechten Ventrikels zu
entwickeln, möglicherweise auch in verschiedenen Ethnien.
Multidrug-resistant gram-negative pathogens such as Escherichia coli have become increasingly difficult to treat and therefore alternative treatment options are needed. Targeting virulence factors like biofilm formation could be one such option. Inhibition of biofilm-related structures like curli and cellulose formation in E. coli has been shown for different phenolic natural compounds like epigallocatechin gallate. This study demonstrates this effect for other structurally unrelated phenolics, namely octyl gallate, scutellarein and wedelolactone. To verify whether these structurally different compounds influence identical pathways of biofilm formation in E. coli a broad comparative RNA-sequencing approach was chosen with additional RT-qPCR to gain initial insights into the pathways affected at the transcriptomic level. Bioinformatical analysis of the RNA-Seq data was performed using DESeq2, BioCyc and KEGG Mapper. The comparative bioinformatics analysis on the pathways revealed that, irrespective of their structure, all compounds mainly influenced similar biological processes. These pathways included bacterial motility, chemotaxis, biofilm formation as well as metabolic processes like arginine biosynthesis and tricarboxylic acid cycle. Overall, this work provides the first insights into the potential mechanisms of action of novel phenolic biofilm inhibitors and highlights the complex regulatory processes of biofilm formation in E. coli.
Introduction
The concept of thermal ablation has proven a minimally invasive alternative or accompaniment to conventional tumour therapy. Patients with hepatic primary tumours or metastases are able to profit from it. Several modalities of thermal ablation exist, including radiofrequency ablation, microwave ablation and laser ablation. They differ in regards to their indications and their physical backgrounds, yet they all share the same aim: the hyperthermic ablation of tumorous target tissue.
At this point in time the maximum ablation diameter attained in a singular session using a singular applicator is about 30 mm. The maximum attainable volume is about 23 cm3. However, the mean and median of hepatic lesions exceed that number with about 50 mm. Most hepatic tumours therefore cannot be easily ablated in toto.
One of the main limitations of thermal ablation is the periprocedural transformation of vital tissue into a boundary layer. This boundary layer prevents efficient energy transmission into peripheral tissue and thus limits the potential of thermal ablation. The boundary layer is usually located centrally around the ablation applicator. In laser ablation the formation of this boundary layer is called carbonisation.
A technically simple, yet potentially effective approach to delay or prevent the formation of this boundary layer is the usage of a spacer. This perfused spacer cools the central zone surrounding the applicator. Therefore central temperatures remain beyond the point of carbonisation.
Methods
The development of two spacer prototypes took place in cooperation with the AG “Experimentelle Radiologie” of the University Clinic Charité. The first fully closed prototype featured an internal circulation of cooling fluid without tissue perfusion. The second open prototype perfused into tissue through an opened tip.
The conduct of this study included ex vivo experiments on bovine livers (n = 15) by means of laser ablation. Ablation diameter and ablation volume were recorded through MR-guided volumetry and manual displacement volumetry. The mean values of diameter and volume that were recorded when the stand-alone applicator system was used were then compared to the mean values recorded when using the closed spacer-supported applicator system and the open spacer-supported applicator system. The difference in values between the three applicator types were then examined for statistical significance using SPSS.
To exclude covariates a preliminary experiment was conducted which aimed to maximise power input of the laser and time interval while minimising the chance of carbonisation. For that, one of the variables was increased in intervals and the ablation diameter of all three applicator types was measured until carbonisation occurred.
Results
In the preliminary experiment it was found that following the increase of the pre-set power input of the laser a proportional increase of ablation diameter followed. However when increasing power input above 25 Watt almost instantaneous carbonisation of the central tissue occurred. This was the same for all three applicator types.
When increasing the time interval > 10 minutes the stand-alone applicator system showed central carbonisation, which was not the case when using the closed spacer-supported applicator system or the open spacer-supported applicator system. The two spacer prototypes only experienced carbonisation when a time interval of > 25 minutes was set. Thus the comparison of all three applicator types was conducted at 25 Watt and 10 minutes, whereas the comparison between the closed spacer-supported applicator system and the open spacer-supported applicator system was conducted at 25 Watt and 25 minutes.
During the first experiment the stand-alone applicator system achieved mean values of 37.50 mm ablation diameter and 23.61 cm3 ablation volume. This was a statistically significant (p < 0.001) increase to the values either spacer was able to attain: the closed spacer-supported applicator system recorded a mean value of 28.67 mm ablation diameter and 18.12 cm3 ablation volume, whereas the open spacer-supported applicator system recorded a mean value of 31.00 mm ablation diameter and 18.49 cm3 ablation volume. However, setting a longer time interval was not possible when the stand-alone applicator system was used for ablation. Due to this, a second experiment comparing mean ablation diameter and volume between the two spacer prototypes followed.
During the second experiment with a time interval of 25 minutes the closed spacer-supported applicator system attained a mean value of 52.07 mm ablation diameter and 75.25 cm3 ablation volume. These values showed a statistically significant (p < 0.001) difference in comparison to the open spacer-supported applicator system with mean values of 47.60 mm ablation diameter und 72.20 cm3 ablation volume.
Discussion
Within the framework of this study it was proven that the presence of a spacer between laser applicator and hepatic tissue was able to achieve a significant increase in ablation diameter and ablation volume. By using a closed spacer an increase in volume by a 3.19 factor of change was possible. The open spacer obtained an increase in volume by a 3.06 factor of change. The concept of using a spacer in thermal ablation as a proof of concept study is therefore valid and suitable for further pre-clinical studies.
Life-threatening toxic shock syndrome is often caused by the superantigen toxic shock syndrome toxin-1 (TSST-1) produced by Staphylococcus aureus. A well-known risk factor is the lack of neutralizing antibodies. To identify determinants of the anti-TSST-1 antibody response, we examined 976 participants of the German population-based epidemiological Study of Health in Pomerania (SHIP-TREND-0). We measured anti-TSST-1 antibody levels, analyzed the colonization with TSST-1-encoding S. aureus strains, and performed a genome-wide association analysis of genetic risk factors. TSST-1-specific serum IgG levels varied over a range of 4.2 logs and were elevated by a factor of 12.3 upon nasal colonization with TSST-1-encoding S. aureus. Moreover, the anti-TSST-1 antibody levels were strongly associated with HLA class II gene loci. HLA-DRB1*03:01 and HLA-DQB1*02:01 were positively, and HLA-DRB1*01:01 as well as HLA-DQB1*05:01 negatively associated with the anti-TSST-1 antibody levels. Thus, both toxin exposure and HLA alleles affect the human antibody response to TSST-1.
Background: The global obesity epidemic is a major public health concern, and accurate diagnosis is essential for identifying at-risk individuals. Three-dimensional (3D) body scanning technology offers several advantages over the standard practice of tape measurements for diagnosing obesity. This study was conducted to validate body scan data from a German population-based cohort and explore clinical implications of this technology in the context of metabolic syndrome. Methods: We performed a cross-sectional analysis of 354 participants from the Study of Health in Pomerania that completed a 3D body scanning examination. The agreement of anthropometric data obtained from 3D body scanning with manual tape measurements was analyzed using correlation analysis and Bland–Altman plots. Classification agreement regarding abdominal obesity based on IDF guidelines was assessed using Cohen’s kappa. The association of body scan measures with metabolic syndrome components was explored using correlation analysis. Results: Three-dimensional body scanning showed excellent validity with slightly larger values that presumably reflect the true circumferences more accurately. Metabolic syndrome was highly prevalent in the sample (31%) and showed strong associations with central obesity. Using body scan vs. tape measurements of waist circumference for classification resulted in a 16% relative increase in the prevalence of abdominal obesity (61.3% vs. 52.8%). Conclusions: These results suggest that the prevalence of obesity may be underestimated using the standard method of tape measurements, highlighting the need for more accurate approaches.
Objective: The study aimed to test the reliability of a semi-structured telephone interview for the classification of headache disorders according to the ICHD-3.
Background: Questionnaire-based screening tools are often optimized for single primary headache diagnoses [e.g., migraine (MIG) and tension headache (TTH)] and therefore insufficiently represent the diagnostic precision of the ICHD-3, which limits epidemiological research of rare headache disorders. Brief semi-structured telephone interviews could be an effective alternative to improve classification.
Methods: A patient population representative of different primary and secondary headache disorders (n = 60) was recruited from the outpatient clinic (HSA) of a tertiary care headache center. These patients completed an established population-based questionnaire for the classification of MIG, TTH, or trigeminal autonomic cephalalgia (TAC). In addition, they received a semi-structured telephone interview call from three blinded headache specialists individually. The agreement of diagnoses made either using the questionnaires or interviews with the HSA diagnoses was evaluated.
Results: Of the 59 patients (n = 1 dropout), 24% had a second-order and 5% had a third-order headache disorder. The main diagnoses were as follows: frequent primary headaches with 61% MIG, 10% TAC, 9% TTH, and 5% rare primary and 16% secondary headaches. Second-order diagnosis was chronic migraine throughout, and third-order diagnoses were medication overuse headache and TTH. Agreement between main headaches from the HSA was significantly better for the telephone interview than for the questionnaire (questionnaire: κ = 0.330; interview: κ = 0.822; p < 0.001). Second-order diagnoses were not adequately captured by questionnaires, while there was a trend for good agreement with the telephone interview (κ = 0.433; p = 0.074). Headache frequency and psychiatric comorbidities were independent predictors of HSA and telephone interview agreement. Male sex, headache frequency, severity, and depressive disorders were independently predictive for agreement between the questionnaire and HSA. The telephone interview showed high sensitivity (≥71%) and specificity (≥92%) for all primary headache disorders, whereas the questionnaire was below 50% in either sensitivity or specificity.
Conclusion: The semi-structured telephone interview appears to be a more reliable tool for accurate diagnosis of headache disorders than self-report questionnaires. This offers the potential to improve epidemiological headache research and care even in underserved areas.
Post-COVID-19 syndrome (PCS) has been described as ‘the pandemic after the pandemic’ with more than 65 million people worldwide being affected. The enormous range of symptoms makes both diagnosis complex and treatment difficult. In a post-COVID rehabilitation outpatient clinic, 184 patients, mostly non-hospitalized, received a comprehensive, interdisciplinary diagnostic assessment with fixed follow-up appointments. At baseline, three in four patients reported more than 10 symptoms, the most frequent symptoms were fatigue (84.9%), decreased physical capacity (83.0%), tiredness (81.1%), poor concentration (73.6%), sleeping problems (66.7%) and shortness of breath (67.3%). Abnormalities were found in the mean values of scores for fatigue (FAS = 34.3), cognition (MoCA = 25.5), psychological alterations (anxiety, depression, post-traumatic stress disorder), limitation of lung function (CAT) and severity scores for PCS (PCFS, MCRS). Clinical abnormalities were found in elevated values of heart rate, breathing rate at rest, blood pressure and NT-proBNP levels. As the frequency of the described symptoms decreases only slowly but most often significantly over the course, it is important to monitor the patients over a longer period of time. Many of them suffer from an immense symptom burden, often without pre-existing clinical correlates. Our results show a clear association with objectifiable assessments and tests as well as pronounced symptoms.
Background and purpose
The insula has important functions in monitoring and integrating physiological responses to a personal experience of multimodal input. The experience of chills in response to auditory stimuli is an important example for a relevant arousing experience coupled with bodily response. A group study about altered chill experiences in patients with insula lesions is lacking.
Methods
Twenty-eight stroke patients with predominantly insula lesions in the chronic stage and 14 age-matched controls were investigated using chill stimuli of both valences (music, harsh sounds). Group differences were analyzed in subjective chill reports, associated bodily responses (skin conductance response), lesion mapping, diffusion-weighted imaging and functional magnetic resonance imaging. Other neuropsychological deficits were excluded by comprehensive testing. Diffusion-weighted imaging was quantified for four insula tracts using fractional anisotropy.
Results
The frequency of chill experiences was comparable between participant groups. However, bodily responses were decreased for the stroke group. Whereas there was no association of lesion location, a positive association was found for the skin conductance response during aversive sounds and the tract connecting anterior inferior insula and left temporal pole in the stroke group. Similarly, functional magnetic resonance imaging activation in areas hypothesized to compensate for damage was increased with bodily response.
Conclusions
A decoupling of felt arousal and bodily response after insula lesion was observed. Impaired bodily response was related to an impaired interaction of the left anterior insula and the temporal pole.
Die Expositionstherapie ist die Methode der Wahl zur Behandlung von Angsterkrankungen. Die Mechanismen, die einer erfolgreichen Expositionstherapie zugrunde liegen, sind allerdings noch nicht ausreichend geklärt.
Diese Arbeit beschäftigt sich zum Einen mit Optimierungsstrategien zur Verbesserung der Expositionstherapie und analysiert zum Anderen in grundlagenexperimentellen Untersuchungen sowohl Rekonsolidierungsprozesse als auch die Mechanismen von Extinktionslernen als dem derzeit angenommenen primären Wirkfaktor von Expositionstherapie.
Research into nuclear physics has enjoyed a long and rich history since the earliest experiments began investigating atomic constituents. The discovery of the atomic nucleus in the early 20th century started a complex field of research that has undergone many transformations with the advancements of modern technology. Today, atomic nuclei are not only studied to advance our understanding of the strong force but also to gain more information on the synthesis of elements in the universe, to exploit nuclear decay to investigate the weak interaction, and to search for physics beyond the standard model.
In this work, we will study the strong force in atomic nuclei, i.e. the way nucleons (protons and neutrons) arrange themselves in a many-body system governed by the repulsive Coulomb interaction and the attractive strong interaction. In particular, we will focus on nuclear structure near nuclei with a "magic number" of Z protons and N neutrons, so-called doubly-magic nuclei, exhibiting a particularly stable configuration with respect to neighboring nuclei.
Within the nuclear shell model, similar to the atomic shells, the magic numbers indicate shell closures accompanied by energy gaps. Nuclei at double-shell closures and their direct vicinity provide an important playground to benchmark nuclear theories and models that aim to predict the intricate interplay of the nucleons that lead to enhanced nuclear binding energies, significant changes in charge radii and transition strengths, etc.
Of particular interest are nuclear isomers, long-lived excited states, in which the nucleon configuration with respect to its ground state is altered, resulting in a modification of their properties despite having the same number of protons and neutrons.
The main part of this work consists of three publications, which report on nuclear structure investigations through mass measurements and laser spectroscopy near the doubly magic nuclei nickel-78, tin-100, and lead-208.
The nuclides investigated in this work include neutron-deficient indium isotopes, neutron-rich zinc isotopes, and neutron-rich mercury isotopes.
Background
Only about half the people with depression seek professional health care services. To constitute the different predictors and associating variables of health care utilisation, we model the process and aim to test our hypothesised Seeking Mental Health Care Model. The model includes empirical influences on the help-seeking process to predict actual behaviour and incorporates superordinate (stigma, treatment experiences) as well as intermediate attitudinal variables (continuum and causal beliefs, depression literacy and self-efficacy).
Method
All variables are examined in an online study (baseline, three- and six-month follow-up). The sample consisted of adults with depressive symptoms (PHQ-9 sum score ≥ 8), currently not receiving mental health care treatment. To examine the prediction of variables explaining help-seeking behaviour, a path model analysis was carried out (lavaan package, software R).
Results
Altogether, 1368 participants (Mage = 42.38, SDage = 15.22, 65.6% female) were included, 983 participating in at least one follow-up. Model fit was excellent (i.e., RMSEA = 0.059, CFI = 0.989), and the model confirmed most of the hypothesised predictions. Intermediary variables were significantly associated with stigma and experiences. Depression literacy (ß = .28), continuum beliefs (ß = .11) and openness to a balanced biopsychosocial causal model (ß = .21) significantly influenced self-identification (R2 = .35), which among the causal beliefs and self-efficacy influenced help-seeking intention (R2 = .10). Intention (ß = .40) prospectively predicted help-seeking behaviour (R2 = .16).
Conclusion
The Seeking Mental Health Care Model provides an empirically validated conceptualisation of the help-seeking process of people with untreated depressive symptoms as a comprehensive approach considering internal influences. Implications and open questions are discussed, e.g., regarding differentiated assessment of self-efficacy, usefulness of continuum beliefs and causal beliefs in anti-stigma work, and replication of the model for other mental illnesses.
Trial registration
German Clinical Trials Register: DRKS00023557. Registered 11 December 2020. World Health Organization, Universal Trial Number: U1111–1264-9954. Registered 16 February 2021.
Scribble complex proteins can influence cell fate decisions and self-renewal capacity of hematopoietic cells. While specific cellular functions of Scribble complex members are conserved in mammalian hematopoiesis, they appear to be highly context dependent. Using CRISPR/Cas9-based genetic screening, we have identified Scribble complex-related liabilities in AML including LLGL1. Despite its reported suppressive function in HSC self-renewal, inactivation of LLGL1 in AML confirms its relevant role for proliferative capacity and development of AML. Its function was conserved in human and murine models of AML and across various genetic backgrounds. Inactivation of LLGL1 results in loss of stemness-associated gene-expression including HoxA-genes and induces a GMP-like phenotype in the leukemia stem cell compartment. Re-expression of HoxA9 facilitates functional and phenotypic rescue. Collectively, these data establish LLGL1 as a specific dependency and putative target in AML and emphasizes its cell-type specific functions.
The multi-cell Penning–Malmberg trap concept has been proposed as a way to accumulate and confine unprecedented numbers of antiparticles, an attractive but challenging goal. We report on the commissioning and first results (using electron plasmas) of the World's second prototype of such a trap, which builds and improves on the findings of its predecessor. Reliable alignment of both ‘master’ and ‘storage’ cells with the axial magnetic field has enabled confinement of plasmas, without use of the ‘rotating wall’ (RW) compression technique, for over an hour in the master cell and tens of seconds in the storage cells. In the master cell, attachment to background neutrals is found to be the main source of charge loss, with an overall charge-confinement time of 8.6 h. Transfer to on-axis and off-axis storage cells has been demonstrated, with an off-axis transfer rate of 50% of the initial particles, and confinement times in the storage cells in the tens of seconds (again, without RW compression). This, in turn, has enabled the first simultaneous plasma confinement in two off-axis cells, a milestone for the multi-cell trap concept.
Background
Adolescents and young adults (AYAs) with chronic conditions face a transfer, defined as an actual shift from paediatric to adult-oriented health care. Transition competence as the self-perceived knowledge, skills and abilities regarding the transition process was considered extremely useful.
Aim
This study was designed to investigate the impact of transition competence before and after the transfer on disease-specific quality of life (QoL) and health care satisfaction of AYAs with diabetes.
Results
In total, a sample of N = 90 AYAs with diabetes self-reported their transition competence, diabetes-specific QoL and satisfaction with care. Multiple linear regressions were used to analyse the impact of transition competence on satisfaction with care and QoL. Transition competence positively influenced the outcomes of satisfaction with care and QoL.
Conclusion
Young adults with diabetes showed higher transition competence scores than adolescents with diabetes.
Purpose
The WHO 2016 re-classification of myeloproliferative neoplasms resulted in a separation of essential thrombocythemia (ET) from the pre-fibrotic and fibrotic (overt) phases of primary myelofibrosis (MF). This study reports on a chart review conducted to evaluate the real life approach regarding clinical characteristics, diagnostic assessment, risk stratification and treatment decisions for MPN patients classified as ET or MF after implementation of the WHO 2016 classification.
Methods
In this retrospective chart review, 31 office-based hematologists/oncologists and primary care centers in Germany participated between April 2021 and May 2022. Physicians reported available data obtained from patient charts via paper–pencil based survey (secondary use of data). Patient features were evaluated using descriptive analysis, also including diagnostic assessment, therapeutic strategies and risk stratification.
Results
Data of 960 MPN patients diagnosed with essential thrombocythemia (ET) (n = 495) or myelofibrosis (MF) (n = 465) after implementation of the revised 2016 WHO classification of myeloid neoplasms was collected from the patient charts. While they met at least one minor WHO-criteria for primary myelofibrosis, 39.8% of those diagnosed with ET did not have histological BM testing at diagnosis. 63.4% of patients who were classified as having MF, however, did not obtain an early prognostic risk assessment. More than 50% of MF patients showed characteristics consistent with the pre-fibrotic phase, which was emphasized by the frequent use of cytoreductive therapy. Hydroxyurea was the most frequently used cytoreductive medication in 84.7% of ET and 53.1% of MF patients. While both ET and MF cohorts showed cardiovascular risk factors in more than 2/3 of the cases, the use of platelet inhibitors or anticoagulants varied between 56.8% in ET and 38.1% in MF patients.
Conclusions
Improved histopathologic diagnostics, dynamic risk stratification including genetic risk factors for cases of suspected ET and MF are recommended for precise risk assessment and therapeutic stratification according to WHO criteria.
Purpose
Outcomes of multiple myeloma (MM) patients who are refractory to daratumumab are dismal and no standard of treatment exists for this patients’ population. Here, we investigate the role of pomalidomide combinations in daratumumab-refractory MM patients.
Methods
We performed a retrospective analysis of myeloma patients treated at four referral centers (three in Germany and one in Italy). Review chart identified 30 patients with relapsed and refractory myeloma, who progressed during treatment with daratumumab and were treated with pomalidomide-based combinations in the subsequent lines of therapy.
Results
Responses improved from 37% with daratumumab to 53% with pomalidomide. Of seven patients with extramedullary MM (EMM), four achieved a clinical stabilization with pomalidomide, including one patient with a long-lasting complete response. Median progression-free survival and overall survival were 6 and 12 months, respectively. Pomalidomide combinations were well tolerated, no patient discontinued treatment due to adverse events.
Conclusion
These data show that pomalidomide-based combinations can be an effective and safe salvage regimen for daratumumab-refractory patients, including those with EMM.
Urbanization, industrialization, and intensification of agriculture have led to considerable heavy metal pollution across the globe, harming our ecosystems. Concentrations of arsenic (As), cadmium (Cd), copper (Cu), and lead (Pb) have been analysed in 249 eggshells collected between 2006 and 2021 from 83 female Common Cranes (Grus grus) nesting within north-eastern Germany. Information on the presence of trace elements in cranes from Europe and their potential adverse effects on the reproduction are largely missing. Only Cu and Pb were found to be present in eggshell samples. Levels of both metals did not exceed concentrations considered potentially toxic in birds and unhatched eggs did not contain higher metal concentrations compared to eggshell residues from hatched eggs. Statistical analysis revealed that trace element concentrations decreased significantly over the course of the study period. The ban of leaded gasoline in the early twenty-first century and strict limitations of heavy metal-based biocontrol products are likely responsible for this decrease over the years. However, as Cu levels gradually increase with increasing proportions of agricultural areas within the cranes’ home ranges, we suggest that considerable amounts of Cu originating from agricultural practises are still being released into the environment. We found no increase in metal concentrations in eggshells with increasing female age, suggesting that heavy metals do not accumulate in the circulatory systems of the adults over time. This study is the first to assess heavy metal contamination in Common Cranes and indicates the suitability of crane’s eggshells as bioindicator for monitoring environmental pollution.
Background
A bidirectional functional link between vestibular and fear-related disorders has been previously suggested.
Objective
To test a potential overlap of vestibular and fear systems with regard to their brain imaging representation maps.
Methods
By use of voxel-based mapping permutation of subject images, we conducted a meta-analysis of earlier functional magnetic resonance imaging (fMRI) studies applying vestibular stimulation and fear conditioning in healthy volunteers.
Results
Common clusters of concordance of vestibular stimulation and fear conditioning were found in the bilateral anterior insula cortex, ventrolateral prefrontal cortex and the right temporal pole, bilaterally in the adjacent ventrolateral prefrontal cortex, cingulate gyrus, secondary somatosensory cortex, superior temporal and intraparietal lobe, supplementary motor area and premotor cortex, as well as subcortical areas, such as the bilateral thalamus, mesencephalic brainstem including the collicular complex, pons, cerebellar vermis and bilateral cerebellar hemispheres. Peak areas of high concordance for activations during vestibular stimulation but deactivations during fear conditioning were centered on the posterior insula and S2.
Conclusions
The structural overlap of both networks allows the following functional interpretations: first, the amygdala, superior colliculi, and antero-medial thalamus might represent a release of preprogramed sensorimotor patterns of approach or avoidance. Second, the activation (vestibular system) and deactivation (fear system) of the bilateral posterior insula is compatible with the view that downregulation of the fear network by acute vestibular disorders or unfamiliar vestibular stimulation makes unpleasant perceived body accelerations less distressing. This also fits the clinical observation that patients with bilateral vestibular loss suffer from less vertigo-related anxiety.
Background
Chronic pain of different aetiologies and localization has been associated with less grey matter volume (GMV) in several cortical and subcortical brain areas. Recent meta-analyses reported low reproducibility of GMV alterations between studies and pain syndromes.
Methods
To investigate GMV in common chronic pain conditions defined by body location (chronic back pain, n = 174; migraine, n = 92; craniomandibular disorder, n = 39) compared to controls (n = 296), we conducted voxel-based morphometry and determined GMV from high-resolution cranial MRIs obtained in an epidemiologic survey. Mediation analyses were performed between the presence of chronic pain and GMV testing the mediators stress and mild depression. The predictability of chronic pain was investigated with binomial logistic regression.
Results
Whole-brain analyses yielded reduced GMV within the left anterior insula and the anterior cingulate cortex, for a ROI approach additionally the left posterior insula and left hippocampus showing less GMV across all patients with chronic pain. The relationship of pain with GMV in the left hippocampus was mediated by self-reported stressors in the last 12 months. Binomial logistic regression revealed a predictive effect for GMV in the left hippocampus and left anterior insula/temporal pole for the presence of chronic pain.
Conclusions
Chronic pain across three different pain conditions was characterized by less GMV in brain regions consistently described for different chronic pain conditions before. Less GMV in the left hippocampus mediated by experienced stress during the last year might be related to altered pain learning mechanisms in chronic pain patients.
Significance
Grey matter reorganization could serve as a diagnostic biomarker for chronic pain. In a large cohort, we here replicated findings of less grey matter volume across three pain conditions in the left anterior and posterior insula, anterior cingulate and left hippocampus. Less hippocampal grey matter was mediated by experienced stress.
Flupirtine and retigabine were essential drugs to combat pain and epilepsy. However, the Kv7 potassium channel openers are fraught with hepatotoxicity and tissue discoloration, respectively, limiting their therapeutic value. Both adverse events are likely due to reactive metabolites arising from oxidative metabolism. Designing safer analogues lacking the structural elements leading to described side effects is an active area of current research. One of the main metabolites of flupirtine is the biologically inactive 4-fluorohippuric acid. Hitherto unexplained, the proposed metabolic pathway leading to the formation of 4-fluorohippuric acid from flupirtine is verified here. Through the use of eighteen flupirtine analogues, mechanistic details of this pathway could be elucidated. A possible connection with the in vitro hepatotoxicity of the flupirtine analogues and the levels of 4-fluorobenzoic acid formed in enzyme incubations was examined by correlation analysis. These findings provide important information for the design of new flupirtine analogues as potential drug candidates.
In rural areas, healthcare providers, patients and relatives have to cover long distances. For specialised ambulatory palliative care (SAPV), a supply radius of max. 30 km is recommended. The aim of this study was to analyse whether there are regional disparities in the supply of SAPV and whether it is associated with the distance between the SAPV team’s site and the patient’s location. Therefore, anonymised data of the Association of Statutory Health Insurance Physicians of the Federal State of Mecklenburg-Western Pomerania (M-V) were retrospectively analysed for the period of 2014–2017. Identification as a palliative patient was based on palliative-specific items from the ambulatory reimbursement catalogue. In total, 6940 SAPV patients were identified; thereof, 48.9% female. The mean age was 73.3 years. For 28.3% of the identified SAPV patients (n = 1961), the SAPV teams had a travel distance of >30 km. With increasing distance, the average number of treatment days per patient increased. It was found that there are regional disparities in the provision of SAPV services in M-V and that local structures have an important impact on regional supply patterns. The distance between the SAPV team’s site and the patient’s location is not the only determining factor; other causes must be considered.
Ion traps such as Paul traps and MR-ToF (multi-reflection time-of-flight) devices are indispensable tools at radioactive ion beam facilities for the preparation of high-quality radioactive ion beams for subsequent experiments or for precise measurements of the properties of radioactive ions, such as nuclear binding energies or nuclear charge radii.
Within the work of this thesis, Doppler- and sympathetic cooling is implemented in a linear Paul-trap cooler-buncher enabling a reduction of the longitudinal emittance of radioactive ion beams resulting in a significant improvement of the ion beam quality. Moreover, a next-generation MR-ToF device is conceptualized in order to achieve isobaric pure beams with a higher ion intensity than state-of-the-art MR-ToF devices can provide. Once fully constructed and commissioned, it will operate at an unprecedented ion beam energy of 30 keV. Both of these advances are expected to become important for a wide range of experimental programs pursued at low-energy branches of RIB facilities ranging from fundamental symmetry studies, nuclear structure, rare isotope studies with antimatter, searches of physics beyond the standard model to material science and the production of medical isotopes.
The next-generation MR-ToF mass separator is based on MIRACLS’ 30-keV MR-ToF device for highly sensitive and high-resolution collinear laser spectroscopy. By storing the ions in the Multi Ion Reflection Apparatus for Collinear Laser Spectroscopy (MIRACLS), the same ion bunch is probed by a spectroscopic laser for thousands of times compared to a single passage in traditional collinear laser spectroscopy (CLS). Dedicated simulation studies show that the accuracy and resolution will be close to traditional single-passage CLS while the sensitivity is significantly enhanced. Hence, measurements of nuclear properties via fluorescence-based CLS of very rare radionuclides as well as highly sensitive and high-precision measurements of electron affinities via laser-photodetachment-threshold spectroscopy of negatively-charged (radioactive) ions will become possible.
First measurement campaigns employing MIRACLS’ 1.5-keV MR-ToF device confirm the outstanding boost in signal sensitivity and provide confidence in the application of the MIRACLS technique for the measurement of scarcely produced radioactive ions that have been so far beyond the reach of conventional techniques. Furthermore, the electron affinity of 35Cl was measured, which is in perfect agreement with the literature value. These measurements will serve as important benchmarks for modern atomic and nuclear theory, especially in its description of nuclear charge radii.
In summary, the implementation of Doppler and sympathetic cooling at RIB facilities, the conceptualization of a 30-keV MR-ToF apparatus for highly selective and high-flux mass separation as well as for highly sensitive and high-resolution fluorescence-based laser spectroscopy and the expansion of the MIRACLS technique for the study of negatively-charged ions will enable unprecedented new measurement opportunities at RIB facilities.