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Liver diseases are important causes of morbidity and mortality worldwide. The aim of
this study was to identify differentially expressed microRNAs (miRNAs), target genes, and key
pathways as innovative diagnostic biomarkers in liver patients with different pathology and functional
state. We determined, using RT-qPCR, the expression of 472 miRNAs in 125 explanted livers from
subjects with six different liver pathologies and from control livers. ANOVA was employed to
obtain differentially expressed miRNAs (DEMs), and miRDB (MicroRNA target prediction database)
was used to predict target genes. A miRNA–gene differential regulatory (MGDR) network was
constructed for each condition. Key miRNAs were detected using topological analysis. Enrichment
analysis for DEMs was performed using the Database for Annotation, Visualization, and Integrated
Discovery (DAVID). We identified important DEMs common and specific to the different patient
groups and disease progression stages. hsa-miR-1275 was universally downregulated regardless
the disease etiology and stage, while hsa-let-7a*, hsa-miR-195, hsa-miR-374, and hsa-miR-378 were
deregulated. The most significantly enriched pathways of target genes controlled by these miRNAs
comprise p53 tumor suppressor protein (TP53)-regulated metabolic genes, and those involved in
regulation of methyl-CpG-binding protein 2 (MECP2) expression, phosphatase and tensin homolog
(PTEN) messenger RNA (mRNA) translation and copper homeostasis. Our findings show a novel
panel of deregulated miRNAs in the liver tissue from patients with different liver pathologies. These
miRNAs hold potential as biomarkers for diagnosis and staging of liver diseases.
Hepatocellular carcinoma (HCC) is a deadly form of liver malignancy with limited treatment
options. Amplification and/or overexpression of c-MYC is one of the most frequent genetic events
in human HCC. The mammalian target of Rapamycin Complex 1 (mTORC1) is a major functional
axis regulating various aspects of cellular growth and metabolism. Recently, we demonstrated that
mTORC1 is necessary for c-Myc driven hepatocarcinogenesis as well as for HCC cell growth in vitro.
Among the pivotal downstream effectors of mTORC1, upregulation of Fatty Acid Synthase (FASN) and
its mediated de novo lipogenesis is a hallmark of human HCC. Here, we investigated the importance
of FASN on c-Myc-dependent hepatocarcinogenesis using in vitro and in vivo approaches. In mouse
and human HCC cells, we found that FASN suppression by either gene silencing or soluble inhibitors
more effectively suppressed proliferation and induced apoptosis in the presence of high c-MYC
expression. In c-Myc/Myeloid cell leukemia 1 (MCL1) mouse liver tumor lesions, FASN expression
was markedly upregulated. Most importantly, genetic ablation of Fasn profoundly delayed (without
abolishing) c-Myc/MCL1 induced HCC formation. Liver tumors developing in c-Myc/MCL1 mice
depleted of Fasn showed a reduction in proliferation and an increase in apoptosis when compared
with corresponding lesions from c-Myc/MCL1 mice with an intact Fasn gene. In human HCC samples,
a significant correlation between the levels of c-MYC transcriptional activity and the expression
of FASN mRNA was detected. Altogether, our study indicates that FASN is an important effector
downstream of mTORC1 in c-MYC induced HCC. Targeting FASN may be helpful for the treatment
of human HCC, at least in the tumor subset displaying c-MYC amplification or activation.
Despite continuous advances in therapy, malignant melanoma is still among the deadliest
types of cancer. At the same time, owing to its high plasticity and immunogenicity, melanoma is
regarded as a model tumor entity when testing new treatment approaches. Cold physical plasma is a
novel anticancer tool that utilizes a plethora of reactive oxygen species (ROS) being deposited on the
target cells and tissues. To test whether plasma treatment would enhance the toxicity of an established
antitumor therapy, ionizing radiation, we combined both physical treatment modalities targeting
B16F10 murine melanoma cell in vitro. Repeated rather than single radiotherapy, in combination
with gas plasma-introduced ROS, induced apoptosis and cell cycle arrest in an additive fashion. In
tendency, gas plasma treatment sensitized the cells to subsequent radiotherapy rather than the other
way around. This was concomitant with increased levels of TNFα, IL6, and GM-CSF in supernatants.
Murine JAWS dendritic cells cultured in these supernatants showed an increased expression of cell
surface activation markers, such as MHCII and CD83. For PD-L1 and PD-L2, increased expression
was observed. Our results are the first to suggest an additive therapeutic effect of gas plasma and
radiotherapy, and translational tumor models are needed to develop this concept further.
Background: Cold atmospheric plasma (CAP) is increasingly used in the field of oncology.
Many of the mechanisms of action of CAP, such as inhibiting proliferation, DNA breakage, or the
destruction of cell membrane integrity, have been investigated in many different types of tumors.
In this regard, data are available from both in vivo and in vitro studies. Not only the direct treatment
of a tumor but also the influence on its blood supply play a decisive role in the success of the therapy
and the patient’s further prognosis. Whether the CAP influences this process is unknown, and the
first indications in this regard are addressed in this study. Methods: Two different devices, kINPen
and MiniJet, were used as CAP sources. Human endothelial cell line HDMEC were treated directly
and indirectly with CAP, and growth kinetics were performed. To indicate apoptotic processes,
caspase-3/7 assay and TUNEL assay were used. The influence of CAP on cellular metabolism
was examined using the MTT and glucose assay. After CAP exposure, tube formation assay was
performed to examine the capillary tube formation abilities of HDMEC and their migration was
messured in separate assays. To investigate in a possible mutagenic effect of CAP treatment,
a hypoxanthine-guanine-phosphoribosyl-transferase assay with non malignant cell (CCL-93) line was
performed. Results: The direct CAP treatment of the HDMEC showed a robust growth-inhibiting
effect, but the indirect one did not. The MMT assay showed an apparent reduction in cell metabolism
in the first 24 h after CAP treatment, which appeared to normalize 48 h and 72 h after CAP application.
These results were also confirmed by the glucose assay. The caspase 3/7 assay and TUNEL assay
showed a significant increase in apoptotic processes in the HDMEC after CAP treatment. These results
were independent of the CAP device. Both the migration and tube formation of HDMEC were
significant inhibited after CAP-treatment. No malignant effects could be demonstrated by the CAP
treatment on a non-malignant cell line.
Niemann–Pick type C1 (NPC1) is a lysosomal storage disorder, inherited as an
autosomal-recessive trait. Mutations in the Npc1 gene result in malfunction of the NPC1 protein,
leading to an accumulation of unesterified cholesterol and glycosphingolipids. Beside visceral
symptoms like hepatosplenomegaly, severe neurological symptoms such as ataxia occur. Here,
we analyzed the sphingosine-1-phosphate (S1P)/S1P receptor (S1PR) axis in different brain regions
of Npc1−/− mice and evaluated specific effects of treatment with 2-hydroxypropyl-β-cyclodextrin
(HPβCD) together with the iminosugar miglustat. Using high-performance thin-layer chromatography
(HPTLC), mass spectrometry, quantitative real-time PCR (qRT-PCR) and western blot analyses, we
Int. J. Mol. Sci. 2020, 21, 4502; doi:10.3390/ijms21124502 www.mdpi.com/journal/ijms
Int. J. Mol. Sci. 2020, 21, 4502 2 of 31
studied lipid metabolism in an NPC1 mouse model and human skin fibroblasts. Lipid analyses
showed disrupted S1P metabolism in Npc1−/− mice in all brain regions, together with distinct changes
in S1pr3/S1PR3 and S1pr5/S1PR5 expression. Brains of Npc1−/− mice showed only weak treatment
effects. However, side effects of the treatment were observed in Npc1+/+ mice. The S1P/S1PR axis
seems to be involved in NPC1 pathology, showing only weak treatment effects in mouse brain. S1pr
expression appears to be affected in human fibroblasts, induced pluripotent stem cells (iPSCs)-derived
neural progenitor and neuronal differentiated cells. Nevertheless, treatment-induced side effects
make examination of further treatment strategies indispensable
Molecular Mechanisms of Bortezomib Action: Novel Evidence for the miRNA−mRNA Interaction Involvement
(2020)
Bortezomib is an anti-tumor agent, which inhibits 26S proteasome degrading ubiquitinated
proteins. While apoptotic transcription-associated activation in response to bortezomib has been
suggested, mechanisms related to its influence on post-transcriptional gene silencing mediated
regulation by non-coding RNAs remain not fully elucidated. In the present study, we examined
changes in global gene and miRNA expression and analyzed the identified miRNA–mRNA interactions
after bortezomib exposure in human neuroblastoma cells to define pathways affected by this agent in
this type of cells. Cell viability assays were performed to assess cytotoxicity of bortezomib. Global gene
and miRNA expression profiles of neuroblastoma cells after 24-h incubation with bortezomib were
determined using genome-wide RNA and miRNA microarray technology. Obtained results were
then confirmed by qRT-PCR and Western blot. Further bioinformatical analysis was performed
to identify affected biological processes and pathways. In total, 719 genes and 28 miRNAs were
downregulated, and 319 genes and 61 miRNAs were upregulated in neuroblastoma cells treated with
bortezomib. Possible interactions between dysregulated miRNA/mRNA, which could be linked to
bortezomib-induced neurotoxicity, affect neurogenesis, cellular calcium transport, and neuron death.
Bortezomib might exert toxic effects on neuroblastoma cells and regulate miRNA–mRNA interactions
influencing vital cellular functions. Further studies on the role of specific miRNA–mRNA interactions
are needed to elucidate mechanisms of bortezomib action.
Injection of intense low-energy reactor-based positron beams into a supported magnetic dipole trap
(2020)
Abstract
An increased low-energy positron flux is obtained from the reactor based NEPOMUC source when using its primary beam at energies as low as 20 eV. First experiments with this beam in a supported magnetic dipole trap resulted in the maximum current of injected positrons to date. According to single-particle simulations, remaining limitations in the injection efficiency, observed in the experiment, can be attributed to the spatial spread of the beam. In the first trapping measurements with this beam, top-down asymmetries in the electrostatic trapping potential are found to be detrimental to confinement.
AbstractFluctuations of electron cyclotron emission (ECE) signals are analyzed for differently heated Wendelstein 7-X plasmas. The fluctuations appear to travel predominantly on flux surfaces and are used as ‘tracers’ in multivariate time series. Different statistical techniques are assessed to reveal the coupling and information entropy-based coupling analysis are conducted. All these techniques provide evidence that the fluctuation analysis allows one to check the consistency of magneto-hydrodynamic (MHD) equilibrium calculations. Expanding the suite of techniques applied in fusion data analysis, partial mutual information (PMI) analysis is introduced. PMI generalizes traditional partial correlation (Frenzel and Pompe Phys. Rev. Lett.
99 204101) and also Schreiber’s transfer entropy (Schreiber 2000 Phys. Rev. Lett.
85 461). The main additional capability of PMI is to allow one to discount for specific spurious data. Since PMI analysis allows one to study the effect of common drivers, the influence of the electron cyclotron resonance heating on the mutual dependencies of simultaneous ECE measurements was assessed. Additionally, MHD mode activity was found to be coupled in a limited volume in the plasma core for different plasmas. The study reveals an experimental test for equilibrium calculations and ECE radiation transport.
AbstractUsing measurements from high resolution monitoring of radial tree-growth we present new data of the growth reactions of four widespread broadleaved tree-species to the combined European drought years 2018 and 2019. We can show that, in contrast to field crops, trees could make better use of the winter soil moisture storage in 2018 which buffered them from severe drought stress and growth depressions in this year. Nevertheless, legacy effects of the 2018 drought accompanied by sustained low soil moisture conditions (missing recharge in winter) and again higher than average temperatures and low precipitation in spring/summer 2019 have resulted in severe growth reductions for all studied tree-species in this year. This highlights the pivotal role of soil water recharge in winter. Although short term resistance to hot summers can be high if sufficient winter precipitations buffers forest stands from drought damage, legacy effects will strongly impact tree growth in subsequent years if the drought persists. The two years 2018 and 2019 are extreme with regard to historical instrumental data but, according to regional climate models, resemble rather normal conditions of the climate in the second half of the 21st century. Therefore the observed strongly reduced growth rates can provide an outlook on future forest growth potential in northern Central Europe and beyond.
Disregarded Measurement Uncertainty Contributions and Their Magnitude in Measuring Plasma Glucose
(2020)
Background:
Each measurement is subject to measurement uncertainty (MU). Consequently, each measurement of plasma glucose concentration used for diagnosis and monitoring of diabetes mellitus (DM) is affected. Although concepts and methods of MU are well established in many fields of science and technology, they are presently only incompletely implemented by medical laboratories, neglecting MU of target values of internal quality control (IQC) materials.
Methods:
An empirical and practical approach for the estimation of MU based on the analysis of routine IQC using control samples with assigned target values is presented. Its feasibility is demonstrated exemplarily by analyzing IQC data from one year obtained for glucose employing the hexokinase method with IQC of two different concentrations.
Results:
Combined relative extended (k = 2) MU comprising bias, coefficient of variation (CV), and MU of the target values assigned to control materials were about 9% with a lower (~ 56 mg/dL; ~3.1 mmol/L) and 8% with a higher (~ 346 mg/dL; ~19.2 mmol/L) concentration sample, analyzing IQC of one year from three different devices.
Conclusions:
Estimation of MU in this study is quite reliable due to the large number of IQC data from one year. The MU of the target values of the commercial control material in this study was considerably larger than other MU contributions, ie, standard deviation and bias. In the future, the contribution of MU of commercial IQC should be addressed more carefully and technologies to measure glucose should be geared toward smaller MU possible, as needed, especially for glucose concentration measurements in diagnosis and management of DM.