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Publisher
- MDPI (37) (remove)
Climate Change-Induced Shift of Tree Growth Sensitivity at a Central Himalayan Treeline Ecotone
(2018)
Planning Modes for Major Transportation Infrastructure Projects (MTIPs): Comparing China and Germany
(2018)
Production-Integrated Compensation in Environmental Offsets—A Review of a German Offset Practice
(2018)
Biocidal Agents Used for Disinfection Can Enhance Antibiotic Resistance in Gram-Negative Species
(2018)
For the last two decades, heparins have been widely used as anticoagulants. Besides
numerous advantages, up to 5% patients with heparin administration suffer from a major adverse
drug effect known as heparin-induced thrombocytopenia (HIT). This typical HIT can result in deep
vein thrombosis, pulmonary embolism, occlusion of a limb artery, acute myocardial infarct, stroke, and
a systemic reaction or skin necrosis. The basis of HIT may lead to clinical insights. Recent studies using
single-molecule force spectroscopy (SMFS)-based atomic force microscopy revealed detailed binding
mechanisms of the interactions between platelet factor 4 (PF4) and heparins of different lengths in
typical HIT. Especially, SMFS results allowed identifying a new mechanism of the autoimmune HIT
caused by a subset of human-derived antibodies in patients without heparin exposure. The findings
proved that not only heparin but also a subset of antibodies induce thrombocytopenia. In this review,
the role of SMFS in unraveling a major adverse drug effect and insights into molecular mechanisms
inducing thrombocytopenia by both heparins and antibodies will be discussed.
Sphingosine-1-phosphate (S1P) regulates the migration of follicular B cells
(B2 cells) and directs the positioning of Marginal zone B cells (MZ B cells) within the spleen. The
function of S1P signalling in the third B cell lineage, B1 B cells, mainly present in the pleural and
peritoneal cavity, has not yet been determined. Methods: S1P receptor expression was analysed
in peritoneal B cells by real-time polymerase chain reaction (qPCR). The chemotactic response to
S1P was studied in vitro. The role of S1P signalling was further explored in a s1p4
−/− mouse
strain. Results: Peritoneal B cells expressed considerable amounts of the S1P receptors 1 and 4
(S1P1 and S1P4, respectively). S1P1 showed differential expression between the distinct peritoneal B
cell lineages. While B2 cells showed no chemotactic response to S1P, B1 B cells showed a migration
response to S1P. s1p4
−/− mice displayed significant alterations in the composition of peritoneal
B cell populations, as well as a significant reduction of mucosal immunoglobulin A (IgA) in the
gut. Discussion: S1P signalling influences peritoneal B1 B cell migration. S1P4 deficiency alters the
composition of peritoneal B cell populations and reduces secretory IgA levels. These findings suggest
that S1P signalling may be a target to modulate B cell function in inflammatory intestinal pathologies.
on-healing wounds continue to be a clinical challenge for patients and medical staff.
These wounds have a heterogeneous etiology, including diabetes and surgical trauma wounds. It is
therefore important to decipher molecular signatures that reflect the macroscopic process of wound
healing. To this end, we collected wound sponge dressings routinely used in vacuum assisted therapy
after surgical trauma to generate wound-derived protein profiles via global mass spectrometry.
We confidently identified 311 proteins in exudates. Among them were expected targets belonging to
the immunoglobulin superfamily, complement, and skin-derived proteins, such as keratins. Next to
several S100 proteins, chaperones, heat shock proteins, and immune modulators, the exudates
presented a number of redox proteins as well as a discrete neutrophil proteomic signature, including
for example cathepsin G, elastase, myeloperoxidase, CD66c, and lipocalin 2. We mapped over 200
post-translational modifications (PTMs; cysteine/methionine oxidation, tyrosine nitration, cysteine
trioxidation) to the proteomic profile, for example, in peroxiredoxin 1. Investigating manually
collected exudates, we confirmed presence of neutrophils and their products, such as microparticles
and fragments containing myeloperoxidase and DNA. These data confirmed known and identified
less known wound proteins and their PTMs, which may serve as resource for future studies on
human wound healing
: An enhanced indoleamine 2,3-dioxygenase 1 (IDO1) activity is associated with an increased
mortality risk in sepsis patients. Thus, the preventive inhibition of IDO1 activity may be
a promising strategy to attenuate the severity of septic shock. 1-methyltryptophan (1-MT)
is currently in the interest of research due to its potential inhibitory effects on IDO1 and
immunomodulatory properties. The present study aims to investigate the protective and
immunomodulatory effects of 1-methyltryptophan against endotoxin-induced shock in a porcine
in vivo model. Effects of 1-MT were determined on lipopolysaccharide (LPS)-induced tryptophan
(TRP) degradation, immune response and sickness behaviour. 1-MT increased TRP and its metabolite
kynurenic acid (KYNA) in plasma and tissues, suppressed the LPS-induced maturation of neutrophils
and increased inactivity of the animals. 1-MT did not inhibit the LPS-induced degradation of TRP
to kynurenine (KYN)—a marker for IDO1 activity—although the increase in KYNA indicates that
degradation to one branch of the KYN pathway is facilitated. In conclusion, our findings provide
no evidence for IDO1 inhibition but reveal the side effects of 1-MT that may result from the proven
interference of KYNA and 1-MT with aryl hydrocarbon receptor signalling. These effects should be
considered for therapeutic applications of 1-MT.