14 research outputs found
Major distinctions in the antioxidant responses in liver and kidney of Cd2+-treated common carp (Cyprinus carpio)
Novel Pathogenic PRSS1 Variant p.Glu190Lys in a Case of Chronic Pancreatitis
Mutations in the PRSS1 (serine protease 1) gene encoding human cationic trypsinogen cause hereditary pancreatitis or may be associated with sporadic chronic pancreatitis. The mutations exert their pathogenic effect either by increasing intra-pancreatic trypsinogen activation (trypsin pathway) or by causing proenzyme misfolding and endoplasmic reticulum stress (misfolding pathway). Here we report a novel heterozygous c.568G>A (p.Glu190Lys) variant identified in a case with chronic pancreatitis. The parents of the index patient had no history of pancreatitis but were unavailable for genetic testing. Functional characterization revealed 2.5-fold increased autoactivation of the mutant trypsinogen relative to wild type. Unlike many other clinically relevant PRSS1 mutations, p.Glu190Lys did not alter the chymotrypsin C (CTRC)-dependent degradation of trypsinogen nor did it increase CTRC-mediated processing of the trypsinogen activation peptide. Cellular secretion of the mutant protein was unchanged indicating normal folding behavior. Based on the genetic and functional evidence, we classify the p.Glu190Lys PRSS1 variant as likely pathogenic, which stimulates autoactivation of cationic trypsinogen independently of CTRC
Az oxidat铆v stressz 茅s az antioxid谩ns v茅delmi rendszer vizsg谩lata neh茅zf茅m kezel茅st k枚vet艖en pontyban 茅s streptozotocin-induk谩lta diab茅teszes patk谩ny modellben
Gut region-specific accumulation of reactive oxygen species leads to regionally distinct activation of antioxidant and apoptotic marker molecules in rats with STZ-induced diabetes
The pollution of the soils, the underground and surface waters, from Hungarian-Romanian cross-border area
Electrophysiological and biochemical response in rats on intratracheal instillation of manganese
Abstract
Chronic exposure to excess manganese via inhalation of metal fumes causes central nervous system damage. For modelling Mn aerosol inhalation, male Wistar rats were intratracheally instilled with MnCl2 solution (0.5 mg/kg b.w. MnCl2; n=12) 5 days a week for 5 weeks. At the end of the treatment, somatosensory cortical evoked potentials, elicited by double-pulse stimulation, were recorded from the animals in urethane anaesthesia. Body weight gain, organ weights, and Mn level in brain, lung and blood samples were also measured. In brain samples, gene expression level of MnSOD (Mn superoxide dismutase) was determined. The effect of Mn was mainly seen on the evoked potential amplitudes, and on the second:first ratio of these. Tissue Mn concentration was elevated in brain and lungs, but changed hardly in the blood. Relative weight of heart, thymus, lungs and brain was significantly altered. The level of MnSOD transcript in brain tissue decreased. The observed effects showed that Mn had access to the brain and that somatosensory cortical responses evoked by double-pulse stimulation might be suitable biomarkers of Mn intoxication.</jats:p
Effects of Kupffer cell blockade on the hepatic expression of metallothionein and heme oxygenase genes in endotoxemic rats with obstructive jaundice
Gut region-specific rearrangement of the cellular and subcellular compartments of nitric oxide synthase isoforms after chronic ethanol consumption in rats
Gut region-specific rearrangement of the cellular and subcellular compartments of nitric oxide synthase isoforms after chronic ethanol consumption in rats
We recently provided evidence of cell-typespecific differences in the subcellular distributions of the
three nitric oxide synthase (NOS) isoforms in the
myenteric neurons, enteric smooth muscle cells and the
capillary endothelium of the rat duodenum. We
hypothesized that the presence of three NOS isoforms in
the same type of cells with differences in subcellular
compartmentalization might reflect a functional
plasticity. Therefore, investigation of the possible
rearrangement of cellular and subcellular NOS
compartments in different gut segments following
chronic ethanol treatment was the aim of this study.
Rats were randomly divided into two groups and
received water or 20% ethanol solution, preceded by
short periods of adaptation with 10% and 15% ethanol.
After 8 weeks, segments of duodenum, ileum and colon
of the control and the alcohol-treated rats were processed
for post-embedding immunohistochemistry and RT-PCR.
The quantitative differences in the numbers of gold
particles indicative of the different NOSs and their
relative mRNA levels between the two experimental
groups varied greatly, depending on the gut segment, and
also on the cellular and subcellular compartments
investigated. The chronic ethanol administration had the
opposite effect on the quantitative distribution of the
neuronal and endothelial NOS labelling gold particles in
the different cellular compartments and resulted in
subcellular rearrangement of NOS labels along the
gastrointestinal tract.
The intestinal region-specific rearrangement of the
cellular and subcellular NOS compartments may
possibly result in functional plasticity and help to
maintain the optimum NO level under pathological
conditions