sorbitol/hypoxia

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The anti-necrosis role of hypoxic preconditioning after acute anoxia is mediated by aldose reductase and sorbitol pathway in PC12 cells.

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It has been demonstrated that hypoxic preconditioning (HP) enhances the survival ability of the organism against the subsequent acute anoxia (AA). However, it is not yet clear whether necrosis induced by AA can be prevented by HP, and what are the underlying mechanisms. In this study, we examined

Effects of sorbitol and lactate on erythropoietin production in HepG2 cells.

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Promotion of erythropoietin (EPO) production is important for erythropoiesis as well as cell viability. The most effective inducing factor for EPO production is hypoxia. Hypoxia inducible factor (HIF), a regulator of EPO production, is increased under hypoxic conditions and is also affected by

Rapid and specific efflux of glutathione before hepatocyte injury induced by hypoxia.

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Hypoxia caused the efflux of glutathione (GSH) from hepatocytes before membrane lysis occurred. Dithiothreitol (DTT), a thiol reductant, greatly increased the hypoxia induced GSH efflux as well as the subsequent membrane lysis. The NADH generating nutrients sorbitol and beta-hydroxybutyrate as well

Halothane hepatotoxicity in hyperthyroid rats as compared to the phenobarbital-hypoxia model.

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Halothane hepatotoxicity was observed after exposing hyperthyroid rats to 0.625% halothane for 4 hr under hypoxic conditions (10% O2). In this model, increases in serum enzyme activities of the alanine aminotransferase (GPT) and the sorbitol dehydrogenase (SDH) were evident immediately following

Elevated glucose levels increase retinal glycolysis and sorbitol pathway metabolism. Implications for diabetic retinopathy.

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OBJECTIVE To assess effects of elevated glucose levels on retinal glycolysis and sorbitol pathway metabolism. METHODS Freshly isolated retinas from normal male Sprague-Dawley rats were incubated for 2 hours at 37 degrees C, pH 7.45, in Krebs bicarbonate-Hepes buffer containing 5, 10, 20, or 30 mM

Modulating hypoxia-induced hepatocyte injury by affecting intracellular redox state.

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Hypoxia-induced hepatocyte injury results not only from ATP depletion but also from reductive stress and oxygen activation. Thus the NADH/NAD+ ratio was markedly increased in isolated hepatocytes maintained under 95% N2/5% CO2 in Krebs-Henseleit buffer well before plasma membrane disruption

Expression of sucrose synthase genes involved in enhanced elongation of pondweed (Potamogeton distinctus) turions under anoxia.

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OBJECTIVE Overwintering buds (turions) of the monocot aquatic pondweed species (Potamogeton distinctus) are highly tolerant to anoxic stress. Sucrose metabolism accompanied by enhanced activity of sucrose synthase (SuSy) operates actively during anaerobic elongation of pondweed turions. The aim of

Poly(ADP-ribose) polymerase inhibitors counteract diabetes- and hypoxia-induced retinal vascular endothelial growth factor overexpression.

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We hypothesize that poly(ADP-ribose) polymerase (PARP) activation is an important mechanism in the oxidative stress-related development of diabetic retinopathy. In the experiments reported here, we evaluated if: a) PARP activation is present in the retina in short-term diabetes; and b) PARP

Anoxia-induced changes in optimal substrate for peripheral nerve.

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Hyperglycemia accentuates the injury produced by anoxia both in the central and peripheral nervous system. To understand whether this is a consequence of changes in metabolic pathways produced by anoxia, the effect of the metabolic substrate used by the rat peripheral nerve on the nerve action

Advanced glycation end products and sorbitol in blood from differently compensated diabetic dogs.

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Canine diabetes mellitus (DM) is a common metabolic disorder with long term complications, most of which are caused by glycosylation of structural proteins, decreases in antioxidant concentrations, altered osmotic balance and hypoxia due to impaired oxygen transport. Previous studies have

Responses to Hypoxia and Endoplasmic Reticulum Stress Discriminate the Development of Vitreous and Floury Endosperms of Conventional Maize (Zea mays) Inbred Lines.

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Major nutritional and agronomical issues relating to maize (Zea mays) grains depend on the vitreousness/hardness of its endosperm. To identify the corresponding molecular and cellular mechanisms, most studies have been conducted on opaque/floury mutants, and recently on Quality Protein Maize, a

Vascular membrane permeability during hypoxia.

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Extracellular space measurements using radioisotope markers (35S-sulphate and 14C-sorbitol) and ultrastructural examination of lanthanum distribution have been carried out on two vascular tissues (aorta, portal vein) exposed to normoxic and hypoxic media to see if hypoxia is associated with membrane

Effect of hypoxia on the metabolism and hepatotoxicity of carbon tetrachloride and vinylidene chloride in rats.

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The metabolism of vinylidene chloride (VDC) and carbon tetrachloride (CCl4) was investigated by measuring the removal of the compounds from the atmosphere of a closed exposure system occupied with male rats. Hepatotoxicity was evidenced in the same rats by determining serum enzyme activities of the

Metabolomics Study of the Effects of Inflammation, Hypoxia, and High Glucose on Isolated Human Pancreatic Islets.

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The transplantation of human pancreatic islets is a therapeutic possibility for a subset of type 1 diabetic patients who experience severe hypoglycemia. Pre- and post-transplantation loss in islet viability and function, however, is a major efficacy-limiting impediment. To investigate the effects of

Osmolyte regulation by TonEBP/NFAT5 during anoxia-recovery and dehydration-rehydration stresses in the freeze-tolerant wood frog (Rana sylvatica).

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BACKGROUND The wood frog, Rana sylvatica, tolerates freezing as a means of winter survival. Freezing is considered to be an ischemic/anoxic event in which oxygen delivery is significantly impaired. In addition, cellular dehydration occurs during freezing because water is lost to extracellular

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