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Page 1 de 172 résultats
Glucose is necessary for stabilization of hypoxia-inducible factor-1alpha under hypoxia: contribution of the pentose phosphate pathway to this stabilization.
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In this study, we observed that low glucose or fructose reduces the increase in hypoxia-inducible factor-1alpha (HIF-1alpha) protein under hypoxic conditions. 6-Aminonicotinamide (6-AN), an inhibitor of the pentose phosphate pathway (PPP), also inhibited the increase of HIF-1alpha protein under
Detection of reactive oxygen species via endogenous oxidative pentose phosphate cycle activity in response to oxygen concentration: implications for the mechanism of HIF-1alpha stabilization under moderate hypoxia.
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The oxidative pentose phosphate cycle (OPPC) is necessary to maintain cellular reducing capacity during periods of increased oxidative stress. Metabolic flux through the OPPC increases stoichiometrically in response to a broad range of chemical oxidants, including those that generate reactive oxygen
Pyruvate Kinase Regulates the Pentose-Phosphate Pathway in Response to Hypoxia in Mycobacterium tuberculosis.
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In response to the stress of infection, Mycobacterium tuberculosis (Mtb) reprograms its metabolism to accommodate nutrient and energetic demands in a changing environment. Pyruvate kinase (PYK) is an essential glycolytic enzyme in the phosphoenolpyruvate-pyruvate-oxaloacetate node that is a central
Elevated pentose phosphate pathway is involved in the recovery of hypoxia‑induced erythrocytosis.
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As a typical model of hypoxia‑induced excessive erythrocytosis, high altitude polycythemia (HAPC) results in microcirculation disturbance, aggravates tissue hypoxia and results in a severe clinical outcome, without any effective intervention methods except for returning to an oxygen‑rich
[Effect of sodium hydroxybutyrate on mitochondrial oxidative phosphorylation and myocardial pentose cycle enzymes during high altitude hypoxia].
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The effect of intraperitoneal administration of sodium hydroxybutyrate on oxidative phosphorylation in mitochondria and on the activity of glucoso-6-phosphate dehydrogenase and 6-phosphogluconate dehydrogenase in the cardiac muscle was studied under alpine conditions (3200 m above the sea level).
Pharmacological HIF1 Inhibition Eliminates Downregulation of the Pentose Phosphate Pathway and Prevents Neuronal Apoptosis in Rat Hippocampus Caused by Severe Hypoxia.
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The pentose phosphate pathway (PPP) of glucose metabolism in the brain serves as a primary source of NADPH which in turn plays a crucial role in multiple cellular processes, including maintenance of redox homeostasis and antioxidant defense. In our model of protective mild hypobaric hypoxia in rats
Hypoxia and oxygenation induce a metabolic switch between pentose phosphate pathway and glycolysis in glioma stem-like cells.
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Fluctuations in oxygen tension during tissue remodeling impose a major metabolic challenge in human tumors. Stem-like tumor cells in glioblastoma, the most common malignant brain tumor, possess extraordinary metabolic flexibility, enabling them to initiate growth even under non-permissive
Hypoxia, coronary dilation, and the pentose phosphate pathway.
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The effect of hypoxia on the pentose phosphate pathway in brain.
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Glucose and Intermediary Metabolism and Astrocyte-Neuron Interactions Following Neonatal Hypoxia-Ischemia in Rat.
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Neonatal hypoxia-ischemia (HI) and the delayed injury cascade that follows involve excitotoxicity, oxidative stress and mitochondrial failure. The susceptibility to excitotoxicity of the neonatal brain may be related to the capacity of astrocytes for glutamate uptake. Furthermore, the neonatal brain
Up-regulation of the pentose phosphate pathway and HIF-1α expression during neural progenitor cell induction following glutamate treatment in rat ex vivo retina.
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The metabolic state influences the regulation of neural stem/progenitor cells. The pentose phosphate pathway (PPP), an alternative metabolic pathway that operates parallel to glycolysis, not only provides key intermediates for biosynthetic reactions but also controls the fate of neural
A possible role of microglia-derived nitric oxide by lipopolysaccharide in activation of astroglial pentose-phosphate pathway via the Keap1/Nrf2 system.
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BACKGROUND
Toll-like receptor 4 (TLR4) plays a pivotal role in the pathophysiology of stroke-induced inflammation. Both astroglia and microglia express TLR4, and endogenous ligands produced in the ischemic brain induce inflammatory responses. Reactive oxygen species (ROS), nitric oxide (NO), and
Expression of fructose 1,6-bisphosphatase and phosphofructokinase is induced in hepatopancreas of the white shrimp Litopenaeus vannamei by hypoxia.
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Marine organisms are exposed to hypoxia in natural ecosystems and during farming. In these circumstances marine shrimp survive and synthesize ATP by anaerobic metabolism. Phosphofructokinase (PFK) and fructose 1,6-bisphosphatase (FBP) are key enzymes in carbohydrate metabolism. Here we report the
Hypoxia promotes relaxation of bovine coronary arteries through lowering cytosolic NADPH.
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Hypoxia relaxes endothelium-denuded bovine coronary arteries (BCA) through mechanisms that do not appear to involve reactive oxygen species, prostaglandins, or nitric oxide. Because of similarities in the relaxation of BCA to hypoxia (Po(2) = 8-10 Torr) and inhibitors of the pentose phosphate
A hypothesis on the pathogenesis of rheumatoid and other non-specific synovitides. IV A. The possible intermediate role of local hypoxia and metabolic alterations.
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According to the original hypothesis, synovial tissue (ST) oedema and synovial fluid (SF) volume increase contribute to local hypoxia and metabolic alterations and to inflammation (A 1). Studies on biochemical mechanisms (A 2) in synovitides show that the SF volume correlates to SF hypoxia that
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