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Página 1 a partir de 170 resultados
Inosine, not adenosine, initiates endothelial glycocalyx degradation in cardiac ischemia and hypoxia.
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Ischemia/reperfusion and hypoxia/reoxygenation of the heart both induce shedding of the coronary endothelial glycocalyx. The processes leading from an oxygen deficit to shedding are unknown. An involvement of resident perivascular cardiac mast cells has been proposed. We hypothesized that either
Inosine released after hypoxia activates hepatic glucose liberation through A3 adenosine receptors.
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Inosine, an endogenous nucleoside, has recently been shown to exert potent effects on the immune, neural, and cardiovascular systems. This work addresses modulation of intermediary metabolism by inosine through adenosine receptors (ARs) in isolated rat hepatocytes. We conducted an in silico search
A comparison of AMP degradation in the perfused rat heart during 2-deoxy-D-glucose perfusion and anoxia. Part I: The release of adenosine and inosine.
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AMP degradation is studied in two models of the Langendorff-perfused rat heart which generate a large release of purines: the 2-deoxy-D-glucose (2DG)-perfused heart and the anoxic heart. In the 2DG model, mitochondrial energy generation is quasi-normal, despite a very low ATP concentration.
The measurement of hypoxanthine, xanthine, inosine and uridine in umbilical cord blood and fetal scalp blood samples as a measure of fetal hypoxia.
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Hypoxanthine, xanthine, inosine, urate and uridine, were measured in 149 samples of umbilical cord plasma using high pressure liquid chromatography. In spite of a good correlation with the simpler oxygen consumption method for measuring hypoxanthine, there was no clear discrimination between hypoxic
Effects of inosine on response to in vitro hypoxia in absence of substrate on bladder dysfunction in adult rats.
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OBJECTIVE
To investigate the effects of inosine on in vitro ischemia-reperfusion injury to urinary bladders in adult rats. Inosine has neuroprotective effects against cerebral and cardiac ischemia-reperfusion injury.
METHODS
A total of 18 adult male rats were used. Each rat was anesthetized, and the
Avian vitreous humor concentrations of inosine, hypoxanthine, xanthine, uric acid, uracil and uridine as influenced by age and sex: their relevance as indicators of ante-mortem hypoxia.
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An investigation was made to determine the effects of age and sex on postmortem concentrations (mumol/l) of inosine, hypoxanthine, xanthine, uric acid, uracil and uridine in the vitreous humor of chickens (Gallus domesticus). Five male and 5 female chickens were sampled each week from 0-10 weeks of
The protective effects of inosine against chemical hypoxia on cultured rat oligodendrocytes.
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Inosine is a purine nucleoside and is considered protective to neural cells including neurons and astrocytes against hypoxic injury. However, whether oligodendrocytes (OLs) could also be protected from hypoxia by inosine is not known. Here we investigated the effects of inosine on primarily cultured
Adenosine and inosine release during hypoxia in the isolated spinal cord of neonatal rats.
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OBJECTIVE
Adenosine and inosine accumulate extracellularly during hypoxia/ischaemia in the brain and may act as neuroprotectants. In spinal cord, there is pharmacological evidence for increases in extracellular adenosine during hypoxia, but no direct measurements of purine release. Furthermore, the
Radioprotective effect of inosine and its enhancement by magnesium and global hypoxia.
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The slight radioprotective action of inosine, when injected intraperitoneally to mice shortly before gamma-irradiation, can be enhanced by the administration of magnesium aspartate. This effect can be explained by the additivity of the vasodilatory actions of both agents. Inosine increases the
Increases in cerebral cortical perfusate adenosine and inosine concentrations during hypoxia and ischemia.
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The cerebral cortical cup technique was used to monitor changes in adenosine and inosine levels in the rat cerebral cortex during periods of hypoxia, anoxia, or hemorrhagic hypotension. Basal levels of adenosine and inosine in cortical perfusates stabilized within 10 min at concentrations of 30-50
The protective action of inosine on isolated arteries in hypoxia.
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1 The pressor responses to injected noradrenaline (NA) of isolated perfused femoral or renal arteries of the rabbit were studied.2 Vascular smooth muscle is relatively resistant to hypoxia. A combination of hypoxia and dinitrophenol (DNP) respiratory uncoupling was necessary to abolish the pressor
Release of adenosine, inosine and hypoxanthine from the isolated guinea pig heart during hypoxia, flow-autoregulation and reactive hyperemia.
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In an attempt to test the hypothesis whether adenosine is involved in the regulation of coronary flow adenosine, inosine and hypoxanthine were measured in the effluent perfusate and in the tissue of isolated guinea pig hearts under various experimental conditions. In addition, the release of
Cerebrospinal fluid concentrations of hypoxanthine, xanthine, uridine and inosine: high concentrations of the ATP metabolite, hypoxanthine, after hypoxia.
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CSF obtained for clinical purposes from newborn, children and adults has been analysed by high pressure liquid chromatography for hypoxanthine, xanthine, inosine, uridine and urate. Large rises in hypoxanthine and to a lesser extent xanthine occur for about 24 h after hypoxia. High concentrations
Inosine and guanosine preserve neuronal and glial cell viability in mouse spinal cord cultures during chemical hypoxia.
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Murine spinal cord primary mixed cultures were treated with the respiratory inhibitor, rotenone, to mimic hypoxic conditions. Under these conditions neurons rapidly underwent oncosis (necrosis) with a complete loss in viability occurring within 260 min; however, astrocytes, which accounted for most
[Inotropic effects of inosine on the isolated rabbit heart in hypoxia].
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