adenosine diphosphate/hypoxia

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P2Y₁ and P2Y₁₂ receptors in hypoxia- and adenosine diphosphate-induced pulmonary vasoconstriction in vivo in the pig.

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OBJECTIVE To investigate the role of P2Y₁ and P2Y₁₂ receptors in hypoxia- and adenosine diphosphate (ADP)-induced pulmonary vasoconstriction. METHODS 19 anaesthetized, mechanically ventilated pigs (31.3 ± 0.7 kg) were evaluated in normoxia and hypoxia, without (n = 6) or with P2Y₁ receptor

Expression of p16(INK4A) but not hypoxia markers or poly adenosine diphosphate-ribose polymerase is associated with improved survival in patients with pancreatic adenocarcinoma.

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BACKGROUND Pancreatic cancer is associated with mutations in the tumor suppressor gene cyclin-dependent kinase inhibitor 2A (p16(INK4A) ), a regulator of the cell cycle and apoptosis. This study investigates whether immunohistochemical expression of p16(INK4A) as well as hypoxia markers and poly

[The effect of adenosine triphosphate, adenosine diphosphate, adenosine monophosphate, adenosine and adenine on animal resistance to acute hypoxia].

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Cerebral carbohydrate metabolism during hypoglycemia and anoxia in newborn rats.

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The cerebral metabolic responses to perinatal hypoglycemia and anoxia were studied in newborn rats given regular insulin (30 units per kilogram of body weight). Animals were observed for up to 2 hours with no apparent ill effects in spite of blood glucose concentrations of 0.75 mmol per liter. When

Reversibility of mechanical and biochemical changes in smooth muscle due to anoxia and substrate depletion.

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The effect of temporary glucose and oxygen deprivation on isometric tension as well as content of glycogen, creatine phosphate (CP), adenosine triphosphate (ATP), adenosine diphosphate (ADP), adenosine monophosphate (AMP), and adenylate pool (AP) were studied in potassium-contracted guinea pig

Dietary supplementation of some antioxidants against hypoxia.

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The present study aims to clarify the protective effect of supplementation with some antioxidants, such as idebenone (200 mg/kg, ip), melatonin (10 mg/kg, ip) and arginine (200 mg/kg, ip) and their combination, on liver function (T. protein, albumin, alanine aminotransferase, aspartate

Role of nitric oxide, adenosine, N-methyl-D-aspartate receptors, and neuronal activation in hypoxia-induced pial arteriolar dilation in rats.

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In this study, we tested the hypothesis that nitric oxide (NO) and adenosine (ADO) are the principal mediators of severe hypoxia-induced vasodilation. In addition, we examined whether activation of N-methyl-D-aspartate (NMDA) receptors and/or perivascular nerves plays a role. A closed cranial window

Effect of chemical hypoxia on intracellular ATP and cytosolic Mg2+ levels.

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Intracellular magnesium is intimately associated with adenosine triphosphate (ATP) concentrations and energy utilization. We determined adenine nucleotide concentrations (ATP, adenosine diphosphate, and adenosine triphosphate) and the associated changes in intracellular free Mg2+ ([Mg2+]i) by

Effects of coronary perfusion during myocardial hypoxia. Comparison of metabolic and hemodynamic events with global ischemia and hypoxemia.

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The effects of metabolic accumulation on myocardial metabolism during global heart oxygen deprivation were evaluated in a working in situ swine heart preparation with controlled total coronary blood flow. Myocardial oxygen consumption was depressed to a similar extent by either reducing total

Hypoxic pulmonary vasoconstriction: cyclic adenosine diphosphate-ribose, smooth muscle Ca(2+) stores and the endothelium.

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Hypoxic pulmonary vasoconstriction (HPV) is unique to pulmonary arteries, and supports ventilation/perfusion matching. However, in diseases such as emphysema, HPV can promote hypoxic pulmonary hypertension (HPH), which ultimately leads to right heart failure. Since it was first described, the

31P magnetic resonance spectroscopy of the Sherpa heart: a phosphocreatine/adenosine triphosphate signature of metabolic defense against hypobaric hypoxia.

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Of all humans thus far studied, Sherpas are considered by many high-altitude biomedical scientists as most exquisitely adapted for life under continuous hypobaric hypoxia. However, little is known about how the heart is protected in hypoxia. Hypoxia defense mechanisms in the Sherpa heart were

Effect of hypoxia and glucose deprivation on ATP level, adenylate energy charge and [Ca2+]o-dependent and independent release of [3H]dopamine in rat striatal slices.

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Release of [3H]dopamine ([3H]DA) from rat striatal slices kept under hypoxic or/and glucose-free conditions was measured using a microvolume perfusion method. The corresponding changes in nucleotide content were determined by reverse-phase high-performance liquid chromatography (RPHPLC). The resting

Effects of hypoxia and toxicant exposure on adenylate energy charge and cytosolic ADP concentrations in abalone.

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Many studies have used adenylate energy charge (AEC) as an index of an organism's metabolic state under conditions of imposed stress, either through natural or xenobiotic stressors. AEC is a linear measure of the ratio of ATP concentration to total adenylate concentration, which ranges in value from

Nox2 and Cyclosporine-Induced Renal Hypoxia.

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We hypothesized that nicotinamide adenosine diphosphate oxidase 2 (Nox2) plays an important role in cyclosporine A (CsA)-induced chronic hypoxia. We tested this hypothesis in Fisher 344 rats, C57BL/6 J wild type and Nox2-/- mice, and in liver transplant recipients with chronic CsA nephrotoxicity. We

Chronic hypoxia induces adaptive metabolic changes in neonatal myocardium.

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The effect of chronic hypoxia on neonatal myocardial metabolism remains undefined. With a new neonatal piglet model, we determined changes in myocardial metabolism during global ischemia after chronic hypoxia. Five-day-old piglets (N = 30) were randomly assigned to two groups and exposed to an

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