nucleotidase/hypoxia

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5'-Nucleotidase and adenosine deaminase in developing fetal guinea pig brain and the effect of maternal hypoxia.

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The activity of key enzymes of adenosine metabolism was studied in the developing fetal guinea pig brain. The activities of 5'-nucleotidase and adenosine deaminase were determined in the brains of fetal guinea pigs at 30, 35, 40, 45, 50, 55, and 60 days of gestation. The level of 5'-nucleotidase

Role of 5'-nucleotidase in adenosine-mediated renal vasoconstriction during hypoxia.

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Regulation of renal function by endogenous adenosine production was examined in isolated perfused rat kidneys. Reducing perfusate pO2 from 400 +/- 15 to 130 +/- 5 mm Hg for 20 min created an energy deficit and increased adenosine in venous perfusate (0.06 +/- 0.02 to 0.79 +/- 0.15 microM) and

Erythroid pyrimidine 5'-nucleotidase: cloning, developmental expression, and regulation by cAMP and in vivo hypoxia.

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A characteristic process of terminal erythroid differentiation is the degradation of ribosomal RNA into mononucleotides. The pyrimidine mononucleotides can be dephosphorylated by pyrimidine 5'-nucleotidase (P5N-I). In humans, a lack of this enzyme causes hemolytic anemia with ribosomal structures

Activation of ecto-5'-nucleotidase by protein kinase C attenuates irreversible cellular injury due to hypoxia and reoxygenation in rat cardiomyocytes.

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Adenosine, synthesized by ecto-5'-nucleotidase, is cardioprotective against ischemia and reperfusion injury. We have previously reported that activation of protein kinase C increases ecto-5'-nucleotidase activity of the rat cardiomyocytes, raising the possibility that activation of protein kinase C

Myocardial adenosine formation during hypoxia: effects of ecto-5'-nucleotidase inhibition.

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Release of adenosine and AMP into epicardial fluid and coronary venous effluent of isovolumic guinea-pig hearts was examined during normoxic (95% O2) and hypoxic (30% O2) perfusion with and without the ecto-5'-nucleotidase inhibitor alpha,beta-methylene adenosine diphosphate (AOPCP)*. Normoxic

Effect of hypoxia/reoxygenation on CD73 (ecto-5'-nucleotidase) in mouse microvessel endothelial cell lines.

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Cerebral ischemia and post-ischemic reperfusion commonly result in significant brain damage. Brain microvessel endothelial cells, the key target cells and regulating sites, can secrete adenosine which plays an important neuroprotective role in the ischemic brain. A primary determinant of localized

Hypoxia enhances Ecto-5'-Nucleotidase activity and cell surface expression in endothelial cells: role of membrane lipids.

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Extracellular adenosine production by the glycosyl-phosphatidyl-inositol-anchored Ecto-5'-Nucleotidase plays an important role in the defense against hypoxia, particularly in the intravascular space. The present study was designed in order to elucidate the mechanisms underlying hypoxia-induced

Ecto-5'-nucleotidase (CD73) regulation by hypoxia-inducible factor-1 mediates permeability changes in intestinal epithelia.

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Under conditions of limited oxygen availability (hypoxia), multiple cell types release adenine nucleotides in the form of ATP, ADP, and AMP. Extracellular AMP is metabolized to adenosine by surface-expressed ecto-5'-nucleotidase (CD73) and subsequently activates surface adenosine receptors

Ecto-5'-nucleotidase (CD73) regulates peripheral chemoreceptor activity and cardiorespiratory responses to hypoxia.

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CONCLUSIONS Carotid body dysfunction is recognized as a cause of hypertension in a number of cardiorespiratory diseases states and has therefore been identified as a potential therapeutic target. Purinergic transmission is an important element of the carotid body chemotransduction pathway. We show

Hypoxia-inducible factor-1α-dependent protection from intestinal ischemia/reperfusion injury involves ecto-5'-nucleotidase (CD73) and the A2B adenosine receptor.

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Intestinal ischemia/reperfusion injury (IR) is characterized by intermittent loss of perfusion to the gut, resulting in dramatic increases in morbidity and mortality. Based on previous studies indicating an anti-inflammatory role for hypoxia-inducible factor (HIF)-1-elicited enhancement of

Crucial role for ecto-5'-nucleotidase (CD73) in vascular leakage during hypoxia.

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Extracellular adenosine has been widely implicated in adaptive responses to hypoxia. The generation of extracellular adenosine involves phosphohydrolysis of adenine nucleotide intermediates, and is regulated by the terminal enzymatic step catalyzed by ecto-5'-nucleotidase (CD73). Guided by previous

[Behavior of histochemically detected alkaline phosphatase and 5-nucleotidase in oxygen deficiency and renal infarction].

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Retraction: Hypoxia-Inducible Factor-1α-Dependent Protection from Intestinal Ischemia/Reperfusion Injury Involves Ecto-5'-Nucleotidase (CD73) and the A2B Adenosine Receptor.

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[Effect of melatonin and epithalamin on activity of marker enzymes in the cell membrane in the forebrain of rats under acute hypoxia].

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The effects of a single-shot intraperitoneally administration of melatonin in a dose of 1 mg per kg body weight and epithalamin in a dose of 2.5 mg per kg body weight on the activities of Na+, K(+)-ATPase and 5'-nucleotidase were investigated in the forebrain of juvenile male white rats under the

Hypoxia induces adenosine release from the rat carotid body.

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The effect of hypoxia on the release of adenosine was studied in vitro in the rat whole carotid body (CB) and compared with the effect of hypoxia (2%, 5% and 10% O(2)) on adenosine concentrations in superior cervical ganglia (SCG) and carotid arteries. Moderate hypoxia (10% O(2)) increased adenosine

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