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nucleotidase/infarction
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Infarct size-limiting effect of ischemic preconditioning is blunted by inhibition of 5'-nucleotidase activity and attenuation of adenosine release.
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BACKGROUND
We have previously reported that ischemic preconditioning increases 5'-nucleotidase activity and adenosine release during ischemia and reperfusion. However, its direct cause-and-effect relation has not been proven. To test the idea that the infarct size-limiting effect of ischemic
[Dynamics of 5'-nucleotidase activity in the blood plasma in experimental myocardial infarct].
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The authors studied in the bloodflow the appearance of the damaged external cellular membranes of the heart during the development of experimental myocardial infarction. The appearance of the external cellular membranes was judged by the activity of their specific marked 51-nucleotidase. It was
Role of activation of protein kinase C in the infarct size-limiting effect of ischemic preconditioning through activation of ecto-5'-nucleotidase.
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BACKGROUND
We have reported previously that ischemic preconditioning limits infarct size by increasing ecto-5'-nucleotidase activity. Since we have also reported that protein kinase C activation increases ecto-5'-nucleotidase activity in rat cardiomyocytes, we tested whether activation of protein
AMP deaminase, 5'-nucleotidase and adenosine deaminase in rat myocardial tissue in myocardial infarction and hypothermia.
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AMP deaminase, 5'-nucleotidase and adenosine deaminase have been estimated in skeletal muscle and myocardial tissue in normal rats and in rats subjected to experimental myocardial infarction or hypothermia. A difference in the enzyme distribution was found between the right and left ventricles in
Ecto-5'-nucleotidase mediates infarct size-limiting effect by ischemic preconditioning in the rabbit heart.
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We examined whether ecto-5'-nucleotidase mediates infarct limitation by ischemic preconditioning in the rabbit heart. Ecto-5'-nucleotidase activity in ischemic region after ischemic preconditioning was greater than that in nonischemic regions (23.6 +/- 2.5 vs. 13.6 +/- 1.0 nmol/mg protein/min; p <
Alpha 1-adrenoceptor activation mediates the infarct size-limiting effect of ischemic preconditioning through augmentation of 5'-nucleotidase activity.
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We have reported that ischemic preconditioning may limit infarct size by increasing 5'-nucleotidase activity. The present study tested whether alpha 1-adrenoceptor stimulation in ischemic preconditioning mediates the infarct size-limiting effect through augmentation of 5'-nucleotidase activity. The
Optimal windows of statin use for immediate infarct limitation: 5'-nucleotidase as another downstream molecule of phosphatidylinositol 3-kinase.
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BACKGROUND
Although statins are reported to have a cardioprotective effect, their immediate direct influence on ischemia-reperfusion injury and the underlying mechanisms remain obscure. We investigated these issues an in vivo canine model.
RESULTS
Dogs were subjected to coronary occlusion (90
Serial serum 5'-nucleotidase and S.G.O.T. levels in acute myocardial infarction.
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[Behavior of histochemically detected alkaline phosphatase and 5-nucleotidase in oxygen deficiency and renal infarction].
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Cardioprotection due to preconditioning correlates with increased ecto-5'-nucleotidase activity.
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We investigated whether loss of myocardial protection after ischemic preconditioning (IP) is related to the extent of deactivation of activated ecto-5'-nucleotidase. The coronary arteries of mongrel dogs were occluded four times for 5 min separated by 5 min of reperfusion (IP). Five (IP1), 30 (IP2),
Role of activation of ectosolic 5'-nucleotidase in the cardioprotection mediated by opening of K+c channels.
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We tested the hypothesis that the opening of ATP-sensitive K+ channels contributes to activation of ectosolic 5'-nucleotidase and the infarct size-limiting effect of ischemic preconditioning. In open-chest dogs, the left anterior descending coronary artery was occluded four times for 5 min each,
Impact of cardiac-specific expression of CD39 on myocardial infarct size in mice.
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OBJECTIVE
Prior work suggests that ischemic preconditioning increases the level of CD39 in the heart and contributes to cardiac protection. Therefore, we examined if targeted cardiac expression of CD39 protects against myocardial injury.
METHODS
Mice with cardiac-specific expression of human CD39
A role of opening of mitochondrial ATP-sensitive potassium channels in the infarct size-limiting effect of ischemic preconditioning via activation of protein kinase C in the canine heart.
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The opening of mitochondrial ATP-sensitive K+ (mitoK(ATP)) channels triggers or mediates the infarct size (IS)-limiting effect of ischemic preconditioning (IP). Because ecto-5'-nucleotidase related to IP is activated by PKC, we tested whether the opening of mitoK(ATP) channels activates PKC and
Extracellular Adenosine Formation by Ecto-5'-Nucleotidase (CD73) Is No Essential Trigger for Early Phase Ischemic Preconditioning.
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BACKGROUND
Adenosine is a powerful trigger for ischemic preconditioning (IPC). Myocardial ischemia induces intracellular and extracellular ATP degradation to adenosine, which then activates adenosine receptors and elicits cardioprotection. Conventionally extracellular adenosine formation by
[The involvement of adenosine and adenosine deaminase in experimental myocardial infarct].
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By the ligature of the left coronary artery in the rat anesthetized with nembutal (10 mg/100 i.p.) a significant increase of the 5'-nucleotidase activity (Wooton method) was noticed 10 minutes after the left ventricle infarction (from an average value of 1038.5 +/- 187 mU/g tissue to 1537 +/- 225
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