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- W2264366818 abstract "The possible cardioprotective roles of adenosine A1 and A3 receptors were investigated in a cardiac myocyte model of injury. The adenosine A3 receptor is a novel cardiac receptor capable of mediating potentially important cardioprotective functions. Prolonged hypoxia with glucose deprivation was used to simulate ischemia and to induce injury in cardiac ventricular myocytes cultured from chick embryos 14 days in ovo. When present during the prolonged hypoxia, the adenosine A3 agonists N6-(3-iodobenzyl)adenosine-5'-N-methyluronamide (IB-MECA) and 2-chloro-N6-(3-iodobenzyl)adenosine-5'-N-methyluronamide (CI-IB-MECA) caused a dose-dependent reduction in the extent of hypoxia-induced injury as manifested by a decrease in the amount of creatine kinase released and the percentage of myocytes killed. The adenosine A1 agonists 2-chloro-N6-cyclopentyladenosine (CCPA), N6-cyclohexyladenosine, and adenosine amine congener were also able to cause a decrease in the extent of myocyte injury. The A1 receptor-selective antagonist 8-cyclopentyl-1,3-dipropylxanthine blocked the cardioprotective effect of the A1 but not of the A3 agonists. Conversely, the selective A3 antagonists MRS-1191 and MRS-1097 blocked the protection induced by CI-IB-MECA but had minimal effect on that caused by CCPA. Thus the cardioprotective effects of A1 and A3 agonists were mediated by their respective receptors. This study defines a novel cardioprotective function of the cardiac A3 receptor and provides conclusive evidence that activation of both A1 and A3 receptors during hypoxia can attenuate myocyte injury." @default.
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- W2264366818 date "1997-07-01" @default.
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- W2264366818 title "A novel cardioprotective function of adenosine A1 and A3 receptors during prolonged simulated ischemia" @default.
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- W2264366818 doi "https://doi.org/10.1152/ajpheart.1997.273.1.h501" @default.
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