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- W1520717074 abstract "The effects of adenosine analogues on beta-adrenergic receptor and receptor-independent elicited increases in adenylate cyclase activity were investigated using membranes obtained from primary cultures of adult rat ventricular myocytes. Phenylisopropyladenosine, an A1-receptor agonist, at concentrations of 0.1, 1.0, and 10 microM, maximally inhibited isoproterenol-stimulated adenylate cyclase activity by 35, 55, and 41%, respectively. The inhibition by phenylisopropyladenosine was antagonized by 10 microM theophylline. One micromolar phenylisopropyladenosine was much less effective at attenuating forskolin-stimulated activity, such that the maximum inhibition was 26%. Phenylisopropyladenosine had no effect on adenylate cyclase stimulation by 5'-guanylylimidodiphosphate. Phenylaminoadenosine, an A2 agonist, at 10 microM or greater stimulated adenylate cyclase activity. This effect was not significantly inhibited by theophylline or 0.1 microM 1,3-dipropyl-8-cyclopentylxanthine (DPCPX), which antagonized phenylisopropyladenosine inhibition of isoproterenol-stimulated adenylate cyclase activity. Additionally, N-ethylcarboxamidoadenosine, a nonselective adenosine-receptor agonist, had no effect on adenylate cyclase activity in the absence of DPCPX but stimulated adenylate cyclase activity in the presence of DPCPX. These results indicate that both A1 and A2 receptors exist on the ventricular myocyte sarcolemma. More importantly, the findings suggest that adenosine inhibition of catecholamine-stimulated adenylate cyclase activity is primarily due to an alteration in beta-adrenergic receptor-mediated transduction and perhaps in part by a direct inhibition of the catalytic component." @default.
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- W1520717074 date "1989-10-01" @default.
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- W1520717074 title "Adenosine receptor coupling to adenylate cyclase of rat ventricular myocyte membranes" @default.
- W1520717074 doi "https://doi.org/10.1152/ajpheart.1989.257.4.h1088" @default.
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