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- W2048321632 abstract "An adenosine-sensitive adenylate cyclase has been characterized in cultured mesenteric artery smooth muscle cells. N-Ethylcarboxamide-adenosine (NECA), N-Methylcarboxamide-adenosine (MECA), L-N6-phenylisopropyladenosine (PIA) and 2-chloroadenosine (2-cl-Ado) all stimulated adenylate cyclase in a concentration dependent manner. NECA was the most potent analog (EC50, 1 μM), whereas PIA (EC50, 15 μM), 2-Cl-Ado (EC50, 15 μM) and MECA (EC50, 24 μM), were less potent and had efficacies relative to NECA of 0.61, 0.61 and 0.65, respectively. Adenosine showed a biphasic effect: stimulation at lower concentrations and inhibition at higher concentrations, whereas 2′ deoxyadenosine only inhibited adenylate cyclase activity. The stimultory effect of NECA on adenylate cyclase was dependent on metal ion concentration and was blocked by 3-isobutyl-l-methylxanthine (IBMX) and 8-phenyltheophylline (8-PT). Adenylate cyclase from these cultured cells was also stimulated by other agonists such as epinephrine, norepinephrine, prostaglandins, dopamine, NaF and forskolin. The stimulation of adenylate cyclase by isoproterenol, epinephrine and norepinephrine was blocked by propranalol but not by phentolamine. On the other hand, phentolamine, propranalol and flupentixol all inhibited dopamine-stimulated adenylate cyclase activity. In addition, the stimulation by an optimal concentration of PIA was additive or almost additive with maximal stimulation caused by catacholamines and prostaglandins. These data indicate the presence of adenosine (Stimulatory “Ra”), catecholamine and prostaglandin receptors in mesenteric artery smooth muscle cells and suggest that these agents may exert their physiological actions through their interaction with their respective receptors coupled to adenylate cyclase." @default.
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- W2048321632 date "1985-09-01" @default.
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- W2048321632 title "Stimulation of adenylate cyclase by adenosine and other agonists in mesenteric artery smooth muscle cells in culture" @default.
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- W2048321632 doi "https://doi.org/10.1016/0024-3205(85)90521-1" @default.
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