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- W1976208021 abstract "The PC12 cell line, a clone isolated from a pheochromocytoma tumor of rat adrenal medulla, was shown to exclusively contain stimulatory adenosine (A2) receptors linked to adenylate cyclase (AC). AC was stimulated 6-7 fold by several agonists with a rank order of potency of 5'-N-Ethyl carboxamidoadenosine (NECA) greater than 2-Chloroadenosine (2-CADO) greater than (R)-N-Phenylisopropyladenosine (R-(-)-PIA) greater than N6-Cyclopentyladenosine (CPA) greater than N6-Cyclohexyladenosine (CHA) greater than S-(+)-PIA. AC activity was antagonized by a variety of adenosine receptor antagonists with a potency order of 1,3,-Dipropyl-8-(2-amino-4-chlorophenyl)xanthine (PACPX) greater than 1,3,-Diethyl-8-phenylxanthine (DPX) greater than 8-Phenyltheophylline greater than 3-Isobutyl-1-methylxanthine (IBMX) greater than 8-(p-sulfophenyl)theophylline (PST) greater than 7-(beta-chloroethyl)theophylline greater than theophylline = enprofylline = caffeine. Under conditions known to favour receptor-mediated Ni-coupled inhibition of AC, R-(-)-PIA failed to inhibit both basal and forskolin stimulated AC activity in PC12 cells, confirming the absence of an A1 mediated response. On the other hand, adenosine agonists inhibited AC activity in rat cortical membranes with a rank order of potency of CPA greater than R-(-)-PIA greater than CHA greater than NECA greater than S-(+)-PIA greater than 2-CADO. These findings suggest that PC12 cells are functionally deficient in an A1 receptor linked AC response but are efficiently coupled to A2 stimulatory receptors. The cells should prove useful for further study of A2 adenosine receptors and to establish selectivity profiles of compounds acting at both A1 and A2 receptors." @default.
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- W1976208021 date "1986-09-01" @default.
- W1976208021 modified "2023-09-23" @default.
- W1976208021 title "Pharmacological profile of adenosine A2 receptor in PC12 cells" @default.
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- W1976208021 doi "https://doi.org/10.1016/0024-3205(86)90197-9" @default.
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