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- W1501095220 abstract "Prostaglandins (PG) of the E series and catecholamines stimulate adenosine 3':5'-monophosphate (cAMP) formation in human astrocytoma cells (1321N1). These two classes of effectors activated adenylate cyclase upon interaction with different receptor systems. No evidence for a mediatory role for PG in the action of catecholamines was found. PG interacted with 1321N1 cells with an order of potency of PGE1 = PGE2 greater than PGA1 greater than PGF2 alpha. The effect of combinations of the various PG indicated that all efficacious PG interacted with a common receptor. 7-Oxa-13-prostynoic acid and indomethacin were shown to be competitive inhibitors of the effect of PGE1 with Ki values of 4 and 150 micron, respectively. These two compounds did not inhibit the effect of isoproterenol. Polyphloretin phosphate caused a complex pattern of inhibition of the effects of PGE1 and at higher concentrations also inhibited the effects of isoproterenol. The mefenamate class of nonsteroidal anti-inflammatory agents was found to inhibit the effects of PGE1 with a potency order of meclofenamic acid greater than flufenamic acid = mefenamic acid. The inhibitory action of meclofenamic acid was complex involving specific, but partial, insurmountable antagonism of PGE1 as well as competitive inhibition of PGE1 effects. At higher concentrations of meclofenamic acid a nonspecific inhibition of the effects of both PGE1 and isoproterenol was observed. These studies suggest that the inhibition by nonsteroidal anti-inflammatory agents of the physiological effects of PGE1 in animals may occur, at least in part, at the level of adenylate cyclase. The possibility that multiple classes of adenylate cyclase-linked PGE receptors might exist in nature is discussed." @default.
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- W1501095220 date "1977-09-01" @default.
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- W1501095220 title "Stimulation of adenosine 3':5'-monophosphate formation by prostaglandins in human astrocytoma cells. Inhibition by nonsteroidal anti-inflammatory agents." @default.
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- W1501095220 doi "https://doi.org/10.1016/s0021-9258(17)40022-6" @default.
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