title: Negative regulation of atrial natriuretic factor receptor coupled membrane guanylate cyclase by phorbol ester. Potential protein kinase C regulation of cyclic GMP signal in isolated adrenocortical carcinoma cells of rat.
abstract: Rat adrenocortical carcinoma cells possess a high density of atrial natriuretic factor (ANF) receptors which are coupled with membrane guanylate cyclase and corticosterone production. Herein we show that pretreatment of these cells with phorbol 12-myristate 13-acetate (PMA), a known activator of protein kinase C, attenuates the ANF-stimulated cyclic GMP accumulation in a dose-dependent manner. The half maximum inhibitory concentration of PMA was 10(-10) M. When these cells were incubated with PMA in the presence of 1-(5-isoquinolinyl-sulfonyl)-2-methyl piperazine, a protein kinase C inhibitor, the PMA-mediated attenuation of ANF-stimulated cyclic GMP formation is blocked. These results suggest that protein kinase C negatively regulates the ANF-receptor coupled membrane guanylate cyclase system in these cells.
mesh_terms: D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D000306:Adrenal Cortex Neoplasms / Q000378:metabolism*; D000818:Animals; D009320:Atrial Natriuretic Factor / Q000494:pharmacology; D006152:Cyclic GMP / Q000096:biosynthesis*; D004789:Enzyme Activation / Q000187:drug effects; D006162:Guanylate Cyclase / Q000378:metabolism*; D007546:Isoquinolines / Q000494:pharmacology; D010766:Phosphorylation; D010879:Piperazines / Q000494:pharmacology; D011493:Protein Kinase C / Q000037:antagonists & inhibitors / Q000378:metabolism*; D051381:Rats; D017461:Receptors, Atrial Natriuretic Factor; D011956:Receptors, Cell Surface / Q000502:physiology*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*
chemical_list: D007546:Isoquinolines; D010879:Piperazines; D011956:Receptors, Cell Surface; C472610:atrial natriuretic peptide, rat; D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D009320:Atrial Natriuretic Factor; D011493:Protein Kinase C; D006162:Guanylate Cyclase; D017461:Receptors, Atrial Natriuretic Factor; D006152:Cyclic GMP; D013755:Tetradecanoylphorbol Acetate