title: The phorbol ester induced atrial natriuretic peptide secretion is stimulated by forskolin and Bay K8644 and inhibited by 8-bromo-cyclic GMP.
abstract: The role of intracellular signals in the regulation of atrial natriuretic peptide (ANP) release was studied using the isolated perfused rat heart. The phorbol ester, 12-O-tetradecanoyl-phorbol-13-acetate (TPA), known to activate the protein kinase C pathway, produced a dose-dependent increase in perfusate ANP immunoreactivity. Bay k8644, a putative calcium channel activator, and forskolin, which stimulates adenylate cyclase, induced a sustained increase in ANP secretory rate. TPA in combination with either Bay k8644 or forskolin induced higher ANP secretion than the calculated additive value for each agent. 8-bromo-cyclic GMP and sodium nitroprusside, when given alone, had no effect on ANP secretion, but delayed the TPA-stimulated increase in perfusate ANP. ANP secretion appears therefore to be mediated both by the phosphoinositide and the cAMP system, whereas the cGMP pathway may be inhibitory.
mesh_terms: D001498:3-Pyridinecarboxylic acid, 1,4-dihydro-2,6-dimethyl-5-nitro-4-(2-(trifluoromethyl)phenyl)-, Methyl ester / Q000494:pharmacology*; D000818:Animals; D009320:Atrial Natriuretic Factor / Q000378:metabolism*; D002118:Calcium / Q000494:pharmacology; D005576:Colforsin / Q000494:pharmacology*; D000242:Cyclic AMP / Q000502:physiology; D006152:Cyclic GMP / Q000031:analogs & derivatives* / Q000494:pharmacology; D003864:Depression, Chemical; D010477:Perfusion; D051381:Rats; D013268:Stimulation, Chemical; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*
chemical_list: D005576:Colforsin; C016276:8-bromocyclic GMP; D001498:3-Pyridinecarboxylic acid, 1,4-dihydro-2,6-dimethyl-5-nitro-4-(2-(trifluoromethyl)phenyl)-, Methyl ester; D009320:Atrial Natriuretic Factor; D000242:Cyclic AMP; D006152:Cyclic GMP; D013755:Tetradecanoylphorbol Acetate; D002118:Calcium