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• W1858043133 abstract "The role of endogenous prostaglandin production in phorbol diester-induced myocardial atrial natriuretic peptide (ANP) secretion was investigated in cultured spontaneously beating ventricular rat cardiomyocytes. Incubation of cells with 4 beta-phorbol 12-myristate 13-acetate (PMA; 0.1 microM) led to a rapid response in ANP release, a response accompanied by increases in cellular prostacyclin (PGI2) production, cyclic AMP (cAMP) formation and spontaneous contraction frequency. Although PMA-induced ANP secretion exhibited the pharmacological profile of a protein kinase C (PKC)-mediated event, the response was abolished in the presence of the cyclo-oxygenase inhibitors indomethacin (10 microM) and diclofenac (1 microM), indicating that endogenous prostaglandin production is responsible for PMA-induced ANP secretion in this system. Confirming this, PMA-induced ANP secretion was strongly correlated with endogenous formation of 6-oxo-prostaglandin F1 alpha (r = 0.93, P < 0.0005, n = 11), and exogenously applied PGI2, prostaglandin E2 (PGE2) or prostaglandin F2 alpha (PGF2 alpha) elicited simultaneous increases in cAMP formation, contraction frequency and ANP secretion in these cells. Furthermore, PMA-induced cAMP formation was abolished in the presence of either diclofenac or indomethacin, whereas the cAMP-elevating agent forskolin (0.1 microM) mimicked the secretory and chronotropic effect of PMA in these cells. A role for cAMP in PMA-induced ANP secretion was also apparent insofar as PMA-induced ANP release was substantially decreased in the presence of the Rp-diastereomer of 3',5'-cyclic adenosine monophosphorothioate (Rp-cAMPS; 10 microM), whereas the cAMP-mimetic agent dibutyryl cAMP (10 microM) provoked a rapid increase in ANP secretion in this system. Finally, the Ca(2+)-channel antagonist nifedipine (0.1 microM) severely decreased PGI2-, PGE2- and PMA-induced ANP secretion without affecting PGF2 alpha-induced peptide release, suggesting that PGI2 and/or PGE2, but not PGF2 alpha, are the prostanoids involved in PMA-induced ANP release. Taken together, these results suggest that PKC activation induces ANP secretion in spontaneously beating rat ventricular cardiomyocytes via an autocrine pathway involving increased PGI2 and/or PGE2 formation, a response leading to the activation of a myocardial adenylate cyclase and, subsequently, to that of a nifedipine-sensitive Ca2+ channel." @default.
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• W1858043133 date "1994-10-01" @default.
• W1858043133 modified "2023-09-27" @default.
• W1858043133 title "Role of prostaglandin-mediated cyclic AMP formation in protein kinase C-dependent secretion of atrial natriuretic peptide in rat cardiomyocytes" @default.
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• W1858043133 doi "https://doi.org/10.1042/bj3030217" @default.
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