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The effect of synthetic alpha-human atrial natriuretic peptide (alpha hANP), a potent natriuretic and vasorelaxant polypeptide recently isolated from human atria, on aldosterone secretion was studied in vitro in collagenase-dispersed adrenal adenoma cells from a patient with primary aldosteronism. alpha hANP (3.2 X 10(-7) M) significantly inhibited both basal and potassium (16 mM)-stimulated aldosterone secretion, whereas it had little or no effect on aldosterone secretion submaximally or maximally stimulated by ACTH (3.4 X 10(-10)-3.4 X 10(-9) M) or angiotensin II (10(-8)-10(-9) M). The less potent effect of alpha hANP on aldosterone secretion by dispersed human adrenal tumor cells compared to that in in vitro animal studies may reflect decreased affinity and/or number of specific receptors for ANP on the tumor cells. Whether ANP plays a physiological role in regulation of aldosterone secretion in humans in vivo remains to be determined.
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