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Am J Physiol Endocrinol Metab 268: E428-E432, 1995;
0193-1849/95 $5.00
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AJP - Endocrinology and Metabolism, Vol 268, Issue 3 E428-E432, Copyright © 1995 by American Physiological Society

ARTICLES

Effects of ANP receptor antagonists on ANP secretion from adult rat cultured atrial myocytes

S. Nachshon, O. Zamir, Y. Matsuda and N. Zamir
Tokyo Research Laboratories, Kyowa Hakko Kogyo Co. Ltd., Japan.

Atrial natriuretic peptide (ANP) is a hormone-secreted predominantly by atrial myocytes. ANP exerts many of its actions via activation of the particulate guanylyl cyclase receptor ANPR-A and the formation of guanosine 3',5'-cyclic monophosphate (cGMP), which serves as a second messenger in the target cells. Using membrane-permeable cGMP analogues (8-bromo-cGMP and dibutyryl- cGMP), we first tested the hypothesis that ANP secretion by adult rat cultured atrial myocytes can be modulated through the second messenger cGMP. Second, we examined the effects of two competitive ANPR-A receptor antagonists, namely HS-142-1 and anantin, on cGMP formation and ANP secretion from cultured atrial myocytes. Cultured atrial myocytes secreted large quantities of immunoreactive (ir) ANP under basal conditions. We found that cGMP analogues inhibited basal irANP secretion from cultured atrial myocytes, whereas HS-142-1 and anantin had stimulating effects. HS-142-1 and anantin reduced cGMP formation in cultured atrial myocytes at basal conditions. These results suggest an autoregulatory mechanism of ANP secretion by atrial myocytes in an autocrine/paracrine fashion.


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