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Am J Physiol Cell Physiol 268: C978-C984, 1995;
0363-6143/95 $5.00
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AJP - Cell Physiology, Vol 268, Issue 4 C978-C984, Copyright © 1995 by American Physiological Society

ARTICLES

C-type natriuretic peptide neuromodulates via "clearance" receptors

G. J. Trachte, S. Kanwal, B. J. Elmquist and R. J. Ziegler
Department of Pharmacology, University of Minnesota-Duluth, School of Medicine 55812, USA.

A recently discovered endogenous autacoid, C-type natriuretic peptide, was tested in a pheochromocytoma (PC12) cell line for effects on 1) catecholamine release induced by a depolarizing stimulus, 2) guanylyl and adenylyl cyclase activities, and 3) specific 125I-labeled atrial natriuretic peptide (ANP) binding. C-type natriuretic peptide suppressed evoked neurotransmitter release in the absence of guanylyl cyclase activation or adenylyl cyclase inhibition; however, both a "clearance" (ANP-C) receptor binding agent, des-[Gln18Ser19Gly20Leu21Gly22]-ANF-(4-23)-NH2 (cANF), and pertussis toxin prevented this neuromodulatory effect. The C-type natriuretic peptide preferentially bound to receptors that also bound cANF. The results suggest that C-type natriuretic peptide suppressed evoked neurotransmitter efflux by binding to ANP-C receptors coupled to a pertussis toxin-sensitive process; furthermore, the neuromodulatory effect of C-type natriuretic peptide occurred independently of guanylyl cyclase activation or adenylyl cyclase inhibition. The novel aspects of these findings are 1) neuromodulatory effects of C-type natriuretic peptide, 2) guanylyl cyclase-independent actions of C-type natriuretic peptide, and 3) ANP-C receptors mediating C-type natriuretic peptide actions.


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