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AJP - Renal Physiology, Vol 265, Issue 2 180-F186, Copyright © 1993 by American Physiological Society
ARTICLES |
K. Schricker and A. Kurtz
Institut fur Physiologie I, University of Regensburg, Germany.
This study aimed to examine the role of nitric oxide (NO) in the regulation of renin secretion from renal juxtaglomerular (JG) cells. Using primary cultures of mouse renal JG cells, we found that sodium nitroprusside (SNP) and 3-morpholino-sydnonimin-hydrochloride (SIN-1), two structurally different liberators of NO, led to a transient inhibition during the first hour followed by a marked dose-dependent stimulation of renin secretion lasting for an additional 20 h. This stimulatory effect was blunted by methylene blue (50 microM) and was reversible within minutes after removal of the NO liberators. SNP and SIN-1 also stimulated guanylate cyclase activity in the cultures with a maximum within the first hour of incubation. Increasing intracellular guanosine 3',5'-cyclic monophosphate levels by 8-(4-chlorophenylthio)guanosine 3',5'-cyclic monophosphate (100 microM) or by atrial natriuretic peptide (10 nM) decreased basal renin secretion but did not inhibit the effect of SNP. The stimulatory effect of SNP was not related to adenosine 3',5'-cyclic monophosphate levels in the JG cells and was blunted after chelation of extracellular calcium by 2 mM ethylene glycol-bis(beta-amino-ethyl ether)-N,N,N'N'-tetraacetic acid. Taken together, our findings suggest that liberators of NO have two effects on renin secretion from isolated JG cells: an inhibitory effect mediated by stimulation of soluble guanylate cyclase activity and a stimulatory effect mediated by an as yet unknown pathway that requires extracellular calcium.
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