KURTZ, A and DELLABRUNA, R and SCHOLZ, H and BAIER, W (1991) AMILORIDE ENHANCES THE SECRETION BUT NOT THE SYNTHESIS OF RENIN IN RENAL JUXTAGLOMERULAR CELLS. PFLUGERS ARCHIV-EUROPEAN JOURNAL OF PHYSIOLOGY, 419 (1). pp. 32-37. ISSN 0031-6768, 1432-2013
Full text not available from this repository.Abstract
In this study we have examined a potential role of the sodium/proton exchange system in the regulation of renin secretion. We found that the inhibitors of the Na+/H+ antiport, amiloride (1 mM) and ethylisopropylamiloride (EIPA, 50-mu-M), led to a 125% increase of renin secretion from cultured mouse juxtaglomerular cells. The stimulatory effect of EIPA on renin secretion was dependent on the extracellular concentrations of sodium and hydrogen ions. While lowering the extracellular pH from 7.3 to 7.0, and lowering [Na+]e from 130 mM to 5 mM had no effect on basal renin release, it markedly attenuated or even blunted the effect of EIPA on renin secretion. The stimulatory effect of forskolin on renin secretion, however, was not altered by decreases of extracellular pH and of sodium. Inhibition of basal renin release was achieved with angiotensin II (1-mu-M). In the presence of EIPA the inhibitory effect angiotensin II was markedly attenuated. Although effective on renin secretion, neither amiloride nor EIPA exerted a significant effect on the de novo synthesis of renin in cultured mouse JG cells. These findings are compatible with the idea that an amiloride-sensitive transport process, presumably the Na+/H+ exchanger, acts indirectly as an inhibitory signal transduction system for renin secretion from renal juxtaglomerular cells.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | VASCULAR SMOOTH-MUSCLE; GLOMERULAR MESANGIAL CELLS; PROTEIN KINASE-C; INTRACELLULAR PH; ANGIOTENSIN-II; NA+-H+; RELEASE; EXCHANGE; DIURETICS; JUXTAGLOMERULAR CELLS; RENIN SECRETION; RENIN SYNTHESIS; NA/H EXCHANGE; AMILORIDE |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:46 |
| URI: | https://pred.uni-regensburg.de/id/eprint/54935 |
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