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AJP - Renal Physiology, Vol 268, Issue 5 948-F952, Copyright © 1995 by American Physiological Society
ARTICLES |
S. G. Greenberg, X. R. He, J. B. Schnermann and J. P. Briggs
Department of Physiology, University of Michigan, Ann Arbor 48109, USA.
Experiments were performed on juxtaglomerular granular cells (JGC) in short-term primary culture to determine the direct immediate effect of NO on renin secretion and to test whether JGC are able to generate NO. Renin secretion was measured repeatedly over short time intervals in a cell superfusion system. Renin release did not significantly decrease over a 40-min observation period in untreated JGC. Addition of sodium nitroprusside (SNP) caused a reduction in renin release (measured in nano-Goldblatt hog units vs. time, i.e., nGU/min) from 479 +/- 25, 423 +/- 70, and 388 +/- 54 nGU/min to 295 +/- 19 (n = 5), 102 +/- 21 (n = 7), and 71 +/- 9 nGU/min (n = 6) with 10(-5), 10(-4), and 10(-3) M SNP, respectively. In the presence of the guanylate cyclase inhibitor methylene blue at 10(-4) M, SNP at 10(-4) M had no significant effect on renin secretion. 8-Bromoguanosine 3',5'-cyclic monophosphate at 10(-4) M in the presence of the phosphodiesterase inhibitor 3-isobutyl-1-methylxanthine (10(-3) M) caused a reduction of renin secretion to 50.1 +/- 3.6% of control. To examine the possibility that renin secretion is affected by NO release from JGC, we assessed the effect of the NO synthase (NOS) substrate L-arginine (10(-3) M) and the NOS blocker N omega-nitro-L-arginine (10(-4) M) on renin secretion. Renin release was not significantly altered by either stimulation or inhibition of NOS activity.(ABSTRACT TRUNCATED AT 250 WORDS)
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