Effect of prostanoids on renin release from rabbit afferent arterioles with and without macula densa

Kidney International
S ItoK Yoshinaga

Abstract

There is evidence that cyclooxygenase products of arachidonic acid participate in the control of renin release. In this study we tested the hypothesis that prostaglandin (PG) I2 and/or its metabolite(s), which are synthesized in the afferent arteriole (AF), stimulate renin release by acting directly on the AF while PGE2 stimulates renin release indirectly via the macula densa. AF alone and AF with macula densa attached (AF-MD) were microdissected from rabbit kidneys and incubated in vitro. The renin release rate from a single AF (or an AF-MD) was calculated and expressed as ng AI.hr-1. AF-1/hr (where AI is angiotensin I). When arachidonic acid (0.12 mM) or PGI2 (10 microM) was added to AF, renin release increased significantly (P less than 0.0001) from 1.04 +/- 0.21 to 3.12 +/- 0.86 (x +/- SEM, N = 7), and from 0.45 +/- 0.14 to 1.48 +/- 0.53 (N = 9), respectively. During the recovery period, renin release increased even further, reaching 9.53 +/- 1.76 and 4.50 +/- 1.24, respectively. A PGI2 synthetase inhibitor, 9, 11-azoprosta-5,13-dienoic acid blocked the effect of arachidonic acid. To examine whether the increases in renin release during the recovery period were due to metabolite(s) of PGI2, we tested the effect of both 6-ke...Continue Reading

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Citations

Jul 2, 1999·The American Journal of Medicine·P E Lipsky
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