AJP - Renal Physiology, Vol 263, Issue 4 665-F670, Copyright © 1992 by American Physiological Society

ARTICLES

Inhibition of renin secretion from rat renal cortical slices by (R)-12-HETE

W. L. Henrich, J. R. Falck and W. B. Campbell
Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas.

The arachidonic acid metabolite 12-hydroxyeicosatetraenoic acid (12-HETE) inhibits renin secretion both in vivo and in vitro, but the enzymatic origin of the 12-HETE responsible for renin inhibition is unknown. These studies examined the effect of the 12-HETE stereoisomers (R)-12-HETE (a product of the cytochrome P-450 monooxygenase enzyme system) and (S)-12-HETE (a product of the lipoxygenase enzyme system) on basal and stimulated renin secretion from superficial cortical slices in the rat. First, rat cortex was shown to produce 12-HETE; chiral-phase high-performance liquid chromatography revealed that cortex produced 81% (S)-12-HETE and 19% (R)-12-HETE. (R)-12-HETE reduced basal renin release by 28 +/- 4% to 49 +/- 5% at concentrations of 10(-9) to 10(-7) M (P < 0.05 to 0.01). (S)-12-HETE did not significantly affect renin release. (R)-12-HETE also blunted isoproterenol-stimulated renin secretion (P < 0.05) at a concentration of 10(-6) M. 20-HETE, another cytochrome P-450 product, did not exert a significant effect on renin release. In summary, both (R)-12-HETE and (S)-12-HETE are synthesized by renal cortical tissue. Only (R)-12-HETE directly inhibits in vitro renin release. These findings suggest that the renal cytochrome P-450 enzyme system is capable of directly influencing local renin secretion.

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				J. H. Capdevila, J. R. Falck, and R. C. Harris Cytochrome P450 and arachidonic acid bioactivation: molecular and functional properties of the arachidonate monooxygenase J. Lipid Res., February 1, 2000; 41(2): 163 - 181. [Abstract] [Full Text]