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Am J Physiol Renal Physiol 277: F790-F796, 1999;
0363-6127/99 $5.00
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Vol. 277, Issue 5, F790-F796, November 1999

20-HETE agonists and antagonists in the renal circulation

Magdalena Alonso-Galicia1, John R. Falck2, Komandla Malla Reddy2, and Richard J. Roman1

1 Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin, 53226; and 2 Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, Texas 75235

The present study examined the effects of a series of 20-hydroxyeicosatetraenoic acid (20-HETE) derivatives on the diameter of renal arterioles to determine the structural requirements of the vasoconstrictor response to 20-HETE. The vascular responses to 5-, 8-, 12-, 15-, 19-, 20-, 21-HETEs, arachidonic acid (AA), and saturated, partially saturated, dimethyl, carboxyl, and 19-carbon derivatives of 20-HETE (10-8 to 10-6 M) were assessed in rat renal interlobular arteries (65-125 µm). 20-HETE, 21-HETE, dimethyl-20-HETE, and a partially saturated derivative of 20-HETE, 20-hydroxyeicosa-5(Z),14(Z)-dienoic acid, reduced vessel diameter by 19 ± 3, 17 ± 3, 16 ± 2, and 28 ± 2%, respectively. In contrast, 5-, 8-, 12-, 15-, and 19-HETE, AA, saturated, partially saturated, carboxyl, and the 19-carbon derivatives of 20-HETE had no effect on vessel diameter. Pretreatment with 5-, 15-, and 19-HETE, the 19-carbon derivative or 20-hydroxyeicosa-6(Z),15(Z)-dienoic acid (1 µM) completely blocked the vasoconstrictor response to 20-HETE in renal arterioles. Pretreatment with AA, carboxyl, saturated 19-carbon, and saturated 20-HETE derivatives (1 µM) partially blocked the response, whereas 8- and 12-HETE (1 µM) had no effect on the vasoconstrictor response to 20-HETE. These findings suggest that 20-HETE agonists and antagonists require a carboxyl or an ionizable group on carbon 1 and a double bond near the 14 or 15 carbon. 20-HETE agonists also require a functional group capable of hydrogen bonding on carbon 20 or 21, whereas antagonists lack this reactive group.

cytochrome P-450; renal arterioles; vasoconstriction; hydroxyeicosatetraenoic acids


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