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Am J Physiol Regul Integr Comp Physiol 270: R228-R237, 1996;
0363-6119/96 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 270, Issue 1 228-R237, Copyright © 1996 by American Physiological Society

ARTICLES

20-HETE is an endogenous inhibitor of the large-conductance Ca(2+)-activated K+ channel in renal arterioles

A. P. Zou, J. T. Fleming, J. R. Falck, E. R. Jacobs, D. Gebremedhin, D. R. Harder and R. J. Roman
Department of Physiology, Medical College of Wisconsin, Milwaukee 53226, USA.

The present study examined the effects of 20-hydroxyeicosatetraenoic acid (20-HETE) and 17-octadecynoic acid (17-ODYA), an inhibitor of the metabolism of arachidonic acid by P-450, on K(+)-channel activity in vascular smooth muscle cells (VSM) isolated from renal arterioles of the rat. Two types of K+ channels were characterized using inside-out excised membrane patches. One channel exhibited a large conductance (250.3 +/- 5 pS), was activated by membrane depolarization and elevations in cytoplasmic Ca2+ concentration, and was blocked by low concentrations (< 1 mM) of tetraethylammonium (TEA). The other K+ channel exhibited an intermediate conductance (46.3 +/- pS), was activated by membrane depolarization but not by changes in intracellular Ca2+ concentration, and was blocked by 4-aminopyridine (5 mM). Addition of 20-HETE to the bath (1-100 nM), reduced the frequency of opening of the large-conductance Ca(2+)-activated K+ channel recorded using cell-attached patches on VSM. It had no effect on the intermediate-conductance K+ channel: 17-ODYA (1 microM) increased the activity of the large-conductance Ca(2+)-activated K+ channel, and this effect was reversed by 20-HETE (10 nM). 20-HETE (1-1000 nM) reduced the diameter of isolated perfused small renal arteries of the rat by approximately 15% TEA (1 mM) blocked the vasoconstrictor response to 20-HETE (100 nM). These studies suggest that 20-HETE is an endogenously formed vasoconstrictor that acts in part by inhibiting the opening of the large-conductance Ca(2+)-activated K+ channel in renal arteriolar VSM.


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