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AJP - Renal Physiology, Vol 266, Issue 6 934-F941, Copyright © 1994 by American Physiological Society
ARTICLES |
A. P. Zou, J. D. Imig, P. R. Ortiz de Montellano, Z. Sui, J. R. Falck and R. J. Roman
Department of Physiology, Medical College of Wisconsin, Milwaukee 53226.
The role of endogenous P-450 metabolites of arachidonic acid (AA) on the tubuloglomerular feedback (TGF) response was examined. Under control conditions stop-flow pressure (SFP) fell by 17.0 +/- 2.1 mmHg when the perfusion rate of the loop of Henle was increased from 0 to 50 nl/min. Addition of AA (50 microM) to the perfusate lowered basal SFP by 11.4 +/- 1.1 mmHg and potentiated the TGF response. This effect was blocked by addition of a P-450 inhibitor, 17-octadecynoic acid (17-ODYA) (10 microM), to the perfusate. Perfusion of the loop of Henle with 17-ODYA elevated basal SFP by 3.7 +/- 0.3 mmHg and reduced the TGF response by 80%. After blockade of endogenous P-450 activity with 17-ODYA, addition of 20-hydroxyeicosatetraenoic acid (20-HETE, 10 microM) to the perfusate produced a flow rate-dependent fall in SFP. The effect of 20-HETE was not altered by pretreating the animal with meclofenamate (2 mg/kg iv) or by perfusing the nephron segment with furosemide (50 microM). These results indicate that endogenous P-450 metabolites of AA, particularly 20-HETE, may play a role in TGF and the regulation of renal vascular tone.
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