Renal actions of endothelin-1 and endothelin-3: interactions with the prostaglandin system and nitric oxide

American Journal of Kidney Diseases : the Official Journal of the National Kidney Foundation
S Y Chou, J G Porush

Abstract

Endothelins (ET) possess both vasodilatory and vasoconstrictive properties. The renal actions of ET-1 and ET-3, as well as in vivo interactions of these two isopeptides with the prostaglandin and endothelium-derived relaxation factor/nitric oxide systems were studied in anesthetized dogs. The ETs were infused intrarenally at doses not affecting systemic hemodynamics. Both ET-1 and ET-3 induced an early transient renal vasodilation, followed by a prolonged vasoconstriction. Inhibition of nitric oxide synthase with NG-monomethyl-L-arginine completely abolished the renal vasodilation induced by either ET-1 or ET-3 and enhanced the vasoconstriction. Endothelin-1 was associated with an increase in the renal release of prostacyclin, while urinary thromboxane A2 was increased after ET-3 administration. Inhibition of cyclooxygenase (with indomethacin) augmented the renal vasoconstriction induced by ET-1, but inhibition of cyclooxygenase (with meclofenamate) abolished the ET-3-evoked vasoconstriction. Endothelin-1 showed little effects on urinary water and sodium excretion; however, ET-3 displayed significant diuretic and natriuretic effects, which were inhibited by nitric oxide synthase inhibition. These findings suggest that these two...Continue Reading

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Citations

Mar 20, 2010·Canadian Journal of Physiology and Pharmacology·Kumar Kesavarao EbenezarFrancine Gabriel Smith
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