NDT Advance Access originally published online on August 24, 2004
Nephrology Dialysis Transplantation 2004 19(11):2742-2746; doi:10.1093/ndt/gfh471
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Nephrol Dial Transplant Vol. 19 No. 11 © ERA-EDTA 2004; all rights reserved
Original Article
Effects of endothelin-1 and endothelin-1-receptor blockade on renal function in humans
Department of Nephrology and Hypertension, University Medical Center Utrecht, the Netherlands
Correspondence and offprint requests to: Dr Peter Boer, PhD, Department of Nephrology and Hypertension, University Medical Center Utrecht, Room F03.226, PO Box 85500, 3805 GA Utrecht, the Netherlands. Email: p.boer{at}azu.nl
Background. In patients with renal or cardiac failure, renal function may be endangered by elevated plasma concentrations of the vasoconstrictor endothelin-1 (ET-1). To mimic effects of pathologically increased plasma ET-1, we gave intravenous ET-1 in healthy subjects and examined whether simultaneous infusion of the ETA-receptor antagonist VML 588 would prevent the effects of ET-1 on the kidney.
Methods. Nine healthy men received on four separate days intravenous infusion of ET-1 (2.5 ng/kg/min) superimposed on vehicle (saline) or on VML 588 infusion (0.05, 0.20 and 0.40 mg/kg/h) in randomized order to assess the effects on renal function and renal haemodynamics.
Results. At resting plasma ET-1, infusion of VML 588 alone had no significant effects on renal function. Infusion of ET-1 alone decreased glomerular filtration rate by 11% and this reduction was not reversed by co-infusion of VML 588. ET-1 reduced renal blood flow by 35% and VML 588 reduced this decrease by one-third, in a dose-independent fashion. ET-1 increased the filtration fraction by 34% and VML 588 reduced this increase dose-independently by one-half. ET-1 increased renal vascular resistance by 59% and VML 588 reduced this increase dose-independently by one-half. Finally, ET-1 decreased sodium excretion by 58% and VML 588 reduced this decrease dose-independently by two-thirds.
Conclusions. ET-1-induced reductions in renal function were partially but not completely prevented in a dose-independent manner by the ETA-receptor antagonist VML 588.
Keywords: endothelin-1; endothelin-1-receptor antagonist; filtration fraction; glomerular filtration rate; renal blood flow; renal vascular resistance
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