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Endothelin-3 effects on renal function and prostanoid release in the rat isolated kidney
C T Stier1, C P Quilley, J C McGiff
1Department of Pharmacology, New York Medical College, Valhalla.
Summary
Rat endothelin (ET-3) directly impacts kidney function, increasing blood flow and prostanoid release. However, prostaglandins do not significantly alter ET-3
Area of Science:
- Nephrology
- Endocrinology
- Pharmacology
Background:
- Endothelin (ET-3) is a peptide with known vasoactive properties.
- Its direct effects on renal hemodynamics and prostanoid production require further elucidation.
Purpose of the Study:
- To investigate the direct impact of endothelin (ET-3) on isolated rat kidney function.
- To examine the influence of ET-3 on renal prostanoid levels and excretion.
Main Methods:
- Utilized an isolated, oncotically perfused rat kidney model.
- Administered ET-3 at varying concentrations (0.75 and 2.0 ng/ml).
- Measured perfusion pressure, glomerular filtration rate, water and electrolyte excretion, and various prostanoid levels (6-keto-PGF1α, PGE2, PGF2α, thromboxane B2).
- Investigated the role of prostaglandins using indomethacin.
Main Results:
- ET-3 significantly increased renal perfusion pressure and glomerular filtration rate.
- ET-3 enhanced the excretion of water and electrolytes.
- ET-3 stimulated the release of 6-keto-prostaglandin F1α, PGE2, and PGF2α, but not thromboxane B2.
- ET-3 suppressed time-dependent renin release.
- Indomethacin blocked ET-3-induced prostanoid increases but did not alter renal hemodynamic or excretory responses.
Conclusions:
- ET-3 directly stimulates prostanoid release from the rat kidney's vascular and urinary compartments.
- Prostaglandins do not appear to modulate the acute renal hemodynamic and excretory effects of ET-3 under these experimental conditions.