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Endothelin: a potent renal and systemic vasoconstrictor peptide.
A J King1, B M Brenner, S Anderson
1Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts 02115.
The American Journal of Physiology
|June 1, 1989
Summary
Endothelin, a peptide from endothelial cells, acts as a potent vasoconstrictor. This study shows endothelin significantly impacts blood pressure and kidney function in rats, potentially contributing to microvascular diseases.
Area of Science:
- Cardiovascular Physiology
- Renal Physiology
- Endocrinology
Background:
- Endothelin is a peptide produced by endothelial cells.
- Endothelin has demonstrated potent vasoconstrictor properties.
Purpose of the Study:
- To investigate the systemic and renal hemodynamic effects of endothelin in anesthetized rats.
- To determine the dose-dependent pressor effects and duration of action of endothelin.
- To examine the impact of endothelin on renal plasma flow, glomerular filtration rate, and intrarenal resistance patterns.
Main Methods:
- Intravenous bolus injections and continuous infusions of endothelin in Munich-Wistar rats.
- Measurement of systemic and renal hemodynamic parameters.
- Micropuncture studies to assess arteriolar resistance and glomerular capillary pressure.
Main Results:
- Endothelin induced dose-dependent pressor effects, with maximal systemic and renal responses lasting over 90 minutes at higher doses.
- Renal plasma flow decreased more than glomerular filtration rate, increasing filtration fraction.
- Continuous infusion elevated efferent arteriolar resistance more than afferent, increasing glomerular capillary hydraulic pressure and reducing the ultrafiltration coefficient.
Conclusions:
- Endothelin is a potent systemic and renal vasoconstrictor.
- Its effects on renal hemodynamics suggest a role in glomerular injury.
- Endothelin may be implicated in the pathophysiology of clinical microvasculopathies.