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Evidence for endothelin involvement in the response to high salt
1Vascular Biology Center, Department of Surgery, Medical College of Georgia, Augusta, Georgia 30912-2500, USA. dpollock@mail.mcg.edu
American Journal of Physiology. Renal Physiology
|June 16, 2001
Summary
Endothelin-1 (ET-1) influences blood pressure by regulating sodium excretion, primarily via the ET(B) receptor. Blocking this receptor significantly elevates mean arterial pressure (MAP), especially in rats on a high-salt diet.
Area of Science:
- Cardiovascular Physiology
- Renal Physiology
- Endocrinology
Background:
- Endothelin-1 (ET-1) is implicated in blood pressure regulation.
- Evidence suggests ET-1 may control sodium excretion, potentially via the ET(B) receptor.
Purpose of the Study:
- To investigate the role of endothelin-1 (ET-1) and its receptors in blood pressure regulation.
- To determine the specific involvement of the ET(B) receptor in salt-induced hypertension.
Main Methods:
- Mean arterial pressure (MAP) was monitored in Sprague-Dawley rats on high-salt or low-salt diets.
- Rats were treated with ET(B) receptor antagonist A-192621 and subsequently with ET(A) antagonist ABT-627.
Main Results:
- High-salt diet significantly increased MAP compared to low-salt diet.
- ET(B) receptor blockade with A-192621 markedly elevated MAP, particularly in high-salt conditions.
- Subsequent ET(A) receptor blockade with ABT-627 reduced MAP in both diet groups.
Conclusions:
- Endothelin, acting through the ET(B) receptor, plays a crucial role in blood pressure control during salt loading.
- ET(B) receptor antagonism exacerbates salt-induced increases in blood pressure.
- ET(A) receptor activity contributes to maintaining blood pressure under these conditions.