Send to:

Choose Destination
See comment in PubMed Commons below
Clin Exp Hypertens. 2010 Jan;32(1):61-9. doi: 10.3109/10641960902993095.

Increased ET-1 and reduced ET(B) receptor expression in uremic hypertensive rats.

Author information

  • 1CHUQ Research Center and Division of Nephrology & Hypertension, L'Hôtel-Dieu de Québec Hospital and Department of Medicine, Laval University, Quebec, Canada.


The endothelin-1 (ET-1) system has been implicated in cardiovascular disease associated with chronic renal failure. We investigated the expression and localization of ET-1 and the ET(B) and ET(A) receptors in vascular and renal tissues of uremic hypertensive rats. Uremia was induced by renal artery branches ligation. At week 6, blood and renal parameters, and plasma and urine ET-1 levels were evaluated. The ET-1, and the ET(B) and ET(A) receptors expression and localization were determined by Northern and Western blotting, and by immunofluorescence, respectively. Blood pressure, serum creatinine, proteinuria, and urinary ET-1 were increased in uremic rats. The ET-1 expression was increased in the aorta, mesenteric arteries, and the renal cortex of uremic rats, whereas the ET(B) receptor expression was reduced. Immunofluorescence analysis using the thoracic aorta revealed that the endothelial ET-1 levels were increased 4-fold in uremic rats. In contrast, the ET(B) receptor expression, which was localized exclusively in the endothelium, was markedly reduced. The ET(A) receptor expression, however, was increased 1.6-fold and was detected in the media only. Similar changes in ET-1 and ET(B) receptor expression were observed in renal cortex vessels and glomeruli of uremic rats. This study reveals that ET-1 levels are augmented in the vascular endothelium of uremic rats, whereas the ET(B) receptor expression is reduced which may play a major role in hypertension and renal failure progression.

[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Taylor & Francis
    Loading ...
    Write to the Help Desk