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Role of angiotensin II AT1 receptor activation in cardiovascular diseases
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Journal Article
Role of angiotensin II AT1 receptor activation in cardiovascular diseases
2008
Overview
Numerous clinical studies and experimental investigations using cell culture and animal models suggest that angiotensin II (AngII) via AT1 receptor activation might induce cardiovascular hypertrophy, fibrosis and atherosclerosis resulting in vascular events such as myocardial infarction, heart failure or stroke and in end-organ damages. However, a question still remains: which part of these damages is due to a direct effect of AngII on its target tissues and which is due to AngII-induced hypertension? In an attempt to answer this question, a new model of transgenic mice, expressing a constitutively activated AT1A receptor instead of the wild type receptor has been obtained by homologous recombination. These mice present with a moderate increase of blood pressure (20mm Hg), hypertrophy of the small kidney arteries but not cardiac hypertrophy. The major phenotypic trait of these mice is the early and progressive development of a cardiovascular fibrosis. In light of these results and those from the literature, there is more and more evidence that in human hypertension, activation of the renin angiotensin system plays a minor role in the development of cardiovascular hypertrophy, but clearly participates to the development of cardiovascular fibrosis.
Publisher
Elsevier Inc,Nature Publishing Group,Elsevier Limited
Subject
