Document Detail


ARB and Cardioprotection.
MedLine Citation:
PMID:  22538956     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
A growing body of evidence has suggested that the use of angiotensin II (Ang II) type 1 (AT(1)) receptor blockers (ARBs) leads to a significant decrease in mortality and morbidity in patients with congestive heart failure. The AT(1) receptor is a seven-transmembrane G protein-coupled receptor, and is involved in regulating the physiological and pathological process of the cardiovascular system. Systemically and locally generated Ang II has agonistic action on AT(1) receptor. However, recent in vitro studies have demonstrated that AT(1) receptor is structurally flexible and instable, and has significant and varying levels of spontaneous activity in an Ang II-independent manner. Furthermore, mechanical stress activates AT(1) receptor by inducing conformational switch without the involvement of Ang II. Experimental studies have demonstrated that Ang II-independent activation of AT(1) receptor is profoundly relevant to the pathogenesis of cardiac remodeling in vivo, and that these agonist-independent activities of AT(1) receptor can be inhibited by inverse agonists, but not by neutral antagonists. Therefore, inverse agonist activity emerges as an important pharmacological parameter that contributes to cardioprotective effects of ARBs through inhibiting both Ang II-dependent and -independent activation of AT(1) receptor.
Authors:
Hiroshi Akazawa; Chizuru Yabumoto; Masamichi Yano; Yoko Kudo-Sakamoto; Issei Komuro
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-4-27
Journal Detail:
Title:  Cardiovascular drugs and therapy / sponsored by the International Society of Cardiovascular Pharmacotherapy     Volume:  -     ISSN:  1573-7241     ISO Abbreviation:  -     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-4-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8712220     Medline TA:  Cardiovasc Drugs Ther     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Cardiovascular Medicine, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.
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