Distinctions between non-peptide angiotensin II AT1-receptor antagonists

Journal of the Renin-angiotensin-aldosterone System : JRAAS
Georges VauquelinPatrick Ml Vanderheyden

Abstract

A far-reaching understanding of the molecular action mechanism of AT1-receptor antagonists (AIIAs) was obtained by using CHO cells expressing transfected human AT 1-receptors. In this model, direct [3H]-antagonist binding and inhibition of agonist-induced responses (inositol phosphate accumulation) can be measured under identical experimental conditions. Whereas preincubation with a surmountable AIIA (losartan) causes parallel shifts of the angiotensin II (Ang II) concentration-response curve, insurmountable antagonists also cause partial (i.e., 30% for irbesartan, 50% for valsartan, 70% for EXP3174,) to almost complete (95% for candesartan) reductions of the maximal response. The main conclusions are that all investigated antagonists are competitive with respect to Ang II. They bind to a common or overlapping site on the receptor in a mutually exclusive way. Insurmountable inhibition is related to the slow dissociation rate of the antagonist-receptor complex (t 1/2 of 7 minutes for irbesartan, 17 minutes for valsartan, 30 minutes for EXP3174 and 120 minutes for candesartan). Antagonist-bound AT1-receptors can adopt a fast and a slow reversible state. This is responsible for the partial nature of the insurmountable inhibition. ...Continue Reading

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Citations

Apr 8, 2006·Journal of Hypertension. Supplement : Official Journal of the International Society of Hypertension·Georges VauquelinIsabelle Van Liefde
Jan 22, 2005·Fundamental & Clinical Pharmacology·G Vauquelin, I Van Liefde
Feb 20, 2014·Medicinal Research Reviews·Dong GuoLaura H Heitman
Mar 26, 2004·Biochemical Pharmacology·Ilse VerheijenGeorges Vauquelin

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