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Losartan inhibits the angiotensin II-induced stimulation of the phosphoinositide signalling system in vascular smooth muscle cells.

Abstract：

:2-n-Butyl-4-chloro-5-hydroxymethyl-1-[(2'-(1H-tetrazol-5-yl)bip hen yl-4-yl)methyl]imidazole, potassium salt (Losartan) (previous name, DuP 753 or MK 954) is a nonpeptide angiotensin II receptor antagonist. This study was performed to investigate the ability of Losartan to inhibit the angiotensin II-induced stimulation of the phospoinositide signalling system and the angiotensin II-induced hypertrophy in aortic vascular smooth muscle cells of normotensive Wistar-Kyoto rats. 10(-7) M Losartan abolished the angiotensin II-induced formation of inositol 1,4,5-trisphosphate in vascular smooth muscle cells. 10(-6) M Losartan completely abolished the angiotensin II-induced elevation of the intracellular free Ca2+ concentration ([Ca2+]i). 10(-6) M Losartan lacked effects on the [Arg8]vasopressin-induced elevation of [Ca2+]i. In addition, 10(-6) M completely inhibited the angiotensin II-induced stimulation of Na+/H+ exchange in the vascular smooth muscle cells. 10(-10) to 10(-6) M Losartan inhibited the angiotensin II-induced cell protein synthesis in a concentration-dependent manner, yielding to an effective concentration (ED50) of 6.2 +/- 1.8 x 10(-8) M (n = 4). Losartan did not affect the platelet-derived growth factor-BB-induced increase in cell protein. These results show that Losartan is a highly specific angiotensin II receptor antagonist which inhibits angiotensin II-induced cell growth and thus may have beneficial effects on the development and regression of vascular hypertrophy.

journal_name

Eur J Pharmacol

journal_title

European journal of pharmacology

authors

Ko Y,Görg A,Appenheimer M,Wieczorek AJ,Düsing R,Vetter H,Sachinidis A

doi

10.1016/0922-4106(92)90130-n

keywords:

subject

Has Abstract

pub_date

1992-10-01 00:00:00

pages

215-9

issue

2

eissn

0014-2999

issn

1879-0712

journal_volume

227

pub_type

杂志文章

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