The angiotensin receptor blocker, azilsartan medoxomil (TAK-491), suppresses vascular wall expression of plasminogen activator inhibitor type-I protein potentially facilitating the stabilization of atherosclerotic plaques.

Abstract:

:Increased expression of plasminogen activator inhibitor type-I (PAI-1) in vessel walls seems to accelerate atherosclerosis. Angiotensin II can increase the synthesis of PAI-1. Inhibition of this process may facilitate migration of vascular smooth muscle cells (VSMCs) stabilizing atherosclerotic plaques. To determine whether the inhibition of the angiotensin II type 1 receptor can blunt the expression of PAI-1 protein in the aortic wall, we administered azilsartan medoxomil (AZL-M), a prodrug of an angiotensin II type 1 receptor blocker developed by the Takeda Pharmaceutical Company Limited, for 16 weeks to ApoE knockout mice on a high fat diet rendered overexpressors of PAI-1 in VSMCs. Homogenates of the pooled aortas from each group were assayed for PAI-1 by enzyme-linked immunosorbent assay. Cellularity of atherosclerotic lesions was assessed by 4',6-diamidino-2-phenylindole staining in sections of aortic lesions, and collagen content in the lesions was quantified by immunohistochemistry. Aortic wall PAI-1 was decreased by each of the 3 dosage regimens of AZL-M (0.1-10 mg/kg). Cellularity and collagen were increased in lesions from mice given AZL-M, consistent with the development of more stable plaques. Accordingly, the suppression of PAI-1 expression by AZL-M may attenuate the evolution of atherosclerotic plaques vulnerable to rupture.

journal_name

J Cardiovasc Pharmacol

authors

French CJ,Zaman AK,Sobel BE

doi

10.1097/FJC.0b013e31821dcbea

subject

Has Abstract

pub_date

2011-08-01 00:00:00

pages

143-8

issue

2

eissn

0160-2446

issn

1533-4023

journal_volume

58

pub_type

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