PPARgamma activation abolishes LDL-induced proliferation of human aortic smooth muscle cells via SOD-mediated down-regulation of superoxide.

Abstract:

:Native LDL would be a mitogenic and chemotactic stimulus of VSMC proliferation and differentiation in the atherosclerotic lesion where endothelial disruption occurred. In previous studies, our group investigated the molecular mechanisms by which LDL induces IL-8 production and by which PPARalpha activation abolishes LDL effects in human aortic SMCs (hAoSMCs). Herein is the first report of PPARgamma activation by troglitazone (TG) exerting its inhibitory effects on LDL-induced cell proliferation via generation not of H(2)O(2), but of O2(.-), and the subsequent activation of Erk1/2 in hAoSMCs. Moreover, in this study TG abolished the LDL-accelerated G(1)-S progression to control levels via down-regulation of active cyclinD1/CDK4 and cyclinE/CDK2 complexes and up-regulation of p21(Cip1) expression. TG exerted its anti-proliferative effects through the up-regulation of basal superoxide dismutase (SOD) expression. This data suggests that the regulation of O2(.-) is located at the crossroads between LDL signaling and cell proliferation.

authors

Heo KS,Kim DU,Ryoo S,Nam M,Baek ST,Kim L,Park SK,Myung CS,Hoe KL

doi

10.1016/j.bbrc.2007.06.006

subject

Has Abstract

pub_date

2007-08-10 00:00:00

pages

1017-23

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(07)01231-4

journal_volume

359

pub_type

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