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Functional relevance of tetraspanin CD9 in vascular smooth muscle cell injury phenotypes: a novel target for the prevention of neointimal hyperplasia.

Abstract：

:Vascular smooth muscle cell (VSMC) migration and proliferation are critical events in the development of neointima following vascular injury. In this study, we found that CD9 is constitutively expressed in the VSMC of the neointima of injured carotid arteries. The in vitro migration and proliferation of human coronary artery smooth muscle (hCASM) cells were reduced by 40% and 63%, respectively, by treatment with a CD9 specific monoclonal antibody mAb7 when compared to control antibody treatment. In a mouse carotid ligation injury model, a single application of a neutralizing anti-mouse CD9 antibody resulted in a 31% (day 14, n=8, p<0.05), and 32% (day 28, n=5, p<0.01) reduction in neointima formation. In support of these findings, exogenous expression of human CD9 by CD9-adenoviral transduction led to 43% increases in neointima (p<0.05, n=6). Upon investigation of the mechanisms underlying CD9 mediated VSMC phenotypic events we found that integrin alpha5beta1 was a constitutive partner of CD9 and that CD9 significantly augmented PI-3 kinase dependent Akt phosphorylation. Furthermore, enhanced Akt phosphorylation was attenuated by mAb7 binding. Cumulatively, a functional link between CD9, alpha5beta1, PI3-K/Akt activity and enhanced VSMC migratory and proliferative phenotypes has been demonstrated. These studies suggest that agents that modulate CD9 mediated VSMC phenotypes may emerge as novel strategies for the treatment of abnormal vascular injury response.

journal_name

Atherosclerosis

journal_title

Atherosclerosis

authors

Kotha J,Zhang C,Longhurst CM,Lu Y,Jacobs J,Cheng Y,Jennings LK

doi

10.1016/j.atherosclerosis.2008.07.036

subject

Has Abstract

pub_date

2009-04-01 00:00:00

pages

377-86

issue

2

eissn

0021-9150

issn

1879-1484

pii

S0021-9150(08)00525-X

journal_volume

203

pub_type

杂志文章

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