Downregulation of miR-223 and miR-153 mediates mechanical stretch-stimulated proliferation of venous smooth muscle cells via activation of the insulin-like growth factor-1 receptor

被引:63
作者
Song, Lei [1 ]
Duan, Ping [1 ]
Guo, Ping [1 ]
Li, Dianwei [1 ]
Li, Songtao [1 ]
Xu, Yuan [1 ]
Zhou, Qiang [1 ]
机构
[1] Third Mil Med Univ, Affiliated Hosp 1, Dept Orthopaed, Chongqing, Peoples R China
基金
中国国家自然科学基金;
关键词
Vascular smooth muscle cells; VSMCs; Insulin-like growth factor-1 receptor; IGF-1R; MiR-223; MiR-153; PI3K-AKT pathway; NEOINTIMAL HYPERPLASIA; CARDIOVASCULAR-DISEASE; GENE-EXPRESSION; SHEAR-STRESS; MICRORNAS; BIOLOGY; GRAFTS; ALPHA;
D O I
10.1016/j.abb.2012.08.015
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Autologous venous grafts, used to circumvent occluded coronary arteries during coronary artery bypass, often develop thrombosis and neointimal hyperplasia. During neointimal hyperplasia, vascular smooth muscle cells (VSMCs), exposed to substantially higher pressure and hemodynamic forces, proliferate and extracellular matrix accumulate causing narrowing of the vessel lumen. Activation of insulin-like growth factor-1 receptor (IGF-1R) has been confirmed to be critically involved in mechanical stretch-stimulated VSMC proliferation. However, the comprehensive mechanisms responsible for activation of IGF-1R in VSMCs by mechanical stretch remain unclear. This study found that miR-223 and miR-153, targeted to IGF-1R, were down-regulated in VSMCs under stretch stress by miRNA microarray analysis in conjunction with Target Scan analysis. Overexpression of miR-223 or miR-153 down-regulated IGF-1R expression and activity in VSMCs under stretch stress. Specifically, overexpression of miR-223 and miR-153 inhibited stretch stress-enhanced VSMC proliferation and the activity of PI3K-AKT signaling. In conclusion, our study indicates that miR-153 and miR-223 are reduced in VSMCs by stretch stress, contributing to IGF-1R activation and resultant VSMC proliferation. Thus, miR-153 and miR-223 may be viable therapeutic targets for mechanical stretch-induced neointimal hyperplasia in vein grafts. (C) 2012 Published by Elsevier Inc.
引用
收藏
页码:204 / 211
页数:8
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