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Wang L, Zheng J, Du Y, Huang Y, Li J, Liu B, Liu CJ, Zhu Y, Gao Y, Xu Q, Kong W, Wang X. Cartilage Oligomeric Matrix Protein Maintains the Contractile Phenotype of Vascular Smooth Muscle Cells by Interacting With α
7
β
1
Integrin. Circ Res 2010; 106:514-25. [DOI: 10.1161/circresaha.109.202762] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Rational
:
Vascular smooth muscle cells (VSMCs) switching from a contractile/differentiated to a synthetic/dedifferentiated phenotype has an essential role in atherosclerosis, postangioplastic restenosis and hypertension. However, how normal VSMCs maintain the differentiated state is less understood.
Objective
:
We aimed to indentify the effect of cartilage oligomeric matrix protein (COMP), a normal vascular extracellular matrix, on modulation of VSMCs phenotype.
Methods and Results
:
We demonstrated that COMP was associated positively with the expression of VSMC differentiation marker genes during phenotype transition. Knockdown of COMP by small interfering (si)RNA favored dedifferentiation. Conversely, adenoviral overexpression of COMP markedly suppressed platelet-derived growth factor-BB-elicited VSMC dedifferentiation, characterized by altered VSMC morphology, actin fiber organization, focal adhesion assembly, and the expression of phenotype-dependent markers. Whereas α
7
integrin coimmunoprecipitated with COMP in normal rat VSMCs and vessels, neutralizing antibody or siRNA against α
7
integrin inhibited VSMC adhesion to COMP, which indicated that α
7
β
1
integrin is a potential receptor for COMP. As well, blocking or interference by siRNA of α
7
integrin completely abolished the effect of COMP on conserving the contractile phenotype. In accordance, ectopic adenoviral overexpression of COMP greatly retarded VSMC phenotype switching, rescued contractility of carotid artery ring, and inhibited neointima formation in balloon-injured rats.
Conclusions
:
Our data suggest that COMP is essential for maintaining a VSMC contractile phenotype and the protective effects of COMP are mainly mediated through interaction with α
7
β
1
integrin. Investigations to identify the factors affecting the expression and integrity of COMP may provide a novel therapeutic target for vascular disorders.
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Affiliation(s)
- Li Wang
- From the Department of Physiology and Pathophysiology (L.W., Y.D., Y.H., J.L., B.L., Y.Z., Y.G., W.K., X.W.), School of Basic Medical Sciences, Peking University; and Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, People’s Republic of China; Department of Cardiology (J.Z.), China-Japan Friendship Hospital, Beijing, People’s Republic of China; Departments of Orthopaedic Surgery and Cell Biology (C.-j.L.), New York University School of Medicine; and Cardiovascular
| | - Jingang Zheng
- From the Department of Physiology and Pathophysiology (L.W., Y.D., Y.H., J.L., B.L., Y.Z., Y.G., W.K., X.W.), School of Basic Medical Sciences, Peking University; and Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, People’s Republic of China; Department of Cardiology (J.Z.), China-Japan Friendship Hospital, Beijing, People’s Republic of China; Departments of Orthopaedic Surgery and Cell Biology (C.-j.L.), New York University School of Medicine; and Cardiovascular
| | - Yaoyao Du
- From the Department of Physiology and Pathophysiology (L.W., Y.D., Y.H., J.L., B.L., Y.Z., Y.G., W.K., X.W.), School of Basic Medical Sciences, Peking University; and Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, People’s Republic of China; Department of Cardiology (J.Z.), China-Japan Friendship Hospital, Beijing, People’s Republic of China; Departments of Orthopaedic Surgery and Cell Biology (C.-j.L.), New York University School of Medicine; and Cardiovascular
| | - Yaqian Huang
- From the Department of Physiology and Pathophysiology (L.W., Y.D., Y.H., J.L., B.L., Y.Z., Y.G., W.K., X.W.), School of Basic Medical Sciences, Peking University; and Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, People’s Republic of China; Department of Cardiology (J.Z.), China-Japan Friendship Hospital, Beijing, People’s Republic of China; Departments of Orthopaedic Surgery and Cell Biology (C.-j.L.), New York University School of Medicine; and Cardiovascular
| | - Jing Li
- From the Department of Physiology and Pathophysiology (L.W., Y.D., Y.H., J.L., B.L., Y.Z., Y.G., W.K., X.W.), School of Basic Medical Sciences, Peking University; and Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, People’s Republic of China; Department of Cardiology (J.Z.), China-Japan Friendship Hospital, Beijing, People’s Republic of China; Departments of Orthopaedic Surgery and Cell Biology (C.-j.L.), New York University School of Medicine; and Cardiovascular
| | - Bo Liu
- From the Department of Physiology and Pathophysiology (L.W., Y.D., Y.H., J.L., B.L., Y.Z., Y.G., W.K., X.W.), School of Basic Medical Sciences, Peking University; and Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, People’s Republic of China; Department of Cardiology (J.Z.), China-Japan Friendship Hospital, Beijing, People’s Republic of China; Departments of Orthopaedic Surgery and Cell Biology (C.-j.L.), New York University School of Medicine; and Cardiovascular
| | - Chuan-ju Liu
- From the Department of Physiology and Pathophysiology (L.W., Y.D., Y.H., J.L., B.L., Y.Z., Y.G., W.K., X.W.), School of Basic Medical Sciences, Peking University; and Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, People’s Republic of China; Department of Cardiology (J.Z.), China-Japan Friendship Hospital, Beijing, People’s Republic of China; Departments of Orthopaedic Surgery and Cell Biology (C.-j.L.), New York University School of Medicine; and Cardiovascular
| | - Yi Zhu
- From the Department of Physiology and Pathophysiology (L.W., Y.D., Y.H., J.L., B.L., Y.Z., Y.G., W.K., X.W.), School of Basic Medical Sciences, Peking University; and Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, People’s Republic of China; Department of Cardiology (J.Z.), China-Japan Friendship Hospital, Beijing, People’s Republic of China; Departments of Orthopaedic Surgery and Cell Biology (C.-j.L.), New York University School of Medicine; and Cardiovascular
| | - Yuansheng Gao
- From the Department of Physiology and Pathophysiology (L.W., Y.D., Y.H., J.L., B.L., Y.Z., Y.G., W.K., X.W.), School of Basic Medical Sciences, Peking University; and Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, People’s Republic of China; Department of Cardiology (J.Z.), China-Japan Friendship Hospital, Beijing, People’s Republic of China; Departments of Orthopaedic Surgery and Cell Biology (C.-j.L.), New York University School of Medicine; and Cardiovascular
| | - Qingbo Xu
- From the Department of Physiology and Pathophysiology (L.W., Y.D., Y.H., J.L., B.L., Y.Z., Y.G., W.K., X.W.), School of Basic Medical Sciences, Peking University; and Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, People’s Republic of China; Department of Cardiology (J.Z.), China-Japan Friendship Hospital, Beijing, People’s Republic of China; Departments of Orthopaedic Surgery and Cell Biology (C.-j.L.), New York University School of Medicine; and Cardiovascular
| | - Wei Kong
- From the Department of Physiology and Pathophysiology (L.W., Y.D., Y.H., J.L., B.L., Y.Z., Y.G., W.K., X.W.), School of Basic Medical Sciences, Peking University; and Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, People’s Republic of China; Department of Cardiology (J.Z.), China-Japan Friendship Hospital, Beijing, People’s Republic of China; Departments of Orthopaedic Surgery and Cell Biology (C.-j.L.), New York University School of Medicine; and Cardiovascular
| | - Xian Wang
- From the Department of Physiology and Pathophysiology (L.W., Y.D., Y.H., J.L., B.L., Y.Z., Y.G., W.K., X.W.), School of Basic Medical Sciences, Peking University; and Key Laboratory of Molecular Cardiovascular Science, Ministry of Education, Beijing, People’s Republic of China; Department of Cardiology (J.Z.), China-Japan Friendship Hospital, Beijing, People’s Republic of China; Departments of Orthopaedic Surgery and Cell Biology (C.-j.L.), New York University School of Medicine; and Cardiovascular
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