Dermatopontin promotes adhesion, spreading and migration of cardiac fibroblasts in vitro

• Published in: Matrix biology Vol. 32; no. 1; pp. 23 - 31
• Main Authors: Liu, Xiaoyan, Meng, Liukun, Shi, Qiang, Liu, Shenghua, Cui, Chuanjue, Hu, Shengshou, Wei, Yingjie
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01-01-2013
• Subjects: Analysis of Variance; Animals; Antibodies, Blocking - metabolism; Blotting, Western; Cell Adhesion - physiology; Cell Hypoxia - physiology; Cell Movement - physiology; Cell Proliferation; Cells, Cultured; Chondroitin Sulfate Proteoglycans - metabolism; dermatopontin (DPT); DNA Primers - genetics; Enzyme-Linked Immunosorbent Assay; Extracellular Matrix Proteins - metabolism; Fibroblasts - metabolism; Fluorescent Antibody Technique; Gene Expression Regulation - physiology; In Vitro Techniques; Integrin alpha3beta1 - immunology; myocardial infarction; Myocardial Infarction - metabolism; Myocytes, Cardiac - metabolism; Rats; Rats, Sprague-Dawley; Real-Time Polymerase Chain Reaction; Reverse Transcriptase Polymerase Chain Reaction; ventricular remodeling; PBS; RT; HSPG; HRP; myocardial infarction; CMs; Fn; ventricular remodeling; DPT; DAPI; real time RT-PCR; dermatopontin (DPT); ECM; CFs; DMEM; TRITC-phalloidin; FBS; MI; GAPDH; HF; BrdU; hypoxia/SD
• ISSN: 0945-053X; 1569-1802
• DOI: 10.1016/j.matbio.2012.11.014

Dermatopontin (DPT), an extracellular matrix (ECM) protein, has been previously shown to be upregulated in the infarct zone of experimentally induced myocardial infarction (MI) rats. However, the accurate role that DPT exerts in the ventricular remodeling process after MI remains poorly understood. In this study, we evaluated the expression pattern of DPT mRNA and protein as well as its secretion in cultured neonatal rat cardiomyocytes (CMs) and cardiac fibroblasts (CFs) under conditions of hypoxia and serum deprivation (hypoxia/SD). Further, we tested the possible roles of DPT in CFs adhesion, spreading, migration and proliferation, which greatly promote the ventricular remodeling process after MI. Results showed that hypoxia/SD stimulated DPT expression and secretion in CMs and CFs and that DPT promoted adhesion, spreading and migration of CFs whereas had no effect on CFs proliferation. In addition, functional blocking antibodies specific for integrin α3 and β1 significantly reduced CFs adhesion and migration that DPT induced, suggesting that integrin α3β1 is at least one receptor for CFs adhesion and migration to DPT. These results implicated that DPT participates in the ventricular remodeling process after MI and may act as a potential therapeutic target for ventricular remodeling.
► Hypoxia and serum deprivation induced dermatopontin expression and secretion in cardiac cells. ► Dermatopontin promotes adhesion, spreading and migration of cardiac fibroblasts. ► Integrin α3β1 is at least one receptor for cardiac fibroblasts adhesion and migration to dermatopontin. ► Dermatopontin may be a therapeutic target for ventricular remodeling.