title: [Effect of frequency of cyclic tensile strain on extracellular matrix of rat vascular smooth muscle cells in vitro].
abstract: To investigate the effect of different frequencies of cyclic tensile strain on extracellular matrix (ECM) of vascular smooth muscle cells (VSMCs) and to research the relationship between tensile strain and vascular remodeling, the aortic vascular smooth muscle cells of rats grown on dishes coated with collagen I were subjected to 10% elongation and various frequencies of mechanical strain using the Flexercell 4000 Strain Unit. The expression of extracellular matrix including fibronectin, collagen I and collagen III was detected by Real-time RT-PCR, and p38 activity by western blot. The result showed that the expression of extracellular matrix was induced by mechanical strain in a nonlinear frequency-dependent manner, which was mediated by p38 pathway. These results demonstrate that the variety of frequencies of cyclic tensile strain could modulate the expression of ECM. It may have important influence on vascular remodeling.
authors.affiliation: Institute of Mechanobiology and Medical Engineering, Shanghai Jiotong University, Shanghai 200240, China.
authors.forename: Mingjuan
authors.initials: M
authors.lastname: Qu
authors.forename: Bo
authors.initials: B
authors.lastname: Liu
authors.forename: Zonglai
authors.initials: Z
authors.lastname: Jiang
mesh_terms: D000818:Animals; D001011:Aorta / Q000166:cytology; D002478:Cells, Cultured; D024042:Collagen Type I / Q000096:biosynthesis; D024061:Collagen Type III / Q000096:biosynthesis; D005109:Extracellular Matrix / Q000378:metabolism*; D005353:Fibronectins / Q000096:biosynthesis; D008297:Male; D040542:Mechanotransduction, Cellular / Q000502:physiology*; D009131:Muscle, Smooth, Vascular / Q000166:cytology* / Q000502:physiology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D013314:Stress, Mechanical
chemical_list: D024042:Collagen Type I; D024061:Collagen Type III; D005353:Fibronectins