Shear stress protects against endothelial regulation of vascular smooth muscle cell migration in a coculture system.
Vascular endothelial cells (ECs) are constantly exposed to blood flow-induced shear stress; these forces strongly influence the behaviors of neighboring vascular smooth muscle cells (VSMCs). VSMC migration is a key event in vascular wall remodeling. In this study, the authors assessed the difference between VSMC migration in VSMC/EC coculture under static and shear stress conditions. Utilizing a parallel-plate coculture flow chamber system and Transwell migration assays, they demonstrated that human ECs cocultured with VSMCs under static conditions induced VSMC migration, whereas laminar shear stress (1.5 Pa, 15 dynes/cm2) applied to the EC side for 12 h significantly inhibited this process. The changes in VSMC migration is mainly dependent on the close interactions between ECs and VSMCs. Western blotting showed that there was a consistent correlation between the level of Akt phosphorylation and the efficacy of shear stress-mediated EC regulation of VSMC migration. Wortmannin and Akti significantly inhibited the EC-induced effect on VSMC Akt phosphorylation and migration. These results indicate that shear stress protects against endothelial regulation of VSMC migration, which may be an atheroprotective function on the vessel wall.
Wang
Han Qin
HQ
School of Life Sciences and Biotechnology, Institute of Mechanobiology and Medical Engineering, Shanghai Jiao Tong University, Shanghai, China.
Huang
Lang Xian
LX
Qu
Ming Juan
MJ
Yan
Zhi Qiang
ZQ
Liu
Bo
B
Shen
Bao Rong
BR
Jiang
Zong Lai
ZL
D002450:Cell Communication; D002465:Cell Movement; D018920:Coculture Techniques / Q000379:methods; D042783:Endothelial Cells / Q000166:cytology*; D006801:Humans; D009131:Muscle, Smooth, Vascular / Q000166:cytology*; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D015398:Signal Transduction; D013314:Stress, Mechanical; D014471:Umbilical Veins / Q000166:cytology*
D019869:Phosphatidylinositol 3-Kinases; D051057:Proto-Oncogene Proteins c-akt