Role of blood shear stress in the regulation of vascular smooth muscle cell migration

IEEE Transactions on Bio-medical Engineering
S Q Liu, J Goldman

Abstract

Smooth muscle cell (SMC) migration from the media to the intima of blood vessels contributes to neointimal formation and atherogenesis. Here, we demonstrate how blood shear stress regulates vascular SMC migration in the encapsulating tissue of a micro-cylinder implanted in the center of the rat vena cava with the micro-cylinder perpendicular to blood flow. In this model, the micro-cylinder was exposed to a laminar flow with a known shear stress field in the leading region and a vortex flow in the trailing region. After surgery, the micro-cylinder was encapsulated by a thrombus-like tissue within one day, followed by SMC migration from the vena cava to the encapsulating tissue from day 3 to 20. SMC migration was time-dependent with a peak migration speed at day 5. At each given time (excluding day 1), blood shear stress exerts an inhibitory effect on SMC migration with significantly suppressed SMC migration in the laminar flow region than in the stagnation, separation, and vortex flow regions. SMCs were relatively parallel to the shear stress direction in high shear stress regions, whereas perpendicular to the shear stress direction in low shear stress regions. These results suggest that blood shear stress plays a role in regula...Continue Reading

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