[Effect of flow shear stress on the expression of adhesion molecules of endothelial cells].
Adherence of various leukocytes, including monocyte, to vascular endothelial cells may play an important role in the development of atherosclerosis. In vivo, the hemodynamic shear forces have a critical effect on the surface expression of adhesion proteins. In order to elucidate the effect of flow shear stress on the expression of adhesion molecules of endothelial cells, we investigated the effect of flow shear stress (2.23-6.08 dyne/cm2) on the expression of adhesive molecules, intercellular adhesion molecule(ICAM-1), vascular cell adhesion molecule (VCAM-1), and E-selectin on cultured human umbilical vein endothelial cells(HUVECs). The expression of adhesion molecules on the surface of HUVECs induced by shear stress was analyzed using flow cytometry. The results showed that compared with stationary control, the surface expression of ICAM-1 was significantly increased (P < 0.05) on HUVECs after exposure to different shear stress (2.23, 4.20, 6.08 dyne/cm2), and it was found to be in close relationship with the shearing time (r = 0.992, 0.997, 0.997; P < 0.05). After exposure to shear(2.23 dyne/cm2), VCAM-1 expression was significant increased(P < 0.05), and it was positively correlated with the shearing time(r = 0.930; P < 0.05), while VCAM-1 expression dropped down to basal level(P < 0.05) after it was sheared at 4.20 or 6.08 dyne/cm2, and the magnitude of the reduction of VCAM-1 expression was negatively correlated with the shearing time (r = -0.975, -0.989; P < 0.05). E-selectin expression was less sensitive to shear stress, especially at the lower magnitudes of shear. These results indicate that the increase of ICAM-1 and VCAM-1 expression in endothelial cells induced by low shear stress may play a prominent role in the development of both inflammation and atherosclerosis.
Chen
Y
Y
Institue of Biomedical Engineering, West China University of Medical Sciences, Chengdu 610041.
Chen
H
H
Liu
X
X
Lei
S
S
Mao
Y
Y
Zhang
W
W
D002478:Cells, Cultured; D019040:E-Selectin / Q000096:biosynthesis*; D004730:Endothelium, Vascular / Q000166:cytology* / Q000378:metabolism; D006801:Humans; D018799:Intercellular Adhesion Molecule-1 / Q000096:biosynthesis*; D013314:Stress, Mechanical; D014471:Umbilical Veins / Q000166:cytology; D019010:Vascular Cell Adhesion Molecule-1 / Q000096:biosynthesis*
D019040:E-Selectin; D019010:Vascular Cell Adhesion Molecule-1; D018799:Intercellular Adhesion Molecule-1