This study sought to demonstrate that IL 8 expression in endothelial cells is regulated by not only chemical factors but also mechanical factors.After pretreating cultured human umbilical vein endothelial cells (HUVECs) with shear stress for different periods of time, we employed RT PCR to assay IL 8 mRNA expression and immunocytochemical staining to detect NF κB activation in HUVECs. The results showed:①IL 8 mRNA expressed little in HUVECs untreated or pretreated with low laiminar shear stress for 0.5...