Objective:To investigate the effects of Propyl Gallate(PrG) on cellular adhesion between human umbilical vein endothelial cells(HUVEC) and polymorphonuclear leukocytes(PMN) as well as the expression of intercellular adhesion molecule-1(ICAM-1,CD54) and E-selectin(CD62E) on the VEC surface.Methods: A human VEC inflammation model was induced by tumor necrosis factor alpha(TNF-α).VECs were preincubated with varying concentrations of PrG(0.001-5 mmol/L) or 1‰DMSO(v:v) or 10 mmol/L acetylsalicylic acid(ASA) for 1 h,and then were stimulated with 10 ng/mL TNF-αfor 6 h.Rose bengal vital staining method was used to measure the adherence rate of PMN to VEC,while flow cytometry was used to determine the expression of CD54 and CD62E on the VEC surface.Results:After 6 h of incubation with TNF-α,the adherence of PMN to HUVECs as well as the percentage of fluorescence-positive cells and mean fluorescence intensity (MFI) of surface CD54 and CD62E in HUVECs increased significantly(P<0.01).Pre-treatment of HUVECs with PrG(0.1-5 mmol/L) significantly suppressed the adherence of PMN to VECs induced by TNF-α(P<0.05).PrG (1-5 mmol/L) inhibited the VEC surface expression of CD62E and CD54 in a dose-dependent way(P<0.05).PrG at lower concentrations(0.001-0.1 mmol/L) showed no effect on CD54 expression,while it showed a slightly increasing trend in CD62E expression(P>0.05).ASA at 10 mmol/L had no obvious effect on the positive rate of CD62E and CD54.Conclusions:High concentrations of PrG(0.1-5 mmol/L) exert its inhibitory effect on cellular adherence of PMN to HUVECs,and its mechanism may be related to inhibiting surface expression of CD54 and CD62E in HUVECs.Its action concentration was lower than that of ASA. Objective: To investigate the effects of Propyl Gallate (PrG) on cellular adhesion between human umbilical mediolateral endothelial cells (HUVEC) and polymorphonuclear leukocytes (PMN) as well as the expression of intercellular adhesion molecule-1 (ICAM-1, CD54) and E -selectin(CD62E) on the VEC surface.Methods: A human VEC inflammation model was induced by tumor necrosis factor alpha(TNF-α).VECs were preincubated with varying concentrations of PrG(0.001-5 mmol/L) or 1 ‰DMSO (v:v) or 10 mmol/L acetylsalicylic acid(ASA) for 1 h,and then were stimulated with 10 ng/mL TNF-αfor 6 h.Rose bengal vital staining method was used to measure the adherence rate of PMN to VEC ,while flow cytometry was used to determine the expression of CD54 and CD62E on the VEC surface.Results:After 6 h of incubation with TNF-α,the adherence of PMN to HUVECs as well as the percentage of fluorescence-positive cells and fluorescencemean fluorescence Intensity (MFI) of surface CD54 and CD62E in HUVECs increased significantly (P<0.01). Pre-trea Tment of HUVECs with PrG (0.1-5 mmol/L) significantly suppressed the adherence of PMN to VECs induced by TNF-α (P<0.05). PrG (1-5 mmol/L) inhibited the VEC surface expression of CD62E and CD54 In a dose-dependent way (P<0.05). PrG at lower concentrations (0.001-0.1 mmol/L) showed no effect on CD54 expression, while it showed a slightly increasing trend in CD62E expression (P>0.05).ASA at 10 Mmol/L had no obvious effect on the positive rate of CD62E and CD54.Conclusions:High concentrations of PrG(0.1-5 mmol/L) exert its inhibitory effect on cellular adherence of PMN to HUVECs, and its mechanism may be related to inhibiting Surface expression of CD54 and CD62E in HUVECs.Its action concentration was lower than that of ASA.