槲皮素抑制血小板-内皮细胞粘附及粘附分子表达槲皮素抑制血小板-内皮细胞粘附及粘附分子表达

目的研究槲皮素(Que)对人脐静脉内皮细胞(HUVEC)和人血小板的粘附作用,及其粘附分子表达。方法用流式细胞仪测定肿瘤坏死因子(TNF-α)诱导HUVEC表达细胞间粘附分子(ICAM-1)及凝血酶诱导的人血小板P-选择素的表达，用［³H］-Adenine标记人血小板,检测其与HUVEC的粘附反应。结果Que与人血小板作用后，可抑制凝血酶诱导的人血小板表达P-选择素。HUVEC经TNF-α处理后，明显增加细胞表面ICAM-1的表达,加强其与血小板的粘附反应，Que在一定剂量范围内可抑制HUVEC表达ICAM-1,并可抑制其与血小板的粘附作用。结论Que可抑制内皮细胞和血小板粘附及粘附分子表达。

Effects of quercetin on platelet-endothelial cell adhesion and their expression of adhesion molecules

AIM: To observe the effect of quercetin (Que) on the adhesion of platelets to cultured endothelial cells and adhesion molecule expression by human umbilical vein endothelial cells (HUVEC) and platelets. METHODS: 3H]-Adenine labeled platelets were incubated with HUVEC to investigate the effect of Que on adhesion of platelets to HUVEC. The number of platelets adhering to the HUVEC monolayer was determined by liquid scintillation spectroscopy. TNF-alpha induced HUVEC expression ICAM-1 and thrombin induced platelets expression of P-selectin were measured by flow cytometry. RESULTS: Que (0.3-2.4 mumol.L-1) was shown to inhibit the increase of P-selectin expression of thrombin activated platelets. Pretreatment of HUVEC with tumor necrosis factor (TNF-alpha) significantly increased platelets adhesion to HUVEC and the expression ICAM-1. Que (0.6-2.4 mumol.L-1) inhibited this effect of TNF-alpha in a concentration-dependent manner. CONCLUSION: Que can inhibit the adhesion of platelets to HUVEC and the expression of adhesion molecules (P-selectin and ICAM-1).