不同类型维生素E对人脐静脉内皮细胞细胞间黏附分子-1表达的影响

目的:观察不同类型维生素E(α、γ、mixed-tocopherols)对氧化型低密度脂蛋白 (oxLDL)及重组人C反应蛋白 (rhCRP)诱导的人脐静脉内皮细胞 (HUVECs)细胞间黏附分子-1 (ICAM-1)表达的影响,以探讨不同类型维生素E的抗炎、抗动脉粥样硬化机制及不同效果. 方法: 体外培养HUVECs,分别加oxLDL、oxLDL α-tocopherol、oxLDL γ-tocopherol、oxLDL mixed-tocopherols、rhCRP、rhCRP α-tocopherol、rhCRP γ-tocopherol、rhCRP mixed-tocopherols孵育 24 h,采用细胞酶联免疫吸附(ELISA)、流式细胞、RT-PCR技术分别测定ICAM-1蛋白和mRNA表达水平. 结果: oxLDL和rhCRP均可诱导HUVECs的ICAM-1蛋白和mRNA表达增加,不同类型维生素E均可抑制oxLDL诱导的HUVECs的ICAM-1蛋白和mRNA表达,并呈浓度依赖性(50～200 μmol/L).与相同浓度的α、γ-tocopherol相比, mixed-tocopherols抑制作用最强.不同类型维生素E均不能抑制 rhCRP诱导的HUVECs的ICAM-1蛋白和mRNA表达.结论: 不同类型维生素E均可抑制oxLDL诱导的HUVECs的ICAM-1蛋白和mRNA表达,与α、γ-tocopherol相比,mixed-tocopherols对oxLDL诱导HUVECs表达ICAM-1的抑制作用最强.

Effect of different isoforms of tocopherols on expression of intercellular adhesion molecule-1 in human umbilical vein endothelial cells

OBJECTIVE: To observe the influence of different tocopherol isoforms on oxidized low density lipoprotein (oxLDL) or recombinant human C-reactive protein (rhCRP)-induced expression of intercellular adhesion molecule-1 (ICAM-1) in human umbilical vein endothelial cells (HUVECs) and to investigate the potential mechanisms and effects of different tocopherols on atherosclerosis. METHODS: Cultured HUVECs were incubated with oxLDL, oxLDL + alpha-tocopherol, oxLDL + gamma-tocopherol, oxLDL + mixed-tocopherols, rhCRP, rhCRP + alpha-tocopherol, rhCRP + gamma-tocopherol rhCRP + mixed-tocopherols for 24 hours, respectively. The ICAM-1 expressions of protein and mRNA were detected by cell enzyme linked immunosorbent assay (ELISA), flow cytometric technique and RT-PCR. RESULTS : Incubation of HUVECs with oxLDL or rhCRP for 24 hours significantly increased ICAM-1 expressions of proteins and mRNA. The different tocopherols inhibited oxLDL-induced ICAM-1 expression in HUVECs in a concentration-dependent manner (50-200 micromol/L) and mixed-tocopherols were more potent than alpha-tocopherol or gamma-tocopherol alone. However, rhCRP-induced ICAM-1 expression in HUVECs was not inhibited by tocopherols. CONCLUSION :The different tocopherols inhibited oxLDL-induced ICAM-1 expression in HUVECs and mixed-tocopherols were more potent than alpha-tocopherol or gamma-tocopherol alone, which may be important for the beneficial effects of tocopherols on atherosclerosis and cardiovascular disease.