TLR4激动对内皮细胞粘附功能的影响及阿托伐他汀的干预研究

目的：观察Toll样受体4（TLR4）激动对脐静脉内皮细胞（HUVECs）氧化低密度脂蛋白受体LOX-1的调节和对单核细胞与HUVECs粘附率的影响，以及LOX-1在内皮细胞粘附功能中的作用，并观察阿托伐他汀的干预作用方法：RT-PCR方法检测TLR4、LOX-1 mRNA表达水平，流式细胞术检测TLR4、LOX-1蛋白表达水平，细胞计数法计算单核细胞与HUVECs粘附率。结果：脂多糖(1 mg/L) 孵育24 h上调HUVECs TLR4、LOX-1 mRNA和蛋白的表达，增加单核细胞与HUVECs粘附率,抗LOX-1抗体部分抑制LPS介导的单核细胞与HUVECs粘附率的增加，阿托伐他汀（10 μmol/L）抑制脂多糖介导的上述效应。结论：TLR4激动上调LOX-1表达及增加内皮细胞粘附功能，LOX-1在LPS介导的单核内皮细胞粘附功能中起部分作用，阿托伐他汀可能通过抑制TLR4表达及TLR4 介导的LOX-1表达而发挥其内皮细胞保护作用。

Effect of TLR4 activation on endothelium adhesion function and atorvastatin intervention

AIM：To investigate the modulation of LOX-1 and monocyte-endothelium adhesion by TLR4 activation in human umbilical vein endothelial cells (HUVECs),and explore LOX-1’s role in mediating monocyte-endothelium adhesion,and the effect of atorvastatin.METHODS：TLR4 and LOX-1 mRNA were measured by RT-PCR.The expression percentage of TLR4 and LOX-1 positive cells were detected by flow cytometry.The adhesive percentage between monocytes and HUVECs were determined by counting.RESULTS：Incubation by LPS (1 mg/L) for 24 hours upregulated TLR4,LOX-1 mRNA and protein expression in HUVECs，and increased the percentage of monocyte adhesion to endothelium.Pretreatment of cell with anti-LOX-1 partly abolished the increase of monocyte adhesion to endothelium.Atorvastatin (10 μmol/L) inhibited LPS-mediated effects above.CONCLUSION：TLR4 activation upregulates LOX-1 expression and increases monocyte-endothelium adhesion.LOX-1 partly involves in LPS-induced monocyte-endothelium adhesion,atorvastatin may have protective effects on endothelium by inhibiting TLR4 and TLR4-induced LOX-1 expression.