目的 研究蟛蜞菊内酯(WEL)对人脐静脉内皮细胞(HUVECs)炎症损伤的保护作用及其分子机制.方法 建立过氧化氢(H2O2)诱导HUVECs氧化应激损伤模型,给予200 μmol·L-1H2O2处理24 h.实验分组:正常对照组、二甲亚砜(DMSO)组、H2O2组、WEL组(20 μmol·L-1).通过噻唑蓝(MTT)法检测各组细胞存活率,流式细胞术检测细胞内活性氧(ROS)水平,荧光显微镜观察各分组细胞p62蛋白表达情况.Western blotting测定细胞中mTOR、p-mTOR、PI3K、p-PI3K、SOD1等蛋白表达水平.结果 与H2O2组比较,WEL组HUVECs细胞存活率升高(P<0.01),细胞内ROS减少,SOD1表达增强,自噬体膜上p62蛋白聚集增多;与H2O2损伤组相比,WEL能明显增加损伤后HUVECs的p-mTOR蛋白表达水平(P<0.01).结论 WEL可通过抑制H2O2诱导的HUVECs炎症损伤,从而抑制HUVECs自噬,这一作用与WEL促进PI3K、Akt、mTOR蛋白的磷酸化,抑制自噬,从而抵抗HUVECs细胞氧化应激损伤有关.
Objective To study the protective effect of Wedelolactone(WEL)against inflammatory injury in human umbilical vein endothelial cells(HUVECs)and its molecular mechanism by inducing PI3K/Akt/mTOR.Methods The model of atherosclerosis(AS)oxidative stress injury in HUVECs was induced with 200 μmol·L-1 of hydrogen peroxide for 24 h.The experimental groups were as follows:normal control group,DMSO(dimethyl sulfoxide)group,H2O2 group,and WEL group.MTT was used to measure the cell survival rate of each group;flow cytometry was used to assess intracellular ROS levels;fluorescence microscopy was used to detect the expression of p62 protein;immunoblotting assay was used to determine the protein expression levels for apoptosis-related proteins associated with PI3K/Akt/mTOR signaling pathway and autophagy-related proteins.Results Compared with the H2 O2 group,the HUVEC cell survival rate was significantly inhibited in the WEL group(P<0.05).ROS production was significantly lower,and the protein expressions of SOD1 and p62 were significantly increased in the WEL group as compared to the hydrogen peroxide group.The protein expression of p-mTOR,p-Akt,and p-PI3K was significantly decreased in hydrogen peroxide(P<0.01);In the WEL experiment,p-mTOR,p-Akt,and p-PI3K were increased significantly in the post-injury HUVECs(P<0.01).Conclusion Wedelolactone inhibits HUVECs'autophagy by suppressing H2O2-induced inflammatory damage in HUVECs,which may be related to the fact that WEL promotes the phosphorylation of PI3K,Akt,and mTOR proteins,inhibits autophagy and thus resists oxidative stress damage in HUVECs cells.