Objective:To investigate effect of oleanolic acid(OA)on atherosclerosis and its related mechanisms.Methods:Human umbilical vein endothelial cells(HUVECs)were injured by oxidized low-density lipoprotein for 24 h and tr...Objective:To investigate effect of oleanolic acid(OA)on atherosclerosis and its related mechanisms.Methods:Human umbilical vein endothelial cells(HUVECs)were injured by oxidized low-density lipoprotein for 24 h and treated with OA,and the levels of cell proliferation,migration,adhesion,and apoptosis were evaluated by BrdU staining,scratch healing assay,monocyte-endothelial cell adhesion assay and flow cytometry.The mice were fed with a high-fat diet to induce an atherosclerosis model,and treated with OA by gastric gavage.The mice were divided into the control group,the model group,and the OA administration group.The blood lipid and plaque formation in mice were detected.In addition,oxidative stress and mitochondrial structure and function changes in cells and mice were evaluated by transmission electron microscopy,JC-1 fluorescent probe,and Western blotting assays.The expression levels of proteins in the AMPK/Drp1 pathway were examined through Western blot.Results:OA markedly increased cell viability and migration rate of HUVECs,and decreased the adhesion rate of THP-1 cells and the apoptosis rate.OA significantly reduced serum lipid levels,such as total cholesterol and triglyceride,in mice and inhibited plaque formation in the aorta.OA also significantly increased the content of superoxide dismutase and catalase,alleviated mitochondrial damage,such as mitochondrial swelling and mitochondrial cristae reduction,reduced the number of mitochondria,increased adenosine triphosphate content,and significantly reduced p-Drp1(Ser616)/Drp1,MFF and FIS1 levels,increased p-AMPK/AMPK levels,activated AMPK,and then regulated DRP1 activity.Conclusions:OA activates AMPK,which in turn regulates the activity of DRP1 to restore normal mitochondrial dynamics and reduce atherosclerosis.展开更多
目的:基于miR-451a靶向磷酸甘油酸变位酶(PGAM5)-线粒体动力相关蛋白1(Drp1)轴调控线粒体动力学,探讨温肺降浊方对氧糖剥夺/复氧(OGD/R)诱导HT22模型的效应机制。方法:建立OGD/R诱导HT22细胞模型,设立正常对照组、OGD/R组、miR-451a过...目的:基于miR-451a靶向磷酸甘油酸变位酶(PGAM5)-线粒体动力相关蛋白1(Drp1)轴调控线粒体动力学,探讨温肺降浊方对氧糖剥夺/复氧(OGD/R)诱导HT22模型的效应机制。方法:建立OGD/R诱导HT22细胞模型,设立正常对照组、OGD/R组、miR-451a过表达组、miR-451a敲低组、温肺降浊方含药血清(WFJZF)组、miR-451a过表达+WFJZF组、miR-451a敲低+WFJZF组和miR-451a空载体组,双荧光素酶确定miR-451a和PGAM5的转录关系,免疫蛋白共沉淀确定PGAM5和Drp1的调控作用,慢病毒转染miR-451a于HT22细胞中,qRT-PCR确定转染效率,CCK-8测定缺糖缺氧状态下细胞活性的最佳时间点,qRT-PCR和Westem Blot检测HT22模型细胞内DGAM5-Drp1轴蛋白及mRNA的表达水平。结果:OGD/R诱导HT22细胞持续2 h为最佳时间点,miR-451a可以靶向调控PGAM5基因,PGAM5和Drp1具有相互调控作用。与正常对照组比较,OGD/R组细胞内PGAM5、Drp1和Fis1蛋白及mRNA表达上升,p-Drp1 Ser 616磷酸化表达上升(P<0.05),OPA1蛋白及mRNA表达下降,p-Drp1 Ser 637去磷酸化表达下降(P<0.05);与OGD/R组比较,miR-451a过表达+WFJZF组细胞内PGAM5、Drp1和Fis1蛋白及mRNA表达下降,p-Drp1 Ser 616磷酸化表达下降(P<0.05),OPA1蛋白及mRNA表达上升,p-Drp1 Ser 637去磷酸化表达上升(P<0.05)。结论:miR-451a可以靶向调控PGAM5-Drp1轴,miR-451a过表达+WFJZF组可以改善线粒体失衡状态,减少神经元过度损伤,发挥脑保护效应。展开更多
目的:探讨缺氧-复氧(hypoxia/reoxygenation,H/R)后人近曲肾小管上皮细胞(HK-2)内动力相关蛋白1(Dynamin related protein 1,DRP1)及视神经萎缩症蛋白1(optic atrophy,OPA1)表达的变化。方法:以人近曲肾小管上皮细胞株为研究对象,将培...目的:探讨缺氧-复氧(hypoxia/reoxygenation,H/R)后人近曲肾小管上皮细胞(HK-2)内动力相关蛋白1(Dynamin related protein 1,DRP1)及视神经萎缩症蛋白1(optic atrophy,OPA1)表达的变化。方法:以人近曲肾小管上皮细胞株为研究对象,将培养细胞随机分为正常对照组和H/R组。正常对照组常规培养,H/R组先缺氧24h,然后复氧培养6h。光镜观察细胞形态变化,CCK-8检测细胞活力,透射电子显微镜观察线粒体形态改变,免疫组织化学法检测细胞内DRP1和OPA1蛋白表达。结果:H/R组与对照组相比,细胞活力下降,线粒体出现凋亡相关改变,OPA1表达减少而DRP1的表达增加。结论:缺氧-复氧可导致HK-2细胞发生凋亡相关改变,其机制可能与诱导线粒体形态相关蛋白DRP1、OPA1的表达改变相关。展开更多
线粒体动力相关蛋白(dynamin-related protein 1,Drp1)是介导线粒体分裂的主要蛋白,Drp1表达增加,线粒体分裂增加,网状结构破坏,反之则有助线粒体融合,促进损伤线粒体修复。心肌缺血再灌注损伤与活性氧(ROS)的大量产生,线粒体通透性转换...线粒体动力相关蛋白(dynamin-related protein 1,Drp1)是介导线粒体分裂的主要蛋白,Drp1表达增加,线粒体分裂增加,网状结构破坏,反之则有助线粒体融合,促进损伤线粒体修复。心肌缺血再灌注损伤与活性氧(ROS)的大量产生,线粒体通透性转换孔(MPTP)的开放及细胞凋亡等密切相关。近年来大量研究发现Drp1介导的线粒体分裂参与心肌缺血再灌注损伤,本文就Drp1参与心肌缺血再灌注损伤的相关机制作一简要综述。展开更多
文摘Objective:To investigate effect of oleanolic acid(OA)on atherosclerosis and its related mechanisms.Methods:Human umbilical vein endothelial cells(HUVECs)were injured by oxidized low-density lipoprotein for 24 h and treated with OA,and the levels of cell proliferation,migration,adhesion,and apoptosis were evaluated by BrdU staining,scratch healing assay,monocyte-endothelial cell adhesion assay and flow cytometry.The mice were fed with a high-fat diet to induce an atherosclerosis model,and treated with OA by gastric gavage.The mice were divided into the control group,the model group,and the OA administration group.The blood lipid and plaque formation in mice were detected.In addition,oxidative stress and mitochondrial structure and function changes in cells and mice were evaluated by transmission electron microscopy,JC-1 fluorescent probe,and Western blotting assays.The expression levels of proteins in the AMPK/Drp1 pathway were examined through Western blot.Results:OA markedly increased cell viability and migration rate of HUVECs,and decreased the adhesion rate of THP-1 cells and the apoptosis rate.OA significantly reduced serum lipid levels,such as total cholesterol and triglyceride,in mice and inhibited plaque formation in the aorta.OA also significantly increased the content of superoxide dismutase and catalase,alleviated mitochondrial damage,such as mitochondrial swelling and mitochondrial cristae reduction,reduced the number of mitochondria,increased adenosine triphosphate content,and significantly reduced p-Drp1(Ser616)/Drp1,MFF and FIS1 levels,increased p-AMPK/AMPK levels,activated AMPK,and then regulated DRP1 activity.Conclusions:OA activates AMPK,which in turn regulates the activity of DRP1 to restore normal mitochondrial dynamics and reduce atherosclerosis.
文摘目的:基于miR-451a靶向磷酸甘油酸变位酶(PGAM5)-线粒体动力相关蛋白1(Drp1)轴调控线粒体动力学,探讨温肺降浊方对氧糖剥夺/复氧(OGD/R)诱导HT22模型的效应机制。方法:建立OGD/R诱导HT22细胞模型,设立正常对照组、OGD/R组、miR-451a过表达组、miR-451a敲低组、温肺降浊方含药血清(WFJZF)组、miR-451a过表达+WFJZF组、miR-451a敲低+WFJZF组和miR-451a空载体组,双荧光素酶确定miR-451a和PGAM5的转录关系,免疫蛋白共沉淀确定PGAM5和Drp1的调控作用,慢病毒转染miR-451a于HT22细胞中,qRT-PCR确定转染效率,CCK-8测定缺糖缺氧状态下细胞活性的最佳时间点,qRT-PCR和Westem Blot检测HT22模型细胞内DGAM5-Drp1轴蛋白及mRNA的表达水平。结果:OGD/R诱导HT22细胞持续2 h为最佳时间点,miR-451a可以靶向调控PGAM5基因,PGAM5和Drp1具有相互调控作用。与正常对照组比较,OGD/R组细胞内PGAM5、Drp1和Fis1蛋白及mRNA表达上升,p-Drp1 Ser 616磷酸化表达上升(P<0.05),OPA1蛋白及mRNA表达下降,p-Drp1 Ser 637去磷酸化表达下降(P<0.05);与OGD/R组比较,miR-451a过表达+WFJZF组细胞内PGAM5、Drp1和Fis1蛋白及mRNA表达下降,p-Drp1 Ser 616磷酸化表达下降(P<0.05),OPA1蛋白及mRNA表达上升,p-Drp1 Ser 637去磷酸化表达上升(P<0.05)。结论:miR-451a可以靶向调控PGAM5-Drp1轴,miR-451a过表达+WFJZF组可以改善线粒体失衡状态,减少神经元过度损伤,发挥脑保护效应。
文摘目的:探讨缺氧-复氧(hypoxia/reoxygenation,H/R)后人近曲肾小管上皮细胞(HK-2)内动力相关蛋白1(Dynamin related protein 1,DRP1)及视神经萎缩症蛋白1(optic atrophy,OPA1)表达的变化。方法:以人近曲肾小管上皮细胞株为研究对象,将培养细胞随机分为正常对照组和H/R组。正常对照组常规培养,H/R组先缺氧24h,然后复氧培养6h。光镜观察细胞形态变化,CCK-8检测细胞活力,透射电子显微镜观察线粒体形态改变,免疫组织化学法检测细胞内DRP1和OPA1蛋白表达。结果:H/R组与对照组相比,细胞活力下降,线粒体出现凋亡相关改变,OPA1表达减少而DRP1的表达增加。结论:缺氧-复氧可导致HK-2细胞发生凋亡相关改变,其机制可能与诱导线粒体形态相关蛋白DRP1、OPA1的表达改变相关。
文摘线粒体动力相关蛋白(dynamin-related protein 1,Drp1)是介导线粒体分裂的主要蛋白,Drp1表达增加,线粒体分裂增加,网状结构破坏,反之则有助线粒体融合,促进损伤线粒体修复。心肌缺血再灌注损伤与活性氧(ROS)的大量产生,线粒体通透性转换孔(MPTP)的开放及细胞凋亡等密切相关。近年来大量研究发现Drp1介导的线粒体分裂参与心肌缺血再灌注损伤,本文就Drp1参与心肌缺血再灌注损伤的相关机制作一简要综述。
