Background:Acute liver failure(ALF)is an unpredictable and life-threatening critical illness.The pathological characteristic of ALF is massive necrosis of hepatocytes and lots of inflammatory cells infiltration which ...Background:Acute liver failure(ALF)is an unpredictable and life-threatening critical illness.The pathological characteristic of ALF is massive necrosis of hepatocytes and lots of inflammatory cells infiltration which may lead to multiple organ failure.Methods:Animals were divided into 3 groups,normal,thioacetamide(TAA,ALF model)and TAA+AGK2.Cultured L02 cells were divided into 5 groups,normal,TAA,TAA+mitofusin 2(MFN2)-siRNA,TAA+AGK2,and TAA+AGK2+MFN2-siRNA groups.The liver histology was evaluated with hematoxylin and eosin staining,inositol-requiring enzyme 1(IRE1),activating transcription factor 6β(ATF6β),protein kinase R(PKR)-like endoplasmic reticulum kinase(PERK)and phosphorylated-PERK(p-PERK).C/EBP homologous protein(CHOP),reactive oxygen species(ROS),MFN2 and glutathione peroxidase 4(GPX4)were measured with Western blotting,and cell viability and liver chemistry were also measured.Mitochondriaassociated endoplasmic reticulum membranes(MAMs)were measured by immunofluorescence.Results:The liver tissue in the ALF group had massive inflammatory cell infiltration and hepatocytes necrosis,which were reduced by AGK2 pre-treatment.In comparison to the normal group,apoptosis rate and levels of IRE1,ATF6β,p-PERK,CHOP,ROS and Fe2+in the TAA-induced ALF model group were significantly increased,which were decreased by AGK2 pre-treatment.The levels of MFN2 and GPX4 were decreased in TAA-induced mice compared with the normal group,which were enhanced by AGK2 pretreatment.Compared with the TAA-induced L02 cell,apoptosis rate and levels of IRE1,ATF6β,p-PERK,CHOP,ROS and Fe2+were further increased and levels of MFN2 and GPX4 were decreased in the MFN2-siRNA group.AGK2 pre-treatment decreased the apoptosis rate and levels of IRE1,ATF6β,p-PERK,CHOP,ROS and Fe2+and enhanced the protein expression of MFN2 and GPX4 in MFN2-siRNA treated L02 cell.Immunofluorescence observation showed that level of MAMs was promoted in the AGK2 pre-treatment group when compared with the TAA-induced group in both mice and L02 cells.Conclusions:The data suggested that AGK2 pre-treatment had hepatoprotective role in TAA-induced ALF via upregulating the expression of MFN2 and then inhibiting PERK and ferroptosis pathway in ALF.展开更多
目的观察重组人促红细胞生成素(recombinant human erythropoietin,rhEPO)对缺血/再灌注损伤大鼠心肌细胞Mitofusin2(Mfn2)蛋白表达的影响及其抗心肌细胞凋亡的作用。方法选取成年SD大鼠35只,随机分为正常组(Normal),假手术组(Sham),缺...目的观察重组人促红细胞生成素(recombinant human erythropoietin,rhEPO)对缺血/再灌注损伤大鼠心肌细胞Mitofusin2(Mfn2)蛋白表达的影响及其抗心肌细胞凋亡的作用。方法选取成年SD大鼠35只,随机分为正常组(Normal),假手术组(Sham),缺血再灌注组(I/R),缺血再灌注EPO治疗组(I/R+EPO)。各组分别于再灌注3h和24h后,剪取心脏缺血/再灌注损伤区域,用脱氧核苷酸末端转移酶介导的缺口末端标记法(TUNEL)检测心肌细胞凋亡,免疫组化法检测Mfn2蛋白的表达。结果再灌注3h和24h后,与正常组和假手术组相比,I/R组Mfn2蛋白的表达和心肌细胞凋亡均显著增加;与I/R组相比,I/R+EPO组Mfn2蛋白的表达和心肌细胞凋亡均显著降低。结论EPO可以下调缺血再灌注损伤后心肌细胞Mfn2蛋白的表达,抑制心肌细胞的凋亡。展开更多
目的观察胰岛素抵抗(IR)及改善后骨骼肌过氧化物酶体增生物激活受体γ共激活因子1α(PGC-1α)和线粒体融合蛋白2(Mfn2)的表达变化及线粒体形态和参数的变化。方法成年Wistar大鼠随机分为对照组(NC)、高脂组(HF)和高脂罗格列酮干预组(HF+...目的观察胰岛素抵抗(IR)及改善后骨骼肌过氧化物酶体增生物激活受体γ共激活因子1α(PGC-1α)和线粒体融合蛋白2(Mfn2)的表达变化及线粒体形态和参数的变化。方法成年Wistar大鼠随机分为对照组(NC)、高脂组(HF)和高脂罗格列酮干预组(HF+RSG)。喂养4周及8周时,清醒状态下用正常葡萄糖高胰岛素钳夹技术评价IR;第8周时,实时定量PCR和Western blot检测骨骼肌PGC-1α和Mfn2的表达;透射电镜观察骨骼肌线粒体的形态;Im-age-Pro Plus 6分析线粒体的各项参数。结果高脂喂养4周后HF组与HF+RSG组IR状态形成。继续喂养4周后,HF+RSG组由于服用罗格列酮IR状态改善明显。与NC组相比,HF组的PGC-1α和Mfn2均显著下降(P<0.05);与HF组相比,HF+RSG组上述两基因的表达均显著升高(P<0.05);而与NC组相比,HF+RSG组PGC-1α的表达没有明显差异,而Mfn2的表达仍较低。与其余两组相比,HF组线粒体的形态和各项参数也发生了明显的改变(P<0.05)。结论胰岛素抵抗状态的形成与PGC-1α和Mfn2的表达下降有关,也与线粒体的改变有关。展开更多
基金supported by the grant from the National Natural Science Foundation of China (82070609)
文摘Background:Acute liver failure(ALF)is an unpredictable and life-threatening critical illness.The pathological characteristic of ALF is massive necrosis of hepatocytes and lots of inflammatory cells infiltration which may lead to multiple organ failure.Methods:Animals were divided into 3 groups,normal,thioacetamide(TAA,ALF model)and TAA+AGK2.Cultured L02 cells were divided into 5 groups,normal,TAA,TAA+mitofusin 2(MFN2)-siRNA,TAA+AGK2,and TAA+AGK2+MFN2-siRNA groups.The liver histology was evaluated with hematoxylin and eosin staining,inositol-requiring enzyme 1(IRE1),activating transcription factor 6β(ATF6β),protein kinase R(PKR)-like endoplasmic reticulum kinase(PERK)and phosphorylated-PERK(p-PERK).C/EBP homologous protein(CHOP),reactive oxygen species(ROS),MFN2 and glutathione peroxidase 4(GPX4)were measured with Western blotting,and cell viability and liver chemistry were also measured.Mitochondriaassociated endoplasmic reticulum membranes(MAMs)were measured by immunofluorescence.Results:The liver tissue in the ALF group had massive inflammatory cell infiltration and hepatocytes necrosis,which were reduced by AGK2 pre-treatment.In comparison to the normal group,apoptosis rate and levels of IRE1,ATF6β,p-PERK,CHOP,ROS and Fe2+in the TAA-induced ALF model group were significantly increased,which were decreased by AGK2 pre-treatment.The levels of MFN2 and GPX4 were decreased in TAA-induced mice compared with the normal group,which were enhanced by AGK2 pretreatment.Compared with the TAA-induced L02 cell,apoptosis rate and levels of IRE1,ATF6β,p-PERK,CHOP,ROS and Fe2+were further increased and levels of MFN2 and GPX4 were decreased in the MFN2-siRNA group.AGK2 pre-treatment decreased the apoptosis rate and levels of IRE1,ATF6β,p-PERK,CHOP,ROS and Fe2+and enhanced the protein expression of MFN2 and GPX4 in MFN2-siRNA treated L02 cell.Immunofluorescence observation showed that level of MAMs was promoted in the AGK2 pre-treatment group when compared with the TAA-induced group in both mice and L02 cells.Conclusions:The data suggested that AGK2 pre-treatment had hepatoprotective role in TAA-induced ALF via upregulating the expression of MFN2 and then inhibiting PERK and ferroptosis pathway in ALF.
文摘目的观察重组人促红细胞生成素(recombinant human erythropoietin,rhEPO)对缺血/再灌注损伤大鼠心肌细胞Mitofusin2(Mfn2)蛋白表达的影响及其抗心肌细胞凋亡的作用。方法选取成年SD大鼠35只,随机分为正常组(Normal),假手术组(Sham),缺血再灌注组(I/R),缺血再灌注EPO治疗组(I/R+EPO)。各组分别于再灌注3h和24h后,剪取心脏缺血/再灌注损伤区域,用脱氧核苷酸末端转移酶介导的缺口末端标记法(TUNEL)检测心肌细胞凋亡,免疫组化法检测Mfn2蛋白的表达。结果再灌注3h和24h后,与正常组和假手术组相比,I/R组Mfn2蛋白的表达和心肌细胞凋亡均显著增加;与I/R组相比,I/R+EPO组Mfn2蛋白的表达和心肌细胞凋亡均显著降低。结论EPO可以下调缺血再灌注损伤后心肌细胞Mfn2蛋白的表达,抑制心肌细胞的凋亡。
文摘目的观察胰岛素抵抗(IR)及改善后骨骼肌过氧化物酶体增生物激活受体γ共激活因子1α(PGC-1α)和线粒体融合蛋白2(Mfn2)的表达变化及线粒体形态和参数的变化。方法成年Wistar大鼠随机分为对照组(NC)、高脂组(HF)和高脂罗格列酮干预组(HF+RSG)。喂养4周及8周时,清醒状态下用正常葡萄糖高胰岛素钳夹技术评价IR;第8周时,实时定量PCR和Western blot检测骨骼肌PGC-1α和Mfn2的表达;透射电镜观察骨骼肌线粒体的形态;Im-age-Pro Plus 6分析线粒体的各项参数。结果高脂喂养4周后HF组与HF+RSG组IR状态形成。继续喂养4周后,HF+RSG组由于服用罗格列酮IR状态改善明显。与NC组相比,HF组的PGC-1α和Mfn2均显著下降(P<0.05);与HF组相比,HF+RSG组上述两基因的表达均显著升高(P<0.05);而与NC组相比,HF+RSG组PGC-1α的表达没有明显差异,而Mfn2的表达仍较低。与其余两组相比,HF组线粒体的形态和各项参数也发生了明显的改变(P<0.05)。结论胰岛素抵抗状态的形成与PGC-1α和Mfn2的表达下降有关,也与线粒体的改变有关。
