Objective Mitochondrial reactive oxygen species(mtROS)could cause damage to pancreaticβ-cells,rendering them susceptible to oxidative damage.Hence,investigating the potential of the mitochondriatargeted antioxidant(M...Objective Mitochondrial reactive oxygen species(mtROS)could cause damage to pancreaticβ-cells,rendering them susceptible to oxidative damage.Hence,investigating the potential of the mitochondriatargeted antioxidant(Mito-TEMPO)to protect pancreaticβ-cells from ferroptosis by mitigating lipid peroxidation becomes crucial.Methods MIN6 cells were cultured in vitro with 100μmol/L sodium palmitate(SP)to simulate diabetes.FerroOrange was utilized for the detection of Fe2+fluorescence staining,BODIPY581/591C11 for lipid reactive oxygen species,and MitoSox-Red for mtROS.Alterations in mitophagy levels were assessed through the co-localization of lysosomal and mitochondrial fluorescence.Western blotting was employed to quantify protein levels of Acsl4,GPX4,FSP1,FE,PINK1,Parkin,TOMM20,P62,and LC3.Subsequently,interventions were implemented using Mito-TEMPO and Carbonyl cyanide 3-chlorophenylhydrazone(CCCP)to observe changes in ferroptosis and mitophagy within MIN6 cells.Results We found that SP induced a dose-dependent increase in Fe2+and lipid ROS in MIN6 cells while decreasing the expression levels of GPX4 and FSP1 proteins.Through bioinformatics analysis,it has been uncovered that mitophagy assumes a crucial role within the ferroptosis pathway associated with diabetes.Additionally,SP decreased the expression of mitophagy-related proteins PINK1 and Parkin,leading to mtROS overproduction.Conversely,Mito-TEMPO effectively eliminated mtROS while activating the mitophagy pathways involving PINK1 and Parkin,thereby reducing the occurrence of ferroptosis in MIN6 cells.CCCP also demonstrated efficacy in reducing ferroptosis in MIN6 cells.Conclusion In summary,Mito-TEMPO proved effective in attenuating mtROS production and initiating mitophagy pathways mediated by PINK1 and Parkin in MIN6 cells.Consequently,this decreased iron overload and lipid peroxidation,ultimately safeguarding the cells from ferroptosis.展开更多
目的探讨LIGHT(lymphotoxin like,exhibits inducible expression and competes with HSV glycoprotein D for HVEM,a receptor expressed by T lymphocytes)协同γ-干扰素(interferon-gamma,IFN-γ)诱导小鼠胰岛β细胞株MIN6细胞凋亡...目的探讨LIGHT(lymphotoxin like,exhibits inducible expression and competes with HSV glycoprotein D for HVEM,a receptor expressed by T lymphocytes)协同γ-干扰素(interferon-gamma,IFN-γ)诱导小鼠胰岛β细胞株MIN6细胞凋亡的作用及机制。方法 LIGHT、IFN-γ单独或联合处理MIN6细胞。分别运用CCK-8法、流式细胞术检测MIN6细胞增殖与凋亡率。Western blot检测信号转导和转录激活子1(signal transducers and activators of transcription 1,STAT1)及STAT1的磷酸化水平,以及凋亡与增殖相关基因Bcl-xL、Bax和增殖细胞核抗原(PCNA)的表达。MIN6细胞经STAT1特异的抑制剂弗达拉滨(fludarabine,Flu)预处理后再用LIGHT和IFN-γ联合处理,Western blot检测STAT1、p-STAT1、Bcl-xL、Bax的变化,CCK-8法检测MIN6细胞的增殖能力。结果 LIGHT协同IFN-γ呈时间依赖性抑制MIN6细胞增殖,诱导细胞凋亡,降低抗凋亡基因Bcl-xL表达、增加促凋亡基因Bax表达,对PCNA表达无明显影响;LIGHT促进IFN-γ激活STAT1,而STAT1抑制剂fludarabine抑制STAT1活化后,Bcl-xL表达上调,Bax表达下调,MIN6细胞增殖率上升。结论 LIGHT协同IFN-γ通过激活STAT1调节Bcl-xL、Bax表达而诱导小鼠胰岛β细胞株MIN6细胞凋亡。展开更多
基金supported by a grant from the Science and Technology Tackling Programme Project of Xinjiang Production and Construction Corps(2021AB030).
文摘Objective Mitochondrial reactive oxygen species(mtROS)could cause damage to pancreaticβ-cells,rendering them susceptible to oxidative damage.Hence,investigating the potential of the mitochondriatargeted antioxidant(Mito-TEMPO)to protect pancreaticβ-cells from ferroptosis by mitigating lipid peroxidation becomes crucial.Methods MIN6 cells were cultured in vitro with 100μmol/L sodium palmitate(SP)to simulate diabetes.FerroOrange was utilized for the detection of Fe2+fluorescence staining,BODIPY581/591C11 for lipid reactive oxygen species,and MitoSox-Red for mtROS.Alterations in mitophagy levels were assessed through the co-localization of lysosomal and mitochondrial fluorescence.Western blotting was employed to quantify protein levels of Acsl4,GPX4,FSP1,FE,PINK1,Parkin,TOMM20,P62,and LC3.Subsequently,interventions were implemented using Mito-TEMPO and Carbonyl cyanide 3-chlorophenylhydrazone(CCCP)to observe changes in ferroptosis and mitophagy within MIN6 cells.Results We found that SP induced a dose-dependent increase in Fe2+and lipid ROS in MIN6 cells while decreasing the expression levels of GPX4 and FSP1 proteins.Through bioinformatics analysis,it has been uncovered that mitophagy assumes a crucial role within the ferroptosis pathway associated with diabetes.Additionally,SP decreased the expression of mitophagy-related proteins PINK1 and Parkin,leading to mtROS overproduction.Conversely,Mito-TEMPO effectively eliminated mtROS while activating the mitophagy pathways involving PINK1 and Parkin,thereby reducing the occurrence of ferroptosis in MIN6 cells.CCCP also demonstrated efficacy in reducing ferroptosis in MIN6 cells.Conclusion In summary,Mito-TEMPO proved effective in attenuating mtROS production and initiating mitophagy pathways mediated by PINK1 and Parkin in MIN6 cells.Consequently,this decreased iron overload and lipid peroxidation,ultimately safeguarding the cells from ferroptosis.
文摘目的探讨LIGHT(lymphotoxin like,exhibits inducible expression and competes with HSV glycoprotein D for HVEM,a receptor expressed by T lymphocytes)协同γ-干扰素(interferon-gamma,IFN-γ)诱导小鼠胰岛β细胞株MIN6细胞凋亡的作用及机制。方法 LIGHT、IFN-γ单独或联合处理MIN6细胞。分别运用CCK-8法、流式细胞术检测MIN6细胞增殖与凋亡率。Western blot检测信号转导和转录激活子1(signal transducers and activators of transcription 1,STAT1)及STAT1的磷酸化水平,以及凋亡与增殖相关基因Bcl-xL、Bax和增殖细胞核抗原(PCNA)的表达。MIN6细胞经STAT1特异的抑制剂弗达拉滨(fludarabine,Flu)预处理后再用LIGHT和IFN-γ联合处理,Western blot检测STAT1、p-STAT1、Bcl-xL、Bax的变化,CCK-8法检测MIN6细胞的增殖能力。结果 LIGHT协同IFN-γ呈时间依赖性抑制MIN6细胞增殖,诱导细胞凋亡,降低抗凋亡基因Bcl-xL表达、增加促凋亡基因Bax表达,对PCNA表达无明显影响;LIGHT促进IFN-γ激活STAT1,而STAT1抑制剂fludarabine抑制STAT1活化后,Bcl-xL表达上调,Bax表达下调,MIN6细胞增殖率上升。结论 LIGHT协同IFN-γ通过激活STAT1调节Bcl-xL、Bax表达而诱导小鼠胰岛β细胞株MIN6细胞凋亡。
文摘本研究主要探讨D-柠檬烯对衣霉素(Tm)诱导胰腺MIN6细胞损伤的保护作用。设置溶剂对照组、Tm组、4-苯基丁酸(PBA)组和不同浓度的D-柠檬烯组,用Griess试剂检测Tm刺激胰岛β细胞产生的NO水平;Annexin V-FITC/PI双染法流式检测细胞凋亡; RT-PCR法检测mRNA的表达水平; Western Blot法检测相关蛋白的表达。结果显示,D-柠檬烯组与Tm组相比,NO产生量减少、细胞凋亡率降低、内质网应激相关基因sXbp1和CHOP的mRNA表达量显著降低、p-eIF2α的蛋白表达量显著下降。结果表明D-柠檬烯对衣霉素(Tm)诱导的胰腺MIN6细胞损伤具有显著的保护作用。
