目的研究高糖高脂对心肌细胞的影响及视神经萎缩症蛋白1(optical atrophy-1,OPA1)在其中的具体作用。方法将高糖培养基培养的小鼠心肌细胞分为3组:高糖+0、200、400μmol/L软脂酸钠组,并分别干预8 h和16 h。采用si RNA敲低心肌OPA1表达...目的研究高糖高脂对心肌细胞的影响及视神经萎缩症蛋白1(optical atrophy-1,OPA1)在其中的具体作用。方法将高糖培养基培养的小鼠心肌细胞分为3组:高糖+0、200、400μmol/L软脂酸钠组,并分别干预8 h和16 h。采用si RNA敲低心肌OPA1表达,进一步将400μmol/L软脂酸钠组分为对照组、OPA1 si RNA干预组、Scra si RNA干预组、OPA1 si RNA+NAC干预组。通过流式细胞仪检测各组心肌细胞在不同时间点的凋亡水平,q-PCR法检测心肌细胞中OPA1m RNA的表达情况,DHE染色法与ELISA试剂盒测定心肌细胞中活性氧簇(reactive oxygen species,ROS)水平。结果心肌细胞凋亡水平随着软脂酸钠的浓度和干预时间逐渐增加(P<0.05)。与对照组相比,高脂干预明显抑制心肌细胞中OPA1的表达,同时显著地促进ROS生成(P<0.05)。通过OPA1 si RNA干扰OPA1的表达水平后,高脂诱导的心肌细胞凋亡与ROS生成进一步增加(P<0.05);相反地,抗氧化剂N-乙酰半胱氨酸(N-acetyl-L-cysteine,NAC)逆转了上述OPA1抑制所导致的心肌细胞凋亡。结论高脂血症会进一步增加糖尿病心肌细胞的易损性,OPA1可以通过抑制氧化应激反应促进伴有高脂血症糖尿病条件下的心肌细胞存活。展开更多
Dominant optic atrophy has been associated with mutations in the OPA1 gene, which encodes for a dynamin- related GTPase, a mitochondrial protein implicated in the formation and maintenance of mitochondrial network and...Dominant optic atrophy has been associated with mutations in the OPA1 gene, which encodes for a dynamin- related GTPase, a mitochondrial protein implicated in the formation and maintenance of mitochondrial network and morphology. We used phosphorus magnetic resonance spectroscopy to assess calf muscle oxidative metabolism in six patients from two unrelated families carrying the c.2708- 2711delTTAG deletion in exon 27 of the OPA1 gene. The rate of postexercise phosphocreatine resynthesis, a measure of mitochondrial adenosine triphosphate production rate, was significantly delayed in the patients. Our in vivo results show for the first time to our knowledge a deficit of oxidative phosphorylation in OPA1- related DOA.展开更多
文摘目的研究高糖高脂对心肌细胞的影响及视神经萎缩症蛋白1(optical atrophy-1,OPA1)在其中的具体作用。方法将高糖培养基培养的小鼠心肌细胞分为3组:高糖+0、200、400μmol/L软脂酸钠组,并分别干预8 h和16 h。采用si RNA敲低心肌OPA1表达,进一步将400μmol/L软脂酸钠组分为对照组、OPA1 si RNA干预组、Scra si RNA干预组、OPA1 si RNA+NAC干预组。通过流式细胞仪检测各组心肌细胞在不同时间点的凋亡水平,q-PCR法检测心肌细胞中OPA1m RNA的表达情况,DHE染色法与ELISA试剂盒测定心肌细胞中活性氧簇(reactive oxygen species,ROS)水平。结果心肌细胞凋亡水平随着软脂酸钠的浓度和干预时间逐渐增加(P<0.05)。与对照组相比,高脂干预明显抑制心肌细胞中OPA1的表达,同时显著地促进ROS生成(P<0.05)。通过OPA1 si RNA干扰OPA1的表达水平后,高脂诱导的心肌细胞凋亡与ROS生成进一步增加(P<0.05);相反地,抗氧化剂N-乙酰半胱氨酸(N-acetyl-L-cysteine,NAC)逆转了上述OPA1抑制所导致的心肌细胞凋亡。结论高脂血症会进一步增加糖尿病心肌细胞的易损性,OPA1可以通过抑制氧化应激反应促进伴有高脂血症糖尿病条件下的心肌细胞存活。
文摘Dominant optic atrophy has been associated with mutations in the OPA1 gene, which encodes for a dynamin- related GTPase, a mitochondrial protein implicated in the formation and maintenance of mitochondrial network and morphology. We used phosphorus magnetic resonance spectroscopy to assess calf muscle oxidative metabolism in six patients from two unrelated families carrying the c.2708- 2711delTTAG deletion in exon 27 of the OPA1 gene. The rate of postexercise phosphocreatine resynthesis, a measure of mitochondrial adenosine triphosphate production rate, was significantly delayed in the patients. Our in vivo results show for the first time to our knowledge a deficit of oxidative phosphorylation in OPA1- related DOA.
