目的探讨肾小管上皮细胞线粒体氧化损伤在肾间质纤维化中的作用机制。方法2015年6～12月期间，于本地动物实验中心选取60只健康雄性大鼠，根据处理方法的不同将其分为实验组和对照组，其中实验组行左侧输尿管结扎术．对照组则仅接受左...目的探讨肾小管上皮细胞线粒体氧化损伤在肾间质纤维化中的作用机制。方法2015年6～12月期间，于本地动物实验中心选取60只健康雄性大鼠，根据处理方法的不同将其分为实验组和对照组，其中实验组行左侧输尿管结扎术．对照组则仅接受左侧输尿管游离，14d后对两组大鼠的左侧肾脏中线粒体相关基因的表达情况、肾脏功能等参数进行检测分析。结果实验组大鼠术后14dmtDNA（1．49±0．12）、NRF1（1．87±0．17）、PGC1a（1．76±0．21）、Drp1（2．49±0．24）、Mfn2（2．45±0．27）的表达水平均明显高于对照组（1．07±0.23、1．11±0．29、1．05±0．32、1．14±0．35．1．17±0．14），差异具有统计学意义（P〈0．05）；术后14d，实验组大鼠肾脏组织中的cox（2．61±0．27）明显高于对照组的（1．07±0．19），SOD较对照组明显降低（0．55±0．16 vs 1．07±0．18），其RIF指数（22．76±1．39）明显高于对照组的（0．81±0．16），差异具有统计学意义（P〈0．05）。结论在肾间质纤维化中肾小管上皮细胞线粒体氧化损伤发挥着十分重要的作用，缺氧所造成的线粒体氧化损伤会造成肾小管功能受损，引起大量致纤维因子的产生，并从多途径引起肾间质纤维化。展开更多
Changes in mitochondrial morphology and function play an important role in secondary damage after acute spinal cord injury. We recorded the time representation of mitochondrial morphology and function in rats with acu...Changes in mitochondrial morphology and function play an important role in secondary damage after acute spinal cord injury. We recorded the time representation of mitochondrial morphology and function in rats with acute spinal cord injury. Results showed that mitochondria had an irregular shape, and increased in size. Mitochondrial cristae were disordered and mitochondrial membrane rupture was visible at 2–24 hours after injury. Fusion protein mitofusin 1 expression gradually increased, peaked at 8 hours after injury, and then decreased to its lowest level at 24 hours. Expression of dynamin-related protein 1, amitochondrial fission protein, showed the opposite kinetics. At 2–24 hours after acute spinal cord injury, malondialdehyde content, cytochrome c levels and caspase-3 expression were increased, but glutathione content, adenosine triphosphate content, Na＋-K＋-ATPase activity and mitochondrial membrane potential were gradually reduced. Furthermore, mitochondrial morphology altered during the acute stage of spinal cord injury. Fusion was important within the first 8 hours, but fission played a key role at 24 hours. Oxidative stress was inhibited, biological productivity was diminished, and mitochondrial membrane potential and permeability were reduced in the acute stage of injury. In summary, mitochondrial apoptosis is activated when the time of spinal cord injury is prolonged.展开更多
文摘目的探讨肾小管上皮细胞线粒体氧化损伤在肾间质纤维化中的作用机制。方法2015年6～12月期间，于本地动物实验中心选取60只健康雄性大鼠，根据处理方法的不同将其分为实验组和对照组，其中实验组行左侧输尿管结扎术．对照组则仅接受左侧输尿管游离，14d后对两组大鼠的左侧肾脏中线粒体相关基因的表达情况、肾脏功能等参数进行检测分析。结果实验组大鼠术后14dmtDNA（1．49±0．12）、NRF1（1．87±0．17）、PGC1a（1．76±0．21）、Drp1（2．49±0．24）、Mfn2（2．45±0．27）的表达水平均明显高于对照组（1．07±0.23、1．11±0．29、1．05±0．32、1．14±0．35．1．17±0．14），差异具有统计学意义（P〈0．05）；术后14d，实验组大鼠肾脏组织中的cox（2．61±0．27）明显高于对照组的（1．07±0．19），SOD较对照组明显降低（0．55±0．16 vs 1．07±0．18），其RIF指数（22．76±1．39）明显高于对照组的（0．81±0．16），差异具有统计学意义（P〈0．05）。结论在肾间质纤维化中肾小管上皮细胞线粒体氧化损伤发挥着十分重要的作用，缺氧所造成的线粒体氧化损伤会造成肾小管功能受损，引起大量致纤维因子的产生，并从多途径引起肾间质纤维化。
基金supported by the National Natural Science Foundation of China,No.81272074the Scientific Research Foundation Project for Doctors in Liaoning Province of China,No.20121094+1 种基金Aohongboze Graduate Sci-tech Innovation Foundationthe President Fund of Liaoning Medical University of China,No.2013003
文摘Changes in mitochondrial morphology and function play an important role in secondary damage after acute spinal cord injury. We recorded the time representation of mitochondrial morphology and function in rats with acute spinal cord injury. Results showed that mitochondria had an irregular shape, and increased in size. Mitochondrial cristae were disordered and mitochondrial membrane rupture was visible at 2–24 hours after injury. Fusion protein mitofusin 1 expression gradually increased, peaked at 8 hours after injury, and then decreased to its lowest level at 24 hours. Expression of dynamin-related protein 1, amitochondrial fission protein, showed the opposite kinetics. At 2–24 hours after acute spinal cord injury, malondialdehyde content, cytochrome c levels and caspase-3 expression were increased, but glutathione content, adenosine triphosphate content, Na＋-K＋-ATPase activity and mitochondrial membrane potential were gradually reduced. Furthermore, mitochondrial morphology altered during the acute stage of spinal cord injury. Fusion was important within the first 8 hours, but fission played a key role at 24 hours. Oxidative stress was inhibited, biological productivity was diminished, and mitochondrial membrane potential and permeability were reduced in the acute stage of injury. In summary, mitochondrial apoptosis is activated when the time of spinal cord injury is prolonged.
