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The permeability transition pore as a pathway for the release of mitochondrial DNA

机译:渗透性过渡孔作为线粒体DNA释放的途径

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This study shows that under oxidative stress DNA from liver mitochondria (mtDNA) can be released through the non-specific permeability transition pore. Pore opening was induced after the addition of Fe2+ and hydrogen peroxide, in the presence of calcium ions. Under these conditions mitochondria undergo large extent swelling, accompanied by the generation of thiobarbituric acid-reactive substances. It was observed that mtDNA was hydrolyzed after the oxidative stress, and it is proposed that some of the fragments were released from the matrix, in such a way that approximately 12% of the total mtDNA remained in the mitochondria. The remaining genetic material was analyzed, after its extraction in an agarose gel. The fragments released were smaller that 1000 bp, by analysis in a native 8% polyacrilamide gel. The presence of cyclosporin A, that inhibited permeability transition, also inhibited mtDNA release by roughly 52%. (c) 2005 Elsevier Inc. All rights reserved.
机译:这项研究表明,在氧化应激下,来自肝线粒体(mtDNA)的DNA可以通过非特异性通透性过渡孔释放。在钙离子存在的情况下,添加Fe2 +和过氧化氢后,会引起开孔。在这些条件下,线粒体发生较大程度的肿胀,并伴随着硫代巴比妥酸反应性物质的产生。观察到氧化应激后mtDNA被水解,有人提出一些片段从基质中释放出来,使得总mtDNA中约12%保留在线粒体中。在琼脂糖凝胶中提取剩余的遗传物质后,对其进行了分析。通过在天然8%聚丙烯酰胺凝胶中进行分析,释放的片段小于1000 bp。抑制通透性转变的环孢菌素A的存在也抑制了mtDNA释放约52%。 (c)2005 Elsevier Inc.保留所有权利。

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