Is There Still Any Role for Oxidative Stress in Mitochondrial DNA-Dependent Aging?

Is There Still Any Role for Oxidative Stress in Mitochondrial DNA-Dependent Aging?
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DOI:
10.3390/genes9040175
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发表时间:
2018-03-21
期刊:
影响因子:
3.5
通讯作者:
Kunz WS
Kunz WS
中科院分区:
生物学3区
文献类型:
--
作者:
Zsurka G;Peeva V;Kotlyar A;Kunz WS

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最近的深度测序数据提供了令人信服的证据,证明衰老组织中线粒体DNA(mtDNA)的体细胞点突变谱缺乏G > T颠换突变。然而,这一事实不能作为活性氧(ROS)对与衰老相关的衰老的贡献缺失的论据,因为它可能是由线粒体DNA聚合酶γ(POLG)的核苷酸选择性引起的。与点突变相反,根据最近的实验数据,线粒体DNA缺失的年龄依赖性积累仍然可以通过ROS(特别是通过芬顿反应由H2O2形成的HO·自由基)的直接诱变效应产生的突变分子的分离来解释。ROS的来源仍然存在争议,因为线粒体对组织ROS产生的贡献可能比以前认为的要低。重要的是,在关于氧化应激在阿尔茨海默氏症依赖性衰老中的潜在作用的讨论中,炎症相关过程产生的ROS和游离铁的分布也需要仔细考虑。
Recent deep sequencing data has provided compelling evidence that the spectrum of somatic point mutations in mitochondrial DNA (mtDNA) in aging tissues lacks G > T transversion mutations. This fact cannot, however, be used as an argument for the missing contribution of reactive oxygen species (ROS) to mitochondria-related aging because it is probably caused by the nucleotide selectivity of mitochondrial DNA polymerase γ (POLG). In contrast to point mutations, the age-dependent accumulation of mitochondrial DNA deletions is, in light of recent experimental data, still explainable by the segregation of mutant molecules generated by the direct mutagenic effects of ROS (in particular, of HO· radicals formed from H2O2 by a Fenton reaction). The source of ROS remains controversial, because the mitochondrial contribution to tissue ROS production is probably lower than previously thought. Importantly, in the discussion about the potential role of oxidative stress in mitochondria-dependent aging, ROS generated by inflammation-linked processes and the distribution of free iron also require careful consideration.
发现聚合酶诱导的氧化核苷酸的细胞毒性。
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