In vivo levels of mitochondrial hydrogen peroxide increase with age in mtDNA mutator mice.

In vivo levels of mitochondrial hydrogen peroxide increase with age in mtDNA mutator mice.
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DOI:
10.1111/acel.12212
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发表时间:
2014-08
期刊:
影响因子:
7.8
通讯作者:
Murphy MP
Murphy MP
中科院分区:
生物学1区
文献类型:
--
作者:
Logan A;Shabalina IG;Prime TA;Rogatti S;Kalinovich AV;Hartley RC;Budd RC;Cannon B;Murphy MP

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在mtDNA突变小鼠中,mtDNA突变累积导致快速老化表型。然而,几乎没有证据表明组织的氧化损伤,并且当离体分析时,没有报道线粒体产生活性氧(ROS)超氧化物和过氧化氢的变化,破坏了衰老的线粒体氧化损伤理论。奇怪的是,降低体内线粒体ROS水平的干预措施延迟了衰老的发生。为了调和这些发现,我们使用了靶向线粒体的质谱探针MitoB来测量活小鼠线粒体内的过氧化氢。年轻的突变小鼠和对照小鼠的线粒体过氧化氢是相同的,但随着突变小鼠的年龄增长,过氧化氢增加。这表明体内mtDNA突变的长期存在增加了过氧化氢,这有助于加速衰老表型,可能是通过激活促凋亡和促炎氧化还原信号通路。
In mtDNA mutator mice, mtDNA mutations accumulate leading to a rapidly aging phenotype. However, there is little evidence of oxidative damage to tissues, and when analyzed ex vivo, no change in production of the reactive oxygen species (ROS) superoxide and hydrogen peroxide by mitochondria has been reported, undermining the mitochondrial oxidative damage theory of aging. Paradoxically, interventions that decrease mitochondrial ROS levels in vivo delay onset of aging. To reconcile these findings, we used the mitochondria-targeted mass spectrometry probe MitoB to measure hydrogen peroxide within mitochondria of living mice. Mitochondrial hydrogen peroxide was the same in young mutator and control mice, but as the mutator mice aged, hydrogen peroxide increased. This suggests that the prolonged presence of mtDNA mutations in vivo increases hydrogen peroxide that contributes to an accelerated aging phenotype, perhaps through the activation of pro-apoptotic and pro-inflammatory redox signaling pathways.
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