ROS Control Mitochondrial Motility through p38 and the Motor Adaptor Miro/Trak.

ROS Control Mitochondrial Motility through p38 and the Motor Adaptor Miro/Trak.
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DOI:
10.1016/j.celrep.2017.10.060
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发表时间:
2017-11-07
期刊:
影响因子:
8.8
通讯作者:
Hajnóczky G
Hajnóczky G
中科院分区:
生物学1区
文献类型:
--
作者:
Debattisti V;Gerencser AA;Saotome M;Das S;Hajnóczky G

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线粒体分布和运动被认为是许多细胞功能的中心,但它们通过信号机制的调节仍有待阐明。在这里,我们报告了来自细胞外来源或细胞内生成的ROS,通过剂量依赖性,特异性和可逆地降低大鼠海马原代培养神经元和细胞系的线粒体运动性来控制线粒体分布和功能。活性氧降低运动性独立于细胞质[Ca2+],线粒体膜电位或通透性过渡孔打开,已知的氧化应激效应。然而,多种遗传和药理学证据支持ros激活的MAP激酶p38α是运动抑制所必需的。此外,将线粒体直接锚定在运动蛋白上,而不涉及细胞器和运动蛋白之间的生理衔接器,可以防止h2o2诱导的线粒体运动性下降。因此,ROS参与p38α和运动适配器复合体来施加线粒体运动性的变化,这可能具有生理和病理生理的相关性。
Mitochondrial distribution and motility are recognized as central to many cellular functions but their regulation by signaling mechanisms remains to be elucidated. Here we report that ROS, either derived from an extracellular source or intracellularly generated, controls mitochondrial distribution and function, by dose-dependently, specifically and reversibly decreasing mitochondrial motility in both rat hippocampal primary cultured neurons and cell lines. ROS decrease motility independently of cytoplasmic [Ca2+], mitochondrial membrane potential or permeability transition pore opening, known effectors of oxidative stress. However, multiple lines of genetic and pharmacological evidence support that a ROS-activated MAP kinase, p38α is required for the motility inhibition. Furthermore, anchoring mitochondria directly to kinesins without involvement of the physiological adaptors between the organelles and the motor protein prevents the H2O2–induced decrease in mitochondrial motility. Thus, ROS engage p38α and the motor adaptor complex to exert changes in mitochondrial motility, which likely has both physiological and pathophysiological relevance.
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