Superoxide flashes in single mitochondria.
Superoxide flashes in single mitochondria.
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单线粒体中的超氧化物闪光
DOI:
10.1016/j.cell.2008.06.017
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发表时间:
2008-07-25
期刊:
影响因子:
64.5
通讯作者:
Cheng, Heping
中科院分区:
文献类型:
--
作者:
Wang, Wang;Fang, Huaqiang;Groom, Linda;Cheng, Aiwu;Zhang, Wanrui;Liu, Jie;Wang, Xianhua;Li, Kaitao;Han, Peidong;Zheng, Ming;Yin, Jinhu;Wang, Weidong;Mattson, Mark P.;Kao, Joseph P. Y.;Lakatta, Edward G.;Sheu, Shey-Shing;Ouyang, Kunfu;Chen, Ju;Dirksen, Robert T.;Cheng, Heping
The mitochondrion is the primary source of reactive oxygen species (ROS) in eukaryotic cells. With the aid of a novel mitochondrial matrix-targeted superoxide indicator, here we show that individual mitochondria undergo spontaneous bursts of superoxide generation, termed “superoxide flashes”. Superoxide flashes occur randomly in space and time, exhibit all-or-none properties, and reflect elementary events of superoxide production within single mitochondria across a wide diversity of cells. Individual flashes are triggered by transient openings of the mitochondrial permeability transition pore (mPTP) and are fueled by electron transfer complexes-dependent superoxide production. While decreased during cardiac hypoxia/anoxia, a flurry of superoxide flash activity contributes to the destructive rebound ROS burst observed during early reoxygenation after anoxia. The discovery of superoxide flashes reveals a novel mechanism for quantal ROS production by individual mitochondria and substantiates the central role of mPTP in oxidative stress related pathology in addition to its well-known role in apoptosis.
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