Putative roles of Ca2+‐independent phospholipase A2 in respiratory chain‐associated ROS production in brain mitochondria: influence of docosahexaenoic acid and bromoenol lactone
Putative roles of Ca2+‐independent phospholipase A2 in respiratory chain‐associated ROS production in brain mitochondria: influence of docosahexaenoic acid and bromoenol lactone
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Ca2“独立磷脂酶 A2 在呼吸链相关的脑线粒体 ROS 产生中的假定作用:二十二碳六烯酸和溴烯醇内酯的影响”
DOI:
10.1111/jnc.12789
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发表时间:
2014
影响因子:
4.7
通讯作者:
M. Strokin
中科院分区:
文献类型:
--
作者:
Nordmann;M. Strokin
Ca2+‐independent phospholipase A2(iPLA2) is hypothesized to control mitochondrial reactive oxygen species (ROS) generation. Here, we modulated the influence of iPLA2‐induced liberation of non‐esterified free fatty acids on ROS generation associated with the electron transport chain. We demonstrate enzymatic activity of membrane‐associated iPLA2in native, energized rat brain mitochondria (RBM). Theoretically, enhanced liberation of free fatty acids by iPLA2modulates mitochondrial ROS generation, either attenuating the reversed electron transport (RET) or deregulating the forward electron transport of electron transport chain. For mimicking such conditions, we probed the effect of docosahexaenoic acid (DHA), a major iPLA2product on ROS generation. We demonstrate that the adenine nucleotide translocase partly mediates DHA‐induced uncoupling, and that low micromolar DHA concentrations diminish RET‐dependent ROS generation. Uncoupling proteins have no effect, but the adenine nucleotide translocase inhibitor carboxyatractyloside attenuates DHA‐linked uncoupling effect on RET‐dependent ROS generation. Under physiological conditions of forward electron transport, low micromolar DHA stimulates ROS generation. Finally, exposure of RBM to the iPLA2inhibitor bromoenol lactone (BEL) enhanced ROS generation. BEL diminished RBM glutathione content. BEL‐treated RBM exhibits reduced Ca2+retention capacity and partial depolarization. Thus, we rebut the view that iPLA2attenuates oxidative stress in brain mitochondria. However, the iPLA2inhibitor BEL has detrimental activities on energy‐dependent mitochondrial functions. The Ca2+‐independent phospholipase A2(iPLA2), a FFA (free fatty acids)‐generating membrane‐attached mitochondrial phospholipase, is potential to regulate ROS (reactive oxygen species) generation by mitochondria. FFA can either decrease reversed electron transport (RET)‐linked or enhance forward electron transport (FET)‐linked ROS generation. In the physiological mode of FET, iPLA2activity increases ROS generation. The iPLA2inhibitor BEL exerts detrimental effects on energy‐dependent mitochondrial functions.
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DOI:
10.1111/j.1432-1033.1975.tb04003.x
发表时间:
1975
期刊:
European journal of biochemistry
影响因子:
--
作者:
Martin Klingenberg;Karin Grebe;Burkhard Scherer
通讯作者:
Burkhard Scherer
DOI:
10.1042/bj3620023
发表时间:
2002-02
期刊:
The Biochemical journal
影响因子:
--
作者:
Scott D Williams;R. Gottlieb
通讯作者:
Scott D Williams;R. Gottlieb
影响因子:
4.3
作者:
Jezek, P;Engstovà, H;Garlid, KD
通讯作者:
Garlid, KD
DOI:
10.1111/j.1432-1033.1970.tb01086.x
发表时间:
1970
期刊:
European journal of biochemistry
影响因子:
--
作者:
M. J. Weidemann;H. Erdelt;M. Klingenberg
通讯作者:
M. Klingenberg
DOI:
10.1016/s0021-9258(17)37098-9
发表时间:
1994-03
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
E. Ackermann;E. Kempner;E. Dennis
通讯作者:
E. Ackermann;E. Kempner;E. Dennis