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
M. Strokin
中科院分区:
医学2区
文献类型:
--
作者:
Nordmann;M. Strokin

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假设非Ca 2+依赖性磷脂酶A2(iPLA 2)控制线粒体活性氧(ROS)的产生。在这里,我们调节了iPLA 2诱导的非酯化游离脂肪酸释放对与电子传递链相关的ROS产生的影响。我们证明了膜相关的iPLA 2在天然的、能量化的大鼠脑线粒体(RBM)中的酶活性。从理论上讲,iPLA 2促进游离脂肪酸的释放调节了线粒体ROS的产生,减弱了电子传递链的反向电子传递(RET)或解除了电子传递链的正向电子传递。为了模拟这样的条件,我们探索了二十二碳六烯酸(DHA),一种主要的iPLA 2产品对ROS生成的影响。我们证明腺嘌呤核苷酸移位酶部分介导DHA诱导的解偶联,并且低微摩尔DHA浓度减少RET依赖的ROS产生。解偶联蛋白没有影响,但腺嘌呤核苷酸移位酶抑制剂羧基糖苷减弱了DHA对RET依赖性ROS产生的相关解偶联作用。在正向电子传递的生理条件下,低微摩尔DHA刺激ROS产生。最后,暴露于iPLA 2抑制剂溴烯醇内酯(BEL)的RBM增强了ROS的产生。BEL降低RBM谷胱甘肽含量。BEL处理的RBM表现出降低的Ca2+保留能力和部分去极化。因此,我们反驳了iPLA 2减弱脑线粒体氧化应激的观点。然而,iPLA2抑制剂BEL对能量依赖性线粒体功能具有有害活性。 Ca2+非依赖性磷脂酶A2(iPLA 2)是一种产生FFA(游离脂肪酸)的膜附着线粒体磷脂酶,具有调节线粒体ROS(活性氧)产生的潜力。FFA可以减少反向电子传递(RET)相关或增强正向电子传递(FET)相关的ROS生成。在FET的生理模式中,iPLA 2活性增加ROS产生。iPLA 2抑制剂BEL对能量依赖性线粒体功能产生有害影响。
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.
白术酸和羧基白术酸与线粒体的结合。
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
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发表时间: 2002-02
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DOI: 10.1016/s0005-2728(98)00084-x
发表时间: 1998-06-10
影响因子: 4.3
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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
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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:
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通讯作者: E. Ackermann;E. Kempner;E. Dennis