A role for TSPO in mitochondrial Ca(2+) homeostasis and redox stress signaling.

A role for TSPO in mitochondrial Ca(2+) homeostasis and redox stress signaling.
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DOI:
10.1038/cddis.2017.186
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发表时间:
2017-06-22
影响因子:
9
通讯作者:
Campanella M
Campanella M
中科院分区:
生物学1区
文献类型:
--
作者:
Gatliff J;East DA;Singh A;Alvarez MS;Frison M;Matic I;Ferraina C;Sampson N;Turkheimer F;Campanella M

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18 kDa转运蛋白TSPO定位于线粒体外膜(OMM)上。它在神经炎症部位系统性过表达,被用作大脑状况的生物标志物。TSPO通过限制PARK2介导的线粒体泛素化(经由活性氧(ROS)的细胞器周围积累)来抑制线粒体的自噬去除。在这里,我们描述了TSPO去调节线粒体Ca2+信号传导,导致细胞溶质Ca2+池的平行增加,所述细胞溶质Ca2+池激活Ca2+依赖性NADPH氧化酶(NOX),从而增加ROS。TSPO对线粒体Ca2+摄取的抑制是蛋白激酶A(PKA)对电压依赖性阴离子通道(VDAC 1)磷酸化的结果,PKA与含3的酰基辅酶A结合结构域(ACBD 3)复合,被募集到线粒体中。值得注意的是,神经递质谷氨酸在年龄依赖性条件下导致神经元毒性,触发这种TSPO依赖性细胞信号传导机制,导致细胞死亡。因此,TSPO被提出作为一种新的基于OMM的途径来控制细胞内Ca2+动力学和神经元细胞毒性中的氧化还原瞬变。
The 18 kDa translocator protein TSPO localizes on the outer mitochondrial membrane (OMM). Systematically overexpressed at sites of neuroinflammation it is adopted as a biomarker of brain conditions. TSPO inhibits the autophagic removal of mitochondria by limiting PARK2-mediated mitochondrial ubiquitination via a peri-organelle accumulation of reactive oxygen species (ROS). Here we describe that TSPO deregulates mitochondrial Ca2+ signaling leading to a parallel increase in the cytosolic Ca2+ pools that activate the Ca2+-dependent NADPH oxidase (NOX) thereby increasing ROS. The inhibition of mitochondrial Ca2+ uptake by TSPO is a consequence of the phosphorylation of the voltage-dependent anion channel (VDAC1) by the protein kinase A (PKA), which is recruited to the mitochondria, in complex with the Acyl-CoA binding domain containing 3 (ACBD3). Notably, the neurotransmitter glutamate, which contributes neuronal toxicity in age-dependent conditions, triggers this TSPO-dependent mechanism of cell signaling leading to cellular demise. TSPO is therefore proposed as a novel OMM-based pathway to control intracellular Ca2+ dynamics and redox transients in neuronal cytotoxicity.
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