Gatliff, J and East, D A and Singh, A and Alvarez, M S and Frison, M and Matic, I and Ferraina, C and Sampson, N and Turkheimer, F and Campanella, M (2017) A role for TSPO in mitochondrial Ca2+ homeostasis and redox stress signaling. CELL DEATH & DISEASE, 8. e2896.
![]() |
Text
10929.pdf - Published Version Available under License Creative Commons Attribution. Download (3MB) |
Abstract
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.
Item Type: | Article |
---|---|
RVC Publication Type: | Research (full) paper |
WoS ID: | 000405895200006 |
DOI: | https://doi.org/10.1038/cddis.2017.186 |
Departments: | Comparative Biomedical Sciences |
Research Programmes: | Comparative Physiology & Medicine > Immune Regulation and Cancer |
Depositing User: | RVC Auto-import |
Last Modified: | 21 Nov 2020 02:19 |
URI: | https://researchonline.rvc.ac.uk/id/eprint/10929 |
Date Deposited: | 22 August 2017 |
Actions (Repository Editors)
![]() |
View Item |