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The Importance of Mitophagy in Maintaining Mitochondrial Function in U373MG Cells. Bafilomycin A1 Restores Aminochrome-Induced Mitochondrial Damage

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Molecular & Clinical Pharmacology, ICBM, Faculty of Medicine, University of Chile, Santiago, Chile
*E-mail: [email protected]
Cite this: ACS Chem. Neurosci. 2017, 8, 10, 2247–2253
Publication Date (Web):August 1, 2017
https://doi.org/10.1021/acschemneuro.7b00152
Copyright © 2017 American Chemical Society
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    Aminochrome, an orthoquinone formed during the dopamine oxidation of neuromelanin, is neurotoxic because it induces mitochondria dysfunction, protein degradation dysfunction (both autophagy and proteasomal systems), α-synuclein aggregation to neurotoxic oligomers, neuroinflammation, and oxidative and endoplasmic reticulum stress. In this study, we investigated the relationship between aminochrome-induced autophagy/lysosome dysfunction and mitochondrial dysfunction in U373MGsiGST6 cells. Aminochrome (75 μM) induces mitochondrial dysfunction as determined by (i) a significant decrease in ATP levels (70%; P < 0.001) and (ii) a significant decrease in mitochondrial membrane potential (P < 0.001). Interestingly, the pretreatment of U373MGsiGST6 cells with 100 nM bafilomycin-A1, an inhibitor of lysosomal vacuolar-type H+-ATPase, restores ATP levels, mitochondrial membrane potential, and mitophagy, and decreases cell death. These results reveal (i) the importance of macroautophagy/the lysosomal degradation system for the normal functioning of mitochondria and for cell survival, and (ii) aminochrome-induced lysosomal dysfunction depends on the aminochrome-dependent inactivation of the vacuolar-type H+-ATPase, which pumps protons into the lysosomes. This study also supports the proposed protective role of glutathione transferase mu2–2 (GSTM2) in astrocytes against aminochrome toxicity, mediated by mitochondrial and lysosomal dysfunction.

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