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Potential roles of PINK1 for increased PGC-1α-mediated mitochondrial fatty acid oxidation and their associations with Alzheimer disease and diabetes.

Mitochondrion. 2014 Sep;18:41-8. Epub 2014 Sep 23
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摘要


Down-regulation of PINK1 and PGC-1α proteins is implicated in both mitochondrial dysfunction and oxidative stress potentially linking metabolic abnormality and neurodegeneration. Here, we report that PGC-1α and PINK1 expression is markedly decreased in Alzheimer disease (AD) and diabetic brains. We observed a significant down-regulation of PGC-1α and PINK1 protein expression in H2O2-treated cells but not in those cells treated with N-acetyl cysteine. The protein levels of two key enzymes of the mitochondrial β-oxidation machinery, acyl-coenzyme A dehydrogenase, very long chain (ACADVL) and mitochondrial trifunctional enzyme subunit α are significantly decreased in AD and diabetic brains. Moreover, we observed a positive relationship between ACADVL and 64 kDa PINK1 protein levels in AD and diabetic brains. Overexpression of PGC-1α decreases lipid-droplet accumulation and increases mitochondrial fatty acid oxidation; down-regulation of PINK1 abolishes these effects. Together, these results provide new insights into potential cooperative roles of PINK1 and PGC-1α in mitochondrial fatty acid oxidation, suggesting possible regulatory roles for mitochondrial function in the pathogenesis of AD and diabetes.

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