期刊
JOURNAL OF NEUROSCIENCE
卷 34, 期 8, 页码 3079-3089出版社
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.2286-13.2014
关键词
4EBP; hypoxia; IRES; Parkinson's disease; PINK1; translation
资金
- National Institutes of Health National Institute of Neurological Disorders and Stroke [NS053919]
- American Parkinson Disease Association Advanced Center for Research
Parkinson's disease (PD) has multiple proposed etiologies with implication of abnormalities in cellular homeostasis ranging from proteostasis to mitochondrial dynamics to energy metabolism. PINK1 mutations are associated with familial PD and here we discover a novel PINK1 mechanism in cellular stress response. Using hypoxia as a physiological trigger of oxidative stress and disruption in energy metabolism, we demonstrate that PINK1(-/-) mouse cells exhibited significantly reduced induction of HIF-1 alpha protein, HIF-1 alpha transcriptional activity, and hypoxia-responsive gene upregulation. Loss of PINK1 impairs both hypoxia-induced 4E-BP1 dephosphorylation and increase in the ratio of internal ribosomal entry site (IRES)-dependent to cap-dependent translation. These data suggest that PINK1 mediates adaptive responses by activating IRES-dependent translation, and the impairments in translation and the HIF-1 alpha pathway may contribute to PINK1-associated PD pathogenesis that manifests under cellular stress.
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