title: Loss of PINK1 attenuates HIF-1α induction by preventing 4E-BP1-dependent switch in protein translation under hypoxia.
abstract: 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-1α protein, HIF-1α 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-1α pathway may contribute to PINK1-associated PD pathogenesis that manifests under cellular stress.
authors.affiliation: Department of Neurology, Committee on Neurobiology, and Department of Neurobiology, The University of Chicago, Chicago, Illinois 60637.
authors.forename: William
authors.initials: W
authors.lastname: Lin
authors.forename: Natasha L
authors.initials: NL
authors.lastname: Wadlington
authors.forename: Linan
authors.initials: L
authors.lastname: Chen
authors.forename: Xiaoxi
authors.initials: X
authors.lastname: Zhuang
authors.forename: James R
authors.initials: JR
authors.lastname: Brorson
authors.forename: Un Jung
authors.initials: UJ
authors.lastname: Kang
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000818:Animals; D015153:Blotting, Western; D002352:Carrier Proteins / Q000235:genetics / Q000502:physiology*; D018797:Cell Cycle Proteins; D002460:Cell Line; D002478:Cells, Cultured; D003513:Cycloheximide / Q000494:pharmacology; D018076:DNA, Complementary / Q000096:biosynthesis / Q000235:genetics; D039642:Eukaryotic Initiation Factors; D006861:Hydrogen Peroxide / Q000378:metabolism; D002534:Hypoxia, Brain / Q000378:metabolism*; D051795:Hypoxia-Inducible Factor 1, alpha Subunit / Q000096:biosynthesis* / Q000235:genetics; D007150:Immunohistochemistry; D008156:Luciferases / Q000235:genetics; D051379:Mice; D018345:Mice, Knockout; D010750:Phosphoproteins / Q000235:genetics / Q000502:physiology*; D010766:Phosphorylation; D010957:Plasmids / Q000235:genetics; D016133:Polymerase Chain Reaction; D014176:Protein Biosynthesis / Q000235:genetics / Q000502:physiology*; D011494:Protein Kinases / Q000235:genetics / Q000502:physiology*; D011500:Protein Synthesis Inhibitors / Q000494:pharmacology; D012314:RNA Cap Analogs / Q000378:metabolism; D034741:RNA, Small Interfering / Q000235:genetics; D000099202:PTEN-Induced Putative Kinase
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D002352:Carrier Proteins; D018797:Cell Cycle Proteins; D003513:Cycloheximide; D018076:DNA, Complementary; D039642:Eukaryotic Initiation Factors; D006861:Hydrogen Peroxide; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D008156:Luciferases; D010750:Phosphoproteins; D011494:Protein Kinases; D011500:Protein Synthesis Inhibitors; D012314:RNA Cap Analogs; D034741:RNA, Small Interfering; D000099202:PTEN-Induced Putative Kinase; C499527:Eif4ebp1 protein, mouse; C497443:Hif1a protein, mouse; C017516:7-methylguanosine triphosphate
keywords: 4EBP; IRES; PINK1; Parkinson's disease; hypoxia; translation