title: Down regulation of DJ-1 enhances cell death by oxidative stress, ER stress, and proteasome inhibition.
abstract: Mutations in DJ-1 gene have been linked to autosomal recessive early onset parkinsonism (AR-EOP). Although the mechanism of neuronal cell death due to DJ-1 mutation has not been fully elucidated, loss of DJ-1 function was considered to cause the phenotype. Here, we demonstrated that the down regulation of endogenous DJ-1 of the neuronal cell line by siRNA enhanced the cell death which was induced by oxidative stress, ER stress, and proteasome inhibition, but not by pro-apoptotic stimulus. The cell death with hydrogen peroxide was dramatically rescued by over-expression of wild-type DJ-1, but not by that of L166P mutant DJ-1. Furthermore, DJ-1 rescued the cell death caused by over-expression of Pael receptor, which was a substrate of Parkin, another gene product for autosomal recessive juvenile parkinsonism. These results suggest that loss of protective activity of DJ-1 from neuro-toxicity induced by these stresses contributes to neuronal cell death in AR-EOP with mutant DJ-1.
authors.affiliation: Department of Neurology and Neurological Science, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, 113-8519, Tokyo, Japan. tak-yokota.nuro@tmd.ac.jp
authors.forename: Takanori
authors.initials: T
authors.lastname: Yokota
authors.forename: Kanako
authors.initials: K
authors.lastname: Sugawara
authors.forename: Kaoru
authors.initials: K
authors.lastname: Ito
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Takahashi
authors.forename: Hiroyoshi
authors.initials: H
authors.lastname: Ariga
authors.forename: Hidehiro
authors.initials: H
authors.lastname: Mizusawa
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D017209:Apoptosis; D002460:Cell Line; D045744:Cell Line, Tumor; D003546:Cysteine Endopeptidases / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D015536:Down-Regulation; D004721:Endoplasmic Reticulum / Q000187:drug effects / Q000378:metabolism*; D006801:Humans; D006861:Hydrogen Peroxide / Q000494:pharmacology; D047908:Intracellular Signaling Peptides and Proteins; D007668:Kidney / Q000187:drug effects / Q000378:metabolism*; D051379:Mice; D009097:Multienzyme Complexes / Q000037:antagonists & inhibitors / Q000378:metabolism*; D009154:Mutation; D009447:Neuroblastoma / Q000378:metabolism*; D015513:Oncogene Proteins / Q000235:genetics / Q000378:metabolism*; D018384:Oxidative Stress / Q000187:drug effects; D046988:Proteasome Endopeptidase Complex; D000071617:Protein Deglycase DJ-1; D011994:Recombinant Proteins / Q000378:metabolism; D019311:Staurosporine / Q000494:pharmacology; D013329:Structure-Activity Relationship
chemical_list: D000900:Anti-Bacterial Agents; D047908:Intracellular Signaling Peptides and Proteins; D009097:Multienzyme Complexes; D015513:Oncogene Proteins; D011994:Recombinant Proteins; D006861:Hydrogen Peroxide; C105131:PARK7 protein, human; D000071617:Protein Deglycase DJ-1; D003546:Cysteine Endopeptidases; D046988:Proteasome Endopeptidase Complex; D019311:Staurosporine