title: Oxidation of DJ-1-dependent cell transformation through direct binding of DJ-1 to PTEN.
abstract: DJ-1 is an oncogene and also a causative gene for a familial form of Parkinson's disease. DJ-1 has multiple functions, including anti-oxidative stress reaction and cysteine 106 (C106) of DJ-1 is an essential amino acid for DJ-1 to exert its function. While increased expression and secretion of DJ-1 into serum in patients with various cancers and regulation of p53 and PTEN by DJ-1 have been reported, the molecular mechanism underlying oncogenicity of DJ-1 is poorly understood. Here, we analyzed the function of DJ-1 in the PI3'K signaling pathway under an oxidative stress condition, focusing on the interaction of DJ-1 with PTEN. We found that both wild-type (wt) and C106S-DJ-1, a substitution mutant of DJ-1, directly bound to PTEN and inhibited PTEN phosphatase activity but that C106S-DJ-1 more strongly inhibited the activity than did wt-DJ-1. When NIH3T3 cells were treated with H2O2, oxidation of C106 of wt-DJ-1 occurred, accompanied by increased binding of wt-DJ-1 to PTEN, decreased PTEN activity and increased phosphorylation of AKT. C106S-DJ-1 transformed cells more strongly than did wt-DJ-1 and the transforming activity of DJ-1 was enhanced by H2O2 treatment of cells in which increased binding of DJ-1 to PTEN and decreased PTEN activity were observed. Furthermore, TOF-MS analysis of the oxidative status of C106 suggested that DJ-1 activity requires the presence of the reduced form of C106, which accounts for >50% of the total form. These results suggest that the oxidative status of DJ-1 regulates PTEN activity, leading to cell proliferation and transformation.
authors.affiliation: Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan.
authors.forename: Yun-Chul
authors.initials: YC
authors.lastname: Kim
authors.forename: Hirotake
authors.initials: H
authors.lastname: Kitaura
authors.forename: Takahiro
authors.initials: T
authors.lastname: Taira
authors.forename: Sanae M M
authors.initials: SM
authors.lastname: Iguchi-Ariga
authors.forename: Hiroyoshi
authors.initials: H
authors.lastname: Ariga
mesh_terms: D000818:Animals; D015153:Blotting, Western; D002471:Cell Transformation, Neoplastic / Q000378:metabolism*; D005455:Fluorescent Antibody Technique; D006861:Hydrogen Peroxide / Q000494:pharmacology; D047468:Immunoprecipitation; D051379:Mice; D041681:NIH 3T3 Cells; D015513:Oncogene Proteins / Q000378:metabolism*; D016877:Oxidants / Q000494:pharmacology*; D010084:Oxidation-Reduction; D018384:Oxidative Stress / Q000502:physiology*; D051059:PTEN Phosphohydrolase / Q000378:metabolism*; D054464:Peroxiredoxins; D000071617:Protein Deglycase DJ-1; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D015513:Oncogene Proteins; D016877:Oxidants; D006861:Hydrogen Peroxide; D054464:Peroxiredoxins; C503466:PARK7 protein, mouse; D000071617:Protein Deglycase DJ-1; D051059:PTEN Phosphohydrolase