title: MKP-1 mRNA stabilization and translational control by RNA-binding proteins HuR and NF90.
abstract: The mitogen-activated protein (MAP) kinase phosphatase 1 (MKP-1) plays a major role in dephosphorylating and thereby inactivating the MAP kinases extracellular signal-regulated kinase (ERK), c-Jun N-terminal kinase (JNK), and p38. Here, we examine the posttranscriptional events underlying the robust MKP-1 induction by oxidants in HeLa cells. H(2)O(2) treatment potently stabilized the MKP-1 mRNA and increased the association of MKP-1 mRNA with the translation machinery. Four RNA-binding proteins (RNA-BPs) that influence mRNA turnover and/or translation (HuR, NF90, TIAR, and TIA-1) were found to bind to biotinylated transcripts spanning the MKP-1 AU-rich 3' untranslated region. By using ribonucleoprotein immunoprecipitation analysis, we showed that H(2)O(2) treatment increased the association of MKP-1 mRNA with HuR and NF90 and decreased its association with the translational repressors TIAR and TIA-1. HuR or NF90 silencing significantly diminished the H(2)O(2)-stimulated MKP-1 mRNA stability; HuR silencing also markedly decreased MKP-1 translation. In turn, lowering MKP-1 expression in HuR-silenced cultures resulted in substantially elevated phosphorylation of JNK and p38 after H(2)O(2) treatment. Collectively, MKP-1 upregulation by oxidative stress is potently influenced by increased mRNA stability and translation, mediated at least in part by the RNA-BPs HuR and NF90.
authors.affiliation: Laboratory of Cellular and Molecular Biology, National Institute on Aging-Intramural Research Program, National Institutes of Health, Baltimore, Maryland 21228, USA.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Kuwano
authors.forename: Hyeon Ho
authors.initials: HH
authors.lastname: Kim
authors.forename: Kotb
authors.initials: K
authors.lastname: Abdelmohsen
authors.forename: Rudolf
authors.initials: R
authors.lastname: Pullmann
authors.forename: Jennifer L
authors.initials: JL
authors.lastname: Martindale
authors.forename: Xiaoling
authors.initials: X
authors.lastname: Yang
authors.forename: Myriam
authors.initials: M
authors.lastname: Gorospe
mesh_terms: D020413:3' Untranslated Regions / Q000378:metabolism; D000954:Antigens, Surface / Q000378:metabolism*; D003593:Cytoplasm / Q000378:metabolism; D054638:Dual Specificity Phosphatase 1 / Q000235:genetics*; D051959:ELAV Proteins; D000067780:ELAV-Like Protein 1; D006367:HeLa Cells; D006801:Humans; D006861:Hydrogen Peroxide / Q000494:pharmacology; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D050779:Nuclear Factor 90 Proteins / Q000378:metabolism*; D018384:Oxidative Stress; D014176:Protein Biosynthesis; D020871:RNA Stability / Q000187:drug effects; D012333:RNA, Messenger / Q000378:metabolism*; D016601:RNA-Binding Proteins / Q000378:metabolism*; D011994:Recombinant Proteins / Q000235:genetics; D015854:Up-Regulation
chemical_list: D020413:3' Untranslated Regions; D000954:Antigens, Surface; D051959:ELAV Proteins; D000067780:ELAV-Like Protein 1; C098770:ELAVL1 protein, human; C429643:ILF3 protein, human; D050779:Nuclear Factor 90 Proteins; D012333:RNA, Messenger; D016601:RNA-Binding Proteins; D011994:Recombinant Proteins; D006861:Hydrogen Peroxide; D020928:Mitogen-Activated Protein Kinases; C517019:DUSP1 protein, human; D054638:Dual Specificity Phosphatase 1