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      Negative regulation of IL-17-mediated signaling and inflammation by ubiquitin-specific protease 25

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          Abstract

          Interleukin 17 (IL-17) plays an important role in infection and autoimmunity; how it signals remains poorly understood. In this study, we identified ubiquitin-specific protease 25 (USP25) as a negative regulator of IL-17-mediated signaling and inflammation. Overexpression of USP25 inhibited IL-17-triggered signaling, while USP25 deficiency resulted in increased phosphorylation of IκBα and Jnk, increased expression of chemokines and cytokines as well as prolonged half-life of Cxcl1 mRNA following IL-17 treatment. Consistently, Usp25 -/- mice exhibited increased sensitivity to IL-17-dependent inflammation and autoimmunity in vivo. Mechanistically, IL-17 stimulation induced the association of USP25 with TRAF5 and TRAF6 and USP25 induced removal of Act1-mediated K63-linked ubiquitination in TRAF5 and TRAF6. Thus, our results demonstrate that USP25 is a deubiquitinating enzyme (DUB) that negatively regulates IL-17-triggered signaling.

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          A distinct lineage of CD4 T cells regulates tissue inflammation by producing interleukin 17.

          Heon Park, Zhaoxia Li, Xuexian O. Yang … (2005)
          Interleukin 17 (IL-17) has been linked to autoimmune diseases, although its regulation and function have remained unclear. Here we have evaluated in vitro and in vivo the requirements for the differentiation of naive CD4 T cells into effector T helper cells that produce IL-17. This process required the costimulatory molecules CD28 and ICOS but was independent of the cytokines and transcription factors required for T helper type 1 or type 2 differentiation. Furthermore, both IL-4 and interferon-gamma negatively regulated T helper cell production of IL-17 in the effector phase. In vivo, antibody to IL-17 inhibited chemokine expression in the brain during experimental autoimmune encephalomyelitis, whereas overexpression of IL-17 in lung epithelium caused chemokine production and leukocyte infiltration. Thus, IL-17 expression characterizes a unique T helper lineage that regulates tissue inflammation.
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            Regulation and cellular roles of ubiquitin-specific deubiquitinating enzymes.

            Francisca E. Reyes-Turcu, Karen Ventii, Keith Wilkinson (2009)
            Deubiquitinating enzymes (DUBs) are proteases that process ubiquitin or ubiquitin-like gene products, reverse the modification of proteins by a single ubiquitin(-like) protein, and remodel polyubiquitin(-like) chains on target proteins. The human genome encodes nearly 100 DUBs with specificity for ubiquitin in five gene families. Most DUB activity is cryptic, and conformational rearrangements often occur during the binding of ubiquitin and/or scaffold proteins. DUBs with specificity for ubiquitin contain insertions and extensions modulating DUB substrate specificity, protein-protein interactions, and cellular localization. Binding partners and multiprotein complexes with which DUBs associate modulate DUB activity and substrate specificity. Quantitative studies of activity and protein-protein interactions, together with genetic studies and the advent of RNAi, have led to new insights into the function of yeast and human DUBs. This review discusses ubiquitin-specific DUBs, some of the generalizations emerging from recent studies of the regulation of DUB activity, and their roles in various cellular processes.
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              Activation of the IkappaB kinase complex by TRAF6 requires a dimeric ubiquitin-conjugating enzyme complex and a unique polyubiquitin chain.

              Li Deng, Chen Wang, Erika Spencer … (2000)
              TRAF6 is a signal transducer in the NF-kappaB pathway that activates IkappaB kinase (IKK) in response to proinflammatory cytokines. We have purified a heterodimeric protein complex that links TRAF6 to IKK activation. Peptide mass fingerprinting analysis reveals that this complex is composed of the ubiquitin conjugating enzyme Ubc13 and the Ubc-like protein Uev1A. We find that TRAF6, a RING domain protein, functions together with Ubc13/Uev1A to catalyze the synthesis of unique polyubiquitin chains linked through lysine-63 (K63) of ubiquitin. Blockade of this polyubiquitin chain synthesis, but not inhibition of the proteasome, prevents the activation of IKK by TRAF6. These results unveil a new regulatory function for ubiquitin, in which IKK is activated through the assembly of K63-linked polyubiquitin chains.
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                Author and article information

                Journal
                Journal ID (nlm-journal-id): 100941354
                Journal ID (pubmed-jr-id): 21750
                Journal ID (nlm-ta): Nat Immunol
                Journal ID (iso-abbrev): Nat. Immunol.
                Title: Nature immunology
                ISSN (Print): 1529-2908
                ISSN (Electronic): 1529-2916
                Publication date Nihms-submitted: 23 August 2012
                Publication date (Electronic): 07 October 2012
                Publication date (Print): November 2012
                Publication date PMC-release: 01 May 2013
                Volume: 13
                Issue: 11
                Pages: 1110-1117
                Affiliations
                Department of Immunology and Center for Inflammation and Cancer, the University of Texas MD Anderson Cancer Center, Houston, Texas, 77054
                Author notes
                [* ]Correspondence should be addressed to C. D. cdong@ 123456mdanderson.org
                Article
                Manuscript ID: NIHMS402538
                DOI: 10.1038/ni.2427
                PMC ID: 3477275
                PubMed ID: 23042150
                SO-VID: a161b35c-8dc1-4502-ae1c-0be448fb4694
                License:

                Users may view, print, copy, download and text and data- mine the content in such documents, for the purposes of academic research, subject always to the full Conditions of use: http://www.nature.com/authors/editorial_policies/license.html#terms

                History
                Funding
                Funded by: National Institute of Allergy and Infectious Diseases Extramural Activities : NIAID
                Award ID: U19 AI071130 || AI
                Funded by: National Institute of Arthritis and Musculoskeletal and Skin Diseases : NIAMS
                Award ID: R01 AR050772 || AR
                Funded by: National Institute of Allergy and Infectious Diseases Extramural Activities : NIAID
                Award ID: R01 AI050761 || AI
                Categories
                Subject: Article

                ScienceOpen disciplines: Immunology
                Data availability:
                ScienceOpen disciplines: Immunology

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