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Xie Z, Wu Y, Shen Y, Guo J, Yuan P, Ma Q, Wang S, Jie Z, Zhou H, Fan S, Chen S. USP7 Inhibits Osteoclastogenesis via Dual Effects of Attenuating TRAF6/TAK1 Axis and Stimulating STING Signaling. Aging Dis 2023; 14:2267-2283. [PMID: 37199589 PMCID: PMC10676781 DOI: 10.14336/ad.2023.0325-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Accepted: 03/25/2023] [Indexed: 05/19/2023] Open
Abstract
Ubiquitination is a reversible post-translational modification implicated in cell differentiation, homeostasis, and organ development. Several deubiquitinases (DUBs) decrease protein ubiquitination through the hydrolysis of ubiquitin linkages. However, the role of DUBs in bone resorption and formation is still unclear. In this study, we identified DUB ubiquitin-specific protease 7 (USP7) as a negative regulator of osteoclast formation. USP7 combines with tumor necrosis factor receptor-associated factor 6 (TRAF6) and inhibits its ubiquitination by impairing the Lys63-linked polyubiquitin chain. Such impairment leads to the suppression of receptor activator of NF-κB ligand (RANKL)-mediated nuclear factor-κB (NF-κB) and mitogen-activated protein kinases (MAPKs) activation without affecting TRAF6 stability. USP7 also protects the stimulator of interferon genes (STING) against degradation, inducing interferon-β (IFN-β) expression in osteoclast formation, thereby inhibiting osteoclastogenesis cooperatively with the classical TRAF6 pathway. Furthermore, USP7 inhibition accelerates osteoclast differentiation and bone resorption both in vitro and in vivo. Contrarily, USP7 overexpression impairs osteoclast differentiation and bone resorption in vitro and in vivo. Additionally, in ovariectomy (OVX) mice, USP7 levels are lower than those in sham-operated mice, suggesting that USP7 plays a role in osteoporosis. Altogether, our data reveal the dual effect of USP7-mediated TRAF6 signal transduction and USP7-mediated protein degradation of STING in osteoclast formation.
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Affiliation(s)
- Ziang Xie
- Department of Orthopedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China.
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China.
| | - Yizheng Wu
- Department of Orthopedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China.
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China.
| | - Yang Shen
- Department of Orthopedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China.
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China.
| | - Jiandong Guo
- Department of Orthopedic Surgery, Ninth people’s Hospital of Hangzhou, Hangzhou, China.
| | - Putao Yuan
- Department of Orthopedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China.
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China.
| | - Qingliang Ma
- Department of Orthopedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China.
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China.
| | - Shiyu Wang
- Department of Orthopedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China.
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China.
| | - Zhiwei Jie
- Department of Orthopedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China.
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China.
| | - Hongyi Zhou
- Department of Orthopedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China.
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China.
| | - Shunwu Fan
- Department of Orthopedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China.
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China.
| | - Shuai Chen
- Department of Orthopedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China.
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China.
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Ma Q, Ruan H, Dai H, Yao WD. USP48/USP31 Is a Nuclear Deubiquitinase that Potently Regulates Synapse Remodeling. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.09.19.558317. [PMID: 37781625 PMCID: PMC10541093 DOI: 10.1101/2023.09.19.558317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/03/2023]
Abstract
Deubiquitinases present locally at synapses regulate synaptic development, function, and plasticity. It remains largely unknown, however, whether deubiquitinases localized outside of the synapse control synapse remodeling. Here we identify ubiquitin specific protease 48 (USP48; formerly USP31) as a nuclear deubiquitinase mediating robust synapse removal. USP48 is expressed primarily during the first postnatal week in the rodent brain and is virtually restricted to nuclei, mediated by a conserved, 13-amino acid nuclear localization signal. When exogenously expressed, USP48, in a deubiquitinase and nuclear localization-dependent manner, induces striking filopodia elaboration, marked spine loss, and significantly reduced synaptic protein clustering in vitro, and erases ~70% of functional synapses in vivo. USP48 interacts with the transcription factor NF-κB, deubiquitinates NF-κB subunit p65 and promotes its stability and activation, and up-regulates NF-κB target genes known to inhibit synaptogenesis. Depleting NF-κB prevents USP48-dependent spine pruning. These findings identify a novel nucleus-enriched deubiquitinase that plays critical roles in synapse remodeling.
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Affiliation(s)
- Qi Ma
- Departments of Psychiatry and Neuroscience, State University of New York, Upstate Medical University, Syracuse, NY 13210
| | - Hongyu Ruan
- Departments of Psychiatry and Neuroscience, State University of New York, Upstate Medical University, Syracuse, NY 13210
| | - Huihui Dai
- Departments of Psychiatry and Neuroscience, State University of New York, Upstate Medical University, Syracuse, NY 13210
| | - Wei-Dong Yao
- Departments of Psychiatry and Neuroscience, State University of New York, Upstate Medical University, Syracuse, NY 13210
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Yuan Y, Shi Z, Wang Q, Guo M, Yuan L, Zhao Z, Liu S, Wu C, Sun R, Wang B, Ouyang G, Ji W. Molecular characterization and expression analyses of five genes involved in the MyD88-dependent pathway of yellow catfish (Pelteobagrus fulvidraco) responding to challenge of Aeromonas hydrophila. FISH & SHELLFISH IMMUNOLOGY 2023; 137:108712. [PMID: 37030559 DOI: 10.1016/j.fsi.2023.108712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 03/23/2023] [Accepted: 03/25/2023] [Indexed: 05/07/2023]
Abstract
MyD88-dependent pathway mediated by Toll-like receptor is one of the vital ways activating immune responses. In order to identify the role of MyD88-dependent signaling pathway in yellow catfish, the Pf_MyD88, Pf_IRAK4, Pf_IRAK1, Pf_TRAF6 and Pf_NFκB1 (p105) (Pf: abbreviation of Pelteobagrus fulvidraco) were cloned and characterized respectively. The Pf_MyD88, Pf_IRAK4, Pf_IRAK1 and Pf_TRAF6 were all highly conserved among species and showed the highest homology to that of Pangasianodon hypophthalmus. Pf_NFκB1 showed the highest homology to that of Ictalurus punetaus. All of the five genes showed similar expression patterns in various tissues, with the highest expression level in the liver. These genes also showed similar expression levels in different embryonic development stages, except Pf_IRAK4. The higher expression level was detected from fertilized eggs to 1 day post hatching (dph), lower expression from 3 dph to 30 dph. After stimulation of inactivated Aeromonas hydrophila, the mRNA expressions of Pf_MyD88, Pf_IRAK4, Pf_IRAK1, Pf_TRAF6 and Pf_NFκB1 were significantly increased at 24 h in the liver, spleen, head kidney and trunk kidney, suggesting that all the five genes were involved in the innate immune response of yellow catfish. These results showed that MyD88-dependent signaling pathway plays important roles for disease defensing in the innate immune response. Meanwhile, inactivated A. hydrophila can cause strong innate immune response, which provides theoretical bases for the application of inactivated vaccines in defense against bacterial diseases of teleost.
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Affiliation(s)
- Yujie Yuan
- Department of Aquatic Animal Medicines, College of Fisheries, Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture and Rural Affair/Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China
| | - Zechao Shi
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan, 430223, China
| | - Qin Wang
- Department of Aquatic Animal Medicines, College of Fisheries, Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture and Rural Affair/Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China
| | - Mengge Guo
- Department of Aquatic Animal Medicines, College of Fisheries, Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture and Rural Affair/Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China
| | - Le Yuan
- Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
| | - Zhangchun Zhao
- Department of Aquatic Animal Medicines, College of Fisheries, Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture and Rural Affair/Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China
| | - Sixue Liu
- Department of Aquatic Animal Medicines, College of Fisheries, Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture and Rural Affair/Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China
| | - Chen Wu
- Department of Aquatic Animal Medicines, College of Fisheries, Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture and Rural Affair/Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China
| | - Ruhan Sun
- Department of Aquatic Animal Medicines, College of Fisheries, Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture and Rural Affair/Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China
| | - Bingchao Wang
- Department of Aquatic Animal Medicines, College of Fisheries, Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture and Rural Affair/Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China
| | - Gang Ouyang
- Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China.
| | - Wei Ji
- Department of Aquatic Animal Medicines, College of Fisheries, Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture and Rural Affair/Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China.
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Semmler S, Gagné M, Garg P, Pickles SR, Baudouin C, Hamon-Keromen E, Destroismaisons L, Khalfallah Y, Chaineau M, Caron E, Bayne AN, Trempe JF, Cashman NR, Star AT, Haqqani AS, Durcan TM, Meiering EM, Robertson J, Grandvaux N, Plotkin SS, McBride HM, Vande Velde C. TNF receptor-associated factor 6 interacts with ALS-linked misfolded superoxide dismutase 1 and promotes aggregation. J Biol Chem 2020; 295:3808-3825. [PMID: 32029478 DOI: 10.1074/jbc.ra119.011215] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Revised: 01/17/2020] [Indexed: 12/12/2022] Open
Abstract
Amyotrophic lateral sclerosis (ALS) is a fatal disease, characterized by the selective loss of motor neurons leading to paralysis. Mutations in the gene encoding superoxide dismutase 1 (SOD1) are the second most common cause of familial ALS, and considerable evidence suggests that these mutations result in an increase in toxicity due to protein misfolding. We previously demonstrated in the SOD1G93A rat model that misfolded SOD1 exists as distinct conformers and forms deposits on mitochondrial subpopulations. Here, using SOD1G93A rats and conformation-restricted antibodies specific for misfolded SOD1 (B8H10 and AMF7-63), we identified the interactomes of the mitochondrial pools of misfolded SOD1. This strategy identified binding proteins that uniquely interacted with either AMF7-63 or B8H10-reactive SOD1 conformers as well as a high proportion of interactors common to both conformers. Of this latter set, we identified the E3 ubiquitin ligase TNF receptor-associated factor 6 (TRAF6) as a SOD1 interactor, and we determined that exposure of the SOD1 functional loops facilitates this interaction. Of note, this conformational change was not universally fulfilled by all SOD1 variants and differentiated TRAF6 interacting from TRAF6 noninteracting SOD1 variants. Functionally, TRAF6 stimulated polyubiquitination and aggregation of the interacting SOD1 variants. TRAF6 E3 ubiquitin ligase activity was required for the former but was dispensable for the latter, indicating that TRAF6-mediated polyubiquitination and aggregation of the SOD1 variants are independent events. We propose that the interaction between misfolded SOD1 and TRAF6 may be relevant to the etiology of ALS.
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Affiliation(s)
- Sabrina Semmler
- Department of Neurology and Neurosurgery, McGill University, Montréal, Quebec H3A 2B4, Canada.,Centre de Recherche du Centre Hospitalier de Université de Montréal, Montréal, Quebec H2X 0A9, Canada
| | - Myriam Gagné
- Centre de Recherche du Centre Hospitalier de Université de Montréal, Montréal, Quebec H2X 0A9, Canada.,Department of Biochemistry and Molecular Medicine, Université de Montréal, Montréal, Quebec H3T 1J4, Canada
| | - Pranav Garg
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Sarah R Pickles
- Centre de Recherche du Centre Hospitalier de Université de Montréal, Montréal, Quebec H2X 0A9, Canada.,Department of Biochemistry and Molecular Medicine, Université de Montréal, Montréal, Quebec H3T 1J4, Canada
| | - Charlotte Baudouin
- Centre de Recherche du Centre Hospitalier de Université de Montréal, Montréal, Quebec H2X 0A9, Canada.,Université Catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
| | - Emeline Hamon-Keromen
- Centre de Recherche du Centre Hospitalier de Université de Montréal, Montréal, Quebec H2X 0A9, Canada.,Université Pierre et Marie Curie, 75005 Paris, France
| | - Laurie Destroismaisons
- Centre de Recherche du Centre Hospitalier de Université de Montréal, Montréal, Quebec H2X 0A9, Canada
| | - Yousra Khalfallah
- Centre de Recherche du Centre Hospitalier de Université de Montréal, Montréal, Quebec H2X 0A9, Canada.,Department of Neurosciences, Université de Montréal, Montréal, Quebec H3T 1J4, Canada
| | - Mathilde Chaineau
- Department of Neurology and Neurosurgery, McGill University, Montréal, Quebec H3A 2B4, Canada.,Montreal Neurological Institute, McGill University, Montréal, Quebec H3A 2B4, Canada
| | - Elise Caron
- Centre de Recherche du Centre Hospitalier de Université de Montréal, Montréal, Quebec H2X 0A9, Canada
| | - Andrew N Bayne
- Department of Pharmacology and Therapeutics, McGill University, Montréal, Quebec H3A 2B4, Canada
| | - Jean-François Trempe
- Department of Pharmacology and Therapeutics, McGill University, Montréal, Quebec H3A 2B4, Canada
| | - Neil R Cashman
- Department of Medicine (Neurology), University of British Columbia and Vancouver Coastal Health Research Institute, Brain Research Centre, Vancouver, British Columbia V6T 2B5, Canada
| | - Alexandra T Star
- Human Health Therapeutics Portfolio, National Research Council of Canada, Ottawa, Ontario, K1A 0R6, Canada
| | - Arsalan S Haqqani
- Human Health Therapeutics Portfolio, National Research Council of Canada, Ottawa, Ontario, K1A 0R6, Canada
| | - Thomas M Durcan
- Department of Neurology and Neurosurgery, McGill University, Montréal, Quebec H3A 2B4, Canada.,Montreal Neurological Institute, McGill University, Montréal, Quebec H3A 2B4, Canada
| | - Elizabeth M Meiering
- Department of Chemistry, Guelph-Waterloo Centre for Graduate Work in Chemistry and Biochemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Janice Robertson
- Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Toronto, Ontario M5T 0S8, Canada
| | - Nathalie Grandvaux
- Centre de Recherche du Centre Hospitalier de Université de Montréal, Montréal, Quebec H2X 0A9, Canada.,Department of Biochemistry and Molecular Medicine, Université de Montréal, Montréal, Quebec H3T 1J4, Canada
| | - Steven S Plotkin
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Heidi M McBride
- Department of Neurology and Neurosurgery, McGill University, Montréal, Quebec H3A 2B4, Canada.,Montreal Neurological Institute, McGill University, Montréal, Quebec H3A 2B4, Canada
| | - Christine Vande Velde
- Centre de Recherche du Centre Hospitalier de Université de Montréal, Montréal, Quebec H2X 0A9, Canada .,Department of Biochemistry and Molecular Medicine, Université de Montréal, Montréal, Quebec H3T 1J4, Canada.,Department of Neurosciences, Université de Montréal, Montréal, Quebec H3T 1J4, Canada
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The ubiquitin-editing enzyme A20 regulates synapse remodeling and efficacy. Brain Res 2020; 1727:146569. [PMID: 31783001 PMCID: PMC9255268 DOI: 10.1016/j.brainres.2019.146569] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 11/19/2019] [Accepted: 11/23/2019] [Indexed: 12/31/2022]
Abstract
Ubiquitination and its reverse process, deubiquitination, play essential roles in neural development, function, and plasticity. A20, a ubiquitin editing enzyme that can remove K63-polyubiquitin chains from substrates and attach K48-polyubiquitin chains to them, is a critical component in the NF-κB signaling pathway in the immune system. This dual ubiquitin enzyme is also present in mammalian brains, but its potential role in neurons and synapses is unknown. We show that A20 in pyramidal neurons potently regulates dendritic arborization, spine morphogenesis, and synaptic transmission through an NF-κB-dependent mechanism. In cultured hippocampal neurons, overexpression of A20 reduced dendritic complexity and spine size and density, whereas A20 knockdown increased spine size and density, as well as clustering of the postsynaptic scaffold PSD-95 and glutamate receptor subunit GluA1. A20 effects in vitro were recapitulated in vivo where increasing or decreasing A20 expression in mouse brains reduced and enhanced spine density, respectively. Functionally, A20 knockdown significantly increased the amplitude, but not frequency of miniature excitatory postsynaptic currents, suggesting a role in postsynaptic efficacy. A20 negatively regulated NF-κB activation in neurons and A20 mutants deficient in either the deubiquitinase or the ubiquitin ligase activity failed to suppress NF-κB activation or reduce spine morphogenesis. Finally, selective inhibition of NF-κB abolished A20 knockdown-elicited spine formation, suggesting that A20 exerts its modulation on synapses through NF-κB signaling. Together, our study reveals a previously unknown role for A20, the only known ubiquitin editing enzyme with both deubiquitinase and ubiquitin ligase activity, in dendritic arborization, spine remodeling, and synaptic plasticity.
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Zhu G, Cheng Z, Huang Y, Zheng W, Yang S, Lin C, Ye J. TRAF6 promotes the progression and growth of colorectal cancer through nuclear shuttle regulation NF-kB/c-jun signaling pathway. Life Sci 2019; 235:116831. [PMID: 31487530 DOI: 10.1016/j.lfs.2019.116831] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 08/19/2019] [Accepted: 09/01/2019] [Indexed: 01/21/2023]
Abstract
AIMS TRAF6 is an intracellular signal adapter molecule plays a significant role in tumor development. However, the specific mechanism causes and promotes of colorectal cancer keep largely unknown. Therefore, we sought to investigate the roles and the molecular mechanisms of TRAF6 in regulation colorectal cancer. MATERIAL AND METHODS The immunohistochemistry analyzed the expression of TRAF6 in colorectal cancer samples and analyzed the effects of expression of TRAF6 on the prognosis in colorectal cancer. The roles of TRAF6 in regulating colorectal cancer cell proliferation, colony formation, cell migration, cell wound healing and cell invasion were evaluated in vitro. Animal studies were performed to investigate the effects of TRAF6 on tumor growth. mRNA abundance of key genes was analyzed via qPCR. Protein level of TRAF6 and NF-κB/AP-1 signaling pathways was examined by Western blot. Luciferase reporter and Immunofluorescence assays were used to identify the activities NF-κB/AP-1 signaling pathways. KEY FINDINGS TRAF6 high expression in colorectal cancer tissues. And colorectal cancer patients with high expression of TRAF6 had a poor survival rate. TRAF6 knockdown can inhibit proliferation, migration, and invasion of colorectal cancer cells in vitro and in vivo experiments. TRAF6 activates the TRAF6-NF-κB/AP-1 signaling pathway by entering the nucleus, causing biobehavioral changes in colorectal cancer cells. SIGNIFICANCE TRAF6 plays a vital role in the progression of colorectal cancer. What's more, research elucidating the biological mechanisms of TRAF6 can treated as potential therapeutic target for colorectal cancer.
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Affiliation(s)
- Guangwei Zhu
- Department of Gastrointestinal Surgery 2 Section, The First Hospital Affiliated to Fujian Medical University, Fuzhou 350005, China; Key Laboratory of Ministry of Education for Gastrointestinal Cancer, Fujian Medical University, Fuzhou 350000, China
| | - Zhibin Cheng
- Department of Gastrointestinal Surgery 2 Section, The First Hospital Affiliated to Fujian Medical University, Fuzhou 350005, China; Key Laboratory of Ministry of Education for Gastrointestinal Cancer, Fujian Medical University, Fuzhou 350000, China
| | - Yongjian Huang
- Department of Gastrointestinal Surgery 2 Section, The First Hospital Affiliated to Fujian Medical University, Fuzhou 350005, China
| | - Wei Zheng
- Department of Gastrointestinal Surgery 2 Section, The First Hospital Affiliated to Fujian Medical University, Fuzhou 350005, China
| | - Shugang Yang
- Department of Gastrointestinal Surgery 2 Section, The First Hospital Affiliated to Fujian Medical University, Fuzhou 350005, China
| | - Chunlin Lin
- Department of Gastrointestinal Surgery 2 Section, The First Hospital Affiliated to Fujian Medical University, Fuzhou 350005, China
| | - Jianxin Ye
- Department of Gastrointestinal Surgery 2 Section, The First Hospital Affiliated to Fujian Medical University, Fuzhou 350005, China; Key Laboratory of Ministry of Education for Gastrointestinal Cancer, Fujian Medical University, Fuzhou 350000, China
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7
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TARBP2 inhibits IRF7 activation by suppressing TRAF6-mediated K63-linked ubiquitination of IRF7. Mol Immunol 2019; 109:116-125. [DOI: 10.1016/j.molimm.2019.02.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Revised: 01/18/2019] [Accepted: 02/24/2019] [Indexed: 02/07/2023]
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8
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Wang Z, Huang Y, Li Y, Wang B, Lu Y, Xia L, Tang J, Jian J. Biological characterization, expression, and functional analysis of tumor necrosis factor receptor-associated factor 6 in Nile tilapia (Oreochromis niloticus). FISH & SHELLFISH IMMUNOLOGY 2018; 80:497-504. [PMID: 29933111 DOI: 10.1016/j.fsi.2018.06.036] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Revised: 06/13/2018] [Accepted: 06/18/2018] [Indexed: 06/08/2023]
Abstract
Nile tilapia (Oreochromis niloticus) is a pivotal economic fish that has been plagued by Streptococcus agalactiae infections for many years. Tumor necrosis factor receptor-associated factor 6 (TRAF6) is a crucial adaptor molecule of the interleukin-1 receptor/Toll-like receptor (IL-1/TLR) superfamily, which can trigger downstream signaling cascades involved in innate immunity. In this study, the full-length cDNA of TRAF6 was cloned from O. niloticus (named On-TRAF6), which has an open reading frame of 1716 bp, and encode a polypeptide of 571 amino acids. The predicted amino acid sequence of On-TRAF6 contained the characteristic motifs of TRAF proteins, including a Zinc finger of RING-type, two Zinc fingers of TRAF-type, and a MATH (meprin and TRAF homology) domain. Multiple sequence alignment revealed that On-TRAF6 shares a relatively high level of identity with those of other fishes (64-98%). In healthy tilapia, mRNA expression of On-TRAF6 could be detected in all the examined tissues and the highest expression occurred in the spleen. Moreover, we found that On-TRAF6 was involved immune response of Nile tilapia following the stimulation with Streptococcus agalactiae and polyinosinic: polycytidylic acid (Poly I:C) when determined by using qPCR. The result of subcellular localization showed that On-TRAF6 distributed in the cytoplasm, and over-expression of On-TRAF6 could strongly activated NF-кB pathway in HEK293T cells. These findings indicated that On-TRAF6 may play an important role in the immune response to intracellular bacteria in Nile tilapia.
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Affiliation(s)
- Zhiwen Wang
- College of Fishery, Guangdong Ocean University, Zhanjiang, 524025, China; Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals, Zhanjiang, 524025, China; Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Institutes, Zhanjiang, 524025, China
| | - Yu Huang
- College of Fishery, Guangdong Ocean University, Zhanjiang, 524025, China; Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals, Zhanjiang, 524025, China; Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Institutes, Zhanjiang, 524025, China
| | - Yuan Li
- College of Fishery, Guangdong Ocean University, Zhanjiang, 524025, China; Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals, Zhanjiang, 524025, China; Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Institutes, Zhanjiang, 524025, China
| | - Bei Wang
- College of Fishery, Guangdong Ocean University, Zhanjiang, 524025, China; Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals, Zhanjiang, 524025, China; Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Institutes, Zhanjiang, 524025, China
| | - Yishan Lu
- College of Fishery, Guangdong Ocean University, Zhanjiang, 524025, China; Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals, Zhanjiang, 524025, China; Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Institutes, Zhanjiang, 524025, China.
| | - Liqun Xia
- College of Fishery, Guangdong Ocean University, Zhanjiang, 524025, China; Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals, Zhanjiang, 524025, China; Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Institutes, Zhanjiang, 524025, China
| | - Jufen Tang
- College of Fishery, Guangdong Ocean University, Zhanjiang, 524025, China; Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals, Zhanjiang, 524025, China; Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Institutes, Zhanjiang, 524025, China
| | - JiChang Jian
- College of Fishery, Guangdong Ocean University, Zhanjiang, 524025, China; Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals, Zhanjiang, 524025, China; Key Laboratory of Control for Disease of Aquatic Animals of Guangdong Higher Education Institutes, Zhanjiang, 524025, China
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9
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Hu L, Xu J, Xie X, Zhou Y, Tao P, Li H, Han X, Wang C, Liu J, Xu P, Neculai D, Xia Z. Oligomerization-primed coiled-coil domain interaction with Ubc13 confers processivity to TRAF6 ubiquitin ligase activity. Nat Commun 2017; 8:814. [PMID: 28993672 PMCID: PMC5634496 DOI: 10.1038/s41467-017-01290-0] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2017] [Accepted: 09/06/2017] [Indexed: 11/30/2022] Open
Abstract
Ubiquitin ligase TRAF6, together with ubiquitin-conjugating enzyme Ubc13/Uev1, catalyzes processive assembly of unanchored K63-linked polyubiquitin chains for TAK1 activation in the IL-1R/TLR pathways. However, what domain and how it functions to enable TRAF6’s processivity are largely uncharacterized. Here, we find TRAF6 coiled-coil (CC) domain is crucial to enable its processivity. The CC domain mediates TRAF6 oligomerization to ensure efficient long polyubiquitin chain assembly. Mutating or deleting the CC domain impairs TRAF6 oligomerization and processive polyubiquitin chain assembly. Fusion of the CC domain to the E3 ubiquitin ligase CHIP/STUB1 renders the latter capable of NF-κB activation. Moreover, the CC domain, after oligomerization, interacts with Ubc13/Ub~Ubc13, which further contributes to TRAF6 processivity. Point mutations within the CC domain that weaken TRAF6 interaction with Ubc13/Ub~Ubc13 diminish TRAF6 processivity. Our results reveal that the CC oligomerization primes its interaction with Ubc13/Ub~Ubc13 to confer processivity to TRAF6 ubiquitin ligase activity. Ubiquitin ligase TRAF6 catalyzes assembly of free polyubiquitin chains for TAK1 activation in the IL-1R/TLR pathways, but the mechanism underlying its processivity is unclear. Here, the authors show that TRAF6 coiled-coil oligomerization domain primes its interaction with Ubc13/Ub~Ubc13 to confer processivity.
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Affiliation(s)
- Lin Hu
- Life Sciences Institute and Innovation Center for Cell Signaling Network, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Jiafeng Xu
- Life Sciences Institute and Innovation Center for Cell Signaling Network, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Xiaomei Xie
- Life Sciences Institute and Innovation Center for Cell Signaling Network, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Yiwen Zhou
- Life Sciences Institute and Innovation Center for Cell Signaling Network, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Panfeng Tao
- Life Sciences Institute and Innovation Center for Cell Signaling Network, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Haidong Li
- Life Sciences Institute and Innovation Center for Cell Signaling Network, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Xu Han
- Life Sciences Institute and Innovation Center for Cell Signaling Network, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Chong Wang
- Life Sciences Institute and Innovation Center for Cell Signaling Network, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Jian Liu
- Department of Surgical Oncology, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Pinglong Xu
- Life Sciences Institute and Innovation Center for Cell Signaling Network, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Dante Neculai
- College of Medicine, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Zongping Xia
- Life Sciences Institute and Innovation Center for Cell Signaling Network, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
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10
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Wu H, Hao A, Cui H, Wu W, Yang H, Hu B, Li P. TRAF6 expression is associated with poorer prognosis and high recurrence in urothelial bladder cancer. Oncol Lett 2017; 14:2432-2438. [PMID: 28781679 DOI: 10.3892/ol.2017.6427] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2015] [Accepted: 04/13/2017] [Indexed: 01/03/2023] Open
Abstract
The aim of the present study was to investigate the clinical significance of TNF receptor-associated factor 6 (TRAF6) expression in urothelial bladder cancer. TRAF6 expression was detected by immunohistochemistry in 126 samples of patients with urothelial bladder cancer. The association between clinicopathological factors and TRAF6 expression was analyzed by χ2 test. The association between TRAF6 expression, overall survival rate and the recurrence-free survival rate was evaluated in univariate analysis with Kaplan-Meier test and in multivariate analysis with Cox-regression model. In the cohort tested, the rate of high TRAF6 expression was 61.9% (78/126). TRAF6 expression was demonstrated to be significantly associated with positive metastasis (P=0.001) with χ2 test. Furthermore, TRAF6 expression was demonstrated to be associated with overall survival rate (P=0.016) and recurrence-free survival rate (P=0.016). With Cox-regression model, it was indicate that TRAF6 high expression was an independent predictive factor of poor prognosis (P=0.037) and high recurrence (P=0.011). High TRAF6 expression may predict unfavorable prognosis and high recurrence in urothelial bladder cancer, indicating that TRAF6 may be a potential and promising therapeutic target in urothelial bladder cancer.
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Affiliation(s)
- Hanli Wu
- Department of Nephrology, Yidu Central Hospital of Weifang, Weifang, Shandong 262500, P.R. China
| | - Aixia Hao
- Department of Nephrology, Yidu Central Hospital of Weifang, Weifang, Shandong 262500, P.R. China
| | - Honghong Cui
- Department of Nephrology, Yidu Central Hospital of Weifang, Weifang, Shandong 262500, P.R. China
| | - Wenbin Wu
- Department of Nephrology, Yidu Central Hospital of Weifang, Weifang, Shandong 262500, P.R. China
| | - Huanrong Yang
- Department of Nephrology, Yidu Central Hospital of Weifang, Weifang, Shandong 262500, P.R. China
| | - Baohong Hu
- East District of Shandong Provincial Hospital of Shandong Univeristy, Jinan, Shandong 250014, P.R. China.,Department of Medical Oncology, Yantai Yuhuangding Hospital Affiliated to Qingdao University, Yantai, Shandong 264000, P.R. China
| | - Peng Li
- Department of Medical Oncology, Yantai Yuhuangding Hospital Affiliated to Qingdao University, Yantai, Shandong 264000, P.R. China
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11
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Schimmack G, Schorpp K, Kutzner K, Gehring T, Brenke JK, Hadian K, Krappmann D. YOD1/TRAF6 association balances p62-dependent IL-1 signaling to NF-κB. eLife 2017; 6. [PMID: 28244869 PMCID: PMC5340530 DOI: 10.7554/elife.22416] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2016] [Accepted: 02/26/2017] [Indexed: 12/25/2022] Open
Abstract
The ubiquitin ligase TRAF6 is a key regulator of canonical IκB kinase (IKK)/NF-κB signaling in response to interleukin-1 (IL-1) stimulation. Here, we identified the deubiquitinating enzyme YOD1 (OTUD2) as a novel interactor of TRAF6 in human cells. YOD1 binds to the C-terminal TRAF homology domain of TRAF6 that also serves as the interaction surface for the adaptor p62/Sequestosome-1, which is required for IL-1 signaling to NF-κB. We show that YOD1 competes with p62 for TRAF6 association and abolishes the sequestration of TRAF6 to cytosolic p62 aggregates by a non-catalytic mechanism. YOD1 associates with TRAF6 in unstimulated cells but is released upon IL-1β stimulation, thereby facilitating TRAF6 auto-ubiquitination as well as NEMO/IKKγ substrate ubiquitination. Further, IL-1 triggered IKK/NF-κB signaling and induction of target genes is decreased by YOD1 overexpression and augmented after YOD1 depletion. Hence, our data define that YOD1 antagonizes TRAF6/p62-dependent IL-1 signaling to NF-κB. DOI:http://dx.doi.org/10.7554/eLife.22416.001
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Affiliation(s)
- Gisela Schimmack
- Research Unit Cellular Signal Integration, Institute of Molecular Toxicology and Pharmacology, Helmholtz Zentrum München - German Research Center for Environmental Health, Neuherberg, Germany
| | - Kenji Schorpp
- Assay Development and Screening Platform, Institute of Molecular Toxicology and Pharmacology, Helmholtz Zentrum München - German Research Center for Environmental Health, Neuherberg, Germany
| | - Kerstin Kutzner
- Research Unit Cellular Signal Integration, Institute of Molecular Toxicology and Pharmacology, Helmholtz Zentrum München - German Research Center for Environmental Health, Neuherberg, Germany
| | - Torben Gehring
- Research Unit Cellular Signal Integration, Institute of Molecular Toxicology and Pharmacology, Helmholtz Zentrum München - German Research Center for Environmental Health, Neuherberg, Germany
| | - Jara Kerstin Brenke
- Assay Development and Screening Platform, Institute of Molecular Toxicology and Pharmacology, Helmholtz Zentrum München - German Research Center for Environmental Health, Neuherberg, Germany
| | - Kamyar Hadian
- Assay Development and Screening Platform, Institute of Molecular Toxicology and Pharmacology, Helmholtz Zentrum München - German Research Center for Environmental Health, Neuherberg, Germany
| | - Daniel Krappmann
- Research Unit Cellular Signal Integration, Institute of Molecular Toxicology and Pharmacology, Helmholtz Zentrum München - German Research Center for Environmental Health, Neuherberg, Germany
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12
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Ginster S, Bardet M, Unterreiner A, Malinverni C, Renner F, Lam S, Freuler F, Gerrits B, Voshol J, Calzascia T, Régnier CH, Renatus M, Nikolay R, Israël L, Bornancin F. Two Antagonistic MALT1 Auto-Cleavage Mechanisms Reveal a Role for TRAF6 to Unleash MALT1 Activation. PLoS One 2017; 12:e0169026. [PMID: 28052131 PMCID: PMC5214165 DOI: 10.1371/journal.pone.0169026] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Accepted: 12/09/2016] [Indexed: 11/18/2022] Open
Abstract
The paracaspase MALT1 has arginine-directed proteolytic activity triggered by engagement of immune receptors. Recruitment of MALT1 into activation complexes is required for MALT1 proteolytic function. Here, co-expression of MALT1 in HEK293 cells, either with activated CARD11 and BCL10 or with TRAF6, was used to explore the mechanism of MALT1 activation at the molecular level. This work identified a prominent self-cleavage site of MALT1 isoform A (MALT1A) at R781 (R770 in MALT1B) and revealed that TRAF6 can activate MALT1 independently of the CBM. Intramolecular cleavage at R781/R770 removes a C-terminal TRAF6-binding site in both MALT1 isoforms, leaving MALT1B devoid of the two key interaction sites with TRAF6. A previously identified auto-proteolysis site of MALT1 at R149 leads to deletion of the death-domain, thereby abolishing interaction with BCL10. By using MALT1 isoforms and cleaved fragments thereof, as well as TRAF6 WT and mutant forms, this work shows that TRAF6 induces N-terminal auto-proteolytic cleavage of MALT1 at R149 and accelerates MALT1 protein turnover. The MALT1 fragment generated by N-terminal self-cleavage at R149 was labile and displayed enhanced signaling properties that required an intact K644 residue, previously shown to be a site for mono-ubiquitination of MALT1. Conversely, C-terminal self-cleavage at R781/R770 hampered the ability for self-cleavage at R149 and stabilized MALT1 by hindering interaction with TRAF6. C-terminal self-cleavage had limited impact on MALT1A but severely reduced MALT1B proteolytic and signaling functions. It also abrogated NF-κB activation by N-terminally cleaved MALT1A. Altogether, this study provides further insights into mechanisms that regulate the scaffolding and activation cycle of MALT1. It also emphasizes the reduced functional capacity of MALT1B as compared to MALT1A.
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Affiliation(s)
- Stefanie Ginster
- Novartis Institutes for BioMedical Research, Novartis Campus, Basel, Switzerland
| | - Maureen Bardet
- Novartis Institutes for BioMedical Research, Novartis Campus, Basel, Switzerland
| | - Adeline Unterreiner
- Novartis Institutes for BioMedical Research, Novartis Campus, Basel, Switzerland
| | - Claire Malinverni
- Novartis Institutes for BioMedical Research, Novartis Campus, Basel, Switzerland
| | - Florian Renner
- Novartis Institutes for BioMedical Research, Novartis Campus, Basel, Switzerland
| | - Stephen Lam
- Novartis Institutes for BioMedical Research, Novartis Campus, Basel, Switzerland
| | - Felix Freuler
- Novartis Institutes for BioMedical Research, Novartis Campus, Basel, Switzerland
| | - Bertran Gerrits
- Novartis Institutes for BioMedical Research, Novartis Campus, Basel, Switzerland
| | - Johannes Voshol
- Novartis Institutes for BioMedical Research, Novartis Campus, Basel, Switzerland
| | - Thomas Calzascia
- Novartis Institutes for BioMedical Research, Novartis Campus, Basel, Switzerland
| | - Catherine H. Régnier
- Novartis Institutes for BioMedical Research, Novartis Campus, Basel, Switzerland
| | - Martin Renatus
- Novartis Institutes for BioMedical Research, Novartis Campus, Basel, Switzerland
| | - Rainer Nikolay
- Novartis Institutes for BioMedical Research, Novartis Campus, Basel, Switzerland
| | - Laura Israël
- Novartis Institutes for BioMedical Research, Novartis Campus, Basel, Switzerland
| | - Frédéric Bornancin
- Novartis Institutes for BioMedical Research, Novartis Campus, Basel, Switzerland
- * E-mail:
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13
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Bid Promotes K63-Linked Polyubiquitination of Tumor Necrosis Factor Receptor Associated Factor 6 (TRAF6) and Sensitizes to Mutant SOD1-Induced Proinflammatory Signaling in Microglia. eNeuro 2016; 3:eN-NWR-0099-15. [PMID: 27257617 PMCID: PMC4870272 DOI: 10.1523/eneuro.0099-15.2016] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Revised: 04/07/2016] [Accepted: 04/11/2016] [Indexed: 12/13/2022] Open
Abstract
Mutations in the superoxide dismutase 1 (SOD1) gene contribute to motoneuron degeneration and are evident in 20% of familial amyotrophic lateral sclerosis cases. Mutant SOD1 induces microglial activation through a stimulation of Toll-like receptors 2 and 4 (TLR2 and TLR4). Mutations in the superoxide dismutase 1 (SOD1) gene contribute to motoneuron degeneration and are evident in 20% of familial amyotrophic lateral sclerosis cases. Mutant SOD1 induces microglial activation through a stimulation of Toll-like receptors 2 and 4 (TLR2 and TLR4). In the present study, we identified the proapoptotic Bcl-2 family protein Bid as a positive regulator of mutant SOD1-induced TLR-nuclear factor-κB (NF-κB) signaling in microglia. bid-deficient primary mouse microglia showed reduced NF-κB signaling in response to TLR4 activation or exposure to conditioned medium derived from SOD1G93A expressing NSC-34 cells. Attenuation of NF-κB signaling in bid-deficient microglia was associated with lower levels of phosphorylated IKKα/β and p65, with a delayed degradation of IκBα and enhanced degradation of Peli1. Upstream of IKK, we found that Bid interacted with, and promoted, the K63-linked polyubiquitination of the E3 ubiquitin ligase tumor necrosis factor receptor associated factor 6 (TRAF6) in microglia. Our study suggests a key role for Bid in the regulation of TLR4-NF-κB proinflammatory signaling during mutant SOD1-induced disease pathology. Bid promotes TLR4-NF-κB signaling by interacting with TRAF6 and promoting TRAF6 K63-linked polyubiquitination in microglia.
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14
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Zhai Y, Luo F, Chen Y, Zhou S, Li Z, Liu M, Bi D, Jin H. Molecular characterization and functional analysis of duck TRAF6. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2015; 49:1-6. [PMID: 25445905 DOI: 10.1016/j.dci.2014.11.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Revised: 11/06/2014] [Accepted: 11/06/2014] [Indexed: 06/04/2023]
Abstract
Tumor necrosis factor receptor-associated factor 6 (TRAF6) plays a pivotal role in activating various signaling cascades as an intracellular signal transducer. Although significant progress has been made clarifying TRAF6 function in mammals, the role of TRAF6 in ducks (duTRAF6) remains poorly understood. In the present study, we cloned the full-length duTRAF6 cDNA from duck embryo fibroblasts (DEFs) for the first time. Real-time quantitative reverse transcription-polymerase chain reaction assays showed that duTRAF6 was widely expressed in different tissues. Overexpression of duTRAF6 activated nuclear factor kappa B (NF-κB) and induced interferon-β expression. Furthermore, a deletion mutant analysis revealed that the duTRAF6 region between aa 115 and 375 was essential for activating NF-κB. In addition, duTRAF6 knockdown by RNA interference significantly reduced poly(I:C)- and Sendai virus-induced NF-κB activation in DEFs. Taken together, our results demonstrate that duTRAF6 plays a crucial immunoregulatory role in the duck innate immune response.
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Affiliation(s)
- Yajun Zhai
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
| | - Fen Luo
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
| | - Yushan Chen
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
| | - Shanshan Zhou
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
| | - Zili Li
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
| | - Mei Liu
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
| | - Dingren Bi
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
| | - Hui Jin
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China.
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15
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Feng H, Lopez GY, Kim CK, Alvarez A, Duncan CG, Nishikawa R, Nagane M, Su AJA, Auron PE, Hedberg ML, Wang L, Raizer JJ, Kessler JA, Parsa AT, Gao WQ, Kim SH, Minata M, Nakano I, Grandis JR, McLendon RE, Bigner DD, Lin HK, Furnari FB, Cavenee WK, Hu B, Yan H, Cheng SY. EGFR phosphorylation of DCBLD2 recruits TRAF6 and stimulates AKT-promoted tumorigenesis. J Clin Invest 2014; 124:3741-56. [PMID: 25061874 DOI: 10.1172/jci73093] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Accepted: 06/06/2014] [Indexed: 12/31/2022] Open
Abstract
Aberrant activation of EGFR in human cancers promotes tumorigenesis through stimulation of AKT signaling. Here, we determined that the discoidina neuropilin-like membrane protein DCBLD2 is upregulated in clinical specimens of glioblastomas and head and neck cancers (HNCs) and is required for EGFR-stimulated tumorigenesis. In multiple cancer cell lines, EGFR activated phosphorylation of tyrosine 750 (Y750) of DCBLD2, which is located within a recently identified binding motif for TNF receptor-associated factor 6 (TRAF6). Consequently, phosphorylation of DCBLD2 Y750 recruited TRAF6, leading to increased TRAF6 E3 ubiquitin ligase activity and subsequent activation of AKT, thereby enhancing EGFR-driven tumorigenesis. Moreover, evaluation of patient samples of gliomas and HNCs revealed an association among EGFR activation, DCBLD2 phosphorylation, and poor prognoses. Together, our findings uncover a pathway in which DCBLD2 functions as a signal relay for oncogenic EGFR signaling to promote tumorigenesis and suggest DCBLD2 and TRAF6 as potential therapeutic targets for human cancers that are associated with EGFR activation.
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16
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Opaluch AM, Schneider M, Chiang CY, Nguyen QT, Maestre AM, Mulder LCF, Secundino I, De Jesus PD, König R, Simon V, Nizet V, MacLeod G, Varmuza S, Fernandez-Sesma A, Chanda SK. Positive regulation of TRAF6-dependent innate immune responses by protein phosphatase PP1-γ. PLoS One 2014; 9:e89284. [PMID: 24586659 PMCID: PMC3930702 DOI: 10.1371/journal.pone.0089284] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Accepted: 01/20/2014] [Indexed: 12/24/2022] Open
Abstract
Innate immune sensors such as Toll-like receptors (TLRs) differentially utilize adaptor proteins and additional molecular mediators to ensure robust and precise immune responses to pathogen challenge. Through a gain-of-function genetic screen, we identified the gamma catalytic subunit of protein phosphatase 1 (PP1-γ) as a positive regulator of MyD88-dependent proinflammatory innate immune activation. PP1-γ physically interacts with the E3 ubiquitin ligase TRAF6, and enhances the activity of TRAF6 towards itself and substrates such as IKKγ, whereas enzymatically inactive PP1-γ represses these events. Importantly, these activities were found to be critical for cellular innate responses to pathogen challenge and microbial clearance in both mouse macrophages and human monocyte lines. These data indicate that PP1-γ phosphatase activity regulates overall TRAF6 E3 ubiquitin ligase function and promotes NF-κB-mediated innate signaling responses.
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Affiliation(s)
- Amanda M. Opaluch
- Infectious and Inflammatory Disease Center, Sanford-Burnham Medical Research Institute, La Jolla, California, United States of America
| | - Monika Schneider
- Infectious and Inflammatory Disease Center, Sanford-Burnham Medical Research Institute, La Jolla, California, United States of America
| | - Chih-yuan Chiang
- Infectious and Inflammatory Disease Center, Sanford-Burnham Medical Research Institute, La Jolla, California, United States of America
| | - Quy T. Nguyen
- Infectious and Inflammatory Disease Center, Sanford-Burnham Medical Research Institute, La Jolla, California, United States of America
| | - Ana M. Maestre
- Department of Microbiology and The Global Health and Emerging Pathogens Institute, Mount Sinai School of Medicine, New York, New York, United States of America
| | - Lubbertus C. F. Mulder
- Department of Microbiology and The Global Health and Emerging Pathogens Institute, Mount Sinai School of Medicine, New York, New York, United States of America
| | - Ismael Secundino
- Department of Pediatrics, University of California San Diego, La Jolla, California, United States of America
| | - Paul D. De Jesus
- Infectious and Inflammatory Disease Center, Sanford-Burnham Medical Research Institute, La Jolla, California, United States of America
| | - Renate König
- Infectious and Inflammatory Disease Center, Sanford-Burnham Medical Research Institute, La Jolla, California, United States of America
- Paul-Ehrlich-Institut, Federal Institute for Vaccines and Biomedicines, Research Group “Host-Pathogen Interactions”, Langen, Germany
| | - Viviana Simon
- Department of Microbiology and The Global Health and Emerging Pathogens Institute, Mount Sinai School of Medicine, New York, New York, United States of America
| | - Victor Nizet
- Department of Pediatrics, University of California San Diego, La Jolla, California, United States of America
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California, United States of America
| | - Graham MacLeod
- Department of Cell and Systems Biology, University of Toronto, Toronto, Ontario, Canada
| | - Susannah Varmuza
- Department of Cell and Systems Biology, University of Toronto, Toronto, Ontario, Canada
| | - Ana Fernandez-Sesma
- Department of Microbiology and The Global Health and Emerging Pathogens Institute, Mount Sinai School of Medicine, New York, New York, United States of America
| | - Sumit K. Chanda
- Infectious and Inflammatory Disease Center, Sanford-Burnham Medical Research Institute, La Jolla, California, United States of America
- * E-mail:
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17
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Intermolecular binding between TIFA-FHA and TIFA-pT mediates tumor necrosis factor alpha stimulation and NF-κB activation. Mol Cell Biol 2012; 32:2664-73. [PMID: 22566686 DOI: 10.1128/mcb.00438-12] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The forkhead-associated (FHA) domain recognizes phosphothreonine (pT) with high specificity and functional diversity. TIFA (TRAF-interacting protein with an FHA domain) is the smallest FHA-containing human protein. Its overexpression was previously suggested to provoke NF-κB activation, yet its exact roles in this signaling pathway and the underlying molecular mechanism remain unclear. Here we identify a novel threonine phosphorylation site on TIFA and show that this phosphorylated threonine (pT) binds with the FHA domain of TIFA, leading to TIFA oligomerization and TIFA-mediated NF-κB activation. Detailed analysis indicated that unphosphorylated TIFA exists as an intrinsic dimer and that the FHA-pT9 binding occurs between different dimers of TIFA. In addition, silencing of endogenous TIFA resulted in attenuation of tumor necrosis factor alpha (TNF-α)-mediated downstream signaling. We therefore propose that the TIFA FHA-pT9 binding provides a previously unidentified link between TNF-α stimulation and NF-κB activation. The intermolecular FHA-pT9 binding between dimers also represents a new mechanism for the FHA domain.
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18
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Liu A, Gong P, Hyun SW, Wang KZQ, Cates EA, Perkins D, Bannerman DD, Puché AC, Toshchakov VY, Fang S, Auron PE, Vogel SN, Goldblum SE. TRAF6 protein couples Toll-like receptor 4 signaling to Src family kinase activation and opening of paracellular pathway in human lung microvascular endothelia. J Biol Chem 2012; 287:16132-45. [PMID: 22447928 DOI: 10.1074/jbc.m111.310102] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Gram-negative bacteria release lipopolysaccharide (LPS) into the bloodstream. Here, it engages Toll-like receptor (TLR) 4 expressed in human lung microvascular endothelia (HMVEC-Ls) to open the paracellular pathway through Src family kinase (SFK) activation. The signaling molecules that couple TLR4 to the SFK-driven barrier disruption are unknown. In HMVEC-Ls, siRNA-induced silencing of TIRAP/Mal and overexpression of dominant-negative TIRAP/Mal each blocked LPS-induced SFK activation and increases in transendothelial [(14)C]albumin flux, implicating the MyD88-dependent pathway. LPS increased TRAF6 autoubiquitination and binding to IRAK1. Silencing of TRAF6, TRAF6-dominant-negative overexpression, or preincubation of HMVEC-Ls with a cell-permeable TRAF6 decoy peptide decreased both LPS-induced SFK activation and barrier disruption. LPS increased binding of both c-Src and Fyn to GST-TRAF6 but not to a GST-TRAF6 mutant in which the three prolines in the putative Src homology 3 domain-binding motif (amino acids 461-469) were substituted with alanines. A cell-permeable decoy peptide corresponding to the same proline-rich motif reduced SFK binding to WT GST-TRAF6 compared with the Pro → Ala-substituted peptide. Finally, LPS increased binding of activated Tyr(P)(416)-SFK to GST-TRAF6, and preincubation of HMVEC-Ls with SFK-selective tyrosine kinase inhibitors, PP2 and SU6656, diminished TRAF6 binding to c-Src and Fyn. During the TRAF6-SFK association, TRAF6 catalyzed Lys(63)-linked ubiquitination of c-Src and Fyn, whereas SFK activation increased tyrosine phosphorylation of TRAF6. The TRAF6 decoy peptide blocked both LPS-induced SFK ubiquitination and TRAF6 phosphorylation. Together, these data indicate that the proline-rich Src homology 3 domain-binding motif in TRAF6 interacts directly with activated SFKs to couple LPS engagement of TLR4 to SFK activation and loss of barrier integrity in HMVEC-Ls.
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Affiliation(s)
- Anguo Liu
- Mucosal Biology Research Center, University of Maryland, Baltimore, Maryland 21201, USA
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Zhao W, Wang L, Zhang M, Yuan C, Gao C. E3 Ubiquitin Ligase Tripartite Motif 38 Negatively Regulates TLR-Mediated Immune Responses by Proteasomal Degradation of TNF Receptor-Associated Factor 6 in Macrophages. THE JOURNAL OF IMMUNOLOGY 2012; 188:2567-74. [DOI: 10.4049/jimmunol.1103255] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Mutational analysis of TRAF6 reveals a conserved functional role of the RING dimerization interface and a potentially necessary but insufficient role of RING-dependent TRAF6 polyubiquitination towards NF-κB activation. Cell Signal 2010; 23:772-7. [PMID: 21185369 DOI: 10.1016/j.cellsig.2010.12.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2010] [Revised: 12/01/2010] [Accepted: 12/16/2010] [Indexed: 11/23/2022]
Abstract
TRAF6 is an E3 ubiquitin ligase that plays a pivotal role in the activation of NF-κB by innate and adaptive immunity stimuli. TRAF6 consists of a highly conserved carboxyl terminal TRAF-C domain which is preceded by a coiled coil domain and an amino terminal region that contains a RING domain and a series of putative zinc-finger motifs. The TRAF-C domain contributes to TRAF6 oligomerization and mediates the interaction of TRAF6 with upstream signaling molecules whereas the RING domain comprises the core of the ubiquitin ligase catalytic domain. In order to identify structural elements that are important for TRAF6-induced NF-κB activation, mutational analysis of the TRAF-C and RING domains was performed. Alterations of highly conserved residues of the TRAF-C domain of TRAF6 did not affect significantly the ability of the protein to activate NF-κB. On the other hand a number of functionally important residues (L77, Q82, R88, F118, N121 and E126) for the activation of NF-κB were identified within the RING domain of TRAF6. Interestingly, several homologues of these residues in TRAF2 were shown to have a conserved functional role in TRAF2-induced NF-κB activation and lie at the dimerization interface of the RING domain. Finally, whereas alteration of Q82, R88 and F118 compromised both the K63-linked polyubiquitination of TRAF6 and its ability to activate NF-κB, alteration of L77, N121 and E126 diminished the NF-κB activating function of TRAF6 without affecting TRAF6 K63-linked polyubiquitination. Our results support a conserved functional role of the TRAF RING domain dimerization interface and a potentially necessary but insufficient role for RING-dependent TRAF6 K63-linked polyubiquitination towards NF-κB activation in cells.
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