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Wrobel L, Hoffmann JL, Li X, Rubinsztein DC. p37 regulates VCP/p97 shuttling and functions in the nucleus and cytosol. SCIENCE ADVANCES 2024; 10:eadl6082. [PMID: 38701207 PMCID: PMC11068011 DOI: 10.1126/sciadv.adl6082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Accepted: 04/02/2024] [Indexed: 05/05/2024]
Abstract
The AAA+-ATPase valosin-containing protein (VCP; also called p97 or Cdc48), a major protein unfolding machinery with a variety of essential functions, localizes to different subcellular compartments where it has different functions. However, the processes regulating the distribution of VCP between the cytosol and nucleus are not understood. Here, we identified p37 (also called UBXN2B) as a major factor regulating VCP nucleocytoplasmic shuttling. p37-dependent VCP localization was crucial for local cytosolic VCP functions, such as autophagy, and nuclear functions in DNA damage repair. Mutations in VCP causing multisystem proteinopathy enhanced its association with p37, leading to decreased nuclear localization of VCP, which enhanced susceptibility to DNA damage accumulation. Both VCP localization and DNA damage susceptibility in cells with such mutations were normalized by lowering p37 levels. Thus, we uncovered a mechanism by which VCP nucleocytoplasmic distribution is fine-tuned, providing a means for VCP to respond appropriately to local needs.
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Affiliation(s)
- Lidia Wrobel
- Department of Medical Genetics, Cambridge Institute for Medical Research, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge CB2 0XY, UK
- UK Dementia Research Institute, University of Cambridge, Cambridge Institute for Medical Research, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge CB2 0XY, UK
| | - Johanna L. Hoffmann
- Department of Medical Genetics, Cambridge Institute for Medical Research, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge CB2 0XY, UK
- UK Dementia Research Institute, University of Cambridge, Cambridge Institute for Medical Research, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge CB2 0XY, UK
| | - Xinyi Li
- Department of Medical Genetics, Cambridge Institute for Medical Research, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge CB2 0XY, UK
- UK Dementia Research Institute, University of Cambridge, Cambridge Institute for Medical Research, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge CB2 0XY, UK
| | - David C. Rubinsztein
- Department of Medical Genetics, Cambridge Institute for Medical Research, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge CB2 0XY, UK
- UK Dementia Research Institute, University of Cambridge, Cambridge Institute for Medical Research, The Keith Peters Building, Cambridge Biomedical Campus, Hills Road, Cambridge CB2 0XY, UK
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Shi X, Xie X, Guo Y, Zhang J, Gong Z, Zhang K, Mei J, Xia X, Xia H, Ning N, Xiao Y, Yang Q, Wang GL, Liu W. A fungal core effector exploits the OsPUX8B.2-OsCDC48-6 module to suppress plant immunity. Nat Commun 2024; 15:2559. [PMID: 38519521 PMCID: PMC10959940 DOI: 10.1038/s41467-024-46903-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Accepted: 03/12/2024] [Indexed: 03/25/2024] Open
Abstract
Proteins containing a ubiquitin regulatory X (UBX) domain are cofactors of Cell Division Cycle 48 (CDC48) and function in protein quality control. However, whether and how UBX-containing proteins participate in host-microbe interactions remain unclear. Here we show that MoNLE1, an effector from the fungal pathogen Magnaporthe oryzae, is a core virulence factor that suppresses rice immunity by specifically interfering with OsPUX8B.2. The UBX domain of OsPUX8B.2 is required for its binding to OsATG8 and OsCDC48-6 and controls its 26 S proteasome-dependent stability. OsPUX8B.2 and OsCDC48-6 positively regulate plant immunity against blast fungus, while the high-temperature tolerance heat-shock protein OsBHT, a putative cytoplasmic substrate of OsPUX8B.2-OsCDC48-6, negatively regulates defense against blast infection. MoNLE1 promotes the nuclear migration and degradation of OsPUX8B.2 and disturbs its association with OsBHT. Given the high conservation of MoNLE1 among fungal isolates, plants with broad and durable blast resistance might be generated by engineering intracellular proteins resistant to MoNLE1.
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Affiliation(s)
- Xuetao Shi
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
- Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Key Laboratory of Gene Editing Technologies (Hainan), Ministry of Agriculture and Rural Affairs, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518000, China
| | - Xin Xie
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Yuanwen Guo
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Junqi Zhang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Ziwen Gong
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
- Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Key Laboratory of Gene Editing Technologies (Hainan), Ministry of Agriculture and Rural Affairs, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518000, China
| | - Kai Zhang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Jie Mei
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
- Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Key Laboratory of Gene Editing Technologies (Hainan), Ministry of Agriculture and Rural Affairs, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518000, China
| | - Xinyao Xia
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Haoxue Xia
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Na Ning
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Yutao Xiao
- Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Key Laboratory of Gene Editing Technologies (Hainan), Ministry of Agriculture and Rural Affairs, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518000, China
| | - Qing Yang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Guo-Liang Wang
- Department of Plant Pathology, The Ohio State University, Columbus, OH, 43210, USA
| | - Wende Liu
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China.
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3
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Hao M, Lu P, Sotropa S, Manupati K, Yeo SK, Guan JL. In vivo CRISPR knockout screen identifies p47 as a suppressor of HER2+ breast cancer metastasis by regulating NEMO trafficking and autophagy flux. Cell Rep 2024; 43:113780. [PMID: 38363674 DOI: 10.1016/j.celrep.2024.113780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 12/14/2023] [Accepted: 01/26/2024] [Indexed: 02/18/2024] Open
Abstract
Autophagy is a conserved cellular process, and its dysfunction is implicated in cancer and other diseases. Here, we employ an in vivo CRISPR screen targeting genes implicated in the regulation of autophagy to identify the Nsfl1c gene encoding p47 as a suppressor of human epidermal growth factor receptor 2 (HER2)+ breast cancer metastasis. p47 ablation specifically increases metastasis without promoting primary mammary tumor growth. Analysis of human breast cancer patient databases and tissue samples indicates a correlation of lower p47 expression levels with metastasis and decreased survival. Mechanistic studies show that p47 functions in the repair of lysosomal damage for autophagy flux and in the endosomal trafficking of nuclear factor κB essential modulator for lysosomal degradation to promote metastasis. Our results demonstrate a role and mechanisms of p47 in the regulation of breast cancer metastasis. They highlight the potential to exploit p47 as a suppressor of metastasis through multiple pathways in HER2+ breast cancer cells.
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Affiliation(s)
- Mingang Hao
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
| | - Peixin Lu
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
| | - Sarah Sotropa
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
| | - Kanakaraju Manupati
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
| | - Syn Kok Yeo
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA
| | - Jun-Lin Guan
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA.
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Dutta S, Ganguly A, Ghosh Roy S. An Overview of the Unfolded Protein Response (UPR) and Autophagy Pathways in Human Viral Oncogenesis. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2024; 386:81-131. [PMID: 38782502 DOI: 10.1016/bs.ircmb.2024.01.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2024]
Abstract
Autophagy and Unfolded Protein Response (UPR) can be regarded as the safe keepers of cells exposed to intense stress. Autophagy maintains cellular homeostasis, ensuring the removal of foreign particles and misfolded macromolecules from the cytoplasm and facilitating the return of the building blocks into the system. On the other hand, UPR serves as a shock response to prolonged stress, especially Endoplasmic Reticulum Stress (ERS), which also includes the accumulation of misfolded proteins in the ER. Since one of the many effects of viral infection on the host cell machinery is the hijacking of the host translational system, which leaves in its wake a plethora of misfolded proteins in the ER, it is perhaps not surprising that UPR and autophagy are common occurrences in infected cells, tissues, and patient samples. In this book chapter, we try to emphasize how UPR, and autophagy are significant in infections caused by six major oncolytic viruses-Epstein-Barr (EBV), Human Papilloma Virus (HPV), Human Immunodeficiency Virus (HIV), Human Herpesvirus-8 (HHV-8), Human T-cell Lymphotropic Virus (HTLV-1), and Hepatitis B Virus (HBV). Here, we document how whole-virus infection or overexpression of individual viral proteins in vitro and in vivo models can regulate the different branches of UPR and the various stages of macro autophagy. As is true with other viral infections, the relationship is complicated because the same virus (or the viral protein) exerts different effects on UPR and Autophagy. The nature of this response is determined by the cell types, or in some cases, the presence of diverse extracellular stimuli. The vice versa is equally valid, i.e., UPR and autophagy exhibit both anti-tumor and pro-tumor properties based on the cell type and other factors like concentrations of different metabolites. Thus, we have tried to coherently summarize the existing knowledge, the crux of which can hopefully be harnessed to design vaccines and therapies targeted at viral carcinogenesis.
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Affiliation(s)
- Shovan Dutta
- Center for Immunotherapy & Precision Immuno-Oncology (CITI), Lerner Research Institute, Cleveland Clinic, Cleveland, OH, United States
| | - Anirban Ganguly
- Department of Biochemistry, All India Institute of Medical Sciences, Deoghar, Jharkhand, India
| | - Sounak Ghosh Roy
- Henry M Jackson for the Advancement of Military Medicine, Naval Medical Research Command, Silver Spring, MD, United States.
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Chen SL, Li CM, Li W, Liu QS, Hu SY, Zhao MY, Hu DS, Hao YW, Zeng JH, Zhang Y. How autophagy, a potential therapeutic target, regulates intestinal inflammation. Front Immunol 2023; 14:1087677. [PMID: 37168865 PMCID: PMC10165000 DOI: 10.3389/fimmu.2023.1087677] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Accepted: 04/03/2023] [Indexed: 05/13/2023] Open
Abstract
Inflammatory bowel disease (IBD) is a group of disorders that cause chronic inflammation in the intestines, with the primary types including ulcerative colitis and Crohn's disease. The link between autophagy, a catabolic mechanism in which cells clear protein aggregates and damaged organelles, and intestinal health has been widely studied. Experimental animal studies and human clinical studies have revealed that autophagy is pivotal for intestinal homeostasis maintenance, gut ecology regulation and other aspects. However, few articles have summarized and discussed the pathways by which autophagy improves or exacerbates IBD. Here, we review how autophagy alleviates IBD through the specific genes (e.g., ATG16L1, IRGM, NOD2 and LRRK2), crosstalk of multiple phenotypes with autophagy (e.g., Interaction of autophagy with endoplasmic reticulum stress, intestinal antimicrobial defense and apoptosis) and autophagy-associated signaling pathways. Moreover, we briefly discuss the role of autophagy in colorectal cancer and current status of autophagy-based drug research for IBD. It should be emphasized that autophagy has cell-specific and environment-specific effects on the gut. One of the problems of IBD research is to understand how autophagy plays a role in intestinal tract under specific environmental factors. A better understanding of the mechanism of autophagy in the occurrence and progression of IBD will provide references for the development of therapeutic drugs and disease management for IBD in the future.
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Affiliation(s)
- Shuang-Lan Chen
- Department of Gastroenterology, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Chun-Meng Li
- Department of Gastroenterology, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Wei Li
- Department of Gastroenterology, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Qing-Song Liu
- Department of Gastroenterology, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Shuang-Yuan Hu
- Department of Gastroenterology, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Mao-Yuan Zhao
- Department of Gastroenterology, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Dong-Sen Hu
- Department of Reproductive Medicine, Chengdu Xinan Women’s Hospital, Chengdu, China
| | - Yan-Wei Hao
- Department of Gastroenterology, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Jin-Hao Zeng
- Department of Gastroenterology, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China
- TCM Regulating Metabolic Diseases Key Laboratory of Sichuan Province, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China
- *Correspondence: Jin-Hao Zeng, ; Yi Zhang,
| | - Yi Zhang
- Department of Gastroenterology, Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, China
- *Correspondence: Jin-Hao Zeng, ; Yi Zhang,
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Zhou Z, Zhou J, Liao J, Chen Z, Zheng Y. The Emerging Role of Astrocytic Autophagy in Central Nervous System Disorders. Neurochem Res 2022; 47:3697-3708. [PMID: 35960484 DOI: 10.1007/s11064-022-03714-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Revised: 07/15/2022] [Accepted: 07/29/2022] [Indexed: 10/15/2022]
Abstract
Astrocytes act as "housekeeping cells" for maintaining cerebral homeostasis and play an important role in many disorders. Recent studies further highlight the contribution of autophagy to astrocytic functions, including astrogenesis, the astrocytic removal of neurotoxins or stressors, and astrocytic polarization. More importantly, genetic and pharmacological approaches have provided evidence that outlines the contributions of astrocytic autophagy to several brain disorders, including neurodegeneration, cerebral ischemia, and depression. In this study, we summarize the emerging role of autophagy in regulating astrocytic functions and discuss the contributions of astrocytic autophagy to different CNS disorders.
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Affiliation(s)
- Zhuchen Zhou
- Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province, School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China
| | - Jing Zhou
- Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province, School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China
| | - Jie Liao
- Pharmaceutical Informatics Institute, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang, China
| | - Zhong Chen
- Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province, School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China
| | - Yanrong Zheng
- Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province, School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China.
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7
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Abstract
The p97 AAA+ATPase is an essential and abundant regulator of protein homeostasis that plays a central role in unfolding ubiquitylated substrates. Here we report two cryo-EM structures of human p97 in complex with its p47 adaptor. One of the conformations is six-fold symmetric, corresponds to previously reported structures of p97, and lacks bound substrate. The other structure adopts a helical conformation, displays substrate running in an extended conformation through the pore of the p97 hexamer, and resembles structures reported for other AAA unfoldases. These findings support the model that p97 utilizes a "hand-over-hand" mechanism in which two residues of the substrate are translocated for hydrolysis of two ATPs, one in each of the two p97 AAA ATPase rings. Proteomics analysis supports the model that one p97 complex can bind multiple substrate adaptors or binding partners, and can process substrates with multiple types of ubiquitin modification.
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Ferrari V, Cristofani R, Tedesco B, Crippa V, Chierichetti M, Casarotto E, Cozzi M, Mina F, Piccolella M, Galbiati M, Rusmini P, Poletti A. Valosin Containing Protein (VCP): A Multistep Regulator of Autophagy. Int J Mol Sci 2022; 23:1939. [PMID: 35216053 PMCID: PMC8878954 DOI: 10.3390/ijms23041939] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 02/03/2022] [Accepted: 02/06/2022] [Indexed: 02/04/2023] Open
Abstract
Valosin containing protein (VCP) has emerged as a central protein in the regulation of the protein quality control (PQC) system. VCP mutations are causative of multisystem proteinopathies, which include neurodegenerative diseases (NDs), and share various signs of altered proteostasis, mainly associated with autophagy malfunctioning. Autophagy is a complex multistep degradative system essential for the maintenance of cell viability, especially in post-mitotic cells as neurons and differentiated skeletal muscle cells. Interestingly, many studies concerning NDs have focused on autophagy impairment as a pathological mechanism or autophagy activity boosting to rescue the pathological phenotype. The role of VCP in autophagy has been widely debated, but recent findings have defined new mechanisms associated with VCP activity in the regulation of autophagy, showing that VCP is involved in different steps of this pathway. Here we will discuss the multiple activity of VCP in the autophagic pathway underlying its leading role either in physiological or pathological conditions. A better understanding of VCP complexes and mechanisms in regulating autophagy could define the altered mechanisms by which VCP directly or indirectly causes or modulates different human diseases and revealing possible new therapeutic approaches for NDs.
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Affiliation(s)
- Veronica Ferrari
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Via Balzaretti 9, 20133 Milan, Italy; (V.F.); (R.C.); (V.C.); (M.C.); (E.C.); (M.C.); (F.M.); (M.P.); (M.G.); (P.R.)
| | - Riccardo Cristofani
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Via Balzaretti 9, 20133 Milan, Italy; (V.F.); (R.C.); (V.C.); (M.C.); (E.C.); (M.C.); (F.M.); (M.P.); (M.G.); (P.R.)
| | - Barbara Tedesco
- Unit of Medical Genetics and Neurogenetics, Fondazione IRCCS—Istituto Neurologico Carlo Besta, Via Celoria 11, 20133 Milan, Italy;
| | - Valeria Crippa
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Via Balzaretti 9, 20133 Milan, Italy; (V.F.); (R.C.); (V.C.); (M.C.); (E.C.); (M.C.); (F.M.); (M.P.); (M.G.); (P.R.)
| | - Marta Chierichetti
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Via Balzaretti 9, 20133 Milan, Italy; (V.F.); (R.C.); (V.C.); (M.C.); (E.C.); (M.C.); (F.M.); (M.P.); (M.G.); (P.R.)
| | - Elena Casarotto
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Via Balzaretti 9, 20133 Milan, Italy; (V.F.); (R.C.); (V.C.); (M.C.); (E.C.); (M.C.); (F.M.); (M.P.); (M.G.); (P.R.)
| | - Marta Cozzi
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Via Balzaretti 9, 20133 Milan, Italy; (V.F.); (R.C.); (V.C.); (M.C.); (E.C.); (M.C.); (F.M.); (M.P.); (M.G.); (P.R.)
| | - Francesco Mina
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Via Balzaretti 9, 20133 Milan, Italy; (V.F.); (R.C.); (V.C.); (M.C.); (E.C.); (M.C.); (F.M.); (M.P.); (M.G.); (P.R.)
| | - Margherita Piccolella
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Via Balzaretti 9, 20133 Milan, Italy; (V.F.); (R.C.); (V.C.); (M.C.); (E.C.); (M.C.); (F.M.); (M.P.); (M.G.); (P.R.)
| | - Mariarita Galbiati
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Via Balzaretti 9, 20133 Milan, Italy; (V.F.); (R.C.); (V.C.); (M.C.); (E.C.); (M.C.); (F.M.); (M.P.); (M.G.); (P.R.)
| | - Paola Rusmini
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Via Balzaretti 9, 20133 Milan, Italy; (V.F.); (R.C.); (V.C.); (M.C.); (E.C.); (M.C.); (F.M.); (M.P.); (M.G.); (P.R.)
| | - Angelo Poletti
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Via Balzaretti 9, 20133 Milan, Italy; (V.F.); (R.C.); (V.C.); (M.C.); (E.C.); (M.C.); (F.M.); (M.P.); (M.G.); (P.R.)
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Antitumor effects of chloroquine/hydroxychloroquine mediated by inhibition of the NF-κB signaling pathway through abrogation of autophagic p47 degradation in adult T-cell leukemia/lymphoma cells. PLoS One 2021; 16:e0256320. [PMID: 34407152 PMCID: PMC8372904 DOI: 10.1371/journal.pone.0256320] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Accepted: 08/03/2021] [Indexed: 01/18/2023] Open
Abstract
Adult T-cell leukemia/lymphoma (ATLL) originates from human T-cell leukemia virus type 1 (HTLV-1) infection due to the activation of the nuclear factor-κB (NF-κB) signaling pathway to maintain proliferation and survival. An important mechanism of the activated NF-κB signaling pathway in ATLL is the activation of the macroautophagy (herafter referred to as autophagy in the remainder of this manuscript)-lysosomal degradation of p47 (NSFL1C), a negative regulator of the NF-κB pathway. Therefore, we considered the use of chloroquine (CQ) or hydroxychloroquine (HCQ) (CQ/HCQ) as an autophagy inhibitor to treat ATLL; these drugs were originally approved by the FDA as antimalarial drugs and have recently been used to treat autoimmune diseases, such as systemic lupus erythematosus (SLE). In this paper, we determined the therapeutic efficacy of CQ/HCQ, as NF-κB inhibitors, in ATLL mediated by blockade of p47 degradation. Administration of CQ/HCQ to ATLL cell lines and primary ATLL cells induced cell growth inhibition in a dose-dependent manner, and the majority of cells underwent apoptosis after CQ administration. As to the molecular mechanism, autophagy was inhibited in CQ-treated ATLL cells, and activation of the NF-κB pathway was suppressed with the restoration of the p47 level. When the antitumor effect of CQ/HCQ was examined using immunodeficient mice transplanted with ATLL cell lines, CQ/HCQ significantly suppressed tumor growth and improved the survival rate in the ATLL xenograft mouse model. Importantly, HCQ selectively induced ATLL cell death in the ATLL xenograft mouse model at the dose used to treat SLE. Taken together, our results suggest that the inhibition of autophagy by CQ/HCQ may become a novel and effective strategy for the treatment of ATLL.
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10
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Zheng Y, Zhou Z, Han F, Chen Z. Special issue: Neuroinflammatory pathways as treatment targets in brain disorders autophagic regulation of neuroinflammation in ischemic stroke. Neurochem Int 2021; 148:105114. [PMID: 34192589 DOI: 10.1016/j.neuint.2021.105114] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 06/12/2021] [Accepted: 06/22/2021] [Indexed: 01/01/2023]
Abstract
Despite the high lethality and increasing prevalence, effective therapy for ischemic stroke is still limited. As a crucial pathophysiological mechanism underlying ischemic injury, neuroinflammation remains a promising target for novel anti-ischemic strategies. However, the potential adverse effects limit the applications of traditional anti-inflammatory therapies. Recent explorations into the mechanisms of inflammation reveal that autophagy acts as a critical part in inflammation regulation. Autophagy refers to the hierarchically organized process resulting in the lysosomal degradation of intracellular components. Autophagic clearance of intracellular danger signals (DAMPs) suppresses the inflammation activation. Alternatively, autophagy blunts inflammation by removing either inflammasomes or the transcriptional modulators of cytokines. Interestingly, several compounds have been proved to alleviate neuroinflammatory responses and protect against ischemic injury by activating autophagy, highlighting autophagy as a promising target for the regulation of ischemia-induced neuroinflammation. Nonetheless, the molecular mechanism underlying autophagic regulation of neuroinflammation in the central nervous system is less clear and further explorations are still needed.
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Affiliation(s)
- Yanrong Zheng
- Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province, School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou, China
| | - Zhuchen Zhou
- Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province, School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou, China
| | - Feng Han
- Key Lab of Cardiovascular and Cerebrovascular Medicine, Drug Target and Drug Discovery Center, School of Pharmacy, Nanjing Medical University, Nanjing, China
| | - Zhong Chen
- Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province, School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou, China.
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11
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Li Y, Wang X, Qi S, Gao L, Huang G, Ren Z, Li K, Peng Y, Yi G, Guo J, Yang R, Wang H, Zhang X, Liu Y. Spliceosome-regulated RSRP1-dependent NF-κB activation promotes the glioblastoma mesenchymal phenotype. Neuro Oncol 2021; 23:1693-1708. [PMID: 34042961 DOI: 10.1093/neuonc/noab126] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND The glioblastoma (GBM) mesenchymal (MES) phenotype, induced by NF-κB activation, is characterized by aggressive tumour progression and poor clinical outcomes. Our previous analysis indicated that MES GBM has a unique alternative splicing (AS) pattern; however, the underlying mechanism remains obscure. We aimed to reveal how splicing regulation contributes to MES phenotype promotion in GBM. METHODS We screened novel candidate splicing factors that participate in NF-κB activation and MES phenotype promotion in GBM. In vitro and in vivo assays were used to explore the function of RSRP1 in MES GBM. RESULTS Here, we identified that arginine/serine-rich protein 1 (RSRP1) promotes the MES phenotype by facilitating GBM cell invasion and apoptosis resistance. Proteomic, transcriptomic and functional analyses confirmed that RSRP1 regulates AS in MES GBM through mediating spliceosome assembly. One RSRP1-regulated AS event resulted in skipping PARP6 exon 18 to form truncated, oncogenic PARP6-s. This isoform was unable to effectively suppress NF-κB. Co-treatment of cultured GBM cells and GBM tumour-bearing mice with spliceosome and NF-κB inhibitors exerted a synergistic effect on MES GBM growth. CONCLUSION We identified a novel mechanism through which RSRP1-dependent splicing promotes the GBM MES phenotype. Targeting AS via RSRP1-related spliceosomal factors might constitute a promising treatment for GBM.
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Affiliation(s)
- Yaomin Li
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Laboratory for Precision Neurosurgery, Nanfang hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Xiran Wang
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Laboratory for Precision Neurosurgery, Nanfang hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Songtao Qi
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Laboratory for Precision Neurosurgery, Nanfang hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Lei Gao
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Laboratory for Precision Neurosurgery, Nanfang hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Guanglong Huang
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Laboratory for Precision Neurosurgery, Nanfang hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Zhonglu Ren
- College of Medical Information Engineering, Guangdong Pharmaceutical University, Guangzhou, Guangdong, China
| | - Kaishu Li
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Laboratory for Precision Neurosurgery, Nanfang hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Yuping Peng
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Laboratory for Precision Neurosurgery, Nanfang hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Guozhong Yi
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Laboratory for Precision Neurosurgery, Nanfang hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Jinglin Guo
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Laboratory for Precision Neurosurgery, Nanfang hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Runwei Yang
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Laboratory for Precision Neurosurgery, Nanfang hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Hai Wang
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Laboratory for Precision Neurosurgery, Nanfang hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Xian Zhang
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Laboratory for Precision Neurosurgery, Nanfang hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Yawei Liu
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Laboratory for Precision Neurosurgery, Nanfang hospital, Southern Medical University, Guangzhou, Guangdong, China
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12
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Ducasa N, Grasso D, Benencio P, Papademetrio DL, Biglione M, Kashanchi F, Berini C, Garcia MN. Autophagy in Human T-Cell Leukemia Virus Type 1 (HTLV-1) Induced Leukemia. Front Oncol 2021; 11:641269. [PMID: 33869030 PMCID: PMC8045967 DOI: 10.3389/fonc.2021.641269] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 03/10/2021] [Indexed: 12/23/2022] Open
Abstract
Viruses play an important role in the development of certain human cancers. They are estimated to contribute 16% to all human cancers. Human T-cell leukemia virus type 1 (HTLV-1) was the first human retrovirus to be discovered and is the etiological agent of adult T-cell leukemia/lymphoma (ATLL), an aggressive T-cell malignancy with poor prognosis. HTLV-1 viral proteins interact with mechanisms and proteins present in host cells for their own benefit, evading the immune system and promoting the establishment of disease. Several viruses manipulate the autophagy pathway to achieve their infective goals, and HTLV-1 is not the exception. HTLV-1 Tax viral protein engages NF-κB and autophagy pathways prone favoring viral replication and T cell transformation. In this review we focus on describing the relationship of HTLV-1 with the autophagy machinery and its implication in the development of ATLL.
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Affiliation(s)
- Nicolás Ducasa
- Instituto de Investigaciones Biomédicas en Retrovirus y SIDA (INBIRS), CONICET- Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Daniel Grasso
- Cátedra de Fisiopatología, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Estudios de la Inmunidad Humoral (IDEHU), Buenos Aires, Argentina
| | - Paula Benencio
- Instituto de Investigaciones Biomédicas en Retrovirus y SIDA (INBIRS), CONICET- Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Daniela L. Papademetrio
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Estudios de la Inmunidad Humoral (IDEHU), Buenos Aires, Argentina
- Cátedra de Inmunología, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Mirna Biglione
- Instituto de Investigaciones Biomédicas en Retrovirus y SIDA (INBIRS), CONICET- Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Fatah Kashanchi
- Laboratory of Molecular Virology, School of Systems Biology, George Mason University, Manassas, VA, United States
| | - Carolina Berini
- Instituto de Investigaciones Biomédicas en Retrovirus y SIDA (INBIRS), CONICET- Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Maria Noé Garcia
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Estudios de la Inmunidad Humoral (IDEHU), Buenos Aires, Argentina
- Cátedra de Inmunología, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina
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13
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Recchiuti A, Isopi E, Romano M, Mattoscio D. Roles of Specialized Pro-Resolving Lipid Mediators in Autophagy and Inflammation. Int J Mol Sci 2020; 21:E6637. [PMID: 32927853 PMCID: PMC7555248 DOI: 10.3390/ijms21186637] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 09/07/2020] [Accepted: 09/08/2020] [Indexed: 12/12/2022] Open
Abstract
Autophagy is a catabolic pathway that accounts for degradation and recycling of cellular components to extend cell survival under stress conditions. In addition to this prominent role, recent evidence indicates that autophagy is crucially involved in the regulation of the inflammatory response, a tightly controlled process aimed at clearing the inflammatory stimulus and restoring tissue homeostasis. To be efficient and beneficial to the host, inflammation should be controlled by a resolution program, since uncontrolled inflammation is the underlying cause of many pathologies. Resolution of inflammation is an active process mediated by a variety of mediators, including the so-called specialized pro-resolving lipid mediators (SPMs), a family of endogenous lipid autacoids known to regulate leukocyte infiltration and activities, and counterbalance cytokine production. Recently, regulation of autophagic mechanisms by these mediators has emerged, uncovering unappreciated connections between inflammation resolution and autophagy. Here, we summarize mechanisms of autophagy and resolution, focusing on the contribution of autophagy in sustaining paradigmatic examples of chronic inflammatory disorders. Then, we discuss the evidence that SPMs can restore dysregulated autophagy, hypothesizing that resolution of inflammation could represent an innovative approach to modulate autophagy and its impact on the inflammatory response.
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Affiliation(s)
| | | | | | - Domenico Mattoscio
- Center for Advanced Studies and Technology, Department of Medical, Oral and Biotechnology Sciences, University of Chieti—Pescara, 66100 Chieti, Italy; (A.R.); (E.I.); (M.R.)
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14
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Cho KS, Lee JH, Cho J, Cha GH, Song GJ. Autophagy Modulators and Neuroinflammation. Curr Med Chem 2020; 27:955-982. [PMID: 30381067 DOI: 10.2174/0929867325666181031144605] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Revised: 08/20/2018] [Accepted: 10/21/2018] [Indexed: 12/12/2022]
Abstract
BACKGROUND Neuroinflammation plays a critical role in the development and progression of various neurological disorders. Therefore, various studies have focused on the development of neuroinflammation inhibitors as potential therapeutic tools. Recently, the involvement of autophagy in the regulation of neuroinflammation has drawn substantial scientific interest, and a growing number of studies support the role of impaired autophagy in the pathogenesis of common neurodegenerative disorders. OBJECTIVE The purpose of this article is to review recent research on the role of autophagy in controlling neuroinflammation. We focus on studies employing both mammalian cells and animal models to evaluate the ability of different autophagic modulators to regulate neuroinflammation. METHODS We have mostly reviewed recent studies reporting anti-neuroinflammatory properties of autophagy. We also briefly discussed a few studies showing that autophagy modulators activate neuroinflammation in certain conditions. RESULTS Recent studies report neuroprotective as well as anti-neuroinflammatory effects of autophagic modulators. We discuss the possible underlying mechanisms of action of these drugs and their potential limitations as therapeutic agents against neurological disorders. CONCLUSION Autophagy activators are promising compounds for the treatment of neurological disorders involving neuroinflammation.
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Affiliation(s)
- Kyoung Sang Cho
- Department of Biological Sciences, Konkuk University, Seoul, Korea
| | - Jang Ho Lee
- Translational Brain Research Center, International St. Mary's Hospital, Catholic Kwandong University, Incheon, Korea
| | - Jeiwon Cho
- Translational Brain Research Center, International St. Mary's Hospital, Catholic Kwandong University, Incheon, Korea.,Department of Medical Science, College of Medicine, Catholic Kwandong University, Gangneung, Gangwon-do, Korea
| | - Guang-Ho Cha
- Department of Medical Science, College of Medicine, Chungnam National University, 35015 Daejeon, Korea
| | - Gyun Jee Song
- Translational Brain Research Center, International St. Mary's Hospital, Catholic Kwandong University, Incheon, Korea.,Department of Medical Science, College of Medicine, Catholic Kwandong University, Gangneung, Gangwon-do, Korea
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15
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Sui X, Pan M, Li YM. Insights into the Design of p97-targeting Small Molecules from Structural Studies on p97 Functional Mechanism. Curr Med Chem 2020; 27:298-316. [PMID: 31584361 DOI: 10.2174/0929867326666191004162411] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 08/24/2019] [Accepted: 08/27/2019] [Indexed: 12/14/2022]
Abstract
p97, also known as valosin-containing protein or CDC48, is a member of the AAA+ protein family that is highly conserved in eukaryotes. It binds to various cofactors in the body to perform its protein-unfolding function and participates in DNA repair, degradation of subcellular membrane proteins, and protein quality control pathways, among other processes. Its malfunction can lead to many diseases, such as inclusion body myopathy, associated with Paget's disease of bone and/or frontotemporal dementia, amyotrophic lateral sclerosis disease, and others. In recent years, many small-molecule inhibitors have been deployed against p97, including bis (diethyldithiocarbamate)- copper and CB-5083, which entered the first phase of clinical tests but failed. One bottleneck in the design of p97 drugs is that its molecular mechanism remains unclear. This paper summarizes recent studies on the molecular mechanisms of p97, which may lead to insight into how the next generation of small molecules targeting p97 can be designed.
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Affiliation(s)
- Xin Sui
- Department of Chemistry, Tsinghua University, Beijing 100086, China
| | - Man Pan
- Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, Illinois 60637, United States
| | - Yi-Ming Li
- School of Food and Biological Engineering, Hefei University of Technology, Hefei, Anhui 230009, China
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16
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Hong CS, Park MR, Sun EG, Choi W, Hwang JE, Bae WK, Rhee JH, Cho SH, Chung IJ. Gal-3BP Negatively Regulates NF-κB Signaling by Inhibiting the Activation of TAK1. Front Immunol 2019; 10:1760. [PMID: 31402917 PMCID: PMC6677151 DOI: 10.3389/fimmu.2019.01760] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Accepted: 07/11/2019] [Indexed: 01/02/2023] Open
Abstract
Galectin-3-binding protein (Gal-3BP) is a member of the family of scavenger receptor cysteine-rich (SRCR) domain-containing proteins, which are associated with the immune system. However, the functional roles and signaling mechanisms of Gal-3BP in host defense and the immune response remain largely unknown. Here, we identified cellular Gal-3BP as a negative regulator of NF-κB activation and proinflammatory cytokine production in lipopolysaccharide (LPS)-stimulated murine embryonic fibroblasts (MEFs). Furthermore, cellular Gal-3BP interacted with transforming growth factor β-activated kinase 1 (TAK1), a crucial mediator of NF-κB activation in response to cellular stress. Gal-3BP inhibited the phosphorylation of TAK1, leading to suppression of its kinase activity and reduced protein stability. In vivo we found that Lgals3BP deficiency in mice enhanced LPS-induced proinflammatory cytokine release and rendered mice more sensitive to LPS-induced endotoxin shock. Overall, these results suggest that Gal-3BP is a novel suppressor of TAK1-dependent NF-κB activation that may have potential in the prevention and treatment of inflammatory diseases.
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Affiliation(s)
- Chang-Soo Hong
- Department of Internal Medicine, Chonnam National University Medical School, Hwasun, South Korea
| | - Mi-Ra Park
- Department of Internal Medicine, Chonnam National University Medical School, Hwasun, South Korea
| | - Eun-Gene Sun
- Department of Internal Medicine, Chonnam National University Medical School, Hwasun, South Korea
| | - Wonyoung Choi
- Department of Internal Medicine, Chonnam National University Medical School, Hwasun, South Korea
| | - Jun-Eul Hwang
- Department of Internal Medicine, Chonnam National University Medical School, Hwasun, South Korea
| | - Woo-Kyun Bae
- Department of Internal Medicine, Chonnam National University Medical School, Hwasun, South Korea.,Combinatorial Tumor Immunotherapy MRC, Clinical Vaccine R&D Center and Department of Microbiology, Chonnam National University Medical School, Hwasun, South Korea
| | - Joon Haeng Rhee
- Combinatorial Tumor Immunotherapy MRC, Clinical Vaccine R&D Center and Department of Microbiology, Chonnam National University Medical School, Hwasun, South Korea
| | - Sang-Hee Cho
- Department of Internal Medicine, Chonnam National University Medical School, Hwasun, South Korea
| | - Ik-Joo Chung
- Department of Internal Medicine, Chonnam National University Medical School, Hwasun, South Korea.,Combinatorial Tumor Immunotherapy MRC, Clinical Vaccine R&D Center and Department of Microbiology, Chonnam National University Medical School, Hwasun, South Korea
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17
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Sarkar B, Nishikata I, Nakahata S, Ichikawa T, Shiraga T, Saha HR, Fujii M, Tanaka Y, Shimoda K, Morishita K. Degradation of p47 by autophagy contributes to CADM1 overexpression in ATLL cells through the activation of NF-κB. Sci Rep 2019; 9:3491. [PMID: 30837480 PMCID: PMC6400899 DOI: 10.1038/s41598-019-39424-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Accepted: 06/25/2018] [Indexed: 12/20/2022] Open
Abstract
Cell adhesion molecule 1 (CADM1), a member of the immunoglobulin superfamily, is identified as a novel cell surface marker for human T-cell leukemia virus (HTLV-1)-infected T cells. Adult T-cell leukemia/lymphoma (ATLL) is developed in HTLV-1-infected T-cells after a long infection period. To examine the mechanism of CADM1 overexpression in ATLL, we first identified that CADM1 is transcriptionally up-regulated by a transcriptional enhancer element through NF-κB signaling pathway. In HTLV-1-infected T-cells, CADM1 expression is dependent on HTLV-1/Tax through activation of canonical and non-canonical NF-κB; however, in ATLL cells with frequent loss of Tax expression, the activation of canonical NF-κB only enhances the CADM1 expression. Along with active mutations in signaling molecules under T-cell recepor (TCR) signaling, degradation of p47, a negative regulator of NF-κB, was essential for activation of canonical NF-κB through stabilization of NEMO (NF-κB essential modulator). The mechanism of p47 degradation is primarily dependent on activation of lysosomal-autophagy and the autophagy is activated in most of the HTLV-infected and ATLL cells, suggesting that the p47 degradation may be a first key molecular event during HTLV-1 infection to T-cells as a connector of two important signaling pathways, NF-κB and autophagy.
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Affiliation(s)
- Bidhan Sarkar
- Division of Tumor and Cellular Biochemistry, Department of Medical Sciences, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
| | - Ichiro Nishikata
- Division of Tumor and Cellular Biochemistry, Department of Medical Sciences, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
| | - Shingo Nakahata
- Division of Tumor and Cellular Biochemistry, Department of Medical Sciences, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
| | - Tomonaga Ichikawa
- Division of Tumor and Cellular Biochemistry, Department of Medical Sciences, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
| | - Toshiyuki Shiraga
- Division of Tumor and Cellular Biochemistry, Department of Medical Sciences, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan.,Department of Foods and Human Nutrition, Faculty of Human Life Sciences, Notre Dame Seishin University, Okayama, Japan
| | - Hasi Rani Saha
- Division of Tumor and Cellular Biochemistry, Department of Medical Sciences, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
| | - Masahiro Fujii
- Division of Virology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Yuetsu Tanaka
- Department of Immunology, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan
| | - Kazuya Shimoda
- Division of Gastroenterology and Hematology, Department of Internal Medicine, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
| | - Kazuhiro Morishita
- Division of Tumor and Cellular Biochemistry, Department of Medical Sciences, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan.
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18
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Jang YJ, Kim JH, Byun S. Modulation of Autophagy for Controlling Immunity. Cells 2019; 8:cells8020138. [PMID: 30744138 PMCID: PMC6406335 DOI: 10.3390/cells8020138] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 02/01/2019] [Accepted: 02/07/2019] [Indexed: 02/07/2023] Open
Abstract
Autophagy is an essential process that maintains physiological homeostasis by promoting the transfer of cytoplasmic constituents to autophagolysosomes for degradation. In immune cells, the autophagy pathway plays an additional role in facilitating proper immunological functions. Specifically, the autophagy pathway can participate in controlling key steps in innate and adaptive immunity. Accordingly, alterations in autophagy have been linked to inflammatory diseases and defective immune responses against pathogens. In this review, we discuss the various roles of autophagy signaling in coordinating immune responses and how these activities are connected to pathological conditions. We highlight the therapeutic potential of autophagy modulators that can impact immune responses and the mechanisms of action responsible.
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Affiliation(s)
- Young Jin Jang
- Research Group of Natural Materials and Metabolism, Korea Food Research Institute, Wanjugun55365, Korea.
| | - Jae Hwan Kim
- Department of Agricultural Biotechnology, Seoul National University, Seoul 08826, Korea.
| | - Sanguine Byun
- Division of Bioengineering, Incheon National University, Incheon 22012, Korea.
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19
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p47 licenses activation of the immune deficiency pathway in the tick Ixodes scapularis. Proc Natl Acad Sci U S A 2018; 116:205-210. [PMID: 30559180 DOI: 10.1073/pnas.1808905116] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The E3 ubiquitin ligase X-linked inhibitor of apoptosis (XIAP) acts as a molecular rheostat for the immune deficiency (IMD) pathway of the tick Ixodes scapularis How XIAP activates the IMD pathway in response to microbial infection remains ill defined. Here, we identified the XIAP enzymatic substrate p47 as a positive regulator of the I. scapularis IMD network. XIAP polyubiquitylates p47 in a lysine 63-dependent manner and interacts with the p47 ubiquitin-like (UBX) module. p47 also binds to Kenny (IKKγ/NEMO), the regulatory subunit of the inhibitor of nuclear factor (NF)- κB kinase complex. Replacement of the amino acid lysine to arginine within the p47 linker region completely abrogated molecular interactions with Kenny. Furthermore, mitigation of p47 transcription levels through RNA interference in I. scapularis limited Kenny accumulation, reduced phosphorylation of IKKβ (IRD5), and impaired cleavage of the NF-κB molecule Relish. Accordingly, disruption of p47 expression increased microbial colonization by the Lyme disease spirochete Borrelia burgdorferi and the rickettsial agent Anaplasma phagocytophilum Collectively, we highlight the importance of ticks for the elucidation of paradigms in arthropod immunology. Manipulating immune signaling cascades within I. scapularis may lead to innovative approaches to reducing the burden of tick-borne diseases.
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20
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Yamagishi M, Fujikawa D, Watanabe T, Uchimaru K. HTLV-1-Mediated Epigenetic Pathway to Adult T-Cell Leukemia-Lymphoma. Front Microbiol 2018; 9:1686. [PMID: 30087673 PMCID: PMC6066519 DOI: 10.3389/fmicb.2018.01686] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Accepted: 07/06/2018] [Indexed: 11/13/2022] Open
Abstract
Human T-cell leukemia virus type 1 (HTLV-1), the first reported human oncogenic retrovirus, is the etiologic agent of highly aggressive, currently incurable diseases such as adult T-cell leukemia-lymphoma (ATL) and HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). HTLV-1 proteins, including Tax and HBZ, have been shown to have critical roles in HTLV-1 pathogenicity, yet the underlying mechanisms of HTLV-1-driven leukemogenesis are unclear. The frequent disruption of genetic and epigenetic gene regulation in various types of malignancy, including ATL, is evident. In this review, we illustrate a focused range of topics about the establishment of HTLV-1 memory: (1) genetic lesion in the Tax interactome pathway, (2) gene regulatory loop/switch, (3) disordered chromatin regulation, (4) epigenetic lock by the modulation of epigenetic factors, (5) the loss of gene fine-tuner microRNA, and (6) the alteration of chromatin regulation by HTLV-1 integration. We discuss the persistent influence of Tax-dependent epigenetic changes even after the disappearance of HTLV-1 gene expression due to the viral escape from the immune system, which is a remaining challenge in HTLV-1 research. The summarized evidence and conceptualized description may provide a better understanding of HTLV-1-mediated cellular transformation and the potential therapeutic strategies to combat HTLV-1-associated diseases.
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Affiliation(s)
- Makoto Yamagishi
- Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Tokyo, Japan
| | - Dai Fujikawa
- Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Tokyo, Japan
| | - Toshiki Watanabe
- The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Kaoru Uchimaru
- Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Tokyo, Japan
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21
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Uematsu A, Kido K, Manabe E, Takeda H, Takahashi H, Hayashi M, Imai Y, Sawasaki T. DANFIN functions as an inhibitor of transcription factor NF-κB and potentiates the antitumor effect of bortezomib in multiple myeloma. Biochem Biophys Res Commun 2017; 495:2289-2295. [PMID: 29284118 DOI: 10.1016/j.bbrc.2017.12.142] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2017] [Accepted: 12/22/2017] [Indexed: 01/06/2023]
Abstract
Nuclear factor-κB (NF-κB) proteins are transcription factors that play key roles in regulating most immune responses and cell death. Constitutively active NF-κB has been shown to exhibit chemoresistance by inducing anti-apoptosis in tumor cells. Multiple myeloma is known as a constitutive NF-κB activating disease, and the proteasome inhibitor bortezomib is used to treat multiple myeloma and mantle cell lymphoma. We demonstrate here that DANFIN (N,N'-bis-(2,4-dimethyl-phenyl)-ethane-1,2-diamine) functions as an inhibitor of the p65 family proteins and induces chemosensitization to bortezomib in multiple myeloma. DANFIN was found to be an inhibitor of interactions between p65 and IκBα without the inhibition of the DNA binding activity of the p65 protein. In addition, DANFIN affected the IκBα binding region in Rel Homology Domain (RHD) and suppressed the nuclear translocalization of the p65 protein in cells. Furthermore, in multiple myeloma cells, DANFIN suppressed the expression level of NF-κB target genes and induced apoptosis. The combination therapy of DANFIN with bortezomib dramatically enhanced the apoptosis of multiple myeloma cells and indicated a remarkable anti-tumor effect in a multiple-myeloma xenograft mouse model.
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Affiliation(s)
- Atsushi Uematsu
- Division of Cell-Free Sciences, Proteo-Science Center (PROS), Ehime University, Japan
| | - Kohki Kido
- Division of Cell-Free Sciences, Proteo-Science Center (PROS), Ehime University, Japan
| | - Erika Manabe
- Division of Cell-Free Sciences, Proteo-Science Center (PROS), Ehime University, Japan
| | - Hiroyuki Takeda
- Division of Proteo-Drug-Discovery Sciences, PROS, Ehime University, Japan
| | - Hirotaka Takahashi
- Division of Cell-Free Sciences, Proteo-Science Center (PROS), Ehime University, Japan
| | - Minoru Hayashi
- Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University, Japan
| | - Yuuki Imai
- Division of Integrative Pathophysiology, PROS, Ehime University, Japan
| | - Tatsuya Sawasaki
- Division of Cell-Free Sciences, Proteo-Science Center (PROS), Ehime University, Japan.
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22
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Zhang Y, Guo X, Yan W, Chen Y, Ke M, Cheng C, Zhu X, Xue W, Zhou Q, Zheng L, Wang S, Wu B, Liu X, Ma L, Huang L, Huang K. ANGPTL8 negatively regulates NF-κB activation by facilitating selective autophagic degradation of IKKγ. Nat Commun 2017; 8:2164. [PMID: 29255244 PMCID: PMC5735157 DOI: 10.1038/s41467-017-02355-w] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Accepted: 11/22/2017] [Indexed: 12/29/2022] Open
Abstract
Excessive nuclear factor-κB (NF-κB) activation mediated by tumor necrosis factor α (TNFα) plays a critical role in inflammation. Here we demonstrate that angiopoietin-like 8 (ANGPTL8) functions as a negative feedback regulator in TNFα-triggered NF-κB activation intracellularly. Inflammatory stimuli induce ANGPTL8 expression, and knockdown or knockout of ANGPTL8 potentiates TNFα-induced NF-κB activation in vitro. Mechanistically, upon TNFα stimulation, ANGPTL8 facilitates the interaction of IKKγ with p62 via forming a complex, thus promoting the selective autophagic degradation of IKKγ. Furthermore, the N-terminal domain mediated self-oligomerization of ANGPTL8 is essential for IKKγ degradation and NF-κB activation. In vivo, circulating ANGPTL8 level is high in patients diagnosed with infectious diseases, and the ANGPTL8/p62-IKKγ axis is responsive to inflammatory stimuli in the liver of LPS-injected mice. Altogether, our study suggests the ANGPTL8/p62-IKKγ axis as a negative feedback loop that regulates NF-κB activation, and extends the role of selective autophagy in fine-tuned inflammatory responses. NF-κB activation mediated by TNFα has a critical role in inflammation; however, the underlying mechanisms await further investigation. Here the authors show that selective autophagy regulates NF-κB activation via an ANGPTL8/p62-IKKγ signaling axis.
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Affiliation(s)
- Yu Zhang
- Tongji School of Pharmacy, Huazhong University of Science & Technology, Wuhan, 430030, China
| | - Xian Guo
- Tongji School of Pharmacy, Huazhong University of Science & Technology, Wuhan, 430030, China
| | - Wanyao Yan
- Tongji School of Pharmacy, Huazhong University of Science & Technology, Wuhan, 430030, China
| | - Yan Chen
- Tongji School of Pharmacy, Huazhong University of Science & Technology, Wuhan, 430030, China
| | - Mengxiang Ke
- Tongji School of Pharmacy, Huazhong University of Science & Technology, Wuhan, 430030, China
| | - Cheng Cheng
- Tongji School of Pharmacy, Huazhong University of Science & Technology, Wuhan, 430030, China
| | - Xiuqin Zhu
- Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan, 430072, China
| | - Weili Xue
- Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan, 430072, China
| | - Qiaoqiao Zhou
- Tongji School of Pharmacy, Huazhong University of Science & Technology, Wuhan, 430030, China
| | - Ling Zheng
- Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan, 430072, China
| | - Shun Wang
- Department of Blood Transfusion, Wuhan Hospital of Traditional and Western Medicine, Wuhan, 430022, China
| | - Bin Wu
- Department of Blood Transfusion, Wuhan Hospital of Traditional and Western Medicine, Wuhan, 430022, China
| | - Xinran Liu
- Tongji School of Pharmacy, Huazhong University of Science & Technology, Wuhan, 430030, China
| | - Liang Ma
- Tongji School of Pharmacy, Huazhong University of Science & Technology, Wuhan, 430030, China
| | - Lianqi Huang
- Tongji School of Pharmacy, Huazhong University of Science & Technology, Wuhan, 430030, China
| | - Kun Huang
- Tongji School of Pharmacy, Huazhong University of Science & Technology, Wuhan, 430030, China. .,Centre for Biomedicine Research, Wuhan Institute of Biotechnology, Wuhan, 430075, China.
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23
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Chew CL, Conos SA, Unal B, Tergaonkar V. Noncoding RNAs: Master Regulators of Inflammatory Signaling. Trends Mol Med 2017; 24:66-84. [PMID: 29246760 DOI: 10.1016/j.molmed.2017.11.003] [Citation(s) in RCA: 131] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Revised: 11/13/2017] [Accepted: 11/14/2017] [Indexed: 12/15/2022]
Abstract
Inflammatory signaling underlies many diseases, from arthritis to cancer. Our understanding of inflammation has thus far been limited to the world of proteins, because we are only just beginning to understand the role that noncoding RNAs (ncRNA) might play. It is now clear that ncRNA do not constitute transcriptional 'noise' but instead harbor physiological functions in controlling signaling pathways. In this review, we cover the newly discovered mechanisms and functions of ncRNAs in the regulation of inflammatory signaling. We also describe advances in experimental techniques allowing this field of research to take root. These findings have opened new avenues for putative therapeutic intervention in inflammatory diseases, which may be seen translated into clinical outcomes in the future.
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Affiliation(s)
- Chen Li Chew
- Institute of Molecular and Cell Biology (IMCB), A*STAR (Agency for Science, Technology and Research), Singapore 138673, Singapore; These authors contributed equally
| | - Stephanie Ana Conos
- Institute of Molecular and Cell Biology (IMCB), A*STAR (Agency for Science, Technology and Research), Singapore 138673, Singapore; These authors contributed equally
| | - Bilal Unal
- Institute of Molecular and Cell Biology (IMCB), A*STAR (Agency for Science, Technology and Research), Singapore 138673, Singapore; Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore (NUS), Singapore 117597, Singapore
| | - Vinay Tergaonkar
- Institute of Molecular and Cell Biology (IMCB), A*STAR (Agency for Science, Technology and Research), Singapore 138673, Singapore; Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore (NUS), Singapore 117597, Singapore; Cancer Science Institute of Singapore, Singapore 117599, Singapore; Centre for Cancer Biology (University of South Australia and SA Pathology), Adelaide, SA 5000, Australia.
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24
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Tusco R, Jacomin AC, Jain A, Penman BS, Larsen KB, Johansen T, Nezis IP. Kenny mediates selective autophagic degradation of the IKK complex to control innate immune responses. Nat Commun 2017. [PMID: 29097655 DOI: 10.1016/j.jpowsour.2018.02.061] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023] Open
Abstract
Selective autophagy is a catabolic process with which cellular material is specifically targeted for degradation by lysosomes. The function of selective autophagic degradation of self-components in the regulation of innate immunity is still unclear. Here we show that Drosophila Kenny, the homolog of mammalian IKKγ, is a selective autophagy receptor that mediates the degradation of the IκB kinase complex. Selective autophagic degradation of the IκB kinase complex prevents constitutive activation of the immune deficiency pathway in response to commensal microbiota. We show that autophagy-deficient flies have a systemic innate immune response that promotes a hyperplasia phenotype in the midgut. Remarkably, human IKKγ does not interact with mammalian Atg8-family proteins. Using a mathematical model, we suggest mechanisms by which pathogen selection might have driven the loss of LIR motif functionality during evolution. Our results suggest that there may have been an autophagy-related switch during the evolution of the IKKγ proteins in metazoans.
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Affiliation(s)
- Radu Tusco
- School of Life Sciences, University of Warwick, CV4 7AL, Coventry, UK
| | | | - Ashish Jain
- Molecular Cancer Research Group, Institute of Medical Biology, University of Tromsø - The Arctic University of Norway, 9037, Tromsø, Norway
- Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital, Montebello, N-0379, Oslo, Norway
- Centre for Cancer Biomedicine, Faculty of Medicine, University of Oslo, Montebello, N-0379, Oslo, Norway
| | - Bridget S Penman
- School of Life Sciences, University of Warwick, CV4 7AL, Coventry, UK
| | - Kenneth Bowitz Larsen
- Molecular Cancer Research Group, Institute of Medical Biology, University of Tromsø - The Arctic University of Norway, 9037, Tromsø, Norway
| | - Terje Johansen
- Molecular Cancer Research Group, Institute of Medical Biology, University of Tromsø - The Arctic University of Norway, 9037, Tromsø, Norway
| | - Ioannis P Nezis
- School of Life Sciences, University of Warwick, CV4 7AL, Coventry, UK.
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25
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Tusco R, Jacomin AC, Jain A, Penman BS, Larsen KB, Johansen T, Nezis IP. Kenny mediates selective autophagic degradation of the IKK complex to control innate immune responses. Nat Commun 2017; 8:1264. [PMID: 29097655 PMCID: PMC5668318 DOI: 10.1038/s41467-017-01287-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 09/06/2017] [Indexed: 12/23/2022] Open
Abstract
Selective autophagy is a catabolic process with which cellular material is specifically targeted for degradation by lysosomes. The function of selective autophagic degradation of self-components in the regulation of innate immunity is still unclear. Here we show that Drosophila Kenny, the homolog of mammalian IKKγ, is a selective autophagy receptor that mediates the degradation of the IκB kinase complex. Selective autophagic degradation of the IκB kinase complex prevents constitutive activation of the immune deficiency pathway in response to commensal microbiota. We show that autophagy-deficient flies have a systemic innate immune response that promotes a hyperplasia phenotype in the midgut. Remarkably, human IKKγ does not interact with mammalian Atg8-family proteins. Using a mathematical model, we suggest mechanisms by which pathogen selection might have driven the loss of LIR motif functionality during evolution. Our results suggest that there may have been an autophagy-related switch during the evolution of the IKKγ proteins in metazoans. Selective autophagy describes the selective degradation of cellular components upon stress or nutrient deficiency, but whether it modulates innate immunity is unclear. Here the authors show that Drosophila Kenny may be an evolution-selected autophagy receptor for the down-regulation of innate NF-κB activation
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Affiliation(s)
- Radu Tusco
- School of Life Sciences, University of Warwick, CV4 7AL, Coventry, UK
| | | | - Ashish Jain
- Molecular Cancer Research Group, Institute of Medical Biology, University of Tromsø - The Arctic University of Norway, 9037, Tromsø, Norway.,Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital, Montebello, N-0379, Oslo, Norway.,Centre for Cancer Biomedicine, Faculty of Medicine, University of Oslo, Montebello, N-0379, Oslo, Norway
| | - Bridget S Penman
- School of Life Sciences, University of Warwick, CV4 7AL, Coventry, UK
| | - Kenneth Bowitz Larsen
- Molecular Cancer Research Group, Institute of Medical Biology, University of Tromsø - The Arctic University of Norway, 9037, Tromsø, Norway
| | - Terje Johansen
- Molecular Cancer Research Group, Institute of Medical Biology, University of Tromsø - The Arctic University of Norway, 9037, Tromsø, Norway
| | - Ioannis P Nezis
- School of Life Sciences, University of Warwick, CV4 7AL, Coventry, UK.
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26
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Koga R, Radwan MO, Ejima T, Kanemaru Y, Tateishi H, Ali TFS, Ciftci HI, Shibata Y, Taguchi Y, Inoue JI, Otsuka M, Fujita M. A Dithiol Compound Binds to the Zinc Finger Protein TRAF6 and Suppresses Its Ubiquitination. ChemMedChem 2017; 12:1935-1941. [DOI: 10.1002/cmdc.201700399] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Revised: 09/08/2017] [Indexed: 11/05/2022]
Affiliation(s)
- Ryoko Koga
- Department of Bioorganic Medicinal Chemistry; Faculty of Life Sciences; Kumamoto University; Chuo-ku 862-0973 Kumamoto Japan
| | - Mohamed O. Radwan
- Department of Bioorganic Medicinal Chemistry; Faculty of Life Sciences; Kumamoto University; Chuo-ku 862-0973 Kumamoto Japan
- Department of Chemistry of Natural Compounds; National Research Center; 12622 Dokki Cairo Egypt
| | - Tomohiko Ejima
- Department of Bioorganic Medicinal Chemistry; Faculty of Life Sciences; Kumamoto University; Chuo-ku 862-0973 Kumamoto Japan
| | - Yosuke Kanemaru
- Department of Bioorganic Medicinal Chemistry; Faculty of Life Sciences; Kumamoto University; Chuo-ku 862-0973 Kumamoto Japan
| | - Hiroshi Tateishi
- Department of Bioorganic Medicinal Chemistry; Faculty of Life Sciences; Kumamoto University; Chuo-ku 862-0973 Kumamoto Japan
| | - Taha F. S. Ali
- Department of Bioorganic Medicinal Chemistry; Faculty of Life Sciences; Kumamoto University; Chuo-ku 862-0973 Kumamoto Japan
| | - Halil Ibrahim Ciftci
- Department of Bioorganic Medicinal Chemistry; Faculty of Life Sciences; Kumamoto University; Chuo-ku 862-0973 Kumamoto Japan
| | - Yuri Shibata
- Division of Cellular and Molecular Biology; Institute of Medical Science; The University of Tokyo; Minato-ku 108-8639 Tokyo Japan
| | - Yuu Taguchi
- Division of Cellular and Molecular Biology; Institute of Medical Science; The University of Tokyo; Minato-ku 108-8639 Tokyo Japan
| | - Jun-ichiro Inoue
- Division of Cellular and Molecular Biology; Institute of Medical Science; The University of Tokyo; Minato-ku 108-8639 Tokyo Japan
| | - Masami Otsuka
- Department of Bioorganic Medicinal Chemistry; Faculty of Life Sciences; Kumamoto University; Chuo-ku 862-0973 Kumamoto Japan
| | - Mikako Fujita
- Research Institute for Drug Discovery; School of Pharmacy; Kumamoto University; Chuo-ku 862-0973 Kumamoto Japan
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27
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The AAA+ ATPase p97, a cellular multitool. Biochem J 2017; 474:2953-2976. [PMID: 28819009 PMCID: PMC5559722 DOI: 10.1042/bcj20160783] [Citation(s) in RCA: 100] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 07/17/2017] [Accepted: 07/21/2017] [Indexed: 12/17/2022]
Abstract
The AAA+ (ATPases associated with diverse cellular activities) ATPase p97 is essential to a wide range of cellular functions, including endoplasmic reticulum-associated degradation, membrane fusion, NF-κB (nuclear factor kappa-light-chain-enhancer of activated B cells) activation and chromatin-associated processes, which are regulated by ubiquitination. p97 acts downstream from ubiquitin signaling events and utilizes the energy from ATP hydrolysis to extract its substrate proteins from cellular structures or multiprotein complexes. A multitude of p97 cofactors have evolved which are essential to p97 function. Ubiquitin-interacting domains and p97-binding domains combine to form bi-functional cofactors, whose complexes with p97 enable the enzyme to interact with a wide range of ubiquitinated substrates. A set of mutations in p97 have been shown to cause the multisystem proteinopathy inclusion body myopathy associated with Paget's disease of bone and frontotemporal dementia. In addition, p97 inhibition has been identified as a promising approach to provoke proteotoxic stress in tumors. In this review, we will describe the cellular processes governed by p97, how the cofactors interact with both p97 and its ubiquitinated substrates, p97 enzymology and the current status in developing p97 inhibitors for cancer therapy.
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28
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Cosin-Roger J, Simmen S, Melhem H, Atrott K, Frey-Wagner I, Hausmann M, de Vallière C, Spalinger MR, Spielmann P, Wenger RH, Zeitz J, Vavricka SR, Rogler G, Ruiz PA. Hypoxia ameliorates intestinal inflammation through NLRP3/mTOR downregulation and autophagy activation. Nat Commun 2017; 8:98. [PMID: 28740109 PMCID: PMC5524634 DOI: 10.1038/s41467-017-00213-3] [Citation(s) in RCA: 207] [Impact Index Per Article: 29.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Accepted: 06/09/2017] [Indexed: 12/19/2022] Open
Abstract
Hypoxia regulates autophagy and nucleotide-binding oligomerization domain receptor, pyrin domain containing (NLRP)3, two innate immune mechanisms linked by mutual regulation and associated to IBD. Here we show that hypoxia ameliorates inflammation during the development of colitis by modulating autophagy and mammalian target of rapamycin (mTOR)/NLRP3 pathway. Hypoxia significantly reduces tumor necrosis factor α, interleukin (IL)-6 and NLRP3 expression, and increases the turnover of the autophagy protein p62 in colon biopsies of Crohn’s disease patients, and in samples from dextran sulfate sodium-treated mice and Il-10−/− mice. In vitro, NF-κB signaling and NLRP3 expression are reduced through hypoxia-induced autophagy. We also identify NLRP3 as a novel binding partner of mTOR. Dimethyloxalylglycine-mediated hydroxylase inhibition ameliorates colitis in mice, downregulates NLRP3 and promotes autophagy. We suggest that hypoxia counteracts inflammation through the downregulation of the binding of mTOR and NLRP3 and activation of autophagy. Hypoxia and HIF-1α activation are protective in mouse models of colitis, and the latter regulates autophagy. Here Cosin-Roger et al. show that hypoxia ameliorates intestinal inflammation in Crohn’s patients and murine colitis models by inhibiting mTOR/NLRP3 pathway and promoting autophagy.
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Affiliation(s)
- Jesus Cosin-Roger
- Department of Gastroenterology and Hepatology, University Hospital Zurich, University of Zurich, Rämistrasse 100, 8091, Zurich, Switzerland
| | - Simona Simmen
- Department of Gastroenterology and Hepatology, University Hospital Zurich, University of Zurich, Rämistrasse 100, 8091, Zurich, Switzerland
| | - Hassan Melhem
- Department of Gastroenterology and Hepatology, University Hospital Zurich, University of Zurich, Rämistrasse 100, 8091, Zurich, Switzerland
| | - Kirstin Atrott
- Department of Gastroenterology and Hepatology, University Hospital Zurich, University of Zurich, Rämistrasse 100, 8091, Zurich, Switzerland
| | - Isabelle Frey-Wagner
- Department of Gastroenterology and Hepatology, University Hospital Zurich, University of Zurich, Rämistrasse 100, 8091, Zurich, Switzerland
| | - Martin Hausmann
- Department of Gastroenterology and Hepatology, University Hospital Zurich, University of Zurich, Rämistrasse 100, 8091, Zurich, Switzerland
| | - Cheryl de Vallière
- Department of Gastroenterology and Hepatology, University Hospital Zurich, University of Zurich, Rämistrasse 100, 8091, Zurich, Switzerland
| | - Marianne R Spalinger
- Department of Gastroenterology and Hepatology, University Hospital Zurich, University of Zurich, Rämistrasse 100, 8091, Zurich, Switzerland
| | - Patrick Spielmann
- Institute of Physiology, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland.,Zurich Center for Integrative Human Physiology (ZIHP), University of Zurich, 8057, Zurich, Switzerland
| | - Roland H Wenger
- Institute of Physiology, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland.,Zurich Center for Integrative Human Physiology (ZIHP), University of Zurich, 8057, Zurich, Switzerland
| | - Jonas Zeitz
- Department of Gastroenterology and Hepatology, University Hospital Zurich, University of Zurich, Rämistrasse 100, 8091, Zurich, Switzerland
| | - Stephan R Vavricka
- Department of Gastroenterology and Hepatology, University Hospital Zurich, University of Zurich, Rämistrasse 100, 8091, Zurich, Switzerland
| | - Gerhard Rogler
- Department of Gastroenterology and Hepatology, University Hospital Zurich, University of Zurich, Rämistrasse 100, 8091, Zurich, Switzerland.,Zurich Center for Integrative Human Physiology (ZIHP), University of Zurich, 8057, Zurich, Switzerland
| | - Pedro A Ruiz
- Department of Gastroenterology and Hepatology, University Hospital Zurich, University of Zurich, Rämistrasse 100, 8091, Zurich, Switzerland.
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29
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Macias-Ceja DC, Cosín-Roger J, Ortiz-Masiá D, Salvador P, Hernández C, Esplugues JV, Calatayud S, Barrachina MD. Stimulation of autophagy prevents intestinal mucosal inflammation and ameliorates murine colitis. Br J Pharmacol 2017; 174:2501-2511. [PMID: 28500644 DOI: 10.1111/bph.13860] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 05/02/2017] [Accepted: 05/03/2017] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND AND PURPOSE Defective autophagy contributes to the pathogenesis of inflammatory disorders such as inflammatory bowel disease and there are interactions between autophagy and inflammation. Here we have analysed the effects of autophagy stimulators on murine colitis. EXPERIMENTAL APPROACH Mice were treated with intrarectal administration of 2,4,6-trinitrobenzenesulfonic acid (TNBS) (3.5 mg·20 g-1 ) and body weight was measured daily. Histological damage was scored 2 or 4 days after treatment. Some mice received trehalose (3% in drinking water 3 weeks before TNBS administration) or a daily administration of rapamycin (1.25 mg·kg-1 , i.p.), betanin (1 g·kg-1 , i.p.) or betanin + 3-methyladenine (3MA) (10 mg·kg-1 , i.p.). Protein levels of p-mTOR, p62, LC3, BCL10, NFκB, IκBα and p-IκBα in mucosa were determined by Western blots and mRNA expression of TNFα, IL1β, IL6, IL10, COX2, CCR7, CD11c, inducible NOS and CD86 by qRT-PCR. KEY RESULTS Impaired autophagy associated with body weight loss and intestinal damage was detected in the mucosa of TNBS-treated mice. Administration of trehalose, rapamycin or betanin prevented the impaired autophagic flux induced by TNBS and decreased mucosal protein levels of BCL10, p-IκBα and NFκB-p65 and the expression of pro-inflammatory cytokines and M1 macrophage markers. Blockade of autophagosome formation by treatment with 3MA, prevented the reduction in protein levels of p62, BCL10, p-IκBα and NFκB-p65 induced by betanin in TNBS-treated mice and weakened the protective effects of betanin on murine colitis. CONCLUSIONS AND IMPLICATIONS Pharmacological stimulation of mucosal autophagy reduced intestinal inflammation and improved murine colitis.
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Affiliation(s)
| | - Jesús Cosín-Roger
- Departamento de Farmacología and CIBERehd, Facultad de Medicina, Universidad de Valencia, Valencia, Spain
| | - Dolores Ortiz-Masiá
- Departamento de Farmacología and CIBERehd, Facultad de Medicina, Universidad de Valencia, Valencia, Spain.,Departamento de Medicina, Facultad de Medicina, Universidad de Valencia, Valencia, Spain
| | - Pedro Salvador
- Departamento de Farmacología and CIBERehd, Facultad de Medicina, Universidad de Valencia, Valencia, Spain
| | - Carlos Hernández
- FISABIO, Hospital Dr. Peset, Valencia, Spain.,Departamento de Farmacología and CIBERehd, Facultad de Medicina, Universidad de Valencia, Valencia, Spain
| | - Juan V Esplugues
- FISABIO, Hospital Dr. Peset, Valencia, Spain.,Departamento de Farmacología and CIBERehd, Facultad de Medicina, Universidad de Valencia, Valencia, Spain
| | - Sara Calatayud
- Departamento de Farmacología and CIBERehd, Facultad de Medicina, Universidad de Valencia, Valencia, Spain
| | - María D Barrachina
- Departamento de Farmacología and CIBERehd, Facultad de Medicina, Universidad de Valencia, Valencia, Spain
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30
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Gao S, Wu J, Liang L, Xu R. RNF8 negatively regulates NF-kappaB signaling by targeting IkappaB kinase: implications for the regulation of inflammation signaling. Biochem Biophys Res Commun 2017; 488:189-195. [PMID: 28499869 DOI: 10.1016/j.bbrc.2017.05.033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2017] [Accepted: 05/05/2017] [Indexed: 10/19/2022]
Abstract
Persistent or excess activation of NF-κB leads to cancer, autoimmune and inflammatory diseases. Therefore, activated NF-κB needs to be terminated after induction, which highlights the physiological significance of NF-κB-negative regulators. However, the molecular mechanisms that negatively regulate NF-κB are not well understood. Here, we report that Ring Finger Protein 8 (RNF8), an E3 ubiquitin ligase, inhibits TNFα-mediated NF-κB activation by targeting IκB kinase (IKK). Upon TNFα stimulation, RNF8 binds to the catalytic subunits of IKK complex, resulting in inhibition of IKKα/β phosphorylation and subsequent NF-κB activation. RNF8 targets the IKK complex in a manner independent of its RING domain. We further provide evidence that the silencing of RNF8 results in enhanced TNFα-induced IKK activation, and an increase expression of NF-κB-induced inflammatory cytokine IL-8. Our study identifies a previously unrecognized role for RNF8 in the negative regulation of NF-κB activation by targeting and deactivating the IKK complex.
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Affiliation(s)
- Shijuan Gao
- Beijing Anzhen Hospital, Capital Medical University, The Key Laboratory of Remodeling-Related Cardiovascular Diseases, Ministry of Education, Beijing Institute of Heart Lung and Blood Vessel Diseases, Beijing Collaborative Innovative Research Center for Cardiovascular Diseases, Beijing 100029, China.
| | - Jiaoxiang Wu
- School of Medicine, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Lili Liang
- The First Affiliated Hospital of Dalian Medical University, Dalian 116011, China
| | - Ruixue Xu
- The First Affiliated Hospital of Dalian Medical University, Dalian 116011, China.
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31
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Messer JS. The cellular autophagy/apoptosis checkpoint during inflammation. Cell Mol Life Sci 2017; 74:1281-1296. [PMID: 27837217 PMCID: PMC11107496 DOI: 10.1007/s00018-016-2403-y] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Revised: 10/17/2016] [Accepted: 10/27/2016] [Indexed: 12/22/2022]
Abstract
Cell death is a major determinant of inflammatory disease severity. Whether cells live or die during inflammation largely depends on the relative success of the pro-survival process of autophagy versus the pro-death process of apoptosis. These processes interact and influence each other during inflammation and there is a checkpoint at which cells irrevocably commit to either one pathway or another. This review will discuss the concept of the autophagy/apoptosis checkpoint and its importance during inflammation, the mechanisms of inflammation leading up to the checkpoint, and how the checkpoint is regulated. Understanding these concepts is important since manipulation of the autophagy/apoptosis checkpoint represents a novel opportunity for treatment of inflammatory diseases caused by too much or too little cell death.
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Affiliation(s)
- Jeannette S Messer
- Department of Medicine, Knapp Center for Biomedical Discovery, University of Chicago, 900 E. 57th Street, 9th Floor, Chicago, IL, 60637, USA.
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32
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Cobll1 is linked to drug resistance and blastic transformation in chronic myeloid leukemia. Leukemia 2017; 31:1532-1539. [DOI: 10.1038/leu.2017.72] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Revised: 02/14/2017] [Accepted: 02/15/2017] [Indexed: 12/12/2022]
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33
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Shibata Y, Tokunaga F, Goto E, Komatsu G, Gohda J, Saeki Y, Tanaka K, Takahashi H, Sawasaki T, Inoue S, Oshiumi H, Seya T, Nakano H, Tanaka Y, Iwai K, Inoue JI. HTLV-1 Tax Induces Formation of the Active Macromolecular IKK Complex by Generating Lys63- and Met1-Linked Hybrid Polyubiquitin Chains. PLoS Pathog 2017; 13:e1006162. [PMID: 28103322 PMCID: PMC5283754 DOI: 10.1371/journal.ppat.1006162] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Revised: 01/31/2017] [Accepted: 01/01/2017] [Indexed: 11/18/2022] Open
Abstract
The Tax protein of human T-cell leukemia virus type 1 (HTLV-1) is crucial for the development of adult T-cell leukemia (ATL), a highly malignant CD4+ T cell neoplasm. Among the multiple aberrant Tax-induced effects on cellular processes, persistent activation of transcription factor NF-κB, which is activated only transiently upon physiological stimulation, is essential for leukemogenesis. We and others have shown that Tax induces activation of the IκB kinase (IKK) complex, which is a critical step in NF-κB activation, by generating Lys63-linked polyubiquitin chains. However, the molecular mechanism underlying Tax-induced IKK activation is controversial and not fully understood. Here, we demonstrate that Tax recruits linear (Met1-linked) ubiquitin chain assembly complex (LUBAC) to the IKK complex and that Tax fails to induce IKK activation in cells that lack LUBAC activity. Mass spectrometric analyses revealed that both Lys63-linked and Met1-linked polyubiquitin chains are associated with the IKK complex. Furthermore, treatment of the IKK-associated polyubiquitin chains with Met1-linked-chain-specific deubiquitinase (OTULIN) resulted in the reduction of high molecular weight polyubiquitin chains and the generation of short Lys63-linked ubiquitin chains, indicating that Tax can induce the generation of Lys63- and Met1-linked hybrid polyubiquitin chains. We also demonstrate that Tax induces formation of the active macromolecular IKK complex and that the blocking of Tax-induced polyubiquitin chain synthesis inhibited formation of the macromolecular complex. Taken together, these results lead us to propose a novel model in which the hybrid-chain-dependent oligomerization of the IKK complex triggered by Tax leads to trans-autophosphorylation-mediated IKK activation.
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Affiliation(s)
- Yuri Shibata
- Division of Cellular and Molecular Biology, Department of Cancer Biology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Fuminori Tokunaga
- Department of Pathobiochemistry, Graduate School of Medicine, Osaka City University, Osaka, Japan
| | - Eiji Goto
- Department of Pathobiochemistry, Graduate School of Medicine, Osaka City University, Osaka, Japan
| | - Ginga Komatsu
- Division of Cellular and Molecular Biology, Department of Cancer Biology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Jin Gohda
- Research Center for Asian Infectious Diseases, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Yasushi Saeki
- Laboratory of Protein Metabolism, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
| | - Keiji Tanaka
- Laboratory of Protein Metabolism, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
| | | | | | - Satoshi Inoue
- Department of Anti-Aging Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Hiroyuki Oshiumi
- Department of Microbiology and Immunology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Tsukasa Seya
- Department of Microbiology and Immunology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Hiroyasu Nakano
- Department of Biochemistry, Toho University School of Medicine, Tokyo, Japan
| | - Yuetsu Tanaka
- Division of Immunology, Faculty of Medicine, University of the Ryukyus, Okinawa, Japan
| | - Kazuhiro Iwai
- Department of Molecular and Cellular Physiology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Jun-ichiro Inoue
- Division of Cellular and Molecular Biology, Department of Cancer Biology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
- * E-mail:
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Villa-Hernández S, Bueno A, Bermejo R. The Multiple Roles of Ubiquitylation in Regulating Challenged DNA Replication. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 1042:395-419. [PMID: 29357068 DOI: 10.1007/978-981-10-6955-0_18] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
DNA replication is essential for the propagation of life and the development of complex organisms. However, replication is a risky process as it can lead to mutations and chromosomal alterations. Conditions challenging DNA synthesis by replicative polymerases or DNA helix unwinding, generally termed as replication stress, can halt replication fork progression. Stalled replication forks are unstable, and mechanisms exist to protect their integrity, which promote an efficient restart of DNA synthesis and counteract fork collapse characterized by the accumulation of DNA lesions and mutagenic events. DNA replication is a highly regulated process, and several mechanisms control replication timing and integrity both during unperturbed cell cycles and in response to replication stress. Work over the last two decades has revealed that key steps of DNA replication are controlled by conjugation of the small peptide ubiquitin. While ubiquitylation was traditionally linked to protein degradation, the complexity and flexibility of the ubiquitin system in regulating protein function have recently emerged. Here we review the multiple roles exerted by ubiquitin-conjugating enzymes and ubiquitin-specific proteases, as well as readers of ubiquitin chains, in the control of eukaryotic DNA replication and replication-coupled DNA damage tolerance and repair.
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Affiliation(s)
| | - Avelino Bueno
- Instituto de Biología Molecular y Celular del Cáncer (USAL/CSIC), Salamanca, Spain.,Departamento de Microbiología y Genética, Universidad de Salamanca, Salamanca, Spain
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35
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Medunjanin S, Schleithoff L, Fiegehenn C, Weinert S, Zuschratter W, Braun-Dullaeus RC. GSK-3β controls NF-kappaB activity via IKKγ/NEMO. Sci Rep 2016; 6:38553. [PMID: 27929056 PMCID: PMC5144080 DOI: 10.1038/srep38553] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Accepted: 11/09/2016] [Indexed: 12/24/2022] Open
Abstract
The NF-κB signaling pathway is central for the innate immune response and its deregulation is found in multiple disorders such as autoimmune, chronic inflammatory and metabolic diseases. IKKγ/NEMO is essential for NF-κB activation and NEMO dysfunction in humans has been linked to so-called progeria syndromes, which are characterized by advanced ageing due to age-dependent inflammatory diseases. It has been suggested that glycogen synthase kinase-3β (GSK-3β) participates in NF-κB regulation but the exact mechanism remained incompletely understood. In this study, we identified NEMO as a GSK-3β substrate that is phosphorylated at serine 8, 17, 31 and 43 located within its N-terminal domain. The kinase forms a complex with wild-type NEMO while point mutations of NEMO at the specific serines abrogated GSK-3β binding and subsequent phosphorylation of NEMO resulting in its destabilization. However, K63-linked polyubiquitination was augmented in mutated NEMO explaining an increased binding to IKKα and IKKβ. Even IκBα was found degraded. Still, TNFα-stimulated NF-κB activation was impaired pointing towards an un-controlled signalling process. Our data suggest that GSK-3β is critically important for ordered NF-κB signalling through modulation of NEMO phosphorylation.
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Affiliation(s)
- Senad Medunjanin
- Internal Medicine/Cardiology and Angiology, Magdeburg University, Magdeburg, Germany
| | - Lisa Schleithoff
- Internal Medicine/Cardiology and Angiology, Magdeburg University, Magdeburg, Germany
| | - Christian Fiegehenn
- Internal Medicine/Cardiology and Angiology, Magdeburg University, Magdeburg, Germany
| | - Soenke Weinert
- Internal Medicine/Cardiology and Angiology, Magdeburg University, Magdeburg, Germany
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Rezvani K. UBXD Proteins: A Family of Proteins with Diverse Functions in Cancer. Int J Mol Sci 2016; 17:ijms17101724. [PMID: 27754413 PMCID: PMC5085755 DOI: 10.3390/ijms17101724] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Revised: 09/24/2016] [Accepted: 10/08/2016] [Indexed: 12/15/2022] Open
Abstract
The UBXD family is a diverse group of UBX (ubiquitin-regulatory X) domain-containing proteins in mammalian cells. Members of this family contain a UBX domain typically located at the carboxyl-terminal of the protein. In contrast to the UBX domain shared by all members of UBXD family, the amino-terminal domains are diverse and appear to carry out different roles in a subcellular localization-dependent manner. UBXD proteins are principally associated with the endoplasmic reticulum (ER), where they positively or negatively regulate the ER-associated degradation machinery (ERAD). The distinct protein interaction networks of UBXD proteins allow them to have specific functions independent of the ERAD pathway in a cell type- and tissue context-dependent manner. Recent reports have illustrated that a number of mammalian members of the UBXD family play critical roles in several proliferation and apoptosis pathways dysregulated in selected types of cancer. This review covers recent advances that elucidate the therapeutic potential of selected members of the UBXD family that can contribute to tumor growth.
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Affiliation(s)
- Khosrow Rezvani
- Division of Basic Biomedical Sciences, Sanford School of Medicine, The University of South Dakota, 414 E. Clark Street, Lee Medical Building, Vermillion, SD 57069, USA.
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37
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Kalliolias GD, Ivashkiv LB. TNF biology, pathogenic mechanisms and emerging therapeutic strategies. Nat Rev Rheumatol 2015; 12:49-62. [PMID: 26656660 DOI: 10.1038/nrrheum.2015.169] [Citation(s) in RCA: 801] [Impact Index Per Article: 89.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
TNF is a pleiotropic cytokine with important functions in homeostasis and disease pathogenesis. Recent discoveries have provided insights into TNF biology that introduce new concepts for the development of therapeutics for TNF-mediated diseases. The model of TNF receptor signalling has been extended to include linear ubiquitination and the formation of distinct signalling complexes that are linked with different functional outcomes, such as inflammation, apoptosis and necroptosis. Our understanding of TNF-induced gene expression has been enriched by the discovery of epigenetic mechanisms and concepts related to cellular priming, tolerization and induction of 'short-term transcriptional memory'. Identification of distinct homeostatic or pathogenic TNF-induced signalling pathways has introduced the concept of selectively inhibiting the deleterious effects of TNF while preserving its homeostatic bioactivities for therapeutic purposes. In this Review, we present molecular mechanisms underlying the roles of TNF in homeostasis and inflammatory disease pathogenesis, and discuss novel strategies to advance therapeutic paradigms for the treatment of TNF-mediated diseases.
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Affiliation(s)
- George D Kalliolias
- Arthritis &Tissue Degeneration Program and David Z. Rosensweig Center for Genomics Research, Hospital for Special Surgery, 535 E 70th Street, New York, New York 10021, USA
| | - Lionel B Ivashkiv
- Arthritis &Tissue Degeneration Program and David Z. Rosensweig Center for Genomics Research, Hospital for Special Surgery, 535 E 70th Street, New York, New York 10021, USA
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38
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Ichikawa T, Nakahata S, Fujii M, Iha H, Morishita K. Loss of NDRG2 enhanced activation of the NF-κB pathway by PTEN and NIK phosphorylation for ATL and other cancer development. Sci Rep 2015; 5:12841. [PMID: 26269411 PMCID: PMC4534796 DOI: 10.1038/srep12841] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2015] [Accepted: 07/13/2015] [Indexed: 12/17/2022] Open
Abstract
The activation of nuclear factor kappa B (NF-κB) signaling has a central role in the development of adult T-cell leukemia/lymphoma (ATL) and many other cancers. However, the activation mechanism of the NF-κB pathways remains poorly understood. Recently, we reported that N-myc downstream-regulated gene 2 (NDRG2) is a negative regulator of the phosphoinositide 3-kinase (PI3K)/AKT pathway by promoting the active dephosphorylated form of PTEN at its C-terminus via the recruitment of PP2A. Additionally, the down-regulation of NDRG2 expression promotes the inactive phosphorylated form of PTEN, which results in constitutively active PI3K/AKT signaling in various cancer cell types. Here, we investigated the involvement of NDRG2 in modulating NF-κB signaling. The forced expression of NDRG2 in ATL cells down-regulates not only the canonical pathway by inhibiting AKT signaling but also the non-canonical pathway by inducing NF-κB-inducing kinase (NIK) dephosphorylation via the recruitment of PP2A. Therefore, NDRG2 works as a PP2A recruiter to suppress not only PI3K/AKT signaling but also NF-κB signaling, which is particularly important in host defenses or immune responses to Human T-cell leukemia virus type 1 (HTLV-1) infection. Furthermore, the loss of NDRG2 expression might play an important role in the progression of tumor development after HTLV-1 infection.
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Affiliation(s)
- Tomonaga Ichikawa
- Division of Tumor and Cellular Biochemistry, Department of Medical Sciences, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki 889-1692, Japan
| | - Shingo Nakahata
- Division of Tumor and Cellular Biochemistry, Department of Medical Sciences, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki 889-1692, Japan
| | - Masahiro Fujii
- Division of Virology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Japan
| | - Hidekatsu Iha
- Department of Microbiology, Faculty of Medicine, Oita University, Yufu 879-5593, Oita, Japan
| | - Kazuhiro Morishita
- Division of Tumor and Cellular Biochemistry, Department of Medical Sciences, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki 889-1692, Japan
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Netea-Maier RT, Plantinga TS, van de Veerdonk FL, Smit JW, Netea MG. Modulation of inflammation by autophagy: Consequences for human disease. Autophagy 2015. [PMID: 26222012 PMCID: PMC4836004 DOI: 10.1080/15548627.2015.1071759] [Citation(s) in RCA: 265] [Impact Index Per Article: 29.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Autophagy and inflammation are 2 fundamental biological processes involved in both physiological and pathological conditions. Through its crucial role in maintaining cellular homeostasis, autophagy is involved in modulation of cell metabolism, cell survival, and host defense. Defective autophagy is associated with pathological conditions such as cancer, autoimmune disease, neurodegenerative disease, and senescence. Inflammation represents a crucial line of defense against microorganisms and other pathogens, and there is increasing evidence that autophagy has important effects on the induction and modulation of the inflammatory reaction; understanding the balance between these 2 processes may point to important possibilities for therapeutic targeting. This review focuses on the crosstalk between autophagy and inflammation as an emerging field with major implications for understanding the host defense on the one hand, and for the pathogenesis and treatment of immune-mediated diseases on the other hand.
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Affiliation(s)
- Romana T Netea-Maier
- a Department of Internal Medicine , Radboud University Medical Center , Nijmegen , The Netherlands.,b Division of Endocrinology, Radboud University Medical Center , Nijmegen , The Netherlands
| | - Theo S Plantinga
- a Department of Internal Medicine , Radboud University Medical Center , Nijmegen , The Netherlands
| | - Frank L van de Veerdonk
- a Department of Internal Medicine , Radboud University Medical Center , Nijmegen , The Netherlands.,c Radboud Center for Infectious Diseases, Radboud University Medical Center , Nijmegen , The Netherlands
| | - Johannes W Smit
- a Department of Internal Medicine , Radboud University Medical Center , Nijmegen , The Netherlands.,b Division of Endocrinology, Radboud University Medical Center , Nijmegen , The Netherlands
| | - Mihai G Netea
- a Department of Internal Medicine , Radboud University Medical Center , Nijmegen , The Netherlands.,c Radboud Center for Infectious Diseases, Radboud University Medical Center , Nijmegen , The Netherlands
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40
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Wang YB, Tan B, Mu R, Chang Y, Wu M, Tu HQ, Zhang YC, Guo SS, Qin XH, Li T, Li WH, Li AL, Zhang XM, Li HY. Ubiquitin-associated domain-containing ubiquitin regulatory X (UBX) protein UBXN1 is a negative regulator of nuclear factor κB (NF-κB) signaling. J Biol Chem 2015; 290:10395-405. [PMID: 25681446 DOI: 10.1074/jbc.m114.631689] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Indexed: 01/17/2023] Open
Abstract
Excessive nuclear factor κB (NF-κB) activation should be precisely controlled as it contributes to multiple immune and inflammatory diseases. However, the negative regulatory mechanisms of NF-κB activation still need to be elucidated. Various types of polyubiquitin chains have proved to be involved in the process of NF-κB activation. Many negative regulators linked to ubiquitination, such as A20 and CYLD, inhibit IκB kinase activation in the NF-κB signaling pathway. To find new NF-κB signaling regulators linked to ubiquitination, we used a small scale siRNA library against 51 ubiquitin-associated domain-containing proteins and screened out UBXN1, which contained both ubiquitin-associated and ubiquitin regulatory X (UBX) domains as a negative regulator of TNFα-triggered NF-κB activation. Overexpression of UBXN1 inhibited TNFα-triggered NF-κB activation, although knockdown of UBXN1 had the opposite effect. UBX domain-containing proteins usually act as valosin-containing protein (VCP)/p97 cofactors. However, knockdown of VCP/p97 barely affected UBXN1-mediated NF-κB inhibition. At the same time, we found that UBXN1 interacted with cellular inhibitors of apoptosis proteins (cIAPs), E3 ubiquitin ligases of RIP1 in the TNFα receptor complex. UBXN1 competitively bound to cIAP1, blocked cIAP1 recruitment to TNFR1, and sequentially inhibited RIP1 polyubiquitination in response to TNFα. Therefore, our findings demonstrate that UBXN1 is an important negative regulator of the TNFα-triggered NF-κB signaling pathway by mediating cIAP recruitment independent of VCP/p97.
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Affiliation(s)
- Yu-Bo Wang
- From the Institute of Basic Medical Sciences, National Center of Biomedical Analysis, Beijing 100850, China
| | - Bo Tan
- From the Institute of Basic Medical Sciences, National Center of Biomedical Analysis, Beijing 100850, China
| | - Rui Mu
- From the Institute of Basic Medical Sciences, National Center of Biomedical Analysis, Beijing 100850, China
| | - Yan Chang
- From the Institute of Basic Medical Sciences, National Center of Biomedical Analysis, Beijing 100850, China
| | - Min Wu
- From the Institute of Basic Medical Sciences, National Center of Biomedical Analysis, Beijing 100850, China
| | - Hai-Qing Tu
- From the Institute of Basic Medical Sciences, National Center of Biomedical Analysis, Beijing 100850, China
| | - Yu-Cheng Zhang
- From the Institute of Basic Medical Sciences, National Center of Biomedical Analysis, Beijing 100850, China
| | - Sai-Sai Guo
- From the Institute of Basic Medical Sciences, National Center of Biomedical Analysis, Beijing 100850, China
| | - Xuan-He Qin
- From the Institute of Basic Medical Sciences, National Center of Biomedical Analysis, Beijing 100850, China
| | - Tao Li
- From the Institute of Basic Medical Sciences, National Center of Biomedical Analysis, Beijing 100850, China
| | - Wei-Hua Li
- From the Institute of Basic Medical Sciences, National Center of Biomedical Analysis, Beijing 100850, China
| | - Ai-Ling Li
- From the Institute of Basic Medical Sciences, National Center of Biomedical Analysis, Beijing 100850, China
| | - Xue-Min Zhang
- From the Institute of Basic Medical Sciences, National Center of Biomedical Analysis, Beijing 100850, China
| | - Hui-Yan Li
- From the Institute of Basic Medical Sciences, National Center of Biomedical Analysis, Beijing 100850, China
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41
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Wu X, He L, Chen F, He X, Cai Y, Zhang G, Yi Q, He M, Luo J. Impaired autophagy contributes to adverse cardiac remodeling in acute myocardial infarction. PLoS One 2014; 9:e112891. [PMID: 25409294 PMCID: PMC4237367 DOI: 10.1371/journal.pone.0112891] [Citation(s) in RCA: 96] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2014] [Accepted: 10/16/2014] [Indexed: 11/18/2022] Open
Abstract
Objective Autophagy is activated in ischemic heart diseases, but its dynamics and functional roles remain unclear and controversial. In this study, we investigated the dynamics and role of autophagy and the mechanism(s), if any, during postinfarction cardiac remodeling. Methods and results Acute myocardial infarction (AMI) was induced by ligating left anterior descending (LAD) coronary artery. Autophagy was found to be induced sharply 12–24 hours after surgery by testing LC3 modification and Electron microscopy. P62 degradation in the infarct border zone was increased from day 0.5 to day 3, and however, decreased from day 5 until day 21 after LAD ligation. These results indicated that autophagy was induced in the acute phase of AMI, and however, impaired in the latter phase of AMI. To investigate the significance of the impaired autophagy in the latter phase of AMI, we treated the mice with Rapamycin (an autophagy enhancer, 2.0 mg/kg/day) or 3-methyladenine (3MA, an autophagy inhibitor, 15 mg/kg/day) one day after LAD ligation until the end of experiment. The results showed that Rapamycin attenuated, while 3MA exacerbated, postinfarction cardiac remodeling and dysfunction respectively. In addition, Rapamycin protected the H9C2 cells against oxygen glucose deprivation in vitro. Specifically, we found that Rapamycin attenuated NFκB activation after LAD ligation. And the inflammatory response in the acute stage of AMI was significantly restrained with Rapamycin treatment. In vitro, inhibition of NFκB restored autophagy in a negative reflex. Conclusion Sustained myocardial ischemia impairs cardiomyocyte autophagy, which is an essential mechanism that protects against adverse cardiac remodeling. Augmenting autophagy could be a therapeutic strategy for acute myocardial infarction.
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Affiliation(s)
- Xiaoqian Wu
- Department of Pharmacology, Guangzhou Medical University, Guangzhou, PR China
- * E-mail: (XW); (JL)
| | - Lishan He
- Department of Pharmacology, Guangzhou Medical University, Guangzhou, PR China
| | - Fajiang Chen
- Department of Pharmacology, Guangzhou Medical University, Guangzhou, PR China
| | - Xiaoen He
- Department of Pharmacology, Guangzhou Medical University, Guangzhou, PR China
| | - Yi Cai
- Department of Pharmacology, Guangzhou Medical University, Guangzhou, PR China
| | - Guiping Zhang
- Department of Pharmacology, Guangzhou Medical University, Guangzhou, PR China
- Guangzhou Institute of Cardiovascular Disease, Guangzhou Key Laboratory of Cardiovascular Disease, and the Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, PR China
| | - Quan Yi
- Department of Pharmacology, Guangzhou Medical University, Guangzhou, PR China
| | - Meixiang He
- Department of Pharmacology, Guangzhou Medical University, Guangzhou, PR China
| | - Jiandong Luo
- Department of Pharmacology, Guangzhou Medical University, Guangzhou, PR China
- Guangzhou Institute of Cardiovascular Disease, Guangzhou Key Laboratory of Cardiovascular Disease, and the Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, PR China
- * E-mail: (XW); (JL)
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42
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Involvement of A20 in the molecular switch that activates the non-canonical NF-кB pathway. Sci Rep 2014; 3:2568. [PMID: 24008839 PMCID: PMC3764444 DOI: 10.1038/srep02568] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2013] [Accepted: 08/19/2013] [Indexed: 12/13/2022] Open
Abstract
The non-canonical NF-κB pathway is crucial for the immune system. A critical event in activation of the non-canonical pathway is the attenuation of NF-κB-inducing kinase (NIK) degradation, which is promoted by continuous polyubiquitination of NIK catalyzed by the NIK ubiquitin-ligase complex composed of cellular inhibitor of apoptosis protein 1 and 2 (cIAP1/2), TNF receptor-associated factor 2 (TRAF2), and TRAF3. However, the molecular mechanism of stimulation-dependent NIK stabilization remains poorly understood. Here, we show that A20, a ubiquitin-editing enzyme, promotes efficient activation of the non-canonical pathway independent of its catalytic activity. A20 directly binds to cIAP1 through the seventh zinc finger of A20, resulting in dissociation of the TRAF2/TRAF3 interaction, thereby inactivating the ligase complex to stabilize NIK. Given that A20 negatively regulates the canonical pathway, A20 is likely involved in the molecular switch that promotes the transition from canonical to non-canonical activation for proper control of the immune system.
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43
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Hinz M, Scheidereit C. The IκB kinase complex in NF-κB regulation and beyond. EMBO Rep 2013; 15:46-61. [PMID: 24375677 DOI: 10.1002/embr.201337983] [Citation(s) in RCA: 386] [Impact Index Per Article: 35.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The IκB kinase (IKK) complex is the signal integration hub for NF-κB activation. Composed of two serine-threonine kinases (IKKα and IKKβ) and the regulatory subunit NEMO (also known as IKKγ), the IKK complex integrates signals from all NF-κB activating stimuli to catalyze the phosphorylation of various IκB and NF-κB proteins, as well as of other substrates. Since the discovery of the IKK complex components about 15 years ago, tremendous progress has been made in the understanding of the IKK architecture and its integration into signaling networks. In addition to the control of NF-κB, IKK subunits mediate the crosstalk with other pathways, thereby extending the complexity of their biological function. This review summarizes recent advances in IKK biology and focuses on emerging aspects of IKK structure, regulation and function.
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Affiliation(s)
- Michael Hinz
- Max Delbrück Center for Molecular Medicine, Berlin, Germany
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44
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Abstract
Autophagy is a fundamental eukaryotic pathway that has multiple effects on immunity. Autophagy is induced by pattern recognition receptors and, through autophagic adaptors, it provides a mechanism for the elimination of intracellular microorganisms. Autophagy controls inflammation through regulatory interactions with innate immune signalling pathways, by removing endogenous inflammasome agonists and through effects on the secretion of immune mediators. Moreover, autophagy contributes to antigen presentation and to T cell homeostasis, and it affects T cell repertoires and polarization. Thus, as we discuss in this Review, autophagy has multitiered immunological functions that influence infection, inflammation and immunity.
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45
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Kimura Y, Fukushi J, Hori S, Matsuda N, Okatsu K, Kakiyama Y, Kawawaki J, Kakizuka A, Tanaka K. Different dynamic movements of wild-type and pathogenic VCPs and their cofactors to damaged mitochondria in a Parkin-mediated mitochondrial quality control system. Genes Cells 2013; 18:1131-43. [DOI: 10.1111/gtc.12103] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2013] [Accepted: 09/12/2013] [Indexed: 12/28/2022]
Affiliation(s)
- Yoko Kimura
- Laboratory of Protein Metabolism; Tokyo Metropolitan Institute of Medical Science; Setagaya-ku Tokyo 156-8506 Japan
| | - Junpei Fukushi
- Laboratory of Functional Biology; Kyoto University Graduate School of Biostudies; Kyoto 606-8501 Japan
| | - Seiji Hori
- Laboratory of Functional Biology; Kyoto University Graduate School of Biostudies; Kyoto 606-8501 Japan
| | - Noriyuki Matsuda
- Laboratory of Protein Metabolism; Tokyo Metropolitan Institute of Medical Science; Setagaya-ku Tokyo 156-8506 Japan
| | - Kei Okatsu
- Laboratory of Protein Metabolism; Tokyo Metropolitan Institute of Medical Science; Setagaya-ku Tokyo 156-8506 Japan
- Department of Medical Genome Sciences; Graduate School of Frontier Sciences; The University of Tokyo; Kashiwa Chiba 277-8561 Japan
| | - Yukie Kakiyama
- Laboratory of Protein Metabolism; Tokyo Metropolitan Institute of Medical Science; Setagaya-ku Tokyo 156-8506 Japan
| | - Junko Kawawaki
- Laboratory of Protein Metabolism; Tokyo Metropolitan Institute of Medical Science; Setagaya-ku Tokyo 156-8506 Japan
| | - Akira Kakizuka
- Laboratory of Functional Biology; Kyoto University Graduate School of Biostudies; Kyoto 606-8501 Japan
| | - Keiji Tanaka
- Laboratory of Protein Metabolism; Tokyo Metropolitan Institute of Medical Science; Setagaya-ku Tokyo 156-8506 Japan
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46
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EGLN3 inhibition of NF-κB is mediated by prolyl hydroxylase-independent inhibition of IκB kinase γ ubiquitination. Mol Cell Biol 2013; 33:3050-61. [PMID: 23732909 DOI: 10.1128/mcb.00273-13] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
NF-κB transcription factors are crucial regulators of inflammation, immunity, stress responses, and cell differentiation. Many studies have demonstrated that ubiquitination of IκB kinase γ (IKKγ), a regulatory subunit of IKK, is instrumental in the activation of IKK and NF-κB. We and others previously identified EGLN3, a member of a family of prolyl hydroxylases, as a negative regulator of the NF-κB pathway. Here we report that EGLN3, but not EGLN1 or -2, interacts with and inhibits K63-linked ubiquitination of IKKγ. The effect appears to be related to inhibition of IKKγ ubiquitination mediated by cIAP1 rather than to stimulation of IKKγ deubiquitination by the deubiquitinases A20 and CYLD (cylindromatosis). EGLN3 does not affect the protein levels of cIAP1 or its E2 ubiquitin-conjugating enzymes UbcH5 and Ubc13. EGLN3 hydroxylase activity is not responsible for its effect on IKKγ ubiquitination and NF-κB signaling. Instead, interaction with IKKγ is required for the ability of EGLN3 to inhibit IKKγ ubiquitination and IKK-NF-κB signaling. EGLN3 competes with cIAP1 for IKKγ binding, leading to inhibition of cIAP1-IKKγ interaction, IKKγ ubiquitination, and IKK-NF-κB signaling. This study provides novel insights into EGLN3 function and sheds new light on the regulation of IKKγ ubiquitination and NF-κB.
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