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Ma Y, Hu Y, Ruan Y, Jiang X, Zhao M, Wang Y, Ke Y, Shi M, Lu G. Astragaloside IV relieves passive heymann nephritis and podocyte injury by suppressing the TRAF6/NF-κb axis. Ren Fail 2024; 46:2371992. [PMID: 39082739 PMCID: PMC11293271 DOI: 10.1080/0886022x.2024.2371992] [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: 01/05/2024] [Revised: 06/01/2024] [Accepted: 06/19/2024] [Indexed: 08/03/2024] Open
Abstract
The pathogenesis of membranous nephropathy (MN) involves podocyte injury that is attributed to inflammatory responses induced by local immune deposits. Astragaloside IV (AS-IV) is known for its robust anti-inflammatory properties. Here, we investigated the effects of AS-IV on passive Heymann nephritis (PHN) rats and TNF-α-induced podocytes to determine the underlying molecular mechanisms of MN. Serum biochemical parameters, 24-h urine protein excretion and renal histopathology were evaluated in PHN and control rats. The expression of tumor necrosis factor receptor associated factor 6 (TRAF6), the phosphorylation of nuclear factor kappa B (p-NF-κB), the expression of associated proinflammatory cytokines (TNF-α, IL-6 and IL-1β) and the ubiquitination of TRAF6 were measured in PHN rats and TNF-α-induced podocytes. We detected a marked increase in mRNA expression of TNF-α, IL-6 and IL-1β and in the protein abundance of p-NF-κB and TRAF6 within the renal tissues of PHN rats and TNF-α-induced podocytes. Conversely, there was a reduction in the K48-linked ubiquitination of TRAF6. Additionally, AS-IV was effective in ameliorating serum creatinine, proteinuria, and renal histopathology in PHN rats. This effect was concomitant with the suppression of NF-κB pathway activation and decreased expression of TNF-α, IL-6, IL-1β and TRAF6. AS-IV decreased TRAF6 levels by promoting K48-linked ubiquitin conjugation to TRAF6, which triggered ubiquitin-mediated degradation. In summary, AS-IV averted renal impairment in PHN rats and TNF-α-induced podocytes, likely by modulating the inflammatory response through the TRAF6/NF-κB axis. Targeting TRAF6 holds therapeutic promise for managing MN.
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Affiliation(s)
- Yuhua Ma
- Department of Nephrology, The First Affiliated Hospital of Soochow University, Soochow University, Suzhou, China
- Department of Nephrology, Traditional Chinese Medicine Hospital of Kunshan, Kunshan, China
| | - Yuwen Hu
- Center for inspection, Jiangsu Medical Products Administration, Nanjing, China
| | - Yilin Ruan
- Department of Nephrology, Shanghai Ruijin Hosptial, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Xiaocheng Jiang
- Department of Nephrology, Traditional Chinese Medicine Hospital of Kunshan, Kunshan, China
| | - Min Zhao
- School of Chinese Medicine, School of Integrated Chinese and Western Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Yuxin Wang
- Department of Nephrology, Traditional Chinese Medicine Hospital of Kunshan, Kunshan, China
| | - Yanrong Ke
- Department of Nephrology, Traditional Chinese Medicine Hospital of Kunshan, Kunshan, China
| | - Manman Shi
- Department of Nephrology, Traditional Chinese Medicine Hospital of Kunshan, Kunshan, China
| | - Guoyuan Lu
- Department of Nephrology, The First Affiliated Hospital of Soochow University, Soochow University, Suzhou, China
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Liu F, Chen J, Li K, Li H, Zhu Y, Zhai Y, Lu B, Fan Y, Liu Z, Chen X, Jia X, Dong Z, Liu K. Ubiquitination and deubiquitination in cancer: from mechanisms to novel therapeutic approaches. Mol Cancer 2024; 23:148. [PMID: 39048965 PMCID: PMC11270804 DOI: 10.1186/s12943-024-02046-3] [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: 04/17/2024] [Accepted: 06/15/2024] [Indexed: 07/27/2024] Open
Abstract
Ubiquitination, a pivotal posttranslational modification of proteins, plays a fundamental role in regulating protein stability. The dysregulation of ubiquitinating and deubiquitinating enzymes is a common feature in various cancers, underscoring the imperative to investigate ubiquitin ligases and deubiquitinases (DUBs) for insights into oncogenic processes and the development of therapeutic interventions. In this review, we discuss the contributions of the ubiquitin-proteasome system (UPS) in all hallmarks of cancer and progress in drug discovery. We delve into the multiple functions of the UPS in oncology, including its regulation of multiple cancer-associated pathways, its role in metabolic reprogramming, its engagement with tumor immune responses, its function in phenotypic plasticity and polymorphic microbiomes, and other essential cellular functions. Furthermore, we provide a comprehensive overview of novel anticancer strategies that leverage the UPS, including the development and application of proteolysis targeting chimeras (PROTACs) and molecular glues.
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Affiliation(s)
- Fangfang Liu
- Tianjian Laboratory of Advanced Biomedical Sciences, Academy of Medical Sciences, College of Medicine, Zhengzhou University, Zhengzhou, Henan, 450001, China
- China-US (Henan) Hormel Cancer Institute, Zhengzhou, Henan, 450000, China
| | - Jingyu Chen
- Department of Pediatric Medicine, School of Third Clinical Medical Sciences, Zhengzhou University, Zhengzhou, 450000, China
| | - Kai Li
- Department of Clinical Medicine, School of First Clinical Medical Sciences, Zhengzhou University, Zhengzhou, 450000, China
| | - Haochen Li
- Department of Clinical Medicine, School of First Clinical Medical Sciences, Zhengzhou University, Zhengzhou, 450000, China
| | - Yiyi Zhu
- Department of Clinical Medicine, School of First Clinical Medical Sciences, Zhengzhou University, Zhengzhou, 450000, China
| | - Yubo Zhai
- Department of Pathophysiology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, 450000, China
| | - Bingbing Lu
- Department of Pathophysiology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, 450000, China
| | - Yanle Fan
- China-US (Henan) Hormel Cancer Institute, Zhengzhou, Henan, 450000, China
| | - Ziyue Liu
- Department of Pathophysiology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, 450000, China
| | - Xiaojie Chen
- School of Basic Medicine, Henan University of Science and Technology, Luoyang, China
| | - Xuechao Jia
- Henan International Joint Laboratory of TCM Syndrome and Prescription in Signaling, Traditional Chinese Medicine (Zhong Jing) School, Henan University of Chinese Medicine, Zhengzhou, Henan, China.
| | - Zigang Dong
- Tianjian Laboratory of Advanced Biomedical Sciences, Academy of Medical Sciences, College of Medicine, Zhengzhou University, Zhengzhou, Henan, 450001, China.
- China-US (Henan) Hormel Cancer Institute, Zhengzhou, Henan, 450000, China.
- Department of Pathophysiology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, 450000, China.
| | - Kangdong Liu
- Tianjian Laboratory of Advanced Biomedical Sciences, Academy of Medical Sciences, College of Medicine, Zhengzhou University, Zhengzhou, Henan, 450001, China.
- Department of Pathophysiology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, 450000, China.
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Feng X, Wei G, Su Y, Xian Y, Liu Z, Gao Y, Liang J, Lian H, Xu J, Zhao J, Liu Q, Song F. Active fraction of Polyrhachis vicina (Rogers) inhibits osteoclastogenesis by targeting Trim38 mediated proteasomal degradation of TRAF6. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2024; 132:155890. [PMID: 39033726 DOI: 10.1016/j.phymed.2024.155890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 05/25/2024] [Accepted: 07/15/2024] [Indexed: 07/23/2024]
Abstract
BACKGROUND Reactive Oxygen Species (ROS) is a key factor in the pathogenesis of osteoporosis (OP) primarily characterized by excessive osteoclast activity. Active fraction of Polyrhachis vicina Rogers (AFPR) exerts antioxidant effects and possesses extensive promising therapeutic effects in various conditions, however, its function in osteoclastogenesis and OP is unknown. PURPOSE The aim of this study is to elucidate the cellular and molecular mechanisms of AFPR in OP. STUDY DESIGN AND METHODS CCK8 assay was used to evaluate the cell viability under AFPR treatment. TRAcP staining, podosome belts staining and bone resorption were used to test the effect of AFPR on osteoclastogenesis. Immunofluorescence staining was used to observe the effect of AFPR on ROS production. si-RNA transfection, coimmunoprecipitation and Western-blot were used to clarify the underlying mechanisms. Further, an ovariectomy (OVX) -induced OP mice model was used to identify the effect of AFPR on bone loss using Micro-CT scanning and histological examination. RESULTS In the present study, AFPR inhibited osteoclast differentiation and bone resorption induced by nuclear factor-κB receptor activator (NF-κB) ligand (RANKL) in dose-/ time-dependent with no cytotoxicity. Meanwhile, AFPR decreased RANKL-mediated ROS levels and enhanced ROS scavenging enzymes. Mechanistically, AFPR promoted proteasomal degradation of TRAF6 by significantly upregulating its K48-linked ubiquitination, subsequently inhibiting NFATc1 activity. We further observed that tripartite motif protein 38 (TRIM38) could mediate the ubiquitination of TRAF6 in response to RANKL. Moreover, TRIM38 could negatively regulate the RANKL pathway by binding to TRAF6 and promoting K48-linked polyubiquitination. In addition, TRIM38 deficiency rescued the inhibition of AFPR on ROS and NFATc1 activity and osteoclastogenesis. In line with these results, AFPR reduced OP caused by OVX through ameliorating osteoclastogenesis. CONCLUSION AFPR alleviates ovariectomized-induced bone loss via suppressing ROS and NFATc1 by targeting Trim38 mediated proteasomal degradation of TRAF6. The research offers innovative perspectives on AFPR's suppressive impact in vivo OVX mouse model and in vitro, and clarifies the fundamental mechanism.
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Affiliation(s)
- Xiaoliang Feng
- Guangxi Key Laboratory of Regenerative Medicine, Orthopaedics Trauma and Hand Surgery, the First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, PR China; Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application Co-constructed by the Province and Ministry, Guangxi Medical University, Nanning, Guangxi, PR China
| | - Guining Wei
- Department of Pharmacology, Guangxi Institute of Chinese Medicine and Pharmaceutical Science, Nanning, 530022, PR China
| | - Yuangang Su
- Guangxi Key Laboratory of Regenerative Medicine, Orthopaedics Trauma and Hand Surgery, the First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, PR China; Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application Co-constructed by the Province and Ministry, Guangxi Medical University, Nanning, Guangxi, PR China
| | - Yansi Xian
- Guangxi Key Laboratory of Regenerative Medicine, Orthopaedics Trauma and Hand Surgery, the First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, PR China; Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application Co-constructed by the Province and Ministry, Guangxi Medical University, Nanning, Guangxi, PR China
| | - Zhijuan Liu
- Guangxi Key Laboratory of Regenerative Medicine, Orthopaedics Trauma and Hand Surgery, the First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, PR China; Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application Co-constructed by the Province and Ministry, Guangxi Medical University, Nanning, Guangxi, PR China
| | - Yijie Gao
- Guangxi Key Laboratory of Regenerative Medicine, Orthopaedics Trauma and Hand Surgery, the First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, PR China; Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application Co-constructed by the Province and Ministry, Guangxi Medical University, Nanning, Guangxi, PR China
| | - Jiamin Liang
- Guangxi Key Laboratory of Regenerative Medicine, Orthopaedics Trauma and Hand Surgery, the First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, PR China; Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application Co-constructed by the Province and Ministry, Guangxi Medical University, Nanning, Guangxi, PR China
| | - Haoyu Lian
- Guangxi Key Laboratory of Regenerative Medicine, Orthopaedics Trauma and Hand Surgery, the First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, PR China; Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application Co-constructed by the Province and Ministry, Guangxi Medical University, Nanning, Guangxi, PR China
| | - Jiake Xu
- School of Biomedical Sciences, the University of Western Australia, Perth, Australia; Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, PR China
| | - Jinmin Zhao
- Guangxi Key Laboratory of Regenerative Medicine, Orthopaedics Trauma and Hand Surgery, the First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, PR China; Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application Co-constructed by the Province and Ministry, Guangxi Medical University, Nanning, Guangxi, PR China
| | - Qian Liu
- Guangxi Key Laboratory of Regenerative Medicine, Orthopaedics Trauma and Hand Surgery, the First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, PR China.
| | - Fangming Song
- Guangxi Key Laboratory of Regenerative Medicine, Orthopaedics Trauma and Hand Surgery, the First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, PR China; Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application Co-constructed by the Province and Ministry, Guangxi Medical University, Nanning, Guangxi, PR China.
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Sampson C, Wang Q, Otkur W, Zhao H, Lu Y, Liu X, Piao H. The roles of E3 ubiquitin ligases in cancer progression and targeted therapy. Clin Transl Med 2023; 13:e1204. [PMID: 36881608 PMCID: PMC9991012 DOI: 10.1002/ctm2.1204] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 02/07/2023] [Accepted: 02/13/2023] [Indexed: 03/08/2023] Open
Abstract
Ubiquitination is one of the most important post-translational modifications which plays a significant role in conserving the homeostasis of cellular proteins. In the ubiquitination process, ubiquitin is conjugated to target protein substrates for degradation, translocation or activation, dysregulation of which is linked to several diseases including various types of cancers. E3 ubiquitin ligases are regarded as the most influential ubiquitin enzyme owing to their ability to select, bind and recruit target substrates for ubiquitination. In particular, E3 ligases are pivotal in the cancer hallmarks pathways where they serve as tumour promoters or suppressors. The specificity of E3 ligases coupled with their implication in cancer hallmarks engendered the development of compounds that specifically target E3 ligases for cancer therapy. In this review, we highlight the role of E3 ligases in cancer hallmarks such as sustained proliferation via cell cycle progression, immune evasion and tumour promoting inflammation, and in the evasion of apoptosis. In addition, we summarise the application and the role of small compounds that target E3 ligases for cancer treatment along with the significance of targeting E3 ligases as potential cancer therapy.
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Affiliation(s)
- Chibuzo Sampson
- CAS Key Laboratory of Separation Science for Analytical ChemistryDalian Institute of Chemical PhysicsChinese Academy of SciencesDalianChina
- University of Chinese Academy of SciencesBeijingChina
| | - Qiuping Wang
- CAS Key Laboratory of Separation Science for Analytical ChemistryDalian Institute of Chemical PhysicsChinese Academy of SciencesDalianChina
| | - Wuxiyar Otkur
- CAS Key Laboratory of Separation Science for Analytical ChemistryDalian Institute of Chemical PhysicsChinese Academy of SciencesDalianChina
| | - Haifeng Zhao
- Department of OrthopedicsDalian Second People's HospitalDalianChina
| | - Yun Lu
- CAS Key Laboratory of Separation Science for Analytical ChemistryDalian Institute of Chemical PhysicsChinese Academy of SciencesDalianChina
- Department of StomatologyDalian Medical UniversityDalianChina
| | - Xiaolong Liu
- CAS Key Laboratory of Separation Science for Analytical ChemistryDalian Institute of Chemical PhysicsChinese Academy of SciencesDalianChina
| | - Hai‐long Piao
- CAS Key Laboratory of Separation Science for Analytical ChemistryDalian Institute of Chemical PhysicsChinese Academy of SciencesDalianChina
- University of Chinese Academy of SciencesBeijingChina
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5
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Wan P, Yang G, Zhang S, Zhang Y, Jia Y, Che X, Luo Z, Pan P, Li G, Chen X, Zhang Q, Zhang W, Tan Q, Li Y, Wu J. ASB17 Facilitates the Burst of LPS-Induced Inflammation Through Maintaining TRAF6 Stability. Front Cell Infect Microbiol 2022; 12:759077. [PMID: 35174103 PMCID: PMC8842666 DOI: 10.3389/fcimb.2022.759077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2021] [Accepted: 01/06/2022] [Indexed: 11/13/2022] Open
Abstract
ASB17, a member of the ankyrin repeat and SOCS box-containing protein (ASB) family, has been supposed to act as an E3 ubiquitin ligase. Actually, little is known about its biological function. In this study, we found that ASB17 knocking-out impaired the expression of the pro-inflammatory cytokines CCL2 and IL-6 in bone marrow-derived dendritic cells (BMDCs) stimulated by lipopolysaccharide (LPS), indicating an inflammation-promoting role of this gene. We reveal that ASB17 promotes LPS-induced nuclear factor kappa B (NF-κB) signal activation through interacting with TNF receptor-associated factor 6 (TRAF6) which is a crucial adaptor protein downstream of toll-like receptors (TLR). ASB17 via its aa177-250 segment interacts with the Zn finger domain of TRAF6. The interaction of ASB17 stabilizes TRAF6 protein through inhibiting K48-linked TRAF6 polyubiquitination. Therefore, we suggest that ASB17 facilitates LPS-induced NF-κB activation by maintaining TRAF6 protein stability. The inflammation enhancer role of ASB17 is recognized here, which provides new understanding of the activation process of inflammation and immune response.
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Affiliation(s)
- Pin Wan
- Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University, Guangzhou, China
| | - Ge Yang
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan, China
| | - Simeng Zhang
- Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University, Guangzhou, China
| | - Yaru Zhang
- Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University, Guangzhou, China
| | - Yaling Jia
- Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University, Guangzhou, China
| | - Xu Che
- Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University, Guangzhou, China
| | - Zhen Luo
- Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University, Guangzhou, China
- Foshan Institute of Medical Microbiology, Foshan, China
| | - Pan Pan
- The First Affiliated Hospital of Jinan University, Jinan University, Guangzhou, China
| | - Geng Li
- Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University, Guangzhou, China
- Foshan Institute of Medical Microbiology, Foshan, China
| | - Xulin Chen
- Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University, Guangzhou, China
- Foshan Institute of Medical Microbiology, Foshan, China
| | - Qiwei Zhang
- Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University, Guangzhou, China
- Foshan Institute of Medical Microbiology, Foshan, China
| | - Wen Zhang
- Guangdong Longfan Biological Science and Technology, Foshan, China
| | - Qiuping Tan
- Guangdong Longfan Biological Science and Technology, Foshan, China
| | - Yongkui Li
- Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University, Guangzhou, China
- Foshan Institute of Medical Microbiology, Foshan, China
| | - Jianguo Wu
- Guangdong Provincial Key Laboratory of Virology, Institute of Medical Microbiology, Jinan University, Guangzhou, China
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan, China
- Foshan Institute of Medical Microbiology, Foshan, China
- The First Affiliated Hospital of Jinan University, Jinan University, Guangzhou, China
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6
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Zhang W, Ma Z, Wu Y, Shi X, Zhang Y, Zhang M, Zhang M, Wang L, Liu W. SARS-CoV-2 3C-like protease antagonizes interferon-beta production by facilitating the degradation of IRF3. Cytokine 2021; 148:155697. [PMID: 34509038 PMCID: PMC8413301 DOI: 10.1016/j.cyto.2021.155697] [Citation(s) in RCA: 6] [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: 04/26/2021] [Revised: 08/30/2021] [Accepted: 08/31/2021] [Indexed: 12/18/2022]
Abstract
The prevalence of SARS-CoV-2 is a great threat to global public health. However, the relationship between the viral pathogen SARS-CoV-2 and host innate immunity has not yet been well studied. The genome of SARS-CoV-2 encodes a viral protease called 3C-like protease. This protease is responsible for cleaving viral polyproteins during replication. In this investigation, 293T cells were transfected with SARS-CoV-2 3CL and then infected with Sendai virus (SeV) to induce the RIG-I like receptor (RLR)-based immune pathway. q-PCR, luciferase reporter assays, and western blotting were used for experimental analyses. We found that SARS-CoV-2 3CL significantly downregulated IFN-β mRNA levels. Upon SeV infection, SARS-CoV-2 3CL inhibited the nuclear translocation of IRF3 and p65 and promoted the degradation of IRF3. This effect of SARS-CoV-2 3CL on type I IFN in the RLR immune pathway opens up novel ideas for future research on SARS-CoV-2.
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Affiliation(s)
- Wenwen Zhang
- College of Life Sciences, Henan Agricultural University, Zhengzhou 450002, China
| | - Zhenling Ma
- College of Life Sciences, Henan Agricultural University, Zhengzhou 450002, China
| | - Yaru Wu
- College of Life Sciences, Henan Agricultural University, Zhengzhou 450002, China
| | - Xixi Shi
- College of Life Sciences, Henan Agricultural University, Zhengzhou 450002, China
| | - Yanyan Zhang
- College of Life Sciences, Henan Agricultural University, Zhengzhou 450002, China
| | - Min Zhang
- College of Pharmacy, Henan University of Chinese Medicine, Zhengzhou 450046, China
| | - Menghao Zhang
- College of Life Sciences, Henan Agricultural University, Zhengzhou 450002, China
| | - Lei Wang
- College of Life Sciences, Henan Agricultural University, Zhengzhou 450002, China
| | - Wei Liu
- College of Life Sciences, Henan Agricultural University, Zhengzhou 450002, China.
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7
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Klimentova EA, Suchkov IA, Egorov AA, Kalinin RE. Apoptosis and Cell Proliferation Markers in Inflammatory-Fibroproliferative Diseases of the Vessel Wall (Review). Sovrem Tekhnologii Med 2021; 12:119-126. [PMID: 34795999 PMCID: PMC8596273 DOI: 10.17691/stm2020.12.4.13] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Indexed: 12/11/2022] Open
Abstract
Apoptosis is the main feature of inflammatory-fibroproliferative disorders of the vessel wall. Studies in animal models have shown that smooth muscle cells (SMCs) cultured from endarterectomy specimens from the affected area proliferate more slowly and display higher apoptotic indices than SMCs derived from the normal vessel wall. Apoptotic cells were found in the destabilized atherosclerotic plaques, as well as in the samples with restenosis of the reconstruction area. Injury to the vessel wall causes two waves of apoptosis. The first wave is the rapid apoptosis in the media that occurs within a few hours after injury and leads to a marked reduction in the number of vascular wall cells. The second wave of apoptosis occurs much later (from several days to weeks) and is limited by the SMCs within the developing neointima. Up to 14% of the neointimal SMCs undergo apoptosis 20 days after balloon angioplasty. Ligation of the external carotid artery in a rabbit model led to a marked decrease in blood flow in the common carotid artery, which correlated with the increased apoptosis of endothelial cells and SMCs. Angioplasty-induced death of SMCs is regulated by a redox-sensitive signaling pathway, and topical administration of antioxidants can minimize vascular cell loss. On the whole, studies show that apoptosis is prevalent in vascular lesions, controlling the viability of both inflammatory and vascular cells, determining the cellular composition of the vessel wall. The main markers of apoptosis (Fas, Fas ligand, p53, Bcl-2, Bax) and cell proliferation (toll receptor) have been considered in the current review.
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Affiliation(s)
- E A Klimentova
- Department of Cardiovascular, X-ray Endovascular, Operative Surgery, and Topographic Anatomy; Ryazan State Medical University, 9 Vysokovoltnaya St., Ryazan, 390026, Russia
| | - I A Suchkov
- Professor, Department of Cardiovascular, X-ray Endovascular, Operative Surgery, and Topographic Anatomy; Ryazan State Medical University, 9 Vysokovoltnaya St., Ryazan, 390026, Russia
| | - A A Egorov
- Doctoral Student, Department of Cardiovascular, X-ray Endovascular, Operative Surgery, and Topographic Anatomy; Ryazan State Medical University, 9 Vysokovoltnaya St., Ryazan, 390026, Russia
| | - R E Kalinin
- Professor, Head of the Department of Cardiovascular, X-ray Endovascular, Operative Surgery, and Topographic Anatomy Ryazan State Medical University, 9 Vysokovoltnaya St., Ryazan, 390026, Russia
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8
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TRAF6 Phosphorylation Prevents Its Autophagic Degradation and Re-Shapes LPS-Triggered Signaling Networks. Cancers (Basel) 2021; 13:cancers13143618. [PMID: 34298830 PMCID: PMC8303406 DOI: 10.3390/cancers13143618] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 07/07/2021] [Accepted: 07/13/2021] [Indexed: 11/20/2022] Open
Abstract
Simple Summary Here, we reveal that basal turnover and autophagy-induced decay of the ubiquitin E3 ligase TRAF6 is antagonized by IKKε-mediated phosphorylation at five serines. Phosphoproteomic experiments show that TRAF6 and its phosphorylation contribute to the remodeling of LPS- and autophagyinduced signaling networks, revealing an intricate link between inflammatory and metabolic processes that are frequently dysregulated in cancer. Abstract The ubiquitin E3 ligase TNF Receptor Associated Factor 6 (TRAF6) participates in a large number of different biological processes including innate immunity, differentiation and cell survival, raising the need to specify and shape the signaling output. Here, we identify a lipopolysaccharide (LPS)-dependent increase in TRAF6 association with the kinase IKKε (inhibitor of NF-κB kinase subunit ε) and IKKε-mediated TRAF6 phosphorylation at five residues. The reconstitution of TRAF6-deficient cells, with TRAF6 mutants representing phosphorylation-defective or phospho-mimetic TRAF6 variants, showed that the phospho-mimetic TRAF6 variant was largely protected from basal ubiquitin/proteasome-mediated degradation, and also from autophagy-mediated decay in autolysosomes induced by metabolic perturbation. In addition, phosphorylation of TRAF6 and its E3 ligase function differentially shape basal and LPS-triggered signaling networks, as revealed by phosphoproteome analysis. Changes in LPS-triggered phosphorylation networks of cells that had experienced autophagy are partially dependent on TRAF6 and its phosphorylation status, suggesting an involvement of this E3 ligase in the interplay between metabolic and inflammatory circuits.
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9
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Song G, Zhang Y, Tian J, Ma J, Yin K, Xu H, Wang S. TRAF6 Regulates the Immunosuppressive Effects of Myeloid-Derived Suppressor Cells in Tumor-Bearing Host. Front Immunol 2021; 12:649020. [PMID: 33717204 PMCID: PMC7946975 DOI: 10.3389/fimmu.2021.649020] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2021] [Accepted: 02/04/2021] [Indexed: 12/12/2022] Open
Abstract
Myeloid-derived suppressor cells (MDSCs) are immature heterogeneous cells derived from the bone marrow and they are the major component of the tumor-induced immunosuppressive environment. Tumor necrosis factor receptor-associated factor 6 (TRAF6), an E3 ubiquitin ligase, catalyzes the polyubiquitination of target proteins. TRAF6 plays a critical role in modulating the immune system. However, whether TRAF6 is involved in the regulation of MDSCs has not been thoroughly elucidated to date. In this study, we found that the expression of TRAF6 in MDSCs derived from tumor tissue was significantly upregulated compared with that of MDSCs from spleen of tumor-bearing mice. Knockdown of TRAF6 remarkably attenuated the immunosuppressive effects of MDSCs. Mechanistically, TRAF6 might improve the immunosuppression of MDSCs by mediating K63-linked polyubiquitination and phosphorylation of signal transducer and activator of transcription 3 (STAT3). Additionally, it was discovered that the accumulation of MDSCs was abnormal in peripheral blood of lung cancer patients. TRAF6 and arginase 1 were highly expressed in MDSCs of patients with lung cancer. Taken together, our study demonstrated that TRAF6 participates in promoting the immunosuppressive function of MDSCs and provided a potential target for antitumor immunotherapy.
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Affiliation(s)
- Ge Song
- Department of Laboratory Medicine, Affiliated People's Hospital, Jiangsu University, Zhenjiang, China
- Institute of Laboratory Medicine, Jiangsu Key Laboratory for Laboratory Medicine, Jiangsu University School of Medicine, Zhenjiang, China
| | - Yue Zhang
- Department of Laboratory Medicine, Affiliated People's Hospital, Jiangsu University, Zhenjiang, China
| | - Jie Tian
- Institute of Laboratory Medicine, Jiangsu Key Laboratory for Laboratory Medicine, Jiangsu University School of Medicine, Zhenjiang, China
| | - Jie Ma
- Institute of Laboratory Medicine, Jiangsu Key Laboratory for Laboratory Medicine, Jiangsu University School of Medicine, Zhenjiang, China
| | - Kai Yin
- Department of General Surgery, Affiliated Hospital of Jiangsu University, Zhenjiang, China
| | - Huaxi Xu
- Institute of Laboratory Medicine, Jiangsu Key Laboratory for Laboratory Medicine, Jiangsu University School of Medicine, Zhenjiang, China
| | - Shengjun Wang
- Department of Laboratory Medicine, Affiliated People's Hospital, Jiangsu University, Zhenjiang, China
- Institute of Laboratory Medicine, Jiangsu Key Laboratory for Laboratory Medicine, Jiangsu University School of Medicine, Zhenjiang, China
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10
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Wang ZH, Ke F, Zhang QY, Gui JF. Structural and Functional Diversity among Five RING Finger Proteins from Carassius Auratus Herpesvirus (CaHV). Viruses 2021; 13:v13020254. [PMID: 33562288 PMCID: PMC7914681 DOI: 10.3390/v13020254] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 01/28/2021] [Accepted: 02/03/2021] [Indexed: 12/17/2022] Open
Abstract
Carassius auratus herpesvirus (CaHV) has been identified as a high-virulence pathogenic virus that infects aquatic animals, but the key factor for virus–host interaction is still unclear. Five Really interesting new genes (RING) finger proteins (39L, 52L, 131R, 136L, and 143R) of CaHV were screened to determine structural diversity. RING finger proteins were also predicted in other known fish herpesviruses, with an arrangement and number similar to CaHV. We performed multifaceted analyses of the proteins, including protein sizes, skeleton structures, subcellular localizations, and ubiquitination activities, to determine their precise roles in virus–host interactions. The five proteins were overexpressed and detected different levels of ubiquitination activities, and 143R showed the highest activity. Then, the prokaryotic expressed and purified full-length proteins (131R and 136L), RING domain isolates (131R12–43 and 136L45–87), and RING domain-deleted mutants (131RΔ12–43 and 136LΔ45–87) were prepared to detect their activities through ubiquitination assays. The results indicate that both full-length proteins and their isolates have activities that catalyze ubiquitination, and the full-length proteins possess higher activity than the isolates, but RING domain-deleted mutants lose their activities. Furthermore, the activities of the five proteins were verified as E3 ubiquitin ligase activity, showing that the RING domains determine the ubiquitination activity. These proteins present different subcellular localization. RING domain-deleted mutants showed similar subcellular localization with their full-length proteins, and all the isolates diffused in whole cells. The current results indicate that the sequence outside the RING domain determines subcellular localization and the level of ubiquitination activity, suggesting that the RING finger proteins of fish herpesviruses might have diverse functions in virus–host interaction.
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Affiliation(s)
- Zi-Hao Wang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; (Z.-H.W.); (F.K.)
- College of Modern Agriculture Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
- The Innovation Academy of Seed Design, Chinese Academy of Sciences, Beijing 100101, China
| | - Fei Ke
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; (Z.-H.W.); (F.K.)
- College of Modern Agriculture Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qi-Ya Zhang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; (Z.-H.W.); (F.K.)
- College of Modern Agriculture Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
- The Innovation Academy of Seed Design, Chinese Academy of Sciences, Beijing 100101, China
- Correspondence: (Q.-Y.Z.); (J.-F.G.); Tel.: +86-027-68780792 (Q.-Y.Z.); +86-027-68780707 (J.-F.G.)
| | - Jian-Fang Gui
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; (Z.-H.W.); (F.K.)
- College of Modern Agriculture Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
- The Innovation Academy of Seed Design, Chinese Academy of Sciences, Beijing 100101, China
- Correspondence: (Q.-Y.Z.); (J.-F.G.); Tel.: +86-027-68780792 (Q.-Y.Z.); +86-027-68780707 (J.-F.G.)
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11
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Di Q, Zhao X, Zhang R, Ma X, Liang X, Li X, Gao J, Tang H, Chen W, Xiao W. Novel clerodane-type diterpenoid Cintelactone A suppresses lipopolysaccharide -induced inflammation by promoting ubiquitination, proteasomal degradation of TRAF6. Pharmacol Res 2021; 164:105386. [PMID: 33352228 DOI: 10.1016/j.phrs.2020.105386] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 12/13/2020] [Accepted: 12/14/2020] [Indexed: 12/29/2022]
Abstract
Cellular inflammation is the underlying cause of several diseases and development of a safe and effective anti-inflammatory drug is need-of-the hour for treatment of diseases like lung inflammation. Callicarpa integerrima Champ. is a well-known herbal medicine with hemostatic and anti-inflammatory functions. However, the exact ingredient exhibiting anti-inflammatory activity in C. integerrima Champ. is largely unknown. Here, we first isolated, purified and characterized a novel clerodane-type diterpenoid Cintelactone A (CA) from C. integerrima Champ. We demonstrated that CA could significantly inhibit lipopolysaccharide (LPS)-induced pro-inflammatory cytokines and mediators production both in mouse peritoneal macrophages and THP1 cells. Consistently, CA also relieved inflammation and reduced LPS-induced lung injury in mice. We systematically elucidated the mechanism of action as well. CA interacted with Arg78 of tumor necrosis factor receptor-associated factor 6 (TRAF6) by hydrogen bonding. It further promoted the K48-linked ubiquitination and proteasomal degradation of TRAF6, and suppressed the activation of NF-κB and MAPKs signaling pathways. Collectively, our study reveals that new clerodane-type diterpenoid CA suppresses LPS-induced inflammation by promoting TRAF6 degradation, suggesting that CA as the potential therapeutic candidate for the treatment of inflammation associated diseases.
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Affiliation(s)
- Qianqian Di
- Guangdong Provincial Key Laboratory of Regional Immunity and Diseases, Department of Immunology, Shenzhen University School of Medicine, Shenzhen, 518060, China
| | - Xibao Zhao
- Guangdong Provincial Key Laboratory of Regional Immunity and Diseases, Department of Immunology, Shenzhen University School of Medicine, Shenzhen, 518060, China
| | - Ruihan Zhang
- Key Laboratory of Medicinal Chemistry for Natural Resource of Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, China
| | - Xingyu Ma
- Guangdong Provincial Key Laboratory of Regional Immunity and Diseases, Department of Immunology, Shenzhen University School of Medicine, Shenzhen, 518060, China
| | - Xinxin Liang
- Key Laboratory of Medicinal Chemistry for Natural Resource of Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, China
| | - Xiaoli Li
- Key Laboratory of Medicinal Chemistry for Natural Resource of Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, China
| | - Junbo Gao
- Key Laboratory of Medicinal Chemistry for Natural Resource of Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, China
| | - Haimei Tang
- Guangdong Provincial Key Laboratory of Regional Immunity and Diseases, Department of Immunology, Shenzhen University School of Medicine, Shenzhen, 518060, China
| | - Weilin Chen
- Guangdong Provincial Key Laboratory of Regional Immunity and Diseases, Department of Immunology, Shenzhen University School of Medicine, Shenzhen, 518060, China.
| | - Weilie Xiao
- Key Laboratory of Medicinal Chemistry for Natural Resource of Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, China.
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12
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Cho E, Chen Z, Ding M, Seong J, Lee S, Min SH, Choi DK, Lee TH. PMSA prevents osteoclastogenesis and estrogen-dependent bone loss in mice. Bone 2021; 142:115707. [PMID: 33141068 DOI: 10.1016/j.bone.2020.115707] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 10/12/2020] [Accepted: 10/20/2020] [Indexed: 01/07/2023]
Abstract
Excessive bone resorption mediated by mature osteoclasts can cause osteoporosis, leading to fragility fractures. Therefore, an effective therapeutic strategy for anti-osteoporosis drugs is the reduction of osteoclast activity. In this study, the osteoclast inhibitory activity of a novel compound, N-phenyl-methylsulfonamido-acetamide (PMSA), was examined. PMSA treatment inhibited receptor activator of nuclear factor kappa B ligand (RNAKL)-induced osteoclast differentiation in bone marrow-derived macrophage cells (BMMs). We investigated two PMSAs, N-2-(3-acetylphenyl)-N-2-(methylsulfonyl)-N-1-[2-(phenylthio)phenyl] glycinamide (PMSA-3-Ac), and N-2-(5-chloro-2-methoxyphenyl)-N-2-(methylsulfonyl)-N-1-[2-(phenylthio)phenyl]glycinamide (PMSA-5-Cl), to determine their effects on osteoclast differentiation. PMSAs inhibited the signaling pathways at the early stage. PMSA-3-Ac inhibited tumor necrosis factor receptor-associated factor 6 (TRAF6) expression, whereas PMSA-5-Cl suppressed the mitogen-activated protein kinase (MAPK) signaling pathways. However, both PMSAs inhibited the master transcription factor, nuclear factor of activated T cell cytoplasmic-1 (NFATc1), by blocking nuclear localization. An in vivo study of PMSAs was performed in an ovariectomized (OVX) mouse model, and PMSA-5-Cl prevented bone loss in OVX mice. Therefore, our results suggested that PMSAs, specifically PMSA-5-Cl, may serve as a potential therapeutic agent for postmenopausal osteoporosis.
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Affiliation(s)
- Eunjin Cho
- Department of Oral Biochemistry, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Zhihao Chen
- Department of Molecular Medicine (BK21plus), Chonnam National University Graduate School, Gwangju 61186, Republic of Korea
| | - Mina Ding
- Department of Molecular Medicine (BK21plus), Chonnam National University Graduate School, Gwangju 61186, Republic of Korea
| | - Jihyoun Seong
- Department of Oral Biochemistry, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Sunwoo Lee
- Department of Chemistry, Chonnam National University, Gwangju 61186, Republic of Korea.
| | - Sang Hyun Min
- New Drug Development Center, DGMIF, 80 Chumbok-ro, Dong-gu, Daegu 41061, Republic of Korea.
| | - Dong Kyu Choi
- New Drug Development Center, DGMIF, 80 Chumbok-ro, Dong-gu, Daegu 41061, Republic of Korea.
| | - Tae-Hoon Lee
- Department of Oral Biochemistry, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju 61186, Republic of Korea; Department of Molecular Medicine (BK21plus), Chonnam National University Graduate School, Gwangju 61186, Republic of Korea.
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13
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Zong Z, Zhang Z, Wu L, Zhang L, Zhou F. The Functional Deubiquitinating Enzymes in Control of Innate Antiviral Immunity. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:2002484. [PMID: 33511009 PMCID: PMC7816709 DOI: 10.1002/advs.202002484] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 09/09/2020] [Indexed: 05/11/2023]
Abstract
Innate antiviral immunity is the first line of host defense against invading viral pathogens. Immunity activation primarily relies on the recognition of pathogen-associated molecular patterns (PAMPs) by pattern recognition receptors (PRRs). Viral proteins or nucleic acids mainly engage three classes of PRRs: Toll-like receptors (TLRs), retinoic acid-inducible gene I (RIG-I)-like receptors (RLRs), and DNA sensor cyclic GMP-AMP (cGAMP) synthase (cGAS). These receptors initiate a series of signaling cascades that lead to the production of proinflammatory cytokines and type I interferon (IFN-I) in response to viral infection. This system requires precise regulation to avoid aberrant activation. Emerging evidence has unveiled the crucial roles that the ubiquitin system, especially deubiquitinating enzymes (DUBs), play in controlling immune responses. In this review, an overview of the most current findings on the function of DUBs in the innate antiviral immune pathways is provided. Insights into the role of viral DUBs in counteracting host immune responses are also provided. Furthermore, the prospects and challenges of utilizing DUBs as therapeutic targets for infectious diseases are discussed.
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Affiliation(s)
- Zhi Zong
- Department of Hepatobiliary and Pancreatic SurgeryThe First Affiliated HospitalZhejiang University School of MedicineHangzhou310003P. R. China
- MOE Key Laboratory of Biosystems Homeostasis & Protection and Innovation Center for Cell Signaling NetworkLife Sciences InstituteZhejiang UniversityHangzhou310058P. R. China
| | - Zhengkui Zhang
- Institute of Biology and Medical ScienceSoochow UniversitySuzhou215123P. R. China
| | - Liming Wu
- Department of Hepatobiliary and Pancreatic SurgeryThe First Affiliated HospitalZhejiang University School of MedicineHangzhou310003P. R. China
| | - Long Zhang
- Department of Hepatobiliary and Pancreatic SurgeryThe First Affiliated HospitalZhejiang University School of MedicineHangzhou310003P. R. China
- MOE Key Laboratory of Biosystems Homeostasis & Protection and Innovation Center for Cell Signaling NetworkLife Sciences InstituteZhejiang UniversityHangzhou310058P. R. China
| | - Fangfang Zhou
- Institute of Biology and Medical ScienceSoochow UniversitySuzhou215123P. R. China
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14
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Ubiquitination modification: critical regulation of IRF family stability and activity. SCIENCE CHINA-LIFE SCIENCES 2020; 64:957-965. [PMID: 33141302 PMCID: PMC7607542 DOI: 10.1007/s11427-020-1796-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Accepted: 08/11/2020] [Indexed: 11/09/2022]
Abstract
Interferon regulatory factors (IRFs) play pivotal and critical roles in innate and adaptive immune responses; thus, precise and stringent regulation of the stability and activation of IRFs in physiological processes is necessary. The stability and activities of IRFs are directly or indirectly targeted by endogenous and exogenous proteins in an ubiquitin-dependent manner. However, few reviews have summarized how host E3 ligases/DUBs or viral proteins regulate IRF stability and activity. Additionally, with recent technological developments, details about the ubiquitination of IRFs have been continuously revealed. As knowledge of how these proteins function and interact with IRFs may facilitate a better understanding of the regulation of IRFs in immune responses or other biological processes, we summarized current studies on the direct ubiquitination of IRFs, with an emphasis on how these proteins interact with IRFs and affect their activities, which may provide exciting targets for drug development by regulating the functions of specific E3 ligases.
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