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Zhang X, Li Z, Peng Q, Liu C, Wu Y, Wen Y, Zheng R, Xu C, Tian J, Zheng X, Yan Q, Wang J, Ma J. Epstein-Barr virus suppresses N 6-methyladenosine modification of TLR9 to promote immune evasion. J Biol Chem 2024; 300:107226. [PMID: 38537697 PMCID: PMC11061751 DOI: 10.1016/j.jbc.2024.107226] [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: 02/21/2024] [Revised: 03/08/2024] [Accepted: 03/17/2024] [Indexed: 04/26/2024] Open
Abstract
Epstein-Barr virus (EBV) is a human tumor virus associated with a variety of malignancies, including nasopharyngeal carcinoma, gastric cancers, and B-cell lymphomas. N6-methyladenosine (m6A) modifications modulate a wide range of cellular processes and participate in the regulation of virus-host cell interactions. Here, we discovered that EBV infection downregulates toll-like receptor 9 (TLR9) m6A modification levels and thus inhibits TLR9 expression. TLR9 has multiple m6A modification sites. Knockdown of METTL3, an m6A "writer", decreases TLR9 protein expression by inhibiting its mRNA stability. Mechanistically, Epstein-Barr nuclear antigen 1 increases METTL3 protein degradation via K48-linked ubiquitin-proteasome pathway. Additionally, YTHDF1 was identified as an m6A "reader" of TLR9, enhancing TLR9 expression by promoting mRNA translation in an m6A -dependent manner, which suggests that EBV inhibits TLR9 translation by "hijacking" host m6A modification mechanism. Using the METTL3 inhibitor STM2457 inhibits TLR9-induced B cell proliferation and immunoglobulin secretion, and opposes TLR9-induced immune responses to assist tumor cell immune escape. In clinical lymphoma samples, the expression of METTL3, YTHDF1, and TLR9 was highly correlated with immune cells infiltration. This study reveals a novel mechanism that EBV represses the important innate immunity molecule TLR9 through modulating the host m6A modification system.
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Affiliation(s)
- Xiaoyue Zhang
- Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China; Cancer Research Institute, School of Basic Medical Science, Central South University, Changsha, Hunan, China; NHC Key Laboratory of Carcinogenesis, Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education, Hunan Key Laboratory of Nonresolving Inflammation and Cancer, Hunan Key Laboratory of Cancer Metabolism, Changsha, Hunan, China
| | - Zhengshuo Li
- Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China; Cancer Research Institute, School of Basic Medical Science, Central South University, Changsha, Hunan, China; NHC Key Laboratory of Carcinogenesis, Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education, Hunan Key Laboratory of Nonresolving Inflammation and Cancer, Hunan Key Laboratory of Cancer Metabolism, Changsha, Hunan, China
| | - Qiu Peng
- Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China; Cancer Research Institute, School of Basic Medical Science, Central South University, Changsha, Hunan, China; NHC Key Laboratory of Carcinogenesis, Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education, Hunan Key Laboratory of Nonresolving Inflammation and Cancer, Hunan Key Laboratory of Cancer Metabolism, Changsha, Hunan, China
| | - Can Liu
- Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China; Cancer Research Institute, School of Basic Medical Science, Central South University, Changsha, Hunan, China; NHC Key Laboratory of Carcinogenesis, Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education, Hunan Key Laboratory of Nonresolving Inflammation and Cancer, Hunan Key Laboratory of Cancer Metabolism, Changsha, Hunan, China
| | - Yangge Wu
- Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China; Cancer Research Institute, School of Basic Medical Science, Central South University, Changsha, Hunan, China; NHC Key Laboratory of Carcinogenesis, Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education, Hunan Key Laboratory of Nonresolving Inflammation and Cancer, Hunan Key Laboratory of Cancer Metabolism, Changsha, Hunan, China
| | - Yuqing Wen
- Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China; Cancer Research Institute, School of Basic Medical Science, Central South University, Changsha, Hunan, China; NHC Key Laboratory of Carcinogenesis, Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education, Hunan Key Laboratory of Nonresolving Inflammation and Cancer, Hunan Key Laboratory of Cancer Metabolism, Changsha, Hunan, China
| | - Run Zheng
- Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China; Cancer Research Institute, School of Basic Medical Science, Central South University, Changsha, Hunan, China; NHC Key Laboratory of Carcinogenesis, Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education, Hunan Key Laboratory of Nonresolving Inflammation and Cancer, Hunan Key Laboratory of Cancer Metabolism, Changsha, Hunan, China
| | - Chenxiao Xu
- Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China; Cancer Research Institute, School of Basic Medical Science, Central South University, Changsha, Hunan, China; NHC Key Laboratory of Carcinogenesis, Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education, Hunan Key Laboratory of Nonresolving Inflammation and Cancer, Hunan Key Laboratory of Cancer Metabolism, Changsha, Hunan, China
| | - Junrui Tian
- Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China; Cancer Research Institute, School of Basic Medical Science, Central South University, Changsha, Hunan, China; NHC Key Laboratory of Carcinogenesis, Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education, Hunan Key Laboratory of Nonresolving Inflammation and Cancer, Hunan Key Laboratory of Cancer Metabolism, Changsha, Hunan, China
| | - Xiang Zheng
- Department of Pathology, Affiliated Hospital of Guilin Medical University, Guilin, Guangxi, China
| | - Qun Yan
- Department of Clinical Laboratory, Xiangya Hospital, Central South University, Changsha, China
| | - Jia Wang
- Department of Immunology, Changzhi Medical College, Changzhi, Shanxi, China.
| | - Jian Ma
- Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China; Cancer Research Institute, School of Basic Medical Science, Central South University, Changsha, Hunan, China; NHC Key Laboratory of Carcinogenesis, Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education, Hunan Key Laboratory of Nonresolving Inflammation and Cancer, Hunan Key Laboratory of Cancer Metabolism, Changsha, Hunan, China.
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Shehab M, Hussein H, Fadlallah S, Rahal EA. An IL-17A-centric response to Epstein-Barr virus DNA mediated by dendritic Cell-T cell interactions. Front Mol Biosci 2024; 11:1243366. [PMID: 38638687 PMCID: PMC11024278 DOI: 10.3389/fmolb.2024.1243366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Accepted: 03/20/2024] [Indexed: 04/20/2024] Open
Abstract
Introduction: The Epstein-Barr virus has been associated with a considerable number of autoimmune diseases. We have previously demonstrated that EBV DNA enhances the production of IL-17A, a pro-inflammatory cytokine, via endosomal Toll-like receptor signalling. Methods: We used RNA-seq to analyze the transcriptional profile of mouse immune cells treated with EBV DNA. Results: We observed that EBV DNA upregulates an IL-17A-centric network of mediators. Ensemble Gene Set Enrichment Analysis (EGSEA) showed enriched expression of sets involved in inflammatory responses including IFNγ and TNF-α-associated pathways as well as proinflammatory diseases. On the other hand, while macrophages and B cells were somewhat able to induce an IL-17A response from T cells to EBV DNA, they were less potent than dendritic cells. EBV virions were also capable of eliciting the production of inflammatory mediators from dendritic cell-T cell cultures largely mirroring responses to the viral DNA. Conclusions: Given the wide prevalence of EBV in the population, our analyses reveal a network of mediators and cell types that may serve as therapeutic targets in a large proportion of people affected by autoimmune diseases.
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Affiliation(s)
- Marwa Shehab
- Department of Experimental Pathology, Immunology and Microbiology, American University of Beirut, Beirut, Lebanon
| | - Hadi Hussein
- Department of Experimental Pathology, Immunology and Microbiology, American University of Beirut, Beirut, Lebanon
- Center for Infectious Diseases Research, American University of Beirut, Beirut, Lebanon
| | - Sukayna Fadlallah
- Department of Experimental Pathology, Immunology and Microbiology, American University of Beirut, Beirut, Lebanon
- Center for Infectious Diseases Research, American University of Beirut, Beirut, Lebanon
| | - Elias A. Rahal
- Department of Experimental Pathology, Immunology and Microbiology, American University of Beirut, Beirut, Lebanon
- Center for Infectious Diseases Research, American University of Beirut, Beirut, Lebanon
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Kanai K, Kageyama S, Yoshie O. Involvement of TLR4 in Acute Hepatitis Associated with Airway Infection of Murine γ-Herpesvirus 68. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2023; 211:1550-1560. [PMID: 37772812 DOI: 10.4049/jimmunol.2200653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 09/11/2023] [Indexed: 09/30/2023]
Abstract
Extrahepatic viral infections are often accompanied by acute hepatitis, as evidenced by elevated serum liver enzymes and intrasinusoidal infiltration of CD8+ T cells, without direct infection of the liver. An example is infectious mononucleosis caused by primary infection with EBV. Previously, we demonstrated that airway infection of mice with murine γ-herpesvirus 68 (MHV68), a murine model of EBV, caused liver inflammation with elevated serum liver enzymes and intrahepatic infiltration of IFN-γ-producing CD8+ T cells and NK cells. Mechanistically, the expression of the CXCR3-ligand chemokines, which are commonly induced by IFN-γ and attract IFN-γ-producing Th1-type cells via CXCR3, was upregulated in the liver. Importantly, the liver inflammation was suppressed by oral neomycin, an intestine-impermeable aminoglycoside, suggesting an involvement of some products from the intestinal microbiota. In this study, we showed that the liver inflammation and the expression of the CXCR3-ligand chemokines in the liver were effectively ameliorated by i.p. administration of anti-TLR4 mAb or C34, a TLR4 blocker, as well as in TLR4-deficient mice. Conversely, intrarectal inoculation of Escherichia coli as an extraintestinal source of LPS aggravated liver inflammation in MHV68-infected mice with increased expression of the CXCR3-ligand chemokines in the liver. In contrast, the lung inflammation in MHV68-infected mice was not affected by oral neomycin, i.p. administration of C34, or TLR4 deficiency. Collectively, the LPS-TLR4 pathway plays a pivotal role in the liver inflammation of MHV68-infected mice at least in part by upregulating the CXCR3-ligand chemokines in the liver.
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Affiliation(s)
- Kyosuke Kanai
- Division of Virology, Department of Microbiology and Immunology, Faculty of Medicine, Tottori University, Yonago, Tottori, Japan
| | - Seiji Kageyama
- Division of Virology, Department of Microbiology and Immunology, Faculty of Medicine, Tottori University, Yonago, Tottori, Japan
| | - Osamu Yoshie
- Health and Kampo Institute, Sendai, Miyagi, Japan
- Aoinosono Sendai Izumi Long-Term Health Care Facility, Sendai, Miyagi, Japan
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Huang W, Bai L, Tang H. Epstein-Barr virus infection: the micro and macro worlds. Virol J 2023; 20:220. [PMID: 37784180 PMCID: PMC10546641 DOI: 10.1186/s12985-023-02187-9] [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: 07/19/2023] [Accepted: 09/19/2023] [Indexed: 10/04/2023] Open
Abstract
Epstein‒Barr virus (EBV) is a DNA virus that belongs to the human B lymphotropic herpesvirus family and is highly prevalent in the human population. Once infected, a host can experience latent infection because EBV evades the immune system, leading to hosts harboring the virus for their lifetime. EBV is associated with many diseases and causes significant challenges to human health. This review first offers a description of the natural history of EBV infection, clarifies the interaction between EBV and the immune system, and finally focuses on several major types of diseases caused by EBV infection.
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Affiliation(s)
- Wei Huang
- Center of Infectious Diseases, West China Hospital of Sichuan University, Chengdu, 610041, China
- Division of Infectious Diseases, State Key Laboratory of Biotherapy and Center of Infectious Diseases, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Lang Bai
- Center of Infectious Diseases, West China Hospital of Sichuan University, Chengdu, 610041, China.
- Division of Infectious Diseases, State Key Laboratory of Biotherapy and Center of Infectious Diseases, West China Hospital, Sichuan University, Chengdu, 610041, China.
| | - Hong Tang
- Center of Infectious Diseases, West China Hospital of Sichuan University, Chengdu, 610041, China.
- Division of Infectious Diseases, State Key Laboratory of Biotherapy and Center of Infectious Diseases, West China Hospital, Sichuan University, Chengdu, 610041, China.
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5
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Izadi S, Najfizadeh SR, Nejati A, TeimooriRad M, Shahmahmoodi S, Shirazi FG, Shokri F, Marashi SM. Potential role of EBV and Toll-like receptor 9 ligand in patients with systemic lupus erythematosus. Immunol Res 2023; 71:698-708. [PMID: 37097524 DOI: 10.1007/s12026-023-09380-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Accepted: 04/01/2023] [Indexed: 04/26/2023]
Abstract
SLE is a multisystem autoimmune disease characterized by multiple immunological abnormalities including production of autoantibodies. While the etiology of SLE is largely unknown, it is generally accepted that both genetic and environmental factors contribute to disease risk and immune dysregulation. Production of IFN-α is important for protecting the host against infections; however, over stimulation of innate immune pathways can induce autoimmune disease. Environmental factors, particularly Epstein-Barr virus (EBV), have been proposed to play an important role in SLE disease. Improper engagement of Toll-like receptor (TLR) pathways by endogenous or exogenous ligands may lead to the initiation of autoimmune responses and tissue injury. EBV is shown to be a potent stimulant of IFN-α by TLR signaling cascades. Given the highlighted role of IFN-α in SLE pathogenesis and potential role of EBV infection in this disease, the present study is aimed at exploring the in vitro effects of EBV infection and CPG (either alone or in combination) on IFN-α. We also examined the expression level of CD20 and BDCA-4 and CD123 in PBMCs in 32 SLE patients and 32 healthy controls. Our results showed PBMCs treated with CPG-induced higher levels of IFN-α and TLR-9 gene expression fold change compared to cells treated with either EBV or EBV-CPG. Moreover, PBMCs treated with CPG produced significantly higher IFN-α concentration in supernatant compared to cells treated with EBV but not EBV-CPG. Our results further highlight the potential role of EBV infection and TLRs in SLE patients although more studies are warranted to ascertain the global imprint that EBV infection can have on immune signature in patients with SLE.
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Affiliation(s)
- Shima Izadi
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, 14155, Iran
| | - Sayed Reza Najfizadeh
- Rheumatology Research Center, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Ahmad Nejati
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, 14155, Iran
| | - Majid TeimooriRad
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, 14155, Iran
| | - Shohreh Shahmahmoodi
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, 14155, Iran
| | - Frough Golsaz Shirazi
- Department of Immunology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Fazel Shokri
- Department of Immunology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Sayed Mahdi Marashi
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, 14155, Iran.
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6
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Panzer B, Kopp CW, Neumayer C, Koppensteiner R, Jozkowicz A, Poledniczek M, Gremmel T, Jilma B, Wadowski PP. Toll-like Receptors as Pro-Thrombotic Drivers in Viral Infections: A Narrative Review. Cells 2023; 12:1865. [PMID: 37508529 PMCID: PMC10377790 DOI: 10.3390/cells12141865] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 07/12/2023] [Accepted: 07/14/2023] [Indexed: 07/30/2023] Open
Abstract
Toll-like receptors (TLRs) have a critical role in the pathogenesis and disease course of viral infections. The induced pro-inflammatory responses result in the disturbance of the endovascular surface layer and impair vascular homeostasis. The injury of the vessel wall further promotes pro-thrombotic and pro-coagulatory processes, eventually leading to micro-vessel plugging and tissue necrosis. Moreover, TLRs have a direct role in the sensing of viruses and platelet activation. TLR-mediated upregulation of von Willebrand factor release and neutrophil, as well as macrophage extra-cellular trap formation, further contribute to (micro-) thrombotic processes during inflammation. The following review focuses on TLR signaling pathways of TLRs expressed in humans provoking pro-thrombotic responses, which determine patient outcome during viral infections, especially in those with cardiovascular diseases.
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Affiliation(s)
- Benjamin Panzer
- Department of Cardiology, Wilhelminenspital, 1090 Vienna, Austria
| | - Christoph W Kopp
- Division of Angiology, Department of Internal Medicine II, Medical University of Vienna, 1090 Vienna, Austria
| | - Christoph Neumayer
- Division of Vascular Surgery, Department of Surgery, Medical University of Vienna, 1090 Vienna, Austria
| | - Renate Koppensteiner
- Division of Angiology, Department of Internal Medicine II, Medical University of Vienna, 1090 Vienna, Austria
| | - Alicja Jozkowicz
- Faculty of Biophysics, Biochemistry and Biotechnology, Department of Medical Biotechnology, Jagiellonian University, 30-387 Krakow, Poland
| | - Michael Poledniczek
- Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna, 1090 Vienna, Austria
| | - Thomas Gremmel
- Institute of Cardiovascular Pharmacotherapy and Interventional Cardiology, Karl Landsteiner Society, 3100 St. Pölten, Austria
- Department of Internal Medicine I, Cardiology and Intensive Care Medicine, Landesklinikum Mistelbach-Gänserndorf, 2130 Mistelbach, Austria
| | - Bernd Jilma
- Department of Clinical Pharmacology, Medical University of Vienna, 1090 Vienna, Austria
| | - Patricia P Wadowski
- Division of Angiology, Department of Internal Medicine II, Medical University of Vienna, 1090 Vienna, Austria
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7
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Yao Y, Kong W, Yang L, Ding Y, Cui H. Immunity and Immune Evasion Mechanisms of Epstein-Barr Virus. Viral Immunol 2023; 36:303-317. [PMID: 37285188 DOI: 10.1089/vim.2022.0200] [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] [Indexed: 06/08/2023] Open
Abstract
Epstein-Barr virus (EBV) is the first human oncogenic virus to be identified, which evades the body's immune surveillance through multiple mechanisms that allow long-term latent infection. Under certain pathological conditions, EBVs undergo a transition from the latent phase to the lytic phase and cause targeted dysregulation of the host immune system, leading to the development of EBV-related diseases. Therefore, an in-depth understanding of the mechanism of developing an immune response to EBV and the evasion of immune recognition by EBV is important for the understanding of the pathogenesis of EBV, which is of great significance for finding strategies to prevent EBV infection, and developing a therapy to treat EBV-associated diseases. In this review, we will discuss the molecular mechanisms of host immunological responses to EBV infection and the mechanisms of EBV-mediated immune evasion during chronic active infection.
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Affiliation(s)
- Yanqing Yao
- Department of Pediatrics, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Weijing Kong
- Department of Pediatrics, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Lijun Yang
- Department of Pediatrics, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Yingxue Ding
- Department of Pediatrics, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Hong Cui
- Department of Pediatrics, Beijing Friendship Hospital, Capital Medical University, Beijing, China
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8
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Villarroel-Espindola F, Ejsmentewicz T, Gonzalez-Stegmaier R, Jorquera RA, Salinas E. Intersections between innate immune response and gastric cancer development. World J Gastroenterol 2023; 29:2222-2240. [PMID: 37124883 PMCID: PMC10134417 DOI: 10.3748/wjg.v29.i15.2222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 11/07/2022] [Accepted: 03/13/2023] [Indexed: 04/14/2023] Open
Abstract
Worldwide, gastric cancer (GC) is the fifth most commonly diagnosed malignancy. It has a reduced prevalence but has maintained its poor prognosis being the fourth leading cause of deaths related to cancer. The highest mortality rates occur in Asian and Latin American countries, where cases are usually diagnosed at advanced stages. Overall, GC is viewed as the consequence of a multifactorial process, involving the virulence of the Helicobacter pylori (H. pylori) strains, as well as some environmental factors, dietary habits, and host intrinsic factors. The tumor microenvironment in GC appears to be chronically inflamed which promotes tumor progression and reduces the therapeutic opportunities. It has been suggested that inflammation assessment needs to be measured qualitatively and quantitatively, considering cell-infiltration types, availability of receptors to detect damage and pathogens, and presence or absence of aggressive H. pylori strains. Gastrointestinal epithelial cells express several Toll-like receptors and determine the first defensive line against pathogens, and have been also described as mediators of tumorigenesis. However, other molecules, such as cytokines related to inflammation and innate immunity, including immune checkpoint molecules, interferon-gamma pathway and NETosis have been associated with an increased risk of GC. Therefore, this review will explore innate immune activation in the context of premalignant lesions of the gastric epithelium and established gastric tumors.
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Affiliation(s)
- Franz Villarroel-Espindola
- Translational Medicine Unit, Instituto Oncologico Fundacion Arturo Lopez Perez, Santiago 7500000, Metropolitan region, Chile
| | - Troy Ejsmentewicz
- Translational Medicine Unit, Instituto Oncologico Fundacion Arturo Lopez Perez, Santiago 7500000, Metropolitan region, Chile
| | - Roxana Gonzalez-Stegmaier
- Translational Medicine Unit, Instituto Oncologico Fundacion Arturo Lopez Perez, Santiago 7500000, Metropolitan region, Chile
| | - Roddy A Jorquera
- Translational Medicine Unit, Instituto Oncologico Fundacion Arturo Lopez Perez, Santiago 7500000, Metropolitan region, Chile
| | - Esteban Salinas
- Translational Medicine Unit, Instituto Oncologico Fundacion Arturo Lopez Perez, Santiago 7500000, Metropolitan region, Chile
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9
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Rex V, Zargari R, Stempel M, Halle S, Brinkmann MM. The innate and T-cell mediated immune response during acute and chronic gammaherpesvirus infection. Front Cell Infect Microbiol 2023; 13:1146381. [PMID: 37065193 PMCID: PMC10102517 DOI: 10.3389/fcimb.2023.1146381] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 03/20/2023] [Indexed: 04/03/2023] Open
Abstract
Immediately after entry into host cells, viruses are sensed by the innate immune system, leading to the activation of innate antiviral effector mechanisms including the type I interferon (IFN) response and natural killer (NK) cells. This innate immune response helps to shape an effective adaptive T cell immune response mediated by cytotoxic T cells and CD4+ T helper cells and is also critical for the maintenance of protective T cells during chronic infection. The human gammaherpesvirus Epstein-Barr virus (EBV) is a highly prevalent lymphotropic oncovirus that establishes chronic lifelong infections in the vast majority of the adult population. Although acute EBV infection is controlled in an immunocompetent host, chronic EBV infection can lead to severe complications in immunosuppressed patients. Given that EBV is strictly host-specific, its murine homolog murid herpesvirus 4 or MHV68 is a widely used model to obtain in vivo insights into the interaction between gammaherpesviruses and their host. Despite the fact that EBV and MHV68 have developed strategies to evade the innate and adaptive immune response, innate antiviral effector mechanisms still play a vital role in not only controlling the acute infection but also shaping an efficient long-lasting adaptive immune response. Here, we summarize the current knowledge about the innate immune response mediated by the type I IFN system and NK cells, and the adaptive T cell-mediated response during EBV and MHV68 infection. Investigating the fine-tuned interplay between the innate immune and T cell response will provide valuable insights which may be exploited to design better therapeutic strategies to vanquish chronic herpesviral infection.
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Affiliation(s)
- Viktoria Rex
- Institute of Genetics, Technische Universität Braunschweig, Braunschweig, Germany
| | - Razieh Zargari
- Institute of Immunology, Hannover Medical School, Hannover, Germany
| | - Markus Stempel
- Institute of Genetics, Technische Universität Braunschweig, Braunschweig, Germany
- Virology and Innate Immunity Research Group, Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - Stephan Halle
- Institute of Immunology, Hannover Medical School, Hannover, Germany
- Institute of Clinical Chemistry, Hannover Medical School, Hannover, Germany
- *Correspondence: Stephan Halle, ; Melanie M. Brinkmann,
| | - Melanie M. Brinkmann
- Institute of Genetics, Technische Universität Braunschweig, Braunschweig, Germany
- Virology and Innate Immunity Research Group, Helmholtz Centre for Infection Research, Braunschweig, Germany
- *Correspondence: Stephan Halle, ; Melanie M. Brinkmann,
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10
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Casco A, Johannsen E. EBV Reactivation from Latency Is a Degrading Experience for the Host. Viruses 2023; 15:726. [PMID: 36992435 PMCID: PMC10054251 DOI: 10.3390/v15030726] [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: 02/07/2023] [Revised: 03/06/2023] [Accepted: 03/08/2023] [Indexed: 03/15/2023] Open
Abstract
During reactivation from latency, gammaherpesviruses radically restructure their host cell to produce virion particles. To achieve this and thwart cellular defenses, they induce rapid degradation of cytoplasmic mRNAs, suppressing host gene expression. In this article, we review mechanisms of shutoff by Epstein-Barr virus (EBV) and other gammaherpesviruses. In EBV, canonical host shutoff is accomplished through the action of the versatile BGLF5 nuclease expressed during lytic reactivation. We explore how BGLF5 induces mRNA degradation, the mechanisms by which specificity is achieved, and the consequences for host gene expression. We also consider non-canonical mechanisms of EBV-induced host shutoff. Finally, we summarize the limitations and barriers to accurate measurements of the EBV host shutoff phenomenon.
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Affiliation(s)
- Alejandro Casco
- Department of Oncology, McArdle Laboratory for Cancer Research, University of Wisconsin, Madison, WI 53705, USA
| | - Eric Johannsen
- Department of Oncology, McArdle Laboratory for Cancer Research, University of Wisconsin, Madison, WI 53705, USA
- Department of Medicine, Division of Infectious Diseases, University of Wisconsin, Madison, WI 53705, USA
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11
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Yu L, Zhu Z, Deng J, Tian K, Li X. Antagonisms of ASFV towards Host Defense Mechanisms: Knowledge Gaps in Viral Immune Evasion and Pathogenesis. Viruses 2023; 15:574. [PMID: 36851786 PMCID: PMC9963191 DOI: 10.3390/v15020574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 02/16/2023] [Accepted: 02/16/2023] [Indexed: 02/22/2023] Open
Abstract
African swine fever (ASF) causes high morbidity and mortality of both domestic pigs and wild boars and severely impacts the swine industry worldwide. ASF virus (ASFV), the etiologic agent of ASF epidemics, mainly infects myeloid cells in swine mononuclear phagocyte system (MPS), including blood-circulating monocytes, tissue-resident macrophages, and dendritic cells (DCs). Since their significant roles in bridging host innate and adaptive immunity, these cells provide ASFV with favorable targets to manipulate and block their antiviral activities, leading to immune escape and immunosuppression. To date, vaccines are still being regarded as the most promising measure to prevent and control ASF outbreaks. However, ASF vaccine development is delayed and limited by existing knowledge gaps in viral immune evasion, pathogenesis, etc. Recent studies have revealed that ASFV can employ diverse strategies to interrupt the host defense mechanisms via abundant self-encoded proteins. Thus, this review mainly focuses on the antagonisms of ASFV-encoded proteins towards IFN-I production, IFN-induced antiviral response, NLRP3 inflammasome activation, and GSDMD-mediated pyroptosis. Additionally, we also make a brief discussion concerning the potential challenges in future development of ASF vaccine.
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Affiliation(s)
- Liangzheng Yu
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, Ministry of Education, Yangzhou University, Yangzhou 225009, China
| | - Zhenbang Zhu
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, Ministry of Education, Yangzhou University, Yangzhou 225009, China
| | - Junhua Deng
- Luoyang Putai Biotech Co., Ltd., Luoyang 471003, China
| | - Kegong Tian
- College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou 450002, China
| | - Xiangdong Li
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, Ministry of Education, Yangzhou University, Yangzhou 225009, China
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12
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Broussard G, Ni G, Zhang Z, Li Q, Cano P, Dittmer DP, Damania B. Barrier-to-autointegration factor 1 promotes gammaherpesvirus reactivation from latency. Nat Commun 2023; 14:434. [PMID: 36746947 PMCID: PMC9902469 DOI: 10.1038/s41467-023-35898-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Accepted: 01/06/2023] [Indexed: 02/08/2023] Open
Abstract
Gammaherpesviruses, including Kaposi sarcoma-associated herpesvirus (KSHV) and Epstein-Barr virus (EBV), are DNA viruses that are globally associated with human cancers and establish lifelong latency in the human population. Detection of gammaherpesviral infection by the cGAS-STING innate immune DNA-sensing pathway is critical for suppressing viral reactivation from latency, a process that promotes viral pathogenesis and transmission. We report that barrier-to-autointegration factor 1 (BAF)-mediated suppression of the cGAS-STING signaling pathway is necessary for reactivation of KSHV and EBV. We demonstrate a role for BAF in destabilizing cGAS expression and show that inhibiting BAF expression in latently infected, reactivating, or uninfected cells leads to increased type I interferon-mediated antiviral responses and decreased viral replication. Furthermore, BAF overexpression resulted in decreased cGAS expression at the protein level. These results establish BAF as a key regulator of the lifecycle of gammaherpesviruses and a potential target for treating viral infections and malignancies.
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Affiliation(s)
- Grant Broussard
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Curriculum in Genetics and Molecular Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Guoxin Ni
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Zhigang Zhang
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Qian Li
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Patricio Cano
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Dirk P Dittmer
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Curriculum in Genetics and Molecular Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Blossom Damania
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.
- Curriculum in Genetics and Molecular Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.
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Hatton AA, Guerra FE. Scratching the Surface Takes a Toll: Immune Recognition of Viral Proteins by Surface Toll-like Receptors. Viruses 2022; 15:52. [PMID: 36680092 PMCID: PMC9863796 DOI: 10.3390/v15010052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2022] [Revised: 12/22/2022] [Accepted: 12/22/2022] [Indexed: 12/29/2022] Open
Abstract
Early innate viral recognition by the host is critical for the rapid response and subsequent clearance of an infection. Innate immune cells patrol sites of infection to detect and respond to invading microorganisms including viruses. Surface Toll-like receptors (TLRs) are a group of pattern recognition receptors (PRRs) that can be activated by viruses even before the host cell becomes infected. However, the early activation of surface TLRs by viruses can lead to viral clearance by the host or promote pathogenesis. Thus, a plethora of research has attempted to identify specific viral ligands that bind to surface TLRs and mediate progression of viral infection. Herein, we will discuss the past two decades of research that have identified specific viral proteins recognized by cell surface-associated TLRs, how these viral proteins and host surface TLR interactions affect the host inflammatory response and outcome of infection, and address why controversy remains regarding host surface TLR recognition of viral proteins.
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Affiliation(s)
- Alexis A. Hatton
- Department of Microbiology & Cell Biology, Montana State University, Bozeman, MT 59718, USA
| | - Fermin E. Guerra
- Department of Laboratory Medicine & Pathology, University of Washington, Seattle, WA 98195, USA
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14
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Diggins NL, Hancock MH. Viral miRNA regulation of host gene expression. Semin Cell Dev Biol 2022; 146:2-19. [PMID: 36463091 PMCID: PMC10101914 DOI: 10.1016/j.semcdb.2022.11.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 11/16/2022] [Accepted: 11/22/2022] [Indexed: 12/05/2022]
Abstract
Viruses have evolved a multitude of mechanisms to combat barriers to productive infection in the host cell. Virally-encoded miRNAs are one such means to regulate host gene expression in ways that benefit the virus lifecycle. miRNAs are small non-coding RNAs that regulate protein expression but do not trigger the adaptive immune response, making them powerful tools encoded by viruses to regulate cellular processes. Diverse viruses encode for miRNAs but little sequence homology exists between miRNAs of different viral species. Despite this, common cellular pathways are targeted for regulation, including apoptosis, immune evasion, cell growth and differentiation. Herein we will highlight the viruses that encode miRNAs and provide mechanistic insight into how viral miRNAs aid in lytic and latent infection by targeting common cellular processes. We also highlight how viral miRNAs can mimic host cell miRNAs as well as how viral miRNAs have evolved to regulate host miRNA expression. These studies dispel the myth that viral miRNAs are subtle regulators of gene expression, and highlight the critical importance of viral miRNAs to the virus lifecycle.
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Affiliation(s)
- Nicole L Diggins
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Portland, OR, USA
| | - Meaghan H Hancock
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Portland, OR, USA.
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15
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Bencze D, Fekete T, Pfliegler W, Szöőr Á, Csoma E, Szántó A, Tarr T, Bácsi A, Kemény L, Veréb Z, Pázmándi K. Interactions between the NLRP3-Dependent IL-1β and the Type I Interferon Pathways in Human Plasmacytoid Dendritic Cells. Int J Mol Sci 2022; 23:ijms232012154. [PMID: 36293012 PMCID: PMC9602791 DOI: 10.3390/ijms232012154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 09/29/2022] [Accepted: 10/04/2022] [Indexed: 11/16/2022] Open
Abstract
Generally, a reciprocal antagonistic interaction exists between the antiviral type I interferon (IFN) and the antibacterial nucleotide-binding oligomerization domain (NOD)-like receptor pyrin domain containing 3 (NLRP3)-dependent IL-1β pathways that can significantly shape immune responses. Plasmacytoid dendritic cells (pDCs), as professional type I IFN-producing cells, are the major coordinators of antiviral immunity; however, their NLRP3-dependent IL-1β secretory pathway is poorly studied. Our aim was to determine the functional activity of the IL-1β pathway and its possible interaction with the type I IFN pathway in pDCs. We found that potent nuclear factor-kappa B (NF-κB) inducers promote higher levels of pro-IL-1β during priming compared to those activation signals, which mainly trigger interferon regulatory factor (IRF)-mediated type I IFN production. The generation of cleaved IL-1β requires certain secondary signals in pDCs and IFN-α or type I IFN-inducing viruses inhibit IL-1β production of pDCs, presumably by promoting the expression of various NLRP3 pathway inhibitors. In line with that, we detected significantly lower IL-1β production in pDCs of psoriasis patients with elevated IFN-α levels. Collectively, our results show that the NLRP3-dependent IL-1β secretory pathway is inducible in pDCs; however, it may only prevail under inflammatory conditions, in which the type I IFN pathway is not dominant.
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Affiliation(s)
- Dóra Bencze
- Department of Immunology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
- Doctoral School of Molecular Cell and Immune Biology, University of Debrecen, 4032 Debrecen, Hungary
| | - Tünde Fekete
- Department of Immunology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
| | - Walter Pfliegler
- Department of Molecular Biotechnology and Microbiology, Faculty of Science and Technology, University of Debrecen, 4032 Debrecen, Hungary
| | - Árpád Szöőr
- Department of Biophysics and Cell Biology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
| | - Eszter Csoma
- Department of Medical Microbiology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
| | - Antónia Szántó
- Division of Clinical Immunology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
| | - Tünde Tarr
- Division of Clinical Immunology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
| | - Attila Bácsi
- Department of Immunology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
| | - Lajos Kemény
- Regenerative Medicine and Cellular Pharmacology Laboratory, Department of Dermatology and Allergology, Faculty of Medicine, University of Szeged, 6720 Szeged, Hungary
| | - Zoltán Veréb
- Regenerative Medicine and Cellular Pharmacology Laboratory, Department of Dermatology and Allergology, Faculty of Medicine, University of Szeged, 6720 Szeged, Hungary
| | - Kitti Pázmándi
- Department of Immunology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
- Correspondence: ; Tel./Fax: +36-52-417-159
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16
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Albanese M, Tagawa T, Hammerschmidt W. Strategies of Epstein-Barr virus to evade innate antiviral immunity of its human host. Front Microbiol 2022; 13:955603. [PMID: 35935191 PMCID: PMC9355577 DOI: 10.3389/fmicb.2022.955603] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Accepted: 06/27/2022] [Indexed: 12/18/2022] Open
Abstract
Epstein-Barr virus (EBV) is a double-stranded DNA virus of the Herpesviridae family. This virus preferentially infects human primary B cells and persists in the human B cell compartment for a lifetime. Latent EBV infection can lead to the development of different types of lymphomas as well as carcinomas such as nasopharyngeal and gastric carcinoma in immunocompetent and immunocompromised patients. The early phase of viral infection is crucial for EBV to establish latency, but different viral components are sensed by cellular sensors called pattern recognition receptors (PRRs) as the first line of host defense. The efficacy of innate immunity, in particular the interferon-mediated response, is critical to control viral infection initially and to trigger a broad spectrum of specific adaptive immune responses against EBV later. Despite these restrictions, the virus has developed various strategies to evade the immune reaction of its host and to establish its lifelong latency. In its different phases of infection, EBV expresses up to 44 different viral miRNAs. Some act as viral immunoevasins because they have been shown to counteract innate as well as adaptive immune responses. Similarly, certain virally encoded proteins also control antiviral immunity. In this review, we discuss how the virus governs innate immune responses of its host and exploits them to its advantage.
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Affiliation(s)
- Manuel Albanese
- Max von Pettenkofer Institute and Gene Center, Virology, National Reference Center for Retroviruses, Faculty of Medicine, Ludwig Maximilian University of Munich, Munich, Germany
- Istituto Nazionale di Genetica Molecolare, “Romeo ed Enrica Invernizzi,” Milan, Italy
- Research Unit Gene Vectors, EBV Vaccine Development Unit, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany
- German Center for Infection Research (DZIF), Partner Site Munich, Munich, Germany
| | - Takanobu Tagawa
- Research Unit Gene Vectors, EBV Vaccine Development Unit, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany
- German Center for Infection Research (DZIF), Partner Site Munich, Munich, Germany
- HIV and AIDS Malignancy Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, United States
| | - Wolfgang Hammerschmidt
- Research Unit Gene Vectors, EBV Vaccine Development Unit, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany
- German Center for Infection Research (DZIF), Partner Site Munich, Munich, Germany
- *Correspondence: Wolfgang Hammerschmidt,
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17
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Lange PT, White MC, Damania B. Activation and Evasion of Innate Immunity by Gammaherpesviruses. J Mol Biol 2022; 434:167214. [PMID: 34437888 PMCID: PMC8863980 DOI: 10.1016/j.jmb.2021.167214] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 08/11/2021] [Accepted: 08/13/2021] [Indexed: 12/20/2022]
Abstract
Gammaherpesviruses are ubiquitous pathogens that establish lifelong infections in the vast majority of adults worldwide. Importantly, these viruses are associated with numerous malignancies and are responsible for significant human cancer burden. These virus-associated cancers are due, in part, to the ability of gammaherpesviruses to successfully evade the innate immune response throughout the course of infection. In this review, we will summarize the current understanding of how gammaherpesviruses are detected by innate immune sensors, how these viruses evade recognition by host cells, and how this knowledge can inform novel therapeutic approaches for these viruses and their associated diseases.
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Affiliation(s)
- Philip T Lange
- Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA; Department of Microbiology and Immunology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA. https://twitter.com/langept
| | - Maria C White
- Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA; Department of Microbiology and Immunology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA. https://twitter.com/maria_c_white
| | - Blossom Damania
- Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA; Department of Microbiology and Immunology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
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18
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Leffler J, Trend S, Gorman S, Hart PH. Sex-Specific Environmental Impacts on Initiation and Progression of Multiple Sclerosis. Front Neurol 2022; 13:835162. [PMID: 35185777 PMCID: PMC8850837 DOI: 10.3389/fneur.2022.835162] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Accepted: 01/12/2022] [Indexed: 12/28/2022] Open
Abstract
The immunological mechanisms that contribute to multiple sclerosis (MS) differ between males and females. Females are 2–3 times more likely to develop MS compared to males, however the reason for this discrepancy is unknown. Once MS is established, there is a more inflammatory yet milder form of disease in females whereas males generally suffer from more severe disease and faster progression, neural degradation, and disability. Some of these differences relate to genetics, including genetic control of immune regulatory genes on the X-chromosome, as well as immune modulatory properties of sex hormones. Differences in MS development may also relate to how sex interacts with environmental risk factors. There are several environmental risk factors for MS including late-onset Epstein Barr virus infection, low serum vitamin D levels, low UV radiation exposure, smoking, obesity, and lack of physical activity. Most of these risk factors impact males and females differently, either due to biological or immunological processes or through behavioral differences. In this review, we explore these differences further and focus on how the interaction of environmental risk factors with sex hormones may contribute to significantly different prevalence and pathology of MS in males and females.
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Affiliation(s)
- Jonatan Leffler
- Telethon Kids Institute, University of Western Australia, Nedlands, WA, Australia
- *Correspondence: Jonatan Leffler
| | - Stephanie Trend
- Telethon Kids Institute, University of Western Australia, Nedlands, WA, Australia
- Centre for Neuromuscular and Neurological Disorders, Perron Institute for Neurological and Translational Science, University of Western Australia, Perth, WA, Australia
| | - Shelley Gorman
- Telethon Kids Institute, University of Western Australia, Nedlands, WA, Australia
| | - Prue H. Hart
- Telethon Kids Institute, University of Western Australia, Nedlands, WA, Australia
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Ishikawa Y, Yamada M, Wada N, Takahashi E, Imadome KI. Mucosal-associated invariant T cells are activated in an interleukin-18-dependent manner in Epstein-Barr virus-associated T/natural killer cell lymphoproliferative diseases. Clin Exp Immunol 2022; 207:141-148. [PMID: 35380609 PMCID: PMC8982962 DOI: 10.1093/cei/uxab004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 09/30/2021] [Accepted: 10/15/2021] [Indexed: 02/03/2023] Open
Abstract
Mucosal-associated invariant T (MAIT) cells are a type of innate immune cells that protect against some infections. However, the involvement of MAIT cells in Epstein-Barr virus-associated T/natural killer cell lymphoproliferative diseases (EBV-T/NK-LPD) is unclear. In this study, we found that MAIT cells were highly activated in the blood of patients with EBV-T/NK-LPD. MAIT cell activation levels correlated with disease severity and plasma IL-18 levels. Stimulation of healthy peripheral blood mononuclear cells with EBV resulted in activation of MAIT cells, and this activation level was enhanced by exogenous IL-18. MAIT cells stimulated by IL-18 might thus be involved in the immunopathogenesis of EBV-T/NK-LPD.
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Affiliation(s)
- Yuriko Ishikawa
- Department of Advanced Medicine for Viral Infections, National Center for Child Health and Development (NCCHD), Tokyo, Japan
- Correspondence: Yuriko Ishikawa, Department of Advanced Medicine for Infections, National Center for Child Health and Development (NCCHD), Tokyo, 157–8535, Japan.
| | - Masaki Yamada
- Department of Advanced Medicine for Viral Infections, National Center for Child Health and Development (NCCHD), Tokyo, Japan
| | - Naomi Wada
- Department of Advanced Medicine for Viral Infections, National Center for Child Health and Development (NCCHD), Tokyo, Japan
| | - Etsuko Takahashi
- Department of Advanced Medicine for Viral Infections, National Center for Child Health and Development (NCCHD), Tokyo, Japan
| | - Ken-Ichi Imadome
- Department of Advanced Medicine for Viral Infections, National Center for Child Health and Development (NCCHD), Tokyo, Japan
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20
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Liu L, Wang Y, Wang W, Ying W, Sun B, Wang X, Sun J. Increased expression of the TLR7/9 signaling pathways in chronic active EBV infection. Front Pediatr 2022; 10:1091571. [PMID: 36619523 PMCID: PMC9811674 DOI: 10.3389/fped.2022.1091571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Accepted: 12/05/2022] [Indexed: 12/24/2022] Open
Abstract
We aimed to investigate the immunological mechanisms of the Toll-like receptor (TLR) signaling pathways in different types of Epstein-Barr virus (EBV) infection. We retrospectively summarized the clinical data, routine laboratory tests and the immunological function of the infectious mononucleosis (IM) and chronic active EBV infection (CAEBV) patients. A real-time quantitative PCR array was used to detect the mRNA expression levels of TLR7/TLR9 and myeloid-differentiation factor 88 (MyD88). Flow cytometry was used to detect the protein expression of TLR7/TLR9. The MyD88 and nuclear factor-κB (NF-κB) (p65) protein were detected by western blotting. A cytometric bead array (CBA) assay was used to detect the expression of downstream cytokines. CAEBV patients presented with increased expression of TLR7/TLR9 in monocytes and B lymphocytes. TLR9 expression in the B lymphocytes of IM patients was decreased compared with the CAEBV pateints. Downstream signaling mediators, including MyD88 and NF-κB, were revealed to be increased in EBV-infected patients. Moreover, the expression of MyD88 and NF-κB was higher in CAEBV patients, leading to disrupted balance of downstream cytokines. EBV may activate the immune system via TLR7/TLR9 signaling pathways. Moreover, the overactivated TLR7/TLR9 pathway in CAEBV patients resulted in excessive inflammation, which might be relevant to the poor prognosis.
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Affiliation(s)
- Luyao Liu
- Department of Clinical Immunology, Children's Hospital of Fudan University, National Chlidren's Medical Center, Shanghai, China
| | - Ying Wang
- Department of Clinical Immunology, Children's Hospital of Fudan University, National Chlidren's Medical Center, Shanghai, China
| | - Wenjie Wang
- Department of Clinical Immunology, Children's Hospital of Fudan University, National Chlidren's Medical Center, Shanghai, China
| | - Wenjing Ying
- Department of Clinical Immunology, Children's Hospital of Fudan University, National Chlidren's Medical Center, Shanghai, China
| | - Bijun Sun
- Department of Clinical Immunology, Children's Hospital of Fudan University, National Chlidren's Medical Center, Shanghai, China
| | - Xiaochuan Wang
- Department of Clinical Immunology, Children's Hospital of Fudan University, National Chlidren's Medical Center, Shanghai, China
| | - Jinqiao Sun
- Department of Clinical Immunology, Children's Hospital of Fudan University, National Chlidren's Medical Center, Shanghai, China
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21
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Blanco R, Carrillo-Beltrán D, Corvalán AH, Aguayo F. High-Risk Human Papillomavirus and Epstein-Barr Virus Coinfection: A Potential Role in Head and Neck Carcinogenesis. BIOLOGY 2021; 10:biology10121232. [PMID: 34943147 PMCID: PMC8698839 DOI: 10.3390/biology10121232] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/06/2021] [Revised: 11/15/2021] [Accepted: 11/18/2021] [Indexed: 12/12/2022]
Abstract
Simple Summary A subset of carcinomas that arise in the head and neck region show a viral etiology. In fact, a subgroup of oropharyngeal cancers are caused by some types of human papillomavirus (HPV), so-called high-risk (HR)-HPVs, whereas undifferentiated nasopharyngeal carcinomas are etiologically related to Epstein–Barr virus (EBV). However, studies have reported the presence of both HR-HPV and EBV in some types of head and neck cancers. In this review, we discuss the potential contribution and role of HR-HPV/EBV coinfection in head and neck carcinogenesis, as well as the mechanisms that are potentially involved. In addition, HR-HPV/EBV interaction models are proposed. Abstract High-risk human papillomaviruses (HR-HPVs) and Epstein–Barr virus (EBV) are recognized oncogenic viruses involved in the development of a subset of head and neck cancers (HNCs). HR-HPVs are etiologically associated with a subset of oropharyngeal carcinomas (OPCs), whereas EBV is a recognized etiological agent of undifferentiated nasopharyngeal carcinomas (NPCs). In this review, we address epidemiological and mechanistic evidence regarding a potential cooperation between HR-HPV and EBV for HNC development. Considering that: (1) both HR-HPV and EBV infections require cofactors for carcinogenesis; and (2) both oropharyngeal and oral epithelium can be directly exposed to carcinogens, such as alcohol or tobacco smoke, we hypothesize possible interaction mechanisms. The epidemiological and experimental evidence suggests that HR-HPV/EBV cooperation for developing a subset of HNCs is plausible and warrants further investigation.
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Affiliation(s)
- Rancés Blanco
- Programa de Virología, Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de Chile, Santiago 8380000, Chile; (R.B.); (D.C.-B.)
| | - Diego Carrillo-Beltrán
- Programa de Virología, Instituto de Ciencias Biomédicas (ICBM), Facultad de Medicina, Universidad de Chile, Santiago 8380000, Chile; (R.B.); (D.C.-B.)
| | - Alejandro H. Corvalán
- Advanced Center for Chronic Diseases (ACCDiS), Pontificia Universidad Católica de Chile, Santiago 8320000, Chile;
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22
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Gaglia MM. Anti-viral and pro-inflammatory functions of Toll-like receptors during gamma-herpesvirus infections. Virol J 2021; 18:218. [PMID: 34749760 PMCID: PMC8576898 DOI: 10.1186/s12985-021-01678-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Accepted: 10/12/2021] [Indexed: 12/15/2022] Open
Abstract
Toll-like receptors (TLRs) control anti-viral responses both directly in infected cells and in responding cells of the immune systems. Therefore, they are crucial for responses against the oncogenic γ-herpesviruses Epstein-Barr virus and Kaposi's sarcoma-associated herpesvirus and the related murine virus MHV68, which directly infect immune system cells. However, since these viruses also cause lifelong persistent infections, TLRs may also be involved in modulation of inflammation during latent infection and contribute to virus-driven tumorigenesis. This review summarizes work on both of these aspects of TLR/γ-herpesvirus interactions, as well as results showing that TLR activity can drive these viruses' re-entry into the replicative lytic cycle.
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Affiliation(s)
- Marta Maria Gaglia
- Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, MA, 02111, USA.
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23
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Oleszycka E, Rodgers AM, Xu L, Moynagh PN. Dendritic Cell-Specific Role for Pellino2 as a Mediator of TLR9 Signaling Pathway. THE JOURNAL OF IMMUNOLOGY 2021; 207:2325-2336. [PMID: 34588221 PMCID: PMC8525870 DOI: 10.4049/jimmunol.2100236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Accepted: 08/22/2021] [Indexed: 11/26/2022]
Abstract
Ubiquitination regulates immune signaling, and multiple E3 ubiquitin ligases have been studied in the context of their role in immunity. Despite this progress, the physiological roles of the Pellino E3 ubiquitin ligases, especially Pellino2, in immune regulation remain largely unknown. Accordingly, this study aimed to elucidate the role of Pellino2 in murine dendritic cells (DCs). In this study, we reveal a critical role of Pellino2 in regulation of the proinflammatory response following TLR9 stimulation. Pellino2-deficient murine DCs show impaired secretion of IL-6 and IL-12. Loss of Pellino2 does not affect TLR9-induced activation of NF-κB or MAPKs, pathways that drive expression of IL-6 and IL-12. Furthermore, DCs from Pellino2-deficient mice show impaired production of type I IFN following endosomal TLR9 activation, and it partly mediates a feed-forward loop of IFN-β that promotes IL-12 production in DCs. We also observe that Pellino2 in murine DCs is downregulated following TLR9 stimulation, and its overexpression induces upregulation of both IFN-β and IL-12, demonstrating the sufficiency of Pellino2 in driving these responses. This suggests that Pellino2 is critical for executing TLR9 signaling, with its expression being tightly regulated to prevent excessive inflammatory response. Overall, this study highlights a (to our knowledge) novel role for Pellino2 in regulating DC functions and further supports important roles for Pellino proteins in mediating and controlling immunity. Pellino2 mediates TLR9-induced cytokine production in dendritic cells. Pellino2 does not play a role in TLR9 signaling in macrophages. Pellino2 is a limiting factor for TLR9 signaling in dendritic cells.
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Affiliation(s)
- Ewa Oleszycka
- Department of Biology, The Kathleen Lonsdale Institute for Human Health Research, Maynooth University, Maynooth, Kildare, Ireland; and
| | - Aoife M Rodgers
- Department of Biology, The Kathleen Lonsdale Institute for Human Health Research, Maynooth University, Maynooth, Kildare, Ireland; and
| | - Linan Xu
- Department of Biology, The Kathleen Lonsdale Institute for Human Health Research, Maynooth University, Maynooth, Kildare, Ireland; and
| | - Paul N Moynagh
- Department of Biology, The Kathleen Lonsdale Institute for Human Health Research, Maynooth University, Maynooth, Kildare, Ireland; and .,Wellcome-Wolfson Institute for Experimental Medicine, Queen's University Belfast, Belfast, United Kingdom
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24
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Targhetta VP, Amaral MA, Camara NOS. Through DNA sensors and hidden mitochondrial effects of SARS-CoV-2. J Venom Anim Toxins Incl Trop Dis 2021; 27:e20200183. [PMID: 34471404 PMCID: PMC8383803 DOI: 10.1590/1678-9199-jvatitd-2020-0183] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Accepted: 04/08/2021] [Indexed: 12/23/2022] Open
Abstract
The COVID-19 pandemic brought attention to studies about viral infections and their impact on the cell machinery. SARS-CoV-2, for example, invades the host cells by ACE2 interaction and possibly hijacks the mitochondria. To better understand the disease and to propose novel treatments, crucial aspects of SARS-CoV-2 enrolment with host mitochondria must be studied. The replicative process of the virus leads to consequences in mitochondrial function, and cell metabolism. The hijacking of mitochondria, on the other hand, can drive the extrusion of mitochondrial DNA (mtDNA) to the cytosol. Extracellular mtDNA evoke robust proinflammatory responses once detected, that may act in different pathways, eliciting important immune responses. However, few receptors are validated and are able to detect and respond to mtDNA. In this review, we propose that the mtDNA and its detection might be important in the immune process generated by SARS-CoV-2 and that this mechanism might be important in the lung pathogenesis seen in clinical symptoms. Therefore, investigating the mtDNA receptors and their signaling pathways might provide important clues for therapeutic interventions.
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Affiliation(s)
- Vitor Pedro Targhetta
- Department of Immunology, Institute of Biomedical Sciences (ICB), University of São Paulo (USP), São Paulo, SP, Brazil
| | - Mariana Abrantes Amaral
- Department of Nephrology, Paulista School of Medicine (EPM), Federal University of São Paulo (Unifesp), São Paulo, SP, Brazil
| | - Niels Olsen Saraiva Camara
- Department of Immunology, Institute of Biomedical Sciences (ICB), University of São Paulo (USP), São Paulo, SP, Brazil
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25
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Münz C. Immune Escape by Non-coding RNAs of the Epstein Barr Virus. Front Microbiol 2021; 12:657387. [PMID: 34234755 PMCID: PMC8257079 DOI: 10.3389/fmicb.2021.657387] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Accepted: 05/28/2021] [Indexed: 01/20/2023] Open
Abstract
Epstein Barr virus (EBV) is one of the most successful pathogens of humans, persistently colonizing more than 95% of the adult human population. At the same time EBV encodes oncogenes that can readily transform human B cells in culture and threaten healthy virus carriers with lymphomagenesis. Cytotoxic lymphocytes have been identified in experimental models and by primary immunodeficiencies as the main protective immune compartments controlling EBV. EBV has reached a stalemate with these cytotoxic T and innate lymphocytes to ensure persistence in most infected humans. Recent evidence suggests that the non-coding RNAs of the virus contribute to viral immune escape to prevent immune eradication. This knowledge might be used in the future to attenuate EBV for vaccine development against this human tumor virus that was discovered more than 55 years ago.
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Affiliation(s)
- Christian Münz
- Viral Immunobiology, Institute of Experimental Immunology, University of Zurich, Zurich, Switzerland
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26
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Drosu N, Giovannoni G, Pohl D, Hawkes C, Lechner-Scott J, Levy M. Probing the association between Multiple Sclerosis and Epstein Barr Virus from a therapeutic perspective. Mult Scler Relat Disord 2021; 52:103087. [PMID: 34139660 DOI: 10.1016/j.msard.2021.103087] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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27
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Farina A, Rosato E, York M, Gewurz BE, Trojanowska M, Farina GA. Innate Immune Modulation Induced by EBV Lytic Infection Promotes Endothelial Cell Inflammation and Vascular Injury in Scleroderma. Front Immunol 2021; 12:651013. [PMID: 33953718 PMCID: PMC8089375 DOI: 10.3389/fimmu.2021.651013] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Accepted: 04/01/2021] [Indexed: 12/19/2022] Open
Abstract
Microvascular injury is considered an initial event in the pathogenesis of scleroderma and endothelial cells are suspected of being the target of the autoimmune process seen in the disease. EBV has long been proposed as a trigger for autoimmune diseases, including scleroderma. Nevertheless, its contribution to the pathogenic process remains poorly understood. In this study, we report that EBV lytic antigens are detected in scleroderma dermal vessels, suggesting that endothelial cells might represent a target for EBV infection in scleroderma skin. We show that EBV DNA load is remarkably increased in peripheral blood, plasma and circulating monocytes from scleroderma patients compared to healthy EBV carriers, and that monocytes represent the prominent subsets of EBV-infected cells in scleroderma. Given that monocytes have the capacity to adhere to the endothelium, we then investigated whether monocyte-associated EBV could infect primary human endothelial cells. We demonstrated that endothelial cells are infectable by EBV, using human monocytes bound to recombinant EBV as a shuttle, even though cell-free virus failed to infect them. We show that EBV induces activation of TLR9 innate immune response and markers of vascular injury in infected endothelial cells and that up-regulation is associated with the expression of EBV lytic genes in infected cells. EBV innate immune modulation suggests a novel mechanism mediating inflammation, by which EBV triggers endothelial cell and vascular injury in scleroderma. In addition, our data point to up-regulation of EBV DNA loads as potential biomarker in developing vasculopathy in scleroderma. These findings provide the framework for the development of novel therapeutic interventions to shift the scleroderma treatment paradigm towards antiviral therapies.
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Affiliation(s)
- Antonella Farina
- Department of Experimental Medicine, Sapienza University, Rome, Italy
| | - Edoardo Rosato
- Department of Clinical Medicine, Sapienza University, Rome, Italy
| | - Michael York
- Division of Rheumatology, Boston University School of Medicine, Boston, MA, United States
| | - Benjamin E Gewurz
- Division of Infectious Diseases, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, United States.,Program in Virology, Harvard Medical School, Boston, MA, United States.,Broad Institute of Harvard and MIT, Cambridge, MA, United States
| | - Maria Trojanowska
- Division of Rheumatology, Boston University School of Medicine, Boston, MA, United States
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28
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Bouvet M, Voigt S, Tagawa T, Albanese M, Chen YFA, Chen Y, Fachko DN, Pich D, Göbel C, Skalsky RL, Hammerschmidt W. Multiple Viral microRNAs Regulate Interferon Release and Signaling Early during Infection with Epstein-Barr Virus. mBio 2021; 12:e03440-20. [PMID: 33785626 PMCID: PMC8092300 DOI: 10.1128/mbio.03440-20] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Accepted: 02/18/2021] [Indexed: 12/15/2022] Open
Abstract
Epstein-Barr virus (EBV), a human herpesvirus, encodes 44 microRNAs (miRNAs), which regulate many genes with various functions in EBV-infected cells. Multiple target genes of the EBV miRNAs have been identified, some of which play important roles in adaptive antiviral immune responses. Using EBV mutant derivatives, we identified additional roles of viral miRNAs in governing versatile type I interferon (IFN) responses upon infection of human primary mature B cells. We also found that Epstein-Barr virus-encoded small RNAs (EBERs) and LF2, viral genes with previously reported functions in inducing or regulating IFN-I pathways, had negligible or even contrary effects on secreted IFN-α in our model. Data mining and Ago PAR-CLIP experiments uncovered more than a dozen previously uncharacterized, direct cellular targets of EBV miRNA associated with type I IFN pathways. We also identified indirect targets of EBV miRNAs in B cells, such as TRL7 and TLR9, in the prelatent phase of infection. The presence of epigenetically naive, non-CpG methylated viral DNA was essential to induce IFN-α secretion during EBV infection in a TLR9-dependent manner. In a newly established fusion assay, we verified that EBV virions enter a subset of plasmacytoid dendritic cells (pDCs) and determined that these infected pDCs are the primary producers of IFN-α in EBV-infected peripheral blood mononuclear cells. Our findings document that many EBV-encoded miRNAs regulate type I IFN response in newly EBV infected primary human B cells in the prelatent phase of infection and dampen the acute release of IFN-α in pDCs upon their encounter with EBV.IMPORTANCE Acute antiviral functions of all nucleated cells rely on type I interferon (IFN-I) pathways triggered upon viral infection. Host responses encompass the sensing of incoming viruses, the activation of specific transcription factors that induce the transcription of IFN-I genes, the secretion of different IFN-I types and their recognition by the heterodimeric IFN-α/β receptor, the subsequent activation of JAK/STAT signaling pathways, and, finally, the transcription of many IFN-stimulated genes (ISGs). In sum, these cellular functions establish a so-called antiviral state in infected and neighboring cells. To counteract these cellular defense mechanisms, viruses have evolved diverse strategies and encode gene products that target antiviral responses. Among such immune-evasive factors are viral microRNAs (miRNAs) that can interfere with host gene expression. We discovered that multiple miRNAs of Epstein-Barr virus (EBV) control over a dozen cellular genes that contribute to the antiviral states of immune cells, specifically B cells and plasmacytoid dendritic cells (pDCs). We identified the viral DNA genome as the activator of IFN-α and question the role of abundant EBV EBERs, that, contrary to previous reports, do not have an apparent inducing function in the IFN-I pathway early after infection.
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Affiliation(s)
- Mickaël Bouvet
- Research Unit Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health and German Center for Infection Research (DZIF), Partner site Munich, Munich, Germany
| | - Stefanie Voigt
- Research Unit Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health and German Center for Infection Research (DZIF), Partner site Munich, Munich, Germany
| | - Takanobu Tagawa
- Research Unit Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health and German Center for Infection Research (DZIF), Partner site Munich, Munich, Germany
| | - Manuel Albanese
- Research Unit Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health and German Center for Infection Research (DZIF), Partner site Munich, Munich, Germany
| | - Yen-Fu Adam Chen
- Research Unit Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health and German Center for Infection Research (DZIF), Partner site Munich, Munich, Germany
| | - Yan Chen
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, Oregon, USA
| | - Devin N Fachko
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, Oregon, USA
| | - Dagmar Pich
- Research Unit Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health and German Center for Infection Research (DZIF), Partner site Munich, Munich, Germany
| | - Christine Göbel
- Research Unit Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health and German Center for Infection Research (DZIF), Partner site Munich, Munich, Germany
| | - Rebecca L Skalsky
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, Oregon, USA
| | - Wolfgang Hammerschmidt
- Research Unit Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health and German Center for Infection Research (DZIF), Partner site Munich, Munich, Germany
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29
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Madi JR, Outa AA, Ghannam M, Hussein HM, Shehab M, Hasan ZAKH, Fayad AA, Shirinian M, Rahal EA. Drosophila melanogaster as a Model System to Assess the Effect of Epstein-Barr Virus DNA on Inflammatory Gut Diseases. Front Immunol 2021; 12:586930. [PMID: 33828545 PMCID: PMC8019809 DOI: 10.3389/fimmu.2021.586930] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 03/03/2021] [Indexed: 01/05/2023] Open
Abstract
The Epstein-Barr virus (EBV) commonly infects humans and is highly associated with different types of cancers and autoimmune diseases. EBV has also been detected in inflamed gastrointestinal mucosa of patients suffering from prolonged inflammation of the digestive tract such as inflammatory bowel disease (IBD) with no clear role identified yet for EBV in the pathology of such diseases. Since we have previously reported immune-stimulating capabilities of EBV DNA in various models, in this study we investigated whether EBV DNA may play a role in exacerbating intestinal inflammation through innate immune and regeneration responses using the Drosophila melanogaster model. We have generated inflamed gastrointestinal tracts in adult fruit flies through the administration of dextran sodium sulfate (DSS), a sulfated polysaccharide that causes human ulcerative colitis- like pathologies due to its toxicity to intestinal cells. Intestinal damage induced by inflammation recruited plasmatocytes to the ileum in fly hindguts. EBV DNA aggravated inflammation by enhancing the immune deficiency (IMD) pathway as well as further increasing the cellular inflammatory responses manifested upon the administration of DSS. The study at hand proposes a possible immunostimulatory role of the viral DNA exerted specifically in the fly hindgut hence further developing our understanding of immune responses mounted against EBV DNA in the latter intestinal segment of the D. melanogaster gut. These findings suggest that EBV DNA may perpetuate proinflammatory processes initiated in an inflamed digestive system. Our findings indicate that D. melanogaster can serve as a model to further understand EBV-associated gastroinflammatory pathologies. Further studies employing mammalian models may validate the immunogenicity of EBV DNA in an IBD context and its role in exacerbating the disease through inflammatory mediators.
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Affiliation(s)
- Joelle R Madi
- Department of Experimental Pathology and Immunology, American University of Beirut, Faculty of Medicine, Beirut, Lebanon.,Center for Infectious Diseases Research, American University of Beirut Medical Center, Beirut, Lebanon
| | - Amani Al Outa
- Department of Anatomy, Cell Biology and Physiology, American University of Beirut, Faculty of Medicine, Beirut, Lebanon
| | - Mirna Ghannam
- Department of Experimental Pathology and Immunology, American University of Beirut, Faculty of Medicine, Beirut, Lebanon.,Center for Infectious Diseases Research, American University of Beirut Medical Center, Beirut, Lebanon
| | - Hadi M Hussein
- Department of Experimental Pathology and Immunology, American University of Beirut, Faculty of Medicine, Beirut, Lebanon.,Center for Infectious Diseases Research, American University of Beirut Medical Center, Beirut, Lebanon
| | - Marwa Shehab
- Department of Experimental Pathology and Immunology, American University of Beirut, Faculty of Medicine, Beirut, Lebanon.,Center for Infectious Diseases Research, American University of Beirut Medical Center, Beirut, Lebanon
| | - Zeinab Al Kobra Haj Hasan
- Department of Experimental Pathology and Immunology, American University of Beirut, Faculty of Medicine, Beirut, Lebanon.,Center for Infectious Diseases Research, American University of Beirut Medical Center, Beirut, Lebanon
| | - Antoine Abou Fayad
- Department of Experimental Pathology and Immunology, American University of Beirut, Faculty of Medicine, Beirut, Lebanon.,Center for Infectious Diseases Research, American University of Beirut Medical Center, Beirut, Lebanon
| | - Margret Shirinian
- Department of Experimental Pathology and Immunology, American University of Beirut, Faculty of Medicine, Beirut, Lebanon.,Center for Infectious Diseases Research, American University of Beirut Medical Center, Beirut, Lebanon
| | - Elias A Rahal
- Department of Experimental Pathology and Immunology, American University of Beirut, Faculty of Medicine, Beirut, Lebanon.,Center for Infectious Diseases Research, American University of Beirut Medical Center, Beirut, Lebanon
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30
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Bhowmik D, Zhu F. Evasion of Intracellular DNA Sensing by Human Herpesviruses. Front Cell Infect Microbiol 2021; 11:647992. [PMID: 33791247 PMCID: PMC8005619 DOI: 10.3389/fcimb.2021.647992] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Accepted: 02/17/2021] [Indexed: 12/14/2022] Open
Abstract
Sensing of viral constituents is the first and critical step in the host innate immune defense against viruses. In mammalian cells, there are a variety of pathogen recognition receptors (PRRs) that detect diverse pathogen-associated molecular patterns (PAMPs) including viral RNA and DNA. In the past decade, a number of host DNA sensors have been discovered and the underlying sensing mechanisms have been elucidated. Herpesviruses belong to a large family of enveloped DNA viruses. They are successful pathogens whose elaborate immune evasion mechanisms contribute to high prevalence of infection among their hosts. The three subfamilies of herpesviruses have all been found to employ diverse and overlapping strategies to interfere with host DNA sensing. These strategies include masking viral DNA or the DNA sensor, degradation of the DNA sensor, and post-transcriptional modification of the DNA sensor or its adaptor protein. In this review, we will discuss the current state of our knowledge on how human herpesviruses use these strategies to evade DNA-induced immune responses. Comprehensive understanding of herpesvirus immune-evasion mechanisms will aid in the development of vaccines and antivirals for herpesvirus-associated diseases.
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Affiliation(s)
| | - Fanxiu Zhu
- Department of Biological Science, Florida State University, Tallahassee, FL, United States
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31
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Singh H, Koury J, Kaul M. Innate Immune Sensing of Viruses and Its Consequences for the Central Nervous System. Viruses 2021; 13:170. [PMID: 33498715 PMCID: PMC7912342 DOI: 10.3390/v13020170] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 01/19/2021] [Accepted: 01/20/2021] [Indexed: 12/13/2022] Open
Abstract
Viral infections remain a global public health concern and cause a severe societal and economic burden. At the organismal level, the innate immune system is essential for the detection of viruses and constitutes the first line of defense. Viral components are sensed by host pattern recognition receptors (PRRs). PRRs can be further classified based on their localization into Toll-like receptors (TLRs), C-type lectin receptors (CLR), retinoic acid-inducible gene-I (RIG-I)-like receptors (RLRs), NOD-like receptors (NLRs) and cytosolic DNA sensors (CDS). TLR and RLR signaling results in production of type I interferons (IFNα and -β) and pro-inflammatory cytokines in a cell-specific manner, whereas NLR signaling leads to the production of interleukin-1 family proteins. On the other hand, CLRs are capable of sensing glycans present in viral pathogens, which can induce phagocytic, endocytic, antimicrobial, and pro- inflammatory responses. Peripheral immune sensing of viruses and the ensuing cytokine response can significantly affect the central nervous system (CNS). But viruses can also directly enter the CNS via a multitude of routes, such as the nasal epithelium, along nerve fibers connecting to the periphery and as cargo of infiltrating infected cells passing through the blood brain barrier, triggering innate immune sensing and cytokine responses directly in the CNS. Here, we review mechanisms of viral immune sensing and currently recognized consequences for the CNS of innate immune responses to viruses.
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Affiliation(s)
- Hina Singh
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, CA 92521, USA; (H.S.); (J.K.)
- Infectious and Inflammatory Disease Center, Sanford Burnham Prebys Medical Discovery Institute, 10901 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Jeffrey Koury
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, CA 92521, USA; (H.S.); (J.K.)
| | - Marcus Kaul
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, CA 92521, USA; (H.S.); (J.K.)
- Infectious and Inflammatory Disease Center, Sanford Burnham Prebys Medical Discovery Institute, 10901 North Torrey Pines Road, La Jolla, CA 92037, USA
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32
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Zheng X, Wang J, Zhang X, Fu Y, Peng Q, Lu J, Wei L, Li Z, Liu C, Wu Y, Yan Q, Ma J. RNA m 6 A methylation regulates virus-host interaction and EBNA2 expression during Epstein-Barr virus infection. IMMUNITY INFLAMMATION AND DISEASE 2021; 9:351-362. [PMID: 33434416 PMCID: PMC8127537 DOI: 10.1002/iid3.396] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 10/24/2020] [Accepted: 11/25/2020] [Indexed: 12/19/2022]
Abstract
Introduction N6‐methyladenosine (m6A) is the most prevalent modification that occurs in messenger RNA (mRNA), affecting mRNA splicing, translation, and stability. This modification is reversible, and its related biological functions are mediated by “writers,” “erasers,” and “readers.” The field of viral epitranscriptomics and the role of m6A modification in virus–host interaction have attracted much attention recently. When Epstein–Barr virus (EBV) infects a human B lymphocyte, it goes through three phases: the pre‐latent phase, latent phase, and lytic phase. Little is known about the viral and cellular m6A epitranscriptomes in EBV infection, especially in the pre‐latent phase during de novo infection. Methods Methylated RNA immunoprecipitation sequencing (MeRIP‐seq) and MeRIP‐RT‐qPCR were used to determine the m6A‐modified transcripts during de novo EBV infection. RIP assay was used to confirm the binding of EBNA2 and m6A readers. Quantitative reverse‐transcription polymerase chain reaction (RT‐qPCR) and Western blot analysis were performed to test the effect of m6A on the host and viral gene expression. Results Here, we provided mechanistic insights by examining the viral and cellular m6A epitranscriptomes during de novo EBV infection, which is in the pre‐latent phase. EBV EBNA2 and BHRF1 were highly m6A‐modified upon EBV infection. Knockdown of METTL3 (a “writer”) decreased EBNA2 expression levels. The emergent m6A modifications induced by EBV infection preferentially distributed in 3ʹ untranslated regions of cellular transcripts, while the lost m6A modifications induced by EBV infection preferentially distributed in coding sequence regions of mRNAs. EBV infection could influence the host cellular m6A epitranscriptome. Conclusions These results reveal the critical role of m6A modification in the process of de novo EBV infection.
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Affiliation(s)
- Xiang Zheng
- Hunan Cancer Hospital, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China.,Cancer Research Institute, Department of Microbiology, Department of Pathology, School of Basic Medical Science, Central South University, Changsha, Hunan, China.,Department of Pathology, Affiliated Hospital of Guilin Medical University, Guilin, Guangxi, China.,Hunan Key Laboratory of Nonresolving Inflammation and Cancer, NHC Key Laboratory of Carcinogenesis, Key Laboratory of Carcinogenesis and Cancer Invasion of Ministry of Education, Changsha, Hunan, China
| | - Jia Wang
- Hunan Cancer Hospital, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China.,Cancer Research Institute, Department of Microbiology, Department of Pathology, School of Basic Medical Science, Central South University, Changsha, Hunan, China.,Hunan Key Laboratory of Nonresolving Inflammation and Cancer, NHC Key Laboratory of Carcinogenesis, Key Laboratory of Carcinogenesis and Cancer Invasion of Ministry of Education, Changsha, Hunan, China.,Department of Immunology, Changzhi Medical College, Changzhi, Shanxi, China
| | - Xiaoyue Zhang
- Cancer Research Institute, Department of Microbiology, Department of Pathology, School of Basic Medical Science, Central South University, Changsha, Hunan, China.,Hunan Key Laboratory of Nonresolving Inflammation and Cancer, NHC Key Laboratory of Carcinogenesis, Key Laboratory of Carcinogenesis and Cancer Invasion of Ministry of Education, Changsha, Hunan, China
| | - Yuxin Fu
- Cancer Research Institute, Department of Microbiology, Department of Pathology, School of Basic Medical Science, Central South University, Changsha, Hunan, China
| | - Qiu Peng
- Cancer Research Institute, Department of Microbiology, Department of Pathology, School of Basic Medical Science, Central South University, Changsha, Hunan, China.,Hunan Key Laboratory of Nonresolving Inflammation and Cancer, NHC Key Laboratory of Carcinogenesis, Key Laboratory of Carcinogenesis and Cancer Invasion of Ministry of Education, Changsha, Hunan, China
| | - Jianhong Lu
- Cancer Research Institute, Department of Microbiology, Department of Pathology, School of Basic Medical Science, Central South University, Changsha, Hunan, China
| | - Lingyu Wei
- Cancer Research Institute, Department of Microbiology, Department of Pathology, School of Basic Medical Science, Central South University, Changsha, Hunan, China.,Hunan Key Laboratory of Nonresolving Inflammation and Cancer, NHC Key Laboratory of Carcinogenesis, Key Laboratory of Carcinogenesis and Cancer Invasion of Ministry of Education, Changsha, Hunan, China
| | - Zhengshuo Li
- Cancer Research Institute, Department of Microbiology, Department of Pathology, School of Basic Medical Science, Central South University, Changsha, Hunan, China.,Hunan Key Laboratory of Nonresolving Inflammation and Cancer, NHC Key Laboratory of Carcinogenesis, Key Laboratory of Carcinogenesis and Cancer Invasion of Ministry of Education, Changsha, Hunan, China
| | - Can Liu
- Cancer Research Institute, Department of Microbiology, Department of Pathology, School of Basic Medical Science, Central South University, Changsha, Hunan, China.,Hunan Key Laboratory of Nonresolving Inflammation and Cancer, NHC Key Laboratory of Carcinogenesis, Key Laboratory of Carcinogenesis and Cancer Invasion of Ministry of Education, Changsha, Hunan, China
| | - Yangge Wu
- Department of Pathology, Affiliated Hospital of Guilin Medical University, Guilin, Guangxi, China.,Hunan Key Laboratory of Nonresolving Inflammation and Cancer, NHC Key Laboratory of Carcinogenesis, Key Laboratory of Carcinogenesis and Cancer Invasion of Ministry of Education, Changsha, Hunan, China
| | - Qun Yan
- Department of Clinical Laboratory, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Jian Ma
- Hunan Cancer Hospital, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China.,Cancer Research Institute, Department of Microbiology, Department of Pathology, School of Basic Medical Science, Central South University, Changsha, Hunan, China.,Hunan Key Laboratory of Nonresolving Inflammation and Cancer, NHC Key Laboratory of Carcinogenesis, Key Laboratory of Carcinogenesis and Cancer Invasion of Ministry of Education, Changsha, Hunan, China
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33
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Zheng W, Xu Q, Zhang Y, E X, Gao W, Zhang M, Zhai W, Rajkumar RS, Liu Z. Toll-like receptor-mediated innate immunity against herpesviridae infection: a current perspective on viral infection signaling pathways. Virol J 2020; 17:192. [PMID: 33298111 PMCID: PMC7726878 DOI: 10.1186/s12985-020-01463-2] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Accepted: 12/01/2020] [Indexed: 12/12/2022] Open
Abstract
Background In the past decades, researchers have demonstrated the critical role of Toll-like receptors (TLRs) in the innate immune system. They recognize viral components and trigger immune signal cascades to subsequently promote the activation of the immune system. Main body Herpesviridae family members trigger TLRs to elicit cytokines in the process of infection to activate antiviral innate immune responses in host cells. This review aims to clarify the role of TLRs in the innate immunity defense against herpesviridae, and systematically describes the processes of TLR actions and herpesviridae recognition as well as the signal transduction pathways involved. Conclusions Future studies of the interactions between TLRs and herpesviridae infections, especially the subsequent signaling pathways, will not only contribute to the planning of effective antiviral therapies but also provide new molecular targets for the development of antiviral drugs.
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Affiliation(s)
- Wenjin Zheng
- School of Basic Medical Sciences, Weifang Medical University, Weifang, 261053, China
| | - Qing Xu
- School of Anesthesiology, Weifang Medical University, Weifang, 261053, China
| | - Yiyuan Zhang
- School of Basic Medical Sciences, Weifang Medical University, Weifang, 261053, China
| | - Xiaofei E
- Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, MA, 01605, USA
| | - Wei Gao
- Key Lab for Immunology in Universities of Shandong Province, School of Basic Medical Sciences, Weifang Medical University, Weifang, 261053, China
| | - Mogen Zhang
- School of Basic Medical Sciences, Weifang Medical University, Weifang, 261053, China
| | - Weijie Zhai
- School of Basic Medical Sciences, Weifang Medical University, Weifang, 261053, China
| | | | - Zhijun Liu
- Department of Medical Microbiology, School of Basic Medical Sciences, Weifang Medical University, Weifang, 261053, China.
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Zahid A, Ismail H, Li B, Jin T. Molecular and Structural Basis of DNA Sensors in Antiviral Innate Immunity. Front Immunol 2020; 11:613039. [PMID: 33329609 PMCID: PMC7734173 DOI: 10.3389/fimmu.2020.613039] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Accepted: 11/02/2020] [Indexed: 12/30/2022] Open
Abstract
DNA viruses are a source of great morbidity and mortality throughout the world by causing many diseases; thus, we need substantial knowledge regarding viral pathogenesis and the host’s antiviral immune responses to devise better preventive and therapeutic strategies. The innate immune system utilizes numerous germ-line encoded receptors called pattern-recognition receptors (PRRs) to detect various pathogen-associated molecular patterns (PAMPs) such as viral nucleic acids, ultimately resulting in antiviral immune responses in the form of proinflammatory cytokines and type I interferons. The immune-stimulatory role of DNA is known for a long time; however, DNA sensing ability of the innate immune system was unraveled only recently. At present, multiple DNA sensors have been proposed, and most of them use STING as a key adaptor protein to exert antiviral immune responses. In this review, we aim to provide molecular and structural underpinnings on endosomal DNA sensor Toll-like receptor 9 (TLR9) and multiple cytosolic DNA sensors including cyclic GMP-AMP synthase (cGAS), interferon-gamma inducible 16 (IFI16), absent in melanoma 2 (AIM2), and DNA-dependent activator of IRFs (DAI) to provide new insights on their signaling mechanisms and physiological relevance. We have also addressed less well-understood DNA sensors such as DEAD-box helicase DDX41, RNA polymerase III (RNA pol III), DNA-dependent protein kinase (DNA-PK), and meiotic recombination 11 homolog A (MRE11). By comprehensive understanding of molecular and structural aspects of DNA-sensing antiviral innate immune signaling pathways, potential new targets for viral and autoimmune diseases can be identified.
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Affiliation(s)
- Ayesha Zahid
- Department of Obstetrics and Gynecology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China.,Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Basic Medical Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Hazrat Ismail
- MOE Key Laboratory for Cellular Dynamics & Anhui Key Laboratory for Chemical Biology, CAS Center for Excellence in Molecular Cell Science, Hefei National Science Center for Physical Sciences at Microscale & University of Science and Technology of China, Hefei, China
| | - Bofeng Li
- Department of Obstetrics and Gynecology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China.,Department of Medical Oncology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Tengchuan Jin
- Department of Obstetrics and Gynecology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China.,Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Basic Medical Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China.,CAS Center for Excellence in Molecular Cell Science, Chinese Academy of Science, Shanghai, China
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TLR4 896A/G and TLR9 1174G/A polymorphisms are associated with the risk of infectious mononucleosis. Sci Rep 2020; 10:13154. [PMID: 32753695 PMCID: PMC7403730 DOI: 10.1038/s41598-020-70129-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Accepted: 07/21/2020] [Indexed: 02/06/2023] Open
Abstract
Toll-like receptors (TLRs) recognize pathogen-associated molecular patterns and activate innate and adaptive immune responses. Single nucleotide polymorphisms (SNPs) within the TLR genes may influence host–pathogen interactions and can have an impact on the progression of infectious diseases. The present study aimed to investigate the genotype distribution of TLR2 (2029C/T, rs121917864; 2258G/A, rs5743708), TLR4 (896A/G, rs4986790), and TLR9 (− 1237T/C, rs5743836; − 1486T/C, rs187084; 1174G/A, rs352139; and 2848C/T, rs352140) polymorphisms in 149 children and adolescents with infectious mononucleosis (IM) and 140 healthy individuals. The potential association of TLR SNPs with the clinical manifestations of EBV infection was also studied. The presence of TLR2, TLR4, and TLR9 SNPs was identified by polymerase chain reaction–restriction fragment length polymorphism (PCR–RFLP). EBV DNA loads were detected by quantitative real-time PCR assay. The TLR4 896 GG and the TLR9 1174 GA genotypes were associated with an increased risk of EBV-related IM in examined patients (p = 0.014 and p = 0.001, respectively). The heterozygous genotype of the TLR4 896A/G SNP was associated with an increased risk of elevated liver enzyme levels and leukocytosis (p < 0.05). Our preliminary study revealed that the TLR4 896A/G and the TLR9 1174G/A polymorphisms seem to be related to the course of acute EBV infection in children and adolescents.
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Plasmacytoid dendritic cells respond to Epstein-Barr virus infection with a distinct type I interferon subtype profile. Blood Adv 2020; 3:1129-1144. [PMID: 30952679 DOI: 10.1182/bloodadvances.2018025536] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Accepted: 02/24/2019] [Indexed: 12/15/2022] Open
Abstract
Infectious mononucleosis, caused by infection with the human gamma-herpesvirus Epstein-Barr virus (EBV), manifests with one of the strongest CD8+ T-cell responses described in humans. The resulting T-cell memory response controls EBV infection asymptomatically in the vast majority of persistently infected individuals. Whether and how dendritic cells (DCs) contribute to the priming of this near-perfect immune control remains unclear. Here we show that of all the human DC subsets, plasmacytoid DCs (pDCs) play a central role in the detection of EBV infection in vitro and in mice with reconstituted human immune system components. pDCs respond to EBV by producing the interferon (IFN) subtypes α1, α2, α5, α7, α14, and α17. However, the virus curtails this type I IFN production with its latent EBV gene products EBNA3A and EBNA3C. The induced type I IFNs inhibit EBV entry and the proliferation of latently EBV-transformed B cells but do not influence lytic reactivation of the virus in vitro. In vivo, exogenous IFN-α14 and IFN-α17, as well as pDC expansion, delay EBV infection and the resulting CD8+ T-cell expansion, but pDC depletion does not significantly influence EBV infection. Thus, consistent with the observation that primary immunodeficiencies compromising type I IFN responses affect only alpha- and beta-herpesvirus infections, we found that EBV elicits pDC responses that transiently suppress viral replication and attenuate CD8+ T-cell expansion but are not required to control primary infection.
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Chandler LC, Yusuf IH, McClements ME, Barnard AR, MacLaren RE, Xue K. Immunomodulatory Effects of Hydroxychloroquine and Chloroquine in Viral Infections and Their Potential Application in Retinal Gene Therapy. Int J Mol Sci 2020; 21:E4972. [PMID: 32674481 PMCID: PMC7404262 DOI: 10.3390/ijms21144972] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Revised: 07/02/2020] [Accepted: 07/09/2020] [Indexed: 12/25/2022] Open
Abstract
Effective treatment of retinal diseases with adeno-associated virus (AAV)-mediated gene therapy is highly dependent on the proportion of successfully transduced cells. However, due to inflammatory reactions at high vector doses, adjunctive treatment may be necessary to enhance the therapeutic outcome. Hydroxychloroquine and chloroquine are anti-malarial drugs that have been successfully used in the treatment of autoimmune diseases. Evidence suggests that at high concentrations, hydroxychloroquine and chloroquine can impact viral infection and replication by increasing endosomal and lysosomal pH. This effect has led to investigations into the potential benefits of these drugs in the treatment of viral infections, including human immunodeficiency virus and severe acute respiratory syndrome coronavirus-2. However, at lower concentrations, hydroxychloroquine and chloroquine appear to exert immunomodulatory effects by inhibiting nucleic acid sensors, including toll-like receptor 9 and cyclic GMP-AMP synthase. This dose-dependent effect on their mechanism of action supports observations of increased viral infections associated with lower drug doses. In this review, we explore the immunomodulatory activity of hydroxychloroquine and chloroquine, their impact on viral infections, and their potential to improve the efficacy and safety of retinal gene therapy by reducing AAV-induced immune responses. The safety and practicalities of delivering hydroxychloroquine into the retina will also be discussed.
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Affiliation(s)
- Laurel C. Chandler
- Nuffield Laboratory of Ophthalmology, Nuffield Department of Clinical Neurosciences & NIHR Oxford Biomedical Research Centre, University of Oxford, Oxford OX3 9DU, UK; (I.H.Y.); (M.E.M.); (A.R.B.); (R.E.M.)
- Oxford Eye Hospital, Oxford University Hospitals NHS Foundation Trust, Oxford OX3 9DU, UK
| | - Imran H. Yusuf
- Nuffield Laboratory of Ophthalmology, Nuffield Department of Clinical Neurosciences & NIHR Oxford Biomedical Research Centre, University of Oxford, Oxford OX3 9DU, UK; (I.H.Y.); (M.E.M.); (A.R.B.); (R.E.M.)
- Oxford Eye Hospital, Oxford University Hospitals NHS Foundation Trust, Oxford OX3 9DU, UK
| | - Michelle E. McClements
- Nuffield Laboratory of Ophthalmology, Nuffield Department of Clinical Neurosciences & NIHR Oxford Biomedical Research Centre, University of Oxford, Oxford OX3 9DU, UK; (I.H.Y.); (M.E.M.); (A.R.B.); (R.E.M.)
| | - Alun R. Barnard
- Nuffield Laboratory of Ophthalmology, Nuffield Department of Clinical Neurosciences & NIHR Oxford Biomedical Research Centre, University of Oxford, Oxford OX3 9DU, UK; (I.H.Y.); (M.E.M.); (A.R.B.); (R.E.M.)
- Oxford Eye Hospital, Oxford University Hospitals NHS Foundation Trust, Oxford OX3 9DU, UK
| | - Robert E. MacLaren
- Nuffield Laboratory of Ophthalmology, Nuffield Department of Clinical Neurosciences & NIHR Oxford Biomedical Research Centre, University of Oxford, Oxford OX3 9DU, UK; (I.H.Y.); (M.E.M.); (A.R.B.); (R.E.M.)
- Oxford Eye Hospital, Oxford University Hospitals NHS Foundation Trust, Oxford OX3 9DU, UK
| | - Kanmin Xue
- Nuffield Laboratory of Ophthalmology, Nuffield Department of Clinical Neurosciences & NIHR Oxford Biomedical Research Centre, University of Oxford, Oxford OX3 9DU, UK; (I.H.Y.); (M.E.M.); (A.R.B.); (R.E.M.)
- Oxford Eye Hospital, Oxford University Hospitals NHS Foundation Trust, Oxford OX3 9DU, UK
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How Does Epstein-Barr Virus Contribute to Chronic Periodontitis? Int J Mol Sci 2020; 21:ijms21061940. [PMID: 32178406 PMCID: PMC7139403 DOI: 10.3390/ijms21061940] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 03/10/2020] [Accepted: 03/10/2020] [Indexed: 12/21/2022] Open
Abstract
Chronic periodontitis is spreading worldwide and mutually interacts with systemic diseases like diabetes mellitus. Although periodontopathic bacteria are inevitable pathogens in their onset and progression, many cases are not ascribable to the virulence of these bacteria because the effect of plaque control is limited. In contrast, Epstein-Barr virus (EBV) in the periodontium has been correlated with chronic periodontitis and has recently been considered as a promising pathogenic candidate for this disease. However, several important questions have yet to be addressed. For instance, although EBV latently infects more than 90% of individuals over the world, why do patients with chronic periodontitis exclusively harbor progeny EBV in the oral cavity? In addition, how does latently infected or reactivated EBV in the periodontium relate to the onset or progression of chronic periodontitis? Finally, is periodontitis incurable because EBV is the pathogen for chronic periodontitis? In this review, we attempt to answer these questions by reporting the current understanding of molecular relations and mechanisms between periodontopathic bacteria and EBV reactivation in the context of how this relationship may pertain to the etiology of chronic periodontitis.
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PECULIARITIES OF TLR9 EXPRESSION ON IMMUNE COMPETENT CELLS IN REACTIVE ARTHRITIS PATIENTS WITH CHRONIC EPSTEIN-BARR VIRUS INFECTION. WORLD OF MEDICINE AND BIOLOGY 2020. [DOI: 10.26724/2079-8334-2020-1-71-83-88] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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40
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Functional Polymorphisms and Gene Expression of TLR9 Gene as Protective Factors for Nasopharyngeal Carcinoma Severity and Progression. J Immunol Res 2019; 2019:2826563. [PMID: 31886298 PMCID: PMC6899320 DOI: 10.1155/2019/2826563] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Revised: 09/06/2019] [Accepted: 10/15/2019] [Indexed: 12/12/2022] Open
Abstract
Nasopharyngeal carcinoma (NPC) is a disease that is closely associated with EBV infection. Toll-like receptor 9 is an important factor mediating the interaction between EBV and the host immune response. Any genetic (single nucleotide polymorphisms, SNPs) or expression variation in TLR9 gene may modify the ability of the receptor to respond correctly to viral infection as in NPC. This study is aimed at evaluating the effect of TLR9 functional polymorphisms (TLR9-1486 T/C and TLR9-1237 T/C) and TLR9 mRNA expression in NPC severity and progression at diagnosis and after treatment. This study included 322 patients with NPC. RFLP-PCR and real-time PCR were used to assess, respectively, the genotypes and the mRNA expression of TLR9 gene. The genotyping analysis showed that the presence of mutated allele -1237C (TLR9-1237 TC+CC) was associated with large tumor size (p = 0.017; OR (CI 95%) = 1.888 (1.11-3.19)) at diagnosis. After treatment, the -1237C allele was associated with a better chance of complete remission (p = 0.031, OR (CI 95%) = 0.486 (0.25-0.95)), a lower risk of distant metastasis (p = 0.028, OR (CI 95%) = 0.435 (0.18-1.02)), and a lower risk of death by NPC (p = 0.003, OR (CI 95%) = 0.20 (0.06-0.67)). Kaplan-Meier analysis showed that patients with -1237CC and -1237TC genotypes had a better overall survival (OVS) (p < 0.01) and distant metastasis-free survival (DMFS) (p < 0.05). A multivariate analysis revealed that TLR9-1237 T/C polymorphism was an independent prognostic factor in OVS (p = 0.02; HR = 0.244) and DMFS (p = 0.048; HR = 0.388). The transcriptomic analysis showed that the mRNA expression was reduced in patients with larger tumor size (T4) (p = 0.013) and advanced clinical stage (SIII-SIV) (p = 0.037). The TLR9 mRNA expression was inversely correlated with tumor size (p = 0.014; r = −0.314) at diagnosis. Our results indicated for the first time that the functional -1237 T/C polymorphism and mRNA expression of TLR9 gene may be considered as protective factors for NPC severity and progression.
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Zyzak J, Mitkiewicz M, Leszczyńska E, Reniewicz P, Moynagh PN, Siednienko J. HSV-1/TLR9-Mediated IFNβ and TNFα Induction Is Mal-Dependent in Macrophages. J Innate Immun 2019; 12:387-398. [PMID: 31851971 DOI: 10.1159/000504542] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 10/31/2019] [Indexed: 11/19/2022] Open
Abstract
Innate immune response is a universal mechanism against invading pathogens. Toll-like receptors (TLRs), being part of a first line of defense, are responsible for detecting a variety of microorganisms. Among them TLR9, which is localized in endosomes, acts as a sensor for unmethylated CpG motifs present in bacteria, DNA viruses (e.g., HSV-1), or fungi. TLRs differ from one another by the use of accessory proteins. MyD88 adapter-like (Mal) adapter molecule is considered a positive regulator of TLR2- and TLR4-dependent pathways. It has been reported that this adapter may also negatively control signal transduction induced by TLR3 anchored in the endosome membrane. So far, the role of Mal adapter protein in the TLR9 signaling pathways has not been clarified. We show for the first time that Mal is engaged in TLR9-de-pendent expression of genes encoding IFNβ and TNFα in HSV-1-infected or CpG-C-treated macrophages and requires a noncanonical NF-κB pathway. Moreover, using inhibitor of ERK1/2 we confirmed involvement of these kinases in TLR9-dependent induction of IFNβ and TNFα. Our study points to a new role of Mal in TLR9 signaling through a hitherto unknown mechanism whereby lack of Mal specifically impairs ERK1/2-mediated induction of noncanonical NF-κB pathway and concomitant IFNβ and TNFα production.
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Affiliation(s)
- Joanna Zyzak
- Laboratory of Microbiome Immunobiology, Ludwik Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Wroclaw, Poland.,Łukasiewicz Research Network - PORT Polish Center for Technology Development, Wroclaw, Poland
| | - Małgorzata Mitkiewicz
- Laboratory of Microbiome Immunobiology, Ludwik Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Wroclaw, Poland
| | - Ewa Leszczyńska
- Laboratory of Microbiome Immunobiology, Ludwik Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Wroclaw, Poland.,Łukasiewicz Research Network - PORT Polish Center for Technology Development, Wroclaw, Poland
| | - Patryk Reniewicz
- Laboratory of Microbiome Immunobiology, Ludwik Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Wroclaw, Poland.,Łukasiewicz Research Network - PORT Polish Center for Technology Development, Wroclaw, Poland
| | - Paul N Moynagh
- Institute of Immunology, Department of Biology, Maynooth University, Maynooth, Ireland
| | - Jakub Siednienko
- Laboratory of Microbiome Immunobiology, Ludwik Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Wroclaw, Poland, .,Łukasiewicz Research Network - PORT Polish Center for Technology Development, Wroclaw, Poland,
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Immune Control and Vaccination against the Epstein-Barr Virus in Humanized Mice. Vaccines (Basel) 2019; 7:vaccines7040217. [PMID: 31861045 PMCID: PMC6963577 DOI: 10.3390/vaccines7040217] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Revised: 12/12/2019] [Accepted: 12/14/2019] [Indexed: 12/12/2022] Open
Abstract
Mice with reconstituted human immune system components (humanized mice) offer the unique opportunity to test vaccines preclinically in the context of vaccine adjuvant sensing by human antigen presenting cells and priming of human cytotoxic lymphocyte populations. These features are particularly attractive for immune control of the Epstein–Barr virus (EBV), which represents the most potent growth-transforming pathogen in man and exclusively relies on cytotoxic lymphocytes for its asymptomatic persistence in the vast majority of healthy virus carriers. This immune control is particularly impressive because EBV infects more than 95% of the human adult population and persists without pathology for more than 50 years in most of them. This review will discuss the pathologies that EBV elicits in humanized mice, which immune responses control it in this model, as well as which passive and active vaccination schemes with adoptive T cell transfer and with virus-like particles or individual antigens, respectively, have been explored in this model so far. EBV-specific CD8+ T cell priming in humanized mice could provide crucial insights into how cytotoxic lymphocytes against other viruses and tumors might be elicited by vaccination in humans.
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The Role of Dendritic Cells in Immune Control and Vaccination against -Herpesviruses. Viruses 2019; 11:v11121125. [PMID: 31817510 PMCID: PMC6950272 DOI: 10.3390/v11121125] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 11/29/2019] [Accepted: 12/04/2019] [Indexed: 12/21/2022] Open
Abstract
The two human oncogenic -herpesviruses, Epstein Barr virus (EBV) and Kaposi sarcoma-associated herpesvirus (KSHV), are prototypic pathogens that are controlled by T cell responses. Despite their ubiquitous distribution, persistent infections and transforming potential, most carriers' immune systems control them for life. Therefore, they serve as paradigms of how near-perfect cell-mediated immune control can be initiated and maintained for decades. Interestingly, EBV especially quite efficiently avoids dendritic cell (DC) activation, and little evidence exists that these most potent antigen-presenting cells of the human body are involved in the priming of immune control against this tumor virus. However, DCs can be harnessed therapeutically to expand virus-specific T cells for adoptive transfer therapy of patients with virus-associated malignancies and are also currently explored for vaccinations. Unfortunately, despite 55 and 25 years of research on EBV and KSHV, respectively, the priming of their immune control that belongs to the most robust and durable immune responses in humans still remains unclear.
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Zentsova I, Parackova Z, Kayserova J, Palova-Jelinkova L, Vrabcova P, Volfova N, Sumnik Z, Pruhova S, Petruzelkova L, Sediva A. Monocytes contribute to DNA sensing through the TBK1 signaling pathway in type 1 diabetes patients. J Autoimmun 2019; 105:102294. [DOI: 10.1016/j.jaut.2019.06.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 06/13/2019] [Accepted: 06/14/2019] [Indexed: 12/22/2022]
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Carriere J, Rao Y, Liu Q, Lin X, Zhao J, Feng P. Post-translational Control of Innate Immune Signaling Pathways by Herpesviruses. Front Microbiol 2019; 10:2647. [PMID: 31798565 PMCID: PMC6868034 DOI: 10.3389/fmicb.2019.02647] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 10/30/2019] [Indexed: 12/21/2022] Open
Abstract
Herpesviruses constitute a large family of disease-causing DNA viruses. Each herpesvirus strain is capable of infecting particular organisms with a specific cell tropism. Upon infection, pattern recognition receptors (PRRs) recognize conserved viral features to trigger signaling cascades that culminate in the production of interferons and pro-inflammatory cytokines. To invoke a proper immune response while avoiding collateral tissue damage, signaling proteins involved in these cascades are tightly regulated by post-translational modifications (PTMs). Herpesviruses have developed strategies to subvert innate immune signaling pathways in order to ensure efficient viral replication and achieve persistent infection. The ability of these viruses to control the proteins involved in these signaling cascades post-translationally, either directly via virus-encoded enzymes or indirectly through the deregulation of cellular enzymes, has been widely reported. This ability provides herpesviruses with a powerful tool to shut off or restrict host antiviral and inflammatory responses. In this review, we highlight recent findings on the herpesvirus-mediated post-translational control along PRR-mediated signaling pathways.
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Affiliation(s)
| | | | | | | | | | - Pinghui Feng
- Section of Infection and Immunity, Ostrow School of Dentistry, University of Southern California, Los Angeles, CA, United States
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Endosomal Toll-Like Receptors Mediate Enhancement of Interleukin-17A Production Triggered by Epstein-Barr Virus DNA in Mice. J Virol 2019; 93:JVI.00987-19. [PMID: 31375581 DOI: 10.1128/jvi.00987-19] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Accepted: 07/18/2019] [Indexed: 01/03/2023] Open
Abstract
We previously demonstrated that Epstein-Barr virus (EBV) DNA increases the production of the proinflammatory cytokine interleukin-17A (IL-17A) in mice. This property may contribute to the established association between EBV and autoimmune diseases. The objective of the present study was to elucidate mechanisms through which EBV DNA modulates IL-17A levels in mice. To determine whether endosomal Toll-like receptors (TLRs) played a role in this pathway, the expression of TLR3, -7, or -9 was assessed by real-time reverse transcription-PCR in mouse spleens after injection of EBV DNA. Moreover, specific inhibitors were used for these TLRs in mouse peripheral blood mononuclear cells (PBMCs) cultured with EBV DNA and in mice injected with this viral DNA; IL-17A levels were then assessed using an enzyme-linked immunosorbent assay. The expression of the endosomal receptors TLR3, -7, and -9 was increased in mice injected with EBV DNA. When mouse immune cells were cultured with EBV DNA and a TLR3, -7, or -9 inhibitor or when mice were injected with the viral DNA along with either of these inhibitors, a significant decrease in IL-17A levels was detected. Therefore, endosomal TLRs are involved in the EBV DNA-mediated triggering of IL-17A production in mice. Targeting these receptors in EBV-positive subjects with autoimmunity may be useful pending investigations assessing whether they play a similar role in humans.IMPORTANCE Epstein-Barr virus is a pathogen that causes persistent infection with potential consistent viral DNA shedding. The enhancement of production of proinflammatory cytokines by viral DNA itself may contribute to autoimmune disease development or exacerbation. In this project, we identified that endosomal Toll-like receptors are involved in triggering proinflammatory mediators in response to viral DNA. Pathways and receptors involved may serve as future therapeutic targets for autoimmune diseases such as rheumatoid arthritis, multiple sclerosis, and systemic lupus erythematosus.
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Epstein-Barr Virus and Innate Immunity: Friends or Foes? Microorganisms 2019; 7:microorganisms7060183. [PMID: 31238570 PMCID: PMC6617214 DOI: 10.3390/microorganisms7060183] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 06/20/2019] [Accepted: 06/22/2019] [Indexed: 12/16/2022] Open
Abstract
Epstein–Barr virus (EBV) successfully persists in the vast majority of adults but causes lymphoid and epithelial malignancies in a small fraction of latently infected individuals. Innate immunity is the first-line antiviral defense, which EBV has to evade in favor of its own replication and infection. EBV uses multiple strategies to perturb innate immune signaling pathways activated by Toll-like, RIG-I-like, NOD-like, and AIM2-like receptors as well as cyclic GMP-AMP synthase. EBV also counteracts interferon production and signaling, including TBK1-IRF3 and JAK-STAT pathways. However, activation of innate immunity also triggers pro-inflammatory response and proteolytic cleavage of caspases, both of which exhibit proviral activity under some circumstances. Pathogenic inflammation also contributes to EBV oncogenesis. EBV activates NFκB signaling and induces pro-inflammatory cytokines. Through differential modulation of the proviral and antiviral roles of caspases and other host factors at different stages of infection, EBV usurps cellular programs for death and inflammation to its own benefits. The outcome of EBV infection is governed by a delicate interplay between innate immunity and EBV. A better understanding of this interplay will instruct prevention and intervention of EBV-associated cancers.
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Abstract
DNA viruses are linked to many infectious diseases and contribute significantly to human morbidity and mortality worldwide. Moreover, DNA viral infections are usually lifelong and hard to eradicate. Under certain circumstances, these viruses can cause fatal disease, especially in children and immunocompromised patients. An efficient innate immune response against these viruses is critical, not only as the first line of host defense against viral infection but also for mounting more specific and robust adaptive immunity against the virus. Recognition of the viral DNA genome is the very first step of this whole process and is crucial for understanding viral pathogenesis as well as for preventing and treating DNA virus-associated diseases. This review focuses on the current state of our knowledge on how human DNA viruses are sensed by the host innate immune system and how viral proteins counteract this immune response.
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Affiliation(s)
- Zhe Ma
- Lineberger Comprehensive Cancer Center and Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA;
| | - Guoxin Ni
- Lineberger Comprehensive Cancer Center and Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA;
| | - Blossom Damania
- Lineberger Comprehensive Cancer Center and Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA;
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Lv S, Li S, Wang Z, Xia J. Imbalance in the ratio of CpG and polyG contributes to impaired interferon-α expression. J Med Virol 2019; 91:1148-1157. [PMID: 30701565 DOI: 10.1002/jmv.25419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Revised: 01/03/2019] [Accepted: 01/27/2019] [Indexed: 11/07/2022]
Abstract
The secretion of interferon-α (IFN-α) is impaired during hepatitis B virus (HBV) infection. DNA sequences purified from distinct viruses, for example, HBV versus members of Herpesviridae, have been shown to differ in their IFN-α signaling properties. The present study found that DNA from HBV inhibited, while DNA from members of Herpesviridae induced, the expression of IFN-α. Furthermore, stimulatory cytosine-phosphate-guanosine (CpG) sequences derived from these DNA viruses could induce the secretion of IFN-α, while inhibitory guanosine-rich oligodeoxynucleoti (polyG) oligonucleotide sequences derived from these DNA viruses could inhibit CpG-induced IFN-α secretion. Using a computational analysis of genomic DNA sequences, the discrimination between the genomes of HBV and those of other DNA viruses that can also cause inflammation of the liver is based on different frequencies of the CpG and polyG motifs. The underrepresentation of stimulatory CpG motifs and overrepresentation of inhibitory polyG motifs were documented in HBV genomes, whereas the DNA from other viral genomes displayed the opposite trend. Moreover, it was demonstrated that HBV could suppress the activation of IFN-α via its own DNA through the high proportion of polyG motifs. To our knowledge, this is the first demonstration of a specific role for polyG motifs in the inhibition of the IFN-α response following DNA virus infection.
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Affiliation(s)
- Shujuan Lv
- Department of Microbiology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China
| | - Suping Li
- Blood Test and Identification Laboratory, Blood Transfusion Institute, Anhui Blood Center, Hefei, China
| | - Zifeng Wang
- Department of Microbiology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China
| | - Jing Xia
- Department of Microbiology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China
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Bussey KA, Murthy S, Reimer E, Chan B, Hatesuer B, Schughart K, Glaunsinger B, Adler H, Brinkmann MM. Endosomal Toll-Like Receptors 7 and 9 Cooperate in Detection of Murine Gammaherpesvirus 68 Infection. J Virol 2019; 93:e01173-18. [PMID: 30429335 PMCID: PMC6340039 DOI: 10.1128/jvi.01173-18] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 11/02/2018] [Indexed: 12/13/2022] Open
Abstract
Murine gammaherpesvirus 68 (MHV68) is a small-animal model suitable for study of the human pathogens Epstein-Barr virus and Kaposi's sarcoma-associated herpesvirus. Here, we have characterized the roles of the endosomal Toll-like receptor (TLR) escort protein UNC93B, endosomal TLR7, -9, and -13, and cell surface TLR2 in MHV68 detection. We found that the alpha interferon (IFN-α) response of plasmacytoid dendritic cells (pDC) to MHV68 was reduced in Tlr9-/- cells compared to levels in wild type (WT) cells but not completely lost. Tlr7-/- pDC responded similarly to WT. However, we found that in Unc93b-/- pDC, as well as in Tlr7-/-Tlr9-/- double-knockout pDC, the IFN-α response to MHV68 was completely abolished. Thus, the only pattern recognition receptors contributing to the IFN-α response to MHV68 in pDC are TLR7 and TLR9, but the contribution of TLR7 is masked by the presence of TLR9. To address the role of UNC93B and TLR for MHV68 infection in vivo, we infected mice with MHV68. Lytic replication of MHV68 after intravenous infection was enhanced in the lungs, spleen, and liver of UNC93B-deficient mice, in the spleen of TLR9-deficient mice, and in the liver and spleen of Tlr7-/-Tlr9-/- mice. The absence of TLR2 or TLR13 did not affect lytic viral titers. We then compared reactivation of MHV68 from latently infected WT, Unc93b-/-, Tlr7-/-Tlr9-/-, Tlr7-/-, and Tlr9-/- splenocytes. We observed enhanced reactivation and latent viral loads, particularly from Tlr7-/-Tlr9-/- splenocytes compared to levels in the WT. Our data show that UNC93B-dependent TLR7 and TLR9 cooperate in and contribute to detection and control of MHV68 infection.IMPORTANCE The two human gammaherpesviruses, Epstein-Barr virus (EBV) and Kaposi's sarcoma-associated herpesvirus (KSHV), can cause aggressive forms of cancer. These herpesviruses are strictly host specific, and therefore the homolog murine gammaherpesvirus 68 (MHV68) is a widely used model to obtain in vivo insights into the interaction between these two gammaherpesviruses and their host. Like EBV and KSHV, MHV68 establishes lifelong latency in B cells. The innate immune system serves as one of the first lines of host defense, with pattern recognition receptors such as the Toll-like receptors playing a crucial role in mounting a potent antiviral immune response to various pathogens. Here, we shed light on a yet unanticipated role of Toll-like receptor 7 in the recognition of MHV68 in a subset of immune cells called plasmacytoid dendritic cells, as well as on the control of this virus in its host.
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Affiliation(s)
- Kendra A Bussey
- Institute of Genetics, Technische Universität Braunschweig, Braunschweig, Germany
- Viral Immune Modulation Research Group, Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - Sripriya Murthy
- Viral Immune Modulation Research Group, Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - Elisa Reimer
- Viral Immune Modulation Research Group, Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - Baca Chan
- Viral Immune Modulation Research Group, Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - Bastian Hatesuer
- Department of Infection Genetics, Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - Klaus Schughart
- Department of Infection Genetics, Helmholtz Centre for Infection Research, Braunschweig, Germany
- University of Veterinary Medicine Hannover, Hannover, Germany
- Department of Microbiology, Immunology, and Biochemistry, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Britt Glaunsinger
- Department of Plant and Microbial Biology, University of California Berkeley, Howard Hughes Medical Institute, Berkeley, California, USA
| | - Heiko Adler
- Comprehensive Pneumology Center, Research Unit Lung Repair and Regeneration, Helmholtz Zentrum München-German Research Center for Environmental Health, German Center of Lung Research, Munich, Germany
| | - Melanie M Brinkmann
- Institute of Genetics, Technische Universität Braunschweig, Braunschweig, Germany
- Viral Immune Modulation Research Group, Helmholtz Centre for Infection Research, Braunschweig, Germany
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