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Wang Z, Liu N, Yang Y, Tu Z. The novel mechanism facilitating chronic hepatitis B infection: immunometabolism and epigenetic modification reprogramming. Front Immunol 2024; 15:1349867. [PMID: 38288308 PMCID: PMC10822934 DOI: 10.3389/fimmu.2024.1349867] [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: 12/05/2023] [Accepted: 01/02/2024] [Indexed: 01/31/2024] Open
Abstract
Hepatitis B Virus (HBV) infections pose a global public health challenge. Despite extensive research on this disease, the intricate mechanisms underlying persistent HBV infection require further in-depth elucidation. Recent studies have revealed the pivotal roles of immunometabolism and epigenetic reprogramming in chronic HBV infection. Immunometabolism have identified as the process, which link cell metabolic status with innate immunity functions in response to HBV infection, ultimately contributing to the immune system's inability to resolve Chronic Hepatitis B (CHB). Within hepatocytes, HBV replication leads to a stable viral covalently closed circular DNA (cccDNA) minichromosome located in the nucleus, and epigenetic modifications in cccDNA enable persistence of infection. Additionally, the accumulation or depletion of metabolites not only directly affects the function and homeostasis of immune cells but also serves as a substrate for regulating epigenetic modifications, subsequently influencing the expression of antiviral immune genes and facilitating the occurrence of sustained HBV infection. The interaction between immunometabolism and epigenetic modifications has led to a new research field, known as metabolic epigenomics, which may form a mutually reinforcing relationship with CHB. Herein, we review the recent studies on immunometabolism and epigenetic reprogramming in CHB infection and discuss the potential mechanisms of persistent HBV infection. A deeper understanding of these mechanisms will offer novel insights and targets for intervention strategies against chronic HBV infection, thereby providing new hope for the treatment of related diseases.
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Affiliation(s)
- Zhengmin Wang
- Department of Hepatology, The First Hospital of Jilin University, Changchun, Jilin, China
| | - Nan Liu
- Institute of Epigenetic Medicine, First Hospital of Jilin University, Changchun, China
| | - Yang Yang
- Department of Hepatology, The First Hospital of Jilin University, Changchun, Jilin, China
| | - Zhengkun Tu
- Department of Hepatology, The First Hospital of Jilin University, Changchun, Jilin, China
- Institute of Liver Diseases, The First Hospital of Jilin University, Changchun, Jilin, China
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Krzikalla D, Laschtowitz A, Leypoldt L, Gottwick C, Averhoff P, Weidemann S, Lohse AW, Huber S, Schramm C, Schwinge D, Herkel J, Carambia A. IFNγ and CTLA-4 Drive Hepatic CD4 T-Cell Tolerance and Protection From Autoimmunity in Mice. Cell Mol Gastroenterol Hepatol 2023; 17:79-91. [PMID: 37734595 PMCID: PMC10665921 DOI: 10.1016/j.jcmgh.2023.09.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 09/08/2023] [Accepted: 09/12/2023] [Indexed: 09/23/2023]
Abstract
BACKGROUND & AIMS The liver has a distinct capacity to induce immune tolerance to hepatic antigens. Although liver tolerance can be advantageous for preventing autoimmune and inflammatory diseases, it also can be detrimental by preventing immune surveillance of infected or malignant cells. Here, we investigated the immune mechanisms that establish hepatic tolerance. METHODS Tolerance was investigated in C-reactive protein (CRP)-myelin basic protein (MBP) mice expressing the neuroantigen MBP in hepatocytes, providing profound resistance to MBP-induced neuroinflammation. Tolerance induction was studied after transfer of MBP-specific CD4 T cells into CRP-MBP mice, and tolerance mechanisms were tested using depleting or blocking antibodies. RESULTS Although tolerant CRP-MBP mice display increased numbers of forkhead box P3+ regulatory T cells, we here found them not essential for the maintenance of hepatic tolerance. Instead, upon MBP recognition in the liver, MBP-specific T cells became activated to produce interferon (IFN)γ, which, in turn, induced local up-regulation of recruitment molecules, including Chemokine (C-X-C motif) ligand9 and its receptor C-X-C motif chemokine receptor3, facilitating endothelial translocation and redirection of MBP-specific T cells into the hepatic parenchyma. There, the translocated MBP-specific CD4 T cells partly converted into interleukin 10-producing type 1 regulatory T cells, and significantly up-regulated the expression of immune checkpoint molecules, notably cytotoxic T-lymphocyte-associated protein 4 (CTLA-4). Intriguingly, although liver tolerance was not affected by impairment of interleukin 10 signaling, concomitant blockade of IFNγ and CTLA-4 abrogated hepatic tolerance induction to MBP, resulting in neuroinflammatory autoimmune disease in these mice. CONCLUSIONS IFNγ-mediated redirection of autoreactive CD4 T cells into the liver and up-regulation of checkpoint molecules, including CTLA-4, were essential for tolerance induction in the liver, hence representing a potential treatment target for boosting or preventing liver tolerance.
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Affiliation(s)
- Daria Krzikalla
- Department of Medicine I, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Alena Laschtowitz
- Department of Medicine I, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Lisa Leypoldt
- Department of Medicine I, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Cornelia Gottwick
- Department of Medicine I, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Pia Averhoff
- Department of Medicine I, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Sören Weidemann
- Department of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Ansgar W Lohse
- Department of Medicine I, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; Hamburg Center for Translational Immunology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Samuel Huber
- Department of Medicine I, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; Hamburg Center for Translational Immunology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Christoph Schramm
- Department of Medicine I, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; Hamburg Center for Translational Immunology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; Martin Zeitz Center for Rare Diseases, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Dorothee Schwinge
- Department of Medicine I, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; Hamburg Center for Translational Immunology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Johannes Herkel
- Department of Medicine I, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; Hamburg Center for Translational Immunology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
| | - Antonella Carambia
- Department of Medicine I, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; Hamburg Center for Translational Immunology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
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Hillaire MLB, Lawrence P, Lagrange B. IFN-γ: A Crucial Player in the Fight Against HBV Infection? Immune Netw 2023; 23:e30. [PMID: 37670813 PMCID: PMC10475827 DOI: 10.4110/in.2023.23.e30] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 05/04/2023] [Accepted: 05/21/2023] [Indexed: 09/07/2023] Open
Abstract
About 0.8 million people die because of hepatitis B virus (HBV) infection each year. In around 5% of infected adults, the immune system is ineffective in countering HBV infection, leading to chronic hepatitis B (CHB). CHB is associated with hepatocellular carcinoma, which can lead to patient death. Unfortunately, although current treatments against CHB allow control of HBV infection, they are unable to achieve complete eradication of the virus. Cytokines of the IFN family represent part of the innate immune system and are key players in virus elimination. IFN secretion induces the expression of interferon stimulated genes, producing proteins that have antiviral properties and that are essential to cell-autonomous immunity. IFN-α is commonly used as a therapeutic approach for CHB. In addition, IFN-γ has been identified as the main IFN family member responsible for HBV eradication during acute infection. In this review, we summarize the key evidence gained from cellular or animal models of HBV replication or infection concerning the potential anti-HBV roles of IFN-γ with a particular focus on some IFN-γ-inducible genes.
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Affiliation(s)
| | - Philip Lawrence
- Confluence: Sciences et Humanités (EA 1598), Université Catholique de Lyon, Lyon, France
| | - Brice Lagrange
- Confluence: Sciences et Humanités (EA 1598), Université Catholique de Lyon, Lyon, France
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Immunopathogenesis of Acute Flare of Chronic Hepatitis B: With Emphasis on the Role of Cytokines and Chemokines. Int J Mol Sci 2022; 23:ijms23031407. [PMID: 35163330 PMCID: PMC8835919 DOI: 10.3390/ijms23031407] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Revised: 01/22/2022] [Accepted: 01/25/2022] [Indexed: 11/17/2022] Open
Abstract
Acute flares (AFs) of chronic hepatitis B usually occur during the immune-active stage (both immune clearance phase and immune reactivation phase), as the host immune system tries to control the virus. Successful host immune control over viral replication is usually presented as hepatitis B surface antigen seroclearance; however, 20–30% individuals with chronic hepatitis B may encounter repeated AFs with accumulative liver injuries, finally leading to the development of cirrhosis and hepatocellular carcinoma. AF can also develop in other clinical situations such as organ transplantation, cancer chemotherapy, and under treatment for chronic hepatitis B or treatment for chronic hepatitis C in patients with co-infected hepatitis B/hepatitis C. Understanding the natural history and immunopathogenesis of AF would help develop effective strategies to eradicate the virus and improve the clinical outcomes of patients with chronic hepatitis B. In this review article, the immunopathogenesis of AF, and the involvement of innate and adaptive immune responses on the development of hepatitis B flare will be briefly reviewed, with the emphasis on the role of cytokines and chemokines.
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Philips CA, Ahamed R, Abduljaleel JK, Rajesh S, Augustine P. Critical Updates on Chronic Hepatitis B Virus Infection in 2021. Cureus 2021; 13:e19152. [PMID: 34733599 PMCID: PMC8557099 DOI: 10.7759/cureus.19152] [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] [Accepted: 10/30/2021] [Indexed: 02/06/2023] Open
Abstract
Chronic hepatitis B virus (HBV) infection is a global healthcare burden in the form of chronic liver disease, cirrhosis, liver failure and liver cancer. There is no definite cure for the virus and even though extensive vaccination programs have reduced the burden of liver disease in the future population, treatment options to eradicate the virus from the host are still lacking. In this review, we discuss in detail current updates on the structure and applied biology of the virus in the host, examine updates to current treatment and explore novel and state-of-the-art therapeutics in the pipeline for management of chronic HBV. Furthermore, we also specifically review clinical updates on HBV-related acute on chronic liver failure (ACLF). Current treatments for chronic HBV infection have seen important updates in the form of considerations for treating patients in the immune tolerant phase and some clarity on end points for treatment and decisions on finite therapy with nucleos(t)ide inhibitors. Ongoing cutting-edge research on HBV biology has helped us identify novel target areas in the life cycle of the virus for application of new therapeutics. Due to improvements in the area of genomics, the hope for therapeutic vaccines, vector-based treatments and focused management aimed at targeting host integration of the virus and thereby a total cure could become a reality in the near future. Newer clinical prognostic tools have improved our understanding of timing of specific treatment options for the catastrophic syndrome of ACLF secondary to reactivation of HBV. In this review, we discuss in detail pertinent updates regarding virus biology and novel therapeutic targets with special focus on the appraisal of prognostic scores and treatment options in HBV-related ACLF.
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Affiliation(s)
- Cyriac A Philips
- Clinical and Translational Hepatology, The Liver Institute, Rajagiri Hospital, Aluva, IND
| | - Rizwan Ahamed
- Gastroenterology and Advanced Gastrointestinal Endoscopy, Center of Excellence in Gastrointestinal Sciences, Rajagiri Hospital, Aluva, IND
| | - Jinsha K Abduljaleel
- Gastroenterology and Advanced Gastrointestinal Endoscopy, Center of Excellence in Gastrointestinal Sciences, Rajagiri Hospital, Aluva, IND
| | - Sasidharan Rajesh
- Diagnostic and Interventional Radiology, Center of Excellence in Gastrointestinal Sciences, Rajagiri Hospital, Aluva, IND
| | - Philip Augustine
- Gastroenterology and Advanced Gastrointestinal Endoscopy, Center of Excellence in Gastrointestinal Sciences, Rajagiri Hospital, Aluva, IND
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Yuan G, Chen B, Meng Y, Lu J, Shi X, Hu A, Hu Y, Wang D. Role of the CXCR3‑mediated TLRs/MyD88 signaling pathway in promoting the development of hepatitis B into cirrhosis and liver cancer. Mol Med Rep 2021; 24:738. [PMID: 34435646 PMCID: PMC8404096 DOI: 10.3892/mmr.2021.12378] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Accepted: 05/18/2021] [Indexed: 12/14/2022] Open
Abstract
Chronic hepatitis B can lead to liver cirrhosis and primary hepatocellular carcinoma. The present study aimed to investigate whether C‑X‑C motif chemokine receptor 3 (CXCR3) regulates the genes in Toll‑like receptors (TLRs)/myeloid differentiation primary response protein 88 (MyD88) signaling pathway in the development of hepatitis B into cirrhosis and liver cancer in vitro. A hepatitis B virus (HBV) overexpression lentivirus was constructed and infected into a LX‑2 cell line to obtain stable HBV‑overexpressing cells (named HBV‑LX‑2 cells). The CXCR3 gene was knocked down using small interfering RNA in HBV‑LX‑2 cells. Cell Counting Kit‑8 assays, cell scratch tests and flow cytometry were used to detect cell proliferation, migration and apoptosis, respectively. The levels of IL‑1β and IL‑6 in serum samples of patients with liver cancer were measured via ELISA, and the collagen content in liver cancer tissues was detected using Masson staining. Western blotting was used to detect the expression levels of proteins in the TLRs/MyD88 signaling pathway. Excessive fibrosis was identified in the liver cancer tissues, and the serum levels of IL‑6 and IL‑1β were abnormally increased in patients with liver cancer. It was found that interfering with CXCR3 inhibited cell proliferation and migration, as well as promoted the apoptosis of HBV‑LX‑2 cells. Moreover, interfering with CXCR3 inhibited the expression levels of collagen type I α 1 chain and the proteins in the TLRs/MyD88 pathway. In conclusion, CXCR3 knockdown could inhibit the expression levels of proteins in the TLR4/MyD88 signaling pathway, decrease cell proliferation and migration, and promote cell apoptosis, thus inhibiting the development of liver cirrhosis to liver cancer.
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Affiliation(s)
- Gang Yuan
- Department of Acute Infection, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo, Zhejiang 315010, P.R. China
| | - Bin Chen
- Hepatology Center, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo, Zhejiang 315010, P.R. China
| | - Yina Meng
- Institute of Hepatology, Ningbo University School of Medicine, Ningbo, Zhejiang 315211, P.R. China
| | - Jialin Lu
- Institute of Hepatology, Ningbo University School of Medicine, Ningbo, Zhejiang 315211, P.R. China
| | - Xiaojun Shi
- Department of Hepato-Oncology, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo, Zhejiang 315010, P.R. China
| | - Airong Hu
- Institute of Hepatology, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo, Zhejiang 315010, P.R. China
| | - Yaoren Hu
- Institute of Hepatology, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo, Zhejiang 315010, P.R. China
| | - Donghui Wang
- Department of Acute Infection, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo, Zhejiang 315010, P.R. China
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7
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Campos-Valdez M, Monroy-Ramírez HC, Armendáriz-Borunda J, Sánchez-Orozco LV. Molecular Mechanisms during Hepatitis B Infection and the Effects of the Virus Variability. Viruses 2021; 13:v13061167. [PMID: 34207116 PMCID: PMC8235420 DOI: 10.3390/v13061167] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2021] [Revised: 06/10/2021] [Accepted: 06/11/2021] [Indexed: 12/16/2022] Open
Abstract
The immunopathogenesis and molecular mechanisms involved during a hepatitis B virus (HBV) infection have made the approaches for research complex, especially concerning the patients’ responses in the course of the early acute stage. The study of molecular bases involved in the viral clearance or persistence of the infection is complicated due to the difficulty to detect patients at the most adequate points of the disease, especially in the time lapse between the onset of the infection and the viral emergence. Despite this, there is valuable data obtained from animal and in vitro models, which have helped to clarify some aspects of the early immune response against HBV infection. The diversity of the HBV (genotypes and variants) has been proven to be associated not only with the development and outcome of the disease but also with the response to treatments. That is why factors involved in the virus evolution need to be considered while studying hepatitis B infection. This review brings together some of the published data to try to explain the immunological and molecular mechanisms involved in the different stages of the infection, clinical outcomes, viral persistence, and the impact of the variants of HBV in these processes.
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Affiliation(s)
- Marina Campos-Valdez
- Centro Universitario de Ciencias de la Salud, Departamento de Biología Molecular y Genómica, Instituto de Biología Molecular en Medicina, Universidad de Guadalajara, Guadalajara 44340, Jalisco, México; (M.C.-V.); (H.C.M.-R.); (J.A.-B.)
| | - Hugo C. Monroy-Ramírez
- Centro Universitario de Ciencias de la Salud, Departamento de Biología Molecular y Genómica, Instituto de Biología Molecular en Medicina, Universidad de Guadalajara, Guadalajara 44340, Jalisco, México; (M.C.-V.); (H.C.M.-R.); (J.A.-B.)
| | - Juan Armendáriz-Borunda
- Centro Universitario de Ciencias de la Salud, Departamento de Biología Molecular y Genómica, Instituto de Biología Molecular en Medicina, Universidad de Guadalajara, Guadalajara 44340, Jalisco, México; (M.C.-V.); (H.C.M.-R.); (J.A.-B.)
- Escuela de Medicina y Ciencias de la Salud, Tecnológico de Monterrey, Campus Guadalajara, Zapopan 45201, Jalisco, México
| | - Laura V. Sánchez-Orozco
- Centro Universitario de Ciencias de la Salud, Departamento de Biología Molecular y Genómica, Instituto de Biología Molecular en Medicina, Universidad de Guadalajara, Guadalajara 44340, Jalisco, México; (M.C.-V.); (H.C.M.-R.); (J.A.-B.)
- Correspondence: ; Tel.: +52-33-3954-5677
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8
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Immunopathology of Chronic Hepatitis B Infection: Role of Innate and Adaptive Immune Response in Disease Progression. Int J Mol Sci 2021; 22:ijms22115497. [PMID: 34071064 PMCID: PMC8197097 DOI: 10.3390/ijms22115497] [Citation(s) in RCA: 55] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 05/20/2021] [Accepted: 05/21/2021] [Indexed: 02/07/2023] Open
Abstract
More than 250 million people are living with chronic hepatitis B despite the availability of highly effective vaccines and oral antivirals. Although innate and adaptive immune cells play crucial roles in controlling hepatitis B virus (HBV) infection, they are also accountable for inflammation and subsequently cause liver pathologies. During the initial phase of HBV infection, innate immunity is triggered leading to antiviral cytokines production, followed by activation and intrahepatic recruitment of the adaptive immune system resulting in successful virus elimination. In chronic HBV infection, significant alterations in both innate and adaptive immunity including expansion of regulatory cells, overexpression of co-inhibitory receptors, presence of abundant inflammatory mediators, and modifications in immune cell derived exosome release and function occurs, which overpower antiviral response leading to persistent viral infection and subsequent immune pathologies associated with disease progression towards fibrosis, cirrhosis, and hepatocellular carcinoma. In this review, we discuss the current knowledge of innate and adaptive immune cells transformations that are associated with immunopathogenesis and disease outcome in CHB patients.
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Goh ZY, Ren EC, Ko HL. Intracellular interferon signalling pathways as potential regulators of covalently closed circular DNA in the treatment of chronic hepatitis B. World J Gastroenterol 2021; 27:1369-1391. [PMID: 33911462 PMCID: PMC8047536 DOI: 10.3748/wjg.v27.i14.1369] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 02/23/2021] [Accepted: 03/17/2021] [Indexed: 02/06/2023] Open
Abstract
Infection with the hepatitis B virus (HBV) is still a major global health threat as 250 million people worldwide continue to be chronically infected with the virus. While patients may be treated with nucleoside/nucleotide analogues, this only suppresses HBV titre to sub-detection levels without eliminating the persistent HBV covalently closed circular DNA (cccDNA) genome. As a result, HBV infection cannot be cured, and the virus reactivates when conditions are favorable. Interferons (IFNs) are cytokines known to induce powerful antiviral mechanisms that clear viruses from infected cells. They have been shown to induce cccDNA clearance, but their use in the treatment of HBV infection is limited as HBV-targeting immune cells are exhausted and HBV has evolved multiple mechanisms to evade and suppress IFN signalling. Thus, to fully utilize IFN-mediated intracellular mechanisms to effectively eliminate HBV, instead of direct IFN administration, novel strategies to sustain IFN-mediated anti-cccDNA and antiviral mechanisms need to be developed. This review will consolidate what is known about how IFNs act to achieve its intracellular antiviral effects and highlight the critical interferon-stimulated gene targets and effector mechanisms with potent anti-cccDNA functions. These include cccDNA degradation by APOBECs and cccDNA silencing and transcription repression by epigenetic modifications. In addition, the mechanisms that HBV employs to disrupt IFN signalling will be discussed. Drugs that have been developed or are in the pipeline for components of the IFN signalling pathway and HBV targets that detract IFN signalling mechanisms will also be identified and discussed for utility in the treatment of HBV infections. Together, these will provide useful insights into design strategies that specifically target cccDNA for the eradication of HBV.
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Affiliation(s)
- Zhi Yi Goh
- Singapore Immunology Network, Agency for Science, Technology and Research, Singapore 138648, Singapore
- Integrative Sciences and Engineering Programme, NUS Graduate School, National University of Singapore, Singapore 119077, Singapore
| | - Ee Chee Ren
- Singapore Immunology Network, Agency for Science, Technology and Research, Singapore 138648, Singapore
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119260, Singapore
| | - Hui Ling Ko
- Singapore Immunology Network, Agency for Science, Technology and Research, Singapore 138648, Singapore
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Liver metastasis restrains immunotherapy efficacy via macrophage-mediated T cell elimination. Nat Med 2021; 27:152-164. [PMID: 33398162 PMCID: PMC8095049 DOI: 10.1038/s41591-020-1131-x] [Citation(s) in RCA: 486] [Impact Index Per Article: 162.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Accepted: 10/13/2020] [Indexed: 02/08/2023]
Abstract
Metastasis is the primary cause of cancer mortality, and cancer frequently metastasizes to the liver. It is not clear whether liver immune tolerance mechanisms contribute to cancer outcomes. We report that liver metastases diminish immunotherapy efficacy systemically in patients and preclinical models. Patients with liver metastases derive limited benefit from immunotherapy independent of other established biomarkers of response. In multiple mouse models, we show that liver metastases siphon activated CD8+ T cells from systemic circulation. Within the liver, activated antigen-specific Fas+CD8+ T cells undergo apoptosis following their interaction with FasL+CD11b+F4/80+ monocyte-derived macrophages. Consequently, liver metastases create a systemic immune desert in preclinical models. Similarly, patients with liver metastases have reduced peripheral T cell numbers and diminished tumoral T cell diversity and function. In preclinical models, liver-directed radiotherapy eliminates immunosuppressive hepatic macrophages, increases hepatic T cell survival and reduces hepatic siphoning of T cells. Thus, liver metastases co-opt host peripheral tolerance mechanisms to cause acquired immunotherapy resistance through CD8+ T cell deletion, and the combination of liver-directed radiotherapy and immunotherapy could promote systemic antitumor immunity.
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11
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Virological and immunological predictors of long term outcomes of peginterferon alfa-2a therapy for HBeAg-negative chronic hepatitis B. J Formos Med Assoc 2020; 120:1676-1685. [PMID: 33339708 DOI: 10.1016/j.jfma.2020.12.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 11/04/2020] [Accepted: 12/01/2020] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND/PURPOSE Predictors of long-term outcomes of peginterferon (PegIFN) therapy for patients with chronic hepatitis B (CHB) remain to be explored. This study aimed to evaluate the predictive value of virological and immunological biomarkers and outcomes of PegIFN for CHB. METHODS 57 HBeAg-negative CHB patients receiving 48 weeks of PegIFN therapy were prospectively followed for a median period of 5.3 years after the end of treatment (EOT). Serum CXCL9 and IP-10 levels were measured. Flow cytometry analysis for T cell subsets was performed in 23 patients. Factors associated with long-term outcomes were analyzed. RESULTS The cumulative incidences of virological relapse, clinical relapse and HBsAg loss at year 7 were 18.1%, 0%, 31.6%, respectively, in patients with sustained off-treatment virological response (SVR), and 100%, 67.4%, 6.7%, respectively, in patients without SVR. By multivariate analysis, baseline CXCL9 > 80 pg/mL (hazard ratio (HR) = 0.418, p = 0.018) and on-treatment HBsAg declines were associated with a lower risk of virological relapse. Non-SVR was the only predictor of clinical relapse. CXCL9 >200 pg/mL (HR = 8.154, p = 0.038) and HBsAg <750 IU/mL (HR = 10.507, p = 0.036) were baseline predictors of HBsAg loss, while HBsAg decline >1 log at EOT (HR = 23.296, p = 0.005) was the on-treatment predictor of HBsAg loss. In subgroup patients with available PBMC, populations of T cell subsets correlated with virological and clinical relapses in univariate analysis. CONCLUSION Baseline serum CXCL9 and HBsAg levels could predict HBsAg loss after PegIFN therapy for HBeAg-negative CHB. Combining virological and immunological biomarkers could predict long-term outcomes of PegIFN therapy for HBeAg-negative CHB.
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He Y, Hwang S, Ahmed YA, Feng D, Li N, Ribeiro M, Lafdil F, Kisseleva T, Szabo G, Gao B. Immunopathobiology and therapeutic targets related to cytokines in liver diseases. Cell Mol Immunol 2020; 18:18-37. [PMID: 33203939 DOI: 10.1038/s41423-020-00580-w] [Citation(s) in RCA: 58] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Accepted: 10/15/2020] [Indexed: 02/07/2023] Open
Abstract
Chronic liver injury with any etiology can progress to fibrosis and the end-stage diseases cirrhosis and hepatocellular carcinoma. The progression of liver disease is controlled by a variety of factors, including liver injury, inflammatory cells, inflammatory mediators, cytokines, and the gut microbiome. In the current review, we discuss recent data on a large number of cytokines that play important roles in regulating liver injury, inflammation, fibrosis, and regeneration, with a focus on interferons and T helper (Th) 1, Th2, Th9, Th17, interleukin (IL)-1 family, IL-6 family, and IL-20 family cytokines. Hepatocytes can also produce certain cytokines (such as IL-7, IL-11, and IL-33), and the functions of these cytokines in the liver are briefly summarized. Several cytokines have great therapeutic potential, and some are currently being tested as therapeutic targets in clinical trials for the treatment of liver diseases, which are also described.
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Affiliation(s)
- Yong He
- Laboratory of Liver Diseases, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Seonghwan Hwang
- Laboratory of Liver Diseases, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Yeni Ait Ahmed
- Laboratory of Liver Diseases, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD, 20892, USA.,Université Paris-Est, UMR-S955, UPEC, F-94000, Créteil, France
| | - Dechun Feng
- Laboratory of Liver Diseases, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Na Li
- Department of Medicine and Department of Surgery, School of Medicine, University of California, San Diego, CA, 92093, USA
| | - Marcelle Ribeiro
- Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA
| | - Fouad Lafdil
- Université Paris-Est, UMR-S955, UPEC, F-94000, Créteil, France.,INSERM, U955, F-94000, Créteil, France.,Institut Universitaire de France (IUF), Paris, F-75231, Cedex 05, France
| | - Tatiana Kisseleva
- Department of Medicine and Department of Surgery, School of Medicine, University of California, San Diego, CA, 92093, USA
| | - Gyongyi Szabo
- Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA
| | - Bin Gao
- Laboratory of Liver Diseases, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD, 20892, USA.
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13
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Li L, Zeng Z. Live Imaging of Innate and Adaptive Immune Responses in the Liver. Front Immunol 2020; 11:564768. [PMID: 33042143 PMCID: PMC7527534 DOI: 10.3389/fimmu.2020.564768] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 08/13/2020] [Indexed: 12/21/2022] Open
Abstract
Immune response in the liver is determined by the spatial organization and cellular dynamics of hepatic immune cells. The liver vasculature accommodates abundant tissue-resident innate immune cells, such as Kupffer cells, natural killer cells, and natural killer T cells, to ensure efficient intravascular immunosurveillance. The fenestrated sinusoids also allow direct contact between circulating T cells and non-canonical antigen-presenting cells, such as hepatocytes, to instruct adaptive immune responses. Distinct cellular behaviors are exploited by liver immune cells to exert proper functions. Intravital imaging enables real-time visualization of individual immune cell in living animals, representing a powerful tool in dissecting the spatiotemporal features of intrahepatic immune cells during steady state and liver diseases. This review summarizes current advances in liver immunology prompted by in vivo imaging, with a particular focus on liver-resident innate immune cells and hepatic T cells.
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Affiliation(s)
- Lu Li
- 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
| | - Zhutian Zeng
- 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
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14
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Liu L, Hou J, Xu Y, Qin L, Liu W, Zhang H, Li Y, Chen M, Deng M, Zhao B, Hu J, Zheng H, Li C, Meng S. PD-L1 upregulation by IFN-α/γ-mediated Stat1 suppresses anti-HBV T cell response. PLoS One 2020; 15:e0228302. [PMID: 32628668 PMCID: PMC7337294 DOI: 10.1371/journal.pone.0228302] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Accepted: 06/08/2020] [Indexed: 12/17/2022] Open
Abstract
Programmed death ligand 1 (PD-L1) has been recently shown to be a major obstacle to antiviral immunity by binding to its receptor programmed death 1 (PD-1) on specific IFN-γ producing T cells in chronic hepatitis B. Currently, IFN-α is widely used to treat hepatitis B virus (HBV) infection, but its antiviral effect vary greatly and the mechanism is not totally clear. We found that IFN-α/γ induced a marked increase of PD-L1 expression in hepatocytes. Signal and activators of transcription (Stat1) was then identified as a major transcription factor involved in IFN-α/γ-mediated PD-L1 elevation both in vitro and in mice. Blockage of the PD-L1/PD-1 interaction by a specific mAb greatly enhanced HBV-specific T cell activity by the gp96 adjuvanted therapeutic vaccine, and promoted HBV clearance in HBV transgenic mice. Our results demonstrate the IFN-α/γ-Stat1-PD-L1 axis plays an important role in mediating T cell hyporesponsiveness and inactivating liver-infiltrating T cells in the hepatic microenvironment. These data raise further potential interest in enhancing the anti-HBV efficacy of IFN-α and therapeutic vaccines.
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Affiliation(s)
- LanLan Liu
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Center for Biosafety Mega-Science, Chinese Academy of Sciences (CAS), Institute of Microbiology, Beijing, China
- Institutes of Physical Science and Information Technology, Anhui University, Hefei, China
| | - Junwei Hou
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Center for Biosafety Mega-Science, Chinese Academy of Sciences (CAS), Institute of Microbiology, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Yuxiu Xu
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Center for Biosafety Mega-Science, Chinese Academy of Sciences (CAS), Institute of Microbiology, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Lijuan Qin
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Center for Biosafety Mega-Science, Chinese Academy of Sciences (CAS), Institute of Microbiology, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Weiwei Liu
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Center for Biosafety Mega-Science, Chinese Academy of Sciences (CAS), Institute of Microbiology, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Han Zhang
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Center for Biosafety Mega-Science, Chinese Academy of Sciences (CAS), Institute of Microbiology, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Yang Li
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Center for Biosafety Mega-Science, Chinese Academy of Sciences (CAS), Institute of Microbiology, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Mi Chen
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Center for Biosafety Mega-Science, Chinese Academy of Sciences (CAS), Institute of Microbiology, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Mengmeng Deng
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Center for Biosafety Mega-Science, Chinese Academy of Sciences (CAS), Institute of Microbiology, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Bao Zhao
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Center for Biosafety Mega-Science, Chinese Academy of Sciences (CAS), Institute of Microbiology, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Jun Hu
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Center for Biosafety Mega-Science, Chinese Academy of Sciences (CAS), Institute of Microbiology, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Huaguo Zheng
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Center for Biosafety Mega-Science, Chinese Academy of Sciences (CAS), Institute of Microbiology, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Changfei Li
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Center for Biosafety Mega-Science, Chinese Academy of Sciences (CAS), Institute of Microbiology, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
- * E-mail: (SM); (CL)
| | - Songdong Meng
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Center for Biosafety Mega-Science, Chinese Academy of Sciences (CAS), Institute of Microbiology, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
- * E-mail: (SM); (CL)
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15
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Haque M, Lei F, Xiong X, Ren Y, Kumar A, Das JK, Ren X, Fang D, de Figueiredo P, Yang JM, Song J. Stem Cell-Derived Viral Antigen-Specific T Cells Suppress HBV Replication through Production of IFN-γ and TNF-⍺. iScience 2020; 23:101333. [PMID: 32679546 PMCID: PMC7364173 DOI: 10.1016/j.isci.2020.101333] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 05/13/2020] [Accepted: 06/29/2020] [Indexed: 02/07/2023] Open
Abstract
The viral antigen (Ag)-specific CD8+ cytotoxic T lymphocytes (CTLs) derived from pluripotent stem cells (PSCs), i.e., PSC-CTLs, have the ability to suppress hepatitis B virus (HBV) infection. After adoptive transfer, PSC-CTLs can infiltrate into the liver to suppress HBV replication. Nevertheless, the mechanisms by which the viral Ag-specific PSC-CTLs provoke the antiviral response remain to be fully elucidated. In this study, we generated the functional HBV surface Ag-specific CTLs from the induced PSC (iPSCs), i.e., iPSC-CTLs, and investigated the underlying mechanisms of the CTL-mediated antiviral replication in a murine model. We show that adoptive transfer of HBV surface Ag-specific iPSC-CTLs greatly suppressed HBV replication and prevented HBV surface Ag expression. We further demonstrate that the adoptive transfer significantly increased T cell accumulation and production of antiviral cytokines. These results indicate that stem cell-derived viral Ag-specific CTLs can robustly accumulate in the liver and suppress HBV replication through producing antiviral cytokines.
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Affiliation(s)
- Mohammad Haque
- Department of Microbial Pathogenesis and Immunology, Texas A&M University Health Science Center, MREB II, Room 3344, 8447 Riverside Pkwy, Bryan, TX 77807, USA
| | - Fengyang Lei
- Department of Ophthalmology, Harvard Medical School, Boston, MA 02215, USA
| | - Xiaofang Xiong
- Department of Microbial Pathogenesis and Immunology, Texas A&M University Health Science Center, MREB II, Room 3344, 8447 Riverside Pkwy, Bryan, TX 77807, USA
| | - Yijie Ren
- Department of Microbial Pathogenesis and Immunology, Texas A&M University Health Science Center, MREB II, Room 3344, 8447 Riverside Pkwy, Bryan, TX 77807, USA
| | - Anil Kumar
- Department of Microbial Pathogenesis and Immunology, Texas A&M University Health Science Center, MREB II, Room 3344, 8447 Riverside Pkwy, Bryan, TX 77807, USA
| | - Jugal Kishore Das
- Department of Microbial Pathogenesis and Immunology, Texas A&M University Health Science Center, MREB II, Room 3344, 8447 Riverside Pkwy, Bryan, TX 77807, USA
| | - Xingcong Ren
- Department of Toxicology and Cancer Biology, University of Kentucky College of Medicine, Lexington, KY 40536, USA
| | - Deyu Fang
- Department of Pathology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Paul de Figueiredo
- Department of Microbial Pathogenesis and Immunology, Texas A&M University Health Science Center, MREB II, Room 3344, 8447 Riverside Pkwy, Bryan, TX 77807, USA
| | - Jin-Ming Yang
- Department of Toxicology and Cancer Biology, University of Kentucky College of Medicine, Lexington, KY 40536, USA
| | - Jianxun Song
- Department of Microbial Pathogenesis and Immunology, Texas A&M University Health Science Center, MREB II, Room 3344, 8447 Riverside Pkwy, Bryan, TX 77807, USA.
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16
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Immunopathogenesis of HBV Infection. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1179:71-107. [DOI: 10.1007/978-981-13-9151-4_4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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17
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Abstract
The liver is an immunologically tolerant organ that is uniquely equipped to limit hypersensitivity to food-derived antigens and bacterial products through the portal vein and can feasibly accept liver allografts. The adaptive immune response is a major branch of the immune system that induces organ/tissue-localized and systematic responses against pathogens and tumors while promoting self-tolerance. Persistent infection of the liver with a virus or other pathogen typically results in tolerance, which is a key feature of the liver. The liver's immunosuppressive microenvironment means that hepatic adaptive immune cells become readily tolerogenic, promoting the death of effector cells and the “education” of regulatory cells. The above mechanisms may result in the clonal deletion, exhaustion, or inhibition of peripheral T cells, which are key players in the adaptive immune response. These tolerance mechanisms are believed to be responsible for almost all liver diseases. However, optimal protective adaptive immune responses may be achieved through checkpoint immunotherapy and the modulation of hepatic innate immune cells in the host. In this review, we focus on the mechanisms involved in hepatic adaptive immune tolerance, the liver diseases caused thereby, and the therapeutic strategies needed to overcome this tolerance.
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Affiliation(s)
- Meijuan Zheng
- Department of Clinical Laboratory, First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Zhigang Tian
- Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Innate Immunity and Chronic Disease, Division of Molecular Medicine, School of Life Sciences, University of Science and Technology of China, Hefei, China.,Institute of Immunology, University of Science and Technology of China, Hefei, China
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18
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Chen Y, Hao X, Sun R, Wei H, Tian Z. Natural Killer Cell-Derived Interferon-Gamma Promotes Hepatocellular Carcinoma Through the Epithelial Cell Adhesion Molecule-Epithelial-to-Mesenchymal Transition Axis in Hepatitis B Virus Transgenic Mice. Hepatology 2019; 69:1735-1750. [PMID: 30329167 DOI: 10.1002/hep.30317] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Accepted: 10/09/2018] [Indexed: 12/13/2022]
Abstract
Hepatitis B virus (HBV) is a major risk factor for development of hepatocellular carcinoma (HCC), at least partially due to dysfunctional anti-HBV adaptive immunity; however, the role of innate immune response to HBV in this process is not well understood. In this study, low-dose polyinosinic:polycytidylic acid (poly [I:C]), a natural killer (NK) cell activator (3 μg/g body weight, twice/week for 8 weeks), induced HCC in HBV transgenic (HBs-Tg) mice, with an incidence of 100% after 6 months, while HBs-Tg mice without treatment only had HCC with an incidence of 16.7%. In HBs-Tg mice, poly (I:C) induced liver inflammation with markedly increased infiltrating lymphocytes, along with the concurrently increased apoptosis and proliferation of hepatocytes, leading to the accelerated epithelial-to-mesenchymal transition (EMT) of hepatocytes shown by increased expression of the typical transcriptional factors (Slug, Twist, and mothers against decapentaplegic-interacting protein 1) and phenotypic proteins (vimentin and chemokine [C-X-C motif] receptor 4). The EMT and tumorigenesis in this model depended on the presence of NK cells because depletion of these cells significantly reduced the HCC rate to 28.6%. Further, intrahepatic NK cells highly expressed interferon-gamma (IFN-γ), anti-IFN-γ neutralizing monoclonal antibody might obviously alleviate the hepatitis, and hepatocyte-specific IFN-γ overexpression promoted HCC. Moreover, IFN-γ deficiency in HBs-Tg mice prevented HCC occurring, though hepatic NK cells existed and could be activated, suggesting the critical role of IFN-γ in NK cell-mediated tumorigenesis. In an in vitro experiment, IFN-γ up-regulated epithelial cell adhesion molecule (EpCAM) expression through phosphorylated signal transducer and activator of transcription (p-STAT1) pathway, which was followed by EMT, and p-STAT1 inhibitor might absolutely abolish the expression of EpCAM and EMT in HBV surface antigen-positive hepatocytes. Conclusion: This work demonstrates that NK cell-derived IFN-γ promotes HCC through the EpCAM-EMT axis in HBs-Tg mice, revealing the importance of innate immunity in pathogenesis of HBV-associated HCC.
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Affiliation(s)
- Yongyan Chen
- Division of Molecular Medicine, Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Life Sciences, and Institute of Immunology, University of Science and Technology of China, Hefei, China
| | - Xiaolei Hao
- Division of Molecular Medicine, Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Life Sciences, and Institute of Immunology, University of Science and Technology of China, Hefei, China
| | - Rui Sun
- Division of Molecular Medicine, Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Life Sciences, and Institute of Immunology, University of Science and Technology of China, Hefei, China
| | - Haiming Wei
- Division of Molecular Medicine, Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Life Sciences, and Institute of Immunology, University of Science and Technology of China, Hefei, China
| | - Zhigang Tian
- Division of Molecular Medicine, Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Life Sciences, and Institute of Immunology, University of Science and Technology of China, Hefei, China
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19
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Ma H, Xu M, Song Y, Zhang T, Yin H, Yin S. Interferon-γ facilitated adjuvant-induced arthritis at early stage. Scand J Immunol 2019; 89:e12757. [PMID: 30739356 DOI: 10.1111/sji.12757] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 01/30/2019] [Accepted: 02/04/2019] [Indexed: 12/12/2022]
Abstract
BACKGROUND AND AIM Interferon-γ (IFN-γ) is a versatile cytokine which broadly involves in the inflammatory diseases, mediating both immune activation and tolerance. Here, we aimed to investigate the role of IFN-γ in the initiation of adjuvant-induced arthritis (AIA). METHODS AND RESULTS In an AIA mice model, increasing IFN-γ mRNA was observed at day 3 and peaked on day 7. At day 3, the majority of IFN-γ-producing cells were located around vessels observed by immunofluorescent staining. Recombinant IFN-γ or anti-IFN-γ antibody was injected into the AIA paw on day 2 to study the outcome of AIA. The recipients of IFN-γ showed increased synovial inflammation, whereas anti-IFN-γ antibody injection repressed the expansion of inflammatory cells. As the percentages of blood monocytes were approximately equivalent, we hypothesized that IFN-γ might impact the access of innate leucocytes from blood to expand local inflammation at this stage. Analysis of tissue CD31 and vascular cell adhesion molecule-1 (VCAM-1) expressions suggested a positive effect of these factors in the development of inflammation, and IFN-γ affected the VCAM-1 expression. To further verify this idea, mice regionally injected with IFN-γ were systematically administrated with anti-VCAM-1 antibody during AIA induction. The IFN-γ expression was inhibited, and the development of AIA was partly abolished in these mice regardless of regional IFN-γ injection. CONCLUSION These data suggested that IFN-γ might be critical for the expansion of AIA at early stage through helping inflammatory cell access.
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Affiliation(s)
- Hua Ma
- Department of Rheumatology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu, China
| | - Minwen Xu
- Department of Rheumatology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu, China
| | - Yuanyuan Song
- Department of Rheumatology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu, China
| | - Ting Zhang
- Department of Rheumatology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu, China
| | - Hanqiu Yin
- Department of Rheumatology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu, China
| | - Songlou Yin
- Department of Rheumatology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu, China
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20
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An Assessment of Upper Limits of Normal for ALT and the Impact on Evaluating Natural Course of Chronic Hepatitis B Virus Infection in Chinese Children. Am J Gastroenterol 2018; 113:1660-1668. [PMID: 30353056 DOI: 10.1038/s41395-018-0248-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2018] [Accepted: 07/23/2018] [Indexed: 12/11/2022]
Abstract
BACKGROUND The current upper limits of normal (ULN) for serum alanine aminotransferase (ALT) are increasingly challenged. We aimed to re-evaluate the ULN for ALT and assess the potential impact on the classification of natural course of chronic hepatitis B virus (HBV) infection in children. METHODS Laboratory data obtained from three hospitals in China were retrospectively analysed. In total, 2054 children with chronic HBV infection and 8149 healthy children at age ≤18 years were included in the study. RESULTS Age-specific and gender-specific ULNs for ALT, at averages of 30 U/L for boys and 24 U/L for girls, were calculated from the data of healthy children. Using the revised ULNs vs. the current ULNs (40-50 U/L), 31-60% vs. 9-17% of the 2054 HBV-infected children had an abnormal result as seen in their ALT baseline analysis, and the highest abnormality rate was seen in the infants. Data of 516 HBV-infected children were applied for the classification of clinical phase, 28.8% vs. 19.8% of the children were classified into the phases of hepatitis B e antigen (HBeAg-)positive/negative hepatitis. During a median follow-up of 62 months, 39 of 153 children underwent HBeAg seroconversion, whereas 3 of them had persistently "normal" ALT, according to the current ULN. CONCLUSIONS The revision of ULN for ALT in children substantially impacts the classification of the natural course of chronic HBV infection. Mild ALT fluctuation is common during the stage childhood, suggesting a need to rethink the current conceptions of immune tolerance and natural course of chronic HBV infection in the children.
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21
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Liu QZ, Ma WT, Yang JB, Zhao ZB, Yan K, Yao Y, Li L, Miao Q, Gershwin ME, Lian ZX. The CXC Chemokine Receptor 3 Inhibits Autoimmune Cholangitis via CD8 + T Cells but Promotes Colitis via CD4 + T Cells. Front Immunol 2018; 9:1090. [PMID: 29868034 PMCID: PMC5966573 DOI: 10.3389/fimmu.2018.01090] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Accepted: 05/01/2018] [Indexed: 11/13/2022] Open
Abstract
CXC chemokine receptor 3 (CXCR3), a receptor for the C-X-C motif chemokines (CXCL) CXCL9, CXCL10, and CXCL11, which not only plays a role in chemotaxis but also regulates differentiation and development of memory and effector T cell populations. Herein, we explored the function of CXCR3 in the modulation of different organ-specific autoimmune diseases in interleukin (IL)-2 receptor deficiency (CD25-/-) mice, a murine model for both cholangitis and colitis. We observed higher levels of CXCL9 and CXCL10 in the liver and colon and higher expression of CXCR3 on T cells of the CD25-/- mice compared with control animals. Deletion of CXCR3 resulted in enhanced liver inflammation but alleviated colitis. These changes in liver and colon pathology after CXCR3 deletion were associated with increased numbers of hepatic CD4+ and CD8+ T cells, in particular effector memory CD8+ T cells, as well as decreased T cells in mesenteric lymph nodes and colon lamina propria. In addition, increased interferon-γ response and decreased IL-17A response was observed in both liver and colon after CXCR3 deletion. CXCR3 modulated the functions of T cells involved in different autoimmune diseases, whereas the consequence of such modulation was organ-specific regarding to their effects on disease severity. Our findings emphasize the importance of extra caution in immunotherapy for organ-specific autoimmune diseases, as therapeutic interventions aiming at a target such as CXCR3 for certain disease could result in adverse effects in an unrelated organ.
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Affiliation(s)
- Qing-Zhi Liu
- Liver Immunology Laboratory, School of Life Sciences, University of Science and Technology of China, Hefei, China.,Chronic Disease Laboratory, School of Medicine, Institutes for Life Sciences, South China University of Technology, Guangzhou, China
| | - Wen-Tao Ma
- Liver Immunology Laboratory, School of Life Sciences, University of Science and Technology of China, Hefei, China.,College of Veterinary Medicine, Northwest Agriculture and Forestry University, Yangling, China
| | - Jing-Bo Yang
- Liver Immunology Laboratory, School of Life Sciences, University of Science and Technology of China, Hefei, China
| | - Zhi-Bin Zhao
- Liver Immunology Laboratory, School of Life Sciences, University of Science and Technology of China, Hefei, China.,Chronic Disease Laboratory, School of Medicine, Institutes for Life Sciences, South China University of Technology, Guangzhou, China
| | - Kai Yan
- Liver Immunology Laboratory, School of Life Sciences, University of Science and Technology of China, Hefei, China.,Chronic Disease Laboratory, School of Medicine, Institutes for Life Sciences, South China University of Technology, Guangzhou, China
| | - Yuan Yao
- Liver Immunology Laboratory, School of Life Sciences, University of Science and Technology of China, Hefei, China.,Chronic Disease Laboratory, School of Medicine, Institutes for Life Sciences, South China University of Technology, Guangzhou, China
| | - Liang Li
- Liver Immunology Laboratory, School of Life Sciences, University of Science and Technology of China, Hefei, China.,Chronic Disease Laboratory, School of Medicine, Institutes for Life Sciences, South China University of Technology, Guangzhou, China
| | - Qi Miao
- Department of Gastroenterology and Hepatology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - M Eric Gershwin
- Division of Rheumatology, Allergy and Clinical Immunology, School of Medicine, University of California, Davis, Davis, CA, United States
| | - Zhe-Xiong Lian
- Liver Immunology Laboratory, School of Life Sciences, University of Science and Technology of China, Hefei, China.,Chronic Disease Laboratory, School of Medicine, Institutes for Life Sciences, South China University of Technology, Guangzhou, China
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22
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Yi X, Yuan Y, Li N, Yi L, Wang C, Qi Y, Gong L, Liu G, Kong X. A mouse model with age-dependent immune response and immune-tolerance for HBV infection. Vaccine 2018; 36:794-801. [PMID: 29306503 DOI: 10.1016/j.vaccine.2017.12.071] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Revised: 12/10/2017] [Accepted: 12/27/2017] [Indexed: 01/04/2023]
Abstract
BACKGROUND Viral clearance of human HBV infection largely depends on the age of exposure. Thus, a mouse model with age-dependent immune response and immune-tolerance for HBV infection was established. METHODS HBVRag1 mice were generated by crossing Rag1-/- mice with HBV-Tg mice. Following adoptive transfer of splenocytes adult (8-9 weeks old) and young (3 weeks old) HBVRag1 mice were named as HBVRag-ReA and HBVRag-ReY mice respectively. The biochemical parameters that were associated with viral load and immune function, as well as the histological evaluation of the liver tissues between the two mouse models were detected. The immune tolerance of HBVRag-ReY mice that were reconstituted at the early stages of life was evaluated by quantitative hepatitis B core antibody assay, adoptive transfer, and modulation of gut microbiota with the addition of antibiotics. RESULTS HBVRag-ReA mice indicated apparent hepatocytes damage, clearance of HBsAg and production of HBsAb and HBcAb. HBVRag-ReY mice did not develop ALT elevation, and produced HBcAb and HBsAg. A higher number of hepatic CD8+ T and B cells promoted clearance of HBsAg in HBVRag-ReA mice following 30 days of lymphocyte transfer. In contrast to HBVRag-ReA mice, HBVRag-ReY mice exhibited higher levels of Th1/Th2 cytokines. HBVRag-ReY mice exhibited significantly higher (P < .01, approximately 10-fold) serum quantitative anti-HBc levels than HBV-Tg mice, which might be similar to the phase of immune clearance and immune tolerance in human HBV infection. Furthermore, the age-related tolerance in HBVRag-ReY mice that were sensitive to antibiotic treatment was different from that noted in HBV-Tg mice. GS-9620 could inhibit the production of HBsAg, whereas HBV vaccination could induce sustained seroconversion in HBVRag-ReY mice with low levels of HBsAg. CONCLUSIONS The present study described a mouse model with age-dependent immunity and immune-tolerance for HBV infection in vivo, which may mimic chronic HBV infection in humans.
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Affiliation(s)
- Xuerui Yi
- Liver Diseases Research Center, The 458th Hospital of Guangzhou, Guangzhou 510600, China.
| | - Youcheng Yuan
- Liver Diseases Research Center, The 458th Hospital of Guangzhou, Guangzhou 510600, China
| | - Na Li
- Liver Diseases Research Center, The 458th Hospital of Guangzhou, Guangzhou 510600, China
| | - Lu Yi
- Liver Diseases Research Center, The 458th Hospital of Guangzhou, Guangzhou 510600, China
| | - Cuiling Wang
- Liver Diseases Research Center, The 458th Hospital of Guangzhou, Guangzhou 510600, China
| | - Ying Qi
- Liver Diseases Research Center, The 458th Hospital of Guangzhou, Guangzhou 510600, China
| | - Liang Gong
- Liver Diseases Research Center, The 458th Hospital of Guangzhou, Guangzhou 510600, China
| | - Guangze Liu
- Liver Diseases Research Center, The 458th Hospital of Guangzhou, Guangzhou 510600, China
| | - Xiangping Kong
- Liver Diseases Research Center, The 458th Hospital of Guangzhou, Guangzhou 510600, China
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23
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Abstract
Chronic hepatitis B virus (HBV) infection is a global public health issue. There are >250 million people chronically infected with HBV, and these chronic carriers are at high risk of developing end-stage liver diseases and hepatocellular carcinoma. Patients with chronic hepatitis B (CHB) usually acquire the virus perinatally, while most patients infected during adulthood develop acute hepatitis B (AHB), which usually results in viral clearance. HBV infection is noncytopathic, and liver injury is mostly contributed by host immune responses. The virus is stealthy, since the infection rarely induces type I interferon response in the early phase. In AHB, viral infection is detected and restrained by the innate immune response, which is followed by a strong and robust adaptive immune response and accompanied by viral clearance. In patients with CHB, both innate and adaptive immune responses are weak and thus rarely lead to viral clearance. Interferon α and nucleos(t)ide analogues are 2 classes of approved antiviral therapies. The former treatment activates nature killer (NK) cells and NK T cells, which partially enhances the innate immune response, while the later treatment suppresses viral replication by inhibiting reverse transcriptase, which may restore the HBV-specific adaptive immune response. However, single or combined treatment are still far from achieving seroclearance of HBV surface antigen. Although the treatment response is unsatisfactory in current clinical trials using several immunomodulators for boosting antiviral immunity, immunotherapy that is able to induce immune surveillance is still the most promising modality for HBV cure in the future.
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Affiliation(s)
- Tai-Chung Tseng
- Department of Internal Medicine, National Taiwan University Hospital-Jinshan Branch, New Taipei City.,Hepatitis Research Center, National Taiwan University Hospital
| | - Li-Rung Huang
- Graduate Institute of Clinical Medicine, National Taiwan University, Taipei.,Institute of Molecular and Genomic Medicine, National Health Research Institutes, Miaoli, Taiwan
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Cui K, Yan G, Zheng X, Bai L, Wei H, Sun R, Tian Z. Suppression of Natural Killer Cell Activity by Regulatory NKT10 Cells Aggravates Alcoholic Hepatosteatosis. Front Immunol 2017; 8:1414. [PMID: 29163491 PMCID: PMC5670109 DOI: 10.3389/fimmu.2017.01414] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Accepted: 10/12/2017] [Indexed: 12/28/2022] Open
Abstract
We and others have found that the functions of hepatic natural killer (NK) cells are inhibited but invariant NKT (iNKT) cells become activated after alcohol drinking, leaving a possibility that there exists interplay between NK cells and iNKT cells during alcoholic liver disease. Here, in a chronic plus single-binge ethanol consumption mouse model, we observed that NK cells and interferon-γ (IFN-γ) protected against ethanol-induced liver steatosis, as both wild-type (WT) mice treated with anti-asialo GM1 antibody and IFN-γ-deficient GKO mice developed more severe alcoholic fatty livers. As expected, IFN-γ could directly downregulate lipogenesis in primary hepatocytes in vitro. On the contrary, iNKT cell-deficient Jα18-/- or interleukin-10 (IL-10)-/- mice showed fewer alcoholic steatosis, along with the recovered number and IFN-γ release of hepatic NK cells, and exogenous IL-10 injection was sufficient to compensate for iNKT cell deficiency. Furthermore, NK cell depletion in Jα18-/- or IL-10-/- mice caused more severe hepatosteatosis, implying NK cells are the direct effector cells to inhibit liver steatosis. Importantly, adoptive transfer of iNKT cells purified from normal but not IL-10-/- mice resulted in suppression of the number and functions of NK cells and aggravated alcoholic liver injury in Jα18-/- mice, indicating that IL-10-producing iNKT (NKT10) cells are the regulators on NK cells. Conclusion: Ethanol exposure-triggered NKT10 cells antagonize the protective roles of NK cells in alcoholic hepatosteatosis.
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Affiliation(s)
- Kele Cui
- The CAS Key Laboratory of Innate Immunity and Chronic Disease and Institute of Immunology, School of Life Sciences and Medical Center, University of Science & Technology of China, Hefei, China.,Anhui Province Hospital Affiliated Anhui Medical University, Hefei, China
| | - Guoxiu Yan
- The CAS Key Laboratory of Innate Immunity and Chronic Disease and Institute of Immunology, School of Life Sciences and Medical Center, University of Science & Technology of China, Hefei, China
| | - Xiaodong Zheng
- The CAS Key Laboratory of Innate Immunity and Chronic Disease and Institute of Immunology, School of Life Sciences and Medical Center, University of Science & Technology of China, Hefei, China
| | - Li Bai
- The CAS Key Laboratory of Innate Immunity and Chronic Disease and Institute of Immunology, School of Life Sciences and Medical Center, University of Science & Technology of China, Hefei, China
| | - Haiming Wei
- The CAS Key Laboratory of Innate Immunity and Chronic Disease and Institute of Immunology, School of Life Sciences and Medical Center, University of Science & Technology of China, Hefei, China.,Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Rui Sun
- The CAS Key Laboratory of Innate Immunity and Chronic Disease and Institute of Immunology, School of Life Sciences and Medical Center, University of Science & Technology of China, Hefei, China.,Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
| | - Zhigang Tian
- The CAS Key Laboratory of Innate Immunity and Chronic Disease and Institute of Immunology, School of Life Sciences and Medical Center, University of Science & Technology of China, Hefei, China.,Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
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Yu J, Chen Y, Wu Y, Ye L, Lian Z, Wei H, Sun R, Tian Z. The differential organogenesis and functionality of two liver-draining lymph nodes in mice. J Autoimmun 2017; 84:109-121. [PMID: 28886898 DOI: 10.1016/j.jaut.2017.08.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Revised: 08/17/2017] [Accepted: 08/17/2017] [Indexed: 12/13/2022]
Abstract
The liver is an immunological organ. However, fundamental knowledge concerning liver-draining lymph nodes (LNs), which have been newly identified in mice as the portal and celiac LNs, is still lacking. Here, we revealed that the portal LN and celiac LN drain liver lymph through different lymphatic vessels. Although both the portal LN and celiac LN possess typical structures, they have different cell compositions. Interestingly, these two LNs form at different times during fetal development. Moreover, the organogenesis of the celiac LN, but not the portal LN, is controlled by the transcription factor NFIL3. Furthermore, the portal LN and celiac LN also perform different functions. The celiac LN is the predominant site of liver antiviral immune responses, whereas the portal LN functions in the in situ induction of dietary antigen-specific regulatory T cells. In conclusion, the portal LN and celiac LN are two independent liver-draining LNs with different organogenesis histories and separate functions in maintaining immune homeostasis in the liver.
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Affiliation(s)
- Jiali Yu
- Hefei National Laboratory for Physical Sciences at Microscale, The Key Laboratory of Innate Immunity and Chronic Disease (Chinese Academy of Science), Institute of Immunology, School of Life Sciences and Medical Center, University of Science and Technology of China, Hefei, Anhui 230027, China
| | - Yongyan Chen
- Hefei National Laboratory for Physical Sciences at Microscale, The Key Laboratory of Innate Immunity and Chronic Disease (Chinese Academy of Science), Institute of Immunology, School of Life Sciences and Medical Center, University of Science and Technology of China, Hefei, Anhui 230027, China; Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, 310003, China
| | - Yuzhang Wu
- Institute of Immunology, Third Military Medical University, Chongqing, 400038, China.
| | - Lilin Ye
- Institute of Immunology, Third Military Medical University, Chongqing, 400038, China
| | - Zhexiong Lian
- Hefei National Laboratory for Physical Sciences at Microscale, The Key Laboratory of Innate Immunity and Chronic Disease (Chinese Academy of Science), Institute of Immunology, School of Life Sciences and Medical Center, University of Science and Technology of China, Hefei, Anhui 230027, China
| | - Haiming Wei
- Hefei National Laboratory for Physical Sciences at Microscale, The Key Laboratory of Innate Immunity and Chronic Disease (Chinese Academy of Science), Institute of Immunology, School of Life Sciences and Medical Center, University of Science and Technology of China, Hefei, Anhui 230027, China; Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, 310003, China
| | - Rui Sun
- Hefei National Laboratory for Physical Sciences at Microscale, The Key Laboratory of Innate Immunity and Chronic Disease (Chinese Academy of Science), Institute of Immunology, School of Life Sciences and Medical Center, University of Science and Technology of China, Hefei, Anhui 230027, China; Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, 310003, China
| | - Zhigang Tian
- Hefei National Laboratory for Physical Sciences at Microscale, The Key Laboratory of Innate Immunity and Chronic Disease (Chinese Academy of Science), Institute of Immunology, School of Life Sciences and Medical Center, University of Science and Technology of China, Hefei, Anhui 230027, China; Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, 310003, China.
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Tsai KN, Kuo CF, Ou JHJ. Mechanisms of Hepatitis B Virus Persistence. Trends Microbiol 2017; 26:33-42. [PMID: 28823759 PMCID: PMC5741523 DOI: 10.1016/j.tim.2017.07.006] [Citation(s) in RCA: 128] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Revised: 07/07/2017] [Accepted: 07/21/2017] [Indexed: 12/15/2022]
Abstract
Hepatitis B virus (HBV) chronically infects 250 million people worldwide, resulting in nearly one million deaths annually. Studies in recent years have significantly improved our knowledge on the mechanisms of HBV persistence. HBV uses multiple pathways to harness host innate immunity to enhance its replication. It can also take advantage of the developing immune system and the not-yet-stabilized gut microbiota of young children to facilitate its persistence, and use maternal viral e antigen to educate immunity of the offspring to support its persistence after vertical transmission. The knowledge gained from these recent studies paves the way for the development of new therapies for the treatment of chronic HBV infection, which has so far been very challenging.
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Affiliation(s)
- Kuen-Nan Tsai
- Department of Molecular Microbiology and Immunology, University of Southern California Keck School of Medicine, Los Angeles, CA 90033, USA
| | - Cheng-Fu Kuo
- Department of Molecular Microbiology and Immunology, University of Southern California Keck School of Medicine, Los Angeles, CA 90033, USA
| | - Jing-Hsiung James Ou
- Department of Molecular Microbiology and Immunology, University of Southern California Keck School of Medicine, Los Angeles, CA 90033, USA.
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