1
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Yu JH, Choi MG, Lee NY, Kwon A, Lee E, Koo JH. Hepatocyte GPCR signaling regulates IRF3 to control hepatic stellate cell transdifferentiation. Cell Commun Signal 2024; 22:48. [PMID: 38233853 PMCID: PMC10795343 DOI: 10.1186/s12964-023-01416-6] [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: 08/02/2023] [Accepted: 12/02/2023] [Indexed: 01/19/2024] Open
Abstract
BACKGROUND Interferon Regulatory Factor 3 (IRF3) is a transcription factor that plays a crucial role in the innate immune response by recognizing and responding to foreign antigens. Recently, its roles in sterile conditions are being studied, as in metabolic and fibrotic diseases. However, the search on the upstream regulator for efficient pharmacological targeting is yet to be fully explored. Here, we show that G protein-coupled receptors (GPCRs) can regulate IRF3 phosphorylation through of GPCR-Gα protein interaction. RESULTS IRF3 and target genes were strongly associated with fibrosis markers in liver fibrosis patients and models. Conditioned media from MIHA hepatocytes overexpressing IRF3 induced fibrogenic activation of LX-2 hepatic stellate cells (HSCs). In an overexpression library screening using active mutant Gα subunits and Phos-tag immunoblotting, Gαs was found out to strongly phosphorylate IRF3. Stimulation of Gαs by glucagon or epinephrine or by Gαs-specific designed GPCR phosphorylated IRF3. Protein kinase A (PKA) signaling was primarily responsible for IRF3 phosphorylation and Interleukin 33 (IL-33) expression downstream of Gαs. PKA phosphorylated IRF3 on a previously unrecognized residue and did not require reported upstream kinases such as TANK-binding kinase 1 (TBK1). Activation of Gαs signaling by glucagon induced IL-33 production in hepatocytes. Conditioned media from the hepatocytes activated HSCs, as indicated by α-SMA and COL1A1 expression, and this was reversed by pre-treatment of the media with IL-33 neutralizing antibody. CONCLUSIONS Gαs-coupled GPCR signaling increases IRF3 phosphorylation through cAMP-mediated activation of PKA. This leads to an increase of IL-33 expression, which further contributes to HSC activation. Our findings that hepatocyte GPCR signaling regulates IRF3 to control hepatic stellate cell transdifferentiation provides an insight for understanding the complex intercellular communication during liver fibrosis progression and suggests therapeutic opportunities for the disease. Video Abstract.
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Affiliation(s)
- Jae-Hyun Yu
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, 08826, Republic of Korea
| | - Myeung Gi Choi
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, 08826, Republic of Korea
| | - Na Young Lee
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, 08826, Republic of Korea
| | - Ari Kwon
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, 08826, Republic of Korea
| | - Euijin Lee
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, 08826, Republic of Korea
| | - Ja Hyun Koo
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, 08826, Republic of Korea.
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2
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Blake ME, Kleinpeter AB, Jureka AS, Petit CM. Structural Investigations of Interactions between the Influenza a Virus NS1 and Host Cellular Proteins. Viruses 2023; 15:2063. [PMID: 37896840 PMCID: PMC10612106 DOI: 10.3390/v15102063] [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: 08/22/2023] [Revised: 09/26/2023] [Accepted: 09/28/2023] [Indexed: 10/29/2023] Open
Abstract
The Influenza A virus is a continuous threat to public health that causes yearly epidemics with the ever-present threat of the virus becoming the next pandemic. Due to increasing levels of resistance, several of our previously used antivirals have been rendered useless. There is a strong need for new antivirals that are less likely to be susceptible to mutations. One strategy to achieve this goal is structure-based drug development. By understanding the minute details of protein structure, we can develop antivirals that target the most conserved, crucial regions to yield the highest chances of long-lasting success. One promising IAV target is the virulence protein non-structural protein 1 (NS1). NS1 contributes to pathogenicity through interactions with numerous host proteins, and many of the resulting complexes have been shown to be crucial for virulence. In this review, we cover the NS1-host protein complexes that have been structurally characterized to date. By bringing these structures together in one place, we aim to highlight the strength of this field for drug discovery along with the gaps that remain to be filled.
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Affiliation(s)
| | | | | | - Chad M. Petit
- Department of Biochemistry and Molecular Genetics, University of Alabama at Birmingham, Birmingham, AL 35294, USA; (M.E.B.)
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3
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Xu C, Chen J, Chen X. Host Innate Immunity Against Hepatitis Viruses and Viral Immune Evasion. Front Microbiol 2021; 12:740464. [PMID: 34803956 PMCID: PMC8598044 DOI: 10.3389/fmicb.2021.740464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 09/29/2021] [Indexed: 11/13/2022] Open
Abstract
Hepatitis viruses are primary causative agents of hepatitis and represent a major source of public health problems in the world. The host innate immune system forms the first line of defense against hepatitis viruses. Hepatitis viruses are sensed by specific pathogen recognition receptors (PRRs) that subsequently trigger the innate immune response and interferon (IFN) production. However, hepatitis viruses evade host immune surveillance via multiple strategies, which help compromise the innate immune response and create a favorable environment for viral replication. Therefore, this article reviews published findings regarding host innate immune sensing and response against hepatitis viruses. Furthermore, we also focus on how hepatitis viruses abrogate the antiviral effects of the host innate immune system.
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Affiliation(s)
- Chonghui Xu
- State Key Laboratory of Virology, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Jizheng Chen
- State Key Laboratory of Virology, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, China.,Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China
| | - Xinwen Chen
- State Key Laboratory of Virology, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, China.,Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China
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4
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Ishizaka A, Koga M, Mizutani T, Lim LA, Adachi E, Ikeuchi K, Ueda R, Aoyagi H, Tanaka S, Kiyono H, Matano T, Aizaki H, Yoshio S, Mita E, Muramatsu M, Kanto T, Tsutsumi T, Yotsuyanagi H. Prolonged Gut Dysbiosis and Fecal Excretion of Hepatitis A Virus in Patients Infected with Human Immunodeficiency Virus. Viruses 2021; 13:v13102101. [PMID: 34696531 PMCID: PMC8539651 DOI: 10.3390/v13102101] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 10/13/2021] [Accepted: 10/14/2021] [Indexed: 12/24/2022] Open
Abstract
Hepatitis A virus (HAV) causes transient acute infection, and little is known of viral shedding via the duodenum and into the intestinal environment, including the gut microbiome, from the period of infection until after the recovery of symptoms. Therefore, in this study, we aimed to comprehensively observe the amount of virus excreted into the intestinal tract, the changes in the intestinal microbiome, and the level of inflammation during the healing process. We used blood and stool specimens from patients with human immunodeficiency virus who were infected with HAV during the HAV outbreak in Japan in 2018. Moreover, we observed changes in fecal HAV RNA and quantified the plasma cytokine level and gut microbiome by 16S rRNA analysis from clinical onset to at least 6 months after healing. HAV was detected from clinical onset up to a period of more than 150 days. Immediately after infection, many pro-inflammatory cytokines were elicited, and some cytokines showed different behaviors. The intestinal microbiome changed significantly after infection (dysbiosis), and the dysbiosis continued for a long time after healing. These observations suggest that the immunocompromised state is associated with prolonged viral shedding into the intestinal tract and delayed recovery of the intestinal environment.
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Affiliation(s)
- Aya Ishizaka
- Division of Infectious Diseases, Advanced Clinical Research Center, The Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan; (A.I.); (M.K.); (T.T.)
- International Research and Development Center for Mucosal Vaccines, The Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan;
- Japan Foundation for AIDS Prevention, Tokyo 101-0064, Japan
| | - Michiko Koga
- Division of Infectious Diseases, Advanced Clinical Research Center, The Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan; (A.I.); (M.K.); (T.T.)
| | - Taketoshi Mizutani
- Division of Infectious Diseases, Advanced Clinical Research Center, The Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan; (A.I.); (M.K.); (T.T.)
- International Research and Development Center for Mucosal Vaccines, The Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan;
- Correspondence: (T.M.); (H.Y.)
| | - Lay Ahyoung Lim
- Department of Infectious Diseases and Applied Immunology, IMSUT Hospital of Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan; (L.A.L.); (E.A.); (K.I.)
| | - Eisuke Adachi
- Department of Infectious Diseases and Applied Immunology, IMSUT Hospital of Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan; (L.A.L.); (E.A.); (K.I.)
| | - Kazuhiko Ikeuchi
- Department of Infectious Diseases and Applied Immunology, IMSUT Hospital of Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan; (L.A.L.); (E.A.); (K.I.)
| | - Ryuta Ueda
- Department of Virology II, National Institute of Infectious Diseases, Tokyo 162-8640, Japan; (R.U.); (H.A.); (H.A.); (M.M.)
| | - Haruyo Aoyagi
- Department of Virology II, National Institute of Infectious Diseases, Tokyo 162-8640, Japan; (R.U.); (H.A.); (H.A.); (M.M.)
| | - Satoshi Tanaka
- Department of Gastroenterology and Hepatology, National Hospital Organization Osaka National Hospital, Osaka 540-0006, Japan; (S.T.); (E.M.)
| | - Hiroshi Kiyono
- International Research and Development Center for Mucosal Vaccines, The Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan;
- CU-UCSD Center for Mucosal Immunology, Allergy and Vaccines (cMAV), Department of Medicine, University of California San Diego, San Diego, CA 92093, USA
| | - Tetsuro Matano
- AIDS Research Center, National Institute of Infectious Diseases, Tokyo 162-8640, Japan;
- Department of AIDS Vaccine Development, IMSUT Hospital, The Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan
| | - Hideki Aizaki
- Department of Virology II, National Institute of Infectious Diseases, Tokyo 162-8640, Japan; (R.U.); (H.A.); (H.A.); (M.M.)
| | - Sachiyo Yoshio
- The Research Center for Hepatitis and Immunology, National Center for Global Health and Medicine, Chiba 272-8516, Japan; (S.Y.); (T.K.)
| | - Eiji Mita
- Department of Gastroenterology and Hepatology, National Hospital Organization Osaka National Hospital, Osaka 540-0006, Japan; (S.T.); (E.M.)
| | - Masamichi Muramatsu
- Department of Virology II, National Institute of Infectious Diseases, Tokyo 162-8640, Japan; (R.U.); (H.A.); (H.A.); (M.M.)
| | - Tatsuya Kanto
- The Research Center for Hepatitis and Immunology, National Center for Global Health and Medicine, Chiba 272-8516, Japan; (S.Y.); (T.K.)
| | - Takeya Tsutsumi
- Division of Infectious Diseases, Advanced Clinical Research Center, The Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan; (A.I.); (M.K.); (T.T.)
| | - Hiroshi Yotsuyanagi
- Division of Infectious Diseases, Advanced Clinical Research Center, The Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan; (A.I.); (M.K.); (T.T.)
- Department of Infectious Diseases and Applied Immunology, IMSUT Hospital of Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan; (L.A.L.); (E.A.); (K.I.)
- Correspondence: (T.M.); (H.Y.)
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5
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Zheng Z, Li Y, Zhang M, Liu Y, Fu M, Gong S, Hu Q. Human Norovirus NTPase Antagonizes Interferon-β Production by Interacting With IkB Kinase ε. Front Microbiol 2021; 12:687933. [PMID: 34335514 PMCID: PMC8319745 DOI: 10.3389/fmicb.2021.687933] [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: 03/30/2021] [Accepted: 06/17/2021] [Indexed: 12/29/2022] Open
Abstract
Human norovirus (HuNoV) is the leading cause of epidemic acute gastroenteritis worldwide. Type I interferons (IFN)-α/β are highly potent cytokines that are initially identified for their essential roles in antiviral defense. It was reported that HuNoV infection did not induce IFN-β expression but was controlled in the presence of IFN-β in human intestinal enteroids and a gnotobiotic pig model, suggesting that HuNoV has likely developed evasion countermeasures. In this study, we found that a cDNA clone of GII.4 HuNoV, the predominantly circulating genotype worldwide, inhibits the production of IFN-β and identified the viral NTPase as a key component responsible for such inhibition. HuNoV NTPase not only inhibits the activity of IFN-β promoter but also the mRNA and protein production of IFN-β. Additional studies indicate that NTPase inhibits the phosphorylation and nuclear translocation of interferon-regulatory factor-3 (IRF-3), leading to the suppression of IFN-β promoter activation. Mechanistically, NTPase interacts with IkB kinase ε (IKKε), an important factor for IRF-3 phosphorylation, and such interaction blocks the association of IKKε with unanchored K48-linked polyubiquitin chains, resulting in the inhibition of IKKε phosphorylation. Further studies demonstrated that the 1-179 aa domain of NTPase which interacts with IKKε is critical for the suppression of IFN-β production. Our findings highlight the role of HuNoV NTPase in the inhibition of IFN-β production, providing insights into a novel mechanism underlying how HuNoV evades the host innate immunity.
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Affiliation(s)
- Zifeng Zheng
- The Joint Laboratory of Translational Precision Medicine, Guangzhou Women and Children's Medical Center, Guangzhou, China.,The Joint Laboratory of Translational Precision Medicine, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, China
| | - Yuncheng Li
- State Key Laboratory of Virology, Center for Biosafety Mega-Science, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, China.,Savaid Medical School, University of Chinese Academy of Sciences, Beijing, China
| | - Mudan Zhang
- Department of Gastroenterology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, China
| | - Yalan Liu
- State Key Laboratory of Virology, Center for Biosafety Mega-Science, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, China
| | - Ming Fu
- The Joint Laboratory of Translational Precision Medicine, Guangzhou Women and Children's Medical Center, Guangzhou, China.,The Joint Laboratory of Translational Precision Medicine, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, China
| | - Sitang Gong
- Department of Gastroenterology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, China
| | - Qinxue Hu
- State Key Laboratory of Virology, Center for Biosafety Mega-Science, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, China.,Institute for Infection and Immunity, St George's, University of London, London, United Kingdom
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6
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Hepatitis A virus-induced hsa-miR-146a-5p attenuates IFN-β signaling by targeting adaptor protein TRAF6. Arch Virol 2021; 166:789-799. [PMID: 33459883 DOI: 10.1007/s00705-021-04952-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Accepted: 11/26/2020] [Indexed: 12/21/2022]
Abstract
Hepatitis A virus (HAV), a unique hepatotropic human picornavirus, is the causative agent of acute hepatitis A in humans. Some studies have shown that HAV antagonizes the innate immune response by disrupting interferon-beta (IFN-β) signaling by viral proteins. However, whether microRNAs (miRNAs), a class of non-coding RNAs, are involved in the antagonism of IFN-β induction upon HAV infection is still unclear. In this study, we investigated the effects and mechanisms by which HAV-induced miRNAs antagonize IFN-β signaling. A variety of analytical methods, including miRNA microarray, RT-qPCR, dual-luciferase reporter assay, and Western blotting, were performed using HAV-infected cells. The results indicated that HAV infection upregulates the expression of hsa-miR-146a-5p, which in turn partially suppresses the induction of IFN-β synthesis, thereby promoting viral replication. Mechanistically, TRAF6 (TNF receptor-associated factor 6), a key adaptor protein in the RIG-I/MDA5-mediated IFN-I signaling pathway, is targeted and degraded by hsa-miR-146a-5p. As TRAF6 is necessary for IFN-β induction, inhibition of this protein attenuates IFN-β signaling. Taken together, the results from this study indicated that HAV disrupts RIG-I/MDA5-mediated IFN-I signaling partially through the cleavage of the essential adaptor molecule TRAF6 via hsa-miR-146a-5p.
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7
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Li Z, Yang Y, Lu H, Zhang J, Xu R, Shi J, Lan Y, Guan J, Zhao K, He H, Gao F, He W. Porcine haemagglutinating encephalomyelitis virus deactivates transcription factor IRF3 and limits type I interferon production. Vet Microbiol 2020; 252:108918. [PMID: 33191000 DOI: 10.1016/j.vetmic.2020.108918] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Accepted: 11/01/2020] [Indexed: 12/24/2022]
Abstract
Porcine haemagglutinating encephalomyelitis virus (PHEV) is a member of coronavirus that causes acute infectious disease and high mortality in piglets. The transcription factor IRF3 is a central regulator of type I interferon (IFN) innate immune signalling. Here, we report that PHEV infection of RAW264.7 cells results in strong suppression of IFN-β production in the early stage. A comparative analysis of the upstream effector of IFN-β transcription demonstrated that deactivation of IRF3, but not p65 or ATF-2 proteins, is uniquely attributed to failure of early IFN-β induction. Moreover, the RIG-I/MDA5/MAVS/TBK1-dependent protective response that regulates the IRF3 pathway is not disrupted by PHEV and works well underlying the deactivated IRF3-mediated IFN-β inhibition. After challenge with poly(I:C), a synthetic analogue of dsRNA used to stimulate IFN-β secretion in the TLR-controlled pathway, we show that PHEV and poly(I:C) regulate IFN-β-induction via two different pathways. Collectively, our findings reveal that deactivation of IRF3 is a specific mechanism that contributes to termination of type I IFN signalling during early infection with PHEV independent of the conserved RIG-I/MAVS/MDA5/TBK1-mediated innate immune response.
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Affiliation(s)
- Zi Li
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Yawen Yang
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Huijun Lu
- Key Laboratory of Zoonosis Research, Ministry of Education, Institute of Zoonosis, Jilin University, Changchun, China
| | - Jing Zhang
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Rongyi Xu
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Junchao Shi
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Yungang Lan
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Jiyu Guan
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Kui Zhao
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Hongbin He
- Key Laboratory of Animal Resistant Biology of Shandong, Ruminant Disease Research Center, College of Life Sciences, Shandong Normal University, Jinan, China
| | - Feng Gao
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China.
| | - Wenqi He
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China.
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8
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Qu C, Zhang S, Li Y, Wang Y, Peppelenbosch MP, Pan Q. Mitochondria in the biology, pathogenesis, and treatment of hepatitis virus infections. Rev Med Virol 2019; 29:e2075. [PMID: 31322806 PMCID: PMC6771966 DOI: 10.1002/rmv.2075] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 06/18/2019] [Accepted: 06/19/2019] [Indexed: 12/19/2022]
Abstract
Hepatitis virus infections affect a large proportion of the global population. The host responds rapidly to viral infection by orchestrating a variety of cellular machineries, in particular, the mitochondrial compartment. Mitochondria actively regulate viral infections through modulation of the cellular innate immunity and reprogramming of metabolism. In turn, hepatitis viruses are able to modulate the morphodynamics and functions of mitochondria, but the mode of actions are distinct with respect to different types of hepatitis viruses. The resulting mutual interactions between viruses and mitochondria partially explain the clinical presentation of viral hepatitis, influence the response to antiviral treatment, and offer rational avenues for novel therapy. In this review, we aim to consider in depth the multifaceted interactions of mitochondria with hepatitis virus infections and emphasize the implications for understanding pathogenesis and advancing therapeutic development.
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Affiliation(s)
- Changbo Qu
- TEDA Institute of Biological Sciences and Biotechnology, Nankai University, Tianjin, China.,The Key Laboratory of Molecular Microbiology and Technology, Ministry of Education, Tianjin, China.,Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, The Netherlands
| | - Shaoshi Zhang
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, The Netherlands
| | - Yang Li
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, The Netherlands
| | - Yijin Wang
- Department of Pathology and Hepatology, Beijing 302 Hospital, Beijing, China
| | - Maikel P Peppelenbosch
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, The Netherlands
| | - Qiuwei Pan
- Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, The Netherlands
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9
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Feng Z, Lemon SM. Innate Immunity to Enteric Hepatitis Viruses. Cold Spring Harb Perspect Med 2019; 9:cshperspect.a033464. [PMID: 29686040 DOI: 10.1101/cshperspect.a033464] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Although hepatitis A virus (HAV) and hepatitis E virus (HEV) are both positive-strand RNA viruses that replicate in the cytoplasm of hepatocytes, there are important differences in the ways they induce and counteract host innate immune responses. HAV is remarkably stealthy because of its ability to evade and disrupt innate signaling pathways that lead to interferon production. In contrast, HEV does not block interferon production. Instead, it persists in the presence of an interferon response. These differences may provide insight into HEV persistence in immunocompromised patients, an emerging health problem in developed countries.
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Affiliation(s)
- Zongdi Feng
- Center for Vaccines and Immunity, The Research Institute at Nationwide Children's Hospital, The Ohio State University College of Medicine, Columbus, Ohio 43205
| | - Stanley M Lemon
- Departments of Medicine and Microbiology & Immunology, Lineberger Comprehensive Cancer Center, The University of North Carolina, Chapel Hill, North Carolina 27599
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10
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Rodríguez-Carrio J, López P, Alperi-López M, Caminal-Montero L, Ballina-García FJ, Suárez A. IRF4 and IRGs Delineate Clinically Relevant Gene Expression Signatures in Systemic Lupus Erythematosus and Rheumatoid Arthritis. Front Immunol 2019; 9:3085. [PMID: 30666255 PMCID: PMC6330328 DOI: 10.3389/fimmu.2018.03085] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Accepted: 12/13/2018] [Indexed: 12/26/2022] Open
Abstract
Introduction: Overactivation of the type I interferon (IFN) signature has been observed in several systemic autoimmune conditions, such as Systemic Lupus Erythematosus (SLE) or Rheumatoid Arthritis (RA). Impaired control of Interferon-Responding Genes (IRGs) expression by their regulatory mechanisms, including Interferon Regulatory Factors (IRFs), may underlie these findings and it may explain the heterogeneity observed among these conditions. In the present study we aimed to evaluate the associations between IRF4 gene expression and those of IRGs in SLE and RA patients to gain insight about its links with the IFN signature as well as to explore the potential clinical relevance of these associations. Methods: The gene expression of IRF4 and IRGs (IFI44, IFI44L, IFI6, and MX1) in peripheral blood was analyzed in 75 SLE patients, 98 RA patients, and 28 healthy controls. A group of 13 biological-naïve RA patients was prospectively followed upon TNFα-blockade. The associations among IRF4 and IRGs were evaluated by principal component analyses (PCA), correlations and network analyses. Publicly available datasets were used for replication. Results: A broad activation of IRGs was observed in autoimmune patients, although certain heterogeneity can be distinguished, whereas IRF4 was only upregulated in RA. The differential expression of IRF4 in RA was then confirmed in publicly available gene expression datasets. PCA revealed different associations among IRF4 and IRGs in each condition, which was later confirmed by correlation and network analyses. Cluster analysis identified 3 gene expression signatures on the basis of IRF4 and IRGs expression which were differentially used by SLE and RA patients. Cluster III was associated with markers of disease severity in SLE patients. Cluster II, hallmarked by IRF4 upregulation, was linked to clinical stage and mild disease course in RA. TNFα-blockade led to changes in the association between IRF4 and IRGs, whereas increasing IRF4 expression was associated with a good clinical outcome in RA. Conclusions: The differential expression of IRF4 and IRGs observed in SLE and RA can delineate gene expression signatures associated with clinical features and treatment outcomes. These results support a clinically-relevant phenomenon of shaping of the IFN signature by IRF4 in autoimmune patients.
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Affiliation(s)
- Javier Rodríguez-Carrio
- Area of Immunology, Department of Functional Biology, Faculty of Medicine, University of Oviedo, Oviedo, Spain.,Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Oviedo, Spain.,Bone and Mineral Research Unit, REDinREN del ISCIII, Hospital Universitario Central de Asturias, Oviedo, Spain
| | - Patricia López
- Area of Immunology, Department of Functional Biology, Faculty of Medicine, University of Oviedo, Oviedo, Spain.,Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Oviedo, Spain
| | - Mercedes Alperi-López
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Oviedo, Spain.,Department of Rheumatology, Hospital Universitario Central de Asturias, Oviedo, Spain
| | - Luis Caminal-Montero
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Oviedo, Spain.,Department of Internal Medicine, Hospital Universitario Central de Asturias, Oviedo, Spain
| | - Francisco J Ballina-García
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Oviedo, Spain.,Department of Rheumatology, Hospital Universitario Central de Asturias, Oviedo, Spain
| | - Ana Suárez
- Area of Immunology, Department of Functional Biology, Faculty of Medicine, University of Oviedo, Oviedo, Spain.,Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Oviedo, Spain
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11
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Cao X, Xue YJ, Du JL, Xu Q, Yang XC, Zeng Y, Wang BB, Wang HZ, Liu J, Cai KZ, Ma ZR. Induction and Suppression of Innate Antiviral Responses by Hepatitis A Virus. Front Microbiol 2018; 9:1865. [PMID: 30174659 PMCID: PMC6107850 DOI: 10.3389/fmicb.2018.01865] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2018] [Accepted: 07/25/2018] [Indexed: 12/25/2022] Open
Abstract
Hepatitis A virus (HAV) belongs to the family Picornaviridae. It is the pathogen of acute viral hepatitis caused by fecal-oral transmission. RNA viruses are sensed by pathogen-associated pattern recognition receptors (PRRs) such as Toll-like receptor 3 (TLR3), retinoic acid-inducible gene I (RIG-I), and melanoma differentiation-associated gene 5 (MDA5). PRR activation leads to production of type 1 interferon (IFN-α/β), serving as the first line of defense against viruses. However, HAV has developed various strategies to compromise the innate immune system and promote viral propagation within the host cells. The long coevolution of HAV in hosts has prompted the development of effective immune antagonism strategies that actively fight against host antiviral responses. Proteases encoded by HAV can cleave the mitochondrial antiviral signaling protein (MAVS, also known as IPS-1, VISA, or Cardif), TIR domain- containing adaptor inducing IFN-β (TRIF, also known as TICAM-1) and nuclear factor-κB (NF-κB) essential modulator (NEMO), which are key adaptor proteins in RIG-I-like receptor (RLR), TLR3 and NF-κB signaling, respectively. In this mini-review, we summarize all the recent progress on the interaction between HAV and the host, especially focusing on how HAV abrogates the antiviral effects of the innate immune system.
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Affiliation(s)
- Xin Cao
- College of Life Science and Engineering, Northwest Minzu University, Engineering & Technology Research Center for Animal Cell, Lanzhou, China
- Key Laboratory of Bioengineering & Biotechnology of State Ethnic Affairs Commission, Lanzhou, China
- State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Yu-jia Xue
- College of Life Science and Engineering, Northwest Minzu University, Engineering & Technology Research Center for Animal Cell, Lanzhou, China
- Key Laboratory of Bioengineering & Biotechnology of State Ethnic Affairs Commission, Lanzhou, China
| | - Jiang-long Du
- College of Life Science and Engineering, Northwest Minzu University, Engineering & Technology Research Center for Animal Cell, Lanzhou, China
- Key Laboratory of Bioengineering & Biotechnology of State Ethnic Affairs Commission, Lanzhou, China
| | - Qiang Xu
- College of Life Science and Engineering, Northwest Minzu University, Engineering & Technology Research Center for Animal Cell, Lanzhou, China
- Key Laboratory of Bioengineering & Biotechnology of State Ethnic Affairs Commission, Lanzhou, China
| | - Xue-cai Yang
- College of Life Science and Engineering, Northwest Minzu University, Engineering & Technology Research Center for Animal Cell, Lanzhou, China
- Key Laboratory of Bioengineering & Biotechnology of State Ethnic Affairs Commission, Lanzhou, China
| | - Yan Zeng
- State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Bo-bo Wang
- College of Life Science and Engineering, Northwest Minzu University, Engineering & Technology Research Center for Animal Cell, Lanzhou, China
- Key Laboratory of Bioengineering & Biotechnology of State Ethnic Affairs Commission, Lanzhou, China
| | - Hai-zhen Wang
- Hebi Precision Medical Research Institute, People's Hospital of Hebi, Hebi, China
| | - Jing Liu
- Department of Medical OncologyPeople's Hospital of Hebi, Hebi, China
| | - Kui-zheng Cai
- College of Life Science and Engineering, Northwest Minzu University, Engineering & Technology Research Center for Animal Cell, Lanzhou, China
- Key Laboratory of Bioengineering & Biotechnology of State Ethnic Affairs Commission, Lanzhou, China
| | - Zhong-ren Ma
- College of Life Science and Engineering, Northwest Minzu University, Engineering & Technology Research Center for Animal Cell, Lanzhou, China
- Key Laboratory of Bioengineering & Biotechnology of State Ethnic Affairs Commission, Lanzhou, China
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Wang L, Fu X, Zheng Y, Zhou P, Fang B, Huang S, Zhang X, Chen J, Cao Z, Tian J, Li S. The NS1 protein of H5N6 feline influenza virus inhibits feline beta interferon response by preventing NF-κB and IRF3 activation. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2017; 74:60-68. [PMID: 28395999 PMCID: PMC7173090 DOI: 10.1016/j.dci.2017.04.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Revised: 04/06/2017] [Accepted: 04/06/2017] [Indexed: 06/07/2023]
Abstract
Despite the apparent lack of a feline influenza virus lineage, cats are susceptible to infection by influenza A viruses. Here, we characterized in vitro A/feline/Guangdong/1/2015, an H5N6 avian influenza virus recently isolated from cats. A/feline/Guangdong/1/2015 replicated to high titers and caused CPE in feline kidney cells. We determined that infection with A/feline/Guangdong/1/2015 did not activate the IFN-β promoter, but inhibited it by blocking the activation of NF-κB and IRF3. We also determined that the viral NS1 protein mediated the block, and that the dsRNA binding domain of NS1 was essential to perform this function. In contrast to treatment after infection, cells pretreated with IFN-β suppressed viral replication. Our findings provide an example of an H5N6 influenza virus suppressing IFN production, which might be associated with interspecies transmission of avian influenza viruses to cats.
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Affiliation(s)
- Lifang Wang
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, PR China; Key Laboratory of Comprehensive Prevention and Control for Severe Clinical Animal Diseases of Guangdong Province, Guangzhou, PR China; Guangdong Engineering and Technological Research Center on Pet, Guangzhou, PR China
| | - Xinliang Fu
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, PR China; Key Laboratory of Comprehensive Prevention and Control for Severe Clinical Animal Diseases of Guangdong Province, Guangzhou, PR China
| | - Yun Zheng
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, PR China; Key Laboratory of Comprehensive Prevention and Control for Severe Clinical Animal Diseases of Guangdong Province, Guangzhou, PR China; Guangdong Engineering and Technological Research Center on Pet, Guangzhou, PR China
| | - Pei Zhou
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, PR China; Key Laboratory of Comprehensive Prevention and Control for Severe Clinical Animal Diseases of Guangdong Province, Guangzhou, PR China; Guangdong Engineering and Technological Research Center on Pet, Guangzhou, PR China
| | - Bo Fang
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, PR China; Key Laboratory of Comprehensive Prevention and Control for Severe Clinical Animal Diseases of Guangdong Province, Guangzhou, PR China
| | - San Huang
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, PR China; Key Laboratory of Comprehensive Prevention and Control for Severe Clinical Animal Diseases of Guangdong Province, Guangzhou, PR China; Guangdong Engineering and Technological Research Center on Pet, Guangzhou, PR China
| | - Xin Zhang
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, PR China; Key Laboratory of Comprehensive Prevention and Control for Severe Clinical Animal Diseases of Guangdong Province, Guangzhou, PR China; Guangdong Engineering and Technological Research Center on Pet, Guangzhou, PR China
| | - Jidang Chen
- School of Life Science and Engineering, Foshan University, Guangzhou, PR China
| | - Zongxi Cao
- Hainan Academy of Agricultural Science, Hainan, PR China
| | - Jin Tian
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, PR China.
| | - Shoujun Li
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, PR China; Key Laboratory of Comprehensive Prevention and Control for Severe Clinical Animal Diseases of Guangdong Province, Guangzhou, PR China; Guangdong Engineering and Technological Research Center on Pet, Guangzhou, PR China.
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13
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Sung PS, Hong SH, Lee J, Park SH, Yoon SK, Chung WJ, Shin EC. CXCL10 is produced in hepatitis A virus-infected cells in an IRF3-dependent but IFN-independent manner. Sci Rep 2017; 7:6387. [PMID: 28744018 PMCID: PMC5527116 DOI: 10.1038/s41598-017-06784-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Accepted: 06/19/2017] [Indexed: 01/26/2023] Open
Abstract
Acute hepatitis A caused by hepatitis A virus (HAV) infection is accompanied by severe liver injury in adult patients, and the liver injury is associated with the production of chemokines. Herein, we investigated the mechanism of how HAV infection induces the production of CXCR3 and CCR5 chemokines, such as CXCL10, CCL4 and CCL5. The production of CXCL10, CCL4 and CCL5 was markedly increased by HAV (HM-175/18f) infection in the culture of primary human hepatocytes and HepG2 cells. In particular, CXCL10 was produced in HAV-infected cells, not in neighboring uninfected cells. Moreover, these chemokines were significantly increased in the sera of acute hepatitis A patients. The production of IFN-λs was also robustly induced by HAV infection, and the blocking of secreted IFN-λs partially abrogated the production of CCL4 and CCL5 in HAV-infected cells. However, CXCL10 production was not decreased by the blocking of IFN-λs. Instead, CXCL10 production was reduced by silencing the expression of RIG-I-like receptor (RLR) signal molecules, such as mitochondrial antiviral signaling protein and interferon regulatory factor 3, in HAV-infected cells. In conclusion, HAV infection strongly induces the production of helper 1 T cell-associated chemokines, particularly CXCL10 via RLR signaling, even without secreted IFNs.
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Affiliation(s)
- Pil Soo Sung
- Laboratory of Immunology and Infectious Diseases, Graduate School of Medical Science and Engineering, KAIST, Daejeon, Republic of Korea
- Division of Hepatology, Department of Internal Medicine, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul, Republic of Korea
| | - Seon-Hui Hong
- Biomedical Science and Engineering Interdisciplinary Program, KAIST, Daejeon, Republic of Korea
| | - Jeewon Lee
- Biomedical Science and Engineering Interdisciplinary Program, KAIST, Daejeon, Republic of Korea
| | - Su-Hyung Park
- Biomedical Science and Engineering Interdisciplinary Program, KAIST, Daejeon, Republic of Korea
- Laboratory of Translational Immunology and Vaccinology, Graduate School of Medical Science and Engineering, KAIST, Daejeon, Republic of Korea
| | - Seung Kew Yoon
- Division of Hepatology, Department of Internal Medicine, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul, Republic of Korea
| | - Woo Jin Chung
- Department of Internal Medicine, Keimyung University School of Medicine, Daegu, Republic of Korea
| | - Eui-Cheol Shin
- Laboratory of Immunology and Infectious Diseases, Graduate School of Medical Science and Engineering, KAIST, Daejeon, Republic of Korea.
- Biomedical Science and Engineering Interdisciplinary Program, KAIST, Daejeon, Republic of Korea.
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Phosphorylated Codonopsis pilosula polysaccharide could inhibit the virulence of duck hepatitis A virus compared with Codonopsis pilosula polysaccharide. Int J Biol Macromol 2017; 94:28-35. [DOI: 10.1016/j.ijbiomac.2016.10.002] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2016] [Revised: 10/01/2016] [Accepted: 10/02/2016] [Indexed: 12/14/2022]
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Wu H, Liu Y, Zu S, Sun X, Liu C, Liu D, Zhang X, Tian J, Qu L. In vitro antiviral effect of germacrone on feline calicivirus. Arch Virol 2016; 161:1559-67. [PMID: 26997613 PMCID: PMC7087046 DOI: 10.1007/s00705-016-2825-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Accepted: 03/10/2016] [Indexed: 02/02/2023]
Abstract
Feline calicivirus (FCV) often causes respiratory tract and oral disease in cats and is a highly contagious virus. Widespread vaccination does not prevent the spread of FCV. Furthermore, the low fidelity of the RNA-dependent RNA polymerase of FCV leads to the emergence of new variants, some of which show increased virulence. Currently, few effective anti-FCV drugs are available. Here, we found that germacrone, one of the main constituents of volatile oil from rhizoma curcuma, was able to effectively reduce the growth of FCV strain F9 in vitro. This compound exhibited a strong anti-FCV effect mainly in the early phase of the viral life cycle. The antiviral effect depended on the concentration of the drug. In addition, germacrone treatment had a significant inhibitory effect against two other reference strains, 2280 and Bolin, and resulted in a significant reduction in the replication of strains WZ-1 and HRB-SS, which were recently isolated in China. This is the first report of antiviral effects of germacrone against a calicivirus, and extensive in vivo research is needed to evaluate this drug as an antiviral therapeutic agent for FCV.
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Affiliation(s)
- Hongxia Wu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin, 150001 People’s Republic of China
| | - Yongxiang Liu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin, 150001 People’s Republic of China
| | - Shaopo Zu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin, 150001 People’s Republic of China
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, People’s Republic of China
| | - Xue Sun
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin, 150001 People’s Republic of China
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, People’s Republic of China
| | - Chunguo Liu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin, 150001 People’s Republic of China
| | - Dafei Liu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin, 150001 People’s Republic of China
| | - Xiaozhan Zhang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin, 150001 People’s Republic of China
| | - Jin Tian
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin, 150001 People’s Republic of China
| | - Liandong Qu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Nangang District, Harbin, 150001 People’s Republic of China
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16
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Su S, Huang S, Fu C, Wang L, Zheng Y, Zhou P, Li S. Identification of the IFN-β response in H3N2 canine influenza virus infection. J Gen Virol 2016; 97:18-26. [DOI: 10.1099/jgv.0.000322] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Shuo Su
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, PR China
- Key Laboratory of Comprehensive Prevention and Control for Severe Clinical Animal Diseases of Guangdong Province, Guangzhou, PR China
- Guangdong Engineering and Technological Research Center on pet, Guangzhou, PR China
| | - San Huang
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, PR China
- Key Laboratory of Comprehensive Prevention and Control for Severe Clinical Animal Diseases of Guangdong Province, Guangzhou, PR China
- Guangdong Engineering and Technological Research Center on pet, Guangzhou, PR China
| | - Cheng Fu
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, PR China
- Key Laboratory of Comprehensive Prevention and Control for Severe Clinical Animal Diseases of Guangdong Province, Guangzhou, PR China
- Guangdong Engineering and Technological Research Center on pet, Guangzhou, PR China
| | - Lifang Wang
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, PR China
- Key Laboratory of Comprehensive Prevention and Control for Severe Clinical Animal Diseases of Guangdong Province, Guangzhou, PR China
- Guangdong Engineering and Technological Research Center on pet, Guangzhou, PR China
| | - Yun Zheng
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, PR China
- Key Laboratory of Comprehensive Prevention and Control for Severe Clinical Animal Diseases of Guangdong Province, Guangzhou, PR China
- Guangdong Engineering and Technological Research Center on pet, Guangzhou, PR China
| | - Pei Zhou
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, PR China
- Key Laboratory of Comprehensive Prevention and Control for Severe Clinical Animal Diseases of Guangdong Province, Guangzhou, PR China
- Guangdong Engineering and Technological Research Center on pet, Guangzhou, PR China
| | - Shoujun Li
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, PR China
- Key Laboratory of Comprehensive Prevention and Control for Severe Clinical Animal Diseases of Guangdong Province, Guangzhou, PR China
- Guangdong Engineering and Technological Research Center on pet, Guangzhou, PR China
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Kell A, Stoddard M, Li H, Marcotrigiano J, Shaw GM, Gale M. Pathogen-Associated Molecular Pattern Recognition of Hepatitis C Virus Transmitted/Founder Variants by RIG-I Is Dependent on U-Core Length. J Virol 2015; 89:11056-68. [PMID: 26311867 PMCID: PMC4621103 DOI: 10.1128/jvi.01964-15] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Accepted: 08/19/2015] [Indexed: 12/25/2022] Open
Abstract
UNLABELLED Despite the introduction of direct-acting antiviral (DAA) drugs against hepatitis C virus (HCV), infection remains a major public health concern because DAA therapeutics do not prevent reinfection and patients can still progress to chronic liver disease. Chronic HCV infection is supported by a variety of viral immune evasion strategies, but, remarkably, 20% to 30% of acute infections spontaneously clear prior to development of adaptive immune responses, thus implicating innate immunity in resolving acute HCV infection. However, the virus-host interactions regulating acute infection are unknown. Transmission of HCV involves one or a few transmitted/founder (T/F) variants. In infected hepatocytes, the retinoic acid-inducible gene I (RIG-I) protein recognizes 5' triphosphate (5'ppp) of the HCV RNA and a pathogen-associated molecular pattern (PAMP) motif located within the 3' untranslated region consisting of poly-U/UC. PAMP binding activates RIG-I to induce innate immune signaling and type 1 interferon antiviral defenses. HCV poly-U/UC sequences can differ in length and complexity, suggesting that PAMP diversity in T/F genomes could regulate innate immune control of acute HCV infection. Using 14 unique poly-U/UC sequences from HCV T/F genomes recovered from acute-infection patients, we tested whether RIG-I recognition and innate immune activation correlate with PAMP sequence characteristics. We show that T/F variants are recognized by RIG-I in a manner dependent on length of the U-core motif of the poly-U/UC PAMP and are recognized by RIG-I to induce innate immune responses that restrict acute infection. PAMP recognition of T/F HCV variants by RIG-I may therefore impart innate immune signaling and HCV restriction to impact acute-phase-to-chronic-phase transition. IMPORTANCE Recognition of nonself molecular patterns such as those seen with viral nucleic acids is an essential step in triggering the immune response to virus infection. Innate immunity is induced by hepatitis C virus infection through the recognition of viral RNA by the cellular RIG-I protein, where RIG-I recognizes a poly-uridine/cytosine motif in the viral genome. Variation within this motif may provide an immune evasion strategy for transmitted/founder viruses during acute infection. Using 14 unique poly-U/UC sequences from HCV T/F genomes recovered from acutely infected HCV patients, we demonstrate that RIG-I binding and activation of innate immunity depend primarily on the length of the uridine core within this motif. T/F variants found in acute infection contained longer U cores within the motif and could activate RIG-I and induce innate immune signaling sufficient to restrict viral infection. Thus, recognition of T/F variants by RIG-I could significantly impact the transition from acute to chronic infection.
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Affiliation(s)
- Alison Kell
- Center for Innate Immunity and Immune Disease, Department of Immunology, School of Medicine, University of Washington, Seattle, Washington, USA
| | - Mark Stoddard
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Hui Li
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Joe Marcotrigiano
- Center for Advanced Biotechnology and Medicine, Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, New Jersey, USA
| | - George M Shaw
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Michael Gale
- Center for Innate Immunity and Immune Disease, Department of Immunology, School of Medicine, University of Washington, Seattle, Washington, USA
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Tian J, Zhang X, Wu H, Liu C, Li Z, Hu X, Su S, Wang LF, Qu L. Blocking the PI3K/AKT pathway enhances mammalian reovirus replication by repressing IFN-stimulated genes. Front Microbiol 2015; 6:886. [PMID: 26388843 PMCID: PMC4557281 DOI: 10.3389/fmicb.2015.00886] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Accepted: 08/14/2015] [Indexed: 11/25/2022] Open
Abstract
Many host cellular signaling pathways were activated and exploited by virus infection for more efficient replication. The PI3K/Akt pathway has recently attracted considerable interest due to its role in regulating virus replication. This study demonstrated for the first time that the mammalian reovirus strains Masked Palm Civet/China/2004 (MPC/04) and Bat/China/2003 (B/03) can induce transient activation of the PI3K/Akt pathway early in infection in vitro. When UV-treated, both viruses activated PI3K/Akt signaling, indicating that the virus/receptor interaction was sufficient to activate PI3K/Akt. Reovirus virions can use both clathrin- and caveolae-mediated endocytosis, but only chlorpromazine, a specific inhibitor of clathrin-mediated endocytosis, or siRNA targeting clathrin suppressed Akt phosphorylation. We also identified the upstream molecules of the PI3K pathway. Virus infection induced phosphorylation of focal adhesion kinase (FAK) but not Gab1, and blockage of FAK phosphorylation suppressed Akt phosphorylation. Blockage of PI3K/Akt activation increased virus RNA synthesis and viral yield. We also found that reovirus infection activated the IFN-stimulated response element (ISRE) in an interferon-independent manner and up-regulated IFN-stimulated genes (ISGs) via the PI3K/Akt/EMSY pathway. Suppression of PI3K/Akt activation impaired the induction of ISRE and down-regulated the expression of ISGs. Overexpression of ISG15 and Viperin inhibited virus replication, and knockdown of either enhanced virus replication. Collectively, these results demonstrate that PI3K/Akt activated by mammalian reovirus serves as a pathway for sensing and then inhibiting virus replication/infection.
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Affiliation(s)
- Jin Tian
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences , Harbin, China
| | - Xiaozhan Zhang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences , Harbin, China
| | - Hongxia Wu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences , Harbin, China
| | - Chunguo Liu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences , Harbin, China
| | - Zhijie Li
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences , Harbin, China
| | - Xiaoliang Hu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences , Harbin, China
| | - Shuo Su
- College of Veterinary Medicine, South China Agricultural University , Guangzhou, China
| | - Lin-Fa Wang
- Program in Emerging Infectious Diseases, Duke-NUS Graduate Medical School , Singapore, Singapore
| | - Liandong Qu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences , Harbin, China
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Cao L, Ge X, Gao Y, Herrler G, Ren Y, Ren X, Li G. Porcine epidemic diarrhea virus inhibits dsRNA-induced interferon-β production in porcine intestinal epithelial cells by blockade of the RIG-I-mediated pathway. Virol J 2015; 12:127. [PMID: 26283628 PMCID: PMC4539884 DOI: 10.1186/s12985-015-0345-x] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2015] [Accepted: 07/21/2015] [Indexed: 12/17/2022] Open
Abstract
Background The lack of optimal porcine cell lines has severely impeded the study and progress in elucidation of porcine epidemic diarrhea virus (PEDV) pathogenesis. Vero cell, an African green monkey kidney cell line, was often used to isolate and propagate PEDV. Nonetheless, the target cells of PEDV in vivo are intestinal epithelial cells, during infection, intestinal epithelia would be damaged and resulted in digestive disorders. The immune functions of porcine epithelial cells and interactions with other immune cell populations display a number of differences compared to other species. Type I interferon (IFN) plays an important role in antiviral immune response. Limited reports showed that PEDV could inhibit type I interferon production. In this study, porcine small intestinal epithelial cells (IECs), the target cells of PEDV, were used as the infection model in vitro to identify the possible molecular mechanisms of PEDV-inhibition IFN-β production. Results PEDV not only failed to induce IFN-β expression, but also inhibited dsRNA-mediated IFN-β production in IECs. As the key IFN-β transcription factors, we found that dsRNA-induced activation of IFN regulatory factor 3 (IRF-3) was inhibited after PEDV infection, but not nuclear factor-kappaB (NF-κB). To identify the mechanism of PEDV intervention with dsRNA-mediated IFN-β expression more accurately, the role of individual molecules of RIG-I signaling pathway were investigated. In the upstream of IRF-3, TANK-binding kinase 1 (TBK1)-or inhibitor of κB kinase-ε (IKKε)-mediated IFN-β production was not blocked by PEDV, while RIG-I-and its adapter molecule IFN-β promoter stimulator 1 (IPS-1)-mediated IFN-β production were completely inhibited after PEDV infection. Conclusion Taken together, our data demonstrated for the first time that PEDV infection of its target cell line, IECs, inhibited dsRNA-mediated IFN-β production by blocking the activation of IPS-1 in RIG-I-mediated pathway. Our studies offered new visions in understanding of the interaction between PEDV and host innate immune system.
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Affiliation(s)
- Liyan Cao
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Xiangfang District, Harbin, 150030, China.
| | - Xuying Ge
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Xiangfang District, Harbin, 150030, China.
| | - Yu Gao
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Xiangfang District, Harbin, 150030, China.
| | - Georg Herrler
- Institute of Virology University of Veterinary Medicine, BÜnteweg 17, D-30559, Hannover, Germany.
| | - Yudong Ren
- College of Electrical and Information, Northeast Agricultural University, Harbin, 150030, China.
| | - Xiaofeng Ren
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Xiangfang District, Harbin, 150030, China.
| | - Guangxing Li
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Xiangfang District, Harbin, 150030, China.
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Tian J, Zhang X, Wu H, Liu C, Liu J, Hu X, Qu L. Assessment of the IFN-β response to four feline caliciviruses: Infection in CRFK cells. INFECTION GENETICS AND EVOLUTION 2015; 34:352-60. [PMID: 26051884 DOI: 10.1016/j.meegid.2015.06.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Revised: 05/22/2015] [Accepted: 06/01/2015] [Indexed: 11/26/2022]
Abstract
Feline calicivirus (FCV) is a highly contagious pathogen with a widespread distribution. Although the cat genome has been sequenced, little is known about innate immunity in cats, which limits the understanding of FCV pathogenesis. To investigate the IFN-β response during FCV infection in CRFK cells, we first cloned and identified the feline IFN-β promoter sequence and the positive regulatory domain (PRD) motifs, which shared a high similarity with human and porcine IFN-β promoters. Next, we found that infections with FCV strains F9, Bolin and HRB-SS at the 100 or 1000 TCID50 doses could not activate the IFN-β promoter at 12 and 24h post-infection. Only strain 2280 infection at a 1000 TCID50 dose could induce the IFN-β promoter mainly through IRF3 and partially through NF-κB, at 24h post-infection. However, the IFN response occurred much later and was smaller in magnitude compared with that following Sendai virus (SeV) infection. Further, we found that induction of the IFN-β promoter by FCV 2280 infection depended on dsRNA and not on viral proteins. Finally, we examined whether the IFN-β response had an antiviral effect against FCV replication. The over-expression of IFN-β before exposure to the virus reduced viral yields by a range of 2.2-3.2 log10TCID50, but its over-expression at 12h post-infection did not inhibit FCV replication. Our results indicate that some FCV strains cannot induce IFN-β expression in vitro, which may be a potential factor for FCV survival in cats. Whether this is important in evading the host interferon response in vivo must be investigated.
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Affiliation(s)
- Jin Tian
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, PR China
| | - Xiaozhan Zhang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, PR China
| | - Hongxia Wu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, PR China
| | - Chunguo Liu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, PR China
| | - Jiasen Liu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, PR China
| | - Xiaoliang Hu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, PR China
| | - Liandong Qu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, PR China.
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21
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Chang JT, Yang CS, Chen YS, Chen BC, Chiang AJ, Chang YH, Tsai WL, Lin YS, Chao D, Chang TH. Genome and infection characteristics of human parechovirus type 1: the interplay between viral infection and type I interferon antiviral system. PLoS One 2015; 10:e0116158. [PMID: 25646764 PMCID: PMC4380134 DOI: 10.1371/journal.pone.0116158] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Accepted: 12/02/2014] [Indexed: 01/05/2023] Open
Abstract
Human parechoviruses (HPeVs), members of the family
Picornaviridae, are associated with severe human clinical
conditions such as gastrointestinal disease, encephalitis, meningitis,
respiratory disease and neonatal sepsis. A new contemporary strain of HPeV1,
KVP6 (accession no. KC769584), was isolated from a clinical specimen.
Full-genome alignment revealed that HPeV1 KVP6 shares high genome homology with
the German strain of HPeV1, 7555312 (accession no. FM178558) and could be
classified in the clade 1B group. An intertypic recombination was shown within
the P2-P3 genome regions of HPeV1. Cell-type tropism test showed that T84 cells
(colon carcinoma cells), A549 cells (lung carcinoma cells) and DBTRG-5MG cells
(glioblastoma cells) were susceptible to HPeV1 infection, which might be
relevant clinically. A facilitated cytopathic effect and increased viral titers
were reached after serial viral passages in Vero cells, with viral genome
mutation found in later passages. HPeV1 is sensitive to elevated temperature
because 39°C incubation impaired virion production. HPeV1 induced innate
immunity with phosphorylation of interferon (IFN) regulatory transcription
factor 3 and production of type I IFN in A549 but not T84 cells. Furthermore,
type I IFN inhibited HPeV1 production in A549 cells but not T84 cells; T84 cells
may be less responsive to type I IFN stimulation. Moreover, HPeV1-infected cells
showed downregulated type I IFN activation, which indicated a type I IFN evasion
mechanism. The characterization of the complete genome and infection features of
HPeV1 provide comprehensive information about this newly isolated HPeV1 for
further diagnosis, prevention or treatment strategies.
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Affiliation(s)
- Jenn-Tzong Chang
- Department of Biological Sciences, National Sun Yat-Sen University,
Kaohsiung, Taiwan
- Department of Medical Education and Research, Kaohsiung Veterans General
Hospital, Kaohsiung, Taiwan
- Department of Pediatrics; Kaohsiung Veterans General Hospital, Kaohsiung,
Taiwan
| | - Chih-Shiang Yang
- Department of Medical Education and Research, Kaohsiung Veterans General
Hospital, Kaohsiung, Taiwan
| | - Yao-Shen Chen
- Department of Infectious Diseases, Kaohsiung Veterans General Hospital,
Kaohsiung, Taiwan
| | - Bao-Chen Chen
- Department of Microbiology, Kaohsiung Veterans General Hospital,
Kaohsiung, Taiwan
| | - An-Jen Chiang
- Department of Biological Sciences, National Sun Yat-Sen University,
Kaohsiung, Taiwan
- Department of Obstetrics and Gynecology, Kaohsiung Veterans General
Hospital, Kaohsiung, Taiwan
| | - Yu-Hsiang Chang
- Department of Pediatrics; Kaohsiung Veterans General Hospital, Kaohsiung,
Taiwan
| | - Wei-Lun Tsai
- Division of Gastroenterology, Department of Internal Medicine, Kaohsiung
Veterans General Hospital, Kaohsiung, Taiwan
| | - You-Sheng Lin
- Department of Medical Education and Research, Kaohsiung Veterans General
Hospital, Kaohsiung, Taiwan
| | - David Chao
- Department of Biological Sciences, National Sun Yat-Sen University,
Kaohsiung, Taiwan
| | - Tsung-Hsien Chang
- Department of Medical Education and Research, Kaohsiung Veterans General
Hospital, Kaohsiung, Taiwan
- Department of Pharmacy and Graduate Institute of Pharmaceutical
Technology, Tajen University, Pingtung, Taiwan
- * E-mail:
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22
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Chiang JJ, Davis ME, Gack MU. Regulation of RIG-I-like receptor signaling by host and viral proteins. Cytokine Growth Factor Rev 2014; 25:491-505. [PMID: 25023063 PMCID: PMC7108356 DOI: 10.1016/j.cytogfr.2014.06.005] [Citation(s) in RCA: 85] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Accepted: 06/16/2014] [Indexed: 12/17/2022]
Abstract
Vertebrate innate immunity is characterized by an effective immune surveillance apparatus, evolved to sense foreign structures, such as proteins or nucleic acids of invading microbes. RIG-I-like receptors (RLRs) are key sensors of viral RNA species in the host cell cytoplasm. Activation of RLRs in response to viral RNA triggers an antiviral defense program through the production of hundreds of antiviral effector proteins including cytokines, chemokines, and host restriction factors that directly interfere with distinct steps in the virus life cycle. To avoid premature or abnormal antiviral and proinflammatory responses, which could have harmful consequences for the host, the signaling activities of RLRs and their common adaptor molecule, MAVS, are delicately controlled by cell-intrinsic regulatory mechanisms. Furthermore, viruses have evolved multiple strategies to modulate RLR-MAVS signal transduction to escape from immune surveillance. Here, we summarize recent progress in our understanding of the regulation of RLR signaling through host factors and viral antagonistic proteins.
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Affiliation(s)
- Jessica J Chiang
- Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, United States
| | - Meredith E Davis
- Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, United States
| | - Michaela U Gack
- Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, United States.
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23
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Abstract
Hepatitis A virus (HAV) is a faeco-orally transmitted picornavirus and is one of the main causes of acute hepatitis worldwide. An overview of the molecular biology of HAV is presented with an emphasis on recent findings. Immune evasion strategies and a possible correlation between HAV and atopy are discussed as well. Despite the availability of efficient vaccines, antiviral drugs targeting HAV are required to treat severe cases of fulminant hepatitis, contain outbreaks, and halt the potential spread of vaccine-escape variants. Additionally, such drugs could be used to shorten the period of illness and decrease associated economical costs. Several known inhibitors of HAV with various mechanisms of action will be discussed. Since none of these molecules is readily useable in the clinic and since the availability of an anti-HAV drug would be of clinical importance, increased efforts should be targeted toward discovery and development of such antivirals.
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Affiliation(s)
- Yannick Debing
- Rega Institute for Medical ResearchUniversity of LeuvenLeuvenBelgium
| | - Johan Neyts
- Rega Institute for Medical ResearchUniversity of LeuvenLeuvenBelgium
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24
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Shi J, Duan Z, Sun J, Wu M, Wang B, Zhang J, Wang H, Hu N, Hu Y. Identification and validation of a novel microRNA-like molecule derived from a cytoplasmic RNA virus antigenome by bioinformatics and experimental approaches. Virol J 2014; 11:121. [PMID: 24981144 PMCID: PMC4087238 DOI: 10.1186/1743-422x-11-121] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2014] [Accepted: 06/24/2014] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND It is generally believed that RNA virus replicating in the cell cytoplasm would not encode microRNAs (miRNAs) due to nucleus inaccessibility. Recent studies have described cytoplasmic RNA virus genome-derived miRNAs in West Nile virus (WNV) and Dengue virus (DENV). However, naturally occurring miRNAs derived from the antigenome of a cytoplasmic RNA virus have not been described. METHODS Hepatitis A virus (HAV) was served as a model virus to investigate whether the antigenome of a cytoplasmic RNA virus would be processed into miRNAs or miRNA-like small RNAs upon infection. HAV antigenome was queried for putative miRNA precursors (pre-miRNA) with the VMir analyzer program. Mature miRNA prediction was performed using MatureBayes and Bayes-SVM-MiRNA web server v1.0. Finally, multiple experimental approaches, including cloning and sequencing-, RNAi-, plasmid-based miRNA expression- and luciferase reporter assays, were performed to identify and validate naturally occurring viral antigenome-derived miRNAs. RESULTS Using human HAV genotype IA (isolate H2) (HAVH2), a virally encoded miRNA-like small RNA was detected on the antigenome and named hav-miR-N1-3p. Transcription of viral pre-miRNA in KMB17 and HEK293T cells led to mature hav-miR-N1-3p production. In addition, silencing of the miRNA-processing enzyme Dicer or Drosha caused a dramatic reduction in miRNA levels. Furthermore, artificial target of hav-miR-N1-3p was silenced by synthesized viral miRNA mimics and the HAVH2 naturally-derived hav-miR-N1-3p. CONCLUSION These results suggested that the antigenome of a cytoplasmic RNA virus could be processed into functional miRNAs. Our findings provide new evidence supporting the hypothesis that cytoplasmic RNA viruses naturally encode miRNAs through cellular miRNA processing machinery.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Yunzhang Hu
- Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Diseases, Institute of Medical Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Kunming 650118, China.
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25
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Lam AR, Bert NL, Ho SS, Shen YJ, Tang LF, Xiong GM, Croxford JL, Koo CX, Ishii KJ, Akira S, Raulet DH, Gasser S. RAE1 ligands for the NKG2D receptor are regulated by STING-dependent DNA sensor pathways in lymphoma. Cancer Res 2014; 74:2193-2203. [PMID: 24590060 DOI: 10.1158/0008-5472.can-13-1703] [Citation(s) in RCA: 119] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The immunoreceptor NKG2D originally identified in natural killer (NK) cells recognizes ligands that are upregulated on tumor cells. Expression of NKG2D ligands (NKG2DL) is induced by the DNA damage response (DDR), which is often activated constitutively in cancer cells, revealing them to NK cells as a mechanism of immunosurveillance. Here, we report that the induction of retinoic acid early transcript 1 (RAE1) ligands for NKG2D by the DDR relies on a STING-dependent DNA sensor pathway involving the effector molecules TBK1 and IRF3. Cytosolic DNA was detected in lymphoma cell lines that express RAE1 and its occurrence required activation of the DDR. Transfection of DNA into ligand-negative cells was sufficient to induce RAE1 expression. Irf3(+/-);Eμ-Myc mice expressed lower levels of RAE1 on tumor cells and showed a reduced survival rate compared with Irf3(+/+);Eμ-Myc mice. Taken together, our results suggest that genomic damage in tumor cells leads to activation of STING-dependent DNA sensor pathways, thereby activating RAE1 and enabling tumor immunosurveillance.
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Affiliation(s)
- Adeline R Lam
- Immunology Programme and Department of Microbiology, Centre for Life Sciences, National University of Singapore, 117456, Singapore.,NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 117597 Singapore
| | - Nina Le Bert
- Immunology Programme and Department of Microbiology, Centre for Life Sciences, National University of Singapore, 117456, Singapore
| | - Samantha Sw Ho
- Immunology Programme and Department of Microbiology, Centre for Life Sciences, National University of Singapore, 117456, Singapore
| | - Yu J Shen
- Immunology Programme and Department of Microbiology, Centre for Life Sciences, National University of Singapore, 117456, Singapore.,NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 117597 Singapore
| | - Li Fm Tang
- Immunology Programme and Department of Microbiology, Centre for Life Sciences, National University of Singapore, 117456, Singapore
| | - Gordon M Xiong
- Immunology Programme and Department of Microbiology, Centre for Life Sciences, National University of Singapore, 117456, Singapore
| | - John L Croxford
- Immunology Programme and Department of Microbiology, Centre for Life Sciences, National University of Singapore, 117456, Singapore
| | - Christine X Koo
- Immunology Programme and Department of Microbiology, Centre for Life Sciences, National University of Singapore, 117456, Singapore.,NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 117597 Singapore.,Laboratory of Adjuvant Innovation, National Institute of Biomedical Innovation (NIBIO), 7-6-8 Saito-Asagi, Ibaraki, Osaka, Japan.,Laboratory of Vaccine Science, WPI Immunology Frontier Research Center (iFREC), Osaka University, 3-1 Yamadaoka, Suita, Osaka, Japan
| | - Ken J Ishii
- Laboratory of Adjuvant Innovation, National Institute of Biomedical Innovation (NIBIO), 7-6-8 Saito-Asagi, Ibaraki, Osaka, Japan.,Laboratory of Vaccine Science, WPI Immunology Frontier Research Center (iFREC), Osaka University, 3-1 Yamadaoka, Suita, Osaka, Japan
| | - Shizuo Akira
- WPI Immunology Frontier Research Center (iFREC), Osaka University, 3-1 Yamadaoka, Suita, Osaka, Japan
| | - David H Raulet
- Department of Molecular and Cell Biology and Cancer Research Laboratory, University of California, Berkeley, CA 94720-3200, USA
| | - Stephan Gasser
- Immunology Programme and Department of Microbiology, Centre for Life Sciences, National University of Singapore, 117456, Singapore.,NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 117597 Singapore
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26
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Paulmann D, Bortmann S, Grimm F, Berk I, Kraemer L, Vallbracht A, Dotzauer A. NF-κB activation induced by hepatitis A virus and Newcastle disease virus occurs by different pathways depending on the structural pattern of viral nucleic acids. Arch Virol 2014; 159:1723-33. [PMID: 24473712 DOI: 10.1007/s00705-014-1993-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2013] [Accepted: 01/16/2014] [Indexed: 12/24/2022]
Abstract
NF-κB is activated by hepatitis B virus and hepatitis C virus and is assumed to contribute to viral persistence, leading to the development of hepatocellular cancer by inhibition of apoptosis mediated by cytotoxic T cells. Whether hepatitis A virus (HAV), which does not cause chronic infection, activates NF-κB is a topic of controversy. Here, we confirm that HAV activates NF-κB and show that HAV enhances the activation of NF-κB by poly(I-C), but it inhibits the activation of NF-κB by Newcastle disease virus (NDV), a paramyxovirus. In addition, HAV inhibits NF-κB activation induced by overexpressed MAVS (mitochondrial antiviral signaling protein). We conclude from these findings that NF-κB induction occurs in cells infected with HAV by dsRNA, independently of mitochondrial-transduced RIG-I/MDA-5 signaling, whereas the induction of NF-κB in cells infected by NDV is mediated by RIG-I signaling, independenly of viral dsRNA. This is supported by experiments in which the different RNA inducers of RIG-I and MDA-5 are sequestered and which also show that poly(I-C) and HAV, but not NDV, are functionally equivalent in inducing NF-κB activity. Furthermore, we demonstrate that HAV interferes with the protein kinase R (PKR) activity and PKR activation induced by dsRNA, and that HAV-induced activation of NF-κB therefore does not take place via the PKR-induced pathway. As assumed for hepatitis B and C virus infections, NF-κB activation could attenuate the effects of cytotoxic T cells and may contribute to prolonged as well as relapsing courses of hepatitis A.
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Affiliation(s)
- Dajana Paulmann
- Department of Virology, University of Bremen, Leobener Straße/UFT, 28359, Bremen, Germany
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27
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Phan C, Hollinger FB. Hepatitis A: Natural history, immunopathogenesis, and outcome. Clin Liver Dis (Hoboken) 2013; 2:231-234. [PMID: 30992869 PMCID: PMC6448663 DOI: 10.1002/cld.253] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Affiliation(s)
- Charles Phan
- Departments of Medicine, Molecular Virology, and Surgery, Baylor/St. Luke's Liver CenterBaylor College of MedicineHoustonTX.
| | - F. Blaine Hollinger
- Departments of Medicine, Molecular Virology, and Surgery, Baylor/St. Luke's Liver CenterBaylor College of MedicineHoustonTX.
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28
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Fierro NA, Castro-Garcia FP, Panduro A. Rethinking cytokine function during hepatitis A and hepatitis C infections. ACTA ACUST UNITED AC 2013. [DOI: 10.4236/abb.2013.47a1003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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29
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Pintó RM, D'Andrea L, Pérez-Rodriguez FJ, Costafreda MI, Ribes E, Guix S, Bosch A. Hepatitis A virus evolution and the potential emergence of new variants escaping the presently available vaccines. Future Microbiol 2012; 7:331-46. [PMID: 22393888 DOI: 10.2217/fmb.12.5] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Hepatitis A is the most common infection of the liver worldwide and is fecal-orally transmitted. Its incidence tends to decrease with improvements in hygiene conditions but at the same time its severity increases. Hepatitis A virus is the causative agent of acute hepatitis in humans and belongs to the Hepatovirus genus in the Picornaviridae family, and it has very unique characteristics. This article reviews some molecular and biological properties that allow the virus to live in a very quiescent way and to build an extremely stable capsid that is able to persist in and out of the body. Additionally, the relationship between the genomic composition and the structural and antigenic properties of the capsid is discussed, and the potential emergence of antigenic variants is evaluated from an evolutionary perspective.
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Affiliation(s)
- Rosa M Pintó
- Enteric Virus Laboratory, School of Biology, University of Barcelona, Barcelona, Spain.
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30
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Dotzauer A, Kraemer L. Innate and adaptive immune responses against picornaviruses and their counteractions: An overview. World J Virol 2012; 1:91-107. [PMID: 24175214 PMCID: PMC3782268 DOI: 10.5501/wjv.v1.i3.91] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/08/2011] [Revised: 02/22/2012] [Accepted: 05/20/2012] [Indexed: 02/05/2023] Open
Abstract
Picornaviruses, small positive-stranded RNA viruses, cause a wide range of diseases which is based on their differential tissue and cell type tropisms. This diversity is reflected by the immune responses, both innate and adaptive, induced after infection, and the subsequent interactions of the viruses with the immune system. The defense mechanisms of the host and the countermeasures of the virus significantly contribute to the pathogenesis of the infections. Important human pathogens are poliovirus, coxsackievirus, human rhinovirus and hepatitis A virus. These viruses are the best-studied members of the family, and in this review we want to present the major aspects of the reciprocal effects between the immune system and these viruses.
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Affiliation(s)
- Andreas Dotzauer
- Andreas Dotzauer, Leena Kraemer, Department of Virology, University of Bremen, 28359 Bremen, Germany
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31
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Dong C, Zafrullah M, Mixson-Hayden T, Dai X, Liang J, Meng J, Kamili S. Suppression of interferon-α signaling by hepatitis E virus. Hepatology 2012; 55:1324-32. [PMID: 22183878 DOI: 10.1002/hep.25530] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/15/2011] [Accepted: 11/02/2011] [Indexed: 12/11/2022]
Abstract
UNLABELLED The interferon (IFN) system is integral to the host response against viruses, and many viruses have developed strategies to overcome its antiviral effects. The effects of hepatitis E virus (HEV), the causative agent of hepatitis E, on IFN signaling have not been investigated primarily because of the nonavailability of an efficient in vitro culture system or small animal models of infection. We report here the generation of A549 cell lines persistently infected with genotype 3 HEV, designated as HEV-A549 cells and the effects HEV has on IFN-α-mediated Janus kinase-signal transducer and activator of transcription (JAK-STAT) signaling. Treatment of HEV-A549 cells with 250, 500, and 1000 U/mL of IFN-α for 72 hours showed a dose-dependent reduction in HEV RNA levels by 10%, 20%, and 50%, respectively. IFN-α-stimulated genes coding for the antiviral proteins dsRNA-activated protein kinase (PKR) and 2',5'-oligoadenylate synthetase (2',5'-OAS) were down-regulated in IFN-α-treated HEV-A549 cells. HEV infection also prevented IFN-α-induced phosphorylation of STAT1. Regulation of STAT1 by HEV was specific, as phosphorylation of STAT2, tyrosine kinase (Tyk) 2, and Jak1 by IFN-α was unaltered. Additionally, STAT1 levels were markedly increased in HEV-A549 cells compared with naive A549 cells. Furthermore, binding of HEV open reading frame (ORF)3 protein to STAT1 in HEV-A549 cells was observed. HEV ORF3 protein alone inhibited IFN-α-induced phosphorylation of STAT1 and down-regulated the IFN-α-stimulated genes encoding PKR, 2',5'-OAS, and myxovirus resistance A. CONCLUSION HEV inhibits IFN-α signaling through the regulation of STAT1 phosphorylation in A549 cells. These findings have implications for the development of new strategies against hepatitis E.
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Affiliation(s)
- Chen Dong
- Division of Viral Hepatitis, Centers for Disease Control and Prevention, Atlanta, GA, USA
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32
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Sawhney R, Visvanathan K. Polymorphisms of toll-like receptors and their pathways in viral hepatitis. Antivir Ther 2011; 16:443-58. [PMID: 21685532 DOI: 10.3851/imp1820] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Toll-like receptors (TLRs) are an important part of the innate immune response to a variety of pathogens including hepatic viral infections. Activation of TLRs stimulates a complex intracellular signalling cascade that results in production of proinflammatory cytokines and interferons important for antiviral responses as well as induction of the adaptive arm of the immune system. There is substantial evidence for an important role for TLRs and TLR-mediated signalling in the pathogenesis and outcomes of hepatitis B and C in particular, but it might also influence responses to other viral hepatitis infections. Several single nucleotide polymorphisms (SNPs) of TLRs, relevant adaptor molecules and cytokines mediated by TLR signalling have been described that alter innate immune responses and have been implicated in a variety of human diseases including viral and other infections. There is now significant evidence that a number of TLR SNPs can affect various clinical outcomes in Caucasian patients with chronic HCV. However, the role of these polymorphisms in acute and other chronic hepatitis infections, including HBV as well as in non-Caucasian populations, has not been elucidated. In addition, results for SNPs downstream of TLR activation, such as in relevant cytokines, are inconsistent and their influence requires further investigation to determine the clinical significance of genetic variations in these mediators.
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Affiliation(s)
- Rohit Sawhney
- Innate Immunity Laboratory, Department of Medicine, Monash University, Melbourne, Australia
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33
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Qu L, Feng Z, Yamane D, Liang Y, Lanford RE, Li K, Lemon SM. Disruption of TLR3 signaling due to cleavage of TRIF by the hepatitis A virus protease-polymerase processing intermediate, 3CD. PLoS Pathog 2011; 7:e1002169. [PMID: 21931545 PMCID: PMC3169542 DOI: 10.1371/journal.ppat.1002169] [Citation(s) in RCA: 111] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2011] [Accepted: 06/01/2011] [Indexed: 01/19/2023] Open
Abstract
Toll-like receptor 3 (TLR3) and cytosolic RIG-I-like helicases (RIG-I and MDA5) sense viral RNAs and activate innate immune signaling pathways that induce expression of interferon (IFN) through specific adaptor proteins, TIR domain-containing adaptor inducing interferon-β (TRIF), and mitochondrial antiviral signaling protein (MAVS), respectively. Previously, we demonstrated that hepatitis A virus (HAV), a unique hepatotropic human picornavirus, disrupts RIG-I/MDA5 signaling by targeting MAVS for cleavage by 3ABC, a precursor of the sole HAV protease, 3C(pro), that is derived by auto-processing of the P3 (3ABCD) segment of the viral polyprotein. Here, we show that HAV also disrupts TLR3 signaling, inhibiting poly(I:C)-stimulated dimerization of IFN regulatory factor 3 (IRF-3), IRF-3 translocation to the nucleus, and IFN-β promoter activation, by targeting TRIF for degradation by a distinct 3ABCD processing intermediate, the 3CD protease-polymerase precursor. TRIF is proteolytically cleaved by 3CD, but not by the mature 3C(pro) protease or the 3ABC precursor that degrades MAVS. 3CD-mediated degradation of TRIF depends on both the cysteine protease activity of 3C(pro) and downstream 3D(pol) sequence, but not 3D(pol) polymerase activity. Cleavage occurs at two non-canonical 3C(pro) recognition sequences in TRIF, and involves a hierarchical process in which primary cleavage at Gln-554 is a prerequisite for scission at Gln-190. The results of mutational studies indicate that 3D(pol) sequence modulates the substrate specificity of the upstream 3C(pro) protease when fused to it in cis in 3CD, allowing 3CD to target cleavage sites not normally recognized by 3C(pro). HAV thus disrupts both RIG-I/MDA5 and TLR3 signaling pathways through cleavage of essential adaptor proteins by two distinct protease precursors derived from the common 3ABCD polyprotein processing intermediate.
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Affiliation(s)
- Lin Qu
- Lineberger Comprehensive Cancer Center and the Division of Infectious Diseases, Department of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Zongdi Feng
- Lineberger Comprehensive Cancer Center and the Division of Infectious Diseases, Department of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Daisuke Yamane
- Lineberger Comprehensive Cancer Center and the Division of Infectious Diseases, Department of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Yuqiong Liang
- Lineberger Comprehensive Cancer Center and the Division of Infectious Diseases, Department of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Robert E. Lanford
- Department of Virology and Immunology, Texas Biomedical Research Institute, San Antonio, Texas, United States of America
| | - Kui Li
- Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center, Memphis, Tennessee, United States of America
| | - Stanley M. Lemon
- Lineberger Comprehensive Cancer Center and the Division of Infectious Diseases, Department of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
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Schulte I, Hitziger T, Giugliano S, Timm J, Gold H, Heinemann FM, Khudyakov Y, Strasser M, König C, Castermans E, Mok JY, van Esch WJE, Bertoletti A, Schumacher TN, Roggendorf M. Characterization of CD8+ T-cell response in acute and resolved hepatitis A virus infection. J Hepatol 2011; 54:201-8. [PMID: 21056495 DOI: 10.1016/j.jhep.2010.07.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2010] [Revised: 07/08/2010] [Accepted: 07/12/2010] [Indexed: 12/11/2022]
Abstract
BACKGROUND & AIMS In contrast to the infection with other hepatotropic viruses, hepatitis A virus (HAV) always causes acute self-limited hepatitis, although the role for virus-specific CD8 T cells in viral containment is unclear. Herein, we analyzed the T cell response in patients with acute hepatitis by utilizing a set of overlapping peptides and predicted HLA-A2 binders from the polyprotein. METHODS A set of 11 predicted peptides from the HAV polyprotein, identified as potential binders, were synthesized. Peripheral blood mononuclear cells (PBMCs) from patients were tested for IFNγ secretion after stimulation with these peptides and ex vivo with HLA-A2 tetramers. Phenotyping was carried out by staining with the activation marker CD38 and the memory marker CD127. RESULTS Eight out of 11 predicted HLA-A2 binders showed a high binding affinity and five of them were recognized by CD8+ T cells from patients with hepatitis A. There were significant differences in the magnitude of the responses to these five peptides. One was reproducibly immunodominant and the only one detectable ex vivo by tetramer staining of CD8+ T cells. These cells have an activated phenotype (CD38hi CD127lo) during acute infection. Three additional epitopes were identified in HLA-A2 negative patients, most likely representing epitopes restricted by other HLA-class I-alleles (HLA-A11, B35, B40). CONCLUSIONS Patients with acute hepatitis A have a strong multi-specific T cell response detected by ICS. With the tetramer carrying the dominant HLA-A2 epitope, HAV-specific and activated CD8+ T cells could be detected ex vivo. This first description of the HAV specific CTL-epitopes will allow future studies on strength, breadth, and kinetics of the T-cell response in hepatitis A.
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Affiliation(s)
- I Schulte
- Institute of Virology, University of Duisburg-Essen, Virchowstrasse 179, D-45147 Essen, Germany
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Yang L, Kiyohara T, Kanda T, Imazeki F, Fujiwara K, Gauss-Müller V, Ishii K, Wakita T, Yokosuka O. Inhibitory effects on HAV IRES-mediated translation and replication by a combination of amantadine and interferon-alpha. Virol J 2010; 7:212. [PMID: 20815893 PMCID: PMC2940810 DOI: 10.1186/1743-422x-7-212] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2010] [Accepted: 09/03/2010] [Indexed: 12/30/2022] Open
Abstract
Hepatitis A virus (HAV) causes acute hepatitis and sometimes leads to fulminant hepatitis. Amantadine is a tricyclic symmetric amine that inhibits the replication of many DNA and RNA viruses. Amantadine was reported to suppress HAV replication, and the efficacy of amantadine was exhibited in its inhibition of the internal ribosomal entry site (IRES) activities of HAV. Interferon (IFN) also has an antiviral effect through the induction of IFN stimulated genes (ISG) and the degradation of viral RNA. To explore the mechanism of the suppression of HAV replication, we examined the effects of the combination of amantadine and IFN-alpha on HAV IRES-mediated translation, HAV replicon replication in human hepatoma cell lines, and HAV KRM003 genotype IIIB strain replication in African green monkey kidney cell GL37. IFN-alpha seems to have no additive effect on HAV IRES-mediated translation inhibition by amantadine. However, suppressions of HAV replicon and HAV replication were stronger with the combination than with amantadine alone. In conclusion, amantadine, in combination of IFN-alpha, might have a beneficial effect in some patients with acute hepatitis A.
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Affiliation(s)
- Lingli Yang
- Department of Medicine and Clinical Oncology, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan
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Viren mit einzelsträngigem RNA-Genom in Plusstrangorientierung. MOLEKULARE VIROLOGIE 2010. [PMCID: PMC7120496 DOI: 10.1007/978-3-8274-2241-5_14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Heute sind acht Virusfamilien bekannt, deren Vertreter eine einzelsträngige RNA in Plusstrangorientierung besitzen: Die Picornaviridae, Caliciviridae, Astroviridae und Hepeviren verfügen über Capside, die keine Hüllmembran aufweisen, wohingegen die Flaviviridae, Togaviridae, Arteriviridae und Coronaviridae durch membranumhüllte Partikel gekennzeichnet sind. Allen gemeinsam ist, dass sie ihre Genome als mRNA verwenden und davon ein oder mehrere Polyproteine synthetisieren, die im weiteren Verlauf durch virale oder auch zelluläre Proteasen in Einzelkomponenten gespalten werden. Die Viren verfügen über eine RNA-abhängige RNA-Polymerase, welche die Plusstrang-RNA sowie die als Zwischenprodukte der Replikation auftretenden Negativstränge übersetzt; dabei gehen die neuen genomischen RNA-Moleküle aus dem zweiten Transkriptionsschritt hervor. Die Einteilung in die unterschiedlichen Familien richtet sich nach Zahl, Größe, Lage und Orientierung der Virusgene auf der RNA, nach der Anzahl der unterschiedlichen Polyproteine, die während der Infektion synthetisiert werden, und nach dem Vorhandensein einer Hüllmembran als Teil der Virionen.
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Wang Q, Nagarkar DR, Bowman ER, Schneider D, Gosangi B, Lei J, Zhao Y, McHenry CL, Burgens RV, Miller DJ, Sajjan U, Hershenson MB. Role of double-stranded RNA pattern recognition receptors in rhinovirus-induced airway epithelial cell responses. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2009; 183:6989-97. [PMID: 19890046 PMCID: PMC2920602 DOI: 10.4049/jimmunol.0901386] [Citation(s) in RCA: 191] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Rhinovirus (RV), a ssRNA virus of the picornavirus family, is a major cause of the common cold as well as asthma and chronic obstructive pulmonary disease exacerbations. Viral dsRNA produced during replication may be recognized by the host pattern recognition receptors TLR-3, retinoic acid-inducible gene (RIG)-I, and melanoma differentiation-associated gene (MDA)-5. No study has yet identified the receptor required for sensing RV dsRNA. To examine this, BEAS-2B human bronchial epithelial cells were infected with intact RV-1B or replication-deficient UV-irradiated virus, and IFN and IFN-stimulated gene expression was determined by quantitative PCR. The separate requirements of RIG-I, MDA5, and IFN response factor (IRF)-3 were determined using their respective small interfering RNAs (siRNA). The requirement of TLR3 was determined using siRNA against the TLR3 adaptor molecule Toll/IL-1R homologous region-domain-containing adapter-inducing IFN-beta (TRIF). Intact RV-1B, but not UV-irradiated RV, induced IRF3 phosphorylation and dimerization, as well as mRNA expression of IFN-beta, IFN-lambda1, IFN-lambda2/3, IRF7, RIG-I, MDA5, 10-kDa IFN-gamma-inducible protein/CXCL10, IL-8/CXCL8, and GM-CSF. siRNA against IRF3, MDA5, and TRIF, but not RIG-I, decreased RV-1B-induced expression of IFN-beta, IFN-lambda1, IFN-lambda2/3, IRF7, RIG-I, MDA5, and inflammatory protein-10/CXCL10 but had no effect on IL-8/CXCL8 and GM-CSF. siRNAs against MDA5 and TRIF also reduced IRF3 dimerization. Finally, in primary cells, transfection with MDA5 siRNA significantly reduced IFN expression, as it did in BEAS-2B cells. These results suggest that TLR3 and MDA5, but not RIG-I, are required for maximal sensing of RV dsRNA and that TLR3 and MDA5 signal through a common downstream signaling intermediate, IRF3.
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Affiliation(s)
- Qiong Wang
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor
| | - Deepti R. Nagarkar
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor
| | - Emily R. Bowman
- Department of Pediatrics and Communicable Disease, University of Michigan, Ann Arbor
| | - Dina Schneider
- Department of Pediatrics and Communicable Disease, University of Michigan, Ann Arbor
| | - Babina Gosangi
- Department of Pediatrics and Communicable Disease, University of Michigan, Ann Arbor
| | - Jing Lei
- Department of Pediatrics and Communicable Disease, University of Michigan, Ann Arbor
| | - Ying Zhao
- Department of Pediatrics and Communicable Disease, University of Michigan, Ann Arbor
| | - Christina L. McHenry
- Department of Pediatrics and Communicable Disease, University of Michigan, Ann Arbor
| | - Richai V. Burgens
- Department of Pediatrics and Communicable Disease, University of Michigan, Ann Arbor
| | - David J. Miller
- Department of Internal Medicine, University of Michigan, Ann Arbor
| | - Umadevi Sajjan
- Department of Pediatrics and Communicable Disease, University of Michigan, Ann Arbor
| | - Marc B. Hershenson
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor
- Department of Pediatrics and Communicable Disease, University of Michigan, Ann Arbor
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Interactions between viral and prokaryotic pathogens in a mixed infection with cardiovirus and mycoplasma. J Virol 2009; 83:9940-51. [PMID: 19605479 DOI: 10.1128/jvi.01167-09] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
In the natural environment, animal and plant viruses often share ecological niches with microorganisms, but the interactions between these pathogens, although potentially having important implications, are poorly investigated. The present report demonstrates, in a model system, profound mutual effects of mycoplasma and cardioviruses in animal cell cultures. In contrast to mycoplasma-free cells, cultures contaminated with Mycoplasma hyorhinis responded to infection with encephalomyocarditis virus (EMCV), a picornavirus, but not with poliovirus (also a picornavirus), with a strong activation of a DNase(s), as evidenced by the TUNEL (terminal deoxynucleotidyltransferase-mediated dUTP-biotin nick end labeling) immunofluorescence assay and electrophoretic analysis of host DNA. This degradation was reminiscent of that observed upon apoptosis but was caspase independent, judging by the failure of the specific pan-caspase inhibitor Q-VD-OPh to prevent it. The electrophoretic mobility of the enzyme responsible for DNA degradation and dependence of its activity on ionic conditions strongly suggested that it was represented by a DNase(s) of mycoplasma origin. In cells not infected with EMCV, the relevant DNase was dormant. The possibility is discussed that activation of the mycoplasma DNase might be linked to a relatively early increase in permeability of plasma membrane of the infected cells caused by EMCV. This type of unanticipated virus-mycoplasma "cooperation" may exemplify the complexity of pathogen-host interactions under conditions when viruses and microorganisms are infecting the same host. In the course of the present study, it was also demonstrated that pan-caspase inhibitor zVAD(OMe).fmk strongly suppressed cardiovirus polyprotein processing, illustrating an additional pitfall in investigations of viral effects on the apoptotic system of host cells.
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Kulka M, Calvo MS, Ngo DT, Wales SQ, Goswami BB. Activation of the 2-5OAS/RNase L pathway in CVB1 or HAV/18f infected FRhK-4 cells does not require induction of OAS1 or OAS2 expression. Virology 2009; 388:169-84. [PMID: 19383565 DOI: 10.1016/j.virol.2009.03.014] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2009] [Revised: 02/09/2009] [Accepted: 03/14/2009] [Indexed: 01/23/2023]
Abstract
The latent, constitutively expressed protein RNase L is activated in coxsackievirus and HAV strain 18f infected FRhK-4 cells. Endogenous oligoadenylate synthetase (OAS) from uninfected and virus infected cell extracts synthesizes active forms of the triphosphorylated 2-5A oligomer (the only known activator of RNase L) in vitro and endogenous 2-5A is detected in infected cell extracts. However, only the largest OAS isoform, OAS3, is readily detected throughout the time course of infection. While IFNbeta treatment results in an increase in the level of all three OAS isoforms in FRhK-4 cells, IFNbeta pretreatment does not affect the temporal onset or enhancement of RNase L activity nor inhibit virus replication. Our results indicate that CVB1 and HAV/18f activate the 2-5OAS/RNase L pathway in FRhK-4 cells during permissive infection through endogenous levels of OAS, but contrary to that reported for some picornaviruses, CVB1 and HAV/18f replication is insensitive to this activated antiviral pathway.
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Affiliation(s)
- Michael Kulka
- Division of Molecular Biology, Office of Applied Research and Safety Assessment, Center for Food Safety and Applied Nutrition, US Food and Drug Administration, Laurel, MD 20708, USA.
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Matsumiya T, Imaizumi T, Yoshida H, Satoh K, Topham MK, Stafforini DM. The levels of retinoic acid-inducible gene I are regulated by heat shock protein 90-alpha. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2009; 182:2717-25. [PMID: 19234166 PMCID: PMC2722243 DOI: 10.4049/jimmunol.0802933] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Retinoic acid-inducible gene I (RIG-I) is an intracellular pattern recognition receptor that plays important roles during innate immune responses to viral dsRNAs. The mechanisms and signaling molecules that participate in the downstream events that follow activation of RIG-I are incompletely characterized. In addition, the factors that define intracellular availability of RIG-I and determine its steady-state levels are only partially understood but are likely to play a major role during innate immune responses. It was recently reported that the antiviral activity of RIG-I is negatively regulated by specific E3 ubiquitin ligases, suggesting participation of the proteasome in the regulation of RIG-I levels. In this study, we used immunoprecipitation combined with mass spectrometry to identify RIG-I-interacting proteins and found that RIG-I forms part of a protein complex that includes heat shock protein 90-alpha (HSP90-alpha), a molecular chaperone. Biochemical studies using purified systems demonstrated that the association between RIG-I and HSP90-alpha is direct but does not involve participation of the CARD domain. Inhibition of HSP90 activity leads to the dissociation of the RIG-I-HSP90 complex, followed by ubiquitination and proteasomal degradation of RIG-I. In contrast, the levels of RIG-I mRNA are unaffected. Our studies also show that the ability of RIG-I to respond to stimulation with polyinosinic:polycytidylic acid is abolished when its interaction with HSP90 is inhibited. These novel findings point to HSP90-alpha as a chaperone that shields RIG-I from proteasomal degradation and modulates its activity. These studies identify a new mechanism whose dysregulation may seriously compromise innate antiviral responses in mammals.
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Affiliation(s)
- Tomoh Matsumiya
- Huntsman Cancer Institute, University of Utah, Salt Lake City, Utah 84112-5550, U.S.A
- Department of Vascular Biology, Institute of Brain Sciences, Hirosaki University Graduate School of Medicine, Hirosaki City, 036-8562, Japan
| | - Tadaatsu Imaizumi
- Department of Vascular Biology, Institute of Brain Sciences, Hirosaki University Graduate School of Medicine, Hirosaki City, 036-8562, Japan
| | - Hidemi Yoshida
- Department of Vascular Biology, Institute of Brain Sciences, Hirosaki University Graduate School of Medicine, Hirosaki City, 036-8562, Japan
| | - Kei Satoh
- Department of Vascular Biology, Institute of Brain Sciences, Hirosaki University Graduate School of Medicine, Hirosaki City, 036-8562, Japan
| | - Matthew K. Topham
- Huntsman Cancer Institute, University of Utah, Salt Lake City, Utah 84112-5550, U.S.A
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah 84112-5550, U.S.A
| | - Diana M. Stafforini
- Huntsman Cancer Institute, University of Utah, Salt Lake City, Utah 84112-5550, U.S.A
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah 84112-5550, U.S.A
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Mucida D, Park Y, Cheroutre H. From the diet to the nucleus: vitamin A and TGF-beta join efforts at the mucosal interface of the intestine. Semin Immunol 2009; 21:14-21. [PMID: 18809338 PMCID: PMC2643336 DOI: 10.1016/j.smim.2008.08.001] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2008] [Revised: 08/03/2008] [Accepted: 08/05/2008] [Indexed: 10/21/2022]
Abstract
The vitamin A metabolites, including retinoic acid (RA), form ligands for retinoic acid-related nuclear receptors and together they play pleiotropic roles in various biological processes. Recently, we described that RA also functions as a key modulator of transforming growth factor-beta (TGF-beta)-driven immune deviation, capable of suppressing the differentiation of interleukin-17 secreting T helper cells (T(H)17) and conversely promoting the generation of Foxp3(+) T regulatory (Treg) cells. This review will focus on the role of RA in the reciprocal TGF-beta-driven differentiation of T(H)17 and Treg and on the importance of such regulatory mechanism to control a functional immune system, in particular at the mucosal interface of the intestine.
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Affiliation(s)
- Daniel Mucida
- La Jolla Institute for Allergy and Immunology, 9420 Athena Circle, La Jolla, CA 92037, USA
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Jun EJ, Kim YK. Activation of Innate Immune System During Viral Infection: Role of Pattern-recognition Receptors (PRRs) in Viral Infection. ACTA ACUST UNITED AC 2009. [DOI: 10.4167/jbv.2009.39.3.145] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- Eun Jung Jun
- Department of Microbiology, University of Ulsan College of Medicine, Seoul, Korea
| | - Yoo Kyum Kim
- Department of Microbiology, University of Ulsan College of Medicine, Seoul, Korea
- Research Institute for Biomacromolecules, University of Ulsan College of Medicine, Seoul, Korea
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Abstract
Interferons represent a family of cytokines, which is of central importance in the innate immune response to virus infections. All interferons act as secreted ligands of specific cell surface receptors, eliciting the transcription of hundreds of interferon-stimulated genes whose protein products have antiviral activity, as well as antimicrobial, antiproliferative/antitumor, and immunomodulatory effects. Expression of type I and III interferons is induced in virtually all cell types upon recognition of viral molecular patterns, especially nucleic acids, by cytoplasmic and endosomal receptors, whereas type II interferon is induced by cytokines such as IL-12, and its expression is restricted to immune cells such as T cells and NK cells. The effectiveness of the interferon system in counteracting viral infections is reflected by the multitude of inhibitors of interferon induction or interferon action that are encoded by many viruses, preventing their eradication and resulting in the continued coexistence of viruses and vertebrates. The unique biological functions of interferons have led to their therapeutic use in the treatment of diseases such as hepatitis, multiple sclerosis, and certain leukemias.
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Affiliation(s)
- Volker Fensterl
- Department of Molecular Genetics, The Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195, USA
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Peri P, Mattila RK, Kantola H, Broberg E, Karttunen HS, Waris M, Vuorinen T, Hukkanen V. Herpes simplex virus type 1 Us3 gene deletion influences toll-like receptor responses in cultured monocytic cells. Virol J 2008; 5:140. [PMID: 19025601 PMCID: PMC2605447 DOI: 10.1186/1743-422x-5-140] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2008] [Accepted: 11/21/2008] [Indexed: 12/12/2022] Open
Abstract
Background Toll-like receptors have a key role in innate immune response to microbial infection. The toll-like receptor (TLR) family consists of ten identified human TLRs, of which TLR2 and TLR9 have been shown to initiate innate responses to herpes simplex virus type 1 (HSV-1) and TLR3 has been shown to be involved in defence against severe HSV-1 infections of the central nervous system. However, no significant activation of the TLR3 pathways has been observed in wild type HSV-1 infections. In this work, we have studied the TLR responses and effects on TLR gene expression by HSV-1 with Us3 and ICP4 gene deletions, which also subject infected cells to apoptosis in human monocytic (U937) cell cultures. Results U937 human monocytic cells were infected with the Us3 and ICP4 deletion herpes simplex virus (d120), its parental virus HSV-1 (KOS), the Us3 deletion virus (R7041), its rescue virus (R7306) or wild type HSV-1 (F). The mRNA expression of TLR2, TLR3, TLR4, TLR9 and type I interferons (IFN) were analyzed by quantitative real-time PCR. The intracellular expression of TLR3 and type I IFN inducible myxovirus resistance protein A (MxA) protein as well as the level of apoptosis were analyzed by flow cytometry. We observed that the mRNA expression of TLR3 and type I IFNs were significantly increased in d120, R7041 and HSV-1 (F)-infected U937 cells. Moreover, the intracellular expression of TLR3 and MxA were significantly increased in d120 and R7041-infected cells. We observed activation of IRF-3 in infections with d120 and R7041. The TLR4 mRNA expression level was significantly decreased in d120 and R7041-infected cells but increased in HSV-1 (KOS)-infected cells in comparison with uninfected cells. No significant difference in TLR2 or TLR9 mRNA expression levels was seen. Both the R7041 and d120 viruses were able to induce apoptosis in U937 cell cultures. Conclusion The levels of TLR3 and type I IFN mRNA were increased in d120, R7041 and HSV-1 (F)-infected cells when compared with uninfected cells. Also IRF-3 was activated in cells infected with the Us3 gene deletion viruses d120 and R7041. This is consistent with activation of TLR3 signaling in the cells. The intracellular TLR3 and type I IFN inducible MxA protein levels were increased in d120 and R7041-infected cells but not in cells infected with the corresponding parental or rescue viruses, suggesting that the HSV-1 Us3 gene is involved in control of TLR3 responses in U937 cells.
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Affiliation(s)
- Piritta Peri
- Department of Virology, University of Turku, Kiinamyllynkatu 13, 20520 Turku, Finland.
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Komuro A, Bamming D, Horvath CM. Negative regulation of cytoplasmic RNA-mediated antiviral signaling. Cytokine 2008; 43:350-8. [PMID: 18703349 DOI: 10.1016/j.cyto.2008.07.011] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2008] [Accepted: 07/22/2008] [Indexed: 12/19/2022]
Abstract
The recent, rapid progress in our understanding of cytoplasmic RNA-mediated antiviral innate immune signaling was initiated by the discovery of retinoic acid-inducible gene I (RIG-I) as a sensor of viral RNA. It is now widely recognized that RIG-I and related RNA helicases, melanoma differentiation-associated gene-5 (MDA5) and laboratory of genetics and physiology-2 (LGP2), can initiate and/or regulate RNA and virus-mediated type I IFN production and antiviral responses. As with other cytokine systems, production of type I IFN is a transient process, and can be hazardous to the host if unregulated, resulting in chronic cellular toxicity or inflammatory and autoimmune diseases. In addition, the RIG-I-like receptor (RLR) system is a fundamental target for virus-encoded immune suppression, with many indirect and direct examples of interference described. In this article, we review the current understanding of endogenous negative regulation in RLR signaling and explore direct inhibition of RLR signaling by viruses as a host immune evasion strategy.
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Affiliation(s)
- Akihiko Komuro
- Department of Medicine, Northwestern University, Evanston, IL 60208, USA
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Paulmann D, Magulski T, Schwarz R, Heitmann L, Flehmig B, Vallbracht A, Dotzauer A. Hepatitis A virus protein 2B suppresses beta interferon (IFN) gene transcription by interfering with IFN regulatory factor 3 activation. J Gen Virol 2008; 89:1593-1604. [PMID: 18559929 DOI: 10.1099/vir.0.83521-0] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Hepatitis A virus (HAV) antagonizes the innate immune response by inhibition of retinoic acid-inducible gene I-mediated and melanoma differentiation-associated gene 5-mediated beta interferon (IFN-beta) gene expression. This study showed that this is due to an interaction of HAV with mitochondrial antiviral signalling protein (MAVS)-dependent signalling, in which the viral non-structural protein 2B and the protein intermediate 3ABC recently suggested in this context seem to be involved, cooperatively affecting the activities of MAVS and the kinases TANK-binding kinase 1 (TBK1) and the inhibitor of NF-kappaB kinase epsilon (IKKepsilon). In consequence, interferon regulatory factor 3 (IRF-3) is not activated. As IRF-3 is necessary for IFN-beta transcription, inhibition of this factor results in efficient suppression of IFN-beta synthesis. This ability might be of vital importance for HAV, which is an exceptionally slow growing virus sensitive to IFN-beta, as it allows the virus to establish infection and maintain virus replication for a longer period of time.
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Affiliation(s)
- Dajana Paulmann
- Department of Virology, University of Bremen, Leobener Straße/UFT, D-28359 Bremen, Germany
| | - Thomas Magulski
- Department of Virology, University of Bremen, Leobener Straße/UFT, D-28359 Bremen, Germany
| | - Rebecca Schwarz
- Department of Virology, University of Bremen, Leobener Straße/UFT, D-28359 Bremen, Germany
| | - Lisa Heitmann
- Department of Virology, University of Bremen, Leobener Straße/UFT, D-28359 Bremen, Germany
| | - Bertram Flehmig
- Children's Hospital, Department 1, University of Tübingen, Silcherstraße 7, D-72076 Tübingen, Germany
| | - Angelika Vallbracht
- Department of Virology, University of Bremen, Leobener Straße/UFT, D-28359 Bremen, Germany
| | - Andreas Dotzauer
- Department of Virology, University of Bremen, Leobener Straße/UFT, D-28359 Bremen, Germany
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Porcine reproductive and respiratory syndrome virus (PRRSV) suppresses interferon-beta production by interfering with the RIG-I signaling pathway. Mol Immunol 2008; 45:2839-46. [PMID: 18336912 PMCID: PMC7112510 DOI: 10.1016/j.molimm.2008.01.028] [Citation(s) in RCA: 120] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2007] [Revised: 01/20/2008] [Accepted: 01/25/2008] [Indexed: 12/15/2022]
Abstract
Porcine reproductive and respiratory syndrome virus (PRRSV) is the cause of an economically important swine disease that has been devastating the swine industry since the late 1980s. Accumulating evidences have revealed that PRRSV infection fails to induce type I interferon (IFN-α/β), which are normally induced rapidly during virus replication in virus-infected cells. However, the potential mechanisms remain largely unclear. In this study, we showed that PRRSV infection activated the signal transduction components of NF-κB and AP-1, but not of interferon regulatory factor 3 (IRF3), an essential IFN-β transcription factor. Furthermore, PRRSV infection significantly blocked synthetic dsRNA-induced IFN-β production and IRF3 nuclear translocation. To better understand the upstream signaling events that suppress IRF3 activation, we further investigated the roles of individual components of the retinoic acid-inducible gene I (RIG-I)- and Toll-like receptor 3 (TLR3)-mediated signaling pathway for IFN-β production during PRRSV infection. We observed that PRRSV infection significantly inhibited dsRNA-induced IRF3 activation and IFN-β generation by inactivating IFN-β promoter stimulator 1 (IPS-1), an adaptor molecule of RIG-I. In contrast, PRRSV infection only partially reduced the activation of TIR domain-containing adaptor inducing IFN-β (TRIF), an adaptor molecule of TLR3. Our results suggest that PRRSV infection suppresses production of IFN-β primarily by interfering with the IPS-1 activation in the RIG-I signaling pathway.
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Randall RE, Goodbourn S. Interferons and viruses: an interplay between induction, signalling, antiviral responses and virus countermeasures. J Gen Virol 2008; 89:1-47. [PMID: 18089727 DOI: 10.1099/vir.0.83391-0] [Citation(s) in RCA: 1203] [Impact Index Per Article: 75.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The interferon (IFN) system is an extremely powerful antiviral response that is capable of controlling most, if not all, virus infections in the absence of adaptive immunity. However, viruses can still replicate and cause disease in vivo, because they have some strategy for at least partially circumventing the IFN response. We reviewed this topic in 2000 [Goodbourn, S., Didcock, L. & Randall, R. E. (2000). J Gen Virol 81, 2341-2364] but, since then, a great deal has been discovered about the molecular mechanisms of the IFN response and how different viruses circumvent it. This information is of fundamental interest, but may also have practical application in the design and manufacture of attenuated virus vaccines and the development of novel antiviral drugs. In the first part of this review, we describe how viruses activate the IFN system, how IFNs induce transcription of their target genes and the mechanism of action of IFN-induced proteins with antiviral action. In the second part, we describe how viruses circumvent the IFN response. Here, we reflect upon possible consequences for both the virus and host of the different strategies that viruses have evolved and discuss whether certain viruses have exploited the IFN response to modulate their life cycle (e.g. to establish and maintain persistent/latent infections), whether perturbation of the IFN response by persistent infections can lead to chronic disease, and the importance of the IFN system as a species barrier to virus infections. Lastly, we briefly describe applied aspects that arise from an increase in our knowledge in this area, including vaccine design and manufacture, the development of novel antiviral drugs and the use of IFN-sensitive oncolytic viruses in the treatment of cancer.
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Affiliation(s)
- Richard E Randall
- School of Biology, University of St Andrews, The North Haugh, St Andrews KY16 9ST, UK
| | - Stephen Goodbourn
- Division of Basic Medical Sciences, St George's, University of London, London SW17 0RE, UK
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Wang Y, Zhang HX, Sun YP, Liu ZX, Liu XS, Wang L, Lu SY, Kong H, Liu QL, Li XH, Lu ZY, Chen SJ, Chen Z, Bao SS, Dai W, Wang ZG. Rig-I-/- mice develop colitis associated with downregulation of G alpha i2. Cell Res 2007; 17:858-68. [PMID: 17893708 DOI: 10.1038/cr.2007.81] [Citation(s) in RCA: 97] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
RIG-I (retinoid acid-inducible gene-I), a putative RNA helicase with a cytoplasmic caspase-recruitment domain (CARD), was identified as a pattern-recognition receptor (PRR) that mediates antiviral immunity by inducing type I interferon production. To further study the biological function of RIG-I, we generated Rig-I(-/-) mice through homologous recombination, taking a different strategy to the previously reported strategy. Our Rig-I(-/-) mice are viable and fertile. Histological analysis shows that Rig-I(-/-) mice develop a colitis-like phenotype and increased susceptibility to dextran sulfate sodium-induced colitis. Accordingly, the size and number of Peyer's patches dramatically decreased in mutant mice. The peripheral T-cell subsets in mutant mice are characterized by an increase in effector T cells and a decrease in naive T cells, indicating an important role for Rig-I in the regulation of T-cell activation. It was further found that Rig-I deficiency leads to the downregulation of G protein alpha i2 subunit (G alpha i2) in various tissues, including T and B lymphocytes. By contrast, upregulation of Rig-I in NB4 cells that are treated with ATRA is accompanied by elevated G alpha i2 expression. Moreover, G alpha i2 promoter activity is increased in co-transfected NIH3T3 cells in a Rig-I dose-dependent manner. All these findings suggest that Rig-I has crucial roles in the regulation of G alpha i2 expression and T-cell activation. The development of colitis may be, at least in part, associated with downregulation of G alpha i2 and disturbed T-cell homeostasis.
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Affiliation(s)
- Yi Wang
- Department of Medical Genetics, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
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Abstract
Virus-infection of mammalian cells causes transcriptional induction of many cellular genes, collectively called as "viral stress-inducible genes." The proteins encoded by these genes are essential to maintain cell-virus homeostasis, which is required for both virus replication and host survival. Many viral products, including RNA, DNA, and proteins, can induce these genes by using distinct, but partially overlapping, signaling pathways. Type I interferons, direct products of virus infection, can also induce many of these genes, thus providing a positive feedback loop. Double-stranded RNA, a common by-product of virus replication, can induce them by multiple signaling pathways initiated by Toll-like receptor 3 or RIG-I/Mda-5. Several viral stress-inducible proteins inhibit protein synthesis. Proteins of the P56 family bind to the translation initiation factor, eIF-3, and block translation initiation. PKR, a protein kinase, phosphorylates a different initiation factor, eIF-2, and inhibits translation initiation. However, unlike P56, PKR needs to be first activated by dsRNA or PACT, another cellular protein. Another family of enzymes, the 2'-5' oligoadenylate synthetases, synthesizes 2'-5' linked oligoadenylates [2-5(A)] in the presence of dsRNA; 2-5(A) activates the latent ribonuclease, RNase L, which degrades mRNA. Many viruses have evolved mechanisms to evade these genes by blocking their induction or actions; often more than one strategy is used by the same virus to achieve this goal. Thus, in an infected cell, equilibrium is reached between the virus and the cell with regards to the viral stress-inducible genes.
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Affiliation(s)
- Ganes C Sen
- Department of Molecular Genetics, The Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA
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