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Goddard AM, Cho MG, Lerner LM, Gupta GP. Mechanisms of Immune Sensing of DNA Damage. J Mol Biol 2024; 436:168424. [PMID: 38159716 DOI: 10.1016/j.jmb.2023.168424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 12/22/2023] [Accepted: 12/26/2023] [Indexed: 01/03/2024]
Abstract
Genomic stability relies on a multifaceted and evolutionarily conserved DNA damage response (DDR). In multicellular organisms, an integral facet of the DDR involves the activation of the immune system to eliminate cells with persistent DNA damage. Recent research has shed light on a complex array of nucleic acid sensors crucial for innate immune activation in response to oncogenic stress-associated DNA damage, a process vital for suppressing tumor formation. Yet, these immune sensing pathways may also be co-opted to foster tolerance of chromosomal instability, thereby driving cancer progression. This review aims to provide an updated overview of how the innate immune system detects and responds to DNA damage. An improved understanding of the regulatory intricacies governing this immune response may uncover new avenues for cancer prevention and therapeutic intervention.
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Affiliation(s)
- Anna M Goddard
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; Department of Pathology and Laboratory Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
| | - Min-Guk Cho
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Lynn M Lerner
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; Genetics and Molecular Biology Curriculum, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Gaorav P Gupta
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; Department of Radiation Oncology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
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2
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Zhai X, Zhang T, Zhang L, Wang X, Liu N, Jiang W, Fan X, Lu X, Tian M, Wei L, Jiang S. The role of duck LGP2 in innate immune response of host anti-tembusu virus. Vet Microbiol 2023; 287:109907. [PMID: 37951010 DOI: 10.1016/j.vetmic.2023.109907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 10/26/2023] [Accepted: 10/27/2023] [Indexed: 11/13/2023]
Abstract
Laboratory of Genetics and Physiology 2 (LGP2), along with Retinoic Acid Induced Gene-I (RIG-I) and Melanoma Differentiation Associated Gene 5, are members of the retinoic acid-inducible gene-I-like receptors (RLRs) in pattern recognition receptors, playing an important role in the host's innate immunity. Due to lacking a caspase activation and recruitment domain, LGP2 is controversially regarded as a positive or negative regulator in the antiviral response. This study aimed to explore how duck LGP2 (duLGP2) participates in duck innate immunity and its role in countering the duck Tembusu virus (DTMUV). In duck embryo fibroblast cells, the overexpression of duLGP2 significantly reduced the cell's antiviral capacity by inhibiting type I interferon (IFN) production and the expression of downstream IFN-stimulated genes. Conversely, duLGP2 knockdown had the opposite effect. For the first time, we introduced the LGP2 gene fragment into duck embryos using a lentiviral vector to ensure persistent expression and generated gene-edited ducks with LGP2 overexpression. We demonstrated that duLGP2 facilitates DTMUV replication in both in vitro and in vivo experiments, leading to robust inflammatory and antiviral responses. Interestingly, the repressive effects of duLGP2 on type I IFN production were only observed in the early stage of DTMUV infection, with type I IFN responses becoming enhanced as the viral load increased. These results indicate that duLGP2 acts as a negative regulator during the resting state and early stages of DTMUV infection. This study provides a theoretical basis for further research on duck RLRs and developing new anti-DTMUV drugs or vaccine adjuvants.
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Affiliation(s)
- Xinyu Zhai
- Sino-German Cooperative Research Centre for Zoonosis of Animal Origin of Shandong Province, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, 61 Daizong Road, Tai'an City 271018, Shandong Province, China
| | - Tingting Zhang
- Sino-German Cooperative Research Centre for Zoonosis of Animal Origin of Shandong Province, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, 61 Daizong Road, Tai'an City 271018, Shandong Province, China; College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, Guangdong Province, China; School of Clinical and Basic Medical Sciences, Shandong First Medical University & Shandong Academy of Medical Sciences, Ji'nan 250024, China
| | - Lan Zhang
- Gynecology Department of Tai'an Central Hospital, Tai'an 271099, Shandong Province, China
| | - Xiuyuan Wang
- Sino-German Cooperative Research Centre for Zoonosis of Animal Origin of Shandong Province, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, 61 Daizong Road, Tai'an City 271018, Shandong Province, China
| | - Nan Liu
- Sino-German Cooperative Research Centre for Zoonosis of Animal Origin of Shandong Province, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, 61 Daizong Road, Tai'an City 271018, Shandong Province, China
| | - Wansi Jiang
- Sino-German Cooperative Research Centre for Zoonosis of Animal Origin of Shandong Province, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, 61 Daizong Road, Tai'an City 271018, Shandong Province, China
| | - Xiaole Fan
- Sino-German Cooperative Research Centre for Zoonosis of Animal Origin of Shandong Province, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, 61 Daizong Road, Tai'an City 271018, Shandong Province, China
| | - Xiaoyu Lu
- Sino-German Cooperative Research Centre for Zoonosis of Animal Origin of Shandong Province, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, 61 Daizong Road, Tai'an City 271018, Shandong Province, China
| | - Mingzhuo Tian
- Sino-German Cooperative Research Centre for Zoonosis of Animal Origin of Shandong Province, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, 61 Daizong Road, Tai'an City 271018, Shandong Province, China
| | - Liangmeng Wei
- Sino-German Cooperative Research Centre for Zoonosis of Animal Origin of Shandong Province, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, 61 Daizong Road, Tai'an City 271018, Shandong Province, China.
| | - Shijin Jiang
- Sino-German Cooperative Research Centre for Zoonosis of Animal Origin of Shandong Province, Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, 61 Daizong Road, Tai'an City 271018, Shandong Province, China.
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3
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Jiang L, Chen H, Li C. Advances in deciphering the interactions between viral proteins of influenza A virus and host cellular proteins. CELL INSIGHT 2023; 2:100079. [PMID: 37193064 PMCID: PMC10134199 DOI: 10.1016/j.cellin.2023.100079] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 01/28/2023] [Accepted: 01/28/2023] [Indexed: 05/18/2023]
Abstract
Influenza A virus (IAV) poses a severe threat to the health of animals and humans. The genome of IAV consists of eight single-stranded negative-sense RNA segments, encoding ten essential proteins as well as certain accessory proteins. In the process of virus replication, amino acid substitutions continuously accumulate, and genetic reassortment between virus strains readily occurs. Due to this high genetic variability, new viruses that threaten animal and human health can emerge at any time. Therefore, the study on IAV has always been a focus of veterinary medicine and public health. The replication, pathogenesis, and transmission of IAV involve intricate interplay between the virus and host. On one hand, the entire replication cycle of IAV relies on numerous proviral host proteins that effectively allow the virus to adapt to its host and support its replication. On the other hand, some host proteins play restricting roles at different stages of the viral replication cycle. The mechanisms of interaction between viral proteins and host cellular proteins are currently receiving particular interest in IAV research. In this review, we briefly summarize the current advances in our understanding of the mechanisms by which host proteins affect virus replication, pathogenesis, or transmission by interacting with viral proteins. Such information about the interplay between IAV and host proteins could provide insights into how IAV causes disease and spreads, and might help support the development of antiviral drugs or therapeutic approaches.
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Affiliation(s)
- Li Jiang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Hualan Chen
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Chengjun Li
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
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4
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Han M, Gao S, Hu W, Zhou Q, Li H, Lin W, Chen F. Inhibitory effects of cedar pine needle extract on H9N2 avian influenza virus in vitro and in vivo. Virology 2022; 574:25-36. [PMID: 35878455 DOI: 10.1016/j.virol.2022.07.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Revised: 07/13/2022] [Accepted: 07/14/2022] [Indexed: 11/19/2022]
Abstract
H9N2 avian influenza virus causes significant economic losses to the poultry industry, due to its wide-spread prevalence and propensity to induce secondary and mixed infections. Antigenic drift limits vaccine efficacy. New anti-viral therapies are needed to complement existing control measures. At the maximum non-cytotoxic concentration (25 mg/mL), cedar pine needle extract inhibited H9N2 avian influenza virus proliferation in vitro and in vivo. Cedar pine needle extract reduced the haemagglutinin titre, inhibited H9N2 avian influenza virus nucleocapsid protein expression, and indirectly regulate type I and II interferon expression. Interleukin-6 expression increased during the pre-infection period but decreased during the mid-to-late stages of infection. Cedar pine needle extract may inhibit the proliferation of pathogens, regulate the immune response, and reduce host tissue damage and may serve as a potential target for drug development against H9N2 avian influenza virus.
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Affiliation(s)
- Mingzheng Han
- College of Animal Science, South China Agricultural University, Guangzhou, China; Bioforte Biotechnology Co., Ltd., Shenzhen, China; Wen's Research Institute, Yunfu, Guangdong, China
| | - Shuang Gao
- College of Animal Science, South China Agricultural University, Guangzhou, China; Wen's Research Institute, Yunfu, Guangdong, China
| | - Wenfeng Hu
- College of Animal Science, South China Agricultural University, Guangzhou, China; Bioforte Biotechnology Co., Ltd., Shenzhen, China; Wen's Research Institute, Yunfu, Guangdong, China
| | | | - Hongxin Li
- College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Wencheng Lin
- College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Feng Chen
- College of Animal Science, South China Agricultural University, Guangzhou, China; Bioforte Biotechnology Co., Ltd., Shenzhen, China; Wen's Research Institute, Yunfu, Guangdong, China.
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5
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Martynova E, Rizvanov A, Urbanowicz RA, Khaiboullina S. Inflammasome Contribution to the Activation of Th1, Th2, and Th17 Immune Responses. Front Microbiol 2022; 13:851835. [PMID: 35369454 PMCID: PMC8969514 DOI: 10.3389/fmicb.2022.851835] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 02/22/2022] [Indexed: 12/24/2022] Open
Abstract
Inflammasomes are cytosolic polyprotein complexes formed in response to various external and internal stimuli, including viral and bacterial antigens. The main product of the inflammasome is active caspase 1 which proteolytically cleaves, releasing functional interleukin-1 beta (IL-1β) and interleukin-18 (IL-18). These cytokines play a central role in shaping immune response to pathogens. In this review, we will focus on the mechanisms of inflammasome activation, as well as their role in development of Th1, Th2, and Th17 lymphocytes. The contribution of cytokines IL-1β, IL-18, and IL-33, products of activated inflammasomes, are summarized. Additionally, the role of cytokines released from tissue cells in promoting differentiation of lymphocyte populations is discussed.
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Affiliation(s)
| | | | - Richard A. Urbanowicz
- Department of Infection Biology and Microbiomes, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, United Kingdom
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6
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Reduction of some viral protein's gene expression of recombinant influenza A/H1N1-PR8 virus upon treatment with Punica granatum crude extract. GENE REPORTS 2022. [DOI: 10.1016/j.genrep.2022.101524] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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7
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Wang Z, Ye S, Yao C, Wang J, Mao J, Xu L, Liu Y, Fu C, Lu G, Li S. Antiviral Activity of Canine RIG-I against Canine Influenza Virus and Interactions between Canine RIG-I and CIV. Viruses 2021; 13:v13102048. [PMID: 34696478 PMCID: PMC8540569 DOI: 10.3390/v13102048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 10/07/2021] [Accepted: 10/08/2021] [Indexed: 12/24/2022] Open
Abstract
RIG-I functions as a virus sensor that induces a cellular antiviral response. Although it has been investigated in other species, there have been no further studies to date on canine RIG-I against canine influenza virus (CIV). In the present study, we cloned the RIG-I gene of beagle dogs and characterized its expression, subcellular localization, antiviral response, and interactions with CIV proteins. RIG-I was highly expressed and mainly localized in the cytoplasm, with low levels detected in the nucleus. The results revealed that overexpression of the CARD domain of RIG-I and knockdown of RIG-I showed its ability to activate the RLR pathway and induced the expression of downstream interferon-stimulated genes. Moreover, overexpression of canine RIG-I suppressed the replication of CIV. The association between RIG-I and CIV was evaluated with the luciferase assay and by indirect immunofluorescence and bimolecular fluorescence complementation analyses. The results showed that CIV nonstructural protein 1 (NS1) can strongly suppress the RIG-I–mediated innate immune response, and the novel interactions between CIV matrix proteins (M1 and M2) and canine RIG-I were disclosed. These findings provide a basis for investigating the antiviral mechanism of canine RIG-I against CIV, which can lead to effective strategies for preventing CIV infection in dogs.
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Affiliation(s)
- Zhen Wang
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (Z.W.); (S.Y.); (C.Y.); (J.W.); (J.M.); (L.X.); (Y.L.); (G.L.)
- Guangdong Provincial Key Laboratory of Prevention and Control for Severe Clinical Animal Diseases, Guangzhou 510642, China
- Guangdong Technological Engineering Research Center for Pet, South China Agricultural University, Guangzhou 510642, China
| | - Shaotang Ye
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (Z.W.); (S.Y.); (C.Y.); (J.W.); (J.M.); (L.X.); (Y.L.); (G.L.)
- Guangdong Provincial Key Laboratory of Prevention and Control for Severe Clinical Animal Diseases, Guangzhou 510642, China
- Guangdong Technological Engineering Research Center for Pet, South China Agricultural University, Guangzhou 510642, China
| | - Congwen Yao
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (Z.W.); (S.Y.); (C.Y.); (J.W.); (J.M.); (L.X.); (Y.L.); (G.L.)
- Guangdong Provincial Key Laboratory of Prevention and Control for Severe Clinical Animal Diseases, Guangzhou 510642, China
- Guangdong Technological Engineering Research Center for Pet, South China Agricultural University, Guangzhou 510642, China
| | - Ji Wang
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (Z.W.); (S.Y.); (C.Y.); (J.W.); (J.M.); (L.X.); (Y.L.); (G.L.)
- Guangdong Provincial Key Laboratory of Prevention and Control for Severe Clinical Animal Diseases, Guangzhou 510642, China
- Guangdong Technological Engineering Research Center for Pet, South China Agricultural University, Guangzhou 510642, China
| | - Jianwei Mao
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (Z.W.); (S.Y.); (C.Y.); (J.W.); (J.M.); (L.X.); (Y.L.); (G.L.)
- Guangdong Provincial Key Laboratory of Prevention and Control for Severe Clinical Animal Diseases, Guangzhou 510642, China
- Guangdong Technological Engineering Research Center for Pet, South China Agricultural University, Guangzhou 510642, China
| | - Liang Xu
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (Z.W.); (S.Y.); (C.Y.); (J.W.); (J.M.); (L.X.); (Y.L.); (G.L.)
- Guangdong Provincial Key Laboratory of Prevention and Control for Severe Clinical Animal Diseases, Guangzhou 510642, China
- Guangdong Technological Engineering Research Center for Pet, South China Agricultural University, Guangzhou 510642, China
| | - Yongbo Liu
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (Z.W.); (S.Y.); (C.Y.); (J.W.); (J.M.); (L.X.); (Y.L.); (G.L.)
- Guangdong Provincial Key Laboratory of Prevention and Control for Severe Clinical Animal Diseases, Guangzhou 510642, China
- Guangdong Technological Engineering Research Center for Pet, South China Agricultural University, Guangzhou 510642, China
| | - Cheng Fu
- College of Animal Science & Technology, Zhongkai University of Agriculture and Engineering, Guangzhou 510642, China;
| | - Gang Lu
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (Z.W.); (S.Y.); (C.Y.); (J.W.); (J.M.); (L.X.); (Y.L.); (G.L.)
- Guangdong Provincial Key Laboratory of Prevention and Control for Severe Clinical Animal Diseases, Guangzhou 510642, China
- Guangdong Technological Engineering Research Center for Pet, South China Agricultural University, Guangzhou 510642, China
| | - Shoujun Li
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (Z.W.); (S.Y.); (C.Y.); (J.W.); (J.M.); (L.X.); (Y.L.); (G.L.)
- Guangdong Provincial Key Laboratory of Prevention and Control for Severe Clinical Animal Diseases, Guangzhou 510642, China
- Guangdong Technological Engineering Research Center for Pet, South China Agricultural University, Guangzhou 510642, China
- Correspondence:
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Thoresen D, Wang W, Galls D, Guo R, Xu L, Pyle AM. The molecular mechanism of RIG-I activation and signaling. Immunol Rev 2021; 304:154-168. [PMID: 34514601 PMCID: PMC9293153 DOI: 10.1111/imr.13022] [Citation(s) in RCA: 93] [Impact Index Per Article: 31.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2021] [Revised: 08/10/2021] [Accepted: 08/17/2021] [Indexed: 12/25/2022]
Abstract
RIG‐I is our first line of defense against RNA viruses, serving as a pattern recognition receptor that identifies molecular features common among dsRNA and ssRNA viral pathogens. RIG‐I is maintained in an inactive conformation as it samples the cellular space for pathogenic RNAs. Upon encounter with the triphosphorylated terminus of blunt‐ended viral RNA duplexes, the receptor changes conformation and releases a pair of signaling domains (CARDs) that are selectively modified and interact with an adapter protein (MAVS), thereby triggering a signaling cascade that stimulates transcription of interferons. Here, we describe the structural determinants for specific RIG‐I activation by viral RNA, and we describe the strategies by which RIG‐I remains inactivated in the presence of host RNAs. From the initial RNA triggering event to the final stages of interferon expression, we describe the experimental evidence underpinning our working knowledge of RIG‐I signaling. We draw parallels with behavior of related proteins MDA5 and LGP2, describing evolutionary implications of their collective surveillance of the cell. We conclude by describing the cell biology and immunological investigations that will be needed to accurately describe the role of RIG‐I in innate immunity and to provide the necessary foundation for pharmacological manipulation of this important receptor.
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Affiliation(s)
- Daniel Thoresen
- Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT, USA
| | - Wenshuai Wang
- Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT, USA
| | - Drew Galls
- Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT, USA
| | - Rong Guo
- Chemistry, Yale University, New Haven, CT, USA
| | - Ling Xu
- Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT, USA
| | - Anna Marie Pyle
- Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT, USA.,Chemistry, Yale University, New Haven, CT, USA.,Howard Hughes Medical Institute, Yale University, New Haven, CT, USA
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9
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Interferon Inducer IFI35 regulates RIG-I-mediated innate antiviral response through mutual antagonism with Influenza protein NS1. J Virol 2021; 95:JVI.00283-21. [PMID: 33692214 PMCID: PMC8139692 DOI: 10.1128/jvi.00283-21] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Interferon-stimulated genes (ISGs) create multiple lines of defense against viral infection. Here we show that interferon induced protein 35 (IFI35) inhibits swine (H3N2) influenza virus replication by directly interacting with the viral protein NS1. IFI35 binds more preferentially to the effector domain of NS1 (128-207aa) than to the viral RNA sensor RIG-I. This promotes mutual antagonism between IFI35 and NS1, and frees RIG-I from IFI35-mediated K48-linked ubiquitination and degradation. However, IFI35 does not interact with the NS1 encoded by avian (H7N9) influenza virus, resulting in IFI35 playing an opposite virus enabling role during highly pathogenic H7N9 virus infection. Notably, replacing the 128-207aa region of NS1-H7N9 with the corresponding region of NS1-H3N2 results in the chimeric NS1 acquiring the ability to bind to and mutually antagonize IFI35. IFI35 deficient mice accordingly exhibit more resistance to lethal H7N9 infection than their wild-type control exhibit. Our data uncover a novel mechanism by which IFI35 regulates RIG-I-mediated anti-viral immunity through mutual antagonism with influenza protein NS1.IMPORTANCEIAV infection poses a global health threat, and is among the most common contagious pathogens to cause severe respiratory infections in humans and animals. ISGs play a key role in host defense against IAV infection. In line with others, we show IFI35-mediated ubiquitination of RIG-I to be involved in innate immunity. Moreover, we define a novel role of IFI35 in regulating the type I IFN pathway during IAV infection. We found that IFI35 regulates RIG-I mediated antiviral signaling by interacting with IAV-NS1. H3N2 NS1, but notably not H7N9 NS1, interacts with IFI35 and efficiently suppresses IFI35-dependent ubiquitination of RIG-I. IFI35 deficiency protected mice from H7N9 virus infection. Therefore, manipulation of the IFI35-NS1 provides a new approach for the development of anti-IAV treatments.
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10
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The influenza virus RNA polymerase as an innate immune agonist and antagonist. Cell Mol Life Sci 2021; 78:7237-7256. [PMID: 34677644 PMCID: PMC8532088 DOI: 10.1007/s00018-021-03957-w] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 08/16/2021] [Accepted: 09/29/2021] [Indexed: 12/16/2022]
Abstract
Influenza A viruses cause a mild-to-severe respiratory disease that affects millions of people each year. One of the many determinants of disease outcome is the innate immune response to the viral infection. While antiviral responses are essential for viral clearance, excessive innate immune activation promotes lung damage and disease. The influenza A virus RNA polymerase is one of viral proteins that affect innate immune activation during infection, but the mechanisms behind this activity are not well understood. In this review, we discuss how the viral RNA polymerase can both activate and suppress innate immune responses by either producing immunostimulatory RNA species or directly targeting the components of the innate immune signalling pathway, respectively. Furthermore, we provide a comprehensive overview of the polymerase residues, and their mutations, associated with changes in innate immune activation, and discuss their putative effects on polymerase function based on recent advances in our understanding of the influenza A virus RNA polymerase structure.
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11
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Li C, Wang T, Zhang Y, Wei F. Evasion mechanisms of the type I interferons responses by influenza A virus. Crit Rev Microbiol 2020; 46:420-432. [PMID: 32715811 DOI: 10.1080/1040841x.2020.1794791] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
The type I interferons (IFNs) represent the first line of host defense against influenza virus infection, and the precisely control of the type I IFNs responses is a central event of the immune defense against influenza viral infection. Influenza viruses are one of the leading causes of respiratory tract infections in human and are responsible for seasonal epidemics and occasional pandemics, leading to a serious threat to global human health due to their antigenic variation and interspecies transmission. Although the host cells have evolved sophisticated antiviral mechanisms based on sensing influenza viral products and triggering of signalling cascades resulting in secretion of the type I IFNs (IFN-α/β), influenza viruses have developed many strategies to counteract this mechanism and circumvent the type I IFNs responses, for example, by inducing host shut-off, or by regulating the polyubiquitination of viral and host proteins. This review will summarise the current knowledge of how the host cells recognise influenza viruses to induce the type I IFNs responses and the strategies that influenza viruses exploited to evade the type I IFNs signalling pathways, which will be helpful for the development of antivirals and vaccines.
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Affiliation(s)
- Chengye Li
- Key Laboratory of Ministry of Education for Conservation and Utilization of Special Biological Resources in Western China, Ningxia University, Yinchuan, China.,College of Agriculture, Ningxia University, Yinchuan, China
| | - Tong Wang
- Key Laboratory of Animal Epidemiology and Zoonosis, Ministry of Agriculture, College of Veterinary Medicine and State Key Laboratory of Agrobiotechnology, China Agricultural University, Beijing, China
| | - Yuying Zhang
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Fanhua Wei
- College of Agriculture, Ningxia University, Yinchuan, China
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12
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Rehwinkel J, Gack MU. RIG-I-like receptors: their regulation and roles in RNA sensing. Nat Rev Immunol 2020; 20:537-551. [PMID: 32203325 PMCID: PMC7094958 DOI: 10.1038/s41577-020-0288-3] [Citation(s) in RCA: 795] [Impact Index Per Article: 198.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/04/2020] [Indexed: 02/06/2023]
Abstract
Retinoic acid-inducible gene I (RIG-I)-like receptors (RLRs) are key sensors of virus infection, mediating the transcriptional induction of type I interferons and other genes that collectively establish an antiviral host response. Recent studies have revealed that both viral and host-derived RNAs can trigger RLR activation; this can lead to an effective antiviral response but also immunopathology if RLR activities are uncontrolled. In this Review, we discuss recent advances in our understanding of the types of RNA sensed by RLRs in the contexts of viral infection, malignancies and autoimmune diseases. We further describe how the activity of RLRs is controlled by host regulatory mechanisms, including RLR-interacting proteins, post-translational modifications and non-coding RNAs. Finally, we discuss key outstanding questions in the RLR field, including how our knowledge of RLR biology could be translated into new therapeutics. The RNA-sensing retinoic acid-inducible gene I (RIG-I)-like receptors (RLRs) are important inducers of type I interferons and other antiviral immune mediators. Here, Jan Rehwinkel and Michaela Gack explain how members of the RLR family are regulated and reflect on the importance of the RLRs in viral infection, autoimmunity and cancer.
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Affiliation(s)
- Jan Rehwinkel
- Medical Research Council Human Immunology Unit, Medical Research Council Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK.
| | - Michaela U Gack
- Department of Microbiology, The University of Chicago, Chicago, IL, USA.
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Guo S, Bao L, Li C, Sun J, Zhao R, Cui X. Antiviral activity of iridoid glycosides extracted from Fructus Gardeniae against influenza A virus by PACT-dependent suppression of viral RNA replication. Sci Rep 2020; 10:1897. [PMID: 32024921 PMCID: PMC7002373 DOI: 10.1038/s41598-020-58443-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 01/15/2020] [Indexed: 11/08/2022] Open
Abstract
Epidemic and pandemic influenza A virus (IAV) poses a significant threat to human populations worldwide. Iridoid glycosides are principal bioactive components from the Gardenia jasminoides J. Ellis fruit that exhibit antiviral activity against several strains of IAV. In the present study, we evaluated the protective effect of Fructus Gardeniae iridoid glycoside extracts (IGEs) against IAV by cytopathogenic effect(CPE), MTT and a plaque formation assay in vitro and examined the reduction in the pulmonary index (PI), restoration of body weight, reduction in mortality and increases in survival time in vivo. As a host factor, PACT provides protection against the pathogenic influenza A virus by interacting with IAV polymerase and activating the IFN-I response. To verify the whether IGEs suppress IAV replication in a PACT-dependent manner, IAV RNA replication, expression of PACT and the phosphorylation of eIF2α in A549 cells were detected; the levels of IFNβ, PACT and PKR in mouse lung tissues were determined; and the activity of IAV polymerase was evaluated in PACT-compromised cells. The results indicated that IGEs sufficiently alleviated cell damage and suppressed IAV replication in vitro, protecting mice from IAV-induced injury and lethal IAV infection. These anti-IAV effects might be related to disrupted interplay between IVA polymerase and PACT and/or prevention of a PACT-dependent overactivated IFN-I antiviral response. Taken together, our findings reveal a new facet of the mechanisms by which IGEs fight the influenza A virus in a PACT-dependent manner.
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Affiliation(s)
- Shanshan Guo
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, No.4 Yinghua East Road, Chaoyang District, Beijing, 100029, China
| | - Lei Bao
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, No.4 Yinghua East Road, Chaoyang District, Beijing, 100029, China
| | - Chun Li
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, No.4 Yinghua East Road, Chaoyang District, Beijing, 100029, China
| | - Jing Sun
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, No.4 Yinghua East Road, Chaoyang District, Beijing, 100029, China
| | - Ronghua Zhao
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, No.4 Yinghua East Road, Chaoyang District, Beijing, 100029, China
| | - Xiaolan Cui
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, No.4 Yinghua East Road, Chaoyang District, Beijing, 100029, China.
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14
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Brisse M, Ly H. Comparative Structure and Function Analysis of the RIG-I-Like Receptors: RIG-I and MDA5. Front Immunol 2019; 10:1586. [PMID: 31379819 PMCID: PMC6652118 DOI: 10.3389/fimmu.2019.01586] [Citation(s) in RCA: 218] [Impact Index Per Article: 43.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Accepted: 06/25/2019] [Indexed: 12/12/2022] Open
Abstract
RIG-I (Retinoic acid-inducible gene I) and MDA5 (Melanoma Differentiation-Associated protein 5), collectively known as the RIG-I-like receptors (RLRs), are key protein sensors of the pathogen-associated molecular patterns (PAMPs) in the form of viral double-stranded RNA (dsRNA) motifs to induce expression of type 1 interferons (IFN1) (IFNα and IFNβ) and other pro-inflammatory cytokines during the early stage of viral infection. While RIG-I and MDA5 share many genetic, structural and functional similarities, there is increasing evidence that they can have significantly different strategies to recognize different pathogens, PAMPs, and in different host species. This review article discusses the similarities and differences between RIG-I and MDA5 from multiple perspectives, including their structures, evolution and functional relationships with other cellular proteins, their differential mechanisms of distinguishing between host and viral dsRNAs and interactions with host and viral protein factors, and their immunogenic signaling. A comprehensive comparative analysis can help inform future studies of RIG-I and MDA5 in order to fully understand their functions in order to optimize potential therapeutic approaches targeting them.
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Affiliation(s)
- Morgan Brisse
- Biochemistry, Molecular Biology, and Biophysics Graduate Program, University of Minnesota, Twin Cities, St. Paul, MN, United States
- Department of Veterinary & Biomedical Sciences, University of Minnesota, Twin Cities, St. Paul, MN, United States
| | - Hinh Ly
- Department of Veterinary & Biomedical Sciences, University of Minnesota, Twin Cities, St. Paul, MN, United States
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15
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Liu G, Zhou Y. Cytoplasm and Beyond: Dynamic Innate Immune Sensing of Influenza A Virus by RIG-I. J Virol 2019; 93:e02299-18. [PMID: 30760567 PMCID: PMC6450113 DOI: 10.1128/jvi.02299-18] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Accepted: 02/05/2019] [Indexed: 12/24/2022] Open
Abstract
Innate immune sensing of influenza A virus (IAV) requires retinoic acid-inducible gene I (RIG-I), a fundamental cytoplasmic RNA sensor. How RIG-I's cytoplasmic localization reconciles with the nuclear replication nature of IAV is poorly understood. Recent findings provide advanced insights into the spatiotemporal RIG-I sensing of IAV and highlight the contribution of various RNA ligands to RIG-I activation. Understanding a compartment-specific RIG-I-sensing paradigm would facilitate the identification of the full spectrum of physiological RIG-I ligands produced during IAV infection.
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Affiliation(s)
- GuanQun Liu
- Vaccine and Infectious Disease Organization-International Vaccine Centre (VIDO-InterVac), University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Yan Zhou
- Vaccine and Infectious Disease Organization-International Vaccine Centre (VIDO-InterVac), University of Saskatchewan, Saskatoon, Saskatchewan, Canada
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Liu G, Lu Y, Thulasi Raman SN, Xu F, Wu Q, Li Z, Brownlie R, Liu Q, Zhou Y. Nuclear-resident RIG-I senses viral replication inducing antiviral immunity. Nat Commun 2018; 9:3199. [PMID: 30097581 PMCID: PMC6086882 DOI: 10.1038/s41467-018-05745-w] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Accepted: 07/24/2018] [Indexed: 12/28/2022] Open
Abstract
The nucleus represents a cellular compartment where the discrimination of self from non-self nucleic acids is vital. While emerging evidence establishes a nuclear non-self DNA sensing paradigm, the nuclear sensing of non-self RNA, such as that from nuclear-replicating RNA viruses, remains unexplored. Here, we report the identification of nuclear-resident RIG-I actively involved in nuclear viral RNA sensing. The nuclear RIG-I, along with its cytoplasmic counterpart, senses influenza A virus (IAV) nuclear replication leading to a cooperative induction of type I interferon response. Its activation signals through the canonical signaling axis and establishes an effective antiviral state restricting IAV replication. The exclusive signaling specificity conferred by nuclear RIG-I is reinforced by its inability to sense cytoplasmic-replicating Sendai virus and appreciable sensing of hepatitis B virus pregenomic RNA in the nucleus. These results refine the RNA sensing paradigm for nuclear-replicating viruses and reveal a previously unrecognized subcellular milieu for RIG-I-like receptor sensing.
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Affiliation(s)
- GuanQun Liu
- Vaccine and Infectious Disease Organization-International Vaccine Centre (VIDO-InterVac), University of Saskatchewan, Saskatoon, SK, S7N 5E3, Canada
- Vaccinology & Immunotherapeutics Program, School of Public Health, University of Saskatchewan, Saskatoon, SK, S7N 5E3, Canada
| | - Yao Lu
- Vaccine and Infectious Disease Organization-International Vaccine Centre (VIDO-InterVac), University of Saskatchewan, Saskatoon, SK, S7N 5E3, Canada
- Department of Veterinary Microbiology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, S7N 5E3, Canada
| | - Sathya N Thulasi Raman
- Vaccine and Infectious Disease Organization-International Vaccine Centre (VIDO-InterVac), University of Saskatchewan, Saskatoon, SK, S7N 5E3, Canada
| | - Fang Xu
- Vaccine and Infectious Disease Organization-International Vaccine Centre (VIDO-InterVac), University of Saskatchewan, Saskatoon, SK, S7N 5E3, Canada
| | - Qi Wu
- Vaccine and Infectious Disease Organization-International Vaccine Centre (VIDO-InterVac), University of Saskatchewan, Saskatoon, SK, S7N 5E3, Canada
- Department of Veterinary Microbiology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, S7N 5E3, Canada
| | - Zhubing Li
- Vaccine and Infectious Disease Organization-International Vaccine Centre (VIDO-InterVac), University of Saskatchewan, Saskatoon, SK, S7N 5E3, Canada
- Vaccinology & Immunotherapeutics Program, School of Public Health, University of Saskatchewan, Saskatoon, SK, S7N 5E3, Canada
| | - Robert Brownlie
- Vaccine and Infectious Disease Organization-International Vaccine Centre (VIDO-InterVac), University of Saskatchewan, Saskatoon, SK, S7N 5E3, Canada
| | - Qiang Liu
- Vaccine and Infectious Disease Organization-International Vaccine Centre (VIDO-InterVac), University of Saskatchewan, Saskatoon, SK, S7N 5E3, Canada
- Vaccinology & Immunotherapeutics Program, School of Public Health, University of Saskatchewan, Saskatoon, SK, S7N 5E3, Canada
- Department of Veterinary Microbiology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, S7N 5E3, Canada
| | - Yan Zhou
- Vaccine and Infectious Disease Organization-International Vaccine Centre (VIDO-InterVac), University of Saskatchewan, Saskatoon, SK, S7N 5E3, Canada.
- Vaccinology & Immunotherapeutics Program, School of Public Health, University of Saskatchewan, Saskatoon, SK, S7N 5E3, Canada.
- Department of Veterinary Microbiology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, S7N 5E3, Canada.
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Núñez RD, Budt M, Saenger S, Paki K, Arnold U, Sadewasser A, Wolff T. The RNA Helicase DDX6 Associates with RIG-I to Augment Induction of Antiviral Signaling. Int J Mol Sci 2018; 19:E1877. [PMID: 29949917 PMCID: PMC6073104 DOI: 10.3390/ijms19071877] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 04/13/2018] [Accepted: 06/22/2018] [Indexed: 12/25/2022] Open
Abstract
Virus infections induce sensitive antiviral responses within the host cell. The RNA helicase retinoic acid-inducible gene I (RIG-I) is a key sensor of influenza virus RNA that induces the expression of antiviral type I interferons. Recent evidence suggests a complex pattern of RIG-I regulation involving multiple interactions and cellular sites. In an approach employing affinity purification and quantitative mass spectrometry, we identified proteins with increased binding to RIG-I in response to influenza B virus infection. Among them was the RIG-I related RNA helicase DEAD box helicase 6 (DDX6), a known component of cytoplasmic mRNA-ribonucleoprotein (mRNP) granules like P-bodies and stress granules (SGs). RIG-I and DDX6 both localized to the cytosol and were detected in virus-induced SGs. Coimmunoprecipitation assays detected a basal level of complexes harboring RIG-I and DDX6 that increased after infection. Functionally, DDX6 augmented RIG-I mediated induction of interferon (IFN)-β expression. Notably, DDX6 was found to bind viral RNA capable to stimulate RIG-I. These findings imply a novel function for DDX6 as an RNA co-sensor and signaling enhancer for RIG-I.
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Affiliation(s)
- Rocío Daviña Núñez
- Robert Koch-Institut, FG17-Division of Influenza Viruses and other Respiratory Viruses, 13353 Berlin, Germany.
| | - Matthias Budt
- Robert Koch-Institut, FG17-Division of Influenza Viruses and other Respiratory Viruses, 13353 Berlin, Germany.
| | - Sandra Saenger
- Robert Koch-Institut, FG17-Division of Influenza Viruses and other Respiratory Viruses, 13353 Berlin, Germany.
| | - Katharina Paki
- Robert Koch-Institut, FG17-Division of Influenza Viruses and other Respiratory Viruses, 13353 Berlin, Germany.
| | - Ulrike Arnold
- Robert Koch-Institut, FG17-Division of Influenza Viruses and other Respiratory Viruses, 13353 Berlin, Germany.
| | - Anne Sadewasser
- Robert Koch-Institut, FG17-Division of Influenza Viruses and other Respiratory Viruses, 13353 Berlin, Germany.
| | - Thorsten Wolff
- Robert Koch-Institut, FG17-Division of Influenza Viruses and other Respiratory Viruses, 13353 Berlin, Germany.
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18
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Xia C, Wolf JJ, Vijayan M, Studstill CJ, Ma W, Hahm B. Casein Kinase 1α Mediates the Degradation of Receptors for Type I and Type II Interferons Caused by Hemagglutinin of Influenza A Virus. J Virol 2018; 92:e00006-18. [PMID: 29343571 PMCID: PMC5972889 DOI: 10.1128/jvi.00006-18] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 01/08/2018] [Indexed: 01/24/2023] Open
Abstract
Although influenza A virus (IAV) evades cellular defense systems to effectively propagate in the host, the viral immune-evasive mechanisms are incompletely understood. Our recent data showed that hemagglutinin (HA) of IAV induces degradation of type I IFN receptor 1 (IFNAR1). Here, we demonstrate that IAV HA induces degradation of type II IFN (IFN-γ) receptor 1 (IFNGR1), as well as IFNAR1, via casein kinase 1α (CK1α), resulting in the impairment of cellular responsiveness to both type I and II IFNs. IAV infection or transient HA expression induced degradation of both IFNGR1 and IFNAR1, whereas HA gene-deficient IAV failed to downregulate the receptors. IAV HA caused the phosphorylation and ubiquitination of IFNGR1, leading to the lysosome-dependent degradation of IFNGR1. Influenza viral HA strongly decreased cellular sensitivity to type II IFNs, as it suppressed the activation of STAT1 and the induction of IFN-γ-stimulated genes in response to exogenously supplied recombinant IFN-γ. Importantly, CK1α, but not p38 MAP kinase or protein kinase D2, was proven to be critical for HA-induced degradation of both IFNGR1 and IFNAR1. Pharmacologic inhibition of CK1α or small interfering RNA (siRNA)-based knockdown of CK1α repressed the degradation processes of both IFNGR1 and IFNAR1 triggered by IAV infection. Further, CK1α was shown to be pivotal for proficient replication of IAV. Collectively, the results suggest that IAV HA induces degradation of IFN receptors via CK1α, creating conditions favorable for viral propagation. Therefore, the study uncovers a new immune-evasive pathway of influenza virus.IMPORTANCE Influenza A virus (IAV) remains a grave threat to humans, causing seasonal and pandemic influenza. Upon infection, innate and adaptive immunity, such as the interferon (IFN) response, is induced to protect hosts against IAV infection. However, IAV seems to be equipped with tactics to evade the IFN-mediated antiviral responses, although the detailed mechanisms need to be elucidated. In the present study, we show that IAV HA induces the degradation of the type II IFN receptor IFNGR1 and thereby substantially attenuates cellular responses to IFN-γ. Of note, a cellular kinase, casein kinase 1α (CK1α), is crucial for IAV HA-induced degradation of both IFNGR1 and IFNAR1. Accordingly, CK1α is proven to positively regulate IAV propagation. Thus, this study unveils a novel strategy employed by IAV to evade IFN-mediated antiviral activities. These findings may provide new insights into the interplay between IAV and host immunity to impact influenza virus pathogenicity.
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MESH Headings
- A549 Cells
- Animals
- Casein Kinase I/genetics
- Casein Kinase I/immunology
- Chlorocebus aethiops
- Dogs
- HEK293 Cells
- Hemagglutinin Glycoproteins, Influenza Virus/genetics
- Hemagglutinin Glycoproteins, Influenza Virus/immunology
- Humans
- Immune Evasion
- Influenza A Virus, H1N1 Subtype/genetics
- Influenza A Virus, H1N1 Subtype/immunology
- Influenza, Human/genetics
- Influenza, Human/immunology
- Influenza, Human/pathology
- Madin Darby Canine Kidney Cells
- Protein Kinase D2
- Protein Kinases/genetics
- Protein Kinases/immunology
- Proteolysis
- Receptor, Interferon alpha-beta/genetics
- Receptor, Interferon alpha-beta/immunology
- Receptors, Interferon/genetics
- Receptors, Interferon/immunology
- STAT1 Transcription Factor/genetics
- STAT1 Transcription Factor/immunology
- Vero Cells
- p38 Mitogen-Activated Protein Kinases/genetics
- p38 Mitogen-Activated Protein Kinases/immunology
- Interferon gamma Receptor
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Affiliation(s)
- Chuan Xia
- Department of Surgery, University of Missouri, Columbia, Missouri, USA
- Department of Molecular Microbiology and Immunology, University of Missouri, Columbia, Missouri, USA
| | - Jennifer J Wolf
- Department of Surgery, University of Missouri, Columbia, Missouri, USA
- Department of Molecular Microbiology and Immunology, University of Missouri, Columbia, Missouri, USA
| | - Madhuvanthi Vijayan
- Department of Surgery, University of Missouri, Columbia, Missouri, USA
- Department of Molecular Microbiology and Immunology, University of Missouri, Columbia, Missouri, USA
| | - Caleb J Studstill
- Department of Surgery, University of Missouri, Columbia, Missouri, USA
- Department of Molecular Microbiology and Immunology, University of Missouri, Columbia, Missouri, USA
| | - Wenjun Ma
- Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas, USA
| | - Bumsuk Hahm
- Department of Surgery, University of Missouri, Columbia, Missouri, USA
- Department of Molecular Microbiology and Immunology, University of Missouri, Columbia, Missouri, USA
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Specific Mutations in the PB2 Protein of Influenza A Virus Compensate for the Lack of Efficient Interferon Antagonism of the NS1 Protein of Bat Influenza A-Like Viruses. J Virol 2018; 92:JVI.02021-17. [PMID: 29321309 DOI: 10.1128/jvi.02021-17] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Accepted: 01/03/2018] [Indexed: 02/01/2023] Open
Abstract
Recently, two new influenza A-like viruses have been discovered in bats, A/little yellow-shouldered bat/Guatemala/060/2010 (HL17NL10) and A/flat-faced bat/Peru/033/2010 (HL18NL11). The hemagglutinin (HA)-like (HL) and neuraminidase (NA)-like (NL) proteins of these viruses lack hemagglutination and neuraminidase activities, despite their sequence and structural homologies with the HA and NA proteins of conventional influenza A viruses. We have now investigated whether the NS1 proteins of the HL17NL10 and HL18NL11 viruses can functionally replace the NS1 protein of a conventional influenza A virus. For this purpose, we generated recombinant influenza A/Puerto Rico/8/1934 (PR8) H1N1 viruses containing the NS1 protein of the PR8 wild-type, HL17NL10, and HL18NL11 viruses. These viruses (r/NS1PR8, r/NS1HL17, and r/NS1HL18, respectively) were tested for replication in bat and nonbat mammalian cells and in mice. Our results demonstrate that the r/NS1HL17 and r/NS1HL18 viruses are attenuated in vitro and in vivo However, the bat NS1 recombinant viruses showed a phenotype similar to that of the r/NS1PR8 virus in STAT1-/- human A549 cells and mice, both in vitro and in vivo systems being unable to respond to interferon (IFN). Interestingly, multiple mouse passages of the r/NS1HL17 and r/NS1HL18 viruses resulted in selection of mutant viruses containing single amino acid mutations in the viral PB2 protein. In contrast to the parental viruses, virulence and IFN antagonism were restored in the selected PB2 mutants. Our results indicate that the NS1 protein of bat influenza A-like viruses is less efficient than the NS1 protein of its conventional influenza A virus NS1 counterpart in antagonizing the IFN response and that this deficiency can be overcome by the influenza virus PB2 protein.IMPORTANCE Significant gaps in our understanding of the basic features of the recently discovered bat influenza A-like viruses HL17NL10 and HL18NL11 remain. The basic biology of these unique viruses displays both similarities to and differences from the basic biology of conventional influenza A viruses. Here, we show that recombinant influenza A viruses containing the NS1 protein from HL17NL10 and HL18NL11 are attenuated. This attenuation was mediated by their inability to antagonize the type I IFN response. However, this deficiency could be compensated for by single amino acid replacements in the PB2 gene. Our results unravel a functional divergence between the NS1 proteins of bat influenza A-like and conventional influenza A viruses and demonstrate an interplay between the viral PB2 and NS1 proteins to antagonize IFN.
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Chan CP, Yuen CK, Cheung PHH, Fung SY, Lui PY, Chen H, Kok KH, Jin DY. Antiviral activity of double-stranded RNA-binding protein PACT against influenza A virus mediated via suppression of viral RNA polymerase. FASEB J 2018. [PMID: 29513570 DOI: 10.1096/fj.201701361r] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
PACT is a double-stranded RNA-binding protein that has been implicated in host-influenza A virus (IAV) interaction. PACT facilitates the action of RIG-I in the activation of the type I IFN response, which is suppressed by the viral nonstructural protein NS1. PACT is also known to interact with the IAV RNA polymerase subunit PA. Exactly how PACT exerts its antiviral activity during IAV infection remains to be elucidated. In the current study, we demonstrated the interplay between PACT and IAV polymerase. Induction of IFN-β by the IAV RNP complex was most robust when both RIG-I and PACT were expressed. PACT-dependent activation of IFN-β production was suppressed by the IAV polymerase subunits, polymerase acidic protein, polymerase basic protein 1 (PB1), and PB2. PACT associated with PA, PB1, and PB2. Compromising PACT in IAV-infected A549 cells resulted in the augmentation of viral RNA (vRNA) transcription and replication and IFN-β production. Furthermore, vRNA replication was boosted by knockdown of PACT in both A549 cells and IFN-deficient Vero cells. Thus, the antiviral activity of PACT is mediated primarily via its interaction with and inhibition of IAV polymerase. Taken together, our findings reveal a new facet of the host-IAV interaction in which the interplay between PACT and IAV polymerase affects the outcome of viral infection and antiviral response.-Chan, C.-P., Yuen, C.-K., Cheung, P.-H. H., Fung, S.-Y., Lui, P.-Y., Chen, H., Kok, K.-H., Jin, D.-Y. Antiviral activity of double-stranded RNA-binding protein PACT against influenza A virus mediated via suppression of viral RNA polymerase.
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Affiliation(s)
- Chi-Ping Chan
- School of Biomedical Sciences, The University of Hong Kong, Pokfulam, Hong Kong
| | - Chun-Kit Yuen
- Department of Microbiology, The University of Hong Kong, Pokfulam, Hong Kong
| | | | - Sin-Yee Fung
- School of Biomedical Sciences, The University of Hong Kong, Pokfulam, Hong Kong
| | - Pak-Yin Lui
- School of Biomedical Sciences, The University of Hong Kong, Pokfulam, Hong Kong
| | - Honglin Chen
- Department of Microbiology, The University of Hong Kong, Pokfulam, Hong Kong
| | - Kin-Hang Kok
- Department of Microbiology, The University of Hong Kong, Pokfulam, Hong Kong
| | - Dong-Yan Jin
- School of Biomedical Sciences, The University of Hong Kong, Pokfulam, Hong Kong
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21
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Huan CC, Wang HX, Sheng XX, Wang R, Wang X, Liao Y, Liu QF, Tong GZ, Ding C, Fan HJ, Wu JQ, Mao X. Porcine epidemic diarrhea virus nucleoprotein contributes to HMGB1 transcription and release by interacting with C/EBP-β. Oncotarget 2018; 7:75064-75080. [PMID: 27634894 PMCID: PMC5342723 DOI: 10.18632/oncotarget.11991] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Accepted: 09/02/2016] [Indexed: 01/09/2023] Open
Abstract
Porcine epidemic diarrhea is a devastating swine enteric disease, which is caused by porcine epidemic diarrhea virus (PEDV) infection. Our studies demonstrated that PEDV infection resulted in the up-regulation of proinflammatory cytokines. Meanwhile, PEDV infection and overexpression of viral nucleoprotein resulted in the acetylation and release of high mobility group box 1 proteins in vitro, an important proinflammatory response mediator, which contributes to the pathogenesis of various inflammatory diseases. Our studies also showed that SIRT1, histone acetyltransferase, and NF-κB regulated the acetylation and release of HMGB1. Chromatin immunoprecipitation, dual-luciferase reporter gene assay, and co-immunoprecipitation experiments illustrated that PEDV-N could induce HMGB1 transcription by interacting with C/EBP-β, which could bind to C/EBP motif in HMGB1 promotor region. Collectively, our data indicate PEDV-N contributes to HMGB1 transcription and the subsequent release/acetylation of HMGB1 during PEDV infection.
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Affiliation(s)
- Chang-Chao Huan
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu Province, China, 210095
| | - Hua-Xia Wang
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu Province, China, 210095
| | - Xiang-Xiang Sheng
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu Province, China, 210095
| | - Rui Wang
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu Province, China, 210095
| | - Xin Wang
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu Province, China, 210095
| | - Ying Liao
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China, 200241
| | - Qin-Fang Liu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China, 200241
| | - Guang-Zhi Tong
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China, 200241
| | - Chan Ding
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China, 200241
| | - Hong-Jie Fan
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu Province, China, 210095
| | - Jia-Qiang Wu
- Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Shandong Province, China, 250100
| | - Xiang Mao
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu Province, China, 210095.,Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, China, 200241
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22
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Yi C, Zhao Z, Wang S, Sun X, Zhang D, Sun X, Zhang A, Jin M. Influenza A Virus PA Antagonizes Interferon-β by Interacting with Interferon Regulatory Factor 3. Front Immunol 2017; 8:1051. [PMID: 28955326 PMCID: PMC5600993 DOI: 10.3389/fimmu.2017.01051] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2017] [Accepted: 08/14/2017] [Indexed: 01/07/2023] Open
Abstract
The influenza A virus (IAV) can be recognized by retinoic acid-inducible gene I (RIG-I) to activate the type I interferon response and induce antiviral effects. The virus has evolved several strategies to evade the innate immune response, including non-structural protein 1 (NS1) and its polymerase subunits. The mechanism by which NS1 inhibits interferon-β (IFN-β) is well understood, whereas the mechanism by which polymerase acid protein (PA) inhibits IFN-β remains to be elucidated. In this study, we observed that the IAV PA protein could inhibit the production of IFN-β and interferon-stimulated genes induced by Sendai virus through interferon regulatory factor 3 (IRF3), but not through nuclear factor-kappaB (NF-kappaB). In addition, PA inhibited IFN-β induction by RIG-I, melanoma differentiation-associated gene 5, mitochondria antiviral signaling protein, TANK-binding kinase 1, inhibitor of nuclear factor kappa-B kinase-ε (IKKε), and IRF3 overexpression. Furthermore, PA interacted with IRF3 to block its activation. The N-terminal endonuclease activity of PA was responsible for its interaction with IRF3 and inhibition of the IFN-β signaling pathway. In summary, our data reveal the mechanism by which IAV PA inhibits the IFN-β signaling pathway, providing a new mechanism by which the virus antagonizes the antiviral signaling pathway.
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Affiliation(s)
- Chenyang Yi
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China.,Laboratory of Animal Virology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,The Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan, China
| | - Zongzheng Zhao
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China.,Laboratory of Animal Virology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,The Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan, China
| | - Shengyu Wang
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China.,Laboratory of Animal Virology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,The Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan, China
| | - Xin Sun
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China.,Laboratory of Animal Virology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,The Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan, China
| | - Dan Zhang
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China.,Laboratory of Animal Virology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,The Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan, China
| | - Xiaomei Sun
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China.,Laboratory of Animal Virology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,The Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan, China
| | - Anding Zhang
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China.,Laboratory of Animal Virology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,The Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan, China
| | - Meilin Jin
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China.,Laboratory of Animal Virology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,The Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan, China
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23
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Ilyushina NA, Lugovtsev VY, Samsonova AP, Sheikh FG, Bovin NV, Donnelly RP. Generation and characterization of interferon-lambda 1-resistant H1N1 influenza A viruses. PLoS One 2017; 12:e0181999. [PMID: 28750037 PMCID: PMC5531537 DOI: 10.1371/journal.pone.0181999] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Accepted: 07/11/2017] [Indexed: 12/22/2022] Open
Abstract
Influenza A viruses pose a constant potential threat to human health. In view of the innate antiviral activity of interferons (IFNs) and their potential use as anti-influenza agents, it is important to know whether viral resistance to these antiviral proteins can arise. To examine the likelihood of emergence of IFN-λ1-resistant H1N1 variants, we serially passaged the A/California/04/09 (H1N1) strain in a human lung epithelial cell line (Calu-3) in the presence of increasing concentrations of recombinant IFN-λ1 protein. To monitor changes associated with adaptation of this virus to growth in Calu-3 cells, we also passaged the wild-type virus in the absence of IFN-λ1. Under IFN-λ1 selective pressure, the parental virus developed two neuraminidase (NA) mutations, S79L and K331N, which significantly reduced NA enzyme activity (↓1.4-fold) and sensitivity to IFN-λ1 (↓˃20-fold), respectively. These changes were not associated with a reduction in viral replication levels. Mutants carrying either K331N alone or S79L and K331N together induced weaker phosphorylation of IFN regulatory factor 3 (IRF3), and, as a consequence, much lower expression of the IFN genes (IFNB1, IFNL1 and IFNL2/3) and proteins (IFN-λ1 and IFN-λ2/3). The lower levels of IFN expression correlated with weaker induction of tyrosine-phosphorylated STAT1 and reduced RIG-I protein levels. Our findings demonstrate that influenza viruses can develop increased resistance to the antiviral activity of type III interferons.
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MESH Headings
- Amino Acid Substitution/genetics
- Animals
- Antiviral Agents/pharmacology
- Cell Line
- DEAD Box Protein 58/metabolism
- DNA-Directed RNA Polymerases/metabolism
- Dogs
- Drug Resistance, Viral/drug effects
- Enzyme-Linked Immunosorbent Assay
- Gene Expression Regulation/drug effects
- Humans
- Immunity, Innate/drug effects
- Influenza A Virus, H1N1 Subtype/drug effects
- Influenza A Virus, H1N1 Subtype/genetics
- Influenza A Virus, H1N1 Subtype/growth & development
- Influenza A Virus, H1N1 Subtype/physiology
- Interferon Regulatory Factor-3/metabolism
- Interferons
- Interleukins/pharmacology
- Mutation/genetics
- Neuraminidase/genetics
- Phosphorylation/drug effects
- Receptors, Immunologic
- Receptors, Virus/genetics
- Recombination, Genetic/genetics
- STAT1 Transcription Factor/metabolism
- Sequence Analysis, DNA
- Virus Replication/drug effects
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Affiliation(s)
- Natalia A. Ilyushina
- Division of Biotechnology Research and Review II, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, Maryland, United States of America
| | - Vladimir Y. Lugovtsev
- Division of Viral Products, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland, United States of America
| | - Anastasia P. Samsonova
- Division of Viral Products, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland, United States of America
| | - Faruk G. Sheikh
- Division of Biotechnology Research and Review II, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, Maryland, United States of America
| | - Nicolai V. Bovin
- Carbohydrate Chemistry Laboratory, Shemyakin Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Raymond P. Donnelly
- Division of Biotechnology Research and Review II, Center for Drug Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, Maryland, United States of America
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24
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Vijayan M, Xia C, Song YE, Ngo H, Studstill CJ, Drews K, Fox TE, Johnson MC, Hiscott J, Kester M, Alexander S, Hahm B. Sphingosine 1-Phosphate Lyase Enhances the Activation of IKKε To Promote Type I IFN-Mediated Innate Immune Responses to Influenza A Virus Infection. THE JOURNAL OF IMMUNOLOGY 2017; 199:677-687. [PMID: 28600291 DOI: 10.4049/jimmunol.1601959] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Accepted: 05/12/2017] [Indexed: 12/28/2022]
Abstract
Sphingosine 1-phosphate (S1P) lyase (SPL) is an intracellular enzyme that mediates the irreversible degradation of the bioactive lipid S1P. We have previously reported that overexpressed SPL displays anti-influenza viral activity; however, the underlying mechanism is incompletely understood. In this study, we demonstrate that SPL functions as a positive regulator of IKKε to propel type I IFN-mediated innate immune responses against viral infection. Exogenous SPL expression inhibited influenza A virus replication, which correlated with an increase in type I IFN production and IFN-stimulated gene accumulation upon infection. In contrast, the lack of SPL expression led to an elevated cellular susceptibility to influenza A virus infection. In support of this, SPL-deficient cells were defective in mounting an effective IFN response when stimulated by influenza viral RNAs. SPL augmented the activation status of IKKε and enhanced the kinase-induced phosphorylation of IRF3 and the synthesis of type I IFNs. However, the S1P degradation-incompetent form of SPL also enhanced IFN responses, suggesting that SPL's pro-IFN function is independent of S1P. Biochemical analyses revealed that SPL, as well as the mutant form of SPL, interacts with IKKε. Importantly, when endogenous IKKε was downregulated using a small interfering RNA approach, SPL's anti-influenza viral activity was markedly suppressed. This indicates that IKKε is crucial for SPL-mediated inhibition of influenza virus replication. Thus, the results illustrate the functional significance of the SPL-IKKε-IFN axis during host innate immunity against viral infection.
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Affiliation(s)
- Madhuvanthi Vijayan
- Department of Surgery, University of Missouri, Columbia, MO 65212.,Department of Molecular Microbiology and Immunology, University of Missouri, Columbia, MO 65212
| | - Chuan Xia
- Department of Surgery, University of Missouri, Columbia, MO 65212.,Department of Molecular Microbiology and Immunology, University of Missouri, Columbia, MO 65212
| | - Yul Eum Song
- Department of Molecular Microbiology and Immunology, University of Missouri, Columbia, MO 65212
| | - Hanh Ngo
- Department of Surgery, University of Missouri, Columbia, MO 65212.,Department of Molecular Microbiology and Immunology, University of Missouri, Columbia, MO 65212
| | - Caleb J Studstill
- Department of Surgery, University of Missouri, Columbia, MO 65212.,Department of Molecular Microbiology and Immunology, University of Missouri, Columbia, MO 65212
| | - Kelly Drews
- Department of Pathology, University of Virginia, Charlottesville, VA 22908
| | - Todd E Fox
- Department of Pharmacology, University of Virginia, Charlottesville, VA 22908
| | - Marc C Johnson
- Department of Molecular Microbiology and Immunology, University of Missouri, Columbia, MO 65212
| | - John Hiscott
- Istituto Pasteur-Fondazione Cenci Bolognetti, 00161 Rome, Italy; and
| | - Mark Kester
- Department of Pharmacology, University of Virginia, Charlottesville, VA 22908
| | - Stephen Alexander
- Division of Biological Sciences, University of Missouri, Columbia, MO 65211
| | - Bumsuk Hahm
- Department of Surgery, University of Missouri, Columbia, MO 65212; .,Department of Molecular Microbiology and Immunology, University of Missouri, Columbia, MO 65212
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25
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Paces J, Nic M, Novotny T, Svoboda P. Literature review of baseline information to support the risk assessment of RNAi‐based GM plants. ACTA ACUST UNITED AC 2017. [PMCID: PMC7163844 DOI: 10.2903/sp.efsa.2017.en-1246] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Jan Paces
- Institute of Molecular Genetics of the Academy of Sciences of the Czech Republic (IMG)
| | | | | | - Petr Svoboda
- Institute of Molecular Genetics of the Academy of Sciences of the Czech Republic (IMG)
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26
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Gao Z, Hu J, Liang Y, Yang Q, Yan K, Liu D, Wang X, Gu M, Liu X, Hu S, Hu Z, Liu H, Liu W, Chen S, Peng D, Jiao XA, Liu X. Generation and Comprehensive Analysis of Host Cell Interactome of the PA Protein of the Highly Pathogenic H5N1 Avian Influenza Virus in Mammalian Cells. Front Microbiol 2017; 8:739. [PMID: 28503168 PMCID: PMC5408021 DOI: 10.3389/fmicb.2017.00739] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Accepted: 04/10/2017] [Indexed: 12/26/2022] Open
Abstract
Accumulating data have identified the important roles of PA protein in replication and pathogenicity of influenza A virus (IAV). Identification of host factors that interact with the PA protein may accelerate our understanding of IAV pathogenesis. In this study, using immunoprecipitation assay combined with liquid chromatography-tandem mass spectrometry, we identified 278 human cellular proteins that might interact with PA of H5N1 IAV. Gene Ontology annotation revealed that the identified proteins are highly associated with viral translation and replication. Further KEGG pathway analysis of the interactome profile highlighted cellular pathways associated with translation, infectious disease, and signal transduction. In addition, Diseases and Functions analysis suggested that these cellular proteins are highly related with Organismal Injury and Abnormalities and Cell Death and Survival. Moreover, two cellular proteins (nucleolin and eukaryotic translation elongation factor 1-alpha 1) identified both in this study and others were further validated to interact with PA using co-immunoprecipitation and co-localization assays. Therefore, this study presented the interactome data of H5N1 IAV PA protein in human cells which may provide novel cellular target proteins for elucidating the potential molecular functions of PA in regulating the lifecycle of IAV in human cells.
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Affiliation(s)
- Zhao Gao
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou UniversityYangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Jiangsu Key Laboratory of Zoonosis, Yangzhou UniversityYangzhou, China
| | - Jiao Hu
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou UniversityYangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Jiangsu Key Laboratory of Zoonosis, Yangzhou UniversityYangzhou, China
| | - Yanyan Liang
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou UniversityYangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Jiangsu Key Laboratory of Zoonosis, Yangzhou UniversityYangzhou, China
| | - Qian Yang
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou UniversityYangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Jiangsu Key Laboratory of Zoonosis, Yangzhou UniversityYangzhou, China
| | - Kun Yan
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou UniversityYangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Jiangsu Key Laboratory of Zoonosis, Yangzhou UniversityYangzhou, China
| | - Dong Liu
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou UniversityYangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Jiangsu Key Laboratory of Zoonosis, Yangzhou UniversityYangzhou, China
| | - Xiaoquan Wang
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou UniversityYangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Jiangsu Key Laboratory of Zoonosis, Yangzhou UniversityYangzhou, China
| | - Min Gu
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou UniversityYangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Jiangsu Key Laboratory of Zoonosis, Yangzhou UniversityYangzhou, China
| | - Xiaowen Liu
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou UniversityYangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Jiangsu Key Laboratory of Zoonosis, Yangzhou UniversityYangzhou, China
| | - Shunlin Hu
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou UniversityYangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Jiangsu Key Laboratory of Zoonosis, Yangzhou UniversityYangzhou, China
| | - Zenglei Hu
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou UniversityYangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Jiangsu Key Laboratory of Zoonosis, Yangzhou UniversityYangzhou, China
| | - Huimou Liu
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou UniversityYangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Jiangsu Key Laboratory of Zoonosis, Yangzhou UniversityYangzhou, China
| | - Wenbo Liu
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou UniversityYangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Jiangsu Key Laboratory of Zoonosis, Yangzhou UniversityYangzhou, China
| | - Sujuan Chen
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou UniversityYangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Jiangsu Key Laboratory of Zoonosis, Yangzhou UniversityYangzhou, China
| | - Daxin Peng
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou UniversityYangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Jiangsu Key Laboratory of Zoonosis, Yangzhou UniversityYangzhou, China
| | - Xin-An Jiao
- Jiangsu Key Laboratory of Zoonosis, Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou UniversityYangzhou, China
| | - Xiufan Liu
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, Yangzhou UniversityYangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Jiangsu Key Laboratory of Zoonosis, Yangzhou UniversityYangzhou, China
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27
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Standing on three legs: antiviral activities of RIG-I against influenza viruses. Curr Opin Immunol 2016; 42:71-75. [DOI: 10.1016/j.coi.2016.05.016] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Accepted: 05/29/2016] [Indexed: 12/12/2022]
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28
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To Conquer the Host, Influenza Virus Is Packing It In: Interferon-Antagonistic Strategies beyond NS1. J Virol 2016; 90:8389-94. [PMID: 27440898 DOI: 10.1128/jvi.00041-16] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The nonstructural protein NS1 is well established as a virulence factor of influenza A virus counteracting induction of the antiviral type I interferon system. Recent studies now show that viral structural proteins, their derivatives, and even the genome itself also contribute to keeping the host defense under control. Here, we summarize the current knowledge on these NS1-independent interferon escape strategies.
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29
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Amino acid changes in PB2 and HA affect the growth of a recombinant influenza virus expressing a fluorescent reporter protein. Sci Rep 2016; 6:19933. [PMID: 26847414 PMCID: PMC4742795 DOI: 10.1038/srep19933] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Accepted: 12/21/2015] [Indexed: 12/19/2022] Open
Abstract
Influenza viruses that express reporter proteins are useful tools, but are often attenuated. Recently, we found that an influenza virus encoding the Venus fluorescent protein acquired two mutations in its PB2 and HA proteins upon mouse adaptation. Here, we demonstrate that the enhanced viral replication and virulence in mice of this Venus-expressing influenza virus are primarily conferred by the PB2-E712D mutation, with only a minor contribution by the HA-T380A mutation.
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30
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Hemagglutinin of Influenza A Virus Antagonizes Type I Interferon (IFN) Responses by Inducing Degradation of Type I IFN Receptor 1. J Virol 2015; 90:2403-17. [PMID: 26676772 DOI: 10.1128/jvi.02749-15] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Accepted: 12/08/2015] [Indexed: 12/15/2022] Open
Abstract
UNLABELLED Influenza A virus (IAV) employs diverse strategies to circumvent type I interferon (IFN) responses, particularly by inhibiting the synthesis of type I IFNs. However, it is poorly understood if and how IAV regulates the type I IFN receptor (IFNAR)-mediated signaling mode. In this study, we demonstrate that IAV induces the degradation of IFNAR subunit 1 (IFNAR1) to attenuate the type I IFN-induced antiviral signaling pathway. Following infection, the level of IFNAR1 protein, but not mRNA, decreased. Indeed, IFNAR1 was phosphorylated and ubiquitinated by IAV infection, which resulted in IFNAR1 elimination. The transiently overexpressed IFNAR1 displayed antiviral activity by inhibiting virus replication. Importantly, the hemagglutinin (HA) protein of IAV was proved to trigger the ubiquitination of IFNAR1, diminishing the levels of IFNAR1. Further, influenza A viral HA1 subunit, but not HA2 subunit, downregulated IFNAR1. However, viral HA-mediated degradation of IFNAR1 was not caused by the endoplasmic reticulum (ER) stress response. IAV HA robustly reduced cellular sensitivity to type I IFNs, suppressing the activation of STAT1/STAT2 and induction of IFN-stimulated antiviral proteins. Taken together, our findings suggest that IAV HA causes IFNAR1 degradation, which in turn helps the virus escape the powerful innate immune system. Thus, the research elucidated an influenza viral mechanism for eluding the IFNAR signaling pathway, which could provide new insights into the interplay between influenza virus and host innate immunity. IMPORTANCE Influenza A virus (IAV) infection causes significant morbidity and mortality worldwide and remains a major health concern. When triggered by influenza viral infection, host cells produce type I interferon (IFN) to block viral replication. Although IAV was shown to have diverse strategies to evade this powerful, IFN-mediated antiviral response, it is not well-defined if IAV manipulates the IFN receptor-mediated signaling pathway. Here, we uncovered that influenza viral hemagglutinin (HA) protein causes the degradation of type I IFN receptor subunit 1 (IFNAR1). HA promoted phosphorylation and polyubiquitination of IFNAR1, which facilitated the degradation of this receptor. The HA-mediated elimination of IFNAR1 notably decreased the cells' sensitivities to type I IFNs, as demonstrated by the diminished expression of IFN-induced antiviral genes. This discovery could help us understand how IAV regulates the host innate immune response to create an environment optimized for viral survival in host cells.
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31
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Killip MJ, Fodor E, Randall RE. Influenza virus activation of the interferon system. Virus Res 2015; 209:11-22. [PMID: 25678267 PMCID: PMC4638190 DOI: 10.1016/j.virusres.2015.02.003] [Citation(s) in RCA: 135] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2014] [Revised: 01/28/2015] [Accepted: 02/02/2015] [Indexed: 12/24/2022]
Abstract
The host interferon (IFN) response represents one of the first barriers that influenza viruses must surmount in order to establish an infection. Many advances have been made in recent years in understanding the interactions between influenza viruses and the interferon system. In this review, we summarise recent work regarding activation of the type I IFN response by influenza viruses, including attempts to identify the viral RNA responsible for IFN induction, the stage of the virus life cycle at which it is generated and the role of defective viruses in this process.
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Affiliation(s)
- Marian J Killip
- Biomedical Sciences Research Complex, University of St Andrews, North Haugh, St Andrews, Fife KY16 9ST, UK; Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK.
| | - Ervin Fodor
- Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK
| | - Richard E Randall
- Biomedical Sciences Research Complex, University of St Andrews, North Haugh, St Andrews, Fife KY16 9ST, UK
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32
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Abstract
Retinoic-acid inducible gene I (RIG-I) is a major pattern recognition receptor of the innate immune system. RIG-I is a cytoplasmic RNA helicase that is able to bind virus-specific RNA structures. Activated RIG-I switches into a conformation that locks the ligand RNA and signals via the MAVS-IRF-3 axis, resulting in the upregulation of antiviral interferons. Recent evidence suggests that the binding of RIG-I to regulatory RNA structures of two major human pathogens, influenza A virus and hepatitis B virus, can inhibit viral replication independent of the subsequent signal transduction. Thus, RIG-I rides a two-pronged attack, with an early-hitting, direct inhibition via occupancy of viral regulatory RNA structures, and a delayed response via signaling and induction of interferons.
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Affiliation(s)
- Friedemann Weber
- Institute for Virology, FB10-Veterinary Medicine, Justus-Liebig University, D-35392 Giessen, Germany.
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33
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Zhang XE, Cui Z, Wang D. Sensing of biomolecular interactions using fluorescence complementing systems in living cells. Biosens Bioelectron 2015; 76:243-50. [PMID: 26316254 DOI: 10.1016/j.bios.2015.07.069] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2015] [Revised: 07/28/2015] [Accepted: 07/29/2015] [Indexed: 01/09/2023]
Abstract
Sensing biomolecule interactions in living cells allows for a deeper understanding of the mechanisms governing biological processes, and has increasing significance for improvements in clinical diagnosis. It is now possible by using molecular biosensors. One method involving molecular biosensors is called molecular fluorescence complementation, usually referred to as BiFC (bimolecular fragment/fluorescence complementary/complementation) or TriFC (trimolecular fragment complementary/complementation). This complementation method is based on the principle that two non-fluorescent fragments of a fluorescent protein are brought into sufficient lyclose proximity, upon which they are reconstructed so that fluorescence is re-established. This process relies on the interaction between the two fusion partners, which normally are proteins. This method is simple, noninvasive, sensitive, and does not require specialized tools, hence being available to most standard laboratories. Here, we selectively describe three relevant examples, although many other molecular interactions have been shown to work with this method. Recent developments of this method include multicolor BiFC, which allows for simultaneous detection of multi-biomolecule interactions, RNA-protein interactions, far red and near infrared sensing systems for deep tissue imaging. Challenges in the utilization of this method are discussed. Given the current rate of technological advancements, we believe that fluorescence fragment complementing systems have the potential to be utilized across a wide range of areas, including in routine research and clinical diagnosis.
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Affiliation(s)
- Xian-En Zhang
- National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.
| | - Zongqiang Cui
- State Key Laboratory of Virology and Center for Analytical Microbiology, Wuhan Institute of Virology, Chinese Academy of Sciences, China
| | - Dianbing Wang
- National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
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Liu G, Park HS, Pyo HM, Liu Q, Zhou Y. Influenza A Virus Panhandle Structure Is Directly Involved in RIG-I Activation and Interferon Induction. J Virol 2015; 89:6067-79. [PMID: 25810557 PMCID: PMC4442436 DOI: 10.1128/jvi.00232-15] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Accepted: 03/21/2015] [Indexed: 12/24/2022] Open
Abstract
UNLABELLED Retinoic acid-inducible gene I (RIG-I) is an important innate immune sensor that recognizes viral RNA in the cytoplasm. Its nonself recognition largely depends on the unique RNA structures imposed by viral RNA. The panhandle structure residing in the influenza A virus (IAV) genome, whose primary function is to serve as the viral promoter for transcription and replication, has been proposed to be a RIG-I agonist. However, this has never been proved experimentally. Here, we employed multiple approaches to determine if the IAV panhandle structure is directly involved in RIG-I activation and type I interferon (IFN) induction. First, in porcine alveolar macrophages, we demonstrated that the viral genomic coding region is dispensable for RIG-I-dependent IFN induction. Second, using in vitro-synthesized hairpin RNA, we showed that the IAV panhandle structure could directly bind to RIG-I and stimulate IFN production. Furthermore, we investigated the contributions of the wobble base pairs, mismatch, and unpaired nucleotides within the wild-type panhandle structure to RIG-I activation. Elimination of these destabilizing elements within the panhandle structure promoted RIG-I activation and IFN induction. Given the function of the panhandle structure as the viral promoter, we further monitored the promoter activity of these panhandle variants and found that viral replication was moderately affected, whereas viral transcription was impaired dramatically. In all, our results indicate that the IAV panhandle promoter region adopts a nucleotide composition that is optimal for balanced viral RNA synthesis and suboptimal for RIG-I activation. IMPORTANCE The IAV genomic panhandle structure has been proposed to be an RIG-I agonist due to its partial complementarity; however, this has not been experimentally confirmed. Here, we provide direct evidence that the IAV panhandle structure is competent in, and sufficient for, RIG-I activation and IFN induction. By constructing panhandle variants with increased complementarity, we demonstrated that the wild-type panhandle structure could be modified to enhance RIG-I activation and IFN induction. These panhandle variants posed moderate influence on viral replication but dramatic impairment of viral transcription. These results indicate that the IAV panhandle promoter region adopts a nucleotide composition to achieve optimal balance of viral RNA synthesis and suboptimal RIG-I activation. Our results highlight the multifunctional role of the IAV panhandle promoter region in the virus life cycle and offer novel insights into the development of antiviral agents aiming to boost RIG-I signaling or virus attenuation by manipulating this conserved region.
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Affiliation(s)
- GuanQun Liu
- Vaccine and Infectious Disease Organization-International Vaccine Center, University of Saskatchewan, Saskatoon, Saskatchewan, Canada Vaccinology & Immunotherapeutics Program, School of Public Health, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Hong-Su Park
- Vaccine and Infectious Disease Organization-International Vaccine Center, University of Saskatchewan, Saskatoon, Saskatchewan, Canada Department of Veterinary Microbiology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Hyun-Mi Pyo
- Vaccine and Infectious Disease Organization-International Vaccine Center, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Qiang Liu
- Vaccine and Infectious Disease Organization-International Vaccine Center, University of Saskatchewan, Saskatoon, Saskatchewan, Canada Vaccinology & Immunotherapeutics Program, School of Public Health, University of Saskatchewan, Saskatoon, Saskatchewan, Canada Department of Veterinary Microbiology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Yan Zhou
- Vaccine and Infectious Disease Organization-International Vaccine Center, University of Saskatchewan, Saskatoon, Saskatchewan, Canada Vaccinology & Immunotherapeutics Program, School of Public Health, University of Saskatchewan, Saskatoon, Saskatchewan, Canada Department of Veterinary Microbiology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
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Weber M, Sediri H, Felgenhauer U, Binzen I, Bänfer S, Jacob R, Brunotte L, García-Sastre A, Schmid-Burgk JL, Schmidt T, Hornung V, Kochs G, Schwemmle M, Klenk HD, Weber F. Influenza virus adaptation PB2-627K modulates nucleocapsid inhibition by the pathogen sensor RIG-I. Cell Host Microbe 2015; 17:309-319. [PMID: 25704008 PMCID: PMC4359673 DOI: 10.1016/j.chom.2015.01.005] [Citation(s) in RCA: 101] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Revised: 10/24/2014] [Accepted: 01/05/2015] [Indexed: 12/16/2022]
Abstract
The cytoplasmic RNA helicase RIG-I mediates innate sensing of RNA viruses. The genomes of influenza A virus (FLUAV) are encapsidated by the nucleoprotein and associated with RNA polymerase, posing potential barriers to RIG-I sensing. We show that RIG-I recognizes the 5'-triphosphorylated dsRNA on FLUAV nucleocapsids but that polymorphisms at position 627 of the viral polymerase subunit PB2 modulate RIG-I sensing. Compared to mammalian-adapted PB2-627K, avian FLUAV nucleocapsids possessing PB2-627E are prone to increased RIG-I recognition, and RIG-I-deficiency partially restores PB2-627E virus infection of mammalian cells. Heightened RIG-I sensing of PB2-627E nucleocapsids correlates with previously established lower affinity of 627E-containing PB2 for nucleoprotein and is increased by further nucleocapsid instability. The effect of RIG-I on PB2-627E nucleocapsids is independent of antiviral signaling, suggesting that RIG-I-nucleocapsid binding alone can inhibit infection. These results indicate that RIG-I is a direct avian FLUAV restriction factor and highlight nucleocapsid disruption as an antiviral strategy.
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Affiliation(s)
- Michaela Weber
- Institute for Virology, Philipps-University Marburg, D-35043 Marburg, Germany
| | - Hanna Sediri
- Institute for Virology, Philipps-University Marburg, D-35043 Marburg, Germany
| | - Ulrike Felgenhauer
- Institute for Virology, Philipps-University Marburg, D-35043 Marburg, Germany
| | - Ina Binzen
- Institute for Virology, Philipps-University Marburg, D-35043 Marburg, Germany
| | - Sebastian Bänfer
- Department of Cell Biology and Cell Pathology, Philipps-University Marburg, D-35043 Marburg, Germany
| | - Ralf Jacob
- Department of Cell Biology and Cell Pathology, Philipps-University Marburg, D-35043 Marburg, Germany
| | - Linda Brunotte
- Institute for Virology, University Medical Center, D-79008 Freiburg, Germany
| | - Adolfo García-Sastre
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Department of Medicine, Division of Infectious Diseases, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Jonathan L Schmid-Burgk
- Institute of Molecular Medicine, University Hospital, University of Bonn, D-53127 Bonn, Germany
| | - Tobias Schmidt
- Institute of Molecular Medicine, University Hospital, University of Bonn, D-53127 Bonn, Germany
| | - Veit Hornung
- Institute of Molecular Medicine, University Hospital, University of Bonn, D-53127 Bonn, Germany
| | - Georg Kochs
- Institute for Virology, University Medical Center, D-79008 Freiburg, Germany
| | - Martin Schwemmle
- Institute for Virology, University Medical Center, D-79008 Freiburg, Germany
| | - Hans-Dieter Klenk
- Institute for Virology, Philipps-University Marburg, D-35043 Marburg, Germany
| | - Friedemann Weber
- Institute for Virology, Philipps-University Marburg, D-35043 Marburg, Germany.
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Ma DY, Suthar MS. Mechanisms of innate immune evasion in re-emerging RNA viruses. Curr Opin Virol 2015; 12:26-37. [PMID: 25765605 PMCID: PMC4470747 DOI: 10.1016/j.coviro.2015.02.005] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Revised: 02/18/2015] [Accepted: 02/19/2015] [Indexed: 01/10/2023]
Abstract
RNA viruses passively evade host detection by masking viral PAMPs and replicating within vesicles. Many emerging viruses harbor multiple strategies for innate immune evasion. Viral antagonists have been found to target the pattern recognition receptor and interferon signaling pathways. Knowledge of host–pathogen interactions is essential for vaccine/therapeutic development and understanding innate immunity.
Recent outbreaks of Ebola, West Nile, Chikungunya, Middle Eastern Respiratory and other emerging/re-emerging RNA viruses continue to highlight the need to further understand the virus–host interactions that govern disease severity and infection outcome. As part of the early host antiviral defense, the innate immune system mediates pathogen recognition and initiation of potent antiviral programs that serve to limit virus replication, limit virus spread and activate adaptive immune responses. Concordantly, viral pathogens have evolved several strategies to counteract pathogen recognition and cell-intrinsic antiviral responses. In this review, we highlight the major mechanisms of innate immune evasion by emerging and re-emerging RNA viruses, focusing on pathogens that pose significant risk to public health.
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Affiliation(s)
- Daphne Y Ma
- Department of Pediatrics and Children's Healthcare of Atlanta, Emory University School of Medicine, Atlanta, GA 30329, USA; Emory Vaccine Center, Yerkes National Primate Research Center, Atlanta, GA 30329, USA
| | - Mehul S Suthar
- Department of Pediatrics and Children's Healthcare of Atlanta, Emory University School of Medicine, Atlanta, GA 30329, USA; Emory Vaccine Center, Yerkes National Primate Research Center, Atlanta, GA 30329, USA.
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Liedmann S, Hrincius ER, Guy C, Anhlan D, Dierkes R, Carter R, Wu G, Staeheli P, Green DR, Wolff T, McCullers JA, Ludwig S, Ehrhardt C. Viral suppressors of the RIG-I-mediated interferon response are pre-packaged in influenza virions. Nat Commun 2014; 5:5645. [PMID: 25487526 PMCID: PMC4268707 DOI: 10.1038/ncomms6645] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Accepted: 10/23/2014] [Indexed: 12/16/2022] Open
Abstract
The type I interferon (IFN) response represents the first line of defence to invading pathogens. Internalized viral ribonucleoproteins (vRNPs) of negative-strand RNA viruses induce an early IFN response by interacting with retinoic acid inducible gene I (RIG-I) and its recruitment to mitochondria. Here we employ three-dimensional stochastic optical reconstruction microscopy (STORM) to visualize incoming influenza A virus (IAV) vRNPs as helical-like structures associated with mitochondria. Unexpectedly, an early IFN induction in response to vRNPs is not detected. A distinct amino-acid motif in the viral polymerases, PB1/PA, suppresses early IFN induction. Mutation of this motif leads to reduced pathogenicity in vivo, whereas restoration increases it. Evolutionary dynamics in these sequences suggest that completion of the motif, combined with viral reassortment can contribute to pandemic risks. In summary, inhibition of the immediate anti-viral response is 'pre-packaged' in IAV in the sequences of vRNP-associated polymerase proteins.
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Affiliation(s)
- Swantje Liedmann
- Institute of Molecular Virology (IMV), Center for Molecular Biology of Inflammation (ZMBE), University of Muenster, Von-Esmarch-Street 56, D-48149 Muenster, Germany
| | - Eike R. Hrincius
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, Tennessee 38105-3678, USA
| | - Cliff Guy
- Department of Immunology, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, Tennessee 38105-3678, USA
| | - Darisuren Anhlan
- Institute of Molecular Virology (IMV), Center for Molecular Biology of Inflammation (ZMBE), University of Muenster, Von-Esmarch-Street 56, D-48149 Muenster, Germany
| | - Rüdiger Dierkes
- Institute of Molecular Virology (IMV), Center for Molecular Biology of Inflammation (ZMBE), University of Muenster, Von-Esmarch-Street 56, D-48149 Muenster, Germany
| | - Robert Carter
- Department of Computational Biology, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, Tennessee 38105-3678, USA
| | - Gang Wu
- Department of Computational Biology, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, Tennessee 38105-3678, USA
| | - Peter Staeheli
- Institute of Virology, University Medical Center Freiburg, Hermann-Herder-Street 11, D-79104 Freiburg, Germany
| | - Douglas R. Green
- Department of Immunology, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, Tennessee 38105-3678, USA
| | - Thorsten Wolff
- Division of Influenza and Other Respiratory Viruses, Seestraβe 10, Robert Koch-Institut, D-13353 Berlin, Germany
| | - Jonathan A. McCullers
- Department of Infectious Diseases, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, Tennessee 38105-3678, USA
- Department of Pediatrics, University of Tennessee Health Sciences Center, 50 N. Dunlap, Memphis, Tennessee 38103, USA
| | - Stephan Ludwig
- Institute of Molecular Virology (IMV), Center for Molecular Biology of Inflammation (ZMBE), University of Muenster, Von-Esmarch-Street 56, D-48149 Muenster, Germany
- Cluster of Excellence Cells in Motion, University of Muenster, Muenster, Germany
| | - Christina Ehrhardt
- Institute of Molecular Virology (IMV), Center for Molecular Biology of Inflammation (ZMBE), University of Muenster, Von-Esmarch-Street 56, D-48149 Muenster, Germany
- Cluster of Excellence Cells in Motion, University of Muenster, Muenster, Germany
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