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Li M. Innate immune response against vector-borne bunyavirus infection and viral countermeasures. Front Cell Infect Microbiol 2024; 14:1365221. [PMID: 38711929 PMCID: PMC11070517 DOI: 10.3389/fcimb.2024.1365221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Accepted: 03/29/2024] [Indexed: 05/08/2024] Open
Abstract
Bunyaviruses are a large group of important viral pathogens that cause significant diseases in humans and animals worldwide. Bunyaviruses are enveloped, single-stranded, negative-sense RNA viruses that infect a wide range of hosts. Upon entry into host cells, the components of viruses are recognized by host innate immune system, leading to the activation of downstream signaling cascades to induce interferons (IFNs) and other proinflammatory cytokines. IFNs bind to their receptors and upregulate the expression of hundreds of interferon-stimulated genes (ISGs). Many ISGs have antiviral activities and confer an antiviral state to host cells. For efficient replication and spread, viruses have evolved different strategies to antagonize IFN-mediated restriction. Here, we discuss recent advances in our understanding of the interactions between bunyaviruses and host innate immune response.
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Affiliation(s)
- Minghua Li
- Department of Pathology, University of Texas Medical Branch, Galveston, TX, United States
- Center for Biodefense and Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, TX, United States
- Center for Tropical Diseases, University of Texas Medical Branch, Galveston, TX, United States
- Institute for Human Infections and Immunity, University of Texas Medical Branch, Galveston, TX, United States
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2
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Wang Y, Zhang C, Gao J, Chen Z, Liu Z, Huang J, Chen Y, Li Z, Chang N, Tao Y, Tang H, Gao X, Xu Y, Wang C, Li D, Liu X, Pan J, Cai W, Gong P, Luo Y, Liang W, Liu Q, Stenseth NC, Yang R, Xu L. Spatiotemporal trends of hemorrhagic fever with renal syndrome (HFRS) in China under climate variation. Proc Natl Acad Sci U S A 2024; 121:e2312556121. [PMID: 38227655 PMCID: PMC10823223 DOI: 10.1073/pnas.2312556121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2023] [Accepted: 12/05/2023] [Indexed: 01/18/2024] Open
Abstract
Hemorrhagic fever with renal syndrome (HFRS) is a zoonotic disease caused by the rodent-transmitted orthohantaviruses (HVs), with China possessing the most cases globally. The virus hosts in China are Apodemus agrarius and Rattus norvegicus, and the disease spread is strongly influenced by global climate dynamics. To assess and predict the spatiotemporal trends of HFRS from 2005 to 2098, we collected historical HFRS data in mainland China (2005-2020), historical and projected climate and population data (2005-2098), and spatial variables including biotic, environmental, topographical, and socioeconomic. Spatiotemporal predictions and mapping were conducted under 27 scenarios incorporating multiple integrated representative concentration pathway models and population scenarios. We identify the type of magistral HVs host species as the best spatial division, including four region categories. Seven extreme climate indices associated with temperature and precipitation have been pinpointed as key factors affecting the trends of HFRS. Our predictions indicate that annual HFRS cases will increase significantly in 62 of 356 cities in mainland China. Rattus regions are predicted to be the most active, surpassing Apodemus and Mixed regions. Eighty cities are identified as at severe risk level for HFRS, each with over 50 reported cases annually, including 22 new cities primarily located in East China and Rattus regions after 2020, while 6 others develop new risk. Our results suggest that the risk of HFRS will remain high through the end of this century, with Rattus norvegicus being the most active host, and that extreme climate indices are significant risk factors. Our findings can inform evidence-based policymaking regarding future risk of HFRS.
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Affiliation(s)
- Yuchen Wang
- Vanke School of Public Health, Tsinghua University, Beijing100084, China
- Institute for Healthy China, Tsinghua University, Beijing100084, China
| | - Chutian Zhang
- Vanke School of Public Health, Tsinghua University, Beijing100084, China
- Institute for Healthy China, Tsinghua University, Beijing100084, China
- College of Natural Resources and Environment, Northwest A&F University, Yangling712100, China
| | - Jing Gao
- Vanke School of Public Health, Tsinghua University, Beijing100084, China
- Institute for Healthy China, Tsinghua University, Beijing100084, China
- Respiratory Medicine Unit, Department of Medicine & Centre for Molecular Medicine, Karolinska Institute, Stockholm171 77, Sweden
- Heart and Lung Centre, Department of Pulmonary Medicine, University of Helsinki and Helsinki University Hospital, Helsinki00290, Finland
| | - Ziqi Chen
- Vanke School of Public Health, Tsinghua University, Beijing100084, China
- Institute for Healthy China, Tsinghua University, Beijing100084, China
| | - Zhao Liu
- School of Linkong Economics and Management, Beijing Institute of Economics and Management, Beijing100102, China
| | - Jianbin Huang
- Beijing Yanshan Earth Critical Zone National Research Station, University of Chinese Academy of Sciences, Beijing101408, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing100190, China
| | - Yidan Chen
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Zhichao Li
- Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing100101, China
| | - Nan Chang
- School of Public Health, Nanjing Medical University, Nanjing210000, China
| | - Yuxin Tao
- Center for Statistical Science, Department of Industrial Engineering, Tsinghua University, Beijing100084, China
| | - Hui Tang
- Department of Geosciences, Natural History Museum, University of Oslo, Blindern, Oslo0316, Norway
- Natural History Museum, University of Oslo, Blindern, Oslo0316, Norway
- Department of Geosciences and Geography, University of Helsinki, Helsinki00014, Finland
| | - Xuejie Gao
- Climate Change Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing100029, China
- College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing100049, China
| | - Ying Xu
- National Climate Centre, China Meteorological Administration, Beijing100081, China
| | - Can Wang
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Dong Li
- Center for Statistical Science, Department of Industrial Engineering, Tsinghua University, Beijing100084, China
| | - Xiaobo Liu
- National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing102206, China
| | - Jingxiang Pan
- Joan & Sanford I. Weill Medical College, Cornell University, Ithaca, New York10065
| | - Wenjia Cai
- Department of Earth System Science, Ministry of Education Key Laboratory for Earth System Modelling, Institute for Global Change Studies, Tsinghua University, Beijing100084, China
| | - Peng Gong
- Department of Earth Sciences and Geography, University of Hong Kong, Hong Kong Special Administrative Region999077, China
| | - Yong Luo
- Department of Earth System Science, Ministry of Education Key Laboratory for Earth System Modelling, Institute for Global Change Studies, Tsinghua University, Beijing100084, China
| | - Wannian Liang
- Vanke School of Public Health, Tsinghua University, Beijing100084, China
- Institute for Healthy China, Tsinghua University, Beijing100084, China
| | - Qiyong Liu
- National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing102206, China
| | - Nils Chr. Stenseth
- Vanke School of Public Health, Tsinghua University, Beijing100084, China
- Centre for Pandemics and One-Health Research, Faculty of Medicine, University of Oslo, OsloN-0316, Norway
- Centre for Ecological and Evolutionary Synthesis, Department of Biosciences, Faculty of Mathematics and Natural Sciences, University of Oslo, OsloN-0315, Norway
| | - Ruifu Yang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing100071, China
| | - Lei Xu
- Vanke School of Public Health, Tsinghua University, Beijing100084, China
- Institute for Healthy China, Tsinghua University, Beijing100084, China
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3
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Baymiller M, Moon SL. Stress Granules as Causes and Consequences of Translation Suppression. Antioxid Redox Signal 2023; 39:390-409. [PMID: 37183403 PMCID: PMC10443205 DOI: 10.1089/ars.2022.0164] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 04/05/2023] [Accepted: 05/01/2023] [Indexed: 05/16/2023]
Abstract
Significance: Stress granules (SGs) are biomolecular condensates that form upon global translation suppression during stress. SGs are enriched in translation factors and messenger RNAs (mRNAs), which they may sequester away from the protein synthesis machinery. While this is hypothesized to remodel the functional transcriptome during stress, it remains unclear whether SGs are a cause, or simply a consequence, of translation repression. Understanding the function of SGs is particularly important because they are implicated in numerous diseases including viral infections, cancer, and neurodegeneration. Recent Advances: We synthesize recent SG research spanning biological scales, from observing single proteins and mRNAs within one cell to measurements of the entire transcriptome or proteome of SGs in a cell population. We use the emerging understanding from these studies to suggest that SGs likely have less impact on global translation, but instead may strongly influence the translation of individual mRNAs localized to them. Critical Issues: Development of a unified model that links stress-induced RNA-protein condensation to regulation of downstream gene expression holds promise for understanding the mechanisms of cellular resilience. Future Directions: Therefore, upcoming research should clarify what influence SGs exert on translation at all scales as well as the molecular mechanisms that enable this. The resulting knowledge will be required to drive discovery in how SGs allow organisms to adapt to challenges and support health or go awry and lead to disease. Antioxid. Redox Signal. 39, 390-409.
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Affiliation(s)
- Max Baymiller
- Department of Human Genetics, University of Michigan, Ann Arbor, Michigan, USA
- Center for RNA Biomedicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Stephanie L. Moon
- Department of Human Genetics, University of Michigan, Ann Arbor, Michigan, USA
- Center for RNA Biomedicine, University of Michigan, Ann Arbor, Michigan, USA
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4
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LaPointe A, Gale M, Kell AM. Orthohantavirus Replication in the Context of Innate Immunity. Viruses 2023; 15:1130. [PMID: 37243216 PMCID: PMC10220641 DOI: 10.3390/v15051130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 05/05/2023] [Accepted: 05/06/2023] [Indexed: 05/28/2023] Open
Abstract
Orthohantaviruses are rodent-borne, negative-sense RNA viruses that are capable of causing severe vascular disease in humans. Over the course of viral evolution, these viruses have tailored their replication cycles in such a way as to avoid and/or antagonize host innate immune responses. In the rodent reservoir, this results in life long asymptomatic infections. However, in hosts other than its co-evolved reservoir, the mechanisms for subduing the innate immune response may be less efficient or absent, potentially leading to disease and/or viral clearance. In the case of human orthohantavirus infection, the interaction of the innate immune response with viral replication is thought to give rise to severe vascular disease. The orthohantavirus field has made significant advancements in understanding how these viruses replicate and interact with host innate immune responses since their identification by Dr. Ho Wang Lee and colleagues in 1976. Therefore, the purpose of this review, as part of this special issue dedicated to Dr. Lee, was to summarize the current knowledge of orthohantavirus replication, how viral replication activates innate immunity, and how the host antiviral response, in turn, impacts viral replication.
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Affiliation(s)
- Autumn LaPointe
- Department of Molecular Genetics and Microbiology, University of New Mexico, 915 Camino de Salud NE, Albuquerque, NM 87131, USA
| | - Michael Gale
- Department of Immunology, Center for Innate Immunity and Immune Disease, University of Washington, Seattle, WA 98109, USA
| | - Alison M. Kell
- Department of Molecular Genetics and Microbiology, University of New Mexico, 915 Camino de Salud NE, Albuquerque, NM 87131, USA
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Menke L, Sperber HS, Aji AK, Chiantia S, Schwarzer R, Sieben C. Advances in fluorescence microscopy for orthohantavirus research. Microscopy (Oxf) 2023:6987530. [PMID: 36639937 DOI: 10.1093/jmicro/dfac075] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 11/30/2022] [Accepted: 01/12/2023] [Indexed: 01/15/2023] Open
Abstract
Orthohantaviruses are important zoonotic pathogens responsible for a considerable disease burden globally. Partly due to our incomplete understanding of orthohantavirus replication, there is currently no effective antiviral treatment available. Recently, novel microscopy techniques and cutting-edge, automated image analysis algorithms have emerged, enabling to study cellular, subcellular and even molecular processes in unprecedented detail and depth. To date, fluorescence light microscopy allows us to visualize viral and cellular components and macromolecular complexes in live cells which in turn enables the study of specific steps of the viral replication cycle such as particle entry or protein trafficking at high temporal and spatial resolution. In this review, we highlight how fluorescence microscopy has provided new insights and improved our understanding of orthohantavirus biology. We discuss technical challenges such as studying live infected cells, give alternatives with recombinant protein expression and highlight future opportunities for example the application of super-resolution microscopy techniques, which has shown great potential in studies of different cellular processes and viral pathogens.
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Affiliation(s)
- Laura Menke
- Nanoscale Infection Biology Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - Hannah S Sperber
- Institute for Translational HIV Research, University Hospital Essen, Essen, Germany
| | - Amit Koikkarah Aji
- University of Potsdam, Institute of Biochemistry and Biology, Department of Physical Biochemistry, Potsdam, Germany
| | - Salvatore Chiantia
- University of Potsdam, Institute of Biochemistry and Biology, Department of Physical Biochemistry, Potsdam, Germany
| | - Roland Schwarzer
- Institute for Translational HIV Research, University Hospital Essen, Essen, Germany
| | - Christian Sieben
- Nanoscale Infection Biology Helmholtz Centre for Infection Research, Braunschweig, Germany.,Institute of Genetics, Technische Universität Braunschweig, Braunschweig, Germany
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Gallo G, Kotlik P, Roingeard P, Monot M, Chevreux G, Ulrich RG, Tordo N, Ermonval M. Diverse susceptibilities and responses of human and rodent cells to orthohantavirus infection reveal different levels of cellular restriction. PLoS Negl Trop Dis 2022; 16:e0010844. [PMID: 36223391 PMCID: PMC9591050 DOI: 10.1371/journal.pntd.0010844] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 10/24/2022] [Accepted: 09/23/2022] [Indexed: 11/19/2022] Open
Abstract
Orthohantaviruses are rodent-borne emerging viruses that may cause severe diseases in humans but no apparent pathology in their small mammal reservoirs. However, the mechanisms leading to tolerance or pathogenicity in humans and persistence in rodent reservoirs are poorly understood, as is the manner in which they spread within and between organisms. Here, we used a range of cellular and molecular approaches to investigate the interactions of three different orthohantaviruses-Puumala virus (PUUV), responsible for a mild to moderate form of hemorrhagic fever with renal syndrome in humans, Tula virus (TULV) with low pathogenicity, and non-pathogenic Prospect Hill virus (PHV)-with human and rodent host cell lines. Besides the fact that cell susceptibility to virus infection was shown to depend on the cell type and virus strain, the three orthohantaviruses were able to infect Vero E6 and HuH7 human cells, but only the former secreted infectious particles. In cells derived from PUUV reservoir, the bank vole (Myodes glareolus), PUUV achieved a complete viral cycle, while TULV did not enter the cells and PHV infected them but did not produce infectious particles, reflecting differences in host specificity. A search for mature virions by electron microscopy (EM) revealed that TULV assembly occurred in part at the plasma membrane, whereas PHV particles were trapped in autophagic vacuoles in cells of the heterologous rodent host. We described differential interactions of orthohantaviruses with cellular factors, as supported by the cellular distribution of viral nucleocapsid protein with cell compartments, and proteomics identification of cellular partners. Our results also showed that interferon (IFN) dependent gene expression was regulated in a cell and virus species dependent manner. Overall, our study highlighted the complexity of the host-virus relationship and demonstrated that orthohantaviruses are restricted at different levels of the viral cycle. In addition, the study opens new avenues to further investigate how these viruses differ in their interactions with cells to evade innate immunity and how it depends on tissue type and host species.
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Affiliation(s)
- Giulia Gallo
- Institut Pasteur, Université Paris Cité, Département de Virologie, Unité des Stratégies Antivirales, Paris, France
- Sorbonne Université, Ecole Doctorale Complexité du Vivant, Paris, France
- * E-mail: (ME); (GG)
| | - Petr Kotlik
- Laboratory of Molecular Ecology, Institute of Animal Physiology and Genetics, Czech Academy of Sciences, Liběchov, Czech Republic
| | - Philippe Roingeard
- INSERM U1259 et plateforme IBISA de Microscopie Electronique, Université et CHRU de Tours, Tours, France
| | - Marc Monot
- Institut Pasteur, Université Paris Cité, Biomics Platform, C2RT, Paris, France
| | | | - Rainer G. Ulrich
- Institute of Novel and Emerging Infectious Diseases, Friedrich-Loeffler-Institut, Partner site Hamburg-Lübeck-Borstel-Riems, German Centre for Infection Research (DZIF), Greifswald-Insel Riems, Germany
| | - Noël Tordo
- Institut Pasteur, Université Paris Cité, Département de Virologie, Unité des Stratégies Antivirales, Paris, France
- Institut Pasteur de Guinée, Conakry, Guinée
| | - Myriam Ermonval
- Institut Pasteur, Université Paris Cité, Département de Virologie, Unité des Stratégies Antivirales, Paris, France
- * E-mail: (ME); (GG)
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Zhang Y, Ma R, Wang Y, Sun W, Yang Z, Han M, Han T, Wu XA, Liu R. Viruses Run: The Evasion Mechanisms of the Antiviral Innate Immunity by Hantavirus. Front Microbiol 2021; 12:759198. [PMID: 34659193 PMCID: PMC8516094 DOI: 10.3389/fmicb.2021.759198] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Accepted: 09/10/2021] [Indexed: 11/13/2022] Open
Abstract
Hantavirus can cause hemorrhagic fever with renal syndrome (HFRS) in Eurasia and hantavirus pulmonary syndrome (HPS) in America, with high mortality and unknown mechanisms. Innate immunity is the host's first-line defense to bridge the acquired immunity against viral infections. However, hantavirus has evolved various strategies in both molecular and cellular aspects to evade the host's natural immune surveillance. The Interferon-I (IFN-I) signaling pathway, a central link of host defense, induces various antiviral proteins to control the infection. This paper summarizes the molecular mechanisms of hantavirus evasion mechanisms of the IFN signaling pathway and cellular processes such as regulated cell death and cell stress. Besides, hantavirus could also evade immune surveillance evasion through cellular mechanisms, such as upregulating immune checkpoint molecules interfering with viral infections. Understanding hantavirus's antiviral immune evasion mechanisms will deepen our understanding of its pathogenesis and help us develop more effective methods to control and eliminate hantavirus.
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Affiliation(s)
- Yusi Zhang
- Department of Immunology, School of Basic Medicine, Fourth Military Medical University, Xi΄an, China
| | - Ruixue Ma
- Department of Microbiology, School of Basic Medicine, Fourth Military Medical University, Xi΄an, China
| | - Yutong Wang
- School of Basic Medicine, Fourth Military Medical University, Xi΄an, China
| | - Wenjie Sun
- Department of Microbiology, School of Basic Medicine, Fourth Military Medical University, Xi΄an, China
| | - Ziwei Yang
- Department of Microbiology, School of Basic Medicine, Fourth Military Medical University, Xi΄an, China
| | - Mingwei Han
- School of Basic Medicine, Fourth Military Medical University, Xi΄an, China
| | - Tixin Han
- School of Basic Medicine, Fourth Military Medical University, Xi΄an, China
| | - Xing-an Wu
- Department of Microbiology, School of Basic Medicine, Fourth Military Medical University, Xi΄an, China
| | - Rongrong Liu
- Department of Microbiology, School of Basic Medicine, Fourth Military Medical University, Xi΄an, China
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8
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Kell AM. Innate Immunity to Orthohantaviruses: Could Divergent Immune Interactions Explain Host-specific Disease Outcomes? J Mol Biol 2021; 434:167230. [PMID: 34487792 PMCID: PMC8894506 DOI: 10.1016/j.jmb.2021.167230] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 08/30/2021] [Accepted: 08/31/2021] [Indexed: 10/20/2022]
Abstract
The genus Orthohantavirus (family Hantaviridae, order Bunyavirales) consists of numerous genetic and pathologically distinct viral species found within rodent and mammalian insectivore populations world-wide. Although reservoir hosts experience persistent asymptomatic infection, numerous rodent-borne orthohantaviruses cause severe disease when transmitted to humans, with case-fatality rates up to 40%. The first isolation of an orthohantavirus occurred in 1976 and, since then, the field has made significant progress in understanding the immune correlates of disease, viral interactions with the human innate immune response, and the immune kinetics of reservoir hosts. Much still remains elusive regarding the molecular mechanisms of orthohantavirus recognition by the innate immune response and viral antagonism within the reservoir host, however. This review provides a summary of the last 45 years of research into orthohantavirus interaction with the host innate immune response. This summary includes discussion of current knowledge involving human, non-reservoir rodent, and reservoir innate immune responses to viruses which cause hemorrhagic fever with renal syndrome and hantavirus cardio-pulmonary syndrome. Review of the literature concludes with a brief proposition for the development of novel tools needed to drive forward investigations into the molecular mechanisms of innate immune activation and consequences for disease outcomes in the various hosts for orthohantaviruses.
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Affiliation(s)
- Alison M Kell
- Department of Molecular Genetics and Microbiology, University of New Mexico, 915 Camino de Salud, Albuquerque, NM 87131, United States.
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Saavedra F, Díaz FE, Retamal‐Díaz A, Covián C, González PA, Kalergis AM. Immune response during hantavirus diseases: implications for immunotherapies and vaccine design. Immunology 2021; 163:262-277. [PMID: 33638192 PMCID: PMC8207335 DOI: 10.1111/imm.13322] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 02/05/2021] [Accepted: 02/15/2021] [Indexed: 12/18/2022] Open
Abstract
Orthohantaviruses, previously named hantaviruses, cause two emerging zoonotic diseases: haemorrhagic fever with renal syndrome (HFRS) in Eurasia and hantavirus cardiopulmonary syndrome (HCPS) in the Americas. Overall, over 200 000 cases are registered every year worldwide, with a fatality rate ranging between 0·1% and 15% for HFRS and between 20% and 40% for HCPS. No specific treatment or vaccines have been approved by the U.S. Food and Drug Administration (FDA) to treat or prevent hantavirus-caused syndromes. Currently, little is known about the mechanisms at the basis of hantavirus-induced disease. However, it has been hypothesized that an excessive inflammatory response plays an essential role in the course of the disease. Furthermore, the contributions of the cellular immune response to either viral clearance or pathology have not been fully elucidated. This article discusses recent findings relative to the immune responses elicited to hantaviruses in subjects suffering HFRS or HCPS, highlighting the similarities and differences between these two clinical diseases. Also, we summarize the most recent data about the cellular immune response that could be important for designing new vaccines to prevent this global public health problem.
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Affiliation(s)
- Farides Saavedra
- Millennium Institute on Immunology and ImmunotherapyDepartamento de Genética Molecular y MicrobiologíaFacultad de Ciencias BiológicasPontificia Universidad Católica de ChileSantiagoChile
| | - Fabián E. Díaz
- Millennium Institute on Immunology and ImmunotherapyDepartamento de Genética Molecular y MicrobiologíaFacultad de Ciencias BiológicasPontificia Universidad Católica de ChileSantiagoChile
| | - Angello Retamal‐Díaz
- Millennium Institute on Immunology and ImmunotherapyDepartamento de Genética Molecular y MicrobiologíaFacultad de Ciencias BiológicasPontificia Universidad Católica de ChileSantiagoChile
| | - Camila Covián
- Millennium Institute on Immunology and ImmunotherapyDepartamento de Genética Molecular y MicrobiologíaFacultad de Ciencias BiológicasPontificia Universidad Católica de ChileSantiagoChile
| | - Pablo A. González
- Millennium Institute on Immunology and ImmunotherapyDepartamento de Genética Molecular y MicrobiologíaFacultad de Ciencias BiológicasPontificia Universidad Católica de ChileSantiagoChile
| | - Alexis M. Kalergis
- Millennium Institute on Immunology and ImmunotherapyDepartamento de Genética Molecular y MicrobiologíaFacultad de Ciencias BiológicasPontificia Universidad Católica de ChileSantiagoChile
- Millennium Institute on Immunology and ImmunotherapyDepartamento de EndocrinologíaFacultad de MedicinaEscuela de MedicinaPontificia Universidad Católica de ChileSantiagoChile
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Relevance of oxidative stress in inhibition of eIF2 alpha phosphorylation and stress granules formation during Usutu virus infection. PLoS Negl Trop Dis 2021; 15:e0009072. [PMID: 33493202 PMCID: PMC7861526 DOI: 10.1371/journal.pntd.0009072] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 02/04/2021] [Accepted: 12/14/2020] [Indexed: 12/12/2022] Open
Abstract
Usutu virus (USUV) is an African mosquito-borne flavivirus closely related to West Nile, Japanese encephalitis, Zika, and dengue viruses. USUV emerged in 1996 in Europe, where quickly spread across the continent causing a considerable number of bird deaths and varied neurological disorders in humans, including encephalitis, meningoencephalitis, or facial paralysis, thus warning about USUV as a potential health threat. USUV replication takes place on the endoplasmic reticulum (ER) of infected cells, inducing ER stress and resulting in the activation of stress-related cellular pathways collectively known as the integrated stress response (ISR). The alpha subunit of the eukaryotic initiation factor eIF2 (eIF2α), the core factor in this pathway, is phosphorylated by stress activated kinases: protein kinase R (PKR), PKR-like endoplasmic reticulum kinase (PERK), heme-regulated inhibitor kinase (HRI), and general control non-repressed 2 kinase (GCN2). Its phosphorylation results, among others, in the downstream inhibition of translation with accumulation of discrete foci in the cytoplasm termed stress granules (SGs). Our results indicated that USUV infection evades cellular stress response impairing eIF2α phosphorylation and SGs assembly induced by treatment with the HRI activator ArsNa. This protective effect was related with oxidative stress responses in USUV-infected cells. Overall, these results provide new insights into the complex connections between the stress response and flavivirus infection in order to maintain an adequate cellular environment for viral replication. Usutu virus (USUV) infection impairs eIF2α phosphorylation and SGs assembly, in an oxidative stress related manner, as a mechanism to evade cellular stress response. Our results provide new insights into the complex connections between the stress response and USUV infection to maintain a better cellular environment for viral replication.
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11
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Beauclair G, Streicher F, Chazal M, Bruni D, Lesage S, Gracias S, Bourgeau S, Sinigaglia L, Fujita T, Meurs EF, Tangy F, Jouvenet N. Retinoic Acid Inducible Gene I and Protein Kinase R, but Not Stress Granules, Mediate the Proinflammatory Response to Yellow Fever Virus. J Virol 2020; 94:e00403-20. [PMID: 32878892 PMCID: PMC7592215 DOI: 10.1128/jvi.00403-20] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Accepted: 08/27/2020] [Indexed: 12/21/2022] Open
Abstract
Yellow fever virus (YFV) is an RNA virus primarily targeting the liver. Severe YF cases are responsible for hemorrhagic fever, plausibly precipitated by excessive proinflammatory cytokine response. Pathogen recognition receptors (PRRs), such as the cytoplasmic retinoic acid inducible gene I (RIG-I)-like receptors (RLRs), and the viral RNA sensor protein kinase R (PKR), are known to initiate a proinflammatory response upon recognition of viral genomes. Here, we sought to reveal the main determinants responsible for the acute cytokine expression occurring in human hepatocytes following YFV infection. Using a RIG-I-defective human hepatoma cell line, we found that RIG-I largely contributes to cytokine secretion upon YFV infection. In infected RIG-I-proficient hepatoma cells, RIG-I was localized in stress granules. These granules are large aggregates of stalled translation preinitiation complexes known to concentrate RLRs and PKR and are so far recognized as hubs orchestrating RNA virus sensing. Stable knockdown of PKR in hepatoma cells revealed that PKR contributes to both stress granule formation and cytokine induction upon YFV infection. However, stress granule disruption did not affect the cytokine response to YFV infection, as assessed by small interfering RNA (siRNA)-knockdown-mediated inhibition of stress granule assembly. Finally, no viral RNA was detected in stress granules using a fluorescence in situ hybridization approach coupled with immunofluorescence. Our findings suggest that both RIG-I and PKR mediate proinflammatory cytokine induction in YFV-infected hepatocytes, in a stress granule-independent manner. Therefore, by showing the uncoupling of the cytokine response from the stress granule formation, our model challenges the current view in which stress granules are required for the mounting of the acute antiviral response.IMPORTANCE Yellow fever is a mosquito-borne acute hemorrhagic disease caused by yellow fever virus (YFV). The mechanisms responsible for its pathogenesis remain largely unknown, although increased inflammation has been linked to worsened outcome. YFV targets the liver, where it primarily infects hepatocytes. We found that two RNA-sensing proteins, RIG-I and PKR, participate in the induction of proinflammatory mediators in human hepatocytes infected with YFV. We show that YFV infection promotes the formation of cytoplasmic structures, termed stress granules, in a PKR- but not RIG-I-dependent manner. While stress granules were previously postulated to be essential platforms for immune activation, we found that they are not required for the production of proinflammatory mediators upon YFV infection. Collectively, our work uncovered molecular events triggered by the replication of YFV, which could prove instrumental in clarifying the pathogenesis of the disease, with possible repercussions for disease management.
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Affiliation(s)
| | - Felix Streicher
- Department of Virology, Institut Pasteur, UMR3569 CNRS, Paris, France
| | - Maxime Chazal
- Department of Virology, Institut Pasteur, UMR3569 CNRS, Paris, France
| | - Daniela Bruni
- Department of Virology, Institut Pasteur, UMR3569 CNRS, Paris, France
| | - Sarah Lesage
- Department of Virology, Institut Pasteur, UMR3569 CNRS, Paris, France
- Université de Paris, Paris, France
| | - Ségolène Gracias
- Department of Virology, Institut Pasteur, UMR3569 CNRS, Paris, France
| | - Salomé Bourgeau
- Department of Virology, Institut Pasteur, UMR3569 CNRS, Paris, France
| | - Laura Sinigaglia
- Department of Virology, Institut Pasteur, UMR3569 CNRS, Paris, France
| | - Takashi Fujita
- Department of Virus Research, Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto, Japan
| | - Eliane F Meurs
- Department of Virology, Institut Pasteur, UMR3569 CNRS, Paris, France
| | - Frédéric Tangy
- Department of Virology, Institut Pasteur, UMR3569 CNRS, Paris, France
| | - Nolwenn Jouvenet
- Department of Virology, Institut Pasteur, UMR3569 CNRS, Paris, France
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12
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Meeting report: Eleventh International Conference on Hantaviruses. Antiviral Res 2020; 176:104733. [PMID: 32068071 DOI: 10.1016/j.antiviral.2020.104733] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Accepted: 02/01/2020] [Indexed: 12/24/2022]
Abstract
The 2019 11th International Conference on Hantaviruses (ICH 2019) was organized by the International Society for Hantaviruses (ISH), and held on September 1-4, 2019, at the Irish College, in Leuven, Belgium. These ICHs have been held every three years since 1989. ICH 2019 was attended by 158 participants from 33 countries. The current report summarizes research presented on all aspects of hantavirology: ecology; pathogenesis and immune responses; virus phylogeny, replication and morphogenesis; epidemiology; vaccines, therapeutics and prevention; and clinical aspects and diagnosis.
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