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D’Aria S, Maquet C, Li S, Dhup S, Lepez A, Kohler A, Van Hée VF, Dadhich RK, Frenière M, Andris F, Nemazanyy I, Sonveaux P, Machiels B, Gillet L, Braun MY. Expression of the monocarboxylate transporter MCT1 is required for virus-specific mouse CD8 + T cell memory development. Proc Natl Acad Sci U S A 2024; 121:e2306763121. [PMID: 38498711 PMCID: PMC10990098 DOI: 10.1073/pnas.2306763121] [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: 05/04/2023] [Accepted: 01/29/2024] [Indexed: 03/20/2024] Open
Abstract
Lactate-proton symporter monocarboxylate transporter 1 (MCT1) facilitates lactic acid export from T cells. Here, we report that MCT1 is mandatory for the development of virus-specific CD8+ T cell memory. MCT1-deficient T cells were exposed to acute pneumovirus (pneumonia virus of mice, PVM) or persistent γ-herpesvirus (Murid herpesvirus 4, MuHV-4) infection. MCT1 was required for the expansion of virus-specific CD8+ T cells and the control of virus replication in the acute phase of infection. This situation prevented the subsequent development of virus-specific T cell memory, a necessary step in containing virus reactivation during γ-herpesvirus latency. Instead, persistent active infection drove virus-specific CD8+ T cells toward functional exhaustion, a phenotype typically seen in chronic viral infections. Mechanistically, MCT1 deficiency sequentially impaired lactic acid efflux from activated CD8+ T cells, caused an intracellular acidification inhibiting glycolysis, disrupted nucleotide synthesis in the upstream pentose phosphate pathway, and halted cell proliferation which, ultimately, promoted functional CD8+ T cell exhaustion instead of memory development. Taken together, our data demonstrate that MCT1 expression is mandatory for inducing T cell memory and controlling viral infection by CD8+ T cells.
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Affiliation(s)
- Stefania D’Aria
- Institute for Medical Immunology, Faculty of Medicine, Université libre de Bruxelles, Gosselies6041, Belgium
| | - Céline Maquet
- Immunology-Vaccinology, Department of Infectious and Parasitic Diseases, Faculty of Veterinary Medicine - Fundamental and Applied Research for Animals & Health Research Unit, University of Liège, Liège4000, Belgium
| | - Shuang Li
- Institute for Medical Immunology, Faculty of Medicine, Université libre de Bruxelles, Gosselies6041, Belgium
| | - Suveera Dhup
- Pole of Pharmacology, Institut de Recherche Expérimentale et Clinique, Université catholique de Louvain, Brussels1200, Belgium
| | - Anouk Lepez
- Immunobiology Laboratory, Faculty of Sciences, Université libre de Bruxelles, Gosselies6041, Belgium
| | - Arnaud Kohler
- Institute for Medical Immunology, Faculty of Medicine, Université libre de Bruxelles, Gosselies6041, Belgium
| | - Vincent F. Van Hée
- Pole of Pharmacology, Institut de Recherche Expérimentale et Clinique, Université catholique de Louvain, Brussels1200, Belgium
| | - Rajesh K. Dadhich
- Pole of Pharmacology, Institut de Recherche Expérimentale et Clinique, Université catholique de Louvain, Brussels1200, Belgium
| | - Marine Frenière
- Institute for Medical Immunology, Faculty of Medicine, Université libre de Bruxelles, Gosselies6041, Belgium
| | - Fabienne Andris
- Immunobiology Laboratory, Faculty of Sciences, Université libre de Bruxelles, Gosselies6041, Belgium
| | - Ivan Nemazanyy
- Plateforme d’étude du métabolisme, Institut Necker, Inserm US 24 - CNRS UMS 3633, Faculté de Médecine Paris Descartes, Paris75015, France
| | - Pierre Sonveaux
- WEL Research Institute, Welbio Department, Wavre1300, Belgium
| | - Bénédicte Machiels
- Immunology-Vaccinology, Department of Infectious and Parasitic Diseases, Faculty of Veterinary Medicine - Fundamental and Applied Research for Animals & Health Research Unit, University of Liège, Liège4000, Belgium
| | - Laurent Gillet
- Immunology-Vaccinology, Department of Infectious and Parasitic Diseases, Faculty of Veterinary Medicine - Fundamental and Applied Research for Animals & Health Research Unit, University of Liège, Liège4000, Belgium
| | - Michel Y. Braun
- Institute for Medical Immunology, Faculty of Medicine, Université libre de Bruxelles, Gosselies6041, Belgium
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2
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Wang Y, Tibbetts SA, Krug LT. Conquering the Host: Determinants of Pathogenesis Learned from Murine Gammaherpesvirus 68. Annu Rev Virol 2021; 8:349-371. [PMID: 34586873 PMCID: PMC9153731 DOI: 10.1146/annurev-virology-011921-082615] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Gammaherpesviruses are an important class of oncogenic pathogens that are exquisitely evolved to their respective hosts. As such, the human gammaherpesviruses Epstein-Barr virus (EBV) and Kaposi sarcoma herpesvirus (KSHV) do not naturally infect nonhuman primates or rodents. There is a clear need to fully explore mechanisms of gammaherpesvirus pathogenesis, host control, and immune evasion in the host. A gammaherpesvirus pathogen isolated from murid rodents was first reported in 1980; 40 years later, murine gammaherpesvirus 68 (MHV68, MuHV-4, γHV68) infection of laboratory mice is a well-established pathogenesis system recognized for its utility in applying state-of-the-art approaches to investigate virus-host interactions ranging from the whole host to the individual cell. Here, we highlight recent advancements in our understanding of the processes by which MHV68 colonizes the host and drives disease. Lessons that inform KSHV and EBV pathogenesis and provide future avenues for novel interventions against infection and virus-associated cancers are emphasized.
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Affiliation(s)
- Yiping Wang
- Department of Molecular Genetics and Microbiology, UF Health Cancer Center, College of Medicine, University of Florida, Gainesville, Florida 32610, USA
| | - Scott A Tibbetts
- Department of Molecular Genetics and Microbiology, UF Health Cancer Center, College of Medicine, University of Florida, Gainesville, Florida 32610, USA
| | - Laurie T Krug
- HIV and AIDS Malignancy Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA;
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3
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Erazo D, Pedersen AB, Gallagher K, Fenton A. Who acquires infection from whom? Estimating herpesvirus transmission rates between wild rodent host groups. Epidemics 2021; 35:100451. [PMID: 33761448 DOI: 10.1016/j.epidem.2021.100451] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 02/10/2021] [Accepted: 03/10/2021] [Indexed: 11/24/2022] Open
Abstract
To date, few studies of parasite epidemiology have investigated 'who acquires infection from whom' in wildlife populations. Nonetheless, identifying routes of disease transmission within a population, and determining the key groups of individuals that drive parasite transmission and maintenance, are fundamental to understanding disease dynamics. Gammaherpesviruses are a widespread group of DNA viruses that infect many vertebrate species, and murine gammaherpesviruses (i.e. MuHV-4) are a standard lab model for studying human herpesviruses, for which much about the pathology and immune response elicited to infection is well understood. However, despite this extensive research effort, primarily in the lab, the transmission route of murine gammaherpesviruses within their natural host populations is not well understood. Here, we aimed to understand wood mouse herpesvirus (WMHV) transmission, by fitting a series of population dynamic models to field data on wood mice naturally infected with WMHV and then estimating transmission parameters within and between demographic groups of the host population. Different models accounted for different combinations of host sex (male/female), age (subadult/adult) and transmission functions (density/frequency-dependent). We found that a density-dependent transmission model incorporating explicit sex groups fitted the data better than all other proposed models. Male-to-male transmission was the highest among all possible combinations of between- and within-sex transmission classes, suggesting that male behaviour is a key factor driving WMHV transmission. Our models also suggest that transmission between sexes, although important, wasn't symmetrical, with infected males playing a significant role in infecting naïve females but not vice versa. Overall this work shows the power of coupling population dynamic models with long-term field data to elucidate otherwise unobservable transmission processes in wild disease systems.
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Affiliation(s)
- Diana Erazo
- Institute of Infection, Veterinary, and Ecological Sciences, University of Liverpool, Liverpool, L69 7ZB, UK.
| | - Amy B Pedersen
- Institute of Evolutionary Biology & Centre for Infection, Immunity and Evolution, School of Biological Sciences, University of Edinburgh, Edinburgh, EH9 3FL, UK
| | - Kayleigh Gallagher
- Institute of Infection, Veterinary, and Ecological Sciences, University of Liverpool, Liverpool, L69 7ZB, UK
| | - Andy Fenton
- Institute of Infection, Veterinary, and Ecological Sciences, University of Liverpool, Liverpool, L69 7ZB, UK
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4
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Delguste M, Brun GL, Cotin F, Machiels B, Gillet L, Alsteens D. Single-Virus Force Spectroscopy Discriminates the Intrinsic Role of Two Viral Glycoproteins upon Cell Surface Attachment. NANO LETTERS 2021; 21:847-853. [PMID: 33373240 DOI: 10.1021/acs.nanolett.0c04609] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Viruses are one of the most efficient pathogenic entities on earth, resulting from millions of years of evolution. Each virus particle carries the minimum number of genes and proteins to ensure their reproduction within host cells, hijacking some host replication machinery. However, the role of some viral proteins is not yet unraveled, with some appearing even redundant. For example, murid herpesvirus 4, the current model for human gammaherpesvirus infection, can bind to cell surface glycosaminoglycans using both glycoproteins gp70 and gH/gL. Here, using atomic force microscopy, we discriminate their relative contribution during virus binding to cell surface glycosaminoglycans. Single-virus force spectroscopy experiments demonstrate that gH/gL is the main actor in glycosaminoglycan binding, engaging more numerous and more stable interactions. We also demonstrated that Fab antibody fragments targeting gH/gL or gp70 appear to be a promising treatment to prevent the attachment of virions to cell surfaces.
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Affiliation(s)
- Martin Delguste
- Université Catholique de Louvain, Louvain Institute of Biomolecular Science and Technology, Louvain-la-Neuve 1348, Belgium
| | - Grégoire Le Brun
- Université Catholique de Louvain, Louvain Institute of Biomolecular Science and Technology, Louvain-la-Neuve 1348, Belgium
| | - Florian Cotin
- Université Catholique de Louvain, Louvain Institute of Biomolecular Science and Technology, Louvain-la-Neuve 1348, Belgium
| | | | - Laurent Gillet
- University of Liège, Immunology-Vaccinology, FARAH, Liège 4000, Belgium
| | - David Alsteens
- Université Catholique de Louvain, Louvain Institute of Biomolecular Science and Technology, Louvain-la-Neuve 1348, Belgium
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5
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Dangerous Liaisons: Gammaherpesvirus Subversion of the Immunoglobulin Repertoire. Viruses 2020; 12:v12080788. [PMID: 32717815 PMCID: PMC7472090 DOI: 10.3390/v12080788] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 07/20/2020] [Accepted: 07/21/2020] [Indexed: 02/06/2023] Open
Abstract
A common biologic property of the gammaherpesviruses Epstein–Barr Virus and Kaposi sarcoma herpesvirus is their use of B lymphocytes as a reservoir of latency in healthy individuals that can undergo oncogenic transformation later in life. Gammaherpesviruses (GHVs) employ an impressive arsenal of proteins and non-coding RNAs to reprogram lymphocytes for proliferative expansion. Within lymphoid tissues, the germinal center (GC) reaction is a hub of B cell proliferation and death. The goal of a GC is to generate and then select for a pool of immunoglobulin (Ig) genes that will provide a protective humoral adaptive immune response. B cells infected with GHVs are detected in GCs and bear the hallmark signatures of the mutagenic processes of somatic hypermutation and isotype class switching of the Ig genes. However, data also supports extrafollicular B cells as a reservoir engaged by GHVs. Next-generation sequencing technologies provide unprecedented detail of the Ig sequence that informs the natural history of infection at the single cell level. Here, we review recent reports from human and murine GHV systems that identify striking differences in the immunoglobulin repertoire of infected B cells compared to their uninfected counterparts. Implications for virus biology, GHV-associated cancers, and host immune dysfunction will be discussed.
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6
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Delguste M, Zeippen C, Machiels B, Mast J, Gillet L, Alsteens D. Multivalent binding of herpesvirus to living cells is tightly regulated during infection. SCIENCE ADVANCES 2018; 4:eaat1273. [PMID: 30128355 PMCID: PMC6097811 DOI: 10.1126/sciadv.aat1273] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Accepted: 07/11/2018] [Indexed: 05/08/2023]
Abstract
Viral infection, initiated by the landing of a virion on a cellular surface, is largely defined by the preliminary interactions established between viral particles and their receptors at the cell surface. While multiple parallel interactions would allow strong virus attachment, a low number of bonds could be preferred to allow lateral diffusion toward specific receptors and to promote efficient release of progeny virions from the cell surface. However, so far, the molecular mechanisms underlying the regulation of the multivalency in virus attachment to receptors are poorly understood. We introduce a new method to force-probe multivalent attachment directly on living cells, and we show, for the first time, direct evidence of a new mechanism by which a herpesvirus surface glycoprotein acts as a key negative regulator in the first step of herpesvirus binding. Using atomic force microscopy, we probe at the single-virion level the number and the strength of the bonds established with heparan sulfate both on model surfaces and on living cells. Our biophysical results, correlated with other techniques, show that the major envelope glycoprotein functions as a regulator of binding valency during both attachment and release steps, determining the binding, diffusion, and release potential of virions at the cellular surface.
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Affiliation(s)
- Martin Delguste
- Louvain Institute of Biomolecular Science and Technology, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
| | - Caroline Zeippen
- Immunology-Vaccinology, Fundamental and Applied Research for Animals and Health Center (FARAH), University of Liège, 4000 Liège, Belgium
| | - Bénédicte Machiels
- Immunology-Vaccinology, Fundamental and Applied Research for Animals and Health Center (FARAH), University of Liège, 4000 Liège, Belgium
| | - Jan Mast
- Electron Microscopy Unit, Veterinary and Agrochemical Research Centre (CODA-CERVA), Brussels, Belgium
| | - Laurent Gillet
- Immunology-Vaccinology, Fundamental and Applied Research for Animals and Health Center (FARAH), University of Liège, 4000 Liège, Belgium
- Corresponding author. (L.G.); (D.A.)
| | - David Alsteens
- Louvain Institute of Biomolecular Science and Technology, Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium
- Corresponding author. (L.G.); (D.A.)
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7
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Torelli F, Zander S, Ellerbrok H, Kochs G, Ulrich RG, Klotz C, Seeber F. Recombinant IFN-γ from the bank vole Myodes glareolus: a novel tool for research on rodent reservoirs of zoonotic pathogens. Sci Rep 2018; 8:2797. [PMID: 29434310 PMCID: PMC5809609 DOI: 10.1038/s41598-018-21143-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Accepted: 01/25/2018] [Indexed: 12/28/2022] Open
Abstract
Rodent species like Myodes glareolus and Microtus spp. are natural reservoirs for many zoonotic pathogens causing human diseases and are gaining increasing interest in the field of eco-immunology as candidate animal models. Despite their importance the lack of immunological reagents has hampered research in these animal species. Here we report the recombinant production and functional characterization of IFN-γ, a central mediator of host’s innate and adaptive immune responses, from the bank vole M. glareolus. Soluble dimeric recMgIFN-γ was purified in high yield from Escherichia coli. Its activity on M. glareolus and Microtus arvalis kidney cell lines was assessed by immunofluorescent detection of nuclear translocation and phosphorylation of the transcription factor STAT1. RecMgIFN-γ also induced expression of an IFN-γ-regulated innate immunity gene. Inhibition of vesicular stomatitis virus replication in vole cells upon recMgIFN-γ treatment provided further evidence of its biological activity. Finally, we established a recMgIFN-γ-responsive bank vole reporter cell line that allows the sensitive titration of the cytokine activity via a bioluminescence reporter assay. Taken together, we report valuable tools for future investigations on the immune response against zoonotic pathogens in their natural animal hosts, which might foster the development of novel animal models.
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Affiliation(s)
- Francesca Torelli
- Department of Mycotic and Parasitic Agents and Mycobacteria, Robert Koch-Institut, Berlin, Germany
| | - Steffen Zander
- Department of Mycotic and Parasitic Agents and Mycobacteria, Robert Koch-Institut, Berlin, Germany
| | - Heinz Ellerbrok
- Center for Biological Threats and Special Pathogens, Highly Pathogenic Viruses, Robert Koch-Institut, Berlin, Germany
| | - Georg Kochs
- Institute of Virology, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Rainer G Ulrich
- Institute of Novel and Emerging Infectious Diseases, Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Greifswald-Insel Riems, Germany
| | - Christian Klotz
- Department of Mycotic and Parasitic Agents and Mycobacteria, Robert Koch-Institut, Berlin, Germany
| | - Frank Seeber
- Department of Mycotic and Parasitic Agents and Mycobacteria, Robert Koch-Institut, Berlin, Germany.
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8
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Hajnická V, Kúdelová M, Štibrániová I, Slovák M, Bartíková P, Halásová Z, Pančík P, Belvončíková P, Vrbová M, Holíková V, Hails RS, Nuttall PA. Tick-Borne Transmission of Murine Gammaherpesvirus 68. Front Cell Infect Microbiol 2017; 7:458. [PMID: 29164067 PMCID: PMC5674927 DOI: 10.3389/fcimb.2017.00458] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Accepted: 10/16/2017] [Indexed: 12/27/2022] Open
Abstract
Herpesviruses are a large group of DNA viruses infecting mainly vertebrates. Murine gammaherpesvirus 68 (MHV68) is often used as a model in studies of the pathogenesis of clinically important human gammaherpesviruses such as Epstein-Barr virus and Kaposi's sarcoma-associated herpesvirus. This rodent virus appears to be geographically widespread; however, its natural transmission cycle is unknown. Following detection of MHV68 in field-collected ticks, including isolation of the virus from tick salivary glands and ovaries, we investigated whether MHV68 is a tick-borne virus. Uninfected Ixodes ricinus ticks were shown to acquire the virus by feeding on experimentally infected laboratory mice. The virus survived tick molting, and the molted ticks transmitted the virus to uninfected laboratory mice on which they subsequently fed. MHV68 was isolated from the tick salivary glands, consistent with transmission via tick saliva. The virus survived in ticks without loss of infectivity for at least 120 days, and subsequently was transmitted vertically from one tick generation to the next, surviving more than 500 days. Furthermore, the F1 generation (derived from F0 infected females) transmitted MHV68 to uninfected mice on which they fed, with MHV68 M3 gene transcripts detected in blood, lung, and spleen tissue of mice on which F1 nymphs and F1 adults engorged. These experimental data fulfill the transmission criteria that define an arthropod-borne virus (arbovirus), the largest biological group of viruses. Currently, African swine fever virus (ASFV) is the only DNA virus recognized as an arbovirus. Like ASFV, MHV68 showed evidence of pathogenesis in ticks. Previous studies have reported MHV68 in free-living ticks and in mammals commonly infested with I. ricinus, and neutralizing antibodies to MHV68 have been detected in large mammals (e.g., deer) including humans. Further studies are needed to determine if these reports are the result of tick-borne transmission of MHV68 in nature, and whether humans are at risk of infection.
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Affiliation(s)
- Valeria Hajnická
- Biomedical Research Center, Institute of Virology, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Marcela Kúdelová
- Biomedical Research Center, Institute of Virology, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Iveta Štibrániová
- Biomedical Research Center, Institute of Virology, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Mirko Slovák
- Institute of Zoology, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Pavlína Bartíková
- Biomedical Research Center, Institute of Virology, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Zuzana Halásová
- Biomedical Research Center, Institute of Virology, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Peter Pančík
- Biomedical Research Center, Institute of Virology, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Petra Belvončíková
- Biomedical Research Center, Institute of Virology, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Michaela Vrbová
- Department of Microbiology and Virology, Comenius University, Bratislava, Slovakia
| | - Viera Holíková
- Biomedical Research Center, Institute of Virology, Slovak Academy of Sciences, Bratislava, Slovakia
| | | | - Patricia A Nuttall
- Centre for Ecology and Hydrology, Wallingford, United Kingdom.,Department of Zoology, University of Oxford, Oxford, United Kingdom
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9
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Development and application of a quantitative PCR assay to study equine herpesvirus 5 invasion and replication in equine tissues in vitro and in vivo. J Virol Methods 2017; 248:44-53. [PMID: 28455133 DOI: 10.1016/j.jviromet.2017.04.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Revised: 04/21/2017] [Accepted: 04/24/2017] [Indexed: 12/20/2022]
Abstract
Equine herpesvirus 5 (EHV-5) infection is associated with pulmonary fibrosis in horses, but further studies on EHV-5 persistence in equine cells are needed to fully understand viral and host contributions to disease pathogenesis. Our aim was to develop a quantitative PCR (qPCR) assay to measure EHV-5 viral copy number in equine cell cultures, blood lymphocytes, and nasal swabs of horses. Furthermore, we used a recently developed equine primary respiratory cell culture system to study EHV-5 pathogenesis at the respiratory tract. PCR primers and a probe were designed to target gene E11 of the EHV-5 genome. Sensitivity and repeatability were established, and specificity was verified by testing multiple isolates of EHV-5, as well as DNA from other equine herpesviruses. Four-week old fully differentiated (mature), newly seeded (immature) primary equine respiratory epithelial cell (ERECs), and equine dermal cell cultures were inoculated with EHV-5 and the cells and supernatants collected daily for 14days. Blood lymphocytes and nasal swabs were collected from horses experimentally infected with equine herpesvirus 1 (EHV-1). The qPCR assay detected EHV-5 at stable concentrations throughout 14days in inoculated mature EREC and equine dermal cell cultures (peaking at 202 and 5861 viral genomes per 106 cellular β actin, respectively). EHV-5 copies detected in the immature EREC cultures increased over 14days and reached levels greater than 10,000 viral genomes per 106 cellular β actin. Moreover, EHV-5 was detected in the lymphocytes of 76% of horses and in the nasal swabs of 84% of horses experimentally infected with EHV-1 pre-inoculation with EHV-1. Post-inoculation with EHV-1, EHV-5 was detected in lymphocytes of 52% of horses while EHV-5 levels in nasal swabs were not significantly different from pre-inoculation levels. In conclusion, qPCR was a reliable technique to investigate viral load in in vivo and in vitro samples, and EHV-5 replication in equine epithelial cells may be influenced by cellular stages of differentiation.
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10
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Deletion of Murid Herpesvirus 4 ORF63 Affects the Trafficking of Incoming Capsids toward the Nucleus. J Virol 2015; 90:2455-72. [PMID: 26676769 DOI: 10.1128/jvi.02942-15] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Accepted: 12/08/2015] [Indexed: 12/19/2022] Open
Abstract
UNLABELLED Gammaherpesviruses are important human and animal pathogens. Despite the fact that they display the classical architecture of herpesviruses, the function of most of their structural proteins is still poorly defined. This is especially true for tegument proteins. Interestingly, a potential role in immune evasion has recently been proposed for the tegument protein encoded by Kaposi's sarcoma-associated herpesvirus open reading frame 63 (ORF63). To gain insight about the roles of ORF63 in the life cycle of a gammaherpesvirus, we generated null mutations in the ORF63 gene of murid herpesvirus 4 (MuHV-4). We showed that disruption of ORF63 was associated with a severe MuHV-4 growth deficit both in vitro and in vivo. The latter deficit was mainly associated with a defect of replication in the lung but did not affect the establishment of latency in the spleen. From a functional point of view, inhibition of caspase-1 or the inflammasome did not restore the growth of the ORF63-deficient mutant, suggesting that the observed deficit was not associated with the immune evasion mechanism identified previously. Moreover, this growth deficit was also not associated with a defect in virion egress from the infected cells. In contrast, it appeared that MuHV-4 ORF63-deficient mutants failed to address most of their capsids to the nucleus during entry into the host cell, suggesting that ORF63 plays a role in capsid movement. In the future, ORF63 could therefore be considered a target to block gammaherpesvirus infection at a very early stage of the infection. IMPORTANCE The important diseases caused by gammaherpesviruses in human and animal populations justify a better understanding of their life cycle. In particular, the role of most of their tegument proteins is still largely unknown. In this study, we used murid herpesvirus 4, a gammaherpesvirus infecting mice, to decipher the role of the protein encoded by the viral ORF63 gene. We showed that the absence of this protein is associated with a severe growth deficit both in vitro and in vivo that was mainly due to impaired migration of viral capsids toward the nucleus during entry. Together, our results provide new insights about the life cycle of gammaherpesviruses and could allow the development of new antiviral strategies aimed at blocking gammaherpesvirus infection at the very early stages.
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11
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Gillet L, Frederico B, Stevenson PG. Host entry by gamma-herpesviruses--lessons from animal viruses? Curr Opin Virol 2015; 15:34-40. [PMID: 26246389 DOI: 10.1016/j.coviro.2015.07.007] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 07/13/2015] [Accepted: 07/14/2015] [Indexed: 12/15/2022]
Abstract
The oncogenicity of gamma-herpesviruses (γHVs) motivates efforts to control them and their persistence makes early events key targets for intervention. Human γHVs are often assumed to enter naive hosts orally and infect B cells directly. However, neither assumption is supported by direct evidence, and vaccination with the Epstein-Barr virus (EBV) gp350, to block virion binding to B cells, failed to reduce infection rates. Thus, there is a need to re-evaluate assumptions about γHV host entry. Given the difficulty of analysing early human infections, potentially much can be learned from animal models. Genomic comparisons argue that γHVs colonized mammals long before humans speciation, and so that human γHVs are unlikely to differ dramatically in behaviour from those of other mammals. Murid Herpesvirus-4 (MuHV-4), which like EBV and the Kaposi's Sarcoma-associated Herpesvirus (KSHV) persists in memory B cells, enters new hosts via olfactory neurons and exploits myeloid cells to spread. Integrating these data with existing knowledge of human and veterinary γHVs suggests a new model of host entry, with potentially important implications for infection control.
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Affiliation(s)
- Laurent Gillet
- Immunology/Vaccinology, Faculty of Veterinary Medicine, FARAH, University of Liège, Belgium.
| | - Bruno Frederico
- Cancer Research UK, Lincoln's Inn Fields, London, United Kingdom
| | - Philip G Stevenson
- Sir Albert Sakzewski Virus Research Centre, University of Queensland and Royal Children's Hospital, Brisbane, Australia
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12
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Frederico B, Chao B, Lawler C, May JS, Stevenson PG. Subcapsular sinus macrophages limit acute gammaherpesvirus dissemination. J Gen Virol 2015; 96:2314-2327. [PMID: 25872742 PMCID: PMC4681069 DOI: 10.1099/vir.0.000140] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Lymphocyte proliferation, mobility and longevity make them prime targets for virus infection. Myeloid cells that process and present environmental antigens to lymphocytes are consequently an important line of defence. Subcapsular sinus macrophages (SSMs) filter the afferent lymph and communicate with B-cells. How they interact with B-cell-tropic viruses is unknown. We analysed their encounter with murid herpesvirus-4 (MuHV-4), an experimentally accessible gammaherpesvirus related to Kaposi's sarcoma-associated herpesvirus. MuHV-4 disseminated via lymph nodes, and intranasally or subcutaneously inoculated virions readily infected SSMs. However, this infection was poorly productive. SSM depletion with clodronate-loaded liposomes or with diphtheria toxin in CD169–diphtheria toxin receptor transgenic mice increased B-cell infection and hastened virus spread to the spleen. Dendritic cells provided the main route to B-cells, and SSMs slowed host colonization, apparently by absorbing virions non-productively from the afferent lymph.
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Affiliation(s)
- Bruno Frederico
- Division of Virology, Department of Pathology, University of Cambridge, Cambridge, UK
| | - Brittany Chao
- Division of Virology, Department of Pathology, University of Cambridge, Cambridge, UK
| | - Clara Lawler
- Sir Albert Sakzewski Virus Research Centre, Clinical Medical Virology Centre, School of Chemistry and Molecular Biosciences, Royal Children's Hospital and University of Queensland, Brisbane, Australia
| | - Janet S May
- Division of Virology, Department of Pathology, University of Cambridge, Cambridge, UK
| | - Philip G Stevenson
- Division of Virology, Department of Pathology, University of Cambridge, Cambridge, UK.,Sir Albert Sakzewski Virus Research Centre, Clinical Medical Virology Centre, School of Chemistry and Molecular Biosciences, Royal Children's Hospital and University of Queensland, Brisbane, Australia
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Keebaugh ES, Schlenke TA. Insights from natural host-parasite interactions: the Drosophila model. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2014; 42:111-23. [PMID: 23764256 PMCID: PMC3808516 DOI: 10.1016/j.dci.2013.06.001] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2013] [Revised: 06/01/2013] [Accepted: 06/01/2013] [Indexed: 05/15/2023]
Abstract
Immune responses against opportunistic pathogens have been extensively studied in Drosophila, leading to a detailed map of the genetics behind innate immunity networks including the Toll, Imd, Jak-Stat, and JNK pathways. However, immune mechanisms of other organisms, such as plants, have primarily been investigated using natural pathogens. It was the use of natural pathogens in plant research that revealed the plant R-Avr system, a specialized immune response derived from antagonistic coevolution between plant immune proteins and their natural pathogens' virulence proteins. Thus, we recommend that researchers begin to use natural Drosophila pathogens to identify novel immune strategies that may have arisen through antagonistic coevolution with common natural pathogens. In this review, we address the benefits of using natural pathogens in research, describe the known natural pathogens of Drosophila, and discuss the future prospects for research on natural pathogens of Drosophila.
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Affiliation(s)
- Erin S Keebaugh
- Department of Biology, Emory University, 1510 Clifton Road, Atlanta, GA, United States.
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Vidick S, Leroy B, Palmeira L, Machiels B, Mast J, François S, Wattiez R, Vanderplasschen A, Gillet L. Proteomic characterization of murid herpesvirus 4 extracellular virions. PLoS One 2013; 8:e83842. [PMID: 24386290 PMCID: PMC3875534 DOI: 10.1371/journal.pone.0083842] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Accepted: 11/18/2013] [Indexed: 12/18/2022] Open
Abstract
Gammaherpesvirinae, such as the human Epstein-Barr virus (EBV) and the Kaposi’s sarcoma associated herpesvirus (KSHV) are highly prevalent pathogens that have been associated with several neoplastic diseases. As EBV and KSHV are host-range specific and replicate poorly in vitro, animal counterparts such as Murid herpesvirus-4 (MuHV-4) have been widely used as models. In this study, we used MuHV-4 in order to improve the knowledge about proteins that compose gammaherpesviruses virions. To this end, MuHV-4 extracellular virions were isolated and structural proteins were identified using liquid chromatography tandem mass spectrometry-based proteomic approaches. These analyses allowed the identification of 31 structural proteins encoded by the MuHV-4 genome which were classified as capsid (8), envelope (9), tegument (13) and unclassified (1) structural proteins. In addition, we estimated the relative abundance of the identified proteins in MuHV-4 virions by using exponentially modified protein abundance index analyses. In parallel, several host proteins were found in purified MuHV-4 virions including Annexin A2. Although Annexin A2 has previously been detected in different virions from various families, its role in the virion remains controversial. Interestingly, despite its relatively high abundance in virions, Annexin A2 was not essential for the growth of MuHV-4 in vitro. Altogether, these results extend previous work aimed at determining the composition of gammaherpesvirus virions and provide novel insights for understanding MuHV-4 biology.
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Affiliation(s)
- Sarah Vidick
- Department of Infectious Diseases, Faculty of Veterinary Medicine, University of Liège, Liège, Belgium
| | - Baptiste Leroy
- Department of Proteomics and Microbiology, Research Institute for Biosciences Interdisciplinary Mass Spectrometry Center (CISMa), University of Mons, Mons, Belgium
| | - Leonor Palmeira
- Department of Infectious Diseases, Faculty of Veterinary Medicine, University of Liège, Liège, Belgium
| | - Bénédicte Machiels
- Department of Infectious Diseases, Faculty of Veterinary Medicine, University of Liège, Liège, Belgium
| | - Jan Mast
- Electron Microscopy Unit, Veterinary and Agrochemical Research Centre, Brussels, Belgium
| | - Sylvie François
- Department of Infectious Diseases, Faculty of Veterinary Medicine, University of Liège, Liège, Belgium
| | - Ruddy Wattiez
- Department of Proteomics and Microbiology, Research Institute for Biosciences Interdisciplinary Mass Spectrometry Center (CISMa), University of Mons, Mons, Belgium
| | - Alain Vanderplasschen
- Department of Infectious Diseases, Faculty of Veterinary Medicine, University of Liège, Liège, Belgium
| | - Laurent Gillet
- Department of Infectious Diseases, Faculty of Veterinary Medicine, University of Liège, Liège, Belgium
- * E-mail:
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15
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Trammell RA, Verhulst S, Toth LA. Environmental perturbation, inflammation and behavior in healthy and virus-infected mice. Brain Behav Immun 2013; 33:139-52. [PMID: 23867134 DOI: 10.1016/j.bbi.2013.07.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Revised: 07/06/2013] [Accepted: 07/07/2013] [Indexed: 10/26/2022] Open
Abstract
The development of so-called "sickness behaviors" (e.g., anorexia, anhedonia, reduced social interaction, fatigue) during infectious and inflammatory disease has been linked to facets of the immune response. Such problems can be particularly troublesome during chronic latent infection, as the host immune system must employ continual vigilance to maintain viral latency. Epstein-Barr virus (EBV) is a ubiquitous human gamma-herpesvirus that causes acute disease and establishes life-long latency in people. Murine gammaherpesvirus (MuGHV) is a natural pathogen of wild rodents that provides an experimental model for studying the pathophysiology of an EBV-like gamma-herpesvirus in mice. To evaluate this model with regard to sickness behavior and its exacerbation during a chronic latent viral disease, we exposed uninfected and MuGHV-infected C57BL/6J and BALB/cByJ mice to novel and potentially stressful environmental perturbations and measured the impact of these challenges on behavior and markers of inflammation. The data indicate that exposure of mice to environmental perturbations during the normal somnolent phase is associated with reduced activity during the subsequent active phase, despite an intervening rest period. Effects on inflammatory mediators were complex due to independent and interactive effects of infection status, mouse strain, and exposure to stressful environment. However, GCSF and MCP1 were consistently elevated in lung both immediately after and 12h after exposure to a "dirty" cage containing the resident mouse (DCR); this increase occurred in both C57BL/6J and BALB/cByJ mice and was independent of infection status. At 12h after DCR, IL1β and IP10 were also consistently elevated in lung. In response to DCR, BALB/cByJ mice showed a greater number of significant cytokine effects than did C57BL/6J mice. With regard to infection status, IP10 was consistently elevated in lung at both time points regardless of mouse strain or DCR exposure. Several analytes were affected by mouse strain in serum or lung at one or both time points, with most strain differences present in serum at E18. Taken together, the data show that exposure of mice to environmental perturbations is associated with systemic inflammation that is in part independent of genetic background or latent MuGHV infection and with reduced activity that could represent fatigue, depression, or other facets of sickness behavior.
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Affiliation(s)
- Rita A Trammell
- Department of Internal Medicine, Southern Illinois University School of Medicine, United States
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François S, Vidick S, Sarlet M, Desmecht D, Drion P, Stevenson PG, Vanderplasschen A, Gillet L. Illumination of murine gammaherpesvirus-68 cycle reveals a sexual transmission route from females to males in laboratory mice. PLoS Pathog 2013; 9:e1003292. [PMID: 23593002 PMCID: PMC3616973 DOI: 10.1371/journal.ppat.1003292] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2012] [Accepted: 02/22/2013] [Indexed: 12/11/2022] Open
Abstract
Transmission is a matter of life or death for pathogen lineages and can therefore be considered as the main motor of their evolution. Gammaherpesviruses are archetypal pathogenic persistent viruses which have evolved to be transmitted in presence of specific immune response. Identifying their mode of transmission and their mechanisms of immune evasion is therefore essential to develop prophylactic and therapeutic strategies against these infections. As the known human gammaherpesviruses, Epstein-Barr virus and Kaposi's Sarcoma-associated Herpesvirus are host-specific and lack a convenient in vivo infection model; related animal gammaherpesviruses, such as murine gammaherpesvirus-68 (MHV-68), are commonly used as general models of gammaherpesvirus infections in vivo. To date, it has however never been possible to monitor viral excretion or virus transmission of MHV-68 in laboratory mice population. In this study, we have used MHV-68 associated with global luciferase imaging to investigate potential excretion sites of this virus in laboratory mice. This allowed us to identify a genital excretion site of MHV-68 following intranasal infection and latency establishment in female mice. This excretion occurred at the external border of the vagina and was dependent on the presence of estrogens. However, MHV-68 vaginal excretion was not associated with vertical transmission to the litter or with horizontal transmission to female mice. In contrast, we observed efficient virus transmission to naïve males after sexual contact. In vivo imaging allowed us to show that MHV-68 firstly replicated in penis epithelium and corpus cavernosum before spreading to draining lymph nodes and spleen. All together, those results revealed the first experimental transmission model for MHV-68 in laboratory mice. In the future, this model could help us to better understand the biology of gammaherpesviruses and could also allow the development of strategies that could prevent the spread of these viruses in natural populations. Epstein-Barr virus and the Kaposi's Sarcoma-associated Herpesvirus are two human gammaherpesviruses which are linked to the development of several cancers. Efficient control of these infections is therefore of major interest, particularly in some epidemiological circumstances. These viruses are however host-specific and cannot be experimentally studied in vivo. The identification of a closely related viral species, called Murid herpesvirus 4 with the main strain called murine gammaherpesvirus-68 (MHV-68), in wild rodents opened new horizons to the study of gammaherpesvirus biology. Surprisingly, despite 30 years of research, MHV-68 transmission had never been observed in captivity. In this study, using in vivo imaging, we showed that MHV-68 is genitally excreted after latency establishment in intranasally infected female mice. This allowed us to observe, for the first time, sexual transmission of MHV-68 between laboratory mice. In the future, this model should be important to better understand the biology of gammaherpesviruses and should also allow the development of strategies that could prevent the spread of these viruses in natural populations.
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Affiliation(s)
- Sylvie François
- Immunology-Vaccinology (B43b), Department of Infectious and Parasitic Diseases, Faculty of Veterinary Medicine, University of Liège, Liège, Belgium
| | - Sarah Vidick
- Immunology-Vaccinology (B43b), Department of Infectious and Parasitic Diseases, Faculty of Veterinary Medicine, University of Liège, Liège, Belgium
| | - Mickaël Sarlet
- Pathology (B43), Department of Morphology and Pathology, Faculty of Veterinary Medicine, University of Liège, Liège, Belgium
| | - Daniel Desmecht
- Pathology (B43), Department of Morphology and Pathology, Faculty of Veterinary Medicine, University of Liège, Liège, Belgium
| | - Pierre Drion
- Animal Facility (B23), GIGA-University of Liège, Liège, Belgium
| | - Philip G. Stevenson
- Division of Virology, Department of Pathology, University of Cambridge, Cambridge, United Kingdom
| | - Alain Vanderplasschen
- Immunology-Vaccinology (B43b), Department of Infectious and Parasitic Diseases, Faculty of Veterinary Medicine, University of Liège, Liège, Belgium
| | - Laurent Gillet
- Immunology-Vaccinology (B43b), Department of Infectious and Parasitic Diseases, Faculty of Veterinary Medicine, University of Liège, Liège, Belgium
- * E-mail:
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17
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Knowles SCL, Fenton A, Pedersen AB. Epidemiology and fitness effects of wood mouse herpesvirus in a natural host population. J Gen Virol 2012; 93:2447-2456. [PMID: 22915692 PMCID: PMC3542127 DOI: 10.1099/vir.0.044826-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Accepted: 08/16/2012] [Indexed: 11/18/2022] Open
Abstract
Rodent gammaherpesviruses have become important models for understanding human herpesvirus diseases. In particular, interactions between murid herpesvirus 4 and Mus musculus (a non-natural host species) have been extensively studied under controlled laboratory conditions. However, several fundamental aspects of murine gammaherpesvirus biology are not well understood, including how these viruses are transmitted from host to host, and their impacts on host fitness under natural conditions. Here, we investigate the epidemiology of a gammaherpesvirus in free-living wood mice (Apodemus sylvaticus) and bank voles (Myodes glareolus) in a 2-year longitudinal study. Wood mouse herpesvirus (WMHV) was the only herpesvirus detected and occurred frequently in wood mice and also less commonly in bank voles. Strikingly, WMHV infection probability was highest in reproductively active, heavy male mice. Infection risk also showed a repeatable seasonal pattern, peaking in spring and declining through the summer. We show that this seasonal decline can be at least partly attributed to reduced recapture of WMHV-infected adults. These results suggest that male reproductive behaviours could provide an important natural route of transmission for these viruses. They also suggest that gammaherpesvirus infection may have significant detrimental effects in wild hosts, questioning the view that these viruses have limited impacts in natural, co-evolved host species.
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Affiliation(s)
- Sarah C. L. Knowles
- Centre for Immunity, Infection and Evolution (CIIE), Institute of Evolutionary Biology, School of Biological Sciences, The University of Edinburgh, West Mains Road, Edinburgh, EH9 3JT, UK
| | - Andy Fenton
- Institute of Integrative Biology, University of Liverpool, Biosciences Building, Crown Street, Liverpool, L69 7ZB, UK
| | - Amy B. Pedersen
- Centre for Immunity, Infection and Evolution (CIIE), Institute of Evolutionary Biology, School of Biological Sciences, The University of Edinburgh, West Mains Road, Edinburgh, EH9 3JT, UK
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18
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Ward CJK. Conference scene: Understanding pathogen evasion of host immunity. Immunotherapy 2012; 4:879-81. [PMID: 23046231 DOI: 10.2217/imt.12.86] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This novel conference organized by EuroSciCon hosted scientists from across Europe with research interests varying in pathogen type and branch of immunology. The conference was intentionally convened to promote cross-disciplinary discussion and interaction among immunologists differing in research background. The day involved several talks in addition to a question and answer session chaired by an expert panel, allowing researchers to discuss and integrate their diverse interests and findings in a novel forum. This report highlights topical research in bacterial, viral, fungal and parasitic interactions with host immunity.
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Hughes DJ, Kipar A, Leeming G, Sample JT, Stewart JP. Experimental infection of laboratory-bred bank voles (Myodes glareolus) with murid herpesvirus 4. Arch Virol 2012; 157:2207-12. [PMID: 22782137 DOI: 10.1007/s00705-012-1397-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2012] [Accepted: 05/21/2012] [Indexed: 11/26/2022]
Abstract
MuHV-4 is a natural pathogen of rodents of the genus Apodemus (e.g., wood mice, yellow-necked mice) and Myodes glareolus (bank voles). We report experimental MuHV-4 infection of bank voles in comparison with infection of A. sylvaticus (wood mice) and BALB/c mice. Like in wood mice, the level of productive replication in the lungs of bank voles was significantly lower than in BALB/c mice. In contrast to other hosts, however, the level of latent infection in the lung and spleen of bank voles was extremely low. These findings, together with those of previous studies, suggest that bank voles are an occasional and inefficient host for MuHV-4.
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Affiliation(s)
- David J Hughes
- Department of Infection Biology, University of Liverpool, Liverpool L69 7ZJ, UK
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Abstract
Viral infections of laboratory mice have considerable impact on research results, and prevention of such infections is therefore of crucial importance. This chapter covers infections of mice with the following viruses: herpesviruses, mousepox virus, murine adenoviruses, polyomaviruses, parvoviruses, lactate dehydrogenase-elevating virus, lymphocytic choriomeningitis virus, mammalian orthoreovirus serotype 3, murine hepatitis virus, murine norovirus, murine pneumonia virus, murine rotavirus, Sendai virus, and Theiler’s murine encephalomyelitis virus. For each virus, there is a description of the agent, epizootiology, clinical symptoms, pathology, methods of diagnosis and control, and its impact on research.
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Hughes DJ, Kipar A, Leeming GH, Bennett E, Howarth D, Cummerson JA, Papoula-Pereira R, Flanagan BF, Sample JT, Stewart JP. Chemokine binding protein M3 of murine gammaherpesvirus 68 modulates the host response to infection in a natural host. PLoS Pathog 2011; 7:e1001321. [PMID: 21445235 PMCID: PMC3060169 DOI: 10.1371/journal.ppat.1001321] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2009] [Accepted: 02/16/2011] [Indexed: 12/15/2022] Open
Abstract
Murine γ-herpesvirus 68 (MHV-68) infection of Mus musculus-derived strains of mice is an attractive model of γ-herpesvirus infection. Surprisingly, however, ablation of expression of MHV-68 M3, a secreted protein with broad chemokine-binding properties in vitro, has no discernable effect during experimental infection via the respiratory tract. Here we demonstrate that M3 indeed contributes significantly to MHV-68 infection, but only in the context of a natural host, the wood mouse (Apodemus sylvaticus). Specifically, M3 was essential for two features unique to the wood mouse: virus-dependent inducible bronchus-associated lymphoid tissue (iBALT) in the lung and highly organized secondary follicles in the spleen, both predominant sites of latency in these organs. Consequently, lack of M3 resulted in substantially reduced latency in the spleen and lung. In the absence of M3, splenic germinal centers appeared as previously described for MHV-68-infected laboratory strains of mice, further evidence that M3 is not fully functional in the established model host. Finally, analyses of M3's influence on chemokine and cytokine levels within the lungs of infected wood mice were consistent with the known chemokine-binding profile of M3, and revealed additional influences that provide further insight into its role in MHV-68 biology. Infection of inbred strains of laboratory mice (Mus musculus) with the rodent γ-herpesvirus MHV-68 continues to be developed as an attractive experimental model of γ-herpesvirus infection. In this regard, the MHV-68 protein M3 has been shown to selectively bind and inhibit chemokines involved in the antiviral immune response, a property expected to contribute significantly to virus infection and host colonization. However, inactivation of the M3 gene has no discernable consequence on infection in this animal host. Prompted by recent evidence that natural hosts of MHV-68 are members of the genus Apodemus, and that MHV-68 infection in laboratory-bred wood mice (Apodemus sylvaticus) differs significantly from that which has been described in standard strains of laboratory mice, we addressed whether M3 functions in a host-specific manner. Indeed, we find that M3 is responsible for host-specific differences observed for MHV-68 infection, that its influence on infection within wood mice is consistent with its chemokine-binding properties, and that in its absence, persistent latent infection - a hallmark of herpesvirus infections - is attenuated. This highlights the importance of host selection when investigating specific roles of pathogenesis-related viral genes, and advances our understanding of this model and its potential application to human γ-herpesvirus infections.
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Affiliation(s)
- David J. Hughes
- School of Infection and Host Defence, The University of Liverpool, Liverpool, United Kingdom
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, United States of America
| | - Anja Kipar
- Veterinary Pathology, School of Veterinary Science, The University of Liverpool, Liverpool, United Kingdom
| | - Gail H. Leeming
- Veterinary Pathology, School of Veterinary Science, The University of Liverpool, Liverpool, United Kingdom
| | - Elaine Bennett
- School of Infection and Host Defence, The University of Liverpool, Liverpool, United Kingdom
| | - Deborah Howarth
- School of Infection and Host Defence, The University of Liverpool, Liverpool, United Kingdom
| | - Joanne A. Cummerson
- School of Infection and Host Defence, The University of Liverpool, Liverpool, United Kingdom
| | - Rita Papoula-Pereira
- Veterinary Pathology, School of Veterinary Science, The University of Liverpool, Liverpool, United Kingdom
| | - Brian F. Flanagan
- School of Infection and Host Defence, The University of Liverpool, Liverpool, United Kingdom
| | - Jeffery T. Sample
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, United States of America
| | - James P. Stewart
- School of Infection and Host Defence, The University of Liverpool, Liverpool, United Kingdom
- * E-mail:
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