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Ganges L, Crooke HR, Bohórquez JA, Postel A, Sakoda Y, Becher P, Ruggli N. Classical swine fever virus: the past, present and future. Virus Res 2020; 289:198151. [PMID: 32898613 DOI: 10.1016/j.virusres.2020.198151] [Citation(s) in RCA: 86] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 08/24/2020] [Accepted: 08/28/2020] [Indexed: 12/22/2022]
Abstract
Classical swine fever (CSF) is among the most relevant viral epizootic diseases of swine. Due to its severe economic impact, CSF is notifiable to the world organisation for animal health. Strict control policies, including systematic stamping out of infected herds with and without vaccination, have permitted regional virus eradication. Nevertheless, CSF virus (CSFV) persists in certain areas of the world and has re-emerged regularly. This review summarizes the basic established knowledge in the field and provides a comprehensive and updated overview of the recent advances in fundamental CSFV research, diagnostics and vaccine development. It covers the latest discoveries on the genetic diversity of pestiviruses, with implications for taxonomy, the progress in understanding disease pathogenesis, immunity against acute and persistent infections, and the recent findings in virus-host interactions and virulence determinants. We also review the progress and pitfalls in the improvement of diagnostic tools and the challenges in the development of modern and efficacious marker vaccines compatible with serological tests for disease surveillance. Finally, we highlight the gaps that require research efforts in the future.
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Affiliation(s)
- Llilianne Ganges
- OIE Reference Laboratory for Classical Swine Fever, Institute of Agrifood Research and Technology, Centre de Recerca en Sanitat Animal (CReSA), 08193 Barcelona, Spain.
| | - Helen R Crooke
- Virology Department, Animal and Plant Health Agency, APHA-Weybridge, Woodham Lane, New Haw, Addlestone, KT15 3NB, UK
| | - Jose Alejandro Bohórquez
- OIE Reference Laboratory for Classical Swine Fever, Institute of Agrifood Research and Technology, Centre de Recerca en Sanitat Animal (CReSA), 08193 Barcelona, Spain
| | - Alexander Postel
- EU & OIE Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine, Hannover, Buenteweg 17, 30559 Hannover, Germany
| | - Yoshihiro Sakoda
- Laboratory of Microbiology, Faculty of Veterinary Medicine, Hokkaido University, Kita 18 Nishi 9, Kita-ku, Sapporo, 060-0818, Japan
| | - Paul Becher
- EU & OIE Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine, Hannover, Buenteweg 17, 30559 Hannover, Germany
| | - Nicolas Ruggli
- The Institute of Virology and Immunology IVI, Mittelhäusern, Switzerland; Department of Infectious Diseases and Pathobiology, University of Bern, Bern, Switzerland
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Porcine Dendritic Cells and Viruses: An Update. Viruses 2019; 11:v11050445. [PMID: 31100880 PMCID: PMC6563313 DOI: 10.3390/v11050445] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 05/12/2019] [Accepted: 05/14/2019] [Indexed: 12/13/2022] Open
Abstract
Several viral infections of swine are responsible for major economic losses and represent a threat to the swine industry worldwide. New tools are needed to prevent and control endemic, emerging, and re-emerging viral diseases. Dendritic cells (DC) play a central role in linking the innate and adaptive arms of the immune system, so knowledge regarding their interaction with pathogens is necessary to understand the mechanisms underlying diseases pathogenesis and protection. In the first part of this review, we provide an update on the heterogeneous cell subsets that comprise the porcine DC family. In the second part of this review, we provide an overview of how three viruses, affecting pork production at a global level, African swine fever virus (ASFV), classical swine fever virus (CSFV), and porcine circovirus 2 (PCV2), modulate DC function.
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Goraya MU, Ziaghum F, Chen S, Raza A, Chen Y, Chi X. Role of innate immunity in pathophysiology of classical swine fever virus infection. Microb Pathog 2018; 119:248-254. [DOI: 10.1016/j.micpath.2018.04.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2018] [Revised: 04/02/2018] [Accepted: 04/11/2018] [Indexed: 12/25/2022]
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Muñoz-González S, Pérez-Simó M, Colom-Cadena A, Cabezón O, Bohórquez JA, Rosell R, Pérez LJ, Marco I, Lavín S, Domingo M, Ganges L. Classical Swine Fever Virus vs. Classical Swine Fever Virus: The Superinfection Exclusion Phenomenon in Experimentally Infected Wild Boar. PLoS One 2016; 11:e0149469. [PMID: 26919741 PMCID: PMC4768946 DOI: 10.1371/journal.pone.0149469] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 01/31/2016] [Indexed: 12/02/2022] Open
Abstract
Two groups with three wild boars each were used: Group A (animals 1 to 3) served as the control, and Group B (animals 4 to 6) was postnatally persistently infected with the Cat01 strain of CSFV (primary virus). The animals, six weeks old and clinically healthy, were inoculated with the virulent strain Margarita (secondary virus). For exclusive detection of the Margarita strain, a specific qRT-PCR assay was designed, which proved not to have cross-reactivity with the Cat01 strain. The wild boars persistently infected with CSFV were protected from superinfection by the virulent CSFV Margarita strain, as evidenced by the absence of clinical signs and the absence of Margarita RNA detection in serum, swabs and tissue samples. Additionally, in PBMCs, a well-known target for CSFV viral replication, only the primary infecting virus RNA (Cat01 strain) could be detected, even after the isolation in ST cells, demonstrating SIE at the tissue level in vivo. Furthermore, the data analysis of the Margarita qRT-PCR, by means of calculated ΔCt values, supported that PBMCs from persistently infected animals were substantially protected from superinfection after in vitro inoculation with the Margarita virus strain, while this virus was able to infect naive PBMCs efficiently. In parallel, IFN-α values were undetectable in the sera from animals in Group B after inoculation with the CSFV Margarita strain. Furthermore, these animals were unable to elicit adaptive humoral (no E2-specific or neutralising antibodies) or cellular immune responses (in terms of IFN-γ-producing cells) after inoculation with the second virus. Finally, a sequence analysis could not detect CSFV Margarita RNA in the samples tested from Group B. Our results suggested that the SIE phenomenon might be involved in the evolution and phylogeny of the virus, as well as in CSFV control by vaccination. To the best of our knowledge, this study was one of the first showing efficient suppression of superinfection in animals, especially in the absence of IFN-α, which might be associated with the lack of innate immune mechanisms.
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Affiliation(s)
- Sara Muñoz-González
- IRTA, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus de la Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
| | - Marta Pérez-Simó
- IRTA, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus de la Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
| | - Andreu Colom-Cadena
- IRTA, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus de la Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
- Servei d'Ecopatologia de Fauna Salvatge, Departament de Medicina i Cirurgia Animals, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
| | - Oscar Cabezón
- IRTA, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus de la Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
- Servei d'Ecopatologia de Fauna Salvatge, Departament de Medicina i Cirurgia Animals, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
| | - José Alejandro Bohórquez
- IRTA, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus de la Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
| | - Rosa Rosell
- IRTA, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus de la Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
- Departament d’Agricultura, Ramaderia, Pesca, Alimentació i Medi natural, Generalitat de Catalunya, 08007 Barcelona, Spain
| | | | - Ignasi Marco
- Servei d'Ecopatologia de Fauna Salvatge, Departament de Medicina i Cirurgia Animals, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
| | - Santiago Lavín
- Servei d'Ecopatologia de Fauna Salvatge, Departament de Medicina i Cirurgia Animals, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
| | - Mariano Domingo
- IRTA, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus de la Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
- Departament de Sanitat i Anatomia Animals (DAAM), Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Llilianne Ganges
- IRTA, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus de la Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
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Summerfield A, Ruggli N. Immune Responses Against Classical Swine Fever Virus: Between Ignorance and Lunacy. Front Vet Sci 2015; 2:10. [PMID: 26664939 PMCID: PMC4672165 DOI: 10.3389/fvets.2015.00010] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Accepted: 04/20/2015] [Indexed: 11/14/2022] Open
Abstract
Classical swine fever virus infection of pigs causes disease courses from life-threatening to asymptomatic, depending on the virulence of the virus strain and the immunocompetence of the host. The virus targets immune cells, which are central in orchestrating innate and adaptive immune responses such as macrophages and conventional and plasmacytoid dendritic cells. Here, we review current knowledge and concepts aiming to explain the immunopathogenesis of the disease at both the host and the cellular level. We propose that the interferon type I system and in particular the interaction of the virus with plasmacytoid dendritic cells and macrophages is crucial to understand elements governing the induction of protective rather than pathogenic immune responses. The review also concludes that despite the knowledge available many aspects of classical swine fever immunopathogenesis are still puzzling.
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Affiliation(s)
| | - Nicolas Ruggli
- Institute of Virology and Immunology - IVI , Bern , Switzerland
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Tarradas J, de la Torre ME, Rosell R, Perez LJ, Pujols J, Muñoz M, Muñoz I, Muñoz S, Abad X, Domingo M, Fraile L, Ganges L. The impact of CSFV on the immune response to control infection. Virus Res 2014; 185:82-91. [PMID: 24657786 DOI: 10.1016/j.virusres.2014.03.004] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Revised: 03/05/2014] [Accepted: 03/06/2014] [Indexed: 11/19/2022]
Abstract
The severity of the acute form of CSF is responsible for the high mortality rate and has been the subject of many studies. Nevertheless, some animals are likely to develop a mild, chronic, or unapparent form of the disease. Paradoxically, this clinical form of the disease has not been well studied, especially regarding its pathogenesis. In this study, we investigated the infection in domestic pigs that is caused by the CSFV Cat01 strain, which is responsible for the 2001-2002 CSFV outbreak in Catalonia, Spain, and which caused mild and nonspecific clinical signs compared to the infection that is caused by another CSFV strain that is responsible for inducing severe clinical symptoms of disease. We assessed the impact of the CSFV infection in the immune system of domestic pigs, mainly on the kinetics of different cytokines, such as IFN-α (innate immunity) and IFN-γ (adaptive immune response), during the first weeks after infection. In addition, we evaluated the impact on the induction of the humoral response and its relation to the course of infection and the RNA CSFV viral load. The IFN-α levels in the serum samples from the pigs that developed a milder form of the CSF disease (infected with Cat01 strain) were lower than those that were detected in the pig with severe clinical CSF signs (Margarita strain). After infection with Cat01 strain, the IFN-γ levels in response to CSFV were detected in addition to the humoral response. Interestingly, in the serum samples of these animals, we detected the lowest load of CSFV RNA. Similarly, the lowest viral load levels were detected in the tonsils of these pigs. Both the T cells and the humoral response that were generated in most of the pigs that were infected with strain Cat01 may be related to the protection in the symptom progression of CSF against this viral strain. These results explain the antiviral role of IFN-γ in the absence of an antibody response. Likewise, these results corroborate the relevance and relationship that exists between the intensity of the T cell response and the protection against CSFV replication. Additionally, these results also explain how the failure to induce optimal levels of humoral and cellular responses after CSFV infection promotes the spread and persistence of the virus.
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Affiliation(s)
- Joan Tarradas
- Centre de Recerca en Sanitat Animal (CReSA), IRTA-UAB, Campus de la UAB, 08193 Bellaterra, Barcelona, Spain
| | - Maria Eugenia de la Torre
- Centre de Recerca en Sanitat Animal (CReSA), IRTA-UAB, Campus de la UAB, 08193 Bellaterra, Barcelona, Spain
| | - Rosa Rosell
- Centre de Recerca en Sanitat Animal (CReSA), IRTA-UAB, Campus de la UAB, 08193 Bellaterra, Barcelona, Spain; Departament d'Agricultura, Ramaderia, Pesca, Alimentació i Medi Natural (DAAM), Generalitat de Catalunya, Spain
| | - Lester Josue Perez
- Centre de Recerca en Sanitat Animal (CReSA), IRTA-UAB, Campus de la UAB, 08193 Bellaterra, Barcelona, Spain; Centro Nacional de Sanidad Agropecuaria (CENSA), La Habana, Cuba
| | - Joan Pujols
- Centre de Recerca en Sanitat Animal (CReSA), IRTA-UAB, Campus de la UAB, 08193 Bellaterra, Barcelona, Spain; Institut de Recerca i Tecnologia Agroalimentàries (IRTA), Barcelona, Spain
| | - Marta Muñoz
- Centre de Recerca en Sanitat Animal (CReSA), IRTA-UAB, Campus de la UAB, 08193 Bellaterra, Barcelona, Spain
| | - Iván Muñoz
- Centre de Recerca en Sanitat Animal (CReSA), IRTA-UAB, Campus de la UAB, 08193 Bellaterra, Barcelona, Spain
| | - Sara Muñoz
- Centre de Recerca en Sanitat Animal (CReSA), IRTA-UAB, Campus de la UAB, 08193 Bellaterra, Barcelona, Spain
| | - Xavier Abad
- Centre de Recerca en Sanitat Animal (CReSA), IRTA-UAB, Campus de la UAB, 08193 Bellaterra, Barcelona, Spain
| | - Mariano Domingo
- Centre de Recerca en Sanitat Animal (CReSA), IRTA-UAB, Campus de la UAB, 08193 Bellaterra, Barcelona, Spain; Departament de Producció Animal, ETSEA, Universidad de Lleida, 25198, Spain
| | - Lorenzo Fraile
- Centre de Recerca en Sanitat Animal (CReSA), IRTA-UAB, Campus de la UAB, 08193 Bellaterra, Barcelona, Spain; Departament de Sanitat i d'Anatomia Animals, Facultat de Veterinària, Universitat Autònoma de Barcelona (UAB), 08193 Bellaterra-Barcelona, Spain
| | - Llilianne Ganges
- Centre de Recerca en Sanitat Animal (CReSA), IRTA-UAB, Campus de la UAB, 08193 Bellaterra, Barcelona, Spain.
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Gladue DP, Baker-Bransetter R, Holinka LG, Fernandez-Sainz IJ, O’Donnell V, Fletcher P, Lu Z, Borca MV. Interaction of CSFV E2 protein with swine host factors as detected by yeast two-hybrid system. PLoS One 2014; 9:e85324. [PMID: 24416391 PMCID: PMC3885694 DOI: 10.1371/journal.pone.0085324] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Accepted: 11/26/2013] [Indexed: 01/31/2023] Open
Abstract
E2 is one of the envelope glycoproteins of pestiviruses, including classical swine fever virus (CSFV) and bovine viral diarrhea virus (BVDV). E2 is involved in several critical functions, including virus entry into target cells, induction of a protective immune response and virulence in swine. However, there is no information regarding any host binding partners for the E2 proteins. Here, we utilized the yeast two-hybrid system and identified fifty-seven host proteins as positive binding partners which bound E2 from both CSFV and BVDV with the exception of two proteins that were found to be positive for binding only to CSFV E2. Alanine scanning of CSFV E2 demonstrated that the binding sites for these cellular proteins on E2 are likely non-linear binding sites. The possible roles of the identified host proteins are discussed as the results presented here will be important for future studies to elucidate mechanisms of host protein-virus interactions during pestivirus infection. However, due to the limitations of the yeast two hybrid system, the proteins identified is not exhaustive and each interaction identified needs to be confirmed by independent experimental approaches in the context of virus-infected cells before any definitive conclusion can be drawn on relevance for the virus life cycle.
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Affiliation(s)
- Douglas P. Gladue
- Plum Island Animal Disease Center, Agriculture Research Service, United States Department of Agriculture, Greenport, New York, United States of America
- Department of Pathobiology and Veterinary Science, University of Connecticut, Storrs, Connecticut, United States of America
| | - Ryan Baker-Bransetter
- Plum Island Animal Disease Center, Agriculture Research Service, United States Department of Agriculture, Greenport, New York, United States of America
| | - Lauren G. Holinka
- Plum Island Animal Disease Center, Agriculture Research Service, United States Department of Agriculture, Greenport, New York, United States of America
| | - Ignacio J. Fernandez-Sainz
- Plum Island Animal Disease Center, Agriculture Research Service, United States Department of Agriculture, Greenport, New York, United States of America
| | - Vivian O’Donnell
- Plum Island Animal Disease Center, Agriculture Research Service, United States Department of Agriculture, Greenport, New York, United States of America
- Department of Pathobiology and Veterinary Science, University of Connecticut, Storrs, Connecticut, United States of America
| | - Paige Fletcher
- Plum Island Animal Disease Center, Agriculture Research Service, United States Department of Agriculture, Greenport, New York, United States of America
| | - Zhiqiang Lu
- Plum Island Animal Disease Center, Department of Homeland Security, Greenport, New York, United States of America
| | - Manuel V. Borca
- Plum Island Animal Disease Center, Agriculture Research Service, United States Department of Agriculture, Greenport, New York, United States of America
- * E-mail:
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García-Nicolás O, Baumann A, Vielle NJ, Gómez-Laguna J, Quereda JJ, Pallarés FJ, Ramis G, Carrasco L, Summerfield A. Virulence and genotype-associated infectivity of interferon-treated macrophages by porcine reproductive and respiratory syndrome viruses. Virus Res 2014; 179:204-11. [DOI: 10.1016/j.virusres.2013.08.009] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Revised: 08/21/2013] [Accepted: 08/22/2013] [Indexed: 10/26/2022]
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Dong XY, Liu WJ, Zhao MQ, Wang JY, Pei JJ, Luo YW, Ju CM, Chen JD. Classical swine fever virus triggers RIG-I and MDA5-dependent signaling pathway to IRF-3 and NF-κB activation to promote secretion of interferon and inflammatory cytokines in porcine alveolar macrophages. Virol J 2013; 10:286. [PMID: 24034559 PMCID: PMC3849481 DOI: 10.1186/1743-422x-10-286] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2013] [Accepted: 07/24/2013] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Classical swine fever (CSF) caused by CSF virus (CSFV) is a highly contagious disease of pigs. The RNA helicases retinoic acid-inducible gene I (RIG-I) and melanoma differentiation-associated gene 5 (MDA-5) are differentially involved in the detection of various RNA viruses. In present study, we investigated the roles of RIG-I and MDA-5 in eliciting antiviral and inflammatory responses to CSFV shimen strain in Porcine alveolar macrophages (PAMs). METHODS CSFV Shimen strain was used as challenge virus in this study and PAMs were cultured in vitro. Interferon regulatory factor (IRF)-3 and nuclear factor-kappa B (NF-κB) translocation was detected using immunofluorescent staining; RIG-I, MDA5, interferon promoter-stimulating factor 1 (IPS-1), IRF-3 and NF-κB expression was measured by Western Blotting; Interferon beta (IFN-β), IFN-α, interleukin-1beta (IL-1β), IL-6 and tumor necrosis factor (TNF-α) expression was tested by Enzyme-linked immunosorbent assays (ELISA) and shRNA-mediated knockdown of MDA5 or RIG-I was performed. RESULTS The findings suggested that the initial response to CSFV infection resulted in the higher expression of RIG-I and MDA5 leading to the activation of IPS-1, IRF-3 and NF-κB in a dose-dependent manner. Evaluation of IFN-α, IFN-β, IL-1β, IL-6 or TNF-α expressed by PAMs showed significant differences between infected and uninfected cells. CSFV infected cells induced to express high levels of IFN-α, IFN-β, IL-1β, IL-6 and TNF-α in a dose-dependent way within 24 h post-infection (hpi). At the same time, CSFV improved the nuclear translocation of IRF-3 and NF-κB. We also directly compared and assessed the roles of RIG-I and MDA5 in triggering innate immune actions during CSFV infection through shRNA-mediated knockdown of MDA5 or RIG-I. We found that, compared to the control, the production of IFN-α, IFN-β, IL-1β, IL-6 and TNF-α in response to CSFV infection was heavily reduced in RIG-I knockdown cells while it was moderately decreased in MDA5 knockdown cells. PAMs derived from knockdown of both RIG-I and MDA5 almost failed to produce IFNs and inflammatory cytokines. CONCLUSIONS It indicates that CSFV can be recognized by both RIG-I and MDA5 to initiate the RIG-I signaling pathway to trigger innate defenses against infection.
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Affiliation(s)
- Xiao-Ying Dong
- College of Veterinary Medicine, South China Agricultural University, No.483 Wu Shan Road, Tian He District, Guangzhou 510642, China
- College of Yingdong Agricultural Science and Engineering, Shaoguan University, Daxue Avenue, Zhenjiang District, Shaoguan 512005, China
| | - Wen-Jun Liu
- College of Veterinary Medicine, South China Agricultural University, No.483 Wu Shan Road, Tian He District, Guangzhou 510642, China
| | - Ming-Qiu Zhao
- College of Veterinary Medicine, South China Agricultural University, No.483 Wu Shan Road, Tian He District, Guangzhou 510642, China
| | - Jia-Ying Wang
- College of Veterinary Medicine, South China Agricultural University, No.483 Wu Shan Road, Tian He District, Guangzhou 510642, China
| | - Jing-Jing Pei
- College of Veterinary Medicine, South China Agricultural University, No.483 Wu Shan Road, Tian He District, Guangzhou 510642, China
| | - Yong-Wen Luo
- College of Veterinary Medicine, South China Agricultural University, No.483 Wu Shan Road, Tian He District, Guangzhou 510642, China
| | - Chun-Mei Ju
- College of Veterinary Medicine, South China Agricultural University, No.483 Wu Shan Road, Tian He District, Guangzhou 510642, China
| | - Jin-Ding Chen
- College of Veterinary Medicine, South China Agricultural University, No.483 Wu Shan Road, Tian He District, Guangzhou 510642, China
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Python S, Gerber M, Suter R, Ruggli N, Summerfield A. Efficient sensing of infected cells in absence of virus particles by plasmacytoid dendritic cells is blocked by the viral ribonuclease E(rns.). PLoS Pathog 2013; 9:e1003412. [PMID: 23785283 PMCID: PMC3681750 DOI: 10.1371/journal.ppat.1003412] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2012] [Accepted: 04/25/2013] [Indexed: 02/07/2023] Open
Abstract
Plasmacytoid dendritic cells (pDC) have been shown to efficiently sense HCV- or HIV-infected cells, using a virion-free pathway. Here, we demonstrate for classical swine fever virus, a member of the Flaviviridae, that this process is much more efficient in terms of interferon-alpha induction when compared to direct stimulation by virus particles. By employment of virus replicon particles or infectious RNA which can replicate but not form de novo virions, we exclude a transfer of virus from the donor cell to the pDC. pDC activation by infected cells was mediated by a contact-dependent RNA transfer to pDC, which was sensitive to a TLR7 inhibitor. This was inhibited by drugs affecting the cytoskeleton and membrane cholesterol. We further demonstrate that a unique viral protein with ribonuclease activity, the viral Erns protein of pestiviruses, efficiently prevented this process. This required intact ribonuclease function in intracellular compartments. We propose that this pathway of activation could be of particular importance for viruses which tend to be mostly cell-associated, cause persistent infection, and are non-cytopathogenic. Plasmacytoid dendritic cells (pDC) represent the most potent producers of interferon type I and are therefore of major importance in antiviral defences. A TLR7-dependent induction of interferon-α in pDC by infected cells in the absence of virions has been demonstrated for hepatitis C virus. Here, we show that this pathway is also very efficient for classical swine fever virus, a pestivirus that is also a member of the Flaviviridae. Our data indicate a transfer of RNA from the donor cell to pDC in a cell-contact-dependent manner requiring intact lipid rafts and cytoskeleton of the donor cell. Importantly, we demonstrate that the enigmatic viral Erns protein unique to pestiviruses efficiently prevents this pathway of pDC activation. This novel function of Erns is dependent on its RNase activity within intracellular compartments. The present study underlines the importance of pDC activation by infected cells and identifies a novel pathway of virus escaping the interferon system. Considering that Erns is required for pestiviruses to establish persistent infection of foetuses after transplacental virus transmission resulting in the development of immunotolerant animals, this report also points on a possible role of pDC in preventing immunotolerance after viral infection of foetuses.
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Affiliation(s)
- Sylvie Python
- Institute of Virology and Immunology, Mittelhäusern, Switzerland
| | - Markus Gerber
- Institute of Virology and Immunology, Mittelhäusern, Switzerland
| | - Rolf Suter
- Institute of Virology and Immunology, Mittelhäusern, Switzerland
| | - Nicolas Ruggli
- Institute of Virology and Immunology, Mittelhäusern, Switzerland
- * E-mail: (NR); (AS)
| | - Artur Summerfield
- Institute of Virology and Immunology, Mittelhäusern, Switzerland
- * E-mail: (NR); (AS)
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