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Ackermann-Gäumann R, Dentand A, Lienhard R, Saeed M, Speiser DE, MacDonald MR, Coste AT, Cagno V. A reporter virus particle seroneutralization assay for tick-borne encephalitis virus overcomes ELISA limitations. J Med Virol 2024; 96:e29843. [PMID: 39092814 DOI: 10.1002/jmv.29843] [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: 03/15/2024] [Revised: 07/12/2024] [Accepted: 07/24/2024] [Indexed: 08/04/2024]
Abstract
Tick-borne encephalitis (TBE) virus is the most prevalent tick-transmitted orthoflavivirus in Europe. Due to the nonspecific nature of its symptoms, TBE is primarily diagnosed by ELISA-based detection of specific antibodies in the patient serum. However, cross-reactivity between orthoflaviviruses complicates the diagnosis. Specificity issues may be mitigated by serum neutralization assays (SNT), although the handling of clinically relevant orthoflaviviruses requires biosafety level (BSL) 3 conditions and they have highly divergent viral kinetics and cell tropisms. In the present study, we established a reporter virus particle (RVP)-based SNT in which the infectivity is measured by luminescence and that can be performed under BSL-2 conditions. The RVP-based SNT for TBEV exhibited a highly significant correlation with the traditional virus-based SNT (R2 = 0.8637, p < 0.0001). The RVP-based assay demonstrated a sensitivity of 92.3% (95% CI: 79.7%-97.4%) and specificity of 100% (95% CI: 81.6%-100%). We also tested the cross-reactivity of serum samples in RVP-based assays against other orthoflaviviruses (yellow fever virus, dengue virus type 2, Zika virus, West Nile virus and Japanese encephalitis virus). Interestingly, all serum samples which had tested TBEV-positive by ELISA but negative by RVP-based SNT were reactive for antibodies against other orthoflaviviruses. Thus, the RVP-based seroneutralization assay provides an added value in clinical diagnostics as well as in epidemiological studies.
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Affiliation(s)
- Rahel Ackermann-Gäumann
- Swiss National Reference Centre for Tick-Transmitted Diseases, Lausanne, Switzerland
- ADMED Microbiologie, La Chaux-de-Fonds, Switzerland
| | - Alexis Dentand
- Institute of Microbiology, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | - Reto Lienhard
- Swiss National Reference Centre for Tick-Transmitted Diseases, Lausanne, Switzerland
- ADMED Microbiologie, La Chaux-de-Fonds, Switzerland
| | - Mohsan Saeed
- Department of Biochemistry & Cell Biology, Boston University Chobanian and Avedisian School of Medicine, Boston University, Boston, Massachusetts, USA
- National Emerging Infectious Diseases Laboratories, Boston University, Boston, Massachusetts, USA
| | - Daniel E Speiser
- Institute of Microbiology, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | - Margaret R MacDonald
- Laboratory of Virology and Infectious Disease, The Rockefeller University, New York, New York, USA
| | - Alix T Coste
- Swiss National Reference Centre for Tick-Transmitted Diseases, Lausanne, Switzerland
- Institute of Microbiology, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | - Valeria Cagno
- Swiss National Reference Centre for Tick-Transmitted Diseases, Lausanne, Switzerland
- Institute of Microbiology, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
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2
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Santos-Peral A, Luppa F, Goresch S, Nikolova E, Zaucha M, Lehmann L, Dahlstroem F, Karimzadeh H, Thorn-Seshold J, Winheim E, Schuster EM, Dobler G, Hoelscher M, Kümmerer BM, Endres S, Schober K, Krug AB, Pritsch M, Barba-Spaeth G, Rothenfusser S. Prior flavivirus immunity skews the yellow fever vaccine response to cross-reactive antibodies with potential to enhance dengue virus infection. Nat Commun 2024; 15:1696. [PMID: 38402207 PMCID: PMC10894228 DOI: 10.1038/s41467-024-45806-x] [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: 07/03/2023] [Accepted: 02/05/2024] [Indexed: 02/26/2024] Open
Abstract
The yellow fever 17D vaccine (YF17D) is highly effective but is frequently administered to individuals with pre-existing cross-reactive immunity, potentially impacting their immune responses. Here, we investigate the impact of pre-existing flavivirus immunity induced by the tick-borne encephalitis virus (TBEV) vaccine on the response to YF17D vaccination in 250 individuals up to 28 days post-vaccination (pv) and 22 individuals sampled one-year pv. Our findings indicate that previous TBEV vaccination does not affect the early IgM-driven neutralizing response to YF17D. However, pre-vaccination sera enhance YF17D virus infection in vitro via antibody-dependent enhancement (ADE). Following YF17D vaccination, TBEV-pre-vaccinated individuals develop high amounts of cross-reactive IgG antibodies with poor neutralizing capacity. In contrast, TBEV-unvaccinated individuals elicit a non-cross-reacting neutralizing response. Using YF17D envelope protein mutants displaying different epitopes, we identify quaternary dimeric epitopes as the primary target of neutralizing antibodies. Additionally, TBEV-pre-vaccination skews the IgG response towards the pan-flavivirus fusion loop epitope (FLE), capable of mediating ADE of dengue and Zika virus infections in vitro. Together, we propose that YF17D vaccination conceals the FLE in individuals without prior flavivirus exposure but favors a cross-reactive IgG response in TBEV-pre-vaccinated recipients directed to the FLE with potential to enhance dengue virus infection.
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Affiliation(s)
- Antonio Santos-Peral
- Division of Clinical Pharmacology, LMU University Hospital, LMU Munich, Munich, Germany
| | - Fabian Luppa
- Division of Infectious Diseases and Tropical Medicine, LMU University Hospital, LMU Munich, Munich, Germany
| | - Sebastian Goresch
- Division of Clinical Pharmacology, LMU University Hospital, LMU Munich, Munich, Germany
| | - Elena Nikolova
- Division of Clinical Pharmacology, LMU University Hospital, LMU Munich, Munich, Germany
| | - Magdalena Zaucha
- Division of Clinical Pharmacology, LMU University Hospital, LMU Munich, Munich, Germany
| | - Lisa Lehmann
- Division of Clinical Pharmacology, LMU University Hospital, LMU Munich, Munich, Germany
| | - Frank Dahlstroem
- Division of Clinical Pharmacology, LMU University Hospital, LMU Munich, Munich, Germany
| | - Hadi Karimzadeh
- Division of Clinical Pharmacology, LMU University Hospital, LMU Munich, Munich, Germany
- Department of Veterinary Sciences, LMU Munich, Munich, Germany
| | - Julia Thorn-Seshold
- Division of Clinical Pharmacology, LMU University Hospital, LMU Munich, Munich, Germany
- Faculty of Chemistry and Pharmacy, LMU Munich, Munich, Germany
| | - Elena Winheim
- Institute for Immunology, Biomedical Center (BMC), Medical Faculty, LMU Munich, Munich, Germany
| | - Ev-Marie Schuster
- Mikrobiologisches Institut-Klinische Mikrobiologie, Immunologie und Hygiene, Universitätsklinikum Erlangen, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Gerhard Dobler
- Bundeswehr Institute of Microbiology, Neuherbergstrasse 11, 80937, Munich, Germany
| | - Michael Hoelscher
- Division of Infectious Diseases and Tropical Medicine, LMU University Hospital, LMU Munich, Munich, Germany
- German Centre for Infection Research, Partner Site Munich, 80799, Munich, Germany
- Fraunhofer Institute for Translational Medicine and Pharmacology, Immunology, Infection and Pandemic Research, 80799, Munich, Germany
| | - Beate M Kümmerer
- Institute of Virology, Medical Faculty, University of Bonn, 53127, Bonn, Germany
- German Centre for Infection Research, Partner Site Bonn-Cologne, 53127, Bonn, Germany
| | - Stefan Endres
- Division of Clinical Pharmacology, LMU University Hospital, LMU Munich, Munich, Germany
- Einheit für Klinische Pharmakologie (EKLiP) Helmholtz Zentrum München German Research Center for Environmental Health (HMGU), Neuherberg, Germany
| | - Kilian Schober
- Mikrobiologisches Institut-Klinische Mikrobiologie, Immunologie und Hygiene, Universitätsklinikum Erlangen, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany
- FAU Profile Center Immunomedicine, FAU Erlangen-Nürnberg, Erlangen, Germany
| | - Anne B Krug
- Institute for Immunology, Biomedical Center (BMC), Medical Faculty, LMU Munich, Munich, Germany
| | - Michael Pritsch
- Division of Infectious Diseases and Tropical Medicine, LMU University Hospital, LMU Munich, Munich, Germany
| | - Giovanna Barba-Spaeth
- Institut Pasteur, Université Paris Cité, CNRS UMR 3569, Unité de Virologie Structurale, Paris, France.
| | - Simon Rothenfusser
- Division of Clinical Pharmacology, LMU University Hospital, LMU Munich, Munich, Germany.
- Einheit für Klinische Pharmakologie (EKLiP) Helmholtz Zentrum München German Research Center for Environmental Health (HMGU), Neuherberg, Germany.
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3
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Xu Y, Vertrees D, He Y, Momben-Abolfath S, Li X, Brewah YA, Scott DE, Konduru K, Rios M, Struble EB. Nanoluciferase Reporter Zika Viruses as Tools for Assessing Infection Kinetics and Antibody Potency. Viruses 2023; 15:2190. [PMID: 38005868 PMCID: PMC10674863 DOI: 10.3390/v15112190] [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: 09/12/2023] [Revised: 10/16/2023] [Accepted: 10/25/2023] [Indexed: 11/26/2023] Open
Abstract
Zika virus (ZIKV) has become endemic in multiple tropical and subtropical regions and has the potential to become widespread in countries with limited prior exposure to this infection. One of the most concerning sequelae of ZIKV infection is the teratogenic effect on the developing fetus, with the mechanisms of viral spread to and across the placenta remaining largely unknown. Although vaccine trials and prophylactic or therapeutic treatments are being studied, there are no approved treatments or vaccines for ZIKV. Appropriate tests, including potency and in vivo assays to assess the safety and efficacy of these modalities, can greatly aid both the research of the pathophysiology of the infection and the development of anti-ZIKV therapeutics. Building on previous work, we tested reporter ZIKV variants that express nanoluciferase in cell culture and in vivo assays. We found that these variants can propagate in cells shown to be susceptible to the widely used clinical isolate PRVABC59, including Vero and human placenta cell lines. When used in neutralization assays with bioluminescence as readout, these variants gave rise to neutralization curves similar to those produced by PRVABC59, while being better suited for performing high-throughput assays. In addition, the engineered reporter variants can be useful research tools when used in other in vitro and in vivo assays, as we illustrated in transcytosis experiments and a pilot study in guinea pigs.
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Affiliation(s)
- Yanqun Xu
- Laboratory of Plasma Derivatives, Division of Plasma Protein Therapeutics, Office of Tissues and Advanced Therapies, Center for Biologics Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD 20993, USA; (Y.X.); (D.V.); (Y.H.); (X.L.); (Y.A.B.); (D.E.S.)
| | - Devin Vertrees
- Laboratory of Plasma Derivatives, Division of Plasma Protein Therapeutics, Office of Tissues and Advanced Therapies, Center for Biologics Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD 20993, USA; (Y.X.); (D.V.); (Y.H.); (X.L.); (Y.A.B.); (D.E.S.)
| | - Yong He
- Laboratory of Plasma Derivatives, Division of Plasma Protein Therapeutics, Office of Tissues and Advanced Therapies, Center for Biologics Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD 20993, USA; (Y.X.); (D.V.); (Y.H.); (X.L.); (Y.A.B.); (D.E.S.)
| | - Sanaz Momben-Abolfath
- Laboratory of Plasma Derivatives, Division of Plasma Protein Therapeutics, Office of Tissues and Advanced Therapies, Center for Biologics Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD 20993, USA; (Y.X.); (D.V.); (Y.H.); (X.L.); (Y.A.B.); (D.E.S.)
| | - Xiaohong Li
- Laboratory of Plasma Derivatives, Division of Plasma Protein Therapeutics, Office of Tissues and Advanced Therapies, Center for Biologics Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD 20993, USA; (Y.X.); (D.V.); (Y.H.); (X.L.); (Y.A.B.); (D.E.S.)
| | - Yambasu A. Brewah
- Laboratory of Plasma Derivatives, Division of Plasma Protein Therapeutics, Office of Tissues and Advanced Therapies, Center for Biologics Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD 20993, USA; (Y.X.); (D.V.); (Y.H.); (X.L.); (Y.A.B.); (D.E.S.)
| | - Dorothy E. Scott
- Laboratory of Plasma Derivatives, Division of Plasma Protein Therapeutics, Office of Tissues and Advanced Therapies, Center for Biologics Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD 20993, USA; (Y.X.); (D.V.); (Y.H.); (X.L.); (Y.A.B.); (D.E.S.)
| | - Krishnamurthy Konduru
- Laboratory of Molecular Virology, Division of Emerging and Transfusion Transmitted Diseases, Office of Blood Research and Review, Center for Biologics Evaluation and Research, Food and Drug Administration (FDA), Silver Spring, MD 20993, USA; (K.K.); (M.R.)
| | - Maria Rios
- Laboratory of Molecular Virology, Division of Emerging and Transfusion Transmitted Diseases, Office of Blood Research and Review, Center for Biologics Evaluation and Research, Food and Drug Administration (FDA), Silver Spring, MD 20993, USA; (K.K.); (M.R.)
| | - Evi B. Struble
- Laboratory of Plasma Derivatives, Division of Plasma Protein Therapeutics, Office of Tissues and Advanced Therapies, Center for Biologics Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD 20993, USA; (Y.X.); (D.V.); (Y.H.); (X.L.); (Y.A.B.); (D.E.S.)
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4
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Welch SR, Spengler JR, Genzer SC, Coleman-McCray JD, Harmon JR, Sorvillo TE, Scholte FE, Rodriguez SE, O’Neal TJ, Ritter JM, Ficarra G, Davies KA, Kainulainen MH, Karaaslan E, Bergeron É, Goldsmith CS, Lo MK, Nichol ST, Montgomery JM, Spiropoulou CF. Single-dose mucosal replicon-particle vaccine protects against lethal Nipah virus infection up to 3 days after vaccination. SCIENCE ADVANCES 2023; 9:eadh4057. [PMID: 37540755 PMCID: PMC10403222 DOI: 10.1126/sciadv.adh4057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 07/05/2023] [Indexed: 08/06/2023]
Abstract
Nipah virus (NiV) causes a highly lethal disease in humans who present with acute respiratory or neurological signs. No vaccines against NiV have been approved to date. Here, we report on the clinical impact of a novel NiV-derived nonspreading replicon particle lacking the fusion (F) protein gene (NiVΔF) as a vaccine in three small animal models of disease. A broad antibody response was detected that included immunoglobulin G (IgG) and IgA subtypes with demonstrable Fc-mediated effector function targeting multiple viral antigens. Single-dose intranasal vaccination up to 3 days before challenge prevented clinical signs and reduced virus levels in hamsters and immunocompromised mice; decreases were seen in tissues and mucosal secretions, critically decreasing potential for virus transmission. This virus replicon particle system provides a vital tool to the field and demonstrates utility as a highly efficacious and safe vaccine candidate that can be administered parenterally or mucosally to protect against lethal Nipah disease.
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Affiliation(s)
- Stephen R. Welch
- Viral Special Pathogens Branch, Division of High Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
| | - Jessica R. Spengler
- Viral Special Pathogens Branch, Division of High Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
| | - Sarah C. Genzer
- Viral Special Pathogens Branch, Division of High Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
| | - JoAnn D. Coleman-McCray
- Viral Special Pathogens Branch, Division of High Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
- Infectious Disease Pathology Branch, Division of High Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
| | - Jessica R. Harmon
- Viral Special Pathogens Branch, Division of High Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
| | - Teresa E. Sorvillo
- Viral Special Pathogens Branch, Division of High Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
| | - Florine E. M. Scholte
- Viral Special Pathogens Branch, Division of High Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
| | - Sergio E. Rodriguez
- Viral Special Pathogens Branch, Division of High Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
| | - T. Justin O’Neal
- Viral Special Pathogens Branch, Division of High Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
| | - Jana M. Ritter
- Infectious Disease Pathology Branch, Division of High Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
| | - Georgia Ficarra
- Infectious Disease Pathology Branch, Division of High Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
| | - Katherine A. Davies
- Viral Special Pathogens Branch, Division of High Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
| | - Markus H. Kainulainen
- Viral Special Pathogens Branch, Division of High Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
| | - Elif Karaaslan
- Viral Special Pathogens Branch, Division of High Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
| | - Éric Bergeron
- Viral Special Pathogens Branch, Division of High Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
| | - Cynthia S. Goldsmith
- Infectious Disease Pathology Branch, Division of High Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
| | - Michael K. Lo
- Viral Special Pathogens Branch, Division of High Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
| | - Stuart T. Nichol
- Viral Special Pathogens Branch, Division of High Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
| | - Joel M. Montgomery
- Viral Special Pathogens Branch, Division of High Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
| | - Christina F. Spiropoulou
- Viral Special Pathogens Branch, Division of High Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA
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5
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Lin G, Zhang Y. Mutations in the non-structural protein coding region regulate gene expression from replicon RNAs derived from Venezuelan equine encephalitis virus. Biotechnol Lett 2023:10.1007/s10529-023-03379-7. [PMID: 37266878 DOI: 10.1007/s10529-023-03379-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 02/14/2023] [Accepted: 04/11/2023] [Indexed: 06/03/2023]
Abstract
Self-replicating RNA (repRNA) derived from Venezuelan equine encephalitis (VEE) virus is a promising platform for gene therapy and confers prolonged gene expression due to its self-replicating capability, but repRNA suffers from a suboptimal transgene expression level due to its induction of intracellular innate response which may result in inhibition of translation. To improve transgene expression of repRNA, we introduced point mutations in the non-structural protein 1-4 (nsP1-4) coding region of VEE replicon vectors. As a proof of concept, inflammatory cytokines served as genes of interest and were cloned in their wild type and several mutant replicon vectors, followed by transfection in mammalian cells. Our data show that VEE replicons bearing nsP1GGAC-nsP2T or nsP1GGAC-nsP2AT mutations in the nsP1-4 coding region could significantly reduce the recognition by innate immunity as evidenced by the decreased production of type I interferon, and enhance transgene expression in host cells. Thus, the newly discovered mutant VEE replicon vectors could serve as promising gene expression platforms to advance VEE-derived repRNA-based gene therapies.
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Affiliation(s)
- Guibin Lin
- School of Biomedical Sciences and Engineering, South China University of Technology, Guangzhou International Campus, Guangzhou, 511442, Guangdong, China
- National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, 510006, Guangdong, China
- Guangdong Provincial Key Laboratory of Biomedical Engineering, South China University of Technology, Guangzhou, 510006, Guangdong, China
- Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education, South China University of Technology, Guangzhou, 510006, Guangdong, China
| | - Yuan Zhang
- School of Biomedical Sciences and Engineering, South China University of Technology, Guangzhou International Campus, Guangzhou, 511442, Guangdong, China.
- National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, 510006, Guangdong, China.
- Guangdong Provincial Key Laboratory of Biomedical Engineering, South China University of Technology, Guangzhou, 510006, Guangdong, China.
- Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education, South China University of Technology, Guangzhou, 510006, Guangdong, China.
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6
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Li Y, Ren C, Li C, Xiao Y, Zhou Y. A Recombinant Porcine Reproductive and Respiratory Syndrome Virus Stably Expressing a Gaussia Luciferase for Antiviral Drug Screening Assay and Luciferase-Based Neutralization Assay. Front Microbiol 2022; 13:907281. [PMID: 35633700 PMCID: PMC9136234 DOI: 10.3389/fmicb.2022.907281] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Accepted: 04/26/2022] [Indexed: 12/31/2022] Open
Abstract
The reverse genetics system is a valuable tool in the virological study of RNA viruses. With the availability of reverse genetics, the porcine reproductive and respiratory syndrome virus (PRRSV) has been utilized as a viral vector for the expression of foreign genes of interest. Here, we constructed a full-length cDNA clone of a highly pathogenic PRRSV (HP-PRRSV) TA-12 strain. Using this cDNA clone, we generated a reporter virus expressing a gaussia luciferase (Gluc) via an additional subgenomic RNA between ORF7 and 3′UTR. This reporter virus exhibited similar growth kinetics to the wild-type (WT) virus and remained genetically stable for at least ten passages in MARC-145 cells. In cells infected with this reporter virus, the correlation between the expression levels of Gluc in culture media and the virus titers suggested that Gluc is a good indicator of the reporter virus infection. With this reporter virus, we further established the Gluc readout-based assays for antiviral drug screening and serum neutralizing antibody detection that exhibited comparable performance to the classical assays. Taken together, we established a reverse genetics system of HP-PRRSV and generated a novel reporter virus that could serve as a valuable tool for antiviral drug screening and serum neutralizing antibody detection.
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Affiliation(s)
- Yanhua Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou, China
- Comparative Medicine Research Institute, Yangzhou University, Yangzhou, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou, China
- *Correspondence: Yanhua Li,
| | - Cicheng Ren
- College of Veterinary Medicine, Yangzhou University, Yangzhou, China
| | - Chenxi Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou, China
- Comparative Medicine Research Institute, Yangzhou University, Yangzhou, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou, China
| | - Yihong Xiao
- College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Tai’an, China
| | - Yanyang Zhou
- College of Veterinary Medicine, Yangzhou University, Yangzhou, China
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