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Zhang M, Yang C, Wu X, Wang Y, Wang L, Cui Q, Tong J, An Y, Cai M, Cheng S, Jiang Q, Wang Y, Zhao C, Wang Y, Huang W. Antigenic analysis of the influenza B virus hemagglutinin protein. Virol Sin 2024:S1995-820X(24)00139-1. [PMID: 39233140 DOI: 10.1016/j.virs.2024.08.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Accepted: 08/30/2024] [Indexed: 09/06/2024] Open
Abstract
Influenza B viruses (IBVs) primarily infect humans and are a common cause of respiratory infections in humans. Here, to systematically analyze the antigenicity of the IBVs Hemagglutinin (HA) protein, 31 B/Victoria and 19 B/Yamagata representative circulating strains were selected from Global Initiative of Sharing All Influenza Data (GISAID), and pseudotyped viruses were constructed with the vesicular stomatitis virus system. Guinea pigs were immunized with three doses of vaccines (one dose of DNA vaccines following two doses of pseudotyped virus vaccines) of the seven IBV vaccine strains, and neutralizing antibodies against the pseudotyped viruses were tested. By comparing differences between various vaccine strains, we constructed several pseudotyped viruses that contained various mutations based on vaccine strain BV-21. The vaccine strains showed good neutralization levels against the epidemic virus strains of the same year, with neutralization titers ranging from 370 to 840, while the level of neutralization against viruses prevalent in previous years decreased 1-10-fold. Each of the high-frequency epidemic strains of B/Victoria and B/Yamagata not only induced high neutralizing titers, but also had broadly neutralizing effects against virus strains of different years, with neutralizing titers ranging from 1000 to 7200. R141G, D197N, and R203K were identified as affecting the antigenicity of IBV. In this study, pseudotyped virus system was used to monitor the cross-neutralizing efficacy of high-frequency epidemic strains and vaccine strains recommended by the World Health Organization. Additionally, we identified three mutation sites that can seriously affect the antigenicity of B/Victoria vaccine strains. These mutation sites provide valuable references for the selection and design of a universal IBV vaccine strain in the future.
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Affiliation(s)
- Mengyi Zhang
- Division of HIV/AIDS and Sex-Transmitted Virus Vaccines, Institute for Biological Product Control, National Institutes for Food and Drug Control (NIFDC), Beijing, 102629, China; National Institutes for Food and Drug Control, Chinese Academy of Medical Science & Peking Union Medical College, Beijing, 100730, China
| | - Chaoying Yang
- Division of HIV/AIDS and Sex-Transmitted Virus Vaccines, Institute for Biological Product Control, National Institutes for Food and Drug Control (NIFDC), Beijing, 102629, China; National Vaccine & Serum Institute, Beijing, 101111, China
| | - Xi Wu
- Division of HIV/AIDS and Sex-Transmitted Virus Vaccines, Institute for Biological Product Control, National Institutes for Food and Drug Control (NIFDC), Beijing, 102629, China
| | - Yifei Wang
- Division of HIV/AIDS and Sex-Transmitted Virus Vaccines, Institute for Biological Product Control, National Institutes for Food and Drug Control (NIFDC), Beijing, 102629, China
| | - Lijie Wang
- Division of HIV/AIDS and Sex-Transmitted Virus Vaccines, Institute for Biological Product Control, National Institutes for Food and Drug Control (NIFDC), Beijing, 102629, China
| | - Qianqian Cui
- Division of HIV/AIDS and Sex-Transmitted Virus Vaccines, Institute for Biological Product Control, National Institutes for Food and Drug Control (NIFDC), Beijing, 102629, China
| | - Jincheng Tong
- Division of HIV/AIDS and Sex-Transmitted Virus Vaccines, Institute for Biological Product Control, National Institutes for Food and Drug Control (NIFDC), Beijing, 102629, China
| | - Yimeng An
- Division of HIV/AIDS and Sex-Transmitted Virus Vaccines, Institute for Biological Product Control, National Institutes for Food and Drug Control (NIFDC), Beijing, 102629, China
| | - Meina Cai
- Division of HIV/AIDS and Sex-Transmitted Virus Vaccines, Institute for Biological Product Control, National Institutes for Food and Drug Control (NIFDC), Beijing, 102629, China
| | - Shishi Cheng
- Division of HIV/AIDS and Sex-Transmitted Virus Vaccines, Institute for Biological Product Control, National Institutes for Food and Drug Control (NIFDC), Beijing, 102629, China
| | - Qi Jiang
- Division of HIV/AIDS and Sex-Transmitted Virus Vaccines, Institute for Biological Product Control, National Institutes for Food and Drug Control (NIFDC), Beijing, 102629, China
| | - Yulin Wang
- National Vaccine & Serum Institute, Beijing, 101111, China.
| | - Chenyan Zhao
- Division of HIV/AIDS and Sex-Transmitted Virus Vaccines, Institute for Biological Product Control, National Institutes for Food and Drug Control (NIFDC), Beijing, 102629, China.
| | - Youchun Wang
- Institute of Medical Biology, Chinese Academy of Medical Science & Peking Union Medical College, Kunming, 650031, China.
| | - Weijin Huang
- Division of HIV/AIDS and Sex-Transmitted Virus Vaccines, Institute for Biological Product Control, National Institutes for Food and Drug Control (NIFDC), Beijing, 102629, China; National Institutes for Food and Drug Control, Chinese Academy of Medical Science & Peking Union Medical College, Beijing, 100730, China.
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Din GU, Wu C, Tariq Z, Hasham K, Amjad MN, Shen B, Yue L, Raza MA, Ashraf MA, Chen L, Hu Y. Unlocking influenza B: exploring molecular biology and reverse genetics for epidemic control and vaccine innovation. Virol J 2024; 21:196. [PMID: 39180083 PMCID: PMC11344405 DOI: 10.1186/s12985-024-02433-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2024] [Accepted: 07/08/2024] [Indexed: 08/26/2024] Open
Abstract
Influenza is a highly contagious acute viral illness that affects the respiratory system, posing a significant global public health concern. Influenza B virus (IBV) causes annual seasonal epidemics. The exploration of molecular biology and reverse genetics of IBV is pivotal for understanding its replication, pathogenesis, and evolution. Reverse genetics empowers us to purposefully alter the viral genome, engineer precise genetic modifications, and unveil the secrets of virulence and resistance mechanisms. It helps us in quickly analyzing new virus strains by viral genome manipulation and the development of innovative influenza vaccines. Reverse genetics has been employed to create mutant or reassortant influenza viruses for evaluating their virulence, pathogenicity, host range, and transmissibility. Without this technique, these tasks would be difficult or impossible, making it crucial for preparing for epidemics and protecting public health. Here, we bring together the latest information on how we can manipulate the genes of the influenza B virus using reverse genetics methods, most importantly helper virus-independent techniques.
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Affiliation(s)
- Ghayyas Ud Din
- CAS Key Laboratory of Molecular Virology & Immunology, Institutional Center for Shared Technologies and Facilities, Pathogen Discovery and Big Data Platform, Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, No. 320 Yueyang Road, Shanghai, 200031, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Chunchen Wu
- Department of Laboratory Medicine, Maternal and Child Health Hospital of Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430070, People's Republic of China
| | - Zahra Tariq
- Sundas Molecular Analysis Center, Sundas Foundation, Gujranwala, Punjab, Pakistan
| | - Kinza Hasham
- Sundas Molecular Analysis Center, Sundas Foundation, Gujranwala, Punjab, Pakistan
| | - Muhammad Nabeel Amjad
- CAS Key Laboratory of Molecular Virology & Immunology, Institutional Center for Shared Technologies and Facilities, Pathogen Discovery and Big Data Platform, Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, No. 320 Yueyang Road, Shanghai, 200031, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Bei Shen
- CAS Key Laboratory of Molecular Virology & Immunology, Institutional Center for Shared Technologies and Facilities, Pathogen Discovery and Big Data Platform, Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, No. 320 Yueyang Road, Shanghai, 200031, China
| | - Lihuan Yue
- CAS Key Laboratory of Molecular Virology & Immunology, Institutional Center for Shared Technologies and Facilities, Pathogen Discovery and Big Data Platform, Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, No. 320 Yueyang Road, Shanghai, 200031, China
| | - Muhammad Asif Raza
- CAS Key Laboratory of Molecular Virology & Immunology, Institutional Center for Shared Technologies and Facilities, Pathogen Discovery and Big Data Platform, Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, No. 320 Yueyang Road, Shanghai, 200031, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Muhammad Awais Ashraf
- CAS Key Laboratory of Molecular Virology & Immunology, Institutional Center for Shared Technologies and Facilities, Pathogen Discovery and Big Data Platform, Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, No. 320 Yueyang Road, Shanghai, 200031, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Lingdie Chen
- CAS Key Laboratory of Molecular Virology & Immunology, Institutional Center for Shared Technologies and Facilities, Pathogen Discovery and Big Data Platform, Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, No. 320 Yueyang Road, Shanghai, 200031, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Yihong Hu
- CAS Key Laboratory of Molecular Virology & Immunology, Institutional Center for Shared Technologies and Facilities, Pathogen Discovery and Big Data Platform, Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, No. 320 Yueyang Road, Shanghai, 200031, China.
- University of Chinese Academy of Sciences, Beijing, China.
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3
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Caceres CJ, Gay LC, Faccin FC, Pérez DR. Use of Reverse Genetics for the Generation of Recombinant Influenza Viruses Carrying Nanoluciferase. Methods Mol Biol 2024; 2733:47-74. [PMID: 38064026 DOI: 10.1007/978-1-0716-3533-9_4] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2023]
Abstract
Influenza A (FLUAV) and influenza B (FLUBV) viruses are human and/or animal pathogens widely studied due to their importance to public health and animal production. Both FLUAV and FLUBV possess a genome composed of eight viral gene segments. For reverse genetics of influenza viruses, transcription of the mRNA for the viral proteins is typically done from a plasmid encoding an RNA polymerase II (pol II) promoter element upstream of cloned viral cDNA and expressed like host mRNA. On the other side, the synthesis of the negative-sense, single-stranded, uncapped vRNAs can be accomplished by the host's RNA polymerase I (pol I). The reverse genetics for influenza has allowed the manipulation of influenza genomes incorporating heterogeneous sequences into different segments of the influenza genome, such as reporter genes. In this chapter, we outline the protocol from the generation of reverse genetic plasmid that can be applied for the cloning of any of the segments of FLUAV or FLUBV. Furthermore, we describe a protocol for generating FLUAV or FLUBV recombinant viruses carrying Nanoluciferase (NLuc) in the PB1 gene using reverse genetics. Finally, we delineate a microneutralization protocol using FLUAV-NLuc or FLUBV-NLuc viruses optimized for the use of antibodies from different sources (mice, ferrets, avian, etc.), which provides a more sensitive, reliable, and avidity-independent method to assess the presence of neutralizing antibodies against FLUAV or FLUBV.
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Affiliation(s)
- C Joaquin Caceres
- Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, GA, USA.
| | - L Claire Gay
- Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, GA, USA
| | - Flavio Cargnin Faccin
- Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, GA, USA
| | - Daniel R Pérez
- Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, GA, USA.
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Emami A, Pirbonyeh N, Moattari A, Javanmardi F. A decade genetic diversity in Circulating influenza B virus in Iran (2010-2019): Divergence from WHO-recommended vaccine strains. Vopr Virusol 2023; 68:385-393. [PMID: 38156573 DOI: 10.36233/0507-4088-180] [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: 06/17/2023] [Revised: 10/15/2023] [Indexed: 12/30/2023]
Abstract
BACKGROUND Data on the disease burden and circulation patterns of influenza B virus lineages for Iran are limited. OBJECTIVE This review aims to describe the pattern of influenza B occurrence in Iran, comparing it with the proposed vaccine strains and determining the match and mismatch with the prescribed vaccine annually. METHODS Various sources were used to retrieve information of the data; such as information from an online search of databases such as FluNet, GISAID, and NCBI. After extracting protein sequence records in GISAID, sequence alignment with vaccine strain and construction of a phylogenetic tree were performed. Subsequently, categories of the registered circulating strains were evaluated for matching with the vaccine strains. RESULTS Of the total registered influenza-positive samples, 20.21% were related to influenza B virus. The phylogenic tree was designed based on 43 samples registered in the GISAID database; 76.74 and 23.25% sequences were of Yamagata and Victoria lineages, respectively. The most prevalent influenza B virus strains circulating during the study years belonged to the Yamagata lineage. In general, the match of the influenza B virus predominant circulating strains with administrated vaccines was observed in Iran. However, a high level of mismatch between the vaccine strain and Iranian isolates was identified in 2016‒2017. CONCLUSION The review of match and mismatch in influenza vaccine in order to improve the composition of the prescribed vaccine in each region is very important because the vaccine efficacy decreased when the strain included in vaccine did not match the circulating epidemic strain.
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Affiliation(s)
- A Emami
- Shiraz University of medical sciences
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5
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Wilson JL, Akin E, Zhou R, Jedlicka A, Dziedzic A, Liu H, Fenstermacher KZJ, Rothman RE, Pekosz A. The Influenza B Virus Victoria and Yamagata Lineages Display Distinct Cell Tropism and Infection-Induced Host Gene Expression in Human Nasal Epithelial Cell Cultures. Viruses 2023; 15:1956. [PMID: 37766362 PMCID: PMC10537232 DOI: 10.3390/v15091956] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 09/11/2023] [Accepted: 09/12/2023] [Indexed: 09/29/2023] Open
Abstract
Understanding Influenza B virus infections is of critical importance in our efforts to control severe influenza and influenza-related diseases. Until 2020, two genetic lineages of influenza B virus-Yamagata and Victoria-circulated in the population. These lineages are antigenically distinct, but the differences in virus replication or the induction of host cell responses after infection have not been carefully studied. Recent IBV clinical isolates of both lineages were obtained from influenza surveillance efforts of the Johns Hopkins Center of Excellence in Influenza Research and Response and characterized in vitro. B/Victoria and B/Yamagata clinical isolates were recognized less efficiently by serum from influenza-vaccinated individuals in comparison to the vaccine strains. B/Victoria lineages formed smaller plaques on MDCK cells compared to B/Yamagata, but infectious virus production in primary human nasal epithelial cell (hNEC) cultures showed no differences. While ciliated epithelial cells were the dominant cell type infected by both lineages, B/Victoria lineages had a slight preference for MUC5AC-positive cells, and B/Yamagata lineages infected more basal cells. Finally, while both lineages induced a strong interferon response 48 h after infection of hNEC cultures, the B/Victoria lineages showed a much stronger induction of interferon-related signaling pathways compared to B/Yamagata. This demonstrates that the two influenza B virus lineages differ not only in their antigenic structure but also in their ability to induce host innate immune responses.
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Affiliation(s)
- Jo L. Wilson
- W. Harry Feinstone, Department of Molecular Microbiology and Immunology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD 21205, USA; (J.L.W.); (E.A.); (R.Z.); (A.J.); (A.D.); (H.L.)
- Division of Allergy, Immunology, and Rheumatology, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Elgin Akin
- W. Harry Feinstone, Department of Molecular Microbiology and Immunology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD 21205, USA; (J.L.W.); (E.A.); (R.Z.); (A.J.); (A.D.); (H.L.)
| | - Ruifeng Zhou
- W. Harry Feinstone, Department of Molecular Microbiology and Immunology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD 21205, USA; (J.L.W.); (E.A.); (R.Z.); (A.J.); (A.D.); (H.L.)
| | - Anne Jedlicka
- W. Harry Feinstone, Department of Molecular Microbiology and Immunology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD 21205, USA; (J.L.W.); (E.A.); (R.Z.); (A.J.); (A.D.); (H.L.)
| | - Amanda Dziedzic
- W. Harry Feinstone, Department of Molecular Microbiology and Immunology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD 21205, USA; (J.L.W.); (E.A.); (R.Z.); (A.J.); (A.D.); (H.L.)
| | - Hsuan Liu
- W. Harry Feinstone, Department of Molecular Microbiology and Immunology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD 21205, USA; (J.L.W.); (E.A.); (R.Z.); (A.J.); (A.D.); (H.L.)
| | - Katherine Z. J. Fenstermacher
- Department of Emergency Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA; (K.Z.J.F.); (R.E.R.)
| | - Richard E. Rothman
- Department of Emergency Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA; (K.Z.J.F.); (R.E.R.)
| | - Andrew Pekosz
- W. Harry Feinstone, Department of Molecular Microbiology and Immunology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD 21205, USA; (J.L.W.); (E.A.); (R.Z.); (A.J.); (A.D.); (H.L.)
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6
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Wilson JL, Akin E, Zhou R, Jedlicka A, Dziedzic A, Liu H, Fenstermacher KZ, Rothman R, Pekosz A. The Influenza B Virus Victoria and Yamagata Lineages Display Distinct Cell Tropism and Infection Induced Host Gene Expression in Human Nasal Epithelial Cell Cultures. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.08.04.551980. [PMID: 37577630 PMCID: PMC10418153 DOI: 10.1101/2023.08.04.551980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/15/2023]
Abstract
Understanding Influenza B virus infections is of critical importance in our efforts to control severe influenza and influenza-related disease. Until 2020, two genetic lineages of influenza B virus - Yamagata and Victoria - circulated in the population. These lineages are antigenically distinct but differences in virus replication or the induction of host cell responses after infection have not been carefully studied. Recent IBV clinical isolates of both lineages were obtained from influenza surveillance efforts of the Johns Hopkins Center of Excellence in Influenza Research and Response and characterized in vitro . B/Victoria and B/Yamagata clinical isolates were recognized less efficiently by serum from influenza-vaccinated individuals in comparison to the vaccine strains. B/Victoria lineages formed smaller plaques on MDCK cells compared to B/Yamagata, but infectious virus production in primary human nasal epithelial cell (hNEC) cultures showed no differences. While ciliated epithelial cells were the dominant cell type infected by both lineages, B/Victoria lineages had a slight preference for MUC5AC-positive cells, while B/Yamagata lineages infected more basal cells. Finally, while both lineages induced a strong interferon response 48 hours after infection of hNEC cultures, the B/Victoria lineages showed a much stronger induction of interferon related signaling pathways compared to B/Yamagata. This demonstrates that the two influenza B virus lineages differ not only in their antigenic structure but in their ability to induce host innate immune responses.
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Affiliation(s)
- Jo L Wilson
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD, United States
- Department of Pediatric Allergy and Immunology, Johns Hopkins Hospital, Baltimore, MD, United States
| | - Elgin Akin
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD, United States
| | - Ruifeng Zhou
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD, United States
| | - Anne Jedlicka
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD, United States
| | - Amanda Dziedzic
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD, United States
| | - Hsuan Liu
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD, United States
| | | | - Richard Rothman
- Adult Emergency Department, Johns Hopkins Hospital, Baltimore, MD, United States
| | - Andrew Pekosz
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD, United States
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Kaveh K, Tazarghi A, Hosseini P, Fotouhi F, Ajorloo M, Rabiei Roodsari M, Razavi Nikoo H. Molecular characterization of the neuraminidase gene of influenza B virus in Northern Iran. Virusdisease 2023; 34:21-28. [PMID: 37009253 PMCID: PMC10050514 DOI: 10.1007/s13337-022-00806-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 12/28/2022] [Indexed: 02/19/2023] Open
Abstract
Neuraminidase inhibitors are the only FDA-approved class of antiviral agents against influenza B viruses. Resistance to these drugs has been reported from different parts of the world; however, there seems to be not enough information about this issue in Iran. We aimed to study the genetic evolution of these viruses as well as the presence of possible mutations concerning drug resistance in northern Iran. RNA was extracted from naso- and oropharyngeal swabs and amplified by one-step RT-PCR for detection and sequencing of the neuraminidase gene. All the data were edited and assembled utilizing BioEdit DNASequence Alignment Editor Software, and the phylogenetic tree was constructed via MEGA software version 10. Finally, resistance-associated mutations and B-cell epitopes substitutions were assessed by comparing our sequences with the counterparts in the reference strains. Comparing our sequences with reference strains revealed that the analyzed isolates of influenza B pertained to the B-Yamagata lineage, had a few B-cell epitopes alterations, and contained no particular mutations concerning resistance against neuraminidase inhibitors, such as oseltamivir. Our findings suggest that all the strains circulating in northern Iran and hopefully other parts of the country can be considered sensitive to this class of drugs. Although it is promising, we strongly recommend additional investigations to evaluate the impact of such drug-resistant mutations in other regions, which in turn will assist the public health agencies in taking immediate and effective therapeutic measures into account when needed.
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Affiliation(s)
- Kimia Kaveh
- Department of Microbiology, Faculty of Medicine, Golestan University of Medical Sciences, Gorgan, Iran
| | - Abbas Tazarghi
- Department of Microbiology, Faculty of Medicine, Golestan University of Medical Sciences, Gorgan, Iran
| | - Parastoo Hosseini
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Fatemeh Fotouhi
- Influenza Research Lab, Department of Virology, Pasteur Institute of Iran, Tehran, Iran
| | - Mehdi Ajorloo
- Blood Transfusion Research Center, High Institute of Research and Education in Transfusion Medicine, Tehran, Iran
| | - Mehdi Rabiei Roodsari
- Department of Microbiology, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
| | - Hadi Razavi Nikoo
- Department of Microbiology, Faculty of Medicine, Golestan University of Medical Sciences, Gorgan, Iran
- Infectious Disease Research Center, Golestan University of Medical Sciences, Gorgan, Iran
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8
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Aslam S, Rajendran M, Kriti D, Kurland A, Johnson J, van Bakel H, Krammer F, García-Sastre A, Ayllon J. Generation of a high yield vaccine backbone for influenza B virus in embryonated chicken eggs. NPJ Vaccines 2023; 8:12. [PMID: 36765053 PMCID: PMC9911942 DOI: 10.1038/s41541-023-00603-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Accepted: 01/17/2023] [Indexed: 02/12/2023] Open
Abstract
Influenza B virus (IBV) strains are one of the components of seasonal influenza vaccines in both trivalent and quadrivalent formulations. The vast majority of these vaccines are produced in embryonated chickens' eggs. While optimized backbones for vaccine production in eggs exist and are in use for influenza A viruses, no such backbones exist for IBVs, resulting in unpredictable production yields. To generate an optimal vaccine seed virus backbone, we have compiled a panel of 71 IBV strains from 1940 to present day, representing the known temporal and genetic variability of IBV circulating in humans. This panel contains strains from the B/Victoria/2/87-like lineage, B/Yamagata/16/88-like lineage and the ancestral lineage that preceded their split to provide a diverse set that would help to identify a suitable backbone which can be used in combination with hemagglutinin (HA) and neuraminidase (NA) glycoproteins from any IBV strain to be incorporated into the seasonal vaccine. We have characterized and ranked the growth profiles of the 71 IBV strains and the best performing strains were used for co-infection of eggs, followed by serial passaging to select for high-growth reassortant viruses. After serial passaging, we selected 10 clonal isolates based on their growth profiles assessed by hemagglutination and plaque-forming units. We then generated reverse genetics systems for the three clones that performed best in growth curves. The selected backbones were then used to generate different reassortant viruses with HA/NA combinations from high and low titer yielding wild type IBV. When the growth profiles of the recombinant reassortant viruses were tested, the low titer yielding HA/NA viruses with the selected backbones yielded higher titers similar to those from high titer yielding HA/NA combinations. The use of these IBV backbones with improved replication in eggs might increase yields for the influenza B virus components of seasonal influenza virus vaccines.
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Affiliation(s)
- Sadaf Aslam
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
- Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
| | - Madhusudan Rajendran
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
| | - Divya Kriti
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
| | - Andrew Kurland
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
- Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
| | - Jeffrey Johnson
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
- Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
| | - Harm van Bakel
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
| | - Florian Krammer
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
- Department of Pathology, Molecular and Cell-Based Medicine, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
| | - Adolfo García-Sastre
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.
- Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.
- Department of Pathology, Molecular and Cell-Based Medicine, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.
- Department of Medicine, Division of Infectious Diseases, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.
- The Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.
| | - Juan Ayllon
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.
- Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.
- Department of Health Sciences, University of Burgos, Burgos, Spain.
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Abbadi N, Mousa JJ. Broadly Protective Neuraminidase-Based Influenza Vaccines and Monoclonal Antibodies: Target Epitopes and Mechanisms of Action. Viruses 2023; 15:200. [PMID: 36680239 PMCID: PMC9861061 DOI: 10.3390/v15010200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 12/31/2022] [Accepted: 01/04/2023] [Indexed: 01/13/2023] Open
Abstract
Neuraminidase (NA) is an important surface protein on influenza virions, playing an essential role in the viral life cycle and being a key target of the immune system. Despite the importance of NA-based immunity, current vaccines are focused on the hemagglutinin (HA) protein as the target for protective antibodies, and the amount of NA is not standardized in virion-based vaccines. Antibodies targeting NA are predominantly protective, reducing infection severity and viral shedding. Recently, NA-specific monoclonal antibodies have been characterized, and their target epitopes have been identified. This review summarizes the characteristics of NA, NA-specific antibodies, the mechanism of NA inhibition, and the recent efforts towards developing NA-based and NA-incorporating influenza vaccines.
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Affiliation(s)
- Nada Abbadi
- Center for Vaccines and Immunology, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, USA
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, USA
| | - Jarrod J. Mousa
- Center for Vaccines and Immunology, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, USA
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, USA
- Department of Biochemistry and Molecular Biology, Franklin College of Arts and Sciences, University of Georgia, Athens, GA 30602, USA
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10
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Influenza B Virus (IBV) Immune-Mediated Disease in C57BL/6 Mice. Vaccines (Basel) 2022; 10:vaccines10091440. [PMID: 36146518 PMCID: PMC9504307 DOI: 10.3390/vaccines10091440] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 08/27/2022] [Accepted: 08/29/2022] [Indexed: 11/16/2022] Open
Abstract
Influenza B viruses (IBV) primarily infect humans, causing seasonal epidemics. The absence of an animal reservoir limits pandemic concern, but IBV infections may cause severe respiratory disease, predominantly in young children and the elderly. The IBV disease burden is largely controlled by seasonal influenza vaccination; however, immunity due to vaccination is sometimes incomplete, a feature linked to antigenic mismatches. Thus, understanding the features that contribute to disease pathogenesis is important, particularly immune-mediated versus virus-mediated outcomes. Unexpectedly, C57BL/6 (B6) mice intranasally infected with a low multiplicity of infection of B/Florida/04/2006 developed substantial morbidity and mortality. To address the cause, B6 mice were treated daily with dexamethasone to dampen the immune and pro-inflammatory response to IBV infection, allowing the determination of whether the responses were immune- and/or virus-associated. As expected, dexamethasone (DEX)-treated mice had a lower pro-inflammatory response and reduced lung pathology despite the presence of high viral lung titers, but mortality was comparable to PBS-treated mice, indicating that mortality may be linked to lung virus replication. The results showed that the immune response to IBV is the major cause of morbidity, mortality, lung pathology, and viral clearance. Importantly, the results suggest that a robust lung CTL response and associated leukocyte influx contribute to disease.
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11
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A Single Mutation in the Cryptic AUG (cAUG) Affects In Vitro Translation and Replication Efficiencies and In Vivo Virulence of Coxsackievirus B3 (CVB3). Curr Microbiol 2022; 79:288. [PMID: 35972696 DOI: 10.1007/s00284-022-02986-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 07/25/2022] [Indexed: 11/03/2022]
Abstract
The 5'UTR of the genomic RNA of CVB3, unusually long and rich on highly structured secondary structure, contains a conserved cis acting RNA element named the cryptic AUG (cAUG), where the cellular 48S complex is formed. In this study, we investigate the role of this cAUG in CVB3 translation, replication, and virulence. Mutant viral sub-genomic replicon RNA was constructed by site-directed mutagenesis. We characterize in vitro translation and replication efficiencies and in vivo virulence of a cAUG mutant in comparison with wild-type strain. UV-cross-linking assay and Real-Time PCR were used, respectively, to detect binding host proteins and to quantify viral production. Secondary structures of domain containing the cAUG site were studied and compared. The results suggest that introduced mutation in the CVB3 5'UTR affects in vitro and ex vivo viral translation which cannot be rescued by compensatory mutations. A reduced interaction of the La and PCBP2 translation initiation factors with cAUG residue of mutant was revealed. Decreasing production of viral mutant RNA was also demonstrated. Furthermore, secondary structure prediction reveals changes in the ribosome binding sites of the cAUG moiety of mutant sense strand RNA and no alterations in the structure of wild type, suggesting that cAUG mutation specifically affects the secondary structure of the sense RNA strand. Taken together, AUG integrity influences the efficiency of ribosome recruitment through IRES element and the capacity of replication.
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12
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Silva LR, da Silva-Júnior EF. Multi-Target Approaches of Epigallocatechin-3-O-gallate (EGCG) and its Derivatives Against Influenza Viruses. Curr Top Med Chem 2022; 22:1485-1500. [PMID: 35086449 DOI: 10.2174/1568026622666220127112056] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2021] [Revised: 12/13/2021] [Accepted: 12/30/2021] [Indexed: 11/22/2022]
Abstract
Influenza viruses (INFV), Orthomyxoviridae family, are mainly transmitted among humans, via aerosols or droplets from the respiratory secretions. However, fomites could be a potential transmission pathway. Annually, seasonal INFV infections account for 290-650 thousand deaths worldwide. Currently, there are two classes of approved drugs to treat INFV infections, being neuraminidase (NA) inhibitors and blockers of matrix-2 (M2) ion channel. However, cases of resistance have been observed for both chemical classes, reducing the efficacy of treatment. The emergence of influenza outbreaks and pandemics calls for new antiviral molecules more effective and that could overcome the current resistance to anti-influenza drugs. In this context, polyphenolic compounds are found in various plants and these have displayed different multi-target approaches against diverse pathogens. Among these, green tea (Camellia sinensis) catechins, in special epigallocatechin-3-O-gallate (EGCG), have demonstrated significant activities against the two most relevant human INFV, subtypes A and lineages B. In this sense, EGCG has been found a promising multi-target agent against INFV since can act inhibiting NA, hemagglutination (HA), RNA-dependent RNA polymerase (RdRp), and viral entry/adsorption. In general, the lack of knowledge about potential multi-target natural products prevents an adequate exploration of them, increasing the time for developing multi-target drugs. Then, this review aimed to compile to most relevant studies showing the anti-INFV effects of EGCG and its derivatives, which could become antiviral drug prototypes in the future.
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Affiliation(s)
- Leandro Rocha Silva
- Institute of Chemistry and Biotechnology, Federal University of Alagoas, Melo Mota Avenue, 57072-970, AC Simões campus, Maceió, Brazil
| | - Edeildo Ferreira da Silva-Júnior
- Institute of Chemistry and Biotechnology, Federal University of Alagoas, Melo Mota Avenue, 57072-970, AC Simões campus, Maceió, Brazil
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13
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Seibert B, Cardenas-Garcia S, Rajao D, Perez DR. Reverse Genetics for Influenza A and B Viruses Driven by Swine Polymerase I Promoter. Methods Mol Biol 2022; 2465:257-281. [PMID: 35118626 DOI: 10.1007/978-1-0716-2168-4_14] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Influenza viruses are considered prominent pathogens of humans and animals that are extensively investigated because of public health importance. Plasmid-based reverse genetics is a fundamental tool that facilitates the generation of genetically modified viruses from a cDNA copy. The ability to rescue viruses enables researchers to understand different biological characteristics including IV replication, pathogenesis, and transmission. Furthermore, understanding the biology and ability to manipulate different aspects of the virus can aid in providing a better understanding of the mechanisms of antiviral resistance and development of alternative vaccination strategies. This chapter describes the process of cloning cDNA copies of IAV and IBV RNA segments into a swine polymerase-driven reverse genetics plasmid vector, successful generation of recombinant IVs in swine cells, and propagation of virus in cells or eggs. The swine polymerase reverse genetics system was previously shown to be efficient for de novo rescue of human-, swine-, and avian-origin IAVs and IBV in swine and human origin cell lines utilizing the same protocols discussed in this chapter.
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Affiliation(s)
- Brittany Seibert
- Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, GA, USA
| | - Stivalis Cardenas-Garcia
- Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, GA, USA
| | - Daniela Rajao
- Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, GA, USA
| | - Daniel R Perez
- Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, GA, USA.
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14
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Dufrasne F. Baloxavir Marboxil: An Original New Drug against Influenza. Pharmaceuticals (Basel) 2021; 15:28. [PMID: 35056085 PMCID: PMC8779813 DOI: 10.3390/ph15010028] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 12/19/2021] [Accepted: 12/22/2021] [Indexed: 11/16/2022] Open
Abstract
Baloxavir marboxil is a new drug developed in Japan by Shionogi to treat seasonal flu infection. This cap-dependent endonuclease inhibitor is a prodrug that releases the biologically active baloxavir acid. This new medicine has been marketed in Japan, the USA and Europe. It is well tolerated (more than 1% of the patients experienced diarrhea, bronchitis, nausea, nasopharyngitis, and headache), and both influenza A and B viruses are sensitive, although the B strain is more resistant due to variations in the amino acid residues in the binding site. The drug is now in post-marketing pharmacovigilance phase, and its interest will be especially re-evaluated in the future during the annual flu outbreaks. It has been also introduced in a recent clinical trial against COVID-19 with favipiravir.
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Affiliation(s)
- François Dufrasne
- Unité de Microbiologie, Chimie Bioorganique et Macromoléculaire, Département de Recherche et Développement du Médicament, Faculté de Pharmacie, Campus Plaine CP 205/5, Université Libre de Bruxelles, 1050 Brussels, Belgium
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15
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Macintyre AN, French MJ, Sanders BR, Riebe KJ, Shterev ID, Wiehe K, Hora B, Evangelous T, Dugan G, Bourland JD, Cline JM, Sempowski GD. Long-Term Recovery of the Adaptive Immune System in Rhesus Macaques After Total Body Irradiation. Adv Radiat Oncol 2021; 6:100677. [PMID: 34646962 PMCID: PMC8498734 DOI: 10.1016/j.adro.2021.100677] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 12/14/2020] [Accepted: 01/30/2021] [Indexed: 12/15/2022] Open
Abstract
PURPOSE Ionizing radiation causes acute damage to hematopoietic and immune cells, but the long-term immunologic consequences of irradiation are poorly understood. We therefore performed a prospective study of the delayed immune effects of radiation using a rhesus macaque model. METHODS AND MATERIALS Ten macaques received 4 Gy high-energy x-ray total body irradiation (TBI) and 6 control animals received sham irradiation. TBI caused transient lymphopenia that resolved over several weeks. Once white blood cell counts recovered, flow cytometry was used to immunophenotype the circulating adaptive immune cell populations 4, 9, and 21 months after TBI. Data were fit using a mixed-effects model to determine age-dependent, radiation-dependent, and interacting effects. T cell receptor (TCR) sequencing and quantification of TCR Excision Circles were used to determine relative contributions of thymopoiesis and peripheral expansion to T cell repopulation. Two years after TBI, the cohort was vaccinated with a 23-valent pneumococcal polysaccharide vaccine and a tetravalent influenza hemagglutinin vaccine. RESULTS Aging, but not TBI, led to significant changes in the frequencies of dendritic cells, CD4 and CD8 T cells, and B cells. However, irradiated animals exhibited increased frequencies of central memory T cells and decreased frequencies of naïve T cells. These consequences of irradiation were time-dependent and more prolonged in the CD8 T cell population. Irradiation led to transient increases in CD8+ T cell TCR Excision Circles and had no significant effect on TCR sequence entropy, indicating T cell recovery was partially mediated by thymopoiesis. Animals that were irradiated and then vaccinated showed normal immunoglobulin G binding and influenza neutralization titers in response to the 4 protein antigens but weaker immunoglobulin G binding titers to 10 of the 23 polysaccharide antigens. CONCLUSIONS These findings indicate that TBI causes subtle but long-lasting immune defects that are evident years after recovery from lymphopenia.
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Affiliation(s)
- Andrew N. Macintyre
- Duke Human Vaccine Institute and Department of Medicine, Duke University School of Medicine, Durham, North Carolina
| | - Matthew J. French
- Duke Human Vaccine Institute and Department of Medicine, Duke University School of Medicine, Durham, North Carolina
| | - Brittany R. Sanders
- Duke Human Vaccine Institute and Department of Medicine, Duke University School of Medicine, Durham, North Carolina
| | - Kristina J. Riebe
- Duke Human Vaccine Institute and Department of Medicine, Duke University School of Medicine, Durham, North Carolina
| | - Ivo D. Shterev
- Duke Human Vaccine Institute and Department of Medicine, Duke University School of Medicine, Durham, North Carolina
| | - Kevin Wiehe
- Duke Human Vaccine Institute and Department of Medicine, Duke University School of Medicine, Durham, North Carolina
| | - Bhavna Hora
- Duke Human Vaccine Institute and Department of Medicine, Duke University School of Medicine, Durham, North Carolina
| | - Tyler Evangelous
- Duke Human Vaccine Institute and Department of Medicine, Duke University School of Medicine, Durham, North Carolina
| | - Greg Dugan
- Department of Pathology/Comparative Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina
| | - J. Daniel Bourland
- Department of Radiation Oncology, Wake Forest University School of Medicine, Winston-Salem, North Carolina
| | - J. Mark Cline
- Department of Pathology/Comparative Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina
| | - Gregory D. Sempowski
- Duke Human Vaccine Institute and Department of Medicine, Duke University School of Medicine, Durham, North Carolina
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16
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Zhou L, Feng Z, Liu J, Chen Y, Yang L, Liu S, Li X, Gao R, Zhu W, Wang D, Shu Y. A single N342D substitution in Influenza B Virus NA protein determines viral pathogenicity in mice. Emerg Microbes Infect 2021; 9:1853-1863. [PMID: 32746754 PMCID: PMC7473139 DOI: 10.1080/22221751.2020.1806005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Influenza B virus (IBV) is one of the most important human respiratory viruses: it causes approximately one-third of the global influenza-related disease burden each year. However, compared with the several pathogenicity-related molecular markers that have been identified for influenza A virus (IAV), little is known about potential IBV pathogenicity-related markers. Here, although the IBV strain B/Anhui-Tunxi/1528/2014 (AH1528/14) exhibited a more efficient replication ability in vitro and higher pathogenicity in vivo compared with IBV strain B/Anhui-Baohe/127/2015 (AH127/15), only three amino acids differences (HAA390E, NAN342D and PB1V212I) were observed among their full genomes. The contributions of each amino acid difference to the virus pathogenicity were further investigated. Compared with the wild type IBV virus rAH127, the recombinant virus harbouring a single substitution of HAA390E had a similar phenotype, whereas the recombinant virus harbouring PB1V212I replicated to a moderately higher titre in both MDCK cells and in mice. Notably, the virus harbouring NAN342D showed significantly better growth properties in MDCK cells and higher fatality rates in mice. In addition, the presence of NAN342D dramatically enhanced the viral neuraminidase activity. In conclusion, our study identified a novel IBV molecular marker, NAN342D, that could significantly increase the virulence of IBV in mice.
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Affiliation(s)
- Lijuan Zhou
- School of Public Health (Shenzhen), Sun Yat-sen University, Guangdong, People's Republic of China.,National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, People's Republic of China
| | - Zhaomin Feng
- National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, People's Republic of China
| | - Jia Liu
- National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, People's Republic of China
| | - Yongkun Chen
- School of Public Health (Shenzhen), Sun Yat-sen University, Guangdong, People's Republic of China
| | - Lei Yang
- National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, People's Republic of China
| | - Suli Liu
- School of Public Health (Shenzhen), Sun Yat-sen University, Guangdong, People's Republic of China
| | - Xiyan Li
- National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, People's Republic of China
| | - Rongbao Gao
- National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, People's Republic of China
| | - Wenfei Zhu
- National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, People's Republic of China
| | - Dayan Wang
- National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, People's Republic of China
| | - Yuelong Shu
- School of Public Health (Shenzhen), Sun Yat-sen University, Guangdong, People's Republic of China.,National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, People's Republic of China
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17
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Cardenas-Garcia S, Caceres CJ, Rajao D, Perez DR. Reverse genetics for influenza B viruses and recent advances in vaccine development. Curr Opin Virol 2020; 44:191-202. [PMID: 33254031 PMCID: PMC8693393 DOI: 10.1016/j.coviro.2020.10.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2020] [Revised: 10/23/2020] [Accepted: 10/25/2020] [Indexed: 02/06/2023]
Abstract
Influenza B virus is a respiratory pathogen that affects more severely the pediatric and elderly populations. There are two lineages of influenza B virus that seem to have differential predilection for age groups. Both lineages can co-circulate during the influenza season however one is usually more prominent than the other depending on the season. There are no defined indicators to predict which lineage will dominate in any given season. In recent years, the addition of viruses from both lineages to the seasonal influenza vaccine formulation has improved vaccine protection, although quadrivalent vaccines are not available worldwide. Reverse genetics has facilitated advancements in the field of vaccine development against influenza B virus. Different strategies have been explored showing promising results that could potentially lead to the development broadly protective influenza B virus vaccines.
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Affiliation(s)
- Stivalis Cardenas-Garcia
- Poultry Diagnostic and Research Center, Department of Population Health, College of Veterinary Medicine, University of Georgia, 953 College Station Rd, Athens, GA, 30602, USA.
| | - C Joaquin Caceres
- Poultry Diagnostic and Research Center, Department of Population Health, College of Veterinary Medicine, University of Georgia, 953 College Station Rd, Athens, GA, 30602, USA
| | - Daniela Rajao
- Poultry Diagnostic and Research Center, Department of Population Health, College of Veterinary Medicine, University of Georgia, 953 College Station Rd, Athens, GA, 30602, USA
| | - Daniel R Perez
- Poultry Diagnostic and Research Center, Department of Population Health, College of Veterinary Medicine, University of Georgia, 953 College Station Rd, Athens, GA, 30602, USA.
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18
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Lianhua-Qingwen Displays Antiviral and Anti-Inflammatory Activity and Synergistic Effects with Oseltamivir against Influenza B Virus Infection in the Mouse Model. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2020; 2020:3196375. [PMID: 32565852 PMCID: PMC7293728 DOI: 10.1155/2020/3196375] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2019] [Revised: 04/20/2020] [Accepted: 04/27/2020] [Indexed: 12/17/2022]
Abstract
Influenza B virus (IBV) is one of the main pathogens of the annual influenza epidemic, and the disease burden is significant, especially among children and young teenagers. In this study, the antiviral and anti-inflammatory effects of a traditional Chinese medicine prescription, the Lianhua-Qingwen capsule, were evaluated. Our results showed that Lianhua-Qingwen capsule can inhibit both Victoria and Yamagata lineages, and the 50% inhibitive concentrations ranged from 0.228 ± 0.150 to 0.754 ± 0.161 mg/mL. The time course results demonstrated that IBV yields were reduced with treatment at 0–4 h after infection, and the mechanistic research verified that Lianhua-Qingwen capsule has hemagglutination inhibition activity against B/Guangzhou/0215/2012 but not A/California/04/2009. In addition to antiviral activity, Lianhua-Qingwen capsule can also inhibit excessive expression of RANTES, IL-6, IL-8, IP-10, TNF-α, MCP-1, MIP-1β, and IFN-λ at the mRNA level and prevent a severe inflammatory response. The in vivo results confirmed that orally administered Lianhua-Qingwen capsule (100–400 mg/kg/day) does not reduce IBV-induced lung viral load and mortality in mice. However, the pathological change in lungs was alleviated, and there were fewer inflammatory cells in the lungs of Lianhua-Qingwen capsule treated mice than those in controls. Further research confirmed that the combination treatment of 200 mg/kg/day of Lianhua-Qingwen capsule with 2 mg/kg/day of oseltamivir significantly reduced IBV infection over the individual administration of either alone in vivo. Our findings prove that Lianhua-Qingwen capsule could be used as an assistant medicine to enhance the effect of oseltamivir against influenza B virus infection.
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19
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Mathew NR, Angeletti D. Recombinant Influenza Vaccines: Saviors to Overcome Immunodominance. Front Immunol 2020; 10:2997. [PMID: 31998299 PMCID: PMC6966699 DOI: 10.3389/fimmu.2019.02997] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Accepted: 12/06/2019] [Indexed: 11/24/2022] Open
Abstract
It has been almost a decade since the 2009 influenza A virus pandemic hit the globe causing significant morbidity and mortality. Nonetheless, annual influenza vaccination, which elicits antibodies mainly against the head region of influenza hemagglutinin (HA), remains as the mainstay to combat and reduce symptoms of influenza infection. Influenza HA is highly antigenically variable, thus limiting vaccine efficacy. In addition, the variable HA head occupies the upper strata of the immunodominance hierarchy, thereby clouding the antibody response toward subdominant epitopes, which are usually conserved across different influenza strains. Isolation of monoclonal antibodies from individuals recognizing such epitopes has facilitated the development of recombinant vaccines that focus the adaptive immune response toward conserved, protective targets. Here, we review some significant leaps in recombinant vaccine development, which could possibly help to overcome B cell and antibody immunodominance and provide heterosubtypic immunity to influenza A virus.
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Affiliation(s)
- Nimitha R Mathew
- Department of Microbiology and Immunology, Institute of Biomedicine, University of Gothenburg, Gothenburg, Sweden
| | - Davide Angeletti
- Department of Microbiology and Immunology, Institute of Biomedicine, University of Gothenburg, Gothenburg, Sweden
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20
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Bauer DLV, Tellier M, Martínez-Alonso M, Nojima T, Proudfoot NJ, Murphy S, Fodor E. Influenza Virus Mounts a Two-Pronged Attack on Host RNA Polymerase II Transcription. Cell Rep 2019; 23:2119-2129.e3. [PMID: 29768209 PMCID: PMC5972227 DOI: 10.1016/j.celrep.2018.04.047] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2018] [Revised: 04/03/2018] [Accepted: 04/11/2018] [Indexed: 12/24/2022] Open
Abstract
Influenza virus intimately associates with host RNA polymerase II (Pol II) and mRNA processing machinery. Here, we use mammalian native elongating transcript sequencing (mNET-seq) to examine Pol II behavior during viral infection. We show that influenza virus executes a two-pronged attack on host transcription. First, viral infection causes decreased Pol II gene occupancy downstream of transcription start sites. Second, virus-induced cellular stress leads to a catastrophic failure of Pol II termination at poly(A) sites, with transcription often continuing for tens of kilobases. Defective Pol II termination occurs independently of the ability of the viral NS1 protein to interfere with host mRNA processing. Instead, this termination defect is a common effect of diverse cellular stresses and underlies the production of previously reported downstream-of-gene transcripts (DoGs). Our work has implications for understanding not only host-virus interactions but also fundamental aspects of mammalian transcription. Influenza virus infection dysregulates host transcription Viral infection depletes Pol II from gene bodies downstream of the TSS Virus-induced stress leads to a catastrophic failure of Pol II termination Defective termination does not require viral NS1: host CPSF30 interaction
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Affiliation(s)
- David L V Bauer
- Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK.
| | - Michael Tellier
- Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK
| | - Mónica Martínez-Alonso
- Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK
| | - Takayuki Nojima
- Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK
| | - Nick J Proudfoot
- Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK
| | - Shona Murphy
- Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK
| | - Ervin Fodor
- Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK.
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21
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He G, Yang P, Yan Q, Xiong C. Debate on the compositions of influenza B in northern hemisphere seasonal influenza vaccines. Antimicrob Resist Infect Control 2019; 8:164. [PMID: 31673353 PMCID: PMC6819444 DOI: 10.1186/s13756-019-0631-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2019] [Accepted: 10/17/2019] [Indexed: 11/24/2022] Open
Abstract
Background Annual influenza vaccination is the most effective way to prevent influenza. Influenza vaccines have traditionally included the hemagglutinins (HA) and neuraminidases (NA) from the two A viruses (H1N1 and H3N2) and either B Yamagata or B Victoria. Mismatches between circulating isolates of influenza B and the vaccines are very common. Taking 2017/2018 winter in northern hemisphere as an example, this study was designed to find out the reasons for mismatch between the trivalent influenza vaccine (TIV) and most of the epidemic isolates at that time, and to discuss if there are some optimized programs for seasonal influenza vaccines. Methods HA and NA sequences of the seasonal isolates circulating from December 1, 2017 to February 28, 2018, and in the previously other 7 winters in northern hemisphere from Global Initiative on Sharing All Influenza Data (GISAID) and the influenza database of National Center for Biotechnology Information (NCBI). Phylogenetic trees and genetic distances were constructed or calculated by using MAFFT and MEGA 6.0 software. Results Influenza B composition in the TIV recommendation mismatched most of circulating viruses in 2017/2018 winter; the vaccine strain was from the B/Victoria lineage, while most of epidemic isolates were from the B/Yamagata lineage. The epidemic lineage of influenza B reached its peak a little late in the previous winter might be responsible for this mismatch. During 2010-2018, the mean genetic distances between epidemic isolates of influenza A (H1N1 and H3N2) and the vaccines were no higher than 0.02375 ± 0.00341 in both HA and NA. However, concerning influenza B virus, when forecasting done well, the mean genetic distances between epidemic isolates and the vaccines were no higher than 0.02368 ± 0.00272; otherwise, the distances could reach 0.13695 ± 0.00238. Conclusion When applying quadrivalent influenza vaccines (QIVs) for vaccination, the recommendations of compositions for influenza B could be altered and assessed once in 3 or 4 years; when economic burden was considered intensively and TIVs were utilized, the recommended compositions for influenza B could be announced in April or May, rather than in February or March as now.
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Affiliation(s)
- Guozhong He
- Institute of Health, Kunming Medical University, Kunming, 650031 China
| | - Pengfei Yang
- Huai’an Center for Disease Control and Prevention, Huai’an, 223005 China
| | - Qingli Yan
- Huai’an Center for Disease Control and Prevention, Huai’an, 223005 China
| | - Chenglong Xiong
- Department of Public Health Microbiology, School of Public Health, Fudan University, Shanghai, 200032 China
- School of Public Health, Fudan University, Key Laboratory of Public Health Safety, Ministry of Education, Shanghai, 200032 China
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22
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High-Throughput MicroRNA Profiles of Permissive Madin-Darby Canine Kidney Cell Line Infected with Influenza B Viruses. Viruses 2019; 11:v11110986. [PMID: 31717720 PMCID: PMC6893747 DOI: 10.3390/v11110986] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Revised: 10/15/2019] [Accepted: 10/23/2019] [Indexed: 12/14/2022] Open
Abstract
Victoria and Yamagata lineages of influenza B viruses are globally circulating in seasonal epidemics. Madin–Darby canine kidney (MDCK) cells are permissive for viral isolation and vaccine manufacture. Nevertheless, the interplay between influenza B viruses and host microRNAs has not been investigated in this cell line. Therefore, the present study aims at high-throughput analysis of canine microRNA profile upon infection of influenza B viruses. Briefly, MDCK cells were infected with Victoria or Yamagata lineage at MOI of 0.01. After being harvested at 6, 12 and 24 h post infection, microRNAs were subjected to high-throughput sequencing based on MiSeq platform (Illumina). The results demonstrated that five microRNAs including cfa-miR-197, cfa-miR-215, cfa-miR361, cfa-miR-1841, and cfa-miR-1842 were overexpressed in both Victoria and Yamagata lineage infections. Interestingly, computational prediction showed that karyopherin alpha 6 (KPNA6) was targeted by cfa-miR-197 and cfa-miR-215. Moreover, the binding sites of both microRNAs were assessed by 3′-UTR reporter assay. The results showed that only cfa-miR-197 could bind to the target sites of KPNA6, leading to suppressing luciferase activity. Additionally, silencing of KPNA6 was confirmed by overexpression of cfa-miR-197. This study provides canine microRNA responses to seasonal influenza B viruses, suggesting that virus-mediated microRNAs might play crucial roles in host gene regulation.
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23
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Dumm RE, Heaton NS. The Development and Use of Reporter Influenza B Viruses. Viruses 2019; 11:E736. [PMID: 31404985 PMCID: PMC6723853 DOI: 10.3390/v11080736] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 07/31/2019] [Accepted: 08/02/2019] [Indexed: 12/15/2022] Open
Abstract
Influenza B viruses (IBVs) are major contributors to total human influenza disease, responsible for ~1/3 of all infections. These viruses, however, are relatively less studied than the related influenza A viruses (IAVs). While it has historically been assumed that the viral biology and mechanisms of pathogenesis for all influenza viruses were highly similar, studies have shown that IBVs possess unique characteristics. Relative to IAV, IBV encodes distinct viral proteins, displays a different mutational rate, has unique patterns of tropism, and elicits different immune responses. More work is therefore required to define the mechanisms of IBV pathogenesis. One valuable approach to characterize mechanisms of microbial disease is the use of genetically modified pathogens that harbor exogenous reporter genes. Over the last few years, IBV reporter viruses have been developed and used to provide new insights into the host response to infection, viral spread, and the testing of antiviral therapeutics. In this review, we will highlight the history and study of IBVs with particular emphasis on the use of genetically modified viruses and discuss some remaining gaps in knowledge that can be addressed using reporter expressing IBVs.
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Affiliation(s)
- Rebekah E Dumm
- Department of Molecular Genetics and Microbiology, University School of Medicine Durham, Durham, NC 27710, USA
| | - Nicholas S Heaton
- Department of Molecular Genetics and Microbiology (MGM), Duke University Medical Center, 213 Research Drive, 426 CARL Building, Box 3054, Durham, NC 27710, USA.
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24
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Yuan B, Yang C, Xia X, Zanin M, Wong SS, Yang F, Chang J, Mai Z, Zhao J, Zhang Y, Li R, Zhong N, Yang Z. The tree shrew is a promising model for the study of influenza B virus infection. Virol J 2019; 16:77. [PMID: 31174549 PMCID: PMC6555921 DOI: 10.1186/s12985-019-1171-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2018] [Accepted: 04/30/2019] [Indexed: 11/23/2022] Open
Abstract
Background Influenza B virus is a main causative pathogen of annual influenza epidemics, however, research on influenza B virus in general lags behind that on influenza A viruses, one of the important reasons is studies on influenza B viruses in animal models are limited. Here we investigated the tree shrew as a potential model for influenza B virus studies. Methods Tree shrews and ferrets were inoculated with either a Yamagata or Victoria lineage influenza B virus. Symptoms including nasal discharge and weight loss were observed. Nasal wash and respiratory tissues were collected at 2, 4 and 6 days post inoculation (DPI). Viral titers were measured in nasal washes and tissues were used for pathological examination and extraction of mRNA for measurement of cytokine expression. Results Clinical signs and pathological changes were also evident in the respiratory tracts of tree shrews and ferrets. Although nasal symptoms including sneezing and rhinorrhea were evident in ferrets infected with influenza B virus, tree shrews showed no significant respiratory symptoms, only milder nasal secretions appeared. Weight loss was observed in tree shrews but not ferrets. V0215 and Y12 replicated in all three animal (ferrets, tree shrews and mice) models with peak titers evident on 2DPI. There were no significant differences in peak viral titers in ferrets and tree shrews inoculated with Y12 at 2 and 4DPI, but viral titers were detected at 6DPI in tree shrews. Tree shrews infected with influenza B virus showed similar seroconversion and respiratory tract pathology to ferrets. Elevated levels of cytokines were detected in the tissues isolated from the respiratory tract after infection with either V0215 or Y12 compared to the levels in the uninfected control in both animals. Overall, the tree shrew was sensitive to infection and disease by influenza B virus. Conclusion The tree shrew to be a promising model for influenza B virus research. Electronic supplementary material The online version of this article (10.1186/s12985-019-1171-3) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Bing Yuan
- Department of Respiration, the First People's Hospital of Yunnan Province, Kunming, Yunnan, 650032, People's Republic of China.,The Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, 650032, People's Republic of China
| | - Chunguang Yang
- State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, 510120, People's Republic of China
| | - Xueshan Xia
- Faculty of Life Science and Technology, Kunming University of Science And Technology, Kunming, Yunnan, 650500, People's Republic of China
| | - Mark Zanin
- State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, 510120, People's Republic of China
| | - Sook-San Wong
- State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, 510120, People's Republic of China
| | - Fan Yang
- Medical Faculty, Kunming University of Science And Technology, Kunming, Yunnan, 650500, People's Republic of China
| | - Jixiang Chang
- Medical Faculty, Kunming University of Science And Technology, Kunming, Yunnan, 650500, People's Republic of China
| | - Zhitong Mai
- State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, 510120, People's Republic of China
| | - Jin Zhao
- State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, 510120, People's Republic of China
| | - Yunhui Zhang
- Department of Respiration, the First People's Hospital of Yunnan Province, Kunming, Yunnan, 650032, People's Republic of China.,The Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, 650032, People's Republic of China
| | - Runfeng Li
- State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, 510120, People's Republic of China
| | - Nanshan Zhong
- State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, 510120, People's Republic of China
| | - Zifeng Yang
- State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Disease, Guangzhou Institute of Respiratory Health, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, 510120, People's Republic of China. .,State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and Technology, Avenida Wai Long, Taipa, Macau, People's Republic of China.
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25
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Blanco-Lobo P, Nogales A, Rodríguez L, Martínez-Sobrido L. Novel Approaches for The Development of Live Attenuated Influenza Vaccines. Viruses 2019; 11:E190. [PMID: 30813325 PMCID: PMC6409754 DOI: 10.3390/v11020190] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Revised: 02/19/2019] [Accepted: 02/19/2019] [Indexed: 01/04/2023] Open
Abstract
Influenza virus still represents a considerable threat to global public health, despite the advances in the development and wide use of influenza vaccines. Vaccination with traditional inactivate influenza vaccines (IIV) or live-attenuated influenza vaccines (LAIV) remains the main strategy in the control of annual seasonal epidemics, but it does not offer protection against new influenza viruses with pandemic potential, those that have shifted. Moreover, the continual antigenic drift of seasonal circulating influenza viruses, causing an antigenic mismatch that requires yearly reformulation of seasonal influenza vaccines, seriously compromises vaccine efficacy. Therefore, the quick optimization of vaccine production for seasonal influenza and the development of new vaccine approaches for pandemic viruses is still a challenge for the prevention of influenza infections. Moreover, recent reports have questioned the effectiveness of the current LAIV because of limited protection, mainly against the influenza A virus (IAV) component of the vaccine. Although the reasons for the poor protection efficacy of the LAIV have not yet been elucidated, researchers are encouraged to develop new vaccination approaches that overcome the limitations that are associated with the current LAIV. The discovery and implementation of plasmid-based reverse genetics has been a key advance in the rapid generation of recombinant attenuated influenza viruses that can be used for the development of new and most effective LAIV. In this review, we provide an update regarding the progress that has been made during the last five years in the development of new LAIV and the innovative ways that are being explored as alternatives to the currently licensed LAIV. The safety, immunogenicity, and protection efficacy profile of these new LAIVs reveal their possible implementation in combating influenza infections. However, efforts by vaccine companies and government agencies will be needed for controlled testing and approving, respectively, these new vaccine methodologies for the control of influenza infections.
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Affiliation(s)
- Pilar Blanco-Lobo
- Department of Microbiology and Immunology, School of Medicine and Dentistry, University of Rochester, Rochester, New York, NY 14642, USA.
| | - Aitor Nogales
- Department of Microbiology and Immunology, School of Medicine and Dentistry, University of Rochester, Rochester, New York, NY 14642, USA.
| | - Laura Rodríguez
- Department of Microbiology and Immunology, School of Medicine and Dentistry, University of Rochester, Rochester, New York, NY 14642, USA.
| | - Luis Martínez-Sobrido
- Department of Microbiology and Immunology, School of Medicine and Dentistry, University of Rochester, Rochester, New York, NY 14642, USA.
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26
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Non-lytic clearance of influenza B virus from infected cells preserves epithelial barrier function. Nat Commun 2019; 10:779. [PMID: 30770807 PMCID: PMC6377627 DOI: 10.1038/s41467-019-08617-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 01/22/2019] [Indexed: 01/11/2023] Open
Abstract
Influenza B virus (IBV) is an acute, respiratory RNA virus that has been assumed to induce the eventual death of all infected cells. We and others have shown however, that infection with apparently cytopathic viruses does not necessarily lead to cell death; some cells can intrinsically clear the virus and persist in the host long-term. To determine if any cells can survive direct IBV infection, we here generate a recombinant IBV capable of activating a host-cell reporter to permanently label all infected cells. Using this system, we demonstrate that IBV infection leads to the formation of a survivor cell population in the proximal airways that are ciliated-like, but transcriptionally and phenotypically distinct from both actively infected and bystander ciliated cells. We also show that survivor cells are critical to maintain respiratory barrier function. These results highlight a host response pathway that preserves the epithelium to limit the severity of IBV disease. Infection of a cell with influenza B virus (IBV) often results in cell death and the role of surviving cells in pathogenesis is unclear. Here, Dumm et al. generate a recombinant IBV that activates a host-cell reporter to permanently label infected cells, and show that surviving cells are important to preserve epithelial barrier function.
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27
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Kim MH, Kang JO, Kim JY, Jung HE, Lee HK, Chang J. Single mucosal vaccination targeting nucleoprotein provides broad protection against two lineages of influenza B virus. Antiviral Res 2019; 163:19-28. [PMID: 30639307 DOI: 10.1016/j.antiviral.2019.01.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 12/04/2018] [Accepted: 01/07/2019] [Indexed: 12/27/2022]
Abstract
Nucleoprotein is highly conserved among each type of influenza viruses (A and B) and has received significant attention as a good target for universal influenza vaccine. In this study, we determined whether a recombinant adenovirus encoding nucleoprotein of type B influenza virus (rAd/B-NP) confers protection against influenza virus infection in mice. We also identified a cytotoxic T lymphocyte epitope in the nucleoprotein to determine B-NP-specific CD8 T-cell responses. We found that B-NP-specific CD8 T cells induced by rAd/B-NP immunization played a major role in protection following influenza B virus infection using CD8 knockout mice. To assess the effects of the administration routes on protective immunity, we immunized mice with rAd/B-NP via intranasal or intramuscular routes. Both groups showed strong NP-specific humoral and CD8 T-cell responses, but only intranasal immunization provided complete protection against both lineages of influenza B virus challenge. Intranasal but not intramuscular administration established resident memory CD8 T cells in the airway and lung parenchyma, which were required for efficient protection. Furthermore, rAd/B-NP in combination with rAd/A-NP protected mice against lethal infection with both influenza A and B viruses. These findings demonstrate that rAd/B-NP could be further developed as a universal vaccine against influenza.
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Affiliation(s)
- Myung Hee Kim
- Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul, Republic of Korea
| | - Jung-Ok Kang
- Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul, Republic of Korea
| | - Joo-Young Kim
- Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul, Republic of Korea
| | - Hi Eun Jung
- Biomedical Science and Engineering Interdisciplinary Program, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
| | - Heung Kyu Lee
- Biomedical Science and Engineering Interdisciplinary Program, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
| | - Jun Chang
- Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul, Republic of Korea.
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28
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Patel U, Gingerich A, Widman L, Sarr D, Tripp RA, Rada B. Susceptibility of influenza viruses to hypothiocyanite and hypoiodite produced by lactoperoxidase in a cell-free system. PLoS One 2018; 13:e0199167. [PMID: 30044776 PMCID: PMC6059396 DOI: 10.1371/journal.pone.0199167] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 06/01/2018] [Indexed: 12/03/2022] Open
Abstract
Lactoperoxidase (LPO) is an enzyme found in several exocrine secretions including the airway surface liquid producing antimicrobial substances from mainly halide and pseudohalide substrates. Although the innate immune function of LPO has been documented against several microbes, a detailed characterization of its mechanism of action against influenza viruses is still missing. Our aim was to study the antiviral effect and substrate specificity of LPO to inactivate influenza viruses using a cell-free experimental system. Inactivation of different influenza virus strains was measured in vitro system containing LPO, its substrates, thiocyanate (SCN-) or iodide (I-), and the hydrogen peroxide (H2O2)-producing system, glucose and glucose oxidase (GO). Physiologically relevant concentrations of the components of the LPO/H2O2/(SCN-/I-) antimicrobial system were exposed to twelve different strains of influenza A and B viruses in vitro and viral inactivation was assessed by determining plaque-forming units of non-inactivated viruses using Madin-Darby canine kidney cells (MDCK) cells. Our data show that LPO is capable of inactivating all influenza virus strains tested: H1N1, H1N2 and H3N2 influenza A viruses (IAV) and influenza B viruses (IBV) of both, Yamagata and Victoria lineages. The extent of viral inactivation, however, varied among the strains and was in part dependent on the LPO substrate. Inactivation of H1N1 and H1N2 viruses by LPO showed no substrate preference, whereas H3N2 influenza strains were inactivated significantly more efficiently when iodide, not thiocyanate, was the LPO substrate. Although LPO-mediated inactivation of the influenza B strains tested was strain-dependent, it showed slight preference towards thiocyanate as the substrate. The results presented here show that the LPO/H2O2/(SCN-/I-) cell-free, in vitro experimental system is a functional tool to study the specificity, efficiency and the molecular mechanism of action of influenza inactivation by LPO. These studies tested the hypothesis that influenza strains are all susceptible to the LPO-based antiviral system but exhibit differences in their substrate specificities. We propose that a LPO-based antiviral system is an important contributor to anti-influenza virus defense of the airways.
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Affiliation(s)
- Urmi Patel
- University of Georgia, College of Veterinary Medicine, Department of Infectious Diseases, Athens, Georgia, United States of America
| | - Aaron Gingerich
- University of Georgia, College of Veterinary Medicine, Department of Infectious Diseases, Athens, Georgia, United States of America
| | - Lauren Widman
- University of Georgia, College of Veterinary Medicine, Department of Infectious Diseases, Athens, Georgia, United States of America
| | - Demba Sarr
- University of Georgia, College of Veterinary Medicine, Department of Infectious Diseases, Athens, Georgia, United States of America
| | - Ralph A. Tripp
- University of Georgia, College of Veterinary Medicine, Department of Infectious Diseases, Athens, Georgia, United States of America
| | - Balázs Rada
- University of Georgia, College of Veterinary Medicine, Department of Infectious Diseases, Athens, Georgia, United States of America
- * E-mail:
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29
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Lapinscki B, Pereira LA, Nogueira MB, Vidal LR, Riediger I, Debur MC, Presibella M, Raboni SM. Molecular epidemiology of influenza B virus and implications in immunization strategy, Southern Brazil. Vaccine 2017; 36:107-113. [PMID: 29174679 DOI: 10.1016/j.vaccine.2017.11.033] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Revised: 10/11/2017] [Accepted: 11/13/2017] [Indexed: 02/03/2023]
Abstract
Epidemiological indicators have shown the substantial impact of influenza B (Flu B) on the development of severe acute respiratory infection (SARI) and on mortality rates. In Brazil, the trivalent vaccine, composed of only one Flu B lineage is available. We investigated Flu B infections in clinical samples collected by the epidemiological surveillance service of Paraná State, Brazil, from 2013 to 2016. The Flu B lineages Yamagata- (B/Yam) and Victoria-like (B/Vic) were identified using the qRT-PCR assay, and notification forms were reviewed. Among 379 Flu B positive samples evaluated, 370 (98%) were characterized as B/Yam or B/Vic lineages. Both co-circulated with a frequency of 47% and 53%, respectively. B/Yam infected equally both genders, while B/Vic was more frequent in females (71%). The median age of patients infected by B/Vic (23y; 11-35) was lower than that of patients infected by B/Yam (32y; 12-50). Mismatch between the vaccine and the circulating strain was observed in the 2013 season, with a high number of SARI cases. B/Vic lineage was associated with a larger number of SARI cases (62%), while B/Yam with influenza-like illness (ILI) (61%). Differences were observed in the strains circulating in separate regions of Paraná State. B/Vic was prevalent in the northwestern (67%) and B/Yam in the southeastern region (60%). The unpredictability of Flu B lineage circulation causes a substantial increase in severe disease during epidemics in a vaccine mismatch season. In addition, the differences in the epidemiological profile of the target population of Flu B infections in relation to other respiratory viruses, as well as among the B/Vic and B/Yam lineages may also be associated to an increase in disease burden. These findings have direct consequences on vaccination strategies. Therefore, further molecular epidemiology studies of Flu B in Brazil are required to corroborate these primary results.
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Affiliation(s)
| | | | | | - Luine R Vidal
- Virology Laboratory, Universidade Federal do Paraná, Brazil
| | | | | | | | - Sonia M Raboni
- Infectious Diseases Division, Hospital de Clínicas, Universidade Federal do Paraná (HC-UFPR), Brazil; Virology Laboratory, Universidade Federal do Paraná, Brazil.
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30
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Chen P, Zhang KH, Na T, Wang L, Yin WD, Yuan BZ, Wang JZ. The hUC-MSCs cell line CCRC-1 represents a novel, safe and high-yielding HDCs for the production of human viral vaccines. Sci Rep 2017; 7:12484. [PMID: 28970485 PMCID: PMC5624879 DOI: 10.1038/s41598-017-11997-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 08/31/2017] [Indexed: 12/20/2022] Open
Abstract
MRC-5 represents the most frequent human diploid cells (HDCs)-type cell substrate in the production of human viral vaccines. However, early-passage MRC-5 is diminishing and, due to both technical and ethical issues, it is extremely difficult to derive novel HDCs from fetal lung tissues, which are the common sources of HDCs. Our previous studies suggested that human umbilical cord may represent an alternative but convenient source of new HDCs. Here, we established a three-tiered cell banking system of a hUC-MSC line, designated previously as Cell Collection and Research Center-1 (CCRC-1). The full characterization indicated that the banked CCRC-1 cells were free from adventitious agents and remained non-tumorigenic. The CCRC-1 cells sustained its rapid proliferation even at passage 30 and were susceptible to the infection of a wide spectrum of viruses. Interestingly, the CCRC-1 cells showed much higher production of EV71 or Rubella viruses than MRC-5 and Vero cells when growing in serum-free medium. More importantly, the EV71 vaccine produced from CCRC-1 cells induced immunogenicity while eliciting no detectable toxicities in the tested mice. Collectively, these studies further supported that CCRC-1, and likely other hUC-MSCs as well, may serve as novel, safe and high-yielding HDCs for the production of human viral vaccines.
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Affiliation(s)
- Ping Chen
- Cell Collection and Research Center, National Institutes for Food and Drug Control, Beijing, 100050, PR China.,Department of Oncology, the Affiliated Hospital of Southwest Medical University, Luzhou, P.R. China
| | - Ke-Hua Zhang
- Cell Collection and Research Center, National Institutes for Food and Drug Control, Beijing, 100050, PR China
| | - Tao Na
- Cell Collection and Research Center, National Institutes for Food and Drug Control, Beijing, 100050, PR China
| | - Lin Wang
- Sino Vac Biotech, Beijing, 100085, PR China
| | | | - Bao-Zhu Yuan
- Cell Collection and Research Center, National Institutes for Food and Drug Control, Beijing, 100050, PR China.
| | - Jun-Zhi Wang
- Cell Collection and Research Center, National Institutes for Food and Drug Control, Beijing, 100050, PR China.
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Patzina C, Botting CH, García-Sastre A, Randall RE, Hale BG. Human interactome of the influenza B virus NS1 protein. J Gen Virol 2017; 98:2267-2273. [PMID: 28869005 PMCID: PMC5656757 DOI: 10.1099/jgv.0.000909] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
NS1 proteins of influenza A and B viruses share limited sequence homology, yet both are potent manipulators of host cell processes, particularly interferon (IFN) induction. Although many cellular partners are reported for A/NS1, only a few (e.g. PKR and ISG15) have been identified for B/NS1. Here, affinity-purification and mass spectrometry were used to expand the known host interactome of B/NS1. We identified 22 human proteins as new putative targets for B/NS1, validating several, including DHX9, ILF3, YBX1 and HNRNPC. Consistent with two RNA-binding domains in B/NS1, many of the identified factors bind RNA and some interact with B/NS1 in an RNA-dependent manner. Functional characterization of several B/NS1 interactors identified SNRNP200 as a potential positive regulator of host IFN responses, while ILF3 exhibited dual roles in both IFN induction and influenza B virus replication. These data provide a resource for future investigations into the mechanisms underpinning host cell modulation by influenza B virus NS1.
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Affiliation(s)
- Corinna Patzina
- Institute of Medical Virology, University of Zurich, Winterthurerstrasse 190, Zurich 8057, Switzerland
| | - Catherine H. Botting
- Biomedical Sciences Research Complex, University of St. Andrews, St. Andrews, Fife, KY16 9ST, UK
| | - Adolfo García-Sastre
- Icahn School of Medicine at Mount Sinai, 1 Gustave L. Levy Place, New York, NY 10029, USA
| | - Richard E. Randall
- Biomedical Sciences Research Complex, University of St. Andrews, St. Andrews, Fife, KY16 9ST, UK
| | - Benjamin G. Hale
- Institute of Medical Virology, University of Zurich, Winterthurerstrasse 190, Zurich 8057, Switzerland
- *Correspondence: Benjamin G. Hale,
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Single nucleoprotein residue determines influenza A virus sensitivity to an intertypic suppression mechanism. Virology 2017; 506:99-109. [PMID: 28371631 DOI: 10.1016/j.virol.2017.03.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 03/26/2017] [Accepted: 03/27/2017] [Indexed: 10/19/2022]
Abstract
Several mechanisms underlying intertypic interference between co-infecting influenza types A and B viruses (IAV and IBV) have been proposed. We have recently described one in which IBV's nucleoprotein (BNP) sequestered IAV's nucleoprotein (ANP) and suppressed IAV polymerase and growth. However, its anti-IAV capacity and limitations have not been fully explored. Here, we showed that BNP's inhibitory effect was more potent toward a wide array of avian IAVs, whereas human IAVs revealed moderate resistance. BNP sensitivity was largely determined by ANP's residue 343 at the NP oligomerization interface. An avian IAV polymerase carrying an NP-V343L mutation switched from being highly BNP-sensitive to moderately BNP-resistant, and vice versa for a human IAV polymerase carrying a reverse mutation. To highlight its capacity, we demonstrated that the polymerases of highly-pathogenic H5N1 and the pandemic 2009 (H1N1) strains are strongly inhibited by BNP. Our work provides insights into lineage-specific sensitivity to BNP-mediated intertypic interference.
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Adeola OA. Treatment of Influenza: Prospects of Post-Transcriptional Gene Silencing Through Synthetic siRNAs. EXPLORATORY RESEARCH AND HYPOTHESIS IN MEDICINE 2017; 2:1-2. [DOI: 10.14218/erhm.2016.00013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Abstract
Annual influenza epidemics are caused not only by influenza A viruses but also by influenza B viruses. Initially established for the generation of recombinant influenza A viruses, plasmid-based reverse genetics techniques have allowed researchers the generation of wild type and mutant viruses from full-length cDNA copies of the influenza viral genome. These reverse genetics approaches have allowed researchers to answer important questions on the biology of influenza viruses by genetically engineering infectious recombinant viruses. This has resulted in a better understanding of the molecular biology of influenza viruses, including both viral and host factors required for genome replication and transcription. With the ability to generate recombinant viruses containing specific mutations in the viral genome, these reverse genetics tools have also allowed the identification of viral and host factors involved in influenza pathogenesis, transmissibility, host-range interactions and restrictions, and virulence. Likewise, reverse genetics techniques have been used for the implementation of inactivated or live-attenuated influenza vaccines and the identification of anti-influenza drugs and their mechanism of antiviral activity. In 2002, these reverse genetics approaches allowed also the recovery of recombinant influenza B viruses entirely from plasmid DNA. In this chapter we describe the cloning of influenza B/Brisbane/60/2008 viral RNAs into the ambisense pDP-2002 plasmid and the experimental procedures for the successful generation of recombinant influenza B viruses.
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Affiliation(s)
- Aitor Nogales
- Department of Microbiology and Immunology, University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Rochester, NY, 14642, USA
| | - Daniel R Perez
- Department of Population Health, Poultry Diagnostic and Research Center, College of Veterinary Medicine, University of Georgia, 953 College Station Road, Athens, GA, 30602, USA
| | - Jefferson Santos
- Department of Population Health, Poultry Diagnostic and Research Center, College of Veterinary Medicine, University of Georgia, 953 College Station Road, Athens, GA, 30602, USA
| | - Courtney Finch
- Division of Viral Products, Office of Vaccines Research and Review, Center for Biologics Evaluation and Research, US Food and Drug Administration, Silver Spring, MD, 20993, USA
| | - Luis Martínez-Sobrido
- Department of Microbiology and Immunology, University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Rochester, NY, 14642, USA.
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Nogales A, Martínez-Sobrido L. Reverse Genetics Approaches for the Development of Influenza Vaccines. Int J Mol Sci 2016; 18:E20. [PMID: 28025504 PMCID: PMC5297655 DOI: 10.3390/ijms18010020] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Revised: 12/15/2016] [Accepted: 12/19/2016] [Indexed: 12/20/2022] Open
Abstract
Influenza viruses cause annual seasonal epidemics and occasional pandemics of human respiratory disease. Influenza virus infections represent a serious public health and economic problem, which are most effectively prevented through vaccination. However, influenza viruses undergo continual antigenic variation, which requires either the annual reformulation of seasonal influenza vaccines or the rapid generation of vaccines against potential pandemic virus strains. The segmented nature of influenza virus allows for the reassortment between two or more viruses within a co-infected cell, and this characteristic has also been harnessed in the laboratory to generate reassortant viruses for their use as either inactivated or live-attenuated influenza vaccines. With the implementation of plasmid-based reverse genetics techniques, it is now possible to engineer recombinant influenza viruses entirely from full-length complementary DNA copies of the viral genome by transfection of susceptible cells. These reverse genetics systems have provided investigators with novel and powerful approaches to answer important questions about the biology of influenza viruses, including the function of viral proteins, their interaction with cellular host factors and the mechanisms of influenza virus transmission and pathogenesis. In addition, reverse genetics techniques have allowed the generation of recombinant influenza viruses, providing a powerful technology to develop both inactivated and live-attenuated influenza vaccines. In this review, we will summarize the current knowledge of state-of-the-art, plasmid-based, influenza reverse genetics approaches and their implementation to provide rapid, convenient, safe and more effective influenza inactivated or live-attenuated vaccines.
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Affiliation(s)
- Aitor Nogales
- Department of Microbiology and Immunology, University of Rochester, Rochester, NY 14642, USA.
| | - Luis Martínez-Sobrido
- Department of Microbiology and Immunology, University of Rochester, Rochester, NY 14642, USA.
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Nogales A, Rodríguez-Sánchez I, Monte K, Lenschow DJ, Perez DR, Martínez-Sobrido L. Replication-competent fluorescent-expressing influenza B virus. Virus Res 2016; 213:69-81. [PMID: 26590325 PMCID: PMC5003614 DOI: 10.1016/j.virusres.2015.11.014] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 11/10/2015] [Indexed: 12/22/2022]
Abstract
Influenza B viruses (IBVs) cause annual outbreaks of respiratory illness in humans and are increasingly recognized as a major cause of influenza-associated morbidity and mortality. Studying influenza viruses requires the use of secondary methodologies to identify virus-infected cells. To this end, replication-competent influenza A viruses (IAVs) expressing easily traceable fluorescent proteins have been recently developed. In contrast, similar approaches for IBV are mostly lacking. In this report, we describe the generation and characterization of replication-competent influenza B/Brisbane/60/2008 viruses expressing fluorescent mCherry or GFP fused to the C-terminal of the viral non-structural 1 (NS1) protein. Fluorescent-expressing IBVs display similar growth kinetics and plaque phenotype to wild-type IBV, while fluorescent protein expression allows for the easy identification of virus-infected cells. Without the need of secondary approaches to monitor viral infection, fluorescent-expressing IBVs represent an ideal approach to study the biology of IBV and an excellent platform for the rapid identification and characterization of antiviral therapeutics or neutralizing antibodies using high-throughput screening approaches. Lastly, fluorescent-expressing IBVs can be combined with the recently described reporter-expressing IAVs for the identification of novel therapeutics to combat these two important human respiratory pathogens.
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Affiliation(s)
- Aitor Nogales
- Department of Microbiology and Immunology, University of Rochester, Rochester, NY 14642, USA
| | - Irene Rodríguez-Sánchez
- Department of Microbiology and Immunology, University of Rochester, Rochester, NY 14642, USA
| | - Kristen Monte
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA; Department of Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Deborah J Lenschow
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA; Department of Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Daniel R Perez
- Department of Population Health, Poultry Diagnostic and Research Center, University of Georgia, Athens, GA 30603, USA
| | - Luis Martínez-Sobrido
- Department of Microbiology and Immunology, University of Rochester, Rochester, NY 14642, USA.
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Elderfield RA, Koutsakos M, Frise R, Bradley K, Ashcroft J, Miah S, Lackenby A, Barclay WS. NB protein does not affect influenza B virus replication in vitro and is not required for replication in or transmission between ferrets. J Gen Virol 2015; 97:593-601. [PMID: 26703440 DOI: 10.1099/jgv.0.000386] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The influenza B virus encodes a unique protein, NB, a membrane protein whose function in the replication cycle is not, as yet, understood. We engineered a recombinant influenza B virus lacking NB expression, with no concomitant difference in expression or activity of viral neuraminidase (NA) protein, an important caveat since NA is encoded on the same segment and initiated from a start codon just 4 nt downstream of NB. Replication of the virus lacking NB was not different to wild-type virus with full-length NB in clonal immortalized or complex primary cell cultures. In the mouse model, virus lacking NB induced slightly lower IFN-α levels in infected lungs, but this did not affect virus titres or weight loss. In ferrets infected with a mixture of viruses that did or did not express NB, there was no fitness advantage for the virus that retained NB. Moreover, virus lacking NB protein was transmitted following respiratory droplet exposure of sentinel animals. These data suggest no role for NB in supporting replication or transmission in vivo in this animal model. The role of NB and the nature of selection to retain it in all natural influenza B viruses remain unclear.
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Affiliation(s)
- Ruth A Elderfield
- Section of Virology, Faculty of Medicine, Wright Fleming Institute, Imperial College London, Norfolk Place, London W2 1PG, UK
| | - Marios Koutsakos
- Section of Virology, Faculty of Medicine, Wright Fleming Institute, Imperial College London, Norfolk Place, London W2 1PG, UK
| | - Rebecca Frise
- Section of Virology, Faculty of Medicine, Wright Fleming Institute, Imperial College London, Norfolk Place, London W2 1PG, UK
| | - Konrad Bradley
- Section of Virology, Faculty of Medicine, Wright Fleming Institute, Imperial College London, Norfolk Place, London W2 1PG, UK
| | - Jonathan Ashcroft
- Section of Virology, Faculty of Medicine, Wright Fleming Institute, Imperial College London, Norfolk Place, London W2 1PG, UK
| | - Shanhjahan Miah
- Public Health England, Centre for Infections, Colindale, London, UK
| | - Angie Lackenby
- Public Health England, Centre for Infections, Colindale, London, UK
| | - Wendy S Barclay
- Section of Virology, Faculty of Medicine, Wright Fleming Institute, Imperial College London, Norfolk Place, London W2 1PG, UK
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Koutsakos M, Nguyen THO, Barclay WS, Kedzierska K. Knowns and unknowns of influenza B viruses. Future Microbiol 2015; 11:119-35. [PMID: 26684590 DOI: 10.2217/fmb.15.120] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Influenza B viruses (IBVs) circulate annually along with influenza A (IAV) strains during seasonal epidemics. IBV can dominate influenza seasons and cause severe disease, particularly in children and adolescents. Research has revealed interesting aspects of IBV and highlighted the importance of these viruses in clinical settings. Yet, many important questions remain unanswered. In this review, the clinical relevance of IBV is emphasized, unique features in epidemiology, host range and virology are highlighted and gaps in knowledge pinpointed. Multiple aspects of IBV epidemiology, evolution, virology and immunology are discussed. Future research into IBV is needed to understand how we can prevent severe disease in high-risk groups, especially children and elderly.
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Affiliation(s)
- Marios Koutsakos
- Department of Microbiology & Immunology, University of Melbourne, at the Peter Doherty Institute for Infection & Immunity, Parkville VIC 3010, Australia
| | - Thi H O Nguyen
- Department of Microbiology & Immunology, University of Melbourne, at the Peter Doherty Institute for Infection & Immunity, Parkville VIC 3010, Australia
| | - Wendy S Barclay
- Section of Virology, Faculty of Medicine, Wright Fleming Institute, Imperial College London, Norfolk Place, London W2 1PG, UK
| | - Katherine Kedzierska
- Department of Microbiology & Immunology, University of Melbourne, at the Peter Doherty Institute for Infection & Immunity, Parkville VIC 3010, Australia
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Kim EH, Park SJ, Kwon HI, Kim SM, Kim YI, Song MS, Choi EJ, Pascua PNQ, Choi YK. Mouse adaptation of influenza B virus increases replication in the upper respiratory tract and results in droplet transmissibility in ferrets. Sci Rep 2015; 5:15940. [PMID: 26526113 PMCID: PMC4630645 DOI: 10.1038/srep15940] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Accepted: 09/30/2015] [Indexed: 11/23/2022] Open
Abstract
To investigate the molecular changes that allow influenza B viruses to adapt to new mammalian hosts, influenza B/Florida/04/2006 was serially passaged in BALB/c mice until highly virulent. The viral factors underlying this transition were then investigated in mice and ferrets. Five viruses, including the wild-type virus (P0), three intermediate viruses (P5, P9, and P12), and a lethal mouse-adapted virus (P17 (MA)), harbored one to five amino acid substitutions in the hemagglutinin, M, NP, and PA segments suggesting that these mutations enhance virulence. The P17 (MA) virus replicated significantly more efficiently than the P0 virus both in vitro and in vivo (P < 0.0001), and was highly virulent (MLD50: 10(5.25)TCID50) while the P0, P5, and P9 viruses did not kill any infected mice (MLD50 > 10(6.0)TCID50). Furthermore, the P17 (MA) virus grew to greater titers in the ferret upper respiratory tract compared with the P0 and intermediate viruses, and only the P17 (MA) virus was transmissible between ferrets via both direct and aerosol contact. To our knowledge, this is the first study to demonstrate ferret-to-ferret transmission of influenza B virus and to delineate factors that may affect its transmission.
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Affiliation(s)
- Eun-Ha Kim
- Microbiology Department, College of Medicine and Medical Research Institute, Chungbuk National University, 12 Gaeshin-Dong Heungduk-Ku, Cheongju 361-763, Republic of Korea
| | - Su-Jin Park
- Microbiology Department, College of Medicine and Medical Research Institute, Chungbuk National University, 12 Gaeshin-Dong Heungduk-Ku, Cheongju 361-763, Republic of Korea
| | - Hyeok-Il Kwon
- Microbiology Department, College of Medicine and Medical Research Institute, Chungbuk National University, 12 Gaeshin-Dong Heungduk-Ku, Cheongju 361-763, Republic of Korea
| | - Se Mi Kim
- Microbiology Department, College of Medicine and Medical Research Institute, Chungbuk National University, 12 Gaeshin-Dong Heungduk-Ku, Cheongju 361-763, Republic of Korea
| | - Young-il Kim
- Microbiology Department, College of Medicine and Medical Research Institute, Chungbuk National University, 12 Gaeshin-Dong Heungduk-Ku, Cheongju 361-763, Republic of Korea
| | - Min-Suk Song
- Microbiology Department, College of Medicine and Medical Research Institute, Chungbuk National University, 12 Gaeshin-Dong Heungduk-Ku, Cheongju 361-763, Republic of Korea
| | - Eun-Ji Choi
- Microbiology Department, College of Medicine and Medical Research Institute, Chungbuk National University, 12 Gaeshin-Dong Heungduk-Ku, Cheongju 361-763, Republic of Korea
| | - Philippe Noriel Q. Pascua
- Microbiology Department, College of Medicine and Medical Research Institute, Chungbuk National University, 12 Gaeshin-Dong Heungduk-Ku, Cheongju 361-763, Republic of Korea
- Department of Infectious Disease, St. Jude Children’s Research Hospital, Memphis, Tennessee 38105-2794
| | - Young-Ki Choi
- Microbiology Department, College of Medicine and Medical Research Institute, Chungbuk National University, 12 Gaeshin-Dong Heungduk-Ku, Cheongju 361-763, Republic of Korea
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Liu M, Lam MKH, Zhang Q, Elderfield R, Barclay WS, Shaw PC. The Functional Study of the N-Terminal Region of Influenza B Virus Nucleoprotein. PLoS One 2015; 10:e0137802. [PMID: 26368391 PMCID: PMC4569402 DOI: 10.1371/journal.pone.0137802] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Accepted: 08/21/2015] [Indexed: 11/18/2022] Open
Abstract
Influenza nucleoprotein (NP) is a major component of the ribonucleoprotein (vRNP) in influenza virus, which functions for the transcription and replication of viral genome. Compared to the nucleoprotein of influenza A (ANP), the N-terminal region of influenza B nucleoprotein (BNP) is much extended. By virus reconstitution, we found that the first 38 residues are essential for viral growth. We further illustrated the function of BNP by mini-genome reconstitution, fluorescence microscopy, electron microscopy, light scattering and gel shift. Results show that the N terminus is involved in the formation of both higher homo-oligomers of BNP and BNP-RNA complex.
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Affiliation(s)
- Ming Liu
- Centre for Protein Science and Crystallography, School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Mandy Ka-Han Lam
- Centre for Protein Science and Crystallography, School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Qinfen Zhang
- State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Ruth Elderfield
- Section of Virology, Faculty of Medicine, Imperial College London, London, United Kingdom
| | - Wendy S. Barclay
- Section of Virology, Faculty of Medicine, Imperial College London, London, United Kingdom
| | - Pang-Chui Shaw
- Centre for Protein Science and Crystallography, School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
- * E-mail:
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41
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van de Sandt CE, Bodewes R, Rimmelzwaan GF, de Vries RD. Influenza B viruses: not to be discounted. Future Microbiol 2015; 10:1447-65. [PMID: 26357957 DOI: 10.2217/fmb.15.65] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
In contrast to influenza A viruses, which have been investigated extensively, influenza B viruses have attracted relatively little attention. However, influenza B viruses are an important cause of morbidity and mortality in the human population and full understanding of their biological and epidemiological properties is imperative to better control this important pathogen. However, some of its characteristics are still elusive and warrant investigation. Here, we review evolution, epidemiology, pathogenesis and immunity and identify gaps in our knowledge of influenza B viruses. The divergence of two antigenically distinct influenza B viruses is highlighted. The co-circulation of viruses of these two lineages necessitated the development of quadrivalent influenza vaccines, which is discussed in addition to possibilities to develop universal vaccination strategies.
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Affiliation(s)
- Carolien E van de Sandt
- Department of Viroscience, Erasmus Medical Center, PO Box 2040, 3000 CA, Rotterdam, The Netherlands
| | - Rogier Bodewes
- Department of Viroscience, Erasmus Medical Center, PO Box 2040, 3000 CA, Rotterdam, The Netherlands
| | - Guus F Rimmelzwaan
- Department of Viroscience, Erasmus Medical Center, PO Box 2040, 3000 CA, Rotterdam, The Netherlands.,ViroClinics Biosciences BV, Rotterdam Science Tower, Marconistraat 16, 3029 AK Rotterdam, The Netherlands
| | - Rory D de Vries
- Department of Viroscience, Erasmus Medical Center, PO Box 2040, 3000 CA, Rotterdam, The Netherlands
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Phanich J, Rungrotmongkol T, Sindhikara D, Phongphanphanee S, Yoshida N, Hirata F, Kungwan N, Hannongbua S. A 3D-RISM/RISM study of the oseltamivir binding efficiency with the wild-type and resistance-associated mutant forms of the viral influenza B neuraminidase. Protein Sci 2015; 25:147-58. [PMID: 26044768 DOI: 10.1002/pro.2718] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2015] [Revised: 05/27/2015] [Accepted: 05/28/2015] [Indexed: 11/09/2022]
Abstract
The binding affinity of oseltamivir to the influenza B neuraminidase and to its variants with three single substitutions, E119G, R152K, and D198N, is investigated by the MM/3D-RISM method. The binding affinity or the binding free energy of ligand to receptor was found to be determined by a subtle balance of two major contributions that largely cancel out each other: the ligand-receptor interactions and the dehydration free energy. The theoretical results of the binding affinity of the drug to the mutants reproduced the observed trend in the resistivity, measured by IC50 ; the high-level resistance of E119G and R152K, and the low-level resistance of D198N. For E119G and R152K, reduction of the direct drug-target interaction, especially at the mutated residue, is the main source of high-level oseltamivir resistance. This phenomenon, however, is not found in the D198N strain, which is located in the framework of the active-site.
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Affiliation(s)
- Jiraphorn Phanich
- Department of Chemistry, Computational Chemistry Unit Cell, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Thanyada Rungrotmongkol
- Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand.,Ph.D. Program in Bioinformatics and Computational Biology, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Daniel Sindhikara
- Schrödinger, Inc, 120 West 45th Street, 17th Floor, New York, New York, 10036
| | - Saree Phongphanphanee
- Department of Materials Science, Faculty of Science, Kasetsart University, Bangkok, 10900, Thailand
| | - Norio Yoshida
- Department of Chemistry, Graduate School of Sciences, Kyushu University, Fukuoka, 812-8581, Japan
| | - Fumio Hirata
- College of Life Sciences, Ritsumeikan University, and Molecular Design Frontier Co. Ltd, Kusatsu, 525-8577, Japan
| | - Nawee Kungwan
- Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand
| | - Supot Hannongbua
- Department of Chemistry, Computational Chemistry Unit Cell, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand
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Shin D, Park KJ, Lee H, Cho EY, Kim MS, Hwang MH, Kim SI, Ahn DH. Comparison of immunogenicity of cell-and egg-passaged viruses for manufacturing MDCK cell culture-based influenza vaccines. Virus Res 2015; 204:40-6. [PMID: 25892718 DOI: 10.1016/j.virusres.2015.04.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Revised: 03/12/2015] [Accepted: 04/04/2015] [Indexed: 10/23/2022]
Abstract
While cell culture-based technology has been recently used for manufacturing influenza vaccines, currently available seed viruses are mostly egg-derived reassortants that are egg-adapted to achieve high virus growth in eggs. For use as viruses for cell culture-based influenza vaccine manufacturing, egg-adapted viral seeds may undergo several passages in manufacturing cell lines. However, the suitability of such cell-passaged viruses for vaccine production remains largely unelucidated. In this study, influenza viruses produced in suspension Madin-Darby canine kidney (MDCK) cell cultures were compared to those produced in embryonated hen's eggs for manufacturing MDCK cell culture-based influenza vaccines through comparability studies of virus productivity and vaccine immunogenicity. The results indicate no change in the amino acid sequence of the main antigens, including hemagglutinin (HA) and neuraminidase (NA), of cell-passaged viruses after three passages in suspension MDCK cells. In lab-scale (3-L) single-use bioreactors, suspension MDCK culture supernatants inoculated with cell-passaged viruses were found to show higher virus productivity, suspension MDCK culture supernatants inoculated with egg-passaged viruses, in respect to the HA titers and HA contents determined by single radial immunodiffusion. Finally, comparable hemagglutination inhibition and influenza-specific IgG titers were determined in the mice immunized with cell culture-based vaccines produced with cell- or egg-passaged viruses. These results indicate that MDCK cell-passaged viruses from egg-adapted viruses, as well as egg-derived seed virus, are suitable for MDCK cell culture-based influenza vaccine production.
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Affiliation(s)
- Duckhyang Shin
- Vaccine, Mogam Biotechnology Research Institute, 107, Ihyeon-ro 30beon-gil, Giheung-gu, Yongin-si, Gyeonggi-do, Korea, 446-770, Republic of Korea; Graduate School of Pharmaceutical Sciences, Ewha Womans University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul 120-750, Republic of Korea
| | - Kuk Jin Park
- Virus Vaccine, Green Cross Research Center, 93, Ihyeon-ro 30beon-gil, Giheung-gu, Yongin-si, Gyeonggi-do, Korea, 446-850, Republic of Korea
| | - Hyeon Lee
- Vaccine, Mogam Biotechnology Research Institute, 107, Ihyeon-ro 30beon-gil, Giheung-gu, Yongin-si, Gyeonggi-do, Korea, 446-770, Republic of Korea
| | - Eun Young Cho
- Virus Vaccine, Green Cross Research Center, 93, Ihyeon-ro 30beon-gil, Giheung-gu, Yongin-si, Gyeonggi-do, Korea, 446-850, Republic of Korea
| | - Mi Suk Kim
- Virus Vaccine, Green Cross Research Center, 93, Ihyeon-ro 30beon-gil, Giheung-gu, Yongin-si, Gyeonggi-do, Korea, 446-850, Republic of Korea
| | - Mi Hui Hwang
- Virus Vaccine, Green Cross Research Center, 93, Ihyeon-ro 30beon-gil, Giheung-gu, Yongin-si, Gyeonggi-do, Korea, 446-850, Republic of Korea
| | - Soo In Kim
- Virus Vaccine, Green Cross Research Center, 93, Ihyeon-ro 30beon-gil, Giheung-gu, Yongin-si, Gyeonggi-do, Korea, 446-850, Republic of Korea
| | - Dong Ho Ahn
- Virus Vaccine, Green Cross Research Center, 93, Ihyeon-ro 30beon-gil, Giheung-gu, Yongin-si, Gyeonggi-do, Korea, 446-850, Republic of Korea.
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44
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Poole DS, Yú S, Caì Y, Dinis JM, Müller MA, Jordan I, Friedrich TC, Kuhn JH, Mehle A. Influenza A virus polymerase is a site for adaptive changes during experimental evolution in bat cells. J Virol 2014; 88:12572-85. [PMID: 25142579 PMCID: PMC4248895 DOI: 10.1128/jvi.01857-14] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Accepted: 08/12/2014] [Indexed: 12/27/2022] Open
Abstract
UNLABELLED The recent identification of highly divergent influenza A viruses in bats revealed a new, geographically dispersed viral reservoir. To investigate the molecular mechanisms of host-restricted viral tropism and the potential for transmission of viruses between humans and bats, we exposed a panel of cell lines from bats of diverse species to a prototypical human-origin influenza A virus. All of the tested bat cell lines were susceptible to influenza A virus infection. Experimental evolution of human and avian-like viruses in bat cells resulted in efficient replication and created highly cytopathic variants. Deep sequencing of adapted human influenza A virus revealed a mutation in the PA polymerase subunit not previously described, M285K. Recombinant virus with the PA M285K mutation completely phenocopied the adapted virus. Adaptation of an avian virus-like virus resulted in the canonical PB2 E627K mutation that is required for efficient replication in other mammals. None of the adaptive mutations occurred in the gene for viral hemagglutinin, a gene that frequently acquires changes to recognize host-specific variations in sialic acid receptors. We showed that human influenza A virus uses canonical sialic acid receptors to infect bat cells, even though bat influenza A viruses do not appear to use these receptors for virus entry. Our results demonstrate that bats are unique hosts that select for both a novel mutation and a well-known adaptive mutation in the viral polymerase to support replication. IMPORTANCE Bats constitute well-known reservoirs for viruses that may be transferred into human populations, sometimes with fatal consequences. Influenza A viruses have recently been identified in bats, dramatically expanding the known host range of this virus. Here we investigated the replication of human influenza A virus in bat cell lines and the barriers that the virus faces in this new host. Human influenza A and B viruses infected cells from geographically and evolutionarily diverse New and Old World bats. Viruses mutated during infections in bat cells, resulting in increased replication and cytopathic effects. These mutations were mapped to the viral polymerase and shown to be solely responsible for adaptation to bat cells. Our data suggest that replication of human influenza A viruses in a nonnative host drives the evolution of new variants and may be an important source of genetic diversity.
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Affiliation(s)
- Daniel S Poole
- Department of Medical Microbiology and Immunology, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Shuǐqìng Yú
- NIH/NIAID Integrated Research Facility at Fort Detrick, Frederick, Maryland, USA
| | - Yíngyún Caì
- NIH/NIAID Integrated Research Facility at Fort Detrick, Frederick, Maryland, USA
| | - Jorge M Dinis
- Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Marcel A Müller
- Institute of Virology, University of Bonn Medical Centre, Bonn, Germany
| | | | - Thomas C Friedrich
- Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, Wisconsin, USA Wisconsin National Primate Research Center, Madison, Wisconsin, USA
| | - Jens H Kuhn
- NIH/NIAID Integrated Research Facility at Fort Detrick, Frederick, Maryland, USA
| | - Andrew Mehle
- Department of Medical Microbiology and Immunology, University of Wisconsin-Madison, Madison, Wisconsin, USA
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45
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The N terminus of the influenza B virus nucleoprotein is essential for virus viability, nuclear localization, and optimal transcription and replication of the viral genome. J Virol 2014; 88:12326-38. [PMID: 25122787 DOI: 10.1128/jvi.01542-14] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
UNLABELLED The nucleoprotein (NP) of influenza viruses is a multifunctional protein with essential roles throughout viral replication. Despite influenza A and B viruses belonging to separate genera of the Orthomyxoviridae family, their NP proteins share a relatively high level of sequence conservation. However, NP of influenza B viruses (BNP) contains an evolutionarily conserved N-terminal 50-amino-acid extension that is absent from NP of influenza A viruses. There is conflicting evidence as to the functions of the BNP N-terminal extension; however, this has never been assessed in the context of viral infection. We have used reverse genetics to assess the significance of this region on the functions of BNP and virus viability. The truncation of more than three amino acids prevented virus recovery, suggesting that the N-terminal extension is essential for virus viability. Mutational analysis indicated that multiple regions of the protein are involved in the nuclear localization of BNP, with the entire N-terminal extension required for this to function efficiently. Viruses containing mutations in the first 10 residues of BNP demonstrated few differences in nuclear localization; however, the viruses exhibited significant reductions in viral mRNA transcription and genome replication, resulting in significantly attenuated phenotypes. Mutations introduced to ablate a previously reported nuclear localization signal also resulted in a significant decrease in mRNA production during early stages of viral replication. Overall, our results demonstrate that the N-terminal extension of BNP is essential to virus viability not only for directing nuclear localization of BNP but also for regulating viral mRNA transcription and genome replication. IMPORTANCE The multifunctional NP of influenza viruses has roles throughout the viral replication cycle; therefore, it is essential for virus viability. Despite high levels of homology between the NP of influenza A and B viruses, the NP of influenza B virus contains an evolutionarily conserved 50-amino-acid N-terminal extension that is absent from the NP of influenza A viruses. In this study, we show that this N-terminal extension is essential for virus viability, and we confirm and expand upon recent findings that this region of BNP is required for nuclear localization of the protein. Furthermore, we demonstrate for the first time that the N terminus of BNP is involved in regulating viral mRNA transcription and replication of the viral genome. As the NP of influenza A virus lacks this N-terminal extension, these viruses may have evolved separate mechanisms to regulate these processes.
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Influenza A and B virus intertypic reassortment through compatible viral packaging signals. J Virol 2014; 88:10778-91. [PMID: 25008914 DOI: 10.1128/jvi.01440-14] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
UNLABELLED Influenza A and B viruses cocirculate in humans and together cause disease and seasonal epidemics. These two types of influenza viruses are evolutionarily divergent, and exchange of genetic segments inside coinfected cells occurs frequently within types but never between influenza A and B viruses. Possible mechanisms inhibiting the intertypic reassortment of genetic segments could be due to incompatible protein functions of segment homologs, a lack of processing of heterotypic segments by influenza virus RNA-dependent RNA polymerase, an inhibitory effect of viral proteins on heterotypic virus function, or an inability to specifically incorporate heterotypic segments into budding virions. Here, we demonstrate that the full-length hemagglutinin (HA) of prototype influenza B viruses can complement the function of multiple influenza A viruses. We show that viral noncoding regions were sufficient to drive gene expression for either type A or B influenza virus with its cognate or heterotypic polymerase. The native influenza B virus HA segment could not be incorporated into influenza A virus virions. However, by adding the influenza A virus packaging signals to full-length influenza B virus glycoproteins, we rescued influenza A viruses that possessed HA, NA, or both HA and NA of influenza B virus. Furthermore, we show that, similar to single-cycle infectious influenza A virus, influenza B virus cannot incorporate heterotypic transgenes due to packaging signal incompatibilities. Altogether, these results demonstrate that the lack of influenza A and B virus reassortants can be attributed at least in part to incompatibilities in the virus-specific packaging signals required for effective segment incorporation into nascent virions. IMPORTANCE Reassortment of influenza A or B viruses provides an evolutionary strategy leading to unique genotypes, which can spawn influenza A viruses with pandemic potential. However, the mechanism preventing intertypic reassortment or gene exchange between influenza A and B viruses is not well understood. Nucleotides comprising the coding termini of each influenza A virus gene segment are required for specific segment incorporation during budding. Whether influenza B virus shares a similar selective packaging strategy or if packaging signals prevent intertypic reassortment remains unknown. Here, we provide evidence suggesting a similar mechanism of influenza B virus genome packaging. Furthermore, by appending influenza A virus packaging signals onto influenza B virus segments, we rescued recombinant influenza A/B viruses that could reassort in vitro with another influenza A virus. These findings suggest that the divergent evolution of packaging signals aids with the speciation of influenza A and B viruses and is in part responsible for the lack of intertypic viral reassortment.
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Abstract
During their nuclear replication stage, influenza viruses hijack the host splicing machinery to process some of their RNA segments, the M and NS segments. In this review, we provide an overview of the current knowledge gathered on this interplay between influenza viruses and the cellular spliceosome, with a particular focus on influenza A viruses (IAV). These viruses have developed accurate regulation mechanisms to reassign the host spliceosome to alter host cellular expression and enable an optimal expression of specific spliced viral products throughout infection. Moreover, IAV segments undergoing splicing display high levels of similarity with human consensus splice sites and their viral transcripts show noteworthy secondary structures. Sequence alignments and consensus analyses, along with recently published studies, suggest both conservation and evolution of viral splice site sequences and structure for improved adaptation to the host. Altogether, these results emphasize the ability of IAV to be well adapted to the host's splicing machinery, and further investigations may contribute to a better understanding of splicing regulation with regard to viral replication, host range, and pathogenesis.
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Universal influenza B virus genomic amplification facilitates sequencing, diagnostics, and reverse genetics. J Clin Microbiol 2014; 52:1330-7. [PMID: 24501036 DOI: 10.1128/jcm.03265-13] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Although human influenza B virus (IBV) is a significant human pathogen, its great genetic diversity has limited our ability to universally amplify the entire genome for subsequent sequencing or vaccine production. The generation of sequence data via next-generation approaches and the rapid cloning of viral genes are critical for basic research, diagnostics, antiviral drugs, and vaccines to combat IBV. To overcome the difficulty of amplifying the diverse and ever-changing IBV genome, we developed and optimized techniques that amplify the complete segmented negative-sense RNA genome from any IBV strain in a single tube/well (IBV genomic amplification [IBV-GA]). Amplicons for >1,000 diverse IBV genomes from different sample types (e.g., clinical specimens) were generated and sequenced using this robust technology. These approaches are sensitive, robust, and sequence independent (i.e., universally amplify past, present, and future IBVs), which facilitates next-generation sequencing and advanced genomic diagnostics. Importantly, special terminal sequences engineered into the optimized IBV-GA2 products also enable ligation-free cloning to rapidly generate reverse-genetics plasmids, which can be used for the rescue of recombinant viruses and/or the creation of vaccine seed stock.
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Crescenzo-Chaigne B, Barbezange C, van der Werf S. The Panhandle formed by influenza A and C virus NS non-coding regions determines NS segment expression. PLoS One 2013; 8:e81550. [PMID: 24348921 PMCID: PMC3858493 DOI: 10.1371/journal.pone.0081550] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Accepted: 10/23/2013] [Indexed: 11/18/2022] Open
Abstract
Exchange of the extremities of the NS segment of type A and C influenza viruses in reverse genetics systems was used to assess their putative role in type specificity. Restoration of each specific proximal panhandle was mandatory to allow the rescue of viruses with heterotypic extremities. Moreover, the transcription level of the modified segment seemed to be directly affected by the distal panhandle strength.
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Affiliation(s)
- Bernadette Crescenzo-Chaigne
- Unité de Génétique Moléculaire des Virus à ARN, Institut Pasteur, Paris, France
- Unité Mixte de Recherche 3569, Centre National de la Recherche Scientifique, Paris, France
- Unité de Génétique Moléculaire des Virus à ARN, Université Paris Diderot Sorbonne Paris Cité, Paris, France
| | - Cyril Barbezange
- Unité de Génétique Moléculaire des Virus à ARN, Institut Pasteur, Paris, France
- Unité Mixte de Recherche 3569, Centre National de la Recherche Scientifique, Paris, France
- Unité de Génétique Moléculaire des Virus à ARN, Université Paris Diderot Sorbonne Paris Cité, Paris, France
| | - Sylvie van der Werf
- Unité de Génétique Moléculaire des Virus à ARN, Institut Pasteur, Paris, France
- Unité Mixte de Recherche 3569, Centre National de la Recherche Scientifique, Paris, France
- Unité de Génétique Moléculaire des Virus à ARN, Université Paris Diderot Sorbonne Paris Cité, Paris, France
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Kim JC, Kim HM, Kang YM, Ku KB, Park EH, Yum J, Kim JA, Kang YK, Lee JS, Kim HS, Seo SH. Severe pathogenesis of influenza B virus in pregnant mice. Virology 2013; 448:74-81. [PMID: 24314638 DOI: 10.1016/j.virol.2013.10.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Revised: 09/09/2013] [Accepted: 10/01/2013] [Indexed: 01/22/2023]
Abstract
The study on pathogenesis of influenza B virus during pregnancy is limited. Here, we showed using a mouse model that influenza B virus could cause severe disease including death during pregnancy. Infected pregnant mice resulted in 40% mortality, but infected age-matched non-pregnant mice did not show any death. Infected pregnant mice contained high viral loads in lungs with the elevated inductions of inflammatory cytokines and chemokines than infected non-pregnant mice. Infected pregnant mice delivered lower number of neonates than uninfected pregnant mice, suggesting adverse effects of influenza B virus on fetuses. Progesterone which is important for maintaining pregnancy was reduced in uteruses of infected pregnant mice than in those of uninfected pregnant mice. Taken together, our results suggest that influenza B virus can cause severe disease during pregnancy, and that preventive measures including vaccination may be important for protecting women during pregnancy.
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Affiliation(s)
- Jeong Cheol Kim
- Laboratory of Influenza Research, College of Veterinary Medicine, Chungnam National University, Daejeon 305-764, Republic of Korea; Institute for Influenza Virus, College of Veterinary Medicine, Chungnam National University, Daejeon 305-764, Republic of Korea
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