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Kistler KE, Bedford T. An atlas of continuous adaptive evolution in endemic human viruses. Cell Host Microbe 2023; 31:1898-1909.e3. [PMID: 37883977 DOI: 10.1016/j.chom.2023.09.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 08/25/2023] [Accepted: 09/28/2023] [Indexed: 10/28/2023]
Abstract
Through antigenic evolution, viruses such as seasonal influenza evade recognition by neutralizing antibodies. This means that a person with antibodies well tuned to an initial infection will not be protected against the same virus years later and that vaccine-mediated protection will decay. To expand our understanding of which endemic human viruses evolve in this fashion, we assess adaptive evolution across the genome of 28 endemic viruses spanning a wide range of viral families and transmission modes. Surface proteins consistently show the highest rates of adaptation, and ten viruses in this panel are estimated to undergo antigenic evolution to selectively fix mutations that enable the escape of prior immunity. Thus, antibody evasion is not an uncommon evolutionary strategy among human viruses, and monitoring this evolution will inform future vaccine efforts. Additionally, by comparing overall amino acid substitution rates, we show that SARS-CoV-2 is accumulating protein-coding changes at substantially faster rates than endemic viruses.
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Affiliation(s)
- Kathryn E Kistler
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Center, Seattle, WA, USA; Howard Hughes Medical Institute, Seattle, WA, USA.
| | - Trevor Bedford
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Center, Seattle, WA, USA; Howard Hughes Medical Institute, Seattle, WA, USA
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2
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Zareh-Khoshchehreh R, Salimi V, Nasab GSF, Naseri M, Fard FAN, Azad TM. Genetic Characterization of the H Gene of MeV Strains (H1, B3, and D4) Recently Circulated in Iran for Improving the Molecular Measles Surveillance in the National Measles Lab. IRANIAN JOURNAL OF PUBLIC HEALTH 2023; 52:1730-1738. [PMID: 37744531 PMCID: PMC10512145 DOI: 10.18502/ijph.v52i8.13412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Accepted: 03/19/2023] [Indexed: 09/26/2023]
Abstract
Background Despite decreasing the global burden of measles disease after the introduction of vaccination, measles remains one of the most devastating childhood diseases. Since genotype B3 is reported as a predominant Measles Virus (MeV) genotype recently, the current study aimed to better understand MeV genetic variation by analyzing the complete sequence of Hemagglutinin (H) gene associated with outbreaks of circulated genotypes in Iran. Methods Nine positive measles specimens were selected from three circulated different genotypes H1, B3, and D4. Two different regions of MeV RNA were detected by RT-PCR assay. Sequence data and phylogenetic trees were analyzed and constructed by MEGA X software program. Moreover, missense and silent mutations in critical positions of the MeV-H protein were investigated. Results The result of phylogenetic analysis from the C-terminus of the Nucleoprotein gene (NP-450) and the complete H gene revealed that the mean sequence diversity was 0.06%-0.08% and 0.04%, respectively. Genotype H1 had the highest mutation in this study; however, the substitutions in genotype B3 fundamentally occurred in critical epitopes. Moreover, genotype D4 was more stable than genotypes B3 and H1. Conclusion Mutations were investigated in the whole sequence of H protein. Moreover, the mutations that occur in the critical sites of the protein have an important effect on the pathogenicity of the virus. In this way, we were able to illustrate why genotype B3 is more transmissible than other measles genotypes and is the most important circulating genotype around the world.
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Affiliation(s)
- Raziyeh Zareh-Khoshchehreh
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
- Department of Virology, School of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Vahid Salimi
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
- National Reference Laboratory for Measles and Rubella, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Ghazal Sadat Fatemi Nasab
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
- National Reference Laboratory for Measles and Rubella, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Maryam Naseri
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Fatemeh Adjami Nezhad Fard
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
- National Reference Laboratory for Measles and Rubella, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Talat Mokhtari Azad
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
- National Reference Laboratory for Measles and Rubella, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
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3
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Bi Z, Wang W, Xia X. Structure and function of a novel lineage-specific neutralizing epitope on H protein of canine distemper virus. Front Microbiol 2023; 13:1088243. [PMID: 36713169 PMCID: PMC9875009 DOI: 10.3389/fmicb.2022.1088243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Accepted: 12/28/2022] [Indexed: 01/13/2023] Open
Abstract
Canine distemper virus (CDV) infects many sensitive species worldwide and its host range is expanding. The hemagglutinin (H) protein, the major neutralizing target, binds to cellular receptors and subsequently triggers fusion for initial viral infection. So it's necessary to clarify the precise neutralizing epitopes of H protein and extend the knowledge of mechanisms of virus neutralization. In this study, a neutralizing monoclonal antibody (mAb) 2D12 against CDV H protein, which had different reactivity with different CDV strains, was generated and characterized. A series of truncated H proteins were screened to define the minimal linear epitope 238DIEREFD244 recognized by 2D12. Further investigation revealed that the epitope was highly conserved in America-1 vaccine lineage of CDV strains, but different substitutions in the epitope appeared in CDV strains of the other lineages and two substitutions (D238Y and R241G) caused the change of antigenicity. Thus, the epitope represents a novel lineage-specific neutralizing target on H protein of CDV for differentiation of America-1 vaccine lineage and the other lineages of CDV strains. The epitope was identified to localize at the surface of H protein in two different positions in a three-dimensional (3D) structure, but not at the position of the receptor-binding site (RBS), so the mAb 2D12 that recognized the epitope did not inhibit binding of H protein to the receptor. But mAb 2D12 interfered with the H-F interaction for inhibiting membrane fusion, suggesting that the mAb plays key roles for formation of H-F protein oligomeric structure. Our data will contribute to the understanding of the structure, function, and antigenicity of CDV H protein and mechanisms of virus neutralization.
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Affiliation(s)
- Zhenwei Bi
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture and Rural Affairs, National Center for Engineering Research of Veterinary Bio-products, Nanjing, China,Jiangsu Key Laboratory of Zoonosis, Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, China,*Correspondence: Zhenwei Bi,
| | - Wenjie Wang
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture and Rural Affairs, National Center for Engineering Research of Veterinary Bio-products, Nanjing, China,Jiangsu Key Laboratory of Zoonosis, Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, China,College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Xingxia Xia
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture and Rural Affairs, National Center for Engineering Research of Veterinary Bio-products, Nanjing, China,Jiangsu Key Laboratory of Zoonosis, Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, China
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4
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Biavasco R, De Giovanni M. The Relative Positioning of B and T Cell Epitopes Drives Immunodominance. Vaccines (Basel) 2022; 10:vaccines10081227. [PMID: 36016115 PMCID: PMC9413633 DOI: 10.3390/vaccines10081227] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 07/27/2022] [Accepted: 07/27/2022] [Indexed: 12/05/2022] Open
Abstract
Humoral immunity is crucial for protection against invading pathogens. Broadly neutralizing antibodies (bnAbs) provide sterilizing immunity by targeting conserved regions of viral variants and represent the goal of most vaccination approaches. While antibodies can be selected to bind virtually any region of a given antigen, the consistent induction of bnAbs in the context of influenza and HIV has represented a major roadblock. Many possible explanations have been considered; however, none of the arguments proposed to date seem to fully recapitulate the observed counter-selection for broadly protective antibodies. Antibodies can influence antigen presentation by enhancing the processing of CD4 epitopes adjacent to the binding region while suppressing the overlapping ones. We analyze the relative positioning of dominant B and T cell epitopes in published antigens that elicit strong and poor humoral responses. In strong immunogenic antigens, regions bound by immunodominant antibodies are frequently adjacent to CD4 epitopes, potentially boosting their presentation. Conversely, poorly immunogenic regions targeted by bnAbs in HIV and influenza overlap with clusters of dominant CD4 epitopes, potentially conferring an intrinsic disadvantage for bnAb-bearing B cells in germinal centers. Here, we propose the theory of immunodominance relativity, according to which the relative positioning of immunodominant B and CD4 epitopes within a given antigen drives immunodominance. Thus, we suggest that the relative positioning of B-T epitopes may be one additional mechanism that cooperates with other previously described processes to influence immunodominance. If demonstrated, this theory can improve the current understanding of immunodominance, provide a novel explanation for HIV and influenza escape from humoral responses, and pave the way for a new rational design of universal vaccines.
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Affiliation(s)
- Riccardo Biavasco
- Department of Genetics and Cell Biology, IRCCS San Raffaele Scientific Institute, 20132 Milan, Italy;
| | - Marco De Giovanni
- Department of Microbiology and Immunology, University of California San Francisco, San Francisco, CA 94143, USA
- Correspondence:
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5
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Short-stalk isoforms of CADM1 and CADM2 trigger neuropathogenic measles virus-mediated membrane fusion by interacting with the viral hemagglutinin. J Virol 2021; 96:e0194921. [PMID: 34788082 DOI: 10.1128/jvi.01949-21] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Measles virus (MeV), an enveloped RNA virus in the family Paramyxoviridae, usually causes acute febrile illness with skin rash, but in rare cases persists in the brain, causing a progressive neurological disorder, subacute sclerosing panencephalitis (SSPE). MeV bears two envelope glycoproteins, the hemagglutinin (H) and fusion (F) proteins. The H protein possesses a head domain that initially mediates receptor binding and a stalk domain that subsequently transmits the fusion-triggering signal to the F protein. We have recently shown that cell adhesion molecule 1 (CADM1, also known as IGSF4A, Necl-2, SynCAM1) and CADM2 (also known as IGSF4D, Necl-3, SynCAM2) are host factors enabling cell-cell membrane fusion mediated by hyperfusogenic F proteins of neuropathogenic MeVs as well as MeV spread between neurons lacking the known receptors. CADM1 and CADM2 interact in cis with the H protein on the same cell membrane, triggering hyperfusogenic F protein-mediated membrane fusion. Multiple isoforms of CADM1 and CADM2 containing various lengths of their stalk regions are generated by alternative splicing. Here we show that only short-stalk isoforms of CADM1 and CADM2 predominantly expressed in the brain induce hyperfusogenic F protein-mediated membrane fusion. While the known receptors interact in trans with the H protein through its head domain, these isoforms can interact in cis even with the H protein lacking the head domain and trigger membrane fusion, presumably through its stalk domain. Thus, our results unveil a new mechanism of viral fusion triggering by host factors. Importance Measles, an acute febrile illness with skin rash, is still an important cause of childhood morbidity and mortality worldwide. Measles virus (MeV), the causative agent of measles, may also cause a progressive neurological disorder, subacute sclerosing panencephalitis (SSPE), several years after acute infection. The disease is fatal, and no effective therapy is available. Recently, we have reported that cell adhesion molecule 1 (CADM1) and CADM2 are host factors enabling MeV cell-to-cell spread in neurons. These molecules interact in cis with the MeV attachment protein on the same cell membrane, triggering the fusion protein and causing membrane fusion. CADM1 and CADM2 are known to exist in multiple splice isoforms. In this study, we report that their short-stalk isoforms can induce membrane fusion by interacting in cis with the viral attachment protein independently of its receptor-binding head domain. This finding may have important implications for cis-acting fusion triggering by host factors.
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6
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Ali MG, Zhang Z, Gao Q, Pan M, Rowan EG, Zhang J. Recent advances in therapeutic applications of neutralizing antibodies for virus infections: an overview. Immunol Res 2020; 68:325-339. [PMID: 33161557 PMCID: PMC7648849 DOI: 10.1007/s12026-020-09159-z] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 10/21/2020] [Indexed: 12/14/2022]
Abstract
Antibodies are considered as an excellent foundation to neutralize pathogens and as highly specific therapeutic agents. Antibodies are generated in response to a vaccine but little use as immunotherapy to combat virus infections. A new generation of broadly cross-reactive and highly potent antibodies has led to a unique chance for them to be used as a medical intervention. Neutralizing antibodies (monoclonal and polyclonal antibodies) are desirable for pharmaceutical products because of their ability to target specific epitopes with their variable domains by precise neutralization mechanisms. The isolation of neutralizing antiviral antibodies has been achieved by Phage displayed antibody libraries, transgenic mice, B cell approaches, and hybridoma technology. Antibody engineering technologies have led to efficacy improvements, to further boost antibody in vivo activities. “Although neutralizing antiviral antibodies have some limitations that hinder their full development as therapeutic agents, the potential for prevention and treatment of infections, including a range of viruses (HIV, Ebola, MERS-COV, CHIKV, SARS-CoV, and SARS-CoV2), are being actively pursued in human clinical trials.”
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Affiliation(s)
- Manasik Gumah Ali
- Antibody Engineering Laboratory, School of Life Science & Technology, China Pharmaceutical University, Nanjing, China
| | - Zhening Zhang
- Antibody Engineering Laboratory, School of Life Science & Technology, China Pharmaceutical University, Nanjing, China
| | - Qi Gao
- Antibody Engineering Laboratory, School of Life Science & Technology, China Pharmaceutical University, Nanjing, China
| | - Mingzhu Pan
- Antibody Engineering Laboratory, School of Life Science & Technology, China Pharmaceutical University, Nanjing, China
| | - Edward G Rowan
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University Strathclyde, Glasgow, UK
| | - Juan Zhang
- Antibody Engineering Laboratory, School of Life Science & Technology, China Pharmaceutical University, Nanjing, China.
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7
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Plemper RK. Measles Resurgence and Drug Development. Curr Opin Virol 2020; 41:8-17. [PMID: 32247280 DOI: 10.1016/j.coviro.2020.02.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 02/19/2020] [Accepted: 02/24/2020] [Indexed: 12/16/2022]
Abstract
Measles caused an estimated minimum of one million fatalities annually before vaccination. Outstanding progress towards controlling the virus has been made since the measles vaccine was introduced, but reduction of measles case-fatalities has stalled at around 100,000 annually for the last decade and a 2019 resurgence in several geographical regions threatens some of these past accomplishments. Whereas measles eradication through vaccination is feasible, a potentially open-ended endgame of elimination may loom. Other than doubling-down on existing approaches, is it worthwhile to augment vaccination efforts with antiviral therapeutics to solve the conundrum? This question is hypothetical at present, since no drugs have yet been approved specifically for the treatment of measles, or infection by any other pathogen of the paramyxovirus family. This article will consider obstacles that have hampered anti-measles and anti-paramyxovirus drug development, discuss MeV-specific challenges of clinical testing, and define drug properties suitable to address some of these problems.
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Affiliation(s)
- Richard K Plemper
- Institute for Biomedical Sciences, Georgia State University, Atlanta, GA 30303, USA.
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8
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Phylogenetic evidence of the intercontinental circulation of a Canine distemper virus lineage in the Americas. Sci Rep 2019; 9:15747. [PMID: 31673120 PMCID: PMC6823503 DOI: 10.1038/s41598-019-52345-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Accepted: 10/16/2019] [Indexed: 11/28/2022] Open
Abstract
Canine distemper virus (CDV) is the cause of a multisystem disease in domestic dogs and wild animals, infecting more than 20 carnivore and non-carnivore families and even infecting human cell lines in in vitro conditions. Phylogenetic classification based on the hemagglutinin gene shows 17 lineages with a phylogeographic distribution pattern. In Medellín (Colombia), the lineage South America-3 is considered endemic. Phylogenetic studies conducted in Ecuador using fragment coding for the fusion protein signal peptide (Fsp) characterized a new strain belonging to a different lineage. For understanding the distribution of the South America-3 lineage in the north of the South American continent, we characterized CDV from three Colombian cities (Medellín, Bucaramanga, and Bogotá). Using phylogenetic analysis of the hemagglutinin gene and the Fsp region, we confirmed the circulation of CDV South America-3 in different areas of Colombia. We also described, for the first time to our knowledge, the circulation of a new lineage in Medellín that presents a group monophyletic with strains previously characterized in dogs in Ecuador and in wildlife and domestic dogs in the United States, for which we propose the name “South America/North America-4” due its intercontinental distribution. In conclusion, our results indicated that there are at least four different CDV lineages circulating in domestic dogs in South America: the Europe/South America-1 lineage circulating in Brazil, Uruguay, and Argentina; the South America-2 lineage restricted to Argentina; the South America-3 lineage, which has only been reported in Colombia; and lastly an intercontinental lineage present in Colombia, Ecuador, and the United States, referred to here as the “South America/North America-4” lineage.
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9
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Tadokoro T, Jahan ML, Ito Y, Tahara M, Chen S, Imai A, Sugimura N, Yoshida K, Saito M, Ose T, Hashiguchi T, Takeda M, Fukuhara H, Maenaka K. Biophysical characterization and single-chain Fv construction of a neutralizing antibody to measles virus. FEBS J 2019; 287:145-159. [PMID: 31287622 DOI: 10.1111/febs.14991] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2018] [Revised: 05/01/2019] [Accepted: 07/06/2019] [Indexed: 12/22/2022]
Abstract
The measles virus (MV) is a major cause of childhood morbidity and mortality worldwide. We previously established a mouse monoclonal antibody, 2F4, which shows high neutralizing titers against eight different genotypes of MV. However, the molecular basis for the neutralizing activity of the 2F4 antibody remains incompletely understood. Here, we have evaluated the binding characteristics of a Fab fragment of the 2F4 antibody. Using the MV infectious assay, we demonstrated that 2F4 Fab inhibits viral entry via either of two cellular receptors, SLAM and Nectin4. Surface plasmon resonance (SPR) analysis of recombinant proteins indicated that 2F4 Fab interacts with MV hemagglutinin (MV-H) with a KD value at the nm level. Furthermore, we designed a single-chain Fv fragment of 2F4 antibody as another potential biopharmaceutical to target measles. The stable 2F4 scFv was successfully prepared by the refolding method and shown to interact with MV-H at the μm level. Like 2F4 Fab, scFv inhibited receptor binding and viral entry. This indicates that 2F4 mAb uses the receptor-binding site and/or a neighboring region as an epitope with high affinity. These results provide insight into the neutralizing activity and potential therapeutic use of antibody fragments for MV infection.
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Affiliation(s)
- Takashi Tadokoro
- Faculty of Pharmaceutical Science, Hokkaido University, Sapporo, Japan
| | - Mst Lubna Jahan
- Faculty of Pharmaceutical Science, Hokkaido University, Sapporo, Japan
| | - Yuri Ito
- Faculty of Pharmaceutical Science, Hokkaido University, Sapporo, Japan
| | - Maino Tahara
- Department of Virology 3, National Institute of Infectious Diseases, Tokyo, Japan
| | - Surui Chen
- Faculty of Pharmaceutical Science, Hokkaido University, Sapporo, Japan
| | - Atsutoshi Imai
- Faculty of Pharmaceutical Science, Hokkaido University, Sapporo, Japan
| | - Natsumi Sugimura
- Faculty of Pharmaceutical Science, Hokkaido University, Sapporo, Japan
| | - Koki Yoshida
- Faculty of Pharmaceutical Science, Hokkaido University, Sapporo, Japan
| | - Mizuki Saito
- Faculty of Pharmaceutical Science, Hokkaido University, Sapporo, Japan
| | - Toyoyuki Ose
- Faculty of Pharmaceutical Science, Hokkaido University, Sapporo, Japan
| | - Takao Hashiguchi
- Department of Virology, Faculty of Medicine, Kyushu University, Fukuoka, Japan
| | - Makoto Takeda
- Department of Virology 3, National Institute of Infectious Diseases, Tokyo, Japan
| | - Hideo Fukuhara
- Faculty of Pharmaceutical Science, Hokkaido University, Sapporo, Japan
| | - Katsumi Maenaka
- Faculty of Pharmaceutical Science, Hokkaido University, Sapporo, Japan
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10
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Ciceri G, Canuti M, Bianchi S, Gori M, Piralla A, Colzani D, Libretti M, Frati ER, Baggieri M, Lai A, Rovida F, Zehender G, Baldanti F, Magurano F, Tanzi E, Amendola A. Genetic variability of the measles virus hemagglutinin gene in B3 genotype strains circulating in Northern Italy. INFECTION GENETICS AND EVOLUTION 2019; 75:103943. [PMID: 31255832 DOI: 10.1016/j.meegid.2019.103943] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Revised: 06/24/2019] [Accepted: 06/26/2019] [Indexed: 11/18/2022]
Abstract
Sequencing the whole measles virus hemagglutinin (H) gene, in conjunction with a 450-nucleotide region of the nucleoprotein gene (N-450), is helpful for the identification of new genotypes and as an auxiliary in outbreak characterization. In addition, it is essential to be able to predict the antigenic changes of the H protein to gain a better monitoring of the response to the vaccine. In this study, we obtained the full-length H gene sequences from 19 measles virus (MV) strains belonging to two B3 genotype variants circulating in Lombardy (Northern Italy) between July 2015 and February 2016 and evaluated the variability of the whole MV-H gene. Furthermore, we compared the obtained H amino acid sequences to all MV sequences available in the GenBank database (n = 1152 in total) and analyzed the amino acid substitutions in the H protein within clades where the Italian strains were included. We identified a higher variability in the H gene compared to the N-450 region and our results support previous studies, highlighting that the H gene is more informative for characterizing the MV B3 genotype than the N-450 sequence. Some of the amino acid substitutions were fixed in the viral population and, remarkably, some of the amino acid substitutions were typically present only in the Italian sequences. Accumulating further molecular information about MV-H gene will be necessary to enable in-depth analyses of the variability of this gene in the vaccinated population.
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Affiliation(s)
- G Ciceri
- Department of Biomedical Sciences for Health, University of Milan, via Carlo Pascal, 36, 20133 Milan, Italy.
| | - M Canuti
- Department of Biology, Memorial University of Newfoundland, 232 Elizabeth Ave., St. John's, NL A1B 3X9, Canada
| | - S Bianchi
- Department of Biomedical Sciences for Health, University of Milan, via Carlo Pascal, 36, 20133 Milan, Italy.
| | - M Gori
- Department of Biomedical Sciences for Health, University of Milan, via Carlo Pascal, 36, 20133 Milan, Italy
| | - A Piralla
- Molecular Virology Unit, Microbiology and Virology Department, Fondazione IRCCS Policlinico San Matteo, via Taramelli, 5, 27100 Pavia, Italy.
| | - D Colzani
- Department of Biomedical Sciences for Health, University of Milan, via Carlo Pascal, 36, 20133 Milan, Italy.
| | - M Libretti
- Department of Biomedical Sciences for Health, University of Milan, via Carlo Pascal, 36, 20133 Milan, Italy
| | - E R Frati
- Department of Biomedical Sciences for Health, University of Milan, via Carlo Pascal, 36, 20133 Milan, Italy
| | - M Baggieri
- Department of Infectious Parasitic and Immune-Mediated Diseases, National Reference Laboratory for Measles and Rubella, Istituto Superiore di Sanità, Viale Regina Elena, 299, 00161 Rome, Italy.
| | - A Lai
- Department of Biomedical and Clinical Sciences "Luigi Sacco", Section of Infectious Diseases, University of Milan, Via Gian Battista Grassi, 74, 20157 Milan, Italy.
| | - F Rovida
- Molecular Virology Unit, Microbiology and Virology Department, Fondazione IRCCS Policlinico San Matteo, via Taramelli, 5, 27100 Pavia, Italy.
| | - G Zehender
- Department of Biomedical and Clinical Sciences "Luigi Sacco", Section of Infectious Diseases, University of Milan, Via Gian Battista Grassi, 74, 20157 Milan, Italy; Coordinated Research Center "EpiSoMI", University of Milan, via Carlo Pascal, 36, 20133 Milan, Italy.
| | - F Baldanti
- Molecular Virology Unit, Microbiology and Virology Department, Fondazione IRCCS Policlinico San Matteo, via Taramelli, 5, 27100 Pavia, Italy.
| | - F Magurano
- Department of Infectious Parasitic and Immune-Mediated Diseases, National Reference Laboratory for Measles and Rubella, Istituto Superiore di Sanità, Viale Regina Elena, 299, 00161 Rome, Italy.
| | - E Tanzi
- Department of Biomedical Sciences for Health, University of Milan, via Carlo Pascal, 36, 20133 Milan, Italy; Coordinated Research Center "EpiSoMI", University of Milan, via Carlo Pascal, 36, 20133 Milan, Italy.
| | - A Amendola
- Department of Biomedical Sciences for Health, University of Milan, via Carlo Pascal, 36, 20133 Milan, Italy; Coordinated Research Center "EpiSoMI", University of Milan, via Carlo Pascal, 36, 20133 Milan, Italy.
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11
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Hong J, Kim D, Won Y, Yoon J, Park KJ, Oh J, Kim CW. Correlation between the results of two analytical methods for measuring measles virus neutralizing antibodies in source plasma and therapeutic immunoglobulin products. Biologicals 2019; 59:20-28. [PMID: 30992162 DOI: 10.1016/j.biologicals.2019.03.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 03/08/2019] [Accepted: 03/31/2019] [Indexed: 12/18/2022] Open
Abstract
Patients with primary immunodeficiency disorders are vulnerable to infectious diseases. Intravenous immunoglobulin (IVIG) therapeutic products manufactured from human plasma are employed widely to protect patients from pathogens such as measles virus, which causes a potentially fatal and contagious disease. Therefore, health authorities stipulate a minimum titer of measles neutralizing antibodies (mnAbs) in IVIG products to ensure efficient protection. In general, mnAb titers are measured in a cell-based neutralization assay; however, this assay is labor intensive and time consuming, and the results are variable. Here, we compared a cell-based neutralizing assay with several ELISA tests to evaluate whether ELISAs can overcome the limitations of cell-based assays. The mnAb concentrations measured by the ELISAs showed a strong and significant positive correlation with those measured in a cell-based assay. Also, strong positive correlations were identified for measurement of individual source plasmas, which are used as raw materials for manufacturing IVIG products. Measurement by ELISA revealed that about 80% of 198 source plasmas had mnAb concentrations of <500 mIU/mL. These results suggest that quantitative ELISAs based on relevant antigens allow reliable and comprehensive measurement of mnAb concentrations in source plasmas and drug product; these ELISAs are also faster and more accurate than cell-based assay.
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Affiliation(s)
- Jeungwoon Hong
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, 02841, Anam-dong, Seoungbuk-gu, Seoul, Republic of Korea; GC Pharma., Ihyeon-ro 30 Beon-gil 107, Giheung-gu, Yongin-si, Gyeonggi-do, 16924, Republic of Korea.
| | - Daegeun Kim
- GC Pharma., Ihyeon-ro 30 Beon-gil 107, Giheung-gu, Yongin-si, Gyeonggi-do, 16924, Republic of Korea.
| | - Younhee Won
- GC Pharma., Ihyeon-ro 30 Beon-gil 107, Giheung-gu, Yongin-si, Gyeonggi-do, 16924, Republic of Korea.
| | - Jungsoon Yoon
- GC Pharma., Ihyeon-ro 30 Beon-gil 107, Giheung-gu, Yongin-si, Gyeonggi-do, 16924, Republic of Korea.
| | - Kuk Jin Park
- GC Pharma., Ihyeon-ro 30 Beon-gil 107, Giheung-gu, Yongin-si, Gyeonggi-do, 16924, Republic of Korea.
| | - Jaetaek Oh
- GC Pharma., Ihyeon-ro 30 Beon-gil 107, Giheung-gu, Yongin-si, Gyeonggi-do, 16924, Republic of Korea.
| | - Chan-Wha Kim
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, 02841, Anam-dong, Seoungbuk-gu, Seoul, Republic of Korea.
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12
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Anis E, Newell TK, Dyer N, Wilkes RP. Phylogenetic analysis of the wild-type strains of canine distemper virus circulating in the United States. Virol J 2018; 15:118. [PMID: 30068352 PMCID: PMC6090796 DOI: 10.1186/s12985-018-1027-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Accepted: 07/17/2018] [Indexed: 12/14/2022] Open
Abstract
Background Canine distemper (CD) is a highly contagious, systemic, viral disease of dogs seen worldwide. Despite intensive vaccination in developed countries, recent reports suggest both the re-emergence and increased activity of Canine distemper virus (CDV) worldwide, including the United States. CDV is an RNA virus of the genus Morbillivirus within the family Paramyxoviridae. Viral genomic RNA encodes six structural proteins. Of the six structural proteins, the hemagglutinin (H) gene has the greatest genetic variation and is therefore a suitable target for molecular epidemiological studies. The majority of neutralizing epitopes are found on the H protein, making this gene also important for evaluation of changes over time that may result in antigenic differences among strains. The aim of this study was to determine the phylogenetic relationship of CDV strains circulating in the US. Methods Fifty-nine positive canine distemper virus samples collected from dogs from different regions and states from 2014 to 2017 were sequenced with a targeted next-generation sequencing (NGS) method. The sequences of the H, F, and P genes and the matrix-fusion (M-F) intergenic region of the amplified CDVs were analyzed individually. Results Sequence analysis of the H gene revealed that there are at least 3 different lineages of CDV currently circulating in the US. These lineages include America-3 (Edomex), America-4, and a clade that was previously reported in association with an outbreak in Wyoming, which was linked to a domestic dog-breeding facility in Kansas in 2010. These lineages differ from the historically identified lineages in the US, including America-1, which contains the majority of the vaccine strains. Genetic differences may result in significant changes to the neutralizing epitopes that consequently may lead to vaccine failure. Phylogenetic analyses of the nucleotide sequences obtained in this study of the F and P genes and the M-F intergenic region with sequences from the GenBank database produced similar findings to the H gene analysis. Conclusions The CDV lineages currently circulating in the US differ from the historically identified lineages America-1. Continuous surveillance is required for monitoring circulating CDV strains in the US, to prevent potential vaccine breakthrough events. Electronic supplementary material The online version of this article (10.1186/s12985-018-1027-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Eman Anis
- Tifton Veterinary Diagnostic and Investigational Laboratory, College of Veterinary Medicine, University of Georgia, PO Box 1389, 43 Brighton Rd, Tifton, GA, 31793, USA.,The Department of Virology, Faculty of Veterinary Medicine, University of Sadat, Sadat City, Egypt
| | - Teresa K Newell
- Veterinary Diagnostic Services Department, North Dakota State University, Dept. 7691, P.O. Box 6050, Fargo, North, Dakota, 58105, USA
| | - Neil Dyer
- Veterinary Diagnostic Services Department, North Dakota State University, Dept. 7691, P.O. Box 6050, Fargo, North, Dakota, 58105, USA
| | - Rebecca P Wilkes
- Tifton Veterinary Diagnostic and Investigational Laboratory, College of Veterinary Medicine, University of Georgia, PO Box 1389, 43 Brighton Rd, Tifton, GA, 31793, USA.
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13
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Tramuto F, Maida CM, Pojero F, Colomba GME, Casuccio A, Restivo V, Vitale F. Case-based surveillance of measles in Sicily during 2012-2017: The changing molecular epidemiology and implications for vaccine strategies. PLoS One 2018; 13:e0195256. [PMID: 29617454 PMCID: PMC5884552 DOI: 10.1371/journal.pone.0195256] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 03/19/2018] [Indexed: 12/26/2022] Open
Abstract
Following the indication of the World Health Organization, a national plan for the elimination of measles was approved in Italy and this included the improvement of the molecular surveillance of measles viruses and the interruption of indigenous transmission of the disease. Nevertheless, large outbreaks continue to occur in almost all regions of the country, including Sicily. Here we describe the epidemiology and molecular dynamics of measles viruses as a result of the measles surveillance activity carried out by the "Reference Laboratory for Measles and Rubella" in Sicily over a 5-year period. Biological samples of 259 suspected measles cases were tested for viral RNA detection and a total of 223 (86.1%) were classified as laboratory confirmed. The median age of confirmed measles cases was 21.0 years and about half of them were adults aged 19 years and older. Overall, one-third of the patients showed clinical complications and these latter were more common among adults than children (44.9% vs. 25.7%). The vast majority of measles cases were unvaccinated (94.2%, n = 210). The phylogenetic analysis of 221 measles virus nucleotide sequences revealed sporadic detections of genotypes D4 and H1, while endemic circulation of genotypes D8 and B3 was documented. Genotype D8 was associated with epidemics occurred between 2013 and 2016, whereas genotype B3 was more recently introduced into Sicily characterizing the current measles outbreak. The results of this study confirm the autochthonous co-circulation of viral variants belonging to different genotypes during the study period, and emphasizes the need of measles surveillance programmes in order to investigate the viral dynamics, the pathways of disease transmission, and to eventually adapt the development of successfull vaccine formulations.
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Affiliation(s)
- Fabio Tramuto
- Department of Health Promotion Sciences and Mother-Child Care “G. D’Alessandro” – Hygiene section, University of Palermo, Palermo, Italy
- Clinical Epidemiology Unit, University Hospital “Paolo Giaccone”, Palermo, Italy
- * E-mail:
| | - Carmelo Massimo Maida
- Department of Health Promotion Sciences and Mother-Child Care “G. D’Alessandro” – Hygiene section, University of Palermo, Palermo, Italy
- Clinical Epidemiology Unit, University Hospital “Paolo Giaccone”, Palermo, Italy
| | - Fanny Pojero
- Department of Health Promotion Sciences and Mother-Child Care “G. D’Alessandro” – Hygiene section, University of Palermo, Palermo, Italy
| | - Giuseppina Maria Elena Colomba
- Department of Health Promotion Sciences and Mother-Child Care “G. D’Alessandro” – Hygiene section, University of Palermo, Palermo, Italy
| | - Alessandra Casuccio
- Department of Health Promotion Sciences and Mother-Child Care “G. D’Alessandro” – Hygiene section, University of Palermo, Palermo, Italy
| | - Vincenzo Restivo
- Department of Health Promotion Sciences and Mother-Child Care “G. D’Alessandro” – Hygiene section, University of Palermo, Palermo, Italy
| | - Francesco Vitale
- Department of Health Promotion Sciences and Mother-Child Care “G. D’Alessandro” – Hygiene section, University of Palermo, Palermo, Italy
- Clinical Epidemiology Unit, University Hospital “Paolo Giaccone”, Palermo, Italy
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14
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Muñoz-Alía MÁ, Muller CP, Russell SJ. Hemagglutinin-specific neutralization of subacute sclerosing panencephalitis viruses. PLoS One 2018; 13:e0192245. [PMID: 29466428 PMCID: PMC5821319 DOI: 10.1371/journal.pone.0192245] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 01/18/2018] [Indexed: 12/31/2022] Open
Abstract
Subacute sclerosing panencephalitis (SSPE) is a progressive, lethal complication of measles caused by particular mutants of measles virus (MeV) that persist in the brain despite high levels of neutralizing antibodies. We addressed the hypothesis that antigenic drift is involved in the pathogenetic mechanism of SSPE by analyzing antigenic alterations in the MeV envelope hemagglutinin protein (MeV-H) found in patients with SSPE in relation to major circulating MeV genotypes. To this aim, we obtained cDNA for the MeV-H gene from tissue taken at brain autopsy from 3 deceased persons with SSPE who had short (3-4 months, SMa79), average (3.5 years, SMa84), and long (18 years, SMa94) disease courses. Recombinant MeVs with a substituted MeV-H gene were generated by a reverse genetic system. Virus neutralization assays with a panel of anti-MeV-H murine monoclonal antibodies (mAbs) or vaccine-immunized mouse anti-MeV-H polyclonal sera were performed to determine the antigenic relatedness. Functional and receptor-binding analysis of the SSPE MeV-H showed activity in a SLAM/nectin-4-dependent manner. Similar to our panel of wild-type viruses, our SSPE viruses showed an altered antigenic profile. Genotypes A, G3, and F (SSPE case SMa79) were the exception, with an intact antigenic structure. Genotypes D7 and F (SSPE SMa79) showed enhanced neutralization by mAbs targeting antigenic site IIa. Genotypes H1 and the recently reported D4.2 were the most antigenically altered genotypes. Epitope mapping of neutralizing mAbs BH015 and BH130 reveal a new antigenic site on MeV-H, which we designated Φ for its intermediate position between previously defined antigenic sites Ia and Ib. We conclude that SSPE-causing viruses show similar antigenic properties to currently circulating MeV genotypes. The absence of a direct correlation between antigenic changes and predisposition of a certain genotype to cause SSPE does not lend support to the proposed antigenic drift as a pathogenetic mechanism in SSPE.
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Affiliation(s)
- Miguel Ángel Muñoz-Alía
- Department of Molecular Medicine, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Claude P. Muller
- Department of Infection and Immunity, Luxembourg Institute of Health, Esch-Sur-Alzette (Grand Duchy of Luxembourg), Luxembourg
- Laboratoire National de Santé, Dudelange, Luxembourg
| | - Stephen J. Russell
- Department of Molecular Medicine, Mayo Clinic, Rochester, Minnesota, United States of America
- Division of Hematology, Mayo Clinic, Rochester, Minnesota, United States of America
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15
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Abstract
Antibodies have been used for over a century prophylactically and, less often, therapeutically against viruses. 'Super-antibodies' — a new generation of highly potent and/or broadly cross-reactive human monoclonal antibodies — offer new opportunities for prophylaxis and therapy of viral infections. Super-antibodies are typically generated infrequently and/or in a limited number of individuals during natural infections. Isolation of these antibodies has primarily been achieved by large-scale screening for suitable donors and new single B cell approaches to human monoclonal antibody generation. Super-antibodies may offer the possibility of treating multiple viruses of a given family with a single reagent. They are also valuable templates for rational vaccine design. The great potency of super-antibodies has many advantages for practical development as therapeutic reagents. These advantages can be enhanced by a variety of antibody engineering technologies.
So-called super-antibodies are highly potent, broadly reactive antiviral antibodies that offer promise for the treatment of various chronic and emerging viruses. This Review describes how recent technological advances led to their isolation from rare, infected individuals and their development for the prevention and treatment of various viral infections. Antibodies have been used for more than 100 years in the therapy of infectious diseases, but a new generation of highly potent and/or broadly cross-reactive human monoclonal antibodies (sometimes referred to as 'super-antibodies') offers new opportunities for intervention. The isolation of these antibodies, most of which are rarely induced in human infections, has primarily been achieved by large-scale screening for suitable donors and new single B cell approaches to human monoclonal antibody generation. Engineering the antibodies to improve half-life and effector functions has further augmented their in vivo activity in some cases. Super-antibodies offer promise for the prophylaxis and therapy of infections with a range of viruses, including those that are highly antigenically variable and those that are newly emerging or that have pandemic potential. The next few years will be decisive in the realization of the promise of super-antibodies.
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16
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Pfeffermann K, Dörr M, Zirkel F, von Messling V. Morbillivirus Pathogenesis and Virus-Host Interactions. Adv Virus Res 2018; 100:75-98. [PMID: 29551144 DOI: 10.1016/bs.aivir.2017.12.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Despite the availability of safe and effective vaccines against measles and several animal morbilliviruses, they continue to cause regular outbreaks and epidemics in susceptible populations. Morbilliviruses are highly contagious and share a similar pathogenesis in their respective hosts. This review provides an overview of morbillivirus history and the general replication cycle and recapitulates Morbillivirus pathogenesis focusing on common and unique aspects seen in different hosts. It also summarizes the state of knowledge regarding virus-host interactions on the cellular level with an emphasis on viral interference with innate immune response activation, and highlights remaining knowledge gaps.
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17
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Antigenic Drift Defines a New D4 Subgenotype of Measles Virus. J Virol 2017; 91:JVI.00209-17. [PMID: 28356529 DOI: 10.1128/jvi.00209-17] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Accepted: 03/19/2017] [Indexed: 01/25/2023] Open
Abstract
The measles virus hemagglutinin (MeV-H) protein is the main target of protective neutralizing antibodies. Using a panel of monoclonal antibodies (MAbs) that recognize known major antigenic sites in MeV-H, we identified a D4 genotype variant that escapes neutralization by MAbs targeting the neutralizing epitope (NE) antigenic site. By site-directed mutagenesis, L249P was identified as the critical mutation disrupting the NE in this genotype D4 variant. Forty-two available D4 genotype gene sequences were subsequently analyzed and divided into 2 groups according to the presence or absence of the L249P MeV-H mutation. Further analysis of the MeV-N gene sequences of these 2 groups confirmed that they represent clearly definable, sequence-divergent D4 subgenotypes, which we named subgenotypes D4.1 and D4.2. The subgenotype D4.1 MeVs were isolated predominantly in Kenya and Ethiopia, whereas the MAb-resistant subgenotype D4.2 MeVs were isolated predominantly in France and Great Britain, countries with higher vaccine coverage rates. Interestingly, D4.2 subgenotype viruses showed a trend toward diminished susceptibility to neutralization by human sera pooled from approximately 60 to 80 North American donors. Escape from MAb neutralization may be a powerful epidemiological surveillance tool to monitor the evolution of new MeV subgenotypes.IMPORTANCE Measles virus is a paradigmatic RNA virus, as the antigenic composition of the vaccination has not needed to be updated since its discovery. The vaccine confers protection by inducing neutralizing antibodies that interfere with the function of the hemagglutinin protein. Viral strains are indistinguishable serologically, although characteristic nucleotide sequences differentiate 24 genotypes. In this work, we describe a distant evolutionary branch within genotype D4. Designated subgenotype D4.2, this virus is distinguishable by neutralization with vaccine-induced monoclonal antibodies that target the neutralizing epitope (NE). The subgenotype D4.2 viruses have a higher predominance in countries with intermediary levels of vaccine coverage. Our studies demonstrate that subgenotype D4.2 lacks epitopes associated with half of the known antigenic sites, which significantly impacts our understanding of measles virus evolution.
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18
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Muñoz-Alía MA, Casasnovas JM, Celma ML, Carabaña J, Liton PB, Fernandez-Muñoz R. Measles Virus Hemagglutinin epitopes immunogenic in natural infection and vaccination are targeted by broad or genotype-specific neutralizing monoclonal antibodies. Virus Res 2017; 236:30-43. [PMID: 28465158 DOI: 10.1016/j.virusres.2017.04.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Revised: 04/24/2017] [Accepted: 04/24/2017] [Indexed: 11/27/2022]
Abstract
Measles virus (MV) remains a leading cause of vaccine-preventable deaths in children. Protection against MV is associated with neutralizing antibodies that preferentially recognize the viral hemagglutinin (MV-H), and to a lesser extent, the fusion protein (MV-F). Although MV is serologically monotypic, 24 genotypes have been identified. Here we report three neutralization epitopes conserved in the more prevalent circulating MV genotypes, two located in the MV-H receptor binding site (RBS) (antigenic site III) and a third in MV-H/MV-F interphase (antigenic site Ia) which are essential for MV multiplication. In contrast, two MV-H neutralization epitopes, showed a genotype-specific neutralization escape due to a single amino acid change, that we mapped in the "noose" antigenic site, or an enhanced neutralization epitope (antigenic site IIa). The monoclonal antibody (mAb) neutralization potency correlated with its binding affinity and was mainly driven by kinetic dissociation rate (koff). We developed an immunoassay for mAb binding to MV-H in its native hetero-oligomeric structure with MV-F on the surface of a MV productive steady-state persistently infected (p.i.) human cell lines, and a competitive-binding assay with serum from individuals with past infection by different MV genotypes. Binding assays revealed that a broad neutralization epitope, in RBS antigenic site, a genotype specific neutralization epitopes, in noose and IIa sites, were immunogenic in natural infection and vaccination and may elicit long-lasting humoral immunity that might contribute to explain MV immunogenic stability. These results support the design of improved measles vaccines, broad-spectrum prophylactic or therapeutic antibodies and MV-used in oncolytic therapies.
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Affiliation(s)
| | | | | | - Juan Carabaña
- Virology Unit, Ramón y Cajal Hospital, Madrid, Spain
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19
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Perspective on Global Measles Epidemiology and Control and the Role of Novel Vaccination Strategies. Viruses 2017; 9:v9010011. [PMID: 28106841 PMCID: PMC5294980 DOI: 10.3390/v9010011] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 01/10/2017] [Accepted: 01/10/2017] [Indexed: 12/21/2022] Open
Abstract
Measles is a highly contagious, vaccine preventable disease. Measles results in a systemic illness which causes profound immunosuppression often leading to severe complications. In 2010, the World Health Assembly declared that measles can and should be eradicated. Measles has been eliminated in the Region of the Americas, and the remaining five regions of the World Health Organization (WHO) have adopted measles elimination goals. Significant progress has been made through increased global coverage of first and second doses of measles-containing vaccine, leading to a decrease in global incidence of measles, and through improved case based surveillance supported by the WHO Global Measles and Rubella Laboratory Network. Improved vaccine delivery methods will likely play an important role in achieving measles elimination goals as these delivery methods circumvent many of the logistic issues associated with subcutaneous injection. This review highlights the status of global measles epidemiology, novel measles vaccination strategies, and describes the pathway toward measles elimination.
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20
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Tahara M, Takeda M. [Measles Virus]. Uirusu 2017; 67:3-16. [PMID: 29593149 DOI: 10.2222/jsv.67.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Measles virus (MeV) is exceptionally contagious and still a major cause of death in child.However, recently significant progress towards the elimination of measles has been made through increased vaccination coverage of measles-containing vaccines. The hemagglutinin (H) protein of MeV interacts with a cellular receptor, and this interaction is the first step of infection. MeV uses two different receptors, signaling lymphocyte activation molecule (SLAM) and nectin-4 expressed on immune cells and epithelial cells, respectively. The interactions of MeV with these receptors nicely explain the immune suppressive and high contagious properties of MeV. Binding of the H protein to a receptor triggers conformational changes in the fusion (F) protein, inducing fusion between viral and host plasma membranes for entry. The stalk region of the H protein plays a key role in the F protein-triggering. Recent studies of the H protein epitopes have revealed that the receptor binding site of the H protein constitutes a major neutralizing epitope. The interaction with two proteinaceous receptors probably imposes strong functional constraints on this epitope for amino acid changes. This would be a reason why measles vaccines, which are derived from MV strains isolated more than 60 years ago, are still highly effective against all MV strains currently circulating.
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Affiliation(s)
- Maino Tahara
- Department of Virology III, National Institute of Infectious Diseases
| | - Makoto Takeda
- Department of Virology III, National Institute of Infectious Diseases
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21
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Fatemi Nasab GS, Salimi V, Abbasi S, Adjami Nezhad Fard F, Mokhtari Azad T. Comparison of neutralizing antibody titers against outbreak-associated measles genotypes (D4, H1 and B3) in Iran. Pathog Dis 2016; 74:ftw089. [PMID: 27777263 DOI: 10.1093/femspd/ftw089] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/31/2016] [Indexed: 12/31/2022] Open
Abstract
Despite the accessibility of a promising vaccine, outbreaks of the measles virus (MV) take place even in well-vaccinated populations. D4, H1 and B3 genotypes have been detected regularly in different regions of Iran. These observations highlight the necessity of evaluating the protective efficacy of the vaccine against currently circulating MV genotypes during the elimination phase. A focus reduction neutralization test has been developed to measure the neutralizing antibodies against different genotypes of MV, such as H1, D4, B3 and vaccine strain (A), in children after second doses of measles vaccine. The geometric mean titer (GMT) rates of the sera against D4, H1, B3 and A genotypes were 95.9, 90.5, 32.0 and 76.1, respectively. Low GMTs of antibody against the B3 genotype compared with the other genotypes were indicated. Based on the current study results, the MV antibody titers in the sera of vaccinated cases are sufficient to neutralize all circulating genotypes in Iran; however, neutralizing antibody titers were lower for the B3 genotype than for the H1, D4 and A genotypes. The heterogeneous nature of MV, for instance the nucleotide sequence diversity between different strains, necessitates the evaluation of the protective efficacy of the vaccine against measles B3 genotype in countries where this virus has been the most commonly identified circulating genotype.
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Affiliation(s)
- Ghazal Sadat Fatemi Nasab
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran 14155, Iran
| | - Vahid Salimi
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran 14155, Iran
| | - Simin Abbasi
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran 14155, Iran
| | - Fatemeh Adjami Nezhad Fard
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran 14155, Iran
| | - Talat Mokhtari Azad
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran 14155, Iran
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22
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Hahné SJM, Nic Lochlainn LM, van Burgel ND, Kerkhof J, Sane J, Yap KB, van Binnendijk RS. Measles Outbreak Among Previously Immunized Healthcare Workers, the Netherlands, 2014. J Infect Dis 2016; 214:1980-1986. [PMID: 27923955 DOI: 10.1093/infdis/jiw480] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Accepted: 09/30/2016] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND We investigated a measles outbreak among healthcare workers (HCWs) by assessing laboratory characteristics, measles vaccine effectiveness, and serological correlates for protection. METHODS Cases were laboratory-confirmed measles in HCWs from hospital X during weeks 12-20 of 2014. We assessed cases' severity and infectiousness by using a questionnaire. We tested cases' sera for measles immunoglobulin M, immunoglobulin G, avidity, and plaque reduction neutralization (PRN). Throat swabs and oral fluid samples were tested by quantitative polymerase chain reaction. We calculated attack rates (ARs) by vaccination status and estimated measles vaccine effectiveness as 1 - [ARvaccinated/ARunvaccinated]. RESULTS Eight HCWs were notified as measles cases; 6 were vaccinated with measles vaccine twice, 1 was vaccinated once, and 1 was unvaccinated. All 6 twice-vaccinated cases had high avidity and PRN titers. None reported severe measles or onward transmission. Two of 4 investigated twice-vaccinated cases had pre-illness PRN titers of >120 mIU/mL. Among 106 potentially exposed HCWs, the estimated effectiveness of 2 doses of measles vaccine was 52% (95% confidence interval [CI], -207%-93%). CONCLUSIONS Measles occurred in 6 twice-vaccinated HCWs, despite 2 having adequate pre-exposure neutralizing antibodies. None of the twice-vaccinated cases had severe measles, and none had onward transmission, consistent with laboratory findings suggesting a secondary immune response. Improving 2-dose MMR coverage among HCWs would have likely reduced the size of this outbreak.
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Affiliation(s)
- Susan J M Hahné
- Center for Infectious Disease Control, National Institute for Public Health and the Environment, Bilthoven
| | - Laura M Nic Lochlainn
- Center for Infectious Disease Control, National Institute for Public Health and the Environment, Bilthoven.,European Programme for Intervention Epidemiology Training, European Centre for Disease Prevention and Control, Stockholm, Sweden
| | | | - Jeroen Kerkhof
- Center for Infectious Disease Control, National Institute for Public Health and the Environment, Bilthoven
| | - Jussi Sane
- Center for Infectious Disease Control, National Institute for Public Health and the Environment, Bilthoven.,European Programme for Intervention Epidemiology Training, European Centre for Disease Prevention and Control, Stockholm, Sweden
| | - Kioe Bing Yap
- Municipal Health Service Haaglanden, the Hague, The Netherlands
| | - Rob S van Binnendijk
- Center for Infectious Disease Control, National Institute for Public Health and the Environment, Bilthoven
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Measles Virus Hemagglutinin Protein Epitopes: The Basis of Antigenic Stability. Viruses 2016; 8:v8080216. [PMID: 27490564 PMCID: PMC4997578 DOI: 10.3390/v8080216] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 07/19/2016] [Accepted: 07/20/2016] [Indexed: 02/07/2023] Open
Abstract
Globally eliminating measles using available vaccines is biologically feasible because the measles virus (MV) hemagglutinin (H) protein is antigenically stable. The H protein is responsible for receptor binding, and is the main target of neutralizing antibodies. The immunodominant epitope, known as the hemagglutinating and noose epitope, is located near the receptor-binding site (RBS). The RBS also contains an immunodominant epitope. Loss of receptor binding correlates with an escape from the neutralization by antibodies that target the epitope at RBS. Another neutralizing epitope is located near RBS and is shielded by an N-linked sugar in certain genotype strains. However, human sera from vaccinees and measles patients neutralized all MV strains with similar efficiencies, regardless of the N-linked sugar modification or mutations at these epitopes. Two other major epitopes exist at a distance from RBS. One has an unstructured flexible domain with a linear neutralizing epitope. When MV-H forms a tetramer (dimer of dimers), these epitopes may form the dimer-dimer interface, and one of the two epitopes may also interact with the F protein. The neutralization mechanisms of antibodies that recognize these epitopes may involve inhibiting the H-F interaction or blocking the fusion cascade after MV-H binds to its receptors.
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Abstract
Measles is an infectious disease in humans caused by the measles virus (MeV). Before the introduction of an effective measles vaccine, virtually everyone experienced measles during childhood. Symptoms of measles include fever and maculopapular skin rash accompanied by cough, coryza and/or conjunctivitis. MeV causes immunosuppression, and severe sequelae of measles include pneumonia, gastroenteritis, blindness, measles inclusion body encephalitis and subacute sclerosing panencephalitis. Case confirmation depends on clinical presentation and results of laboratory tests, including the detection of anti-MeV IgM antibodies and/or viral RNA. All current measles vaccines contain a live attenuated strain of MeV, and great progress has been made to increase global vaccination coverage to drive down the incidence of measles. However, endemic transmission continues in many parts of the world. Measles remains a considerable cause of childhood mortality worldwide, with estimates that >100,000 fatal cases occur each year. Case fatality ratio estimates vary from <0.01% in industrialized countries to >5% in developing countries. All six WHO regions have set goals to eliminate endemic transmission of MeV by achieving and maintaining high levels of vaccination coverage accompanied by a sensitive surveillance system. Because of the availability of a highly effective and relatively inexpensive vaccine, the monotypic nature of the virus and the lack of an animal reservoir, measles is considered a candidate for eradication.
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25
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Holzmann H, Hengel H, Tenbusch M, Doerr HW. Eradication of measles: remaining challenges. Med Microbiol Immunol 2016; 205:201-8. [PMID: 26935826 PMCID: PMC4866980 DOI: 10.1007/s00430-016-0451-4] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 02/11/2016] [Indexed: 12/11/2022]
Abstract
Measles virus (MeV) is an aerosol-borne and one of the most contagious pathogenic viruses known. Almost every MeV infection becomes clinically manifest and can lead to serious and even fatal complications, especially under conditions of malnutrition in developing countries, where still 115,000 to 160,000 patients die from measles every year. There is no specific antiviral treatment. In addition, MeV infections cause long-lasting memory B and T cell impairment, predisposing people susceptible to opportunistic infections for years. A rare, but fatal long-term consequence of measles is subacute sclerosing panencephalitis. Fifteen years ago (2001), WHO has launched a programme to eliminate measles by a worldwide vaccination strategy. This is promising, because MeV is a human-specific morbillivirus (i.e. without relevant animal reservoir), safe and potent vaccine viruses are sufficiently produced since decades for common application, and millions of vaccine doses have been used globally without any indications of safety and efficacy issues. Though the prevalence of wild-type MeV infection has decreased by >90 % in Europe, measles is still not eliminated and has even re-emerged with recurrent outbreaks in developed countries, in which effective vaccination programmes had been installed for decades. Here, we discuss the crucial factors for a worldwide elimination of MeV: (1) efficacy of current vaccines, (2) the extremely high contagiosity of MeV demanding a >95 % vaccination rate based on two doses to avoid primary vaccine failure as well as the installation of catch-up vaccination programmes to fill immunity gaps and to achieve herd immunity, (3) the implications of sporadic cases of secondary vaccine failure, (4) organisation, acceptance and drawbacks of modern vaccination campaigns, (5) waning public attention to measles, but increasing concerns from vaccine-associated adverse reactions in societies with high socio-economic standards and (6) clinical, epidemiological and virological surveillance by the use of modern laboratory diagnostics and reporting systems. By consequent implementation of carefully designed epidemiologic and prophylactic measures, it should be possible to eradicate MeV globally out of mankind, as the closely related morbillivirus of rinderpest could be successfully eliminated out of the cattle on a global scale.
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Affiliation(s)
| | - Hartmut Hengel
- />Institute of Virology, University Medical Center, Albert-Ludwigs-University Freiburg, Freiburg, Germany
| | - Matthias Tenbusch
- />Department of Molecular and Medical Virology, Ruhr-University Bochum, Bochum, Germany
| | - H. W. Doerr
- />Institute for Medical Virology, Goethe-University Hospital Frankfurt, Frankfurt/M., Germany
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Beaty SM, Lee B. Constraints on the Genetic and Antigenic Variability of Measles Virus. Viruses 2016; 8:109. [PMID: 27110809 PMCID: PMC4848602 DOI: 10.3390/v8040109] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Revised: 04/06/2016] [Accepted: 04/14/2016] [Indexed: 01/04/2023] Open
Abstract
Antigenic drift and genetic variation are significantly constrained in measles virus (MeV). Genetic stability of MeV is exceptionally high, both in the lab and in the field, and few regions of the genome allow for rapid genetic change. The regions of the genome that are more tolerant of mutations (i.e., the untranslated regions and certain domains within the N, C, V, P, and M proteins) indicate genetic plasticity or structural flexibility in the encoded proteins. Our analysis reveals that strong constraints in the envelope proteins (F and H) allow for a single serotype despite known antigenic differences among its 24 genotypes. This review describes some of the many variables that limit the evolutionary rate of MeV. The high genomic stability of MeV appears to be a shared property of the Paramyxovirinae, suggesting a common mechanism that biologically restricts the rate of mutation.
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Affiliation(s)
- Shannon M Beaty
- Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.
| | - Benhur Lee
- Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.
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27
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Kanduc D. Measles virus hemagglutinin epitopes are potential hotspots for crossreactions with immunodeficiency-related proteins. Future Microbiol 2016; 10:503-15. [PMID: 25865190 DOI: 10.2217/fmb.14.137] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
AIMS Measles virus (MV) infection induces a protective immunity that is accompanied by a transient pathologic suppression of the immune system. This immunologic paradox remains unexplained in spite of the numerous hypotheses that have been advanced (i.e., cytokine production, soluble immunosuppressive factor, cell cycle block, signaling lymphocyte activation molecule receptor and MV infection of dendritic cells, among others). METHODS Searching for molecular link(s) between MV infection and host immunodeficiency, this study used the Immune Epitope DataBase to analyze the peptide sharing between the antigenic MV hemagglutinin (H) protein and human proteins associated with immunodeficiency. RESULTS It was found that the majority of MVH derived epitopes share several exact pentapeptide sequences with numerous human proteins involved in immune functions and immunodeficiency, such as B- and T-cell antigens, and complement components. CONCLUSION The data suggest that crossreactivity might contribute to our understanding of the link between MV immunogenicity and MV-induced immunosuppression, and highlight peptides unique to MV as a basis for developing effective and safe anti-MV vaccines.
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Bi Z, Xia X, Wang Y, Mei Y. Development and characterization of neutralizing monoclonal antibodies against canine distemper virus hemagglutinin protein. Microbiol Immunol 2016; 59:202-8. [PMID: 25644427 DOI: 10.1111/1348-0421.12238] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Revised: 01/23/2015] [Accepted: 01/28/2015] [Indexed: 11/29/2022]
Abstract
Canine distemper virus (CDV) causes a serious multisystemic disease in dogs and other carnivora. Hemagglutinin (H) protein-specific antibodies are mainly responsible for protective immunity against CDV infection. In the present study, six neutralizing MAbs to the H protein of CDV were newly obtained and characterized by immunizing BALB/c mice with a recent Chinese field isolate. Competitive binding inhibition assay revealed that they recognized four distinct antigenic regions of the H protein. Immunofluorescence assay and western blotting showed that all MAbs recognize the conformational rather than the linear epitopes of the H protein. Furthermore, in immunofluorescence and virus neutralization assays, two of the MAbs were found to react only with the recent Chinese field isolate and not with older CDV strains, including vaccine strain Onderstepoort, indicating there are neutralization-related antigenic variations between the recent Chinese field isolate and the older CDV strains examined in this study. The newly established MAbs are useful for differentiating the expanding CDV strains and could be used in immunotherapy and immunodiagnosis against infection with CDV.
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Affiliation(s)
- Zhenwei Bi
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, National Center for Engineering Research of Veterinary Bio-products, Nanjing, 210014, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, 225009, China
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29
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Logan N, McMonagle E, Drew AA, Takahashi E, McDonald M, Baron MD, Gilbert M, Cleaveland S, Haydon DT, Hosie MJ, Willett BJ. Efficient generation of vesicular stomatitis virus (VSV)-pseudotypes bearing morbilliviral glycoproteins and their use in quantifying virus neutralising antibodies. Vaccine 2015; 34:814-22. [PMID: 26706278 PMCID: PMC4742518 DOI: 10.1016/j.vaccine.2015.12.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Revised: 11/20/2015] [Accepted: 12/06/2015] [Indexed: 12/18/2022]
Abstract
Morbillivirus neutralising antibodies are traditionally measured using either plaque reduction neutralisation tests (PRNTs) or live virus microneutralisation tests (micro-NTs). While both test formats provide a reliable assessment of the strength and specificity of the humoral response, they are restricted by the limited number of viral strains that can be studied and often present significant biological safety concerns to the operator. In this study, we describe the adaptation of a replication-defective vesicular stomatitis virus (VSVΔG) based pseudotyping system for the measurement of morbillivirus neutralising antibodies. By expressing the haemagglutinin (H) and fusion (F) proteins of canine distemper virus (CDV) on VSVΔG pseudotypes bearing a luciferase marker gene, neutralising antibody titres could be measured rapidly and with high sensitivity. Further, by exchanging the glycoprotein expression construct, responses against distinct viral strains or species may be measured. Using this technique, we demonstrate cross neutralisation between CDV and peste des petits ruminants virus (PPRV). As an example of the value of the technique, we demonstrate that UK dogs vary in the breadth of immunity induced by CDV vaccination; in some dogs the neutralising response is CDV-specific while, in others, the neutralising response extends to the ruminant morbillivirus PPRV. This technique will facilitate a comprehensive comparison of cross-neutralisation to be conducted across the morbilliviruses.
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Affiliation(s)
- Nicola Logan
- MRC-University of Glasgow Centre for Virus Research, Garscube Estate, Glasgow G61 1QH, United Kingdom.
| | - Elizabeth McMonagle
- MRC-University of Glasgow Centre for Virus Research, Garscube Estate, Glasgow G61 1QH, United Kingdom.
| | - Angharad A Drew
- MRC-University of Glasgow Centre for Virus Research, Garscube Estate, Glasgow G61 1QH, United Kingdom.
| | - Emi Takahashi
- Royal Veterinary College, University of London, London NW1 0TU, United Kingdom.
| | - Michael McDonald
- Veterinary Diagnostic Services, University of Glasgow, Garscube Estate, Glasgow G61 1QH, United Kingdom.
| | - Michael D Baron
- The Pirbright Institute, Pirbright, Surrey GU24 0NF, United Kingdom.
| | - Martin Gilbert
- Wildlife Conservation Society, Bronx, NY, USA; Boyd Orr Centre for Population and Ecosystem Health, Institute of Biodiversity Animal Health and Comparative Medicine, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
| | - Sarah Cleaveland
- Boyd Orr Centre for Population and Ecosystem Health, Institute of Biodiversity Animal Health and Comparative Medicine, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
| | - Daniel T Haydon
- Boyd Orr Centre for Population and Ecosystem Health, Institute of Biodiversity Animal Health and Comparative Medicine, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
| | - Margaret J Hosie
- MRC-University of Glasgow Centre for Virus Research, Garscube Estate, Glasgow G61 1QH, United Kingdom.
| | - Brian J Willett
- MRC-University of Glasgow Centre for Virus Research, Garscube Estate, Glasgow G61 1QH, United Kingdom.
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30
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Harvala H, Wiman Å, Wallensten A, Zakikhany K, Englund H, Brytting M. Role of Sequencing the Measles Virus Hemagglutinin Gene and Hypervariable Region in the Measles Outbreak Investigations in Sweden During 2013–2014. J Infect Dis 2015; 213:592-9. [DOI: 10.1093/infdis/jiv434] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Accepted: 08/24/2015] [Indexed: 01/22/2023] Open
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31
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Kimura H, Saitoh M, Kobayashi M, Ishii H, Saraya T, Kurai D, Tsukagoshi H, Shirabe K, Nishina A, Kozawa K, Kuroda M, Takeuchi F, Sekizuka T, Minakami H, Ryo A, Takeda M. Molecular evolution of haemagglutinin (H) gene in measles virus. Sci Rep 2015; 5:11648. [PMID: 26130388 PMCID: PMC4486977 DOI: 10.1038/srep11648] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Accepted: 05/27/2015] [Indexed: 11/30/2022] Open
Abstract
We studied the molecular evolution of the haemagglutinin (H) gene (full length) in all genotypes (24 genotypes, 297 strains) of measles virus (MeV). The gene’s evolutionary timescale was estimated by the Bayesian Markov chain Monte Carlo (MCMC) method. We also analysed positive selection sites. The MCMC tree indicated that the MeV H gene diverged from the rinderpest virus (same genus) about 250 years ago and that 24 MeV genotypes formed 3 lineages dating back to a 1915 ancestor (95% highest posterior density [HPD] 1882–1941) with relatively rapid evolution (mean rate: 9.02 × 10−4 substitutions/site/year). The 3 lineages diverged in 1915 (lineage 1, 95% HPD 1882–1941), 1954 (lineage 2, 95% HPD 1937–1969), and 1940 (lineage 3, 95% HPD 1927–1952). These 24 genotypes may have diverged and emerged between the 1940s and 1990s. Selective pressure analysis identified many negative selection sites on the H protein but only a few positive selection sites, suggesting strongly operated structural and/or functional constraint of changes on the H protein. Based on the molecular evolution of H gene, an ancestor MeV of the 24 genotypes emerged about 100 years ago and the structure of H protein has been well conserved.
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Affiliation(s)
- Hirokazu Kimura
- Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Musashimurayama-shi, Tokyo 208-0011, Japan.,Department of Molecular Biodefence Research, Yokohama City University Graduate School of Medicine, Yokohama-shi, Kanagawa 236-0004, Japan
| | - Mika Saitoh
- Gunma Prefectural Institute of Public Health and Environmental Sciences, Maebashi-shi, Gunma 371-0052, Japan
| | - Miho Kobayashi
- Gunma Prefectural Institute of Public Health and Environmental Sciences, Maebashi-shi, Gunma 371-0052, Japan
| | - Haruyuki Ishii
- Department of Respiratory Medicine, Kyorin University, School of Medicine, Mitaka-shi, Tokyo 181-0004, Japan
| | - Takeshi Saraya
- Department of Respiratory Medicine, Kyorin University, School of Medicine, Mitaka-shi, Tokyo 181-0004, Japan
| | - Daisuke Kurai
- Department of Respiratory Medicine, Kyorin University, School of Medicine, Mitaka-shi, Tokyo 181-0004, Japan
| | - Hiroyuki Tsukagoshi
- Gunma Prefectural Institute of Public Health and Environmental Sciences, Maebashi-shi, Gunma 371-0052, Japan
| | - Komei Shirabe
- Yamaguchi Prefectural Institute of Public Health and Environment, Yamaguchi-shi, Yamaguchi 753-0821, Japan
| | - Atsuyoshi Nishina
- College of Science and Technology, Nihon University, Chiyoda-ku, Tokyo 101-8308, Japan
| | - Kunihisa Kozawa
- Gunma Prefectural Institute of Public Health and Environmental Sciences, Maebashi-shi, Gunma 371-0052, Japan
| | - Makoto Kuroda
- Pathogen Genomics Center, National Institute of Infectious Diseases, Musashimurayama-shi, Tokyo 208-0011, Japan
| | - Fumihiko Takeuchi
- Pathogen Genomics Center, National Institute of Infectious Diseases, Musashimurayama-shi, Tokyo 208-0011, Japan
| | - Tsuyoshi Sekizuka
- Pathogen Genomics Center, National Institute of Infectious Diseases, Musashimurayama-shi, Tokyo 208-0011, Japan
| | - Hisanori Minakami
- Department of Obstetrics, Hokkaido University Graduate School of Medicine, Sapporo-shi, Hokkaido 060-8638, Japan
| | - Akihide Ryo
- Department of Molecular Biodefence Research, Yokohama City University Graduate School of Medicine, Yokohama-shi, Kanagawa 236-0004, Japan
| | - Makoto Takeda
- Department of Virology III, National Institute of Infectious Diseases, Musashimurayama-shi, Tokyo 208-0011, Japan
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32
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Muñoz-Alía MÁ, Fernández-Muñoz R, Casasnovas JM, Porras-Mansilla R, Serrano-Pardo Á, Pagán I, Ordobás M, Ramírez R, Celma ML. Measles virus genetic evolution throughout an imported epidemic outbreak in a highly vaccinated population. Virus Res 2014; 196:122-7. [PMID: 25445338 DOI: 10.1016/j.virusres.2014.11.015] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Revised: 11/11/2014] [Accepted: 11/12/2014] [Indexed: 11/25/2022]
Abstract
Measles virus circulates endemically in African and Asian large urban populations, causing outbreaks worldwide in populations with up-to-95% immune protection. We studied the natural genetic variability of genotype B3.1 in a population with 95% vaccine coverage throughout an imported six month measles outbreak. From first pass viral isolates of 47 patients we performed direct sequencing of genomic cDNA. Whilst no variation from index case sequence occurred in the Nucleocapsid gene hyper-variable carboxy end, in the Hemagglutinin gene, main target for neutralizing antibodies, we observed gradual nucleotide divergence from index case along the outbreak (0% to 0.380%, average 0.138%) with the emergence of transient and persistent non-synonymous and synonymous mutations. Little or no variation was observed between the index and last outbreak cases in Phosphoprotein, Nucleocapsid, Matrix and Fusion genes. Most of the H non-synonymous mutations were mapped on the protein surface near antigenic and receptors binding sites. We estimated a MV-Hemagglutinin nucleotide substitution rate of 7.28 × 10-6 substitutions/site/day by a Bayesian phylogenetic analysis. The dN/dS analysis did not suggest significant immune or other selective pressures on the H gene during the outbreak. These results emphasize the usefulness of MV-H sequence analysis in measles epidemiological surveillance and elimination programs, and in detection of potentially emergence of measles virus neutralization-resistant mutants.
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Affiliation(s)
- Miguel Ángel Muñoz-Alía
- Virology Unit and National Reference Laboratory for Measles, Ramón y Cajal Hospital, Madrid, Spain
| | - Rafael Fernández-Muñoz
- Virology Unit and National Reference Laboratory for Measles, Ramón y Cajal Hospital, Madrid, Spain.
| | - José María Casasnovas
- Centro Nacional de Biotecnología, Laboratorio de Estructura de Proteínas. CSIC, Cantoblanco, Madrid, Spain
| | - Rebeca Porras-Mansilla
- Virology Unit and National Reference Laboratory for Measles, Ramón y Cajal Hospital, Madrid, Spain
| | - Ángela Serrano-Pardo
- Virology Unit and National Reference Laboratory for Measles, Ramón y Cajal Hospital, Madrid, Spain
| | - Israel Pagán
- Centro de Biotecnología y Genómica de Plantas UPM-INIA and ETSI Agrónomos, Campus Montegancedo, Madrid, Spain
| | - María Ordobás
- Epidemiology Service, Madrid Health Ministry, Madrid, Spain
| | - Rosa Ramírez
- Epidemiology Service, Madrid Health Ministry, Madrid, Spain
| | - María Luisa Celma
- Virology Unit and National Reference Laboratory for Measles, Ramón y Cajal Hospital, Madrid, Spain
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33
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Efficient replication of a paramyxovirus independent of full zippering of the fusion protein six-helix bundle domain. Proc Natl Acad Sci U S A 2014; 111:E3795-804. [PMID: 25157143 DOI: 10.1073/pnas.1403609111] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Enveloped viruses such as HIV and members of the paramyxovirus family use metastable, proteinaceous fusion machineries to merge the viral envelope with cellular membranes for infection. A hallmark of the fusogenic glycoproteins of these pathogens is refolding into a thermodynamically highly stable fusion core structure composed of six antiparallel α-helices, and this structure is considered instrumental for pore opening and/or enlargement. Using a paramyxovirus fusion (F) protein, we tested this paradigm by engineering covalently restricted F proteins that are predicted to be unable to close the six-helix bundle core structure fully. Several candidate bonds formed efficiently, resulting in F trimers and higher-order complexes containing covalently linked dimers. The engineered F complexes were incorporated into recombinant virions efficiently and were capable of refolding into a postfusion conformation without temporary or permanent disruption of the disulfide bonds. They efficiently formed fusion pores based on virus replication and quantitative cell-to-cell and virus-to-cell fusion assays. Complementation of these F mutants with a monomeric, fusion-inactive F variant enriched the F oligomers for heterotrimers containing a single disulfide bond, without affecting fusion complementation profiles compared with standard F protein. Our demonstration that complete closure of the fusion core does not drive paramyxovirus entry may aid the design of strategies for inhibiting virus entry.
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34
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Antibody neutralization of retargeted measles viruses. Virology 2014; 454-455:237-46. [PMID: 24725950 DOI: 10.1016/j.virol.2014.01.027] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Revised: 11/04/2013] [Accepted: 01/31/2014] [Indexed: 12/20/2022]
Abstract
The measles virus (MV) vaccine lineage is a promising oncolytic but prior exposure to the measles vaccine or wild-type MV strains limits treatment utility due to the presence of anti-measles antibodies. MV entry can be redirected by displaying a polypeptide ligand on the Hemagglutinin (H) C-terminus. We hypothesized that retargeted MV would escape neutralization by monoclonal antibodies (mAbs) recognizing the H receptor-binding surface and be less susceptible to neutralization by human antisera. Using chimeric H proteins, with and without mutations that ablate MV receptor binding, we show that retargeted MVs escape mAbs that target the H receptor-binding surface by virtue of mutations that ablate infection via SLAM and CD46. However, C-terminally displayed domains do not mediate virus entry in the presence of human antibodies that bind to the underlying H domain. In conclusion, utility of retargeted oncolytic measles viruses does not extend to evasion of human serum neutralization.
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35
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Mutations in the H, F, or M Proteins Can Facilitate Resistance of Measles Virus to Neutralizing Human Anti-MV Sera. Adv Virol 2014; 2014:205617. [PMID: 24648840 PMCID: PMC3932291 DOI: 10.1155/2014/205617] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Revised: 10/15/2013] [Accepted: 10/30/2013] [Indexed: 11/18/2022] Open
Abstract
Although there is currently no evidence of emerging strains of measles virus (MV) that can resist neutralization by the anti-MV antibodies present in vaccinees, certain mutations in circulating wt MV strains appear to reduce the efficacy of these antibodies. Moreover, it has been hypothesized that resistance to neutralization by such antibodies could allow MV to persist. In this study, we use a novel in vitro system to determine the molecular basis of MV's resistance to neutralization. We find that both wild-type and laboratory strain MV variants that escape neutralization by anti-MV polyclonal sera possess multiple mutations in their H, F, and M proteins. Cytometric analysis of cells expressing viral escape mutants possessing minimal mutations and their plasmid-expressed H, F, and M proteins indicates that immune resistance is due to particular mutations that can occur in any of these three proteins that affect at distance, rather than directly, the native conformation of the MV-H globular head and hence its epitopes. A high percentage of the escape mutants contain mutations found in cases of Subacute Sclerosing Panencephalitis (SSPE) and our results could potentially shed light on the pathogenesis of this rare fatal disease.
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36
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Affiliation(s)
- Devin Sok
- The Scripps Research Institute, La Jolla, CA 92037, USA
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37
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Xu S, Zhang Y, Zhu Z, Liu C, Mao N, Ji Y, Wang H, Jiang X, Li C, Tang W, Feng D, Wang C, Zheng L, Lei Y, Ling H, Zhao C, Ma Y, He J, Wang Y, Li P, Guan R, Zhou S, Zhou J, Wang S, Zhang H, Zheng H, Liu L, Ma H, Guan J, Lu P, Feng Y, Zhang Y, Zhou S, Xiong Y, Ba Z, Chen H, Yang X, Bo F, Ma Y, Liang Y, Lei Y, Gu S, Liu W, Chen M, Featherstone D, Jee Y, Bellini WJ, Rota PA, Xu W. Genetic characterization of the hemagglutinin genes of wild-type measles virus circulating in china, 1993-2009. PLoS One 2013; 8:e73374. [PMID: 24073194 PMCID: PMC3779233 DOI: 10.1371/journal.pone.0073374] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2012] [Accepted: 07/29/2013] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND China experienced several large measles outbreaks in the past two decades, and a series of enhanced control measures were implemented to achieve the goal of measles elimination. Molecular epidemiologic surveillance of wild-type measles viruses (MeV) provides valuable information about the viral transmission patterns. Since 1993, virologic surveillnace has confirmed that a single endemic genotype H1 viruses have been predominantly circulating in China. A component of molecular surveillance is to monitor the genetic characteristics of the hemagglutinin (H) gene of MeV, the major target for virus neutralizing antibodies. PRINCIPAL FINDINGS Analysis of the sequences of the complete H gene from 56 representative wild-type MeV strains circulating in China during 1993-2009 showed that the H gene sequences were clustered into 2 groups, cluster 1 and cluster 2. Cluster1 strains were the most frequently detected cluster and had a widespread distribution in China after 2000. The predicted amino acid sequences of the H protein were relatively conserved at most of the functionally significant amino acid positions. However, most of the genotype H1 cluster1 viruses had an amino acid substitution (Ser240Asn), which removed a predicted N-linked glycosylation site. In addition, the substitution of Pro397Leu in the hemagglutinin noose epitope (HNE) was identified in 23 of 56 strains. The evolutionary rate of the H gene of the genotype H1 viruses was estimated to be approximately 0.76×10(-3) substitutions per site per year, and the ratio of dN to dS (dN/dS) was <1 indicating the absence of selective pressure. CONCLUSIONS Although H genes of the genotype H1 strains were conserved and not subjected to selective pressure, several amino acid substitutions were observed in functionally important positions. Therefore the antigenic and genetic properties of H genes of wild-type MeVs should be monitored as part of routine molecular surveillance for measles in China.
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Affiliation(s)
- Songtao Xu
- Regional Reference Measles Laboratory for the WHO Western Pacific Region, Key Laboratory of Medical Virology Ministry of Health, National Institute for Viral Disease Control and Prevention, China Center for Disease Control and Prevention, Beijing, China
| | - Yan Zhang
- Regional Reference Measles Laboratory for the WHO Western Pacific Region, Key Laboratory of Medical Virology Ministry of Health, National Institute for Viral Disease Control and Prevention, China Center for Disease Control and Prevention, Beijing, China
| | - Zhen Zhu
- Regional Reference Measles Laboratory for the WHO Western Pacific Region, Key Laboratory of Medical Virology Ministry of Health, National Institute for Viral Disease Control and Prevention, China Center for Disease Control and Prevention, Beijing, China
| | - Chunyu Liu
- Division of Viral Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Naiying Mao
- Regional Reference Measles Laboratory for the WHO Western Pacific Region, Key Laboratory of Medical Virology Ministry of Health, National Institute for Viral Disease Control and Prevention, China Center for Disease Control and Prevention, Beijing, China
| | - Yixin Ji
- Regional Reference Measles Laboratory for the WHO Western Pacific Region, Key Laboratory of Medical Virology Ministry of Health, National Institute for Viral Disease Control and Prevention, China Center for Disease Control and Prevention, Beijing, China
| | - Huiling Wang
- Regional Reference Measles Laboratory for the WHO Western Pacific Region, Key Laboratory of Medical Virology Ministry of Health, National Institute for Viral Disease Control and Prevention, China Center for Disease Control and Prevention, Beijing, China
| | - Xiaohong Jiang
- Regional Reference Measles Laboratory for the WHO Western Pacific Region, Key Laboratory of Medical Virology Ministry of Health, National Institute for Viral Disease Control and Prevention, China Center for Disease Control and Prevention, Beijing, China
| | - Chongshan Li
- Shanghai Center for Disease Control and Prevention, Shanghai City, China
| | - Wei Tang
- Shanghai Center for Disease Control and Prevention, Shanghai City, China
| | - Daxing Feng
- Henan Center for Disease Control and Prevention, Zhengzhou City, Henan Province, China
| | - Changyin Wang
- Shandong Center for Disease Control and Prevention, Jinan City, Shandong Province, China
| | - Lei Zheng
- Shanxi Center for Disease Control and Prevention, Taiyuan City, Shanxi Province, China
| | - Yue Lei
- Tianjin Center for Disease Control and Prevention, Tianjin City, China
| | - Hua Ling
- Chongqing Center for Disease Control and Prevention, Chongqing City, China
| | - Chunfang Zhao
- Chongqing Center for Disease Control and Prevention, Chongqing City, China
| | - Yan Ma
- Hainan Center for Disease Control and Prevention, Haikou City, Hainan Province, China
| | - Jilan He
- Sichuan Center for Disease Control and Prevention, Chengdu City, Sichuan Province, China
| | - Yan Wang
- Liaoning Center for Disease Control and Prevention, Shenyang City, Liaoning Province, China
| | - Ping Li
- Shaanxi Center for Disease Control and Prevention, Xian City, Shannxi Province, China
| | - Ronghui Guan
- Shaanxi Center for Disease Control and Prevention, Xian City, Shannxi Province, China
| | - Shujie Zhou
- Anhui Center for Disease Control and Prevention, Hefei City, Anhui Province, China
| | - Jianhui Zhou
- Jilin Center for Disease Control and Prevention, Changchun City, Jilin Province, China
| | - Shuang Wang
- Jilin Center for Disease Control and Prevention, Changchun City, Jilin Province, China
| | - Hong Zhang
- Hunan Center for Disease Control and Prevention, Changsha City, Hunan Province, China
| | - Huanying Zheng
- Guangdong Center for Disease Control and Prevention, Guangzhou City, Guangzhou Province, China
| | - Leng Liu
- Guangdong Center for Disease Control and Prevention, Guangzhou City, Guangzhou Province, China
| | - Hemuti Ma
- Xinjiang Center for Disease Control and Prevention, Urumchi City, Xinjiang Province, China
| | - Jing Guan
- Xinjiang Center for Disease Control and Prevention, Urumchi City, Xinjiang Province, China
| | - Peishan Lu
- Jiangsu Center for Disease Control and Prevention, Nanjing City, Jiangsu Province, China
| | - Yan Feng
- Zhejiang Center for Disease Control and Prevention, Hangzhou City, Zhejiang Province, China
| | - Yanjun Zhang
- Zhejiang Center for Disease Control and Prevention, Hangzhou City, Zhejiang Province, China
| | - Shunde Zhou
- Jiangxi Center for Disease Control and Prevention, Nanchang City, Jiangxi Province, China
| | - Ying Xiong
- Jiangxi Center for Disease Control and Prevention, Nanchang City, Jiangxi Province, China
| | - Zhuoma Ba
- Qinghai Center for Disease Control and Prevention, Xining City, Qinghai Province, China
| | - Hui Chen
- Ningxia Center for Disease Control and Prevention, Yinchuan City, Ningxia Province, China
| | - Xiuhui Yang
- Fujian Center for Disease Control and Prevention, Fuzhou City, Fujian Province, China
| | - Fang Bo
- Heilongjiang Center for Disease Control and Prevention, Harbin City, Heilongjiang Province, China
| | - Yujie Ma
- Heilongjiang Center for Disease Control and Prevention, Harbin City, Heilongjiang Province, China
| | - Yong Liang
- Hebei Center for Disease Control and Prevention, Shijiazhuang City, Hebei Province, China
| | - Yake Lei
- Hubei Center for Disease Control and Prevention, Wuhan City, Hubei Province, China
| | - Suyi Gu
- Inner Mongolia Center for Disease Control and Prevention, Hohhot City, Inner Mongolia Province, China
| | - Wei Liu
- Guangxi Center for Disease Control and Prevention, Nanning City, Guangxi Province, China
| | - Meng Chen
- Beijing Center for Disease Control and Prevention, Beijing City, China
| | - David Featherstone
- Immunization, Vaccines and Biologicals, World Health Organization, Geneva, Switzerland
| | - Youngmee Jee
- Expanded Programme on Immunization, Western Pacific Regional Office, World Health Organization, Manila, Philippines
| | - William J. Bellini
- Division of Viral Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Paul A. Rota
- Division of Viral Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Wenbo Xu
- Regional Reference Measles Laboratory for the WHO Western Pacific Region, Key Laboratory of Medical Virology Ministry of Health, National Institute for Viral Disease Control and Prevention, China Center for Disease Control and Prevention, Beijing, China
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38
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A stabilized headless measles virus attachment protein stalk efficiently triggers membrane fusion. J Virol 2013; 87:11693-703. [PMID: 23966411 DOI: 10.1128/jvi.01945-13] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Paramyxovirus attachment and fusion (F) envelope glycoprotein complexes mediate membrane fusion required for viral entry. The measles virus (MeV) attachment (H) protein stalk domain is thought to directly engage F for fusion promotion. However, past attempts to generate truncated, fusion-triggering-competent H-stem constructs remained fruitless. In this study, we addressed the problem by testing the hypothesis that truncated MeV H stalks may require stabilizing oligomerization tags to maintain intracellular transport competence and F-triggering activity. We engineered H-stems of different lengths with added 4-helix bundle tetramerization domains and demonstrate restored cell surface expression, efficient interaction with F, and fusion promotion activity of these constructs. The stability of the 4-helix bundle tags and the relative orientations of the helical wheels of H-stems and oligomerization tags govern the kinetics of fusion promotion, revealing a balance between H stalk conformational stability and F-triggering activity. Recombinant MeV particles expressing a bioactive H-stem construct in the place of full-length H are viable, albeit severely growth impaired. Overall, we demonstrate that the MeV H stalk represents the effector domain for MeV F triggering. Fusion promotion appears linked to the conformational flexibility of the stalk, which must be tightly regulated in viral particles to ensure efficient virus entry. While the pathways toward assembly of functional fusion complexes may differ among diverse members of the paramyxovirus family, central elements of the triggering machinery emerge as highly conserved.
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39
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The receptor attachment function of measles virus hemagglutinin can be replaced with an autonomous protein that binds Her2/neu while maintaining its fusion-helper function. J Virol 2013; 87:6246-56. [PMID: 23536664 DOI: 10.1128/jvi.03298-12] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Cell entry of enveloped viruses is initiated by attachment to the virus receptor followed by fusion between the virus and host cell membranes. Measles virus (MV) attachment to its receptor is mediated by the hemagglutinin (H), which is thought to produce conformational changes in the membrane fusion protein (F) that trigger insertion of its fusion peptide into the target cell membrane. Here, we uncoupled receptor attachment and the fusion-helper function of H by introducing Y481A, R533A, S548L, and F549S mutations into the viral attachment protein that made it blind to its normal receptors. An artificial receptor attachment protein specific for Her2/neu was incorporated into the membranes of pseudotyped lentivirus particles as a separate transmembrane protein along with the F protein. Surprisingly, these particles entered efficiently into Her2/neu-positive SK-OV-3 as well as CHO-Her2 cells. Cell entry was independent of endocytosis but strictly dependent on the presence of H. H-specific monoclonal antibodies, as well as a mutation in H interfering with H/F cooperation, blocked cell entry. The particles mediated stable and specific transfer of reporter genes into Her2/neu-positive human tumor cells also in vivo, while exhibiting improved infectivity and higher titers than Her2/neu-targeted vectors displaying the targeting domain on H. Extending the current model of MV cell entry, the data suggest that receptor binding of H is not required for its fusion-helper function but that particle-cell contact in general may be sufficient to induce the conformational changes in the H/F complex and activate membrane fusion.
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The receptor-binding site of the measles virus hemagglutinin protein itself constitutes a conserved neutralizing epitope. J Virol 2013; 87:3583-6. [PMID: 23283964 DOI: 10.1128/jvi.03029-12] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Here, we provide direct evidence that the receptor-binding site of measles virus (MV) hemagglutinin protein itself forms an effective conserved neutralizing epitope (CNE). Several receptor-interacting residues constitute the CNE. Thus, viral escape from neutralization has to be associated with loss of receptor-binding activity. Since interactions with both the signaling lymphocyte activation molecule (SLAM) and nectin4 are critical for MV pathogenesis, its escape, which results from loss of receptor-binding activity, should not occur in nature.
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