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Cho WK, Choi HJ, Ma JY. Selaginella tamariscina Ethanol Extract Attenuates Influenza A Virus Infection by Inhibiting Hemagglutinin and Neuraminidase. Nutrients 2024; 16:2377. [PMID: 39064820 PMCID: PMC11280371 DOI: 10.3390/nu16142377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2024] [Revised: 07/08/2024] [Accepted: 07/11/2024] [Indexed: 07/28/2024] Open
Abstract
Selaginella tamariscina is a perennial plant that is used for diverse diseases. This study investigated whether Selaginella tamariscina has an antiviral effect against influenza A virus (IAV) infection. We used green fluorescent protein (GFP)-tagged influenza A virus (IAV) to examine the effect of Selaginella tamariscina ethanol extract (STE) on influenza viral infection. Fluorescence microscopy and flow cytometry showed that STE potently represses GFP expression by the virus, dose-dependently. STE significantly inhibited the expression of the IAV M2, NP, HA, NA, NS1, and PB2 proteins. Time-of-addition and hemagglutination inhibition assays showed that STE has an inhibitory effect on hemagglutinin and viral binding on the cells at an early infection time. In addition, STE exerted a suppressive effect on the neuraminidase activity of the H1N1 and H3N2 IAVs. Furthermore, dose-dependently, STE inhibited the cytopathic effect induced by H3N2, as well as by H1N1 IAV. Especially in the presence of 200 µg/mL STE, the cytopathic effect was completely blocked. Our findings suggest that STE has antiviral efficacy against IAV infection; thus, it could be developed as a natural IAV inhibitor.
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Affiliation(s)
- Won-Kyung Cho
- Korean Medicine (KM) Application Center, Korea Institute of Oriental Medicine, 70 Chemdanro, Dong-gu, Daegu 41062, Republic of Korea;
| | | | - Jin Yeul Ma
- Korean Medicine (KM) Application Center, Korea Institute of Oriental Medicine, 70 Chemdanro, Dong-gu, Daegu 41062, Republic of Korea;
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Le Sage V, Lowen AC, Lakdawala SS. Block the Spread: Barriers to Transmission of Influenza Viruses. Annu Rev Virol 2023; 10:347-370. [PMID: 37308086 DOI: 10.1146/annurev-virology-111821-115447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Respiratory viruses, such as influenza viruses, cause significant morbidity and mortality worldwide through seasonal epidemics and sporadic pandemics. Influenza viruses transmit through multiple modes including contact (either direct or through a contaminated surface) and inhalation of expelled aerosols. Successful human to human transmission requires an infected donor who expels virus into the environment, a susceptible recipient, and persistence of the expelled virus within the environment. The relative efficiency of each mode can be altered by viral features, environmental parameters, donor and recipient host characteristics, and viral persistence. Interventions to mitigate transmission of influenza viruses can target any of these factors. In this review, we discuss many aspects of influenza virus transmission, including the systems to study it, as well as the impact of natural barriers and various nonpharmaceutical and pharmaceutical interventions.
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Affiliation(s)
- Valerie Le Sage
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Anice C Lowen
- Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, Georgia, USA;
| | - Seema S Lakdawala
- Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, Georgia, USA;
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Predicting Permissive Mutations That Improve the Fitness of A(H1N1)pdm09 Viruses Bearing the H275Y Neuraminidase Substitution. J Virol 2022; 96:e0091822. [PMID: 35867563 PMCID: PMC9364793 DOI: 10.1128/jvi.00918-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Oseltamivir-resistant influenza viruses arise due to amino acid mutations in key residues of the viral neuraminidase (NA). These changes often come at a fitness cost; however, it is known that permissive mutations in the viral NA can overcome this cost. This result was observed in former seasonal A(H1N1) viruses in 2007 which expressed the H275Y substitution (N1 numbering) with no apparent fitness cost and lead to widespread oseltamivir resistance. Therefore, this study aims to predict permissive mutations that may similarly enable fit H275Y variants to arise in currently circulating A(H1N1)pdm09 viruses. The first approach in this study utilized in silico analyses to predict potentially permissive mutations. The second approach involved the generation of a virus library which encompassed all possible NA mutations while keeping H275Y fixed. Fit variants were then selected by serially passaging the virus library either through ferrets by transmission or passaging once in vitro. The fitness impact of selected substitutions was further evaluated experimentally. The computational approach predicted three candidate permissive NA mutations which, in combination with each other, restored the replicative fitness of an H275Y variant. The second approach identified a stringent bottleneck during transmission between ferrets; however, three further substitutions were identified which may improve transmissibility. A comparison of fit H275Y variants in vitro and in experimentally infected animals showed a statistically significant correlation in the variants that were positively selected. Overall, this study provides valuable tools and insights into potential permissive mutations that may facilitate the emergence of a fit H275Y A(H1N1)pdm09 variant. IMPORTANCE Oseltamivir (Tamiflu) is the most widely used antiviral for the treatment of influenza infections. Therefore, resistance to oseltamivir is a public health concern. This study is important as it explores the different evolutionary pathways available to current circulating influenza viruses that may lead to widespread oseltamivir resistance. Specifically, this study develops valuable experimental and computational tools to evaluate the fitness landscape of circulating A(H1N1)pmd09 influenza viruses bearing the H275Y mutation. The H275Y substitution is most commonly reported to confer oseltamivir resistance but also leads to loss of virus replication and transmission fitness, which limits its spread. However, it is known from previous influenza seasons that influenza viruses can evolve to overcome this loss of fitness. Therefore, this study aims to prospectively predict how contemporary A(H1N1)pmd09 influenza viruses may evolve to overcome the fitness cost of bearing the H275Y NA substitution, which could result in widespread oseltamivir resistance.
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Kanazawa R, Morimoto R, Horio Y, Sumitani H, Isegawa Y. Inhibition of influenza virus replication by Apiaceae plants, with special reference to Peucedanum japonicum (Sacna) constituents. JOURNAL OF ETHNOPHARMACOLOGY 2022; 292:115243. [PMID: 35358620 DOI: 10.1016/j.jep.2022.115243] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 03/16/2022] [Accepted: 03/25/2022] [Indexed: 06/14/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Apiaceae plants possess various pharmacological properties, such as antimicrobial, antioxidant, hypoglycemic, hypolipidemic, anxiolytic, analgesic, anti-inflammatory, anti-convulsant, and anti-cancer activities; however, data on their antiviral activity are limited. Peucedanum japonicum, also known as Sacna, is a plant used as food and as a traditional folk medicine for treating coughs. However, the active components in the leaves of this plant are yet unexplored. AIM OF THE STUDY To assess Apiaceae plants, especially Peucedanum japonicum, with anti-viral activity, and the function and antiviral potential of Sacna constituents, considering the emergence of influenza virus strains resistant to the currently available drugs. MATERIALS AND METHODS We prepared grinds of the freeze-dried leaves and roots of the Apiaceae family and the hot water extracts. The antiviral activities of the extracts were determined by focus formation reduction assay. In the time-of-addition assay, the test medium containing Sacna extract at 2 mg/mL was added at -1 to 0 h (adsorption) or from 0 to 4, 4 to 8, or 0 to 8 h (replication). The Sacna extract was separated by reversed-phase flash column chromatography using an Isolera Spektra system. The antiviral activity of each fraction was then determined using the focus formation reduction assay. The active fraction was analyzed using an LC20ADXR high performance liquid chromatography system equipped with a microTOF-QII quadrupole time-of-flight tandem mass spectrometer. RESULTS All examined extracts of Apiaceae plants showed anti-influenza activity. Sacna extract most strongly inhibited the replication of influenza viruses. Individual components of Sacna possess antiviral activities against the influenza A/PR/8/34 virus. Sacna was found to inhibit the multiplication of A (H1N1 and H3N2) types and B types of influenza viruses, including amantadine-resistant and oseltamivir-resistant viruses. Sacna also inhibited influenza infection during viral replication. However, Sacna did not inhibit influenza infection during cell adsorption and did not suppress hemagglutination inhibition or cell fusion. Further, our findings suggest that the antiviral compounds in Sacna include flavonoids (quercetin and luteolin) and other polyphenols (caffeic acid, hymecromone, and umbelliferone). Although several effective compounds in Sacna inhibit multiple steps of viral replication, caffeic acid, which was increased by heat treatment at the time of extraction, significantly inhibited only the late period of viral growth, similar to the Sacna extract, indicating that it is the major component responsible for the antiviral activity of Sacna. CONCLUSIONS Apiaceae plants possess antiviral activity. Caffeic acid is the major component responsible for the antiviral activity of Sacna. To our knowledge, this is the first report regarding the anti-influenza virus activity of Sacna. Overall, these results indicate that Sacna has potential as a novel treatment against influenza A and B viruses.
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Affiliation(s)
- Ryoko Kanazawa
- Department of Food Sciences and Nutrition, Mukogawa Women's University, Nishinomiya, Hyogo, 663-8558, Japan
| | - Ryosuke Morimoto
- Department of Food Sciences and Nutrition, Mukogawa Women's University, Nishinomiya, Hyogo, 663-8558, Japan
| | - Yuka Horio
- Department of Food Sciences and Nutrition, Mukogawa Women's University, Nishinomiya, Hyogo, 663-8558, Japan
| | - Hidenobu Sumitani
- Toyo Institute of Food Technology, Kawanishi, Hyogo, 666-0026, Japan
| | - Yuji Isegawa
- Department of Food Sciences and Nutrition, Mukogawa Women's University, Nishinomiya, Hyogo, 663-8558, Japan.
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5
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Cho WK, Yang HJ, Ma JY. Lotus (Nelumbo nucifera Gaertn.) leaf water extracts suppress influenza a viral infection via inhibition of neuraminidase and hemagglutinin. J Funct Foods 2022. [DOI: 10.1016/j.jff.2022.105019] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Hayden FG, Asher J, Cowling BJ, Hurt AC, Ikematsu H, Kuhlbusch K, Lemenuel-Diot A, Du Z, Meyers LA, Piedra PA, Takazono T, Yen HL, Monto AS. Reducing influenza virus transmission: the value of antiviral treatment. Clin Infect Dis 2021; 74:532-540. [PMID: 34245250 PMCID: PMC8834654 DOI: 10.1093/cid/ciab625] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Indexed: 11/16/2022] Open
Abstract
Prompt antiviral treatment has the potential to reduce influenza virus transmission to close contacts, but rigorous data on the magnitude of treatment effects on transmission are limited. Animal model data indicate that rapid reductions in viral replication after antiviral treatment reduce the risk of transmission. Observational and clinical trial data with oseltamivir and other neuraminidase inhibitors indicate that prompt treatment of household index patients seems to reduce the risk of illness in contacts, although the magnitude of the reported effects has varied widely across studies. In addition, the potential risk of transmitting drug-resistant variants exists with all approved classes of influenza antivirals. A controlled trial examining baloxavir treatment efficacy to reduce transmission, including the risk of transmitting virus with reduced baloxavir susceptibility, is currently in progress. If reduced transmission risk is confirmed, modeling studies indicate that early treatment could have major epidemiologic benefits in seasonal and pandemic influenza.
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Affiliation(s)
- Frederick G Hayden
- Department of Medicine, University of Virginia School of Medicine, Charlottesville, USA
| | | | - Benjamin J Cowling
- School of Public Health, The University of Hong Kong, Hong Kong Special Administrative Region, China
| | | | | | | | | | - Zhanwei Du
- School of Public Health, The University of Hong Kong, Hong Kong Special Administrative Region, China
| | - Lauren Ancel Meyers
- Department of Integrative Biology and Statistics & Data Sciences, University of Texas, Austin, Texas, USA
| | - Pedro A Piedra
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, USA
| | - Takahiro Takazono
- Department of Infectious Diseases, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Hui-Ling Yen
- School of Public Health, The University of Hong Kong, Hong Kong Special Administrative Region, China
| | - Arnold S Monto
- University of Michigan School of Public Health, Ann Arbor, Michigan, USA
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7
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Mehrbod P, Hudy D, Shyntum D, Markowski J, Łos MJ, Ghavami S. Quercetin as a Natural Therapeutic Candidate for the Treatment of Influenza Virus. Biomolecules 2020; 11:E10. [PMID: 33374214 PMCID: PMC7824064 DOI: 10.3390/biom11010010] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Revised: 12/16/2020] [Accepted: 12/21/2020] [Indexed: 12/12/2022] Open
Abstract
The medical burden caused by respiratory manifestations of influenza virus (IV) outbreak as an infectious respiratory disease is so great that governments in both developed and developing countries have allocated significant national budget toward the development of strategies for prevention, control, and treatment of this infection, which is seemingly common and treatable, but can be deadly. Frequent mutations in its genome structure often result in resistance to standard medications. Thus, new generations of treatments are critical to combat this ever-evolving infection. Plant materials and active compounds have been tested for many years, including, more recently, active compounds like flavonoids. Quercetin is a compound belonging to the flavonols class and has shown therapeutic effects against influenza virus. The focus of this review includes viral pathogenesis as well as the application of quercetin and its derivatives as a complementary therapy in controlling influenza and its related symptoms based on the targets. We also touch on the potential of this class of compounds for treatment of SARS-COV-2, the cause of new pandemic.
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Affiliation(s)
- Parvaneh Mehrbod
- Influenza and Respiratory Viruses Department, Pasteur Institute of Iran, Tehran 1316943551, Iran
| | - Dorota Hudy
- Department of Laryngology, Faculty of Health Sciences in Katowice, Medical University of Silesia, 40-027 Katowice, Poland; (D.H.); (J.M.)
| | - Divine Shyntum
- Biotechnology Center, Silesian University of Technology, 44-100 Gliwice, Poland;
| | - Jarosław Markowski
- Department of Laryngology, Faculty of Health Sciences in Katowice, Medical University of Silesia, 40-027 Katowice, Poland; (D.H.); (J.M.)
| | - Marek J. Łos
- Department of Pathology, Pomeranian Medical University, 71-344 Szczecin, Poland;
| | - Saeid Ghavami
- Department of Human Anatomy and Cell Science, Rady Faculty of Health Sciences, Max Rady College of Medicine, University of Manitoba, Winnipeg, MB R3E 0J9, Canada;
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Asadi S, Gaaloul ben Hnia N, Barre RS, Wexler AS, Ristenpart WD, Bouvier NM. Influenza A virus is transmissible via aerosolized fomites. Nat Commun 2020; 11:4062. [PMID: 32811826 PMCID: PMC7435178 DOI: 10.1038/s41467-020-17888-w] [Citation(s) in RCA: 68] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Accepted: 07/22/2020] [Indexed: 02/02/2023] Open
Abstract
Influenza viruses are presumed, but not conclusively known, to spread among humans by several possible routes. We provide evidence of a mode of transmission seldom considered for influenza: airborne virus transport on microscopic particles called "aerosolized fomites." In the guinea pig model of influenza virus transmission, we show that the airborne particulates produced by infected animals are mainly non-respiratory in origin. Surprisingly, we find that an uninfected, virus-immune guinea pig whose body is contaminated with influenza virus can transmit the virus through the air to a susceptible partner in a separate cage. We further demonstrate that aerosolized fomites can be generated from inanimate objects, such as by manually rubbing a paper tissue contaminated with influenza virus. Our data suggest that aerosolized fomites may contribute to influenza virus transmission in animal models of human influenza, if not among humans themselves, with important but understudied implications for public health.
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Affiliation(s)
- Sima Asadi
- grid.27860.3b0000 0004 1936 9684Department of Chemical Engineering, University of California Davis, One Shields Ave., Davis, CA 95616 USA
| | - Nassima Gaaloul ben Hnia
- grid.59734.3c0000 0001 0670 2351Department of Microbiology, Icahn School of Medicine at Mount Sinai, 1 Gustave L. Levy Place, New York, NY 10029 USA
| | - Ramya S. Barre
- grid.59734.3c0000 0001 0670 2351Department of Microbiology, Icahn School of Medicine at Mount Sinai, 1 Gustave L. Levy Place, New York, NY 10029 USA ,grid.16750.350000 0001 2097 5006Present Address: Department of Ecology and Evolutionary Biology, 304 Guyot Hall, Princeton University, Princeton, NJ 08544 USA
| | - Anthony S. Wexler
- grid.27860.3b0000 0004 1936 9684Department of Mechanical and Aerospace Engineering, University of California Davis, One Shields Ave., Davis, CA 95616 USA ,grid.27860.3b0000 0004 1936 9684Air Quality Research Center, University of California Davis, One Shields Ave., Davis, CA 95616 USA ,grid.27860.3b0000 0004 1936 9684Department of Civil and Environmental Engineering, University of California Davis, One Shields Ave., Davis, CA 95616 USA ,grid.27860.3b0000 0004 1936 9684Department of Land, Air and Water Resources, University of California Davis, One Shields Ave., Davis, CA 95616 USA
| | - William D. Ristenpart
- grid.27860.3b0000 0004 1936 9684Department of Chemical Engineering, University of California Davis, One Shields Ave., Davis, CA 95616 USA
| | - Nicole M. Bouvier
- grid.59734.3c0000 0001 0670 2351Department of Microbiology, Icahn School of Medicine at Mount Sinai, 1 Gustave L. Levy Place, New York, NY 10029 USA ,grid.59734.3c0000 0001 0670 2351Division of Infectious Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, 1 Gustave L. Levy Place, New York, NY 10029 USA
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Wang G, Dos Anjos Borges LG, Stadlbauer D, Ramos I, Bermúdez González MC, He J, Ding Y, Wei Z, Ouyang K, Huang W, Simon V, Fernandez-Sesma A, Krammer F, Nelson MI, Chen Y, García-Sastre A. Characterization of swine-origin H1N1 canine influenza viruses. Emerg Microbes Infect 2019; 8:1017-1026. [PMID: 31287780 PMCID: PMC7011970 DOI: 10.1080/22221751.2019.1637284] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Host switch events of influenza A viruses (IAVs) continuously pose a zoonotic threat to humans. In 2013, swine-origin H1N1 IAVs emerged in dogs soon after they were detected in swine in the Guangxi province of China. This host switch was followed by multiple reassortment events between these H1N1 and previously circulating H3N2 canine IAVs (IAVs-C) in dogs. To evaluate the phenotype of these newly identified viruses, we characterized three swine-origin H1N1 IAVs-C and one reassortant H1N1 IAV-C. We found that H1N1 IAVs-C predominantly bound to human-type receptors, efficiently transmitted via direct contact in guinea pigs and replicated in human lung cells. Moreover, the swine-origin H1N1 IAVs-C were lethal in mice and were transmissible by respiratory droplets in guinea pigs. Importantly, sporadic human infections with these viruses have been detected, and preexisting immunity in humans might not be sufficient to prevent infections with these new viruses. Our results show the potential of H1N1 IAVs-C to infect and transmit in humans, suggesting that these viruses should be closely monitored in the future.
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Affiliation(s)
- Guojun Wang
- a The State Key Laboratory of Reproductive Regulation and Breeding of Grassland Livestock, College of Life Sciences , Inner Mongolia University , Hohhot , People's Republic of China.,b Department of Microbiology , Icahn School of Medicine at Mount Sinai , New York , USA.,c Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai , New York , USA
| | - Luiz Gustavo Dos Anjos Borges
- b Department of Microbiology , Icahn School of Medicine at Mount Sinai , New York , USA.,c Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai , New York , USA
| | - Daniel Stadlbauer
- b Department of Microbiology , Icahn School of Medicine at Mount Sinai , New York , USA
| | - Irene Ramos
- b Department of Microbiology , Icahn School of Medicine at Mount Sinai , New York , USA
| | - Maria C Bermúdez González
- b Department of Microbiology , Icahn School of Medicine at Mount Sinai , New York , USA.,c Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai , New York , USA
| | - Jianqiao He
- d College of Animal Science and Technology , Guangxi University , Nanning , People's Republic of China
| | - Yangbao Ding
- d College of Animal Science and Technology , Guangxi University , Nanning , People's Republic of China
| | - Zuzhang Wei
- d College of Animal Science and Technology , Guangxi University , Nanning , People's Republic of China
| | - Kang Ouyang
- d College of Animal Science and Technology , Guangxi University , Nanning , People's Republic of China
| | - Weijian Huang
- d College of Animal Science and Technology , Guangxi University , Nanning , People's Republic of China
| | - Viviana Simon
- b Department of Microbiology , Icahn School of Medicine at Mount Sinai , New York , USA.,c Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai , New York , USA.,e Department of Medicine, Division of Infectious Diseases , Icahn School of Medicine at Mount Sinai , New York , USA
| | - Ana Fernandez-Sesma
- b Department of Microbiology , Icahn School of Medicine at Mount Sinai , New York , USA.,e Department of Medicine, Division of Infectious Diseases , Icahn School of Medicine at Mount Sinai , New York , USA
| | - Florian Krammer
- b Department of Microbiology , Icahn School of Medicine at Mount Sinai , New York , USA
| | - Martha I Nelson
- f Division of International Epidemiology and Population Studies, Fogarty International Center , National Institutes of Health , Bethesda , USA
| | - Ying Chen
- d College of Animal Science and Technology , Guangxi University , Nanning , People's Republic of China
| | - Adolfo García-Sastre
- b Department of Microbiology , Icahn School of Medicine at Mount Sinai , New York , USA.,c Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai , New York , USA.,e Department of Medicine, Division of Infectious Diseases , Icahn School of Medicine at Mount Sinai , New York , USA.,g The Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai , New York , USA
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10
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Novel Small Molecule Targeting the Hemagglutinin Stalk of Influenza Viruses. J Virol 2019; 93:JVI.00878-19. [PMID: 31167918 DOI: 10.1128/jvi.00878-19] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Accepted: 06/02/2019] [Indexed: 11/20/2022] Open
Abstract
Combating influenza is one of the perennial global public health issues to be managed. Antiviral drugs are useful for the treatment of influenza in the absence of an appropriate vaccine. However, the appearance of resistant strains necessitates a constant search for new drugs. In this study, we investigated novel anti-influenza drug candidates using in vitro and in vivo assays. We identified anti-influenza hit compounds using a high-throughput screening method with a green fluorescent protein-tagged recombinant influenza virus. Through subsequent analyses of their cytotoxicity and pharmacokinetic properties, one candidate (IY7640) was selected for further evaluation. In a replication kinetics analysis, IY7640 showed greater inhibitory effects during the early phase of viral infection than the viral neuraminidase inhibitor oseltamivir. In addition, we observed that hemagglutinin (HA)-mediated membrane fusion was inhibited by IY7640 treatment, indicating that the HA stalk region, which is highly conserved across various (sub)types of influenza viruses, may be the molecular target of IY7640. In an escape mutant analysis in cells, amino acid mutations were identified at the HA stalk region of the 2009 pandemic H1N1 (pH1N1) virus. Even though the in vivo efficacy of IY7640 did not reach complete protection in a lethal challenge study in mice, these results suggest that IY7640 has potential to be developed as a new type of anti-influenza drug.IMPORTANCE Anti-influenza drugs with broad-spectrum efficacy against antigenically diverse influenza viruses can be highly useful when no vaccines are available. To develop new anti-influenza drugs, we screened a number of small molecules and identified a strong candidate, IY7640. When added at the time of or after influenza virus infection, IY7640 was observed to successfully inhibit or reduce viral replication in cells. We subsequently discovered that IY7640 targets the stalk region of the influenza HA protein, which exhibits a relatively high degree of amino acid sequence conservation across various (sub)types of influenza viruses. Furthermore, IY7640 was observed to block HA-mediated membrane fusion of H1N1, H3N2, and influenza B viruses in cells. Although it appears less effective against strains other than H1N1 subtype viruses in a challenge study in mice, we suggest that the small molecule IY7640 has potential to be optimized as a new anti-influenza drug.
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11
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Takashita E, Morita H, Ogawa R, Nakamura K, Fujisaki S, Shirakura M, Kuwahara T, Kishida N, Watanabe S, Odagiri T. Susceptibility of Influenza Viruses to the Novel Cap-Dependent Endonuclease Inhibitor Baloxavir Marboxil. Front Microbiol 2018; 9:3026. [PMID: 30574137 PMCID: PMC6291754 DOI: 10.3389/fmicb.2018.03026] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Accepted: 11/22/2018] [Indexed: 01/17/2023] Open
Abstract
The novel cap-dependent endonuclease inhibitor baloxavir marboxil was approved for the treatment of influenza A and B virus infections in February 2018 in Japan. Because of the need to monitor influenza viruses for reduced susceptibility to this drug, we used two cell-based screening systems - a conventional plaque reduction assay and a focus reduction assay - to evaluate the susceptibility of influenza viruses to baloxavir. First, we generated a reference virus possessing an I38T substitution in the polymerase acidic subunit (PA), which is known to be associated with reduced susceptibility to baloxavir, and demonstrated the validity of our systems using this reference virus. We then determined the susceptibility of a panel of neuraminidase (NA) inhibitor-resistant viruses and their sensitive counterparts to baloxavir. No significant differences in baloxavir susceptibilities were found between the NA inhibitor-resistant and -sensitive viruses. We also examined seasonal influenza viruses isolated during the 2017-2018 influenza season in Japan and found that no currently circulating A(H1N1)pdm09, A(H3N2), or B viruses had significantly reduced susceptibility to baloxavir and none of the viruses possessed an amino acid substitution at PA residue 38. Use of a combination of methods to analyze antiviral susceptibility and detect amino acid substitutions is valuable for monitoring the emergence of baloxavir-resistant viruses.
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Affiliation(s)
- Emi Takashita
- Influenza Virus Research Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Hiroko Morita
- Influenza Virus Research Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Rie Ogawa
- Influenza Virus Research Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Kazuya Nakamura
- Influenza Virus Research Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Seiichiro Fujisaki
- Influenza Virus Research Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Masayuki Shirakura
- Influenza Virus Research Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Tomoko Kuwahara
- Influenza Virus Research Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Noriko Kishida
- Influenza Virus Research Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Shinji Watanabe
- Influenza Virus Research Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Takato Odagiri
- Influenza Virus Research Center, National Institute of Infectious Diseases, Tokyo, Japan
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12
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The Future of Influenza Vaccines: A Historical and Clinical Perspective. Vaccines (Basel) 2018; 6:vaccines6030058. [PMID: 30200179 PMCID: PMC6160951 DOI: 10.3390/vaccines6030058] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2018] [Revised: 08/21/2018] [Accepted: 08/27/2018] [Indexed: 12/16/2022] Open
Abstract
For centuries, the development of vaccines to prevent infectious disease was an empirical process. From smallpox variolation in Song dynasty China, through the polysaccharide capsule vaccines developed in the 1970s, vaccines were made either from the pathogen itself, treated in some way to render it attenuated or non-infectious, or from a closely related non-pathogenic strain. In recent decades, new scientific knowledge and technologies have enabled rational vaccine design in a way that was unimaginable before. However, vaccines optimal against some infectious diseases, influenza among them, have remained elusive. This review will highlight the challenges that influenza viruses pose for rational vaccine design. In particular, it will consider the clinically beneficial endpoints, beyond complete sterilizing immunity, that have been achieved with vaccines against other infectious diseases, as well as the barriers to achieving similar success against influenza.
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13
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Nagai E, Iwai M, Koketsu R, Sogabe R, Morimoto R, Suzuki Y, Ohta Y, Okuno Y, Ohshima A, Enomoto T, Isegawa Y. Inhibition of influenza virus replication by adlay tea. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2018; 98:1899-1905. [PMID: 28902408 DOI: 10.1002/jsfa.8671] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 09/02/2017] [Accepted: 09/04/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND The present study was conducted aiming to examine the antiviral activity of adlay tea and its components against influenza viruses. We further aimed to clarify the mechanism by which these components regulate virus replication. RESULTS Adlay tea at a concentration suitable for drinking inhibited the multiplication of influenza viruses. Moreover, our results suggest that individual components of the tea had antiviral activities against the influenza A/PR/8/34 virus. Adlay tea inhibited multiplication of the H1N1, H3N2 and B types of influenza virus, including oseltamivir-resistant viruses. In addition, adlay tea inhibited influenza infection during the periods of virus adsorption to the cell and virus replication. Adlay tea did not suppress hemagglutination inhibition or cell fusion, although it slightly inhibited virus binding to Malin Darby canine kidney cells. Furthermore, our findings suggest that the antiviral compounds included in adlay tea were ingredients other than polyphenols and that there were several types of effective compounds in adlay tea inhibiting several steps of viral replication. CONCLUSION The results of the present study demonstrate that adlay tea had antiviral effects against influenza viruses. Our findings with respect to adlay tea suggest that the polyphenols might have a small influence on its antiviral activity and that other ingredients might have more influence. © 2017 Society of Chemical Industry.
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Affiliation(s)
- Emiko Nagai
- Department of Food Sciences and Nutrition, Mukogawa Women's University, Nishinomiya, Hyogo, Japan
- Department of Food Science, Ishikawa Prefectural University, Nonoichi, Ishikawa, Japan
| | - Miwa Iwai
- Department of Food Sciences and Nutrition, Mukogawa Women's University, Nishinomiya, Hyogo, Japan
| | - Ritsuko Koketsu
- Research Foundation for Microbial Diseases of Osaka University, Suita, Osaka, Japan
| | - Riho Sogabe
- Department of Food Sciences and Nutrition, Mukogawa Women's University, Nishinomiya, Hyogo, Japan
| | - Ryosuke Morimoto
- Department of Food Sciences and Nutrition, Mukogawa Women's University, Nishinomiya, Hyogo, Japan
| | - Yuri Suzuki
- Department of Food Sciences and Nutrition, Mukogawa Women's University, Nishinomiya, Hyogo, Japan
| | | | - Yoshinobu Okuno
- Research Foundation for Microbial Diseases of Osaka University, Suita, Osaka, Japan
| | - Atsushi Ohshima
- Genomics Program, Nagahamabio Institute of Bio-Science and Technology, Nagahama, Shiga, Japan
| | - Toshiki Enomoto
- Department of Food Science, Ishikawa Prefectural University, Nonoichi, Ishikawa, Japan
| | - Yuji Isegawa
- Department of Food Sciences and Nutrition, Mukogawa Women's University, Nishinomiya, Hyogo, Japan
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14
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White KM, Abreu P, Wang H, De Jesus PD, Manicassamy B, García-Sastre A, Chanda SK, DeVita RJ, Shaw ML. Broad Spectrum Inhibitor of Influenza A and B Viruses Targeting the Viral Nucleoprotein. ACS Infect Dis 2018; 4:146-157. [PMID: 29268608 PMCID: PMC6145453 DOI: 10.1021/acsinfecdis.7b00120] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
S119 was a top hit from an ultrahigh throughput screen performed to identify novel inhibitors of influenza virus replication. It showed a potent antiviral effect (50% inhibitory concentration, IC50 = 20 nM) and no detectable cytotoxicity (50% cytotoxic concentration, CC50 > 500 μM) to yield a selectivity index greater than 25 000. Upon investigation, we found that S119 selected for resistant viruses carrying mutations in the viral nucleoprotein (NP). These resistance mutations highlight a likely S119 binding site overlapping with but not identical to that found for the compound nucleozin. Mechanism of action studies revealed that S119 affects both the oligomerization state and cellular localization of the NP protein which has an impact on viral transcription, replication, and protein expression. Through a hit-to-lead structure-activity relationship (SAR) study, we found an analog of S119, named S119-8, which had increased breadth of inhibition against influenza A and B viruses accompanied by only a small loss in potency. Finally, in vitro viral inhibition assays showed a synergistic relationship between S119-8 and oseltamivir when they were combined, indicating the potential for future drug cocktails.
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Affiliation(s)
- Kris M. White
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, New York 10029, United States
| | - Pablo Abreu
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, New York 10029, United States
| | - Hui Wang
- Department of Pharmacological Sciences, Infectious and Inflammatory Disease Center, Sanford Burnham Prebys Medical Discovery Institute, 10901 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Paul D. De Jesus
- Immunity and Pathogenesis Program, Infectious and Inflammatory Disease Center, Sanford Burnham Prebys Medical Discovery Institute, 10901 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Balaji Manicassamy
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, New York 10029, United States
| | - Adolfo García-Sastre
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, New York 10029, United States
- Department of Medicine, Division of Infectious Diseases, Icahn School of Medicine at Mount Sinai, New York, New York 10029, United States
- Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai, New York, New York 10029, United States
| | - Sumit K. Chanda
- Immunity and Pathogenesis Program, Infectious and Inflammatory Disease Center, Sanford Burnham Prebys Medical Discovery Institute, 10901 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Robert J. DeVita
- Department of Pharmacological Sciences, Infectious and Inflammatory Disease Center, Sanford Burnham Prebys Medical Discovery Institute, 10901 North Torrey Pines Road, La Jolla, California 92037, United States
- Drug Discovery Institute, Icahn School of Medicine at Mount Sinai, New York, New York 10029, United States
| | - Megan L. Shaw
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, New York 10029, United States
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15
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Ormond L, Liu P, Matuszewski S, Renzette N, Bank C, Zeldovich K, Bolon DN, Kowalik TF, Finberg RW, Jensen JD, Wang JP. The Combined Effect of Oseltamivir and Favipiravir on Influenza A Virus Evolution. Genome Biol Evol 2017; 9:1913-1924. [PMID: 28854600 PMCID: PMC5570085 DOI: 10.1093/gbe/evx138] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/18/2017] [Indexed: 01/14/2023] Open
Abstract
Influenza virus inflicts a heavy death toll annually and resistance to existing antiviral drugs has generated interest in the development of agents with novel mechanisms of action. Favipiravir is an antiviral drug that acts by increasing the genome-wide mutation rate of influenza A virus (IAV). Potential synergistic benefits of combining oseltamivir and favipiravir have been demonstrated in animal models of influenza, but the population-level effects of combining the drugs are unknown. In order to elucidate the underlying evolutionary processes at play, we performed genome-wide sequencing of IAV experimental populations subjected to serial passaging in vitro under a combined protocol of oseltamivir and favipiravir. We describe the interplay between mutation, selection, and genetic drift that ultimately culminates in population extinction. In particular, selective sweeps around oseltamivir resistance mutations reduce genome-wide variation while deleterious mutations hitchhike to fixation given the increased mutational load generated by favipiravir. This latter effect reduces viral fitness and accelerates extinction compared with IAV populations treated with favipiravir alone, but risks spreading both established and newly emerging mutations, including possible drug resistance mutations, if transmission occurs before the viral populations are eradicated.
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Affiliation(s)
- Louise Ormond
- École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.,Swiss Institute of Bioinformatics (SIB), Lausanne, Switzerland
| | - Ping Liu
- Department of Medicine, University of Massachusetts Medical School
| | - Sebastian Matuszewski
- École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.,Swiss Institute of Bioinformatics (SIB), Lausanne, Switzerland
| | - Nicholas Renzette
- Swiss Institute of Bioinformatics (SIB), Lausanne, Switzerland.,Department of Microbiology and Physiological Systems, University of Massachusetts Medical School
| | - Claudia Bank
- École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.,Swiss Institute of Bioinformatics (SIB), Lausanne, Switzerland.,Instituto Gulbenkian de Ciência, Oeiras, Portugal
| | - Konstantin Zeldovich
- Program in Bioinformatics and Integrative Biology, University of Massachusetts Medical School
| | - Daniel N Bolon
- Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School
| | - Timothy F Kowalik
- Department of Microbiology and Physiological Systems, University of Massachusetts Medical School
| | - Robert W Finberg
- Department of Medicine, University of Massachusetts Medical School
| | - Jeffrey D Jensen
- École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.,Swiss Institute of Bioinformatics (SIB), Lausanne, Switzerland.,School of Life Sciences, Center for Evolution & Medicine, Arizona State University
| | - Jennifer P Wang
- Department of Medicine, University of Massachusetts Medical School
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16
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Genomic signature analysis of the recently emerged highly pathogenic A(H5N8) avian influenza virus: implying an evolutionary trend for bird-to-human transmission. Microbes Infect 2017; 19:597-604. [PMID: 28889970 DOI: 10.1016/j.micinf.2017.08.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Revised: 08/14/2017] [Accepted: 08/18/2017] [Indexed: 11/20/2022]
Abstract
In early 2014, a novel subclade (2.3.4.4) of the highly pathogenic avian influenza (HPAI) A(H5N8) virus caused the first outbreak in domestic ducks and migratory birds in South Korea. Since then, it has spread to 44 countries and regions. To date, no human infections with A(H5N8) virus have been reported, but the possibility cannot be excluded. By analyzing the genomic signatures of A(H5N8) strains, we found that among the 47 species-associated signature positions, three positions exhibited human-like signatures (HLS), including PA-404S, PB2-613I and PB2-702R and that mutation trend of host signatures of avian A(H5N8) is different before and after 2014. About 82% of A(H5N8) isolates collected after January of 2014 carried the 3 HLS (PA-404S/PB2-613I/PB2-702R) in combination, while none of isolates collected before 2014 had this combination. Furthermore, the HA protein had S137A and S227R substitutions in the receptor-binding site and A160T in the glycosylation site, potentially increasing viral ability to bind human-type receptors. Based on these findings, the newly emerged HPAI A(H5N8) isolates show an evolutionary trend toward gaining more HLS and, along with it, the potential for bird-to-human transmissibility. Therefore, more extensive surveillance of this rapidly spreading HPAI A(H5N8) and preparedness against its potential pandemic are urgently needed.
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17
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Ho BS, Chao KM. Data-driven interdisciplinary mathematical modelling quantitatively unveils competition dynamics of co-circulating influenza strains. J Transl Med 2017; 15:163. [PMID: 28754164 PMCID: PMC5534049 DOI: 10.1186/s12967-017-1269-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Accepted: 07/20/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Co-circulation of influenza strains is common to seasonal epidemics and pandemic emergence. Competition was considered involved in the vicissitudes of co-circulating influenza strains but never quantitatively studied at the human population level. The main purpose of the study was to explore the competition dynamics of co-circulating influenza strains in a quantitative way. METHODS We constructed a heterogeneous dynamic transmission model and ran the model to fit the weekly A/H1N1 influenza virus isolation rate through an influenza season. The construction process started on the 2007-2008 single-clade influenza season and, with the contribution from the clade-based A/H1N1 epidemiological curves, advanced to the 2008-2009 two-clade influenza season. Pearson method was used to estimate the correlation coefficient between the simulated epidemic curve and the observed weekly A/H1N1 influenza virus isolation rate curve. RESULTS The model found the potentially best-fit simulation with correlation coefficient up to 96% and all the successful simulations converging to the best-fit. The annual effective reproductive number of each co-circulating influenza strain was estimated. We found that, during the 2008-2009 influenza season, the annual effective reproductive number of the succeeding A/H1N1 clade 2B-2, carrying H275Y mutation in the neuraminidase, was estimated around 1.65. As to the preceding A/H1N1 clade 2C-2, the annual effective reproductive number would originally be equivalent to 1.65 but finally took on around 0.75 after the emergence of clade 2B-2. The model reported that clade 2B-2 outcompeted for the 2008-2009 influenza season mainly because clade 2C-2 suffered from a reduction of transmission fitness of around 71% on encountering the former. CONCLUSIONS We conclude that interdisciplinary data-driven mathematical modelling could bring to light the transmission dynamics of the A/H1N1 H275Y strains during the 2007-2009 influenza seasons worldwide and may inspire us to tackle the continually emerging drug-resistant A/H1N1pdm09 strains. Furthermore, we provide a prospective approach through mathematical modelling to solving a seemingly unintelligible problem at the human population level and look forward to its application at molecular level through bridging the resolution capacities of related disciplines.
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Affiliation(s)
- Bin-Shenq Ho
- Department of Computer Science and Information Engineering, National Taiwan University, Taipei, Taiwan, ROC.,Public Health Bureau, Hsinchu, Taiwan, ROC.,Taiwan Centers for Disease Control, Taipei, Taiwan, ROC
| | - Kun-Mao Chao
- Department of Computer Science and Information Engineering, National Taiwan University, Taipei, Taiwan, ROC. .,Graduate Institute of Biomedical Electronics and Bioinformatics, National Taiwan University, Taipei, Taiwan, ROC.
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18
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Holthausen DJ, Lee SH, Kumar VTV, Bouvier NM, Krammer F, Ellebedy AH, Wrammert J, Lowen AC, George S, Pillai MR, Jacob J. An Amphibian Host Defense Peptide Is Virucidal for Human H1 Hemagglutinin-Bearing Influenza Viruses. Immunity 2017; 46:587-595. [DOI: 10.1016/j.immuni.2017.03.018] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Revised: 02/02/2017] [Accepted: 02/16/2017] [Indexed: 01/11/2023]
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19
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Gao Z, Niikura M, Withers SG. Ultrasensitive Fluorogenic Reagents for Neuraminidase Titration. Angew Chem Int Ed Engl 2017; 56:6112-6116. [PMID: 28191709 DOI: 10.1002/anie.201610544] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Indexed: 11/07/2022]
Abstract
Influenza viral neuraminidase plays a crucial role during infections. It is a major target for the development of anti-influenza drugs and is also attracting increasing attention as a vaccine target as evidence accumulates that neuraminidase-neutralizing antibodies contribute to protection. However, no method currently exists to accurately and efficiently measure concentrations of active neuraminidase in virus samples or other crude mixtures, which hampers development on both fronts. In this report, we describe the development of a selective and sensitive active-site titration reagent for neuraminidase that can quantify viral neuraminidases down to sub-nanomolar levels in crude samples, with no background from non-viral neuraminidases. By using this reagent, we determined accurate kcat values for six influenza A and two influenza B neuraminidases for the first time. We also quantified the neuraminidase content in a commercial influenza vaccine, thus demonstrating that this titration reagent opens the possibility for better vaccine analysis.
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Affiliation(s)
- Zhizeng Gao
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia, V6T 1Z1, Canada
| | - Masahiro Niikura
- Faculty of Health Sciences, Simon Fraser University, Burnaby, British Columbia, V5A 1S6, Canada
| | - Stephen G Withers
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia, V6T 1Z1, Canada
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20
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Gao Z, Niikura M, Withers SG. Ultrasensitive Fluorogenic Reagents for Neuraminidase Titration. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201610544] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Zhizeng Gao
- Department of Chemistry; University of British Columbia; Vancouver British Columbia V6T 1Z1 Canada
| | - Masahiro Niikura
- Faculty of Health Sciences; Simon Fraser University; Burnaby British Columbia V5A 1S6 Canada
| | - Stephen G. Withers
- Department of Chemistry; University of British Columbia; Vancouver British Columbia V6T 1Z1 Canada
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21
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Bank C, Renzette N, Liu P, Matuszewski S, Shim H, Foll M, Bolon DNA, Zeldovich KB, Kowalik TF, Finberg RW, Wang JP, Jensen JD. An experimental evaluation of drug-induced mutational meltdown as an antiviral treatment strategy. Evolution 2016; 70:2470-2484. [PMID: 27566611 DOI: 10.1111/evo.13041] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Revised: 08/08/2016] [Accepted: 08/08/2016] [Indexed: 12/24/2022]
Abstract
The rapid evolution of drug resistance remains a critical public health concern. The treatment of influenza A virus (IAV) has proven particularly challenging, due to the ability of the virus to develop resistance against current antivirals and vaccines. Here, we evaluate a novel antiviral drug therapy, favipiravir, for which the mechanism of action in IAV involves an interaction with the viral RNA-dependent RNA polymerase resulting in an effective increase in the viral mutation rate. We used an experimental evolution framework, combined with novel population genetic method development for inference from time-sampled data, to evaluate the effectiveness of favipiravir against IAV. Evaluating whole genome polymorphism data across 15 time points under multiple drug concentrations and in controls, we present the first evidence for the ability of IAV populations to effectively adapt to low concentrations of favipiravir. In contrast, under high concentrations, we observe population extinction, indicative of mutational meltdown. We discuss the observed dynamics with respect to the evolutionary forces at play and emphasize the utility of evolutionary theory to inform drug development.
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Affiliation(s)
- Claudia Bank
- School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
- Swiss Institute of Bioinformatics (SIB), Lausanne, Switzerland
- Current Adrress: Instituto Gulbenkian de Ciencia, Oeiras, Portugal
| | - Nicholas Renzette
- Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, Massachusetts, 01605
| | - Ping Liu
- Department of Medicine, University of Massachusetts Medical School, Worcester, Massachusetts, 01605
| | - Sebastian Matuszewski
- School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
- Swiss Institute of Bioinformatics (SIB), Lausanne, Switzerland
| | - Hyunjin Shim
- School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
- Swiss Institute of Bioinformatics (SIB), Lausanne, Switzerland
| | - Matthieu Foll
- School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
- Swiss Institute of Bioinformatics (SIB), Lausanne, Switzerland
- Current Address: Genetic Cancer Susceptibility, International Agency for Research on Cancer, Lyon, France
| | - Daniel N A Bolon
- Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts, 01605
| | - Konstantin B Zeldovich
- Program in Bioinformatics and Integrative Biology, University of Massachusetts Medical School, Worcester, Massachusetts, 01605
| | - Timothy F Kowalik
- Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, Massachusetts, 01605
| | - Robert W Finberg
- Department of Medicine, University of Massachusetts Medical School, Worcester, Massachusetts, 01605
| | - Jennifer P Wang
- Department of Medicine, University of Massachusetts Medical School, Worcester, Massachusetts, 01605.
| | - Jeffrey D Jensen
- School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- Swiss Institute of Bioinformatics (SIB), Lausanne, Switzerland.
- Current Address: School of Life Sciences, Arizona State University, Tempe, Arizona, 85287.
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22
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Transmission and pathogenicity of novel reassortants derived from Eurasian avian-like and 2009 pandemic H1N1 influenza viruses in mice and guinea pigs. Sci Rep 2016; 6:27067. [PMID: 27252023 PMCID: PMC4890009 DOI: 10.1038/srep27067] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Accepted: 04/20/2016] [Indexed: 11/08/2022] Open
Abstract
Given the present extensive co-circulation in pigs of Eurasian avian-like (EA) swine H1N1 and 2009 pandemic (pdm/09) H1N1 viruses, reassortment between them is highly plausible but largely uncharacterized. Here, experimentally co-infected pigs with a representative EA virus and a pdm/09 virus yielded 55 novel reassortant viruses that could be categorized into 17 genotypes from Gt1 to Gt17 based on segment segregation. Majority of novel reassortants were isolated from the lower respiratory tract. Most of reassortant viruses were more pathogenic and contagious than the parental EA viruses in mice and guinea pigs. The most transmissible reassortant genotypes demonstrated in guinea pigs (Gt2, Gt3, Gt7, Gt10 and Gt13) were also the most lethal in mice. Notably, nearly all these highly virulent reassortants (all except Gt13) were characterized with possession of EA H1 and full complement of pdm/09 ribonucleoprotein genes. Compositionally, we demonstrated that EA H1-222G contributed to virulence by its ability to bind avian-type sialic acid receptors, and that pdm/09 RNP conferred the most robust polymerase activity to reassortants. The present study revealed high reassortment compatibility between EA and pdm/09 viruses in pigs, which could give rise to progeny reassortant viruses with enhanced virulence and transmissibility in mice and guinea pig models.
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23
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Animal models for influenza virus transmission studies: a historical perspective. Curr Opin Virol 2015; 13:101-8. [PMID: 26126082 DOI: 10.1016/j.coviro.2015.06.002] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Accepted: 06/10/2015] [Indexed: 01/09/2023]
Abstract
Animal models are used to simulate, under experimental conditions, the complex interactions among host, virus, and environment that affect the person-to-person spread of influenza viruses. The three species that have been most frequently employed, both past and present, as influenza virus transmission models-ferrets, mice, and guinea pigs-have each provided unique insights into the factors governing the efficiency with which these viruses pass from an infected host to a susceptible one. This review will highlight a few of these noteworthy discoveries, with a particular focus on the historical contexts in which each model was developed and the advantages and disadvantages of each species with regard to the study of influenza virus transmission among mammals.
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24
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Takashita E, Meijer A, Lackenby A, Gubareva L, Rebelo-de-Andrade H, Besselaar T, Fry A, Gregory V, Leang SK, Huang W, Lo J, Pereyaslov D, Siqueira MM, Wang D, Mak GC, Zhang W, Daniels RS, Hurt AC, Tashiro M. Global update on the susceptibility of human influenza viruses to neuraminidase inhibitors, 2013–2014. Antiviral Res 2015; 117:27-38. [PMID: 25721488 PMCID: PMC9036627 DOI: 10.1016/j.antiviral.2015.02.003] [Citation(s) in RCA: 118] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Revised: 01/28/2015] [Accepted: 02/06/2015] [Indexed: 12/25/2022]
Abstract
Four World Health Organization (WHO) Collaborating Centres for Reference and Research on Influenza and one WHO Collaborating Centre for the Surveillance, Epidemiology and Control of Influenza (WHO CCs) tested 10,641 viruses collected by WHO-recognized National Influenza Centres between May 2013 and May 2014 to determine 50% inhibitory concentration (IC50) data for neuraminidase inhibitors (NAIs) oseltamivir, zanamivir, peramivir and laninamivir. In addition, neuraminidase (NA) sequence data, available from the WHO CCs and from sequence databases (n = 3206), were screened for amino acid substitutions associated with reduced NAI susceptibility. Ninety-five per cent of the viruses tested by the WHO CCs were from three WHO regions: Western Pacific, the Americas and Europe. Approximately 2% (n = 172) showed highly reduced inhibition (HRI) against at least one of the four NAIs, commonly oseltamivir, while 0.3% (n = 32) showed reduced inhibition (RI). Those showing HRI were A(H1N1)pdm09 with NA H275Y (n = 169), A(H3N2) with NA E119V (n = 1), B/Victoria-lineage with NA E117G (n = 1) and B/Yamagata-lineage with NA H273Y (n = 1); amino acid position numbering is A subtype and B type specific. Although approximately 98% of circulating viruses tested during the 2013–2014 period were sensitive to all four NAIs, a large community cluster of A(H1N1)pdm09 viruses with the NA H275Y substitution from patients with no previous exposure to antivirals was detected in Hokkaido, Japan. Significant numbers of A(H1N1)pdm09 NA H275Y viruses were also detected in China and the United States: phylogenetic analyses showed that the Chinese viruses were similar to those from Japan, while the United States viruses clustered separately from those of the Hokkaido outbreak, indicative of multiple resistance-emergence events. Consequently, global surveillance of influenza antiviral susceptibility should be continued from a public health perspective.
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Affiliation(s)
- Emi Takashita
- World Health Organization Collaborating Centre for Reference and Research on Influenza, National Institute of Infectious Diseases, Gakuen 4-7-1, Musashimurayama, Tokyo 208-0011, Japan.
| | - Adam Meijer
- National Institute for Public Health and the Environment, PO Box 1, 3720 BA Bilthoven, The Netherlands.
| | - Angie Lackenby
- Public Health England Colindale, 61 Colindale Avenue, London NW9 5EQ, United Kingdom.
| | - Larisa Gubareva
- World Health Organization Collaborating Centre for the Surveillance, Epidemiology and Control of Influenza, Centers for Disease Control and Prevention, 1600 Clifton RD NE, MS-G16 Atlanta, GA, United States.
| | - Helena Rebelo-de-Andrade
- Instituto Nacional de Saúde, Av. Padre Cruz, 1649-016 Lisboa, Portugal; Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003 Lisboa, Portugal.
| | - Terry Besselaar
- Global Influenza Programme, World Health Organization, Avenue Appia 20, 1211 Geneva 27, Switzerland.
| | - Alicia Fry
- World Health Organization Collaborating Centre for the Surveillance, Epidemiology and Control of Influenza, Centers for Disease Control and Prevention, 1600 Clifton RD NE, MS-G16 Atlanta, GA, United States.
| | - Vicky Gregory
- World Health Organization Collaborating Centre for Reference and Research on Influenza, MRC-National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, United Kingdom.
| | - Sook-Kwan Leang
- World Health Organization Collaborating Centre for Reference and Research on Influenza, VIDRL, At the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC 3000, Australia.
| | - Weijuan Huang
- World Health Organization Collaborating Centre for Reference and Research on Influenza, Chinese National Influenza Center, National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, 155 Changbai Road, Changping District, Beijing 102206, China.
| | - Janice Lo
- Public Health Laboratory Centre, 382 Nam Cheong Street, Shek Kip Mei, Kowloon, Hong Kong, China.
| | - Dmitriy Pereyaslov
- Division of Communicable Diseases, Health Security, & Environment, World Health Organization Regional Office for Europe, UN City, Marmorvej 51, DK-2100 Copenhagen Ø, Denmark.
| | - Marilda M Siqueira
- Respiratory Viruses Laboratory/IOC, FIOCRUZ, Av Brasil, 4365 Rio de Janeiro, Brazil.
| | - Dayan Wang
- World Health Organization Collaborating Centre for Reference and Research on Influenza, Chinese National Influenza Center, National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, 155 Changbai Road, Changping District, Beijing 102206, China.
| | - Gannon C Mak
- Public Health Laboratory Centre, 382 Nam Cheong Street, Shek Kip Mei, Kowloon, Hong Kong, China.
| | - Wenqing Zhang
- Global Influenza Programme, World Health Organization, Avenue Appia 20, 1211 Geneva 27, Switzerland.
| | - Rod S Daniels
- World Health Organization Collaborating Centre for Reference and Research on Influenza, MRC-National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, United Kingdom.
| | - Aeron C Hurt
- World Health Organization Collaborating Centre for Reference and Research on Influenza, VIDRL, At the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC 3000, Australia; University of Melbourne, Melbourne School of Population and Global Health, Melbourne, VIC 3010, Australia.
| | - Masato Tashiro
- World Health Organization Collaborating Centre for Reference and Research on Influenza, National Institute of Infectious Diseases, Gakuen 4-7-1, Musashimurayama, Tokyo 208-0011, Japan.
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25
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Dayem AA, Choi HY, Kim YB, Cho SG. Antiviral effect of methylated flavonol isorhamnetin against influenza. PLoS One 2015; 10:e0121610. [PMID: 25806943 PMCID: PMC4373826 DOI: 10.1371/journal.pone.0121610] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2014] [Accepted: 02/02/2015] [Indexed: 12/24/2022] Open
Abstract
Influenza is an infectious respiratory disease with frequent seasonal epidemics that causes a high rate of mortality and morbidity in humans, poultry, and animals. Influenza is a serious economic concern due to the costly countermeasures it necessitates. In this study, we compared the antiviral activities of several flavonols and other flavonoids with similar, but distinct, hydroxyl or methyl substitution patterns at the 3, 3′, and 4′ positions of the 15-carbon flavonoid skeleton, and found that the strongest antiviral effect was induced by isorhamnetin. Similar to quercetin and kaempferol, isorhamnetin possesses a hydroxyl group on the C ring, but it has a 3′-methyl group on the B ring that is absent in quercetin and kaempferol. Co-treatment and pre-treatment with isorhamnetin produced a strong antiviral effect against the influenza virus A/PR/08/34(H1N1). However, isorhamnetin showed the most potent antiviral potency when administered after viral exposure (post-treatment method) in vitro. Isorhamnetin treatment reduced virus-induced ROS generation and blocked cytoplasmic lysosome acidification and the lipidation of microtubule associated protein1 light chain 3-B (LC3B). Oral administration of isorhamnetin in mice infected with the influenza A virus significantly decreased lung virus titer by 2 folds, increased the survival rate which ranged from 70–80%, and decreased body weight loss by 25%. In addition, isorhamnetin decreased the virus titer in ovo using embryonated chicken eggs. The structure-activity relationship (SAR) of isorhamnetin could explain its strong anti-influenza virus potency; the methyl group located on the B ring of isorhamnetin may contribute to its strong antiviral potency against influenza virus in comparison with other flavonoids.
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Affiliation(s)
- Ahmed Abdal Dayem
- Department of Animal Biotechnology, Animal Resources Research Center, and Incurable Disease Animal Model and Stem Cell Institute (IDASI), Konkuk University, Gwangjin-Gu, Seoul, Republic of Korea
| | - Hye Yeon Choi
- Department of Animal Biotechnology, Animal Resources Research Center, and Incurable Disease Animal Model and Stem Cell Institute (IDASI), Konkuk University, Gwangjin-Gu, Seoul, Republic of Korea
| | - Young Bong Kim
- Department of Bio-Industrial Technologies, Konkuk University, Gwangjin-Gu, Seoul, Republic of Korea
| | - Ssang-Goo Cho
- Department of Animal Biotechnology, Animal Resources Research Center, and Incurable Disease Animal Model and Stem Cell Institute (IDASI), Konkuk University, Gwangjin-Gu, Seoul, Republic of Korea
- * E-mail:
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26
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Abstract
The ability of an influenza virus to transmit efficiently from human-to-human is a major factor in determining the epidemiological impact of that strain. The use of a relevant animal model to identify viral determinants of transmission, as well as host and environmental factors affecting transmission efficiency, is therefore critical for public health. The characterization of newly emerging influenza viruses in terms of their potential to transmit in a mammalian host is furthermore an important part of pandemic risk assessment. For these reasons, a guinea pig model of influenza virus transmission was developed in 2006. The guinea pig provides an important alternative to preexisting models for influenza. Most influenza viruses do not readily transmit among mice. Ferrets, while highly relevant, are expensive and can be difficult to obtain in high numbers. Moreover, it is generally accepted that efforts to accurately model human disease are strengthened by the use of multiple animal species. Herein, we provide an overview of influenza virus infectivity, growth, and transmission in the guinea pig and highlight knowledge gained on the topic of influenza virus transmission using the guinea pig model.
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Affiliation(s)
- Anice C Lowen
- Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, GA, USA
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27
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Characterization of a large cluster of influenza A(H1N1)pdm09 viruses cross-resistant to oseltamivir and peramivir during the 2013-2014 influenza season in Japan. Antimicrob Agents Chemother 2015; 59:2607-17. [PMID: 25691635 DOI: 10.1128/aac.04836-14] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Accepted: 02/10/2015] [Indexed: 12/17/2022] Open
Abstract
Between September 2013 and July 2014, 2,482 influenza 2009 pandemic A(H1N1) [A(H1N1)pdm09] viruses were screened in Japan for the H275Y substitution in their neuraminidase (NA) protein, which confers cross-resistance to oseltamivir and peramivir. We found that a large cluster of the H275Y mutant virus was present prior to the main influenza season in Sapporo /: Hokkaido, with the detection rate for this mutant virus reaching 29% in this area. Phylogenetic analysis suggested the clonal expansion of a single mutant virus in Sapporo /: Hokkaido. To understand the reason for this large cluster, we examined the in vitro and in vivo properties of the mutant virus. We found that it grew well in cell culture, with growth comparable to that of the wild-type virus. The cluster virus also replicated well in the upper respiratory tract of ferrets and was transmitted efficiently between ferrets by way of respiratory droplets. Almost all recently circulating A(H1N1)pdm09 viruses, including the cluster virus, possessed two substitutions in NA, V241I and N369K, which are known to increase replication and transmission fitness. A structural analysis of NA predicted that a third substitution (N386K) in the NA of the cluster virus destabilized the mutant NA structure in the presence of the V241I and N369K substitutions. Our results suggest that the cluster virus retained viral fitness to spread among humans and, accordingly, caused the large cluster in Sapporo/Hokkaido. However, the mutant NA structure was less stable than that of the wild-type virus. Therefore, once the wild-type virus began to circulate in the community, the mutant virus could not compete and faded out.
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28
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Behera AK, Basu S, Cherian SS. Molecular mechanism of the enhanced viral fitness contributed by secondary mutations in the hemagglutinin protein of oseltamivir resistant H1N1 influenza viruses: modeling studies of antibody and receptor binding. Gene 2014; 557:19-27. [PMID: 25479009 DOI: 10.1016/j.gene.2014.12.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2014] [Revised: 11/26/2014] [Accepted: 12/01/2014] [Indexed: 11/25/2022]
Abstract
The envelope protein hemagglutinin (HA) of influenza viruses is primarily associated with host antibody and receptor interactions. The HA protein is known to maintain a functional balance with neuraminidase (NA), the other major envelope protein. Prior to 2007-2008, human seasonal H1N1 viruses possessing the NA H274Y mutation, which confers oseltamivir resistance, generally had low growth capability. Subsequently, secondary mutations that compensate for the deleterious effect of the NA H274Y mutation have been identified. The molecular mechanism of how the defect could be counteracted by these secondary mutations is not fully understood. We studied here the effect of three such mutations (T86K, K144E and R192K) in the HA protein, which are located at either the HA receptor binding site or in the H1N1 antigenic sites. Molecular docking and dynamics studies showed that, of the three mutations, the R192K mutation could have mediated neutralizing antibody escape and decreased receptor binding affinity, either or both of which may have contributed to increased viral fitness. The study suggests the molecular basis of enhanced viral fitness induced by secondary mutations in the evolution of oseltamivir-resistant influenza strains.
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Affiliation(s)
- Abhisek Kumar Behera
- Bioinformatics Group, National Institute of Virology, 20-A, Dr. Ambedkar Road, Post Box No. 11, Pune 411001, Maharashtra, India.
| | - Sushmita Basu
- Bioinformatics Group, National Institute of Virology, 20-A, Dr. Ambedkar Road, Post Box No. 11, Pune 411001, Maharashtra, India.
| | - Sarah S Cherian
- Bioinformatics Group, National Institute of Virology, 20-A, Dr. Ambedkar Road, Post Box No. 11, Pune 411001, Maharashtra, India.
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29
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Duan S, Govorkova EA, Bahl J, Zaraket H, Baranovich T, Seiler P, Prevost K, Webster RG, Webby RJ. Epistatic interactions between neuraminidase mutations facilitated the emergence of the oseltamivir-resistant H1N1 influenza viruses. Nat Commun 2014; 5:5029. [PMID: 25297528 PMCID: PMC4197134 DOI: 10.1038/ncomms6029] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2014] [Accepted: 08/19/2014] [Indexed: 01/06/2023] Open
Abstract
Oseltamivir-resistant H1N1 influenza viruses carrying the H275Y neuraminidase mutation predominated worldwide during the 2007–2009 seasons. While several neuraminidase substitutions were found to be necessary to counteract the adverse effects of H275Y, the order and impact of evolutionary events involved remain elusive. Here, we reconstruct H1N1 neuraminidase phylogeny during 1999–2009, estimate the timing and order of crucial amino acid changes, and evaluate their impact on the biological outcome of the H275Y mutation. Of the twelve neuraminidase substitutions that occurred during 1999–2009, five (chronologically, V234M, R222Q, K329E, D344N, H275Y, and D354G) are necessary for maintaining full neuraminidase function in the presence of the H275Y mutation by altering protein accumulation or enzyme affinity/activity. The sequential emergence and cumulative effects of these mutations clearly illustrate a role for epistasis in shaping the emergence and subsequent evolution of a drug-resistant virus population, which can be useful in understanding emergence of novel viral phenotypes of influenza.
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Affiliation(s)
- Susu Duan
- Department of Infectious Diseases, St Jude Children's Research Hospital, 262 Danny Thomas Place, Mail Stop 330, Memphis, Tennessee 38105, USA
| | - Elena A Govorkova
- Department of Infectious Diseases, St Jude Children's Research Hospital, 262 Danny Thomas Place, Mail Stop 330, Memphis, Tennessee 38105, USA
| | - Justin Bahl
- 1] School of Public Health, The University of Texas Health Science Center at Houston, 1200 Pressler Street, Houston, Texas 77030, USA [2] Program in Emerging Infectious Diseases, Duke-National University of Singapore Graduate Medical School, 8 College Road, Singapore 169857, Singapore
| | - Hassan Zaraket
- Department of Infectious Diseases, St Jude Children's Research Hospital, 262 Danny Thomas Place, Mail Stop 330, Memphis, Tennessee 38105, USA
| | - Tatiana Baranovich
- Department of Infectious Diseases, St Jude Children's Research Hospital, 262 Danny Thomas Place, Mail Stop 330, Memphis, Tennessee 38105, USA
| | - Patrick Seiler
- Department of Infectious Diseases, St Jude Children's Research Hospital, 262 Danny Thomas Place, Mail Stop 330, Memphis, Tennessee 38105, USA
| | - Kristi Prevost
- Department of Infectious Diseases, St Jude Children's Research Hospital, 262 Danny Thomas Place, Mail Stop 330, Memphis, Tennessee 38105, USA
| | - Robert G Webster
- Department of Infectious Diseases, St Jude Children's Research Hospital, 262 Danny Thomas Place, Mail Stop 330, Memphis, Tennessee 38105, USA
| | - Richard J Webby
- Department of Infectious Diseases, St Jude Children's Research Hospital, 262 Danny Thomas Place, Mail Stop 330, Memphis, Tennessee 38105, USA
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30
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Hai R, Schmolke M, Leyva-Grado VH, Thangavel RR, Margine I, Jaffe EL, Krammer F, Solórzano A, García-Sastre A, Palese P, Bouvier NM. Influenza A(H7N9) virus gains neuraminidase inhibitor resistance without loss of in vivo virulence or transmissibility. Nat Commun 2014; 4:2854. [PMID: 24326875 PMCID: PMC3863970 DOI: 10.1038/ncomms3854] [Citation(s) in RCA: 136] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2013] [Accepted: 11/01/2013] [Indexed: 12/17/2022] Open
Abstract
Without baseline human immunity to the emergent avian influenza A(H7N9) virus, neuraminidase inhibitors are vital for controlling viral replication in severe infections. An amino acid change in the viral neuraminidase associated with drug resistance, NA-R292K (N2 numbering), has been found in some H7N9 clinical isolates. Here we assess the impact of the NA-R292K substitution on antiviral sensitivity and viral replication, pathogenicity and transmissibility of H7N9 viruses. Our data indicate that an H7N9 isolate encoding the NA-R292K substitution is highly resistant to oseltamivir and peramivir and partially resistant to zanamivir. Furthermore, H7N9 reassortants with and without the resistance mutation demonstrate comparable viral replication in primary human respiratory cells, virulence in mice and transmissibility in guinea pigs. Thus, in stark contrast to oseltamivir-resistant seasonal influenza A(H3N2) viruses, H7N9 virus replication and pathogenicity in these models are not substantially altered by the acquisition of high-level oseltamivir resistance due to the NA-R292K mutation. Some clinical isolates of influenza A(H7N9) virus encode a mutation within neuraminidase that could confer resistance to the only class of drugs active against H7N9. Here, the authors show that this mutation does not affect viral replication and pathogenicity while mediating resistance to antivirals in vivo.
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Affiliation(s)
- Rong Hai
- 1] Department of Microbiology, Icahn School of Medicine at Mount Sinai, One Gustave L Levy Place, Box 1124, New York, New York 10029, USA [2]
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31
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He L, Jiang K, Wu Q, Duan Z, Xu H, Liu J, Cui Z, Gu M, Wang X, Liu X, Liu X. Two amino acid substitutions in the haemagglutinin of the 2009 pandemic H1N1 virus decrease direct-contact transmission in guinea pigs. J Gen Virol 2014; 95:2612-2617. [PMID: 25135885 DOI: 10.1099/vir.0.067694-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The 2009 pandemic H1N1 influenza A virus spread across the globe and caused the first influenza pandemic of the 21st century. Many of the molecular factors that contributed to the airborne transmission of this pandemic virus have been determined; however, the direct-contact transmission of this virus remains poorly understood. In this study, we report that a combination of two mutations (N159D and Q226R) in the haemagglutinin (HA) protein of the representative 2009 H1N1 influenza virus A/California/04/2009 (CA04) caused a switch in receptor binding preference from the α2,6-sialoglycan to the α2,3-sialoglycan receptor, and decreased the binding intensities for both glycans. In conjunction with a significantly decreased replication efficiency in the nasal epithelium, this limited human receptor binding affinity resulted in inefficient direct-contact transmission of CA04 between guinea pigs. Our findings highlight the role of the HA gene in the transmission of the influenza virus.
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Affiliation(s)
- Liang He
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, PR China
| | - Kaijun Jiang
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, PR China
| | - Qiwen Wu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, PR China
| | - Zhiqiang Duan
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, PR China
| | - Haixu Xu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, PR China
| | - Jingjing Liu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, PR China
| | - Zhu Cui
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, PR China
| | - Min Gu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, PR China
| | - Xiaoquan Wang
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, PR China
| | - Xiaowen Liu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, PR China
| | - Xiufan Liu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, PR China
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32
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Thangavel RR, Bouvier NM. Animal models for influenza virus pathogenesis, transmission, and immunology. J Immunol Methods 2014; 410:60-79. [PMID: 24709389 PMCID: PMC4163064 DOI: 10.1016/j.jim.2014.03.023] [Citation(s) in RCA: 129] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 03/22/2014] [Accepted: 03/24/2014] [Indexed: 12/24/2022]
Abstract
In humans, infection with an influenza A or B virus manifests typically as an acute and self-limited upper respiratory tract illness characterized by fever, cough, sore throat, and malaise. However, influenza can present along a broad spectrum of disease, ranging from sub-clinical or even asymptomatic infection to a severe primary viral pneumonia requiring advanced medical supportive care. Disease severity depends upon the virulence of the influenza virus strain and the immune competence and previous influenza exposures of the patient. Animal models are used in influenza research not only to elucidate the viral and host factors that affect influenza disease outcomes in and spread among susceptible hosts, but also to evaluate interventions designed to prevent or reduce influenza morbidity and mortality in man. This review will focus on the three animal models currently used most frequently in influenza virus research - mice, ferrets, and guinea pigs - and discuss the advantages and disadvantages of each.
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Affiliation(s)
- Rajagowthamee R Thangavel
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY 10029, USA
| | - Nicole M Bouvier
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY 10029, USA; Division of Infectious Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY 10029, USA.
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33
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Butler J, Hooper KA, Petrie S, Lee R, Maurer-Stroh S, Reh L, Guarnaccia T, Baas C, Xue L, Vitesnik S, Leang SK, McVernon J, Kelso A, Barr IG, McCaw JM, Bloom JD, Hurt AC. Estimating the fitness advantage conferred by permissive neuraminidase mutations in recent oseltamivir-resistant A(H1N1)pdm09 influenza viruses. PLoS Pathog 2014; 10:e1004065. [PMID: 24699865 PMCID: PMC3974874 DOI: 10.1371/journal.ppat.1004065] [Citation(s) in RCA: 100] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Accepted: 02/27/2014] [Indexed: 01/06/2023] Open
Abstract
Oseltamivir is relied upon worldwide as the drug of choice for the treatment of human influenza infection. Surveillance for oseltamivir resistance is routinely performed to ensure the ongoing efficacy of oseltamivir against circulating viruses. Since the emergence of the pandemic 2009 A(H1N1) influenza virus (A(H1N1)pdm09), the proportion of A(H1N1)pdm09 viruses that are oseltamivir resistant (OR) has generally been low. However, a cluster of OR A(H1N1)pdm09 viruses, encoding the neuraminidase (NA) H275Y oseltamivir resistance mutation, was detected in Australia in 2011 amongst community patients that had not been treated with oseltamivir. Here we combine a competitive mixtures ferret model of influenza infection with a mathematical model to assess the fitness, both within and between hosts, of recent OR A(H1N1)pdm09 viruses. In conjunction with data from in vitro analyses of NA expression and activity we demonstrate that contemporary A(H1N1)pdm09 viruses are now more capable of acquiring H275Y without compromising their fitness, than earlier A(H1N1)pdm09 viruses circulating in 2009. Furthermore, using reverse engineered viruses we demonstrate that a pair of permissive secondary NA mutations, V241I and N369K, confers robust fitness on recent H275Y A(H1N1)pdm09 viruses, which correlated with enhanced surface expression and enzymatic activity of the A(H1N1)pdm09 NA protein. These permissive mutations first emerged in 2010 and are now present in almost all circulating A(H1N1)pdm09 viruses. Our findings suggest that recent A(H1N1)pdm09 viruses are now more permissive to the acquisition of H275Y than earlier A(H1N1)pdm09 viruses, increasing the risk that OR A(H1N1)pdm09 will emerge and spread worldwide.
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Affiliation(s)
- Jeff Butler
- World Health Organization Collaborating Centre for Reference and Research on Influenza, North Melbourne, Australia
| | - Kathryn A. Hooper
- Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
- Molecular and Cellular Biology Program, University of Washington, Seattle, Washington, United States of America
| | - Stephen Petrie
- Melbourne School of Population and Global Health, The University of Melbourne, Parkville, Australia
| | - Raphael Lee
- Bioinformatics Institute (BII), Agency for Science, Technology and Research (A*STAR), Singapore
| | - Sebastian Maurer-Stroh
- Bioinformatics Institute (BII), Agency for Science, Technology and Research (A*STAR), Singapore
- National Public Health Laboratory, Communicable Diseases Division Ministry of Health, Singapore
- School of Biological Sciences (SBS), Nanyang Technological University (NTU), Singapore
| | - Lucia Reh
- World Health Organization Collaborating Centre for Reference and Research on Influenza, North Melbourne, Australia
| | - Teagan Guarnaccia
- World Health Organization Collaborating Centre for Reference and Research on Influenza, North Melbourne, Australia
| | - Chantal Baas
- World Health Organization Collaborating Centre for Reference and Research on Influenza, North Melbourne, Australia
- Monash University, School of Applied Sciences, Churchill, Victoria, Australia
| | - Lumin Xue
- World Health Organization Collaborating Centre for Reference and Research on Influenza, North Melbourne, Australia
| | - Sophie Vitesnik
- World Health Organization Collaborating Centre for Reference and Research on Influenza, North Melbourne, Australia
| | - Sook-Kwan Leang
- World Health Organization Collaborating Centre for Reference and Research on Influenza, North Melbourne, Australia
| | - Jodie McVernon
- Melbourne School of Population and Global Health, The University of Melbourne, Parkville, Australia
- Murdoch Childrens Research Institute, The Royal Children's Hospital, Melbourne, Victoria, Australia
| | - Anne Kelso
- World Health Organization Collaborating Centre for Reference and Research on Influenza, North Melbourne, Australia
| | - Ian G. Barr
- World Health Organization Collaborating Centre for Reference and Research on Influenza, North Melbourne, Australia
- Monash University, School of Applied Sciences, Churchill, Victoria, Australia
| | - James M. McCaw
- Melbourne School of Population and Global Health, The University of Melbourne, Parkville, Australia
- Murdoch Childrens Research Institute, The Royal Children's Hospital, Melbourne, Victoria, Australia
| | - Jesse D. Bloom
- Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
| | - Aeron C. Hurt
- World Health Organization Collaborating Centre for Reference and Research on Influenza, North Melbourne, Australia
- Monash University, School of Applied Sciences, Churchill, Victoria, Australia
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34
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Foll M, Poh YP, Renzette N, Ferrer-Admetlla A, Bank C, Shim H, Malaspinas AS, Ewing G, Liu P, Wegmann D, Caffrey DR, Zeldovich KB, Bolon DN, Wang JP, Kowalik TF, Schiffer CA, Finberg RW, Jensen JD. Influenza virus drug resistance: a time-sampled population genetics perspective. PLoS Genet 2014; 10:e1004185. [PMID: 24586206 PMCID: PMC3937227 DOI: 10.1371/journal.pgen.1004185] [Citation(s) in RCA: 110] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Accepted: 01/06/2014] [Indexed: 01/01/2023] Open
Abstract
The challenge of distinguishing genetic drift from selection remains a central focus of population genetics. Time-sampled data may provide a powerful tool for distinguishing these processes, and we here propose approximate Bayesian, maximum likelihood, and analytical methods for the inference of demography and selection from time course data. Utilizing these novel statistical and computational tools, we evaluate whole-genome datasets of an influenza A H1N1 strain in the presence and absence of oseltamivir (an inhibitor of neuraminidase) collected at thirteen time points. Results reveal a striking consistency amongst the three estimation procedures developed, showing strongly increased selection pressure in the presence of drug treatment. Importantly, these approaches re-identify the known oseltamivir resistance site, successfully validating the approaches used. Enticingly, a number of previously unknown variants have also been identified as being positively selected. Results are interpreted in the light of Fisher's Geometric Model, allowing for a quantification of the increased distance to optimum exerted by the presence of drug, and theoretical predictions regarding the distribution of beneficial fitness effects of contending mutations are empirically tested. Further, given the fit to expectations of the Geometric Model, results suggest the ability to predict certain aspects of viral evolution in response to changing host environments and novel selective pressures.
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Affiliation(s)
- Matthieu Foll
- School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
- Swiss Institute of Bioinformatics (SIB), Lausanne, Switzerland
| | - Yu-Ping Poh
- Swiss Institute of Bioinformatics (SIB), Lausanne, Switzerland
- Program in Bioinformatics and Integrative Biology, University of Massachusetts Medical School, Worcester, Massachusetts, United States of America
| | - Nicholas Renzette
- Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, Massachusetts, United States of America
| | - Anna Ferrer-Admetlla
- School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
- Swiss Institute of Bioinformatics (SIB), Lausanne, Switzerland
- Department of Biology and Biochemistry, University of Fribourg, Fribourg, Switzerland
| | - Claudia Bank
- School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
- Swiss Institute of Bioinformatics (SIB), Lausanne, Switzerland
| | - Hyunjin Shim
- School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
- Swiss Institute of Bioinformatics (SIB), Lausanne, Switzerland
| | - Anna-Sapfo Malaspinas
- Center for GeoGenetics, Natural History Museum of Denmark, University of Copenhagen, Copenhagen, Denmark
| | - Gregory Ewing
- School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
- Swiss Institute of Bioinformatics (SIB), Lausanne, Switzerland
| | - Ping Liu
- Department of Medicine, University of Massachusetts Medical School, Worcester, Massachusetts, United States of America
| | - Daniel Wegmann
- Swiss Institute of Bioinformatics (SIB), Lausanne, Switzerland
- Department of Biology and Biochemistry, University of Fribourg, Fribourg, Switzerland
| | - Daniel R. Caffrey
- Department of Medicine, University of Massachusetts Medical School, Worcester, Massachusetts, United States of America
| | - Konstantin B. Zeldovich
- Program in Bioinformatics and Integrative Biology, University of Massachusetts Medical School, Worcester, Massachusetts, United States of America
| | - Daniel N. Bolon
- Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts, United States of America
| | - Jennifer P. Wang
- Department of Medicine, University of Massachusetts Medical School, Worcester, Massachusetts, United States of America
| | - Timothy F. Kowalik
- Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, Massachusetts, United States of America
| | - Celia A. Schiffer
- Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts, United States of America
| | - Robert W. Finberg
- Department of Medicine, University of Massachusetts Medical School, Worcester, Massachusetts, United States of America
| | - Jeffrey D. Jensen
- School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
- Swiss Institute of Bioinformatics (SIB), Lausanne, Switzerland
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35
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Impact of potential permissive neuraminidase mutations on viral fitness of the H275Y oseltamivir-resistant influenza A(H1N1)pdm09 virus in vitro, in mice and in ferrets. J Virol 2013; 88:1652-8. [PMID: 24257597 DOI: 10.1128/jvi.02681-13] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Neuraminidase (NA) mutations conferring resistance to NA inhibitors (NAIs) generally compromise the fitness of influenza viruses. The only NAI-resistant virus that widely spread in the population, the A/Brisbane/59/2007 (H1N1) strain, contained permissive mutations that restored the detrimental effect caused by the H275Y change. Computational analysis predicted other permissive NA mutations for A(H1N1)pdm09 viruses. Here, we investigated the effect of T289M and N369K mutations on the viral fitness of the A(H1N1)pdm09 H275Y variant. Recombinant wild-type (WT) A(H1N1)pdm09 and the H275Y, H275Y/T289M, H275Y/N369K, and H275Y/V241I/N369K (a natural variant) NA mutants were generated by reverse genetics. Replication kinetics were performed by using ST6GalI-MDCK cells. Virulence was assessed in C57BL/6 mice, and contact transmission was evaluated in ferrets. The H275Y mutation significantly reduced viral titers during the first 12 to 36 h postinfection (p.i.) in vitro. Nevertheless, the WT and H275Y viruses induced comparable mortality rates, weight loss, and lung titers in mice. The T289M mutation eliminated the detrimental effect caused by the H275Y change in vitro while causing greater weight loss and mortality in mice, with significantly higher lung viral titers on days 3 and 6 p.i. than with the H275Y mutant. In index ferrets, the WT, H275Y, H275Y/T289M, and H275Y/V241I/N369K recombinants induced comparable fever, weight loss, and nasal wash viral titers. All tested viruses were transmitted at comparable rates in contact ferrets, with the H275Y/V241I/N369K recombinant demonstrating higher nasal wash viral titers than the H275Y mutant. Permissive mutations may enhance the fitness of A(H1N1)pdm09 H275Y viruses in vitro and in vivo. The emergence of such variants should be carefully monitored.
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Abstract
The threat of a virulent, highly transmissible pandemic virus has motivated an escalating research effort to identify the transmissible genotypes of animal viruses that cross over into the human population (animal–human transmission) and sustain human–human transmission. In addition to the pursuit of the viral genotype, a greater understanding of the host-virus phenotype of infectiousness, transmissibility and susceptibility will be required. This review examines experimental animal transmission of influenza for insights into human influenza transmission. Transmission is viewed as sequential steps that the virus must pass critical thresholds to achieve transmission and ultimately survival in the human host. In particular, a quantitative understanding in animal models of viral replication efficiency, airway viral load, exhaled viral aerosol load, environmental virus survival and host susceptibility will likely yield important insights. Computational modeling will enhance animal model data, as well as guide the use of pandemic mitigation strategies.
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Affiliation(s)
- Frederick Koster
- Department of Computer Science, University of New Mexico, Albuquerque, NM, USA and The Lovelace Respiratory Research Institute, Albuquerque, NM, USA
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37
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The short stalk length of highly pathogenic avian influenza H5N1 virus neuraminidase limits transmission of pandemic H1N1 virus in ferrets. J Virol 2013; 87:10539-51. [PMID: 23864615 DOI: 10.1128/jvi.00967-13] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
H5N1 influenza viruses pose a pandemic threat but have not acquired the ability to support sustained transmission between mammals in nature. The restrictions to transmissibility of avian influenza viruses in mammals are multigenic, and overcoming them requires adaptations in hemagglutinin (HA) and PB2 genes. Here we propose that a further restriction to mammalian transmission of the majority of highly pathogenic avian influenza (HPAI) H5N1 viruses may be the short stalk length of the neuraminidase (NA) protein. This genetic feature is selected for when influenza viruses adapt to chickens. In our study, a recombinant virus with seven gene segments from a human isolate of the 2009 H1N1 pandemic combined with the NA gene from a typical chicken-adapted H5N1 virus with a short stalk did not support transmission by respiratory droplet between ferrets. This virus was also compromised in multicycle replication in cultures of human airway epithelial cells at 32°C. These defects correlated with a reduction in the ability of virus with a short-stalk NA to penetrate mucus and deaggregate virions. The deficiency in transmission and in cleavage of tethered substrates was overcome by increasing the stalk length of the NA protein. These observations suggest that H5N1 viruses that acquire a long-stalk NA through reassortment might be more likely to support transmission between humans. Phylogenetic analysis showed that reassortment with long-stalk NA occurred sporadically and as recently as 2011. However, all identified H5N1 viruses with a long-stalk NA lacked other mammalian adapting features and were thus several genetic steps away from becoming transmissible between humans.
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38
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Recombinant IgA is sufficient to prevent influenza virus transmission in guinea pigs. J Virol 2013; 87:7793-804. [PMID: 23698296 DOI: 10.1128/jvi.00979-13] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A serum hemagglutination inhibition (HAI) titer of 40 or greater is thought to be associated with reduced influenza virus pathogenesis in humans and is often used as a correlate of protection in influenza vaccine studies. We have previously demonstrated that intramuscular vaccination of guinea pigs with inactivated influenza virus generates HAI titers greater than 300 but does not protect vaccinated animals from becoming infected with influenza virus by transmission from an infected cage mate. Only guinea pigs intranasally inoculated with a live influenza virus or a live attenuated virus vaccine, prior to challenge, were protected from transmission (A. C. Lowen et al., J. Virol. 83:2803-2818, 2009.). Because the serum HAI titer is mostly determined by IgG content, these results led us to speculate that prevention of viral transmission may require IgA antibodies or cellular immune responses. To evaluate this hypothesis, guinea pigs and ferrets were administered a potent, neutralizing mouse IgG monoclonal antibody, 30D1 (Ms 30D1 IgG), against the A/California/04/2009 (H1N1) virus hemagglutinin and exposed to respiratory droplets from animals infected with this virus. Even though HAI titers were greater than 160 1 day postadministration, Ms 30D1 IgG did not prevent airborne transmission to passively immunized recipient animals. In contrast, intramuscular administration of recombinant 30D1 IgA (Ms 30D1 IgA) prevented transmission to 88% of recipient guinea pigs, and Ms 30D1 IgA was detected in animal nasal washes. Ms 30D1 IgG administered intranasally also prevented transmission, suggesting the importance of mucosal immunity in preventing influenza virus transmission. Collectively, our data indicate that IgG antibodies may prevent pathogenesis associated with influenza virus infection but do not protect from virus infection by airborne transmission, while IgA antibodies are more important for preventing transmission of influenza viruses.
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39
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Shaw AE, Ratinier M, Nunes SF, Nomikou K, Caporale M, Golder M, Allan K, Hamers C, Hudelet P, Zientara S, Breard E, Mertens P, Palmarini M. Reassortment between two serologically unrelated bluetongue virus strains is flexible and can involve any genome segment. J Virol 2013; 87:543-57. [PMID: 23097432 PMCID: PMC3536370 DOI: 10.1128/jvi.02266-12] [Citation(s) in RCA: 90] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2012] [Accepted: 10/16/2012] [Indexed: 11/20/2022] Open
Abstract
Coinfection of a cell by two different strains of a segmented virus can give rise to a "reassortant" with phenotypic characteristics that might differ from those of the parental strains. Bluetongue virus (BTV) is a double-stranded RNA (dsRNA) segmented virus and the cause of bluetongue, a major infectious disease of livestock. BTV exists as at least 26 different serotypes (BTV-1 to BTV-26). Prompted by the isolation of a field reassortant between BTV-1 and BTV-8, we systematically characterized the process of BTV reassortment. Using a reverse genetics approach, our study clearly indicates that any BTV-1 or BTV-8 genome segment can be rescued in the heterologous "backbone." To assess phenotypic variation as a result of reassortment, we examined viral growth kinetics and plaque sizes in in vitro experiments and virulence in an experimental mouse model of bluetongue disease. The monoreassortants generated had phenotypes that were very similar to those of the parental wild-type strains both in vitro and in vivo. Using a forward genetics approach in cells coinfected with BTV-1 and BTV-8, we have shown that reassortants between BTV-1 and BTV-8 are generated very readily. After only four passages in cell culture, we could not detect wild-type BTV-1 or BTV-8 in any of 140 isolated viral plaques. In addition, most of the isolated reassortants contained heterologous VP2 and VP5 structural proteins, while only 17% had homologous VP2 and VP5 proteins. Our study has shown that reassortment in BTV is very flexible, and there is no fundamental barrier to the reassortment of any genome segment. Given the propensity of BTV to reassort, it is increasingly important to have an alternative classification system for orbiviruses.
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Affiliation(s)
- Andrew E. Shaw
- MRC–University of Glasgow Centre for Virus Research, Institute of Infection, Immunity and Inflammation, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, United Kingdom
| | - Maxime Ratinier
- MRC–University of Glasgow Centre for Virus Research, Institute of Infection, Immunity and Inflammation, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, United Kingdom
| | - Sandro Filipe Nunes
- MRC–University of Glasgow Centre for Virus Research, Institute of Infection, Immunity and Inflammation, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, United Kingdom
| | | | - Marco Caporale
- MRC–University of Glasgow Centre for Virus Research, Institute of Infection, Immunity and Inflammation, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, United Kingdom
- Istituto G. Caporale, Teramo, Italy
| | - Matthew Golder
- MRC–University of Glasgow Centre for Virus Research, Institute of Infection, Immunity and Inflammation, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, United Kingdom
| | - Kathryn Allan
- MRC–University of Glasgow Centre for Virus Research, Institute of Infection, Immunity and Inflammation, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, United Kingdom
| | | | | | - Stéphan Zientara
- French Agency for Food, Environment and Occupational Health and Safety (ANSES), Maisons-Alfort, France
| | - Emmanuel Breard
- French Agency for Food, Environment and Occupational Health and Safety (ANSES), Maisons-Alfort, France
| | | | - Massimo Palmarini
- MRC–University of Glasgow Centre for Virus Research, Institute of Infection, Immunity and Inflammation, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, United Kingdom
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The H275Y neuraminidase mutation of the pandemic A/H1N1 influenza virus lengthens the eclipse phase and reduces viral output of infected cells, potentially compromising fitness in ferrets. J Virol 2012; 86:10651-60. [PMID: 22837199 DOI: 10.1128/jvi.07244-11] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The H275Y amino acid substitution of the neuraminidase gene is the most common mutation conferring oseltamivir resistance in the N1 subtype of the influenza virus. Using a mathematical model to analyze a set of in vitro experiments that allow for the full characterization of the viral replication cycle, we show that the primary effects of the H275Y substitution on the pandemic H1N1 (H1N1pdm09) strain are to lengthen the mean eclipse phase of infected cells (from 6.6 to 9.1 h) and decrease (by 7-fold) the viral burst size, i.e., the total number of virions produced per cell. We also find, however, that the infectious-unit-to-particle ratio of the H275Y mutant strain is 12-fold higher than that of the oseltamivir-susceptible strain (0.19 versus 0.016 per RNA copy). A parallel analysis of the H275Y mutation in the prior seasonal A/Brisbane/59/2007 background shows similar changes in the infection kinetic parameters, but in this background, the H275Y mutation also allows the mutant to infect cells five times more rapidly. Competitive mixed-strain infections in vitro, where the susceptible and resistant H1N1pdm09 strains must compete for cells, are characterized by higher viral production by the susceptible strain but suggest equivalent fractions of infected cells in the culture. In ferrets, however, the mutant strain appears to suffer a delay in its infection of the respiratory tract that allows the susceptible strain to dominate mixed-strain infections.
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41
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Lipsitch M, Plotkin JB, Simonsen L, Bloom B. Evolution, safety, and highly pathogenic influenza viruses. Science 2012; 336:1529-31. [PMID: 22723411 PMCID: PMC3467308 DOI: 10.1126/science.1223204] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Experience with influenza has shown that predictions of virus phenotype or fitness from nucleotide sequence are imperfect and that predicting the timing and course of evolution is extremely difficult. Such uncertainty means that the risk of experiments with mammalian-transmissible, possibly highly virulent influenza viruses remains high even if some aspects of their laboratory biology are reassuring; it also implies limitations on the ability of laboratory observations to guide interpretation of surveillance of strains in the field. Thus, we propose that future experiments with virulent pathogens whose accidental or deliberate release could lead to extensive spread in human populations should be limited by explicit risk-benefit considerations.
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Affiliation(s)
- Marc Lipsitch
- Department of Epidemiology and Department of Immunology and Infectious Diseases, Harvard School of Public Health, Boston, MA 02115 USA
| | - Joshua B. Plotkin
- Department of Biology, University of Pennsylvania, Philadelphia, PA 19104 USA
| | - Lone Simonsen
- Department of Global Health, George Washington University School of Public Health and Health Services, Washington, DC 20037 USA
| | - Barry Bloom
- Department of Immunology and Infectious Diseases, Harvard School of Public Health, Boston, MA 02115 USA
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