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influenza virus

  • Influenza Virus Neuraminidase Engages CD83 and Promotes Pulmonary Injury
    Pathogenesis and Immunity
    Influenza Virus Neuraminidase Engages CD83 and Promotes Pulmonary Injury

    The massive release of circulating mediators of inflammation is responsible for lung injury during influenza A virus infection. This phenomenon is referred to as the “cytokine storm.” However, the mechanism by which influenza induces the cytokine storm is not fully understood.

    Ning Ma, Xingjie Li, Hongyu Jiang, Yulong Dai, Guofeng Xu, Zongde Zhang
  • A Novel Mechanism Underlying Antiviral Activity of an Influenza Virus M2-Specific Antibody
    Vaccines and Antiviral Agents
    A Novel Mechanism Underlying Antiviral Activity of an Influenza Virus M2-Specific Antibody

    Although the IAV HA is the major target of neutralizing antibodies, most of the antibodies are HA subtype specific, restricting the potential of HA-based vaccines. On the contrary, the IAV M2 protein has been studied as a vaccine antigen to confer cross-protective immunity against IAVs with multiple HA subtypes, since M2 is antigenically conserved. Although a number of studies highlight the protective role of anti-HA neutralizing and...

    Rashid Manzoor, Nao Eguchi, Reiko Yoshida, Hiroichi Ozaki, Tatsunari Kondoh, Kosuke Okuya, Hiroko Miyamoto, Ayato Takada
  • Open Access
    PA Mutations Inherited during Viral Evolution Act Cooperatively To Increase Replication of Contemporary H5N1 Influenza Virus with an Expanded Host Range
    Pathogenesis and Immunity
    PA Mutations Inherited during Viral Evolution Act Cooperatively To Increase Replication of Contemporary H5N1 Influenza Virus with an Expanded Host Range

    Clade 2.2.1 avian influenza viruses (H5N1) are unique to Egypt and have caused the highest number of human H5N1 influenza cases worldwide, presenting a serious global public health threat. These viruses may have the greatest evolutionary potential for adaptation from avian hosts to human hosts. Using a comprehensive phylogenetic approach, we identified several novel clade 2.2.1 virus polymerase mutations that increased viral replication...

    Yasuha Arai, Norihito Kawashita, Emad Mohamed Elgendy, Madiha Salah Ibrahim, Tomo Daidoji, Takao Ono, Tatsuya Takagi, Takaaki Nakaya, Kazuhiko Matsumoto, Yohei Watanabe
  • Open Access
    Loss of the Nuclear Protein RTF2 Enhances Influenza Virus Replication
    Cellular Response to Infection | Spotlight
    Loss of the Nuclear Protein RTF2 Enhances Influenza Virus Replication

    Viral infection triggers the secretion of type I interferons, which in turn induce the expression of hundreds of antiviral genes. However, the roles of these induced genes in controlling viral infections remain largely unknown, limiting our ability to develop host-based antiviral therapeutics against pathogenic viruses, such as influenza virus. Here, we performed a loss-of-function genetic CRISPR screen in cells prestimulated with type...

    Bing Shao Chia, Bo Li, Ang Cui, Thomas Eisenhaure, Raktima Raychowdhury, David Lieb, Nir Hacohen
  • L226Q Mutation on Influenza H7N9 Virus Hemagglutinin Increases Receptor-Binding Avidity and Leads to Biased Antigenicity Evaluation
    Vaccines and Antiviral Agents
    L226Q Mutation on Influenza H7N9 Virus Hemagglutinin Increases Receptor-Binding Avidity and Leads to Biased Antigenicity Evaluation

    The HI assay is a standard method for profiling the antigenic characterization of influenza viruses. Suspected antigenic changes based on HI divergency in H7N9 viruses during the 2016-2017 wave prompted the recommendation of new H7N9 candidate vaccine viruses (CVVs). In this study, we found that the L226Q substitution in HA of A/Guangdong/17SF003/2016 (H7/GD16) increased the viral receptor-binding avidity to red blood cells with no...

    Yang Wang, Yunhua Lv, Xuefeng Niu, Ji Dong, Pei Feng, Qinming Li, Wei Xu, Jiashun Li, Chufang Li, Jiahui Li, Jia Luo, Zhixia Li, Yichu Liu, Yee-Joo Tan, Weiqi Pan, Ling Chen
  • Phenotypic Effects of Substitutions within the Receptor Binding Site of Highly Pathogenic Avian Influenza H5N1 Virus Observed during Human Infection
    Pathogenesis and Immunity
    Phenotypic Effects of Substitutions within the Receptor Binding Site of Highly Pathogenic Avian Influenza H5N1 Virus Observed during Human Infection

    H5 viruses continue to be a threat for public health. Because these viruses are immunologically novel to humans, they could spark a pandemic when adapted to transmit between humans. Avian influenza viruses need several adaptive mutations to bind to human-type receptors, increase hemagglutinin (HA) stability, and replicate in human cells. However, knowledge on adaptive mutations during human infections is limited. A previous study showed...

    Dirk Eggink, Monique Spronken, Roosmarijn van der Woude, Jocynthe Buzink, Frederik Broszeit, Ryan McBride, Hana A. Pawestri, Vivi Setiawaty, James C. Paulson, Geert-Jan Boons, Ron A. M. Fouchier, Colin A. Russell, Menno D. de Jong, Robert P. de Vries
  • Murine Cross-Reactive Nonneutralizing Polyclonal IgG1 Antibodies Induced by Influenza Vaccine Inhibit the Cross-Protective Effect of IgG2 against Heterologous Virus in Mice
    Vaccines and Antiviral Agents
    Murine Cross-Reactive Nonneutralizing Polyclonal IgG1 Antibodies Induced by Influenza Vaccine Inhibit the Cross-Protective Effect of IgG2 against Heterologous Virus in Mice

    Current influenza vaccines are generally effective against highly similar virus strains by inducing neutralizing antibodies. However, these antibodies fail to neutralize antigenically mismatched (heterologous) strains and therefore provide limited protection against them. Efforts are being made to develop vaccines with cross-protective ability that would protect broadly against heterologous strains, because the mismatch between...

    Meito Shibuya, Taiki Aoshi, Etsushi Kuroda, Yasuo Yoshioka
  • An R195K Mutation in the PA-X Protein Increases the Virulence and Transmission of Influenza A Virus in Mammalian Hosts
    Pathogenesis and Immunity
    An R195K Mutation in the PA-X Protein Increases the Virulence and Transmission of Influenza A Virus in Mammalian Hosts

    Four influenza pandemics in humans (the Spanish flu of 1918 [H1N1], the Asian flu of 1957 [H2N2], the Hong Kong flu of 1968 [H3N2], and the swine origin flu of 2009 [H1N1]) are all proposed to have been caused by avian or swine influenza viruses that acquired virulence factors through adaptive mutation or reassortment with circulating human viruses. Currently, influenza viruses circulating in animals are repeatedly transmitted to humans...

    Yipeng Sun, Zhe Hu, Xuxiao Zhang, Mingyue Chen, Zhen Wang, Guanlong Xu, Yuhai Bi, Qi Tong, Mingyang Wang, Honglei Sun, Juan Pu, Munir Iqbal, Jinhua Liu
  • Outbreak Severity of Highly Pathogenic Avian Influenza A(H5N8) Viruses Is Inversely Correlated to Polymerase Complex Activity and Interferon Induction
    Pathogenesis and Immunity
    Outbreak Severity of Highly Pathogenic Avian Influenza A(H5N8) Viruses Is Inversely Correlated to Polymerase Complex Activity and Interferon Induction

    Compared to the 2014-15 outbreak, the 2016-17 outbreak of influenza A(H5N8) viruses in the Netherlands and Europe was more virulent; the number of dead or diseased wild birds found and the severity of pathological changes were higher during the 2016-17 outbreak. The polymerase complex plays an important role in influenza virus virulence, and the gene segments of influenza A(H5N8) viruses reassorted extensively between the outbreaks. In...

    René M. Vigeveno, Marjolein J. Poen, Edyth Parker, Melle Holwerda, Karen de Haan, Thijs van Montfort, Nicola S. Lewis, Colin A. Russell, Ron A. M. Fouchier, Menno D. de Jong, Dirk Eggink
  • Open Access
    Suppression of Cytotoxic T Cell Functions and Decreased Levels of Tissue-Resident Memory T Cells during H5N1 Infection
    Cellular Response to Infection
    Suppression of Cytotoxic T Cell Functions and Decreased Levels of Tissue-Resident Memory T Cells during H5N1 Infection

    Influenza viruses cause upper respiratory tract infections in humans. In healthy adults, seasonal influenza virus infections result in mild disease. Occasionally, influenza viruses endemic in domestic birds can cause severe and fatal disease even in healthy individuals. In avian influenza virus-infected patients, the host immune system is activated in an uncontrolled manner and is unable to control infection in a timely fashion. In this...

    Matheswaran Kandasamy, Kevin Furlong, Jasmine T. Perez, Santhakumar Manicassamy, Balaji Manicassamy

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