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Replication Restriction of Influenza A(H5N1) Clade 2.3.4.4b Viruses by Human Immune Factor, 2023-2024

Jakob Ankerhold, Susanne Kessler, Martin Beer

    Emerging Infectious Diseases
    |December 10, 2024
    PubMed

    Insights

    Human myxovirus resistance protein 1 (MxA) inhibits avian influenza A(H5N1) virus replication. However, H5N1 can evade MxA restriction by acquiring specific viral components from resistant strains.

    Area of Science:

    • Virology
    • Immunology
    • Molecular Biology

    Background:

    • Highly pathogenic avian influenza A(H5N1) viruses pose a significant threat to public health.
    • Human myxovirus resistance protein 1 (MxA) is a key innate immune factor known to restrict viral replication.

    Purpose of the Study:

    • To investigate the antiviral activity of human MxA against avian influenza A(H5N1) viruses.
    • To elucidate the mechanisms by which H5N1 viruses may evade MxA-mediated restriction.

    Main Methods:

    • In vitro replication assays using H5N1 isolates and MxA-expressing cells.
    • In vivo studies utilizing MxA-transgenic mouse models.
    • Analysis of viral polymerase complex component exchange.

    Main Results:

    • Human MxA demonstrably suppressed the replication of H5N1 viruses in both cell culture and transgenic mice.
    • H5N1 viruses exhibited the ability to evade MxA restriction.
    • Evading MxA involved the acquisition of specific viral polymerase components from a human-adapted, MxA-resistant strain.

    Conclusions:

    • Human MxA is an effective antiviral factor against H5N1 influenza A viruses.
    • Avian influenza A(H5N1) viruses possess mechanisms to overcome MxA-mediated innate immunity.
    • Understanding viral evasion strategies is crucial for developing effective antiviral therapies against influenza.
    Keywords:
    H5N1 clade 2.3.4.4bMxAhighly pathogenic avian influenza A(H5N1) virusesinfluenzarisk assessmentvirusviruseszoonoseszoonotic transmission

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