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Agathisflavone, a biflavonoid from Anacardium occidentale L., inhibits influenza virus' neuraminidase

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  • Agathisflavone, a biflavonoid from Anacardium occidentale L., inhibits influenza virus' neuraminidase


    Curr Top Med Chem. 2019 Dec 19. doi: 10.2174/1568026620666191219150738. [Epub ahead of print] Agathisflavone, a biflavonoid from Anacardium occidentale L., inhibits influenza virus' neuraminidase.

    de Freitas CS1, Rocha MEN1, Sacramento CQ1, Marttorelli A1, Ferreira AC1, Rocha N1, de Oliveira AC2, de Oliveira Gomes AM2, Dos Santos PS1, da Silva EO2, da Costa JP2, de Lima Moreira D3, Bozza PT2, da Silva JL2, Barroso SPC2, Souza TML1.
    Author information

    1 Laborat?rio de Imunofarmacologia, Instituto Oswaldo Cruz (IOC), Funda??o Oswaldo Cruz (Fiocruz), Rio de Janeiro, RJ. Brazil. 2 Instituto Nacional de Ci?ncia e Tecnologia de Biologia Estrutural e Bioimagem. Brazil. 3 Laborat?rio de Qu?mica de Produtos Naturais 5, Farmanguinhos, Fiocruz, Rio de Janeiro, Rio de Janeiro. Brazil.

    Abstract

    BACKGROUND:

    Neuraminidase inhibitors (NAIs) are the only class of antivirals in clinical use against influenza virus approved worldwide. However, approximately 1-3% of circulating strains present resistance mutations to oseltamivir (OST), the most used NAI. Therefore, it is important to catalogue new molecules to inhibit influenza virus, especially OST-resistant strains. Natural products from tropical plants used for human consumption represent a worthy class of substances. Their use could be stimulated in resource-limited setting where the access to expensive antiviral therapies is restricted.
    OBJECTIVE:

    We evaluated the anti-influenza virus activity of agathisflavone derived from Anacardium occidentale L..
    RESULTS:

    The neuraminidase (NA) activity of wild-type and OST-resistant influenza virus was inhibited by agathisflavone, with IC50 values ranging from 20 to 2.0 μM, respectively. Agathisflavone inhibited influenza virus replication with EC50 of 1.3 μM. Sequential passages of the virus in the presence of agathisflavone reveled the emergence of mutation R249S, A250S and R253Q in the NA gene. These changes are outside the OST binding region, meaning that agathisflavone targets this viral enzyme at a region different than conventional NAIs.
    CONCLUSION:

    Altogether our data suggest that agathisflavone has a promising chemical structure for the development of anti-influenza drugs.
    Copyright? Bentham Science Publishers; For any queries, please email at epub@benthamscience.net.


    KEYWORDS:

    Agathisflavone; Anacardiaceae; Anacardium occidentale L; antiviral; flavonoid; influenza

    PMID: 31854280 DOI: 10.2174/1568026620666191219150738

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