Immunogenicity and Efficacy Evaluation of Subunit Astrovirus Vaccines

Mehdi R M Bidokhti*, Karin Ullman, Anne Sofie Hammer , Trine Hammer Jensen, Mariann Chriél, Siddappa N Byrareddy, Claudia Baule

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

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    Abstract

    A full understanding of the immune response to astrovirus (AstV) infection is required to treat and control AstV-induced gastroenteritis. Relative contributions of each arm of the immune system in restricting AstV infection remain unknown. In this study, two novel subunit AstV vaccines derived from capsid protein (CP) of mink AstV (MAstV) such as CPΔN (spanning amino acids 161-775) and CPΔC (spanning amino acids 1-621) were evaluated. Their immunogenicity and cytokine production in mice, as well as protective efficacy in mink litters via maternal immunization, were studied. Truncated CPs induced higher levels of serum anti-CP antibodies than CP, with the highest level for CPΔN. No seronegativity was detected after booster immunization with either AstV CP truncates in both mice and mink. All mink moms stayed seropositive during the entire 104-day study. Furthermore, lymphoproliferation responses and Th1/Th2 cytokine induction of mice splenocytes ex vivo re-stimulated by truncated CPs were significantly higher than those by CP, with the highest level for CPΔN. Immunization of mink moms with truncated CPs could suppress virus shedding and clinical signs in their litters during a 51-day study after challenge with a heterogeneous MAstV strain. Collectively, AstV truncated CPs exhibit better parameters for protection than full-length CP.
    Original languageEnglish
    Article number79
    JournalHuman Vaccines & Immunotherapeutics
    Volume7
    Issue number3
    Number of pages20
    ISSN2164-5515
    DOIs
    Publication statusPublished - 2019

    Keywords

    • astrovirus
    • capsid protein
    • immunogenicity
    • infection
    • subunit vaccine

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