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A humanized mouse model identifies key amino acids for low immunogenicity of H7N9 vaccines.

Abstract：

:Influenza vaccines of H7N9 subtype are consistently less immunogenic in humans than vaccines developed for other subtypes. Although prior immunoinformatic analysis identified T-cell epitopes in H7 hemagglutinin (HA) which potentially enhance regulatory T cell response due to conservation with the human genome, the links between the T-cell epitopes and low immunogenicity of H7 HA remains unknown due to the lack of animal models reproducing the response observed in humans. Here, we utilized a humanized mouse model to recapitulate the low immunogenicity of H7 HA. Our analysis demonstrated that modification of a single H7 epitope by changing 3 amino acids so that it is homologous with a known H3 immunogenic epitope sequence significantly improved the immunogenicity of the H7 HA in the humanized mouse model, leading to a greater than 4-fold increase in HA-binding IgG responses. Thus, we provide experimental evidence for the important contribution of this H7-specific T cell epitope in determining the immunogenicity of an influenza vaccine. Furthermore, this study delineates strategies that can be used for screening and selecting vaccine strains using immunoinformatics tools and a humanized mouse model.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Wada Y,Nithichanon A,Nobusawa E,Moise L,Martin WD,Yamamoto N,Terahara K,Hagiwara H,Odagiri T,Tashiro M,Lertmemongkolchai G,Takeyama H,De Groot AS,Ato M,Takahashi Y

doi

10.1038/s41598-017-01372-5

subject

Has Abstract

pub_date

2017-04-28 00:00:00

pages

1283

issue

1

issn

2045-2322

pii

10.1038/s41598-017-01372-5

journal_volume

7

pub_type

杂志文章

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