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Protective efficacy of influenza group 2 hemagglutinin stem-fragment immunogen vaccines

Sutton, Troy C and Chakraborty, Saborni and Mallajosyula, Vamsee V A and Lamirande, Elaine W and Ganti, Ketaki and Bock, Kevin W and Moore, Ian N and Varadarajan, Raghavan and Subbarao, Kanta (2017) Protective efficacy of influenza group 2 hemagglutinin stem-fragment immunogen vaccines. In: NPJ VACCINES, 2 .

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Official URL: http://dx.doi.org/10.1038/s41541-017-0036-2

Abstract

The stem of the influenza A virus hemagglutinin (HA) is highly conserved and represents an attractive target for a universal influenza vaccine. The 18 HA subtypes of influenza A are phylogenetically divided into two groups, and while protection with group 1 HA stem vaccines has been demonstrated in animal models, studies on group 2 stem vaccines are limited. Thus, we engineered group 2 HA stem-immunogen (SI) vaccines targeting the epitope for the broadly neutralizing monoclonal antibody CR9114 and evaluated vaccine efficacy in mice and ferrets. Immunization induced antibodies that bound to recombinant HA protein and viral particles, and competed with CR9114 for binding to the HA stem. Mice vaccinated with H3 and H7-SI were protected from lethal homologous challenge with X-79 (H3N2) or A/Anhui/1/2013 (H7N9), and displayed moderate heterologous protection. In ferrets, H7-SI vaccination did not significantly reduce weight loss or nasal wash titers after robust 107 TCID50 H7N9 virus challenge. Epitope mapping revealed ferrets developed lower titers of antibodies that bound a narrow range of HA stem epitopes compared to mice, and this likely explains the lower efficacy in ferrets. Collectively, these findings indicate that while group 2 SI vaccines show promise, their immunogenicity and efficacy are reduced in larger outbred species, and will have to be enhanced for successful translation to a universal vaccine.

Item Type: Journal Article
Additional Information: Copy right for this article belong to the NATURE PUBLISHING GROUP, MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND
Department/Centre: Division of Biological Sciences > Molecular Biophysics Unit
Depositing User: Id for Latest eprints
Date Deposited: 02 Mar 2018 15:05
Last Modified: 02 Mar 2018 15:05
URI: http://eprints.iisc.ac.in/id/eprint/58926

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