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- W4313385951 abstract "Abstract The recent discovery of broadly-neutralizing antibodies that target the hemagglutinin stalk domain has renewed hope that the development of “universal” influenza virus vaccines may be within reach. To this end, we have examined the functions of hemagglutinin stalk-binding antibodies in an endogenous setting - as polyclonal preparations isolated from human sera. Relative to monoclonal antibodies that bind to the HA head domain, the neutralization potency of monoclonal stalk-binding antibodies was vastly inferior in vitro, but was enhanced by several orders of magnitude in the polyclonal context. Furthermore, we demonstrated a surprising enhancement in IgA-mediated HA stalk neutralization relative to that achieved by antibodies of IgG isotypes. Mechanistically, this could be explained in two ways. Identical variable regions consistently neutralized virus more potently when in an IgA backbone compared to an IgG backbone. Additionally, HA-specific memory B cells isolated from human peripheral blood were more likely to be stalk-specific when secreting antibodies of IgA isotypes compared to those secreting IgG. Taken together, our data provide strong evidence that HA stalk-binding antibodies perform optimally when in a polyclonal context, and that the targeted elicitation of HA stalk-specific IgA should be an important consideration during “universal” influenza virus vaccine design." @default.
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- W4313385951 date "2015-05-01" @default.
- W4313385951 modified "2023-09-27" @default.
- W4313385951 title "Broadly-neutralizing anti-influenza virus antibodies: Enhancement of neutralizing potency in polyclonal mixtures and IgA backbones (VIR5P.1141)" @default.
- W4313385951 doi "https://doi.org/10.4049/jimmunol.194.supp.148.9" @default.
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