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• W3086796595 abstract "The influenza virus neuraminidase (NA) plays an integral role in the influenza virus life cycle through the release of virions from infected cells. NA-specific antibodies can impede virus replication by binding to the NA and blocking its enzymatic activity, providing significant protection from influenza-associated morbidity and mortality. NA included in current seasonal influenza virus vaccines exhibits low immunogenicity, potentially caused by compromised antigenic integrity during vaccine production. To determine how certain types of “stress” could influence the antigenicity of NA we performed a series of in vitro experiments where we treated NA with formalin, EDTA or heat and measured the impact of these treatments on NA enzymatic activity and structural integrity. We found that increasing concentrations of formalin or EDTA and increasing temperature abolished the enzymatic activity of both H1N1, H3N2, and influenza B purified viruses and recombinant NA proteins. However, formalin and EDTA treatment did not drastically affect conformational epitopes found on the NA, whereas heat treatment abolished conformational epitopes. We next performed a vaccination experiment, where mice were vaccinated with recombinant N2 NA treated with 0.3% formalin or 0.125 M EDTA (which both inactivated NA activity) were protected from virus challenge while animals vaccinated with heat treated NA were not. We next tested the protective effect of monomeric (no enzymatic activity) versus tetrameric (highly active) N1 NA. Again, only the tetrameric form protected mice from challenge while the monomeric form did not. Together, our data demonstrate that enzymatically active NA is not required to induce protective antibody responses as a vaccine, however a correctly folded NA is essential." @default.
• W3086796595 created "2020-09-21" @default.
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• W3086796595 date "2020-10-01" @default.
• W3086796595 modified "2023-10-17" @default.
• W3086796595 title "Correctly folded - but not necessarily functional - influenza virus neuraminidase is required to induce protective antibody responses in mice" @default.
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• W3086796595 doi "https://doi.org/10.1016/j.vaccine.2020.08.067" @default.
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