Envelope-dimer epitope-like broadly protective antibodies against dengue in children following natural infection and vaccination
Mpingabo, P.; Ylade, M.; Aogo, R.; Crisostomo, M. V.; Thiono, D.; Daag, J.; Agrupis, K.-A.; Coello Escoto, A.; Raimundi Rodriguez, G.; Odio, C.; Abad Fernandez, M.; White, L.; de Silva, A.; Deen, J.; Katzelnick, L.
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Cross-reactive antibodies (Abs) to epitopes that span envelope proteins on the virion surface are hypothesized to protect against dengue. Here, we measured Abs targeting the quaternary envelope dimer epitope (EDE) as well as neutralizing and binding Abs and evaluate their association with dengue virus (DENV) infection, vaccine response, and disease outcome in dengue vaccinated and unvaccinated children (n=252) within a longitudinal cohort in Cebu, Philippines (n=2,996). Abs targeting EDE were prevalent and strongly associated with broad neutralization of DENV1-4 in those with baseline multitypic immunity. Subsequent natural infection and vaccination boosted EDE-like, neutralizing, and binding Abs. EDE-like Abs were associated with reduced dengue risk and mediated the protective effect of binding and neutralizing Abs on symptomatic and severe dengue. Thus, Abs targeting quaternary epitopes help explain broad cross protection in those with multiple prior DENV exposures, making them useful for evaluation and development of future vaccines and therapeutics.
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