Human vaccination against Plasmodium vivax Duffy-binding protein induces strain-transcending antibodies

Payne, R. O. et al. (2017) Human vaccination against Plasmodium vivax Duffy-binding protein induces strain-transcending antibodies. JCI Insight, 2(12), e93683. (doi: 10.1172/jci.insight.93683) (PMID:28614791) (PMCID:PMC5470884)

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BACKGROUND. Plasmodium vivax is the most widespread human malaria geographically; however, no effective vaccine exists. Red blood cell invasion by the P. vivax merozoite depends on an interaction between the Duffy antigen receptor for chemokines (DARC) and region II of the parasite’s Duffy-binding protein (PvDBP_RII). Naturally acquired binding-inhibitory antibodies against this interaction associate with clinical immunity, but it is unknown whether these responses can be induced by human vaccination. METHODS. Safety and immunogenicity of replication-deficient chimpanzee adenovirus serotype 63 (ChAd63) and modified vaccinia virus Ankara (MVA) viral vectored vaccines targeting PvDBP_RII (Salvador I strain) were assessed in an open-label dose-escalation phase Ia study in 24 healthy UK adults. Vaccines were delivered by the intramuscular route in a ChAd63-MVA heterologous prime-boost regimen using an 8-week interval. RESULTS. Both vaccines were well tolerated and demonstrated a favorable safety profile in malaria-naive adults. PvDBP_RII–specific ex-vivo IFN-γ T cell, antibody-secreting cell, memory B cell, and serum IgG responses were observed after the MVA boost immunization. Vaccine-induced antibodies inhibited the binding of vaccine homologous and heterologous variants of recombinant PvDBP_RII to the DARC receptor, with median 50% binding-inhibition titers greater than 1:100. CONCLUSION. We have demonstrated for the first time to our knowledge that strain-transcending antibodies can be induced against the PvDBP_RII antigen by vaccination in humans. These vaccine candidates warrant further clinical evaluation of efficacy against the blood-stage P. vivax parasite.

Item Type:Articles
Additional Information:Support was provided by the UK Medical Research Council, UK National Institute of Health Research Oxford Biomedical Research Centre, and the Wellcome Trust.
Glasgow Author(s) Enlighten ID:Otto, Dr Thomas
Authors: Payne, R. O., Silk, S. E., Elias, S. C., Milne, K. H., Rawlinson, T. A., Llewellyn, D., Shakri, A. R., Jin, J., Labbé, G. M., Edwards, N. J., Poulton, I. D., Roberts, R., Farid, R., Jørgensen, T., Alanine, D. G.W., de Cassan, S. C., Higgins, M. K., Otto, T. D., McCarthy, J. S., de Jongh, W. A., Nicosia, A., Moyle, S., Hill, A. V.S., Berrie, E., Chitnis, C. E., Lawrie, A. M., and Draper, S. J.
College/School:College of Medical Veterinary and Life Sciences > Institute of Infection Immunity and Inflammation
Journal Name:JCI Insight
Publisher:American Society for Clinical Investigation
ISSN (Online):2379-3708
Copyright Holders:Copyright © 2017 ASCI
First Published:First published in JCI Insights 2(12):e93683
Publisher Policy:Reproduced under a Creative Commons License

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