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Type: Journal article
Title: Vaccination with conserved regions of erythrocyte-binding antigens induces neutralizing antibodies against multiple strains of Plasmodium falciparum
Author: Healer, J.
Thompson, J.
Riglar, D.
Wilson, D.
Chiu, Y.
Miura, K.
Chen, L.
Hodder, A.
Long, C.
Hansen, D.
Baum, J.
Cowman, A.
Citation: PLoS One, 2013; 8(9):e72504-1-e72504-12
Publisher: Public Library of Science
Issue Date: 2013
ISSN: 1932-6203
Statement of
Julie Healer, Jennifer K. Thompson, David T. Riglar, Danny W. Wilson, Yu-H.C. Chiu, Kazutoyo Miura, Lin Chen, Anthony N. Hodder, Carole A. Long, Diana S. Hansen, Jake Baum, Alan F. Cowman
Abstract: Background: A highly effective vaccine against Plasmodium falciparum malaria should induce potent, strain transcending immunity that broadly protects against the diverse population of parasites circulating globally. We aimed to identify vaccine candidates that fulfill the criteria. Methods: We have measured growth inhibitory activity of antibodies raised to a range of antigens to identify those that can efficiently block merozoite invasion for geographically diverse strains of P. falciparum. Results: This has shown that the conserved Region III-V, of the P. falciparum erythrocyte-binding antigen (EBA)-175 was able to induce antibodies that potently inhibit merozoite invasion across diverse parasite strains, including those reliant on invasion pathways independent of EBA-175 function. Additionally, the conserved RIII-V domain of EBA-140 also induced antibodies with strong in vitro parasite growth inhibitory activity. Conclusion: We identify an alternative, highly conserved region (RIV-V) of EBA-175, present in all EBA proteins, that is the target of potent, strain transcending neutralizing antibodies, that represents a strong candidate for development as a component in a malaria vaccine.
Keywords: Animals; Rabbits; Humans; Plasmodium falciparum; Malaria, Falciparum; Immunoglobulin G; Protozoan Proteins; Malaria Vaccines; Antibodies, Protozoan; Antigens, Protozoan; Vaccination; Epitope Mapping; Inhibitory Concentration 50; Species Specificity; Amino Acid Sequence; Conserved Sequence; Host-Parasite Interactions; Antibodies, Neutralizing
Rights: © 2013 Healer et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
RMID: 0020138013
DOI: 10.1371/journal.pone.0072504
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Appears in Collections:Microbiology and Immunology publications

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