title: Immunogenicity of single versus mixed allele vaccines of Plasmodium vivax Duffy binding protein region II.
abstract: The Duffy binding protein (DBP) of Plasmodium vivax is vital for host erythrocyte invasion. DBP region II (DBPII) contains critical residues for receptor recognition and anti-DBPII antibodies have been shown to inhibit erythrocyte binding and invasion, thereby making the molecule an attractive vaccine candidate against P. vivax blood stages. Similar to other blood-stage antigens, allelic variation within the DBPII and associated strain-specific immunity is a major challenge for development of a broadly effective vaccine against P. vivax malaria. We hypothesized that immunization with a vaccine composed of multiple DBP alleles or a modified epitope DBP (DEKnull) will be more effective in producing a broadly reactive and inhibitory antibody response to diverse DBPII alleles than a single allele vaccine. In this study, we compared single, naturally occurring DBPII allele immunizations (Sal1, 7.18, P) and DEKnull with a combination of (Sal1, 7.18, P) alleles. Quantitative analysis by ELISA demonstrated that the multiple allele vaccine tend to be more immunogenic than any of the single allele vaccines when tested for reactivity against a panel of DBPII allelic variants whereas DEKnull was less immunogenic than the mixed-allele vaccine but similar in reactivity to the single allele vaccines. Further analysis for functional efficacy by in vitro erythrocyte-binding inhibition assays demonstrated that the multiple allele immunization produced a stronger strain-neutralizing response than the other vaccination strategies even though inhibition remained biased toward some alleles. Overall, there was no correlation between antibody titer and functional inhibition. These data suggest that a multiple allele vaccine may enhance immunogenicity of a DBPII vaccine but further investigation is required to optimize this vaccine strategy to achieve broader coverage against global P. vivax strains.
authors.affiliation: Department of Global Health, College of Public Health, University of South Florida, 3720 Spectrum Boulevard, Suite 304, Tampa, FL 33612, USA.
authors.forename: Francis B
authors.initials: FB
authors.lastname: Ntumngia
authors.forename: Jesse
authors.initials: J
authors.lastname: Schloegel
authors.forename: Amy M
authors.initials: AM
authors.lastname: McHenry
authors.forename: Samantha J
authors.initials: SJ
authors.lastname: Barnes
authors.forename: Miriam T
authors.initials: MT
authors.lastname: George
authors.forename: Sandra
authors.initials: S
authors.lastname: Kennedy
authors.forename: John H
authors.initials: JH
authors.lastname: Adams
mesh_terms: D000818:Animals; D000913:Antibodies, Protozoan / Q000097:blood* / Q000276:immunology; D000917:Antibody Formation / Q000276:immunology; D000953:Antigens, Protozoan / Q000008:administration & dosage / Q000276:immunology*; D019556:COS Cells; D002460:Cell Line; D002522:Chlorocebus aethiops; D004912:Erythrocytes / Q000469:parasitology*; D014644:Genetic Variation / Q000276:immunology; D006801:Humans; D017780:Malaria Vaccines / Q000276:immunology*; D016780:Malaria, Vivax / Q000276:immunology / Q000517:prevention & control; D051379:Mice; D008807:Mice, Inbred BALB C; D010966:Plasmodium vivax / Q000276:immunology*; D015800:Protozoan Proteins / Q000008:administration & dosage / Q000276:immunology*; D011956:Receptors, Cell Surface / Q000008:administration & dosage / Q000276:immunology*
chemical_list: D000913:Antibodies, Protozoan; D000953:Antigens, Protozoan; C066001:Duffy antigen binding protein, Plasmodium; D017780:Malaria Vaccines; D015800:Protozoan Proteins; D011956:Receptors, Cell Surface
keywords: AMA1; DARC; DBP; DBP region II; DBPII; Duffy antigen receptor for chemokines; Duffy binding protein (DBP); MSP1; Malaria; Multiple alleles; Plasmodium vivax; Vaccines; apical membrane antigen-1; merozoite surface protein-1; rDBPII; recombinant rDBPII
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