Adenovectors induce functional antibodies capable of potent inhibition of blood stage malaria parasite growth.

Abstract:

:An effective malaria vaccine remains a global health priority. Recombinant adenoviruses are a promising vaccine platform, and Plasmodium falciparum apical membrane antigen 1 (AMA1) and merozoite surface protein 1-42 (MSP1(42)) are leading blood stage vaccine candidates. We evaluated the importance of surface antigen localization and glycosylation on the immunogenicity of adenovector delivered AMA1 and MSP1(42) and assessed the ability of these vaccines to induce functional antibody responses capable of inhibiting parasite growth in vitro. Adenovector delivery induced unprecedented levels of biologically active antibodies in rabbits as indicated by the parasite growth inhibition assay. These responses were as potent as published results using any other vaccine system, including recombinant protein in adjuvant. The cell surface associated and glycosylated forms of AMA1 and MSP1(42) elicited 99% and 60% inhibition of parasite growth, respectively. Antigens that were expressed at the cell surface and glycosylated were much better than intracellular antigens at inducing antibody responses. Good T cell responses were observed for all forms of AMA1 and MSP1(42). Antigen-specific antibody responses, but typically not T cell responses, were boosted by a second administration of adenovector. These data highlight the importance of rational vaccine design and support the advancement of adenovector delivery technology for a malaria vaccine.

journal_name

Vaccine

journal_title

Vaccine

authors

Bruder JT,Stefaniak ME,Patterson NB,Chen P,Konovalova S,Limbach K,Campo JJ,Ettyreddy D,Li S,Dubovsky F,Richie TL,King CR,Long CA,Doolan DL

doi

10.1016/j.vaccine.2010.02.024

subject

Has Abstract

pub_date

2010-04-19 00:00:00

pages

3201-10

issue

18

eissn

0264-410X

issn

1873-2518

pii

S0264-410X(10)00192-1

journal_volume

28

pub_type

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