Protection against Plasmodium chabaudi malaria induced by immunization with apical membrane antigen 1 and merozoite surface protein 1 in the absence of gamma interferon or interleukin-4

Infection and Immunity
James M BurnsWilliam P Weidanz

Abstract

Strategies to optimize formulations of multisubunit malaria vaccines require a basic knowledge of underlying protective immune mechanisms induced by each vaccine component. In the present study, we evaluated the contribution of antibody-mediated and cell-mediated immune mechanisms to the protection induced by immunization with two blood-stage malaria vaccine candidate antigens, apical membrane antigen 1 (AMA-1) and merozoite surface protein 1 (MSP-1). Immunologically intact or selected immunologic knockout mice were immunized with purified recombinant Plasmodium chabaudi AMA-1 (PcAMA-1) and/or the 42-kDa C-terminal processing fragment of P. chabaudi MSP-1 (MSP-1(42)). The efficacy of immunization in each animal model was measured as protection against blood-stage P. chabaudi malaria. Immunization of B-cell-deficient JH(-/-) mice indicated that PcAMA-1 vaccine-induced immunity is largely antibody dependent. In contrast, JH(-/-) mice immunized with PcMSP-1(42) were partially protected against P. chabaudi malaria, indicating a role for protective antibody-dependent and antibody-independent mechanisms of immunity. The involvement of gammadelta T cells in vaccine-induced PcAMA-1 and/or PcMSP-1(42) protection was minor. Analysis of t...Continue Reading

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Citations

Sep 2, 2009·Infection and Immunity·Estrella MonteroCheryl A Lobo
Dec 13, 2006·Infection and Immunity·Qifang ShiJames M Burns
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