Inducing protective antibodies against ring-infected erythrocyte surface peptide antigen of Plasmodium falciparum using immunostimulating complex (ISCOMs) delivery.

Abstract:

:In the present study, synthetic peptides (EENVEHDA)2 [(oc)2] and (DDEHVEEPTVA)2 [(un)2] of ring-infected erythrocyte surface antigen (RESA) of Plasmodlium filciparum were linked with palmitic acid and entrapped in immunostimulating complexes (ISCOMs). The immunogenicity of the peptide(s) and mixture of peptides were studied in mice with different genetic background. Peptide(s) entrapped in ISCOMs using a low-dose immunization strategy generated high-titer as well as high-affinity antibodies. Interestingly, no genetic restriction of the immune response was observed in any of the strains studied. The IgG subclass pattern with the peptide(s) showed predominately IgG2a/2b isotypes, while with the mixed peptide formulation, (un)2-specific IgG isotype pattern showed induction of both IgG1 and IgG2a/2b isotypes. These cytophilic antibodies inhibited the ring as well as schizont stage and total parasite growth during in vitro merozoite reinvasion inhibition study. In the mixed peptide preparation, the same pattern of immune response was achieved as that of individual peptide(s) using ISCOMs delivery. Therefore, the entrapment of otherwise poorly immunogenic synthetic peptides in ISCOMs resulted in increased immunogenicity followed by strong secondary response and can be adopted for developing subunit immunogen formulation against malarial parasite.

journal_name

Med Microbiol Immunol

authors

Chopra N,Biswas S,Thomas B,Sabhnani L,Rao DN

doi

10.1007/s004300000042

keywords:

subject

Has Abstract

pub_date

2000-11-01 00:00:00

pages

75-83

issue

2

eissn

0300-8584

issn

1432-1831

journal_volume

189

pub_type

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