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. 1991 Oct;74(2):323–328.

Towards the design of heterovalent anti-malaria vaccines: a hybrid immunogen capable of eliciting immune responses to epitopes of circumsporozoite antigens from two different species of the malaria parasite, Plasmodium.

F A Kironde 1, K V Rao 1, S Shah 1, A Kumar 1, N Sahoo 1
PMCID: PMC1384612  PMID: 1721043

Abstract

The peptide CS.T3, corresponding to residues 378-398 of the Plasmodium falciparum (Pf) circumsporozoite (CS) protein sequence (except with cysteines 384 and 389 replaced by alanines), has been found to be almost universally recognized by human and mouse T lymphocytes. When colinearly linked to the repetitive B-lymphocyte-specific epitope (Asn-Ala-Asn-Pro)n of Pf CS protein, CS.T3 induces T-helper activity for an anti-(Asn-Ala-Asn-Pro)n antibody response in mice of different haplotypes. We constructed a double-epitope peptide, CS.T3-R3, by co-linearly joining a truncated 18-mer form (IEKKIAKMEKASSVFNVV) of CS.T3 to three tandem repeats (R3) of a B-cell-specific epitope, QGPGAP, of Plasmodium yoelii (Py) CS protein, via a two-glycine spacer. Whereas CS.T3 and R3 did not induce specific antibodies, CS.T3-R3 elicited anti-CS.T3 and anti-R3 antibodies in different mouse strains. Some human anti-Pf sera from malaria-endemic areas contained high-titred anti-CS.T3 antibody IgG, indicating that parasite-derived CS.T3 contains a B-cell determinant which is maintained in the alanine-substituted synthetic CS.T3. Antibody absorption experiments showed that CS.T3-R3 contains no new B-cell-specific determinants other than R3 and CS.T3. That the Pf CS protein epitope, CS.T3, supports T-cell help for antibody responses against the Py CS protein repeat epitope, QGPGAP, implies the possible use of CS.T3 in anti-sporozoite multiple-epitope vaccines against different species of Plasmodium. Colinearly linking CS.T3 to R3, via a two-glycine spacer, appears to be a useful model by which different T- and B-cell-specific determinants can be jointed into a heterovalent immunogen while retaining their distinct immunological properties.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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