T-cell Epitopes in Pf155/RESA, a Major Candidate for a Plasmodium Falciparum Malaria Vaccine

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1988 Aug 1

PMID 2456577

Citations 15

Authors

L Kabilan

M Troye-Blomberg

H Perlmann

G Andersson

B Hogh

E Petersen

A Bjorkman

P Perlmann

Affiliations

Soon will be listed here.

Abstract

Immunogens included in a subunit vaccine should contain both B- and T-cell-activating sites to ensure anamnestic responses following reinfection after vaccination as well as antibody-independent cellular immunity. The Plasmodium falciparum antigen Pf155/RESA, a major candidate for a vaccine against the asexual blood stages of this malaria parasite, was investigated for T-cell epitopes in its C-terminal amino acid repeat region, a region known to be conserved in different P. falciparum strains. It was found to contain several related sequences that activated T cells from humans primed to P. falciparum by natural exposure, to proliferation, and/or interferon-gamma release in vitro. T cells from approximately half of the donor group investigated responded to the intact protein, and 65% of these responders also responded to short synthetic peptides, probably representing a small number of partly overlapping T-cell epitopes. Thus, sequences from the C terminus of Pf155 may be suitable constituents of a P. falciparum subunit vaccine and also provide a basis for epitope-specific epidemiological studies relating cellular immune responses in vitro to clinical immunity and P. falciparum endemicity.

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