Humoral and Cellular Immune Responses to Synthetic Peptides from the Plasmodium falciparum Blood-Stage Antigen, Pf155/RESA, in Cameroonian Women

T- and B-cell responses to the Plasmodium falciparum blood-stage antigen Pf155/RESA were investigated in 104 Cameroonian women, half of whom were pregnant. We used purified protein and six synthetic peptides representing T- and B-cell epitopes. In vitro T-cell responses were measured by proliferatio...

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Bibliographic Details
Published in:Clinical immunology and immunopathology 1995-08, Vol.76 (2), p.164-169
Main Authors: Fievet, Nadine, Maubert, Bertrand, Cot, Michel, Chougnet, Claire, Dubois, Béatrice, Bickij, Jean, Migot, Florence, Le Hesran, Jean-Yves, Frobert, Yveline, Deloron, Philippe
Format: Article
Language:English
Subjects:
Adult
Amino Acid Sequence
Animals
Antibody Formation - immunology
Antigens, Protozoan - immunology
Biological and medical sciences
Cameroon - epidemiology
Female
Human protozoal diseases
Humans
Immunity, Cellular - immunology
Infectious diseases
Malaria
Medical sciences
Molecular Sequence Data
Parasitic diseases
Plasmodium falciparum - immunology
Protozoal diseases
Protozoan Proteins - immunology
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Summary:T- and B-cell responses to the Plasmodium falciparum blood-stage antigen Pf155/RESA were investigated in 104 Cameroonian women, half of whom were pregnant. We used purified protein and six synthetic peptides representing T- and B-cell epitopes. In vitro T-cell responses were measured by proliferation and IL2, IFN-γ, and IL4 release. B-cell responses were assessed by plasma antibodies. All peptides induced a cellular response in some individuals. A proliferative response was induced in 25% of the donors by Pf155/ RESA, and in 7 to 11% by any peptide. Cytokine release occurred in 23 to 30% of the Pf155/RESA-stimulated cultures, and in 8 to 25% of the peptide-stimulated cultures. Overall, each peptide induced a cellular response (proliferation and/or cytokine release) in 44% of the donors. T-cells from 23% of the donors failed to respond to any peptide. Responding cells did not usually respond in all readouts, and proliferation and release of any of the three cytokines were not correlated. Similarly, antibody and T-cell responses were not related. Selected epitopes of Pf155/RESA, an important vaccine candidate, are well recognized in naturally exposed individuals and are able to activate T-cells to proliferate and to produce various lymophokines in numerous individuals from a malaria endemic area.
ISSN:0090-1229
1090-2341
DOI:10.1006/clin.1995.1111