Epitopes described in "Potent induction of focused Th1-type cellular and humoral immune responses by RTS,S/SBAS2, a recombinant Plasmodium falciparum malaria vaccine."

Reference
Article Authors:A Lalvani; P Moris; G Voss; A A Pathan; K E Kester; R Brookes; E Lee; M Koutsoukos; M Plebanski; M Delchambre; K L Flanagan; C Carton; M Slaoui; C Van Hoecke; W R Ballou; A V Hill; J Cohen
Article Title:Potent induction of focused Th1-type cellular and humoral immune responses by RTS,S/SBAS2, a recombinant Plasmodium falciparum malaria vaccine.
Reference Detail
Reference ID:1002645
Abstract:The RTS,S/SBAS2 vaccine confers sterile protection against Plasmodium falciparum sporozoite challenge. The mechanisms underlying this are of great interest, yet little is known about the immune effector mechanisms induced by this vaccine. The immune responses induced by RTS,S/SBAS2 were characterized in 10 malaria-naive volunteers. Several epitopes in the circumsporozoite protein (CSP) were identified as targets of cultured interferon (IFN)-gamma-secreting CD4+ T cells. RTS,S-specific IFN-gamma-secreting effector T cells were induced in 8 subjects; this ex vivo response mapped to a single peptide in Th2R. CSP-specific CD8+ cytotoxic T lymphocytes were not detected. RTS, S-specific IFN-gamma production was universal, whereas interleukin-4 and -5 production was rare. RTS,S-specific lymphoproliferative responses and antibodies to CSP were strongly induced in all volunteers. Responses waned with time but were boostable. Thus, RTS, S/SBAS2 is a potent inducer of Th1-type cellular and humoral immunity. These results highlight possible immune mechanisms of protection and have important implications for vaccine design in general.
Affiliations:Nuffield Dept. of Clinical Medicine, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DU, United Kingdom. ajit.lalvani@ndm. ox.ac.uk
Date:1999
Reference Type:Literature
PubMed ID:10515829
Journal:J Infect Dis
Journal Volume:180
Article Pages:1656-64
Journal ISSN:1537-6613
Article Chemical List:Antibodies, Protozoan;Epitopes;Hepatitis B Surface Antigens;Malaria Vaccines;Peptides;Protozoan Proteins;Vaccines, Synthetic;Interferon-gamma
Article MeSH List:Adult; Amino Acid Sequence; Animals; Antibodies, Protozoan(blood); CD4-Positive T-Lymphocytes(immunology); Epitopes(chemistry); Hepatitis B Surface Antigens(immunology); Humans; Interferon-gamma(biosynthesis); Lymphocyte Activation; Malaria Vaccines(administration & dosage; immunology); Malaria, Falciparum(prevention & control); Middle Aged; Molecular Sequence Data; Peptides(immunology); Plasmodium falciparum(immunology); Protozoan Proteins(immunology); T-Lymphocytes, Regulatory(immunology); Th1 Cells(immunology); Vaccination; Vaccines, Synthetic(administration & dosage; immunology)
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