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. 1997 Dec;65(12):5082–5087. doi: 10.1128/iai.65.12.5082-5087.1997

T-cell immunity to peptide epitopes of liver-stage antigen 1 in an area of Papua New Guinea in which malaria is holoendemic.

M Connelly 1, C L King 1, K Bucci 1, S Walters 1, B Genton 1, M P Alpers 1, M Hollingdale 1, J W Kazura 1
PMCID: PMC175732  PMID: 9393799

Abstract

Liver-stage antigen 1 (LSA1) is one of several pre-erythrocytic antigens considered for inclusion in a multiantigen, multistage subunit vaccine against falciparum malaria. We examined T-cell proliferation and cytokine responses to peptides corresponding to amino acids 84 to 107, 1813 to 1835, and 1888 to 1909 of LSA1 in asymptomatic adults living in an area of Papua New Guinea where malaria is holoendemic. Whereas T cells from North Americans never exposed to malaria did not respond to any of the peptides, those from 52 of 55 adults from the area where malaria is endemic had vigorous proliferation responses to one or more of the LSA1 peptides (mean stimulation indices of 6.8 to 7.2). Gamma interferon (IFN-gamma) production driven by LSA1 peptides ranged from 34 to more than 3,500 pg/2 x 10(6) cells, was derived primarily from CD8+ cells, and was dissociated from T-cell proliferation. The frequencies of IFN-gamma response to the amino acid 1819 to 1835 and 1888 to 1909 peptides were significantly greater than that to the amino acid 84 to 107 peptide (87 and 88% versus 33% of subjects; P < 0.0001). In contrast to proliferation and IFN-gamma, interleukin 4 (IL-4) and/or IL-5 responses to LSA1 peptides were detected in only 18% of the subjects. These data show that T-cell immunity to epitopes in the N- and C-terminal regions of LSA1 are common in persons living in this area of Papua New Guinea where malaria is endemic. The dominance of type 1 CD8 cell IFN-gamma responses is consistent with a role for this T-cell population in immunity to liver-stage Plasmodium falciparum in humans.

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Selected References

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