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Cellular immunity to merozoite surface protein 2 (FC27 and 3D7) in Papua New Guinean children. Temporal variation and relation to clinical and parasitological status
Author(s) -
ALYAMAN F.,
GENTON B.,
TARAIKA J.,
ANDERS R.,
ALPERS M.P.
Publication year - 1997
Publication title -
parasite immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 75
eISSN - 1365-3024
pISSN - 0141-9838
DOI - 10.1046/j.1365-3024.1997.d01-198.x
Subject(s) - merozoite surface protein , biology , plasmodium falciparum , immunology , cytokine , malaria , lymphoproliferative response , cellular immunity , antigen , immunity , immune system , malaria vaccine , in vitro , peripheral blood mononuclear cell , biochemistry
A prospective study in 207 children aged 0.5–15 years was carried out in a highly endemic area of Papua New Guinea to examine the relationship between cellular responses to Plasmodium falciparum merozoite surface protein 2 (MSP2) and malaria infection and morbidity. In vitro proliferation, IFN‐γ and IL‐4 induction were measured against two recombinant proteins of MSP2, FC27 and 3D7 as well as against a form of the 3D7 MSP2 lacking the central repetitive sequences (d3D7). The prevalence of proliferative response was generally low, 6% for FC27, 9% for 3D7 and 11% for d3D7. A higher prevalence of IL‐4 response was obtained being 27% for FC27, 34% for 3D7 and 30% for d3D7 while the prevalence of IFN‐γ response was 13%, 15% and 18%, respectively. There was no correlation between age and proliferative responses; in contrast cytokine production increased with age for all three antigens. When proliferation or stimulation of either cytokine was used to assess T‐cell activation the frequency of responders increased to 39%, 47% and 46% for FC27, 3D7 and d3D7 respectively. Analysis of the relation of T cell responses to concurrent infection and morbidity showed that lymphoproliferative response only to d3D7 was significantly associated with parasitaemia; while lymphoproliferative responses to all 3 MSP2 antigens were highest in the group of clinical malaria cases. There was no significant correlation between proliferation or cytokine production to MSP2 and concurrent or subsequent malaria morbidity.