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The Journal of Immunology, Vol 153, Issue 1 190-204, Copyright © 1994 by American Association of Immunologists
ARTICLES |
DA Fidock, H Gras-Masse, JP Lepers, K Brahimi, L Benmohamed, S Mellouk, C Guerin-Marchand, A Londono, L Raharimalala and JF Meis
Bio-Medical Parasitology Laboratory, Pasteur Institute, Paris, France.
We have previously identified a Plasmodium falciparum liver stage- specific Ag (LSA-1) found to encode tandem 17 amino acid repeats harboring B cell determinants. Here we extend this study in terms of sequence analysis, protein localization, and immunologic properties. Analysis of the N- and C-terminal regions of LSA-1 from the T9/96 clone reveals high sequence conservation with LSA-1 from NF54. This 200-kDa protein is detected throughout liver schizogony and accumulates in the parasitophorous vacuole space. In our investigation of T and B cell responses to LSA-1, we have focused on both the area of the C-terminal, nonrepetitive "hinge" region and the conserved repetitive region and derived synthetic peptides. These were found to contain major B and T cell determinants. High prevalences and elevated Ab levels to LSA-1, directed primarily, although not exclusively, to the repetitive region, were detected in sera of individuals from one moderately high and two low transmission malaria-endemic areas (prevalences of 97%, 75, and 77%, respectively). In one of these low transmission areas, secretion of the cytokine IFN-gamma, known to inhibit malaria liver stages, and T cell proliferation were detected in PBMC of 22 to 48% and 6 to 20%, respectively, of individuals in response to separate LSA-1 peptides. These results complement the recent finding of conserved CTL epitopes in LSA-1 and support the assertion that immune responses to LS Ag are involved in protection against malaria pre-erythrocytic stages.
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