Early Interferon-gamma Response against Plasmodium falciparum Correlates with Interethnic Differences in Susceptibility to Parasitemia between Sympatric Fulani and Dogon in Mali


McCall, MBB; Hopman, J; Daou, M; Maiga, B; Dara, V; Ploemen, I; Nganou-Makamdop, K; Niangaly, A; Tolo, Y; Arama, C; Bousema, JT; van der Meer, JW; van der Ven, A; Troye-Blomberg, M; Dolo, A; Doumbo, OK; Sauerwein, RW; (2010) Early Interferon-gamma Response against Plasmodium falciparum Correlates with Interethnic Differences in Susceptibility to Parasitemia between Sympatric Fulani and Dogon in Mali. The Journal of infectious diseases, 201 (1). pp. 142-152. ISSN 0022-1899 DOI: https://doi.org/10.1086/648596

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Abstract

Introduction. Interethnic differences in susceptibility to malaria provide a unique opportunity to explore immunological correlates of protection. The Fulani of Sahelian Africa are known for their reduced susceptibility to Plasmodium falciparum, compared with surrounding tribes, yet the immunology underlying this is still poorly understood. Methods and Results. Here, we show that mononuclear cells from Fulani elicit >10-fold stronger interferon (IFN)-gamma production following a 24-h in vitro coincubation with asexual parasites than cells from sympatric Dogon. This response appears to be specific for P. falciparum among a panel of other human pathogens and is independent of the lower number of regulatory T cell counts present in Fulani. IFN-gamma responses in both tribes were inversely correlated with peripheral parasite density as quantified by nucleic acid sequenced-based amplification, but responses of Fulani remained significantly stronger than those of Dogon after adjustment for concurrent parasitemia, suggesting that hard-wired immunological differences underlie the observed protection. Conclusions. These results underscore the value of early IFN-gamma responses to P. falciparum as a correlate of anti-parasite immunity, not only in this setting but also in the wider context of malaria, and support the development of malaria vaccines aimed at inducing such responses.

Item Type: Article
Keywords: regulatory t-cells, ethnic-groups, west-africa, ifn-gamma, humoral, response, immune-system, human malaria, burkina-faso, nk cells, infection
Faculty and Department: Faculty of Infectious and Tropical Diseases > Dept of Immunology and Infection
Research Centre: Malaria Centre
PubMed ID: 19929378
Web of Science ID: 273078000018
URI: http://researchonline.lshtm.ac.uk/id/eprint/4352

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