An immune basis for malaria protection by the sickle cell trait


Williams, TN; Mwangi, TW; Roberts, DJ; Alexander, ND; Weatherall, DJ; Wambua, S; Kortok, M; Snow, RW; Marsh, K; (2005) An immune basis for malaria protection by the sickle cell trait. PLoS medicine, 2 (5). art. no.-E128. ISSN 1549-1277 DOI: https://doi.org/10.1371/journal.pmed.0020128

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Abstract

Background Malaria resistance by the sickle cell trait (genotype HbAS) has served as the prime example of genetic selection for over half a century. Nevertheless, the mechanism of this resistance remains the subject of considerable debate. While it probably involves innate factors such as the reduced ability of Plasmodium falciparum parasites to grow and multiply in HbAS erythrocytes, recent observations suggest that it might also involve the accelerated acquisition of malaria-specific immunity. Methods and Findings We studied the age-specific protection afforded by HbAS against clinical malaria in children living on the coast of Kenya. We found that protection increased with age from only 20% in the first 2 y of life to a maximum of 56% by the age of 10 y, returning thereafter to 30% in participants greater than 10 y old. Conclusions Our observations suggest that malaria protection by HbAS involves the enhancement of not only innate but also of acquired immunity to the parasite. A better understanding of the underlying mechanisms might yield important insights into both these processes.

Item Type: Article
Keywords: Plasmodium-falciparum malaria, red-cells, mechanism, antigens, hemoglobin, resistance, erythrocytes, infection, responses, children
Faculty and Department: Faculty of Epidemiology and Population Health > Dept of Infectious Disease Epidemiology
Research Centre: Tropical Epidemiology Group
Web of Science ID: 229847900017
URI: http://researchonline.lshtm.ac.uk/id/eprint/13353

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