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. 2008 Feb;76(2):759-66.
doi: 10.1128/IAI.01147-07. Epub 2007 Dec 10.

Humoral responses to Plasmodium falciparum blood-stage antigens and association with incidence of clinical malaria in children living in an area of seasonal malaria transmission in Burkina Faso, West Africa

Issa Nebie  1 , Amidou Diarra, Alphonse Ouedraogo, Issiaka Soulama, Edith C Bougouma, Alfred B Tiono, Amadou T Konate, Roma Chilengi, Michael Theisen, Daniel Dodoo, Ed Remarque, Samuel Bosomprah, Paul Milligan, Sodiomon B Sirima
Affiliations

Humoral responses to Plasmodium falciparum blood-stage antigens and association with incidence of clinical malaria in children living in an area of seasonal malaria transmission in Burkina Faso, West Africa

Issa Nebie et al. Infect Immun. 2008 Feb.

Abstract

There is longstanding evidence that immunoglobulin G (IgG) has a role in protection against clinical malaria, and human antibodies of the cytophilic subclasses are thought to be particularly critical in this respect. In this cohort study, 286 Burkinabè children 6 months to 15 years old were kept under malaria surveillance in order to assess the protective role of antibody responses against four antigens which are currently being evaluated as vaccine candidates: apical membrane antigen 1 (AMA1), merozoite surface protein 1-19 (MSP1-19), MSP3, and glutamate-rich protein (GLURP). Total IgG, IgM, and IgG subclass responses were measured just before the malaria transmission season. The incidence of malaria was 2.4 episodes per child year of risk. After adjusting for the confounding effects of age, the level of total IgG to GLURP was strongly associated with reduced malaria incidence (incidence rate ratio associated with a doubling of total IgG, 0.79; 95% confidence interval, 0.66 to 0.94; P = 0.009.); there was a borderline statistically significant association between the level of total IgG to MSP3 and malaria incidence and no evidence of an association for total IgG to AMA1 and to MSP1-19. Of the IgG subclass responses studied, only IgG3 and IgG4 against GLURP and IgG1 against AMA1 were associated with reduced risk of clinical malaria. There was no evidence of an interaction between responses to AMA1 and baseline parasitemia in their effects on malaria incidence. Currently included in malaria vaccine formulations for clinical trials in humans, these blood-stage antigens, AMA1 and GLURP, offer good prospects for malaria vaccine development.

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Figures

FIG. 1.
FIG. 1.
Study participant flow chart. Hb, hemoglobin.
FIG. 2.
FIG. 2.
(a) IgG and IgM levels at baseline in relation to age. The line shows the LOESS smoothed estimate of the geometric mean. (b) IgG subclass levels at baseline in relation to age. The line shows the LOESS smoothed estimate of the geometric mean.
See this image and copyright information in PMC

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