Antibody responses to a C-terminal fragment of the Plasmodium falciparum blood-stage antigen Pf332 in Senegalese individuals naturally primed to the parasite

Author:

Israelsson E1,Balogun H1,Vasconcelos N-M1,Beser J12,Roussilhon C3,Rogier C4,Trape J F5,Berzins K1

Affiliation:

1. Department of Immunology, Wenner-Gren Institute, Stockholm University, Stockholm

2. Mycology Section, Department of Parasitology, Mycology and Environmental Microbiology Swedish Institute for Infectious Disease Control (SMI), Solna, Sweden

3. Immunology Unit, Pasteur Institut de Dakar, Senegal and Unité de Parasitologie Biomedicale, Institut Pasteur, Paris

4. Institut de Médecine Tropicale de Santé des Armées, Marseille

5. Institut de Researchers pour le Développement, Montpellier, France

Abstract

Summary Previous studies have shown that antibodies from humans exposed continuously to malaria recognize the Plasmodium falciparum asexual blood-stage antigen Pf332. Here we analysed the antibody responses to a C-terminal fragment of Pf332, designated C231, in individuals from Senegal, by measuring the serum levels of immunoglobulin M (IgM), IgG class and subclass and IgE antibodies. IgG antibody reactivity with crude P. falciparum antigen was detected in all the donors, while many of the children lacked or had low levels of such antibodies against C231. The antibody levels increased significantly with age for both crude P. falciparum antigen and C231, and in the older age groups most of the donors displayed antibodies to C231. This was also true for IgM, IgE and IgG subclass reactivity against C231. Moreover, the ratio of IgG1/IgG2 was considerably lower for C231 than for crude P. falciparum antigen, and in age groups 10–14 and 15–19 years the levels of IgG2 against C231 even exceeded that of IgG1. The IgG2/IgG3 ratios suggest that C231 gives similar levels of IgG2 and IgG3, except for children aged 4–9 years, where IgG3 was higher. Raw IgM, IgG class and subclass and IgE antibody levels to C231 tended to be higher in those who did not experience a malaria attack, but following linear multivariate analysis the trends were not significant.

Publisher

Oxford University Press (OUP)

Subject

Immunology,Immunology and Allergy

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