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Infection and Immunity, January 2004, p. 284-294, Vol. 72, No. 1
0019-9567/04/$08.00+0 DOI: 10.1128/IAI.72.1.284-294.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.
Clarisse Yone,1,
Anne E. Tebo,1,
Jan van Aaken,1,2,
Bertrand Lell,1,2 Peter G. Kremsner,1,2 and Adrian J. F. Luty1,2*
Department of Parasitology, Institute for Tropical Medicine, University of Tübingen, D-72074 Tübingen, Germany,1 Medical Research Unit, Albert Schweitzer Hospital, Lambaréné, Gabon2
Received 4 August 2003/ Returned for modification 29 September 2003/ Accepted 8 October 2003
We assessed immunoglobulin G (IgG) isotype responses with specificity for the variant surface antigens (VSA) of heterologous Plasmodium falciparum isolates by using flow cytometry and plasma from healthy Gabonese adults and from children during and after two consecutive malaria episodes. The individual isolate-specific antibody profiles differed markedly in terms of their isotype content but were similar for healthy adults and healthy uninfected children. In healthy adults, IgG3 and IgG2 responses were the highest, while in healthy children, IgG3 and IgG4 predominated. A transiently elevated IgG1 response was observed during the second of two successive malaria episodes in children, signaling P. falciparum infection-induced cross-reactive anti-VSA responses. Our findings highlight the prominence of IgG3 in the overall profile of these responses but also indicate a marked age-related increase in the prevalence of anti-VSA antibodies of the classically noncytophilic IgG2 isotype, possibly reflecting the high frequency of the histidine-131 variant of Fc
RIIA in the Gabonese population.
G.C. and C.Y. contributed equally to this work.
Present address: Dept. of Microbiology, University of Alabama at Birmingham, Birmingham, AL 35294-2170.
Present address: Via Pratocarasso 45, 6500 Bellinzona, Switzerland.
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