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Infect Immun. 1992 January; 60(1): 154-158

Protection against malaria in Aotus monkeys immunized with a recombinant blood-stage antigen fused to a universal T-cell epitope: correlation of serum gamma interferon levels with protection.

Department of Microbiology, School of Health, Universidad del Valle, Cali, Colombia.

ABSTRACT

The major surface antigen p190 of the human malaria parasite Plasmodium falciparum contains nonpolymorphic, immunogenic stretches of amino acids which are attractive components for a subunit vaccine against malaria. One such polypeptide, termed 190L, is contained in the 80-kDa processing product of p190, which constitutes the major coat component of mature merozoites. We report here that immunization of Aotus monkeys with 190L gives only poor protection against P. falciparum challenge. However, addition by genetic engineering of a universal T-cell epitope (CS.T3) to 190L improved immunity, and as a result three of four monkeys were protected following challenge infection with blood-stage parasites. Neither antibody against the immunizing antigens or against blood-stage parasites nor the capacity of the monkeys' sera to inhibit in vitro parasite invasion correlated with protection. However, in contrast to sera from nonprotected monkeys, sera from protected animals contained elevated levels of gamma interferon. These results suggest that gamma interferon is directly or indirectly involved in the process of asexual parasite control in vivo.

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