Abstract
Rabbits were immunized with the synthetic peptide EENVEHDA or (EENV)2, corresponding to a tandemly repeated sequence in the C-terminal part of the Plasmodium falciparum antigen Pf155/RESA, or with Escherichia coli-derived fusion proteins containing the corresponding repeats. For all sera, the capacity of the total immunoglobulin G fractions to inhibit P. falciparum merozoite invasion in vitro was similar and relatively low. Affinity purification of Pf155/RESA-specific antibodies on parasite-infected erythrocyte monolayers or on peptide columns increased the inhibitory capacity 50 to 5,000 times, whereas the immunofluorescence titers were increased only 10 times. The addition of small amounts of total immunoglobulin G to the affinity-purified antibodies gave a marked and dose-dependent reduction of the inhibitory capacity of the purified antibodies. However, this reduction was only seen in combinations where the immunoglobulin G fraction was from the same serum as the affinity-purified antibodies, suggesting that it was mediated by anti-idiotypic antibodies reacting with non-cross-reacting idiotopes of the invasion-inhibiting antibodies.
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