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. 1994 Jun;62(6):2354–2361. doi: 10.1128/iai.62.6.2354-2361.1994

Serum antibody immunoglobulin G of mice convalescent from Plasmodium yoelii infection inhibits growth of Plasmodium falciparum in vitro: blood stage antigens of P. falciparum involved in interspecies cross-reactive inhibition of parasite growth.

P Ray 1, N Sahoo 1, B Singh 1, F A Kironde 1
PMCID: PMC186518  PMID: 8188358

Abstract

We demonstrated that antibodies in the serum of BALB/c mice convalescent from Plasmodium yoelii infection inhibit the in vitro growth of Plasmodium falciparum. Blood stage P. falciparum antigens that cross-react with the convalescent-phase mouse serum antibodies were identified and partially characterized. Convalescent-phase mouse serum immunoglobulin G (IgG) reacted with P. falciparum lysates at up to a 1:15,000 dilution of the immune sera and bound to P. falciparum-parasitized erythrocytes at up to a 1:5,000 dilution of the sera. The cross-reactive moieties of antigens in parasite lysates were resistant to oxidation by periodate but sensitive to trypsinization. About 15 polypeptides (M(r)s of 15,000 to 110,000) of P. falciparum blood stages were recognized by the convalescent-phase mouse anti-P. yoelii sera; many of these antigens were metabolically 35S labeled and specifically immunoprecipitated. Also, virtually all of the cross-reactive antigens were recognized by human malaria-immune sera. The anti-P. yoelii serum antibodies bound, with high affinity, to at least five of the cross-reactive antigens (M(r)s of 107,000, 84,000, 53,000, 36,000, and 30,000). By phase separation in Triton X-114, eight interspecies cross-reactive antigens (M(r)s of 84,000, 76,000, 51,000, 31,000, 29,000, 28,000, 23,000, and 22,000) were found to be integral membrane proteins. Convalescent-phase mouse serum IgG strongly inhibited the differentiation of P. falciparum from schizonts to rings; 75 micrograms of IgG per ml caused 80% inhibition of release of merozoites and their invasion into erythrocytes. On the other hand, the anti-P. yoelii serum antibodies also inhibited intracellular development of P. falciparum from rings to schizonts; 25 micrograms of IgG per ml caused 50% inhibition. Inhibition of P. falciparum growth by anti-P. yoelii serum IgG suggests that some of the interspecies cross-reactive antigens contain important conserved epitopes and induce protective antibodies against P. falciparum.

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