title: Immunogenicity and antigenicity of a Plasmodium falciparum protein fraction (90-110 kDa) able to protect squirrel monkeys against asexual blood stages.
abstract: A monkey vaccination trial using a Plasmodium falciparum protein fraction containing antigens of 90-110 kDa is reported. The fraction was obtained by electroelution from preparative polyacrylamide gels. Three monkeys out of five resisted a heavy challenge dose of highly virulent parasites. Using specific antisera, several components of the fraction were identified, namely heat shock protein 90 (hsp90), Ag44/RhopH3, ABRA, 96tR/GBP130 and Pf96 protease. The fraction did not contain KAHRP, nor the SERP antigen. The antibody response of the monkeys was studied on these individual antigens purified by preparative immunoprecipitation. Surprisingly, hsp90 was found in the immunoprecipitates obtained with SERP antisera. Interestingly, the response to hsp90 correlated with protection, high antibody titres being found only in the protected monkeys. In contrast, no correlation with protection could be found for the response to the other antigens.
authors.affiliation: Unité de Parasitologie Expérimentale, Institut Pasteur, Paris, France.
authors.forename: S
authors.initials: S
authors.lastname: Bonnefoy
authors.forename: J
authors.initials: J
authors.lastname: Gysin
authors.forename: T
authors.initials: T
authors.lastname: Blisnick
authors.forename: M
authors.initials: M
authors.lastname: Guillotte
authors.forename: B
authors.initials: B
authors.lastname: Carcy
authors.forename: L
authors.initials: L
authors.lastname: Pereira da Silva
authors.forename: O
authors.initials: O
authors.lastname: Mercereau-Puijalon
mesh_terms: D000818:Animals; D000913:Antibodies, Protozoan / Q000096:biosynthesis; D015153:Blotting, Western; D004591:Electrophoresis, Polyacrylamide Gel; D004797:Enzyme-Linked Immunosorbent Assay; D006360:Heat-Shock Proteins / Q000276:immunology; D017780:Malaria Vaccines / Q000276:immunology*; D010963:Plasmodium falciparum / Q000276:immunology*; D011233:Precipitin Tests; D015800:Protozoan Proteins / Q000276:immunology* / Q000302:isolation & purification; D012453:Saimiri
chemical_list: D000913:Antibodies, Protozoan; D006360:Heat-Shock Proteins; D017780:Malaria Vaccines; D015800:Protozoan Proteins