title: DNA-Based immunization with Trypanosoma cruzi complement regulatory protein elicits complement lytic antibodies and confers protection against Trypanosoma cruzi infection.
abstract: A complement regulatory protein (CRP) of Trypanosoma cruzi was evaluated as a vaccine candidate in a murine model of experimental T. cruzi infection. Recombinant CRP derived from an Escherichia coli expression system and a plasmid encoding the full-length crp structural gene under the control of a eukaryotic promoter were used to immunize BALB/c mice. Immunization with both protein and DNA vaccines resulted in a Th1-type T-cell response, comparable antibody titers, and similar immunoglobulin G isotype profiles. Only mice immunized with the crp DNA plasmid produced antibodies capable of lysing the parasites in the presence of complement and were protected against a lethal challenge with T. cruzi trypomastigotes. These results demonstrate the superiority of DNA immunization over protein immunization with the recombinant CRP. The work also supports the further investigation of CRP as a component of a multigene, anti-T. cruzi DNA vaccine.
authors.affiliation: Department of Immunology, Pasteur Institute, Paris 15, France.
authors.forename: P
authors.initials: P
authors.lastname: Sepulveda
authors.forename: M
authors.initials: M
authors.lastname: Hontebeyrie
authors.forename: P
authors.initials: P
authors.lastname: Liegeard
authors.forename: A
authors.initials: A
authors.lastname: Mascilli
authors.forename: K A
authors.initials: KA
authors.lastname: Norris
mesh_terms: D000818:Animals; D000913:Antibodies, Protozoan / Q000097:blood; D014355:Chagas Disease / Q000517:prevention & control*; D003169:Complement Inactivator Proteins / Q000276:immunology*; D016207:Cytokines / Q000096:biosynthesis; D007114:Immunization; D008562:Membrane Glycoproteins / Q000235:genetics / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D015800:Protozoan Proteins / Q000235:genetics / Q000276:immunology*; D016052:Protozoan Vaccines / Q000276:immunology*; D014349:Trypanosoma cruzi / Q000276:immunology*; D019444:Vaccines, DNA / Q000276:immunology*; D014614:Vaccines, Synthetic / Q000276:immunology
chemical_list: D000913:Antibodies, Protozoan; D003169:Complement Inactivator Proteins; D016207:Cytokines; D008562:Membrane Glycoproteins; D015800:Protozoan Proteins; D016052:Protozoan Vaccines; D019444:Vaccines, DNA; D014614:Vaccines, Synthetic; C103951:complement regulatory protein, Trypanosoma cruzi