title: Immunization with A2 protein results in a mixed Th1/Th2 and a humoral response which protects mice against Leishmania donovani infections.
abstract: The A2 genes of Leishmania donovani encode amastigote-specific A2 proteins, which are considered to be virulence factors required for the survival of this protozoan parasite in the mammalian host. The A2 genes are present within a multigene family and corresponding A2 proteins are composed predominantly of multiple copies of a 10 amino acid repeat sequences. A2-specific antibodies have been detected in the sera of patients suffering from visceral leishmaniasis (VL) and it has been shown that generation of A2 deficient L. donovani resulted in an avirulent phenotype. In this report, we show that immunization of mice with recombinant A2 protein conferred significant protection against challenge infection with L. donovani. The protection correlated with in vitro splenocyte proliferation, production of IFN-gamma in response to A2 protein and the presence of A2-specific antibodies in the sera of immunized mice. These data demonstrate that A2 represents a potential antigen for protection against infection with L. donovani and VL.
authors.affiliation: Department of Microbiology and Immunology, McGill University, 3557 University Street, Que, Montreal, Canada, H3A 2B4.
authors.forename: A
authors.initials: A
authors.lastname: Ghosh
authors.forename: W W
authors.initials: WW
authors.lastname: Zhang
authors.forename: G
authors.initials: G
authors.lastname: Matlashewski
mesh_terms: D019264:Adoptive Transfer; D000818:Animals; D000913:Antibodies, Protozoan / Q000096:biosynthesis* / Q000097:blood / Q000276:immunology; D000953:Antigens, Protozoan / Q000276:immunology*; D015153:Blotting, Western; D004353:Drug Evaluation, Preclinical; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D007371:Interferon-gamma / Q000096:biosynthesis; D007893:Leishmania donovani / Q000276:immunology*; D007898:Leishmaniasis, Visceral / Q000276:immunology / Q000469:parasitology / Q000517:prevention & control*; D008099:Liver / Q000469:parasitology; D008264:Macrophages / Q000469:parasitology; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D015800:Protozoan Proteins / Q000276:immunology*; D016052:Protozoan Vaccines / Q000276:immunology*; D013154:Spleen / Q000276:immunology; D016176:T-Lymphocyte Subsets / Q000276:immunology / Q000637:transplantation; D018417:Th1 Cells / Q000276:immunology*; D018418:Th2 Cells / Q000276:immunology*; D014611:Vaccination
chemical_list: C107645:A2 protein, Leishmania donovani; D000913:Antibodies, Protozoan; D000953:Antigens, Protozoan; D015800:Protozoan Proteins; D016052:Protozoan Vaccines; D007371:Interferon-gamma