title: Leishmania infantum released proteins specifically regulate cytokine expression and production patterns by CD4+ and CD8+ T cells.
abstract: Specific immune responses by CD4+ and CD8+ T cells, from two infected mice strains (BALB/c and C57BL/6), induced by High, Inter and Low protein fractions released by Leishmania infantum, were assessed through the evaluation of IL-12, IFN-gamma and IL-10 mRNA by real-time PCR and respective protein production by ELISA. During infection establishment, High and Inter fractions directed both mice strains T cells subsets to increase the production of IFN-gamma, associated to IL-12 release. Later on, parasite replication augmented in BALB/c and stabilised in C57BL/6 mice. Inter fraction induced CD4+ T cells to maintain IFN-gamma production, with the simultaneous release of IL-12 by both cell subsets in BALB/c mice and by CD8+ T cells in C57BL/6 mice. These observations suggested a prophylactic potential for Inter fraction which was able to induce Th1 response with IL-12 involvement, required for the maintenance of memory cells, in mice strains with different parasitic evolution.
authors.affiliation: Unidade de Leishmanioses and Centro de Malária e Outras Doenças Tropicais, Instituto de Higiene e Medicina Tropical (IHMT), Universidade Nova de Lisboa, Rua da Junqueira 96, 1349-008 Lisboa, Portugal.
authors.forename: Ricardo
authors.initials: R
authors.lastname: Rosa
authors.forename: Cláudia
authors.initials: C
authors.lastname: Marques
authors.forename: Olivia Roos
authors.initials: OR
authors.lastname: Rodrigues
authors.forename: Gabriela M
authors.initials: GM
authors.lastname: Santos-Gomes
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000378:metabolism*; D018414:CD8-Positive T-Lymphocytes / Q000378:metabolism*; D016207:Cytokines / Q000096:biosynthesis* / Q000235:genetics*; D005786:Gene Expression Regulation; D018314:Leishmania infantum / Q000378:metabolism*; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D015800:Protozoan Proteins / Q000378:metabolism*; D013154:Spleen / Q000166:cytology / Q000469:parasitology
chemical_list: D016207:Cytokines; D015800:Protozoan Proteins