title: Dependence on macrophages of the guinea pig T-cell immune response to Herpetomonas samuelpessoai.
abstract: The specific in vitro activation of guinea pig T-lymphocytes by Herpetomonas samuelpessoai and its dependence upon macrophages was studied. Peritoneal exudate T-cells from guinea pigs sensitized against intact H. samuelpessoai organisms were activated specifically in vitro as measured by 3H thymidine incorporation. These same T-cells also were activated by Trypanosoma cruzi extracts, indicating cross reactivity at the cellular level between the two protozoan antigens. The T-cell specific response was found to be dependent on adherent cells. Moreover, macrophages that had been "pulsed" in vitro with H. samuelpessoai organisms were able to induce the specific T-cell activation.
mesh_terms: D000818:Animals; D056890:Eukaryota / Q000276:immunology*; D006168:Guinea Pigs; D007114:Immunization; D008213:Lymphocyte Activation; D008264:Macrophages / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*