title: Requirements for stimulation of T cell responses against virus-infected cells: nature of ectromelia virus-infected cells capable of stimulating cytotoxic T cells in a secondary response in vitro.
abstract: The nature of infected stimulator cells in the in vitro secondary cytotoxic T cell response to ectromelia infection was investigated. It was found that macrophages were better stimulator cells than spleen cells. B cells (Ig-positive cells) were superior to T cells (Ig-negative cells) both on a relative proportion and on a cell-to-cell basis. Concanavalin A and lipopolysaccharide-stimulated lymphocytes were also effective stimulator cells but appeared to be slightly inferior to spleen cells. Spleen cells depleted of Ia-positive cells were markedly inferior to normal spleen cells as stimulators. It was also found that primary and secondary cytotoxic T cells were largely Ia-negative. These findings are discussed in relation to the likely events during T cell responses to infection in vivo.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology; D003602:Cytotoxicity, Immunologic; D004482:Ectromelia, Infectious / Q000276:immunology*; D007111:Immunity, Cellular; D007156:Immunologic Memory; D066298:In Vitro Techniques; D007519:Isoantigens; D008213:Lymphocyte Activation; D008264:Macrophages / Q000276:immunology; D051379:Mice; D011213:Poxviridae Infections / Q000276:immunology*; D011947:Receptors, Antigen, B-Cell / Q000032:analysis; D013154:Spleen / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D007519:Isoantigens; D011947:Receptors, Antigen, B-Cell