title: The xenogeneic effect. III. Induction of cell-mediated cytotoxicity by alloantigen-stimulated thymocytes in the presence of xenogeneic reconstitution factor.
abstract: A supernatant from human mixed leukocyte cultures (MLC), Xenogeneic Reconstitution Factor (XRF), was added to one-way murine MLC. This supernatant greatly enhances the generation of cytotoxic cells from C57BL/6 or DBA/2 responder thymocytes, as assayed by a standard 51Cr-release assay. This enhancement is shown 1) to be dependent upon the presence of BDF1 semi-allogeneic stimulator cells and 2) to result in the generation of cytotoxic cells that are specific for the H-2 type of the stimulating alloantigen. In some experiments, alloantigen-stimulated murine spleen cells, when cultured with XRF showed increased induction of cell-mediated cytotoxicity. These experiments show that XRF contains a cytotoxic-cell activating factor(s) that is functionally similar to those found in murine-derived supernatants, and that this factor can participate in the generation of cytotoxic cells from precursors present in the murine thymus.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D003601:Cytotoxicity Tests, Immunologic; D000939:Epitopes; D005260:Female; D007111:Immunity, Cellular; D066298:In Vitro Techniques; D007519:Isoantigens; D008213:Lymphocyte Activation; D007959:Lymphocyte Culture Test, Mixed; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D013045:Species Specificity; D013154:Spleen / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000939:Epitopes; D007519:Isoantigens