title: Stimulation of thymus- and bone marrow-derived lymphocytes by tumor cells in culture.
abstract: In vitro lymphocyte stimulation by mitomycin-blocked tumor cells can be used to measure tumor-specific immune responses. In order to determine the responding cell type(s) in this reaction, lymph node and spleen cell populations were specifically depleted of thymus- or bone marrow-derived cells by the use of the appropriate antisera and complement or by immunoadsorption of the Fc receptor-bearing cells to antibody-coated sheep red blood cell monolayers. The compositions of both the original and the modified lymphocyte populations were determined by (a) viability counting following treatment with antisera and complement, (b) direct and indirect immunofluorescence, (c) antibody-coated erythrocyte rosette formation, and (d) response to thymus- and bone marrow-derived cell mitogens. In the lymph node cell populations, only the thymus-derived cells were stimulated by the tumor cells. However, both bone marrow- and thymus-derived cells from tumor-immune spleens underwent stimulation when exposed to tumor cells in culture.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology*; D002469:Cell Separation; D002478:Cells, Cultured; D005354:Fibrosarcoma / Q000276:immunology*; D007109:Immunity; D007141:Immunoglobulin Fc Fragments; D007163:Immunosorbent Techniques; D008198:Lymph Nodes / Q000276:immunology; D008213:Lymphocyte Activation; D051379:Mice; D008809:Mice, Inbred C3H; D008937:Mitomycins / Q000494:pharmacology; D011947:Receptors, Antigen, B-Cell; D012513:Sarcoma, Experimental / Q000276:immunology*; D013154:Spleen / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D007141:Immunoglobulin Fc Fragments; D008937:Mitomycins; D011947:Receptors, Antigen, B-Cell