title: Expression of tumor-associated surface membrane antigens on marrow CFU-s, CFC-gm, BFU-e, and brain CFU-s.
abstract: Antiserum raised against a mouse mast cell line (FMP1) reacts with 90% to 100% of spleen colony-forming units (CFU-s), granulocyte/macrophage colony-forming cells (CFC-gm), erythroid burst-forming units (BFU-e), and 15% of nucleated marrow cells, using a complement-dependent cytotoxicity assay. We demonstrated that bone marrow, spleen, or thymus cells are able to absorb this activity from the antiserum. Although mouse brain cells have low reactivity with anti-FMP1 serum, the cytolysis level was reduced to background when antiserum was absorbed with brain cells. In addition, colony formation by marrow CFU-s, CFC-gm, and BFU-e was no longer prevented when the cells were incubated with brain-absorbed anti-FMP1 serum and complement. These findings suggest the presence of brain-associated antigens on CFU-s, CFC-gm, and BFU-e. To test whether a CFU-s accessory cell population in marrow is affected by treatment with anti-FMP1 serum and complement, antibody-treated marrow cells were mixed with large numbers of thymocytes and injected into recipient mice. Colony formation was not altered, indicating that the antiserum reacted directly with antigens on CFU-s and not on CFU-s accessory cells.
mesh_terms: D000818:Animals; D000912:Antibodies, Neoplasm; D000938:Antigen-Presenting Cells / Q000276:immunology; D000951:Antigens, Neoplasm; D000954:Antigens, Surface; D001853:Bone Marrow / Q000276:immunology; D001921:Brain / Q000276:immunology*; D002999:Clone Cells / Q000276:immunology; D006412:Hematopoietic Stem Cells / Q000276:immunology*; D051379:Mice; D013154:Spleen / Q000276:immunology; D013950:Thymus Gland / Q000276:immunology
chemical_list: D000912:Antibodies, Neoplasm; D000951:Antigens, Neoplasm; D000954:Antigens, Surface