title: Monoclonal antibody to a human osteogenic sarcoma cell line.
abstract: Monoclonal antibodies against a human osteogenic sarcoma cell line were prepared by production of a somatic cell hybrids between the spleen cells from U-393OS--immunized mice and the mouse myeloma cells SP2/0. From 7 producing and well-growing clones only one--B-0S12--produced antibodies, reactive preferentially with osteosarcoma cells as identified by binding second antibodies and 125I-labeled Protein A. This antibody was tested against a panel of normal and tumor cell targets to determine the pattern of the antigen detected. The monoclonal antibody reacted strongly against U-3930S cells and another human sarcoma in vitro and more weakly against human fibroblasts, peripheral lymphocytes, red blood cells and was negative against mouse fibroblasts. When tested against a panel of unrelated human tumor cell lines, B-0S12 antibody was positive with melanoma cells and negative with cells from bladder, cervix and mammary carcinoma. These cross reactions suggested, that the antibody is reactive with a protein, expressed on different tumor types. This protein is not expressed on the cell surface and is probably associated with cytoskeleton, as revealed by immunofluorescence experiments. Western-blot analysis of a cytoskeletal preparation of U-3930S cells suggests, that B-0S12 antibody recognizes a protein with Mr 55 kD. Further studies are needed to characterize the molecules, carrying the epitope, identified by this monoclonal antibody.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000032:analysis / Q000096:biosynthesis* / Q000276:immunology; D002460:Cell Line; D002478:Cells, Cultured; D005260:Female; D005455:Fluorescent Antibody Technique; D006801:Humans; D006825:Hybridomas / Q000276:immunology; D007114:Immunization; D007118:Immunoassay; D007132:Immunoglobulin Isotypes / Q000032:analysis; D051379:Mice; D008807:Mice, Inbred BALB C; D012516:Osteosarcoma / Q000276:immunology*; D014407:Tumor Cells, Cultured
chemical_list: D000911:Antibodies, Monoclonal; D007132:Immunoglobulin Isotypes