title: Identification and isolation of a common tumor-associated molecule using monoclonal antibody.
abstract: A monoclonal antibody, 16B-13, derived from the immunization of BALB/c mice with a lung tumor line, immunoprecipitates a common tumor-associated molecule with an apparent mol. wt of 37,000 from lactoperoxidase-iodinated lung carcinoma, colon carcinoma, gastric carcinoma, brest carcinoma, melanoma and lymphoma cells, but not from normal fibroblasts. Analysis by two-dimensional gel electrophoresis of the cell surface-labeled 16B-13 antigen from a colorectal and a melanoma cell line reveals four components with similar mol. wts but with different isoelectric points. The antigen purified from a colorectal carcinoma cell line by immunoaffinity chromatography was shown to be a 37,000 mol. wt polypeptide similar to that obtained by the lactoperoxidase-labeling procedure. However, the purified antigen from the melanoma cell line shows the presence of a 65,000 mol. wt polypeptide and the loss of the 37,000 mol. wt component as detected by Coomassie blue staining and immunoprecipitation.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000951:Antigens, Neoplasm / Q000032:analysis* / Q000302:isolation & purification; D000954:Antigens, Surface / Q000032:analysis* / Q000302:isolation & purification; D001943:Breast Neoplasms / Q000276:immunology; D002460:Cell Line; D004591:Electrophoresis, Polyacrylamide Gel; D005770:Gastrointestinal Neoplasms / Q000276:immunology; D008175:Lung Neoplasms / Q000276:immunology; D008545:Melanoma / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D008970:Molecular Weight; D011233:Precipitin Tests; D011863:Radioimmunoassay
chemical_list: D000911:Antibodies, Monoclonal; D000951:Antigens, Neoplasm; D000954:Antigens, Surface