title: Hybridoma antibodies reactive with human bladder carcinoma cell surface antigens.
abstract: Hybridoma antibodies to the human bladder cancer cell line RT4 were prepared by fusing spleen cells from RT4-immunized BALB/c mice with the murine plasmacytoma line NS-1. When antibodies were characterized by direct serological testing, antibody A2 exhibited highly restricted specificity for an antigen found only on RT4. However, further analysis with absorption, a standard serologic technique that has not been widely applied to hybridoma antibodies because of their monoclonal nature, revealed that the antigen could also be found on 1 other bladder cancer cell line, 5637, and on the human cervical carcinoma line ME-180. Quantitative absorption assays suggest that this phenomenon of absorption-positive, direct test-negative cells may be related to the amount of antigen present on the cell surface. Another antibody, A80, detected an antigen with broader distribution. Both antibodies described heat-labile, trypsin-resistant antigens present on a restricted range of cells. The role of these antibodies in identifying subsets of malignant urothelial cells is being investigated.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000096:biosynthesis / Q000276:immunology*; D000918:Antibody Specificity; D000937:Antigen-Antibody Reactions; D000951:Antigens, Neoplasm / Q000032:analysis / Q000276:immunology*; D000954:Antigens, Surface / Q000032:analysis / Q000276:immunology*; D002460:Cell Line; D006382:Hemadsorption; D006801:Humans; D007680:Kidney Neoplasms / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D001749:Urinary Bladder Neoplasms / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000951:Antigens, Neoplasm; D000954:Antigens, Surface