title: A monoclonal antibody against a CEA-related antigen expressed on HT29 colon tumour cells.
abstract: A new monoclonal antibody, that binds to CEA and with low cross-reactivity with NCA, has been raised to an antigen expressed on HT29 colon tumour cells. This antibody (H58) reacts strongly with high-molecular-weight protein (50 X 10(4)) isolated from a crude plasma membrane preparation of HT29 cells as well as binding to purified CEA of molecular size (20 X 10(4)) isolated both from those cells and liver metastases of colon tumour. H58 binds to an epitope sterically unrelated to the binding site of the previously described anti-CEA monoclonal antibody MA/1 and our routine anti-CEA polyclonal serum PKIG. Augmented binding of antibody to either the cell membrane preparation or conventional CEA can be achieved using a mixture comprising equal weights of specific immunoglobulin from H58 and MA/1. The value of solid-phase binding assays using microtitre plates for selecting potentially useful antibodies is discussed.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology* / Q000302:isolation & purification; D000912:Antibodies, Neoplasm / Q000276:immunology / Q000302:isolation & purification; D000937:Antigen-Antibody Reactions; D000951:Antigens, Neoplasm / Q000276:immunology; D001667:Binding, Competitive; D002272:Carcinoembryonic Antigen / Q000276:immunology*; D002460:Cell Line; D003110:Colonic Neoplasms / Q000276:immunology*; D000939:Epitopes / Q000276:immunology; D006801:Humans; D006824:Hybridization, Genetic; D051379:Mice; D008807:Mice, Inbred BALB C; D008970:Molecular Weight
chemical_list: D000911:Antibodies, Monoclonal; D000912:Antibodies, Neoplasm; D000951:Antigens, Neoplasm; D002272:Carcinoembryonic Antigen; D000939:Epitopes