title: A monoclonal antibody specific for the Thomsen-Friedenreich cryptic T antigen.
abstract: A monoclonal antibody (49H.24) is described that was made after immunization of BALB/c mice with human neuraminidase-treated erythrocytes (NE-RBC). 49H.24 is an IgM and reacts with NE-RBC but not untreated, normal human RBC. As little as 100 pg of antibody protein produced detectable direct agglutination of, or binding to, NE-RBC. The fine specificity of 49H.24 was determined by using a series of synthetic sugar haptens as inhibitors of agglutination or binding of 49H.24 to NE-RBC. Only synthetic T hapten (beta Gal(1 leads to 3)alpha GalNAc) produced complete inhibition of agglutination or binding, and no inhibition was produced by several other closely related haptens. Synthetic T hapten-coated silica beads (Synsorb) were used to affinity purify 49H.24. Affinity-purified antibody was radiolabeled with 125I and used in a sensitive competition assay to detect natural T antigen associated with cell membranes or in soluble form. The potential use of this or similar monoclonal antibodies as probes for an important human tumor marker is discussed.
mesh_terms: D000818:Animals; D000906:Antibodies / Q000276:immunology; D000911:Antibodies, Monoclonal / Q000096:biosynthesis* / Q000276:immunology; D000917:Antibody Formation; D015295:Antigens, Tumor-Associated, Carbohydrate; D001666:Binding Sites, Antibody; D001667:Binding, Competitive; D004187:Disaccharides / Q000096:biosynthesis* / Q000276:immunology; D004797:Enzyme-Linked Immunosorbent Assay; D000939:Epitopes; D005260:Female; D006386:Hemagglutination Tests; D006801:Humans; D006825:Hybridomas / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D009439:Neuraminidase / Q000494:pharmacology
chemical_list: D000906:Antibodies; D000911:Antibodies, Monoclonal; D015295:Antigens, Tumor-Associated, Carbohydrate; D004187:Disaccharides; D000939:Epitopes; C016467:Thomsen-Friedenreich antigen; C025991:Thomsen-Friedenreich antibodies; D009439:Neuraminidase