title: Monoclonal rat antibodies to rat carcinoembryonic antigen.
abstract: An IgM-class rat monoclonal antibody, designated 5B1, was produced against rat carcinoembryonic antigen. This antibody, which can be considered an autoantibody, formed a single precipitation line in a gel diffusion test with an extract of the CEA-positive rat colonic adenocarcinoma, RCA-1. This line gave a reaction of complete identity with a line formed by a rabbit antiserum specific for rat CEA. 5B1 also bound to extracts of the RCA-1 tumor in EIA, but did not bind at all to extracts of the CEA-negative rat colonic adenocarcinoma, RCA-2, nor to extracts of normal rat tissues including liver, kidney and intestine. Inhibition tests showed that the activity of the monoclonal antibody in EIA was abolished by extracts of RCA-1 tumor, but was hardly affected by extracts of the other tissues.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D002272:Carcinoembryonic Antigen / Q000276:immunology*; D005779:Immunodiffusion; D007124:Immunoenzyme Techniques; D007075:Immunoglobulin M; D009374:Neoplasms, Experimental / Q000276:immunology; D051381:Rats
chemical_list: D000911:Antibodies, Monoclonal; D002272:Carcinoembryonic Antigen; D007075:Immunoglobulin M