title: Radioactive labeling of antibody: a simple and efficient method.
abstract: A simple and efficient method of covalently coupling the strong chelator diethylenetriaminepentaacetic acid to proteins was developed for radiolabeling immunoglobulin G antibodies. After being coupled and labeled with indium-111, a monoclonal antibody to carcinoembryonic antigen retained its ability to bind to its antigen in vitro and in vivo. In nude mice with a human colorectal xenograft, 41 percent of the injected radioactivity became localized in each gram of xenograft at 24 hours compared with 9 percent for control antibody and 19 percent for radioiodinated antibody to carcinoembryonic antigen.
mesh_terms: D000818:Animals; D000906:Antibodies; D000911:Antibodies, Monoclonal / Q000276:immunology; D002272:Carcinoembryonic Antigen / Q000276:immunology; D002851:Chromatography, High Pressure Liquid; D006801:Humans; D007074:Immunoglobulin G / Q000276:immunology; D007553:Isotope Labeling / Q000379:methods*; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D004369:Pentetic Acid
chemical_list: D000906:Antibodies; D000911:Antibodies, Monoclonal; D002272:Carcinoembryonic Antigen; D007074:Immunoglobulin G; D004369:Pentetic Acid