Isolation and characterization of rat carcinoembryonic antigen.
A rat tumor-associated antigen with properties similar to those of human carcinoembryonic antigen (CEA) has been detected with rabbit immune sera in extracts of transplantable rat colonic adenocarcinoma, RCA-1. This antigen, termed rat CEA, was also detectable by a monkey antihuman CEA serum and a rat monoclonal antibody to rat CEA. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis of perchloric acid extracts of RCA-1 tumor, followed by immunoblotting with the above-mentioned anti-CEA reagents, revealed that rat CEA activity resided in components with a molecular weight of approximately 350 kD. The glycoprotein nature of these components was indicated by positive staining with periodic acid-Schiff. Sephadex G-200 chromatography, as well as Sepharose 4B chromatography with and without sodium dodecyl sulfate indicated that the 350-kD components existed in the extracts as molecular aggregates. The 350-kD material, which had been purified by an affinity column containing rat monoclonal antibodies to rat CEA, reacted with the rabbit and monkey anti-CEA sera. This provided strong evidence that serological activity of rat CEA was confined to the 350-kD components.
Kim
J G
JG
Department of Microbiology, School of Medicine, State University of New York, Buffalo.
Abeyounis
C J
CJ
D000818:Animals; D002272:Carcinoembryonic Antigen / Q000276:immunology / Q000302:isolation & purification*; D003110:Colonic Neoplasms / Q000276:immunology; D015151:Immunoblotting; D008970:Molecular Weight; D051381:Rats; D011916:Rats, Inbred F344
D002272:Carcinoembryonic Antigen