title: Observations on the synthesis of carcinoembryonic antigen by an established human colonic carcinoma cell line.
abstract: Some properties and kinetics of synthesis of the carcinoembryonic antigen (CEA-LoVo) produced by an established human colon carcinoma cell line were analyzed. CEA-LoVo was assayed by the method of Chu and Reynoso which was standardized against the activity of the First British Standard for CEA. CEA-LoVo was stable at -20 and 4 degrees C. At 37 degrees C, CEA-LoVo degraded at the rate of 1.4%/day in cell-free supernatants, and at the rate of 6.6%/day in the supernatants of monolayer cultures. CEA-LoVo was sensitive to enzymatic treatment ( approximately 55% loss) and extraction of PCA (greater than 70% loss). The elution profile of CEA-LoVo in concanavalin A-Sepharose B coincided with that of the First British Standard for CEA. No A or B blood group antigenic activity was noted. Studies employing immunofluorescent and horseradish peroxidase-labeled antibody techniques demonstrated heavy membrane and moderate intracytoplasmic localization. The greatest amount of net synthesis occurred for cells in stationary phase while CEA-LoVo release occurred maximally in lag phase.
mesh_terms: D000230:Adenocarcinoma / Q000276:immunology*; D002272:Carcinoembryonic Antigen / Q000032:analysis*; D002455:Cell Division; D002460:Cell Line; D002462:Cell Membrane / Q000276:immunology; D003110:Colonic Neoplasms / Q000276:immunology*; D006801:Humans; D011863:Radioimmunoassay; D013997:Time Factors
chemical_list: D002272:Carcinoembryonic Antigen