title: Studies on circulating antibody against carcinoembryonic antigen (CEA) and CEA-like antigen in cancer patients.
abstract: Characteristics of auto-antibodies for carcinoembryonic antigen (CEA) detected in sera from 3 cancer patients (2 colorectal and 1 breast cancer) were examined. The antibodies belonged to polyclonal immunoglobulin G (IgG). The binding of auto-antibodies with the labeled CEA was inhibited by not only the unlabeled CEA but also NCA-2 (feces and meconium). However, no binding with NCA was observed. Among these auto-antibodies the antibody directed against blood group Lewis determinants which are known to be present in many purified CEA preparations was not found. Previously we had suggested that CEA, NCA-2 and NCA may contain immune determinant in common with alpha 1-acid glycoprotein (AG). These auto-antibodies showed significantly enhanced reactivity for the labeled CEA preparation after purification by anti-AG affinity chromatography in spite of no immunological reaction with AG. These results suggest that auto-antibodies are raised against the common antigenic determinants of both CEA and NCA-2 which do not exist in NCA. These antibodies might be directed to common amino acid sequence shared by CEA and NCA-2, though not excluding the carbohydrate moiety. We surveyed about 500,000 cancer patients but could find only 3 patients who showed a difference in the values of CEA by the indirect and direct method. Thus, the existence of this type auto-antibody to CEA in cancer patients is a rare phenomenon.
authors.forename: Y
authors.initials: Y
authors.lastname: Ura
authors.forename: Y
authors.initials: Y
authors.lastname: Ochi
authors.forename: M
authors.initials: M
authors.lastname: Hamazu
authors.forename: M
authors.initials: M
authors.lastname: Ishida
authors.forename: K
authors.initials: K
authors.lastname: Nakajima
authors.forename: T
authors.initials: T
authors.lastname: Watanabe
mesh_terms: D000368:Aged; D000911:Antibodies, Monoclonal / Q000032:analysis; D000912:Antibodies, Neoplasm / Q000032:analysis*; D000951:Antigens, Neoplasm / Q000276:immunology*; D001323:Autoantibodies / Q000032:analysis*; D001943:Breast Neoplasms / Q000276:immunology*; D002272:Carcinoembryonic Antigen / Q000276:immunology*; D015815:Cell Adhesion Molecules; D003110:Colonic Neoplasms / Q000276:immunology*; D000939:Epitopes / Q000276:immunology; D005260:Female; D006023:Glycoproteins / Q000276:immunology*; D006801:Humans; D007158:Immunologic Techniques; D007983:Lewis Blood Group Antigens / Q000276:immunology; D008113:Liver Neoplasms / Q000276:immunology / Q000556:secondary; D008297:Male; D008875:Middle Aged; D012004:Rectal Neoplasms / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000912:Antibodies, Neoplasm; D000951:Antigens, Neoplasm; D001323:Autoantibodies; D002272:Carcinoembryonic Antigen; D015815:Cell Adhesion Molecules; D000939:Epitopes; D006023:Glycoproteins; D007983:Lewis Blood Group Antigens