title: Detection of 4-O-acetyl-N-glycolylneuraminyl lactosylceramide as one of tumor-associated antigens in human colon cancer tissues by specific antibody.
abstract: Antibody to 4-O-acetyl-N-glycolylneuraminyl lactosylceramide [GM3(Neu4AcGc)] was prepared by immunizing chicken with the glycosphingolipid antigen. The specific antibody was purified by affinity chromatography columns of Octyl-Sepharose linked to the homologous immunogen and its deacetylated analogue [N-glycolylneuraminyl lactosylceramide, GM3(NeuGc)], respectively. The specificity of the purified antibody was confirmed by enzyme-linked immunosorbent assay (ELISA) and inhibition of equine erythrocyte hemagglutination using authentic glycosphingolipids as antigens. The results indicated that the antibody recognized both 4-O-acetyl and N-glycolyl groups of terminal sialic acid residue as the immunodeterminants. The purified specific antibody was applied in the confirmation of the presence of GM3(Neu4AcGc) in ganglioside fractions of human colon cancer tissues, which were suspected to have this antigen by studies of alkaline, periodate or neuraminidase treatment [Higashi et al. (1985) Cancer Res. 45, 3796-3802.], by thin-layer chromatography (TLC)-immunostaining technique.
mesh_terms: D000912:Antibodies, Neoplasm / Q000096:biosynthesis; D000918:Antibody Specificity; D000951:Antigens, Neoplasm / Q000032:analysis* / Q000276:immunology*; D003110:Colonic Neoplasms / Q000276:immunology*; D005679:G(M3) Ganglioside / Q000031:analogs & derivatives* / Q000276:immunology; D005732:Gangliosides / Q000276:immunology; D006801:Humans; D007106:Immune Sera / Q000276:immunology; D005779:Immunodiffusion; D007124:Immunoenzyme Techniques
chemical_list: D000912:Antibodies, Neoplasm; D000951:Antigens, Neoplasm; D005679:G(M3) Ganglioside; D005732:Gangliosides; D007106:Immune Sera; C049665:4-O-acetyl-N-glycolylneuraminyl lactosylceramide