title: Mass spectrometry of a human tumor glycolipid antigen being defined by mouse monoclonal antibody NS-19-9.
abstract: With an antibody-to-chromatogram binding assay to follow the preparation a glycolipid was isolated from human pancreatic carcinoma using a mouse monoclonal antibody of apparent specificity for gastrointestinal tumors. Direct probe mass spectrometry of three derivatives established the sugar sequence as NeuAc-hexose-(fucose)N-acetylhexosamine-hexose-hexose and the ceramide to be composed mainly of phytosphingosine and 16-24 carbon 2-hydroxy fatty acids. NMR spectroscopy of two of the derivatives made likely the presence of the sequence Gal beta 1 leads to 3GlcNAc(4 comes from 1 alpha Fuc)beta 1 leads to, which is the blood group Lewis a determinant. This is in agreement with recent results from degradation studies.
mesh_terms: D000230:Adenocarcinoma / Q000276:immunology; D000818:Animals; D000911:Antibodies, Monoclonal; D000951:Antigens, Neoplasm / Q000302:isolation & purification*; D002240:Carbohydrate Sequence; D003110:Colonic Neoplasms / Q000276:immunology; D000939:Epitopes; D006017:Glycolipids / Q000302:isolation & purification*; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D051379:Mice; D010190:Pancreatic Neoplasms / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000951:Antigens, Neoplasm; D000939:Epitopes; D006017:Glycolipids