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• W1590788894 startingPage "19248" @default.
• W1590788894 abstract "Cl.16E, a stably differentiated clonal derivative of the human colonic cancer cell line HT29, was used to investigate the structure of oligosaccharide chains of mucins in colonic cancer. Secretory mucins were purified by equilibrium density gradient centrifugation in CsCl. Oligosaccharide side chains were isolated after beta-elimination. Compositional analysis of oligosaccharide-alditols performed after purification by gel filtration on a Bio-gel P-6 column showed 1) that GalNAc residues were located exclusively at the reducing ends of the chains, and 2) that fucose was absent from the preparation. Oligosaccharide-alditols were separated by high performance liquid chromatography (HPLC) on quaternary amine packings into a minor neutral fraction representing about 6.5% by weight of released oligosaccharides and four acidic fractions. Two acidic fractions, namely FI and FII encompassing mono- and disialylated structures, respectively, and containing 78% of total oligosaccharide alditols, were separated by HPLC. Structural determinations were carried out using methylation analysis, 1H NMR spectroscopy, and fast atom bombardment-mass spectrometry. Twelve oligosaccharide structures were determined which ranged in size from 3 to 8 residues. These oligosaccharides were based on core types 1, 2, and 4. Elongation of oligosaccharide chains was terminated by addition of sialic acid in alpha 2-3 linkage to Gal beta 1-3R and to Gal beta 1-4R residues. The predominant structure was a hexasaccharide (fraction FII-4). This contrasts with normal colonic mucins whose oligosaccharides were previously found to be based on core 3 structures and carry sialic acids in alpha (2-6) linkage to Gal beta 1-3R, to Gal beta 1-4R, and to GalNAc alpha-R (Podolsky, D.K. (1985) J. Biol. Chem. 260, 8262-8271; Podolsky, D.K. (1985) J. Biol. Chem. 260, 15510-15515). Collectively our findings suggest that Cl.16E colon cancer cells are able to synthesize mucin oligosaccharides of gastric type whose elongation is truncated by premature sialylation." @default.
• W1590788894 created "2016-06-24" @default.
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• W1590788894 date "1992-09-01" @default.
• W1590788894 modified "2023-09-29" @default.
• W1590788894 title "Oligosaccharide structures of mucins secreted by the human colonic cancer cell line CL.16E." @default.
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• W1590788894 doi "https://doi.org/10.1016/s0021-9258(18)41768-1" @default.
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