TY - JOUR
T1 - Glycolipid Composition of Human Cataractous Lenses
T2 - Characterization of Lewisx Glycolipids
AU - Ariga, Toshio
AU - Tao, Robert V.
AU - Lee, Bee Chen
AU - Yamawaki, Masanaga
AU - Yoshino, Hiide
AU - Scarsdale, Neel J.
AU - Kasama, Takeshi
AU - Kushi, Yasunori
AU - Yu, Robert K.
N1 - Copyright:
Copyright 2004 Elsevier B.V., All rights reserved.
PY - 1994/1/28
Y1 - 1994/1/28
N2 - We have studied the glycolipid composition of human cataractous lenses. Neutral and acidic lipid fractions were isolated by column chromatographies on DEAE-Sephadex and Iatrobeads. The neutral glycolipid fraction and acidic glycolipid fraction contained 0.6-0.9 μg of lipid-bound glucose (Glc) per mg of protein and 0.8-1.3 μg of lipid-bound sialic acid (NeuAc) per mg of protein, respectively. The neutral glycolipid fraction was found to contain LacCer (39.0% of total neutral glycolipids), Gb3 (16.2%), Gb4 (1.1%), nLc4 (5.0%), X (29.0%), and Y (9.2%). The acidic lipid fraction was found to contain mainly GM3 (33.1% of the total ganglioside fraction), GM1 (8.3%), LM1 (7.3%), GD1a (16.0%), and G (30.1%). The structures of neutral glycolipids X and Y and ganglioside G were elucidated by high performance thin-layer chromatography overlay method of glycolipids, gas-liquid chromatography, proton NMR spectrometry, and liquid secondary ion mass spectrometry as follows: 1) X, Galβ1-4(Fucα1-3)GlcNAcβ1-3Galβ1-4Glcβ1-1′Cer, III3FucnLc4 (Lex); 2) Y, Galβ1-4(Fucα1-3)GlcNAcßl-3Galßl-4(Fucal-3)GlcNAcβ1- 3Galβ1-4Glcβ1-1′Cer, V3FucIII3FucnLc6; and 3) G, NeuAcα2-3Galβ1-4(Fucα1-3)GlcNAcβ1-3Gal-β1- 4Glcβ1-1′Cer, IV3NeuAcIII3FucnLc4 (sialosyl-Lex). A minor neutral glycolipid Z was isolated and tentatively characterized as GlcNAcβ1-3?Galβ1-4(Fucα1-3)GlcNAcβ1-3Galβ1- 4Glcβ1-1′Cer (GlcNAc-Lex), suggesting that it may be the precursor of glycolipid Y. The major long-chain base of these human cataract glycolipids was C18:0 sphingosine (sphinganine). The major fatty acids were C16:0, C24:1 and C24:0, and monounsaturated fatty acids accounted for 40-55% of the total fatty acids.
AB - We have studied the glycolipid composition of human cataractous lenses. Neutral and acidic lipid fractions were isolated by column chromatographies on DEAE-Sephadex and Iatrobeads. The neutral glycolipid fraction and acidic glycolipid fraction contained 0.6-0.9 μg of lipid-bound glucose (Glc) per mg of protein and 0.8-1.3 μg of lipid-bound sialic acid (NeuAc) per mg of protein, respectively. The neutral glycolipid fraction was found to contain LacCer (39.0% of total neutral glycolipids), Gb3 (16.2%), Gb4 (1.1%), nLc4 (5.0%), X (29.0%), and Y (9.2%). The acidic lipid fraction was found to contain mainly GM3 (33.1% of the total ganglioside fraction), GM1 (8.3%), LM1 (7.3%), GD1a (16.0%), and G (30.1%). The structures of neutral glycolipids X and Y and ganglioside G were elucidated by high performance thin-layer chromatography overlay method of glycolipids, gas-liquid chromatography, proton NMR spectrometry, and liquid secondary ion mass spectrometry as follows: 1) X, Galβ1-4(Fucα1-3)GlcNAcβ1-3Galβ1-4Glcβ1-1′Cer, III3FucnLc4 (Lex); 2) Y, Galβ1-4(Fucα1-3)GlcNAcßl-3Galßl-4(Fucal-3)GlcNAcβ1- 3Galβ1-4Glcβ1-1′Cer, V3FucIII3FucnLc6; and 3) G, NeuAcα2-3Galβ1-4(Fucα1-3)GlcNAcβ1-3Gal-β1- 4Glcβ1-1′Cer, IV3NeuAcIII3FucnLc4 (sialosyl-Lex). A minor neutral glycolipid Z was isolated and tentatively characterized as GlcNAcβ1-3?Galβ1-4(Fucα1-3)GlcNAcβ1-3Galβ1- 4Glcβ1-1′Cer (GlcNAc-Lex), suggesting that it may be the precursor of glycolipid Y. The major long-chain base of these human cataract glycolipids was C18:0 sphingosine (sphinganine). The major fatty acids were C16:0, C24:1 and C24:0, and monounsaturated fatty acids accounted for 40-55% of the total fatty acids.
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M3 - Article
C2 - 7905480
AN - SCOPUS:0027993922
SN - 0021-9258
VL - 269
SP - 2667
EP - 2675
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
IS - 4
ER -