作者:Arun K Sarkar、Jillian R Brown、Jeffrey D Esko
DOI:10.1016/s0008-6215(00)00200-7
日期:2000.11
Five disaccharides related in structure to the glycans of vertebrate mucins have been chemically synthesized using orthogonal blocking, coupling and deblocking techniques. These include 2-naphthylmethyl 3,4,6-tetra-O-acetyl-beta -D-galactopyranosyl-(1 --> 4)-2-acetamido-3,6-di-O-acetyl-2-deoxy-beta -D-glucopyranoside (6), 2-naphthylmethyl 2-acetamido-3,4,6-tri-O -acetyl-2-deoxy-beta -D-glucopyranosyl-(1 --> 3)-2,4,6-tri-O -acetyl-beta -D-galactopyranoside (14), 2-naphthylmethy12,3,4,6-tetra-O-acetyl-beta -D-galactopyranosyl-(1 --> 3)-2-acetamido-4,6-di-O-acetyl-2-deoxy-alpha -D-galactopyranoside oside (20), 2-naphthylmethyl 2-acetamido-3,4,6-tri-O-acetyl-2-deoxy-beta -D-glucopyranosyl-(1 --> 3)-2-acetamido-4, 6-di-O -acetyl-2-deoxy-or-D-galactopyranoside (23) and 2-naphthylmethyl 2-acetamido-3,4, 6-tri-O-acetyl-2-deoxy-beta -D-glucopyranosyl-(1 --> 6)-2-acetamido-3,4-di-O-acetyl-2-deoxy-alpha -D-galactopyranoside (27). These per-O-acetylated compounds were fed to U-937 cells to test their ability to prime oligosaccharide synthesis, inhibit glycoprotein biosynthesis and alter adhesion to E-selectin expressed on endothelial cells. The results show that 6, 14, and 20 served as substrates for oligosaccharide synthesis. The generation of glycoside-primed glycans altered the formation of glycoproteins on the cell surface and inhibited cell adhesion dependent on E-selectin. (C) 2000 Elsevier Science Ltd. All rights reserved.