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Fucosylated Molecules Competitively Interfere with Cholera Toxin Binding to Host Cells.

Journal article
Authors Amberlyn M Wands
Jakob Cervin
He Huang
Ye Zhang
Gyusaang Youn
Chad A Brautigam
Maria Matson Dzebo
Per Björklund
Ville Wallenius
Danielle K Bright
Clay S Bennett
Pernilla Wittung-Stafshede
Nicole S Sampson
Ulf Yrlid
Jennifer J Kohler
Published in ACS infectious diseases
Volume 4
Issue 5
Pages 758-770
ISSN 2373-8227
Publication year 2018
Published at Institute of Biomedicine, Department of Microbiology and Immunology
Institute of Clinical Sciences, Department of Gastrosurgical Research and Education
Pages 758-770
Language en
Links dx.doi.org/10.1021/acsinfecdis.7b00...
www.ncbi.nlm.nih.gov/entrez/query.f...
Subject categories Immunology in the medical area, Microbiology in the medical area

Abstract

Cholera toxin (CT) enters host intestinal epithelia cells, and its retrograde transport to the cytosol results in the massive loss of fluids and electrolytes associated with severe dehydration. To initiate this intoxication process, the B subunit of CT (CTB) first binds to a cell surface receptor displayed on the apical surface of the intestinal epithelia. While the monosialoganglioside GM1 is widely accepted to be the sole receptor for CT, intestinal epithelial cell lines also utilize fucosylated glycan epitopes on glycoproteins to facilitate cell surface binding and endocytic uptake of the toxin. Further, l-fucose can competively inhibit CTB binding to intestinal epithelia cells. Here, we use competition binding assays with l-fucose analogs to decipher the molecular determinants for l-fucose inhibition of cholera toxin subunit B (CTB) binding. Additionally, we find that mono- and difucosylated oligosaccharides are more potent inhibitors than l-fucose alone, with the LeY tetrasaccharide emerging as the most potent inhibitor of CTB binding to two colonic epithelial cell lines (T84 and Colo205). Finally, a non-natural fucose-containing polymer inhibits CTB binding two orders of magnitude more potently than the LeY glycan when tested against Colo205 cells. This same polymer also inhibits CTB binding to T84 cells and primary human jejunal epithelial cells in a dose-dependent manner. These findings suggest the possibility that polymeric display of fucose might be exploited as a prophylactic or therapeutic approach to block the action of CT toward the human intestinal epithelium.

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