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Infect Immun. 1978 October; 22(1): 247-254
Copyright © 1978 American Society for Microbiology. All Rights Reserved.

Mannose Binding and Epithelial Cell Adherence of Escherichia coli

¹ Veterans Administration Hospital and the Departments of Microbiology and Medicine, University of Tennessee Center for the Health Sciences, Memphis, Tennessee 38104

ABSTRACT

The mannose-binding activity of several isolates of Escherichia coli was monitored by aggregometry with mannan-containing yeast cells. The velocity of yeast cell aggregation was found to correlate with the ability of the organisms to adhere to human epithelial cells. Mannose or its derivatives specifically inhibited or reversed epithelial cell adherence and yeast cell aggregation. Most of the adherent bacteria could be displaced within 30 min from the epithelial cells with methyl -D-mannopyranoside, but not with other sugars tested. Cultures of E. coli were fractionated into nonadherent and adherent populations by adsorption with epithelial cells followed by elution of the adherent bacteria with methyl -D-mannopyranoside. When the methyl -D-mannopyranoside-displaced organisms were washed free of the sugar, they exhibited a high degree of mannose-binding activity and were heavily piliated. In contrast, the nonadherent fraction of organisms lacked detectable mannose-binding activity and were devoid of pili. Our results suggest that the binding activity of a mannose-specific lectin on the surface of E. coli can be quantitated directly on intact organisms, and the observed variations in the amount of mannose-binding activity among human isolates accounts for the variation in adherence of the organisms to mannose residues on epithelial cells.

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