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Role of Sialic Acid in Brachyspira Hyodysenteriae Adhesion to Pig Colonic Mucins

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Journal Infect Immun
Date 2019 Apr 17
PMID 30988055
Citations 8
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Abstract

Infection with results in mucoid hemorrhagic diarrhea. This pathogen is associated with the colonic mucus layer, mainly composed of mucins. Infection regulates mucin -glycosylation in the colon and increases mucin secretion as well as binding sites on mucins. Here, we analyzed potential mucin epitopes for adhesion in the colon, as well as the effect of colonic mucins on bacterial growth. Associations between binding to pig colonic mucins and mucin glycan data showed that binding was associated with the presence of -glycolylneuraminic acid (NeuGc) on mucins. The role of sialic acid in adhesion was analyzed after the removal of sialic acid residues on the mucins by enzymatic treatment with sialidase A, which decreased bacterial binding to the mucins. The effect of pig colonic mucins on growth was determined in carbohydrate-free medium. growth increased in the presence of mucins from two out of five infected pigs, suggesting utilization of mucins as a carbon source for growth. Additionally, bacterial growth was enhanced by free sialic acid and -acetylglucosamine. The results highlight a role of sialic acid as an adhesion epitope for interaction with colonic mucins. Furthermore, the mucin response and glycosylation changes exerted in the colon during infection result in a potentially favorable environment for pathogen growth in the intestinal mucus layer.

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