title: The structure and immunomodulatory activity on intestinal epithelial cells of the EPSs isolated from Lactobacillus helveticus sp. Rosyjski and Lactobacillus acidophilus sp. 5e2.
abstract: The Lactic acid bacteria (LAB) Lactobacillus acidophilus sp. 5e2 and Lactobacillus helveticus sp. Rosyjski both secrete exopolysaccharides (EPSs) into their surrounding environments during growth. A number of EPSs have previously been shown to exhibit immunomodulatory activity with professional immune cells, such as macrophages, but only limited studies have been reported of their interaction with intestinal epithelial cells. An investigation of the immunomodulatory potential of pure EPSs, isolated from cultures of Lactobacillus acidophilus sp. 5e2 and Lactobacillus helveticus sp. Rosyjski, with the HT29-19A intestinal epithelial cell line are reported here. For the first time the structure of the EPS from Lactobacillus helveticus sp. Rosyjski which is a hetropolysaccharide with a branched pentasaccharide repeat unit containing d-glucose, d-galactose and N-acetyl-d-mannosamine is described. In response to exposure to lactobacilli EPSs HT29-19A cells produce significantly increased levels of the proinflammatory cytokine IL-8. Additionally, the EPSs differentially modulate the mRNA expression of Toll-like receptors. Finally, the pre-treatment of HT29-19A cells with the EPSs sensitises the cells to subsequent challenge with bacterial antigens. The results reported here suggest that EPSs could potentially play a role in intestinal homeostasis via a specific interaction with intestinal epithelial cells.
authors.affiliation: Department of Chemical and Biological Sciences, University of Huddersfield, Queensgate, Huddersfield, West Yorkshire HD1 3DH, UK.
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Patten
authors.affiliation: Department of Chemical and Biological Sciences, University of Huddersfield, Queensgate, Huddersfield, West Yorkshire HD1 3DH, UK.
authors.forename: Shaun
authors.initials: S
authors.lastname: Leivers
authors.affiliation: Department of Chemical and Biological Sciences, University of Huddersfield, Queensgate, Huddersfield, West Yorkshire HD1 3DH, UK.
authors.forename: Marcus J
authors.initials: MJ
authors.lastname: Chadha
authors.affiliation: Department of Chemical and Biological Sciences, University of Huddersfield, Queensgate, Huddersfield, West Yorkshire HD1 3DH, UK.
authors.forename: Mohammed
authors.initials: M
authors.lastname: Maqsood
authors.affiliation: Department of Chemical and Biological Sciences, University of Huddersfield, Queensgate, Huddersfield, West Yorkshire HD1 3DH, UK.
authors.forename: Paul N
authors.initials: PN
authors.lastname: Humphreys
authors.affiliation: Department of Chemical and Biological Sciences, University of Huddersfield, Queensgate, Huddersfield, West Yorkshire HD1 3DH, UK. Electronic address: a.p.laws@hud.ac.uk.
authors.forename: Andrew P
authors.initials: AP
authors.lastname: Laws
authors.affiliation: Department of Chemical and Biological Sciences, University of Huddersfield, Queensgate, Huddersfield, West Yorkshire HD1 3DH, UK. Electronic address: A.Collett@hud.ac.uk.
authors.forename: Andrew
authors.initials: A
authors.lastname: Collett
mesh_terms: D002236:Carbohydrate Conformation; D004847:Epithelial Cells / Q000166:cytology / Q000187:drug effects / Q000276:immunology*; D019073:HT29 Cells; D006801:Humans; D056747:Immunomodulation / Q000187:drug effects / Q000276:immunology*; D007422:Intestines / Q000166:cytology*; D007779:Lactobacillus acidophilus / Q000737:chemistry*; D052198:Lactobacillus helveticus / Q000737:chemistry*; D011135:Polysaccharides, Bacterial / Q000737:chemistry* / Q000276:immunology* / Q000302:isolation & purification / Q000494:pharmacology
chemical_list: D011135:Polysaccharides, Bacterial
keywords: Exopolysaccharides; Innate immunity; Intestinal epithelial cells; Lactobacilli; Toll-like receptors