Combined protective effects of dairy propionic bacteria and n-6 polyunsaturated fatty acids on the intestinal epithelial barrier - Archive ouverte HAL Access content directly
Conference Poster Year : 2022

Combined protective effects of dairy propionic bacteria and n-6 polyunsaturated fatty acids on the intestinal epithelial barrier

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Abstract

Introduction Intestinal epithelial barrier (IEB) integrity plays a central role in the pathogenesis of inflammatory bowel disease (IBD). There is a growing interest in dietary compounds that can strengthen IEB. First, candidate strains of dairy propionic bacteria such as Propionibacterium freudenreichii are able to reduce inflammation and improve barrier strength. Knowing that certain products of omega-6 polyunsaturated fatty acid (n-6 PUFA) metabolism also reinforce IEB, and that bacteria can modulate the bioavailability of host lipid compounds, this project aims to identify strains of P. freudenreichii that could protect against colitis by strengthening IEB and increasing the bioavailability of certain n-6 PUFA. Methods A screening of thirty-three strains of P. freudenreichii was performed based on the following criteria: 1) characterization of the ability to induce production of anti-inflammatory cytokines (IL-10) by stimulation of human PBMCs 2) identification of surface proteins (S-layer protein) responsible for anti-inflammatory properties 3) measurement of their ability to increase the bioavailability of certain n-6 PUFAs, such as conjugated linoleic acids (CLAs). The ability of the selected fermented products to prevent the inflammation-induced increase in permeability of an IEB was then studied. Results All strains are able to induce IL-10 production and release CLAs. Ten strains show an anti-inflammatory S-layer profile. Some fermented products significantly prevent the inflammation-induced increase in permeability, and may involve surface proteins and bioactive lipids. Discussion These results will allow the selection of strains with anti-inflammatory as well as pro-repair potential to be tested in vivo to reduce colitis, with or without n-6 PUFA supplementation.
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Dates and versions

hal-03817222 , version 1 (17-10-2022)

Identifiers

  • HAL Id : hal-03817222 , version 1

Cite

Mantel Marine, Maxime M Mahe, Nassima Illikoud, Nicolas Cenac, Michel Neunlist, et al.. Combined protective effects of dairy propionic bacteria and n-6 polyunsaturated fatty acids on the intestinal epithelial barrier. 17e congrès national de la SFM « La microbiologie dans tous ses états », Oct 2022, Montpellier, France. , 2022. ⟨hal-03817222⟩
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