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• W2160579940 abstract "<h3>Background and aims</h3> Inflammatory bowel disease (IBD) has been linked to a loss of tolerance towards the resident microflora. Therapeutic use of probiotics is known to be strain specific, but precise mechanisms remain unclear. The role of NOD2 signalling and the protective effect of <i>Lactobacillus</i> peptidoglycan (PGN) and derived muropeptides in experimental colitis were evaluated. <h3>Methods</h3> The anti-inflammatory capacity of lactobacilli and derived bacterial compounds was evaluated using the 2,4,6-trinitrobenzene sulfonic acid (TNBS) colitis model. The role of NOD2, MyD88 and interleukin 10 (IL-10) in this protection was studied using <i>Nod2</i>^−/−, <i>MyD88</i>^−/− and <i>Il10</i>-deficient mice, while induction of regulatory dendritic cells (DCs) was monitored through the expansion of CD103⁺ DCs in mesenteric lymph nodes or after adoptive transfer of bone marrow-derived DCs. The development of regulatory T cells was investigated by following the expansion of CD4⁺FoxP3⁺ cells. High-performance liquid chromatography and mass spectrometry were used to analyse the PGN structural differences. <h3>Results</h3> The protective capacity of strain <i>Lactobacillus salivarius</i> Ls33 was correlated with a local IL-10 production and was abolished in <i>Nod2</i>-deficient mice. PGN purified from Ls33 rescued mice from colitis in an IL-10-dependent manner and favoured the development of CD103⁺ DCs and CD4⁺Foxp3⁺ regulatory T cells. In vitro Ls33 PGN induced IL-10-producing DCs able to achieve in vivo protection after adoptive transfer in a NOD2-dependent way. This protection was also correlated with an upregulation of the indoleamine 2,3-dioxygenase immunosuppressive pathway. The protective capacity was not obtained with PGN purified from a non-anti-inflammatory strain. Structural analysis of PGNs highlighted in Ls33 the presence of an additional muropeptide, M-tri-Lys. The synthesised ligand protected mice from colitis in a NOD2-dependent but MyD88-independent manner. <h3>Conclusions</h3> The results indicated that PGN and derived muropeptides are active compounds in probiotic functionality and might represent a useful therapeutic strategy in IBD." @default.
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• W2160579940 date "2011-04-06" @default.
• W2160579940 modified "2023-10-18" @default.
• W2160579940 title "Anti-inflammatory capacity of selected lactobacilli in experimental colitis is driven by NOD2-mediated recognition of a specific peptidoglycan-derived muropeptide" @default.
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• W2160579940 doi "https://doi.org/10.1136/gut.2010.232918" @default.
• W2160579940 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21471573" @default.
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