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• W2163312085 abstract "ABSTRACT Propionibacterium freudenreichii is a bacterial species found in Swiss-type cheeses and is also considered for its health properties. The main claimed effect is the bifidogenic property. Some strains were shown recently to display other interesting probiotic potentialities such as anti-inflammatory properties. About 30% of strains were shown to produce a surface exopolysaccharide (EPS) composed of (1→3,1→2)-β -d- glucan due to a single gene named gtfF . We hypothesized that functional properties of P. freudenreichii strains, including their anti-inflammatory properties, could be linked to the presence of β-glucan. To evaluate this hypothesis, gtfF genes of three β-glucan-producing strains were disrupted. These knockout (KO) mutants were complemented with a plasmid harboring gtfF (KO-C mutants). The absence of β-glucan in KO mutants was verified by immunological detection and transmission electron microscopy. We observed by atomic force microscopy that the absence of β-glucan in the KO mutant dramatically changed the cell's topography. The capacity to adhere to polystyrene surface was increased for the KO mutants compared to wild-type (WT) strains. Anti-inflammatory properties of WT strains and mutants were analyzed by stimulation of human peripheral blood mononuclear cells (PBMCs). A significant increase of the anti-inflammatory interleukin-10 cytokine production by PBMCs was measured in the KO mutants compared to WT strains. For one strain, the role of β-glucan in mice gut persistence was assessed, and no significant difference was observed between the WT strain and its KO mutant. Thus, β-glucan appears to partly hide the anti-inflammatory properties of P. freudenreichii ; which is an important result for the selection of probiotic strains." @default.
• W2163312085 created "2016-06-24" @default.
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• W2163312085 date "2012-03-15" @default.
• W2163312085 modified "2023-09-30" @default.
• W2163312085 title "Contribution of Surface β-Glucan Polysaccharide to Physicochemical and Immunomodulatory Properties of Propionibacterium freudenreichii" @default.
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• W2163312085 doi "https://doi.org/10.1128/aem.07027-11" @default.
• W2163312085 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3298172" @default.
• W2163312085 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22247154" @default.
• W2163312085 hasPublicationYear "2012" @default.
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