BACKGROUND: Reduced microbial diversity has been associated with inflammatory bowel disease (IBD) and probiotic bacteria have been proposed for its prevention and/or treatment. Nevertheless, comparative studies of strains of the same subspecies for specific health benefits are scarce. Here we compared two Bifidobacterium longum ssp. longum strains for their capacity to prevent experimental colitis. METHODS: Immunomodulatory properties of nine probiotic bifidobacteria were assessed by stimulation of murine splenocytes. The immune responses to B. longum ssp. longum CCM 7952 (Bl 7952) and CCDM 372 (Bl 372) were further characterized by stimulation of bone marrow-derived dendritic cell, HEK293/TLR2 or HEK293/NOD2 cells. A mouse model of dextran sulphate sodium (DSS)-induced colitis was used to compare their beneficial effects in vivo. RESULTS: The nine bifidobacteria exhibited strain-specific abilities to induce cytokine production. Bl 372 induced higher levels of both pro- and anti-inflammatory cytokines in spleen and dendritic cell cultures compared to Bl 7952. Both strains engaged TLR2 and contain ligands for NOD2. In a mouse model of DSS-induced colitis, Bl 7952, but not Bl 372, reduced clinical symptoms and preserved expression of tight junction proteins. Importantly, Bl 7952 improved intestinal barrier function as demonstrated by reduced FITC-dextran levels in serum. CONCLUSIONS: We have shown that Bl 7952, but not Bl 372, protected mice from the development of experimental colitis. Our data suggest that although some immunomodulatory properties might be widespread among the genus Bifidobacterium, others may be rare and characteristic only for a specific strain. Therefore, careful selection might be crucial in providing beneficial outcome in clinical trials with probiotics in IBD.

• MeSH
• Bifidobacterium klasifikace   fyziologie   MeSH
• dendritické buňky mikrobiologie   patologie   MeSH
• HEK293 buňky MeSH
• imunoenzymatické techniky MeSH
• kolitida chemicky indukované   prevence a kontrola   MeSH
• lidé MeSH
• modely nemocí na zvířatech * MeSH
• myši inbrední BALB C MeSH
• myši MeSH
• probiotika farmakologie   MeSH
• signální adaptorový protein Nod2 genetika   metabolismus   MeSH
• síran dextranu toxicita   MeSH
• střeva mikrobiologie   patofyziologie   MeSH
• toll-like receptor 2 genetika   metabolismus   MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• myši MeSH
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• signální adaptorový protein Nod2 MeSH
• síran dextranu MeSH
• Tlr2 protein, mouse MeSH Prohlížeč
• toll-like receptor 2 MeSH

The structures of polysaccharides (PS) isolated from Lactobacillus rhamnosus LOCK 0900 and results from stimulation of mouse bone marrow-derived dendritic cells (BM-DC) and human embryonal kidney (HEK293) cells stably transfected with Toll-like receptors (TLR) upon exposure to these antigens were studied. L. rhamnosus LOCK 0900 produces PS that differ greatly in their structure. The polymer L900/2, with a high average molecular mass of 830 kDa, is a branched heteropolysaccharide with a unique repeating unit consisting of seven sugar residues and pyruvic acid, whereas L900/3 has a low average molecular mass of 18 kDa and contains a pentasaccharide repeating unit and phosphorus. Furthermore, we found that both described PS neither induce cytokine production and maturation of mouse BM-DC nor induce signaling through TLR2/TLR4 receptors. However, they differ profoundly in their abilities to modulate the BM-DC immune response to the well-characterized human isolate Lactobacillus plantarum WCFS1. Exposure to L900/2 enhanced interleukin-10 (IL-10) production induced by L. plantarum WCFS1, while in contrast, L900/3 enhanced the production of IL-12p70. We conclude that PS, probably due to their chemical features, are able to modulate the immune responses to third-party antigens. The ability to induce regulatory IL-10 by L900/2 opens up the possibility to use this PS in therapy of inflammatory conditions, such as inflammatory bowel disease, whereas L900/3 might be useful in reverting the antigen-dependent Th2-skewed immune responses in allergies.

• MeSH
• bakteriální polysacharidy chemie   imunologie   farmakologie   MeSH
• buňky kostní dřeně cytologie   MeSH
• cytokiny metabolismus   MeSH
• dendritické buňky účinky léků   imunologie   metabolismus   MeSH
• HEK293 buňky účinky léků   imunologie   MeSH
• imunologické faktory imunologie   farmakologie   MeSH
• konformace sacharidů MeSH
• Lacticaseibacillus rhamnosus chemie   imunologie   MeSH
• lidé MeSH
• magnetická rezonanční spektroskopie MeSH
• molekulová hmotnost MeSH
• monosacharidy analýza   MeSH
• myši inbrední BALB C MeSH
• probiotika MeSH
• toll-like receptor 2 metabolismus   MeSH
• toll-like receptor 4 metabolismus   MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• bakteriální polysacharidy MeSH
• cytokiny MeSH
• imunologické faktory MeSH
• monosacharidy MeSH
• TLR2 protein, human MeSH Prohlížeč
• TLR4 protein, human MeSH Prohlížeč
• toll-like receptor 2 MeSH
• toll-like receptor 4 MeSH