期刊
INFLAMMATORY BOWEL DISEASES
卷 15, 期 10, 页码 1537-1547出版社
OXFORD UNIV PRESS INC
DOI: 10.1002/ibd.20930
关键词
NF-kappaB; probiotics; inflammatory bowel diseases; intestinal microbiota; proteasome
资金
- Crohn's and Colitis Foundation of Canada
- National Institutes of Health [DK064840, HD043839, AT004044, DK47722]
- Digestive Disease Research Core Center [DK42086]
Background: Bacteria play a role in inflammatory bowel disease and other forms of intestinal inflammation. Although much attention has focused on the search for a pathogen or inciting inflammatory bacteria, another possibility is a lack of beneficial bacteria that normally confer anti-inflammatory properties in the gut. The Purpose of this study was to determine whether normal commensal bacteria could inhibit inflammatory pathways important in intestinal inflammation. Methods: Conditioned media from Lactobacillus plantarum (Lp-CM) and other gut bacteria was used to treat intestinal epithelial cell (YAMC) and macrophage (RAW 264.7) or primary culture murine dendritic cells. NF-kappa B was activated through TNF-Receptor, MyD88-dependent and -independent pathways and effects of Lp-CM on the NF-kappa B pathway were assessed. NF-kappa B binding activity was measured using ELISA and EMSA. 1 kappa B expression was assessed by Western blot analysis, and proteasome activity determined using fluorescence-based proteasome assays. MCP-1 release was determined by ELISA. Results: Lp-CM inhibited NF-kappa B binding activity, degradation of I kappa B alpha and the chymotrypsin-like activity of the proteasome. Moreover, Lp-CM directly inhibited the activity of purified mouse proteasomes. This effect was specific, since conditioned media from other bacteria had no inhibitory effect. Unlike other proteasome inhibitors, Lp-CM wits not toxic in cell death assays. Lp-CM inhibited MCP-1 release in all cell types tested. Conclusions: These studies confirm, and provide a mechanism for, the anti-inflammatory effects of the probiotic and commensal bacterium Lactobacillus plantarum. The use of bacteria-free Lp-CM provides a novel strategy for treatment of intestinal inflammation which would eliminate the risk of bacteremia reported with conventional probiotics.
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