Prevention of TNBS-induced colitis by different Lactobacillus and Bifidobacterium strains is associated with an expansion of γδT and regulatory T cells of intestinal intraepithelial lymphocytes
Article first published online: 5 JUN 2009
Copyright © 2009 Crohn's & Colitis Foundation of America, Inc.
Inflammatory Bowel Diseases
Volume 15, Issue 10, pages 1526–1536, October 2009
How to Cite
Roselli, M., Finamore, A., Nuccitelli, S., Carnevali, P., Brigidi, P., Vitali, B., Nobili, F., Rami, R., Garaguso, I. and Mengheri, E. (2009), Prevention of TNBS-induced colitis by different Lactobacillus and Bifidobacterium strains is associated with an expansion of γδT and regulatory T cells of intestinal intraepithelial lymphocytes. Inflamm Bowel Dis, 15: 1526–1536. doi: 10.1002/ibd.20961
- Issue published online: 11 SEP 2009
- Article first published online: 5 JUN 2009
- Manuscript Accepted: 16 MAR 2009
- Manuscript Received: 27 DEC 2008
- probiotic mixtures;
- intestinal epithelial cells;
- γδT cells;
- regulatory T cells
Probiotics may protect against inflammatory bowel disease through regulation of lamina propria lymphocytes (LPLs) function. Data are lacking on possible involvement of intraepithelial lymphocytes (IELs). The aim of this study was to investigate whether different probiotic mixtures prevented gut inflammatory disease and the role of both IELs and LPLs.
BALB/c mice received 2 probiotic mixtures orally for 3 weeks, as Mix1 (Lactobacillus acidophilus and Bifidobacterium longum), or Mix2 (Lactobacillus plantarum, Streptococcus thermophilus, and Bifidobacterium animalis subsp. lactis). Colitis was induced by intrarectal administration of trinitrobenzene sulfonic acid (TNBS). Probiotics in stools were analyzed by real-time polymerase chain reaction (PCR). Colon subpopulations of IELs and LPLs were assayed by flow cytometry. Serum cytokines were measured by cytometric bead array (CBA).
All probiotics colonized the intestine. The 2 mixtures prevented the TNBS-induced intestinal damage, and Mix1 was the most effective. The Mix1 protection was associated with a reduction in CD4+ cells of IELs and LPLs, an increase in γδT cells of IELs, and a decrease in γδT cells of LPLs. An expansion of T regulatory (Treg) cells of IELs was induced by Mix1 and Mix2. Both probiotic mixtures inhibited tumor necrosis factor (TNF)-α and monocyte chemotactic protein (MCP)-1 production and upregulated interleukin (IL)-10. In addition, Mix1 prevented the TNBS-induced increase of IL-12 and interferon (IFN)-γ.
The 2 probiotic mixtures were able to prevent the TNBS-induced colitis; the L. acidophilus and B. longum mixture was the most effective. Other than an involvement of LPLs, our results report a novel importance of the IELs population in probiotic protection. Inflamm Bowel Dis 2009