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Gut commensal Lactobacillus reuteri 100‐23 stimulates an immunoregulatory response
Author(s) -
Livingston Megan,
Loach Diane,
Wilson Michelle,
Tannock Gerald W,
Baird Margaret
Publication year - 2010
Publication title -
immunology and cell biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.999
H-Index - 104
eISSN - 1440-1711
pISSN - 0818-9641
DOI - 10.1038/icb.2009.71
Subject(s) - lactobacillus reuteri , immune system , mesenteric lymph nodes , foxp3 , proinflammatory cytokine , biology , microbiology and biotechnology , spleen , immunology , cytokine , lactobacillus , inflammation , gastrointestinal tract , bacteria , biochemistry , genetics
Lactobacillus reuteri 100‐23 is a bacterial commensal of the gastrointestinal tract of mice. Previous studies have shown that colonization of the murine gut by this strain stimulates small‐bowel enterocytes to produce proinflammatory cytokines. This is associated with a mild, transitory inflammatory response 6 days after inoculation of formerly Lactobacillus ‐free animals. The inflammation subsides by 21 days after colonization, although lactobacilli continue to be present in the bowel. To determine the immunological mechanisms that underpin tolerance to bowel commensals, we investigated cytokine responses of dendritic cells and T cells after exposure to cells of L. reuteri 100‐23. Interleukin‐10 (IL‐10), IL‐2 and transforming growth factor‐β (TGF‐β) concentrations in supernatants of cultured immune cells, as well as the results of proliferative assays of mesenteric lymph node (MLN) cells and quantification of Foxp3‐positive cells in MLN and spleen, indicated that L. reuteri 100‐23 stimulated the development of an increased number of regulatory T cells.