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-Bearing Regulatory Cells1
* Immune-Mediated Diseases Section, Department of Infectious, Parasitic, and Immune-Mediated Diseases, and
Department of Cell Biology and Neurosciences, Istituto Superiore di Sanità, Rome, Italy; and
Mucosal Immunity Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
Recent studies of murine models of mucosal inflammation suggest that, whereas some kinds of bacterial microflora are inducers of disease, others, known as probiotics, prevent disease. In the present study, we analyzed the regulatory cytokine and cell response to probiotic (VSL#3) administration in the context of the Th1 T cell colitis induced by trinitrobenzene sulfonic acid treatment of SJL/J mice. Daily administration of probiotics for 3 wk to mice during a remission period between a first and second course of colitis induced by trinitrobenzene sulfonic acid, resulted in a milder form of recurrent colitis than observed in mice administered PBS during this same period. This protective effect was attributable to effects on the lamina propria mononuclear cell (LPMC) population, because it could be transferred by LPMC from probiotic-treated mice to naive mice. Probiotic administration was associated with an early increase in the production of IL-10 and an increased number of regulatory CD4+ T cells bearing surface TGF-
in the form of latency-associated protein (LAP) (LAP+ T cells). The latter were dependent on the IL-10 production because administration of anti-IL-10R mAb blocked their appearance. Finally, the LAP+ T cells were essential to the protective effect of probiotics because administration of anti-IL-10R or anti-TGF- at the initiation of recurrent colitis induction or depletion of LAP+ T cells from LPMC abolished the latter’s capacity to transfer protection to naive recipients. These studies show that probiotic (VSL#3) administration during a remission period ameliorates the severity of recurrent colitis by inducing an immunoregulatory response involving TGF--bearing regulatory cells.
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