Interleukin-10 (IL-10) is the most important anti-inflammatory cytokine at intestinal level, and its absence is involved in inflammatory bowel diseases. However, oral treatment with IL-10 is difficult because of its low survival in the gastrointestinal tract and systemic treatments lead to undesirable side effects. The aim of this paper was to evaluate the anti-inflammatory effect of the administration of milks fermented by Lactococcus lactis strains that produce IL-10 under the control of the xylose-inducible expression system using a trinitrobenzenesulfonic acid-induced colitis murine model. Mice that received milks fermented by L. lactis strains producing IL-10 in the cytoplasm (Cyt strain) or secreted to the product (Sec strain) showed lower damage scores in their large intestines, decreased IFN-γ levels in their intestinal fluids and lower microbial translocation to liver, compared to mice receiving milk fermented by the wild-type strain or those not receiving any treatment. The results obtained in this study show that the employment of fermented milks as a new form of administration of IL-10-producing L. lactis is effective in the prevention of inflammatory bowel disease in a murine model.

Keywords:
IL-10, Lactococcus lactis, Inflammatory bowel disease, Genetically modified microorganisms, TNBS, Lactic acid bacteria, Probiotics
© 2012 S. Karger AG, Basel
2012
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