5 years ago

IL-10-producing regulatory B cells induced by IL-33 (BregIL-33) effectively attenuate mucosal inflammatory responses in the gut

Regulatory B cells (Breg) have attracted increasing attention for their roles in maintaining peripheral tolerance. Interleukin 33 (IL-33) is a recently identified IL-1 family member, which leads a double-life with both pro- and anti-inflammatory properties. We report here that peritoneal injection of IL-33 exacerbated inflammatory bowel disease in IL-10-deficient (IL-10−/−) mice, whereas IL-33-treated IL-10-sufficient (wild type) mice were protected from the disease induction. A phenotypically unconventional subset(s) (CD19+CD25+CD1dhiIgMhiCD5-CD23-Tim-1-) of IL-10 producing Breg-like cells (BregIL-33) was identified responsible for the protection. We demonstrated further that BregIL-33 isolated from these mice could suppress immune effector cell expansion and functions and, upon adoptive transfer, effectively blocked the development of spontaneous colitis in IL-10−/− mice. Our findings indicate an essential protective role, hence therapeutic potential, of BregIL-33 against mucosal inflammatory disorders in the gut.

Publisher URL: www.sciencedirect.com/science

DOI: S0896841114000377

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