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  • Title: Autocrine stimulation of IL-10 is critical to the enrichment of IL-10-producing CD40(hi)CD5(+) regulatory B cells in vitro and in vivo.
    Author: Kim HS, Lee JH, Han HD, Kim AR, Nam ST, Kim HW, Park YH, Lee D, Lee MB, Park YM, Kim HS, Kim YM, You JC, Choi WS.
    Journal: BMB Rep; 2015 Jan; 48(1):54-9. PubMed ID: 25341924.
    Abstract:
    IL-10-producing B (Breg) cells regulate various immune responses. However, their phenotype remains unclear. CD40 expression was significantly increased in B cells by LPS, and the Breg cells were also enriched in CD40(hi)CD5(+) B cells. Furthermore, CD40 expression on Breg cells was increased by IL-10, CD40 ligand, and B cell-activating factor, suggesting that CD40(hi) is a common phenotype of Breg cells. LPS-induced CD40 expression was largely suppressed by an anti-IL-10 receptor antibody and in IL-10(-/-)CD5(+)CD19(+) B cells. The autocrine effect of IL-10 on the CD40 expression was largely suppressed by an inhibitor of JAK/STAT3. In vivo, the LPS treatment increased the population of CD40(hi)CD5(+) Breg cells in mice. However, the population of CD40(hi)CD5(+) B cells was minimal in IL-10(-/-) mice by LPS. Altogether, our findings show that Breg cells are largely enriched in CD40(hi)CD5(+) B cells and the autocrine effect of IL-10 is critical to the formation of CD40(hi)CD5(+) Breg cells.
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