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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.

bmb reports

Autocrine stimulation of IL-10 is critical to the enrichment of IL-10-producing CD40<sup>hi</sup>CD5<sup>+</sup>regulatory B cells in vitro and in vivo

Autocrine stimulation of IL-10 is critical to the enrichment of IL-10-producing CD40hiCD5+regulatory B cells in vitro and in vivo

Autocrine stimulation of IL-10 is critical to the enrichment of IL-10-producing CD40^hiCD5⁺regulatory B cells in vitro and in vivo