Interleukin 23 production by intestinal CD103(+)CD11b(+) dendritic cells in response to bacterial flagellin enhances mucosal innate immune defense.

Interleukin 23 production by intestinal CD103(+)CD11b(+) dendritic cells in response to bacterial flagellin enhances mucosal innate immune defense.
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白介素23肠CD103(+)CD11b(+)树突状细胞对细菌鞭毛蛋白的产生增强了粘膜先天性免疫防御。

DOI:
10.1016/j.immuni.2011.12.011
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发表时间:
2012-02-24
期刊:
影响因子:
32.4
通讯作者:
Pamer EG
Pamer EG
中科院分区:
医学1区
文献类型:
--
作者:
Kinnebrew MA;Buffie CG;Diehl GE;Zenewicz LA;Leiner I;Hohl TM;Flavell RA;Littman DR;Pamer EG

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肠道上皮屏障的微生物渗透引发炎症反应,包括诱导杀菌C型凝集素RegIIIγ。全身给予鞭毛蛋白(一种刺激Toll样受体5(TLR 5)的细菌蛋白),诱导RegIIIγ的上皮表达,并保护小鼠免受耐药细菌的肠道定植。鞭毛蛋白诱导的RegIIIγ表达是IL-22依赖性的,但TLR信号传导如何导致IL-22表达尚不完全确定。使用固有层树突状细胞(LPDC)亚群的条件性耗竭,我们证明了CD 103 + CD 11b + LPDC,而不是单核细胞来源的CD 103 − CD 11b + LPDC,在细菌鞭毛蛋白给药后表达大量IL-23,并驱动IL-22依赖性RegIIIγ的产生。IL-23亚基IL-23 p19和IL-12 p40的最大表达发生在暴露于鞭毛蛋白的60分钟内。IL-23随后诱导IL-22爆发,随后持续RegIIIγ表达。因此,CD 103 + CD 11b + LPDC除了促进对摄入抗原的长期耐受外,还响应于固有层中鞭毛蛋白的检测而快速产生IL-23。
Microbial penetration of the intestinal epithelial barrier triggers inflammatory responses that include induction of the bactericidal C-type lectin RegIIIγ. Systemic administration of flagellin, a bacterial protein that stimulates Toll-like receptor 5 (TLR5), induces epithelial expression of RegIIIγ and protects mice from intestinal colonization with antibiotic-resistant bacteria. Flagellin-induced RegIIIγ expression is IL-22-dependent, but how TLR signaling leads to IL-22 expression is incompletely defined. Using conditional depletion of lamina propria dendritic cell (LPDC) subsets, we demonstrated that CD103+ CD11b+ LPDCs, but not monocyte-derived CD103− CD11b+ LPDCs, expressed high amounts of IL-23 following bacterial flagellin administration and drove IL-22-dependent RegIIIγ production. Maximal expression of IL-23 subunits IL-23p19 and IL-12p40 occurred within 60 minutes of exposure to flagellin. IL-23 subsequently induced a burst of IL-22 followed by sustained RegIIIγ expression. Thus, CD103+ CD11b+ LPDCs, in addition to promoting long-term tolerance to ingested antigens, also rapidly produce IL-23 in response to detection of flagellin in the lamina propria.
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