Alterations in the composition of intestinal commensal bacteria are associated with enhanced susceptibility to multiple inflammatory diseases, including those conditions associated with interleukin (IL)-17-producing CD4(+) T helper (Th17) cells. However, the relationship between commensal bacteria and the expression of proinflammatory cytokines remains unclear. Using germ-free mice, we show that the frequency of Th17 cells in the large intestine is significantly elevated in the absence of commensal bacteria. Commensal-dependent expression of the IL-17 family member IL-25 (IL-17E) by intestinal epithelial cells limits the expansion of Th17 cells in the intestine by inhibiting expression of macrophage-derived IL-23. We propose that acquisition of, or alterations in, commensal bacteria influences intestinal immune homeostasis via direct regulation of the IL-25 -IL-23 -IL-17 axis.
机构:
Washington Univ, Sch Med, Dept Mol Biol & Pharmacol, St Louis, MO 63110 USAWashington Univ, Sch Med, Dept Mol Biol & Pharmacol, St Louis, MO 63110 USA
Hooper, LV
Gordon, JI
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机构:
Washington Univ, Sch Med, Dept Mol Biol & Pharmacol, St Louis, MO 63110 USAWashington Univ, Sch Med, Dept Mol Biol & Pharmacol, St Louis, MO 63110 USA
机构:
Washington Univ, Sch Med, Dept Mol Biol & Pharmacol, St Louis, MO 63110 USAWashington Univ, Sch Med, Dept Mol Biol & Pharmacol, St Louis, MO 63110 USA
Hooper, LV
Gordon, JI
论文数: 0引用数: 0
h-index: 0
机构:
Washington Univ, Sch Med, Dept Mol Biol & Pharmacol, St Louis, MO 63110 USAWashington Univ, Sch Med, Dept Mol Biol & Pharmacol, St Louis, MO 63110 USA