T regulatory cells maintain intestinal homeostasis by suppressing γδ T cells.

T regulatory cells maintain intestinal homeostasis by suppressing γδ T cells.
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DOI:
10.1016/j.immuni.2010.10.014
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发表时间:
2010-11-24
期刊:
影响因子:
32.4
通讯作者:
Ghosh S
Ghosh S
中科院分区:
医学1区
文献类型:
--
作者:
Park SG;Mathur R;Long M;Hosh N;Hao L;Hayden MS;Ghosh S

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Immune tolerance against enteric commensal bacteria is important for preventing intestinal inflammation. Deletion of phosphoinositide dependent protein kinase 1 (Pdk1) in T cells using Cd4-Cre induced chronic inflammation of the intestine despite the importance of PDK1 in T cell activation. Analysis of colonic intraepithelial lymphocytes of PDK1-deficient mice revealed markedly increased CD8α+ T cell receptor (TCR)γδ+ T cells, including an interleukin-17 (IL-17)-expressing population. TCRγδ+ T cells were responsible for the inflammatory colitis as deletion of Tcrd abolished spontaneous colitis in the PDK1 deficient mice. This dysregulation of intestinal TCRγδ+ T cells was attributable to a reduction in the number and functional capacity of PDK1-deficient T-regulatory (Treg) cells. Adoptive transfer of wild-type Treg cells abrogated the spontaneous activation and proliferation of intestinal TCRγδ+ T cells observed in PDK1-deficient mice and prevented the development of colitis. Therefore suppression of intestinal TCRγδ+ T cells by Treg cells maintains enteric immune tolerance.
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