Stromal mesenteric lymph node cells are essential for the generation of gut-homing T cells in vivo.

Stromal mesenteric lymph node cells are essential for the generation of gut-homing T cells in vivo.
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DOI:
10.1084/jem.20080039
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发表时间:
2008-10-27
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Pabst O
Pabst O
中科院分区:
其他
文献类型:
--
作者:
Hammerschmidt SI;Ahrendt M;Bode U;Wahl B;Kremmer E;Förster R;Pabst O

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在肠引流肠系膜淋巴结(mLN)中引发的T细胞被印迹以表达α4β7-整联蛋白和趋化因子受体CCR 9,从而使淋巴细胞能够迁移到小肠。通过肠树突状细胞(DC)或添加视黄酸(RA)的体外活化足以指导这些肠道归巢分子的表达。我们报告说,在体内基质细胞,而不是DC,允许mLN诱导产生的肠道向性。移植到肠肠系膜中的外周LN(pLN)不能支持肠归巢T细胞的产生,即使肠来源的DC进入移植物并引发T细胞。在体外不能诱导α4β7-整联蛋白和CCR 9的DC在体内注射到mLN传入神经系统后容易诱导这些因子。此外,独特的肠系膜而不是pLN基质细胞表达高水平的RA产生酶,并支持体外活化T细胞上的CCR 9诱导。这些结果表明,迄今尚未认识到的贡献基质细胞传递的信号,包括RA,在体内的组织向性的印记。
T cells primed in the gut-draining mesenteric lymph nodes (mLN) are imprinted to express α4β7-integrin and chemokine receptor CCR9, thereby enabling lymphocytes to migrate to the small intestine. In vitro activation by intestinal dendritic cells (DC) or addition of retinoic acid (RA) is sufficient to instruct expression of these gut-homing molecules. We report that in vivo stroma cells, but not DC, allow the mLN to induce the generation of gut tropism. Peripheral LN (pLN) transplanted into the gut mesenteries fail to support the generation of gut-homing T cells, even though gut-derived DC enter the transplants and prime T cells. DC that fail to induce α4β7-integrin and CCR9 in vitro readily induce these factors in vivo upon injection into mLN afferent lymphatics. Moreover, uniquely mesenteric but not pLN stroma cells express high levels of RA-producing enzymes and support induction of CCR9 on activated T cells in vitro. These results demonstrate a hitherto unrecognized contribution of stromal cell delivered signals, including RA, on the imprinting of tissue tropism in vivo.
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