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IL-7 derived from lymph node fibroblastic reticular cells is dispensable for naive T cell homeostasis but crucial for central memory T cell survival.
European Journal of Immunology ( IF 4.5 ) Pub Date : 2020-02-11 , DOI: 10.1002/eji.201948368
Laura Knop 1 , Katrin Deiser 1 , Ute Bank 1 , Amelie Witte 1 , Juliane Mohr 1 , Lars Philipsen 1 , Hans J Fehling 2 , Andreas J Müller 1, 3 , Ulrich Kalinke 4 , Thomas Schüler 1
Affiliation  

The survival of peripheral T cells is dependent on their access to peripheral LNs (pLNs) and stimulation by IL‐7. In pLNs fibroblastic reticular cells (FRCs) and lymphatic endothelial cells (LECs) produce IL‐7 suggesting their contribution to the IL‐7‐dependent survival of T cells. However, IL‐7 production is detectable in multiple organs and is not restricted to pLNs. This raises the question whether pLN‐derived IL‐7 is required for the maintenance of peripheral T cell homeostasis. Here, we show that numbers of naive T cells (TN) remain unaffected in pLNs and spleen of mice lacking Il7 gene activity in pLN FRCs, LECs, or both. In contrast, frequencies of central memory T cells (TCM) are reduced in FRC‐specific IL‐7 KO mice. Thus, steady state IL‐7 production by pLN FRCs is critical for the maintenance of TCM, but not TN, indicating that both T cell subsets colonize different ecological niches in vivo.

中文翻译:

源自淋巴结成纤维细胞网状细胞的IL-7对于幼稚T细胞稳态是必不可少的,但对中央记忆T细胞存活至关重要。

外周T细胞的存活取决于它们对外周LNs(pLNs)的访问和IL-7的刺激。在pLN中,成纤维细胞网状细胞(FRC)和淋巴管内皮细胞(LEC)产生IL-7,表明它们对T细胞依赖IL-7的存活做出了贡献。但是,IL-7的产生可在多个器官中检测到,并不局限于pLN。这就提出了一个问题,即维持外周T细胞稳态是否需要pLN衍生的IL-7。在这里,我们显示了在pLN FRC和/或LEC中缺少Il7基因活性的小鼠的pLNs和脾脏中,幼稚T细胞(T N)的数量仍然不受影响。相比之下,中央记忆T细胞的频率(T CM)在FRC特异性IL-7 KO小鼠中减少。因此,pLN FRC产生的稳定状态IL-7对维持T CM至关重要,但对T N却不重要,这表明这两个T细胞亚群在体内定居于不同的生态位。
更新日期:2020-02-11
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