Innate PLZF+CD4+ αβ T cells develop and expand in the absence of Itk.

Innate PLZF+CD4+ αβ T cells develop and expand in the absence of Itk.
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DOI:
10.4049/jimmunol.1302058
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发表时间:
2014-07-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Berg LJ
Berg LJ
中科院分区:
其他
文献类型:
--
作者:
Prince AL;Watkin LB;Yin CC;Selin LK;Kang J;Schwartzberg PL;Berg LJ

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胸腺中的T细胞发育产生多种细胞谱系,包括先天性T细胞。在TCR信号传导蛋白或转录调节因子发生改变的小鼠中进行的研究显示,胸腺中产生IL-4并表达转录因子PLZF的CD 4+先天性T细胞群体扩大。在这些小鼠中,由CD 4 + PLZF+ T细胞群产生的IL-4导致常规CD 8+胸腺细胞转化为先天性CD 8 + T细胞,其类似于表达Eomesodermin的记忆T细胞。这些先天性CD 4 + T细胞中标志性iNKT细胞转录因子PLZF的表达表明它们可能是αβ或γδ TCR+ NKT细胞或MAIT细胞的一个子集。为了解决这些可能性,我们表征了itk-/-小鼠中的CD 4 + PLZF+先天性T细胞。我们发现itk-/-先天性PLZF+ CD 4 + T细胞不是CD 1d依赖性NKT细胞,MR 1依赖性MAIT细胞,也不是γδ T细胞。此外,虽然itk-/-先天PLZF+ CD 4 + T细胞表达αβ TCR,但它们的发育既不需要β 2 m依赖性MHC I类分子,也不需要任何MHC II类分子。与iNKT细胞和MAIT细胞相比,该群体具有高度多样性的TCRα链库。外周组织分析表明,由于肠道归巢受体表达增加,itk-/-先天性PLZF+ CD 4 + T细胞优先归巢至脾和肠系膜淋巴结,并且它们的扩增受肠道植物群调节。这些数据支持以下结论:itk-/-先天性PLZF+ CD 4 + T细胞是先天性T细胞的新亚群。
T cell development in the thymus produces multiple lineages of cells, including innate T cells. Studies in mice harboring alterations in TCR signaling proteins or transcriptional regulators have revealed an expanded population of CD4+ innate T cells in the thymus that produce IL-4 and express the transcription factor PLZF. In these mice, IL-4 produced by the CD4+ PLZF+ T cell population leads to the conversion of conventional CD8+ thymocytes into innate CD8+ T cells resembling memory T cells expressing Eomesodermin. The expression of PLZF, the signature iNKT cell transcription factor, in these innate CD4+ T cells suggests that they might be a subset of αβ or γδ TCR+ NKT cells or MAIT cells. To address these possibilities, we characterized the CD4+ PLZF+ innate T cells in itk-/- mice. We show that itk-/- innate PLZF+ CD4+ T cells are not CD1d-dependent NKT cells, MR1-dependent MAIT cells, nor γδ T cells. Further, although the itk-/- innate PLZF+ CD4+ T cells express αβ TCRs, neither β2m-dependent MHC class I nor any MHC class II molecules are required for their development. In contrast to iNKT cells and MAIT cells, this population has a highly diverse TCRα chain repertoire. Analysis of peripheral tissues indicates that itk-/- innate PLZF+ CD4+ T cells preferentially home to spleen and mesenteric lymph nodes due to increased expression of gut-homing receptors, and that their expansion is regulated by commensal gut flora. These data support the conclusion that itk-/- innate PLZF+ CD4+ T cells are a novel subset of innate T cells.
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