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首页> 外文期刊>Nature immunology >IL-7 coordinates proliferation, differentiation and Tcra recombination during thymocyte beta-selection
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IL-7 coordinates proliferation, differentiation and Tcra recombination during thymocyte beta-selection

机译:IL-7协调胸腺细胞β选择过程中的增殖,分化和Tcra重组

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摘要

Signaling via the pre-T cell antigen receptor (pre-TCR) and the receptor Notch1 induces transient self-renewal (beta-selection) of TCR beta(+) CD4(-)CD8(-) double-negative stage 3 (DN3) and DN4 progenitor cells that differentiate into CD4(+)CD8(+) double-positive (DP) thymocytes, which then rearrange the locus encoding the TCR alpha-chain (Tcra). Interleukin 7 (IL-7) promotes the survival of TCR beta(-) DN thymocytes by inducing expression of the pro-survival molecule BcI-2, but the functions of IL-7 during beta-selection have remained unclear. Here we found that IL-7 signaled TCR beta(+) DN3 and DN4 thymocytes to upregulate genes encoding molecules involved in cell growth and repressed the gene encoding the transcriptional repressor BcI-6. Accordingly, IL-7-deficient DN4 cells lacked trophic receptors and did not proliferate but rearranged Tcra prematurely and differentiated rapidly. Deletion of BcI6 partially restored the self-renewal of DN4 cells in the absence of IL-7, but overexpression of BCL2 did not. Thus, IL-7 critically acts cooperatively with signaling via the pre-TCR and Notchl to coordinate proliferation, differentiation and Tcra recombination during beta-selection.
机译:通过前T细胞抗原受体(pre-TCR)和受体Notch1进行信号诱导TCR beta(+)CD4(-)CD8(-)双阴性3期(DN3)的瞬时自我更新(β选择)和DN4祖细胞分化为CD4(+)CD8(+)双阳性(DP)胸腺细胞,然后再重排编码TCRα链(Tcra)的基因座。白细胞介素7(IL-7)通过诱导生存前分子Bcl-2的表达来促进TCRβ(-)DN胸腺细胞的存活,但IL-7在β选择过程中的功能仍不清楚。在这里,我们发现IL-7信号通知TCR beta(+)DN3和DN4胸腺细胞上调编码参与细胞生长的分子的基因,并抑制编码转录阻遏物BcI-6的基因。因此,IL-7缺陷DN4细胞缺乏营养受体,不会增殖,但会过早地重新排列Tcra并迅速分化。在没有IL-7的情况下,BcI6的缺失部分恢复了DN4细胞的自我更新,但BCL2的过表达却没有。因此,IL-7与经由pre-TCR和Notch1的信号传导至关重要地协同作用,以在β选择期间协调增殖,分化和Tcra重组。

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