TSC1/2 signaling complex is essential for peripheral naïve CD8+ T cell survival and homeostasis in mice.

TSC1/2 signaling complex is essential for peripheral naïve CD8+ T cell survival and homeostasis in mice.
复制标题

DOI:
10.1371/journal.pone.0030592
复制
发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Zhao Y
Zhao Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Zhang L;Zhang H;Li L;Xiao Y;Rao E;Miao Z;Chen H;Sun L;Li H;Liu G;Zhao Y

文献摘要

参考文献

被引文献

相似文献

PI3K-Akt-mTOR通路在调节先天免疫和获得性免疫中起着重要作用。然而,TSC1,mTOR的关键负调节因子,在外周T细胞稳态中的作用仍然不清楚。在T细胞特异性TSC1条件性基因敲除(TSC1KO)小鼠中,我们发现外周原始CD8+T细胞严重减少,但没有CD4+T细胞。尽管对照组和KO CD8+T细胞表达CD122和CD127相似,但在过继转移模型和在IL-7或IL-15刺激的培养中,TSC1 KO幼稚CD8+T细胞表现出严重的存活缺陷。在TSC1 KO初始CD8+T细胞中,由于过度活跃的mTOR对PI3K-AKT信号的反馈抑制,IL-7刺激的Akt(S473)的磷酸化水平降低。此外,在IL-7刺激下,TSC1幼稚CD8+T细胞的Foxo1/Foxo3a磷酸化水平降低,促凋亡的Bim表达增加。总之,我们的研究表明,TSC1可能通过mTOR-Akt-FoxO-Bim信号通路在调节外周原始CD8+T细胞动态平衡方面发挥重要作用。
The PI3K-Akt-mTOR pathway plays crucial roles in regulating both innate and adaptive immunity. However, the role of TSC1, a critical negative regulator of mTOR, in peripheral T cell homeostasis remains elusive. With T cell-specific Tsc1 conditional knockout (Tsc1 KO) mice, we found that peripheral naïve CD8+ T cells but not CD4+ T cells were severely reduced. Tsc1 KO naïve CD8+ T cells showed profound survival defect in an adoptive transfer model and in culture with either stimulation of IL-7 or IL-15, despite comparable CD122 and CD127 expression between control and KO CD8+ T cells. IL-7 stimulated phosphorylation of Akt(S473) was diminished in Tsc1 KO naïve CD8+T cells due to hyperactive mTOR-mediated feedback suppression on PI3K-AKT signaling. Furthermore, impaired Foxo1/Foxo3a phosphorylation and increased pro-apoptotic Bim expression in Tsc1 KO naïve CD8+T cells were observed upon stimulation of IL-7. Collectively, our study suggests that TSC1 plays an essential role in regulating peripheral naïve CD8+ T cell homeostasis, possible via an mTOR-Akt-FoxO-Bim signaling pathway.
DOI: 10.1038/ni.1689
发表时间: 2009-02
期刊: Nature immunology
影响因子: 30.5
作者:
通讯作者: --
DOI: 10.1073/pnas.1014769108
发表时间: 2011-03-08
影响因子: 11.1
作者:
Sun, Qian;Chen, Xinxin;Zhang, Hongbing
通讯作者: Zhang, Hongbing
DOI: 10.1016/j.jgg.2011.10.002
发表时间: 2011-11-01
影响因子: 5.9
作者:
Ma, Jianhui;Sun, Qian;Zhang, Hongbing
通讯作者: Zhang, Hongbing
DOI: 10.1111/j.0105-2896.2010.00898.x
发表时间: 2010-05
影响因子: 8.7
作者:
Araki K;Youngblood B;Ahmed R
通讯作者: Ahmed R