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.
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DOI:
10.1371/journal.pone.0030592
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Zhao Y
中科院分区:
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
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.
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影响因子:
30.5
作者:
通讯作者:
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影响因子:
30.5
作者:
通讯作者:
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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
影响因子:
5.9
作者:
Ma, Jianhui;Sun, Qian;Zhang, Hongbing
通讯作者:
Zhang, Hongbing
影响因子:
8.7
作者:
Araki K;Youngblood B;Ahmed R
通讯作者:
Ahmed R