Cutting Edge: Differential Regulation of PTEN by TCR, Akt, and FoxO1 Controls CD4+ T Cell Fate Decisions.

Cutting Edge: Differential Regulation of PTEN by TCR, Akt, and FoxO1 Controls CD4+ T Cell Fate Decisions.
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DOI:
10.4049/jimmunol.1402554
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发表时间:
2015-05-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Morel PA
Morel PA
中科院分区:
其他
文献类型:
--
作者:
Hawse WF;Sheehan RP;Miskov-Zivanov N;Menk AV;Kane LP;Faeder JR;Morel PA

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Akt/mTOR信号通路影响CD4+T细胞分化;低水平有利于Treg诱导,高水平有利于Th诱导。尽管脂肪磷酸酶PTEN抑制Akt活性,但在T细胞中对PTEN活性的调控研究很少。在这里,我们确定了多种调节PTEN表达的机制。在Th诱导过程中,PTEN的功能通过降低mRNA水平、降低蛋白水平和增加C末端的磷酸化而受到抑制。相反,在Treg诱导过程中,PTEN的功能是通过稳定PTEN mRNA转录和持续的蛋白水平来维持的。我们证明了差异Akt/mTOR信号通过FoxO1转录因子调节PTEN的转录。一个包括多种模式的PTEN调节的数学模型概括了我们的实验结果,并演示了几个反馈环如何决定分化结果。总之,这项工作为PTEN的差异调控如何控制不同的CD4+T细胞命运结果提供了新的机制见解。
Signaling via the Akt/mTOR pathway influences CD4+ T cell differentiation; low levels favor Treg induction and high levels favor Th induction. Although the lipid phosphatase PTEN suppresses Akt activity the control of PTEN activity is poorly studied in T cells. Here, we identify multiple mechanisms that regulate PTEN expression. During Th induction, PTEN function is suppressed via lower mRNA levels, lower protein levels and an increase in C terminal phosphorylation. Conversely, during Treg induction, PTEN function is maintained through the stabilization of PTEN mRNA transcription and sustained protein levels. We demonstrate that differential Akt/mTOR signaling regulates PTEN transcription via the FoxO1 transcription factor. A mathematical model that includes multiple modes of PTEN regulation recapitulates our experimental findings and demonstrates how several feedback loops determine differentiation outcomes. Together, this work provides novel mechanistic insights into how differential regulation of PTEN controls alternate CD4+ T cell fate outcomes.
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