Sin1-mTORC2 suppresses rag and il7r gene expression through Akt2 in B cells.

Sin1-mTORC2 suppresses rag and il7r gene expression through Akt2 in B cells.
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DOI:
10.1016/j.molcel.2010.07.031
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发表时间:
2010-08-13
期刊:
影响因子:
16
通讯作者:
Su B
Su B
中科院分区:
生物学1区
文献类型:
--
作者:
Lazorchak AS;Liu D;Facchinetti V;Di Lorenzo A;Sessa WC;Schatz DG;Su B

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哺乳动物雷帕霉素靶蛋白(mTOR)是磷酸肌醇-3-激酶(PI 3 K)信号转导的重要介质。PI 3 K信号传导调节B细胞发育、稳态和免疫应答。然而,mTOR介导的PI 3 K信号转导在B细胞中的功能和分子机制尚未完全阐明。在这里,我们表明sin 1(mTOR复合物2(mTORC 2)的重要成分)调节B细胞发育。Sin 1缺陷导致IL-7受体(il 7 r)和RAG重组酶(rag 1和rag 2)基因表达增加,导致增强的前B细胞存活和增强的V(D)J重组酶活性。我们进一步表明Akt 2通过调节FoxO 1磷酸化特异性介导B细胞中IL 7 r和rag基因表达的Sin 1-mTORC 2依赖性抑制。最后,我们证明了mTOR抑制剂雷帕霉素诱导rag表达并促进B细胞中的V(D)J重组。我们的研究揭示了Sin 1/mTORC 2-Akt 2信号轴是B细胞中FoxO 1转录活性的关键调节因子。
Mammalian target of rapamycin (mTOR) is an important mediator of phosphoinositol-3-kinase (PI3K) signaling. PI3K signaling regulates B cell development, homeostasis and immune responses. However, the function and molecular mechanism of mTOR mediated PI3K signaling in B cells has not been fully elucidated. Here we show that Sin1, an essential component of mTOR complex 2 (mTORC2), regulates B cell development. Sin1 deficiency results in increased IL-7 receptor (il7r) and RAG recombinase (rag1 and rag2) gene expression leading to enhanced pro-B cell survival and augmented V(D)J recombinase activity. We further show that Akt2 specifically mediates the Sin1-mTORC2 dependent suppression of il7r and rag gene expression in B cells by regulating FoxO1 phosphorylation. Finally, we demonstrate that the mTOR inhibitor rapamycin induces rag expression and promotes V(D)J recombination in B cells. Our study reveals that the Sin1/mTORC2-Akt2 signaling axis is a key regulator of FoxO1 transcriptional activity in B cells.
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