Rheb1 is required for mTORC1 and myelination in postnatal brain development.

Rheb1 is required for mTORC1 and myelination in postnatal brain development.
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Rheb1 是产后大脑发育中 mTORC1 和髓鞘形成所必需的。

DOI:
10.1016/j.devcel.2010.11.020
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发表时间:
2011-01-18
期刊:
影响因子:
11.8
通讯作者:
Xiao, Bo
Xiao, Bo
中科院分区:
生物学1区
文献类型:
--
作者:
Zou, Jia;Zhou, Liang;Du, Xiao-Xia;Ji, Yifei;Xu, Jia;Tian, Junlong;Jiang, Wanxiang;Zou, Yi;Yu, Shouyang;Gan, Lingxue;Luo, Maowen;Yang, Qiaona;Cui, Yiyuan;Yang, Wanchun;Xia, Xiaoqiang;Chen, Mina;Zhao, Xia;Shen, Ying;Chen, Po Yu;Worley, Paul F.;Xiao, Bo

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mTor激酶参与细胞生长、增殖和分化。mTor激活剂Rheb 1和Rheb 2的作用尚未在体内确定。在这里,我们报告说,Rheb 1,而不是Rheb 2,是胚胎存活和mTORC 1信号的关键。胚胎神经祖细胞中Rheb 1的缺失消除了发育中大脑中的mTORC 1信号传导,并增加了mTORC 2信号传导。值得注意的是,这些Rheb 1f/f,Nes-cre小鼠的胚胎和出生后早期脑发育似乎非常正常,但髓鞘形成明显不足。Rheb 1转基因在神经祖细胞中的条件性表达增加mTORC 1活性并促进脑中的髓鞘形成。此外,Rheb 1转基因挽救了Rheb 1f/f、Nes-cre小鼠中的mTORC 1信号传导和髓鞘形成不足。我们的研究表明,Rheb 1是必不可少的mTORC 1信号和髓鞘在大脑中,并表明mTORC 1信号在选择性细胞适应中发挥作用,而不是一般的细胞活力。
mTor kinase is involved in cell growth, proliferation, and differentiation. The roles of mTor activators, Rheb1 and Rheb2, have not been established in vivo. Here, we report that Rheb1, but not Rheb2, is critical for embryonic survival and mTORC1 signaling. Embryonic deletion of Rheb1 in neural progenitor cells abolishes mTORC1 signaling in developing brain and increases mTORC2 signaling. Remarkably, embryonic and early postnatal brain development appears grossly normal in these Rheb1f/f, Nes-cre mice with the notable exception of deficits of myelination. Conditional expression of Rheb1 transgene in neural progenitors increases mTORC1 activity and promotes myelination in the brain. In addition, the Rheb1 transgene rescues mTORC1 signaling and hypomyelination in the Rheb1f/f, Nes-cre mice. Our study demonstrates that Rheb1 is essential for mTORC1 signaling and myelination in the brain, and suggests that mTORC1 signaling plays a role in selective cellular adaptations, rather than general cellular viability.
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