PRAS40 plays a pivotal role in protecting against stroke by linking the Akt and mTOR pathways.

PRAS40 plays a pivotal role in protecting against stroke by linking the Akt and mTOR pathways.
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PRAS40 通过连接 Akt 和 mTOR 通路在预防中风方面发挥关键作用

DOI:
10.1016/j.nbd.2014.02.006
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发表时间:
2014-06
影响因子:
6.1
通讯作者:
Zhao H
Zhao H
中科院分区:
医学1区
文献类型:
--
作者:
Xiong X;Xie R;Zhang H;Gu L;Xie W;Cheng M;Jian Z;Kovacina K;Zhao H

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40 kDa的富含Pro的Akt底物(PRAS40)不仅是蛋白激酶Akt的底物,而且是mTOR复合体1(MTORC1)的组成部分,连接Akt和mTOR通路。我们通过慢病毒过量表达PRAS40的大鼠和PRAS40基因敲除的小鼠(PRAS40KO),研究了PRAS40在脑缺血中的潜在保护作用及其机制。我们的结果表明,PRAS40基因转移通过促进Akt、FKHR(FOXO1)、PRAS40和mTOR的磷酸化来减少大鼠的脑梗塞范围。相反,PRAS40KO增加了梗塞面积。虽然PRAS40KO在正常情况下不改变Akt和mTor通路中磷酸化蛋白的基线水平,但接受卒中治疗的PRAS40KO在mTOR通路中显示出p-S6K和p-S6的蛋白质水平降低,但在Akt通路中没有p-Akt或p-PTEN的蛋白质水平。此外,免疫共沉淀表明,在PRAS40 KO中,Akt和mTOR之间的相互作用较少。总而言之,PRAS40似乎通过将细胞信号从Akt转换为mTor来减少脑损伤。
The proline-rich Akt substrate of 40 kDa (PRAS40) protein is not only a substrate of the protein kinase Akt but also a component of the mTOR complex 1 (mTORC1), thus it links the Akt and the mTOR pathways. We investigated the potential protective role of PRAS40 in cerebral ischemia and its underlying mechanisms by using rats with lentiviral over-expression of PRAS40 and mice with PRAS40 gene knockout (PRAS40 KO). Our results show that gene transfer of PRAS40 reduced infarction size in rats by promoting phosphorylation of Akt, FKHR (FOXO1), PRAS40, and mTOR. In contrast, PRAS40 KO increased infarction size. Although the PRAS40 KO under normal condition did not alter baseline levels of phosphorylated proteins in the Akt and mTOR pathways, PRAS40 KO that underwent stroke exhibited reduced protein levels of p-S6K and p-S6 in the mTOR pathway but not p-Akt, or p-PTEN in the Akt pathway. Furthermore, co-immunoprecipitation suggests that there were less interactive effects between Akt and mTOR in the PRAS40 KO. In conclusion, PRAS40 appears to reduce brain injury by converting cell signaling from Akt to mTOR.
肾癌细胞中钙调磷酸酶抑制剂诱导和 Ras 介导的 VEGF 过度表达涉及 mTOR 通过 PRAS40 的调节。
DOI: 10.1371/journal.pone.0023919
发表时间: 2011
期刊: PloS one
影响因子: 3.7
作者:
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影响因子: 4.8
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Fonseca, Bruno D.;Smith, Ewan M.;Proud, Christopher G.
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DOI: 10.1006/nbdi.2002.0553
发表时间: 2002-12-01
影响因子: 6.1
作者:
Friguls, B;Petegnief, V;Planas, AM
通讯作者: Planas, AM