The eIF4E RNA regulon promotes the Akt signaling pathway.

The eIF4E RNA regulon promotes the Akt signaling pathway.
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EIF4E RNA调节子促进了AKT信号通路。

DOI:
10.1083/jcb.200707018
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发表时间:
2008-04-07
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Borden KL
Borden KL
中科院分区:
其他
文献类型:
--
作者:
Culjkovic B;Tan K;Orolicki S;Amri A;Meloche S;Borden KL

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真核起始因子4E (Eukaryotic initiation factor 4E, eIF4E)促进细胞增殖,并能从凋亡刺激(如血清饥饿)中拯救细胞。然而,凋亡拯救的机制尚不清楚。在本研究中,我们证明了eIF4E过表达通过Akt导致存活信号增强,并且eIF4E需要Akt1来拯救血清缺失的成纤维细胞。此外,eIF4E的突变形式(W73A)具有信使RNA (mRNA)输出能力,但不促进翻译,与野生型eIF4E一样容易拯救细胞。我们发现eIF4E通过上调Nijmegen broken syndrome 1 (NBS1)介导Akt激活,NBS1是一种磷酸肌苷-3激酶- Akt通路上游激活因子。此外,eIF4E协同上调Akt通路下游效应子的表达,从而放大Akt信号传导作用。早幼粒细胞白血病蛋白(PML) eIF4E的负调节因子可抑制Akt的激活和凋亡拯救。这些PML活性可能至少部分是通过抑制eif4e介导的NBS1 mRNA输出而产生的。综上所述,eIF4E协调调节基因表达以增强Akt的激活,这是凋亡拯救所需的活性。
Eukaryotic initiation factor 4E (eIF4E) promotes cellular proliferation and can rescue cells from apoptotic stimuli such as serum starvation. However, the mechanisms underlying apoptotic rescue are not well understood. In this study, we demonstrate that eIF4E overexpression leads to enhanced survival signaling through Akt and that eIF4E requires Akt1 to rescue serum-deprived fibroblasts. Furthermore, a mutant form of eIF4E (W73A), which is messenger RNA (mRNA) export competent but does not promote translation, rescues cells as readily as wild-type eIF4E. We show that eIF4E mediates Akt activation via up-regulation of Nijmegen breakage syndrome 1 (NBS1), a phosphoinositide-3 kinase–Akt pathway upstream activator. Additionally, eIF4E coordinately up-regulates the expression of downstream effectors of the Akt pathway, thereby amplifying Akt signaling effects. A negative regulator of eIF4E, the promyelocytic leukemia protein (PML), suppresses Akt activation and apoptotic rescue. These PML activities likely arise, at least in part, through its inhibition of eIF4E-mediated NBS1 mRNA export. In summary, eIF4E coordinately regulates gene expression to potentiate Akt activation, an activity required for apoptotic rescue.
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