The oncogene eIF4E reprograms the nuclear pore complex to promote mRNA export and oncogenic transformation.

The oncogene eIF4E reprograms the nuclear pore complex to promote mRNA export and oncogenic transformation.
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DOI:
10.1016/j.celrep.2012.07.007
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发表时间:
2012-08-30
期刊:
影响因子:
8.8
通讯作者:
Borden KL
Borden KL
中科院分区:
生物学1区
文献类型:
--
作者:
Culjkovic-Kraljacic B;Baguet A;Volpon L;Amri A;Borden KL

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真核翻译起始因子eIF4E是一种有效的癌基因,可以促进特定转录本的核输出和翻译。在这里,我们发现eIF4E改变了核孔复合体(NPC)的细胞质表面,从而导致eIF4E靶向mRNAs的mRNA输出增加。具体地说,eIF4E大大减少了鼻咽癌细胞质纤维的主要成分RanBP2,重新定位了相关的核孔蛋白Nup214,并提高了RanBP1和RNA输出因子Gle1和DDX19。对eIF4E的遗传或药物抑制会阻碍这些作用。RanBP2的过表达特异性地抑制eIF4E的mRNA输出途径,并损害eIF4E的致癌转化。RanBP2细胞质原纤维可能减缓了关键输出因子向细胞核的释放/再循环。EIF4E通过间接降低RanBP2的水平来克服这一抑制机制。从全球范围来看,这些研究表明,对NPC重新编程是癌基因可以利用细胞增殖能力的一种手段。
The eukaryotic translation initiation factor eIF4E is a potent oncogene that promotes the nuclear export and translation of specific transcripts. Here, we discovered that eIF4E alters the cytoplasmic face of the nuclear pore complex (NPC) which leads to enhanced mRNA export of eIF4E target mRNAs. Specifically, eIF4E substantially reduces the major component of the cytoplasmic fibrils of the NPC, RanBP2, relocalizes an associated nucleoporin Nup214, and elevates RanBP1 and the RNA export factors, Gle1 and DDX19. Genetic or pharmacological inhibition of eIF4E impedes these effects. RanBP2 overexpression specifically inhibits the eIF4E mRNA export pathway and impairs oncogenic transformation by eIF4E. The RanBP2 cytoplasmic fibrils likely slow the release/recycling of critical export factors to the nucleus. eIF4E overcomes this inhibitory mechanism by indirectly reducing levels of RanBP2. More globally, these studies suggest that reprogramming the NPC is a means by which oncogenes can harness the proliferative capacity of the cell.
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