Functional role of eukaryotic translation initiation factor 4 gamma 1 (EIF4G1) in NSCLC.

Functional role of eukaryotic translation initiation factor 4 gamma 1 (EIF4G1) in NSCLC.
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真核翻译起始因子 4 γ 1 (EIF4G1) 在 NSCLC 中的功能作用

DOI:
10.18632/oncotarget.8168
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发表时间:
2016-04-26
期刊:
影响因子:
--
通讯作者:
Xu Z
Xu Z
中科院分区:
其他
文献类型:
--
作者:
Cao Y;Wei M;Li B;Liu Y;Lu Y;Tang Z;Lu T;Yin Y;Qin Z;Xu Z

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真核细胞翻译起始因子4-γ1(EIF4G1)与肿瘤的发生和发展有关。然而,它在调控非小细胞肺癌(NSCLC)肿瘤发展中的作用和潜在机制仍然很大程度上是未知的。在此,我们报道了EIF4G1在NSCLC细胞系和肿瘤组织中的表达水平远远高于同一患者的正常肺细胞和邻近正常组织中的表达水平。利用shRNA稳定下调EIF4G1的表达,我们发现EIF4G1是NSCLC细胞增殖、锚定非依赖性生长、迁移和侵袭所必需的。此外,沉默EIF4G1可诱导NSCLC细胞凋亡,并导致G0/G1期细胞周期停滞。为了确定EIF4G1在非小细胞肺癌细胞中的伴侣蛋白网络,我们发现泛素特异性蛋白酶10(USP10)可以直接与EIF4G1相互作用,同时对EIF4G1介导的功能起负调控作用。综上所述,我们的结果表明,EIF4G1在非小细胞肺癌的发生发展过程中发挥了癌蛋白的作用,这可能是肺癌治疗的一个新的和有前途的靶点。
Eukaryotic translation initiation factor 4 gamma 1(EIF4G1) is related to tumorigenesis and tumor progression. However, its role and the underlying mechanisms in the regulation of tumor development in non–small cell lung cancers (NSCLC) remain largely unknown. Here we report that the levels of EIF4G1 expression are much higher in NSCLC cell lines and tumor tissues than those in the normal lung cells and adjacent normal tissues from the same patients. Using shRNA to knock down EIF4G1 expression stably, we found EIF4G1 required for NSCLC cell proliferation, anchorage-independent growth, migration and invasion. Furthermore, silencing of EIF4G1 induces NSCLC cell apoptosis and causes G0/G1 cell cycle arrest. To identify the partner protein network of EIF4G1 in NSCLC cells, we found that Ubiquitin-specific protease 10 (USP10) can directly interacts with EIF4G1, while acting as a negative regulator for EIF4G1-mediated functions. Together, our results indicate that EIF4G1 functions as an oncoprotein during NSCLC development, which may represent a novel and promising therapeutic target in lung cancer.
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