Eukaryotic translation elongation factor 1-alpha 1 inhibits p53 and p73 dependent apoptosis and chemotherapy sensitivity.

Eukaryotic translation elongation factor 1-alpha 1 inhibits p53 and p73 dependent apoptosis and chemotherapy sensitivity.
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DOI:
10.1371/journal.pone.0066436
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Irwin MS
Irwin MS
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Blanch A;Robinson F;Watson IR;Cheng LS;Irwin MS

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p53 转录因子家族是细胞增殖和死亡的关键调节因子。在本报告中,我们确定真核翻译延伸因子 1-α1 (eEF1A1) 是一种新型 p53 和 p73 相互作用蛋白。先前的研究表明,eEF1A1 在癌症中具有翻译独立的作用。我们报告 eEF1A1 的过度表达特异性抑制 p53、p73 和化疗诱导的细胞凋亡,从而导致化疗耐药。短干扰 RNA 介导的 eEF1A1 沉默会增加携带野生型 p53 的细胞系的化学敏感性,但不会增加 p53 缺失细胞的化学敏感性。此外,eEF1A1 的沉默部分挽救了 p53 或 p73 敲低所观察到的化疗耐药性,表明 eEF1A1 是 p53 和 p73 促凋亡功能的负调节因子。因此,在 p53 家族信号传导的背景下,eEF1A1 具有抗凋亡特性。这些发现确定了 eEF1A1 调节 p53 蛋白家族的新机制,为使肿瘤对化疗敏感的潜在靶标提供了更多见解。
The p53 family of transcription factors is a key regulator of cell proliferation and death. In this report we identify the eukaryotic translation elongation factor 1-alpha 1 (eEF1A1) to be a novel p53 and p73 interacting protein. Previous studies have demonstrated that eEF1A1 has translation-independent roles in cancer. We report that overexpression of eEF1A1 specifically inhibits p53-, p73- and chemotherapy-induced apoptosis resulting in chemoresistance. Short-interfering RNA-mediated silencing of eEF1A1 increases chemosensitivity in cell lines bearing wild type p53, but not in p53 null cells. Furthermore, silencing of eEF1A1 partially rescues the chemoresistance observed in response to p53 or p73 knockdown, suggesting that eEF1A1 is a negative regulator of the pro-apoptotic function of p53 and p73. Thus, in the context of p53-family signaling, eEF1A1 has anti-apoptotic properties. These findings identify a novel mechanism of regulation of the p53 family of proteins by eEF1A1 providing additional insight into potential targets to sensitize tumors to chemotherapy.
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