eIF4E Phosphorylation in Prostate Cancer.

eIF4E Phosphorylation in Prostate Cancer.
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EIF4E前列腺癌的磷酸化。

DOI:
10.1016/j.neo.2018.04.003
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发表时间:
2018-06
期刊:
Neoplasia (New York, N.Y.)
影响因子:
--
通讯作者:
Ghosh PM
Ghosh PM
中科院分区:
其他
文献类型:
--
作者:
D'Abronzo LS;Ghosh PM

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前列腺癌(PCa)的进展涉及从内分泌到旁分泌的转变,最终由于细胞分子机制的改变而产生自分泌控制。解除对RNA翻译的调控对于肿瘤细胞的生长和增殖至关重要;因此,在癌症中经常观察到翻译机制的过度激活。PI3K/Akt/mTOR和Ras/MAPK是调控PCa进展的两条最重要的信号转导通路。这两条途径都集中在真核细胞翻译起始因子4E(EIF4E)上,eIF4E根据雷帕霉素(MTOR)的激活机制结合到蛋白支架eIF4G上,并被丝裂原激活的蛋白激酶(MAPK)相互作用的蛋白激酶(Mnk1/2)磷酸化。本文综述了eIF4E与许多mRNA5‘端甲基化结构(m7G-CAP)结合而在mRNA翻译启动中的作用,以及许多肿瘤细胞绕过这一机制的能力。激素治疗和化疗是晚期PCa患者最常用的两种疗法,研究表明eIF4E磷酸化在促进对这两种疗法的耐药性方面发挥了作用。EIF4E的磷酸化似乎提高了癌基因mRNAs的翻译速度,从而增加了肿瘤的致瘤性。
Prostate cancer (PCa) progression involves a shift from endocrine to paracrine and eventually autocrine control resulting from alterations in molecular mechanisms in the cells. Deregulation of RNA translation is crucial for tumor cells to grow and proliferate; therefore, overactivation of the translation machinery is often observed in cancer. The two most important signal transduction pathways regulating PCa progression are PI3K/Akt/mTOR and Ras/MAPK. These two pathways converge on the eukaryotic translation initiation factor 4E (eIF4E) which binds to the protein scaffold eIF4G upon mechanistic target of rapamycin (mTOR) activation and is phosphorylated by the mitogen-activated protein kinase (MAPK) interacting protein kinases (Mnk1/2). This review describes the role of eIF4E in mRNA translation initiation mediated by its binding to the methylated 5′ terminal structure (m7G-cap) of many mRNAs, and the ability of many tumor cells to bypass this mechanism. Hormonal therapy and chemotherapy are two of the most prevalent therapies used in patients with advanced PCa, and studies have implicated a role for eIF4E phosphorylation in promoting resistance to both these therapies. It appears that eIF4E phosphorylation enhances the rate of translation of oncogene mRNAs to increase tumorigenicity.
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