Genetic dissection of the oncogenic mTOR pathway reveals druggable addiction to translational control via 4EBP-eIF4E.

Genetic dissection of the oncogenic mTOR pathway reveals druggable addiction to translational control via 4EBP-eIF4E.
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DOI:
10.1016/j.ccr.2010.01.021
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发表时间:
2010-03-16
期刊:
影响因子:
50.3
通讯作者:
Ruggero D
Ruggero D
中科院分区:
医学1区
文献类型:
--
作者:
Hsieh AC;Costa M;Zollo O;Davis C;Feldman ME;Testa JR;Meyuhas O;Shokat KM;Ruggero D

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我们从遗传学角度剖析了mTOR信号传导最突出的下游翻译组分对Akt驱动的淋巴瘤发生的贡献。虽然rpS6的磷酸化对于癌症形成是不利的,但4EBP-eIF4E对帽依赖性翻译、细胞生长、癌症起始和进展发挥显著控制。这种作用至少部分通过4EBP依赖性控制Mcl-1表达介导,Mcl-1是一种关键的抗凋亡蛋白。通过使用mTOR的活性位点抑制剂PP242,我们在雷帕霉素耐药肿瘤中显示出显著的治疗反应。PP242的治疗益处通过抑制mTORC 1依赖性4EBP-eIF4E超活化介导。因此,mTOR下游的4EBP-eIF4E轴是翻译控制和Akt介导的肿瘤发生的可药用介质,其对人类癌症的治疗具有重要意义。
We genetically dissect the contribution of the most prominent downstream translational components of mTOR signaling toward Akt-driven lymphomagenesis. While phosphorylation of rpS6 is dispensable for cancer formation, 4EBP-eIF4E exerts significant control over cap-dependent translation, cell growth, cancer initiation, and progression. This effect is mediated at least in part through 4EBP-dependent control of Mcl-1 expression, a key antiapoptotic protein. By using an active site inhibitor of mTOR, PP242, we show a marked therapeutic response in rapamycin-resistant tumors. The therapeutic benefit of PP242 is mediated through inhibition of mTORC1-dependent 4EBP-eIF4E hyperactivation. Thus, the 4EBP-eIF4E axis downstream of mTOR is a druggable mediator of translational control and Akt-mediated tumorigenesis that has important implications for the treatment of human cancers.
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