mTOR signaling: implications for cancer and anticancer therapy.

mTOR signaling: implications for cancer and anticancer therapy.
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DOI:
10.1038/sj.bjc.6602902
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发表时间:
2006-01-30
影响因子:
8.8
通讯作者:
Sonenberg, N
Sonenberg, N
中科院分区:
医学1区
文献类型:
--
作者:
Petroulakis, E;Mamane, Y;Le Bacquer, O;Shahbazian, D;Sonenberg, N

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越来越多的证据表明,通过翻译起始因子复合物eIF4F,蛋白质合成失调与肿瘤发生有关。该复合物的组分通常在大量癌症中过表达,并在实验系统中促进恶性转化。mTOR通过磷酸化eIF4F复合物的阻遏物(eIF4E结合蛋白)来影响eIF4F复合物的活性。免疫抑制剂雷帕霉素特异性抑制mTOR活性并延缓癌症生长。重要的是,mTOR上游负调控因子的突变会导致错构瘤、血管瘤和对雷帕霉素治疗敏感的癌症。这些突变导致eIF4F形成增加,从而增强翻译起始和细胞生长。因此,通过靶向mTOR信号传导途径抑制翻译起始正在成为一种有前途的治疗选择。
Mounting evidence links deregulated protein synthesis to tumorigenesis via the translation initiation factor complex eIF4F. Components of this complex are often overexpressed in a large number of cancers and promote malignant transformation in experimental systems. mTOR affects the activity of the eIF4F complex by phosphorylating repressors of the eIF4F complex, the eIF4E binding proteins. The immunosuppressant rapamycin specifically inhibits mTOR activity and retards cancer growth. Importantly, mutations in upstream negative regulators of mTOR cause hamartomas, haemangiomas, and cancers that are sensitive to rapamycin treatment. Such mutations lead to increased eIF4F formation and consequently to enhanced translation initiation and cell growth. Thus, inhibition of translation initiation through targeting the mTOR-signalling pathway is emerging as a promising therapeutic option.
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