Differential effects on ARF stability by normal versus oncogenic levels of c-Myc expression.

Differential effects on ARF stability by normal versus oncogenic levels of c-Myc expression.
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正常与致癌水平的 c-Myc 表达对 ARF 稳定性的不同影响。

DOI:
10.1016/j.molcel.2013.05.006
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发表时间:
2013-07-11
期刊:
影响因子:
16
通讯作者:
Gu, Wei
Gu, Wei
中科院分区:
生物学1区
文献类型:
--
作者:
Chen, Delin;Kon, Ning;Zhong, Jiayun;Zhang, Pingzhao;Yu, Long;Gu, Wei

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ARF通过激活P53反应抑制c-Myc过表达引起的细胞异常生长。然而,ARF在不影响其正常生理功能的情况下特异性地抑制c-Myc的致癌潜能的确切机制尚不清楚。在这里,我们表明,低水平的c-Myc表达促进细胞增殖,而高水平的c-Myc表达通过激活ARF-P53反应抑制细胞增殖。虽然在这两种情况下都诱导了ARF的mRNA水平,但只有当c-Myc过表达抑制了ULF介导的ARF降解时,ARF蛋白的积累才会发生。此外,在DNA损伤时,通过Ulf介导的泛素化来降低ARF的水平。通过c-Myc的过度表达阻断ARF的降解可显著刺激细胞的凋亡反应。我们的研究表明,ARF的稳定性控制对于区分正常(低)和致癌(高)水平的c-Myc表达是至关重要的,并表明c-Myc水平对Ulf介导的ARF泛素化的差异效应在癌基因诱导的应激反应中起到了屏障作用。
ARF suppresses aberrant cell growth upon c-Myc overexpression through activating p53 responses. Nevertheless, the precise mechanism by which ARF specifically, restrains the oncogenic potential of c-Myc without affecting its normal physiological function is not well understood. Here, we show that low levels of c-Myc expression stimulate cell proliferation whereas high levels inhibit through activating the ARF-p53 response. Although the mRNA levels of ARF are induced under both scenarios, the accumulation of ARF protein occurs only when ULF-mediated degradation of ARF is inhibited by c-Myc overexpression. Moreover, the levels of ARF are reduced through ULF-mediated ubiquitination upon DNA damage. Blocking ARF degradation by c-Myc overexpression dramatically stimulates the apoptotic responses. Our study reveals that ARF stability control is crucial for differentiating normal (low) vs. oncogenic (high) levels of c-Myc expression and suggests that differential effects on ULF- mediated ARF ubiquitination by c-Myc levels act as a barrier in oncogene-induced stress responses.
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