Negative regulation of tumor suppressor p53 by microRNA miR-504.

Negative regulation of tumor suppressor p53 by microRNA miR-504.
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DOI:
10.1016/j.molcel.2010.05.027
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发表时间:
2010-06-11
期刊:
影响因子:
16
通讯作者:
Feng Z
Feng Z
中科院分区:
生物学1区
文献类型:
--
作者:
Hu W;Chan CS;Wu R;Zhang C;Sun Y;Song JS;Tang LH;Levine AJ;Feng Z

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抑癌基因P53在肿瘤预防中发挥着核心作用。P53蛋白水平和活性在细胞中受到严格而复杂的调节,以维持P53的正常功能。MicroRNAs在基因表达调控中起着关键作用。在这里,我们报告了通过microRNA miR-504对p53的调节。MIR-504通过直接与P53 3‘-UTR中的两个位点结合,对人P53起负调控作用。MiR-504的过表达降低了细胞中P53蛋白的水平和功能,包括P53转录活性、P53介导的细胞凋亡和应激反应中的细胞周期停滞,进而促进了体内细胞的成瘤。这些结果表明miR-504对P53的直接负调控是细胞中P53调节的一种机制,这突显了microRNAs在肿瘤发生中的重要性。
Tumor suppressor p53 plays a central role in tumor prevention. p53 protein levels and activity are under a tight and complex regulation in cells to maintain the proper function of p53. microRNAs play a key role in the regulation of gene expression. Here we report the regulation of p53 through microRNA miR-504. miR-504 acts as a negative regulator of human p53 through its direct binding to two sites in p53 3′-UTR. Overexpression of miR-504 decreases p53 protein levels and functions in cells, including p53 transcriptional activity, p53-mediated apoptosis and cell cycle arrest in response to stress, and furthermore, promotes tumorigenecity of cells in vivo. These results demonstrate the direct negative regulation of p53 by miR-504 as a mechanism for p53 regulation in cells, which highlights the importance of microRNAs in tumorigenesis.
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