miR-16 and miR-26a target checkpoint kinases Wee1 and Chk1 in response to p53 activation by genotoxic stress.

miR-16 and miR-26a target checkpoint kinases Wee1 and Chk1 in response to p53 activation by genotoxic stress.
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DOI:
10.1038/cddis.2013.483
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发表时间:
2013-12-12
影响因子:
9
通讯作者:
--
中科院分区:
生物学1区
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肿瘤抑制因子 p53 通过充当转录因子来调节多种基因,是细胞周期停滞和细胞凋亡的关键调节因子。至少在某种程度上,这种控制是由 p53 通过调节众多 microRNA 的表达来实现的。我们鉴定了两种高表达的 microRNA,miR-16 和 miR-26a,它们的表达在基因毒性药物阿霉素诱导的检查点停滞期间受 p53 调节。重要的是,这些 miR 的靶标中有两个关键的检查点激酶 Chk1 和 Wee1。 p53 依赖性的 miR-16 和 miR-26a 表达水平增加导致肿瘤细胞的细胞周期停滞在 G1/S 期并增加细胞凋亡。引人注目的是,对乳腺癌和前列腺癌患者生存时间的生物信息学分析表明,mir-16 和 miR-26a 的共表达与更好的生存结果相关。总的来说,我们的数据提供了一种新机制,p53 至少部分通过上调 miR-16 和 miR-26a 抑制 Chk1 和 Wee1 表达,从而使肿瘤细胞对基因毒性疗法敏感。
The tumour suppressor p53 is a crucial regulator of cell cycle arrest and apoptosis by acting as a transcription factor to regulate a variety of genes. At least in part, this control is exerted by p53 via regulating expression of numerous microRNAs. We identified two abundantly expressed microRNAs, miR-16 and miR-26a, whose expression is regulated by p53 during the checkpoint arrest induced by the genotoxic drug, doxorubicin. Importantly, among the targets of these miRs are two critical checkpoint kinases, Chk1 and Wee1. The p53-dependent augmentation of miR-16 and miR-26a expression levels led to the cell cycle arrest of tumour cells in G1/S and increased apoptosis. Strikingly, the bioinformatics analysis of survival times for patients with breast and prostate cancers has revealed that co-expression of mir-16 and miR-26a correlated with a better survival outcome. Collectively, our data provide a novel mechanism whereby p53 represses Chk1 and Wee1 expression, at least partially, via upregulation of miR-16 and miR-26a and thus sensitizes tumour cells to genotoxic therapies.
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