Estrogen-induced upregulation and 3'-UTR shortening of CDC6.

Estrogen-induced upregulation and 3'-UTR shortening of CDC6.
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雌激素引起的上调和3'-UTR缩短Cdc6。

DOI:
10.1093/nar/gks855
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发表时间:
2012-11
影响因子:
14.9
通讯作者:
Erson-Bensan AE
Erson-Bensan AE
中科院分区:
生物学2区
文献类型:
--
作者:
Akman BH;Can T;Erson-Bensan AE

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通过选择性聚腺苷酸化(APA)缩短mrna的3 ' -非翻译区(UTR)对基因表达具有重要影响。通过使用近端APA位点并切换到较短的3 ' - utr,增殖细胞避免了mirna介导的抑制。这种APA和3 ' -UTR缩短事件可能解释了在癌细胞中观察到的一些原癌基因激活病例的基础。在这项研究中,我们研究了17 β-雌二醇(E2),一个强大的增殖信号,是否诱导APA和3 ' -UTR缩短激活雌激素受体阳性(ER+)乳腺癌的原癌基因。我们最初基于探针的独立表达阵列筛选表明,E2处理后,DNA复制的基本调节因子CDC6(细胞分裂周期6)的上调和3 ' -UTR缩短。我们进一步证实了CDC6的E2和er依赖性上调和3'UTR缩短,这导致CDC6蛋白水平升高和BrdU掺入增加。因此,miRNA结合预测和双荧光素酶测定表明,CDC6的3 ' -UTR缩短是避免3 ' -UTR依赖性负调控的机制。因此,我们通过E2在ER+细胞中的增殖作用证明了CDC6 APA的诱导作用,并为APA的复杂调控提供了新的见解。e2诱导的APA可能是e2反应性基因表达的一个重要但被忽视的机制。
3′-Untranslated region (UTR) shortening of mRNAs via alternative polyadenylation (APA) has important ramifications for gene expression. By using proximal APA sites and switching to shorter 3′-UTRs, proliferating cells avoid miRNA-mediated repression. Such APA and 3′-UTR shortening events may explain the basis of some of the proto-oncogene activation cases observed in cancer cells. In this study, we investigated whether 17 β-estradiol (E2), a potent proliferation signal, induces APA and 3′-UTR shortening to activate proto-oncogenes in estrogen receptor positive (ER+) breast cancers. Our initial probe based screen of independent expression arrays suggested upregulation and 3′-UTR shortening of an essential regulator of DNA replication, CDC6 (cell division cycle 6), upon E2 treatment. We further confirmed the E2- and ER-dependent upregulation and 3′UTR shortening of CDC6, which lead to increased CDC6 protein levels and higher BrdU incorporation. Consequently, miRNA binding predictions and dual luciferase assays suggested that 3′-UTR shortening of CDC6 was a mechanism to avoid 3′-UTR-dependent negative regulations. Hence, we demonstrated CDC6 APA induction by the proliferative effect of E2 in ER+ cells and provided new insights into the complex regulation of APA. E2-induced APA is likely to be an important but previously overlooked mechanism of E2-responsive gene expression.
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