MiR-145 regulates epithelial to mesenchymal transition of breast cancer cells by targeting Oct4.

MiR-145 regulates epithelial to mesenchymal transition of breast cancer cells by targeting Oct4.
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DOI:
10.1371/journal.pone.0045965
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Zhang N
Zhang N
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Hu J;Guo H;Li H;Liu Y;Liu J;Chen L;Zhang J;Zhang N

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MiR-145可以调节肿瘤生长、凋亡、迁移和侵袭。在我们目前的研究中,我们研究了它在上皮间质转化(EMT)中的作用。与T1&2期相比,T3&4期乳腺肿瘤组织中miR-145的表达降低。 miR-145 的过度表达模拟了 E-钙粘蛋白蛋白水平的增强,并抑制了 α-SMA 和纤连蛋白的蛋白水平,表明其在 EMT 发生中的抑制作用。机制研究表明,miR-145 模拟物抑制 Oct4 表达,而 miR-145 抑制剂则增强其表达。 Oct4 的过表达逆转了 miR-145 调节的 EMT 标记物的表达,表明 Oct4 介导了 miR-145 的抑制作用。 MiR-145 可以抑制 Snail、ZEB1 和 ZEB2 的表达,而 Oct4 的过表达可以挽救这种效果。此外,Oct-4 诱导转录因子 Snail、ZEB1 和 ZEB2 的过度表达是由 β-catenin 介导的。 Slug 和 Twist 的表达不被 miR-145/Oct4 改变。综上所述,我们的结果揭示了 miR-145 在 EMT 中的新作用。它通过阻断 Oct4 和下游转录因子 Snail、ZEB1 和 ZEB2 的表达来抑制 EMT。
MiR-145 could regulate tumor growth, apoptosis, migration, and invasion. In our present study, we investigated its role in epithelial-mesenchymal transition (EMT). Expression of miR-145 was decreased in breast tumor tissues at T3&4 stages in comparison with those at T1&2. Over-expression of miR-145 mimics enhanced protein levels of E-cadherin and dampened those of α-SMA and Fibronectin, indicative of its inhibitory role in EMT occurrence. Mechanistic studies showed that miR-145 mimics inhibited Oct4 expression and miR-145 inhibitor enhanced it. Over-expression of Oct4 reversed miR-145-regulated expression of EMT markers, suggesting that Oct4 mediated the inhibitory effects of miR-145. MiR-145 could inhibite the expression of Snail, ZEB1, and ZEB2, while over-expression of Oct4 rescued the effects. Furthermore, Oct-4 induced over-expression of transcription factor Snail, ZEB1 and ZEB2 was mediated by β-catenin. Expression of Slug and Twist were not altered by miR-145/Oct4. Taken together, our results have revealed a novel role of miR-145 on EMT. It inhibits EMT by blocking the expression of Oct4, and downstream transcriptional factors, Snail, ZEB1 and ZEB2.
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