MicroRNA-182 targets SMAD7 to potentiate TGFβ-induced epithelial-mesenchymal transition and metastasis of cancer cells.

MicroRNA-182 targets SMAD7 to potentiate TGFβ-induced epithelial-mesenchymal transition and metastasis of cancer cells.
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MicroRNA-182靶向SMAD7增强TGFβ诱导的癌细胞上皮间质转化和转移

DOI:
10.1038/ncomms13884
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发表时间:
2016-12-20
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
文献类型:
--
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转化生长因子β(transforming growth factor β,TGFβ)通路在肿瘤细胞上皮间质转化(epithelial-mesenchymal transition,EMT)和转移过程中起着重要作用。SMAD 7既是转录靶点,也是TGFβ信号传导的负调节因子,因此介导可能潜在抑制癌细胞的TGFβ反应的负反馈环。然而,在这里,我们表明TGFβ处理诱导SMAD 7转录,但在一组癌细胞中不诱导其蛋白水平。机制研究表明,TGFβ激活microRNA-182(miR-182)的表达,从而抑制SMAD 7蛋白。miR-182沉默导致SMAD 7在TGFβ处理时上调,并防止TGFβ诱导的EMT和癌细胞的侵袭。miR-182过表达促进乳腺肿瘤侵袭和TGFβ诱导的骨转移破骨细胞生成此外,在人类肿瘤样品中,miR-182表达与SMAD 7蛋白呈负相关。因此,我们的数据揭示了miR-182介导的TGFβ自我约束的破坏,并提供了一种机制来解释转移性癌细胞中释放的TGFβ反应。 SMAD 7是一个转录靶点,也是TGFβ信号传导的负调节因子,形成负反馈环。在这里,作者表明,在癌细胞中,TGFβ激活抑制SMAD 7蛋白的microRNA-182的表达,促进TGFβ介导的乳腺肿瘤侵袭和骨转移。
The transforming growth factor β (TGFβ) pathway plays critical roles during cancer cell epithelial-mesenchymal transition (EMT) and metastasis. SMAD7 is both a transcriptional target and a negative regulator of TGFβ signalling, thus mediating a negative feedback loop that may potentially restrain TGFβ responses of cancer cells. Here, however, we show that TGFβ treatment induces SMAD7 transcription but not its protein level in a panel of cancer cells. Mechanistic studies reveal that TGFβ activates the expression of microRNA-182 (miR-182), which suppresses SMAD7 protein. miR-182 silencing leads to SMAD7 upregulation on TGFβ treatment and prevents TGFβ-induced EMT and invasion of cancer cells. Overexpression of miR-182 promotes breast tumour invasion and TGFβ-induced osteoclastogenesis for bone metastasis. Furthermore, miR-182 expression inversely correlates with SMAD7 protein in human tumour samples. Therefore, our data reveal the miR-182-mediated disruption of TGFβ self-restraint and provide a mechanism to explain the unleashed TGFβ responses in metastatic cancer cells. SMAD7 is a transcriptional target and a negative regulator of TGFβ signalling forming a negative feedback loop. Here the authors show that in cancer cells TGFβ activates the expression of microRNA-182 that suppresses SMAD7 protein, promoting TGFβ-mediated breast tumour invasion and bone metastasis.
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