Abstract
MicroRNAs (miRNAs) are increasingly implicated in regulating tumor malignance through their capacity to coordinately repress expression of tumor-related genes. Here, we show that overexpression of miR-194 in lung cancer cell lines, results in suppressing metastasis of lung cancer cells, while inhibiting its expression through ‘miRNA sponge’ promotes the cancer cells to metastasize. miR-194 expression is also found to be in strongly negative association with metastasis in clinical specimens of non-small cell lung cancer. We demonstrate that miR-194 directly targets both BMP1 and p27kip1. The resulting downregulation of BMP1 leads to suppression of TGFβ activity and, thus, to downregulation of the expression of key oncogenic genes (matrix metalloproteinases MMP2 and MMP9). This leads, in turn, to decreased tumor invasion. In addition, the miRNA-194-induced suppression of p27kip1 activates the RhoA pathway, producing enhanced development of actin stress fibers and impaired migration of cancer cells. These findings reveal two structurally independent but functionally linked branches of the regulatory and signaling pathway that together provide a bridge between the metastasis-depressing miRNA and the key genes that govern the malignancy of lung cancers.
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Acknowledgements
We owe gratefully to two anonymous reviewers whose constructively critical comments have been very helpful to improve the quality and presentation of an earlier version of the paper. We thank the unnamed patients for their consent to allow us to use the lung tissue samples in this research. This work was supported by the National Basic Research Program of China (2012CB316505) and National Natural Science Foundation of China (81172006). ZWL is also supported by the Leverhulme Trust (UK).
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Wu, X., Liu, T., Fang, O. et al. miR-194 suppresses metastasis of non-small cell lung cancer through regulating expression of BMP1 and p27kip1. Oncogene 33, 1506–1514 (2014). https://doi.org/10.1038/onc.2013.108
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DOI: https://doi.org/10.1038/onc.2013.108
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