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miR-612 negatively regulates colorectal cancer growth and metastasis by targeting AKT2.
Cell Death & Disease 2015 July 10
Colorectal cancer (CRC) is one of the most common cancers worldwide, with a particularly high incidence in developed countries. Distant metastasis and recurrence are the main causes of CRC-related deaths. MicroRNAs (miRNAs) in the serum make them potential biomarkers for cancers, as reported in serum or tumor tissues from CRC patients. In this study, we found that miR-612 expression was significantly lower in CRC tissues or cells compared with peritumor tissues or normal cells, and lower in metastatic CRC specimens compared with non-metastatic specimens, whereas AKT2 exhibited opposite trend. Gain-of-function and loss-of-function assays showed that miR-612 inhibited CRC cell proliferation and migration in vitro by Cell Counting Kit-8 and transwell assays. Further analysis revealed that miR-612 directly suppressed AKT2, which in turn inhibited the downstream epithelial-mesenchymal transition-related signaling pathway. These results were additionally validated in vivo by tumorigenesis and liver metastasis experiments. The results of this study suggested a critical role of miR-612 in the development of CRC.
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