Journal
MOLECULAR CANCER
Volume 12, Issue -, Pages -Publisher
BIOMED CENTRAL LTD
DOI: 10.1186/1476-4598-12-30
Keywords
microRNA; Colorectal carcinoma; PTEN; Invasion
Categories
Funding
- Medical Scientific Research Foundation of Department of Health of Guangdong Province [A2012431]
- Scientific Research Foundation of Guangdong Medical College [24]
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Background: Colorectal carcinoma (CRC) is one of the leading causes of cancer-related mortality worldwide. MicroRNAs (miRNAs, miRs) play important roles in carcinogenesis. MiR-32 has been shown to be upregulated in CRC. In this study, we identified the potential effects of miR-32 on some important biological properties of CRC cells, and clarified the regulation of PTEN by miR-32. Methods: The effect of miR-32 on PTEN expression was assessed in CRC cell lines with miR-32 mimics/inhibitor to increase/decrease miR-32 expression. Furthermore, the roles of miR-32 in regulating CRC cells biological properties were analyzed with miR-32 mimics/inhibitor-transfected cells. The 3'-untranslated region (3'-UTR) of PTEN combined with miR-32 was verified by dual-luciferase reporter assay. Results: Gain-of-function and loss-of-function studies showed that overexpression of miR-32 promoted SW480 cell proliferation, migration, and invasion, reduced apoptosis, and resulted in downregulation of PTEN at a posttranscriptional level. However, miR-32 knock-down inhibited these processes in HCT-116 cells and enhanced the expression of PTEN protein. In addition, we further identified PTEN as the functional downstream target of miR-32 by directly targeting the 3'-UTR of PTEN. Conclusions: Our results demonstrated that miR-32 was involved in tumorigenesis of CRC at least in part by suppression of PTEN.
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