Regulatory roles of microRNA‑708 and microRNA‑31 in proliferation, apoptosis and invasion of colorectal cancer cells

Lei,San-Lin; Zhao,Hua; Yao,Hong-Liang; Chen,Yong; Lei,Zhen-Dong; Liu,Kui-Jie; Yang,Qun

doi:10.3892/ol.2014.2328

Regulatory roles of microRNA‑708 and microRNA‑31 in proliferation, apoptosis and invasion of colorectal cancer cells

Authors:
- San-Lin Lei
- Hua Zhao
- Hong-Liang Yao
- Yong Chen
- Zhen-Dong Lei
- Kui-Jie Liu
- Qun Yang
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Affiliations: Department of General Surgery, The Second Xiangya Hospital of Central South University, Changsha, Hunan 410011, P.R. China, Department of Oncology, The Second Xiangya Hospital of Central South University, Changsha, Hunan 410011, P.R. China
Published online on: July 9, 2014 https://doi.org/10.3892/ol.2014.2328
Pages: 1768-1774

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Abstract

MicroRNAs (miRs) function as key regulators of gene expression and their deregulation is associated with the carcinogenesis of various cancers. In the present study, the aim was to validate the potential roles and regulatory mechanisms of miR‑708 and miR‑31 in colorectal cancer (CRC) cells. miR‑708 and miR‑31 were found to be highly expressed in five CRC tissue samples. Functional studies showed that the inhibition of miR‑708 and miR‑31 inhibited cell proliferation and invasion, however, promoted apoptosis in vitro. Subsequently, it was identified that miR‑708 and miR‑31 directly target cyclin‑dependent kinase inhibitor 2B (CDKN2B) by binding to the 3' untranslated region, which suppresses the CDKN2B protein levels. In addition, the CDKN2B protein levels were significantly reduced when there was high miR‑708 and miR‑31 expression in the CRC tissue samples. The results indicate that miR‑31 and miR‑708 function in an oncogenic manner in CRC development, and inhibition of the two miRs may be used as a therapeutic strategy for patients with CRC.

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