miR-1182 attenuates gastric cancer proliferation and metastasis by targeting the open reading frame of hTERT.
By: Dan Zhang, Yu-Feng Xiao, Jian-Wei Zhang, Rui Xie, Chang-Jiang Hu, Bo Tang, Su-Min Wang, Yu-Yun Wu, Ning-Bo Hao, Shi-Ming Yang

Department of Gastroenterology, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China.
2014-10-23; doi: 10.1016/j.canlet.2015.01.044
Abstract

In humans, telomerase reverse transcriptase (hTERT) determines the activity of telomerase. hTERT is an ideal anticancer target because it is universally expressed in cancer cells and plays a crucial role in carcinogenesis. In this study, we report the miR-1182-mediated post-transcriptional regulation of hTERT. Over-expression of miR-1182 in different gastric cancer cells decreased hTERT protein levels. Bioinformation and dual-luciferase assays revealed that miR-1182 modulated hTERT by binding to its open reading frame (ORF), and this miRNA recognizes elements in the nucleotide region between 2695 and 2719 of hTERT mRNA. Over-expression of hTERT by transfecting pIRES2-hTERT into U2OS cells was abolished by miR-1182, while pIRES2-hTERT-MT, in which miR-1182 target site was synonymously mutated, failed to respond to miR-1182. Further investigation revealed that miR-1182 inhibited gastric cancer proliferation and migration by targeting the ORF1 of hTERT. We also found that miR-1182 could attenuate the proliferative and metastatic potential of SGC-7901 cell in vivo. Moreover, we found a statistically significant inverse correlation between miR-1182 and hTERT protein levels in tissues from 42 gastric cancer patients. These data indicate that miR-1182 suppresses TERT, and thus it could be an effective target for the treatment of gastric cancer.



Copyright © 2015. Published by Elsevier Ireland Ltd.

PMID:25662441






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