Abstract
miR-34a has been identified as a tumor suppressor in several tumors, but its involvement in gallbladder cancer (GBC) has not been reported. In this study, the miR-34a level and telomere length were measured in 77 gallbladder adenocarcinomas and 36 peritumoral tissues by real-time PCR. Forced miR-34a expression was established by an adenovirus carrying a miR-34a expression cassette. The colony-forming ability of isolated CD44+CD133+ GBC tumor stem-like cells was measured by matrigel colony assay. The xenograft tumor models were established by inoculating nude mice with CD44+CD133+cells. Results showed that significantly lower miR-34a expression and longer telomere length were observed in gallbladder adenocarcinoma tissues, which correlated with poor prognosis of GBC patients. Forced overexpression of miR-34a inhibited the colony-forming ability of CD44+CD133+ GBC tumor stem-like cells in vitro and xenograft tumor growth in vivo. Injection of Ad-miR-34a downregulated PNUTS expression and reduced telomere length in xenograft GBC tumor cells. In conclusion, miR-34a is a tumor suppressor in gallbladder cancer. Both low miR-34a expression and long telomere length are markers for poor prognosis of patients with gallbladder adenocarcinoma. Our study also suggests that the miR-34a gene could be a target for targeting therapy of GBC.
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This study was supported by the National Hi-tech Program (863 Project) of China (No. 2007AA021804, 2007AA021809).
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Jin, K., Xiang, Y., Tang, J. et al. miR-34 is associated with poor prognosis of patients with gallbladder cancer through regulating telomere length in tumor stem cells. Tumor Biol. 35, 1503–1510 (2014). https://doi.org/10.1007/s13277-013-1207-z
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DOI: https://doi.org/10.1007/s13277-013-1207-z