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Effects of MiR-210 on proliferation, apoptosis and invasion abilities of esophageal cancer cells.

PURPOSE
To investigate the effects of microRNA-210 (miRNA- 210) on the biological behaviors (proliferation and invasion) of EC109 cells of highly metastatic human esophageal cancer (EC).


METHODS
The EC109 genomic DNA of human EC was used as a template to amplify the precursor sequence of miRNA-210 by polymerase chain reaction (PCR). The precursor sequence of miRNA-210 was sub-cloned into the eukaryotic expression vector pcDNA3.1(-) via double digestion by BamH I and Hind III restriction enzymes. Then the pcDNA3.1 (-)-pri-miRNA-210 vector (named as p-miRNA-210) that was constructed successfully was transiently transfected into EC109 cells of human EC in vitro. Quantitative real-time PCR (qRT-PCR) was used to detect the expression level of mature miR-210. 3-(4,5-dimethyl-2-thiazolyl)-2,5- diphenyl-2-H-tetrazolium bromide (MTT) assay and scratch method were adopted to detect the proliferation and in vitro migration of EC109 cells, and flow cytometry was performed to detect the degree of cell apoptosis.


RESULTS
The eukaryotic expression vector carrying miRNA- 210 was constructed successfully. Compared with that in the blank group (Mock) and the control group (P-Blank), miRNA-210 was overexpressed in the transfected EC109 cells. The cell apoptosis was significantly increased compared with that in the control group (p<0.05); the inhibition of proliferation of EC109 cells in the p-miRNA-210 vector transfected group was remarkably elevated (p<0.05), and wound healing ability was also significantly increased (p<0.05).


CONCLUSION
The overexpression of miRNA-210 can significantly inhibit the proliferation of EC109 cells of human EC and accelerate the migration ability and the rate of apoptosis, providing a potential strategy for the treatment of EC.