Objective To investigate the effect of miR-107 on the proliferation of colorectal cancer cells. Methods The expression of miR-107 was detected in colorectal cancer tissues and colorectal cancer cell lines by real-time quantitative PCR (qRT-PCR). miR-107 expression was up-regulated and down-regulated by the transfection of miR-107 mimic and miR-107 inhibitor in HT29 cells, respectively. The effect of miR-107 on the proliferation of HT29 cells was evaluated by MTT assay. The tumorigenic ability of HT29 cells was detected by soft-agar colony formation assay and nude mouse tumorigenic assay. The expression of cyclin D1 in HT29 cells was tested by Western blot analysis. Results The expression of miR-107 was significantly up-regulated in both colorectal cancer tissues and cells. Overexpression of miR-107 promoted the proliferation and tumorigenicity of HT29 cells, while the decrease of miR-107 expression inhibited the proliferation and tumorigenicity of HT29 cells. Overexpression of miR-107 up-regulated the expression of cyclin D1 in HT29 cells. Conclusion Overexpression of miR-107 in both colon cancer tissues and cells promotes the proliferation and tumor formation potential of HT29 cells via up-regulating cyclin D1 expression.
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