RESUMO
Objective:To investigate the effects of miR-125b on radiosensitivity of cervical cancer cells and its possible downstream mechanism.Methods:The expression of miR-125b and Foxp3 in cervical cancer tissues and cells was detected by RT-qPCR. The HeLa cells were irradiated with 0, 2, 4 and 6 Gy of X-rays. The expression of miR-125b and Foxp3 in each group was detected by RT-qPCR. After downregulation of miR-125b expression and 6 Gy X-ray irradiation, the proliferation ability of HeLa cells was detected by MTT assay, and the expression of Bax and Bcl-2 proteins were detected by Western blot. The relationship between miR-125b and Foxp3 was detected by Targetscan and Dual luciferin reporter assay. After downregulation of Foxp3 expression and 6 Gy X-ray irradiation, the proliferation ability of HeLa cells was detected by MTT assay, and the expression of Bax and Bcl-2 proteins were detected by Western blot. The effects of miR-125b on radiosensitivity of HeLa cells through Foxp3 were detected. After down-regulation of Foxp3, the contents of IL-10 and TGF-β in supernatant were detected by ELISA.Results:The expression of miR-125b in the tissues and cells of cervical cancer was significantly decreased, while the expression of Foxp3 was significantly increased. The expression of miR-125b in HeLa cells was increased after radiation in a dose dependent manner. The expression of Foxp3 in HeLa cells was decreased after radiation in a dose dependent manner. After 6 Gy X-ray irradiation of HeLa cells, down-regulation of miR-125b increased the cell proliferation capacity, significantly reduced the expression of Bax and increased the expression of Bcl-2. miR-125b targets Foxp3 and negatively regulates Foxp3 expression. After 6 Gy X-ray irradiation of HeLa cells, down-regulation of Foxp3 significantly reduced the proliferation capacity of HeLa cells, increased the expression of Bax and decreased the expression of Bcl-2. Overexpression of miR-125b can enhance radiosensitivity of HeLa cells through Foxp3.After 6 Gy X-ray irradiation, down-regulation of Foxp3 reduced the expression of IL-10 and TGF-β in cells.Conclusions:Upregulation of miR-125b enhances the radiosensitivity of cervical cancer cells by targeting and negatively regulating Foxp3, and the mechanism of that may be related to the down-regulation of Foxp3 to reduce the expression of IL-10 and TGF-β in the cells.