RESUMO
Objective To explore the effect of miR-200b on chemosensitivity of cervical cancer HeLa cells to paclitaxel and its mechanism.Methods A recombinant miR-200b mimics was transfected into cultured HeLa cells,which were divided into observation group,negative group,and blank control group.Each group was treated with different concentrations of paclitaxel.Methyl thiazolyl tetrazolium (MTF) assay was performed to evalate the proliferative ability of these treated cells to paclitaxel.AnnexinVFITC/PI method was used to detect the apoptosis rate of Hela cells.The protein level of vascular endothelial growth factor (VEGF) was detected by Western blot.Results MTT assay showed that the OD values of three groups were totally different;and compared to the other two groups,the OD value of the transfected HeLa cells was significantly lower (P ＜ 0.05).Compared to the negative group and the blank control group,there was no statistical difference (P ＞ 0.05).AnnexinV-FITC/PI results demonstrated that the apoptotic index of the transfected HeLa cells was significantly higher than that in the other two groups (P ＜0.05).Western blot assay showed that expression of VEGF protein in three groups of relative quantity was 0.403 ± 0.046,0.882 ± 0.094,and 0.901 0.102,respectively.There was significant difference among there groups (P ＜ 0.05).Conclusions miR-200b mimics can increase the sensitivity of cervical cancer HeLa cells to paclitaxel,and targeted regulation of VEGF may be the cause of increasing in drug sensitivity.