反义miR-30a-5p对人脑胶质瘤细胞U251生长的抑制作用

目的 观察敲低microRNA(miR)-30a-5p表达对人脑胶质瘤U251细胞生物学特征的影响.方法 用脂质体介导转染寡聚核苷酸抑制物(miR-30a-5p inhibitor)于人脑胶质瘤U251细胞.采用实时聚合酶链反应(real-time PCR)检测转染后U251细胞的miR-30a-5p表达水平以鉴定抑制效果;噻唑蓝(MTT)比色法评价miR-30a-5p inhibitor抑制U251细胞生长的作用;Transwell实验检测细胞侵袭能力变化;流式细胞术检测细胞周期变化;Annexin V法检测细胞早期凋亡.结果 real-time PCR检测结果 显示转染miR-30a-5p inhibitor后,肿瘤细胞miR-30a-5p表达下降,细胞增殖活性降低,细胞侵袭能力明显受到抑制,细胞周期阻滞在G0/G1期及早期凋亡增加.结论 miR-30a-5p可能是癌微RNA(oncomiR)之一,有望成为人脑胶质瘤基因治疗的候选靶点.

Abstract：

Objective To investigate the effect of knock-down of miR-30a-5p on the biological characteristics of U251 glioblastoma cells. Methods miR-30a-5p inhibitor, mediated by Lipofectamine 2000, was transfected to U251 cells for knocking down miR-30a-5p. Real-time polymerase chain reaction (PCR) was conducted to detect the expression of miR-30a-5p in transfected cells. The cell proliferation rate was detected by methyl thiazol tetrazolium (MTT) assay, and cell cycle kinetics was examined by flow cytometry. The cell invasive ability was evaluated by Transwell assay and apoptosis detected by Annexin V assay. Results The expression of miR-30a-5p in the miR-30a-5p inhibitor group was significantly down-regulated. The cell proliferation activity and invasive ability were reduced. Cells were arrested in G0/G1 phase, and apoptosis was induced in cells transfected with miR-30a-5p inhibitor as compared to those of the cells transfected with scramble siRNA and control cells, so suppression of miR-30a-5p expression rendered the glioma cells harboring less aggressive phenotype. Conclusion miR-30a-5p is one of oncomiRs. It may be a candidate target miRNA for gene therapy of gliomas.

Inhibitory effect of knocking down miR-30a-5p on the growth of U251 glioma cells

Objective To investigate the effect of knock-down of miR-30a-5p on the biological characteristics of U251 glioblastoma cells. Methods miR-30a-5p inhibitor, mediated by Lipofectamine 2000, was transfected to U251 cells for knocking down miR-30a-5p. Real-time polymerase chain reaction (PCR) was conducted to detect the expression of miR-30a-5p in transfected cells. The cell proliferation rate was detected by methyl thiazol tetrazolium (MTT) assay, and cell cycle kinetics was examined by flow cytometry. The cell invasive ability was evaluated by Transwell assay and apoptosis detected by Annexin V assay. Results The expression of miR-30a-5p in the miR-30a-5p inhibitor group was significantly down-regulated. The cell proliferation activity and invasive ability were reduced. Cells were arrested in G0/G1 phase, and apoptosis was induced in cells transfected with miR-30a-5p inhibitor as compared to those of the cells transfected with scramble siRNA and control cells, so suppression of miR-30a-5p expression rendered the glioma cells harboring less aggressive phenotype. Conclusion miR-30a-5p is one of oncomiRs. It may be a candidate target miRNA for gene therapy of gliomas.