摘要目的 前期发现miR-30a-5p在胶质瘤中表达明显上调,本实验探究敲低miR-30a-5p对人脑胶质瘤细胞U87细胞生物学特征的影响.方法 real-time PCR检测转染miR-30a-5p I(miR-30a-5p抑制物)后U87细胞的miR-30a-5p表达水平,流式细胞术、MTT、Transwell、Annexin V法检测细胞周期、生长、侵袭及凋亡的改变;Western blot检测相关蛋白.结果 real-time PCR结果显示miR-30a-5p I可有效降低U87细胞中miR-30a-5p表达,抑制细胞增殖活性,使细胞周期阻滞在G0/G1期,侵袭能力明显受抑,凋亡增加,促增殖蛋白PCNA、促细胞周期进展蛋白Cyclin D1及促侵袭蛋白MMP-9的表达明显下调,而抑制侵袭蛋白TIMP-1及凋亡相关蛋白p53表达明显上调.结论 敲低U87细胞的miR-30a-5p表达可抑制胶质瘤的增殖及侵袭,诱导凋亡;miR-30a-5p可成为人脑胶质瘤基因治疗的潜在候选靶点.

abstractsObjective Our previous study had shown that there was overexpression of miR- 30a- 5p in malignant glioma cell lines.In the present study, we aim to investigate the effect of knocking -down miR -30a -5p on the biological characteristics of U87 glioblastoma cells.Method The U87 cells were divided into three groups:control cells,cells transfected with scramble oligonucleotides and cells transfected with miR -30a -5p inhibitors(miR-30a-5p I).Oligonucleotides mediated by lipofectamine were transfected to U87 cells.Real -time PCR was conducted to detect the expression of miR- 30a -5p in transfected cells.The cell proliferation was determined by 3- (4,5- Dimethylthiazol-2-yl) -2,5- diphenyltetrazolium bromide(MTT) assay and flow cytometry.The cell invasion was evaluated by Transwell assay and cell apoptosis was detected with Annexin V staining Moreover, the relevant molecules regulating proliferation, invasion, cell cycle progression and apoptosis were examined by Western blot analysis.Results The expression of miR - 30a - 5p in the cells transfected with miR - 30a - 5p I was significantly reduced.The cell proliferation activity of U87 cell was inhibited.The cell cycle was arrested in G0/G1 phase, cell invasive ability was attenuated and apoptotic cells were increased in cells transfected with miR -30a -5pI as compared to those of the cells transfected with scrambled siRNA and control cells.The expression of proliferating cell nuclear antigen (PCNA), matrix metallopeptidase 9 ( MMP - 9) and Cyclin D1 were downregulated while the tissue inhibitor of metalloproteinase1 (TIMP - 1 ) and p53 were upregulated.Conclusions Transfection of miR - 30a-5p I into glioma cells could inhibit the proliferation activity and invasive ability of U87 cell and induce cell apoptosis, miR -30a -5p is a potential target of gene therapy for glioma.