miR-204对乳腺癌MDA-MB-231细胞生物学特性的影响

目的 研究microRNA-204(miR-204)对乳腺癌细胞生物学特性的影响.方法 在人乳腺癌细胞MDA-MB-231中转染miR-204模拟物和抑制剂后48 h,实时荧光PCR(Real-time PCR)检测细胞中miR-204表达变化.流式细胞仪分析miR-204对MDA-MB-231细胞增殖、凋亡的影响.采用Transwell迁移小室分析法检测miR-204对MDA-MB-231细胞迁移的影响.结果 实时荧光PCR分析:miR-204模拟物和抑制剂效果显著,与正常对照比较差异有统计学意义(P<0.01);流式细胞仪分析:与正常对照相比,miR-204 模拟物组G1期细胞数目明显减少(P<0.01),G2/M期细胞数目明显增多(P<0.01),而miR-204 抑制剂的作用则相反,G1期细胞数目明显增多(P<0.01),G2/M期细胞数目明显减少(P<0.01);miR-204模拟物组明显促进细胞凋亡(P<0.01),而抑制剂组明显抑制细胞凋亡(P<0.01).Transwell迁移小室分析:miR-204 模拟物组穿过Transwell迁移小室的细胞明显减少(P<0.01),而抑制剂组则相反,细胞数目明显增多(P<0.01).结论 miR-204对乳腺癌MDA-MB-231细胞具有负调控作用,能够抑制乳腺癌细胞增殖和迁移,促进癌细胞凋亡.

Effect of miR-204 in cell biological characteristics of breast cancer MDA-MB-231 cell

Objective To study the effect of microRNA-204 (miR-204) on the biological characteristics of breast cancer cells.Methods Real-time PCR was used to detect the expression of miR-204 in human breast cancer cell MDA-MB-231 after transfection of miR-204 mimics and inhibitor for 48 h.Flow cytometry was used to analyse the effect of miR-204 on the proliferation and apoptosis of MDA-MB-231 cells.The effect of miR-204 on the migration of MDA-MB-231 cells was detected by Transwell migration assay.Results Real-time PCR analysis showed that miR-204 mimics and inhibitors had significant effect compared with normal control group(P<0.01).Flow cytometry analysis showed that compared with normal control group,the number of G1 phase cells of miR-204 mimics group was significantly decreased(P<0.01),while the number of G2/M cells of miR-204 mimics group was significantly increased(P<0.01).In contrast,the number of G1 phase cells of miR-204 inhibitor group was significantly increased(P<0.01),while the number of G2/M cells of miR-204 inhibitor group was significantly decreased(P<0.01).miR-204 mimics group significantly promoted apoptosis,while the inhibitor group significantly inhibited apoptosis(P<0.01).Transwell migration analysis showed that the number of cells of miR-204 mimics group were significantly reduced,while the number of cells was significantly increased in the inhibitor group(P<0.01).Conclusion We find miR-204,which can promote cell apoptosis and inhibit cell proliferation and migration,is a negative factor in the breast cancer cell line MDA-MB-231.