摘要
目的:研究过表达微小RNA-7(microRNA-7,miRNA-7)诱导人鼻咽癌(nasopharyngeal carcinoma,NPC)CNE-1细胞凋亡及其与Bax和Bcl-2表达之间的关联情况。方法:体外利用脂质体Lipofectamine 2000将miRNA-7模拟物转染到人鼻咽癌CNE-1细胞中;采用real-time PCR法检测转染后各实验组细胞中miRNA-7的相对表达情况;CCK-8法检测各组细胞活力的改变;在荧光显微镜下利用Hoechst 33258荧光染色法观察转染后细胞的凋亡;real-time PCR法检测Bax和Bcl-2的mRNA表达水平;Western blot法检测Bax和Bcl-2蛋白表达水平。结果:Real-time PCR结果表明,转染miRNA-7模拟物的CNE-1细胞中其miRNA-7的相对表达水平明显高于无关序列组和空白对照组(P<0.01);转染miRNA-7模拟物后,CNE-1细胞的活力明显下降(P<0.01);Hoechst 33258染色检测可发现典型的凋亡细胞核形态学变化;real-time PCR及Western blot结果显示,转染miRNA-7模拟物的CNE-1细胞中Bax的mRNA及蛋白显著上调(P<0.01),而Bcl-2的mRNA及蛋白则显著下调(P<0.01)。结论:过表达miRNA-7可以通过调节Bax/Bcl-2之间的比例关系来抑制鼻咽癌CNE-1细胞的恶性生长,并促进细胞凋亡。
AIM： To investigate the relationship of microRNA-7（ miRNA-7） over-expression and Bax/Bcl-2expression in human nasopharyngeal carcinoma CNE-1 cells. METHODS： The CNE-1 cells were transfected with miRNA-7 mimics using Lipofectamine 2000. The expression of miRNA-7 was detected by real-time PCR. CCK-8 assay and Hoechst33258 staining were used to detect the cell activity and apoptosis. The expression of Bax / Bcl-2 at mRNA and protein levels was determined by real-time PCR and Western blot. RESULTS： The expression of miRNA-7 was increased significantly in the CNE-1 cells compared with negative control group and mock group（ P〈0. 01）. The activity of CNE-1 cells were extremely decreased after tansfected with miRNA-7 mimics（ P〈0. 01）. The typical apoptotic nuclear morphological changes were observed in the CNE-1 cells under the fluorescence microscope with Hoechst 33258 staining. The expression of Bax at mRNA and protein levels was significantly increased compared with the other 2 groups（ P〈0. 01）,while the Bcl-2 expression at mRNA and protein levels was significantly down-regulated（ P〈0. 01）. CONCLUSION： Over-expression of miRNA-7 significantly inhibits the growth and promotes the apoptosis of nasopharyngeal carcinoma CNE-1 cells by increasing the expression of Bax and down-regulating Bcl-2.
出处
《中国病理生理杂志》
CAS
CSCD
北大核心
2016年第5期933-937,共5页
Chinese Journal of Pathophysiology
基金
浙江省医药卫生科技项目(No.2013KYB293)
