目的:研究微小RNA-34a(microRNA-34a,miR-34a)在阿霉素诱导的心肌细胞凋亡中的作用及其作用靶基因。方法:建立阿霉素(doxorubicin,Dox)诱导的大鼠H9c2心肌细胞凋亡模型;TUNEL染色观察H9c2细胞凋亡;双萤光素酶报告实验检测miR-34a与潜在靶基因沉默信息调节因子1(silent information regulator 1,SIRT1)3'端非翻译区(3'-untranslated region,3'UTR)的结合作用;实时荧光定量PCR检测miR-34a和SIRT1 mRNA表达水平,Western blot检测SIRT1和凋亡相关蛋白表达水平。结果:阿霉素处理H9c2细胞之后,细胞发生凋亡,miR-34a的表达显著增强;双萤光素酶报告实验提示miR-34a与SIRT1 3'UTR可相互作用,并证实miR-34a可在转录后水平抑制SIRT1的表达,SIRT1蛋白水平在阿霉素处理的心肌细胞中显著下调;过表达miR-34a及沉默SIRT1均能一致性抑制Bcl-2表达,促进Bax和p66shc的表达,而过表达SIRT1能有效抑制阿霉素诱导的H9c2细胞凋亡。结论:S...
【英文摘要】
AIM:To investigate the role of microRNA-34a(miR-34a) in doxorubicin(Dox)-induced cardiomyocyte apoptosis and the potential target gene.METHODS:The apoptotic model of H9c2 cells was established by Dox induction.The apoptotic H9c2 cells was detected by TUNEL assay.Dual luciferase reporter assay was performed to confirm the interaction between miR-34 a and the 3'UTR of silent information regulator 1(SIRT1).The expression of miR-34 a and SIRT1 mRNA was determined by RT-qPCR,and the protein expression of SIRT1 a...