【摘要】 背景与目的:Notch信号转导途径与细胞增殖与分化的调控密切相关,它的功能失调在肿瘤细胞的增殖分化中发挥着重要的作用。本研究构建了针对Notch1的可调控RNA干扰载体,并从分子水平及细胞水平上研究其对HeLa细胞的影响。方法:利用受CRE重组调控的RNA干扰载体pSico和pSicoR构建针对GAPDH和Notch1的shRNA表达载体,以pBS185-CRE作为CRE蛋白的表达载体,将HeLa细胞分为pSico、pSico/CRE、pSicoR和pSicoR/CRE4组,分别转染相应质粒,RT-PCR和Westernblot法检测干扰效率,CBF-1荧光素酶报告载体检测细胞内活性Notch信号水平,MTS实验检测细胞增殖状态。结果:各组细胞在转染重组质粒pSico(R)-GAPDH和pSico(R)-Notch1后,EGFP的表达均表现出明显的CRE依赖性;RT-PCR和Westernblot实验显示,pSico(R)-Notch1载体能在CRE蛋白的调控下抑制Notch1基因的表达,CBF-1荧光素酶报告载体实验可见,Notch1的干扰作用使细胞内Notch信号水平下降;MTS实验可见Notch1干扰引起的HeLa细胞增殖抑制。结论:由可调控RNA干扰载体介导的CRE依赖性Notch1表达降低能降低细胞内Notch信号水平并抑制HeLa细胞增殖。更多还原

【Abstract】 BACKGROUND & OBJECTIVE: Notch signal transduction pathway mediates cell differentiation and proliferation. Its dysfunction is supposed to be involved in tumorigenesis and development. This study was to construct a course recombination enzyme(CRE)-dependent short hairpin RNA (shRNA) expression plasmid targeting Notch1, and investigate its effect on proliferation of cervical cancer cell line HeLa. METHODS: RNA interfering vectors pSico and pSicoR were used to construct CRE-dependent shRNA expression plasmids targeting GAPDH and Notch1; pBS185-CRE was used as an expression vector of CRE. HeLa cells were divided into 4 groups and transfected with pSico, pSico/CRE, pSicoR, and pSicoR/CRE, respectively. Reverse transcription-polymerase chain reaction (RT-PCR) and Western blot were carried out to assess the efficiency of RNA interference (RNAi), and intracellular Notch signal level was tested by CBF-1 reporter plasmid. The proliferation of HeLa cells after CRE-dependent Notch1 RNAi was detected by MTS assay. RESULTS: After transfection of pSico (R)-GAPDH and pSico (R)-Notch1, CRE-dependent green fluorescent cells were detected; Notch1 expression was inhibited; intracellular Notch1 signal level was decreased; the proliferation of HeLa cells was suppressed. CONCLUSION: RNAi of Notch1 mediated by CRE-dependent shRNA expression plasmid can down-regulate intracellular Notch1 signal level and suppress the proliferation of HeLa cells.更多还原