摘要
目的研究5-氮杂-2'-脱氧胞苷(5-aza-CdR)在肝癌细胞株SMMC7721中对程序性细胞死亡因子4(PDCD4)表达的影响及可能机制。方法培养肝癌细胞株SMMC7721,用5-aza-CdR处理肝癌细胞株SMMC7721,Western-blotting检测DNMT3b、PDCD4蛋白在处理前后的变化,甲基化特异性PCR即MSP检测PDCD4基因启动子区域甲基化水平。结果1×10mol/L、5×10^-6 mol/L的5-azaCdR作用于SMMC7721细胞后,DNMT3b表达水平降低,而PDCD4表达水平升高,且浓度之间有差异;MSP示药物处理前PDCD4启动子区域处于高甲基化水平,在用5×10^-6mol/L药物处理后,其启动子发生了去甲基化。结论5-aza-CdR可以抑制DNMT3b在SMMC7721中的表达,且可能通过改变抑癌基因PDCD4启动子甲基化状态影响PDCD4表达。
Objective To investigate the effects of 5-aza CdR on expression of programmed cell death factor 4 (PDCD4) in SMMC7721and explore its possible mechanism. Methods Hepatocellular carcinoma cell line SMMC7721 was cultivated with 5-aza-CdR inhibiting the expression of DNMT3b. Western blotting was used to determine the changes of DNMT3b and PDCD4 proteins and the methyl- ation level of PDCD4's promoter was tested by methylation specific polymerase chain reaction(MSP). Results Using the 5-aza-CdR on concentration of 1×10-6mol/L and 5×10^-6mol/L to cultivate SMMC7721, the expression of DNMT3b protein was decreased while the PDCD4 protein was increased. The methylation level of PDCD4's promoter was high in SMMC7721. However, after the treatment of 5-aza-CdR on concentration of 5×10^-6mol/L, the promoter of PDCD4 had demethylation. Conclusion The expression of DNMT3b can be inhibited by 5-aza-CdR and DNMT3b may control the expression of PDCD4 in SMMC7721 by influencing the methylation status of its promoter.
出处
《中华肝胆外科杂志》
CAS
CSCD
北大核心
2009年第12期931-933,共3页
Chinese Journal of Hepatobiliary Surgery
基金
本课题受国家自然科学基金资助(基金编号30571814)