巢式MSP法检测恶性血液病细胞株p16基因启动子甲基化状态的研究

Detection of Promoter Methylation of p16 Gene in Hematological Malignant Cell Lines by Nested Methylation Specific Polymerase Chain Reaction

本研究应用改进的甲基化特异性PCR(MSP)法,即巢式甲基化特异性PCR法检测6种肿瘤细胞株p16基因启动子的甲基化状态效率,探讨其在筛选p16基因启动子高甲基化的肿瘤细胞株,及将其作为研究基因甲基化与表达关系的理想细胞模型中的应用。6种肿瘤细胞株基因组DNA经碱变性后以亚硫酸盐修饰,再用巢式甲基化特异性聚合酶链反应扩增,分析检测其p16启动子区CpG岛的甲基化状态。结果表明:CA46、U266都有不同程度的p16基因启动子区甲基化,而Molt4、K562、HL-60、Jurkat的p16基因启动子区均未甲基化。结论:用巢式甲基化特异性PCR可以准确的检测出恶性血液病细胞株p16基因的甲基化状态,方法简单,灵敏且重复性强,可以广泛用于筛选各种p16基因启动子区甲基化的恶性血液病细胞株以及恶性血液病诊断。

This study was aimed to investigate the effeciency of modified methylation-specific polymerase chain reaction i.e. nested methylation-specific polymrase chain reaction, used to detect the promoter methylation of p16 gene in six hematological malignant cell lines, and to explore the application in selection of hematological malignant cell lines with promoter hypermethylation, and make them to be an idel cell models for studying the relationship between gene methylation and expression. DNAs were denatured by NaOH and then were subjected to bisulfite modification and a nested-MSP was used to amplify the promoter region, nested MSP product of p16 gene promoter was analyzed and sequenced. The results showed that the hypermethylation of p16 gene was detected in CA46 and U266, however, Molt4, K562, HL-60 and Jurkat cell lines were unmethylated. In conclusion, p16 gene methylation in hematological malignant cell lines can be perfectly detected by nested-MSP method, which is simple, sensitive and specific for screening all kinds of hematological malignant cell lines with p16 gene methylated.