p16基因CpG位点甲基化在维吾尔族宫颈鳞癌及HPV16感染中的意义

p16 gene CpG methylation in cervical squamous cell carcinoma and HPV16 infection in Uyghur women

目的:探讨p16基因启动子区CpG位点甲基化及HPV16感染与新疆维吾尔族宫颈鳞癌的关系及其意义。方法:采用基质辅助激光解析电离飞行时间质谱方法(MALDI-TOF MS)对20例维吾尔族宫颈鳞癌及20例对照组维吾尔族宫颈组织中的p16基因启动子CpG位点甲基化进行定量检测;采用聚合酶链反应(PCR)的方法检测两组HPV16的感染状况。结果:宫颈鳞癌及对照组中p16基因启动子区16个CpG位点中CpG1-2,CpG6为甲基化差异位点,宫颈鳞癌组中CpG1-2,CpG6位点甲基化水平明显高于对照组;宫颈鳞癌组的HPV16感染率明显高于对照组,差异有统计学意义(P<0.05);所检测的维吾尔族宫颈鳞癌组织中p16基因启动子区CpG位点甲基化与HPV16感染无明显相关。结论:p16基因启动子区CpG1-2,CpG6位点高甲基化及HPV16感染均与维吾尔族宫颈鳞癌的发生有关系,但为两个独立事件。

Objective： To determine the correlation between p16 gene CpG methylation sites in the promoter region and HPV16 infection in cervical squamous cell carcinoma in Xinjiang Uyghur women. Methods： MALDI-TOF MS was used quantitatively to analyze p16 gene promotor methylation status of CpG islands in 20 cervix squamous cell carcinomas and 20 corresponding non-cancerous tissues in Uyghur women. HPV16 infection was detected by polymerase chain reaction （PCR） in both groups. Results： Among the 16 CpG sites in the p16 gene promoter region, CpG1-2 and CpG 6 sites were different between the 2 groups, and the levels of CpG 1-2 and CpG6 methylation sites in the cervical squamous cell carcinoma were higher than those in the control group. The presence of HPV16 infection was significantly different between the cervix squamous cell carcinoma tissue and non-cancerous tissues （P〈0.05）. There was no significant correlation between p16 gene CpG methylation sites and HPV16 infection of cervical squamous cell carcinoma in Uyghur women. Conclusion： P16 gene CpG 1-2, CpG 6 hypermethylation and HPV16, which are independent of one another, play an important role in cervical squamous cell carcinogenesis in Uyghur women.