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中国癌症防治杂志 ›› 2014, Vol. 6 ›› Issue (3): 261-264.doi: 10.3969/j.issn.1674-5671.2014.03.09

• 临床研究 • 上一篇    下一篇

胃癌组织中PCDH8基因甲基化及Dnmt1表达的关系

  

  1. 青岛市市立医院东院急诊科
  • 出版日期:2014-09-25 发布日期:2014-10-17
  • 通讯作者: 姜相君 E-mail:drjxj@163.com
  • 基金资助:

    青岛市科技局科研基金资助项目(2012-1-3-1-(10)-nsh)

Methylation of the PCDH8 promoter and Dnmt1 expression in gastric cancer

  • Online:2014-09-25 Published:2014-10-17

摘要: 目的 探讨PCDH8(protocadherin 8)基因在人胃癌组织中的甲基化状态及其与甲基转移酶1(Dnmt1)表达之间的关系,分析其与胃癌发生、发展的关系。方法 取60例手术切除的胃癌组织及其相应癌旁正常胃黏膜组织(距癌组织5 cm以上),以甲基化特异性聚合酶链式反应(methylationspecific PCR,MSP)检测60例胃癌组织及其癌旁正常胃黏膜组织中PCDH8基因启动子区甲基化的状态;以免疫组化SP法分别检测PCDH8基因蛋白及Dnmt1蛋白的表达水平。 结果 胃癌组织中PCDH8甲基化率为55.0%(33/60), 癌旁正常胃黏膜组织中PCDH8的甲基化率为3.3%(2/60),两者比较差异有统计学意义(χ=38.76,P<0.001),PCDH8甲基化的发生率与患者年龄、性别及TNM分期等差异均无统计学意义(P均>0.05),而与有无淋巴结转移的差异有统计学意义(χ2=17.47,P<0.001)。PCDH8蛋白在癌旁正常胃黏膜组织中的表达(90.0%)明显高于胃癌组织(11.7%)(χ=73.65,P<0.001),Dnmt1蛋白在胃癌组织中的阳性表达率(73.3%)明显高于癌旁正常胃黏膜组织的表达率(5.0%)(χ=58.79,P<0.001)。胃癌组织中PCDH8蛋白与Dnmt1蛋白的表达呈负相关(r=-0.544,P<0.001)。结论 PCDH8基因甲基化及Dnmt1的高表达可能参与了胃癌的发生和发展。

关键词: 胃肿瘤, PCDH8基因, Dnmt1, 基因甲基化

Abstract: Objective To investigate the relationship of gastric carcinogenesis to promoter methylation and expression of the Proto-cadherin-8(PCDH8) gene,as well as to expression of Dnmt1 protein. Method Samples of cancerous and normal gastric mucosa were obtained surgically from 60 patients with primary gastric cancer. Methylation-specific PCR was used to determine the methylation status of the PCDH8 promoter,while immunohistochemistry was used to measure levels of PCDH8 and Dnmt1 proteins. Results Among the 60 patients,33(55.0%) showed a methylated PCDH8 promoter in samples of cancerous tissue,compared to only 2(3.3%) who showed a methylated promoter in normal samples(χ=38.76,P<0.001).Methylation status of the PCDH8 promoter showed no significant association with patient age,sex,or TNM stage;methylation was, however, associated with lymph node metastasis(χ=17.47,P<0.001). Gastric cancer tissue showed significantly lower levels of PCDH8 protein than normal tissue(11.7% vs 90.0%,χ=73.65,P<0.001) and significantly higher levels of Dnmt1 protein(73.3% vs 5.0%,χ2=58.79,P<0.001).In gastric cancer samples, the level of PCDH8 protein correlated negatively with that of Dnmt1 protein(r=-0.544,P<0.001). Conclusion Methylation of the PCDH8 promoter and elevated expression of Dnmt1 may be associated with the occurrence of gastric cancer.

Key words: Gastric neoplasm, Protocadherin 8, Dnmt1, Gene methylation