O6-methylguanine-DNA methyltransferase hypermethylation modulated by 17β-estradiol in lung cancer cells

Ji Ching Lai, Jeng Yuan Wu, Ya Wen Cheng, Kun Tu Yeh, Tzu Chin Wu, Chih Yi Chen, Huei Lee

研究成果: 雜誌貢獻文章同行評審

24 引文 斯高帕斯(Scopus)

摘要

Background: Our recent report indicated that MGMT hypermethylation is more common in squamous cell carcinomas (SCC) in males, and smokers than in adenocarcinomas (ADC) infernales, and nonsmokers. More interestingly, MGMT hypermethylation in SCC and ADC was pronouncedly influenced by gender factor, not by smoking status. We questioned whether 17β-estradiol could modulate the machinery of promoter methylation to cause the gender difference of MGMT hypermethylation in lung cancer. Materials and Methods: Two MGMT hypermethylated Ch27 and H1355 lung cancer cell lines were treated with or without 17β-estradiol and the status of hypermethylation was examined by methylated specific methylation (MSP) as compared with both cells treated with demethylating agents, 5-AZA-dC (AZA) or TSA. Results: Our data showed that 17β-estradiol, similar to AZA, diminished the MGMT hypermethylation and restored MGMT mRNA expression, which was not observed in the case of TSA. Western blotting showed that 17β-estradiol markedly reduced DNMT1 expression in Ch27 and H1355 cells, but slightly reduced HDAC1 expression. Consequently, acetylated H3 and H4 histone levels were slightly increased by 17β-estradiol in both cell types. In addition, ChIP analysis revealed that 17β-estradiol simultaneously diminished the binding activity of both proteins on the MGMT promoter of both cell lines. Conclusion: 17β-Estradiol decreased DNMT1 and HDAC1 protein expressions and their binding activity on MGMT promoter, and this may partially contribute to the gender difference of MGMT hypermethylation in lung cancer.
原文英語
頁(從 - 到)2535-2540
頁數6
期刊Anticancer Research
29
發行號7
出版狀態已發佈 - 七月 2009
對外發佈

ASJC Scopus subject areas

  • 癌症研究
  • 腫瘤科

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