Methylation of TFPI-2 is an early event of esophageal carcinogenesis

Yan Jia, Yunsheng Yang, Malcolm V. Brock, Baoping Cao, Qimin Zhan, Yazhuo Li, Yuanzi Yu, James G. Herman, Mingzhou Guo

Research output: Contribution to journalArticlepeer-review


Aims: To explore the epigenetic changes and the function of TFPI-2 in esophageal cancer. Materials & methods: Nine esophageal cancer cell lines, nine normal esophageal mucosa, 60 esophageal dysplasia and 106 advanced esophageal cancer samples were included in this study. TFPI-2 methylation was examined by methylation-specific PCR. TFPI-2 expression was evaluated by immunohistochemistry in tissue samples. The effect of TFPI-2 on proliferation, apoptosis, invasion and migration was analyzed by colony formation assay, western blot assay, transwell assay and flow cytometric analysis. Results: TFPI-2 expression was regulated by promoter region hypermethylation in human esophageal cancer cell lines, and TFPI-2 expression is inversely correlated with methylation in primary cancer. Methylation was found in 28.2, 33.3 and 33.3% of grade 1, 2 and 3 esophageal dysplasia, and 67% of primary esophageal cancer, but no methylation was found in normal mucosa. Methylation is significantly related to tumor differentiation. Inhibition of invasion, migration, colony formation and proliferation, and induction of apoptosis occurred with the restoration of TFPI-2 expression in the KYSE70 cell line. Conclusion: TFPI-2 is frequently methylated in esophageal cancer with a progression tendency. TFPI-2 is a potential tumor suppressor in esophageal cancer.

Original languageEnglish (US)
Pages (from-to)135-146
Number of pages12
Issue number2
StatePublished - Apr 2012


  • DNA methylation
  • TFPI-2
  • carcinogenesis
  • dysplasia
  • esophageal cancer

ASJC Scopus subject areas

  • Genetics
  • Cancer Research


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