Nickel-induced epithelial-mesenchymal transition by reactive oxygen species generation and E-cadherin promoter hypermethylation

Chih Hsien Wu, Sheau Chung Tang, Po Hui Wang, Huei Lee, Jiunn Liang Ko

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56 Citations (Scopus)

Abstract

Epithelial-mesenchymal transition (EMT) is considered a critical event in the pathogenesis of lung fibrosis and tumor metastasis. During EMT, the expression of differentiation markers switches from cell-cell junction proteins such as E-cadherin to mesenchymal markers such as fibronectin. Although nickel-containing compounds have been shown to be associated with lung carcinogenesis, the role of nickel in the EMT process in bronchial epithelial cells is not clear. The aim of this study was to examine whether nickel contributes to EMT in human bronchial epithelial cells. We also attempted to clarify the mechanisms involved in NiCl2-induced EMT. Our results showed that NiCl2 induced EMT phenotype marker alterations such as upregulation of fibronectin and down-regulation of E-cadherin. In addition, the potent antioxidant N-acetylcysteine blocked EMT and expression of HIF-1α induced by NiCl2, whereas the DNA methyltransferase inhibitor 5-aza-2′-deoxycytidine restored the down-regulation of E-cadherin induced by NiCl2. Promoter hypermethylation of E-cadherin, determined by quantitative real time methyl-specific PCR and bisulfate sequencing, was also induced by NiCl2. These results shed new light on the contribution of NiCl2 to carcinogenesis. Specifically, NiCl2 induces down-regulation of E-cadherin by reactive oxygen species generation and promoter hypermethylation. This study demonstrates for the first time that nickel induces EMT in bronchial epithelial cells.

Original languageEnglish
Pages (from-to)25292-25302
Number of pages11
JournalJournal of Biological Chemistry
Volume287
Issue number30
DOIs
Publication statusPublished - Jul 20 2012
Externally publishedYes

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ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Molecular Biology

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