Chromatin remodeling at Alu repeats by epigenetic treatment activates silenced microRNA-512-5p with downregulation of Mcl-1 in human gastric cancer cells

Y. Saito, H. Suzuki, H. Tsugawa, I. Nakagawa, J. Matsuzaki, Y. Kanai, T. Hibi

Research output: Contribution to journalArticlepeer-review

145 Citations (Scopus)

Abstract

Epigenetic therapy using DNA methylation inhibitors and histone deacetylase (HDAC) inhibitors has clinical promise for the treatment of human malignancies. To investigate roles of microRNAs (miRNAs) on epigenetic therapy of gastric cancer, the miRNA expression profile was analysed in human gastric cancer cells treated with 5-aza-2′-deoxycytidine (5-Aza-CdR) and 4-phenylbutyric acid (PBA). miRNA microarray analysis shows that most of miRNAs activated by 5-Aza-CdR and PBA in gastric cancer cells are located at Alu repeats on chromosome 19. Analyses of chromatin modification show that DNA demethylation and HDAC inhibition at Alu repeats activates silenced miR-512-5p by RNA polymerase II. In addition, activation of miR-512-5p by epigenetic treatment induces suppression of Mcl-1, resulting in apoptosis of gastric cancer cells. These results suggest that chromatin remodeling at Alu repeats plays critical roles in the regulation of miRNA expression and that epigenetic activation of silenced Alu-associated miRNAs could be a novel therapeutic approach for gastric cancer.

Original languageEnglish
Pages (from-to)2738-2744
Number of pages7
JournalOncogene
Volume28
Issue number30
DOIs
Publication statusPublished - 2009 Jul 30

Keywords

  • Alu repeats
  • DNA methylation
  • Epigenetic treatment
  • Gastric cancer
  • Histone modification
  • MiRNA

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Cancer Research

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