The histone deacetylase inhibitor trichostatin A alters microRNA expression profiles in apoptosis-resistant breast cancer cells

Lyndsay V. Rhodes, Ashley M. Nitschke, H. Chris Segar, Elizabeth C. Martin, Jennifer L. Driver, Steven Elliott, Seung Yoon Nam, Meng Li, Kenneth P. Nephew, Matthew E. Burow, Bridgette M. Collins-Burow

Research output: Contribution to journalArticle

52 Scopus citations

Abstract

The development of drug resistance represents a major complication in the effective treatment of breast cancer. Epigenetic therapy, through the use of histone deacetylase inhibitors (HDACi) or demethylation agents, is an emerging area of therapeutic targeting in a number of ontological entities, particularly in the setting of aggressive therapy-resistant disease. Using the well-described HDAC inhibitor trichostatin A (TSA) we demonstrate the suppression of in vitro clonogenicity in the previously described apoptosis-resistant MCF-7TN-R breast carcinoma cell line. Additionally, recent work has demonstrated that these agents can alter the expression profile of microRNA signatures in malignant cells. Using an unbiased microRNA microarray analysis, changes in miRNA expression of MCF-7TN-R cells treated with TSA for 24 h were analyzed. We observed significant up-regulation of 22 miRNAs and down-regulation of 10 miRNAs in response to TSA treatment. Our results demonstrate that the HDACi, TSA, exerts anticancer activity in the apoptosis-resistant MCF-7TN-R breast carcinoma cell line. This activity is correlated with TSA alteration of microRNA expression profiles indicative of a less aggressive phenotype.

Original languageEnglish (US)
Pages (from-to)10-16
Number of pages7
JournalOncology reports
Volume27
Issue number1
DOIs
StatePublished - Jan 2012

Keywords

  • Breast cancer
  • Drug resistance
  • Histone deacetylase
  • MCF-7
  • microRNA
  • Trichostatin A

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

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