An epigenetic reprogramming strategy to re-sensitize radioresistant prostate cancer cells

Claudia Peitzsch, Monica Cojoc, Linda Hein, Ina Kurth, Katrin Mӓbert, Franziska Trautmann, Barbara Klink, Evelin Schrock, Manfred P Wirth, Mechthild Krause, Eduard A Stakhovsky, Gennady D Telegeev, Vladimir Novotny, Marieta Ioana Toma, Michael Muders, Gustavo B Baretton, Fiona M Frame, Norman J Maitland, Michael Baumann, Anna Dubrovska

Research output: Contribution to journalArticlepeer-review


Radiotherapy is a mainstay of curative prostate cancer treatment, but risks of recurrence after treatment remain significant in locally advanced disease. Given that tumor relapse can be attributed to a population of cancer stem cells (CSC) that survives radiotherapy, analysis of this cell population might illuminate tactics to personalize treatment. However, this direction remains challenging given the plastic nature of prostate cancers following treatment. We show here that irradiating prostate cancer cells stimulates a durable upregulation of stem cell markers that epigenetically reprogram these cells. In both tumorigenic and radioresistant cell populations, a phenotypic switch occurred during a course of radiotherapy that was associated with stable genetic and epigenetic changes. Specifically, we found that irradiation triggered histone H3 methylation at the promoter of the CSC marker aldehyde dehydrogenase 1A1 (ALDH1A1), stimulating its gene transcription. Inhibiting this methylation event triggered apoptosis, promoted radiosensitization, and hindered tumorigenicity of radioresistant prostate cancer cells. Overall, our results suggest that epigenetic therapies may restore the cytotoxic effects of irradiation in radioresistant CSC populations.

Original languageEnglish
Pages (from-to)2637-2651
Number of pages15
JournalCancer research
Issue number9
Early online date16 Mar 2016
Publication statusPublished - 1 May 2016

Bibliographical note

©2016 American Association for Cancer Research.


  • Animals
  • Blotting, Western
  • Cell Line, Tumor
  • Chromatin Immunoprecipitation
  • Comparative Genomic Hybridization
  • DNA Methylation/radiation effects
  • Epigenesis, Genetic/radiation effects
  • Flow Cytometry
  • Gene Expression Regulation, Neoplastic/radiation effects
  • Heterografts
  • Histones/genetics
  • Humans
  • Male
  • Mice
  • Mice, Nude
  • Microscopy, Fluorescence
  • Oligonucleotide Array Sequence Analysis
  • Promoter Regions, Genetic/genetics
  • Prostatic Neoplasms/genetics
  • Radiation Tolerance/genetics
  • Radiotherapy
  • Retinal Dehydrogenase/genetics

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