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

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Author(s)

  • 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

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Publication details

JournalCancer research
DateAccepted/In press - 22 Feb 2016
DatePublished (current) - 16 Mar 2016
Issue number9
Volume76
Number of pages15
Pages (from-to)2637-2651
Original languageEnglish

Abstract

Radiation therapy 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 survive radiation therapy, 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.

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