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Testosterone in Androgen Receptor Signaling and DNA Repair: Enemy or Frenemy?

Melvin Lee Kiang Chua1, Robert G Bristow2

  • 1Department of Radiation Oncology, Princess Margaret Cancer Centre, Toronto, Ontario, Canada.

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
|May 12, 2016
PubMed

Insights

Androgen suppression lowers DNA repair in prostate cancer cells. Dihydrotestosterone stimulation causes DNA breaks, a new strategy to enhance cancer therapy effectiveness.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Androgen suppression is a standard prostate cancer treatment.
  • DNA repair mechanisms are crucial for cancer cell survival.
  • Understanding DNA damage pathways can reveal new therapeutic targets.

Purpose of the Study:

  • To investigate the effect of androgen suppression on DNA repair genes.
  • To explore the role of dihydrotestosterone in inducing DNA damage.
  • To evaluate a novel strategy combining androgen manipulation and DNA damage induction for prostate cancer treatment.

Main Methods:

  • Analyzing transcriptional changes in DNA repair genes under androgen suppression.
  • Stimulating prostate cancer cells with supraphysiologic dihydrotestosterone levels.
  • Assessing DNA damage and topoisomerase II recruitment.
  • Evaluating the sensitization of prostate cancer cells to cytotoxic therapies.

Main Results:

  • Androgen suppression leads to transcriptional downregulation of DNA repair genes.
  • Dihydrotestosterone stimulation induces lethal DNA breaks.
  • Topoisomerase II enzymes are recruited to fragile DNA sites upon stimulation.
  • Combined approach shows potential for sensitizing prostate cancer to radiotherapy.

Conclusions:

  • Androgen suppression impairs DNA repair capacity in prostate cancer.
  • Dihydrotestosterone-induced DNA breaks offer a novel therapeutic vulnerability.
  • Bipolar castration and stimulation represent a promising strategy to enhance prostate cancer treatment efficacy.

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