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Androgen receptor is targeted to distinct subcellular compartments in response to different therapeutic antiandrogens

Hayley C Whitaker1, Sarah Hanrahan, Nick Totty

  • 1Prostate Cancer Research Group, Department of Cancer Medicine, Faculty of Medicine, Imperial College London, London, United Kingdom.

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
|November 10, 2004
PubMed
Abstract

Insights

Different antiandrogens affect prostate cancer treatment by altering androgen receptor (AR) localization in distinct ways. Understanding these AR mechanisms can inform better treatment strategies for prostate cancer patients.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Antiandrogens are standard prostate cancer treatments that target the androgen receptor (AR).
  • The precise mechanisms by which antiandrogens affect AR localization remain largely unknown.
  • This study investigates AR localization in prostate cells under physiological conditions with androgen and antiandrogen treatment.

Purpose of the Study:

  • To elucidate the subcellular localization mechanisms of the wild-type androgen receptor (AR) in prostate cells.
  • To investigate the differential effects of clinically used antiandrogens on AR localization.
  • To establish a cellular model for studying AR behavior in response to therapeutic agents.

Main Methods:

  • Utilized a cellular model of prostate cancer.
  • Employed in situ cellular fractionation, proteomics, and confocal microscopy.
  • Investigated the effects of various antiandrogens on AR subcellular localization.

Main Results:

  • Androgen treatment causes AR translocation from the cytoplasm to the nucleoplasm.
  • Hydroxyflutamide and bicalutamide induce reversible AR association with the nuclear matrix.
  • Cyproterone acetate leads to AR association with cytoplasmic membranes and irreversible cytoplasmic retention.
  • AR translocation is an ATP- and cytoskeleton-dependent process, irrespective of the ligand.

Conclusions:

  • Antiandrogens exhibit diverse mechanisms of action affecting AR localization.
  • These findings suggest that sequential antiandrogen therapy could be optimized for prostate cancer patients.
  • The study identifies novel subnuclear and subcytoplasmic AR associations, opening new research avenues for understanding antiandrogen therapy response and resistance in prostate cancer.

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