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Updated: Jun 30, 2026

Analysis of Cell Cycle Position in Mammalian Cells
12:19

Analysis of Cell Cycle Position in Mammalian Cells

Published on: January 21, 2012

[Critical role for cell cycle regulators in androgen receptor function]

H Akita1, Y Hashimoto, M Hibino

  • 1Department of Urology, Nagoya City University Medical School.

Hinyokika Kiyo. Acta Urologica Japonica
|January 5, 2002
PubMed

Insights

Cyclin E enhances prostate cancer growth by increasing androgen receptor (AR) activity, even during antiandrogen therapy. This suggests cyclin E acts as a coactivator, contributing to treatment resistance.

Area of Science:

  • Molecular biology
  • Cancer research
  • Endocrinology

Context:

  • Prostate cancer growth is androgen-dependent.
  • Resistance to antiandrogen therapy is a significant clinical challenge.
  • The molecular mechanisms driving this resistance are not fully understood.

Purpose:

  • To investigate the role of cyclin E in regulating androgen receptor (AR) activity.
  • To determine if cyclin E influences AR activity in the context of antiandrogen therapy.

Summary:

  • Cyclin E was found to increase the transactivation activity of the human androgen receptor (AR) when bound to its ligand, dihydrotestosterone.
  • This enhancement of AR activity by cyclin E was resistant to the antiandrogen 5-hydroxyflutamide.
  • Cyclin E directly binds to the AB domain of the AR, enhancing its AF-1 transactivation function.

Impact:

  • These findings identify cyclin E as a coactivator of the AR.
  • Aberrant cyclin E expression in tumors may lead to persistent AR activation, even under androgen ablation therapy.
  • This provides a potential therapeutic target for overcoming resistance to antiandrogen treatments in prostate cancer.

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