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Chromatin Immunoprecipitation Assay Using Micrococcal Nucleases in Mammalian Cells
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Interleukin-4 activates androgen receptor through CBP/p300.

Soo Ok Lee1, Jae Yeon Chun, Nagalakshmi Nadiminty

  • 1Department of Urology and Cancer Center, University of California Davis Medical Center, Sacramento, California 95817, USA.

The Prostate
|September 27, 2008
PubMed
Summary

Interleukin-4 (IL-4) activates androgen receptor (AR) in prostate cancer by increasing CBP/p300 expression and activity. This mechanism drives castration-resistant prostate cancer growth, offering potential therapeutic targets.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Aberrant androgen receptor (AR) activation drives castration-resistant prostate cancer (CRPC) progression.
  • Interleukin-4 (IL-4) promotes CRPC growth by enhancing AR activation without androgens.

Purpose of the Study:

  • To elucidate the mechanism by which IL-4 mediates androgen receptor activation.
  • To investigate the role of CBP/p300 in IL-4-induced AR activation in prostate cancer.

Main Methods:

  • Western blot analysis to assess CBP/p300 expression.
  • Co-immunoprecipitation and ChIP assays to evaluate AR and CBP/p300 interactions.
  • siRNA-mediated knockdown of CBP/p300 to determine its role in IL-4 signaling.

Main Results:

  • IL-4 significantly increases CBP/p300 protein levels and enhances its interaction with AR.
  • IL-4 promotes CBP/p300 recruitment to androgen-responsive elements, increasing AR acetylation.
  • Knockdown of CBP/p300 abrogates IL-4-mediated AR activation and acetylation.

Conclusions:

  • IL-4 activates the androgen receptor (AR) in prostate cancer cells.
  • This activation is mediated by increased expression and histone acetyltransferase activity of CBP/p300.
  • CBP/p300 is a key mediator of IL-4's pro-proliferative effects in CRPC.