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BTG2 is an LXXLL-dependent co-repressor for androgen receptor transcriptional activity

Xu-Dong Hu1, Qing-Hui Meng, Jia-Ying Xu

  • 1School of Radiation Medicine and Public Health, Medical College of Soochow University, Suzhou 215123, China.

Biochemical and Biophysical Research Communications
|December 22, 2010
PubMed

Insights

The tumor suppressor BTG2 interacts with the androgen receptor (AR) in prostate cancer cells. This interaction, mediated by a specific motif in BTG2, inhibits cancer cell growth and AR signaling.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Signaling

Background:

  • BTG2 is a tumor suppressor gene frequently downregulated in prostate cancer.
  • BTG2 protein possesses leucine-rich motifs characteristic of nuclear receptor co-factors.
  • Androgen receptor (AR) signaling is a key driver of prostate cancer progression.

Purpose of the Study:

  • To investigate the potential interaction between BTG2 and the androgen receptor (AR).
  • To elucidate the mechanism by which BTG2 affects AR signaling and prostate cancer cell growth.

Main Methods:

  • Sequence analysis to identify functional motifs in BTG2.
  • Co-immunoprecipitation assays to assess BTG2-AR binding.
  • Reporter gene assays to measure AR-mediated transcriptional activity.
  • Cell proliferation assays to evaluate the effect of BTG2 on prostate cancer cell growth.

Main Results:

  • BTG2 directly binds to the androgen receptor (AR), with binding enhanced by androgens.
  • A specific LxxLL motif (92LxxLL96) in BTG2 is crucial for AR interaction and inhibitory activity.
  • Ectopic expression of BTG2 significantly inhibits AR transcriptional activity and prostate cancer cell proliferation.
  • BTG2 attenuates androgen-induced PSA expression, dependent on the intact 92LxxLL96 motif.

Conclusions:

  • BTG2 interacts with the androgen receptor (AR) through an LxxLL-dependent mechanism.
  • BTG2 modulates AR signaling and inhibits prostate cancer cell growth, suggesting a therapeutic role.

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