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ID4 promotes AR expression and blocks tumorigenicity of PC3 prostate cancer cells

Shravan Kumar Komaragiri1, Dhanushka H Bostanthirige1, Derrick J Morton1

  • 1Department of Biology and Center for Cancer Research and Therapeutics Development, Clark Atlanta University, Atlanta, GA 30314, United States.

Biochemical and Biophysical Research Communications
|July 28, 2016
PubMed

Insights

The tumor suppressor ID4, when overexpressed in prostate cancer cells, reduces cell growth and migration. This ID4 activity is linked to increased androgen receptor (AR) signaling, suggesting a therapeutic target.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Genetics

Background:

  • Tumor suppressor gene deregulation drives cancer development.
  • ID4 functions as a tumor suppressor in prostate cancer, often epigenetically silenced.
  • ID4 interacts with androgen receptor (AR) and p53 in normal prostate cells.

Purpose of the Study:

  • To investigate the effects of ID4 overexpression in the highly malignant PC3 prostate cancer cell line.
  • To elucidate the molecular mechanisms underlying ID4's tumor-suppressive role in prostate cancer.

Main Methods:

  • Stable overexpression of ID4 in PC3 prostate cancer cells.
  • In vitro assays for cell proliferation, apoptosis, and migration.
  • In vivo studies using nude mice xenografts.
  • Molecular analysis of AR, p21, and FKBP51 expression.

Main Results:

  • ID4 overexpression in PC3 cells significantly decreased cell proliferation and migration while increasing apoptosis.
  • In vivo studies demonstrated reduced tumor size and volume in ID4-overexpressing xenografts.
  • Molecularly, ID4 upregulation correlated with increased expression of AR, p21, and AR-dependent FKBP51.

Conclusions:

  • Ectopic ID4 expression exhibits potent tumor-suppressive effects in highly aggressive prostate cancer cells (PC3).
  • ID4's function involves modulating AR signaling pathways, including p21 and FKBP51, suggesting a complex regulatory role.
  • ID4 may influence AR function through novel co-regulators, offering potential therapeutic strategies for prostate cancer.
Keywords:
ADTARApoptosisCancerFKBP51ID4MigrationbHLHp21

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