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Regulation of cell cycle and RNA transcription genes identified by microarray analysis of PC-3 human prostate cancer

Kevin Shoulars1, Mary Ann Rodriguez, Trellis Thompson

  • 1Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030, USA.

The Journal of Steroid Biochemistry and Molecular Biology
|October 20, 2009
PubMed

Insights

Type II ligands, like luteolin, significantly inhibit prostate cancer cell growth by epigenetically regulating genes involved in cell cycle and RNA transcription.

Area of Science:

  • Oncology
  • Molecular Biology
  • Epigenetics

Background:

  • Prostate cancer is a leading cause of cancer deaths in men.
  • Nuclear type II [(3)H]estradiol binding site ligands, such as luteolin, show inhibitory effects on prostate cancer cells.
  • The precise molecular mechanisms of these ligands on cell growth and proliferation remain unclear.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which luteolin affects prostate cancer cell line 3 (PC-3) cells.
  • To identify specific genes and pathways regulated by luteolin treatment in PC-3 cells.
  • To investigate the role of type II ligands in epigenetic regulation of gene expression.

Main Methods:

  • cRNA microarray analysis of 38,500 genes to assess luteolin's impact on gene expression.
  • Real-time polymerase chain reactions and western blots to validate microarray findings.
  • Chromatin immunoprecipitation assays to examine histone acetylation states.

Main Results:

  • Luteolin treatment altered the expression of 3331 genes in PC-3 cells.
  • Significant downregulation of cell cycle genes (e.g., polo-like kinase 1, cyclin A2) and RNA transcription pathway genes.
  • Synthetic type II ligands (ZN-2, BMHPC) replicated luteolin's effects on gene expression.
  • Luteolin alters gene expression by modifying histone acetylation.

Conclusions:

  • Type II ligands inhibit prostate cancer cell growth and proliferation.
  • This inhibition is mediated through epigenetic control of key genes in cell cycle progression and RNA transcription.
  • Luteolin's mechanism involves altering the acetylation state of promoter-associated histones.

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