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Laser-capture Microdissection of Human Prostatic Epithelium for RNA Analysis
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cDNA microarray analysis identifies genes induced in common by peptide growth factors and androgen in human prostate

Timothy P York1, Stephen R Plymate, Peter S Nelson

  • 1Massey Cancer Center, Virginia Commonwealth University, Richmond, Virginia 23298, USA.

Molecular Carcinogenesis
|October 22, 2005
PubMed

Insights

Prostate cancer cells can become resistant to androgen ablation by utilizing growth factors like IGF or EGF. This study identified 20 genes common to androgen and growth factor signaling, offering new insights into prostate cancer recurrence.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Prostate cancer cells initially depend on androgens but often develop androgen independence, leading to treatment resistance and recurrence.
  • Signaling pathways downstream of androgen receptor (AR), insulin-like growth factor 1 (IGF-1) receptor, and epidermal growth factor (EGF) receptor may mediate survival in androgen-independent cells.

Purpose of the Study:

  • To identify genes in prostate epithelial cells that are similarly induced by androgens and growth factors (IGF or EGF) over time.
  • To investigate potential alternative signaling pathways driving prostate cancer proliferation.

Main Methods:

  • Development and application of prostate-specific cDNA microarrays containing 6373 prostate-derived cDNA clones.
  • Exposure of AR-positive and AR-negative M12 prostate epithelial cells to dihydrotestosterone (DHT), EGF, or IGF for 0, 6, or 24 hours.
  • Analysis of gene expression changes using microarrays and validation by RT-PCR for selected genes.

Main Results:

  • Identified 20 genes with statistically significant induction in common after 6 and 24 hours of exposure to androgens or growth factors.
  • Validated microarray findings for genes including v-myc, isocitrate dehydrogenase, and calnexin using RT-PCR.
  • Found androgen response element binding motifs in the upstream sequences of 16 of the 20 identified genes.

Conclusions:

  • Peptide growth factors like IGF and EGF can provide alternative signaling pathways for prostate epithelial cell proliferation, potentially contributing to androgen independence.
  • The identified genes and their regulation by both androgens and growth factors offer novel insights into prostate cancer progression and therapeutic targets.

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