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Intercellular communication and human prostate carcinogenesis.

Giuseppe Carruba1, Rosalba Stefano, Letizia Cocciadiferro

  • 1Department of Experimental Oncology and Clinical Application, University Medical School, Palermo, Italy. lucashbl@unipa.it

Annals of the New York Academy of Sciences
|July 4, 2002
PubMed
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Defects in gap-junction-mediated intercellular communication (GJIC) are implicated in human prostate cancer. Estrone and forskolin partially restored GJIC in non-tumorigenic prostate cells by altering connexin expression, suggesting new therapeutic strategies.

Area of Science:

  • Cell Biology
  • Cancer Research
  • Molecular Biology

Background:

  • Gap-junction-mediated intercellular communication (GJIC) is crucial for tissue homeostasis and cell regulation.
  • Disruptions in GJIC are linked to carcinogenesis, but its role in human prostate cancer is unclear.
  • Connexins (Cx) form gap junction channels, with expression patterns varying by tissue and development; altered expression is common in cancer.

Purpose of the Study:

  • To investigate GJIC in human prostate epithelial cells.
  • To examine the expression and regulation of connexins Cx43 and Cx32.
  • To assess the potential of hormones and drugs to restore GJIC in prostate cells.

Main Methods:

  • Investigated GJIC in nontumorigenic (RWPE-1) and malignant (RWPE-2, LNCaP, DU-145) human prostate cells using scrape-loading/dye transfer (SL/DT) and fluorescence recovery after photobleaching (FRAP).

Related Experiment Videos

  • Analyzed Cx43 and Cx32 expression via western blot.
  • Examined the effects of estrone (E1), forskolin (FK), and Matrigel on GJIC and connexin expression.

    • Main Results:

    • Neither nontumorigenic nor malignant prostate cells exhibited functional GJIC.
    • Estrone (E1) and forskolin (FK) significantly increased GJIC in RWPE-1 cells (4.4- and 2.8-fold, respectively).
    • Matrigel also rescued GJIC activity in RWPE-1 cells. E1 increased Cx43 expression, while FK reduced Cx32 expression.

    Conclusions:

    • Agents that modulate the Cx43:Cx32 ratio may restore GJIC in junctionally deficient prostate cells.
    • These findings offer a basis for developing novel prevention and treatment strategies for human prostate cancer.
    • Targeting GJIC represents a promising avenue for prostate cancer therapy.