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Protein kinase G II-mediated proliferative effects in human cultured prostatic stromal cells

Anna-Louise M Cook1, John M Haynes

  • 1Department of Pharmaceutical Biology and Pharmacology, Victorian College of Pharmacy, Monash University, 381 Royal Parade, Parkville, Melbourne, Victoria 3052, Australia. anna.cook@vcp.monash.edu.au

Cellular Signalling
|November 26, 2003
PubMed

Insights

Activation of protein kinase G (PKG) II, but not PKG I, inhibits human prostatic stromal cell proliferation. PKG II activation induces apoptosis, suggesting a therapeutic target for prostate conditions.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Pharmacology

Background:

  • Prostatic stromal cells play a role in prostate physiology and pathology.
  • Protein kinase G (PKG) signaling pathways are implicated in cellular functions, including proliferation and apoptosis.
  • Understanding PKG's role in prostatic stromal cells could reveal therapeutic targets.

Purpose of the Study:

  • To investigate the effects of protein kinase G (PKG) activation on the proliferation of human cultured prostatic stromal cells.
  • To determine the specific PKG isoforms involved in regulating prostatic stromal cell growth.
  • To explore the potential of PKG modulation as a therapeutic strategy.

Main Methods:

  • Treatment of human prostatic stromal cells with PKG activators (8-pCPT-cGMP, APT-cGMP, PET-cGMP) and a phosphodiesterase inhibitor (zaprinast).
  • Assessment of cell proliferation using fetal calf serum-stimulated assays.
  • Evaluation of apoptosis markers, including atypical nuclei and annexin-V staining.
  • Use of specific PKG inhibitors (Rp-8-Br-cGMPS, Rp-8-pCPT-cGMP, Rp-cAMPS) to confirm pathway involvement.

Main Results:

  • The PKG II activator 8-pCPT-cGMP and zaprinast significantly reduced prostatic stromal cell proliferation.
  • PKG I activators (APT-cGMP, PET-cGMP) did not affect proliferation.
  • 8-pCPT-cGMP and zaprinast treatment led to increased atypical nuclei and annexin-V staining, indicating apoptosis.
  • The effects of 8-pCPT-cGMP were specifically blocked by PKG II-selective inhibitors.

Conclusions:

  • Activation of the PKG II isoform induces apoptosis in human cultured prostatic stromal cells.
  • PKG II signaling represents a potential therapeutic target for conditions involving prostatic stromal cell proliferation.
  • These findings contribute to understanding the molecular mechanisms regulating prostate stromal cell fate.

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