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Published on: December 7, 2014

Raf-1-induced cell cycle arrest in LNCaP human prostate cancer cells

R K Ravi1, M McMahon, Z Yangang

  • 1Department of Oncology, Johns Hopkins Medical Institutions, Baltimore, Maryland 21287, USA.

Journal of Cellular Biochemistry
|February 18, 1999
PubMed

Insights

Activating the raf/MEK/mitogen-activated protein kinase (MAPK) pathway in prostate cancer cells suppressed their growth. This suggests targeting this pathway could be a novel therapeutic strategy for prostate cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Prostate cancer is the most common cancer in men.
  • LNCaP cells model in situ prostate cancer but lack ras mutations and extensive MAPK phosphorylation.
  • The role of ras/raf/MAPK pathway activation in prostate cancer cells is not fully understood.

Purpose of the Study:

  • To investigate the effects of activating the ras/raf/MAPK pathway in LNCaP prostate cancer cells.
  • To determine if raf activation influences cell proliferation, cell cycle, and senescence.
  • To explore potential therapeutic implications of targeting the raf/MEK/MAPK pathway.

Main Methods:

  • LNCaP cells were transfected with an activatable form of c-raf-1 (deltaRaf-1:ER).
  • MAPK activation was induced by deltaRaf-1:ER.
  • Cellular responses including plating efficiency, cloning efficiency, cell cycle distribution, p21WAF1/CIP1 expression, mRNA stability, and senescence were analyzed.

Main Results:

  • Activation of deltaRaf-1:ER led to a 30-fold reduction in plating and cloning efficiency.
  • Cells accumulated in the G1 phase of the cell cycle.
  • Induction of CDK inhibitor p21WAF1/CIP1 at protein and mRNA levels, with increased mRNA stability.
  • Induced senescence-associated beta-galactosidase activity.

Conclusions:

  • Raf activation triggers growth-inhibitory pathways in prostate cancer cells.
  • MAPK pathway activation, not inhibition, may be a therapeutic target in some prostate cancers.
  • These findings offer new insights into targeting the raf/MEK/MAPK pathway for prostate cancer treatment.

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