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Specific positive and negative effects of FLIP on cell survival in human prostate cancer

Keiji Shimada1, Mitsutoshi Nakamura, Syuichi Matsuyoshi

  • 1Department of Pathology, Nara Medical University School of Medicine, Nara, 634-8521, Japan.

Carcinogenesis
|March 16, 2006
PubMed

Insights

FLICE-like inhibitory protein (FLIP) has dual roles in prostate cancer. It promotes metastasis by stabilizing beta-catenin but enhances proteasome inhibitor-induced apoptosis via the Raf-1/p38 pathway.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • FLICE-like inhibitory protein (FLIP) role in cancer is complex.
  • Prostate cancer progression involves cell survival and invasion.
  • Proteasome inhibitors are investigated for cancer therapy.

Purpose of the Study:

  • To elucidate the multifaceted roles of FLIP in human prostate cancer.
  • To investigate FLIP's interaction with proteasome inhibitors and its impact on cell signaling.
  • To determine FLIP's contribution to prostate cancer metastasis and survival.

Main Methods:

  • Cell culture and treatment with proteasome inhibitor MG132.
  • Western blotting to assess protein levels and interactions (FLIP, beta-catenin, cyclin D1, Raf-1, p38).
  • Immunohistochemistry and in vitro assays for colony formation and invasion.
  • FLIP knockdown experiments.

Main Results:

  • MG132 induced G2/M arrest and apoptosis via p38 activation.
  • MG132 stabilized FLIP, enhancing Raf-1/p38 signaling and cytotoxicity.
  • Overexpressed FLIP inhibited beta-catenin ubiquitylation, increasing cyclin D1, colony formation, and invasion.
  • FLIP overexpression correlated with beta-catenin/cyclin D1 in metastatic cells.
  • FLIP knockdown reversed pro-metastatic effects.
  • FLIP reduction inhibited MG132-induced apoptosis.

Conclusions:

  • FLIP promotes prostate cancer metastasis by inhibiting beta-catenin proteasomal degradation.
  • FLIP mediates proteasome inhibitor-induced apoptosis through the Raf-1/p38 pathway.
  • FLIP is a potential therapeutic target, and proteasome inhibitors may benefit advanced prostate cancers overexpressing FLIP.

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