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Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death
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Inflammatory cytokines and survival factors from serum modulate tweak-induced apoptosis in PC-3 prostate cancer cells

Ana Belen Sanz1, Maria Dolores Sanchez-Niño, Susana Carrasco

  • 1Nefrologia, IdiPAZ, Madrid, Spain.

Plos One
|October 19, 2012
PubMed

Insights

Tumor necrosis factor-like weak inducer of apoptosis (TWEAK) activates the Fn14 receptor, promoting apoptosis in androgen-independent prostate cancer cells. This TWEAK/Fn14 pathway shows therapeutic potential for prostate cancer treatment.

Area of Science:

  • Oncology
  • Molecular Biology
  • Immunology

Background:

  • Prostate cancer progression is complex, with limited understanding of TWEAK/Fn14 pathway roles.
  • Tumor necrosis factor-like weak inducer of apoptosis (TWEAK) is a TNF superfamily member that activates the Fn14 receptor.
  • TWEAK signaling is implicated in cell death, survival, and proliferation, but its function in prostate cancer remains largely unexplored.

Purpose of the Study:

  • To investigate the expression and function of the TWEAK/Fn14 system in human prostate cancer.
  • To determine the role of TWEAK in inducing apoptosis in different prostate cancer cell lines.
  • To evaluate the therapeutic potential of targeting the TWEAK/Fn14 pathway in prostate cancer.

Main Methods:

  • Analysis of Fn14 expression in human prostate adenocarcinoma biopsies and cell lines (PC-3 and LNCaP).
  • Treatment of cell lines with TWEAK, inflammatory cytokines (TNFα/IFNγ), and bovine fetal serum to assess Fn14 regulation and apoptosis induction.
  • Assessment of apoptosis markers including caspase-3 activation, cytochrome C release, and Bax/BclxL ratio.

Main Results:

  • Fn14 expression is elevated in human prostate adenocarcinoma and constitutively expressed in both PC-3 and LNCaP cell lines, with higher levels in PC-3 cells.
  • Fn14 expression was upregulated in PC-3 cells by inflammatory cytokines and fetal bovine serum.
  • TWEAK induced apoptosis in androgen-independent PC-3 cells, but not in LNCaP cells, with enhanced apoptosis upon co-stimulation with TNFα/IFNγ. TWEAK-induced apoptosis was mediated via Fn14 receptor activation, caspase-3, and mitochondrial pathways.

Conclusions:

  • The TWEAK/Fn14 pathway is present and active in human prostate cancer.
  • TWEAK/Fn14 pathway activation promotes apoptosis in androgen-independent prostate cancer cells under specific conditions.
  • Further research into the TWEAK/Fn14 pathway as a therapeutic target for prostate cancer is warranted.

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