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The p75(NTR) tumor suppressor induces cell cycle arrest facilitating caspase mediated apoptosis in prostate tumor

Fatima Khwaja1, Arshia Tabassum, Jeff Allen

  • 1Department of Biochemistry and Molecular and Cellular Biology, Georgetown University Medical Center, Washington, DC 20057-1436, USA.

Biochemical and Biophysical Research Communications
|February 8, 2006
PubMed

Insights

The p75 neurotrophin receptor (p75(NTR)) halts prostate cancer cell proliferation and induces apoptosis. Nerve growth factor (NGF) acts as a survival factor, counteracting p75(NTR)

Area of Science:

  • Molecular biology
  • Cell biology
  • Cancer research

Background:

  • The p75 neurotrophin receptor (p75(NTR)) is a member of the tumor necrosis factor receptor superfamily.
  • p75(NTR) functions as a death receptor, influencing cell fate.

Purpose of the Study:

  • To investigate the role of p75(NTR) in prostate cancer cell cycle progression and apoptosis.
  • To elucidate the mechanisms of p75(NTR)-mediated anti-proliferative and pro-apoptotic activities.

Main Methods:

  • Cell cycle analysis using flow cytometry.
  • Dominant-negative antagonist (DeltaDD) to inhibit p75(NTR) function.
  • Assessment of apoptosis via nuclear fragmentation and caspase activation.
  • Treatment with Nerve Growth Factor (NGF) ligand.

Main Results:

  • p75(NTR) expression caused cell cycle arrest at G0/G1 and reduced S phase.
  • The death domain of p75(NTR) mediated ligand-independent anti-proliferative effects.
  • NGF ligand rescued cell cycle progression and modulated cyclin/cdk holoenzyme complex.
  • p75(NTR) induced apoptosis via the intrinsic mitochondrial pathway (caspase-9/-7 cascade) in a ligand-independent manner.
  • The DeltaDD antagonist blocked p75(NTR)-induced apoptosis, confirming its integral role.
  • NGF acted as a survival factor, ameliorating p75(NTR)-dependent apoptosis.

Conclusions:

  • p75(NTR) plays a dual role in prostate cancer, inhibiting proliferation and inducing apoptosis.
  • The death domain is critical for p75(NTR)'s anti-proliferative and apoptotic functions.
  • NGF acts as a survival factor for p75(NTR)-expressing prostate cancer cells, opposing its pro-apoptotic effects.

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