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Telomerase suppression initiates PML-dependent p53 activation to inhibit bladder cancer cell growth

Yan Xue1, Lei Li, Dong Zhang

  • 1Department of Urology, Xi'an Jiaotong University, Xi'an 710061, Shaanxi, PR China.

Oncology Reports
|November 3, 2010
PubMed

Insights

Inhibiting telomerase in bladder cancer cells boosts promyelocytic leukemia protein (PML) and p53 nuclear activity. This activates a tumor-suppressing pathway, reducing cancer cell growth and promoting apoptosis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Human cancer cells often rely on telomerase activity for immortality.
  • Inhibiting telomerase is a promising cancer therapy, but downstream molecular effects are unclear.
  • Promyelocytic leukemia protein (PML) acts as a tumor suppressor in bladder cancer.

Purpose of the Study:

  • To investigate the molecular signals triggered by telomerase suppression in bladder cancer.
  • To explore the role of PML and p53 in response to telomerase inhibition.
  • To elucidate the mechanism by which telomerase suppression affects bladder cancer cell proliferation.

Main Methods:

  • Utilized mutant human telomerase reverse transcriptase (hTERT) and shRNA to inhibit telomerase activity in T24 bladder cancer cells.
  • Assessed PML expression and localization using microscopy.
  • Analyzed p53 nuclear translocation, cell cycle progression, apoptosis, and cell growth in vitro and in vivo.

Main Results:

  • Telomerase suppression led to increased PML expression and nuclear translocation.
  • p53 was recruited to the nucleus and colocalized with PML post-telomerase inhibition.
  • Inhibition resulted in reduced cell growth, cell cycle arrest, and increased apoptosis.
  • PML was found to be essential for p53 nuclear translocation and p21 induction.

Conclusions:

  • Telomerase suppression activates a PML-dependent p53 signaling pathway in bladder cancer.
  • This pathway effectively inhibits bladder cancer cell growth.
  • The study reveals potential crosstalk between PML and hTERT in bladder cancer therapy.

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