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BTG2 antagonizes Pin1 in response to mitogens and telomere disruption during replicative senescence

Keith Wheaton1, Jennifer Muir, Weili Ma

  • 1Department of Biology, York University, Toronto, Ontario, Canada. kwheaton@yorku.ca

Aging Cell
|June 24, 2010
PubMed

Insights

The gene BTG2 is crucial for cellular senescence, a process that prevents cancer. BTG2 depletion extends cell lifespan, while its presence induces senescence independently of p53, revealing a new anti-cancer mechanism.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Oncology

Background:

  • Cellular senescence limits cell proliferation and prevents cancer.
  • Replicative senescence is linked to telomere shortening and the ATM-p53-p21 pathway.
  • Other genes likely contribute to the senescence process.

Purpose of the Study:

  • To investigate the role of the p53-responsive gene BTG2 in cellular senescence.
  • To elucidate the mechanism by which BTG2 regulates cell proliferation and senescence.

Main Methods:

  • Depletion and ectopic expression of BTG2 in human fibroblasts.
  • Analysis of cellular lifespan and senescence induction.
  • Investigation of BTG2 interaction with prolyl isomerase Pin1.

Main Results:

  • BTG2 depletion extended cellular lifespan, mimicking p53 or p21 depletion.
  • Ectopic BTG2 induced senescence independently of p53.
  • BTG2 stabilization and Pin1 relocalization were observed during telomere dysfunction.
  • Pin1 inhibition induced senescence, while Pin1 overexpression rescued BTG2-induced senescence.

Conclusions:

  • BTG2 plays an essential role in replicative senescence.
  • BTG2 neutralizes Pin1, maintaining senescent arrest against mitogenic signals.
  • This BTG2-Pin1 interaction represents a novel mechanism in cancer prevention.

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