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DNA damage induces two distinct modes of cell death in ovarian carcinomas

H Vakifahmetoglu1, M Olsson, C Tamm

  • 1Division of Toxicology, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.

Cell Death and Differentiation
|December 8, 2007
PubMed

Insights

Functional p53 acts as a crucial switch, directing ovarian cancer cells towards either apoptosis or mitotic catastrophe following DNA damage. This research highlights p53

Area of Science:

  • Cell Biology
  • Molecular Oncology
  • Cancer Research

Background:

  • Cellular stress activates p53, leading to cell cycle arrest or apoptosis.
  • Impaired cell cycle arrest can result in mitotic catastrophe, a distinct form of cell death.
  • Ovarian carcinoma cell lines provide a model to study DNA damage response pathways.

Purpose of the Study:

  • Investigate the roles of p53 and caspase-2 in apoptosis and mitotic catastrophe.
  • Determine how p53 influences cell fate decisions after cisplatin treatment.
  • Elucidate the mechanisms underlying DNA damage-induced cell death in ovarian cancer.

Main Methods:

  • Cisplatin treatment of ovarian carcinoma cell lines.
  • Assessment of p53 and caspase-2 functionality.
  • Analysis of cell cycle progression and cell death morphology.
  • Restoration of p53 function via transient expression.
  • Inhibition of Chk2 and evaluation of 14-3-3sigma deficiency.

Main Results:

  • Functional p53 and caspase-2 are essential for cisplatin-induced apoptosis.
  • Apoptosis is preceded by nuclear caspase-2 translocation to the cytoplasm.
  • Loss of functional p53 leads to caspase-2-independent mitotic catastrophe and necrosis.
  • Restoration of wild-type p53 re-establishes apoptotic cell death.
  • Chk2 inhibition or 14-3-3sigma deficiency sensitizes cells to mitotic catastrophe, but apoptosis remains the ultimate outcome.

Conclusions:

  • p53 acts as a critical regulator, determining cell fate between apoptosis and mitotic catastrophe in response to DNA damage.
  • The interplay between p53, caspase-2, and cell cycle regulators dictates the mode of cell death in ovarian cancer.
  • Understanding these pathways offers potential therapeutic targets for ovarian cancer treatment.

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