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PDCD5-regulated cell fate decision after ultraviolet-irradiation-induced DNA damage

Changjing Zhuge1, Ying Chang, Yanjun Li

  • 1Zhou Pei-Yuan Center for Applied Mathematics, Tsinghua University, Beijing, China.

Biophysical Journal
|January 21, 2012
PubMed

Insights

Programmed cell death 5 (PDCD5) regulates cell fate after DNA damage. Mathematical modeling reveals PDCD5 promotes apoptosis via Bax translocation, with nuclear translocation potentially attenuating this response.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Systems Biology

Background:

  • Programmed cell death 5 (PDCD5) is a key regulator of apoptosis.
  • PDCD5 influences both cytoplasmic (caspase-3, Bax translocation) and nuclear (Tip60 interaction) pathways.
  • Understanding PDCD5's role in DNA damage response is crucial for cell fate determination.

Purpose of the Study:

  • To develop a mathematical model simulating PDCD5's role in switching cell response from DNA repair to apoptosis following UV-induced DNA damage.
  • To elucidate the mechanisms underlying PDCD5-mediated apoptosis and its regulation.
  • To investigate the impact of PDCD5 nuclear translocation and Tip60 interaction on cell fate.

Main Methods:

  • Development of a mathematical model integrating hypotheses and experimental data.
  • Computational simulations to analyze PDCD5-regulated cellular pathways.
  • Investigation of recombinant human PDCD5 effects on cells subjected to DNA damage.

Main Results:

  • Cellular response to DNA damage is governed by a signal threshold mechanism.
  • PDCD5-promoted Bax translocation is essential for PDCD5-regulated apoptosis.
  • PDCD5 nuclear translocation can reduce apoptosis, while Tip60 interaction accelerates it, though cell fate is ultimately insensitive to the latter.
  • Recombinant PDCD5 sensitizes cells to DNA damage by enhancing caspase-3 activity.

Conclusions:

  • PDCD5 plays a critical role in determining cell fate following DNA damage.
  • A signal threshold mechanism dictates the cell's response to DNA damage.
  • Bax translocation is a key mediator of PDCD5-induced apoptosis.
  • PDCD5's subcellular localization and interactions modulate its apoptotic function.

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