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Two- and Three-Dimensional Live Cell Imaging of DNA Damage Response Proteins
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The p53 binding protein PDCD5 is not rate-limiting in DNA damage induced cell death

Florian J Bock1, Maria C Tanzer1, Manuel D Haschka1

  • 1Division of Developmental Immunology, Biocenter, Innsbruck Medical University, Innsbruck, Austria.

Scientific Reports
|June 12, 2015
PubMed

Insights

Programmed cell death protein 5 (PDCD5) does not appear to be essential for the DNA damage response. PDCD5 is dispensable for p53-mediated apoptosis and cell cycle arrest, suggesting a different regulatory role.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • The tumor suppressor p53 is crucial for cellular responses to DNA damage, primarily through gene transcription.
  • p53 acetylation, particularly at K120 by Tip60, influences its transcriptional activity towards pro-apoptotic genes.
  • PDCD5 has been implicated as a regulator of Tip60-dependent p53 acetylation and apoptosis.

Purpose of the Study:

  • To investigate the role of PDCD5 in the cellular response to DNA damage.
  • To determine if PDCD5 is essential for p53-mediated apoptosis and cell cycle arrest.
  • To clarify the molecular mechanism of PDCD5 in DNA damage response pathways.

Main Methods:

  • Generation of cell lines with conditionally ablated PDCD5 expression using shRNAs.
  • Exposure of these cell lines to genotoxic stress.
  • Assessment of apoptosis, cell cycle arrest, and p53 target gene transcription.
  • Confirmation of protein interactions between PDCD5, p53, and Tip60.

Main Results:

  • PDCD5 was found to be dispensable for DNA damage-induced apoptosis and cell cycle arrest.
  • No significant changes in p53 target gene transcription were observed upon PDCD5 ablation.
  • Interaction between PDCD5 and p53 was confirmed, but interaction with Tip60 was not observed.
  • PDCD5 did not play a rate-limiting role in the DNA damage response.

Conclusions:

  • PDCD5 is not essential for p53-mediated apoptosis or cell cycle arrest following DNA damage.
  • The results suggest PDCD5 may regulate p53 function through mechanisms independent of apoptosis and cell cycle arrest.
  • Further research is needed to elucidate the precise role of PDCD5 in p53 regulation in specific cellular contexts.

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