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Related Experiment Videos

Increased sequence-specific p53-DNA binding activity after DNA damage is attenuated by phorbol esters

B D Price1, S K Calderwood

  • 1Stress Protein Group, Dana-Farber Cancer Institute, Boston, Massachusetts 02115.

Oncogene
|November 1, 1993
PubMed
Summary

DNA damage rapidly increases tumor suppressor p53 protein binding to DNA, triggering cell cycle arrest. Tumor promoters like TPA can interfere with this critical DNA damage response pathway.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • The tumor-suppressor gene p53 plays a crucial role in cellular response to DNA damage.
  • Wild-type p53's function involves binding to specific DNA sequences to regulate cellular processes.
  • DNA damage is known to elevate p53 levels and induce cell cycle arrest.

Purpose of the Study:

  • To investigate the impact of DNA damage on the sequence-specific DNA-binding properties of cellular p53.
  • To determine how tumor promoters affect the p53-DNA binding activity in response to DNA damage.

Main Methods:

  • Utilized DNA gel mobility-shift assays with nuclear extracts from NIH-3T3 cells.
  • Investigated the effects of radiation-induced DNA damage and the tumor promoter TPA on p53 activity.

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  • Measured changes in p53 protein levels and half-life.

    • Main Results:

    • Radiation-induced DNA damage caused a rapid, cycloheximide-sensitive increase in nuclear p53-DNA binding activity.
    • The half-life of the p53 protein increased following DNA damage, even at low radiation doses.
    • The tumor promoter TPA decreased p53-DNA binding activity by reducing p53 protein half-life.

    Conclusions:

    • The cellular p53 response to DNA damage involves increased sequence-specific DNA binding activity.
    • Tumor promoters like TPA may exert their effects by disrupting the p53-mediated DNA damage response.
    • Elevated p53 binding to DNA post-damage likely contributes to cell cycle arrest, potentially via regulating DNA replication and cell cycle gene transcription.