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c-Abl regulates p53 levels under normal and stress conditions by preventing its nuclear export and ubiquitination

R V Sionov1, S Coen, Z Goldberg

  • 1Lautenberg Center for General and Tumor Immunology, The Hebrew University Hadassah Medical School, Jerusalem 91120, Israel.

Molecular and Cellular Biology
|August 4, 2001
PubMed

Insights

The c-Abl protein is crucial for stabilizing the p53 protein in the nucleus after DNA damage. It prevents Mdm2-mediated degradation, ensuring p53 accumulates to facilitate cellular repair.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Biochemistry

Background:

  • The p53 protein, a critical tumor suppressor, is regulated by the Mdm2-mediated ubiquitin-proteasome pathway, leading to its degradation.
  • DNA damage typically stabilizes p53 in the nucleus, but the precise mechanisms remain unclear.

Purpose of the Study:

  • To elucidate the role of c-Abl in the nuclear accumulation of p53 following DNA damage.
  • To investigate how c-Abl influences p53 stability and localization in response to cellular stress.

Main Methods:

  • Investigated the interaction between c-Abl and p53 in cells exposed to DNA damage.
  • Utilized c-Abl null cells and reconstituted cells to assess the impact of c-Abl on p53 accumulation.
  • Examined the effects of c-Abl on p53 ubiquitination and nuclear export mediated by Mdm2 and HPV E6.

Main Results:

  • Demonstrated that c-Abl plays a key role in the nuclear accumulation of endogenous p53 after DNA damage.
  • Showed that c-Abl prevents Mdm2- and HPV E6-mediated ubiquitination and nuclear export of p53.
  • Confirmed that c-Abl null cells exhibit impaired p53 accumulation, which is restored upon c-Abl reconstitution.

Conclusions:

  • c-Abl is essential for the nuclear retention of p53 in response to DNA damage.
  • This mechanism involves c-Abl inhibiting p53 ubiquitination and nuclear export, thereby stabilizing p53.

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