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Related Experiment Video

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Functional interplay between p53 and Δ133p53 in adaptive stress response.

Lu Gong1,2, Xiao Pan3, Gamze K Abali1,2

  • 1Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, MA, 02115, USA.

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The tumor suppressor p53 can promote cell survival, not just death. A novel mechanism reveals how p53 isoform Δ133p53 switches p53

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Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Cancer Research

Background:

  • The tumor suppressor protein p53 is known for its role in inducing apoptosis (programmed cell death).
  • However, p53 also plays a role in promoting cell survival, a function that is not fully understood.
  • The existence of p53 isoforms, such as Δ133p53, adds complexity to p53's diverse cellular functions.

Purpose of the Study:

  • To elucidate the mechanism by which p53's function shifts between promoting cell death and cell survival.
  • To investigate the role of the p53 isoform Δ133p53 in mediating this functional switch.
  • To understand how stress levels influence the p53-Δ133p53 interaction and subsequent cell fate decisions.

Main Methods:

  • Investigated the interaction between p53 and its isoform Δ133p53.
  • Utilized stress induction models to study the expression of Δ133p53 via HIF1-dependent pathways.
  • Analyzed p53 binding dynamics at the Bcl2 promoter and its impact on Bcl2 gene expression.
  • Conducted experiments in mice to assess the protective effects of mild stress pre-treatment against DNA damage agents.

Main Results:

  • Mild or moderate stress induces the p53 isoform Δ133p53 through an HIF1-dependent mechanism.
  • Increased Δ133p53 levels shift p53 binding at the Bcl2 promoter, leading to Bcl2 induction.
  • Pre-treatment with mild stress in mice induced Δ133p53 and Bcl2, conferring protection against DNA damage toxicity.

Conclusions:

  • A novel interplay between p53 and Δ133p53 determines cell fate (survival or death) in response to stress.
  • Δ133p53 mediates an adaptive response by promoting cell survival under specific stress conditions.
  • This finding reveals a new layer of regulation in the p53 pathway crucial for cellular resilience.