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Related Experiment Videos

A mutant p53 that discriminates between p53-responsive genes cannot induce apoptosis

P Friedlander1, Y Haupt, C Prives

  • 1Department of Biological Sciences, Columbia University, New York 10027, USA.

Molecular and Cellular Biology
|September 1, 1996
PubMed
Summary

Temperature affects tumor suppressor p53 (mutant Ala-143) activity. While inactive at 37°C, this mutant strongly activates transcription at 32°C but fails to induce apoptosis, suggesting differential promoter regulation.

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Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • Wild-type p53 (wt p53) induces apoptosis in H1299 cells at 37°C.
  • Tumor-derived mutant p53 proteins (e.g., Ala-143, His-175, Trp-248) typically fail to induce apoptosis.
  • The transcriptional activity of mutant p53 can be influenced by temperature.

Purpose of the Study:

  • To investigate the temperature-dependent transcriptional activity and apoptotic function of a specific mutant p53 (p53Ala143).
  • To explore the relationship between p53 transcriptional activity and apoptosis induction.
  • To determine if different p53-responsive promoters are regulated differentially.

Main Methods:

  • Transient transfection of H1299 cells with wild-type and mutant p53 constructs.

Related Experiment Videos

  • Culturing cells at different temperatures (37°C and 32°C).
  • Assessing transcriptional activity using p53-responsive reporter gene assays (e.g., Bax, IGFBP3 promoters).
  • Evaluating apoptosis induction.

    • Main Results:

    • At 37°C, p53Ala143 was transcriptionally inactive.
    • At 32°C, p53Ala143 exhibited strong transcriptional activation of multiple promoters, comparable to or exceeding wt p53.
    • Despite enhanced transcription at 32°C, p53Ala143 showed a defect in inducing apoptosis and activating pro-apoptotic gene promoters (Bax, IGFBP3).

    Conclusions:

    • Mutant p53 transcriptional activity and apoptotic function can be differentially regulated by temperature.
    • The findings suggest the existence of distinct classes of p53-responsive promoters.
    • Differential promoter regulation by p53 may have significant functional implications for cell fate decisions in cancer.