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In good times and bad: p73 in cancer

Claudia Oswald1, Thorsten Stiewe

  • 1Department for Hematology, Oncology and Immunology, Institute for Molecular Biology and Tumor Research, Philipps-University Marburg, Marburg, Germany.

Cell Cycle (Georgetown, Tex.)
|June 28, 2008
PubMed

Insights

The tumor suppressor p73 (p73) and its p53-like isoforms (TAp73) initially block cancer progression. However, antagonists like DeltaNp73 promote full transformation, highlighting p73

Area of Science:

  • Cancer Biology
  • Molecular Oncology
  • Tumorigenesis Research

Background:

  • The tumor suppressor p53 is frequently inactivated in cancer, leading to research into its homologue, p73.
  • While p73 expression changes in tumors, mutations are rare, complicating its role in cancer development.
  • Understanding p73's function is crucial for cancer therapy development.

Purpose of the Study:

  • To investigate the role of p73 and its isoforms in human cell transformation.
  • To elucidate the regulatory mechanisms and functional significance of p73 during tumorigenesis.
  • To explore p73 as a potential therapeutic target in cancer treatment.

Main Methods:

  • Utilized an experimental model of human cell transformation.
  • Analyzed expression changes of p73 and its isoforms.
  • Correlated findings with patient data and molecular insights.

Main Results:

  • p53-like p73 isoforms (TAp73) are upregulated early in transformation, driven by RB pathway alterations.
  • TAp73 acts to block progression to a fully transformed state.
  • Dominant-negative p73 (DeltaNp73) antagonizes TAp73, facilitating full transformation.

Conclusions:

  • TAp73 functions as a tumor suppressor early in transformation.
  • DeltaNp73 acts as an antagonist, promoting malignant progression.
  • p73 and its isoforms represent promising therapeutic targets for cancer intervention.

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