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Purification of Ubiquitinated p53 Proteins from Mammalian Cells
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Purification of Ubiquitinated p53 Proteins from Mammalian Cells

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p53 controls cancer cell invasion by inducing the MDM2-mediated degradation of Slug

Shu-Ping Wang1, Wen-Lung Wang, Yih-Leong Chang

  • 1Graduate Institute of Life Sciences, National Defense Medical Center, Taipei 11490, Taiwan.

Nature Cell Biology
|May 19, 2009
PubMed

Insights

Wild-type p53 suppresses cancer invasion by degrading Slug protein, while mutant p53 stabilizes it. This p53-MDM2-Slug pathway impacts non-small-cell lung cancer survival and metastasis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • The tumor suppressor p53 inhibits cancer progression by controlling cell proliferation and apoptosis.
  • Slug protein promotes cancer invasion by suppressing E-cadherin transcription.
  • Aberrant p53 and Slug expression are implicated in various cancers, including non-small-cell lung cancer (NSCLC).

Purpose of the Study:

  • To investigate the role of wild-type p53 (wtp53) and mutant p53 in regulating Slug protein.
  • To elucidate the mechanism by which p53 influences cancer cell invasion and metastasis via the Slug pathway.
  • To correlate p53 mutation status with MDM2, Slug, and E-cadherin expression in NSCLC patients.

Main Methods:

  • Western blotting and co-immunoprecipitation to analyze protein interactions and degradation.
  • Quantitative real-time PCR to assess gene expression levels.
  • Analysis of patient data to correlate molecular profiles with clinical outcomes.

Main Results:

  • Wild-type p53 induces Slug degradation through the p53-MDM2-Slug complex, enhancing E-cadherin expression and reducing cancer cell invasiveness.
  • Mutant p53 proteins fail to induce Slug degradation, leading to Slug accumulation and increased invasiveness.
  • In NSCLC, p53 mutations correlate with low MDM2, high Slug, and low E-cadherin, predicting poor survival.

Conclusions:

  • The p53-MDM2-Slug pathway is a critical regulator of cancer invasion and metastasis.
  • wtp53 suppresses invasion by promoting Slug degradation, whereas mutant p53 promotes invasion by stabilizing Slug.
  • Targeting the p53-MDM2-Slug pathway may offer therapeutic strategies for NSCLC patients with p53 mutations.

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