p53 regulates FAK expression in human tumor cells

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Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

Vita M Golubovskaya1, Richard Finch, Frederick Kweh

  • 1Department of Surgery, University of Florida, Gainesville, USA.

Molecular Carcinogenesis
|November 14, 2007
PubMed

Insights

The tumor suppressor p53 protein normally inhibits focal adhesion kinase (FAK) expression. Mutations in p53 disrupt this regulation, leading to increased FAK, a marker of cancer progression.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Genetics

Background:

  • p53 protein is frequently abnormal in human tumors.
  • Focal Adhesion Kinase (FAK) is overexpressed in various cancers and regulates cell adhesion, motility, metastasis, and survival.
  • FAK plays a critical role in tumorigenesis.

Purpose of the Study:

  • To investigate the regulatory relationship between p53 and FAK.
  • To determine if p53 directly binds to and inhibits the FAK promoter.
  • To assess the impact of p53 mutations on FAK expression in cancer.

Main Methods:

  • Chromatin immunoprecipitation (ChIP) assay to detect p53 binding to the FAK promoter in vivo.
  • Adenoviral overexpression of wild-type p53 to assess FAK mRNA and protein levels.
  • Introduction of mutant p53 plasmids into p53-deficient cells to evaluate FAK promoter activity.
  • Analysis of p53 mutations and FAK expression in primary breast and colon cancer samples.

Main Results:

  • p53 binds to the FAK promoter region in vivo.
  • Overexpression of wild-type p53 down-regulates FAK mRNA and protein.
  • Mutations in the p53 DNA-binding domain (e.g., R175H, R248W, R273H) prevent FAK promoter binding and inhibition.
  • FAK expression is elevated in human tumors with mutated p53 compared to those with wild-type p53.
  • Specific tumor-derived p53 mutations increase FAK promoter activity.

Conclusions:

  • p53 directly regulates FAK expression by binding to its promoter.
  • Mutations in p53 impair its ability to inhibit FAK, contributing to increased FAK levels in cancer.
  • This p53-FAK regulatory axis is important in tumorigenesis and may represent a therapeutic target.

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