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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

The CCN3 gene coding for an extracellular adhesion-related protein is transcriptionally activated by the p53 tumor

Levin Böhlig1, Roman Metzger, Karen Rother

  • 1Universitätsfrauenklinik Leipzig, Universität Leipzig, Germany.

Cell Cycle (Georgetown, Tex.)
|April 18, 2008
PubMed

Insights

The tumor suppressor p53 directly upregulates CCN3 gene expression, impacting cell growth and adhesion. This p53-CCN3 interaction reveals a novel pathway for controlling cell proliferation and extracellular matrix interactions.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • The CCN3 protein (Nephroblastoma overexpressed) is a CCN family member with known antiproliferative effects.
  • The tumor suppressor p53 is a critical transcription factor involved in cell cycle arrest and apoptosis.
  • Understanding the regulatory network of p53 is crucial for cancer research.

Purpose of the Study:

  • To investigate the transcriptional regulation of the CCN3 gene by the tumor suppressor p53.
  • To elucidate the functional consequences of p53-mediated CCN3 induction on cellular processes.

Main Methods:

  • Analysis of CCN3 mRNA and protein levels following p53 induction.
  • Utilizing a DNA binding-deficient p53 mutant to assess p53's role in CCN3 regulation.
  • Reporter assays to identify the p53 response element in the CCN3 promoter.
  • Chromatin immunoprecipitation assays to confirm p53 binding to the CCN3 promoter in vivo.

Main Results:

  • p53 directly upregulates CCN3 gene transcription and protein expression.
  • A functional DNA-binding domain of p53 is essential for CCN3 induction.
  • The CCN3 promoter contains a p53-inducible response element located in the first exon.
  • p53 binds to the CCN3 promoter in vivo, confirmed by chromatin immunoprecipitation.
  • CCN3 protein localizes to the perinuclear space and is secreted into the extracellular matrix.

Conclusions:

  • p53 transcriptionally induces CCN3, potentially mediating an antiproliferative signal.
  • p53-regulated CCN3 may influence cell adhesion, particularly in the context of collagen type IV.
  • This study reveals a novel regulatory axis where p53 controls CCN3 expression, impacting cell growth and adhesion.

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