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ATF3 regulates the stability of p53: a link to cancer

Chunhong Yan1, Douglas D Boyd

  • 1Department of Cancer Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA.

Cell Cycle (Georgetown, Tex.)
|April 22, 2006
PubMed

Insights

Activating transcription factor 3 (ATF3) stabilizes the tumor suppressor p53, enhancing DNA damage response and genomic integrity. ATF3 dysfunction impairs this response, promoting cancer development.

Area of Science:

  • Molecular Biology
  • Cellular Stress Response
  • Oncology

Background:

  • Activating transcription factor 3 (ATF3) is a transcription factor involved in cellular stress responses, but its precise functions and regulation are not fully understood.
  • While ATF3 is known to regulate gene transcription during stress, only a few target genes have been identified.
  • The interaction between ATF3 and the tumor suppressor p53 in the context of genotoxic stress has been recently investigated.

Purpose of the Study:

  • To elucidate the role of ATF3 in the cellular response to DNA damage.
  • To investigate the functional significance of the interaction between ATF3 and p53.
  • To understand the implications of ATF3 dysfunction in cancer development.

Main Methods:

  • The study likely involved molecular biology techniques to investigate protein-protein interactions (ATF3 and p53) and gene expression.
  • Cellular assays were probably used to assess DNA damage response, cell stability, and transformation.
  • Analysis of ATF3 expression levels in human cancer samples was likely performed.

Main Results:

  • ATF3 interacts with p53, increasing its stability during genotoxic stress.
  • This interaction enhances the tumor suppressor function of p53, promoting cellular response to DNA damage.
  • ATF3 dysfunction compromises the p53-mediated DNA damage response, facilitating oncogene-induced cell transformation.
  • Downregulated ATF3 expression is observed in most human cancers, correlating with impaired genomic integrity.

Conclusions:

  • ATF3 plays a crucial role in maintaining genomic integrity by stabilizing p53 and supporting its tumor suppressor functions.
  • The ATF3-p53 pathway is vital for countering DNA damage and preventing malignant transformation.
  • Dysregulation of ATF3 contributes to cancer development by impairing the DNA damage response.

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