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Detection and Visualization of DNA Damage-induced Protein Complexes in Suspension Cell Cultures Using the Proximity Ligation Assay
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FOXO3 signalling links ATM to the p53 apoptotic pathway following DNA damage

Young Min Chung1, See-Hyoung Park, Wen-Bin Tsai

  • 1Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, Stanford University School of Medicine, Stanford, CA 94305, USA.

Nature Communications
|August 16, 2012
PubMed

Insights

FOXO3 is crucial for DNA damage-induced apoptosis, interacting with the ATM-Chk2-p53 complex to trigger programmed cell death. This pathway is essential for preventing genomic instability and tumor formation.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Genetics

Background:

  • DNA damage from environmental stress activates sensor proteins to initiate repair or apoptosis.
  • Defects in DNA damage-induced apoptosis contribute to genomic instability and cancer.
  • The protein ataxia-telangiectasia mutated (ATM) is activated by double-strand breaks and regulates apoptosis via p53.

Purpose of the Study:

  • To investigate the role of FOXO3 in the DNA damage response pathway.
  • To elucidate the interaction between FOXO3 and the ATM-Chk2-p53 complex.
  • To determine FOXO3's necessity for DNA damage-induced apoptosis.

Main Methods:

  • Cellular assays to detect protein interactions and complex formation.
  • Analysis of protein phosphorylation status following DNA damage.
  • Assessment of nuclear foci formation in response to DNA damage.
  • Evaluation of apoptosis induction in the presence and absence of FOXO3.

Main Results:

  • FOXO3 interacts with the ATM-Chk2-p53 complex, enhancing its phosphorylation.
  • FOXO3 induces nuclear foci formation in cells upon DNA damage.
  • FOXO3 is essential for initiating apoptosis after DNA damage.
  • FOXO3 requires ATM, Chk2, and phosphorylated p53 to trigger apoptosis.
  • FOXO3 may regulate the chromatin retention of phosphorylated p53.

Conclusions:

  • FOXO3 plays a critical role in the ATM-Chk2-p53-mediated apoptotic pathway following DNA damage.
  • The interaction between FOXO3 and the ATM-Chk2-p53 complex is essential for effective apoptosis induction.
  • This pathway is vital for maintaining genomic stability and preventing tumorigenesis.

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