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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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Regulation of the IRF-1 tumour modifier during the response to genotoxic stress involves an ATM-dependent signalling

Jessica Pamment1, Eleanor Ramsay, Michael Kelleher

  • 1Cancer Research UK Laboratories, University of Dundee Medical School, Dundee DD1 9SY, UK.

Oncogene
|November 7, 2002
PubMed

Insights

Genotoxic stress activates the ATM-signalling pathway to induce Interferon Regulatory Factor-1 (IRF-1) and p53, crucial for DNA damage response. This contrasts with the JAK/STAT pathway used during viral infections.

Area of Science:

  • Molecular Biology
  • Cellular Signaling
  • Cancer Research

Background:

  • The precise mechanisms by which genotoxic stress triggers Interferon Regulatory Factor-1 (IRF-1) induction remain unclear.
  • Understanding upstream signaling components is vital for elucidating the DNA damage response pathway involving IRF-1.

Purpose of the Study:

  • To investigate the role of ATM kinase in the induction of IRF-1 during DNA damage.
  • To explore the coordinated regulation of IRF-1 and p53 in response to genotoxic stress.
  • To differentiate the signaling pathways controlling IRF-1 in response to DNA damage versus viral mimetics.

Main Methods:

  • Utilized ionizing radiation (IR) and etoposide to induce genotoxic stress in ATM-deficient and ATM-positive cells.
  • Assessed IRF-1 mRNA and protein levels.
  • Investigated the effect of ATM re-expression and PI-3 kinase inhibition (wortmannin) on IRF-1 induction.

Main Results:

  • IRF-1 and p53 are coordinately upregulated in an ATM-dependent manner following DNA damage.
  • ATM-deficient cells exhibit a significant defect in IRF-1 induction by genotoxic stress, but not viral mimetics.
  • ATM kinase activity is essential for DNA damage-induced IRF-1 expression and stability.

Conclusions:

  • The ATM kinase plays a critical role in orchestrating the coordinated induction and transcriptional cooperation of IRF-1 and p53 to regulate p21 expression.
  • IRF-1 is regulated by distinct signaling pathways: JAK/STAT for viral infections and ATM for DNA damage.

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