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Updated: Sep 30, 2026

Detection and Visualization of DNA Damage-induced Protein Complexes in Suspension Cell Cultures Using the Proximity Ligation Assay
13:10

Detection and Visualization of DNA Damage-induced Protein Complexes in Suspension Cell Cultures Using the Proximity Ligation Assay

Published on: June 9, 2017

DNA damage disrupts the p14ARF-B23(nucleophosmin) interaction and triggers a transient subnuclear redistribution of

Casey Lee1, Brian A Smith, Keya Bandyopadhyay

  • 1Department of Cancer Cell Biology, Sidney Kimmel Cancer Center, San Diego, California 92121, USA.

Cancer Research
|November 4, 2005
PubMed

Insights

DNA damage causes the p14 alternate reading frame (ARF) tumor suppressor to move from the nucleolus to the nucleoplasm, initiating its role in cancer suppression. This transient relocation is key to ARF

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • The p14 alternate reading frame (ARF) tumor suppressor is crucial in cancer, interacting with mdm2 (Hdm2 in humans) to enhance p53-mediated apoptosis.
  • The precise mechanism by which ARF initiates its role in the p53/mdm2 pathway remains unclear due to ARF's predominantly nucleolar localization versus p53 and mdm2 in the nucleoplasm.

Purpose of the Study:

  • To investigate the subnuclear distribution and protein-protein interactions of ARF following DNA damage in human tumor cells.
  • To elucidate the dynamic changes in ARF's localization and interactions during the DNA damage response.

Main Methods:

  • Immunofluorescence microscopy to visualize subnuclear localization of ARF.
  • Coimmunoprecipitation assays to identify ARF's protein-protein interactions.
  • Time-course analysis of ARF's behavior after DNA damage (irradiation).

Main Results:

  • DNA damage disrupts the ARF-B23 (nucleophosmin) interaction and triggers a transient, p53-independent translocation of ARF to the nucleoplasm.
  • This translocation masks the ARF NH2 terminus, correlating with ARF-Hdm2 complex formation, and unmasks the ARF COOH terminus, suggesting disruption of nucleolar interactions.
  • ARF localization and complexes return to pre-irradiation patterns by 24 hours post-irradiation, after DNA repair cessation.

Conclusions:

  • The nucleolus and its interactions, particularly involving the ARF COOH terminus, are implicated as sites for early DNA damage and stress-mediated events.
  • ARF redistribution is p53-independent but ARF-mediated UV sensitization requires p53 expression.
  • These findings provide insights into the early events of the ARF pathway in response to cellular stress.

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