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Updated: Jun 25, 2025

Techniques to Induce and Quantify Cellular Senescence
06:51

Techniques to Induce and Quantify Cellular Senescence

Published on: May 1, 2017

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The p21CIP1-CDK4-DREAM axis is a master regulator of genotoxic stress-induced cellular senescence

Ariane Schmidt1, Sebastian Allmann1, Christian Schwarzenbach1

  • 1Department of Toxicology, University Medical Center of the Johannes Gutenberg University of Mainz, Obere Zahlbacher Str. 67, D-55131 Mainz, Germany.

Nucleic Acids Research
|May 23, 2024
PubMed

Insights

Cellular senescence, driven by DNA damage, is regulated by p21CIP1, CDK4, and the DREAM complex. This pathway silences proliferation factors, controlling genotoxic stress-induced senescence.

Area of Science:

  • Cellular and Molecular Biology
  • Genetics and Epigenetics
  • Aging Research

Background:

  • Cellular senescence is a key aging mechanism triggered by DNA damage.
  • The DNA repair machinery counteracts senescence.
  • p16INK4a-deficient cells provide a model to study senescence induction.

Purpose of the Study:

  • To elucidate the molecular mechanisms regulating genotoxic stress-induced senescence.
  • To identify key regulators in the senescence pathway.
  • To understand the role of p21CIP1 in senescence induction and maintenance.

Main Methods:

  • Immunoprecipitation-based mass spectrometry interactomics.
  • Genome-wide transcriptomics.
  • Live-cell time-lapse microscopy.
  • Gene knockdown experiments.

Main Results:

  • Senescence induction by B[a]P or IR in p16INK4a-deficient cells depends on p21CIP1.
  • p21CIP1 inhibits CDK4, activating the DREAM complex.
  • The DREAM complex silences proliferation factors (E2F1, FOXM1, B-Myb) and DNA repair genes.
  • B[a]P and IR induce similar transcriptional responses, largely overlapping with CDK4 inhibition.
  • p21CIP1-mediated CDK4 inhibition is crucial for arresting cells post-mitosis.

Conclusions:

  • The p21CIP1/CDK4/DREAM axis is a master regulator of genotoxic stress-induced senescence.
  • This pathway plays a critical role in cell cycle arrest following DNA damage.
  • Understanding this axis offers insights into aging and cancer biology.

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