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Updated: Jun 19, 2026

Techniques to Induce and Quantify Cellular Senescence
06:51

Techniques to Induce and Quantify Cellular Senescence

Published on: May 1, 2017

Cytokine expression and signaling in drug-induced cellular senescence

Z Novakova1, S Hubackova, M Kosar

  • 1Department of Genome Integrity, Institute of Molecular Genetics, v.v.i., Academy of Sciences of the Czech Republic, Prague, Czech Republic. hodny@img.cas.cz

Oncogene
|October 6, 2009
PubMed

Insights

Genotoxic drugs induce cellular senescence by activating Janus kinase-signal transducer and activator of transcription (JAK/STAT) signaling and interferon-stimulated genes (ISGs). This highlights unique features of drug-induced senescence and its role in chemotherapy.

Area of Science:

  • Cellular and Molecular Biology
  • Oncology
  • Immunology

Background:

  • Cellular senescence is a key mechanism in tumor suppression and aging, but its precise molecular drivers are not fully understood.
  • Genotoxic drugs are known to induce cellular senescence, a state of irreversible cell cycle arrest.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying genotoxic drug-induced cellular senescence.
  • To identify specific signaling pathways and gene expression changes associated with this process.

Main Methods:

  • Treatment of human cancer cell lines with genotoxic drugs (BrdU, DMA, aphidicolin, hydroxyurea).
  • Analysis of Janus kinase-signal transducer and activator of transcription (JAK/STAT) signaling pathway activation.
  • Measurement of interferon-stimulated genes (ISGs) and cytokine expression.
  • RNA interference-mediated knockdown of JAK1.

Main Results:

  • Genotoxic drugs persistently activated JAK/STAT signaling and ISG expression in senescent cancer cells.
  • Senescent cells expressed JAK1/STAT-activating ligands, suggesting autocrine/paracrine signaling.
  • Combined BrdU and DMA treatment was the strongest inducer of senescence and JAK/STAT activation.
  • JAK1 knockdown abolished ISG expression but not senescence or DNA damage signaling.
  • IFNbeta-STAT1-ISGs axis activation was unprecedented in genotoxic drug-induced senescence.

Conclusions:

  • Genotoxic drug-induced senescence involves unique activation of the IFNbeta-STAT1-ISGs axis, distinct from oncogene-induced senescence.
  • While JAK/STAT signaling is activated, its role in genotoxic drug-induced senescence may be less prominent than previously thought.
  • These findings shed light on shared and unique aspects of drug-induced senescence and its implications for chemotherapy-induced cancer phenotypes.

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