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Updated: Sep 28, 2025

Techniques to Induce and Quantify Cellular Senescence
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p52 signaling promotes cellular senescence.

Giovanna M Bernal1, Longtao Wu1, David J Voce1

  • 1Department of Neurological Surgery, The University of Chicago, Chicago, IL, 60637, USA.

Cell & Bioscience
|April 5, 2022
PubMed
Summary

The p52 subunit of nuclear factor-κB (NF-κB) drives cellular senescence. Factors in conditioned media activate p52, which then induces senescence, contributing to organismal aging.

Keywords:
CYPANF-κBS100A4STAT3Senescencep52

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Aging Research

Background:

  • Nuclear factor-κB (NF-κB) is a key transcription factor in cellular senescence.
  • Previous work indicated elevated p52 subunit levels in senescent cells and aged tissues.

Purpose of the Study:

  • Investigate the mechanism of p52 activation in senescence.
  • Determine if increased p52 promotes cellular senescence.

Main Methods:

  • Utilized primary mouse embryonic fibroblasts (MEFs) and WI-38 human lung fibroblasts.
  • Overexpressed p52, used peptide inhibitor SN52, performed mass spectrometry, and conducted genome-wide ChIP-sequencing.
  • Assessed STAT3 signaling activation and conditioned media (CM) protein requirements.

Main Results:

  • Increased nuclear p52 observed in senescent cells, independent of NFKB2 mRNA or IKKα/NIK levels.
  • Overexpression of p52 induced significant senescence; blocking nuclear translocation reduced senescence markers.
  • Conditioned media proteins (S100A4, CYPA) and STAT3 activation were essential for p52 induction.
  • ChIP-sequencing confirmed increased p52 chromatin enrichment and identified downstream targets.

Conclusions:

  • p52 nuclear translocation is upregulated in senescent cells via conditioned media factors.
  • Mature p52 directly induces cellular senescence.
  • Findings support p52's role in organismal aging.