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Updated: Jul 14, 2026

Techniques to Induce and Quantify Cellular Senescence
06:51

Techniques to Induce and Quantify Cellular Senescence

Published on: May 1, 2017

DNA damage-induced cellular senescence is sufficient to suppress tumorigenesis: a mouse model

Thang Van Nguyen1, Nahum Puebla-Osorio, Hui Pang

  • 1Department of Immunology, the University of Texas M.D. Anderson Cancer Center, Houston, TX 77030, USA.

The Journal of Experimental Medicine
|May 31, 2007
PubMed

Insights

Tumor suppressor p53-dependent cell cycle arrest, not apoptosis, prevents lymphoma. In mice lacking DNA repair (NHEJ) and with defective p53 apoptosis, cell cycle arrest and senescence suppressed tumor formation.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cancer Research

Background:

  • Tumor suppressor p53-mediated apoptosis is crucial for preventing cancer.
  • DNA double-strand breaks (DSBs) at V(D)J recombination loci in lymphocytes of nonhomologous end-joining (NHEJ)-deficient, p53-deficient mice cause genomic instability and rapid lymphomagenesis.

Purpose of the Study:

  • To investigate the role of p53-dependent cell cycle arrest in suppressing tumorigenesis when apoptosis is impaired.
  • To determine if cell cycle arrest can prevent lymphoma development in the context of genomic instability.

Main Methods:

  • Crossbreeding NHEJ-deficient mice with mice carrying a mutant p53R172P allele, which impairs apoptosis but not cell cycle arrest.
  • Analyzing tumor development, survival rates, DNA damage, protein expression (mutant p53, p21, PUMA), and cell senescence in double-mutant mice.
  • Performing cytogenetic studies to assess chromosomal integrity.

Main Results:

  • Double-mutant mice (NHEJ-deficient, p53R172P) survived longer and remained tumor-free compared to NHEJ/p53 double-null mice.
  • Aberrant V(D)J recombination-related DSBs accumulated at the TCR locus.
  • High expression of mutant p53 and p21 was observed, alongside significant senescence in thymocytes and bone marrow cells.
  • Lymphoid cells showed euploidy and limited chromosomal breaks.

Conclusions:

  • p53-p21-dependent cell cycle arrest and senescence are sufficient to prevent lymphomagenesis.
  • Precursor lymphocytes can withdraw from the cell cycle and undergo senescence in response to persistent DSBs.
  • This pathway effectively inhibits oncogenic chromosomal abnormalities and suppresses tumor formation.

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