Cited by 68Telomeres, Telomerase, and SenescenceGenetics, Aging, and Longevity in Model OrganismsDNA Repair Mechanisms

Disappearance of the Telomere Dysfunction-Induced Stress Response in Fully Senescent Cells

Bakkenist, Christopher J., Drissi, Rachid, Wu, Jing, Kastan, Michael B., Dome, Jeffrey S.·2004·Cancer Research

Abstract

Replicative senescence is a natural barrier to cellular proliferation that is triggered by telomere erosion and dysfunction. Here, we demonstrate that ATM activation and H2AX-γ nuclear focus formation are sensitive markers of telomere dysfunction in primary human fibroblasts. Whereas the activated form of ATM and H2AX-γ foci were rarely observed in early-passage cells, they were readily detected in late-passage cells. The ectopic expression of telomerase in late-passage cells abrogated ATM activation and H2AX-γ focus formation, suggesting that these stress responses were the consequence of telomere dysfunction. ATM activation was induced in quiescent fibroblasts by inhibition of TRF2 binding to telomeres, indicating that telomere uncapping is sufficient to initiate the telomere signaling response; breakage of chromosomes with telomeric associations is not required for this activation. Although ATM activation and H2AX-γ foci were readily observed in late-passage cells, they disappeared once cells became fully senescent, indicating that constitutive signaling from dysfunctional telomeres is not required for the maintenance of senescence.

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Crossref · 10.1158/0008-5472.can-04-0453

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Authors
Bakkenist, C. J., Drissi, R., Wu, J., Kastan, M. B., & Dome, J. S.
Affiliations
St. Jude Children's Research Hospital (US)
Venue
Cancer Research
Published
2004-06-01
Volume
64
Issue
11
Pages
3748-3752
ISSN
  • 0008-5472 (ISSN-L)
  • 1538-7445
OpenAlex
W2109369265
Cited by
68
References
20
Citations by year
2024: 1 · 2023: 3 · 2022: 1 · 2021: 3 · 2018: 2 · 2017: 2 · 2016: 1 · 2015: 2 · 2014: 3 · 2013: 2 · 2012: 4
FWCI
4.73
Type
journal article
Language
en
Open access
closed
Locations
  • Cancer Research (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • California Institute of Technology
  • National Cancer Institute (CA71387, CA21765, R01CA071387, P30CA021765)
Topics
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
Keywords
telomere dysfunction, replicative senescence, ATM activation, telomerase, TRF2, telomere uncapping, DNA damage response, human fibroblasts
MeSH terms
Cell Nucleus, Cells, Cultured, DNA-Binding Proteins, Fibroblasts, HeLa Cells, Histones, Humans, Microscopy, Fluorescence, Signal Transduction, Tumor Suppressor Protein p53, Telomere, Cellular Senescence, Protein Serine-Threonine Kinases, Cell Cycle Proteins, Tumor Suppressor Proteins, Ataxia Telangiectasia Mutated Proteins

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