Cited by 239Telomeres, Telomerase, and SenescenceCancer-related Molecular PathwaysGenetics, Aging, and Longevity in Model Organisms

Significant Role for p16INK4a in p53-Independent Telomere-Directed Senescence

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Jacobs, Jacqueline J.L., de Lange, Titia·2004·Current Biology

Abstract

Telomere attrition in primary human fibroblasts induces replicative senescence accompanied by activation of the p53 and p16(INK4a)/RB tumor suppressor pathways. Although the contribution of p53 and its target, p21, to telomere-driven senescence have been well established, the role of p16(INK4a) is controversial. Attempts to dissect the significance of p16(INK4a) in response to telomere shortening have been hampered by the concomitant induction of p16(INK4a) by cell culture conditions. To circumvent this problem, we studied the role of p16(INK4a) in the cellular response to acute telomere damage induced by a dominant negative allele of TRF2, TRF2(Delta B Delta M). This approach avoids the confounding aspects of culture stress because parallel cultures with and without telomere damage can be compared. Telomere damage generated with TRF2(Delta B Delta M) resulted in induction of p16(INK4a) in the majority of cells as detected by immunohistochemistry. Inhibition of p16(INK4a) with shRNA or overexpression of BMI1 had a significant effect on the telomere damage response in p53-deficient cells. While p53 deficiency alone only partially abrogated the telomere damage-induced cell cycle arrest, combined inhibition of p16(INK4a) and p53 led to nearly complete bypass of telomere-directed senescence. We conclude that p16(INK4a) contributes to the p53-independent response to telomere damage.

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Crossref · 10.1016/j.cub.2004.12.025

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Authors
Jacobs, J. J. L., & de Lange, T.
Affiliations
Rockefeller University (US)
Venue
Current Biology
Publisher
Elsevier BV
Published
2004-12
Volume
14
Issue
24
Pages
2302-2308
ISSN
0960-9822 (ISSN-L)
OpenAlex
W2081944825
Cited by
237
References
46
Citations by year
2026: 8 · 2025: 6 · 2024: 7 · 2023: 9 · 2022: 12 · 2021: 11 · 2020: 9 · 2019: 5 · 2018: 14 · 2017: 9 · 2016: 10 · 2015: 14 · 2014: 7 · 2013: 9 · 2012: 16
FWCI
8.43
Type
journal article
Language
en
Open access
Locations
  • Current Biology (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute on Aging (AG16642)
Topics
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
Keywords
p16INK4a, p53-independent senescence, telomere damage, replicative senescence, telomere shortening, p53 deficiency, BMI1, cell cycle arrest, p21, tumor suppressor pathways, shRNA knockdown
MeSH terms
Bromodeoxyuridine, Cells, Cultured, DNA Damage, Fibroblasts, Fluorescent Antibody Technique, Humans, Immunohistochemistry, Tumor Suppressor Protein p53, Telomere, Cellular Senescence, Cyclin-Dependent Kinase Inhibitor p16, Telomeric Repeat Binding Protein 2

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