Cited by 138Telomeres, Telomerase, and SenescenceGenomics and Chromatin DynamicsEpigenetics and DNA Methylation

Histone Modifications in Senescence-Associated Resistance to Apoptosis by Oxidative Stress

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Sanders, Yan Y., Liu, Hui, Zhang, Xiangyu, Hecker, Louise, Bernard, Karen, Desai, Leena, Liu, Gang, Thannickal, Victor J.·2013·Redox Biology

Abstract

Aging and age-related diseases are associated with cellular senescence that results in variable apoptosis susceptibility to oxidative stress. Although fibroblast senescence has been associated with apoptosis resistance, mechanisms for this have not been well defined. In this report, we studied epigenetic mechanisms involving histone modifications that confer apoptosis resistance to senescent human diploid fibroblasts (HDFs). HDFs that undergo replicative senescence display typical morphological features, express senescence-associated β-galactosidase, and increased levels of the tumor suppressor genes, p16, p21, and caveolin-1. Senescent HDFs are more resistant to oxidative stress (exogenous H2O2)-induced apoptosis in comparison to non-senescent (control) HDFs; this is associated with constitutively high levels of the anti-apoptotic gene, Bcl-2, and low expression of the pro-apoptotic gene, Bax. Cellular senescence is characterized by global increases in H4K20 trimethylation and decreases in H4K16 acetylation in association with increased activity of Suv420h2 histone methyltransferase (which targets H4K20), decreased activity of the histone acetyltransferase, Mof (which targets H4K16), as well as decreased total histone acetyltransferase activity. In contrast to Bax gene, chromatin immunoprecipitation studies demonstrate marked enrichment of the Bcl-2 gene with H4K16Ac, and depletion with H4K20Me3, predicting active transcription of this gene in senescent HDFs. These data indicate that both global and locus-specific histone modifications of chromatin regulate altered Bcl-2:Bax gene expression in senescent fibroblasts, contributing to its apoptosis-resistant phenotype.

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Authors
Sanders, Y. Y., Liu, H., Zhang, X., Hecker, L., Bernard, K., Desai, L., Liu, G., & Thannickal, V. J.
Affiliations
University of Alabama at Birmingham (US)
Corresponding author
Sanders, Yan Y.
Venue
Redox Biology
Publisher
Elsevier BV
Published
2013
Volume
1
Issue
1
Pages
8-16
ISSN
2213-2317 (ISSN-L)
OpenAlex
W1999206742
Cited by
138
References
53
Citations by year
2026: 4 · 2025: 10 · 2024: 11 · 2023: 17 · 2022: 11 · 2021: 14 · 2020: 17 · 2019: 4 · 2018: 9 · 2017: 11 · 2016: 6 · 2015: 9 · 2014: 13 · 2013: 2
FWCI
6.94
Type
journal article
Language
en
Open access
Locations
  • Redox Biology (publishedVersion, cc-by-nc-nd)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • American Heart Association (09SDG2260095)
  • Coalition for Pulmonary Fibrosis
  • Pulmonary Fibrosis Foundation
  • National Institutes of Health
  • National Heart, Lung, and Blood Institute (R01HL067967, T32HL105346)
Topics
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
Keywords
cellular senescence, replicative senescence, apoptosis resistance, oxidative stress, histone modifications, H4K20 trimethylation, H4K16 acetylation, Bcl-2, Bax, human diploid fibroblasts, epigenetic regulation
MeSH terms
Cells, Cultured, Fibroblasts, Gene Expression Regulation, Histones, Humans, Hydrogen Peroxide, Cellular Senescence, Apoptosis, Oxidative Stress, Proto-Oncogene Proteins c-bcl-2, Epigenesis, Genetic, bcl-2-Associated X Protein

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