Cited by 336Telomeres, Telomerase, and SenescenceCancer-related Molecular PathwaysGenetics, Aging, and Longevity in Model Organisms

p53 isoforms Δ133p53 and p53β are endogenous regulators of replicative cellular senescence

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Fujita, Kaori, Mondal, Abdul M., Horikawa, Izumi, Nguyen, Giang H., Kumamoto, Kensuke, Sohn, Jane J., Bowman, Elise D., Mathe, Ewy A. +7 more·2009·Nature Cell Biology

Abstract

The finite proliferative potential of normal human cells leads to replicative cellular senescence, which is a critical barrier to tumour progression in vivo. We show that the human p53 isoforms Delta133p53 and p53beta function in an endogenous regulatory mechanism for p53-mediated replicative senescence. Induced p53beta and diminished Delta133p53 were associated with replicative senescence, but not oncogene-induced senescence, in normal human fibroblasts. The replicatively senescent fibroblasts also expressed increased levels of miR-34a, a p53-induced microRNA, the antisense inhibition of which delayed the onset of replicative senescence. The siRNA (short interfering RNA)-mediated knockdown of endogenous Delta133p53 induced cellular senescence, which was attributed to the regulation of p21(WAF1) and other p53 transcriptional target genes. In overexpression experiments, whereas p53beta cooperated with full-length p53 to accelerate cellular senescence, Delta133p53 repressed miR-34a expression and extended the cellular replicative lifespan, providing a functional connection of this microRNA to the p53 isoform-mediated regulation of senescence. The senescence-associated signature of p53 isoform expression (that is, elevated p53beta and reduced Delta133p53) was observed in vivo in colon adenomas with senescent phenotypes. The increased Delta133p53 and decreased p53beta isoform expression found in colon carcinoma may signal an escape from the senescence barrier during the progression from adenoma to carcinoma.

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  • Colon adenoma-derived samples have elevated expression of p16INK4a, HP1γ, and focal γH2AX expression, indicating enhanced DNA damage.

    “colon adenoma- derived samples also have elevated expression of p16 INK4a , HP1γ (an H3K9me3- enriched senescence- associated heterochromatin focus- promoting scaffold that connects H3K9 methyltransferases to Rb as another binding partner), and focal γH2AX expression, indicating enhanced DNA damage 87,89 .”

    From Senescence and cancer — role and therapeutic opportunities (2022) · cites this paper as [89]

    The colon-adenoma passage (labeled Abstract; page not provided) reports significantly higher p16INK4A expression in adenomas than in non-adenoma or normal colon tissue. Our copy does not report elevated HP1γ or focal γH2AX expression in those samples, so it does not support the claim of enhanced DNA damage on that basis. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • In cultured normal human fibroblasts, p53β speeds up and Δ133p53 suppresses replicative senescence.

    “In normal human fibroblasts cultured in vitro, p53β accelerates and Δ133p53 represses replicative senescence (15), consistent with their modes of functional interaction with p53FL.”
  • Premalignant colon adenomas with pathologically induced senescent cells show elevated p53β and reduced Δ133p53, and loss of this pattern is linked to malignant progression.

    “Premalignant colon adenomas with pathologically induced senescent cells in vivo also showed a specific profile of p53 isoform expression (i.e., elevated levels of p53β and reduced levels of Δ133p53), the loss of which was associated with malignant progression to colon carcinomas (15).”
  • The regulatory mechanisms for p53 isoform expression may be conserved between CD8+ T lymphocytes and fibroblasts.

    “The regulatory mechanisms for the p53 isoform expression may be conserved in CD8 + T lymphocytes (present study) and fibroblasts (15).”
  • Δ133p53 undergoes autophagic breakdown, whereas p53FL and p53β are broken down by the proteasome.

    “The autophagic degradation of Δ133p53 is in contrast to the proteasome-mediated degradation of p53FL and p53β (15)”

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Authors
Fujita, K., Mondal, A. M., Horikawa, I., Nguyen, G. H., Kumamoto, K., Sohn, J. J., Bowman, E. D., Mathe, E. A., Schetter, A. J., Pine, S. R., Ji, H., Vojtesek, B., Bourdon, J.-C., Lane, D. P., & Harris, C. C.
Affiliations
  • National Institutes of Health (US)
  • Inserm (FR)
Corresponding author
Harris, Curtis C.
Venue
Nature Cell Biology
Published
2009-08-23
Volume
11
Issue
9
Pages
1135-1142
ISSN
  • 1465-7392 (ISSN-L)
  • 1476-4679
OpenAlex
W1524571013
Cited by
336
References
40
Citations by year
2026: 16 · 2025: 21 · 2024: 18 · 2023: 15 · 2022: 23 · 2021: 28 · 2020: 18 · 2019: 17 · 2018: 27 · 2017: 13 · 2016: 18 · 2015: 18 · 2014: 15 · 2013: 15 · 2012: 22
FWCI
16.40
Type
journal article
Language
en
Open access
Locations
  • Nature Cell Biology (publishedVersion)
  • PubMed (publishedVersion)
  • Discovery Research Portal (University of Dundee) (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Cancer Research UK
  • National Institutes of Health
  • Medical Research Council
  • National Cancer Institute (Z01BC010878, ZIABC010878, ZIABC005795, Z01BC005480, Z01BC005795)
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
p53 isoforms, Δ133p53, miR-34a, p21, colonic adenoma, colon cancer, oncogene-induced senescence, senescence escape, carcinogenesis, microRNA regulation
MeSH terms
Colonic Neoplasms, Humans, Mutation, Gene Expression Regulation, Neoplastic, Tumor Suppressor Protein p53, Cellular Senescence, Protein Isoforms, MicroRNAs, Cell Line, Tumor, Gene Knockdown Techniques

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