Cited by 118Telomeres, Telomerase, and SenescenceEffects of Radiation ExposureGenetics, Aging, and Longevity in Model Organisms

Radiation-induced astrocyte senescence is rescued by Δ133p53

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Turnquist, Casmir, Beck, Jessica A, Horikawa, Izumi, Obiorah, Ifeyinwa E, Von Muhlinen, Natalia, Vojtesek, Borivoj, Lane, David P, Grunseich, Christopher +5 more·2019·Neuro-Oncology

Abstract

BACKGROUND: Cellular senescence and the senescence-associated secretory phenotype (SASP) may contribute to the development of radiation therapy-associated side effects in the lung and blood vessels by promoting chronic inflammation. In the brain, inflammation contributes to the development of neurologic disease, including Alzheimer's disease. In this study, we investigated the roles of cellular senescence and Δ133p53, an inhibitory isoform of p53, in radiation-induced brain injury. METHODS: Senescent cell types in irradiated human brain were identified with immunohistochemical labeling of senescence-associated proteins p16INK4A and heterochromatin protein Hp1γ in 13 patient cases, including 7 irradiated samples. To investigate the impact of radiation on astrocytes specifically, primary human astrocytes were irradiated and examined for expression of Δ133p53 and induction of SASP. Lentiviral expression of ∆133p53 was performed to investigate its role in regulating radiation-induced cellular senescence and astrocyte-mediated neuroinflammation. RESULTS: Astrocytes expressing p16INK4A and Hp1γ were identified in all irradiated tissues, were increased in number in irradiated compared with untreated cancer patient tissues, and had higher labeling intensity in irradiated tissues compared with age-matched controls. Human astrocytes irradiated in vitro also experience induction of cellular senescence, have diminished Δ133p53, and adopt a neurotoxic phenotype as demonstrated by increased senescence-associated beta-galactosidase activity, p16INK4A, and interleukin (IL)-6. In human astrocytes, Δ133p53 inhibits radiation-induced senescence, promotes DNA double-strand break repair, and prevents astrocyte-mediated neuroinflammation and neurotoxicity. CONCLUSIONS: Restoring expression of the endogenous p53 isoform, ∆133p53, protects astrocytes from radiation-induced senescence, promotes DNA repair, and inhibits astrocyte-mediated neuroinflammation.

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Crossref · 10.1093/neuonc/noz001

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  • Primary human astrocytes exposed to X-rays exhibit increased expression of senescence-associated proteins (p16INK4a and Hp1γ) and cytokines associated with SASP, such as IL-1β and IL-6.

    “Furthermore, primary human astrocytes exposed to X-rays exhibit increased expression of senescence-associated proteins (p16INK4a and Hp1γ) and cytokines associated with SASP, such as IL-1β and IL-6.294–296”

    From Inflammation and aging: signaling pathways and intervention therapies (2023) · cites this paper as [296]

    The Methods (page unavailable) identify primary human astrocytes irradiated with an X-ray irradiator. The Results (page unavailable) report increased p16INK4A, IL-1β, and IL-6 in irradiated astrocytes in vitro. Increased Hp1γ was observed in astrocytes in irradiated patient tissue, but the copy does not report that increase in the primary astrocytes irradiated in vitro. (LLM, conf=0.87)

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  1. [28]28. Kuilman T, Michaloglou C, Mooi WJ, Peeper DS. The essence of senescence. Genes Dev. 2010;24(22):2463–2479. [DOI] [PMC free article] [PubMed] [Google Scholar]

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Authors
Turnquist, C., Beck, J. A., Horikawa, I., Obiorah, I. E., Von Muhlinen, N., Vojtesek, B., Lane, D. P., Grunseich, C., Chahine, J. J., Ames, H. M., Smart, D. D., Harris, B. T., & Harris, C. C.
Affiliations
  • National Institutes of Health (US)
  • Georgetown University Medical Center (US)
  • Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, USA
  • Regional Centre for Applied Molecular Oncology, Masaryk Memorial Cancer Institute, Brno, Czech Republic
  • Agency for Science, Technology and Research (SG)
  • University of Maryland, Baltimore (US)
Corresponding author
  • Harris, Brent T
  • Harris, Curtis C
Venue
Neuro-Oncology
Published
2019-01-04
Volume
21
Issue
4
Pages
474-485
ISSN
  • 1522-8517 (ISSN-L)
  • 1523-5866
OpenAlex
W2906978840
Cited by
118
References
56
Citations by year
2026: 9 · 2025: 17 · 2024: 23 · 2023: 17 · 2022: 12 · 2021: 19 · 2020: 19 · 2019: 2
FWCI
8.92
Type
journal article
Language
en
Open access
Locations
  • Neuro-Oncology (publishedVersion, public-domain)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Regional development fund
  • Czech Science Foundation (P206/12/G151)
Topics
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Effects of Radiation Exposure
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
Keywords
radiation-induced senescence, astrocytes, Δ133p53, p53 isoforms, senescence-associated secretory phenotype, neuroinflammation, radiation-induced brain injury, p16INK4a, DNA double-strand break repair, interleukin-6, neurotoxicity, radiotherapy complications
MeSH terms
Astrocytes, Brain Neoplasms, Cells, Cultured, Humans, Radiation Injuries, Tumor Suppressor Protein p53, Cranial Irradiation, Cellular Senescence, Protein Isoforms

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