Cited by 30Cancer-related Molecular PathwaysDNA Repair MechanismsCell death mechanisms and regulation

p53 is dispensable for UV-induced cell cycle arrest at late G1 in mammalian cells

Al-Mohanna, Mai A., Al-Khodairy, Fahad M., Krezolek, Zbigniew, Bertilsson, Per-Anders, Al-Houssein, Khalid A., Aboussekhra, Abdelilah·2001·Carcinogenesis

Abstract

Genotoxic agents, including gamma-rays and UV light, induce transient arrest at different phases of the cell cycle. These arrests are required for efficient repair of DNA lesions, and employ several factors, including the product of the tumor suppressor gene p53 that plays a central role in the cellular response to DNA damage. p53 protein has a major function in the gamma-ray-induced cell cycle delay in G(1) phase. However, it remains uncertain as to whether p53 is also involved in the UV-mediated G(1) delay. This report provides evidence that p53 is not involved in UV-induced cellular growth arrest in late G(1) phase. This has been demonstrated in HeLa cells synchronized at the G(1)/S border by aphidicolin, followed by UV exposure. Interestingly, the length of this p53-independent G(1) arrest has been shown to be UV dose-dependent. Similar results were also obtained with other p53-deficient cell lines, including human promyelocytic leukemia HL-60 and mouse p53 knock-out cells. As expected, all of these cell lines were defective in gamma-ray-induced cell growth arrest at late G(1). Moreover, it is shown that in addition to cell cycle arrest, HL-60 cells undergo apoptosis in G(1) phase in response to UV light but not to gamma-rays. Together, these findings indicate that p53- compromised cells have a differential response following exposure to ionizing radiation or UV light.

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Crossref · 10.1093/carcin/22.4.573

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Authors
Al-Mohanna, M. A., Al-Khodairy, F. M., Krezolek, Z., Bertilsson, P.-A., Al-Houssein, K. A., & Aboussekhra, A.
Corresponding author
Aboussekhra, Abdelilah
Venue
Carcinogenesis
Published
2001-04
Volume
22
Issue
4
Pages
573-578
ISSN
  • 0143-3334 (ISSN-L)
  • 1460-2180
OpenAlex
W2149316054
Cited by
30
References
42
Citations by year
2024: 1 · 2022: 1 · 2021: 1 · 2019: 1 · 2017: 2 · 2016: 1 · 2015: 1 · 2014: 1 · 2013: 1 · 2012: 1
FWCI
0.59
Type
journal article
Language
en
Open access
closed
Locations
  • Carcinogenesis (publishedVersion)
  • PubMed (publishedVersion)
Funders
King Faisal Specialist Hospital and Research Centre
Topics
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
Keywords
p53, DNA damage response, p53-deficient cells, HL-60 cells, HeLa cells, UV-induced apoptosis, ionizing radiation response, UV dose dependence
MeSH terms
Animals, Cell Cycle, Cell Line, Dose-Response Relationship, Radiation, Flow Cytometry, Gamma Rays, HeLa Cells, Humans, Light, Time Factors, Ultraviolet Rays, Tumor Suppressor Protein p53, G1 Phase, Apoptosis, Mice, Knockout, HL-60 Cells, Mice, DNA Fragmentation

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