Cited by 51DNA Repair MechanismsNuclear Structure and FunctionDNA and Nucleic Acid Chemistry

UV sensitivity and impaired nucleotide excision repair in DNA-dependent protein kinase mutant cells

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Muller, C., Calsou, P., Frit, P., Salles, B., Cayrol, C., Carter, T.·1998·Nucleic Acids Research

Abstract

DNA-dependent protein kinase (DNA-PK), a member of the phosphatidyl-inositol (PI)3-kinase family, is involved in the repair of DNA double-strand breaks. Its regulatory subunit, Ku, binds to DNA and recruits the kinase catalytic subunit (DNA-PKcs). We show here a new role of DNA-PK in the modulation of the process of nucleotide excision repair (NER) in vivo since, as compared with their respective parental cell lines, DNA-PK mutants (scid , V-3 and xrs 6 cells) exhibit sensitivity to UV-C irradiation (2.0- to 2.5-fold) and cisplatin ( approximately 3- to 4-fold) associated with a decreased activity (40-55%) of unscheduled DNA synthesis after UV-C irradiation. Moreover, we observed that wortmannin sensitized parental cells in vivo when combined with either cisplatin or UV-C light, but had no effect on the DNA-PKcs deficient scid cells. Despite a lower repair synthesis activity (approximately 2-fold) measured in vitro with nuclear cell extracts from DNA-PK mutants, a direct involvement of DNA-PK in the NER reaction in vitro has not been observed. This study establishes a regulatory function of DNA-PK in the NER process in vivo but rules out a physical role of the complex in the repair machinery at the site of the DNA lesion.

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Authors
Muller, C., Calsou, P., Frit, P., Salles, B., Cayrol, C., & Carter, T.
Affiliations
  • Centre National de la Recherche Scientifique (FR)
  • Hôpital Rangueil (FR)
  • St. John's University (US)
Venue
Nucleic Acids Research
Published
1998-03-01
Volume
26
Issue
6
Pages
1382-1389
ISSN
  • 0305-1048 (ISSN-L)
  • 1362-4962
OpenAlex
W2039635928
Cited by
51
References
60
Citations by year
2023: 1 · 2021: 1 · 2020: 2 · 2016: 1 · 2015: 1 · 2014: 2 · 2012: 3
FWCI
1.98
Type
journal article
Language
en
Open access
Locations
  • Nucleic Acids Research (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Association pour la Recherche sur le Cancer
  • Fondation de France
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nuclear Structure and Function
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
Keywords
DNA-dependent protein kinase, nucleotide excision repair, UV sensitivity, cisplatin sensitivity, Ku protein, DNA-PKcs, wortmannin, unscheduled DNA synthesis, PI3-kinase, DNA double-strand break repair, UV-C irradiation
MeSH terms
Wortmannin, Phosphoinositide-3 Kinase Inhibitors, Androstadienes, Animals, Bleomycin, Cell Line, Cell Survival, Cisplatin, DNA Repair, DNA-Binding Proteins, Enzyme Inhibitors, Cricetinae, HeLa Cells, Humans, Nuclear Proteins, Radiation Tolerance, Radiation-Sensitizing Agents, Ultraviolet Rays, CHO Cells, Mice, SCID, Protein Serine-Threonine Kinases, Mice, DNA-Activated Protein Kinase

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