Cited by 61DNA Repair MechanismsSkin Protection and AgingNonmelanoma Skin Cancer Studies

Oxidative damage to RPA limits the nucleotide excision repair capacity of human cells

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Guven, Melisa, Brem, Reto, Macpherson, Peter, Peacock, Matthew, Karran, Peter·2015·Journal of Investigative Dermatology

Abstract

Nucleotide excision repair (NER) protects against sunlight-induced skin cancer. Defective NER is associated with photosensitivity and a high skin cancer incidence. Some clinical treatments that cause photosensitivity can also increase skin cancer risk. Among these, the immunosuppressant azathioprine and the fluoroquinolone antibiotics ciprofloxacin and ofloxacin interact with UVA radiation to generate reactive oxygen species that diminish NER capacity by causing protein damage. The replication protein A (RPA) DNA-binding protein has a pivotal role in DNA metabolism and is an essential component of NER. The relationship between protein oxidation and NER inhibition was investigated in cultured human cells expressing different levels of RPA. We show here that RPA is limiting for NER and that oxidative damage to RPA compromises NER capability. Our findings reveal that cellular RPA is surprisingly vulnerable to oxidation, and we identify oxidized forms of RPA that are associated with impaired NER. The vulnerability of NER to inhibition by oxidation provides a connection between cutaneous photosensitivity, protein damage, and increased skin cancer risk. Our findings emphasize that damage to DNA repair proteins, as well as to DNA itself, is likely to be an important contributor to skin cancer risk.

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Crossref · 10.1038/jid.2015.255

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  • Oxidative stress generated by UVA promotes oxidation of RPA, which debilitates the ability of NER to remove photoproducts from human keratinocytes.

    “the oxidative stress generated by UVA promotes oxidation of RPA, which debilitates the ability of the NER to remove photoproducts from human keratinocytes [263].”
  • UVA radiation can promote the oxidation of proteins involved in DNA repair, which would impair the removal of DNA damage.

    “UVA radiation can promote the oxidation of the proteins that are involved in DNA repair, which would impair the removal of the DNA damage.”

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  1. Peacock M UVA photosensitizers, protein oxidation and DNA repair 2014 University College London PhD Thesis

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Authors
Guven, M., Brem, R., Macpherson, P., Peacock, M., & Karran, P.
Affiliations
The Francis Crick Institute (GB)
Corresponding author
Karran, Peter
Venue
Journal of Investigative Dermatology
Publisher
Elsevier BV
Published
2015-11
Volume
135
Issue
11
Pages
2834-2841
ISSN
0022-202X (ISSN-L)
OpenAlex
W1520446265
Cited by
61
References
31
Citations by year
2025: 3 · 2024: 3 · 2023: 6 · 2022: 3 · 2021: 6 · 2020: 8 · 2019: 7 · 2018: 7 · 2017: 6 · 2016: 10 · 2015: 1
FWCI
3.48
Type
journal article
Language
en
Open access
Locations
  • Journal of Investigative Dermatology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • Figshare (submittedVersion, cc-by)
Funders
Cancer Research UK
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Health Sciences › Medicine › Dermatology › Skin Protection and Aging
  • Health Sciences › Medicine › Epidemiology › Nonmelanoma Skin Cancer Studies
Keywords
nucleotide excision repair, replication protein A, protein oxidation, oxidative damage, skin cancer risk, photosensitivity, reactive oxygen species, azathioprine, fluoroquinolones, UVA, DNA repair proteins
MeSH terms
Cells, Cultured, DNA Damage, DNA Repair, DNA-Binding Proteins, Enzyme-Linked Immunosorbent Assay, Humans, Oxidation-Reduction, Photosensitivity Disorders, Skin Neoplasms, Thioguanine, Ultraviolet Rays, Immunoblotting, Photosensitizing Agents, Oxidative Stress, Replication Protein A

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