Cited by 311Skin Protection and AgingCarcinogens and Genotoxicity AssessmentDNA Repair Mechanisms

Wavelength dependence of pyrimidine dimer formation in DNA of human skin irradiated in situ with ultraviolet light.

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Freeman, S E, Hacham, H, Gange, R W, Maytum, D J, Sutherland, J C, Sutherland, B M·1989·Proceedings of the National Academy of Sciences

Abstract

The UV components of sunlight are believed to be a major cause of human skin cancer, and DNA is thought to be the principal molecular target. Alterations of the intensity and wavelength distribution of solar UV radiation reaching the surface of the earth, for example by depletion of stratospheric ozone, will change the effectiveness of solar radiation in damaging DNA in human skin. Evaluation of the magnitude of such effects requires knowledge of the altered sunlight spectrum and of the action spectrum for damaging DNA in human skin. We have determined an action spectrum for the frequency of pyrimidine dimer formation induced in the DNA of human skin per unit dose of UV incident on the skin surface. The peak of this action spectrum is near 300 nm and decreases rapidly at both longer and shorter wavelengths. The decrease in our action spectrum for wavelengths less than 300 nm is attributed to the absorption of the upper layers of the skin, an in situ effect that is inherently included in our measurements. Convolution of the dimer action spectrum with the solar spectra corresponding to a solar angle of 40 degrees under current levels of stratospheric ozone (0.32-cm O3 layer) and those for 50% ozone depletion (0.16-cm O3 layer), indicate about a 2.5-fold increase in dimer formation. If the action spectrum for DNA damage that results in skin cancer resembles that for dimer induction in skin, our results, combined with epidemiological data, suggest that a 50% decrease in stratospheric ozone would increase the incidence of nonmelanoma skin cancers among white males in Seattle, Washington, by 7.5- to 8-fold, to a higher incidence than is presently seen in the corresponding population of Albuquerque, New Mexico.

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Crossref · 10.1073/pnas.86.14.5605

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  • 8-oxoGua is generated in significant yields upon UVA exposure of cultured cells and skin.

    “A much more common biomarker of oxidatively generated damage to DNA is 8-oxoGua that has been found to be generated in significant yields upon exposure of cultured cells (85,112,113) and skin (61) to UVA radiation.”

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Authors
Freeman, S. E., Hacham, H., Gange, R. W., Maytum, D. J., Sutherland, J. C., & Sutherland, B. M.
Affiliations
Brookhaven National Laboratory (US)
Venue
Proceedings of the National Academy of Sciences
Published
1989-07
Volume
86
Issue
14
Pages
5605-5609
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2014444464
Cited by
311
References
22
Citations by year
2026: 3 · 2025: 2 · 2024: 1 · 2023: 1 · 2021: 6 · 2020: 7 · 2019: 5 · 2018: 11 · 2017: 12 · 2016: 11 · 2015: 7 · 2014: 12 · 2013: 12 · 2012: 11
FWCI
6.70
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Cancer Institute (CA-23096)
  • National Institute of General Medical Sciences (GM-40936)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (AR 35296)
Topics
  • Health Sciences › Medicine › Dermatology › Skin Protection and Aging
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Carcinogens and Genotoxicity Assessment
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
Keywords
ultraviolet radiation, action spectrum, wavelength dependence, stratospheric ozone depletion, non-melanoma skin cancer, skin cancer incidence, UV-induced DNA damage
MeSH terms
Adult, DNA, Erythema, Humans, Pyrimidine Dimers, Skin, Ultraviolet Rays

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