Cited by 32DNA Repair MechanismsCarcinogens and Genotoxicity AssessmentEffects of Radiation Exposure

Immunoprecipitation of Pyrimidine(6-4)pyrimidone Photoproducts and Cyclobutane Pyrimidine Dimers in uv-Irradiated DNA

Mitchell, David L., Allison, James P., Nairn, Rodney S.·1990·Radiation Research

Abstract

Biological studies suggest that a significant proportion of the cytotoxicity observed in mammalian cells after uv irradiation may be due to damage other than cyclobutane dimers in DNA. Although pyrimidine-pyrimidone (6-4) photoproducts have been implicated as major contributors to cell lethality, their induction has been measured at considerably less than cyclobutane pyrimidine dimers when measured by chromatographic techniques. Because the yield of (6-4) photoproducts may be reduced by their lability to extreme heat and pH, we have advised an alternative, immunological quantification which does not require DNA hydrolysis. Affinity-purified rabbit antisera were used to precipitate low molecular weight 32P-labeled PM2 DNA irradiated with increasing fluences of uv light. DNA of known molecular weight was used to determine rates of induction for antibody-binding sites associated with (6-4) photoproducts and cyclobutane dimers. These rates were calculated to be 0.6 (6-4) photoproducts and 1.2 cyclobutane dimers/10(8) Da/J/m2. At low uv fluences (6-4) photoproducts were induced at one-half the rate of cyclobutane dimers, whereas at higher fluences (6-4) photoproducts predominated.

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Crossref · 10.2307/3577736

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Authors
Mitchell, D. L., Allison, J. P., & Nairn, R. S.
Affiliations
The University of Texas MD Anderson Cancer Center (US)
Venue
Radiation Research
Publisher
JSTOR
Published
1990-09
Volume
123
Issue
3
Pages
299
ISSN
0033-7587 (ISSN-L)
OpenAlex
W2057906697
Cited by
32
References
7
Citations by year
2024: 1 · 2021: 1 · 2020: 1 · 2018: 1 · 2017: 1 · 2016: 2 · 2015: 1 · 2014: 1 · 2012: 1
FWCI
1.00
Type
journal article
Language
en
Open access
closed
Locations
  • Radiation Research (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Cancer Institute (CA36361)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Carcinogens and Genotoxicity Assessment
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Effects of Radiation Exposure
Keywords
cyclobutane pyrimidine dimers, UV irradiation, DNA damage, immunoprecipitation, antibody binding, cytotoxicity, DNA repair
MeSH terms
Animals, DNA, DNA Damage, Precipitin Tests, Pyrimidine Dimers, Rabbits, Ultraviolet Rays

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