Cited by 70Carcinogens and Genotoxicity AssessmentDNA Repair MechanismsDNA and Nucleic Acid Chemistry

Quantitative Analysis of DNA Interstrand Cross-Links and Monoadducts Formed in Human Cells Induced by Psoralens and UVA Irradiation

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Lai, Congfang, Cao, Huachuan, Hearst, John E., Corash, Laurence, Luo, Hai, Wang, Yinsheng·2008·Analytical Chemistry

Abstract

Upon exposure to UVA light, psoralens can induce DNA interstrand cross-links (ICLs), which can block DNA replication and transcription. Among the psoralen derivatives, 8-methoxypsoralen (8-MOP) is conventionally applied for psoriasis therapy, and amotosalen S59 is used to inactivate bacterial and viral pathogens in blood components. In addition to the ICL formation, psoralens also readily form various monoadducts (MAs) with thymidine residues in DNA when exposed to UVA light, and the biological implications for these monoadducts remain unclear. Here, we reported a method that encompassed digestion with a single enzyme (nuclease P1) and LC-MS/MS, for the simultaneous quantification of ICL and MAs induced in human cells exposed with 8-MOP or S59 and UVA light. Our results showed that the yield of ICL induced by S59, which increased from 3.9 to 12.8 lesions/10(3) nucleotides as the dose of UVA light increased from 0.5 to 10.0 J/cm(2), was approximately 100 fold more than that induced by 8-MOP. In addition, three and five products were identified as 8-MOP- and S59-MAs, respectively, and the yields of MAs were significantly lower than that for ICL. The yields of the three 8-MOP-MAs were 7.6-2.2, 1.9-9.9, and 7.2-51 per 10(6) nucleotides and those of the five S59-MAs were 215-19, 106-39, 25-21, 32-146, and 22-26 per 10(6) nucleotides as the dose of UVA light increased from 0.5 to 10.0 J/cm(2). Although the yields of MAs induced by 8-MOP and S59 were lower than those of the respective ICLs under the same exposure conditions, the formation of appreciable amounts of MAs might account for some of the mutations induced by psoralens.

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  1. [14]Nussbaumer W Allersdorfer D Grabmer C Rheinschmidt M Lin L Schonitzer D Lass-Florl C Transfusion 2007 47 1125 1133 17581146

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Authors
Lai, C., Cao, H., Hearst, J. E., Corash, L., Luo, H., & Wang, Y.
Affiliations
University of California, Riverside (US)
Corresponding author
  • Luo, Hai
  • Wang, Yinsheng
Venue
Analytical Chemistry
Published
2008-10-24
Volume
80
Issue
22
Pages
8790-8798
ISSN
  • 0003-2700 (ISSN-L)
  • 1520-6882
OpenAlex
W2052260838
Cited by
70
References
26
Citations by year
2026: 1 · 2025: 2 · 2024: 4 · 2023: 1 · 2022: 2 · 2021: 5 · 2020: 3 · 2019: 5 · 2018: 6 · 2017: 3 · 2016: 6 · 2015: 4 · 2014: 6 · 2013: 7 · 2012: 7
FWCI
0.80
Type
journal article
Language
en
Open access
Locations
  • Analytical Chemistry (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • China Scholarship Council
  • National Cancer Institute (R01CA101864)
Topics
  • 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
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
Keywords
interstrand cross-links, psoralen, 8-methoxypsoralen, UVA irradiation, LC-MS/MS quantification, photodynamic DNA damage, psoriasis treatment, mutagenesis
MeSH terms
Animals, Base Sequence, Cattle, Cross-Linking Reagents, DNA, DNA Damage, Humans, Methoxsalen, Oligodeoxyribonucleotides, Furocoumarins, Ultraviolet Rays, Cell Line, Tumor

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