Role of antioxidants in prevention of pyrimidine dimer formation in UVB irradiated human HaCaT keratinocytes

Malka Hochberg, Ron Kohen*, Claes D. Enk

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


The objective of the present study was to study the role of reactive oxygen species (ROS) in UVB induced cyclobutane pyrimidine dimer (CPD) formation in human keratinocytes, and to examine the modulating activity of low molecular weight antioxidants. To demonstrate the involvement of ROS, we examined the protective capacity of α-tocopherol, tempamine, and diethyldithiocarbamate (DDC) on CPD formation in intact cells and naked DNA. HaCaT cells and naked DNA in water solution were irradiated with UVB in the presence of the antioxidants and CPD was determined by ELISA. We found that all three antioxidants provided protection against UVB induced CPD formation. The protection was observed in intact cells only and not in naked DNA. Since some of the tested antioxidants do not possess UV absorbing qualities, our findings suggest that in a cellular environment ROS play a role in CPD formation.

Original languageAmerican English
Pages (from-to)233-237
Number of pages5
JournalBiomedicine and Pharmacotherapy
Issue number5
StatePublished - Jun 2006

Bibliographical note

Funding Information:
Supported by grants from The Israel Cancer Association through the donation from The Brown Foundation, Florida, (grant no. 20030004-B), The Dead Sea Research Center, Israel, grant no. 422(6)-2-M) and The Eva and Henry Fraenkel Memorial Foundation, Copenhagen, Denmark.


  • Antioxidants
  • HaCaT keratinocytes
  • Pyrinidine dimers
  • UVB
  • α-Tocopherol


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