Repair of Products of Oxidative DNA Base Damage in Human Cells

Overview

Journal Nucleic Acids Res

Publisher Oxford University Press

Specialty Biochemistry

Date 1996 Apr 15

PMID 8628669

Citations 59

Authors

P Jaruga

M Dizdaroglu

Affiliations

Soon will be listed here.

Abstract

Oxidative DNA damage is the most frequent type of damage encountered by aerobic cells and may play an important role in biological processes such as mutagenesis, carcinogenesis and aging in humans. Oxidative damage generates a myriad of modifications in DNA. We investigated the cellular repair of DNA base damage products in DNA of cultured human lymphoblast cells, which were exposed to oxidative stress by H2O2. This DNA-damaging agent is known to cause base modifications in genomic DNA of mammalian cells [Dizdaroglu, M., Nackerdien, Z., Chao, B.-C., Gajewski, E. and Rao, G. (1991) Arch. Biochem. Biophys. 285, 388-390]. Following treatment with H2O2, the culture medium was freed from H2O2 and cells were incubated for time periods ranging from 10 min to 6 h. DNA was isolated from control cells, hydrogen peroxide-treated cells and cells incubated after H2O2 exposure. DNA samples were analyzed by gas chromatography/isotope-dilution mass spectrometry. Eleven modified bases were identified and quantified. The results showed a significant formation of these DNA base products upon H2O2-treatment of cells. Subsequent incubation of cells caused a time-dependent excision of these products from cellular DNA. The cell viability did not change significantly by various treatments. There were distinct differences between the kinetics of excision of individual products. The observed excisions were attributed to DNA repair in cells. The rate of repair of purine lesions was slower than that of pyrimidine lesions. Most of the identified products are known to possess various premutagenic properties. The results of this work may contribute to the understanding of the cellular repair of oxidative DNA damage in human and other mammalian cells.

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