Endogenous Oxidative Damage of Deoxycytidine in DNA

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1992 Apr 15

PMID 1565630

Citations 50

Authors

J R Wagner

C C Hu

B N Ames

Affiliations

Soon will be listed here.

Abstract

Three major oxidation products of 2'-deoxycytidine (dC)--5-hydroxy-2'-deoxycytidine (oh5dC), 5-hydroxy-2'-deoxyuridine (oh5dU), and 5,6-dihydroxy-5,6-dihydro-2'-deoxyuridine (dUg)--were analyzed from enzymatically hydrolyzed DNA with reversed-phase high-performance liquid chromatography coupled to electrochemical detection. oh5dC and oh5dU can be detected with high sensitivity (50 fmol) and selectivity (0-0.2 V) from hydrolyzed DNA. dUg is not electrochemically active but can be measured by dehydrating it into oh5dU. The quantities of oh5dC, dUg, and oh5dU in untreated commercial-grade calf thymus DNA are 10, 10, and 0.75 fmol/micrograms of DNA, respectively. These levels increased substantially when calf thymus DNA was exposed to ionizing radiation, H2O2 alone, H2O2 and combinations of Fe3+ or Cu2+ and ascorbate, near-UV light (365 nm), near-UV light in the presence of menadione, and OsO4, indicating that oh5dC, oh5dU, and dUg are major oxidative DNA damage products. The steady-state levels of these products were determined from freshly extracted rat tissues and ranged from less than 0.5 fmol/micrograms of DNA for oh5dU to about 10 fmol/micrograms of DNA for oh5dC and dUg in liver and kidney and 22 fmol/micrograms of DNA for oh5dC in brain. The levels of oxo8dG were also determined and in general were somewhat lower than the levels of oh5dC. These findings reinforce the link between DNA damage induced by oxidative metabolism and spontaneous mutagenesis leading to cancer and aging.

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