Abstract
We are attempting to resolve some of the problems encountered in measuring 8-hydroxy-2'-deoxyguanosine (8-oxodG) in human cellular DNA as a marker of oxidative stress. Samples of authentic 8-oxodG were distributed, and participating laboratories undertook to analyse this material within a specified period. Most HPLC procedures gave values for 8-oxodG within ±40% of the target, as did two of four GC-MS procedures, and both LC-MS-MS methods. Calf thymus DNA samples containing increasing amounts of 8-oxodG were also distributed for analysis. Fewer than half the procedures tested were able to detect the dose response; those that were successful tended to be procedures with low coefficients of variation. For the analysis of 8-oxodG in human cells, where it is likely to be present at much lower concentrations than in the calf thymus DNA, it is crucial to reduce analytical variation to a minimum; a coefficient of variation of less than 10% should be the aim, to give reasonable precision. HPLC with amperometric electrochemical detection is not recommended, as it is less sensitive than coulometric detection. Immunological detection, 32P-postlabelling and LC-MS-MS are alternative approaches to measurement of 8-oxodG in DNA that, on the grounds of precision and detection of dose response, cannot at present be recommended.
Original language | English (US) |
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Pages (from-to) | 333-341 |
Number of pages | 9 |
Journal | Free Radical Research |
Volume | 32 |
Issue number | 4 |
DOIs | |
State | Published - 2000 |
Bibliographical note
Funding Information:We are grateful to the Scottish Executive Rural Affairs Department and the UK Ministry of Agriculture, Fisheries and Food for financial support and thank Hoffmann-La Roche for Ro 19-8022. We thank Susan J. Duthie for helpful comments on the manuscript.
Keywords
- 8-hydroxy-2'-deoxyguanosine
- GC-MS
- HPLC
- Methods validation
- Oxidative DNA damage