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Analysis of urinary8-oxo-7,8-dihydro-purine-2’-deoxyribonucleosides by LC-MS/MS and improved ELISA

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posted on 2010-06-21, 13:20 authored by Mark D. Evans, Rajinder Singh, Vilas Mistry, Karendeep Sandhu, Peter B. Farmer, Marcus S. Cooke
Non-invasive monitoring of oxidative stress is highly desirable. Urinary 7,8-dihydro- 8-oxo-2’-deoxyguanosine (8-oxodG) is a biologically relevant and convenient analytical target. However, immunoassays can over-estimate levels of urinary 8-oxodG. Measurement of more than one DNA oxidation product in urine would be advantageous in terms of mechanistic information. Urines samples were analysed for 8-oxodG by solid-phase extraction/LC-MS/MS and ELISA. The solid-phase extraction/LC-MS/MS assay was also applied to the analysis of urinary 7,8-dihydro-8-oxo-2’-deoxyadenosine (8-oxodA). Concurring with previous reports, urinary 8- oxodG measured by ELISA was significantly higher than levels measured by LCMS/MS. However, apparent improvement in the specificity of the commercially available Japanese Institute for the Control of Ageing (JaICA) ELISA brought mean LC-MS/MS and ELISA measurements of urinary 8-oxodG into agreement. Urinary 8-oxodA was undetectable in all urines, despite efficient recovery by solid phase extraction. Exploitation of the advantages of ELISA may be enhanced by a simple modification to the assay procedure, although chromatographic techniques still remain the ‘gold standard’ techniques for analysis of urinary 8-oxodG. Urinary 8-oxodA is either not present or below the limit of detection of our instrumentation.



Free Radical Research, 2008, 42 (10), pp. 831-840

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