title: Evidence for attenuated cellular 8-oxo-7,8-dihydro-2'-deoxyguanosine removal in cancer patients.
abstract: Measurement of the products of oxidatively damaged DNA in urine is a frequently used means by which oxidative stress may be assessed non-invasively. We believe that urinary DNA lesions, in addition to being biomarkers of oxidative stress, can potentially provide more specific information, for example, a reflection of repair activity. We used high-performance liquid chromatography prepurification, with gas chromatography-mass spectrometry (LC-GC-MS) and ELISA to the analysis of a number of oxidative [e.g., 8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxodG), 8-oxo-7,8-dihydro-guanine, 5-(hydroxymethyl)uracil], non-oxidative (cyclobutane thymine dimers) and oligomeric DNA products in urine. We analysed spot urine samples from 20 healthy subjects, and 20 age- and sex-matched cancer patients. Mononuclear cell DNA 8-oxodG levels were assessed by LC-EC. The data support our proposal that urinary DNA lesion products are predominantly derived from DNA repair. Furthermore, analysis of DNA and urinary 8-oxodG in cancer patients and controls suggested reduced repair activity towards this lesion marker in these patients.
authors.affiliation: Department of Cancer Studies and Molecular Medicine, Leicester Royal Infirmary, University Hospitals of Leicester NHS Trust, Leicester, LE2 7LX, UK. msc5@le.ac.uk
authors.forename: Marcus S
authors.initials: MS
authors.lastname: Cooke
authors.forename: Rafal
authors.initials: R
authors.lastname: Rozalski
authors.forename: Rosamund
authors.initials: R
authors.lastname: Dove
authors.forename: Daniel
authors.initials: D
authors.lastname: Gackowski
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Siomek
authors.forename: Mark D
authors.initials: MD
authors.lastname: Evans
authors.forename: Ryszard
authors.initials: R
authors.lastname: Olinski
mesh_terms: D000080242:8-Hydroxy-2'-Deoxyguanosine; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000378:metabolism / Q000652:urine*; D016022:Case-Control Studies; D002851:Chromatography, High Pressure Liquid; D015179:Colorectal Neoplasms / Q000378:metabolism / Q000473:pathology; D004247:DNA / Q000378:metabolism / Q000652:urine; D003849:Deoxyguanosine / Q000031:analogs & derivatives* / Q000378:metabolism / Q000652:urine; D005260:Female; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D007962:Leukocytes / Q000166:cytology / Q000378:metabolism; D008175:Lung Neoplasms / Q000378:metabolism / Q000473:pathology; D008297:Male; D008875:Middle Aged
chemical_list: D014408:Biomarkers, Tumor; D000080242:8-Hydroxy-2'-Deoxyguanosine; D004247:DNA; D003849:Deoxyguanosine