title: Impairment of antioxidant enzymes, lipid peroxidation and 8-oxo-2'-deoxyguanosine in advanced epithelial ovarian carcinoma of a Spanish community.
abstract: In the present study, we describe the changes of antioxidant enzyme activities and other oxidative stress-related parameters in a mediterranean cohort of women affected with epithelial ovarian carcinoma (EOC). For that purpose, the most representative enzymatic activities, such as superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPx) and the oxidized/reduced glutathione (GSSG/GSH) ratio have been analyzed in tumor tissue biopsies and compared with the normal tissue of the same patient. As oxidation products, the levels of malondialdehyde (MDA) as an indication of lipid peroxidation, and the DNA damaged base 8-oxo-2'-deoxyguanosine (8-oxo-dG) have been also measured. Advanced EOC show reduced levels of SOD and CAT, while that of GPx is increased when compared with non-neoplastic tissue. The levels of GSH are increased giving as a result a reduction of the oxidative stress marker GSSG/GSH ratio comparing normal ovarian tissue with tumor tissue. In addition, the oxidation products MDA and 8-oxo-dG are significantly increased in tumor tissue, suggesting a shift of oxidative metabolisms towards a pro-oxidation state and potential gene instability in malignant ovary cells. The possible implication of the redox changes and DNA damage in tumor development is discussed.
authors.affiliation: Department of Pediatry, Obstetrics and Gynecology, Faculty of Medicine, University of Valencia, Valencia, Spain.
authors.forename: Maria
authors.initials: M
authors.lastname: Sanchez
authors.forename: José Vicente
authors.initials: JV
authors.lastname: Torres
authors.forename: Carmen
authors.initials: C
authors.lastname: Tormos
authors.forename: Antonio
authors.initials: A
authors.lastname: Iradi
authors.forename: Pilar
authors.initials: P
authors.lastname: Muñiz
authors.forename: Olga
authors.initials: O
authors.lastname: Espinosa
authors.forename: Amparo
authors.initials: A
authors.lastname: Salvador
authors.forename: Juana
authors.initials: J
authors.lastname: Rodriguez-Delgado
authors.forename: Marta
authors.initials: M
authors.lastname: Fandos
authors.forename: Guillermo T
authors.initials: GT
authors.lastname: Sáez
mesh_terms: D000080242:8-Hydroxy-2'-Deoxyguanosine; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002374:Catalase / Q000378:metabolism; D004249:DNA Damage; D003849:Deoxyguanosine / Q000031:analogs & derivatives / Q000032:analysis; D005260:Female; D005978:Glutathione / Q000032:analysis; D005979:Glutathione Peroxidase / Q000378:metabolism; D006801:Humans; D015227:Lipid Peroxidation; D008875:Middle Aged; D009367:Neoplasm Staging; D009375:Neoplasms, Glandular and Epithelial / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D010051:Ovarian Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D000080242:8-Hydroxy-2'-Deoxyguanosine; D002374:Catalase; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D003849:Deoxyguanosine; D005978:Glutathione