title: Lipid peroxidation and antioxidant system in the blood of cancerous patients with metastasis.
abstract: Free-radical-mediated damages may play an important role during metastasis. To investigate their relevance in the metastatic process MDA levels, glutathione peroxidase (GPX) and superoxide dismutase (SOD) activities, and selenium, zinc and copper contents were determined in plasma and erythrocytes from 20 cancerous patients with metastasis and 30 age-matched controls. Significantly higher concentrations of MDA in plasma as well as in erythrocytes were found comparing to the control group. In both plasma and erythrocytes, GPX activity and selenium and zinc levels were significantly lower in patients than in controls. However, SOD activity in erythrocytes and copper levels in both plasma and erythrocytes were significantly higher in patients. The impaired antioxidant system may favor accumulation of free radicals which may induce the process of metastasis. On the other hand, it is possible that the antioxidant system is impaired as a consequence of abnormality in the antioxidative metabolisms due to the cancer process.
authors.affiliation: Department of Medical Biology, Cerrahpasa Medical Faculty, Istanbul University, Turkey.
authors.forename: M
authors.initials: M
authors.lastname: Guven
authors.forename: B
authors.initials: B
authors.lastname: Ozturk
authors.forename: A
authors.initials: A
authors.lastname: Sayal
authors.forename: A
authors.initials: A
authors.lastname: Ozeturk
authors.forename: T
authors.initials: T
authors.lastname: Ulutin
mesh_terms: D000328:Adult; D000368:Aged; D000975:Antioxidants / Q000032:analysis*; D003300:Copper / Q000097:blood*; D004912:Erythrocytes / Q000201:enzymology; D005609:Free Radicals; D005979:Glutathione Peroxidase / Q000097:blood*; D006801:Humans; D015227:Lipid Peroxidation; D008297:Male; D008315:Malondialdehyde / Q000097:blood*; D008875:Middle Aged; D009362:Neoplasm Metastasis; D009363:Neoplasm Proteins / Q000097:blood*; D018384:Oxidative Stress; D012643:Selenium / Q000097:blood*; D013482:Superoxide Dismutase / Q000097:blood*; D015032:Zinc / Q000097:blood*
chemical_list: D000975:Antioxidants; D005609:Free Radicals; D009363:Neoplasm Proteins; D008315:Malondialdehyde; D003300:Copper; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D012643:Selenium; D015032:Zinc