title: Antioxidative metabolism in Down syndrome.
abstract: Down syndrome is the most common cause of mental retardation, affecting 1 in 700-800 liveborn infants. Although numerous biochemical abnormalities accompanying the syndrome have not yet been completely clarified, the antioxidant defense system enzymes have shown to be altered due to increased gene dosage on chromosome 21 and overproduction of superoxide dismutase (SOD-1 or Cu/Zn SOD). The purpose of this study was to investigate the activities of SOD-1 and glutathione peroxidase (GSH-Px) enzymes and the levels of their cofactors zinc (Zn), copper (Cu) and selenium (Se) in plasma of 20 Down syndrome patients. In comparison with age and sex-matched controls (n = 15), plasma GSH-Px, SOD, and Cu levels were significantly decreased in the patient group, but Zn and Se concentrations remained unchanged.
authors.affiliation: Ankara University, Faculty of Medicine, Gynecology and Obstetrics Department, Cebeci, Türkiye.
authors.forename: F
authors.initials: F
authors.lastname: Tekşen
authors.forename: B S
authors.initials: BS
authors.lastname: Sayli
authors.forename: A
authors.initials: A
authors.lastname: Aydin
authors.forename: A
authors.initials: A
authors.lastname: Sayal
authors.forename: A
authors.initials: A
authors.lastname: Işimer
mesh_terms: D000293:Adolescent; D000975:Antioxidants / Q000378:metabolism*; D002648:Child; D002675:Child, Preschool; D003300:Copper / Q000097:blood; D004314:Down Syndrome / Q000097:blood* / Q000201:enzymology*; D005260:Female; D005979:Glutathione Peroxidase / Q000097:blood*; D006801:Humans; D008297:Male; D012643:Selenium / Q000097:blood; D013482:Superoxide Dismutase / Q000097:blood*; D014131:Trace Elements / Q000097:blood*; D015032:Zinc / Q000097:blood
chemical_list: D000975:Antioxidants; D014131:Trace Elements; D003300:Copper; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D012643:Selenium; D015032:Zinc