title: Evaluation of dynamic thiol/disulphide homeostasis as a novel indicator of oxidative stress in maple syrup urine disease patients under treatment.
abstract: Maple syrup urine disease (MSUD) is a metabolic disorder that is caused by deficiency of branched-chain α-keto acid dehydrogenase complex. Although accumulation of toxic metabolites is associated with neurotoxicity, mechanisms underlying brain damage remain unclear. Aim of this study is to evaluate thiol/disulphide homeostasis as a novel indicator of oxidative stress in MSUD patients under treatment. Twenty patients with MSUD and 20 healthy individuals were included in study. All patients were under regular follow-up and had a good metabolic control. Serum native thiol (-SH), total thiol (-SH + -S-S-), disulphide (-S-S) levels were measured in all subjects. Disulphide/native thiol, disulphide/total thiol and native thiol/total thiol ratios were calculated from these values. Simultaneous blood sampling for plasma quantitative amino acid analysis was performed in both groups. Any significant difference was not observed in -SH, -SH + -S-S-, -S-S levels between two groups. In addition no increase of disulphide/native thiol and disulphide/total thiol ratios was detected in patient group. This study is the first study that evaluates dynamic thiol/disulphide homeostasis as an indicator of oxidative stress in MSUD patients. Among previous studies that were made to determine oxidative stress in treated MSUD patients, this study had the largest sample size also. In recent studies, it was claimed that oxidative stress could be responsible from neurotoxicity even in treated patients. Here, dynamic thiol/disulfide homeostasis status showed that providing good metabolic control in MSUD patients prevent oxidative stress. Under regular follow-up and good compliance with diet, additional antioxidant therapies would possibly not be necessary.
authors.affiliation: Cerrahpasa Medical Faculty Department of Pediatric Division of Nutrition and Metabolism, Istanbul University, Kocamustafapasa Fatih, 34098, Istanbul, Turkey. tanyel0554@yahoo.com.
authors.forename: Tanyel
authors.initials: T
authors.lastname: Zubarioglu
authors.affiliation: Cerrahpasa Medical Faculty Department of Pediatric Division of Nutrition and Metabolism, Istanbul University, Kocamustafapasa Fatih, 34098, Istanbul, Turkey.
authors.forename: Ertugrul
authors.initials: E
authors.lastname: Kiykim
authors.affiliation: Cerrahpasa Medical Faculty Central Laboratory, Istanbul University, Istanbul, Turkey.
authors.forename: Mehmet Serif
authors.initials: MS
authors.lastname: Cansever
authors.affiliation: Department of Clinical Biochemistry, Faculty of Medicine, Yildirim Beyazit University, Ankara, Turkey.
authors.forename: Salim
authors.initials: S
authors.lastname: Neselioglu
authors.affiliation: Cerrahpasa Medical Faculty Department of Pediatric Division of Nutrition and Metabolism, Istanbul University, Kocamustafapasa Fatih, 34098, Istanbul, Turkey.
authors.forename: Cigdem
authors.initials: C
authors.lastname: Aktuglu-Zeybek
authors.affiliation: Department of Clinical Biochemistry, Faculty of Medicine, Yildirim Beyazit University, Ankara, Turkey.
authors.forename: Ozcan
authors.initials: O
authors.lastname: Erel
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D018753:Diet, Protein-Restricted; D004220:Disulfides / Q000097:blood*; D005260:Female; D006706:Homeostasis / Q000502:physiology*; D006801:Humans; D007223:Infant; D008297:Male; D008375:Maple Syrup Urine Disease / Q000178:diet therapy / Q000378:metabolism*; D018384:Oxidative Stress / Q000502:physiology*; D013438:Sulfhydryl Compounds / Q000097:blood*
chemical_list: D004220:Disulfides; D013438:Sulfhydryl Compounds
keywords: MSUD; Neurotoxicity; Oxidative stress; Thiol/disulphide homeostasis