title: [The evaluation of selected oxidative stress parameters in patients with hyperthyroidism].
abstract: BACKGROUND
  Hyperthyroidism induces the acceleration of the basic metabolism and increases cellular oxygen utilization, consequently intensifies reactive oxygen species production and disturbs the oxidant-antioxidant balance.
  
  
  OBJECTIVE
  The objective of this study was to evaluate the selected oxidative stress parameters in patients with hyperthyroidism by analysis of the reactive oxygen species neutralizing enzymes activity--superoxide dismutase (SOD), glutathione peroxidase (GSHPx) and catalase (CAT), the estimation of free radical processes intensity--concentration of malondialdehyde (MDA), sulfhydryl groups (SH) in proteins and by quantification of the serum total antioxidant status (TAS).
  
  
  METHODS
  . Twenty-seven patients treated for hyperthyroidism and 12 healthy individuals were enrolled in the study. Enzyme activity (SOD, GSHPx, CAT), MDA and concentration of SH groups were analysed in erythrocytes, while TAS was measured in serum.
  
  
  RESULTS
  Patients with hyperthyroidism compared with healthy subjects were characterized by a higher GSHPx activity in erythrocytes, lower serum TAS, the lower content of SH groups in proteins and the lower MDA concentration in erythrocytes.
  
  
  CONCLUSIONS
  Our results suggest that hyperthyroidism increases oxidative stress and disturbs oxidant-antioxidant balance in the body. Thyreostatic treatment, if not leads to whole metabolic compensation, may only reduce oxidant-antioxidant disorders, however is not able to eliminate them entirely.
authors.affiliation: Klinika Chorób Wewnetrznych z Oddziałem Farmakologii Klinicznej i Terapii Monitorowanej, Uniwersytet Medyczny, Lódź.
authors.forename: Grzegorz
authors.initials: G
authors.lastname: Andryskowski
authors.forename: Tomasz
authors.initials: T
authors.lastname: Owczarek
mesh_terms: D000328:Adult; D000368:Aged; D016022:Case-Control Studies; D002374:Catalase / Q000378:metabolism; D005260:Female; D005609:Free Radicals / Q000378:metabolism*; D005979:Glutathione Peroxidase / Q000378:metabolism; D006801:Humans; D006980:Hyperthyroidism / Q000201:enzymology* / Q000378:metabolism* / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D018384:Oxidative Stress; D017382:Reactive Oxygen Species / Q000378:metabolism*; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D005609:Free Radicals; D017382:Reactive Oxygen Species; D002374:Catalase; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase