title: Paraoxonase and arylesterase levels in autoimmune thyroid diseases.
abstract: OBJECTIVE
  The aim of this study was to evaluate serum paraoxonase-1 (PON1) activity and its association with oxidative stress in autoimmune thyroid disease (AITD).
  
  
  METHODS
  A total of 50 patients with AITD, including 25 with Hashimoto's thyroiditis and 25 with Graves' disease were enrolled. The control group comprised 27 healthy subjects. Blood samples were obtained in the euthyroid period and 3 months after initiation of medical treatment. Serum samples from patients with AITD and the healthy control group were analyzed for basal PON1, salt-stimulated PON1, and arylesterase (ARE) activities, along with lipid hydroperoxide (LOOH) and total free sulfhydryl (-SH) levels.
  
  
  RESULTS
  Serum PON1 activities and -SH levels were significantly lower (P < 0.001, for each), whereas LOOH levels were significantly higher (P < 0.001, for each) in patients with AITD, compared to the control group. We observed no significant differences in ARE levels between the patient and healthy control groups (P > 0.05). PON1 activity was positively correlated with -SH (r = 0.522, P < 0.001) and negatively correlated with LOOH (r = -0.487, P < 0.001). PON1 phenotype distribution of the subjects was not significantly different among the three groups (P = 0.961).
  
  
  CONCLUSIONS
  Serum PON1 activity is decreased in patients with AITD, and correlated positively with -SH, a well-known antioxidant, and negatively with LOOH, an index of lipid oxidation.
authors.affiliation: a Edirne State Hospital, Endocrinology and Metabolic Disease , 22030 , Turkey.
authors.forename: Hakan
authors.initials: H
authors.lastname: Korkmaz
authors.affiliation: b Faculty of Medicine, Department of Internal Medicine, Division of Endocrinology , Gaziantep University , 27100 Sahinbey , Turkey.
authors.forename: Suzan
authors.initials: S
authors.lastname: Tabur
authors.affiliation: b Faculty of Medicine, Department of Internal Medicine, Division of Endocrinology , Gaziantep University , 27100 Sahinbey , Turkey.
authors.forename: Mesut
authors.initials: M
authors.lastname: Ozkaya
authors.affiliation: c Faculty of Medicine, Department of Medical Pharmacology , Harran University , 63300 Sanliurfa , Turkey.
authors.forename: Elif
authors.initials: E
authors.lastname: Oguz
authors.affiliation: d Faculty of Medicine, Department of Nuclear Medicine , Gaziantep University , 27100 Sahinbey , Turkey.
authors.forename: Umut
authors.initials: U
authors.lastname: Elboga
authors.affiliation: e Faculty of Medicine, Department of Clinical Biochemistry , Harran University , 63300 Sanliurfa , Turkey.
authors.forename: Nurten
authors.initials: N
authors.lastname: Aksoy
authors.affiliation: b Faculty of Medicine, Department of Internal Medicine, Division of Endocrinology , Gaziantep University , 27100 Sahinbey , Turkey.
authors.forename: Ersin
authors.initials: E
authors.lastname: Akarsu
mesh_terms: D000328:Adult; D000975:Antioxidants / Q000378:metabolism; D043303:Aryldialkylphosphatase / Q000097:blood*; D005260:Female; D006111:Graves Disease / Q000097:blood / Q000201:enzymology; D050031:Hashimoto Disease / Q000097:blood / Q000201:enzymology; D006801:Humans; D008054:Lipid Peroxides / Q000097:blood; D008297:Male; D008875:Middle Aged; D010084:Oxidation-Reduction; D018384:Oxidative Stress; D011446:Prospective Studies; D013959:Thyroid Diseases / Q000097:blood* / Q000201:enzymology*; D013967:Thyroiditis, Autoimmune / Q000097:blood / Q000201:enzymology
chemical_list: D000975:Antioxidants; D008054:Lipid Peroxides; D043303:Aryldialkylphosphatase; C468406:PON1 protein, human
keywords: Arylesterase; Autoimmune thyroid disease; Oxidative status; Paraoxonase