title: Gamma glutamyl transferase activity is independently associated with oxidative stress rather than SYNTAX score.
abstract: BACKGROUND
  Gamma glutamyl transferase (GGT) is involved in the pathophysiologic process of coronary atherosclerosis. GGT activity plays a role in the catabolism of glutathione which is known as one of the major antioxidants. However, there is a lack of research on direct examination of relevance between serum GGT activity with systemic oxidative stress.
  
  
  OBJECTIVE
  We aimed to investigate the relationship between GGT activity with systemic oxidative stress markers and the extent and complexity of coronary artery disease (CAD) assessed with SYNTAX score in stable CAD.
  
  
  METHODS
  Measurements were obtained from 359 patients with stable CAD (Mean age = 57.7 ± 10.1 years). The patients were divided into two groups according to the median GGT level (GGT < median group < 22 and GGT > median group ≥ 22). Angiography was performed and SYNTAX score was calculated in all patients. Oxidative stress markers (total oxidant status [TOS], total antioxidant capacity [TAC] and oxidative stress index [OSI]) were measured in all patients.
  
  
  RESULTS
  While SYNTAX score and oxidative stress markers such as TOS and OSI have been increased, TAC was decreased in GGT > median group compared with GGT < median group (p < 0.05, for all). GGT activity was independently associated with diabetes (β = 0.106, p = 0.015) and OSI (β = 0.556, p < 0.001) in multiple linear regression analysis. However, the independent association between GGT activity and SYNTAX score was not found in present study (β = 0.063, p = 0.238).
  
  
  CONCLUSIONS
  In stable CAD, increased GGT activity within the normal range is associated with increased oxidative stress rather than increased extent and complexity of CAD.
authors.affiliation: Department of Cardiology, Adana Numune Training and Research Hospital , Adana.
authors.forename: Hakan
authors.initials: H
authors.lastname: Uçar
authors.forename: Mustafa
authors.initials: M
authors.lastname: Gür
authors.forename: Mehmet Yavuz
authors.initials: MY
authors.lastname: Gözükara
authors.forename: Gülhan Yüksel
authors.initials: GY
authors.lastname: Kalkan
authors.forename: Ahmet Oytun
authors.initials: AO
authors.lastname: Baykan
authors.forename: Caner
authors.initials: C
authors.lastname: Türkoğlu
authors.forename: Onur
authors.initials: O
authors.lastname: Kaypakl
authors.forename: Taner
authors.initials: T
authors.lastname: Şeker
authors.forename: Ömer
authors.initials: Ö
authors.lastname: Şen
authors.forename: Şahbettın
authors.initials: Ş
authors.lastname: Selek
authors.forename: Murat
authors.initials: M
authors.lastname: Çayl
mesh_terms: D000368:Aged; D015415:Biomarkers / Q000097:blood; D003324:Coronary Artery Disease / Q000097:blood* / Q000201:enzymology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018384:Oxidative Stress; D005723:gamma-Glutamyltransferase / Q000097:blood*
chemical_list: D015415:Biomarkers; D005723:gamma-Glutamyltransferase
keywords: GGT; Oxidative stress; SYNTAX; coronary artery disease; stable patients