title: Glutathione peroxidase, glutathione reductase and protein oxidation in patients with glioblastoma multiforme and transitional meningioma.
abstract: OBJECTIVE
  The aim of this study was to assess glutathione peroxidase (GPx), glutathione reductase (GRx) and protein oxidation (POx) levels in patients with glioblastoma multiforme (GBM) and transitional meningioma (TM) and to compare with normal brain tissues.
  
  
  METHODS
  GPx, GRx and POx levels were measured in 48 brain tumors obtained during surgery and 15 normal brain tissues that were collected during autopsy. Results were compared between two groups.
  
  
  RESULTS
  GPx and GRx activities were significantly lower in GBM and TM when compared to controls and the difference was statistically significant (P = 0.0001). Furthermore, the decrease in enzyme activities was more evident in GBM than in TM. In contrast, POx levels were found to be higher in both GBM and TM compared to controls and showed statistically significant difference (P = 0.00001). Increase in POx levels was clearer in GBM than TM.
  
  
  CONCLUSIONS
  GPx and GRx decreased and POx increased significantly in both GBM and TM when compared to normal brain tissues. Further, clinical studies with a larger patient population are required to show the role(s) of antioxidant enzymes in brain tumors more accurately.
authors: Department of Neurosurgery, Cerrahpasa Medical Faculty, Istanbul University, Istanbul, Turkey. tanerato2000@yahoo.com
authors: Taner
authors: T
authors: Tanriverdi
authors: Hakan
authors: H
authors: Hanimoglu
authors: Tibet
authors: T
authors: Kacira
authors: Galip Zihni
authors: GZ
authors: Sanus
authors: Rahsan
authors: R
authors: Kemerdere
authors: Pinar
authors: P
authors: Atukeren
authors: Koray
authors: K
authors: Gumustas
authors: Bulent
authors: B
authors: Canbaz
authors: Mehmet Yasar
authors: MY
authors: Kaynar
mesh_terms: D001932:Brain Neoplasms / Q000378:metabolism*; D005260:Female; D005909:Glioblastoma / Q000378:metabolism*; D005979:Glutathione Peroxidase / Q000378:metabolism*; D005980:Glutathione Reductase / Q000378:metabolism*; D006801:Humans; D015227:Lipid Peroxidation; D008297:Male; D008577:Meningeal Neoplasms / Q000378:metabolism*; D008579:Meningioma / Q000378:metabolism*; D008875:Middle Aged; D010084:Oxidation-Reduction; D011506:Proteins
chemical_list: D011506:Proteins; D005979:Glutathione Peroxidase; D005980:Glutathione Reductase