title: Effect of vitamin E therapy on oxidative stress and erythrocyte osmotic fragility in patients on peritoneal dialysis and hemodialysis.
abstract: BACKGROUND
  Several medications have been tested with the aim of decreasing oxidative stress and erythrocyte osmotic fragility in patients on dialysis. The aim of the present study was to assess the influence of vitamin E therapy on oxidative stress and erythrocyte osmotic fragility in patients on hemodialysis (HD) and peritoneal dialysis (PD).
  
  
  METHODS
  This was a placebo-controlled study. The study was performed on 34 HD patients, 13 PD patients and 22 healthy volunteers with a mean age of 45.57 +/- 8.54 years. HD patients were divided into 2 groups: treatment (n=19) and control (n=15). Vitamin E was administered, 300 mg/day, to the HD treatment group and PD patients for 20 weeks. Lipid peroxidation, antioxidant condition and erythrocyte osmotic fragility (EOF) were examined before and after treatment.
  
  
  RESULTS
  Before the treatment, the levels of EOF (p<0.001) and malondialdehyde (MDA) (p<0.001) were significantly lower, and erythrocyte superoxide dismutase (SOD) (p=0.001) and vitamin E levels (p<0.001) were significantly higher in the healthy group than PD and HD groups. Serum vitamin E increased from 0.93 +/- 0.16 to 1.09 +/- 0.14 mg/dL (p=0.001), EOF decreased from 0.49% +/- 0.03% to 0.42% +/- 0.04% NaCl (p<0.001), and plasma MDA values decreased from 2.77 +/- 0.87 to 2.20 +/- 0.767 nmol/mL (p=0.018) in the HD treatment group after vitamin E treatment. Levels of EOF decreased from 0.51% +/- 0.09% to 0.43% +/- 0.03% NaCl in the PD treatment group after vitamin E treatment (p=0.021).
  
  
  CONCLUSIONS
  Vitamin E therapy is effective in decreasing the levels of EOF in patients on HD and PD, and it is also effective in decreasing lipid peroxidation in patients on HD.
authors.affiliation: Department of Nephrology, Ataturk Training and Research Hospital, Izmir, Turkey. info@omertoprak.com
authors.forename: Atilla
authors.initials: A
authors.lastname: Uzum
authors.forename: Omer
authors.initials: O
authors.lastname: Toprak
authors.forename: M Koray
authors.initials: MK
authors.lastname: Gumustas
authors.forename: Sentrurk
authors.initials: S
authors.lastname: Ciftci
authors.forename: Saniye
authors.initials: S
authors.lastname: Sen
mesh_terms: D000328:Adult; D000975:Antioxidants / Q000008:administration & dosage* / Q000493:pharmacokinetics; D005260:Female; D006801:Humans; D015227:Lipid Peroxidation / Q000187:drug effects; D008297:Male; D008315:Malondialdehyde / Q000097:blood; D008875:Middle Aged; D009996:Osmotic Fragility / Q000187:drug effects; D018384:Oxidative Stress / Q000187:drug effects*; D011446:Prospective Studies; D006435:Renal Dialysis; D014810:Vitamin E / Q000008:administration & dosage* / Q000493:pharmacokinetics
chemical_list: D000975:Antioxidants; D014810:Vitamin E; D008315:Malondialdehyde