The role of the oxidative state of glutathione and glutathione-related enzymes in anemia of hemodialysis patients.
OBJECTIVE
To investigate the oxidative state of glutathione and glutathione peroxidase (GSH-Px), glutathione reductase (GSSG-R), and glucose-6-phosphate dehydrogenase (G-6-PD) levels in patients with chronic renal failure (CRF) and controls.


RESULTS
Erythrocyte GSH levels of patients were decreased, but GSSG was not significantly different from that of controls. Also, plasma GSH levels were not different, although GSSG was increased. GSSG/GSH ratios in erythrocyte and plasma were significantly higher in CRF patients. Erythrocyte GSSG-R activity was high, but G-6-PD and GPX were low.


CONCLUSIONS
The findings suggest that: 1. Low GSH is related to decreased G-6-PD activities. 2. The reduction of peroxides with GPX are decreased by low GSH and low GPX activity. 3. GSSG may react with hemoglobin and causes protein aggregation in erythrocytes. These alterations cause hemolysis and could play a role in the pathogenesis of anemia in hemodialyzed patients.
Paşaoğlu
H
H
Department of Biochemistry, Erciyes University Medical Faculty, Kayseri, Turkey. unsal@vm.cc.erciyes.edu.tr
Muhtaroğlu
S
S
Güneş
M
M
Utaş
C
C
D000293:Adolescent; D000328:Adult; D000743:Anemia, Hemolytic / Q000097:blood*; D005260:Female; D005954:Glucosephosphate Dehydrogenase / Q000097:blood*; D005978:Glutathione / Q000097:blood*; D005979:Glutathione Peroxidase / Q000097:blood*; D005980:Glutathione Reductase / Q000097:blood*; D006801:Humans; D007676:Kidney Failure, Chronic / Q000097:blood / Q000628:therapy; D008297:Male; D008875:Middle Aged; D006435:Renal Dialysis
D005954:Glucosephosphate Dehydrogenase; D005979:Glutathione Peroxidase; D005980:Glutathione Reductase; D005978:Glutathione