Serum non-transferrin bound iron in hemodialysis patients not receiving intravenous iron.
BACKGROUND
Non-transferrin bound iron (NTBI) has been found to be raised in end stage renal disease (ESRD) patients on hemodialysis (HD) receiving intravenous (IV) iron. Such NTBI is proposed to cause oxidative damage to biomolecules.


METHODS
NTBI, both ferrous (Fe(+2)) and ferric (Fe(+3)) forms, serum ferritin, protein thiols and lipid hydroperoxides were estimated by spectrophotometric and electrochemiluminescence immunoassay methods in patients with chronic renal failure (CRF), patients with ESRD on HD not receiving IV iron, and in normal controls.


RESULTS
NTBI (Fe(+2)) in HD patients not receiving IV iron was higher than in normal controls. NTBI (Fe(+3)) was significantly higher in HD patients not on IV iron therapy than in CRF and normal controls. There was no significant increase in NTBI in CRF patients when compared to normal controls. Serum ferritin was higher in HD patients compared to CRF and normal controls. There was a significant increase in lipid hydroperoxides and protein thiols in HD patients and CRF patients when compared to normal controls. The NTBI did not correlate with serum ferritin and oxidative markers.


CONCLUSIONS
The source of NTBI in hemodialysis is not only IV iron therapy but also the hemodialysis procedure per se. It may be due to microhemolysis during hemodialysis. The NTBI is however found to be catalytically inactive.
Department of Biochemistry, Kasturba Medical College, Manipal 576104, India.
Mungli
M
Prakash
Sharmila
S
Upadhya
Ravindra
R
Prabhu
D000328:Adult; D015415:Biomarkers / Q000097:blood; D016022:Case-Control Studies; D005260:Female; D006461:Hemolysis; D006801:Humans; D007501:Iron / Q000097:blood*; D007676:Kidney Failure, Chronic / Q000097:blood* / Q000473:pathology; D008054:Lipid Peroxides / Q000097:blood; D008297:Male; D008875:Middle Aged; D018384:Oxidative Stress; D006435:Renal Dialysis / Q000009:adverse effects*; D013438:Sulfhydryl Compounds / Q000097:blood
D015415:Biomarkers; D008054:Lipid Peroxides; D013438:Sulfhydryl Compounds; D007501:Iron