Induction of protein oxidation by intravenous iron in hemodialysis patients: Role of inflammation

David Tovbin, Dalia Mazor, Marina Vorobiov, Cidio Chaimovitz, Naomi Meyerstein

Research output: Contribution to journalArticlepeer-review

109 Scopus citations

Abstract

Background: Oxidative stress and inflammation contribute to the high prevalence and severity of atherosclerosis, infections, and β2-microglobulin amyloidosis; and thus, to reduced survival rate and quality of life in hemodialysis (HD) patients. Inflammation induces oxidative stress by production of the oxidants: superoxide anion, hydrogen peroxide, and hypochlorite. Intravenous iron (IVIR), administered in HD patients to correct anemia, can release free iron, that may react with hydrogen peroxide to produce the strong oxidant hydroxyl radical. Inflammation-induced lipid and protein oxidation and IVIR-induced lipid oxidation were shown in HD patients. However, IVIR-induced protein oxidation and a relationship between inflammation and IVIR-induced oxidative stress have not been reported to date. Methods: We examined the effect of IVIR administration on markers of protein oxidation in HD patients (advanced oxidation protein products [AOPPs], thiol, and dityrosine) in relation to such inflammatory markers as C-reactive protein (CRP) and tumor necrosis factor-α (TNF-α). Iron saccharate, 100 mg, was administered to 19 HD patients for 1 hour after 3.5 hours of high-flux dialysis. Blood samples were drawn pre-HD, pre-IVIR, and post-IVIR for iron, transferrin, TNF-α, AOPP, thiol, total antioxidant capacity (TEAC), and dityrosine levels and pre-HD for ferritin and CRP levels. Results: IVIR administration induced a 37% increase in AOPP level (P < 0.001), which correlated positively with pre-HD CRP level (r = 0.72; P < 0.05) and was greater in patients with a greater pre-HD TNF-α level (P < 0.05). IVIR administration did not affect TEAC, thiol, dityrosine, or TNF-α levels. Conclusion: IVIR administration induced an increase in protein oxidation (AOPP levels) that was related to the degree of inflammation.

Original languageEnglish
Pages (from-to)1005-1012
Number of pages8
JournalAmerican Journal of Kidney Diseases
Volume40
Issue number5
DOIs
StatePublished - 1 Jan 2002

Keywords

  • Advanced oxidation protein products (AOPPs)
  • Anemia
  • C-reactive protein (CRP)
  • Dityrosine
  • Hemodialysis (HD)
  • Hydrogen peroxide
  • Hydroxyl radical
  • Inflammation
  • Intravenous iron (IVIR)
  • Iron
  • Oxidative stress
  • Reactive oxygen species
  • Superoxide
  • Thiols

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