Non-transferrin bound iron, cytokine activation and intracellular reactive oxygen species generation in hemodialysis patients receiving intravenous iron dextran or iron sucrose - BioMetals
- ️Hicks, Paul
- ️Thu Jan 13 2011
Abstract
Intravenous (IV) iron supplementation is widely used to support erythropoeisis in hemodialysis patients. IV iron products are associated with oxidative stress that has been measured principally by circulating biomarkers such as products of lipid peroxidation. The pro-oxidant effects of IV iron are presumed to be due at least in part, by free or non-transferrin bound iron (NTBI). However, the effects of IV iron on intracellular redox status and downstream effectors is not known. This prospective, crossover study compared cytokine activation, reactive oxygen species generation and oxidative stress after single IV doses of iron sucrose and iron dextran. This was a prospective, open-label, crossover study. Ten patients with end-stage renal disease (ESRD) on hemodialysis and four age and sex-matched healthy were assigned to receive 100 mg of each IV iron product over 5 min in random sequence with a 2 week washout between products. Subjects were fasted and fed a low iron diet in the General Clinical Research Center at the University of New Mexico. Serum and plasma samples for IL-1, IL-6, TNF-α and IL-10 and NTBI were obtained at baseline, 60 and 240 min after iron infusion. Peripheral blood mononuclear cells (PBMC) were isolated at the same time points and stained with fluorescent probes to identify intracellular reactive oxygen species and mitochondrial membrane potential (Δψm) by flow cytometry. Lipid peroxidation was assessed by plasma F2 isoprostane concentration. Mean ± SEM maximum serum NTBI values were significantly higher among patients receiving IS compared to ID (2.59 ± 0.31 and 1.0 ± 0.36 µM, respectively, P = 0.005 IS vs. ID) Mean ± SEM NTBI area under the serum concentration–time curve (AUC) was 3-fold higher after IS versus ID (202 ± 53 vs. 74 ± 23 µM*min/l, P = 0.04) in ESRD patients, indicating increased exposure to NTBI. IV iron administration was associated with increased pro-inflammatory cytokines. Serum IL-6 concentrations increased most profoundly, with a 2.6 and 2.1 fold increase from baseline in ESRD patients given IS and ID, respectively (P < 0.05 compared to baseline). In healthy controls, serum IL-6 was undetectable at baseline and after IV iron administration. Most ESRD patients had increased intracellular ROS generation, however, there was no difference between ID and IS. Only one healthy control had increased ROS generation post IV iron. All healthy controls experienced a loss of Δψm (100% with IS and 50% with ID). ESRD patients also had loss of Δψm with a nadir at 240 min. IS administration was associated with higher maximum serum NTBI concentrations compared to ID, however, the both compounds produced similar ROS generation and cytokine activation that was more pronounced among ESRD patients. The effect of IV iron-induced ROS production on pivotal signaling pathways needs to be explored.
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Acknowledgments
This project was supported in part by the American College of Clinical Pharmacy Watson Laboratories Anemia Research Award and by the University of New Mexico General Clinical Research Center DHHS/NIH/NCRR/GCRC 5M01RR00997.
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Authors and Affiliations
Department of Pharmacy Practice, ANephRx-Albany Nephrology Pharmacy Group, Albany College of Pharmacy and Health Sciences, 106 New Scotland Avenue, Albany, NY, 12208, USA
Amy Barton Pai
VA Cooperative Studies Program, Albuquerque Veteran Affairs Medical Center, 1501 San Pedro NE, Albuquerque, NM, 87108, USA
Todd Conner
College of Pharmacy, University of New Mexico, 2502 Marble NE, Albuquerque, NM, 87106, USA
Charles R. McQuade, Jonathan Olp & Paul Hicks
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- Todd Conner
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- Charles R. McQuade
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- Jonathan Olp
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- Paul Hicks
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Correspondence to Amy Barton Pai.
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Pai, A.B., Conner, T., McQuade, C.R. et al. Non-transferrin bound iron, cytokine activation and intracellular reactive oxygen species generation in hemodialysis patients receiving intravenous iron dextran or iron sucrose. Biometals 24, 603–613 (2011). https://doi.org/10.1007/s10534-011-9409-6
Received: 11 August 2010
Accepted: 05 January 2011
Published: 13 January 2011
Issue Date: August 2011
DOI: https://doi.org/10.1007/s10534-011-9409-6