Abstract
In the past 8 years, there has been renewed interest in the role of iron in both acute kidney injury (AKI) and chronic kidney disease (CKD). In patients with kidney diseases, renal tubules are exposed to a high concentration of iron owing to increased glomerular filtration of iron and iron-containing proteins, including haemoglobin, transferrin and neutrophil gelatinase-associated lipocalin (NGAL). Levels of intracellular catalytic iron may increase when glomerular and renal tubular cells are injured. Reducing the excessive luminal or intracellular levels of iron in the kidney could be a promising approach to treat AKI and CKD. Understanding the role of iron in kidney injury and as a therapeutic target requires insight into the mechanisms of iron metabolism in the kidney, the role of endogenous proteins involved in iron chelation and transport, including hepcidin, NGAL, the NGAL receptor and divalent metal transporter 1, and iron-induced toxic effects. This Review summarizes emerging knowledge, which suggests that complex mechanisms of iron metabolism exist in the kidney, modulated directly or indirectly by cellular iron content, inflammation, ischaemia and oxidative stress. The potential exists for prevention and treatment of iron-induced kidney injury by customized iron removal or relocation, aided by detailed insight into the underlying pathological mechanisms.
Key Points
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Iron content in the kidneys is increased in patients with chronic kidney disease or acute kidney injury, and is associated with proteinuria, haematuria or haemoglobinuria
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Increased local exposure to iron in the kidney may have a role in causing acute kidney injury, development and progression of kidney disease and in causing end-stage renal disease
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Decreasing the excessive iron in the kidneys may be a novel approach to treat acute kidney injury and chronic kidney disease
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The kidneys express many proteins that are involved in iron metabolism and transport
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The precise role and regulation of many proteins involved in renal iron metabolism and iron-induced kidney injury is poorly understood
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Acknowledgements
The authors' research work is partly funded by an Innovation grant from the Dutch Kidney foundation (to R. Masereeuw, J. F. M. Wetzels and D. W. Swinkels; project number IP 12.81).
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A. M. F. Martines researched data for the article and wrote the manuscript. A. M. F. Martines, R. Masereeuw, H. Tjalsma, J. G. Hoenderop, J. F. M. Wetzels and D. W. Swinkels contributed substantially to discussions of the content and/or editing of the manuscript before submission.
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Supplementary information
Supplementary Table 1
Findings indicative of iron-related kidney injury in haem-related diseases (DOC 145 kb)
Supplementary Table 2
Findings indicative of iron-related kidney injury in systemic iron overload (DOC 84 kb)
Supplementary Table 3
Findings indicative of iron-related kidney injury in glomerulopathy (DOC 127 kb)
Supplementary Table 4
Findings indicative of iron-related kidney injury in ischaemia-reperfusion kidney injury (DOC 53 kb)
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Martines, A., Masereeuw, R., Tjalsma, H. et al. Iron metabolism in the pathogenesis of iron-induced kidney injury. Nat Rev Nephrol 9, 385–398 (2013). https://doi.org/10.1038/nrneph.2013.98
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DOI: https://doi.org/10.1038/nrneph.2013.98
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