Cited by 1,282Iron Metabolism and DisordersFerroptosis and cancer prognosisNeurological diseases and metabolism

Hepcidin and iron homeostasis

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Ganz, Tomas, Nemeth, Elizabeta·2012·Biochimica et Biophysica Acta (BBA) - Molecular Cell Research

Abstract

Despite fluctuations in dietary iron intake and intermittent losses through bleeding, the plasma iron concentrations in humans remain stable at 10-30 μM. While most of the iron entering blood plasma comes from recycling, appropriate amount of iron is absorbed from the diet to compensate for losses and maintain nontoxic amounts in stores. Plasma iron concentration and iron distribution are similarly regulated in laboratory rodents. The hepatic peptide hepcidin was identified as the systemic iron-regulatory hormone. In the efferent arc, hepcidin regulates intestinal iron absorption, plasma iron concentrations, and tissue iron distribution by inducing degradation of its receptor, the cellular iron exporter ferroportin. Ferroportin exports iron into plasma from absorptive enterocytes, from macrophages that recycle the iron of senescent erythrocytes, and from hepatocytes that store iron. In the more complex and less well understood afferent arc, hepatic hepcidin synthesis is transcriptionally regulated by extracellular and intracellular iron concentrations through a molecular complex of bone morphogenetic protein receptors and their iron-specific ligands, modulators and iron sensors. Through as yet undefined pathways, hepcidin is also homeostatically regulated by the iron requirements of erythroid precursors for hemoglobin synthesis. In accordance with the role of hepcidin-mediated iron redistribution in host defense, hepcidin production is regulated by inflammation as well. Increased hepcidin concentrations in plasma are pathogenic in iron-restrictive anemias including anemias associated with inflammation, chronic kidney disease and some cancers. Hepcidin deficiency causes iron overload in hereditary hemochromatosis and ineffective erythropoiesis. Hepcidin, ferroportin and their regulators represent potential targets for the diagnosis and treatment of iron disorders and anemias. This article is part of a Special Issue entitled: Cell Biology of Metals.

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Crossref · 10.1016/j.bbamcr.2012.01.014

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  • Haem-bound iron is released from erythrocytes within macrophages by haem oxygenase (HO-1) and is further transported to the bone marrow for erythropoiesis via transferrin.

    “Haem-bound iron is released from erythrocytes within macrophages by haem oxygenase (HO-1) and is further transported to the bone marrow for erythropoiesis via transferrin (Ganz and Nemeth, 2012).”

    From Iron at the Centre of Candida albicans Interactions (2018) · cites this paper as Ganz and Nemeth, 2012

    Section 2.1 says macrophages degrade old erythrocytes, return their iron to plasma transferrin, and that transferrin-bound iron is mostly destined for erythrocyte production in the bone marrow. Section 4.6 mentions heme degradation in macrophages and heme oxygenase-1, but does not state that HO-1 releases the iron from heme. That specific enzymatic step is not supported by our copy. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Daily iron uptake from diet via duodenal enterocytes is minimal (1-2 mg per day) compared to daily iron requirements, especially for hemoglobin synthesis, which requires approximately 20−25 mg iron.

    “Daily iron uptake from diet via duodenal enterocytes is minimal (1–2 mg per day) compared to daily iron requirements, especially for hemoglobin synthesis, which requires approximately 20−25 mg iron (Ganz and Nemeth, 2012).”

    From Iron at the Centre of Candida albicans Interactions (2018) · cites this paper as Ganz and Nemeth, 2012

  • Hepcidin is a liver-derived hormone that regulates introduction of iron into plasma from three major sources: iron stored within hepatocytes, absorbed iron in the duodenal enterocytes, and iron recycled from macrophages.

    “Hepcidin is a liver-derived hormone that regulates introduction of iron into plasma from three major sources: iron stored within hepatocytes, absorbed iron in the duodenal enterocytes and iron recycled from macrophages (Ganz and Nemeth, 2012; Pantopoulos et al., 2012).”

    From Iron at the Centre of Candida albicans Interactions (2018) · cites this paper as Ganz and Nemeth, 2012

  • Hepcidin regulates cellular iron efflux via degradation of ferroportin 1, which induces cellular iron retention in macrophages and reduces duodenal iron absorption.

    “Hepcidin regulates cellular iron efflux via degradation of the sole cellular iron exporter ferroportin 1 (FPN1), which induces cellular iron retention in macrophages and reduces duodenal iron absorption [5, 6].”

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Authors
Ganz, T., & Nemeth, E.
Affiliations
University of California, Los Angeles (US)
Corresponding author
Ganz, Tomas
Venue
Biochimica et Biophysica Acta (BBA) - Molecular Cell Research
Publisher
Elsevier BV
Published
2012-09
Volume
1823
Issue
9
Pages
1434-1443
ISSN
0167-4889 (ISSN-L)
OpenAlex
W2028034405
Cited by
1,282
References
102
Citations by year
2026: 86 · 2025: 72 · 2024: 70 · 2023: 88 · 2022: 103 · 2021: 120 · 2020: 111 · 2019: 103 · 2018: 113 · 2017: 76 · 2016: 88 · 2015: 78 · 2014: 88 · 2013: 66 · 2012: 18
FWCI
12.66
Type
journal article
Language
en
Open access
Locations
  • Biochimica et Biophysica Acta (BBA) - Molecular Cell Research (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute of Diabetes and Digestive and Kidney Diseases (R01DK065029, R01DK082717)
Topics
  • Health Sciences › Medicine › Hematology › Iron Metabolism and Disorders
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Ferroptosis and cancer prognosis
  • Life Sciences › Neuroscience › Neurology › Neurological diseases and metabolism
Keywords
hepcidin, iron homeostasis, ferroportin, iron absorption, inflammation, iron overload, hereditary hemochromatosis, chronic kidney disease, BMP signaling, iron recycling
MeSH terms
Iron Deficiencies, Ferroportin, Animals, Cations, Divalent, Erythropoiesis, Homeostasis, Humans, Iron, Liver, Anemia, Iron-Deficiency, Iron Overload, Hepatocytes, Antimicrobial Cationic Peptides, Cation Transport Proteins, Bone Morphogenetic Protein Receptors, Hepcidins

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