Cited by 229Iron Metabolism and DisordersTuberculosis Research and EpidemiologyAntimicrobial Peptides and Activities

Expression and localization of hepcidin in macrophages: a role in host defense against tuberculosis

Sow, Fatoumata B, Florence, William C, Satoskar, Abhay R, Schlesinger, Larry S, Zwilling, Bruce S, Lafuse, William P·2007·Journal of Leukocyte Biology

Abstract

Hepcidin is an antimicrobial peptide produced by the liver in response to inflammatory stimuli and iron overload. Hepcidin regulates iron homeostasis by mediating the degradation of the iron export protein ferroportin 1, thereby inhibiting iron absorption from the small intestine and release of iron from macrophages. Here, we examined the expression of hepcidin in macrophages infected with the intracellular pathogens Mycobacterium avium and Mycobacterium tuberculosis. Stimulation of the mouse RAW264.7 macrophage cell line and mouse bone marrow-derived macrophages with mycobacteria and IFN-γ synergistically induced high levels of hepcidin mRNA and protein. Similar results were obtained using the human THP-1 monocytic cell line. Stimulation of macrophages with the inflammatory cytokines IL-6 and IL-β did not induce hepcidin mRNA expression. Iron loading inhibited hepcidin mRNA expression induced by IFN-γ and M. avium, and iron chelation increased hepcidin mRNA expression. Intracellular protein levels and secretion of hepcidin were determined by a competitive chemiluminescence ELISA. Stimulation of RAW264.7 cells with IFN-γ and M. tuberculosis induced intracellular expression and secretion of hepcidin. Furthermore, confocal microscopy analyses showed that hepcidin localized to the mycobacteria-containing phagosomes. As hepcidin has been shown to possess direct antimicrobial activity, we investigated its activity against M. tuberculosis. We found that hepcidin inhibited M. tuberculosis growth in vitro and caused structural damage to the mycobacteria. In summary, our data show for the first time that hepcidin localizes to the phagosome of infected, IFN-γ-activated cells and has antimycobacterial activity.

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Crossref · 10.1189/jlb.0407216

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  • M. tuberculosis can stimulate hepcidin formation in macrophages and subvert ferroportin-mediated iron excess, ensuring iron retention within the macrophage.

    “However, M. tuberculosis can also stimulate the formation of hepcidin in MΦs and subvert the stimulation of ferroportin-mediated iron excess and ensure iron retention within the MO (197).”

    From Macrophage defense mechanisms against intracellular bacteria (2015) · cites this paper as [197]

  • Very high concentrations of hepcidin have been shown to inhibit M. tuberculosis growth in vitro.

    “Similarly, very high concentrations of hepcidin have been shown to inhibit M. tuberculosis growth in vitro [32], but it is unknown whether these concentrations are relevant to in vivo infections.”

    From Hepcidin and Host Defense against Infectious Diseases (2015) · cites this paper as [32]

  • The detrimental effect of hepcidin in intracellular infections has been demonstrated convincingly in vitro.

    “This effect has been demonstrated convincingly in vitro”

    From Hepcidin and Host Defense against Infectious Diseases (2015) · cites this paper as [32]

  • Hepcidin induces iron accumulation in macrophages.

    “hepcidin induces iron accumulation in macrophages”

    From Hepcidin and Host Defense against Infectious Diseases (2015) · cites this paper as [32]

  • Hepcidin may be detrimental in host defense against pathogens that occupy the intracellular niche.

    “may be detrimental in defense against pathogens that occupy this intracellular niche”

    From Hepcidin and Host Defense against Infectious Diseases (2015) · cites this paper as [32]

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Authors
Sow, F. B., Florence, W. C., Satoskar, A. R., Schlesinger, L. S., Zwilling, B. S., & Lafuse, W. P.
Affiliations
The Ohio State University (US)
Corresponding author
Lafuse, William P
Venue
Journal of Leukocyte Biology
Published
2007-07-03
Volume
82
Issue
4
Pages
934-945
ISSN
  • 0741-5400 (ISSN-L)
  • 1938-3673
OpenAlex
W2107072141
Cited by
229
References
52
Citations by year
2026: 6 · 2025: 7 · 2024: 10 · 2023: 6 · 2022: 12 · 2021: 19 · 2020: 7 · 2019: 12 · 2018: 9 · 2017: 14 · 2016: 10 · 2015: 17 · 2014: 12 · 2013: 18 · 2012: 13
FWCI
9.16
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Leukocyte Biology (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institutes of Health (RO1DK-57667)
Topics
  • Health Sciences › Medicine › Hematology › Iron Metabolism and Disorders
  • Health Sciences › Medicine › Infectious Diseases › Tuberculosis Research and Epidemiology
  • Life Sciences › Immunology and Microbiology › Microbiology › Antimicrobial Peptides and Activities
Keywords
hepcidin, macrophages, tuberculosis, Mycobacterium tuberculosis, Mycobacterium avium, iron homeostasis, ferroportin 1, interferon-gamma, antimicrobial activity, phagosome, host defense, iron chelation, iron loading
MeSH terms
Animals, Cell Line, Gene Expression Regulation, Homeostasis, Humans, Immunity, Innate, Interferon-gamma, Intestinal Absorption, Iron, Iron Chelating Agents, Liver, Mycobacterium avium, Mycobacterium tuberculosis, Phagosomes, RNA, Messenger, Tuberculosis, Iron Overload, Antimicrobial Cationic Peptides, Mice, Hepcidins

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