Cited by 315Iron Metabolism and DisordersCytokine Signaling Pathways and InteractionsTrace Elements in Health

STAT3 Is Required for IL-6-gp130–Dependent Activation of Hepcidin In Vivo

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Pietrangelo, Antonello, Dierssen, Uta, Valli, Linda, Garuti, Cinzia, Rump, Agrani, Corradini, Elena, Ernst, Matthias, Klein, Christian +1 more·2007·Gastroenterology

Abstract

Background & aims Hepcidin is a peptide hormone that is central to the regulation of iron homeostasis. In response to interleukin 6 (IL-6), hepatocytes produce hepcidin that decreases iron release/transfer from enterocytes and macrophages and causes hypoferremia. To clarify the molecular pathways involved in hepcidin activation by IL-6, we used different mice strains in which the main IL-6/gp130 signaling pathways have been genetically disrupted. Methods We generated mice with hepatocyte-specific deletion of the IL-6 signal-transducing gp130 receptor (alfpgp130 (LoxP/LoxP)), with a gp130 receptor lacking the essential region for STAT1 and -3 activation (alfpCre gp130(DeltaSTAT/LoxP)) or mice expressing a gp130 allele lacking the essential tyrosine for RAS-MAPK activation (alfpCregp130(Y757F/LoxP)). We studied gp130-dependent pathways and hepcidin mRNA expression by Western blot, reverse-transcription polymerase chain reaction, and Northern blot in vivo and ex vivo. Results IL-6 stimulated phospho STAT3, serum amyloid A (SAA), and suppressor of cytokine signaling 3 (SOCS3) expression in livers of wild-type and alfpCregp130(Y757F/LoxP) mice, whereas this response was blocked in alfpCre gp130(LoxP/LoxP) and alfpCre gp130(DeltaSTAT/LoxP) mice. In wild-type and alfpCregp130(Y757F/LoxP) animals, significantly higher hepcidin mRNA expression was found 3 to 6 hours after IL-6 stimulation. In contrast, no IL-6-dependent regulation of hepcidin mRNA expression was found in alfpgp130 (DeltaSTAT/LoxP) and AlfpCre gp130 (LoxP/LoxP) animals. In primary hepatocytes, higher hepcidin mRNA expression after IL-6 stimulation was only observed when gp130-STAT3-dependent signaling was intact. Conclusions We have demonstrated that both in vivo and in vitro STAT3 is the key transcription factor responsible for IL-6 activation of hepcidin gene expression in the liver.

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Crossref · 10.1053/j.gastro.2006.10.018

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  • IL-6 mediates these effects directly because it activates STAT3 to bind to the HAMP promoter, thus stimulating HAMP expression.

    “IL-6 mediates these effects directly because it activates STAT3 to bind e.g. to the HAMP promoter, thus stimulating HAMP expression (Pietrangelo et al., 2007;Wrighting and Andrews, 2006).”

    From Iron in infection and immunity (2020) · cites this paper as Pietrangelo et al., 2007

    The Discussion (page unavailable) identifies STAT3 as a key factor in IL-6-induced hepcidin transcription, and the paper reports STAT3 activation after IL-6 stimulation. It does not establish that STAT3 directly binds the HAMP promoter; it cites a separate promoter-fragment study and says the interplay of factors at the promoter remains unclear. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Most microbial infections raise IL-6 early; IL-6 then drives hepcidin transcription through JAK2-STAT3, requiring STAT3-binding sites in the HAMP promoter.

    “IL-6 is increased early in most microbial infections and it stimulates hepcidin transcription via the JAK2–STAT3 pathway in a manner dependent on STAT3-binding motifs in the promoter of HAMP (the hepcidin gene)89–91.”

    From Iron homeostasis in host defence and inflammation (2015) · cites this paper as [91]

  • STAT3 is a positive effector of hepcidin expression, and ROSs inhibit this effect, creating a link between ROSs and Fe metabolism.

    “STAT3 is another positive effector of hepcidin expression [347,348], and ROSs inhibit this effect [349], thereby creating a link between ROSs and Fe metabolism.”
  • The inflammatory increase in hepcidin is mainly caused by increased IL-6, which induces hepcidin gene transcription through the JAK2/STAT3 pathway.

    “The inflammatory increase in hepcidin is mainly caused by increased concentrations of IL-6 (interleukin-6) [19], inducing the transcription of the hepcidin gene through the JAK2/STAT3 [20][21][22] pathway.”

    From Iron and infection (2018) · cites this paper as [20]

  • In nonintestinal cells, circulating iron is bound to transferrin and imported via receptor-mediated endocytosis after binding to the transferrin receptor.

    “In nonintestinal cells, circulating iron is bound to transferrin (Tf) and is imported via receptor-mediated endocytosis after binding to the transferrin receptor (TfR) (249).”

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1 of the 43 references couldn’t be matched to a known paper.

Research works printed but not linked: 1

  1. Streetz KL, Wustefeld T, Klein C, et al. Lack of gp130 expression in hepatocytes promotes liver injury. Gastroenterology 2003; 125:532-543.

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Authors
Pietrangelo, A., Dierssen, U., Valli, L., Garuti, C., Rump, A., Corradini, E., Ernst, M., Klein, C., & Trautwein, C.
Affiliations
  • University of Modena and Reggio Emilia (IT)
  • Universitätsklinikum Aachen (DE)
  • Ludwig Cancer Research (BE)
Corresponding author
Trautwein, Christian
Venue
Gastroenterology
Publisher
Elsevier BV
Published
2007-01
Volume
132
Issue
1
Pages
294-300
ISSN
0016-5085 (ISSN-L)
OpenAlex
W2046878952
Cited by
315
References
43
Citations by year
2026: 4 · 2025: 10 · 2024: 8 · 2023: 11 · 2022: 9 · 2021: 15 · 2020: 14 · 2019: 13 · 2018: 17 · 2017: 23 · 2016: 18 · 2015: 16 · 2014: 25 · 2013: 25 · 2012: 19
FWCI
11.19
Type
journal article
Language
en
Open access
Locations
  • Gastroenterology (publishedVersion)
  • PubMed (publishedVersion)
  • IRIS UNIMORE (University of Modena and Reggio Emilia) (submittedVersion)
  • RWTH Publications (RWTH Aachen) (submittedVersion)
Topics
  • Health Sciences › Medicine › Hematology › Iron Metabolism and Disorders
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
  • Health Sciences › Nursing › Nutrition and Dietetics › Trace Elements in Health
Keywords
hepcidin, STAT3, interleukin-6, gp130, iron homeostasis, hepatocytes, SOCS3, serum amyloid A, RAS/MAPK pathway, liver, hypoferremia, primary hepatocytes
MeSH terms
Suppressor of Cytokine Signaling 3 Protein, Animals, Iron, Mice, Mutant Strains, Phosphorylation, RNA, Messenger, Transcription, Genetic, Signal Transduction, Interleukin-6, Hepatocytes, Antimicrobial Cationic Peptides, STAT3 Transcription Factor, Cytokine Receptor gp130, Suppressor of Cytokine Signaling Proteins, Mice, Hepcidins

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