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C/EBPα Regulates Hepatic Transcription of Hepcidin, an Antimicrobial Peptide and Regulator of Iron Metabolism
Open accessAbstract
Originally identified as a gene up-regulated by iron overload in mouse liver, the HEPC gene encodes hepcidin, the first mammalian liver-specific antimicrobial peptide and potential key regulator of iron metabolism. Here we demonstrate that during rat liver development, amounts of HEPC transcripts were very low in fetal liver, strongly and transiently increased shortly after birth, and reappeared in adult liver. To gain insight into mechanisms that regulate hepatic expression of hepcidin, 5'-flanking regions of human and mouse HEPC genes were isolated and analyzed by functional and DNA binding assays. Human and mouse HEPC promoter-luciferase reporter vectors exhibited strong basal activity in hepatoma HuH-7 and mouse hepatocytes, respectively, but not in non-hepatic U-2OS cells. We found that CCAAT/enhancer-binding protein alpha (C/EBPalpha) and C/EBPbeta were respectively very potent and weak activators of both human and mouse promoters. In contrast, co-expression of hepatocyte nuclear factor 4alpha (HNF4alpha) failed to induce HEPC promoter activity. By electrophoretic mobility shift assay we demonstrated that one putative C/EBP element found in the human HEPC promoter (-250/-230) predominantly bound C/EBPalpha from rat liver nuclear extracts. Hepatic deletion of the C/EBPalpha gene resulted in reduced expression of HEPC transcripts in mouse liver. In contrast, amounts of HEPC transcripts increased in liver-specific HNF4alpha-null mice. Decrease of hepcidin mRNA in mice lacking hepatic C/EBPalpha was accompanied by iron accumulation in periportal hepatocytes. Finally, iron overload led to a significant increase of C/EBPalpha protein and HEPC transcripts in mouse liver. Taken together, these data demonstrate that C/EBPalpha is likely to be a key regulator of HEPC gene transcription and provide a novel mechanism for cross-talk between the C/EBP pathway and iron metabolism.
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“when HeLa cells stably transfected with tetracycline-inducible ferritin H and L were forced to overexpress ferritin, the accumulation of H2O2-induced ROS was reduced (59).”
From Intracellular iron transport and storage: from molecular mechanisms to health implications (2008) · cites this paper as [59]
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“Accumulating evidence shows that ferritin acts as an antioxidant protein (59, 60, 78, 159, 227, 243).”
From Intracellular iron transport and storage: from molecular mechanisms to health implications (2008) · cites this paper as [59]
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“overexpression or knockdown of ferritin expression in mammalian cells has proven the cytoprotective role of ferritin under prooxidative conditions (59, 60, 78, 159, 227, 243).”
From Intracellular iron transport and storage: from molecular mechanisms to health implications (2008) · cites this paper as [59]
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Metadata
- Authors
- Courselaud, B., Pigeon, C., Inoue, Y., Inoue, J., Gonzalez, F. J., Leroyer, P., Gilot, D., Boudjema, K., Guguen-Guillouzo, C., Brissot, P., Loréal, O., & Ilyin, G.
- Affiliations
- Inserm (FR)
- National Institutes of Health (US)
- Corresponding author
- Ilyin, Gennady
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 2002-10
- Volume
- 277
- Issue
- 43
- Pages
- 41163-41170
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W2172197126
- Cited by
- 245
- References
- 40
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 3 · 2023: 1 · 2022: 3 · 2021: 3 · 2020: 3 · 2019: 6 · 2018: 7 · 2017: 3 · 2016: 6 · 2015: 14 · 2014: 7 · 2013: 21 · 2012: 14
- FWCI
- 6.60
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Biological Chemistry (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Funders
- Ligue Contre le Cancer
- Topics
- Health Sciences › Medicine › Hematology › Iron Metabolism and Disorders
- Health Sciences › Nursing › Nutrition and Dietetics › Trace Elements in Health
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
- Keywords
- hepcidin, C/EBPα, C/EBPβ, HNF4α, iron metabolism, liver development, transcriptional regulation, promoter analysis, iron overload, iron accumulation, hepatocytes, antimicrobial peptides
- MeSH terms
- Animals, Anti-Bacterial Agents, Base Sequence, DNA, Female, Gene Expression Regulation, Humans, Iron, Liver, Molecular Sequence Data, Promoter Regions, Genetic, RNA, Messenger, Transcription, Genetic, Rats, Sprague-Dawley, CCAAT-Enhancer-Binding Protein-alpha, Antimicrobial Cationic Peptides, Mice, Rats, Hepcidins
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