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Molecular and Cellular Biology
Article . 2012 . Peer-reviewed
License: ASM Journals Non-Commercial TDM
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The Hypoxia-Inducible Factor–C/EBPα Axis Controls Ethanol-Mediated Hepcidin Repression

Authors: Erik R, Anderson; Matthew, Taylor; Xiang, Xue; Angelical, Martin; David S, Moons; M Bishr, Omary; Yatrik M, Shah;

The Hypoxia-Inducible Factor–C/EBPα Axis Controls Ethanol-Mediated Hepcidin Repression

Abstract

Hepcidin is a liver-derived peptide hormone and the master regulator of systemic iron homeostasis. Decreased hepcidin expression is a common feature in alcoholic liver disease (ALD) and in mouse models of ethanol loading. Dysregulation of hepcidin signaling in ALD leads to liver iron deposition, which is a major contributing factor to liver injury. The mechanism by which hepcidin is regulated following ethanol treatment is unclear. An increase in liver hypoxia was observed in an acute ethanol-induced liver injury model. The hypoxic response is controlled by a family of hypoxia-inducible transcription factors (HIFs), which are composed of an oxygen-regulated alpha subunit (HIFα) and a constitutively present beta subunit, aryl hydrocarbon receptor nuclear translocator (HIFβ/Arnt). Disruption of liver HIF function reversed the repression of hepcidin following ethanol loading. Mouse models of liver HIF overexpression demonstrated that both HIF-1α and HIF-2α contribute to hepcidin repression in vivo. Ethanol treatment led to a decrease in CCAAT-enhancer-binding protein alpha (C/EBPα) protein expression in a HIF-dependent manner. Importantly, adenoviral rescue of C/EBPα in vivo ablated the hepcidin repression in response to ethanol treatment or HIF overexpression. These data provide novel insight into the regulation of hepcidin by hypoxia and indicate that targeting HIFs in the liver could be therapeutic in ALD.

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Keywords

Ethanol, Down-Regulation, Smad Proteins, Hypoxia-Inducible Factor 1, alpha Subunit, Cell Line, Mice, Hepcidins, Liver, Basic Helix-Loop-Helix Transcription Factors, CCAAT-Enhancer-Binding Protein-alpha, Animals, Humans, Erythropoiesis, Hypoxia, Antimicrobial Cationic Peptides

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    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
38
Top 10%
Top 10%
Top 10%
bronze