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Zumerle, Sara; Jacques Mathieu, R.R.; Delga, Stéphanie; Heinis, Mylène; Viatte, Lydie; Vaulont, Sophie; Peyssonnaux, Carole
Blood, 06/2014, Volume: 123, Issue: 23Journal Article
Hepcidin is a 25-amino-acid peptide demonstrated to be the iron regulatory hormone capable of blocking iron absorption from the duodenum and iron release from macrophages. Mutations affecting hepcidin regulators or the hepcidin gene itself cause hemochromatosis, a common genetic disorder. Hepcidin is produced mainly by the liver, but many cells and tissues express low levels of the hormone. To determine the contribution of these hepcidin-producing tissues in body iron homeostasis, we have developed a new mouse model in which the hepcidin gene can be conditionally inactivated. Here we compare a liver-specific knockout (KO) mouse model with total KO mice. We show that the liver-specific KO mice fully recapitulate the severe iron overload phenotype observed in the total KO mice, with increased plasma iron and massive parenchymal iron accumulation. This result demonstrates that the hepatocyte constitutes the predominant reservoir for systemic hepcidin and that the other tissues are unable to compensate. •Liver-specific hepcidin KO mice fully recapitulate the severe iron overload phenotype observed in the total KO mice.•The hepcidin produced by hepatocytes is the main regulator of body iron homeostasis.
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