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Blood, 15 September 2005, Vol. 106, No. 6, pp. 2196-2199. Prepublished online as a Blood First Edition Paper on June 2, 2005; DOI 10.1182/blood-2005-04-1766. This Article Full Text Full Text (PDF) All Versions of this Article: 2005-04-1766v1 106/6/2196    most recent Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Rights and Permissions Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Rivera, S. Articles by Ganz, T. Search for Related Content PubMed PubMed Citation Articles by Rivera, S. Articles by Ganz, T. Related Collections Red Cells Related Article in Blood Online Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  RED CELLS Synthetic hepcidin causes rapid dose-dependent hypoferremia and is concentrated in ferroportin-containing organs Seth Rivera, Elizabeta Nemeth, Victoria Gabayan, Miguel A. Lopez, Dina Farshidi, and Tomas Ganz From the Departments of Medicine and Pathology, David Geffen School of Medicine at the University of California Los Angeles (UCLA), CA. Hepcidin is the principal iron regulatory hormone and its overproduction contributes to anemia of inflammation (AI). In vitro, hepcidin binds to and induces the degradation of the exclusive iron exporter ferroportin. We explored the effects and distribution of synthetic hepcidin in the mouse. A single intraperitoneal injection of hepcidin caused a rapid fall of serum iron in a dose-dependent manner, with a 50-µg dose resulting in iron levels 80% lower than in control mice. The full effect was seen within only 1 hour, consistent with a blockade of iron export from tissue stores and from macrophages involved in iron recycling. Serum iron remained suppressed for more than 48 hours after injection. Using radiolabeled hepcidin, we demonstrated that the serum concentration of hepcidin at the 50-µg dose was 1.4 µM, consistent with the inhibitory concentration of 50% (IC50) of hepcidin measured in vitro. Radiolabeled hepcidin accumulated in the ferroportin-rich organs, liver, spleen, and proximal duodenum. Our study highlights the central role of the hepcidin-ferroportin interaction in iron homeostasis. The rapid and sustained action of a single dose of hepcidin makes it an appealing agent for the prevention of iron accumulation in hereditary hemochromatosis. 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