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Blood, 15 August 2006, Vol. 108, No. 4, pp. 1402-1405.
Prepublished online as a Blood First Edition Paper on March 30, 2006; DOI 10.1182/blood-2006-02-003376.
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Submitted February 10, 2006
Accepted March 14, 2006
Targeted disruption of the hepcidin1 gene results in severe hemochromatosis
Jeanne-Claire Lesbordes-Brion, Lydie Viatte, Myriam Bennoun, Dan-Qing Lou, Guillemette Ramey, Christophe Houbron, Ghislaine Hamard, Axel Kahn, and Sophie Vaulont*
Institut Cochin, Departement d' Endocrinologie, Metabolisme et Cancer, Paris
* Corresponding author; email: vaulont{at}cochin.inserm.fr.
We previously reported that mice made deficient for the transcriptional factor USF2 fail to express hepcidin1 and hepcidin2 genes as a consequence of targeted disruption of the Usf2 gene lying just upstream in the locus. These mice developed an iron overload phenotype with excess iron deposition in parenchymal cells and decreased reticuloendothelial iron. At that time, although the role of USF2 was still confounding, we proposed for the first time the role of hepcidin as a negative regulator of iron absorption and iron release from macrophages. Accordingly, we subsequently demonstrated that hyperexpression of hepcidin1, but not hepcidin2, resulted in a profound hyposideremic anemia. To analyze the consequences of hepcidin1 deletion on iron metabolism without any disturbance due to USF2 deficiency, we disrupted the hepcidin1 gene by targeting almost all the coding region. Confirming our prior results, Hepc1-/- mice developed early and severe multivisceral iron overload, with sparing of the spleen macrophages, and demonstrated increased serum iron and ferritin levels as compared to their controls.

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