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J. Biol. Chem., Vol. 276, Issue 11, 7811-7819, March 16, 2001
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§,
,
,
,
¶,
, and
From the Considering that the development of
hepatic lesions related to iron overload diseases might be a result of
abnormally expressed hepatic genes, we searched for new genes
up-regulated under the condition of iron excess. By suppressive
subtractive hybridization performed between livers from carbonyl
iron-overloaded and control mice, we isolated a 225-base pair cDNA.
By Northern blot analysis, the corresponding mRNA was confirmed to
be overexpressed in livers of experimentally (carbonyl iron and
iron-dextran-treated mice) and spontaneously
(
INSERM U522, CHRU Pontchaillou, Rennes,
¶ Laboratoire d'Anatomo-Pathologie B, CHRU Pontchaillou, Rennes,
and
Service des Maladies du Foie, CHRU Pontchaillou,
35033 Rennes, France
2-microglobulin knockout mice) iron-overloaded mice. In addition,
2-microglobulin knockout mice fed
with a low iron content diet exhibited a decrease of hepatic mRNA
expression. The murine full-length cDNA was isolated and was found
to encode an 83-amino acid protein presenting a strong homology in its
C-terminal region to the human antimicrobial peptide hepcidin. In
addition, we cloned the corresponding rat and human orthologue
cDNAs. Both mouse and human genes named HEPC are
constituted of 3 exons and 2 introns and are located on chromosome 7 and 19, respectively, in close proximity to
USF2 gene. In mouse and human, HEPC mRNA was predominantly expressed in the liver. During both in
vivo and in vitro studies, HEPC mRNA expression
was enhanced in mouse hepatocytes under the effect of
lipopolysaccharide. Finally, to analyze the intracellular localization
of the predicted protein, we used the green fluorescent protein chimera
expression vectors. The murine green fluorescent protein-prohepcidin
protein was exclusively localized in the nucleus. When the putative
nuclear localization signal was deleted, the resulting protein was
addressed to the cytoplasm. Taken together, our data strongly suggest
that the product of the new liver-specific gene HEPC
might play a specific role during iron overload and exhibit additional
functions distinct from its antimicrobial activity.
The nucleotide sequence(s) reported in this paper has been submitted to the GenBankTM/EMBL Data Bank with accession number(s) AF297664, AF309489, and AF344185.
§ To whom correspondence should be addressed: INSERM U522, CHRU Pontchaillou, 35033 Rennes Cedex, France. Tel.: 33 299543737; Fax: 33 299540137; E-mail: christelle.pigeon@rennes.inserm.fr.This article has been cited by other articles:
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