Linked Life Data

12183449

Source:http://linkedlifedata.com/resource/pubmed/id/12183449

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
43
pubmed:dateCreated
2002-10-25
pubmed:abstractText
Originally identified as a gene up-regulated by iron overload in mouse liver, the HEPC gene encodes hepcidin, the first mammalian liver-specific antimicrobial peptide and potential key regulator of iron metabolism. Here we demonstrate that during rat liver development, amounts of HEPC transcripts were very low in fetal liver, strongly and transiently increased shortly after birth, and reappeared in adult liver. To gain insight into mechanisms that regulate hepatic expression of hepcidin, 5'-flanking regions of human and mouse HEPC genes were isolated and analyzed by functional and DNA binding assays. Human and mouse HEPC promoter-luciferase reporter vectors exhibited strong basal activity in hepatoma HuH-7 and mouse hepatocytes, respectively, but not in non-hepatic U-2OS cells. We found that CCAAT/enhancer-binding protein alpha (C/EBPalpha) and C/EBPbeta were respectively very potent and weak activators of both human and mouse promoters. In contrast, co-expression of hepatocyte nuclear factor 4alpha (HNF4alpha) failed to induce HEPC promoter activity. By electrophoretic mobility shift assay we demonstrated that one putative C/EBP element found in the human HEPC promoter (-250/-230) predominantly bound C/EBPalpha from rat liver nuclear extracts. Hepatic deletion of the C/EBPalpha gene resulted in reduced expression of HEPC transcripts in mouse liver. In contrast, amounts of HEPC transcripts increased in liver-specific HNF4alpha-null mice. Decrease of hepcidin mRNA in mice lacking hepatic C/EBPalpha was accompanied by iron accumulation in periportal hepatocytes. Finally, iron overload led to a significant increase of C/EBPalpha protein and HEPC transcripts in mouse liver. Taken together, these data demonstrate that C/EBPalpha is likely to be a key regulator of HEPC gene transcription and provide a novel mechanism for cross-talk between the C/EBP pathway and iron metabolism.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
25
pubmed:volume
277
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
41163-70
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed-meshheading:12183449-Animals, pubmed-meshheading:12183449-Anti-Bacterial Agents, pubmed-meshheading:12183449-Antimicrobial Cationic Peptides, pubmed-meshheading:12183449-Base Sequence, pubmed-meshheading:12183449-CCAAT-Enhancer-Binding Protein-alpha, pubmed-meshheading:12183449-DNA, pubmed-meshheading:12183449-Female, pubmed-meshheading:12183449-Gene Expression Regulation, pubmed-meshheading:12183449-Humans, pubmed-meshheading:12183449-Iron, pubmed-meshheading:12183449-Liver, pubmed-meshheading:12183449-Mice, pubmed-meshheading:12183449-Molecular Sequence Data, pubmed-meshheading:12183449-Promoter Regions, Genetic, pubmed-meshheading:12183449-RNA, Messenger, pubmed-meshheading:12183449-Rats, pubmed-meshheading:12183449-Rats, Sprague-Dawley, pubmed-meshheading:12183449-Transcription, Genetic
pubmed:year
2002
pubmed:articleTitle
C/EBPalpha regulates hepatic transcription of hepcidin, an antimicrobial peptide and regulator of iron metabolism. Cross-talk between C/EBP pathway and iron metabolism.
pubmed:affiliation
INSERM U522, CHRU Pontchaillou, 35033 Rennes Cedex, France.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't