Linked Life Data

15627500

Source:http://linkedlifedata.com/resource/pubmed/id/15627500

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2-3
pubmed:dateCreated
2005-1-3
pubmed:abstractText
The Brambell receptor (FcRB, FcRn) mediates transmission of immunity from mother to young perinatally and plays a central role in IgG protection and homeostasis throughout life. Developmental and tissue specific expression is via transcriptional regulation of the gene for the receptor heavy chain, Fcgrt. In neonatal mouse intestine, expression is high to absorb IgG from mother's milk, but then nearly absent in adult intestine and in most other tissues. In this initial functional characterization, reporter gene assays revealed at least two upstream promoter regions (-372/-140 and -105/-1), each with repressor and activator functions, and a downstream activator domain (+1/+78). The gene carries no upstream TATA element or Inr sequence, and an apparent downstream promoter feature (DPE) lacks typical context for an active element, rendering uncertain the nature of the organizing feature for the transcription initiation complex. Electrophoretic mobility shift analysis of the proximal upstream region identified transcription factor (TF) binding to motifs for NF1, Sp1 (GT box) and Ets. Binding to the GT box and Ets motif was observed only with mature cell sources, and not with neonatal enterocyte extracts. Site-directed mutagenesis confirmed that TF binding to the GT box up-regulates promoter activity in adult (NIH3T3) cells, whereas binding to the Ets motif represses activity. Binding of NF1 protein to the Fcgrt promoter was confirmed in nuclear extracts of NIH3T3 cells and in adult mouse enterocytes, whereas an apparently different TF bound uniquely to the NF1 site in neonatal enterocyte extracts as the sole identified candidate for an expected developmental-specific high-level activator in this tissue. These data indicate regions of potential importance in the Fcgrt proximal promoter and additionally suggest that the selective temporal and spatial availability of specific TFs may contribute to the developmental and tissue-specific regulation of Fcgrt expression.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0006-3002
pubmed:author
pubmed:issnType
Print
pubmed:day
11
pubmed:volume
1681
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
88-98
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
2005
pubmed:articleTitle
Functional analysis of the mouse Fcgrt 5' proximal promoter.
pubmed:affiliation
Biotherapeutics Development Lab, Harvard Institutes of Human Genetics and Division of Hematology and Oncology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.