Linked Life Data

15840840

Source:http://linkedlifedata.com/resource/pubmed/id/15840840

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2005-6-16
pubmed:abstractText
Organic anion transporting polypeptides (Oatp) mediate the transport of a wide variety of amphipathic organic substrates. Rat Oatp1b2 and human OATP1B3 are members of a liver-specific subfamily of Oatps/OATPs. We investigated whether prolactin (PRL) and growth hormone (GH) regulated Oatp1b2 and OATP1B3 gene expression via signal transducers and activators of transcription 5 (Stat5). Binding sites for Stat5 transcription factors were located in the promoters of Oatp1b2 and OATP1B3 at -209 to -201 (5'-TTCTGGGAA-3') and -170 to -162 (5'-TTCTGAGAA-3'), respectively. In primary hepatocytes from female and male rats treated with PRL or GH, Oatp1b2 mRNA measured by real-time polymerase chain reaction was significantly induced 2-fold. HepG2 cells were transiently transfected with expression vectors containing Oatp1b2 or OATP1B3 promoter fragments, cDNAs for Stat5a, and the receptors for PRL (PRLR(L)) or GH (GHR), and treated with PRL or GH. PRL and GH induction of Oatp1b2 and OATP1B3 promoter activity required cotransfection of Stat5a and PRLR(L) or GHR. Mutation of the Stat5 binding site in both promoters eliminated hormonal induction. In DNA binding assays, HepG2 cells transfected with cDNAs for Stat5a and PRLR(L) were treated with PRL, and nuclear extracts were probed with a (32)P-labeled oligomer corresponding to -177 to -157 of the OATP1B3 promoter. PRL enhanced the binding of Stat5a to the OATP1B3 promoter and DNA-protein binding was inhibited in competition assays by excess OATP1B3 and Stat5 consensus oligomers but not by mutant Stat5 oligomers. These findings indicate that PRL and GH can regulate Oatp1b2 and OATP1B3 gene expression via the Stat5 signal-transduction pathway.
pubmed:grant
pubmed:commentsCorrections
http://linkedlifedata.com/resource/pubmed/commentcorrection/15840840-10873595, http://linkedlifedata.com/resource/pubmed/commentcorrection/15840840-11159893, http://linkedlifedata.com/resource/pubmed/commentcorrection/15840840-11248085, http://linkedlifedata.com/resource/pubmed/commentcorrection/15840840-11248086, http://linkedlifedata.com/resource/pubmed/commentcorrection/15840840-11483603, http://linkedlifedata.com/resource/pubmed/commentcorrection/15840840-11564677, http://linkedlifedata.com/resource/pubmed/commentcorrection/15840840-11961056, http://linkedlifedata.com/resource/pubmed/commentcorrection/15840840-12055601, http://linkedlifedata.com/resource/pubmed/commentcorrection/15840840-12507753, http://linkedlifedata.com/resource/pubmed/commentcorrection/15840840-12933675, http://linkedlifedata.com/resource/pubmed/commentcorrection/15840840-8621467, http://linkedlifedata.com/resource/pubmed/commentcorrection/15840840-8737372, http://linkedlifedata.com/resource/pubmed/commentcorrection/15840840-8791809, http://linkedlifedata.com/resource/pubmed/commentcorrection/15840840-9185514
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0026-895X
pubmed:author
pubmed:issnType
Print
pubmed:volume
68
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
218-25
pubmed:dateRevised
2011-6-13
pubmed:meshHeading
pubmed:year
2005
pubmed:articleTitle
Hormonal regulation of hepatic organic anion transporting polypeptides.
pubmed:affiliation
Graduate Center for Toxicology, 306 Health Sciences Research Building, University of Kentucky, Lexington, KY 40536-0305, USA.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S., Research Support, N.I.H., Extramural