Linked Life Data

15796896

Source:http://linkedlifedata.com/resource/pubmed/id/15796896

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2005-3-30
pubmed:abstractText
A great number of nuclear factors are involved in the negative feedback mechanism regulating bile acid synthesis. There are two major ways for the negative feedback to effect the synthesis; the SHP-dependent, involving FXR, and the SHP-independent way, affecting HNF-4alpha. We studied 23 patients with gallstone disease. Eight patients were treated with chenodeoxycholic acid, 7 with cholestyramine prior to operation, and 8 served as controls. Liver biopsies were analyzed with Real-time-PCR. In the cholestyramine-treated group mRNA levels of CYP7A1 were increased about 10-fold. Treatment with CDCA decreased the mRNA levels of CYP7A1 by about 70%. The mRNA levels of CYP8B1, CYP27A1, and CYP7B1 were not significantly altered in the treated groups. The analysis of mRNA levels for HNF-4alpha showed 64% higher levels in the cholestyramine-treated group compared to the controls. These levels showed positive and highly significant correlation to the levels of mRNA of CYP7A1 when studied in all three groups together. FXR, SHP, and LRH-1/FTF were not significantly affected by the different treatments. Our results indicate that when bile acid synthesis is upregulated by cholestyramine treatment the SHP-independent pathway for controlling CYP7A1 transcription dominates over the SHP-dependent pathway.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0006-291X
pubmed:author
pubmed:issnType
Print
pubmed:day
6
pubmed:volume
330
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
395-9
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2005
pubmed:articleTitle
Feedback regulation of bile acid synthesis in human liver: importance of HNF-4alpha for regulation of CYP7A1.
pubmed:affiliation
Department of Medicine, Division of Gastroenterology and Hepatology, Karolinska Institute K63, Karolinska University Hospital Huddinge, S-14186 Stockholm, Sweden. anna.abrahamsson@karolinska.se
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't