Linked Life Data

7864127

Source:http://linkedlifedata.com/resource/pubmed/id/7864127

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2 Pt 1
pubmed:dateCreated
1995-3-21
pubmed:abstractText
The effect of bile acids on adenosine 3',5'-cyclic monophosphate (cAMP) synthesis was investigated in isolated hamster hepatocytes. Bile acids had no direct effect on cAMP production. However, ursodeoxycholic acid (UDCA) and tauroursodeoxycholic acid inhibited, by approximately 45%, cAMP formation induced by concentrations of glucagon greater than 1 nM, with a respective half-maximum inhibitory effect observed at 4 +/- 2 microM. Similar inhibition was observed with phorbol 12-myristate 13-acetate (PMA). Chenodeoxycholic, murocholic, and taurodeoxycholic acids were the next most potent bile acids. Taurolithocholic acid was 100-fold less potent than UDCA, whereas both ursocholic and taurocholic acids had no effect at concentrations up to 0.5 mM. Neither bile acids nor PMA affected either the binding of glucagon to its receptor, the cAMP-dependent phosphodiesterase, adenylate cyclase, or the inhibitory and stimulatory (Gs) GTP-binding proteins. The inhibitory effect of PMA and UDCA on glucagon-induced cAMP synthesis was abolished in the presence of the protein kinase C (PKC) inhibitor, staurosporine. Furthermore, UDCA induced PKC translocation from cytosol to membrane and stimulated phosphorylation of an 80-kDa protein substrate for PKC. In conclusion, mediated by PKC activation, bile acids inhibit glucagon-induced cAMP synthesis by uncoupling the glucagon receptor and Gs.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0002-9513
pubmed:author
pubmed:issnType
Print
pubmed:volume
268
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
G300-10
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1995
pubmed:articleTitle
Ursodeoxycholic acid inhibits glucagon-induced cAMP formation in hamster hepatocytes: a role for PKC.
pubmed:affiliation
Department of Medicine, George Washington University Medical Center, Washington, District of Columbia 20037.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S.