Linked Life Data

2373956

Source:http://linkedlifedata.com/resource/pubmed/id/2373956

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
1990-8-27
pubmed:abstractText
Cholesterol, despite its poor solubility in aqueous solutions, exchanges efficiently between membranes. Movement of cholesterol between different subcellular membranes in the hepatocyte is necessary for assembly of lipoproteins, biliary cholesterol secretion, and bile acid synthesis. Factors which initiate and facilitate transfer of cholesterol between different membranes in the hepatocyte are incompletely understood. It is known that cholesterol secretion into the bile is linked to bile salt secretion. In the present study, we investigated the effects of bile salts of different physicochemical properties at submicellar concentrations (150- 600 microM) on the transfer of [14C]cholesterol from hepatocytes, or crude hepatocellular membranes (donors), to rat high density lipoproteins (acceptor). Bile salts included taurine conjugates of ursodeoxycholic acid (TUDCA), hyodeoxycholic acid (THDCA), cholic acid (TCA), chenodeoxycholic acid (TCDCA), and deoxycholic acid (TDCA). High density lipoprotein (HDL) was separated from hepatocellular membranes and the transfer of [14C]cholesterol from the membranes to HDL was quantitatively determined. In the absence of HDL, [14C]cholesterol remained confined to the membrane fraction. Following addition of HDL, [4-14C]cholesterol in the HDL fraction increased linearly over time. Addition of hydrophilic bile salts (TUDCA and THDCA) increased transfer of [4-14C]cholesterol to HDL only minimally. By contrast, more hydrophobic bile salts stimulated transfer of labeled cholesterol to HDL, and their potency increased in order of increasing hydrophobicity (TCA less than TCDCA less than TDCA). Both for single bile salts and mixtures of bile salts at a total bile salt concentration of 0.30 mM, the rate of cholesterol transfer exhibited a strong linear correlation with a bile salt monomeric hydrophobicity index (r = 0.95; P less than 0.001).(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0022-2275
pubmed:author
pubmed:issnType
Print
pubmed:volume
31
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1063-71
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1990
pubmed:articleTitle
Bile salts in submicellar concentrations promote bidirectional cholesterol transfer (exchange) as a function of their hydrophobicity.
pubmed:affiliation
Department of Medicine, (Division of Gastroenterology), Medical College of Virginia, Richmond 23298.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Non-P.H.S.