Linked Life Data

6424717

Source:http://linkedlifedata.com/resource/pubmed/id/6424717

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1984-6-18
pubmed:abstractText
The rate of spontaneous transfer of alpha-tocopherol, cholesterol and beta-carotene between model and native lipoproteins was measured to determine the mechanism and kinetics of equilibration of these lipids in plasma. Cholesterol and alpha-tocopherol transfer from apolipoprotein A-I/1-palmityl-2- oleoylphosphatidylcholine ( POPC ) recombinants to bovine brain ganglioside/ POPC single bilage vesicles with half-times of approximately 20 min and 70 min, respectively. Under identical conditions, there is no significant transfer of beta-carotene even after an 18-h incubation period. alpha-Tocopherol transfers from apolipoprotein A-II/dimyristoylphosphatidylcholine recombinants with a half-time of 40 min and an activation energy of 17.2 kcal/mol. Incubation of high-density lipoproteins containing alpha-[3H]tocopherol with low-density lipoproteins or very-low-density lipoproteins results in the equilibration of the labelled lipid between the lipoprotein classes in 1 h. A comparison of the rates of transfer indicates that alpha-tocopherol equilibrates 2-3-times more slowly than cholesterol but on a time scale much shorter than the lifetime of lipoproteins in the circulation. Thus, the distribution of alpha-tocopherol is not kinetically controlled but determined thermodynamically by the partitioning between the total amount of lipid in each compartment. The spontaneous transfer of beta-carotene is too slow for this equilibration to occur.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0006-3002
pubmed:author
pubmed:issnType
Print
pubmed:day
11
pubmed:volume
793
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
387-92
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1984
pubmed:articleTitle
Kinetics of transfer of alpha-tocopherol between model and native plasma lipoproteins.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't