Linked Life Data

226637

Source:http://linkedlifedata.com/resource/pubmed/id/226637

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1979-12-27
pubmed:abstractText
Apolipoprotein B transports cholesterol in plasma as low density lipoprotein (LDL) and targets its delivery to cells by binding to a specific plasma membrane receptor. The cellular consequences of apoB binding to its receptor were investigated to determine whether it suppresses cholesterol biosynthesis and reduces the number of cellular receptors for the apoprotein. Upon preincubation of fibroblasts with lipoprotein-deficient medium alone or supplemented with either LDL or apoB complexed to BSA (apoB-BSA), LDL suppressed cholesterol biosynthesis, but apoB enhanced it. Similarly, fibroblasts preincubated in medium supplemented with LDL bound decreased amounts of either (125)I-labeled LDL or (125)I-labeled apoB-BSA to their receptors, while preincubation with apoB-BSA increased the binding relative to the controls. These latter results occurred in association with a decrease in cellular cholesterol content, indicating that apoB in the medium bound cholesterol and removed it from the cells, thus stimulating both cholesterol synthesis and cellular binding of apoB. Accordingly, fibroblast cholesterol synthesis and the number of functional LDL receptors are not suppressed by the binding of the apoprotein to the receptor, and the known role of apoB remains that of transporting cholesterol in plasma and delivering it to the cell. A possible physiologic role for apoB in depleting cells of cholesterol is presently unknown since apoB is not known to exist free in plasma; however, these findings demonstrate such a functional capability for this apoprotein.-Shireman, R. B., and W. R. Fisher. Apolipoprotein B: its role in the control of fibroblast cholesterol biosynthesis and in the regulation of its own binding to cellular receptors.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0022-2275
pubmed:author
pubmed:issnType
Print
pubmed:volume
20
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
594-8
pubmed:dateRevised
2007-3-23
pubmed:meshHeading
pubmed:year
1979
pubmed:articleTitle
Apolipoprotein B: its role in the control of fibroblast cholesterol biosynthesis and in the regulation of its own binding to cellular receptors.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.