Linked Life Data

8420942

Source:http://linkedlifedata.com/resource/pubmed/id/8420942

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1993-2-18
pubmed:abstractText
High density lipoprotein (HDL) cholesterol ester (CE) is taken up by many cells without simultaneous uptake of HDL apoprotein. The studies described herein demonstrate that the selective uptake of cholesterol ester by HepG2 cells is reduced by antibody directed against the receptor-binding domain of apoE (monoclonal antibody (mAb) 1D7) but not by antibody directed against the NH2-terminal portion of the molecule. The reduction, by 1D7, of HDL cholesteryl ester uptake is not due to apoE acquisition by the labeled HDL preparation or by the transfer of [3H]CE of HDL to apoE-containing lipoproteins and uptake by the apoB/E or apoE receptors. Rather, it appears that mAb 1D7 recognizes apoE localized at the cell surface of HepG2 cells. This conclusion is supported by the fact that: 1) reduction of HDL-CE uptake by HepG2 cells is observed within 15 min after the addition of the antibody-ligand mixture; 2) 1D7 is similarly effective in reducing the selective uptake of HDL-CE when added to the ligand or to the cells; 3) three different anti-apoE mAbs (1D7, 3B7, and 3H1) bind specifically to the surface of the cells. We have also demonstrated that heparin (5 mg/ml) does not reduce the amount of apoE-immunoreactive material bound at the cell surface when added before or after the binding period. 1D7, but not 3B7 or 3H1, binds less in the presence of heparin. The observations are consistent with a localization of apoE on the cell membrane rather than on lipoproteins bound to apoB/E or apoE receptors.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
25
pubmed:volume
268
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1670-6
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1993
pubmed:articleTitle
Uptake of high density lipoprotein cholesterol ester by HepG2 cells involves apolipoprotein E localized on the cell surface.
pubmed:affiliation
Laboratory of Lipoprotein Metabolism, Clinical Research Institute of Montreal, Quebec, Canada.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't