Linked Life Data

10064727

Source:http://linkedlifedata.com/resource/pubmed/id/10064727

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1999-4-13
pubmed:abstractText
Foam cells formed from receptor-mediated uptake of lipoprotein cholesterol by macrophages in the arterial intima are critical in the initiation, progression, and stability of atherosclerotic lesions. Macrophages accumulate cholesterol when conditions favor esterification by acyl-CoA:cholesterol acyltransferase (ACAT) over cholesteryl-ester hydrolysis by a neutral cholesteryl-ester hydrolase, such as hormone-sensitive lipase (HSL), and subsequent cholesterol efflux mediated by extracellular acceptors. We recently made stable transfectants of a murine macrophage cell line, RAW 264.7, that overexpressed a rat HSL cDNA and had a 5-fold higher rate of cholesteryl-ester hydrolysis than control cells. The current study examined the effect of macrophage-specific HSL overexpression on susceptibility to diet-induced atherosclerosis in mice. A transgenic line overexpressing the rat HSL cDNA regulated with a macrophage-specific scavenger receptor promoter-enhancer was established by breeding with C57BL/6J mice. Transgenic peritoneal macrophages exhibited macrophage-specific 7-fold overexpression of HSL cholesterol esterase activity. Total plasma cholesterol levels in transgenic mice fed a chow diet were modestly elevated 16% compared to control littermates. After 14 weeks on a high-fat, high-cholesterol diet, total cholesterol increased 3-fold, with no difference between transgenics and controls. However, HSL overexpression resulted in thicker aortic fatty lesions that were 2.5-times larger in transgenic mice. HSL expression in the aortic lesions was shown by immunocytochemistry. Atherosclerosis was more advanced in transgenic mice exhibiting raised lesions involving the aortic wall, along with lipid accumulation in coronary arteries occurring only in transgenics. Thus, increasing cholesteryl-ester hydrolysis, without concomitantly decreasing ACAT activity or increasing cholesterol efflux, is not sufficient to protect against atherosclerosis. hormone-sensitive lipase overexpression in macrophages.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0022-2275
pubmed:author
pubmed:issnType
Print
pubmed:volume
40
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
397-404
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed-meshheading:10064727-Animals, pubmed-meshheading:10064727-Aorta, pubmed-meshheading:10064727-Arteriosclerosis, pubmed-meshheading:10064727-Cell Line, pubmed-meshheading:10064727-Cholesterol, pubmed-meshheading:10064727-Cholesterol Esters, pubmed-meshheading:10064727-Diet, Atherogenic, pubmed-meshheading:10064727-Enhancer Elements, Genetic, pubmed-meshheading:10064727-Female, pubmed-meshheading:10064727-Gene Expression Regulation, pubmed-meshheading:10064727-Macrophages, Peritoneal, pubmed-meshheading:10064727-Membrane Proteins, pubmed-meshheading:10064727-Mice, pubmed-meshheading:10064727-Mice, Transgenic, pubmed-meshheading:10064727-Promoter Regions, Genetic, pubmed-meshheading:10064727-Rats, pubmed-meshheading:10064727-Receptors, Immunologic, pubmed-meshheading:10064727-Receptors, Lipoprotein, pubmed-meshheading:10064727-Receptors, Scavenger, pubmed-meshheading:10064727-Scavenger Receptors, Class B, pubmed-meshheading:10064727-Sterol Esterase, pubmed-meshheading:10064727-Transfection
pubmed:year
1999
pubmed:articleTitle
Paradoxical effect on atherosclerosis of hormone-sensitive lipase overexpression in macrophages.
pubmed:affiliation
Lipid Research Laboratory, West Los Angeles VA Medical Center, Los Angeles, CA 90073, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't