Document Detail


Influx in vivo of low density, intermediate density, and very low density lipoproteins into aortic intimas of genetically hyperlipidemic rabbits. Roles of plasma concentrations, extent of aortic lesion, and lipoprotein particle size as determinants.
MedLine Citation:
PMID:  1731859     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
To compare the atherogenic potential of low density lipoprotein (LDL), intermediate density lipoprotein (IDL), and very low density lipoprotein (VLDL) under conditions where plasma levels of these lipoproteins are elevated, the influx of cholesterol in these lipoproteins into the aortic intima was measured in vivo in genetically hyperlipidemic rabbits from the St. Thomas's Hospital strain, an animal model that shares many of the features of the human disorder familial combined hyperlipidemia. Univariate linear regression showed that the arterial influx of LDL cholesterol (n = 25), IDL cholesterol (n = 14), and VLDL cholesterol (n = 10) was positively and linearly associated with plasma concentrations of LDL cholesterol in the range 0.2-6.4 mmol/l, of IDL cholesterol in the range 0.1-7.0 mmol/l, and of VLDL cholesterol in the range 0.7-8.5 mmol/l, respectively, and also with the extent of lesions in the arterial intima in the range 0-100% of the surface area. Multiple linear regression suggested that the arterial influx of LDL, IDL, and VLDL cholesterol was linearly dependent on plasma concentration, independent of lesion size. Furthermore, it appeared that the arterial influx of the three lipoproteins was linearly dependent on the extent of the lesions, independent of lipoprotein concentration. When influx was normalized for plasma concentration (intimal clearance) and for lesion size (compared within the same aorta), the intimal clearance of the larger IDL and VLDL particles was 15-35% less than that of the smaller LDL particles. These findings suggest that the quantitatively most important mechanism for transfer of plasma lipoproteins into the arterial intima involves nonspecific molecular sieving and that at elevated plasma levels, IDL and VLDL share with LDL the potential for causing atherosclerosis.
Authors:
B G Nordestgaard; A Tybjaerg-Hansen; B Lewis
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Arteriosclerosis and thrombosis : a journal of vascular biology / American Heart Association     Volume:  12     ISSN:  1049-8834     ISO Abbreviation:  Arterioscler. Thromb.     Publication Date:  1992 Jan 
Date Detail:
Created Date:  1992-02-27     Completed Date:  1992-02-27     Revised Date:  2010-08-25    
Medline Journal Info:
Nlm Unique ID:  9101388     Medline TA:  Arterioscler Thromb     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  6-18     Citation Subset:  IM    
Affiliation:
Department of Chemical Pathology and Metabolic Disorders, United Medical School, St. Thomas's Hospital, London, UK.
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MeSH Terms
Descriptor/Qualifier:
Animals
Aorta / metabolism*
Cholesterol / blood,  metabolism*
Cholesterol, LDL / blood,  metabolism*,  ultrastructure
Cholesterol, VLDL / blood,  metabolism*,  ultrastructure
Female
Hyperlipidemia, Familial Combined / metabolism*
Lipoproteins / blood,  metabolism*,  ultrastructure
Male
Microscopy, Electron
Rabbits
Regression Analysis
Grant Support
ID/Acronym/Agency:
//Wellcome Trust
Chemical
Reg. No./Substance:
0/Cholesterol, LDL; 0/Cholesterol, VLDL; 0/Lipoproteins; 0/lipoprotein cholesterol; 57-88-5/Cholesterol

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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