Document Detail


Cellular cholesteryl ester clearance. Relationship to the physical state of cholesteryl ester inclusions.
MedLine Citation:
PMID:  6643434     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The hypothesis that clearance of cellular cholesteryl ester deposits may be a function of the physical state of the stored lipid has been investigated. Cultured rat hepatoma cells were induced to store cholesteryl ester in either anisotropic inclusions by exposure to free cholesterol-rich phospholipid dispersions or isotropic inclusions by exposure to identical dispersions supplemented with oleic acid. Differential scanning calorimetry demonstrated an order/disorder transition at 43 degrees C for cholesteryl esters stored in anisotropic inclusions; the enthalpy of this transition was consistent with a smectic liquid crystalline to liquid transition. Lipids in cells with isotropic inclusions displayed no order/disorder transitions over the range 20-80 degrees C, indicating that the lipids are in a liquid state. The presence of oleic acid did not influence the mass of cholesteryl ester stored but increased the amount of stored triglyceride. Fatty acyl compositions of the cholesteryl esters were different under the two loading conditions; in particular, there was 38% cholesteryl oleate in anisotropic inclusions and 65% cholesteryl oleate in isotropic inclusions. Kinetics of cholesteryl ester clearance from cells with either anisotropic or isotropic inclusions were studied during a 12-h exposure to acceptors of free cholesterol. In both cases, cholesteryl ester clearance is essentially linear over 12 h and is directly proportional to the initial content of cholesteryl ester. However, the fraction of initial content of cholesteryl ester cleared in 12 h is 0.17 +/- 0.05 for cells with anisotropic inclusions and 0.34 +/- 0.09 for cells with isotropic inclusions. Our data demonstrate that the more rapid clearance of cholesteryl ester by cells with isotropic inclusions can be correlated with the physical state of the cholesteryl ester.
Authors:
J M Glick; S J Adelman; M C Phillips; G H Rothblat
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The Journal of biological chemistry     Volume:  258     ISSN:  0021-9258     ISO Abbreviation:  J. Biol. Chem.     Publication Date:  1983 Nov 
Date Detail:
Created Date:  1984-01-07     Completed Date:  1984-01-07     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  2985121R     Medline TA:  J Biol Chem     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  13425-30     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Calorimetry, Differential Scanning
Cell Line
Cholesterol / metabolism
Cholesterol Esters / metabolism*
Kinetics
Liposomes
Liver Neoplasms, Experimental / metabolism
Phosphatidylcholines / metabolism
Phospholipids / metabolism
Proteins / metabolism
Rats
Grant Support
ID/Acronym/Agency:
HL22633/HL/NHLBI NIH HHS; HL25938/HL/NHLBI NIH HHS
Chemical
Reg. No./Substance:
0/Cholesterol Esters; 0/Liposomes; 0/Phosphatidylcholines; 0/Phospholipids; 0/Proteins; 57-88-5/Cholesterol

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


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