Document Detail


Cholesterol distribution in rat liver and brain mitochondria as determined by stopped-flow kinetics with filipin.
MedLine Citation:
PMID:  2321954     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Recently, analysis of protein distribution in rat brain mitochondria suggested the existence of distinct cholesterol domains in the outer membrane (Dorbani et al., 1987, Arch. Biochem. Biophys. 252, 188-196) while such domains were not detected in rat liver mitochondria (Jancsik et al., 1988, Arch. Biochem. Biophys. 264, 295-301). We studied cholesterol distribution in both types of mitochondria by analyzing the kinetics of filipin-cholesterol complex formation, using the stopped-flow technique. In liver mitochondria, the kinetics are characterized by a biphasic curve which presumably corresponds to the two membranes. This was confirmed by the finding that pretreatment with digitonin abolished one of the kinetic components. Sonication of the mitochondria increased the rate of the filipin-cholesterol complex formation and also abolished one of the two components. In the case of brain mitochondria, several distinct cholesterol domains could be revealed: one of them was cholesterol-free and it was directly accessible to filipin. Two other domains were revealed by differences found in the rate of the cholesterol-filipin complex formation. It is noteworthy that only a part of the cholesterol is accessible to filipin. Sonication of mitochondria decreased the proportion of cholesterol molecules accessible to filipin. This suggests specific interactions of cholesterol with other mitochondrial components, which occur only in brain mitochondria.
Authors:
G Crémel; D Filliol; V Jancsik; A Rendon
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Archives of biochemistry and biophysics     Volume:  278     ISSN:  0003-9861     ISO Abbreviation:  Arch. Biochem. Biophys.     Publication Date:  1990 Apr 
Date Detail:
Created Date:  1990-05-04     Completed Date:  1990-05-04     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  0372430     Medline TA:  Arch Biochem Biophys     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  142-7     Citation Subset:  IM    
Affiliation:
Centre de Neurochimie du CNRS, Strasbourg, France.
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MeSH Terms
Descriptor/Qualifier:
Animals
Antifungal Agents / diagnostic use*
Brain Chemistry*
Cholesterol / analysis*
Filipin / diagnostic use*
Intracellular Membranes / analysis*
Kinetics
Liposomes
Membrane Lipids / analysis*
Mitochondria / analysis*
Mitochondria, Liver / analysis*
Rats
Submitochondrial Particles / analysis*
Chemical
Reg. No./Substance:
0/Antifungal Agents; 0/Liposomes; 0/Membrane Lipids; 480-49-9/Filipin; 57-88-5/Cholesterol

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


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