Document Detail

Comparative lipid analysis of purified plasma membranes and shed extracellular membrane vesicles from normal murine thymocytes and leukemic GRSL cells.
MedLine Citation:
PMID:  7104337     Owner:  NLM     Status:  MEDLINE    
The lipid fluidity in purified plasma membranes (PM) of murine leukemic GRSL cells, as measured by fluorescence polarization, is much higher than in PM of normal thymocytes. This was found to be due to relatively low contents of cholesterol and sphingomyelin and a high amount of unsaturated fatty acyl chains, especially linoleic acid, in the phospholipids. PM from GRSL cells contain markedly more phosphatidylethanolamine than those from thymocytes. For both GRSL cells and thymocytes the detailed lipid composition of isolated PM was compared with that of the corresponding shed extracellular membranes (ECM), which were isolated from the ascites fluid and from thymus cell suspensions, respectively. The somewhat decreased lipid fluidity of thymocyte ECM as compared to their PM, can be ascribed to the increased cholesterol/phospholipid molar ratio (0.88 vs. 0.74). No other major differences were found between the lipid composition of these membranes. In contrast, significant differences were found between PM and ECM from GRSL cells. In this system a much lower lipid fluidity of the shed ECM was found, due to the much increased cholesterol/phospholipid molar ratio (3.5-fold) and sphingomyelin (9-fold) content, as compared to the PM. Further, the ECM contain relatively more lysophosphatidylethanolamine and less phosphatidylcholine and -inositol. ECM contain a higher amount of polyunsaturated fatty acids, especially in the phosphatidylethanolamine and lysophosphatidylethanolamine classes. On the other hand, the fatty acids of phosphatidylcholine and lysophosphatidylcholine are more saturated than in PM. In particular, ECM of GRSL cells contain less oleic and linoleic acid residues and more arachidonic acid and 22:polyunsaturated fatty acid residues than PM. The possible relevance of these differences with respect to the mechanism of shedding of vesicles from the cell surface, is discussed.
W J Van Blitterswijk; G De Veer; J H Krol; P Emmelot
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Biochimica et biophysica acta     Volume:  688     ISSN:  0006-3002     ISO Abbreviation:  Biochim. Biophys. Acta     Publication Date:  1982 Jun 
Date Detail:
Created Date:  1982-10-21     Completed Date:  1982-10-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0217513     Medline TA:  Biochim Biophys Acta     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  495-504     Citation Subset:  IM    
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MeSH Terms
Cell Membrane / analysis*
Cholesterol / analysis
Leukemia, Experimental / analysis*
Lymphocytes / analysis*
Membrane Fluidity
Membrane Lipids / analysis*
Mice, Inbred Strains
Phospholipids / analysis*
Spectrometry, Fluorescence
Thymus Gland / analysis
Reg. No./Substance:
0/Membrane Lipids; 0/Phospholipids; 1720-32-7/Diphenylhexatriene; 57-88-5/Cholesterol

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

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