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• W2020670733 abstract "The fluorescence polarization technique with 1,6-diphenyl 1,3,5-hexatriene as a probe was used to determine the lipid microviscosity, η, of isolated plasma membranes of mouse thymus-derived ascitic leukemia (GRSL) cells and of extracellular membraneous vesicles exfoliated from these cells and occurring in the ascites fluid. For comparison, η was also determined in isolated plasma cell supernatants. For isolated plasma membranes of thymocytes and GRSL cells η values at 25° C amounted to 4.67 and 3.28 P, respectively, which were higher than the microviscosities of the corresponding intact cells, 3.24 and 1.73 P, respectively. Microviscosities inextracellular membranes of thymocytes and GRSL cells were 5.96 and 5.83 P, respectively. The fluidity difference between these membranes and plasma membranes was most pronounced for the leukemic cells and was thereby correlated with a large difference in cholesterol/phospholipid molar ratio (1.19 for extracellular membranes and 0.37 for plasma membranes). It is proposed that extracellular membraneous vesicles are shed from the surface of GRSL cells similar to the budding process of viruses, that is by selection of the most rigid parts of the host cell membrane. Liposomes of total lipid extracts of plasma membranes and extracellular membranes of both cell types exhibited about the same microviscosity as the corresponding intact membranes, indicating virtually no contribution of (glyco)-protein to the lipid fluidity as measured by the fluorescence polarization technique. For both cell types η (25° C) values of liposomes consisting of membrane phospholipids varied between 1.5 and 1.9 P, much lower than the values for total lipids, indicating a significant rigidizing effect of cholesterol in each type of membrane." @default.
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• W2020670733 date "1977-06-01" @default.
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• W2020670733 title "Differences in lipid fluidity among isolated plasma membranes of normal and leukemic lymphocytes and membranes exfoliated from their cell surface" @default.
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• W2020670733 doi "https://doi.org/10.1016/0005-2736(77)90308-x" @default.
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