Thermal behavior of stearoylsphingomyelin-cholesterol dispersions
- 1 December 1981
- journal article
- research article
- Published by American Chemical Society (ACS) in Biochemistry
- Vol. 20 (25), 7115-7118
- https://doi.org/10.1021/bi00528a010
Abstract
The thermotropic behavior of aqueous dispersions of stearoylsphingomyelin-cholesterol mixtures was examined by high-sensitivity differential scanning calorimetry. When less than 20 mol % cholesterol was mixed with the sphingomyelin and the samples were held at room temperature for 7-9 days before the initiation of calorimetric measurements, a sharp endotherm at 56-57.degree. C and a broad endotherm at 35-50.degree. C were observed. In addition, samples containing 15-20 mol % sterol exhibited a sharp endotherm at 43-45.degree. C. If samples were held at room temperature for less than 2 h before the initiation of calorimetric analysis, the 56-57.degree. C endotherm was usually not seen. Instead, a combination of broad and sharp endotherms over the range of 35-50.degree. C was observed. Occasionally, exotherms were also observed within this temperature range. A cholesterol-rich phase probably coexists with a cholesterol-poor phase in which the sphingomyelin molecules may exist in 2 distinctly different gel states.This publication has 11 references indexed in Scilit:
- Compositional domain structure in phosphatidylcholine--cholesterol and sphingomyelin--cholesterol bilayers.Proceedings of the National Academy of Sciences, 1980
- Evidence for metastability in stearoylphingomyelin bilayersBiochemistry, 1980
- Anion transport across the erythrocyte membrane, in situ proteolysis of band 3 protein, and cross-linking of proteolytic fragments by 4,4′-diisothiocyano dihydrostilbene-2,2′-disulfonateBiochimica et Biophysica Acta (BBA) - Biomembranes, 1979
- Thermal behavior of synthetic sphingomyelin-cholesterol dispersionsBiochemistry, 1979
- Studies on the anomalous thermotropic behavior of aqueous dispersions of dipalmitoylphosphatidylcholine-cholesterol mixturesBiochemistry, 1978
- The preferential interactions of cholesterol with different classes of phospholipidsBiochimica et Biophysica Acta (BBA) - Biomembranes, 1977
- Immiscibility in phosphatidylcholine‐cholesterol mixturesFEBS Letters, 1976
- Lateral phase separations in binary mixtures of cholesterol and phospholipidsBiochemical and Biophysical Research Communications, 1973
- Correlative relationship of cholesterol and sphingomyelin in cell membranesJournal of Theoretical Biology, 1970
- Study of biological structure at the molecular level with stereomodel projections I. The lipids in the myelin sheath of nerveJournal of Oil & Fat Industries, 1963