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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Skeletal-muscle sarcolemma from normal and dystrophic mice. Isolation, characterization and lipid composition.

1. Mouse skeletal-muscle sarcolemma was isolated, and the preparations obtained from normal mouse muscle and from muscle of mice with hereditary muscular dystrophy were characterized with respect to appearance under the optical and electron microscopes, distribution of marker enzymes, histochemical properties and biochemical composition. 2. The sarcolemmal membranes from normal and dystrophic muscle were subjected to detailed lipied analysis. Total lipid content was shown to increase in sarcolemma from dystrophic mice as a result of a large increase in neutral lipid and a smaller increase in total phospholipids. Further analysis of the neutral-lipid fraction showed that total acylglycerols increased 6-fold, non-esterified fatty acid 4-fold and cholesterol esters 2-fold, whereas the amount of free cholesterol remained unchanged in sarcolemma from dystrophic muscle. Significant increases were found in lysophosphatidylcholine, phosphatidylcholine and phosphatidylethanolamine in dystrophic-muscle sarcolemma; however, the relative composition of the phospholipid fraction remained essentially the same as in the normal case. 3. The overall result of alterations in lipid composition of the sarcolemma in mouse muscular dystrophy was an increase in neutral lipid compared with total phospholipid, and a 4-fold decrease in the relative amount of free cholesterol in the membrane. The possible impact of these changes on membrane function is discussed.[1]


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