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The isolation of plasma membranes is often accompanied with a loss of sensitivity to stimulatory agents (e.g. mitogens). Changes in the structure of the cell membranes after cell breakage have also been reported. Concerning this problem, "mild" cell disruption conditions were tested by using osmotic shock. Different membrane fractions were isolated, resulting in an enrichment of plasma membranes in one fraction. All fractions were characterized by plasma membrane marker enzymes (alkaline phosphatase, gamma-glutamyltransferases), the amount of cholesterol, the molar ratio of cholesterol and phospholipid, by dodecyl sulfate-gelectrophoresis and by electronmicroscopy. Total balance sheets of the fraction were made for each of the different biochemical parameters. The enriched plasma membranes resulting by using the described method had also lost the sensitivity to the stimulatory effect caused by mitogens such as Concanavalin A.

Preparation and Fractionation of Membrane Vesicles of Thymocytes after Osmotic Cell Disruption