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Although cholesterol is one of the major components of plasma membranes in eukaryotic cells, very little is known about its role in biological membranes. We reported previously (Okimasu et al., Cell Struct. Funct. 11, 273-283, 1986) that introduction of cholesterol into the liposomal membrane caused a decrease in membrane permeability, especially by the binding of cytoplasmic proteins to the liposomal membrane. The present study was carried out to further clarify the biochemical function of cholesterol in the membrane-protein interactions, especially under high osmotic pressure. The association of membranes with cytoplasmic proteins and their permeability were decreased by the introduction of cholesterol, but its effects were diminished in a hypertonic medium. The protein species associated with cholesterol-containing liposomes vary depending on the sort of hypertonic condition. It was suggested that since the degree of lipid packing by the cholesterol was reduced by the locally increased curvature in the lipid bilayer under high osmotic pressure, some cytoplasmic proteins can penetrate into the liposomal membrane.

Inhibitory effect of cholesterol on interaction between cytoplasmic actin and liposomes, and restorative effect of high osmotic pressure.