Abstract
The mitogenic response of human peripheral lymphocytes to lectins can be decreased by brief treatment of the cells with lecithin-cholesterol liposomes. This fact indicates that the temporary increase of membrane fluidity, which occurs within 30 min after addition of mitogenic lectins, is an important early event for the subsequent activation of lymphocytes. This temporary increase of membrane fluidity is accompanied by neither a decrease in cellular cholesterol level nor by particular acceleration of the incorporation of polyunsaturated fatty acids into phospholipids. These facts suggest that this change in membrane fluidity is not due to the alteration of membrane lipid composition, but can be regarded as a result of temporary perturbation of membrane lipid bilayers induced by binding of the lectins to their membrane receptors.
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