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The effect of cholesterol hemisuccinate incorporation on the rheological properties of the erythrocyte membrane was assessed by measuring deformability (elongation index) and osmotic fragility ("baseline hemolysis"). These two experimental methods have different response sensitivities according to the incubation protocols (12 h 25 degrees C/12 h 25 degrees C then 12 h 37 degrees C) ant to the amount of cholesterol incorporated in the membrane (C/Pt from 0.18 to 0.83). The deformability and osmotic fragility variations observed are inversely related with the cholesterol concentrations incorporated. The experimental differences observed in the deformability and osmotic fragility are discussed in view of the type of membrane deformation and of the signals collected by the two systems.
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