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The human erythrocyte membrane skeleton may be an ionic gel

I. Membrane mechanochemical properties

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Abstract

Biochemical and biophysical observations indicate that the erythrocyte membrane skeleton is composed of a swollen network of long, flexible and ionizable macromolecules located at the cytoplasmic surface of the fluid membrane lipid bilayer. We have analyzed the mechanochemical properties of the erythrocyte membrane assuming that the membrane skeleton constitutes an ionic gel (swollen ionic elastomer). Using recently established statistical thermodynamic theory for such gels, our analysis yields mathematical expressions for the mechanochemical properties of erythrocyte membranes that incorporate membrane molecular parameters to an extent not achieved previously. The erythrocyte membrane elastic shear modulus and maximum elastic extension ratio predicted by our membrane model are in quantitative agreement with reported values for these parameters. The gel theory predicts further that the membrane skeleton modulus of area compression, K G, may be small as well as large relative to the membrane elastic shear modulus, G, depending on the environmental conditions. Our analysis shows that the ratio between these two parameters affects both the geometry and the stability of the favoured cell shapes.

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  1. Division of Biophysics, University of Trondheim, N-7034, Trondheim-NTH, Norway

    B. T. Stokke, A. Mikkelsen & A. Elgsaeter

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  1. B. T. Stokke
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  2. A. Mikkelsen
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  3. A. Elgsaeter
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Stokke, B.T., Mikkelsen, A. & Elgsaeter, A. The human erythrocyte membrane skeleton may be an ionic gel. Eur Biophys J 13, 203–218 (1986). https://doi.org/10.1007/BF00260368

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