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- W2045150844 abstract "Biomimetic models of cell surfaces were designed to study the physical basis of cell adhesion. Vesicles bearing reconstituted blood platelet integrin receptors αIIbβ3 were spread on ultrathin films of cellulose, forming continuous supported membranes. One fraction of the integrin receptors, which were facing their extracellular domain toward the aqueous phase, were mobile, exhibiting a diffusion constant of 0.6 μm2 s−1. The functionality of receptors on bare glass and on cellulose cushions was compared by measuring adhesion strength to giant vesicles. The vesicles contained lipid-coupled cyclic hexapeptides that are specifically recognized by integrin αIIbβ3. To mimic the steric repulsion forces of the cell glycocalix, lipids with polyethylene glycol headgroups were incorporated into the vesicles. The free adhesion energy per unit area Δgad was determined by micro-interferometric analysis of the vesicle’s contour near the membrane surface in terms of the equilibrium of the elastic forces. By accounting for the reduction of the adhesion strength by the repellers and from measuring the density of receptors one could estimate the specific receptor ligand binding energy. We estimate the receptor-ligand binding energy to be 10 kBT under bioanalogue conditions." @default.
- W2045150844 created "2016-06-24" @default.
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- W2045150844 date "2003-07-01" @default.
- W2045150844 modified "2023-10-16" @default.
- W2045150844 title "Functional Incorporation of Integrins into Solid Supported Membranes on Ultrathin Films of Cellulose: Impact on Adhesion" @default.
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- W2045150844 doi "https://doi.org/10.1016/s0006-3495(03)74508-1" @default.
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