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• W2036707800 abstract "The adhesion of giant unilamellar phospholipid vesicles to planar substrates coated with extracellular matrix mimetic cushions of hyaluronan is studied using quantitative reflection interference contrast microscopy. The absolute height of the vesicle membrane at the vicinity of the substrate is measured by considering, for the first time, the refractive indices of the reflecting media. The thickness of the cushion is varied in the range of approximately 50-100 nm, by designing various coupling strategies. On bare protein-coated substrates, the vesicles spread fast (0.5 s) and form a uniform adhesion disk, with the average membrane height approximately 4 nm. On thick hyaluronan cushions (>80 nm), the membrane height is approximately the same as the thickness of the cushion, implying that the vesicle lies on top of the cushion. On a thin and inhomogeneous hyaluronan cushion, the adhesion is modified but not prevented. The spreading is slow ( approximately 20 s) compared to the no-cushion case. The average membrane height is approximately 10 nm and the adhesion disk is studded with blisterlike structures. Observations with fluorescent hyaluronan indicate that the polymer is compressed under, rather than expelled from, the adhesion disk. The adhesion energy density is approximately threefold higher in the no-cushion case (1.2 microJ/m(2)) as compared to the thin-cushion case (0.54 microJ/m(2)). In the thin-cushion case, the presence of short ( approximately 4 nm) glyco-polymers on the vesicles results in a hitherto unreported stable partial adhesion state--the membrane height ranges from zero to approximately 250 nm. The minimal model system presented here mimics in vitro the hyaluronan-modulated early stages of cell adhesion, and demonstrates that the presence of a polymer cushion influences both the final equilibrium adhesion-state and the spreading kinetics." @default.
• W2036707800 created "2016-06-24" @default.
• W2036707800 creator A5023282203 @default.
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• W2036707800 date "2007-11-01" @default.
• W2036707800 modified "2023-10-11" @default.
• W2036707800 title "Modulation of Vesicle Adhesion and Spreading Kinetics by Hyaluronan Cushions" @default.
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• W2036707800 doi "https://doi.org/10.1529/biophysj.107.105544" @default.
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