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• W2897019230 abstract "The accurate determination of the mechanical properties of P-selectin and PSGL-1 is crucial for design and optimization of applications utilizing such bonds, e.g. biosensors and targeted drug delivery systems, as adhesion and mechanical interactions play a critical role in several key functions of biological cells. In current work, the spring constant and rupture force of a single P-selectin PSGL-1 ligand receptor bond and the Young’s modulus of a layer made of these ligand receptors are reported. The work-of-adhesion of the P-selectin PSGL-1 interface is also characterized. In the reported experiments, PSGL-1 coated particles are deposited on a P-selectin coated substrate and their transient nanometer scale out-of-plane displacements are acquired employing a laser Doppler vibrometer as they are excited by an ultrasonic field. From the spectral response of a single particle, the resonance frequencies of its vibrational motion are identified, and with help of a particle adhesion model, the average rupture force and stiffness of a single P-selectin PSGL-1 ligand receptor are determined as Frupt = 171 ± 56 pN and kb = 0.56 ± 0.04 mN/m, respectively. Furthermore, the Young’s modulus and work-of-adhesion of a layer of P-selectin PSGL-1 ligand receptors are extracted as E = 28.74 ± 3.96 MPa and WA = 70.0 ± 8.0 mJ/m2, respectively. Unlike Atomic Force Microscopy (AFM) and other probe-based techniques, the reported approach eliminates the need for direct contact with the sample, which could compromise the accuracy of the results by imposing unspecified additional contact interactions. Further, the current technique can be employed for measurements under various fluid flow conditions." @default.
• W2897019230 created "2018-10-26" @default.
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• W2897019230 date "2019-01-01" @default.
• W2897019230 modified "2023-09-30" @default.
• W2897019230 title "Mechanical properties of P-selectin PSGL-1 bonds" @default.
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• W2897019230 doi "https://doi.org/10.1016/j.colsurfb.2018.10.017" @default.
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