Whispering gallery mode biosensor quantification of fibronectin adsorption kinetics onto alkylsilane monolayers and interpretation of resultant cellular response

    Authors

    K. A. Wilson; C. A. Finch; P. Anderson; F. Vollmer;J. J. Hickman

    Comments

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    Abbreviated Journal Title

    Biomaterials

    Keywords

    Biosensor; Biocompatibility; Computational fluid dynamics; Modeling; Protein adsorption; Surface modification; SERUM-FREE MEDIUM; HIPPOCAMPAL-NEURONS; PROTEIN ADSORPTION; SURFACE-CHEMISTRY; CONFORMATIONAL-CHANGES; INTEGRIN BINDING; ADHESION; GROWTH; SHIFT; DIFFERENTIATION; Engineering, Biomedical; Materials Science, Biomaterials

    Abstract

    A Whispering Gallery Mode (WGM) biosensor was constructed to measure the adsorption of protein onto alkysilane self-assembled monolayers (SAMs) at solution concentrations unattainable with other techniques. The high sensitivity was provided by a WGM resonance excited in a silica microsphere that was functionalized with alkylsilane SAMs and integrated in a microfluidic flow cell under laminar flow conditions. It was found that FN adsorbed at biologically relevant surface densities, however, the adsorption kinetics and concentration dependent saturation values varied significantly from work published utilizing alkanethiol SAMs. Mathematical models were applied to the experimental results to interpret the observed kinetics of FN adsorption. Embryonic hippocampal neurons and skeletal myoblasts were cultured on the modified surfaces, a live dead assay was used to determine the viability of the FN surfaces for cell culture, and major differences were noted in the biological response to the different SAMs. The high sensitivity and simplicity of the WGM biosensor, combined with its ability to quantify the adsorption of any dilute protein in a label-free assay, establishes the importance of this technology for the study of surface accretion and its effect on cellular function, which can affect biomaterials for both in vivo and in vitro applications. (C) 2011 Elsevier Ltd. All rights reserved.

    Journal Title

    Biomaterials

    Volume

    33

    Issue/Number

    1

    Publication Date

    1-1-2012

    Document Type

    Article

    Language

    English

    First Page

    225

    Last Page

    236

    WOS Identifier

    WOS:000297399700023

    ISSN

    0142-9612

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