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Enhancing Surface Immobilization of Bioactive Molecule via Silica Nanoparticle Base Coating

Abstract

Surface modification is of significant interest in biomaterials, biosensors, and device biocompatibility. Immobilization of bioactive or biomimetic molecules is a common method of disguising a foreign body as host tissue to decrease the foreign body response (FBR) and/or increase the device-tissue integration. For example, in neural interfacing devices, immobilization of L1, a neuron specific adhesion molecule has been shown to increase neuron adhesion and reduce inflammatory gliosis on and around the implants. However, the activity of modified surfaces is limited by the relatively low concentration of the immobilized component, in part due to the low surface area of flat surfaces available for modification. In this work, we demonstrate a novel method of increasing the device surface area by attaching a layer of thiolated silica nanoparticles (TNPs). This coating method results in an almost two-fold increase in immobilized L1 protein. L1 immobilized nanotextured surfaces showed a 100 % increase in neurite outgrowth than smooth L1 immobilized surfaces without increasing the adhesion of astrocytes in vitro. The increased bioactivity observed in the cell assay was determined to be mainly a result of the higher protein surface density, not the increase in surface roughness. In addition, we tested immobilization of a superoxide dismutase mimic (SODm) on smooth and roughened substrates. The SODm immobilized rough surfaces demonstrated 145% increase in superoxide scavenging activity than chemically matched smooth surfaces. These results not only show promise in improving biomimetic coating for neural implants, may also improve surface immobilization efficacy in other fields such as catalysts, protein purification, sensors, and tissue engineering devices.

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Publication details

The article was received on 09 Feb 2018, accepted on 03 Apr 2018 and first published on 06 Apr 2018


Article type: Paper
DOI: 10.1039/C8TB00408K
Citation: J. Mater. Chem. B, 2018, Accepted Manuscript
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    Enhancing Surface Immobilization of Bioactive Molecule via Silica Nanoparticle Base Coating

    K. Woeppel, X. S. Zheng and X. T. Cui, J. Mater. Chem. B, 2018, Accepted Manuscript , DOI: 10.1039/C8TB00408K

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