These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
Preprints are manuscripts made publicly available before they have been submitted for formal peer review and publication. They might contain new research findings or data. Preprints can be a draft or final version of an author's research but must not have been accepted for publication at the time of submission.
revised on 25.02.2020 and posted on 26.02.2020by Jie Ju, Ning Hu, Dana Cairns, Haitao Liu, Brian Timko
Bioelectronic scaffolds that support devices while promoting tissue integration could enable tissue hybrids with augmented electronic capabilities. Here, we demonstrate a Photo-crosslinkable Silk Fibroin (PSF) derivative and investigate its structural, electrical and chemical properties. Lithographically-defined PSF films offered tunable thickness and <1 μm spatial resolution, and could be released from a relief layer yielding freestanding scaffolds with cm-scale uniformity. These constructs were electrically insulating; multi-electrode arrays with PSF-passivated interconnects provided stable electrophysiological readouts from HL-1 cardiac model cells, brain slices and hearts. Compared to SU8, a ubiquitous biomaterial, PSF exhibited superior affinity toward neurons which we attribute to its favorable surface charge and enhanced attachment of poly-d-lysine adhesion factors. This finding is of significant importance in bioelectronics, where tight junctions between devices and cell membranes are necessary for electronic communication. Collectively, our findings are generalizable to a variety of geometries, devices and tissues, establishing PSF as a promising bioelectronic platform.
Read the published paper
in Proceedings of the National Academy of Sciences