Promoting neurite outgrowth from spiral ganglion neuron explants using polypyrrole/BDNF-coated electrodes
AuthorEvans, AJ; Thompson, BC; Wallace, GG; Millard, R; O'Leary, SJ; Clark, GM; Shepherd, RK; Richardson, RT
Source TitleJournal of Biomedical Materials Research Part A
University of Melbourne Author/sO'Leary, Stephen; Clark, Graeme; Shepherd, Robert; Richardson, Rachael; Millard, Rodney; NEIL, ALISON
AffiliationDepartment of Otolaryngology, Faculty of Medicine, Dentistry & Health Sciences
Document TypeJournal Article
CitationsEvans, A. J., Thompson, B. C., Wallace, G. G., Millard, R., O'Leary, S. J., Clark, G. M., Shepherd, R. K. & Richardson, R. T. (2009). Promoting neurite outgrowth from spiral ganglion neuron explants using polypyrrole/BDNF-coated electrodes. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A, 91A (1), pp.241-250. https://doi.org/10.1002/jbm.a.32228.
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Release of neurotrophin-3 (NT3) and brain-derived neurotrophic factor (BDNF) from hair cells in the cochlea is essential for the survival of spiral ganglion neurons (SGNs). Loss of hair cells associated with a sensorineural hearing loss therefore results in degeneration of SGNs, potentially reducing the performance of a cochlear implant. Exogenous replacement of either or both neurotrophins protects SGNs from degeneration after deafness. We previously incorporated NT3 into the conducting polymer polypyrrole (Ppy) synthesized with para-toluene sulfonate (pTS) to investigate whether Ppy/pTS/NT3-coated cochlear implant electrodes could provide both neurotrophic support and electrical stimulation for SGNs. Enhanced and controlled release of NT3 was achieved when Ppy/pTS/NT3-coated electrodes were subjected to electrical stimulation. Here we describe the release dynamics and biological properties of Ppy/pTS with incorporated BDNF. Release studies demonstrated slow passive diffusion of BDNF from Ppy/pTS/BDNF, with electrical stimulation significantly enhancing BDNF release over 7 days. A 3-day SGN explant assay found that neurite outgrowth from explants was 12.3-fold greater when polymers contained BDNF (p < 0.001), although electrical stimulation did not increase neurite outgrowth further. The versatility of Ppy to store and release neurotrophins, conduct electrical charge, and act as a substrate for nerve-electrode interactions is discussed for specialized applications such as cochlear implants.
Keywordsbrain-derived neurotrophic factor; polypyrrole; cochlear implant; electrical stimulation; sensorineural hearing loss; spiral ganglion neuron
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