A Photosensitive Surface Capable Of Inducing Electrophysiological Changes In Ng108-15 Neurons

Keywords

Current clamp; Neuronal stimulation; Retinal prosthetic; Self-assembled monolayer (SAM); Voltage clamp

Abstract

Retinal prostheses promise to be a viable therapy for many forms of blindness. Direct stimulation of neurons using an organic light-sensitive, self-assembled monolayer surface offers a simple alternative to conventional semiconductor technology. For this purpose we have derivatized an indium tin oxide (ITO) substrate with the photosensitive dye, NK5962, using 3-(aminopropyl)trimethoxysilane (APTMS) as cross-linker. The surface was characterized through contact angle goniometry, electrochemical impedance spectroscopy, grazing angle infrared and ultraviolet-visible spectrophotometry. NG108-15 neurons were grown on the ITO-APTMS-NK5962 surface and neural responses from electrical stimulation vs. photostimulation through the ITO-APTMS-NK5962 surface were measured using patch clamp electrophysiology. Under these conditions, photostimulation of depolarized cells caused an approximate 2-fold increase in voltage-gated sodium (Na+) current amplitude at a membrane potential of -30 mV. Our results demonstrate the feasibility of stimulating neurons, grown on light-sensitive surfaces, with light impulses, which ultimately may facilitate the fabrication of a simple, passive retinal prosthetic.

Publication Date

1-1-2015

Publication Title

Acta Biomaterialia

Volume

12

Issue

1

Number of Pages

42-50

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.actbio.2014.10.023

Socpus ID

84924962799 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84924962799

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