Multisite Electrophysiological Recordings by Self-assembled Loose-patch-like Junctions Between Cultured Hippocampal Neurons and Mushroom-shaped Microelectrodes

Overview

Journal Sci Rep

Specialty Science

Date 2016 Jun 4

PMID 27256971

Citations 34

Authors

Nava Shmoel

Noha Rabieh

Silviya M Ojovan

Hadas Erez

Eilon Maydan

Micha E Spira

Affiliations

Soon will be listed here.

Abstract

Substrate integrated planar microelectrode arrays is the "gold standard" method for millisecond-resolution, long-term, large-scale, cell-noninvasive electrophysiological recordings from mammalian neuronal networks. Nevertheless, these devices suffer from drawbacks that are solved by spike-detecting, spike-sorting and signal-averaging techniques which rely on estimated parameters that require user supervision to correct errors, merge clusters and remove outliers. Here we show that primary rat hippocampal neurons grown on micrometer sized gold mushroom-shaped microelectrodes (gMμE) functionalized simply by poly-ethylene-imine/laminin undergo self-assembly processes to form loose patch-like hybrid structures. More than 90% of the hybrids formed in this way record monophasic positive action potentials (APs). Of these, 34.5% record APs with amplitudes above 300 μV and up to 5,085 μV. This self-assembled neuron-gMμE configuration improves the recording quality as compared to planar MEA. This study characterizes and analyzes the electrophysiological signaling repertoire generated by the neurons-gMμE configuration, and discusses prospects to further improve the technology.

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