Multisite Attenuated Intracellular Recordings by Extracellular Multielectrode Arrays, a Perspective

Area of Science:

• Neuroscience
• Electrophysiology
• Biophysics

Background:

• Multielectrode arrays (MEAs) are crucial for studying neuronal and cardiomyocyte networks, but planar sensors limit recordings to extracellular potentials.
• Current MEA technology is largely insensitive to sub-threshold synaptic potentials, a critical aspect of neural signaling.
• Existing intracellular recording methods with MEAs often involve invasive nano-probes.

Purpose of the Study:

• To develop a novel bioinspired approach for recording intracellular potentials using extracellular electrodes.
• To overcome the limitations of conventional planar MEA technology in capturing detailed electrophysiological signals.
• To harness cellular energy to facilitate intimate cell-electrode contact for enhanced signal acquisition.

Main Methods:

• Development of a bioinspired MEA system utilizing gold mushroom-shaped microelectrodes.
• Employing cellular energy to self-force cells into close contact with extracellular electrodes.
• Recording attenuated synaptic and action potentials with intracellular characteristics.

Main Results:

• Demonstrated the ability to record intracellular potentials using an array of extracellular electrodes.
• Elaborated on the biophysical principles enabling intracellular recordings via extracellular contacts.
• Illustrated the capabilities and constraints of this novel recording methodology.

Conclusions:

• The bioinspired approach offers a promising alternative for intracellular recordings with MEAs.
• This method overcomes the 'blindness' of traditional MEAs to sub-threshold synaptic potentials.
• Further improvements are anticipated to enhance the prospects of this technology in electrophysiological research.