A three-dimensional multi-electrode array for multi-site stimulation and recording in acute brain slices.

Area of Science:

• Neuroscience
• Bioengineering
• Electrophysiology

Background:

• Multi-electrode arrays (MEAs) with planar electrodes are used for neuronal recording.
• Planar electrodes are unsuitable for acute brain slices due to a dead cell layer.
• Existing MEAs face challenges in accessing viable neurons in acute slice preparations.

Purpose of the Study:

• To develop and evaluate 3D protruding electrodes for improved acute brain slice recordings.
• To overcome the dead cell layer limitation of planar electrodes.
• To compare the performance of 3D electrodes against traditional planar electrodes.

Main Methods:

• Design and fabrication of both planar and 3D protruding multi-electrode arrays.
• Electrical simulation and experimental verification of electrode configurations.
• Stimulation and recording experiments using acute rat hippocampus slices.

Main Results:

• 3D protruding electrodes demonstrated significantly larger signal amplitudes (millivolt range).
• Single-cell activity spikes were successfully monitored in the hippocampus CA3 and CA1 regions using 3D electrodes.
• 3D electrodes provide improved access to living neurons within acute brain slices.

Conclusions:

• 3D protruding electrodes offer a superior solution for electrophysiological recordings from acute brain slices.
• This novel electrode design enhances signal quality and enables detailed neuronal activity monitoring.
• The findings pave the way for more effective in vitro studies of neural circuits.