A fast stimulability screening protocol for neuronal cultures on microelectrode arrays

Area of Science:

• Neuroscience
• Electrophysiology
• Cell Culture

Background:

• Microelectrode arrays (MEAs) are crucial for studying neuronal electrical activity in brain slices and cultures.
• Assessing electrical stimulation responses in MEA experiments necessitates identifying stimulable sites.
• Spatial stimulability screening is challenging in unstructured neuronal cultures due to unknown potential stimulation sites and lengthy screening times.

Purpose of the Study:

• To develop and validate a fast stimulation protocol for microelectrode array (MEA) experiments.
• To overcome the limitations of traditional screening methods in neuronal cultures, such as long screening times and network effects.
• To enable efficient identification of stimulable locations for subsequent pathway analysis.

Main Methods:

• Implementation of a novel fast stimulation protocol utilizing pseudorandom stimulation site switching.
• Screening of neuronal cultures to detect stimulable locations using the developed protocol.
• Application of repeated stimulation on identified sites to observe neuronal pathway activity.

Main Results:

• The proposed pseudorandom stimulation protocol significantly reduces screening time compared to conventional methods.
• The protocol effectively identifies stimulable locations in neuronal cultures without causing substantial network perturbations.
• Demonstrated usability of the protocol for detecting and analyzing neuronal pathways.

Conclusions:

• The pseudorandom stimulation site switching protocol offers an efficient and less disruptive method for MEA-based stimulability screening.
• This approach enhances the feasibility of spatial screening in unstructured neuronal cultures.
• The validated protocol facilitates detailed investigation of neuronal pathways through targeted electrical stimulation.