Structure-function dynamics of engineered, modular neuronal networks with controllable afferent-efferent...

Area of Science:

• Neuroscience
• Bioengineering
• Systems Biology

Background:

• Microfluidic devices with microelectrode arrays are advanced tools for in vitro neuronal network research.
• Engineered neuronal networks mimic brain topology, but their functional impact is poorly understood.
• Controlling network connectivity is crucial for studying neuronal assembly organization.

Purpose of the Study:

• To develop a microfluidic device for controlled afferent connectivity in engineered neuronal networks.
• To investigate how network topology influences functional organization and dynamics.
• To provide a model system for studying neuronal assemblies at micro- and mesoscales.

Main Methods:

• Utilized microfluidic devices with Tesla valve-inspired channels for unidirectional axonal outgrowth.
• Employed designer viral tools for fluorescent neuronal labeling and structural visualization.
• Performed extracellular electrophysiological recordings with nanoporous microelectrodes to assess network function.

Main Results:

• Achieved effective control of afferent connectivity through geometrically constrained axon guiding channels.
• Demonstrated enhanced network modularity and efficiency compared to single-node controls.
• Observed feedforward signal transmission between neuronal populations upon electrical stimulation.

Conclusions:

• The developed microfluidic device enables precise control and longitudinal study of neuronal network structure and function.
• This model system offers novel insights into neuronal assembly development, organization, and neuroplasticity.
• Facilitates research on micro- and mesoscale neuronal networks in both healthy and perturbed states.