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Nanoscale Patterning of In Vitro Neuronal Circuits.

José C Mateus1, Sean Weaver2, Dirk van Swaay3

  • 1Neuroengineering and Computational Neuroscience Laboratory, i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, 4200-135 Porto, Portugal.

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Summary

This study introduces a novel in vitro method for precise neuronal circuit construction. It enables the study of neuronal connectivity at both circuit and synapse levels, aiding biophysical model validation.

Keywords:
axon guidancebottom-up neurosciencebrain-on-a-chipe-beam lithographymix and match lithographynanofluidicssynapse

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Area of Science:

  • Neuroscience
  • Biophysics
  • Bioengineering

Background:

  • Current in vitro methods for patterning neurons offer limited control over multiscale neuronal connectivity.
  • Studying neuronal circuits in vivo at synaptic resolution presents significant challenges.
  • There is a need for in vitro alternatives to validate biophysical and computational models of neuronal networks.

Purpose of the Study:

  • To develop an in vitro technique for multiscale control of neuronal connectivity, from circuits to synapses.
  • To create an in vitro system for validating biophysical and computational models of neuronal circuits.
  • To enable the study of neuronal circuits with synaptic resolution in a controlled environment.

Main Methods:

  • Utilized electron beam lithography and photolithography to fabricate polydimethylsiloxane (PDMS) structures with feature sizes from 150 nm to millimeters.
  • Engineered nanochannels to restrict axon growth while permitting dendritic spine passage, guiding synapse formation between neuronal nodes.
  • Employed genetically encoded calcium indicators and fluorescently tagged postsynaptic protein PSD-95 to confirm functional synapse formation.

Main Results:

  • Successfully generated large numbers of isolated feed-forward neuronal circuits in vitro.
  • Demonstrated that neuronal connections were precisely restricted to regions defined by nanochannels.
  • Confirmed the formation of functional synapses within the engineered nanochannel-connected regions.

Conclusions:

  • The developed lithography-based technique enables precise, multiscale control over neuronal connectivity in vitro.
  • This method provides a valuable platform for validating biophysical and computational models of neural circuits.
  • The approach facilitates the study of synaptic formation and function in a highly controlled experimental setting.