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Cryopreserved rat cortical cells develop functional neuronal networks on microelectrode arrays.

Frauke Otto1, Philipp Görtz, Wiebke Fleischer

  • 1Department of Neurology, Heinrich-Heine-University, Moorenstr. 5, 40225 Düsseldorf, Germany.

Journal of Neuroscience Methods
|September 2, 2003
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Summary

Cryopreserved cortical neurons (CCx) offer a stable and active alternative to acutely dissociated neurons for microelectrode array (MEA) studies. These neurochips are suitable for long-term neuronal network analysis and pharmaceutical screening.

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Area of Science:

  • Neuroscience
  • Biotechnology
  • Pharmacology

Background:

  • Microelectrode arrays (MEAs) are valuable for studying neuronal networks and drug responses.
  • Stable neuronal activity on MEAs is crucial for broad applications like pharmaceutical screening.

Purpose of the Study:

  • To compare the suitability of cryopreserved cortical neurons (CCx) with acutely dissociated neurons (Cx) for MEA-based studies.
  • To assess the stability, activity, and electrophysiological properties of CCx cultured on MEAs.

Main Methods:

  • Culturing of CCx and Cx on MEAs.
  • Immunocytochemical analysis for neuron-specific markers.
  • Electrophysiological recordings of spontaneous spike activity (SSA).
  • Drug-induced inhibition studies using Tetrodotoxin (TTX), magnesium, APV, and GABA.

Main Results:

  • Both CCx and Cx formed functional neuritic networks expressing key neuronal markers.
  • CCx exhibited stable spontaneous spike activity (SSA) for up to 74 days in vitro (DIV), comparable to Cx (5-30 DIV).
  • Both cell types showed similar synchronized burst activity and TTX-reversible SSA.
  • Pharmacological profiling of CCx revealed dose-dependent responses to TTX, magnesium, APV, and GABA.

Conclusions:

  • Cryopreserved cortical neurons (CCx) provide a viable, stable, and long-lasting neuronal network on MEAs.
  • CCx are easy to handle and possess electrophysiological characteristics similar to acutely dissociated neurons.
  • These findings support the use of CCx on MEAs for investigating neuronal network properties and pharmaceutical screening.