Publication

Stimulus-evoked high frequency oscillations are present in neuronal networks on microelectrode arrays

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Last modified
  • 05/14/2025
Type of Material
Authors
    Chadwick Hales, Emory UniversityRiley Zeller-Townson, Georgia Institute of TechnologyJonathan P Newman, Georgia Institute of TechnologyJames T Shoemaker, Georgia Institute of TechnologyNathan J Killian, Georgia Institute of TechnologySteve Potter, Emory University
Language
  • English
Date
  • 2012-05-15
Publisher
  • Frontiers Media SA
Publication Version
Copyright Statement
  • Copyright © 2012 Hales, Zeller-Townson, Newman, Shoemaker, Killian and Potter.
License
Final Published Version (URL)
Title of Journal or Parent Work
Volume
  • 6
Issue
  • MAY2012
Start Page
  • 1
End Page
  • 10
Grant/Funding Information
  • Research was supported by the Clinical Research Training Fellowship from the American Academy of Neurology Foundation (Chadwick M. Hales) and NSF EFRI (0836017) (Steve M. Potter).
Abstract
  • Pathological high frequency oscillations (250-600 Hz) are present in the brains of epileptic animals and humans. The etiology of these oscillations and how they contribute to the diseased state remains unclear. This work identifies the presence of microstimulation-evoked high frequency oscillations (250-400 Hz) in dissociated neuronal networks cultured on microelectrode arrays (MEAs). Oscillations are more apparent with higher stimulus voltages. As with in vivo studies, activity is isolated to a single electrode, however, the MEA provides improved spatial resolution with no spread of the oscillation to adjacent electrodes 200 μm away. Oscillations develop across four weeks in vitro. Oscillations still occur in the presence of tetrodotoxin and synaptic blockers, and they cause no apparent disruption in the ability of oscillation-presenting electrodes to elicit directly evoked action potentials (dAPs) or promote the spread of synaptic activity throughout the culture. Chelating calcium with ethylene glycol tetraacetic acid (EGTA) causes a temporal prolongation of the oscillation. Finally, carbenoxolone significantly reduces or eliminates the high frequency oscillations. Gap junctions may play a significant role in maintaining the oscillation given the inhibitory effect of carbenoxolone, the propagating effect of reduced calcium conditions and the isolated nature of the activity as demonstrated in previous studies. This is the first demonstration of stimulus-evoked high frequency oscillations in dissociated cultures. Unlike current models that rely on complex in vivo recording conditions, this work presents a simple controllable model in neuronal cultures on MEAs to further investigate how the oscillations occur at the molecular level and how they may contribute to the pathophysiology of disease. © 2012 Hales, Zeller-Townson, Newman, Shoemaker, Killian and Potter.
Author Notes
  • Correspondence to Steve M. Potter, Laboratory for NeuroEngineering, Coulter Department of Biomedical Engineering, Georgia Institute of Technology, 313 Ferst Dr. NW, Atlanta, GA 30332-0535, USA. e-mail: steve.potter@bme.gatech.edu
Keywords
Research Categories
  • Biology, Neuroscience
  • Engineering, Biomedical

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