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Related Experiment Video

Updated: Mar 27, 2026

Recording and Modulation of Epileptiform Activity in Rodent Brain Slices Coupled to Microelectrode Arrays
10:24

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Microelectrode array scaled for human hippocampal slices.

Anssi Pelkonen1, Vera Lezhneva1, Tomi Ryynänen2,3

  • 1A. I. Virtanen Institute for Molecular Sciences, Faculty of Health Sciences, University of Eastern Finland, Kuopio, Finland.

Epilepsia Open
|March 25, 2026
PubMed
Summary
This summary is machine-generated.

A new microelectrode array (MEA), the Hippo-MEA, was developed to record electrical activity from large sections of human hippocampus tissue. This tool aids in understanding temporal lobe epilepsy (TLE) pathogenesis by capturing more comprehensive electrophysiological data.

Keywords:
action potentialhippocampuslocal field potential measurementmicroelectrode arraytemporal lobe epilepsy

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Epilepsy Research

Background:

  • Temporal lobe epilepsy (TLE) affects many patients refractory to medication, with surgical resection offering a potential cure.
  • The hippocampus is a common origin of seizures in TLE, yet its precise pathogenesis remains poorly understood.
  • Current microelectrode arrays (MEAs) cover limited areas of hippocampal tissue, hindering comprehensive electrophysiological analysis.

Purpose of the Study:

  • To develop a novel MEA, the Hippo-MEA, capable of covering a significant area of human hippocampal slices.
  • To facilitate a better understanding of TLE pathogenesis through detailed electrophysiological characterization of resected human hippocampal tissue.
  • To enable broader electrophysiological recordings across multiple hippocampal regions simultaneously.

Main Methods:

  • Design and fabrication of the custom Hippo-MEA with 60 electrodes (60 μm diameter) over a 5.6 mm × 5.6 mm area.
  • Utilizing ion beam-assisted e-beam deposition (IBAD) for titanium nitride-coated electrodes on borosilicate glass.
  • Recording extracellular action potentials (EAPs) and local field potentials (LFPs) from 300 μm thick human hippocampal slices using the MEA2100-Mini-system.

Main Results:

  • Successful recording of EAPs and LFPs from acute human hippocampal slices using the Hippo-MEA.
  • Electrophysiological activity was predominantly observed in the dentate gyrus.
  • Sclerotic and gliotic CA regions, identified via immunohistochemistry (IHC), exhibited minimal to no recorded activity.

Conclusions:

  • The Hippo-MEA is compatible with standard data acquisition systems, enabling comprehensive electrophysiological recordings from human hippocampal tissue.
  • This technology provides a valuable tool for investigating the neurophysiological mechanisms underlying TLE.
  • The Hippo-MEA facilitates a deeper understanding of hippocampal function in the context of epilepsy and surgical treatment planning.