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Related Experiment Video

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Multi-electrode Array Recordings of Human Epileptic Postoperative Cortical Tissue

Multi-electrode Array Recordings of Human Epileptic Postoperative Cortical Tissue

Published on: October 26, 2014

Hyperpolarization-activated cation currents in human epileptogenic neocortex.

Stephan Wierschke¹, Thomas-Nicolas Lehmann, Christoph Dehnicke

¹Institute for Cell Biology and Neurobiology, Center for Anatomy, Charité Universitätsmedizin Berlin, Berlin, Germany.

|August 22, 2009

Summary

Hyperpolarization-activated cation currents (I(H)) are altered in human epilepsy. A deficit in I(H) fast component in temporal lobe epilepsy may increase seizure probability.

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Last Updated: Jun 20, 2026

Multi-electrode Array Recordings of Human Epileptic Postoperative Cortical Tissue

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Published on: October 26, 2014

Preparation of Acute Human Hippocampal Slices for Electrophysiological Recordings

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Published on: May 7, 2020

High-Quality Seizure-Like Activity from Acute Brain Slices Using a Complementary Metal-Oxide-Semiconductor High-Density Microelectrode Array System

High-Quality Seizure-Like Activity from Acute Brain Slices Using a Complementary Metal-Oxide-Semiconductor High-Density Microelectrode Array System

Published on: September 27, 2024

Area of Science:

Neuroscience
Epilepsy Research
Ion Channel Physiology

Background:

Hyperpolarization-activated cation currents (I(H)) are crucial for regulating neuronal excitability.
Previous studies in animal epilepsy models show conflicting changes in I(H).

Purpose of the Study:

To characterize the properties of I(H) in human epileptogenic neocortex.
To investigate potential alterations in I(H) contributing to epilepsy.

Main Methods:

Whole-cell patch-clamp recordings were performed on neurons from human epilepsy surgery tissues (TLE and FLE) and rat cortex.
Voltage-clamp recordings analyzed time- and voltage-dependent inward currents.

Main Results:

Neurons from temporal lobe epilepsy (TLE) exhibited a smaller and slower activating I(H) fast component compared to frontal lobe epilepsy (FLE) neurons.
Lower I(H) fast component density in TLE correlated with a higher frequency of grand mal and complex partial seizures.

Conclusions:

Biophysical properties suggest a deficit of HCN1 subunits in the human epileptogenic neocortex.
This deficit may enhance neuronal excitability and increase the likelihood of seizure activity.