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Updated: Jun 29, 2025

Dual Electrophysiological Recordings of Synaptically-evoked Astroglial and Neuronal Responses in Acute Hippocampal Slices

Dual Electrophysiological Recordings of Synaptically-evoked Astroglial and Neuronal Responses in Acute Hippocampal Slices

Published on: November 26, 2012

Astrocyte switch to the hyperactive mode.

Shun Araki¹, Ichinosuke Onishi¹, Yoko Ikoma²

¹Super-network Brain Physiology, Graduate School of Medicine, Tohoku University, Sendai, Japan.

|April 9, 2024

Summary

This summary is machine-generated.

Astrocytes, a type of brain cell, may trigger epileptic seizures. Aberrant astrocyte calcium events preceded neuronal hyperactivity, suggesting a role in epileptogenesis and potential new epilepsy treatments targeting astrocytes.

Keywords:

astrocyte direct current stimulation epilepsy fiber photometry fluorocitrate hippocampus optogenetics

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Last Updated: Jun 29, 2025

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Isolation and Culture of Mouse Cortical Astrocytes

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Published on: January 19, 2013

Area of Science:

Neuroscience
Cellular Biology
Epilepsy Research

Background:

Astrocytes influence neuronal activity in health and disease.
The role of astrocytes in initiating epileptic seizures remains unclear.

Purpose of the Study:

To investigate if astrocytes can act as a trigger for epileptic seizures.
To explore the role of astrocyte calcium signaling in epileptogenesis.

Main Methods:

Induced spontaneous neuronal hyperactivity using copper implantation in vivo.
Recorded local field potentials and astrocyte cytosolic calcium (Ca2+) using electrophysiology and fiber photometry.
Utilized optogenetic stimulation and metabolic inhibition (fluorocitrate) for astrocyte manipulation.

Main Results:

Aberrant astrocyte Ca2+ events frequently preceded neuronal hyperactivity, suggesting a role in seizure initiation.
Astrocyte Ca2+ increases preceded neuronal hyperactivity by approximately 20 seconds.
Astrocyte-specific stimulation induced neuronal hyperactivity, while inhibition reduced it.

Conclusions:

Astrocytes play a role in triggering individual epileptic seizures.
Reciprocal astrocyte-neuron interactions amplify seizure activity.
Targeting astrocytes may offer a novel therapeutic strategy for epilepsy control.