Related Experiment Video
Updated: Jun 29, 2025
16:38
Dual Electrophysiological Recordings of Synaptically-evoked Astroglial and Neuronal Responses in Acute Hippocampal Slices
Published on: November 26, 2012
27.3K
Astrocyte switch to the hyperactive mode
Shun Araki1, Ichinosuke Onishi1, Yoko Ikoma2
1Super-network Brain Physiology, Graduate School of Medicine, Tohoku University, Sendai, Japan.
Glia
|April 9, 2024
Summary
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.
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.
