Related Experiment Video
Updated: Feb 23, 2026
16:38
Dual Electrophysiological Recordings of Synaptically-evoked Astroglial and Neuronal Responses in Acute Hippocampal Slices
Published on: November 26, 2012
28.0K
Astrocyte-Mediated Neuronal Synchronization Properties Revealed by False Gliotransmitter Release
Tiina M Pirttimaki1, Robert E Sims1, Gregory Saunders1
1School of Life and Health Sciences, Aston University, Birmingham B4 7ET, United Kingdom.
Summary
Astrocytes release glutamate (GT) that synchronizes neurons. Increasing glutamate supply enhances this GT release, influencing neuronal networks across brain regions and potentially contributing to pathological states.
Area of Science:
- Neuroscience
- Astrocyte Biology
- Glial Physiology
Background:
- Astrocytes release glutamate (Glut) as gliotransmitters (GTs), modulating neuronal activity via NMDAR-mediated slow inward currents (SICs).
- Factors controlling spontaneous GT release and its network influence remain incompletely understood.
Purpose of the Study:
- To investigate the supply-dependence of astrocyte GT release.
- To determine the extent and properties of neuronal excitation mediated by astrocyte-derived GTs in different brain regions.
Main Methods:
- Utilized rat brain slices and exogenous D-aspartate (D-Asp) as a false GT.
- Measured frequency and signaling charge of SICs and analyzed synchronized neuronal NMDAR-mediated excitation using calcium imaging.
- Examined effects in ventrobasal thalamus, CA1 hippocampus, and somatosensory cortex.
Main Results:
- Increased Glut supply elevated the frequency and charge of SICs, demonstrating supply-dependent GT release.
- Astrocyte-derived GT release synchronized neuronal populations over distances >200 μm in multiple brain areas.
- Neuronal synchronization properties were conserved across brain regions, with individual neurons participating in multiple synchronized networks.
Conclusions:
- Astrocytes function as excitatory nodes influencing neuronal networks over significant distances.
- GT release is supply-dependent, and astrocyte-neuron signaling properties are conserved across brain regions.
- Chronic elevation of ambient Glut may increase GT release, relevant to pathological conditions.
