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Related Experiment Video

Updated: Jan 16, 2026

Analyzing the Size, Shape, and Directionality of Networks of Coupled Astrocytes

Analyzing the Size, Shape, and Directionality of Networks of Coupled Astrocytes

Published on: October 4, 2018

Astrocytes functionally integrate multiple synapses via specialized leaflet domains.

Lucas Benoit¹, Ines Hristovska², Nicolas Liaudet³

¹University Grenoble Alpes, Inserm U1216, Grenoble Institut Neurosciences, F-38000 Grenoble, France.

|September 25, 2025

Summary

This summary is machine-generated.

Astrocyte leaflets, small structures near synapses, exhibit unique calcium (Ca2+) signaling dynamics. These signals integrate neuronal inputs, suggesting astrocytes play a key role in brain computation.

Keywords:

3D electron microscopy 3D two-photon Ca(2+) imaging HPF and FIB-SEM IP(3) receptors astrocyte astrocyte Ca(2+) signaling astrocyte integration of synaptic signals astrocyte leaflet astrocyte-synapse communication endoplasmic reticulum

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Area of Science:

Neuroscience
Cell Biology
Neuroimaging

Background:

Astrocyte calcium (Ca2+) dynamics are crucial for synaptic function and behavior.
The precise mechanisms and structures involved in astrocyte Ca2+ signaling at synapses are not well understood.

Purpose of the Study:

To characterize the ultrastructure and function of astrocyte leaflets at synapses.
To investigate the role of astrocyte Ca2+ dynamics in integrating synaptic inputs.

Main Methods:

Volumetric high-resolution electron microscopy for ultrastructural analysis.
Two-photon Ca2+ imaging to monitor astrocyte signaling dynamics in vivo.
Combined axon-leaflet Ca2+ imaging to link neuronal activity to astrocyte responses.

Main Results:

Astrocyte leaflets are convoluted structures (≤250 nm diameter) containing endoplasmic reticulum (ER) saccules with IP3 receptors, often interconnected via gap junctions.
Leaflets enwrap approximately 90% of synapses in clusters.
Synaptically induced, IP3R1-mediated Ca2+ events were identified within leaflets, integrating inputs from multiple neurons.

Conclusions:

Astrocyte leaflets form specialized domains for Ca2+ signaling at synapses.
These leaflet-mediated Ca2+ signals integrate neuronal inputs, suggesting a role for astrocytes in complex neural computations.
Astrocyte organization via Ca2+ signals may coordinate multiple synapses and circuits across different spatiotemporal scales.