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Updated: Jul 21, 2025

Measuring Near Plasma Membrane and Global Intracellular Calcium Dynamics in Astrocytes

Measuring Near Plasma Membrane and Global Intracellular Calcium Dynamics in Astrocytes

Published on: April 26, 2009

A spatial threshold for astrocyte calcium surge.

Justin Lines, Andres Baraibar, Carmen Nanclares

Biorxiv : the Preprint Server for Biology

|July 28, 2023

Summary

This summary is machine-generated.

Astrocytes exhibit a spatial threshold for calcium signal propagation. Surpassing this threshold triggers a calcium surge, influencing gliotransmitter release and synaptic modulation in the brain.

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Last Updated: Jul 21, 2025

Measuring Near Plasma Membrane and Global Intracellular Calcium Dynamics in Astrocytes

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Published on: April 26, 2009

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Imaging Intracellular Ca2+ Signals in Striatal Astrocytes from Adult Mice Using Genetically-encoded Calcium Indicators

Imaging Intracellular Ca2+ Signals in Striatal Astrocytes from Adult Mice Using Genetically-encoded Calcium Indicators

Published on: November 19, 2014

Area of Science:

Neuroscience
Cellular Biology
Astrocyte Biology

Background:

Astrocytes play a key role in brain function through bidirectional communication with neurons, with astrocyte calcium signaling being critical.
Astrocyte calcium signals can be localized or propagate throughout the cell (calcium surge), potentially regulating synapses via gliotransmitter release.
The spatial dynamics of astrocyte calcium signals and their impact on neuromodulation remain poorly understood.

Purpose of the Study:

To investigate the properties governing the spatial dynamics of astrocyte intracellular calcium signals.
To determine the conditions under which localized calcium signals propagate throughout the astrocyte.
To elucidate the role of astrocyte calcium signaling in regulating gliotransmission and synaptic activity.

Main Methods:

In vivo imaging of subcellular astrocyte calcium responses in mouse cortex during sensory stimulation.
Utilizing transgenic mice (IP mice) to investigate the role of type-2 IP3 receptors.
In situ electrophysiological recordings to assess gliotransmitter release.

Main Results:

Sensory-evoked astrocyte calcium responses initially remained localized but propagated to the entire cell upon surpassing a spatial threshold (>23% arborization activation).
Type-2 IP3 receptors were identified as essential for generating the astrocyte calcium surge.
A direct correlation was found between the spatial threshold of calcium signal propagation and gliotransmitter release.

Conclusions:

A fundamental spatial threshold governs astrocyte intracellular calcium signal propagation.
This threshold is dependent on astrocyte intrinsic properties and dictates the astrocyte's integration of synaptic activity.
The spatial threshold controls gliotransmitter release, thereby regulating the range of astrocyte neuromodulation of synapses.