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Updated: Jan 23, 2026
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Imaging Dendritic Spines in Caenorhabditis elegans
Published on: September 27, 2021
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Fast calcium transients in dendritic spines driven by extreme statistics
Kanishka Basnayake1, David Mazaud2, Alexis Bemelmans3
1Computational Biology and Applied Mathematics, Institut de Biologie de l'École Normale Supérieure, Paris, France.
Plos Biology
|June 5, 2019
Summary
Fast calcium signals in cellular microdomains are analyzed using a novel mechanism involving the spine apparatus. This calcium-induced calcium release (CICR) relies on asymmetric distributions of receptors and pumps, offering insights into cellular signaling.
Area of Science:
- Neuroscience
- Cell Biology
- Biophysics
Background:
- Fast calcium transients (<10 ms) in cellular microdomains regulate critical cellular functions.
- Analyzing these rapid events is challenging but crucial for understanding cellular signaling.
- These transients influence trafficking, ATP production, and neuronal activity.
Purpose of the Study:
- To investigate the mechanism of fast calcium transients in dendritic spines.
- To elucidate the role of the spine apparatus (SA) in calcium signaling.
- To explore the underlying molecular basis of calcium-induced calcium release (CICR) in neuronal microdomains.
Main Methods:
- Computational modeling to predict the distribution of calcium channels and pumps.
- Experimental validation in cultured and slice hippocampal neurons.
- Analysis of fast calcium transients using advanced imaging techniques.
Main Results:
- A novel mechanism for calcium-induced calcium release (CICR) triggered by fast calcium ions at Ryanodyne receptors (RyRs) within the spine apparatus (SA).
- Asymmetric distribution of RyRs and sarco/ER calcium-ATPase (SERCA) pumps identified as key to the mechanism.
- Experimental confirmation of the predicted mechanism in hippocampal neurons.
Conclusions:
- The spine apparatus facilitates rapid calcium signaling through a mechanism dependent on particle statistics and asymmetric molecular distribution.
- This mechanism is likely applicable to various cellular microcompartments, including neuronal processes and astrocytes.
- Understanding this process provides new insights into the spatiotemporal control of cellular events by calcium.
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