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Related Experiment Video

Updated: Jun 27, 2026

Two-photon Calcium Imaging in Neuronal Dendrites in Brain Slices

Two-photon Calcium Imaging in Neuronal Dendrites in Brain Slices

Published on: March 15, 2018

Spine neck plasticity controls postsynaptic calcium signals through electrical compartmentalization.

Asa Grunditz¹, Niklaus Holbro, Lei Tian

¹Friedrich Miescher Institute, Maulbeerstrasse 66, CH-4058 Basel, Switzerland.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience

|December 17, 2008

Summary

Dendritic spines dynamically regulate electrical compartmentalization. Spine neck resistance increases with depolarization, enhancing calcium influx crucial for synaptic plasticity.

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Voltage-sensitive Dye Recording from Axons, Dendrites and Dendritic Spines of Individual Neurons in Brain Slices

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Published on: November 29, 2012

Area of Science:

Neuroscience
Cellular biology
Synaptic plasticity

Background:

Dendritic spines are proposed as electrical compartments for local synaptic signal processing.
Previous estimates suggested insufficient electrical decoupling between spine heads and parent dendrites.

Purpose of the Study:

To investigate the dynamic regulation of electrical compartmentalization in dendritic spines.
To understand the role of spine necks in controlling local depolarization and calcium influx.

Main Methods:

Experiments conducted in acute hippocampal slices.
Utilized N-methyl-D-aspartate (NMDA) receptors as voltage sensors.
Measured electrical coupling and calcium influx under varying postsynaptic depolarization levels.

Main Results:

Spine compartmentalization was initially weak but increased significantly upon postsynaptic depolarization.
Spine necks were found to regulate both diffusional coupling and local spine head depolarization.
High-resistance spine necks facilitated calcium influx via NMDA receptors and R-type calcium channels with presynaptic activity alone.

Conclusions:

Spine neck plasticity dynamically regulates electrical compartmentalization.
This dynamic process controls calcium influx into spines, a critical mechanism for synaptic plasticity.