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A Single-Compartment Model of Calcium Dynamics in Nerve Terminals and Dendrites


Helmchen, Fritjof; Tank, David W (2015). A Single-Compartment Model of Calcium Dynamics in Nerve Terminals and Dendrites. Cold Spring Harbor Protocols, 2015(2):155-167.

Abstract

This introduction describes a single-compartment model of calcium dynamics that has been applied to fluorescence measurements of intracellular free calcium concentration ([Ca2+]i) changes in neurons. The model describes intracellular calcium handling under simplified conditions, for which analytical expressions for the amplitude and the time constants of [Ca2+]i changes can be explicitly derived. In particular, it reveals the dependence of the measured [Ca2+]i changes on the calcium indicator concentration. Applied to experimental data from small cells or subcellular compartments, the model equations have been extremely useful for obtaining quantitative information about essential parameters of Ca2+ influx, buffering, and clearance. We illustrate also several changes that occur when the basic assumptions do not hold (e.g., when calcium diffusion, dye saturation, or kinetic effects become significant). Finally, we discuss how the changes in calcium dynamics, which are explained by the model, have been exploited for measuring properties of calcium-driven reactions, such as those regulating short-term synaptic enhancement, vesicle recycling, and adaptation.

Abstract

This introduction describes a single-compartment model of calcium dynamics that has been applied to fluorescence measurements of intracellular free calcium concentration ([Ca2+]i) changes in neurons. The model describes intracellular calcium handling under simplified conditions, for which analytical expressions for the amplitude and the time constants of [Ca2+]i changes can be explicitly derived. In particular, it reveals the dependence of the measured [Ca2+]i changes on the calcium indicator concentration. Applied to experimental data from small cells or subcellular compartments, the model equations have been extremely useful for obtaining quantitative information about essential parameters of Ca2+ influx, buffering, and clearance. We illustrate also several changes that occur when the basic assumptions do not hold (e.g., when calcium diffusion, dye saturation, or kinetic effects become significant). Finally, we discuss how the changes in calcium dynamics, which are explained by the model, have been exploited for measuring properties of calcium-driven reactions, such as those regulating short-term synaptic enhancement, vesicle recycling, and adaptation.

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Additional indexing

Item Type:Journal Article, refereed, further contribution
Communities & Collections:04 Faculty of Medicine > Brain Research Institute
Dewey Decimal Classification:570 Life sciences; biology
610 Medicine & health
Language:English
Date:2 February 2015
Deposited On:23 Dec 2015 09:51
Last Modified:08 Dec 2017 16:10
Publisher:Cold Spring Harbor Laboratory Press
ISSN:1559-6095
Publisher DOI:https://doi.org/10.1101/pdb.top085910
PubMed ID:25646507

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