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Related Experiment Video

Updated: Jun 14, 2026

Dopamine Release at Individual Presynaptic Terminals Visualized with FFNs

Dopamine Release at Individual Presynaptic Terminals Visualized with FFNs

Published on: August 31, 2009

The low synaptic release probability in vivo.

J Gerard G Borst¹

¹Department of Neuroscience, Erasmus MC, University Medical Center Rotterdam, 3015 GE Rotterdam, The Netherlands. g.borst@erasmusmc.nl

Trends in Neurosciences

|April 8, 2010

Summary

This summary is machine-generated.

Synaptic release probability is much lower in vivo than in vitro. This difference in neurotransmitter release may be due to factors like maturation, spontaneous activity, calcium levels, and tonic inhibition.

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Area of Science:

Neuroscience
Cellular Biology
Neurophysiology

Background:

Synaptic release probability (SRP) is critical for neural communication.
In vitro studies suggest high SRP (around 0.5), but in vivo data implies lower values.

Purpose of the Study:

To investigate the discrepancy in SRP measurements between in vitro and in vivo conditions.
To understand the physiological regulation of neurotransmitter release at synapses.

Main Methods:

Comparison of synaptic potential characteristics in cultured neurons/slices versus in vivo recordings.
Analysis of factors potentially influencing SRP in vivo.

Main Results:

In vivo synaptic potentials show less dependence on recent activity, indicating lower SRP.
Discrepancies may stem from maturational differences, higher spontaneous activity, lower extracellular calcium, and tonic inhibition in vivo.

Conclusions:

Presynaptic action potentials trigger neurotransmitter release less frequently in vivo under physiological conditions.
In vitro preparations may overestimate synaptic release probability compared to the in vivo environment.