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Related Experiment Video

Updated: Sep 28, 2025

Dopamine Release at Individual Presynaptic Terminals Visualized with FFNs

Dopamine Release at Individual Presynaptic Terminals Visualized with FFNs

Published on: August 31, 2009

Synaptotagmins 1 and 7 Play Complementary Roles in Somatodendritic Dopamine Release.

Takuya Hikima¹, Paul Witkovsky¹, Latika Khatri²

¹Department of Neurosurgery, New York University Grossman School of Medicine, New York, New York 10016.

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

|April 1, 2022

Summary

Synaptotagmin 7 (Syt7) drives somatodendritic dopamine release and its calcium sensitivity. Synaptotagmin 1 (Syt1) contributes to tonic release, with both proteins playing complementary roles in dopamine neuron function.

Keywords:

D2 dopamine receptors GIRK channels autoreceptors exocytosis substantia nigra synaptotagmin 1

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Published on: June 26, 2018

Area of Science:

Neuroscience
Molecular Biology
Neurochemistry

Background:

The molecular basis of somatodendritic dopamine (DA) release is not fully understood.
Previous research indicated DA release in low extracellular calcium ([Ca2+]o).
Synaptotagmin proteins are calcium sensors involved in neurotransmitter release.

Purpose of the Study:

To investigate the role of synaptotagmin 7 (Syt7) in somatodendritic DA release.
To determine the calcium (Ca2+) dependence of DA release mediated by Syt7.
To explore the interplay between Syt7 and Syt1 in DA release.

Main Methods:

Whole-cell recording in midbrain slices from mice.
Measurement of DA-dependent D2 receptor-mediated inhibitory currents (D2ICs).
Application of antibodies against Syt7 and Syt1.
Assessment of DA release under varying extracellular Ca2+ concentrations.

Main Results:

Antibody to Syt7 reduced evoked D2ICs, confirming Syt7's role in DA release.
Syt7 mediates DA release in submillimolar [Ca2+]o; this sensitivity was lost in Syt7 knockout mice.
Syt1 substituted for Syt7 in phasic release in Syt7 knockouts and mediated tonic release in wild-type mice.

Conclusions:

Syt7 is a key high-affinity Ca2+ sensor for phasic somatodendritic DA release.
Syt1 contributes to tonic somatodendritic DA release and can compensate for Syt7.
Syt7 and Syt1 have distinct yet complementary roles in regulating DA release from midbrain neurons.