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Updated: Aug 8, 2025

Dopamine Release at Individual Presynaptic Terminals Visualized with FFNs
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The dopamine neuron synaptic map in the striatum.

Nao Chuhma1, Soo Jung Oh1, Stephen Rayport1

  • 1Department of Molecular Therapeutics, New York State Psychiatric Institute, New York, NY 10032, USA; Department of Psychiatry, Columbia University, New York, NY 10032, USA.

Cell Reports
|March 3, 2023
PubMed
Summary

Dopamine neurons use synaptic actions across the striatum, primarily targeting cholinergic interneurons. These actions vary by striatal region, influencing movement, cognition, and motivation.

Keywords:
CP: NeuroscienceGABAcholinergic interneuronsclusteringconnectomecotransmissionfast-spiking interneuronsglutamatespiny projection neurons

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Area of Science:

  • Neuroscience
  • Cellular Biology

Background:

  • Dopamine neurons in the brain project to the striatum, modulating key functions like movement, cognition, and motivation.
  • These neurons communicate through both volume transmission and rapid synaptic actions, including dopamine, glutamate, and GABA.
  • Understanding the precise synaptic reach and impact of dopamine neurons is crucial for deciphering striatal circuitry.

Purpose of the Study:

  • To map the spatial distribution and targets of dopamine neuron-evoked synaptic currents within the striatum.
  • To investigate the strength and type of synaptic actions (inhibitory/excitatory) across different striatal neuron populations.
  • To determine how dopamine neuron synaptic influence varies across distinct striatal subregions.

Main Methods:

  • Recorded dopamine-neuron-evoked postsynaptic currents in four major striatal neuron types.
  • Examined synaptic actions across the entire rostrocaudal and mediolateral extent of the striatum.
  • Analyzed synaptic current properties, including location, cell type specificity, and strength.

Main Results:

  • Inhibitory postsynaptic currents evoked by dopamine neurons are widespread throughout the striatum.
  • Excitatory postsynaptic currents are localized to specific regions: the medial nucleus accumbens and anterolateral-dorsal striatum.
  • Synaptic actions are weakest in the posterior striatum, with the strongest effects observed in cholinergic interneurons, mediating both inhibition and excitation.

Conclusions:

  • Dopamine neuron synaptic actions are broadly distributed in the striatum but exhibit regional specificity.
  • Cholinergic interneurons are a preferential target for dopamine neuron synaptic input, suggesting a key role in regulating their activity.
  • This detailed mapping reveals distinct functional subregions within the striatum based on dopamine neuron synaptic connectivity.