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Adaptor protein-3 produces synaptic vesicles that release phasic dopamine.

Shweta Jain1,2, Andrew G Yee3, James Maas1,2

  • 1Department of Physiology, University of California School of Medicine, San Francisco, CA 94143.

Proceedings of the National Academy of Sciences of the United States of America
|October 9, 2023
PubMed
Summary

Adaptor protein-3 (AP-3) and VPS41 enhance dopamine neuron function by directing vesicular monoamine transporter 2 (VMAT2) to axons. This promotes phasic dopamine release crucial for reinforcement learning, especially at high firing frequencies.

Keywords:
adaptor protein-3 (AP-3)phasic dopaminereinforcement learningsynaptic vesiclesvesicular monoamine transporter 2 (VMAT2)

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Area of Science:

  • Neuroscience
  • Cell Biology

Background:

  • Midbrain dopamine neurons mediate reinforcement learning via phasic dopamine release.
  • High-frequency neuronal firing often leads to synaptic depression due to synaptic vesicle depletion.

Purpose of the Study:

  • Investigate the mechanisms underlying increased dopamine release at high frequencies.
  • Determine the role of adaptor protein-3 (AP-3) and VPS41 in dopamine release and reinforcement learning.

Main Methods:

  • Utilized genetic manipulation to study the function of AP-3 and VPS41 in dopamine neurons.
  • Assessed axonal dopamine release and synaptic vesicle properties.
  • Examined reinforcement learning behavior in genetically modified models.

Main Results:

  • AP-3 and VPS41 target vesicular monoamine transporter 2 (VMAT2) to axons, promoting dopamine release.
  • These proteins generate synaptic vesicles (SVs) responsive to high-frequency stimulation.
  • Conditional inactivation of VPS41 impaired reinforcement learning, specifically affecting release frequency dependence.

Conclusions:

  • AP-3 and VPS41 are critical for the axonal targeting of VMAT2 and the production of specialized SVs.
  • These mechanisms enable the phasic dopamine release necessary for effective reinforcement learning, particularly during high-frequency neuronal activity.