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Updated: May 20, 2026
09:17
Subcellular Patch-clamp Recordings from the Somatodendritic Domain of Nigral Dopamine Neurons
Published on: November 2, 2016
Striatal dopamine release is triggered by synchronized activity in cholinergic interneurons
Sarah Threlfell1, Tatjana Lalic, Nicola J Platt
1Department of Physiology, Anatomy, and Genetics, University of Oxford, Oxford, UK.
Neuron
|July 17, 2012
Summary
Striatal dopamine release can be triggered by cholinergic interneurons, independent of dopamine neuron activity. This presynaptic mechanism offers new insights into dopamine signaling in goal-directed behaviors.
Area of Science:
- Neuroscience
- Neurobiology
- Neuropharmacology
Background:
- Striatal dopamine is crucial for goal-directed actions and is primarily studied through dopamine neuron activity.
- Understanding dopamine release mechanisms is key to deciphering its role in normal and pathological behaviors.
Purpose of the Study:
- To identify presynaptic mechanisms of dopamine release in the striatum.
- To investigate the role of cholinergic interneurons in directly triggering dopamine release, bypassing dopamine neuron firing.
Main Methods:
- Electrophysiological recordings of channelrhodopsin2-expressing cholinergic interneurons in striatal slices.
- Simultaneous detection of dopamine release using carbon-fiber microelectrodes.
- Optogenetic activation of cholinergic interneurons and thalamostriatal inputs.
Main Results:
- Activation of single cholinergic interneurons triggers dopamine release via nicotinic receptors on dopamine axons.
- This cholinergic-mediated dopamine release overrides ascending activity from dopamine neurons.
- Synchronized activation of cholinergic interneurons, induced by thalamostriatal inputs, also elicits dopamine release.
Conclusions:
- Synchronized cholinergic interneuron activity directly generates striatal dopamine signals.
- This mechanism provides a novel pathway for dopamine release, distinct from dopamine neuron firing.
- These findings expand our understanding of dopamine signaling and its implications for neurological disorders.
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