Dopamine neuron stimulation induces context-dependent abnormal involuntary movements in healthy rats

Hunter, Julia; Bova, Alexandra; Stevens, Andrew; Leventhal, Daniel K.

doi:10.1016/j.isci.2022.103974

Cited by 4 publications

(1 citation statement)

References 23 publications

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“…On shorter timescales corresponding to phasic signaling, however, the evidence is mixed. Several studies find that dopamine neurons increase their activity at or prior to movement onset, and/or dopamine neuron stimulation causes rapid movement initiation (Howe and Dombeck, 2016; Coddington and Dudman, 2018; da Silva et al, 2018; Saunders et al, 2018; Hunter et al, 2022). Others find that the primary dopamine neuron response to movement initiation is a firing pause (Dodson et al, 2016) or decrease in striatal dopamine or terminal activation (Tsutsui-Kimura et al, 2020; Markowitz et al, 2023).…”

Section: Discussionmentioning

confidence: 99%

Striatal dopamine contributions to skilled motor learning

Phillips,

Myers,

Leventhal

et al. 2024

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Coordinated multi-joint limb and digit movements - “manual dexterity” - underlie both specialized skills (e.g., playing the piano) and more mundane tasks (e.g., tying shoelaces). Impairments in dexterous skill cause significant disability, as occurs with motor cortical injury, Parkinson’s Disease, and a range of other pathologies. Clinical observations, as well as basic investigations, suggest that cortico-striatal circuits play a critical role in learning and performing dexterous skills. Furthermore, dopaminergic signaling in these regions is implicated in synaptic plasticity and motor learning. Nonetheless, the role of striatal dopamine signaling in skilled motor learning remains poorly understood. Here, we use fiber photometry paired with a genetically encoded dopamine sensor to investigate striatal dopamine release as mice learn and perform a skilled reaching task. Dopamine rapidly increases during a skilled reach and peaks near pellet consumption. In dorsolateral striatum, dopamine dynamics are faster than in dorsomedial and ventral striatum. Across training, as reaching performance improves, dopamine signaling shifts from pellet consumption to cues that predict pellet availability, particularly in medial and ventral areas of striatum. Furthermore, performance prediction errors are present across the striatum, with reduced dopamine release after an unsuccessful reach. These findings show that dopamine dynamics during skilled motor behaviors change with learning and are differentially regulated across striatal subregions.

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