Dual Roles for Nucleus Accumbens Core Dopamine D1-Expressing Neurons Projecting to the Substantia Nigra Pars Reticulata in Limbic and Motor Control in Male Mice.

Publisher: Society for Neuroscience Country of Publication: United States NLM ID: 101647362 Publication Model: Electronic-Print Cited Medium: Internet ISSN: 2373-2822 (Electronic) Linking ISSN: 23732822 NLM ISO Abbreviation: eNeuro Subsets: MEDLINE

Original Publication: [Washington, DC] : Society for Neuroscience, [2014]-

Nucleus Accumbens*/metabolism ; Pars Reticulata*/metabolism; Mice ; Male ; Animals ; Dopamine/metabolism ; Dopaminergic Neurons/metabolism ; Learning ; Receptors, Dopamine D1/metabolism ; Mice, Inbred C57BL

The nucleus accumbens (NAc) is a critical component of a limbic basal ganglia circuit that is thought to play an important role in decision-making and the processing of rewarding stimuli. As part of this circuit, dopamine D1 receptor-expressing medium spiny neurons (D1-MSNs) of the NAc core are known to send a major projection to the substantia nigra pars reticulata (SNr). However, the functional role of this SNr-projecting NAc D1-MSN (NAc ^D1-MSN -SNr) pathway is still largely uncharacterized. Moreover, as the SNr is thought to belong to both limbic and motor information-processing basal ganglia loops, it is possible that the NAc ^D1-MSN -SNr pathway may be able to influence both limbic and motor functions. In this study, we investigated the effect of optogenetic manipulation of the NAc ^D1-MSN -SNr pathway on reward-learning and locomotor behavior in male mice. Stimulation of the axon terminals of NAc core D1-MSNs in the SNr induced a preference for a laser-paired location, self-stimulation via a laser-paired lever, and augmented instrumental responding for a liquid reward-paired lever. Additionally, stimulation was observed to increase locomotor behavior when delivered bilaterally and induced contralateral turning behavior when delivered unilaterally. However, interestingly, inhibition of this pathway did not alter either reward-related behaviors or locomotion. These findings indicate that the NAc ^D1-MSN -SNr pathway is able to control both reward learning and motor behaviors.
Competing Interests: The authors declare no competing financial interests.
(Copyright © 2023 Attachaipanich et al.)

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Keywords: basal ganglia; dopamine; motor; nucleus accumbens; reward; substantia nigra

VTD58H1Z2X (Dopamine)
0 (Receptors, Dopamine D1)

Date Created: 20230526 Date Completed: 20230608 Latest Revision: 20230612

20230612

PMC10249946

10.1523/ENEURO.0082-23.2023

37236787