Abstract
The subthalamic nucleus (STN) is a key node in cortico-basal-ganglia thalamic circuits, guiding behavioral output through its position as an excitatory relay of the striatal indirect pathway and its direct connections with the cortex. There have been conflicting results regarding the role of the STN in addiction-related behavior to psychostimulants, and little is known with respect to the role of STN afferents. To address this, we used viral vectors to express DREADDs (Designer Receptors Exclusively Activated by Designer Drugs) in the STN of rats in order to bidirectionally manipulate STN activity during the induction of amphetamine sensitization. In addition, we used a Cre-recombinase dependent Gi/o-coupled DREADD approach to transiently inhibit afferents from ventral pallidum (a subcomponent of the striatal indirect pathway) or the prelimbic cortex (a subcomponent of the cortico-STN hyperdirect pathway). Despite inducing mild hyperactivity in non-drug controls, stimulation of STN neurons with Gq-DREADDs blocked the development and persistence of amphetamine sensitization as well as conditioned responding. In contrast, inhibition of STN neurons with Gi/o-DREADDs enhanced the induction of sensitization without altering its persistence or conditioned responding. Chemogenetic inhibition of afferents from ventral pallidum had no effect on amphetamine sensitization but blocked conditioned responding whereas chemogenetic inhibition of afferents from prelimbic cortex attenuated the persistence of sensitization as well as conditioned responding. These results suggest the STN and its afferents play complex roles in the regulation of amphetamine sensitization and highlight the need for further characterization of how integration of inputs within STN guide behavior.
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Acknowledgements
We thank Dr. John Neumaier and Dr. Michelle Kelly for providing the CAV2-Cre virus.
Funding
This work was supported by grants from the National Institute on Drug Abuse (R01DA036582 and R01DA036582-S1 to SMF).
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KGN, EY, and ES performed the behavioral and immunohistochemical experiments. KGN and SMF designed the experiments and wrote the manuscript.
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Nakata, K.G., Yin, E., Sutlief, E. et al. Chemogenetic modulation reveals distinct roles of the subthalamic nucleus and its afferents in the regulation of locomotor sensitization to amphetamine in rats. Psychopharmacology 239, 353–364 (2022). https://doi.org/10.1007/s00213-021-05985-7
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DOI: https://doi.org/10.1007/s00213-021-05985-7