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Peer presence and familiarity as key factors to reduce cocaine intake in both rats and humans: an effect mediated by the subthalamic nucleus

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A Correction to this article was published on 12 April 2023

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Abstract

Rationale

Stimulant use, including cocaine, often occurs in a social context whose influence is important to understand to decrease intake and reduce associated harms. Although the importance of social influence in the context of drug addiction is known, there is a need for studies assessing its neurobiological substrate and for translational research.

Objectives

Here, we explored the influence of peer presence and familiarity on cocaine intake and its neurobiological basis. Given the regulatory role of the subthalamic nucleus (STN) on cocaine intake and emotions, we investigated its role on such influence of social context on cocaine intake.

Methods

We first compared cocaine consumption in various conditions (with no peer present or with peers with different characteristics: abstinent peer or drug-taking peer, familiar or not, cocaine-naive or not, dominant or subordinate) in rats (n = 90). Then, with a translational approach, we assessed the influence of the social context (alone, in the group, in a dyad with familiar or non-familiar peers) on drug intake in human drug users (n = 77).

Results

The drug consumption was reduced when a peer was present, abstinent, or drug-taking as well, and further diminished when the peer was non-familiar. The presence of a non-familiar and drug-naive peer represents key conditions to diminish cocaine intake. The STN lesion by itself reduced cocaine intake to the level reached in presence of a non-familiar naive peer and affected social cognition, positioning the STN as one neurobiological substrate of social influence on drug intake. Then, the human study confirmed the beneficial effect of social presence, especially of non-familiar peers.

Conclusion

Our results indirectly support the use of social interventions and harm reduction strategies and position the STN as a key cerebral structure to mediate these effects.

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Acknowledgements

Our thanks to Dany Palleressompoulle and Joel Baurberg for their technical support, as well as to the animal facilities’ personnel. Our thanks also to Silvia Rosellini and Chiara Calzolaio for help with statistical analyses and to Jude Sweeney and Maya Williams for the English revisions and editing of the manuscript.

Funding

This research was funded by CNRS, Aix-Marseille Université (AMU), the “Agence Nationale pour la Recherche” (ANR_2010-NEUR-005–01 in the framework of the ERA-Net NEURON to C.B. and supporting Y.P.), the “Fondation pour la Recherche Médicale” (FRM DPA20140629789 to C.B.), and the support of the A*MIDEX project (ANR-11-IDEX-0001–02) funded by the “Investissements d’Avenir” French Government program, managed by the French National Research Agency (ANR).

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Authors and Affiliations

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Contributions

E.G and C.V conducted most of the rats’ experiments, with the help of L.G and C.M; S.N and PR conducted the human experiments; C.B, C.V, E.G, P.C, and S.N wrote the paper; A.V, C.P, C.V, E.G, S.N, and P.R conducted the statistical analysis; C.M, C.V, and E.G conducted the histological analysis; C.B, C.V, E.G, K.D, P.H, and Y.P designed the rat experiment; CB, PR, PC, and SN designed the human questionnaire; CB, PC, and PH obtained the funding from A*MIDEX.

Corresponding author

Correspondence to Christelle Baunez.

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The authors declare no competing interests.

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This article belongs to a Special Issue on Nature vs. Nurture in Addiction Research

The original version of this article was revised: This article was originally published with the given names of all the authors set in initial letters.

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Giorla, E., Nordmann, S., Vielle, C. et al. Peer presence and familiarity as key factors to reduce cocaine intake in both rats and humans: an effect mediated by the subthalamic nucleus. Psychopharmacology 239, 1097–1113 (2022). https://doi.org/10.1007/s00213-021-06033-0

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  • DOI: https://doi.org/10.1007/s00213-021-06033-0

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