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Psychopharmacology

, Volume 236, Issue 7, pp 2069–2082 | Cite as

Lack of correlation between the activity of the mesolimbic dopaminergic system and the rewarding properties of pregabalin in mouse

  • Basile Coutens
  • Lionel Mouledous
  • Manta Stella
  • Claire Rampon
  • Maryse Lapeyre-Mestre
  • Anne Roussin
  • Bruno P. GuiardEmail author
  • Emilie Jouanjus
Original Investigation

Abstract

Rationale

Pregabalin is a psychoactive drug indicated in the treatment of epilepsy, neuropathic pain, and generalized anxiety disorders. Pregabalin acts on different neurotransmission systems by inactivating the alpha2-delta subunit of voltage-gated calcium channels. In light of this pharmacological property, the hypothesis has been raised that pregabalin may regulate the mesolimbic dopamine pathway and thereby display a potential for misuse or abuse as recently observed in humans. Although some preclinical data support this possibility, the rewarding properties of gabapentinoid are still a matter for debate.

Objective

The aim of this work was to evaluate the rewarding properties of pregabalin and to determine its putative mechanism of action in healthy mice.

Results

Pregabalin alone (60 mg/kg; s.c.) produced a rewarding effect in the conditioned place preference (CPP) test albeit to a lower extent than cocaine (30 mg/kg; s.c.). Interestingly, when assessing locomotor activity in the CPP, the PGB60 group, similarly to the cocaine group, showed an increased locomotor activity. In vivo single unit extracellular recording showed that pregabalin had mixed effects on dopamine (DA) neuronal activity in the ventral tegmental area since it decreased the activity of 50% of neurons and increased 28.5% of them. In contrast, cocaine decreased 75% of VTA DA neuronal activity whereas none of the neurons were activated. Intracerebal microdialysis was then conducted in awake freely mice to determine to what extent such electrophysiological parameters influence the extracellular DA concentrations ([DA]ext) in the nucleus accumbens. Although pregabalin failed to modify this parameter, cocaine produced a robust increase (800%) in [DA]ext.

Conclusions

Collectively, these electrophysiological and neurochemical experiments suggest that the rewarding properties of pregabalin result from a different mode of action than that observed with cocaine. Further experiments are warranted to determine whether such undesirable effects can be potentiated under pathological conditions such as neuropathic pain, mood disorders, or addiction and to identify the key neurotransmitter system involved.

Keywords

Rewarding properties Pregabalin Dopamine VTA Nucleus accumbens 

Notes

Acknowledgments

The authors greatly acknowledge “the Mouse Behavioural Phenotyping Core” (Center of Integrative Biology, Toulouse, France) for its expertise and assistance in setting up behavioral apparatus and procedures.

Funding

This independent study did not receive resources from pharmaceutical companies and was funded by the academic collaborating laboratories.

Compliance with ethical standards

All experiments were carried out in accordance with the European guidelines for the care of laboratory animals (European Communities Council Directive 86/609/ECC) and approved by the local Ethics Committee and the French Ministry of Education and Research (APAFIS#6659-2016090512114815 v3).

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

213_2019_5198_Fig9_ESM.png (578 kb)
Supplemental Figure 1

Individual distribution of the percentage of time spent in the drug-paired compartment before (D0) and after (D5) conditioning in response to cocaine (30 mg/kg, s.c.) (A) or pregabalin (PGB 60 mg/kg, s.c.). (PNG 577 kb)

213_2019_5198_MOESM1_ESM.tiff (3 mb)
High resolution image (TIFF 3072 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Basile Coutens
    • 1
  • Lionel Mouledous
    • 1
  • Manta Stella
    • 1
  • Claire Rampon
    • 1
  • Maryse Lapeyre-Mestre
    • 2
  • Anne Roussin
    • 2
  • Bruno P. Guiard
    • 1
    • 3
    • 4
    Email author
  • Emilie Jouanjus
    • 2
  1. 1.Centre de Recherches sur la Cognition Animale (CRCA), Centre de Biologie Intégrative (CBI)Université Paul Sabatier Toulouse IIIToulouse, Cedex 09France
  2. 2.Pharmacoepidemiology Research UnitINSERM-Université Toulouse 3, UMR 1027ToulouseFrance
  3. 3.Faculté de PharmacieUniversité Paris Sud, Université Paris-SaclayChatenay-MalabryFrance
  4. 4.CNRS UMR-5169, UPSToulouseFrance

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