Abstract
Introduction
Locomotor sensitization, defined as the progressive and enduring enhancement of the motor stimulant effects elicited by repeated exposure to drugs of abuse, is the consequence of drug-induced cellular neuroadaptations that likely contribute to addictive behavior. Neuroadaptations within the dopaminergic system have been shown to be involved both in the induction phase and in the long-term expression phase of sensitization upon drug readministration after withdrawal.
Materials and methods
Mice lacking the dopamine transporter (DAT-KO) were used to test the effect of constitutive hyperdopaminergia on the durability of behavioral sensitization to both cocaine and ethanol. The effect of the DAT mutation was simultaneously tested on two inbred genetic backgrounds, C57Bl/6 and DBA/2, chosen for their contrasting addiction-related phenotypes, as well as on the hybrid F1 offspring of a cross between C57Bl/6 and DBA/2 congenic strains.
Results and discussion
In spite of the absence of the DAT, mutant mice were able to develop long-term expression of sensitization to cocaine. Compared to their wild-type littermates, DAT-KO mice exhibited a markedly increased acute ethanol-evoked locomotor activity and developed stronger behavioral sensitization to ethanol during both induction and long-term expression phases. Interestingly, this increased ethanol-induced sensitization was potentiated by the DBA/2 genetic background.
Conclusion
These findings, showing that DAT deletion facilitates sensitization, suggest a cross-sensitization-like effect between genetic- and pharmacological-induced hyperdopaminergia.
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Acknowledgements
We are grateful to Drs. Catalina Betancur and Marie-Pascale Martres for helpful comments on the manuscript. We thank Philippe Chevalier (in memoriam) and Laurent Hillard for animal care. This work was supported by INSERM, Action Thématique Concertée (ATC) Alcool, and the Fondation pour la Recherche Médicale. EM was supported by a fellowship from the Ministère de l’Eduction Nationale, de la Recherche et de la Technologie.
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Morice, E., Denis, C., Giros, B. et al. Evidence of long-term expression of behavioral sensitization to both cocaine and ethanol in dopamine transporter knockout mice. Psychopharmacology 208, 57–66 (2010). https://doi.org/10.1007/s00213-009-1707-0
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DOI: https://doi.org/10.1007/s00213-009-1707-0