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Reduced dopamine release in Dcc haploinsufficiency male mice abolishes the rewarding effects of cocaine but not those of morphine and ethanol

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Abstract

Rationale

The Netrin-1/DCC guidance cue pathway is critically involved in the adolescent organization of the mesocorticolimbic dopamine circuitry. Adult mice heterozygous for Dcc show reduced dopamine release in the nucleus accumbens in response to amphetamine and, in turn, blunted sensitivity to the rewarding effects of this drug.

Objective

Here, we tested whether the protective effects of Dcc haploinsufficiency are specific to stimulant drugs of abuse or instead extrapolate to opioids and ethanol.

Methods

We used the place preference paradigm to measure the rewarding effects of cocaine (20 mg/kg), morphine (5 or 10 mg/Kg), or ethanol (20%) in adult (PND 75) male Dcc haploinsufficient mice or their wild-type litter mates. In a second experiment, we compared in these two genotypes, in vivo dopamine release in the nucleus accumbens after a single i.p. injection of morphine (10 mg/kg).

Results

We found reduced morphine-induced dopamine release in the nucleus accumbens of Dcc haploinsufficient male mice, but, contrary to the effects of stimulant drugs, there is no effect of genotype on morphine-induced conditioned preference.

Conclusion

These findings show that reduced drug-induced mesolimbic dopamine in Dcc haploinsufficient male mice protects specifically against the rewarding effects of stimulant drugs, but not against the rewarding properties of morphine and ethanol. These results suggest that these drugs exert their rewarding effect via different brain circuits.

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Data availability

The data that support the findings of this study are available on request from the corresponding author.

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Acknowledgements

The authors dedicate this work to the late Dominique Nouel – an excellent and dedicated scientist, a kind mentor and colleague, and a generous and loyal friend.

Funding

The present research was supported by the National Institute on Drug Abuse (# DA037911 to C.F; # DA005010 and # DA048796 to B.L.K.), the Canadian Institutes of Health Research (# FRN 156272 to C.F.), the Natural Sciences and Engineering Research Council of Canada (# RGPIN-2020–04703 to C.F.), the Canada Fund for Innovation and the Canada Research Chairs to E.D. and B.L.K., and the University of Strasbourg initiative of Excellence (to E.D.). We thank Dr. Radu Avramescu for his helpful comments on the manuscript. We thank the NIDA Drug Supply Program (NIH) for providing the morphine.

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Correspondence to Cecilia Flores.

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The authors declare no competing interests.

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This article belongs to a Special Issue on Conditioned Determinants of Reward Seeking

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Darcq, E., Nouel, D., Hernandez, G. et al. Reduced dopamine release in Dcc haploinsufficiency male mice abolishes the rewarding effects of cocaine but not those of morphine and ethanol. Psychopharmacology 240, 637–646 (2023). https://doi.org/10.1007/s00213-022-06288-1

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  • DOI: https://doi.org/10.1007/s00213-022-06288-1

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