Neuronal circuits underlying acute morphine action on dopamine neurons.

Marion Jalabert 1 Romain Bourdy Julien Courtin 2 Pierre Veinante Olivier J Manzoni Michel Barrot 3 François Georges 4
1 INMED - Institut de neurobiologie de la Méditerranée
2 Physiopathologie du système nerveux central - Institut François Magendie
3 Institut des Neurosciences Cellulaires et Intégratives
4 IINS - Interdisciplinary Institute for Neuroscience
Abstract : Morphine is a highly potent analgesic with high addictive potential in specific contexts. Although dopamine neurons of the ventral tegmental area (VTA) are widely believed to play an essential role in the development of drug addiction, neuronal circuits underlying morphine action on dopamine neurons have not been fully elucidated. Here we combined in vivo electrophysiology, tract-tracing experiments, and targeted neuronal inactivation to dissect a neural circuit for acute morphine action on dopamine neurons in rats. We found that in vivo, morphine targets the GABAergic tail of the VTA, also called the rostromedial tegmental nucleus, to increase the firing of dopamine neurons through the activation of VTA μ opioid receptors expressed on tail of the VTA/rostromedial tegmental nucleus efferents. Our data also reveal that in the absence of VTA glutamatergic tone, there is no morphine-induced activation of dopamine neurons. These results define the anatomical organization and functional role of a neural circuit for acute morphine action on dopamine neurons.
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https://hal.archives-ouvertes.fr/hal-01160053
Contributeur : Francois Georges <>
Soumis le : jeudi 4 juin 2015 - 13:06:10
Dernière modification le : jeudi 7 février 2019 - 16:34:55

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Marion Jalabert, Romain Bourdy, Julien Courtin, Pierre Veinante, Olivier J Manzoni, et al.. Neuronal circuits underlying acute morphine action on dopamine neurons.. Proceedings of the National Academy of Sciences of the United States of America , National Academy of Sciences, 2011, 108 (39), pp.16446-50. ⟨10.1073/pnas.1105418108⟩. ⟨hal-01160053⟩

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