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Charbogne P, Gardon O, Martín-García E, Keyworth HL, Matsui A, Mechling AE, Bienert T, Nasseef T, Robé A, Moquin L, Darcq E, Ben Hamida S, Robledo P, Matifas A, Befort K, Gavériaux-Ruff C, Harsan LA, Von Everfeldt D, Hennig J, Gratton A, Kitchen I, Bailey A, Alvarez VA, Maldonado R, Kieffer BL. Mu Opioid Receptors in Gamma-Aminobutyric Acidergic Forebrain Neurons Moderate Motivation for Heroin and Palatable Food. Biol Psychiatry 2017; 81:778-788. [PMID: 28185645 PMCID: PMC5386808 DOI: 10.1016/j.biopsych.2016.12.022] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 11/12/2016] [Accepted: 12/12/2016] [Indexed: 12/13/2022]
Abstract
BACKGROUND Mu opioid receptors (MORs) are central to pain control, drug reward, and addictive behaviors, but underlying circuit mechanisms have been poorly explored by genetic approaches. Here we investigate the contribution of MORs expressed in gamma-aminobutyric acidergic forebrain neurons to major biological effects of opiates, and also challenge the canonical disinhibition model of opiate reward. METHODS We used Dlx5/6-mediated recombination to create conditional Oprm1 mice in gamma-aminobutyric acidergic forebrain neurons. We characterized the genetic deletion by histology, electrophysiology, and microdialysis; probed neuronal activation by c-Fos immunohistochemistry and resting-state functional magnetic resonance imaging; and investigated main behavioral responses to opiates, including motivation to obtain heroin and palatable food. RESULTS Mutant mice showed MOR transcript deletion mainly in the striatum. In the ventral tegmental area, local MOR activity was intact, and reduced activity was only observed at the level of striatonigral afferents. Heroin-induced neuronal activation was modified at both sites, and whole-brain functional networks were altered in live animals. Morphine analgesia was not altered, and neither was physical dependence to chronic morphine. In contrast, locomotor effects of heroin were abolished, and heroin-induced catalepsy was increased. Place preference to heroin was not modified, but remarkably, motivation to obtain heroin and palatable food was enhanced in operant self-administration procedures. CONCLUSIONS Our study reveals dissociable MOR functions across mesocorticolimbic networks. Thus, beyond a well-established role in reward processing, operating at the level of local ventral tegmental area neurons, MORs also moderate motivation for appetitive stimuli within forebrain circuits that drive motivated behaviors.
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Affiliation(s)
- Pauline Charbogne
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/Université de Strasbourg, 1 rue Laurent Fries, 67404 Illkirch, France,Douglas Mental Health Institute, Department of Psychiatry, McGill University, 6875 boulevard LaSalle, H4H 1R3 Montreal, QC, Canada
| | - Olivier Gardon
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/Université de Strasbourg, 1 rue Laurent Fries, 67404 Illkirch, France
| | - Elena Martín-García
- Departament de Ciencies Experimentals i de la Salut, Universitat Pompeu Fabra, PRBB, C/Dr. Aiguader 88, 08003 Barcelona, Spain
| | - Helen L. Keyworth
- Faculty of Health and Medical Sciences, AY Building, University of Surrey, Guildford, Surrey GU2 7XH, UK
| | - Aya Matsui
- Section on Neuronal Structure, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD, USA
| | - Anna E. Mechling
- Department of Radiology, Medical Physics, Medical Center – University of Freiburg, Faculty of Medicine, University of Freiburg, Germany,Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Thomas Bienert
- Department of Radiology, Medical Physics, Medical Center – University of Freiburg, Faculty of Medicine, University of Freiburg, Germany
| | - Taufiq Nasseef
- Douglas Mental Health Institute, Department of Psychiatry, McGill University, 6875 boulevard LaSalle, H4H 1R3 Montreal, QC, Canada
| | - Anne Robé
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/Université de Strasbourg, 1 rue Laurent Fries, 67404 Illkirch, France
| | - Luc Moquin
- Douglas Mental Health Institute, Department of Psychiatry, McGill University, 6875 boulevard LaSalle, H4H 1R3 Montreal, QC, Canada
| | - Emmanuel Darcq
- Douglas Mental Health Institute, Department of Psychiatry, McGill University, 6875 boulevard LaSalle, H4H 1R3 Montreal, QC, Canada
| | - Sami Ben Hamida
- Douglas Mental Health Institute, Department of Psychiatry, McGill University, 6875 boulevard LaSalle, H4H 1R3 Montreal, QC, Canada
| | - Patricia Robledo
- Departament de Ciencies Experimentals i de la Salut, Universitat Pompeu Fabra, PRBB, C/Dr. Aiguader 88, 08003 Barcelona, Spain
| | - Audrey Matifas
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/Université de Strasbourg, 1 rue Laurent Fries, 67404 Illkirch, France
| | - Katia Befort
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/Université de Strasbourg, 1 rue Laurent Fries, 67404 Illkirch, France
| | - Claire Gavériaux-Ruff
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/Université de Strasbourg, 1 rue Laurent Fries, 67404 Illkirch, France
| | - Laura-Adela Harsan
- Department of Radiology, Medical Physics, Medical Center – University of Freiburg, Faculty of Medicine, University of Freiburg, Germany,Laboratory of Engineering, Informatics and Imaging (ICube), Integrative multimodal imaging in healthcare (IMIS), UMR 7357, University of Strasbourg, France,University Hospital Strasbourg, Department of Biophysics and Nuclear Medicine, Strasbourg, France
| | - Dominik Von Everfeldt
- Department of Radiology, Medical Physics, Medical Center – University of Freiburg, Faculty of Medicine, University of Freiburg, Germany
| | - Jurgen Hennig
- Department of Radiology, Medical Physics, Medical Center – University of Freiburg, Faculty of Medicine, University of Freiburg, Germany
| | - Alain Gratton
- Douglas Mental Health Institute, Department of Psychiatry, McGill University, 6875 boulevard LaSalle, H4H 1R3 Montreal, QC, Canada
| | - Ian Kitchen
- Faculty of Health and Medical Sciences, AY Building, University of Surrey, Guildford, Surrey GU2 7XH, UK
| | - Alexis Bailey
- Faculty of Health and Medical Sciences, AY Building, University of Surrey, Guildford, Surrey GU2 7XH, UK
| | - Veronica A. Alvarez
- Section on Neuronal Structure, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD, USA
| | - Rafael Maldonado
- Departament de Ciencies Experimentals i de la Salut, Universitat Pompeu Fabra, PRBB, C/Dr. Aiguader 88, 08003 Barcelona, Spain
| | - Brigitte L. Kieffer
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/Université de Strasbourg, 1 rue Laurent Fries, 67404 Illkirch, France,Douglas Mental Health Institute, Department of Psychiatry, McGill University, 6875 boulevard LaSalle, H4H 1R3 Montreal, QC, Canada,Corresponding author. Douglas Mental Health Institute, Department of Psychiatry, McGill, University, 6875 boulevard LaSalle, H4H 1R3 Montreal, QC, Canada, Phone: 514 761-6131 ext.: 3175; fax: 514 762-3033,
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