1
|
Söderpalm B, Ericson M. Alcohol and the dopamine system. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2024; 175:21-73. [PMID: 38555117 DOI: 10.1016/bs.irn.2024.02.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/02/2024]
Abstract
The mesolimbic dopamine pathway plays a major role in drug reinforcement and is likely involved also in the development of drug addiction. Ethanol, like most addictive drugs, acutely activates the mesolimbic dopamine system and releases dopamine, and ethanol-associated stimuli also appear to trigger dopamine release. In addition, chronic exposure to ethanol reduces the baseline function of the mesolimbic dopamine system. The molecular mechanisms underlying ethanol´s interaction with this system remain, however, to be unveiled. Here research on the actions of ethanol in the mesolimbic dopamine system, focusing on the involvement of cystein-loop ligand-gated ion channels, opiate receptors, gastric peptides and acetaldehyde is briefly reviewed. In summary, a great complexity as regards ethanol´s mechanism(s) of action along the mesolimbic dopamine system has been revealed. Consequently, several new targets and possibilities for pharmacotherapies for alcohol use disorder have emerged.
Collapse
Affiliation(s)
- Bo Söderpalm
- Addiction Biology Unit, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden; Department of Addiction and Dependency, Sahlgrenska University Hospital, Gothenburg, Sweden.
| | - Mia Ericson
- Addiction Biology Unit, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| |
Collapse
|
2
|
Pati D, Lee SI, Conley SY, Sides T, Boyt KM, Hunker AC, Zweifel LS, Kash TL. Dopamine D2 receptors in the bed nucleus of the stria terminalis modulate alcohol-related behaviors. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.06.13.544820. [PMID: 37398115 PMCID: PMC10312666 DOI: 10.1101/2023.06.13.544820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/04/2023]
Abstract
Dysregulation of the dopamine (DA) system is a hallmark of substance abuse disorders, including alcohol use disorder (AUD). Of the DA receptor subtypes, the DA D2 receptors (D2Rs) play a key role in the reinforcing effects of alcohol. D2Rs are expressed in numerous brain regions associated with the regulation of appetitive behaviors. One such region is the bed nucleus of the stria terminalis (BNST), which has been linked to the development and maintenance of AUD. Recently, we identified alcohol withdrawal-related neuroadaptations in the periaqueductal gray/dorsal raphe to BNST DA circuit in male mice. However, the role of D2R-expressing BNST neurons in voluntary alcohol consumption is not well characterized. In this study, we used a CRISPR-Cas9-based viral approach, to selectively reduce the expression of D2Rs in BNST VGAT neurons and interrogated the impact of BNST D2Rs in alcohol-related behaviors. In male mice, reduced D2R expression potentiated the stimulatory effects of alcohol and increased voluntary consumption of 20% w/v alcohol in a two-bottle choice intermittent access paradigm. This effect was not specific to alcohol, as D2R deletion also increased sucrose intake in male mice. Interestingly, cell-specific deletion of BNST D2Rs in female mice did not alter alcohol-related behaviors but lowered the threshold for mechanical pain sensitivity. Collectively, our findings suggest a role for postsynaptic BNST D2Rs in the modulation of sex-specific behavioral responses to alcohol and sucrose.
Collapse
Affiliation(s)
- Dipanwita Pati
- Bowles Center for Alcohol Studies, Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Sophia I. Lee
- Bowles Center for Alcohol Studies, Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Sara Y. Conley
- Bowles Center for Alcohol Studies, Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Curriculum of Neuroscience, University of North Carolina School of Medicine, Chapel Hill, NC, USA
| | - Tori Sides
- Bowles Center for Alcohol Studies, Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Kristen M. Boyt
- Bowles Center for Alcohol Studies, Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Avery C. Hunker
- Department of Pharmacology, University of Washington, Seattle, WA, USA
| | - Larry S. Zweifel
- Department of Pharmacology, University of Washington, Seattle, WA, USA
- Department of Psychiatry & Behavioral Sciences, University of Washington, Seattle, WA, USA
| | - Thomas L. Kash
- Bowles Center for Alcohol Studies, Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| |
Collapse
|
3
|
Early-life low-level lead exposure alters anxiety-like behavior, voluntary alcohol consumption and AC5 protein content in adult male and female C57BL/6 J mice. Neurotoxicol Teratol 2023; 95:107149. [PMID: 36539102 DOI: 10.1016/j.ntt.2022.107149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 12/14/2022] [Accepted: 12/14/2022] [Indexed: 12/23/2022]
Abstract
Despite efforts to eradicate sources of environmental lead (Pb), children, predominately in lower socioeconomic areas, are still frequently exposed to unsafe levels of Pb from soils, dust, and water. Human studies suggest that Pb exposure is associated with altered drug consumption in adults; however, there is limited research at comparable exposure levels (blood Pb levels <10 μg/dL). To model how early-life, low-level Pb exposure affects alcohol consumption in adulthood, we exposed postnatal day (PND) 21 C57Bl/6 J mice to either 30 ppm or 0 ppm Lead (IV) Acetate in distilled water until PND 42, and testing began in adulthood. We predicted that mice with early-life Pb exposure would exhibit greater anxiety-like behavior and consume more alcohol in a three-week Drinking-in-the-Dark procedure (20% v/v) and a 24-h two-bottle choice procedure (10% v/v). We also predicted that Pb exposure would decrease whole-brain content of Adenylate Cyclase-5 (AC5), a protein linked to anxiety-like behaviors and alcohol drinking. There was no difference in limited-access binge-like consumption between exposure groups; however, Pb-exposed mice displayed higher two-bottle choice alcohol intake and preference. Furthermore, Pb-exposed mice exhibited greater anxiety-like behaviors in experiments conducted before an alcohol drinking history but not after. Finally, Pb-exposed mice exhibited an upregulation of whole-brain AC5 protein content. However, this difference was not found in the nucleus accumbens, dorsomedial or dorsolateral striatum. These findings conclude that early-life Pb exposure alters voluntary alcohol consumption and whole-brain AC5 protein content in adulthood. Future studies are necessary to further understand the mechanism behind how Pb exposure alters alcohol intake.
Collapse
|
4
|
Ducasse D, Dubois J, Jaussent I, Azorin JM, Etain B, Gard S, Henry C, Bougerol T, Kahn JP, Aubin V, Bellivier F, Belzeaux R, Dubertret C, Dubreucq J, Llorca PM, Loftus J, Passerieux C, Polosan M, Samalin L, Leboyer M, Yrondi A, Bennabi D, Haffen E, Maruani J, Allauze E, Camus V, D'Amato T, Doumy O, Holtzmann J, Lançon C, Moliere F, Moirand R, Richieri RM, Horn M, Schmitt L, Stephan F, Genty JB, Vaiva G, Walter M, El-Hage W, Aouizerate B, Olié E, Courtet P. Association between anhedonia and suicidal events in patients with mood disorders: A 3-year prospective study. Depress Anxiety 2021; 38:17-27. [PMID: 32652874 DOI: 10.1002/da.23072] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 05/30/2020] [Accepted: 06/13/2020] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND As almost all mental disorders are associated with increased suicidal-related behavior, anhedonia might be a trans-diagnostic dimension to target for suicide prevention. METHODS For this 3-year-long prospective study, 2,839 outpatients with mood disorders were recruited. They were divided in: (a) two groups according to the occurrence or not of suicidal ideation during the follow-up, and (b) two groups according to the occurrence or not of suicide attempts during the follow-up. Anhedonia was assessed using a composite score (the French version of the 14-item Snaith-Hamilton Pleasure Scale and item 13 of the Quick Inventory of Depressive Symptomatology scale) at inclusion and at 6, 12, 24, and 36 months after inclusion. RESULTS Patients with mood disorders and anhedonia at least at one follow-up visit had a 1.4-fold higher risk of suicidal ideation (adjusted odds ratio = 1.35; 95% confidence interval [1.07, 1.70]), even after adjustment for confounding factors of suicide risk (i.e., bipolar or unipolar disorder, sex, age, marital status, education level, antidepressant intake, personal history of suicide attempt, at least one childhood trauma, and mean of the maximum depression score during the follow-up). Conversely, association between anhedonia and suicide attempt did not remain significant after adjustment. CONCLUSIONS The significant association between anhedonia and suicide ideation in patients with mood disorders stresses the need of targeting hedonia in mood disorders, and of research focusing on the position to pleasure in life through eudaimonia.
Collapse
Affiliation(s)
- Déborah Ducasse
- CHU Montpellier, Hôpital Lapeyronie, Department of Emergency Psychiatry and Post Acute Care, CHRU, Montpellier, France.,Inserm, U1061 Montpellier, University of Montpellier, Neuropsychiatry: Epidemiological and Clinical Research, Montpellier, France.,Fondation FondaMental, Créteil, France
| | - Jonathan Dubois
- Inserm, U1061 Montpellier, University of Montpellier, Neuropsychiatry: Epidemiological and Clinical Research, Montpellier, France
| | - Isabelle Jaussent
- Inserm, U1061 Montpellier, University of Montpellier, Neuropsychiatry: Epidemiological and Clinical Research, Montpellier, France
| | - Jean-Michel Azorin
- Fondation FondaMental, Créteil, France.,AP HM, Psychiatric Pole, Marseille, France
| | - Bruno Etain
- Fondation FondaMental, Créteil, France.,Université Paris-Est, Hopital Henri Mondor, DHU PePSY and AP-HP, Créteil, France
| | - Sébastien Gard
- Fondation FondaMental, Créteil, France.,Charles Perrens Hospital, Bordeaux, France
| | - Chantal Henry
- Fondation FondaMental, Créteil, France.,Université Paris-Est, Hopital Henri Mondor, DHU PePSY and AP-HP, Créteil, France
| | - Thierry Bougerol
- Fondation FondaMental, Créteil, France.,Service de Psychiatrie de l'adulte, CS 10217, Centre Expert Dépression Résistante FondaMental, CHU de Grenoble, Hôpital Nord, Grenoble, France
| | - Jean-Pierre Kahn
- Fondation FondaMental, Créteil, France.,Brabois Hospital, Academic Hospital of Nancy, Vandoeuvre Les Nancy, France
| | - Valérie Aubin
- Fondation FondaMental, Créteil, France.,Department of Psychiatry, Princesse-Grace Hospital, La Colle, Monaco
| | - Frank Bellivier
- Fondation FondaMental, Créteil, France.,Hospital Saint-Louis-Lariboisière-Fernand Widal, AP-HP, Paris, France
| | - Raoul Belzeaux
- Fondation FondaMental, Créteil, France.,AP HM, Psychiatric Pole, Marseille, France
| | - Caroline Dubertret
- Fondation FondaMental, Créteil, France.,Department of Psychiatry, Louis Mourier Hospital, AP-HP, INSERM U894, School of Medicine, Paris Diderot University, Sorbonne Paris Cité, France.,Department of Psychiatry and Clinical Psychology, Psychotherapy Center of Nancy and School of Medicine, Lorraine University, Lorraine, France
| | - Julien Dubreucq
- Fondation FondaMental, Créteil, France.,Service de Psychiatrie de l'adulte, CS 10217, Centre Expert Dépression Résistante FondaMental, CHU de Grenoble, Hôpital Nord, Grenoble, France
| | - Pierre-Michel Llorca
- Service de Psychiatrie de l'adulte B, Centre Expert Dépression Résistante FondaMental, CHU de Clermont-Ferrand, Clermont-Ferrand, France
| | - Josephine Loftus
- Fondation FondaMental, Créteil, France.,Department of Psychiatry, Princesse-Grace Hospital, La Colle, Monaco
| | - Christine Passerieux
- Fondation FondaMental, Créteil, France.,Academic Hospital of Versailles, Le Chesnay, France
| | - Mircea Polosan
- Fondation FondaMental, Créteil, France.,Service de Psychiatrie de l'adulte, CS 10217, Centre Expert Dépression Résistante FondaMental, CHU de Grenoble, Hôpital Nord, Grenoble, France
| | - Ludovic Samalin
- Service de Psychiatrie de l'adulte B, Centre Expert Dépression Résistante FondaMental, CHU de Clermont-Ferrand, Clermont-Ferrand, France
| | - Marion Leboyer
- Fondation FondaMental, Créteil, France.,Université Paris-Est, Hopital Henri Mondor, DHU PePSY and AP-HP, Créteil, France
| | - Antoine Yrondi
- Fondation FondaMental, Créteil, France.,Service de Psychiatrie et de Psychologie Médicale de l'adulte, Centre Expert Dépression Résistante FondaMental, CHRU de Toulouse, Hôpital Purpan, Toulouse, France
| | - Djamila Bennabi
- Fondation FondaMental, Créteil, France.,Service de Psychiatrie clinique, Centre Expert Dépression Résistante FondaMental, EA 481 Neurosciences, Université de Bourgogne Franche Comté, Besançon, France
| | - Emmanuel Haffen
- Fondation FondaMental, Créteil, France.,Service de Psychiatrie clinique, Centre Expert Dépression Résistante FondaMental, Centre Investigation Clinique 1431-INSERM, EA 481 Neurosciences, Université de Bourgogne Franche Comté, Besançon, France
| | - Julia Maruani
- Fondation FondaMental, Créteil, France.,Service de Psychiatrie adulte, Centre Expert Dépression Résistante FondaMental, Hôpital Fernand-Widal, Paris, France
| | - Etienne Allauze
- Fondation FondaMental, Créteil, France.,Service de Psychiatrie de l'adulte B, Centre Expert Dépression Résistante FondaMental, CHU de Clermont-Ferrand, Clermont-Ferrand, France
| | - Vincent Camus
- Clinique Psychiatrique Universitaire, Centre Expert Dépression Résistante FondaMental, Inserm U1253 Imaging and Brain, CHRU de Tours, Tours, France
| | - Thierry D'Amato
- Service Universitaire de Psychiatrie adulte, Centre Expert Dépression Résistante FondaMental, Centre Hospitalier Le Vinatier, Bron cedex, France
| | | | - Jérôme Holtzmann
- Service de Psychiatrie de l'adulte, CS 10217, Centre Expert Dépression Résistante FondaMental, CHU de Grenoble, Hôpital Nord, Grenoble, France
| | - Christophe Lançon
- Pôle Psychiatrie, Centre Expert Dépression Résistante FondaMental, CHU La Conception, Marseille, France
| | - Fanny Moliere
- CHU Montpellier, Hôpital Lapeyronie, Department of Emergency Psychiatry and Post Acute Care, CHRU, Montpellier, France
| | - Rémi Moirand
- Service Universitaire de Psychiatrie adulte, Centre Expert Dépression Résistante FondaMental, Centre Hospitalier Le Vinatier, Bron cedex, France
| | - Raphaëlle Marie Richieri
- Pôle Psychiatrie, Centre Expert Dépression Résistante FondaMental, CHU La Conception, Marseille, France
| | - Mathilde Horn
- Service de Psychiatrie adulte, Centre Expert Dépression Résistante FondaMental, CHRU de Lille, Hôpital Fontan 1, Lille, France
| | - Laurent Schmitt
- Service de Psychiatrie et de Psychologie Médicale de l'adulte, Centre Expert Dépression Résistante FondaMental, CHRU de Toulouse, Hôpital Purpan, Toulouse, France
| | - Florian Stephan
- Service de Psychiatrie de l'adulte, Centre Expert Dépression Résistante FondaMental, CHU de Brest, Hôpital de Bohars, Bohars, France
| | - Jean-Baptiste Genty
- Service de Psychiatrie de l'adulte B, Centre Expert Dépression Résistante FondaMental, CHU de Clermont-Ferrand, Clermont-Ferrand, France
| | - Guillaume Vaiva
- Service de Psychiatrie adulte, Centre Expert Dépression Résistante FondaMental, CHRU de Lille, Hôpital Fontan 1, Lille, France
| | - Michel Walter
- Service de Psychiatrie de l'adulte, Centre Expert Dépression Résistante FondaMental, CHU de Brest, Hôpital de Bohars, Bohars, France
| | - Wissam El-Hage
- Clinique Psychiatrique Universitaire, Centre Expert Dépression Résistante FondaMental, Inserm U1253 Imaging and Brain, CHRU de Tours, Tours, France
| | | | - Emilie Olié
- CHU Montpellier, Hôpital Lapeyronie, Department of Emergency Psychiatry and Post Acute Care, CHRU, Montpellier, France.,Inserm, U1061 Montpellier, University of Montpellier, Neuropsychiatry: Epidemiological and Clinical Research, Montpellier, France.,Fondation FondaMental, Créteil, France
| | - Philippe Courtet
- CHU Montpellier, Hôpital Lapeyronie, Department of Emergency Psychiatry and Post Acute Care, CHRU, Montpellier, France.,Inserm, U1061 Montpellier, University of Montpellier, Neuropsychiatry: Epidemiological and Clinical Research, Montpellier, France.,Fondation FondaMental, Créteil, France
| |
Collapse
|
5
|
Szczypiński JJ, Gola M. Dopamine dysregulation hypothesis: the common basis for motivational anhedonia in major depressive disorder and schizophrenia? Rev Neurosci 2018; 29:727-744. [PMID: 29573379 DOI: 10.1515/revneuro-2017-0091] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Accepted: 01/30/2018] [Indexed: 12/12/2022]
Abstract
Abnormalities in reward processing are crucial symptoms of major depressive disorder (MDD) and schizophrenia (SCH). Recent neuroscientific findings regarding MDD have led to conclusions about two different symptoms related to reward processing: motivational and consummatory anhedonia, corresponding, respectively, to impaired motivation to obtain rewards ('wanting'), and diminished satisfaction from consuming them ('liking'). One can ask: which of these is common for MDD and SCH. In our review of the latest neuroscientific studies, we show that MDD and SCH do not share consummatory anhedonia, as SCH patients usually have unaltered liking. Therefore, we investigated whether motivational anhedonia is the common symptom across MDD and SCH. With regard to the similarities and differences between the neural mechanisms of MDD and SCH, here we expand the current knowledge of motivation deficits and present the common underlying mechanism of motivational anhedonia - the dopamine dysregulation hypothesis - stating that any prolonged dysregulation in tonic dopamine signaling that exceeds the given equilibrium can lead to striatal dysfunction and motivational anhedonia. The implications for further research and treatment of MDD and SCH are also discussed.
Collapse
Affiliation(s)
- Jan Józef Szczypiński
- Laboratory of Brain Imaging, Neurobiology Center, Nencki Institute of Experimental Biology, Polish Academy of Sciences, 3 Pasteur Street, 02-093Warsaw, Poland.,Medical University of Warsaw, Chair of Psychiatry, Nowowiejska 27, 00-665Warsaw, Poland.,Center for Modern Interdisciplinary Technologies, Neurocognitive Laboratory, Wileńska 4, 87-100 Torun, Poland
| | - Mateusz Gola
- Swartz Center for Computational Neuroscience, Institute of Neural Computations, University of California San Diego, 9500 Gilman Drive, #0559, La Jolla, CA 92093-0559, USA.,Institute of Psychology, Polish Academy of Sciences, Clinical Neuroscience Lab, Jaracza 1, 00-001, Warsaw, Poland
| |
Collapse
|
6
|
Ballard ED, Wills K, Lally N, Richards EM, Luckenbaugh DA, Walls T, Ameli R, Niciu MJ, Brutsche NE, Park L, Zarate CA. Anhedonia as a clinical correlate of suicidal thoughts in clinical ketamine trials. J Affect Disord 2017; 218:195-200. [PMID: 28477497 PMCID: PMC5515296 DOI: 10.1016/j.jad.2017.04.057] [Citation(s) in RCA: 81] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Revised: 03/31/2017] [Accepted: 04/24/2017] [Indexed: 12/19/2022]
Abstract
BACKGROUND Identifying clinical correlates associated with reduced suicidal ideation may highlight new avenues for the treatment of suicidal thoughts. Anhedonia occurs across psychiatric diagnoses and has been associated with specific neural circuits in response to rapid-acting treatments, such as ketamine. This analysis sought to evaluate whether reductions in suicidal ideation after ketamine administration were related to reduced levels of anhedonia, independent of depressive symptoms. METHODS This post-hoc analysis included treatment-resistant patients with either major depressive disorder (MDD) or bipolar disorder (BD) from several clinical trials of ketamine. Anhedonia was assessed using a subscale of the Beck Depression Inventory (BDI) and the Snaith-Hamilton Pleasure Scale (SHAPS). The outcome of interest was suicidal ideation, as measured by a subscale of the Scale for Suicide Ideation (SSI5), one day post-ketamine administration. RESULTS Anhedonia, as measured by the SHAPS, was associated with suicidal thoughts independent of depressive symptoms both before and after ketamine administration. One day post-ketamine administration, improvements on the SHAPS accounted for an additional 13% of the variance in suicidal thought reduction, beyond the influence of depressive symptoms. The BDI anhedonia subscale was not significantly associated with suicidal thoughts after adjusting for depressive symptoms. LIMITATIONS Data were limited to patients experiencing a major depressive episode and may not be generalizable to patients experiencing an active suicidal crisis. CONCLUSIONS Suicidal thoughts may be related to symptoms of anhedonia independent of other depressive symptoms. These results have implications for the potential mechanisms of action of ketamine on suicidal thoughts.
Collapse
Affiliation(s)
- Elizabeth D Ballard
- Experimental Therapeutics & Pathophysiology Branch, Intramural Research Program, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, 20892, USA.
| | - Kathleen Wills
- Experimental Therapeutics & Pathophysiology Branch, Intramural Research Program, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Níall Lally
- Experimental Therapeutics & Pathophysiology Branch, Intramural Research Program, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, 20892, USA; Institute of Cognitive Neuroscience, University College London, London, WC1N 3AR, UK
| | - Erica M Richards
- Experimental Therapeutics & Pathophysiology Branch, Intramural Research Program, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, 20892, USA
| | - David A Luckenbaugh
- Experimental Therapeutics & Pathophysiology Branch, Intramural Research Program, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Tessa Walls
- Experimental Therapeutics & Pathophysiology Branch, Intramural Research Program, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Rezvan Ameli
- Experimental Therapeutics & Pathophysiology Branch, Intramural Research Program, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Mark J Niciu
- Experimental Therapeutics & Pathophysiology Branch, Intramural Research Program, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Nancy E Brutsche
- Experimental Therapeutics & Pathophysiology Branch, Intramural Research Program, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Lawrence Park
- Experimental Therapeutics & Pathophysiology Branch, Intramural Research Program, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Carlos A Zarate
- Experimental Therapeutics & Pathophysiology Branch, Intramural Research Program, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, 20892, USA
| |
Collapse
|
7
|
Deep Brain Stimulation for Obesity: From a Theoretical Framework to Practical Application. Neural Plast 2015; 2016:7971460. [PMID: 26819774 PMCID: PMC4706960 DOI: 10.1155/2016/7971460] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Accepted: 07/14/2015] [Indexed: 12/11/2022] Open
Abstract
Obesity remains a pervasive global health problem. While there are a number of nonsurgical and surgical options for treatment, the incidence of obesity continues to increase at an alarming rate. The inability to curtail the growing rise of the obesity epidemic may be related to a combination of increased food availability and palatability. Research into feeding behavior has yielded a number of insights into the homeostatic and reward mechanisms that govern feeding. However, there remains a gap between laboratory investigations of feeding physiology in animals and translation into meaningful treatment options for humans. In addition, laboratory investigation may not be able to recapitulate all aspects of human food consumption. In a landmark pilot study of deep brain stimulation (DBS) of the lateral hypothalamic area for obesity, we found that there was an increase in resting metabolic rate as well as a decreased urge to eat. In this review, the authors will review some of the work relating to feeding physiology and research surrounding two nodes involved in feeding homeostasis, nucleus accumbens (NAc) and hypothalamus, and use this to provide a framework for future investigations of DBS as a viable therapeutic modality for obesity.
Collapse
|
8
|
Ma H, Zhu G. The dopamine system and alcohol dependence. SHANGHAI ARCHIVES OF PSYCHIATRY 2014; 26:61-8. [PMID: 25092951 PMCID: PMC4120286 DOI: 10.3969/j.issn.1002-0829.2014.02.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/03/2013] [Accepted: 01/20/2014] [Indexed: 11/25/2022]
Abstract
Alcohol dependence is a common mental disorder that is associated with substantial disease burden. Current efforts at prevention and treatment of alcohol dependence are of very limited effectiveness. A better understanding of the biological mechanisms underlying dependence is essential to improving the outcomes of treatment and prevention initiatives. To date, most of the efforts have focused on the key role of the dopamine system in the complex etiological network of alcohol dependence. This review summarizes current research about the relationships between alcohol consumption and the dopaminergic system. We find that many of the currently available studies have contradictory results, presumably due to differences in methodology, non-linear dosage effects, use of different samples, and the possible confounding effects of other neurotransmitter systems.
Collapse
Affiliation(s)
- Hui Ma
- Center for Mental Health, Yanshan University, Qinhuangdao, Hebei Province, China ; Department of Psychiatry, the First Affiliated Hospital of China Medical University, Shenyang, Liaoning Province, China
| | - Gang Zhu
- Department of Psychiatry, the First Affiliated Hospital of China Medical University, Shenyang, Liaoning Province, China
| |
Collapse
|
9
|
Effects of dopamine receptor antagonists on the acquisition of ethanol-induced conditioned place preference in mice. Psychopharmacology (Berl) 2014; 231:459-68. [PMID: 24005528 PMCID: PMC4007149 DOI: 10.1007/s00213-013-3252-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Accepted: 08/14/2013] [Indexed: 10/26/2022]
Abstract
RATIONALE Studies support differential roles of dopamine receptor subfamilies in the rewarding and reinforcing properties of drugs of abuse, including ethanol. However, the roles these receptor subfamilies play in ethanol reward are not fully delineated. OBJECTIVE To examine the roles of dopamine receptor subfamilies in the acquisition of ethanol-induced conditioned place preference (CPP), we pretreated animals systemically with antagonist drugs selective for dopamine D1-like (SCH-23390) and D2-like (raclopride) receptors prior to ethanol conditioning trials. METHODS Effects of raclopride (0-1.2 mg/kg) and SCH-23390 (0-0.3 mg/kg) on the acquisition of ethanol-induced CPP were examined in DBA/2J mice (experiments 1 and 2). Based on significant effects of SCH-23390, we then determined if SCH-23390 (0.3 mg/kg) produced a place preference on its own (experiment 3). To evaluate whether SCH-23390 impaired learning, we used a conditioned place aversion (CPA) paradigm and pretreated animals with SCH-23390 (0-0.3 mg/kg) before conditioning sessions with LiCl (experiment 4). RESULTS Whereas raclopride (0-1.2 mg/kg) did not affect acquisition, SCH-23390 (0.1-0.3 mg/kg) impaired the development of ethanol-induced CPP. SCH-23390 (0.3 mg/kg) did not produce place preference when tested alone and SCH-23390 (0.1-0.3 mg/kg) did not perturb the acquisition of LiCl-induced CPA. CONCLUSIONS Our results support a role for dopamine D1-like but not D2-like receptors in ethanol's unconditioned rewarding effect as indexed by CPP. Blockade of D1-like receptors did not affect aversive learning in this procedure.
Collapse
|
10
|
Gaillard R, Gourion D, Llorca PM. [Anhedonia in depression]. Encephale 2013; 39:296-305. [PMID: 23937895 DOI: 10.1016/j.encep.2013.07.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2013] [Accepted: 07/09/2013] [Indexed: 02/09/2023]
Abstract
Anhedonia, or markedly diminished interest or pleasure, is a hallmark symptom of major depression, schizophrenia, and other neuropsychiatric disorders. The term "anhedonia" was introduced by the French psychologist Ribot in 1896 to describe the counterpart to analgesia in his patients, for which "it was impossible to find the least pleasure". Over the last decades, the clinical definition of anhedonia has remained relatively unchanged, but recently, behavioral neurosciences have significantly changed our knowledge of reward-related processes. Now, the construct of anhedonia reflects deficits in hedonic capacity, and is closely linked to the processes of reward valuation, decision-making, anticipation, and motivation. The neural circuits underlying these reward-related mechanisms include essentially the ventral striatum and prefrontal cortical regions. Here, we review the clinical concepts, neural bases and psychopharmacological data related to the deficits of hedonia in depression. Understanding anhedonia will facilitate diagnosis and treatment management.
Collapse
Affiliation(s)
- R Gaillard
- Inserm UMR S894, service hospitalo-universitaire, laboratoire de physiopathologie des maladies psychiatriques, centre de psychiatrie et neurosciences, université Paris Descartes, Sorbonne Paris Cité, centre hospitalier Sainte-Anne, 1, rue Cabanis, 75014 Paris, France.
| | | | | |
Collapse
|
11
|
Oxytocin, motivation and the role of dopamine. Pharmacol Biochem Behav 2013; 119:49-60. [PMID: 23850525 DOI: 10.1016/j.pbb.2013.06.011] [Citation(s) in RCA: 202] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2013] [Revised: 05/08/2013] [Accepted: 06/25/2013] [Indexed: 01/11/2023]
Abstract
The hypothalamic neuropeptide oxytocin has drawn the attention of scientists for more than a century. The understanding of the function of oxytocin has expanded dramatically over the years from a simple peptide adept at inducing uterine contractions and milk ejection to a complex neuromodulator with a capacity to shape human social behavior. Decades of research have outlined oxytocin's ability to enhance intricate social activities ranging from pair bonding, sexual activity, affiliative preferences, and parental behaviors. The precise neural mechanisms underlying oxytocin's influence on such behaviors have just begun to be understood. Research suggests that oxytocin interacts closely with the neural pathways responsible for processing motivationally relevant stimuli. In particular, oxytocin appears to impact dopaminergic activity within the mesocorticolimbic dopamine system, which is crucial not only for reward and motivated behavior but also for the expression of affiliative behaviors. Though most of the work performed in this area has been done using animal models, several neuroimaging studies suggest similar relationships may be observed in humans. In order to introduce this topic further, this paper will review the recent evidence that oxytocin may exert some of its social-behavioral effects through its impact on motivational networks.
Collapse
|
12
|
Orzeł-Gryglewska J, Kuśmierczak M, Matulewicz P, Jurkowlaniec E. Dopaminergic transmission in the midbrain ventral tegmental area in the induction of hippocampal theta rhythm. Brain Res 2013; 1510:63-77. [DOI: 10.1016/j.brainres.2013.03.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2012] [Revised: 03/04/2013] [Accepted: 03/19/2013] [Indexed: 12/11/2022]
|
13
|
Pohorecky LA, Sweeny A. Amphetamine modifies ethanol intake of psychosocially stressed male rats. Pharmacol Biochem Behav 2012; 101:417-26. [PMID: 22285324 DOI: 10.1016/j.pbb.2012.01.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2011] [Revised: 01/10/2012] [Accepted: 01/14/2012] [Indexed: 11/19/2022]
Abstract
Studies of socially housed rodents have provided significant information regarding the consequences of exposure to stressors. Psychosocial stressors are known to alter the ingestion of ethanol and the activity of the dopaminergic neuronal system. Since both stressors and ethanol are known to affect the function of dopaminergic neurons, we employed amphetamine to assess the role of this neural system on the ingestion of ethanol by psychosocially stressed male rats. Male rats housed two per cage were designated as dominant or subdominant rats based on evaluations of agonistic behavior and body weight changes. The dyad-housed rats and a group of single-housed rats were sequentially assessed for ethanol intake after injections of saline or amphetamine (0.3, 0.9 or 2.7 mg/kg i.p.) both prior to dyad housing and subsequently again during dyad-housing. Prior to dyad housing ethanol intake of future subdominant rats was higher than that of future dominant rats. Dyad-housing significantly increased ethanol intake of dominant rats. Pre-dyad the highest dose of amphetamine potently depressed ethanol ingestion. Sensitivity to amphetamine's depressant effect on ethanol intake was higher at the dyad test in all subjects, most prominently in single-housed rats. In contrast to the single-housed rats, the dyad-housed rats displayed saccharin anhedonia. It can be concluded that dopaminergic system modulates, at least partially, the psychosocial stress-induced changes in ethanol intake. Furthermore, the level of ethanol ingestion at the pre-dyad test was predictive of future hierarchical status.
Collapse
|
14
|
Tateno T, Robinson HPC. The mechanism of ethanol action on midbrain dopaminergic neuron firing: a dynamic-clamp study of the role of I(h) and GABAergic synaptic integration. J Neurophysiol 2011; 106:1901-22. [PMID: 21697445 DOI: 10.1152/jn.00162.2011] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Hyperpolarization-activated and cyclic nucleotide-gated (HCN) channels are expressed in dopaminergic (DA) neurons of the ventral tegmental area (VTA) as well as in DA and GABAergic neurons of the substantia nigra (SN). The excitation of DA neurons induced by ethanol has been proposed to result from its enhancing HCN channel current, I(h). Using perforated patch-clamp recordings in rat midbrain slices, we isolated I(h) in these neurons by voltage clamp. We showed that ethanol reversibly increased the amplitude and accelerated the activation kinetics of I(h) and caused a depolarizing shift in its voltage dependence. Using dynamic-clamp conductance injection, we injected artificial I(h) and fluctuating GABAergic synaptic conductance inputs into neurons following block of intrinsic I(h). This demonstrated directly a major role of I(h) in promoting rebound spiking following phasic inhibition, which was enhanced as the kinetics and amplitude of I(h) were changed in the manner induced by ethanol. Similar effects of ethanol were observed on I(h) and firing rate in non-DA, putatively GABAergic interneurons, indicating that in addition to its direct effects on firing, ethanol will produce large changes in the inhibition and disinhibition (via GABAergic interneurons) converging on DA neurons. Thus the overall effects of ethanol on firing of DA cells of the VTA and SN in vivo, and hence on phasic dopamine release in the striatum, appear to be determined substantially by its action on I(h) in both DA cells and GABAergic interneurons.
Collapse
Affiliation(s)
- Takashi Tateno
- Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency, Kawaguchi, Saitama, Japan
| | | |
Collapse
|
15
|
Berthoud HR, Lenard NR, Shin AC. Food reward, hyperphagia, and obesity. Am J Physiol Regul Integr Comp Physiol 2011; 300:R1266-77. [PMID: 21411768 PMCID: PMC3119156 DOI: 10.1152/ajpregu.00028.2011] [Citation(s) in RCA: 152] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2011] [Accepted: 03/11/2011] [Indexed: 01/14/2023]
Abstract
Given the unabated obesity problem, there is increasing appreciation of expressions like "my eyes are bigger than my stomach," and recent studies in rodents and humans suggest that dysregulated brain reward pathways may be contributing not only to drug addiction but also to increased intake of palatable foods and ultimately obesity. After describing recent progress in revealing the neural pathways and mechanisms underlying food reward and the attribution of incentive salience by internal state signals, we analyze the potentially circular relationship between palatable food intake, hyperphagia, and obesity. Are there preexisting individual differences in reward functions at an early age, and could they be responsible for development of obesity later in life? Does repeated exposure to palatable foods set off a cascade of sensitization as in drug and alcohol addiction? Are reward functions altered by secondary effects of the obese state, such as increased signaling through inflammatory, oxidative, and mitochondrial stress pathways? Answering these questions will significantly impact prevention and treatment of obesity and its ensuing comorbidities as well as eating disorders and drug and alcohol addiction.
Collapse
Affiliation(s)
- Hans-Rudolf Berthoud
- Neurobiology of Nutrition Laboratory, Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge, 70808, USA.
| | | | | |
Collapse
|
16
|
Treadway MT, Zald DH. Reconsidering anhedonia in depression: lessons from translational neuroscience. Neurosci Biobehav Rev 2010; 35:537-55. [PMID: 20603146 DOI: 10.1016/j.neubiorev.2010.06.006] [Citation(s) in RCA: 958] [Impact Index Per Article: 68.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2010] [Revised: 06/25/2010] [Accepted: 06/28/2010] [Indexed: 01/14/2023]
Abstract
Anhedonia is a core symptom of major depressive disorder (MDD), the neurobiological mechanisms of which remain poorly understood. Despite decades of speculation regarding the role of dopamine (DA) in anhedonic symptoms, empirical evidence has remained elusive, with frequent reports of contradictory findings. In the present review, we argue that this has resulted from an underspecified definition of anhedonia, which has failed to dissociate between consummatory and motivational aspects of reward behavior. Given substantial preclinical evidence that DA is involved primarily in motivational aspects of reward, we suggest that a refined definition of anhedonia that distinguishes between deficits in pleasure and motivation is essential for the purposes of identifying its neurobiological substrates. Moreover, bridging the gap between preclinical and clinical models of anhedonia may require moving away from the conceptualization of anhedonia as a steady-state, mood-like phenomena. Consequently, we introduce the term "decisional anhedonia" to address the influence of anhedonia on reward decision-making. These proposed modifications to the theoretical definition of anhedonia have implications for research, assessment and treatment of MDD.
Collapse
Affiliation(s)
- Michael T Treadway
- Department of Psychology, Vanderbilt University, Nashville, TN 37240, USA.
| | | |
Collapse
|
17
|
Shin AC, Zheng H, Berthoud HR. An expanded view of energy homeostasis: neural integration of metabolic, cognitive, and emotional drives to eat. Physiol Behav 2009; 97:572-80. [PMID: 19419661 PMCID: PMC2765252 DOI: 10.1016/j.physbeh.2009.02.010] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2009] [Revised: 02/03/2009] [Accepted: 02/05/2009] [Indexed: 01/01/2023]
Abstract
The traditional view of neural regulation of body energy homeostasis focuses on internal feedback signals integrated in the hypothalamus and brainstem and in turn leading to balanced activation of behavioral, autonomic, and endocrine effector pathways leading to changes in food intake and energy expenditure. Recent observations have demonstrated that many of these internal signals encoding energy status have much wider effects on the brain, particularly sensory and cortico-limbic systems that process information from the outside world by detecting and interpreting food cues, forming, storing, and recalling representations of experience with food, and assigning hedonic and motivational value to conditioned and unconditioned food stimuli. Thus, part of the metabolic feedback from the internal milieu regulates food intake and energy balance by acting on extrahypothalamic structures, leading to an expanded view of neural control of energy homeostasis taking into account the need to adapt to changing conditions in the environment. The realization that metabolic signals act directly on these non-traditional targets of body energy homeostasis brings opportunities for novel drug targets for the fight against obesity and eating disorders.
Collapse
Affiliation(s)
- Andrew C Shin
- Neurobiology of Nutrition Laboratory, Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge, Louisiana, USA
| | | | | |
Collapse
|
18
|
Hernández-González M, Martinez-Pelayo M, Arteaga Silva M, Bonilla-Jaime H, Guevara MA. Ethanol changes the electroencephalographic correlation of the ventral tegmental area and nucleus accumbens, components of the mesoaccumbens system in rats. Pharmacol Biochem Behav 2009; 92:124-30. [DOI: 10.1016/j.pbb.2008.10.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2008] [Revised: 10/29/2008] [Accepted: 10/30/2008] [Indexed: 11/28/2022]
|
19
|
Lenard NR, Berthoud HR. Central and peripheral regulation of food intake and physical activity: pathways and genes. Obesity (Silver Spring) 2008; 16 Suppl 3:S11-22. [PMID: 19190620 PMCID: PMC2687326 DOI: 10.1038/oby.2008.511] [Citation(s) in RCA: 212] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A changing environment and lifestyle on the background of evolutionary engraved and perinatally imprinted physiological response patterns is the foremost explanation for the current obesity epidemic. However, it is not clear what the mechanisms are by which the modern environment overrides the physiological controls of appetite and homeostatic body-weight regulation. Food intake and energy expenditure are controlled by complex, redundant, and distributed neural systems involving thousands of genes and reflecting the fundamental biological importance of adequate nutrient supply and energy balance. There has been much progress in identifying the important role of hypothalamus and caudal brainstem in the various hormonal and neural mechanisms by which the brain informs itself about availability of ingested and stored nutrients and, in turn, generates behavioral, autonomic, and endocrine output. Some of the genes involved in this "homeostatic" regulator are crucial for energy balance as manifested in the well-known monogenic obesity models. However, it can be clearly demonstrated that much larger portions of the nervous system of animals and humans, including the cortex, basal ganglia, and the limbic system, are concerned with the procurement of food as a basic and evolutionarily conserved survival mechanism to defend the lower limits of adiposity. By forming representations and reward expectancies through processes of learning and memory, these systems evolved to engage powerful emotions for guaranteed supply with, and ingestion of, beneficial foods from a sparse and often hostile environment. They are now simply overwhelmed with an abundance of food and food cues no longer contested by predators and interrupted by famines. The anatomy, chemistry, and functions of these elaborate neural systems and their interactions with the "homeostatic" regulator in the hypothalamus are poorly understood, and many of the genes involved are either unknown or not well characterized. This is regrettable because these systems are directly and primarily involved in the interactions of the modern environment and lifestyle with the human body. They are no less "physiological" than metabolic-regulatory mechanisms that have attracted most of the research during the past 15 years.
Collapse
Affiliation(s)
- Natalie R. Lenard
- Neurobiology of Nutrition Laboratory, Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge, Louisiana, USA
| | - Hans-Rudolf Berthoud
- Neurobiology of Nutrition Laboratory, Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge, Louisiana, USA
| |
Collapse
|
20
|
|
21
|
Abstract
Food intake and energy expenditure are controlled by complex, redundant, and distributed neural systems that reflect the fundamental biological importance of adequate nutrient supply and energy balance. Much progress has been made in identifying the various hormonal and neural mechanisms by which the brain informs itself about availability of ingested and stored nutrients and, in turn, generates behavioral, autonomic, and endocrine output. While hypothalamus and caudal brainstem play crucial roles in this homeostatic function, areas in the cortex and limbic system are important for processing information regarding prior experience with food, reward, and emotion, as well as social and environmental context. Most vertebrates can store a considerable amount of energy as fat for later use, and this ability has now become one of the major health risks for many human populations. The predisposition to develop obesity can theoretically result from any pathological malfunction or lack of adaptation to changing environments of this highly complex system.
Collapse
Affiliation(s)
- Hans-Rudolf Berthoud
- Neurobiology of Nutrition Laboratory, Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge, Louisiana, USA.
| | | |
Collapse
|
22
|
Zheng H, Berthoud HR. Neural Systems Controlling the Drive to Eat: Mind Versus Metabolism. Physiology (Bethesda) 2008; 23:75-83. [DOI: 10.1152/physiol.00047.2007] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
With the bleak outlook that 75% of Americans will be overweight or obese in 10 years, it is essential to find efficient help very soon. Knowledge of the powerful and complex neural systems conferring the basic drive to eat is a prerequisite for designing efficient therapies. Recent studies suggest that the cross talk between brain areas involved in cognitive, emotional, and metabolic-regulatory functions may explain why energy homeostasis breaks down for many predisposed individuals in our modern environment.
Collapse
Affiliation(s)
- Huiyuan Zheng
- Neurobiology of Nutrition Laboratory, Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge, Louisiana
| | - Hans-Rudi Berthoud
- Neurobiology of Nutrition Laboratory, Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge, Louisiana
| |
Collapse
|
23
|
Acute ethanol induces Fos in GABAergic and non-GABAergic forebrain neurons: a double-labeling study in the medial prefrontal cortex and extended amygdala. Neuroscience 2008; 153:259-67. [PMID: 18358631 DOI: 10.1016/j.neuroscience.2008.01.069] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2007] [Revised: 01/24/2008] [Accepted: 01/28/2008] [Indexed: 01/02/2023]
Abstract
The purpose of this study was to further address the hypothesis that ethanol activates GABAergic neurons in specific brain neurocircuits that mediate motivated behavior and control of action, such as the central extended amygdala and medial prefrontal cortex. Male Sprague-Dawley rats received habituation to 7 days of daily intragastric administration of water (5 ml/kg) followed by a single acute intragastric dose of ethanol (2.5 g/kg) or water then, 2 h later, by paraformaldehyde perfusion. Rats left undisturbed in the animal room throughout the experiment were also perfused (naive group). Brain sections were processed for single Fos immunohistochemistry or dual Fos immunohistochemistry/glutamic acid decarboxylase (GAD) mRNA in situ hybridization. Intragastric water administration increased the number of Fos-immunoreactive cells in the infralimbic cortex and lateral part of the central nucleus of the amygdala compared with the naive group. Ethanol administration increased the number of Fos-immunoreactive cells in the infralimbic (+57.5%) and prelimbic (+105.3%) cortices, nucleus accumbens shell region (+88.2%), medial part of the central nucleus of the amygdala (+160%), and lateral part of the bed nucleus of the stria terminalis (+198.8%) compared with the water-treated group. In the nucleus accumbens shell region, central nucleus of the amygdala, and bed nucleus of the stria terminalis, more than 80% of Fos-immunoreactive neurons were GABAergic after ethanol administration. In contrast, in the prelimbic cortex, 75% of Fos-immunoreactive neurons were not GABAergic. These results constitute new evidence for region-specific functional interactions between ethanol and GABAergic neurons.
Collapse
|
24
|
Liao RM. Development of conditioned place preference induced by intra-accumbens infusion of amphetamine is attenuated by co-infusion of dopamine D1 and D2 receptor antagonists. Pharmacol Biochem Behav 2008; 89:367-73. [PMID: 18275994 DOI: 10.1016/j.pbb.2008.01.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2007] [Revised: 01/07/2008] [Accepted: 01/14/2008] [Indexed: 10/22/2022]
Abstract
The present study investigated the role of dopamine receptors within the nucleus accumbens in place conditioning induced by D-amphetamine. Previous work has shown that conditioned place preference can be established by intra-accumbens infusion of amphetamine. The present study further examined whether bilateral co-infusion of the selective dopamine receptor antagonists with D-amphetamine into this region would disrupt the development of conditioned place preference induced by intra-accumbens amphetamine treatment. Bilateral infusions of D-amphetamine into the nucleus accumbens at the dose of 10 microg per side significantly induced conditioned place preference. At the tested doses of 1 microg and 10 microg, either the selective D1 dopamine receptor antagonist (SCH23390) or the selective D2 dopamine receptor antagonist (raclopride) infused with the high dose into the nucleus accumbens significantly blocked the development of conditioned place preference induced by intra-accumbens amphetamine treatment. Furthermore, the sole infusion of SCH23390 or raclopride into the nucleus accumbens produced little or no place conditioning effect. It is concluded that the dopamine D1 and D2 receptors in the nucleus accumbens are critically involved in the development of amphetamine induced conditioned place preference.
Collapse
Affiliation(s)
- Ruey-Ming Liao
- Department of Psychology, Research Center for Mind, Brain and Learning, Graduate Institute of Life Science, National Cheng-Chi University, Taipei, Taiwan.
| |
Collapse
|
25
|
Berridge KC. The debate over dopamine's role in reward: the case for incentive salience. Psychopharmacology (Berl) 2007; 191:391-431. [PMID: 17072591 DOI: 10.1007/s00213-006-0578-x] [Citation(s) in RCA: 1446] [Impact Index Per Article: 85.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2006] [Accepted: 08/20/2006] [Indexed: 01/25/2023]
Abstract
INTRODUCTION Debate continues over the precise causal contribution made by mesolimbic dopamine systems to reward. There are three competing explanatory categories: 'liking', learning, and 'wanting'. Does dopamine mostly mediate the hedonic impact of reward ('liking')? Does it instead mediate learned predictions of future reward, prediction error teaching signals and stamp in associative links (learning)? Or does dopamine motivate the pursuit of rewards by attributing incentive salience to reward-related stimuli ('wanting')? Each hypothesis is evaluated here, and it is suggested that the incentive salience or 'wanting' hypothesis of dopamine function may be consistent with more evidence than either learning or 'liking'. In brief, recent evidence indicates that dopamine is neither necessary nor sufficient to mediate changes in hedonic 'liking' for sensory pleasures. Other recent evidence indicates that dopamine is not needed for new learning, and not sufficient to directly mediate learning by causing teaching or prediction signals. By contrast, growing evidence indicates that dopamine does contribute causally to incentive salience. Dopamine appears necessary for normal 'wanting', and dopamine activation can be sufficient to enhance cue-triggered incentive salience. Drugs of abuse that promote dopamine signals short circuit and sensitize dynamic mesolimbic mechanisms that evolved to attribute incentive salience to rewards. Such drugs interact with incentive salience integrations of Pavlovian associative information with physiological state signals. That interaction sets the stage to cause compulsive 'wanting' in addiction, but also provides opportunities for experiments to disentangle 'wanting', 'liking', and learning hypotheses. Results from studies that exploited those opportunities are described here. CONCLUSION In short, dopamine's contribution appears to be chiefly to cause 'wanting' for hedonic rewards, more than 'liking' or learning for those rewards.
Collapse
Affiliation(s)
- Kent C Berridge
- Department of Psychology, University of Michigan, 530 Church Street (East Hall), Ann Arbor, MI 48109, USA.
| |
Collapse
|
26
|
Berthoud HR. Interactions between the "cognitive" and "metabolic" brain in the control of food intake. Physiol Behav 2007; 91:486-98. [PMID: 17307205 DOI: 10.1016/j.physbeh.2006.12.016] [Citation(s) in RCA: 164] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2006] [Revised: 12/28/2006] [Accepted: 12/28/2006] [Indexed: 01/22/2023]
Abstract
If the new environment and modern lifestyle cause obesity in individuals with thrifty genes by increasing energy intake, it is important to know by what mechanisms hyperphagia occurs and why energy balance is not kept in check by the homeostatic regulator. The argument is developed that procuring and ingesting food is an evolutionarily conserved survival mechanism that occupies large parts of the brain's computing capacity including not only the hypothalamus but also a number of cortico-limbic structures. These forebrain systems evolved to engage powerful emotions for guaranteed supply and ingestion of beneficial foods from a sparse and often hostile environment. They are now simply overwhelmed with an abundance of food and food cues that is no longer interrupted by frequent famines. After briefly reviewing structure and functions of the relevant cortico-limbic structures and the better-known hypothalamic homeostatic regulator, the review focuses mainly on interactions between the two systems. Although several cortico-limbic processes are sensitive to metabolic depletion and repletion signals, it appears that they are underlying the same reversible leptin resistance that renders hypothalamic circuits insensible to continuously high leptin levels during periods of feast. It is hypothesized that this naturally occurring leptin resistance allowed temporary neutralization of satiety mechanisms and evolved as a response to survive subsequent periods of famine. With today's continuous and abundant food availability for a segment of the population, the powerful cognitive processes to eat and the resulting overweight can partially escape negative feedback control in prone individuals most strongly expressing such thrifty genes.
Collapse
Affiliation(s)
- Hans-Rudolf Berthoud
- Neurobiology of Nutrition Laboratory, Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge, LA 70808, USA.
| |
Collapse
|
27
|
Okamoto T, Harnett MT, Morikawa H. Hyperpolarization-activated cation current (Ih) is an ethanol target in midbrain dopamine neurons of mice. J Neurophysiol 2005; 95:619-26. [PMID: 16148268 PMCID: PMC1454360 DOI: 10.1152/jn.00682.2005] [Citation(s) in RCA: 150] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Ethanol stimulates the firing activity of midbrain dopamine (DA) neurons, leading to enhanced dopaminergic transmission in the mesolimbic system. This effect is thought to underlie the behavioral reinforcement of alcohol intake. Ethanol has been shown to directly enhance the intrinsic pacemaker activity of DA neurons, yet the cellular mechanism mediating this excitation remains poorly understood. The hyperpolarization-activated cation current, Ih, is known to contribute to the pacemaker firing of DA neurons. To determine the role of Ih in ethanol excitation of DA neurons, we performed patch-clamp recordings in acutely prepared mouse midbrain slices. Superfusion of ethanol increased the spontaneous firing frequency of DA neurons in a reversible fashion. Treatment with ZD7288, a blocker of Ih, irreversibly depressed basal firing frequency and significantly attenuated the stimulatory effect of ethanol on firing. Furthermore, ethanol reversibly augmented Ih amplitude and accelerated its activation kinetics. This effect of ethanol was accompanied by a shift in the voltage dependence of Ih activation to more depolarized potentials and an increase in the maximum Ih conductance. Cyclic AMP mediated the depolarizing shift in Ih activation but not the increase in the maximum conductance. Finally, repeated ethanol treatment in vivo induced downregulation of Ih density in DA neurons and an accompanying reduction in the magnitude of ethanol stimulation of firing. These results suggest an important role of Ih in the reinforcing actions of ethanol and in the neuroadaptations underlying escalation of alcohol consumption associated with alcoholism.
Collapse
Affiliation(s)
- Takashi Okamoto
- Waggoner Center for Alcohol and Addiction Research, Section of Neurobiology and Institute for Neuroscience, University of Texas, Austin, TX 78712, USA
| | | | | |
Collapse
|
28
|
Abstract
Concepts of motivation are vital to progress in behavioral neuroscience. Motivational concepts help us to understand what limbic brain systems are chiefly evolved to do, i.e., to mediate psychological processes that guide real behavior. This article evaluates some major motivation concepts that have historic importance or have influenced the interpretation of behavioral neuroscience research. These concepts include homeostasis, setpoints and settling points, intervening variables, hydraulic drives, drive reduction, appetitive and consummatory behavior, opponent processes, hedonic reactions, incentive motivation, drive centers, dedicated drive neurons (and drive neuropeptides and receptors), neural hierarchies, and new concepts from affective neuroscience such as allostasis, cognitive incentives, and reward 'liking' versus 'wanting'.
Collapse
Affiliation(s)
- Kent C Berridge
- Department of Psychology, University of Michigan, 525 E University Street, Ann Arbor, MI 48109-1109, USA.
| |
Collapse
|
29
|
Abstract
Advances in neurobiology permit neuroscientists to manipulate specific brain molecules, neurons and systems. This has lead to major advances in the neuroscience of reward. Here, it is argued that further advances will require equal sophistication in parsing reward into its specific psychological components: (1) learning (including explicit and implicit knowledge produced by associative conditioning and cognitive processes); (2) affect or emotion (implicit 'liking' and conscious pleasure) and (3) motivation (implicit incentive salience 'wanting' and cognitive incentive goals). The challenge is to identify how different brain circuits mediate different psychological components of reward, and how these components interact.
Collapse
Affiliation(s)
- Kent C Berridge
- Department of Psychology, Biopsychology Program, University of Michigan, Ann Arbor, MI 48109-1109, USA.
| | | |
Collapse
|
30
|
Chandler LJ. Ethanol and brain plasticity: receptors and molecular networks of the postsynaptic density as targets of ethanol. Pharmacol Ther 2003; 99:311-26. [PMID: 12951163 DOI: 10.1016/s0163-7258(03)00096-2] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Brain plasticity refers to the ability of the brain to undergo structural and functional changes. It is a necessary process that allows us to adapt and learn from our environment and is fundamental to our survival. However, under certain conditions, these neuroadaptive responses can have adverse consequences. In particular, increasing evidence indicates that plastic processes are coopted by drugs of abuse, leading to addiction and associated drug-seeking behaviors. An extensive and diverse group of studies ranging from the molecular to the behavioral level has also strongly implicated glutamatergic neurotransmission as a critical mediator of experience-dependent synaptic plasticity. Thus, it is vital to understand how drugs of abuse interact and potentially alter glutamatergic neurotransmission and associated signal transduction processes. This review will focus on the cellular and molecular neuroscience of alcoholism, with emphasis on events at the glutamatergic postsynaptic density (PSD) and dendritic spine dynamics that appear to underlie much of the structural and functional plasticity of the CNS.
Collapse
Affiliation(s)
- L Judson Chandler
- Department of Physiology, Medical University of South Carolina, 67 President Street, Charleston, SC 29425-2508, USA.
| |
Collapse
|
31
|
Bassareo V, De Luca MA, Aresu M, Aste A, Ariu T, Di Chiara G. Differential adaptive properties of accumbens shell dopamine responses to ethanol as a drug and as a motivational stimulus. Eur J Neurosci 2003; 17:1465-72. [PMID: 12713649 DOI: 10.1046/j.1460-9568.2003.02556.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Non-adaptive activation of dopamine transmission in the nucleus accumbens shell by drugs of abuse has been attributed a fundamental role in the mechanism of drug addiction. In order to test this hypothesis, we compared in the same subject the effect of an addictive drug (ethanol) and of taste stimuli, including ethanol's own taste, on dialysate dopamine in the nucleus accumbens shell as an estimate of dopamine transmission and on taste reactivity as an expression of motivational valence. Ethanol was also monitored in the dialysates. In naive rats, intraoral infusion of a 20% sucrose + chocolate solution elicited a monophasic increase of dialysate dopamine immediately after the intraoral infusion. In contrast, intraoral infusion of 10% ethanol, 10% ethanol + 20% sucrose or 10% ethanol + 20% sucrose + chocolate solutions elicited a biphasic increase of nucleus accumbens dopamine with an early taste-related rise and a late rise related to dialysate ethanol. Pre-exposure to the ethanol solutions 24 h before resulted in the absence of the early dopamine rise and permanence of the late dopamine rise. This late dopamine rise was actually increased as compared with that of the nonpre-exposed group when sucrose-containing ethanol solutions were tested. The results indicate that single trial pre-exposure to the ethanol solutions differentially affects the responsiveness of nucleus accumbens shell dopamine to the direct intracerebral action of ethanol and to the effect of its taste with potentiation, or no change of the first and abolition of the second. These observations point to the existence of major differences in the adaptive regulation of nucleus accumbens dopamine transmission in the shell after drug as compared with taste reward. These differences, in turn, are consistent with a role of nucleus accumbens shell dopamine in the mechanism of the behavioural effects of addictive drugs.
Collapse
Affiliation(s)
- Valentina Bassareo
- Department of Toxicology and Consiglio Nazionale delle Ricerche, Center for Neuropharmacology, University of Cagliari, Via Ospedale 72, 09124 Cagliari, Italy
| | | | | | | | | | | |
Collapse
|
32
|
Long-lasting potentiation of GABAergic synapses in dopamine neurons after a single in vivo ethanol exposure. J Neurosci 2002. [PMID: 11896147 DOI: 10.1523/jneurosci.22-06-02074.2002] [Citation(s) in RCA: 130] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The mesolimbic dopamine (DA) system originating in the ventral tegmental area (VTA) is involved in many drug-related behaviors, including ethanol self-administration. In particular, VTA activity regulating ethanol consummatory behavior appears to be modulated through GABA(A) receptors. Previous exposure to ethanol enhances ethanol self-administration, but the mechanisms underlying this phenomenon are not well understood. In this study, we examined changes occurring at GABA synapses onto VTA DA neurons after a single in vivo exposure to ethanol. We observed that evoked GABA(A) IPSCs in DA neurons of ethanol-treated animals exhibited paired-pulse depression (PPD) compared with saline-treated animals, which exhibited paired-pulse facilitation (PPF). Furthermore, PPD was still present 1 week after the single exposure to ethanol. An increase in frequency of spontaneous miniature GABA(A) IPSCs (mIPSCs) was also observed in the ethanol-treated animals. Additionally, the GABA(B) receptor antagonist (3-aminopropyl)(diethoxymethyl) phosphinic acid shifted PPD to PPF, indicating that presynaptic GABA(B) receptor activation, likely attributable to GABA spillover, might play a role in mediating PPD in the ethanol-treated mice. The activation of adenylyl cyclase by forskolin increased the amplitude of GABA(A) IPSCs and the frequency of mIPSCs in the saline- but not in the ethanol-treated animals. Conversely, the protein kinase A (PKA) inhibitor N-[z-(p-bromocinnamylamino)ethyl]-5-isoquinolinesulfonamide significantly decreased both the frequency of spontaneous mIPSCs and the amplitude of GABA(A) IPSCs in the ethanol-treated mice but not in the saline controls. The present results indicate that potentiation of GABAergic synapses, via a PKA-dependent mechanism, occurs in the VTA after a single in vivo exposure to ethanol, and such potentiation might be a key synaptic modification underlying increased ethanol intake.
Collapse
|