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Ricard JA, Labache L, Segal A, Dhamala E, Cocuzza CV, Jones G, Yip SW, Chopra S, Holmes AJ. A shared spatial topography links the functional connectome correlates of cocaine use disorder and dopamine D 2/3 receptor densities. Commun Biol 2024; 7:1178. [PMID: 39300138 PMCID: PMC11413242 DOI: 10.1038/s42003-024-06836-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Accepted: 09/03/2024] [Indexed: 09/22/2024] Open
Abstract
The biological mechanisms that contribute to cocaine and other substance use disorders involve an array of cortical and subcortical systems. Prior work on the development and maintenance of substance use has largely focused on cortico-striatal circuits, with relatively less attention on alterations within and across large-scale functional brain networks, and associated aspects of the dopamine system. Here, we characterize patterns of functional connectivity in cocaine use disorder and their spatial association with neurotransmitter receptor densities and transporter bindings assessed through PET. Profiles of functional connectivity in cocaine use disorder reliably linked with spatial densities of dopamine D2/3 receptors across independent datasets. These findings demonstrate that the topography of dopamine receptor densities may underlie patterns of functional connectivity in cocaine use disorder, as assessed through fMRI.
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Affiliation(s)
- Jocelyn A Ricard
- Stanford Neurosciences Interdepartmental Program, Stanford University School of Medicine, Stanford, CA, USA.
| | - Loïc Labache
- Department of Psychiatry, Brain Health Institute, Rutgers University, NJ, USA
| | - Ashlea Segal
- Department of Neuroscience, Yale University, New Haven, CT, USA
- Wu Tsai Institute, Yale University, New Haven, CT, USA
| | - Elvisha Dhamala
- Feinstein Institutes for Medical Research, Northwell Health, Manhasset, New York, USA
| | - Carrisa V Cocuzza
- Department of Psychiatry, Brain Health Institute, Rutgers University, NJ, USA
| | - Grant Jones
- Department of Psychology, Harvard University, Cambridge, MA, USA
| | - Sarah W Yip
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA
| | - Sidhant Chopra
- Department of Psychiatry, Brain Health Institute, Rutgers University, NJ, USA.
- Orygen, Melbourne, VIC, Australia.
- Centre for Youth Mental Health, The University of Melbourne, Melbourne, VIC, Australia.
| | - Avram J Holmes
- Department of Psychiatry, Brain Health Institute, Rutgers University, NJ, USA.
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Kim JS, Williams KC, Kirkland RA, Schade R, Freeman KG, Cawthon CR, Rautmann AW, Smith JM, Edwards GL, Glenn TC, Holmes PV, de Lartigue G, de La Serre CB. The gut-brain axis mediates bacterial driven modulation of reward signaling. Mol Metab 2023; 75:101764. [PMID: 37380023 PMCID: PMC10372379 DOI: 10.1016/j.molmet.2023.101764] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 06/18/2023] [Accepted: 06/23/2023] [Indexed: 06/30/2023] Open
Abstract
OBJECTIVE Our goal is to investigate if microbiota composition modulates reward signaling and assess the role of the vagus in mediating microbiota to brain communication. METHODS Male germ-free Fisher rats were colonized with gastrointestinal contents from chow (low fat (LF) ConvLF) or HF (ConvHF) fed rats. RESULTS Following colonization, ConvHF rats consumed significantly more food than ConvLF animals. ConvHF rats displayed lower feeding-induced extracellular DOPAC levels (a metabolite of dopamine) in the Nucleus Accumbens (NAc) as well as reduced motivation for HF foods compared to ConvLF rats. Dopamine receptor 2 (DDR2) expression levels in the NAc were also significantly lower in ConvHF animals. Similar deficits were observed in conventionally raised HF fed rats, showing that diet-driven alteration in reward can be initiated via microbiota. Selective gut to brain deafferentation restored DOPAC levels, DRD2 expression, and motivational drive in ConvHF rats. CONCLUSIONS We concluded from these data that a HF-type microbiota is sufficient to alter appetitive feeding behavior and that bacteria to reward communication is mediated by the vagus nerve.
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Affiliation(s)
- Jiyoung S Kim
- Department of Nutritional Sciences, University of Georgia, USA
| | | | | | - Ruth Schade
- Department of Nutritional Sciences, University of Georgia, USA
| | | | | | | | | | - Gaylen L Edwards
- Department of Physiology and Pharmacology, University of Georgia, USA
| | - Travis C Glenn
- Department of Environmental Health Science, University of Georgia, USA
| | | | - Guillaume de Lartigue
- Monell Chemical Senses Center and Department of Neuroscience, Perelman School of Medicine, University of Pennsylvania, USA
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Hazani HM, Naina Mohamed I, Muzaimi M, Mohamed W, Yahaya MF, Teoh SL, Pakri Mohamed RM, Mohamad Isa MF, Abdulrahman SM, Ramadah R, Kamaluddin MR, Kumar J. Goofballing of Opioid and Methamphetamine: The Science Behind the Deadly Cocktail. Front Pharmacol 2022; 13:859563. [PMID: 35462918 PMCID: PMC9021401 DOI: 10.3389/fphar.2022.859563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 03/18/2022] [Indexed: 11/23/2022] Open
Abstract
Globally, millions of people suffer from various substance use disorders (SUD), including mono-and polydrug use of opioids and methamphetamine. Brain regions such as the cingulate cortex, infralimbic cortex, dorsal striatum, nucleus accumbens, basolateral and central amygdala have been shown to play important roles in addiction-related behavioral changes. Clinical and pre-clinical studies have characterized these brain regions and their corresponding neurochemical changes in numerous phases of drug dependence such as acute drug use, intoxication, craving, withdrawal, and relapse. At present, many studies have reported the individual effects of opioids and methamphetamine. However, little is known about their combined effects. Co-use of these drugs produces effects greater than either drug alone, where one decreases the side effects of the other, and the combination produces a prolonged intoxication period or a more desirable intoxication effect. An increasing number of studies have associated polydrug abuse with poorer treatment outcomes, drug-related deaths, and more severe psychopathologies. To date, the pharmacological treatment efficacy for polydrug abuse is vague, and still at the experimental stage. This present review discusses the human and animal behavioral, neuroanatomical, and neurochemical changes underlying both morphine and methamphetamine dependence separately, as well as its combination. This narrative review also delineates the recent advances in the pharmacotherapy of mono- and poly drug-use of opioids and methamphetamine at clinical and preclinical stages.
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Affiliation(s)
- Hanis Mohammad Hazani
- Department of Physiology, Faculty of Medicine, The National University of Malaysia, Cheras, Malaysia
| | - Isa Naina Mohamed
- Department of Pharmacology, Faculty of Medicine, The National University of Malaysia, Cheras, Malaysia
| | - Mustapha Muzaimi
- Department of Neurosciences, School of Medical Sciences, Universiti Sains Malaysia, Kota Bharu, Malaysia
| | - Wael Mohamed
- Basic Medical Science Department, Kulliyyah of Medicine, International Islamic University Malaysia, Kuantan, Malaysia
- Faculty of Medicine, Department of Clinical Pharmacology, Menoufia University, Shebin El-Kom, Egypt
| | - Mohamad Fairuz Yahaya
- Department of Anatomy, Faculty of Medicine, National University of Malaysia, Cheras, Malaysia
| | - Seong Lin Teoh
- Department of Anatomy, Faculty of Medicine, National University of Malaysia, Cheras, Malaysia
| | | | | | | | - Ravi Ramadah
- National Anti-Drugs Agency Malaysia, Selangor, Malaysia
| | - Mohammad Rahim Kamaluddin
- Centre for Research in Psychology and Human Well-Being, Faculty of Social Sciences and Humanities, The National University of Malaysia, Bangi, Malaysia
| | - Jaya Kumar
- Department of Physiology, Faculty of Medicine, The National University of Malaysia, Cheras, Malaysia
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Chou T, D’Orsogna MR. A mathematical model of reward-mediated learning in drug addiction. CHAOS (WOODBURY, N.Y.) 2022; 32:021102. [PMID: 35232044 PMCID: PMC8816520 DOI: 10.1063/5.0082997] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Substances of abuse are known to activate and disrupt neuronal circuits in the brain reward system. We propose a simple and easily interpretable dynamical systems model to describe the neurobiology of drug addiction that incorporates the psychiatric concepts of reward prediction error, drug-induced incentive salience, and opponent process theory. Drug-induced dopamine releases activate a biphasic reward response with pleasurable, positive "a-processes" (euphoria, rush) followed by unpleasant, negative "b-processes" (cravings, withdrawal). Neuroadaptive processes triggered by successive intakes enhance the negative component of the reward response, which the user compensates for by increasing drug dose and/or intake frequency. This positive feedback between physiological changes and drug self-administration leads to habituation, tolerance, and, eventually, to full addiction. Our model gives rise to qualitatively different pathways to addiction that can represent a diverse set of user profiles (genetics, age) and drug potencies. We find that users who have, or neuroadaptively develop, a strong b-process response to drug consumption are most at risk for addiction. Finally, we include possible mechanisms to mitigate withdrawal symptoms, such as through the use of methadone or other auxiliary drugs used in detoxification.
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Affiliation(s)
- Tom Chou
- Department of Computational Medicine, UCLA, Los Angeles, California 90095-1766, USA
| | - Maria R. D’Orsogna
- Department of Mathematics, California State University at Northridge, Los Angeles, California 91130-8313, USA
- Also at: Department of Computational Medicine, UCLA, Los Angeles, CA 90095-1766, USA. Author to whom correspondence should be addressed:
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Gómez-Coronado N, Sethi R, Bortolasci CC, Arancini L, Berk M, Dodd S. A review of the neurobiological underpinning of comorbid substance use and mood disorders. J Affect Disord 2018; 241:388-401. [PMID: 30145509 DOI: 10.1016/j.jad.2018.08.041] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Revised: 07/09/2018] [Accepted: 08/10/2018] [Indexed: 12/19/2022]
Abstract
BACKGROUND There is evidence that substance use disorders and other mental disorders may have shared biological mechanisms. However, the neurobiological basis of this comorbidity remains only partially explained. This review describes the historical evolution of the dual disorders concept and approach, and reviews the existing literature on neurobiological findings specifically regarding comorbid substance use and mood disorders. METHODS Searches were conducted using PubMed and Scopus in December 2017. A Boolean search was performed using combinations of "dual diagnosis" or "dual disorder" or "depression" or "bipolar" or "affective disorder" or "mood disorder" and "substance use" or "substance abuse" and "neurobiology" or "functional neuroimaging" or "genetics" or "neurotransmitters" or "neuroendocrinology" in the title or abstract, or as keywords, using no language restriction. RESULTS 32 studies met the inclusion criteria. We found robust evidence for involvement of the neurotransmitters dopamine, GABA and glutamate and their receptors, as well as by the central corticotrophin-releasing hormone, hypothalamic-pituitary-adrenal axis activation, oxidative stress and inflammation. Recent studies focusing on neuroimaging and genetics have not shown consistent results. LIMITATIONS Only two search tools were used; most identified studies excluded the population of interest (comorbid mood and substance abuse disorders). CONCLUSIONS The neurobiological relevance for the occurrence of comorbid mood and substance abuse disorders has not been fully elucidated. Considering the high levels of individuals who experience comorbidity in these areas as well as the negative associated outcomes, this is clearly an area that requires further in-depth investigation. Furthermore, findings from this area can help to inform drug abuse prevention and intervention efforts, and especially how they relate to populations with psychiatric symptoms.
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Affiliation(s)
- Nieves Gómez-Coronado
- Unidad de Gestión Clínica Salud Mental, Hospital Universitario Virgen del Rocío, Sevilla, Spain; Department of Psychiatry, Hospital San Agustín ORL, Dos Hermanas, Sevilla, Spain
| | - Rickinder Sethi
- London Health Sciences Centre, Western University, London, Canada
| | - Chiara Cristina Bortolasci
- Centre for Molecular and Medical Research, School of Medicine, Deakin University, Geelong, VIC, Australia
| | - Lauren Arancini
- IMPACT Strategic Research Centre, Deakin University, Geelong, VIC, Australia
| | - Michael Berk
- IMPACT Strategic Research Centre, Deakin University, Geelong, VIC, Australia; University Hospital Geelong, Barwon Health, Geelong VIC, Australia; Department of Psychiatry, The University of Melbourne, Parkville, VIC, Australia; Orygen, The National Centre for Excellence in Youth Mental Health, Parkville, VIC, Australia; Florey Institute of Neuroscience and Mental Health, Parkville, VIC, Australia
| | - Seetal Dodd
- IMPACT Strategic Research Centre, Deakin University, Geelong, VIC, Australia; University Hospital Geelong, Barwon Health, Geelong VIC, Australia; Department of Psychiatry, The University of Melbourne, Parkville, VIC, Australia; Orygen, The National Centre for Excellence in Youth Mental Health, Parkville, VIC, Australia.
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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.
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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
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Abstract
INTRODUCTION Tourette syndrome (TS) is a neurodevelopmental disorder with a high prevalence of psychiatric comorbidity. The most common comorbid disorder in patients with TS is attention-deficit/hyperactivity disorder (ADHD). To date, there have been few reports concerning the association of TS with addiction. METHODS We report on 4 patients with TS, ADHD, and heroin addiction. RESULTS All 4 patients were male and initially presented with TS when they were between 5 and 12 years of age, although 2 of the patients were not diagnosed with TS until they were adults. The patients currently range in age from 21 to 52 years, all having experienced the onset of heroin addiction in adolescence. A reduction in tics during periods of heroin abuse was noted in all patients. DISCUSSION The lifetime prevalence of psychiatric comorbidity in patients with TS is 85.7%, with 57.7% of patients having ≥2 psychiatric conditions in addition to TS. All of the 4 patients in our case series demonstrated a pattern of severe tics, ADHD, impulsive behavior, and heroin addiction. Our observation that these 4 patients with TS showed reduced tics during periods of heroin dependence could be related to the previously described effects of opiates on dopaminergic transmission. CONCLUSIONS The observed reduction of tics during heroin dependence warrants further clinical research.
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Opiate exposure state controls dopamine D3 receptor and cdk5/calcineurin signaling in the basolateral amygdala during reward and withdrawal aversion memory formation. Prog Neuropsychopharmacol Biol Psychiatry 2017. [PMID: 28627448 DOI: 10.1016/j.pnpbp.2017.06.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The dopamine (DA) D3 receptor (D3R) is highly expressed in the basolateral nucleus of the amygdala (BLA), a neural region critical for processing opiate-related reward and withdrawal aversion-related memories. Functionally, D3R transmission is linked to downstream Cdk5 and calcineurin signaling, both of which regulate D3R activity states and play critical roles in memory-related synaptic plasticity. Previous evidence links D3R transmission to opiate-related memory processing, however little is known regarding how chronic opiate exposure may alter D3R-dependent memory mechanisms. Using conditioned place preference (CPP) and withdrawal aversion (conditioned place aversion; CPA) procedures in rats, combined with molecular analyses of BLA protein expression, we examined the effects of chronic opiate exposure on the functional role of intra-BLA D3R transmission during the acquisition of opiate reward or withdrawal aversion memories. Remarkably, we report that the state of opiate exposure during behavioural conditioning (opiate-naïve/non-dependent vs. chronically exposed and in withdrawal) controlled the functional role of intra-BLA D3R transmission during the acquisition of both opiate reward memories and withdrawal-aversion associative memories. Thus, whereas intra-BLA D3R blockade had no effect on opiate reward memory formation in the non-dependent state, blockade of intra-BLA D3R transmission prevented the formation of opiate reward and withdrawal aversion memory in the chronically exposed state. This switch in the functional role of D3R transmission corresponded to significant increases in Cdk5 phosphorylation and total expression levels of calcineurin, and a corresponding decrease in intra-BLA D3R expression. Inhibition of either intra-BLA Cdk5 or calcineurin reversed these effects, switching intra-BLA associative memory formation back to a D3R-independent mechanism.
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Strickland JC, Bolin BL, Romanelli MR, Rush CR, Stoops WW. Effects of acute buspirone administration on inhibitory control and sexual discounting in cocaine users. Hum Psychopharmacol 2017; 32. [PMID: 28120485 DOI: 10.1002/hup.2567] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Revised: 10/12/2016] [Accepted: 11/25/2016] [Indexed: 02/06/2023]
Abstract
OBJECTIVE Cocaine users display deficits in inhibitory control and make impulsive choices that may increase risky behavior. Buspirone is an anxiolytic that activates dopaminergic and serotonergic systems and improves impulsive choice (i.e., reduces sexual risk-taking intent) in cocaine users when administered chronically. We evaluated the effects of acutely administered buspirone on inhibitory control and impulsive choice. METHODS Eleven subjects with a recent history of cocaine use completed this within-subject, placebo-controlled study. Subjects performed two cued go/no-go and a sexual risk delay-discounting task following oral administration of buspirone (10 and 30 mg), triazolam (0.375 mg; positive control), and placebo (negative control). Physiological and psychomotor performance and subject-rated data were also collected. RESULTS Buspirone failed to change inhibitory control or impulsive choice; however, slower reaction times were observed at the highest dose tested. Buspirone did not produce subject-rated drug effects but dose-dependently decreased diastolic blood pressure. Triazolam impaired psychomotor performance and increased ratings of positive subject-rated effects (e.g., Like Drug). CONCLUSIONS These findings indicate that acutely administered buspirone has little impact on behavioral measures of inhibitory control and impulsive sexual decision-making. Considering previous findings with chronic dosing, these findings highlight that the behavioral effects of buspirone differ as a function of dosing conditions.
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Affiliation(s)
| | - B Levi Bolin
- Department of Behavioral Science, College of Medicine, University of Kentucky, Lexington, Kentucky, USA
| | | | - Craig R Rush
- Department of Psychology, University of Kentucky, Lexington, Kentucky, USA.,Department of Behavioral Science, College of Medicine, University of Kentucky, Lexington, Kentucky, USA.,Department of Psychiatry, College of Medicine, University of Kentucky, Lexington, Kentucky, USA
| | - William W Stoops
- Department of Psychology, University of Kentucky, Lexington, Kentucky, USA.,Department of Behavioral Science, College of Medicine, University of Kentucky, Lexington, Kentucky, USA.,Department of Psychiatry, College of Medicine, University of Kentucky, Lexington, Kentucky, USA
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Zhu Y, Wang Y, Lai J, Wei S, Zhang H, Yan P, Li Y, Qiao X, Yin F. Dopamine D1 and D3 Receptors Modulate Heroin-Induced Cognitive Impairment through Opponent Actions in Mice. Int J Neuropsychopharmacol 2016; 20:257-268. [PMID: 27815417 PMCID: PMC5408975 DOI: 10.1093/ijnp/pyw099] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Accepted: 11/02/2016] [Indexed: 01/24/2023] Open
Abstract
BACKGROUND Chronic abuse of heroin leads to long-lasting and complicated cognitive impairment. Dopamine receptors are critically involved in the impulsive drug-driven behavior and the altered attention, processing speed, and mental flexibility that are associated with higher relapse rates. However, the effects of the different dopamine receptors and their possible involvement in heroin-induced cognitive impairment remain unclear. METHODS The 5-choice serial reaction time task was used to investigate the profiles of heroin-induced cognitive impairment in mice. The expression levels of dopamine D1- and D2-like receptors in the prefrontal cortex, nucleus accumbens, and caudate-putamen were determined. The effects of dopamine receptors on heroin-induced impulsivity in the 5-choice serial reaction time task were examined by agonist/antagonist treatment on D1 or D3 receptor mutant mice. RESULTS Systemic heroin administration influences several variables in the 5-choice serial reaction time task, most notably premature responses, a measure of motor impulsivity. These behavioral impairments are associated with increased D1 receptor and decreased D3 receptor mRNA and protein levels in 3 observed brain areas. The heroin-evoked increase in premature responses is mimicked by a D1 agonist and prevented by a D1 antagonist or genetic ablation of the D1 receptor gene. In contrast, a D3 agonist decreases both basal and heroin-evoked premature responses, while genetic ablation of the D3 receptor gene results in increased basal and heroin-evoked premature responses. CONCLUSIONS Heroin-induced impulsive behavior in the 5-choice serial reaction time task is oppositely modulated by D1 and D3 receptor activation. The D1 receptors in the cortical-mesolimbic region play an indispensable role in modulating such behaviors.
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Affiliation(s)
- Yongsheng Zhu
- College of Forensic Science, Xi’an Jiaotong University, Xi’an, Shaanxi, China (Drs Zhu, Wang, Lai, Wei, Zhang, Yan, Li, and Qiao and Ms Yin); Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi’an, Shaanxi, China (Drs Lai and Wei)
| | - Yunpeng Wang
- College of Forensic Science, Xi’an Jiaotong University, Xi’an, Shaanxi, China (Drs Zhu, Wang, Lai, Wei, Zhang, Yan, Li, and Qiao and Ms Yin); Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi’an, Shaanxi, China (Drs Lai and Wei)
| | - Jianghua Lai
- College of Forensic Science, Xi’an Jiaotong University, Xi’an, Shaanxi, China (Drs Zhu, Wang, Lai, Wei, Zhang, Yan, Li, and Qiao and Ms Yin); Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi’an, Shaanxi, China (Drs Lai and Wei)
| | - Shuguang Wei
- College of Forensic Science, Xi’an Jiaotong University, Xi’an, Shaanxi, China (Drs Zhu, Wang, Lai, Wei, Zhang, Yan, Li, and Qiao and Ms Yin); Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi’an, Shaanxi, China (Drs Lai and Wei)
| | - Hongbo Zhang
- College of Forensic Science, Xi’an Jiaotong University, Xi’an, Shaanxi, China (Drs Zhu, Wang, Lai, Wei, Zhang, Yan, Li, and Qiao and Ms Yin); Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi’an, Shaanxi, China (Drs Lai and Wei)
| | - Peng Yan
- College of Forensic Science, Xi’an Jiaotong University, Xi’an, Shaanxi, China (Drs Zhu, Wang, Lai, Wei, Zhang, Yan, Li, and Qiao and Ms Yin); Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi’an, Shaanxi, China (Drs Lai and Wei)
| | - Yunxiao Li
- College of Forensic Science, Xi’an Jiaotong University, Xi’an, Shaanxi, China (Drs Zhu, Wang, Lai, Wei, Zhang, Yan, Li, and Qiao and Ms Yin); Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi’an, Shaanxi, China (Drs Lai and Wei)
| | - Xiaomeng Qiao
- College of Forensic Science, Xi’an Jiaotong University, Xi’an, Shaanxi, China (Drs Zhu, Wang, Lai, Wei, Zhang, Yan, Li, and Qiao and Ms Yin); Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi’an, Shaanxi, China (Drs Lai and Wei)
| | - Fangyuan Yin
- College of Forensic Science, Xi’an Jiaotong University, Xi’an, Shaanxi, China (Drs Zhu, Wang, Lai, Wei, Zhang, Yan, Li, and Qiao and Ms Yin); Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi’an, Shaanxi, China (Drs Lai and Wei)
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Matchynski-Franks JJ, Susick LL, Schneider BL, Perrine SA, Conti AC. Impaired Ethanol-Induced Sensitization and Decreased Cannabinoid Receptor-1 in a Model of Posttraumatic Stress Disorder. PLoS One 2016; 11:e0155759. [PMID: 27186643 PMCID: PMC4871361 DOI: 10.1371/journal.pone.0155759] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Accepted: 04/13/2016] [Indexed: 12/02/2022] Open
Abstract
BACKGROUND AND PURPOSE Impaired striatal neuroplasticity may underlie increased alcoholism documented in those with posttraumatic stress disorder (PTSD). Cannabinoid receptor-1 (CB1) is sensitive to the effects of ethanol (EtOH) and traumatic stress, and is a critical regulator of striatal plasticity. To investigate CB1 involvement in the PTSD-alcohol interaction, this study measured the effects of traumatic stress using a model of PTSD, mouse single-prolonged stress (mSPS), on EtOH-induced locomotor sensitization and striatal CB1 levels. METHODS Mice were exposed to mSPS, which includes: 2-h restraint, 10-min group forced swim, 15-min exposure to rat bedding odor, and diethyl ether exposure until unconsciousness or control conditions. Seven days following mSPS exposure, the locomotor sensitizing effects of EtOH were assessed. CB1, post-synaptic density-95 (PSD95), and dopamine-2 receptor (D2) protein levels were then quantified in the dorsal striatum using standard immunoblotting techniques. RESULTS Mice exposed to mSPS-EtOH demonstrated impaired EtOH-induced locomotor sensitization compared to Control-EtOH mice, which was accompanied by reduced striatal CB1 levels. EtOH increased striatal PSD95 in control and mSPS-exposed mice. Additionally, mSPS-Saline exposure increased striatal PSD95 and decreased D2 protein expression, with mSPS-EtOH exposure alleviating these changes. CONCLUSIONS These data indicate that the mSPS model of PTSD blunts the behavioral sensitizing effects of EtOH, a response that suggests impaired striatal neuroplasticity. Additionally, this study demonstrates that mice exposed to mSPS and repeated EtOH exposure decreases CB1 in the striatum, providing a mechanism of interest for understanding the effects of EtOH following severe, multimodal stress exposure.
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Affiliation(s)
- Jessica J. Matchynski-Franks
- Research Service, John D. Dingell VA Medical Center, Detroit, Michigan, United States of America
- Department of Neurosurgery, Wayne State University School of Medicine, Detroit, Michigan, United States of America
| | - Laura L. Susick
- Research Service, John D. Dingell VA Medical Center, Detroit, Michigan, United States of America
- Department of Neurosurgery, Wayne State University School of Medicine, Detroit, Michigan, United States of America
| | - Brandy L. Schneider
- Research Service, John D. Dingell VA Medical Center, Detroit, Michigan, United States of America
- Department of Neurosurgery, Wayne State University School of Medicine, Detroit, Michigan, United States of America
| | - Shane A. Perrine
- Department of Psychiatry and Behavioral Neurosciences, Wayne State University School of Medicine, Detroit, Michigan, United States of America
| | - Alana C. Conti
- Research Service, John D. Dingell VA Medical Center, Detroit, Michigan, United States of America
- Department of Neurosurgery, Wayne State University School of Medicine, Detroit, Michigan, United States of America
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Bell RL, Hauser S, Rodd ZA, Liang T, Sari Y, McClintick J, Rahman S, Engleman EA. A Genetic Animal Model of Alcoholism for Screening Medications to Treat Addiction. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2016; 126:179-261. [PMID: 27055615 PMCID: PMC4851471 DOI: 10.1016/bs.irn.2016.02.017] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The purpose of this review is to present up-to-date pharmacological, genetic, and behavioral findings from the alcohol-preferring P rat and summarize similar past work. Behaviorally, the focus will be on how the P rat meets criteria put forth for a valid animal model of alcoholism with a highlight on its use as an animal model of polysubstance abuse, including alcohol, nicotine, and psychostimulants. Pharmacologically and genetically, the focus will be on the neurotransmitter and neuropeptide systems that have received the most attention: cholinergic, dopaminergic, GABAergic, glutamatergic, serotonergic, noradrenergic, corticotrophin releasing hormone, opioid, and neuropeptide Y. Herein, we sought to place the P rat's behavioral and neurochemical phenotypes, and to some extent its genotype, in the context of the clinical literature. After reviewing the findings thus far, this chapter discusses future directions for expanding the use of this genetic animal model of alcoholism to identify molecular targets for treating drug addiction in general.
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Affiliation(s)
- R L Bell
- Institute of Psychiatric Research, Indiana University School of Medicine, Indianapolis, IN, United States.
| | - S Hauser
- Institute of Psychiatric Research, Indiana University School of Medicine, Indianapolis, IN, United States
| | - Z A Rodd
- Institute of Psychiatric Research, Indiana University School of Medicine, Indianapolis, IN, United States
| | - T Liang
- Indiana University School of Medicine, Indianapolis, IN, United States
| | - Y Sari
- University of Toledo, Toledo, OH, United States
| | - J McClintick
- Center for Medical Genomics, Indiana University School of Medicine, Indianapolis, IN, United States
| | - S Rahman
- Department of Pharmaceutical Sciences, South Dakota State University, Brookings, SD, United States
| | - E A Engleman
- Institute of Psychiatric Research, Indiana University School of Medicine, Indianapolis, IN, United States
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Czoty PW. Effects of chronic binge-like ethanol consumption on cocaine self-administration in rhesus monkeys. Drug Alcohol Depend 2015; 153:278-85. [PMID: 26048636 PMCID: PMC4509795 DOI: 10.1016/j.drugalcdep.2015.05.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 05/01/2015] [Accepted: 05/04/2015] [Indexed: 01/08/2023]
Abstract
BACKGROUND Most cocaine abusers also abuse alcohol, but little is known about interactions that promote co-abuse. These experiments in rhesus monkeys determined the effects of >8 weeks of ethanol (EtOH) consumption on cocaine self-administration (n=6), effects of dopamine (DA) receptor antagonists on cocaine reinforcement (n=3-4 per drug) and the ability of the D2-like DA receptor agonist quinpirole to elicit yawning (n=3). METHODS Monkeys self-administered cocaine (0.0-1.0mg/kg/injection, i.v.) under a 300-s fixed-interval schedule and the above-listed variables were measured before EtOH exposure. Next, monkeys consumed a sweetened, 4% EtOH solution in the home cage under binge-like conditions: 1h, 5 days/week with daily intake equaling 2.0g/kg EtOH. After approximately 8 weeks, measures were re-determined, then EtOH drinking was discontinued. Finally, acute effects of EtOH on cocaine self-administration were determined by infusing EtOH (0.0-1.0g/kg. i.v.) prior to cocaine self-administration sessions (n=4). RESULTS In five of six monkeys, EtOH drinking increased self-administration of low cocaine doses but did not alter reinforcing effects of higher doses. Self-administration returned to baseline after EtOH access was terminated (n=3). Effects of DA receptor antagonists on cocaine self-administration were not consistently altered after EtOH consumption, but the ability of quinpirole to induce yawning was enhanced in two of three monkeys. Acute EtOH infusions only decreased self-administration of lower cocaine doses. CONCLUSIONS Taken together, the data suggest that long-term EtOH exposure can increase sensitivity to cocaine, possibly by increasing D3 receptor sensitivity. Data do not support a role for acute pharmacological interactions in promoting cocaine/EtOH co-abuse.
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Affiliation(s)
- Paul W. Czoty
- Department of Physiology and Pharmacology, Wake Forest School of Medicine, Winston-Salem, NC 27157-1083
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Jiménez-Urbieta H, Gago B, de la Riva P, Delgado-Alvarado M, Marin C, Rodriguez-Oroz MC. Dyskinesias and impulse control disorders in Parkinson's disease: From pathogenesis to potential therapeutic approaches. Neurosci Biobehav Rev 2015. [PMID: 26216865 DOI: 10.1016/j.neubiorev.2015.07.010] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Dopaminergic treatment in Parkinson's disease (PD) reduces the severity of motor symptoms of the disease. However, its chronic use is associated with disabling motor and behavioral side effects, among which levodopa-induced dyskinesias (LID) and impulse control disorders (ICD) are the most common. The underlying mechanisms and pathological substrate of these dopaminergic complications are not fully understood. Recently, the refinement of imaging techniques and the study of the genetics and molecular bases of LID and ICD indicate that, although different, they could share some features. In addition, animal models of parkinsonism with LID have provided important knowledge about mechanisms underlying such complications. In contrast, animal models of parkinsonism and abnormal impulsivity, although useful regarding some aspects of human ICD, do not fully resemble the clinical phenotype of ICD in patients with PD, and until now have provided limited information. Studies on animal models of addiction could complement the previous models and provide some insights into the background of these behavioral complications given that ICD are regarded as behavioral addictions. Here we review the most relevant advances in relation to imaging, genetics, biochemistry and pharmacological interventions to treat LID and ICD in patients with PD and in animal models with a view to better understand the overlapping and unique maladaptations to dopaminergic therapy that are associated with LID and ICD.
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Affiliation(s)
- Haritz Jiménez-Urbieta
- Biodonostia Research Institute, 20014 San Sebastián, Spain; Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Spain.
| | - Belén Gago
- Biodonostia Research Institute, 20014 San Sebastián, Spain; Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Spain.
| | | | - Manuel Delgado-Alvarado
- Biodonostia Research Institute, 20014 San Sebastián, Spain; Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Spain.
| | - Concepció Marin
- INGENIO, IRCE, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS) , 08036 Barcelona, Spain.
| | - María C Rodriguez-Oroz
- Biodonostia Research Institute, 20014 San Sebastián, Spain; Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Spain; University Hospital Donostia, 20014 San Sebastián, Spain; Ikerbasque (Basque Foundation for Science), 48011 Bilbao, Spain.
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Ravan S, Martinez D, Slifstein M, Abi-Dargham A. Molecular imaging in alcohol dependence. HANDBOOK OF CLINICAL NEUROLOGY 2014; 125:293-311. [PMID: 25307582 DOI: 10.1016/b978-0-444-62619-6.00018-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The cellular mechanisms of alcohol's effects in the brain are complex, targeting multiple transmitter systems. Molecular imaging has been used to study the effects of alcohol and alcohol use disorders on these various systems. Studies of dopaminergic indices have provided robust evidence for deficits in D2-mediated transmission in the striatum of chronic recently detoxified alcoholics. Their presence in the at-risk state prior to excessive drinking, and their recovery after long-term sobriety, are unclear and represent an active area of current research. Investigations of the GABAergic system have shown generalized deficits in various brain regions in the chronic abstinence phase. Studies of the opiate system have suggested alterations in some subtypes in discrete brain regions, including the ventral striatum, while studies of serotonin have been negative and those of the cannabinoid system have been inconclusive. Future investigations should target the glutamatergic system, which plays an important role both in the acute intoxicating effects of alcohol as well as in the long-term effects associated with dependence.
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Affiliation(s)
- Shervin Ravan
- Department of Radiology, Columbia University College of Physicians and Surgeons, New York, NY, USA
| | - Diana Martinez
- Department of Psychiatry, Columbia University College of Physicians and Surgeons, New York, NY, USA
| | - Mark Slifstein
- Department of Psychiatry, Columbia University College of Physicians and Surgeons, New York, NY, USA
| | - Anissa Abi-Dargham
- Department of Radiology, Columbia University College of Physicians and Surgeons, New York, NY, USA; Department of Psychiatry, Columbia University College of Physicians and Surgeons, New York, NY, USA.
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Abstract
Nurses have demonstrated concern for years about their interactions with pregnant women who abuse drugs. Reports of nurses' concern with substance abuse have been reported in the literature since the 1980s. As with any chronic disease, drug addiction causes physiologic changes, and the pathology that occurs in the brain drives characteristic behaviors. Research suggests that choices that addicts make are driven by pathology rather than by failure of a moral compass. This article reviews the theoretical explanations for addictive behaviors, describes the pathophysiology of drug addiction that is responsible for the predictable symptoms and behaviors exhibited by women who abuse prescription drugs and other opioids, and identifies nursing interventions to impact positive outcomes. Nurses who have a working knowledge of this disease will provide more effective nursing care to the women they encounter and are better prepared to make a difference in the lives of both women and their children.
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Hanlon CA, Canterberry M. The use of brain imaging to elucidate neural circuit changes in cocaine addiction. Subst Abuse Rehabil 2012; 3:115-128. [PMID: 23162375 PMCID: PMC3499034 DOI: 10.2147/sar.s35153] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Within substance abuse, neuroimaging has experienced tremendous growth as both a research method and a clinical tool in the last decade. The application of functional imaging methods to cocaine dependent patients and individuals in treatment programs, has revealed that the effects of cocaine are not limited to dopamine-rich subcortical structures, but that the cortical projection areas are also disrupted in cocaine dependent patients. In this review, we will first describe several of the imaging methods that are actively being used to address functional and structural abnormalities in addiction. This will be followed by an overview of the cortical and subcortical brain regions that are most often cited as dysfunctional in cocaine users. We will also introduce functional connectivity analyses currently being used to investigate interactions between these cortical and subcortical areas in cocaine users and abstainers. Finally, this review will address recent research which demonstrates that alterations in the functional connectivity in cocaine users may be associated with structural pathology in these circuits, as demonstrated through diffusion tensor imaging. Through the use of these tools in both a basic science setting and as applied to treatment seeking individuals, we now have a greater understanding of the complex cortical and subcortical networks which contribute to the stages of initial craving, dependence, abstinence, and relapse. Although the ability to use neuroimaging to predict treatment response or identify vulnerable populations is still in its infancy, the next decade holds tremendous promise for using neuroimaging to tailor either behavioral or pharmacologic treatment interventions to the individual.
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Affiliation(s)
- Colleen A Hanlon
- Department of Psychiatry and Behavioral Sciences, Charleston, SC, USA ; Department of Neurosciences Medical University of South Carolina, Charleston, SC, USA
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Bell RL, Franklin KM, Hauser SR, Zhou FC. Introduction to the special issue "Pharmacotherapies for the treatment of alcohol abuse and dependence" and a summary of patents targeting other neurotransmitter systems. RECENT PATENTS ON CNS DRUG DISCOVERY 2012; 7:93-112. [PMID: 22574678 PMCID: PMC3868366 DOI: 10.2174/157488912800673155] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2012] [Revised: 03/02/2012] [Accepted: 03/13/2012] [Indexed: 12/19/2022]
Abstract
This paper introduces the Special Section: Pharmacotherapies for the Treatment of Alcohol Abuse and Dependence and provides a summary of patents targeting neurotransmitter systems not covered in the other four chapters. The World Health Organization notes that alcoholic-type drinking results in 2.5 million deaths per year, and these deaths occur to a disproportionately greater extent among adolescents and young adults. Developing a pharmacological treatment targeting alcohol abuse and dependence is complicated by (a) the heterogeneous nature of the disease(s), (b) alcohol affecting multiple neurotransmitter and neuromodulator systems, and (c) alcohol affecting multiple organ systems which in turn influence the function of the central nervous system. Presently, the USA Federal Drug Administration has approved three pharmacotherapies for alcoholism: disulfiram, naltrexone, and acamprosate. This chapter provides a summary of the following systems, which are not covered in the accompanying chapters; alcohol and acetaldehyde metabolism, opioid, glycinergic, GABA-A, neurosteroid, dopaminergic, serotonergic, and endocannabinoid, as well as patents targeting these systems for the treatment of alcoholism. Finally, an overview is presented on the use of pharmacogenetics and pharmacogenomics in tailoring treatments for certain subpopulations of alcoholics, which is expected to continue in the future.
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Affiliation(s)
- Richard L. Bell
- Indiana University School of Medicine, Department of Psychiatry, Institute of Psychiatric Research, 791 Union Drive, Indianapolis, Indiana, 46202, USA
| | - Kelle M. Franklin
- Indiana University School of Medicine, Department of Psychiatry, Institute of Psychiatric Research, 791 Union Drive, Indianapolis, Indiana, 46202, USA
| | - Sheketha R. Hauser
- Indiana University School of Medicine, Department of Psychiatry, Institute of Psychiatric Research, 791 Union Drive, Indianapolis, Indiana, 46202, USA
| | - Feng C. Zhou
- Indiana University School of Medicine, Department of Anatomy and Cell Biology, 635 Barnhill Drive MS-508, Indian-apolis, Indiana, 46202, USA
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The effects of cannabinoid CB1, CB2 and vanilloid TRPV1 receptor antagonists on cocaine addictive behavior in rats. Brain Res 2012; 1444:45-54. [DOI: 10.1016/j.brainres.2012.01.030] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2011] [Revised: 12/19/2011] [Accepted: 01/12/2012] [Indexed: 12/11/2022]
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Adamczyk P, Faron-Górecka A, Kuśmider M, Dziedzicka-Wasylewska M, Papp M, Filip M. Long-lasting increase in [³H]CP55,940 binding to CB1 receptors following cocaine self-administration and its withdrawal in rats. Brain Res 2012; 1451:34-43. [PMID: 22425184 DOI: 10.1016/j.brainres.2012.02.052] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Revised: 02/09/2012] [Accepted: 02/19/2012] [Indexed: 02/03/2023]
Abstract
The present work has aimed on the neuroadaptive changes in CB1 receptor density that are evoked by self-administered cocaine use and subsequent withdrawal in rats. We employed a quantitative autoradiographic analysis using labeled [³H]CP55,940, a CB1 receptor agonist. To distinguish the passive pharmacological effects of cocaine from those related to motivation and the cognitive processes evoked by active cocaine self-administration, the "yoked" procedure was used. Our results demonstrate that repeated cocaine administration over 14 days induced up-regulation of CB1 receptors in the cortical and subcortical brain areas of animals who received cocaine, whether the cocaine was actively self-administered or received passively (the "yoked" control group) and that the neuroadaptation of CB1 receptors persisted after the 10-day extinction phase. On the other hand, we found that only self-administering rats showed CB1 receptor up-regulation in numerous brain areas, which suggests that these structures may be directly linked to CB1 receptor control over motivational and cognitive processes. Moreover, the observed increase in [³H]CP55,940 binding in these brain areas likely indicates long-lasting neurobiological adaptations resulting from chronic cocaine self-administration. In conclusion, we demonstrated that chronic cocaine self-administration leads to increased CB1 receptor levels in numerous brain areas and that this neuroadaptation is maintained over a long-lasting extinction period.
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Affiliation(s)
- Przemysław Adamczyk
- Laboratory of Drug Addiction Pharmacology, Department of Pharmacology, Institute of Pharmacology Polish Academy of Sciences, Krakow, Poland.
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Graham MM. Clinical molecular imaging with radiotracers: current status. Med Princ Pract 2012; 21:197-208. [PMID: 22142905 DOI: 10.1159/000333552] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2011] [Accepted: 09/05/2011] [Indexed: 12/17/2022] Open
Abstract
Molecular imaging is defined as the visualization, characterization, and measurement of biological processes at the molecular and cellular levels in humans and other living systems. Most clinical molecular imaging is currently done using radioisotope-labeled agents to define the activity of various metabolic pathways in vivo or to determine the distribution and density of various receptors relevant to human disease. This paper briefly reviews most of the commonly used radiopharmaceuticals in nuclear medicine, as well as newer agents that are likely to become available in the near future. The metabolic pathways include those relevant to the thyroid, parathyroid, heart, brain, bones, kidneys, liver, pancreas, adrenals and tumor. The receptor systems include agents useful in evaluating movement disorders, dementia, cardiac sympathetic enervation and neoangiogenesis. Receptor systems relevant to tumors include somatostatin receptors (neuroendocrine tumors), prostate-specific membrane antigen, carbonic anhydrase IX (renal cancer), and CD-20 (lymphoma). These agents, and newer agents that are being developed, are likely to become critical in the development of personalized medicine, where it will become increasingly important to determine whether a treatment that is targeted to a specific metabolic pathway or receptor is likely to be successful.
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Affiliation(s)
- Michael M Graham
- Department of Radiology, University of Iowa, Iowa City, Iowa, USA.
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Abstract
The application of genomic medicine to the treatment of nicotine dependence holds great promise for revitalizing the steady decline in smoking rates witnessed in the USA over the past several decades. This paper examines the current knowledge base concerning the use of biomarkers to guide the selection of nicotine dependence treatments. First, we review the neurobiology of nicotine dependence and present evidence that supports its heritability. We then discuss the various studies of pharmacokinetic and pharmacodynamic genes related to therapeutic response. Current evidence suggests that biomarkers of genetic variability in both nicotine metabolism, referred to as the nicotine metabolite ratio, and dopamine genotypes may be useful for guiding treatment selection for nicotine dependence. Barriers to the translation of this research to clinical practice are discussed, as are directions for future research.
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Affiliation(s)
- Robert A Schnoll
- Pulmonary, Allergy & Critical Care Division, University of Pennsylvania, Presbyterian Medical Center -1 PHI, 51 N 39th Street, Philadelphia, PA 19104, USA.
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Frank GK, Reynolds JR, Shott ME, O’Reilly RC. Altered temporal difference learning in bulimia nervosa. Biol Psychiatry 2011; 70:728-735. [PMID: 21718969 PMCID: PMC3186835 DOI: 10.1016/j.biopsych.2011.05.011] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2011] [Revised: 05/05/2011] [Accepted: 05/12/2011] [Indexed: 01/02/2023]
Abstract
BACKGROUND The neurobiology of bulimia nervosa (BN) is poorly understood. Recent animal literature suggests that binge eating is associated with altered brain dopamine (DA) reward function. In this study, we wanted to investigate DA-related brain reward learning in BN. METHODS Ill BN (n = 20, age: mean = 25.2, SD = 5.3 years) and healthy control women (CW) (n = 23, age: mean = 27.2, SD = 6.4 years) underwent functional magnetic resonance brain imaging together with application of a DA-related reward learning paradigm, the temporal difference (TD) model. That task involves association learning between conditioned visual and unconditioned taste stimuli, as well as unexpected violation of those learned associations. Study participants also completed the Sensitivity to Reward and Punishment Questionnaire. RESULTS Bulimia nervosa individuals showed reduced brain response compared with CW for unexpected receipt and omission of taste stimuli, as well as reduced brain regression response to the TD computer model generated reward values, in insula, ventral putamen, amygdala, and orbitofrontal cortex. Those results were qualitatively similar in BN individuals who were nondepressed and unmedicated. Binge/purge frequency in BN inversely predicted reduced TD model response. Bulimia nervosa individuals showed significantly higher Sensitivity to Reward and Punishment compared with CW. CONCLUSIONS This is the first study that relates reduced brain DA responses in BN to the altered learning of associations between arbitrary visual stimuli and taste rewards. This attenuated response is related to frequency of binge/purge episodes in BN. The brain DA neurotransmitter system could be an important treatment target for BN.
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Affiliation(s)
- Guido K.W. Frank
- Department of Psychiatry, University of Colorado Denver, The Children’s Hospital, Aurora, CO80045, USA, Department of Neuroscience, University of Colorado Denver; Anschutz Medical Campus, Aurora, CO 80045, USA
| | | | - Megan E. Shott
- Department of Psychiatry, University of Colorado Denver, The Children’s Hospital, Aurora, CO80045, USA
| | - Randall C. O’Reilly
- Department of Psychology and Neuroscience, University of Colorado Boulder, Boulder, CO 80309, USA
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