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Doyle MR, Beltran NM, Bushnell MSA, Syed M, Acosta V, Desai M, Rice KC, Serafine KM, Gould GG, Daws LC, Collins GT. Effects of access condition on substance use disorder-like phenotypes in male and female rats self-administering MDPV or cocaine. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.03.04.583431. [PMID: 38496609 PMCID: PMC10942381 DOI: 10.1101/2024.03.04.583431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/19/2024]
Abstract
Substance use disorder (SUD) is a heterogeneous disorder, where severity, symptoms, and patterns of substance use vary across individuals. Yet, when rats are allowed to self-administer drugs such as cocaine under short-access conditions, their behavior tends to be well-regulated and homogeneous in nature; though individual differences can emerge when rats are provided long- or intermittent-access to cocaine. In contrast to cocaine, significant individual differences emerge when rats are allowed to self-administer 3,4-methylenedioxypyrovalerone (MDPV), even under short-access conditions, wherein ~30% of rats rapidly transition to high levels of drug-taking. This study assessed the SUD-like phenotypes of male and female Sprague Dawley rats self-administering MDPV (0.032 mg/kg/infusion) or cocaine (0.32 mg/kg/infusion) by comparing level of drug intake, responding during periods of signaled drug unavailability, and sensitivity to footshock punishment to test the hypotheses that: (1) under short-access conditions, rats that self-administer MDPV will exhibit a more robust SUD-like phenotype than rats that self-administered cocaine; (2) female rats will have a more severe phenotype than male rats; and (3) compared to short-access, long- and intermittent-access to MDPV or cocaine self-administration will result in a more robust SUD-like phenotype. After short-access, rats that self-administered MDPV exhibited a more severe phenotype than rats that self-administered cocaine. Though long- and intermittent-access to cocaine and MDPV self-administration altered drug-taking patterns, manipulating access conditions did not systematically alter their SUD-like phenotype. Evidence from behavioral and quantitative autoradiography studies suggest that these differences are unlikely due to changes in expression levels of dopamine transporter, dopamine D2 or D3 receptors, or 5-HT1B, 5-HT2A, or 5-HT2C receptors, though these possibilities cannot be ruled out. These results show that the phenotype exhibited by rats self-administering MDPV differs from that observed for rats self-administering cocaine, and suggests that individuals that use MDPV and/or related cathinones may be at greater risk for developing a SUD, and that short-access MDPV self-administration may provide a useful method to understand the factors that mediate the transition to problematic or disordered substance use in humans.
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Affiliation(s)
- Michelle R. Doyle
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Nina M. Beltran
- Department of Psychology, University of Texas at El Paso, El Paso, TX, USA
| | - Mark S. A. Bushnell
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Maaz Syed
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Valeria Acosta
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Marisa Desai
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Kenner C. Rice
- Drug Design and Synthesis Section, Molecular Targets and Medications Discovery Branch National Institute on Drug Abuse and National Institute on Alcohol Abuse and Alcoholism - Intramural Research Program, Bethesda, MD
| | | | - Georgianna G. Gould
- Department of Cellular and Integrative Physiology, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Lynette C. Daws
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
- Department of Cellular and Integrative Physiology, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Gregory T. Collins
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
- South Texas Veterans Health Care System, San Antonio, TX, USA
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Jastrzębska J, Daniel WA. Cocaine-Induced Time-Dependent Alterations in Cytochrome P450 and Liver Function. Int J Mol Sci 2023; 24:ijms24021632. [PMID: 36675146 PMCID: PMC9866935 DOI: 10.3390/ijms24021632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2022] [Revised: 12/27/2022] [Accepted: 01/09/2023] [Indexed: 01/18/2023] Open
Abstract
Cytochrome P450 is responsible for the metabolism of endogenous substrates, drugs and substances of abuse. The brain and nervous system regulate liver cytochrome P450 via neuroendocrine mechanisms, as shown in rodents. Cocaine exerts its addictive effects through the dopaminergic system, the functioning of which undergoes changes during its continuous use. Therefore, it can be hypothesized that the regulation of cytochrome P450 by cocaine may also alter during the addiction process, cessation and relapse. We analyzed preclinical studies on the mechanisms of the pharmacological action of cocaine, the role of the brain's dopaminergic system in the neuroendocrine regulation of cytochrome P450 and the in vitro and in vivo effects of cocaine on the cytochrome P450 expression/activity and hepatotoxicity. The results of passive cocaine administration indicate that cocaine affects liver cytochrome P450 enzymes (including those engaged in its own metabolism) via different mechanisms involving the expression of genes encoding cytochrome P450 enzymes and interaction with enzyme proteins. Thus, it may affect its own oxidative metabolism and the metabolism of endogenous substrates and other co-administered drugs and may lead to hepatotoxicity. Its effect depends on the specific cytochrome P450 enzyme affected, cocaine dosage, treatment duration and animal species. However, further complementary studies are needed to find out whether cocaine affects cytochrome P450 via the brain's dopaminergic system. The knowledge of cocaine's effect on cytochrome P450 function during the entire addiction process is still incomplete. There is a lack of information on the enzyme expression/activity in animals self-administering cocaine (addicted), in those withdrawn after cocaine self-administration, and during relapse in animals previously addicted; furthermore, there is no such information concerning humans. The subject of cytochrome P450 regulation by cocaine during the addiction process is an open issue, and addressing this topic may help in the treatment of drug abuse patients.
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Spelta LEW, Torres YYS, de Oliveira SCWSEF, Yonamine M, Bailey A, Camarini R, Garcia RCT, Marcourakis T. Chronic escalating-dose and acute binge cocaine treatments change the hippocampal cholinergic muscarinic system on drug presence and after withdrawal. Toxicol Appl Pharmacol 2022; 447:116068. [PMID: 35597300 DOI: 10.1016/j.taap.2022.116068] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 04/22/2022] [Accepted: 05/13/2022] [Indexed: 12/21/2022]
Abstract
Cocaine addiction is a relapsing disorder with loss of control in limiting drug intake. Considering the involvement of acetylcholine in the neurobiology of the disease, our aim was to evaluate whether cocaine induces plastic changes in the hippocampal cholinergic muscarinic system. Male Swiss-Webster mice received saline or cocaine (ip) three times daily (60-min intervals) either acutely or in an escalating-dose binge paradigm for 14 days. Locomotor activity was measured in all treatment days. Dopaminergic and cholinergic muscarinic receptors (D1R, D2R, M1-M5, mAChRs), choline acetyltransferase (ChAT), vesicular acetylcholine transporter (VAChT) and acetylcholinesterase (AChE) were quantified in the hippocampus by immunoblotting one hour after the last injection (on drug) or after 14 days of abstinence (withdrawal). Escalating-dose group showed cocaine-induced locomotor sensitization from day 2. M3 mAChR and ChAT significantly increased after the on-drug acute binge treatment. Escalating-dose on-drug group showed increased ChAT, M1, M5 mAChR and D2R; and decreased D1R. Acute-binge withdrawal group showed increased VAChT, M2 mAChR, D1R, and D2R; and decreased M1 mAChR. Escalating-dose withdrawal group presented increased D1R and VAChT and decreased M1 mAChR and D2R. Locomotor activity was negatively correlated with M1 mAChR and AChE in on-drug group and positively correlated with VAChT in withdrawal group. M1 mAChR was positively correlated with M2 mAChR and ChAT in on-drug group, whereas ChAT was positively correlated with M5 mAChR in withdrawal group. The results indicate that cocaine induced an increase in the hippocampal cholinergic tone in the presence of the drug, whereas withdrawal causes a resetting in the system.
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Affiliation(s)
- Lidia E W Spelta
- Department of Clinical and Toxicological Analysis, School of Pharmaceutical Sciences, University of São Paulo, Av. Prof. Lineu Prestes, 580, Bl. 13B, 05508-000 São Paulo/SP, Brazil
| | - Yuli Y S Torres
- Department of Clinical and Toxicological Analysis, School of Pharmaceutical Sciences, University of São Paulo, Av. Prof. Lineu Prestes, 580, Bl. 13B, 05508-000 São Paulo/SP, Brazil
| | - Sarah C W S E F de Oliveira
- Department of Clinical and Toxicological Analysis, School of Pharmaceutical Sciences, University of São Paulo, Av. Prof. Lineu Prestes, 580, Bl. 13B, 05508-000 São Paulo/SP, Brazil; Pharmacosciences Department, Federal University of Health Sciences of Porto Alegre, Porto Alegre, RS 90050-170, Brazil
| | - Maurício Yonamine
- Department of Clinical and Toxicological Analysis, School of Pharmaceutical Sciences, University of São Paulo, Av. Prof. Lineu Prestes, 580, Bl. 13B, 05508-000 São Paulo/SP, Brazil
| | - Alexis Bailey
- Pharmacology Section, Institute of Medical and Biomedical Education, St George's University of London, Cranmer Terrace, SW17 0RE London, UK
| | - Rosana Camarini
- Department of Pharmacology, Laboratory of Neurochemical and Behavior Pharmacology, Institute of Biomedical Sciences, University of São Paulo, Av. Prof. Lineu Prestes, 1524, Prédio 1, 05508-900 São Paulo/SP, Brazil.
| | - Raphael C T Garcia
- Institute of Environmental, Chemical and Pharmaceutical Sciences, Federal University of São Paulo, Rua São Nicolau, 210, 1° andar, 09913-030 Diadema/SP, Brazil.
| | - Tania Marcourakis
- Department of Clinical and Toxicological Analysis, School of Pharmaceutical Sciences, University of São Paulo, Av. Prof. Lineu Prestes, 580, Bl. 13B, 05508-000 São Paulo/SP, Brazil.
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D'Elia A, Schiavi S, Soluri A, Massari R, Soluri A, Trezza V. Role of Nuclear Imaging to Understand the Neural Substrates of Brain Disorders in Laboratory Animals: Current Status and Future Prospects. Front Behav Neurosci 2020; 14:596509. [PMID: 33362486 PMCID: PMC7759612 DOI: 10.3389/fnbeh.2020.596509] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Accepted: 11/23/2020] [Indexed: 12/18/2022] Open
Abstract
Molecular imaging, which allows the real-time visualization, characterization and measurement of biological processes, is becoming increasingly used in neuroscience research. Scintigraphy techniques such as single photon emission computed tomography (SPECT) and positron emission tomography (PET) provide qualitative and quantitative measurement of brain activity in both physiological and pathological states. Laboratory animals, and rodents in particular, are essential in neuroscience research, providing plenty of models of brain disorders. The development of innovative high-resolution small animal imaging systems together with their radiotracers pave the way to the study of brain functioning and neurotransmitter release during behavioral tasks in rodents. The assessment of local changes in the release of neurotransmitters associated with the performance of a given behavioral task is a turning point for the development of new potential drugs for psychiatric and neurological disorders. This review addresses the role of SPECT and PET small animal imaging systems for a better understanding of brain functioning in health and disease states. Brain imaging in rodent models faces a series of challenges since it acts within the boundaries of current imaging in terms of sensitivity and spatial resolution. Several topics are discussed, including technical considerations regarding the strengths and weaknesses of both technologies. Moreover, the application of some of the radioligands developed for small animal nuclear imaging studies is discussed. Then, we examine the changes in metabolic and neurotransmitter activity in various brain areas during task-induced neural activation with special regard to the imaging of opioid, dopaminergic and cannabinoid receptors. Finally, we discuss the current status providing future perspectives on the most innovative imaging techniques in small laboratory animals. The challenges and solutions discussed here might be useful to better understand brain functioning allowing the translation of preclinical results into clinical applications.
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Affiliation(s)
- Annunziata D'Elia
- Institute of Biochemistry and Cell Biology, National Research Council of Italy (CNR), Rome, Italy.,Section of Biomedical Sciences and Technologies, Department of Science, University "Roma Tre", Rome, Italy
| | - Sara Schiavi
- Section of Biomedical Sciences and Technologies, Department of Science, University "Roma Tre", Rome, Italy
| | - Andrea Soluri
- Institute of Biochemistry and Cell Biology, National Research Council of Italy (CNR), Rome, Italy
| | - Roberto Massari
- Institute of Biochemistry and Cell Biology, National Research Council of Italy (CNR), Rome, Italy
| | - Alessandro Soluri
- Institute of Biochemistry and Cell Biology, National Research Council of Italy (CNR), Rome, Italy
| | - Viviana Trezza
- Section of Biomedical Sciences and Technologies, Department of Science, University "Roma Tre", Rome, Italy
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Chen R, Ferris MJ, Wang S. Dopamine D2 autoreceptor interactome: Targeting the receptor complex as a strategy for treatment of substance use disorder. Pharmacol Ther 2020; 213:107583. [PMID: 32473160 PMCID: PMC7434700 DOI: 10.1016/j.pharmthera.2020.107583] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Accepted: 05/11/2020] [Indexed: 02/06/2023]
Abstract
Dopamine D2 autoreceptors (D2ARs), located in somatodendritic and axon terminal compartments of dopamine (DA) neurons, function to provide a negative feedback regulatory control on DA neuron firing, DA synthesis, reuptake and release. Dysregulation of D2AR-mediated DA signaling is implicated in vulnerability to substance use disorder (SUD). Due to the extreme low abundance of D2ARs compared to postsynaptic D2 receptors (D2PRs) and the lack of experimental tools to differentiate the signaling of D2ARs from D2PRs, the regulation of D2ARs by drugs of abuse is poorly understood. The recent availability of conditional D2AR knockout mice and newly developed virus-mediated gene delivery approaches have provided means to specifically study the function of D2ARs at the molecular, cellular and behavioral levels. There is a growing revelation of novel mechanisms and new proteins that mediate D2AR activity, suggesting that D2ARs act cooperatively with an array of membrane and intracellular proteins to tightly control DA transmission. This review highlights D2AR-interacting partners including transporters, G-protein-coupled receptors, ion channels, intracellular signaling modulators, and protein kinases. The complexity of the D2AR interaction network illustrates the functional divergence of D2ARs. Pharmacological targeting of multiple D2AR-interacting partners may be more effective to restore disrupted DA homeostasis by drugs of abuse.
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Affiliation(s)
- Rong Chen
- Dept. of Physiology & Pharmacology, Wake Forest School of Medicine, Winston Salem, NC 27157, United States of America; Center for the Neurobiology of Addiction Treatment, Wake Forest School of Medicine, Winston Salem, NC 27157, United States of America.
| | - Mark J Ferris
- Dept. of Physiology & Pharmacology, Wake Forest School of Medicine, Winston Salem, NC 27157, United States of America; Center for the Neurobiology of Addiction Treatment, Wake Forest School of Medicine, Winston Salem, NC 27157, United States of America
| | - Shiyu Wang
- Dept. of Physiology & Pharmacology, Wake Forest School of Medicine, Winston Salem, NC 27157, United States of America
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6
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Environmental enrichment reduces behavioural sensitization in mice previously exposed to toluene: The role of D1 receptors. Behav Brain Res 2020; 390:112624. [DOI: 10.1016/j.bbr.2020.112624] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 03/11/2020] [Accepted: 03/25/2020] [Indexed: 12/20/2022]
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Bernardi RE, Broccoli L, Spanagel R, Hansson AC. Sex differences in dopamine binding and modafinil conditioned place preference in mice. Drug Alcohol Depend 2015; 155:37-44. [PMID: 26342627 DOI: 10.1016/j.drugalcdep.2015.08.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2015] [Revised: 08/21/2015] [Accepted: 08/21/2015] [Indexed: 01/06/2023]
Abstract
BACKGROUND Studies in humans and rodents have demonstrated under certain conditions some reinforcing properties of modafinil, a drug being examined clinically for its potential to treat psychostimulant abuse. However, the majority of rodent studies examining the abuse potential of modafinil have used high doses that may not be clinically relevant. In fact, recent work has indicated that doses similar to those administered to humans are not reinforcing in mice. METHODS The current study examined sex differences in the ability of low-dose modafinil (0.75mg/kg, IP) to induce a conditioned place preference in mice, and assessed sex-dependent alterations in dopamine D1, D2 and DAT binding sites in reward-related regions in naïve and modafinil-treated mice. RESULTS Low-dose modafinil failed to induce a conditioned place preference in male mice, while female mice demonstrated a significant modafinil place preference. Several dopamine binding differences were also detected in naïve and modafinil-treated mice, including sex differences in D1 and D2 availability in reward-related regions, and are discussed in relation to sex-dependent differences in the reinforcing effects of modafinil and psychostimulants in general. CONCLUSIONS These findings implicate sex differences in the reinforcing properties of modafinil in mice, and indicate that clinical evaluation of the sex dependence of the reinforcing properties of modafinil in humans is warranted.
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Affiliation(s)
- Rick E Bernardi
- Institute of Psychopharmacology, Central Institute of Mental Health, Medical Faculty Mannheim/Heidelberg University, J5, 68159, Mannheim, Germany.
| | - Laura Broccoli
- Institute of Psychopharmacology, Central Institute of Mental Health, Medical Faculty Mannheim/Heidelberg University, J5, 68159, Mannheim, Germany
| | - Rainer Spanagel
- Institute of Psychopharmacology, Central Institute of Mental Health, Medical Faculty Mannheim/Heidelberg University, J5, 68159, Mannheim, Germany
| | - Anita C Hansson
- Institute of Psychopharmacology, Central Institute of Mental Health, Medical Faculty Mannheim/Heidelberg University, J5, 68159, Mannheim, Germany
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Tobón KE, Catuzzi JE, Cote SR, Sonaike A, Kuzhikandathil EV. Post-transcriptional regulation of dopamine D1 receptor expression in caudate-putamen of cocaine-sensitized mice. Eur J Neurosci 2015; 42:1849-57. [PMID: 25900179 DOI: 10.1111/ejn.12933] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Revised: 04/14/2015] [Accepted: 04/16/2015] [Indexed: 11/30/2022]
Abstract
The dopamine D1 receptor is centrally involved in mediating the effects of cocaine and is essential for cocaine-induced locomotor sensitization. Changes in D1 receptor expression have been reported in various models of cocaine addiction; however, the mechanisms that mediate these changes in D1 receptor expression are not well understood. Using preadolescent drd1a-EGFP mice and a binge cocaine treatment protocol we demonstrate that the D1 receptor is post-transcriptionally regulated in the caudate-putamen of cocaine-sensitized animal. While cocaine-sensitized mice express high levels of steady-state D1 receptor mRNA, the expression of D1 receptor protein is not elevated. We determined that the post-transcriptional regulation of D1 receptor mRNA is rapidly attenuated and D1 receptor protein levels increase within 30 min when the sensitized mice are challenged with cocaine. The rapid increase in D1 receptor protein levels requires de novo protein synthesis and correlates with the cocaine-induced hyperlocomotor activity in the cocaine-sensitized mice. The increase in D1 receptor protein levels in the caudate-putamen inversely correlated with the levels of microRNA 142-3p and 382, both of which regulate D1 receptor protein expression. The levels of these two microRNAs decreased significantly within 5 min of cocaine challenge in sensitized mice. The results provide novel insights into the previously unknown rapid kinetics of D1 receptor protein expression which occurs in a time scale that is comparable to the expression of immediate early genes. Furthermore, the results suggest a potential novel role for inherently labile microRNAs in regulating the rapid expression of D1 receptor protein in cocaine-sensitized animals.
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Affiliation(s)
- Krishna E Tobón
- Department of Pharmacology and Physiology, Rutgers-New Jersey Medical School, 185 South Orange Avenue, MSB, I-647, Newark, NJ, 07103, USA
| | - Jennifer E Catuzzi
- Department of Pharmacology and Physiology, Rutgers-New Jersey Medical School, 185 South Orange Avenue, MSB, I-647, Newark, NJ, 07103, USA
| | - Samantha R Cote
- Department of Pharmacology and Physiology, Rutgers-New Jersey Medical School, 185 South Orange Avenue, MSB, I-647, Newark, NJ, 07103, USA
| | - Adenike Sonaike
- Department of Pharmacology and Physiology, Rutgers-New Jersey Medical School, 185 South Orange Avenue, MSB, I-647, Newark, NJ, 07103, USA
| | - Eldo V Kuzhikandathil
- Department of Pharmacology and Physiology, Rutgers-New Jersey Medical School, 185 South Orange Avenue, MSB, I-647, Newark, NJ, 07103, USA
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Puig S, Marie N, Benturquia N, Noble F. Influence of cocaine administration patterns on dopamine receptor regulation. Psychopharmacology (Berl) 2014; 231:3131-7. [PMID: 24557089 DOI: 10.1007/s00213-014-3488-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Accepted: 02/05/2014] [Indexed: 11/28/2022]
Abstract
RATIONALE Chronic exposure to drugs of abuse induces important modifications on neuronal systems. Increasing evidence shows that the consequences to chronic cocaine exposure can be different depending on the administration pattern. OBJECTIVES The aim of the present study was to evaluate the consequences of two cocaine administration patterns on dopaminergic receptor regulation. METHODS Male Sprague-Dawley rats were injected with cocaine (20 mg/kg, i.p.) for 14 days according to an intermittent (one daily injection) or a binge (three daily injections) pattern. By autoradiography, we compared the modifications of dopamine D1 and D2 receptor densities in the dopaminergic systems (mesocorticolimbic and nigrostriatal) 1 (WD1) and 14 (WD14) days after the last cocaine injection. RESULTS On WD1, we observed modifications of D1 receptors after the binge cocaine treatment pattern while no modification was observed after the intermittent pattern, suggesting that multiple daily injections are needed to induce early D1 receptor modifications. On the contrary, densities of the D2 receptors were modified by both cocaine administration patterns, and interestingly, they were opposite depending on the administration pattern. On WD14, we observed different modifications of D1 and D2 receptors depending on the administration pattern, suggesting that the cocaine administration pattern promoted long-term regulations of the dopaminergic system. CONCLUSION Two cocaine administration patterns induce different modifications of the dopaminergic receptor densities.
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Affiliation(s)
- Stéphanie Puig
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche 8206, Paris, France
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10
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Epigenetically modified nucleotides in chronic heroin and cocaine treated mice. Toxicol Lett 2014; 229:451-7. [PMID: 25064621 DOI: 10.1016/j.toxlet.2014.07.023] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Revised: 07/21/2014] [Accepted: 07/22/2014] [Indexed: 12/19/2022]
Abstract
Epigenetic changes include the addition of a methyl group to the 5' carbon of the cytosine ring, known as DNA methylation, which results in the generation of the fifth DNA base, namely 5-methylcytosine. During active or passive demethylation, an intermediate modified base is formed, 5-hydroxymethylcytosine. We have currently quantified 5-methylcytosine and 5-hydroxymethylcytosine in the liver and brain of mice treated with cocaine or heroin, using liquid chromatography/tandem mass spectrometry (LC-MS/MS). Our results show that global 5-methylcytosine levels are not affected by heroin or cocaine administration, neither in the liver nor in the brain. However, 5-hydroxymethylcytosine levels are reduced in the liver following cocaine administration, while they are not affected by cocaine in the brain or by heroin administration in the liver and the brain. Elucidation of the epigenetic phenomena that takes place with respect to drug abuse and addiction, via quantitative analysis of different modified bases, may enable a better understanding of the underlying mechanisms and may lead to more personalized and effective treatment options.
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Alves CJ, Magalhães A, Melo P, de Sousa L, Tavares MA, Monteiro PRR, Summavielle T. Long-term effects of chronic cocaine exposure throughout adolescence on anxiety and stress responsivity in a Wistar rat model. Neuroscience 2014; 277:343-55. [PMID: 25047999 DOI: 10.1016/j.neuroscience.2014.07.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Revised: 06/19/2014] [Accepted: 07/08/2014] [Indexed: 01/26/2023]
Abstract
Adolescents display increased vulnerability to engage in drug experimentation. This is often considered a risk factor for later drug abuse. In this scenario, the permanent effects of cocaine exposure during adolescence on anxiety levels and stress responsivity, which may result in behavioral phenotypes prone to addiction, are now starting to be unveiled. Thus, the purpose of the present study was to evaluate the long-lasting effects of chronic cocaine administration during adolescence, on anxiety-like behavior and on stress response. Adolescent male Wistar rats were daily administered 45-mg cocaine/kg of body weight in three equal intraperitoneal doses with 1-h interval, from postnatal day (PND) 35 to 50. The effects of cocaine administration on anxiety levels, assessed in the Elevated Plus Maze (EPM), and on social stress response, assessed in the resident-intruder paradigm (R/I), were evaluated 10 days after withdrawal, when rats were reaching the adulthood. The underlying dopaminergic activity, and the corticosterone and testosterone levels were determined. Our results showed that cocaine induced long-lasting alterations in the hypothalamus-pituitary-adrenals (HPA) axis function and in testosterone levels. Such alterations resulted in significant and enduring changes in behavioral responses to environmental challenges, such as the EPM and R/I, including the evaluation of potential threats that may lead to high-risk behavior and low-benefit choices. This was further supported by an altered dopaminergic function in the amygdala and hippocampus. The present findings provide new insights into how the use of cocaine during adolescent development may modulate emotional behavior later in life. Compromised ability to recognize and deal with potential threats is an important risk factor to perpetuate compulsive drug seeking and relapse susceptibility.
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Affiliation(s)
- C J Alves
- IBMC - Instituto de Biologia Molecular e Celular, Universidade do Porto, Rua do Campo Alegre, 823, 4150-180 Porto, Portugal; INEB - Instituto de Engenharia Biomédica, Universidade do Porto, Rua do Campo Alegre, 823, 4150-180 Porto, Portugal
| | - A Magalhães
- IBMC - Instituto de Biologia Molecular e Celular, Universidade do Porto, Rua do Campo Alegre, 823, 4150-180 Porto, Portugal; ICBAS - Instituto de Ciências Biomédicas Abel Salazar, Universidade de Porto, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal
| | - P Melo
- IBMC - Instituto de Biologia Molecular e Celular, Universidade do Porto, Rua do Campo Alegre, 823, 4150-180 Porto, Portugal; ESTSP - Escola Superior de Tecnologia da Saúde do Porto, Instituto Politécnico do Porto, Rua Valente Perfeito, 322, 4400-330 Vila Nova de Gaia, Portugal
| | - L de Sousa
- ICBAS - Instituto de Ciências Biomédicas Abel Salazar, Universidade de Porto, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal
| | - M A Tavares
- FMUP - Faculdade de Medicina, Universidade do Porto, Alameda Professor Hernâni Monteiro, 4200-319 Porto, Portugal
| | - P R R Monteiro
- ESTSP - Escola Superior de Tecnologia da Saúde do Porto, Instituto Politécnico do Porto, Rua Valente Perfeito, 322, 4400-330 Vila Nova de Gaia, Portugal
| | - T Summavielle
- IBMC - Instituto de Biologia Molecular e Celular, Universidade do Porto, Rua do Campo Alegre, 823, 4150-180 Porto, Portugal; ESTSP - Escola Superior de Tecnologia da Saúde do Porto, Instituto Politécnico do Porto, Rua Valente Perfeito, 322, 4400-330 Vila Nova de Gaia, Portugal.
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Calipari ES, Sun H, Eldeeb K, Luessen DJ, Feng X, Howlett AC, Jones SR, Chen R. Amphetamine self-administration attenuates dopamine D2 autoreceptor function. Neuropsychopharmacology 2014; 39:1833-42. [PMID: 24513972 PMCID: PMC4059891 DOI: 10.1038/npp.2014.30] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2013] [Revised: 01/17/2014] [Accepted: 02/03/2014] [Indexed: 12/27/2022]
Abstract
Dopamine D2 autoreceptors located on the midbrain dopaminergic neurons modulate dopamine (DA) neuron firing, DA release, and DA synthesis through a negative-feedback mechanism. Dysfunctional D2 autoreceptors following repeated drug exposure could lead to aberrant DA activity in the ventral tegmental area (VTA) and projection areas such as nucleus accumbens (NAcc), promoting drug-seeking and -taking behavior. Therefore, it is important to understand molecular mechanisms underlying drug-induced changes in D2 autoreceptors. Here, we reported that 5 days of amphetamine (AMPH) self-administration reduced the ability of D2 autoreceptors to inhibit DA release in the NAcc as determined by voltammetry. Using the antibody-capture [(35)S]GTPγS scintillation proximity assay, we demonstrated for the first time that midbrain D2/D3 receptors were preferentially coupled to Gαi2, whereas striatal D2/D3 receptors were coupled equally to Gαi2 and Gαo for signaling. Importantly, AMPH abolished the interaction between Gαi2 and D2/D3 receptors in the midbrain while leaving striatal D2/D3 receptors unchanged. The disruption of the coupling between D2/D3 receptors and Gαi2 by AMPH is at least partially explained by the enhanced RGS2 (regulator of G-protein signaling 2) activity resulting from an increased RGS2 trafficking to the membrane. AMPH had no effects on the midbrain expression and trafficking of other RGS proteins such as RGS4 and RGS8. Our data suggest that midbrain D2/D3 receptors are more susceptible to AMPH-induced alterations. Reduced D2 autoreceptor function could lead to enhanced DA signaling and ultimately addiction-related behavior. RGS2 may be a potential non-dopaminergic target for pharmacological intervention of dysfunctional DA transmission and drug addiction.
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Affiliation(s)
- Erin S Calipari
- Department of Physiology and Pharmacology, Wake Forest University School of Medicine, Winston Salem, NC, USA
| | - Haiguo Sun
- Department of Physiology and Pharmacology, Wake Forest University School of Medicine, Winston Salem, NC, USA
| | - Khalil Eldeeb
- Department of Physiology and Pharmacology, Wake Forest University School of Medicine, Winston Salem, NC, USA
| | - Deborah J Luessen
- Department of Physiology and Pharmacology, Wake Forest University School of Medicine, Winston Salem, NC, USA
| | - Xin Feng
- Department of Otolaryngology, Wake Forest University School of Medicine, Winston Salem, NC, USA
| | - Allyn C Howlett
- Department of Physiology and Pharmacology, Wake Forest University School of Medicine, Winston Salem, NC, USA,The Center for Neurobiology of Addiction Treatment, Wake Forest University School of Medicine, Winston Salem, NC, USA
| | - Sara R Jones
- Department of Physiology and Pharmacology, Wake Forest University School of Medicine, Winston Salem, NC, USA,The Center for Neurobiology of Addiction Treatment, Wake Forest University School of Medicine, Winston Salem, NC, USA
| | - Rong Chen
- Department of Physiology and Pharmacology, Wake Forest University School of Medicine, Winston Salem, NC, USA,The Center for Neurobiology of Addiction Treatment, Wake Forest University School of Medicine, Winston Salem, NC, USA,Department of Physiology and Pharmacology, Wake Forest University School of Medicine, Medical Center Boulevard, Winston Salem, NC 27157, USA, Tel: +336 716 8605, Fax: +336 713 1545, E-mail:
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13
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Evaluation of inhibitory effect of recreational drugs on dopaminergic terminal neuron by PET and whole-body autoradiography. BIOMED RESEARCH INTERNATIONAL 2014; 2014:157923. [PMID: 24877059 PMCID: PMC4022164 DOI: 10.1155/2014/157923] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Accepted: 03/27/2014] [Indexed: 01/23/2023]
Abstract
There is little investigation for the functional roles of peripheral dopamine. [18F]FDOPA has been used in cancer imaging (i.e., neuroendocrine and tumors pancreatic tumors) and neuroimaging (i.e., Parkinson's disease and Huntington's disease). Here, we accessed side effects of recreational drugs such as ketamine, cocaine, and methamphetamine on dopamine neurons in peripheral organs by using positron emission tomography (PET) imaging and quantitative whole-body autoradiography (QWBAR) with [18F]FDOPA. The images were applied for the measurement of specific binding ratios (SBRs) of striatum with the cerebellum as the reference region. Clear striatal [18F]FDOPA-derived radioactivity was observed. Moderate level of radiotracer accumulation was presented in the mucosal layers of the stomach and small intestine. The medulla layers of kidney had higher radioactivity than that of the cortex. Blocking images markedly eliminated the specific binding of [18F]FDOPA in the striatum and in peripheral organs such as stomachs, intestines, and kidney. Ketamine showed the highest inhibitory effect on striatal [18F]FDOPA-derived radioactivity followed by cocaine and methamphetamine. The current results demonstrated a useful crossing-validating tool that enhances the capability of [18F]FDOPA for further investigations of the alteration of dopaminergic neurons in the brain disorder or cancer diseases in peripheral tissues.
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Appel L, Bergström M, Buus Lassen J, Långström B. Tesofensine, a novel triple monoamine re-uptake inhibitor with anti-obesity effects: dopamine transporter occupancy as measured by PET. Eur Neuropsychopharmacol 2014; 24:251-61. [PMID: 24239329 DOI: 10.1016/j.euroneuro.2013.10.007] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Revised: 09/30/2013] [Accepted: 10/12/2013] [Indexed: 11/29/2022]
Abstract
Tesofensine (TE) is a novel triple monoamine re-uptake inhibitor inducing a potent inhibition of the re-uptake process in the synaptic cleft of the neurotransmitters dopamine, norepinephrine, and serotonin. In recent preclinical and clinical evaluations TE showed a robust anti-obesity effect, but the specific mechanism of this triple monoamine re-uptake inhibitor still needs to be further elucidated. This positron emission tomography (PET) study, using [¹¹C]βCIT-FE, aimed to assess the degree of the dopamine transporter (DAT) occupancy, at constant TE plasma levels, following different oral, multiple doses of TE during totally 8-12 days. In addition, the relationships between DAT occupancy and TE plasma concentrations, or doses, were investigated to enable assessment of DAT occupancies in subsequent clinical trials. The results demonstrated that TE induced a dose-dependent blockade of DAT following multiple doses of 0.125-1 mg TE at anticipated steady-state conditions. The mean striatal DAT occupancy varied dose-dependently between 18% and 77%. A sigmoid E(max) model well described the relationship between striatal DAT occupancy and TE plasma concentrations or doses. It was estimated that the maximum achievable DAT occupancy was about 80% and that half of this effect was accomplished by approximately 0.25 mg TE and a plasma drug concentration of 4 ng/ml. The results indicated an important mechanism of action of TE on DAT. Further, these results suggest that the previously reported dose-dependent weight loss, in TE treated subjects, was in part mediated by an up-regulation of dopaminergic pathways due to enhanced amounts of synaptic dopamine after blockade of DAT.
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Affiliation(s)
- Lieuwe Appel
- PET Centre, Department of Medical Imaging, Uppsala University Hospital, S-751 85 Uppsala, Sweden; Section of Nuclear Medicine and PET, Department of Radiology, Oncology, and Radiation Sciences, Uppsala University, Uppsala, Sweden.
| | - Mats Bergström
- Department of Pharmaceutical Sciences, Uppsala University, Uppsala, Sweden
| | | | - Bengt Långström
- Department of Biochemistry and Organic Chemistry, Uppsala University, Uppsala, Sweden; Department of Nuclear Medicine, PET & Cyclotron Unit, Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
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15
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Lawhorn C, Edusei E, Zhou Y, Ho A, Kreek MJ. Acute binge pattern cocaine administration induces region-specific effects in D1-r- and D2-r-expressing cells in eGFP transgenic mice. Neuroscience 2013; 253:123-31. [PMID: 24001687 DOI: 10.1016/j.neuroscience.2013.08.032] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2013] [Revised: 07/22/2013] [Accepted: 08/20/2013] [Indexed: 10/26/2022]
Abstract
Cocaine addiction is driven by genetic, neurologic and environmental components. The D1-like (D1 and D5) and D2-like (D2, D3 and D4) families of dopamine receptors play an important role in modulating the effects of cocaine administration on drug-seeking behavior. The advent of bacterial artificial chromosome-eGFP (enhanced green fluorescent protein) transgenic mice that express eGFP driven by the endogenous D1-receptor (D1-r) or D2-receptor (D2-r) promoters provides a unique opportunity to distinguish between these subpopulations of cells. In an effort to identify cocaine-induced alterations in D1-r- versus D2-r-expressing cells during the initial stages of addiction, we examined cells that expressed D1-rs in Drd1-eGFP mice, or D2-rs in Drd2-eGFP mice, after an acute, 1-day binge pattern of cocaine administration. We used multiphoton confocal microscopy and Visiopharm© software, to conduct unbiased stereological counts of D1-r-labeled or D2-r-labeled cells in various striatal regions. Mice were sacrificed at 30 min and 24-h post cocaine or saline administration. Compared to saline controls, Drd1-eGFP mice that received cocaine had a higher count of D1-r-labeled cells in the dorsolateral (DL) striatum, at the 30-min and 24-h time-points. No changes in the nucleus accumbens (NAc) core or shell were observed in Drd1-eGFP mice. Drd2-eGFP mice that received cocaine had fewer D2-r-labeled cells in the DL striatum and NAc core compared to saline controls. This effect was observed at the 30-min time-point but not at 24h. Drd2-eGFP mice that received cocaine also had fewer numbers of D2-r-labeled cells in the NAc core compared to saline controls, but no significant differences in the number of D2-r-labeled cells in the NAc shell. These results suggest that acute binge pattern cocaine administration may induce region-specific alterations in D1-r or D2-receptor gene expression, and may help elucidate the differential role of dopamine receptors in the initial stages of the addiction cycle.
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Affiliation(s)
- C Lawhorn
- The Rockefeller University, The Laboratory of the Biology of Addictive Diseases, 1230 York Avenue, New York, NY 10065, United States.
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16
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Fragou D, Zanos P, Kouidou S, Njau S, Kitchen I, Bailey A, Kovatsi L. Effect of chronic heroin and cocaine administration on global DNA methylation in brain and liver. Toxicol Lett 2013; 218:260-5. [DOI: 10.1016/j.toxlet.2013.01.022] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Revised: 01/22/2013] [Accepted: 01/25/2013] [Indexed: 12/11/2022]
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17
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Kreek MJ, Levran O, Reed B, Schlussman SD, Zhou Y, Butelman ER. Opiate addiction and cocaine addiction: underlying molecular neurobiology and genetics. J Clin Invest 2012; 122:3387-93. [PMID: 23023708 DOI: 10.1172/jci60390] [Citation(s) in RCA: 142] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Addictive diseases, including addiction to heroin, prescription opioids, or cocaine, pose massive personal and public health costs. Addictions are chronic relapsing diseases of the brain caused by drug-induced direct effects and persisting neuroadaptations at the epigenetic, mRNA, neuropeptide, neurotransmitter, or protein levels. These neuroadaptations, which can be specific to drug type, and their resultant behaviors are modified by various internal and external environmental factors, including stress responsivity, addict mindset, and social setting. Specific gene variants, including variants encoding pharmacological target proteins or genes mediating neuroadaptations, also modify vulnerability at particular stages of addiction. Greater understanding of these interacting factors through laboratory-based and translational studies have the potential to optimize early interventions for the therapy of chronic addictive diseases and to reduce the burden of relapse. Here, we review the molecular neurobiology and genetics of opiate addiction, including heroin and prescription opioids, and cocaine addiction.
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Affiliation(s)
- Mary Jeanne Kreek
- Laboratory of the Biology of Addictive Diseases, The Rockefeller University, New York, New York 10065, USA.
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18
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Butelman ER, Yuferov V, Kreek MJ. κ-opioid receptor/dynorphin system: genetic and pharmacotherapeutic implications for addiction. Trends Neurosci 2012; 35:587-96. [PMID: 22709632 DOI: 10.1016/j.tins.2012.05.005] [Citation(s) in RCA: 140] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2011] [Revised: 04/27/2012] [Accepted: 05/17/2012] [Indexed: 11/17/2022]
Abstract
Addictions to cocaine or heroin/prescription opioids [short-acting μ-opioid receptor (MOPr) agonists] involve relapsing cycles, with experimentation/escalating use, withdrawal/abstinence, and relapse/re-escalation. κ-Opioid receptors (KOPr; encoded by OPRK1), and their endogenous agonists, the dynorphins (encoded by PDYN), have counter-modulatory effects on reward caused by cocaine or MOPr agonist exposure, and exhibit plasticity in addictive-like states. KOPr/dynorphin activation is implicated in depression/anxiety, often comorbid with addictions. In this opinion article we propose that particular stages of the addiction cycle are differentially affected by KOPr/dynorphin systems. Vulnerability and resilience can be due to pre-existing (e.g., genetic) factors, or epigenetic modifications of the OPRK1 or PDYN genes during the addiction cycle. Pharmacotherapeutic approaches limiting changes in KOPr/dynorphin tone, especially with KOPr partial agonists, may hold potential for the treatment of specific drug addictions and psychiatric comorbidity.
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MESH Headings
- Adaptation, Biological/genetics
- Adaptation, Biological/physiology
- Animals
- Behavior, Addictive/drug therapy
- Behavior, Addictive/genetics
- Behavior, Addictive/physiopathology
- Disease Models, Animal
- Drug Discovery/methods
- Dynorphins/physiology
- Enkephalins/genetics
- Genetic Predisposition to Disease/genetics
- Humans
- Illicit Drugs/pharmacology
- Narcotic Antagonists/pharmacology
- Narcotic Antagonists/therapeutic use
- Polymorphism, Genetic
- Protein Precursors/genetics
- Receptors, Opioid, kappa/agonists
- Receptors, Opioid, kappa/antagonists & inhibitors
- Receptors, Opioid, kappa/physiology
- Recurrence
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Affiliation(s)
- Eduardo R Butelman
- Laboratory of the Biology of Addictive Diseases, The Rockefeller University, 1230 York Avenue, New York, NY 10065, USA
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19
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Hoffmann HM, Nadal R, Vignes M, Ortiz J. Chronic cocaine self-administration modulates ERK1/2 and CREB responses to dopamine receptor agonists in striatal slices. Addict Biol 2012; 17:565-75. [PMID: 21812869 DOI: 10.1111/j.1369-1600.2011.00353.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Cocaine abuse leads to adaptations in brain reward circuits, where dopaminergic neurotransmission is a fundamental component. We hypothesized that chronic cocaine self-administration could influence dopamine D1 and D2 receptor activation of extracellular signal-regulated protein kinase 1 and 2 (ERK1/2) and cyclic adenosine monophosphate response element-binding protein (CREB) phosphorylation. Male Sprague Dawley rats were exposed to cocaine self-administration for 6-11 weeks. Brains from sham controls and cocaine rats were extracted 1 day after the last session, and slices obtained from the striatum and nucleus accumbens (NAc) were incubated in vitro with or without the D1R agonist SKF38393 or the D2R agonist quinpirole. We found that cocaine self-administration led to a reduction in the capacity of D1R to activate ERK1/2 phosphorylation as compared with control rats. Cocaine self-administration also reduced D1R agonist-induced CREB phosphorylation in striatal slices, suggesting a downregulation of D1R signaling. D2R-induced ERK1/2 phosphorylation appeared blunted in striatal slices from cocaine rats. In contrast, surprisingly, cocaine self-administration strongly potentiated D2R agonist-induced CREB phosphorylation selectively in the NAc portion of the slices. Altered agonist-induced signaling was independent of total ERK1/2 and CREB expression. Our finding that selected cellular D2R responses to CREB were strengthened by cocaine self-administration could be relevant to understand how dopaminergic receptors participate in cocaine-induced behaviors.
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Affiliation(s)
- Hanne M Hoffmann
- Neuroscience Institute, Department of Biochemistry and Molecular Biology, School of Medicine, Universitat Autònoma de Barcelona, Spain
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20
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Leri F, Zhou Y, Carmichael B, Cummins E, Kreek MJ. Treatment-like steady-state methadone in rats interferes with incubation of cocaine sensitization and associated alterations in gene expression. Eur Neuropsychopharmacol 2012; 22:143-52. [PMID: 21745729 PMCID: PMC3810140 DOI: 10.1016/j.euroneuro.2011.06.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Revised: 05/12/2011] [Accepted: 06/14/2011] [Indexed: 01/11/2023]
Abstract
In a previous study, steady-state methadone treatment was found to prevent associative cocaine learning, as well as related decreases in mRNA expression of preprohypocretin/preproorexin (ppHcrt) in the lateral hypothalamus (LH) and dopamine D2 receptor (DR2) in the caudate-putamen (CP), and increases in mu-opioid receptor in the ventral striatum of rats. To investigate whether the same regimen of methadone exposure could prevent the incubation of cocaine sensitization and related alterations in gene expression, male Sprague-Dawley rats received 45 mg/kg/day steady-dose "binge" cocaine administration (IP) for 14 days followed by mini-pumps releasing 30 mg/kg/day methadone (SC). After 14 days of methadone, and a subsequent 10-day drug-free period, all rats were tested for sensitization (cocaine test dose: 15 mg/kg) and brain tissue was collected to quantify mRNA expression. Rats exposed to cocaine displayed cocaine-induced stereotypy at test, as well as enhanced ppHcrt mRNA in the LH and reduced DR2 mRNA in the CP. Importantly, these alterations were significantly reduced in rats treated with methadone following cocaine. These results suggest that steady-state methadone can interfere with the incubation of neuroadaptations underlying changes in behavioral responses to cocaine and cocaine-associated stimuli, and that these effects can be observed even after withdrawal from methadone.
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Nikolaus S, Larisch R, Vosberg H, Beu M, Wirrwar A, Antke C, Kley K, Silva MADS, Huston JP, Müller HW. Pharmacological challenge and synaptic response - assessing dopaminergic function in the rat striatum with small animal single-photon emission computed tomography (SPECT) and positron emission tomography (PET). Rev Neurosci 2011; 22:625-45. [PMID: 22103308 DOI: 10.1515/rns.2011.054] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Disturbances of dopaminergic neurotransmission may be caused by changes in concentrations of synaptic dopamine (DA) and/or availabilities of pre- and post-synaptic transporter and receptor binding sites. We present a series of experiments which focus on the regulatory mechanisms of the dopamin(DA)ergic synapse in the rat striatum. In these studies, DA transporter (DAT) and/or D(2) receptor binding were assessed with either small animal single-photon emission computed tomography (SPECT) or positron emission tomography (PET) after pharmacological challenge with haloperidol, L-DOPA and methylphenidate, and after nigrostriatal 6-hydroxydopamine lesion. Investigations of DAT binding were performed with [(123)I]N-ω-fluoropropyl-2β-carbomethoxy-3β-(4-iodophenyl)nortropane ([(123)I]FP-CIT). D(2) receptor bindingd was assessed with either [(123)I](S)-2-hydroxy-3-iodo-6-methoxy-N-[(1-ethyl-2-pyrrolidinyl)methyl]benzamide ([(123)I]IBZM) or [(18)F]1[3-(4'fluorobenzoyl)propyl]-4-(2-keto-3-methyl-1-benzimidazolinyl)piperidine ([(18)F]FMB). Findings demonstrate that in vivo investigations of transporter and/or receptor binding are feasible with small animal SPECT and PET. Therefore, tracers that are radiolabeled with isotopes of comparatively long half-lives such as (123)I may be employed. Our approach to quantify DAT and/or D(2) receptor binding at baseline and after pharmacological interventions inducing DAT blockade, D(2) receptor blockade, and increases or decreases of endogenous DA concentrations holds promise for the in vivo assessment of synaptic function. This pertains to animal models of diseases associated with pre- or postsynaptic DAergic deficiencies such as Parkinson's disease, Huntington's disease, attention-deficit/hyperactivity disorder, schizophrenia or drug abuse.
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Affiliation(s)
- Susanne Nikolaus
- Clinic of Nuclear Medicine, University Hospital Düsseldorf, Moorenstr. 5, D-40225 Düsseldorf, Germany
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22
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Collins GT, Truong YNT, Levant B, Chen J, Wang S, Woods JH. Behavioral sensitization to cocaine in rats: evidence for temporal differences in dopamine D3 and D2 receptor sensitivity. Psychopharmacology (Berl) 2011; 215:609-20. [PMID: 21207013 PMCID: PMC3102773 DOI: 10.1007/s00213-010-2154-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2010] [Accepted: 12/15/2010] [Indexed: 11/27/2022]
Abstract
RATIONALE Cocaine-induced changes in D(2) receptors have been implicated in the expression of sensitized behavioral responses and addiction-like behaviors; however, the influence of D(3) receptors is less clear. OBJECTIVES To characterize the effects of repeated cocaine administration on the sensitivity of rats to D(2)- and D(3)-mediated behaviors, as well as the binding properties of ventral striatal D(2)-like and D(3) receptors. METHODS Pramipexole was used to assess the sensitivity of rats to D(3)/D(2) agonist-induced yawning, hypothermia, and locomotor activity, 24 h, 72 h, 10, 21, and 42 days after repeated cocaine or saline administration. The locomotor effects of cocaine (42 day) and the binding properties of ventral striatal D(2)-like and D(3) receptors (24 h and 42 days) were also evaluated. RESULTS Cocaine-treated rats displayed an enhanced locomotor response to cocaine, as well as a progressive and persistent leftward/upward shift of the ascending limb (72 h-42 day) and leftward shift of the descending limb (42 days) of the pramipexole-induced yawning dose-response curve. Cocaine treatment also decreased B (max) and K (d) for D(2)-like receptors and increased D(3) receptor binding at 42 days. Cocaine treatment did not change pramipexole-induced hypothermia or locomotor activity or yawning induced by cholinergic or serotonergic agonists. CONCLUSIONS These studies suggest that temporal differences exist in the development of cocaine-induced sensitization of D(3) and D(2) receptors, with enhancements of D(3)-mediated behavioral effects observed within 72 h and enhancements of D(2)-mediated behavioral effects apparent 42 days after cocaine. These findings highlight the need to consider changes in D(3) receptor function when thinking about the behavioral plasticity that occurs during abstinence from cocaine use.
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Affiliation(s)
- Gregory T. Collins
- Department of Pharmacology, 1301 MSRB III, 1150 W. Medical Center Drive, University of Michigan Medical School, Ann Arbor, MI 48109-0632, USA
| | - Yen Nhu-Thi Truong
- Department of Pharmacology, 1301 MSRB III, 1150 W. Medical Center Drive, University of Michigan Medical School, Ann Arbor, MI 48109-0632, USA
| | - Beth Levant
- Department of Pharmacology, Toxicology, and Therapeutics, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Jianyong Chen
- Departments of Internal Medicine and Medicinal Chemistry, University of Michigan Medical School, Ann Arbor, MI 48109-0934, USA
| | - Shaomeng Wang
- Department of Pharmacology, 1301 MSRB III, 1150 W. Medical Center Drive, University of Michigan Medical School, Ann Arbor, MI 48109-0632, USA. Departments of Internal Medicine and Medicinal Chemistry, University of Michigan Medical School, Ann Arbor, MI 48109-0934, USA
| | - James H. Woods
- Department of Pharmacology, 1301 MSRB III, 1150 W. Medical Center Drive, University of Michigan Medical School, Ann Arbor, MI 48109-0632, USA
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23
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Cumming P. Absolute abundances and affinity states of dopamine receptors in mammalian brain: A review. Synapse 2011; 65:892-909. [DOI: 10.1002/syn.20916] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2010] [Accepted: 01/14/2011] [Indexed: 12/14/2022]
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Yuferov V, Levran O, Proudnikov D, Nielsen DA, Kreek MJ. Search for genetic markers and functional variants involved in the development of opiate and cocaine addiction and treatment. Ann N Y Acad Sci 2010; 1187:184-207. [PMID: 20201854 DOI: 10.1111/j.1749-6632.2009.05275.x] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Addiction to opiates and illicit use of psychostimulants is a chronic, relapsing brain disease that, if left untreated, can cause major medical, social, and economic problems. This article reviews recent progress in studies of association of gene variants with vulnerability to develop opiate and cocaine addictions, focusing primarily on genes of the opioid and monoaminergic systems. In addition, we provide the first evidence of a cis-acting polymorphism and a functional haplotype in the PDYN gene, of significantly higher DNA methylation rate of the OPRM1 gene in the lymphocytes of heroin addicts, and significant differences in genotype frequencies of three single-nucleotide polymorphisms of the P-glycoprotein gene (ABCB1) between "higher" and "lower" methadone doses in methadone-maintained patients. In genomewide and multigene association studies, we found association of several new genes and new variants of known genes with heroin addiction. Finally, we describe the development and application of a novel technique: molecular haplotyping for studies in genetics of drug addiction.
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Affiliation(s)
- Vadim Yuferov
- Laboratory of the Biology of Addictive Diseases, Rockefeller University, New York, New York 10065, USA
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25
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Sun WL, Zhou L, Quinones-Jenab V, Jenab S. Cocaine effects on dopamine and NMDA receptors interactions in the striatum of Fischer rats. Brain Res Bull 2009; 80:377-81. [PMID: 19716863 DOI: 10.1016/j.brainresbull.2009.08.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2009] [Revised: 07/31/2009] [Accepted: 08/20/2009] [Indexed: 11/20/2022]
Abstract
Numerous studies have shown that biochemical and behavioral effects of cocaine are mediated by dopamine D1 receptor (D1R) and NMDA R1 receptor (NR1)-mediated transmission. In this study, we investigated the physical interactions between D1R and NR1 in response to acute cocaine administration in a time course of 5-60 min. In the caudate-putamen (CPu) of male Fischer rats, a single cocaine injection (30 mg/kg) reduced D1R-NR1 protein-protein interactions 30 min after treatment. In addition, activation or blockade of the NMDA receptor using NMDA (25mg/kg) or MK-801 (0.25mg/kg), respectively, also reduced the D1R-NR1 physical interactions. Acute cocaine administration did not alter total D1R or NR1 protein levels in our time course of study. These results indicate that D1R-NR1 physical interaction rather than total protein levels may regulate the intracellular signaling after acute cocaine administration.
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Affiliation(s)
- Wei-Lun Sun
- Department of Psychology, Hunter College, CUNY, 695 Park Ave., New York, NY 10065, USA.
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26
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Yakushev IY, Dupont E, Buchholz HG, Tillmanns J, Debus F, Cumming P, Heimann A, Fellgiebel A, Luhmann HJ, Landvogt C, Werhahn KJ, Schreckenberger M, Potschka H, Bartenstein P. In vivo imaging of dopamine receptors in a model of temporal lobe epilepsy. Epilepsia 2009; 51:415-22. [PMID: 19694792 DOI: 10.1111/j.1528-1167.2009.02272.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
PURPOSE Alterations in dopamine neurotransmission in animal models of epilepsies have been frequently demonstrated using invasive neuroscience or ex vivo techniques. We aimed to test whether corresponding alterations could be detected by noninvasive in vivo brain imaging with positron emission tomography (PET) in the chronic phase of the rat pilocarpine model of temporal lobe epilepsy. METHODS Six pilocarpine-treated Wistar rats exhibiting spontaneous recurrent seizures and nine control rats were studied with PET using [(18)F]-fallypride, a high-affinity dopamine D(2/3) receptor ligand. Parametric images of [(18)F]-fallypride specific binding were calculated using a reference tissue method, and the two groups were contrasted by whole-brain voxel-based analysis implemented in statistical parametric mapping (SPM5). RESULTS Dopamine D(2/3) receptor availability was 27% lower in the bilateral anterior caudate-putamen of pilocarpine-treated rats as compared to controls (p < 0.05), but binding was unaffected in other striatal or extrastriatal regions. CONCLUSIONS The finding of substantially reduced availability of dopamine D(2/3) receptors in the anterior caudate-putamen of rats during the chronic phase of the pilocarpine model is in agreement with results of invasive (microinjection, microdialysis) animal studies that have revealed increased dopamine tonus and a D(2/3) receptor-mediated anticonvulsant action of dopamine in the anterior segment of the rat striatum. The present PET approach could be prospectively applied for monitoring dopamine receptor changes longitudinally, that is, at different phases of the epileptogenic process, and opens perspectives for testing dopaminergic agents as potential antiepileptogenic drugs.
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Affiliation(s)
- Igor Y Yakushev
- Department of Nuclear Medicine, University of Mainz, Mainz, Germany.
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Martinez D, Slifstein M, Narendran R, Foltin RW, Broft A, Hwang DR, Perez A, Abi-Dargham A, Fischman MW, Kleber HD, Laruelle M. Dopamine D1 receptors in cocaine dependence measured with PET and the choice to self-administer cocaine. Neuropsychopharmacology 2009; 34:1774-82. [PMID: 19177067 PMCID: PMC2680918 DOI: 10.1038/npp.2008.235] [Citation(s) in RCA: 118] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The goal of this study was to determine D(1) receptor availability in human cocaine-dependent (CD) subjects and matched healthy controls (HCs). In addition, the CD subjects performed cocaine self-administration sessions in order to explore the association between D(1) receptor availability and cocaine-seeking behavior. Twenty-five CD subjects (40+/-4 years, 19M/6 F) and 23 matched HCs (38+/-4 years, 19M/4F) were scanned with PET and the radiotracer [(11)C]NNC 112. During the cocaine self-administration sessions, CD volunteers were given the choice to self-administer cocaine (0, 6, and 12 mg) or to receive a monetary voucher worth $5. D(1) receptor availability was measured in the limbic, associative, and sensori-motor striatum in addition to cortical brain regions. No difference in D(1) receptor availability was seen between the two groups. A negative association was seen between D(1) receptor BP(ND) in the limbic striatum and the choice for the 6 mg dose of cocaine (r=-0.47, p=0.02, corrected for age). These results do not support the hypothesis that cocaine dependence is associated with a reduction in D(1) receptor availability in the striatum. However, within the CD subjects, low D(1) receptor availability in the ventral striatum was associated with the choice to self-administer cocaine, suggesting that low D(1) receptor availability may be associated with an increased risk of relapse in cocaine dependence.
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Affiliation(s)
- Diana Martinez
- Department of Psychiatry, Columbia University College of Physicians and Surgeons, New York, NY
| | - Mark Slifstein
- Department of Psychiatry, Columbia University College of Physicians and Surgeons, New York, NY
| | - Rajesh Narendran
- Department of Psychiatry, Columbia University College of Physicians and Surgeons, New York, NY
| | - Richard W Foltin
- Department of Psychiatry, Columbia University College of Physicians and Surgeons, New York, NY
| | - Allegra Broft
- Department of Psychiatry, Columbia University College of Physicians and Surgeons, New York, NY
| | - Dah-Ren Hwang
- Department of Psychiatry, Columbia University College of Physicians and Surgeons, New York, NY
| | - Audrey Perez
- Department of Psychiatry, Columbia University College of Physicians and Surgeons, New York, NY
| | - Anissa Abi-Dargham
- Department of Psychiatry, Columbia University College of Physicians and Surgeons, New York, NY
| | - Marian W Fischman
- Department of Psychiatry, Columbia University College of Physicians and Surgeons, New York, NY
| | - Herbert D Kleber
- Department of Psychiatry, Columbia University College of Physicians and Surgeons, New York, NY
| | - Marc Laruelle
- Department of Psychiatry, Columbia University College of Physicians and Surgeons, New York, NY,Department of Radiology, Columbia University College of Physicians and Surgeons, New York, NY
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Narendran R, Martinez D. Cocaine abuse and sensitization of striatal dopamine transmission: a critical review of the preclinical and clinical imaging literature. Synapse 2009; 62:851-69. [PMID: 18720516 DOI: 10.1002/syn.20566] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Much effort has been devoted in the preclinical addiction literature to understanding the phenomenon of sensitization, an enhanced dopaminergic response in the nucleus accumbens that occurs after repeated exposure to psychostimulant drugs. Although sensitization has been reported in preclinical studies, studies of sensitization in humans measuring behavioral and physiological responses have been mixed and inconclusive. However, imaging studies with positron emission tomography (PET) and single photon emission computed tomography (SPECT) using a stimulant challenge to induce dopamine (DA) release provide a unique opportunity to probe DA transmission in cocaine dependent human subjects. In contrast to the basic science literature that predicted sensitization, three independent cohorts have shown a blunted DA response, or the opposite of sensitization, in human cocaine dependent subjects. This article reviews the methodological differences between the preclinical and clinical PET studies that have investigated DA sensitization in order to address the discrepancy between the human and animal literature.
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Affiliation(s)
- Rajesh Narendran
- Department of Radiology, University of Pittsburgh, Pittsburgh, Pennsylvania 15232, USA.
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Abstract
Drug dependence is a chronic, relapsing disorder in which compulsive drug-seeking and drug-taking behaviours persist despite serious negative consequences. Addictive substances, such as opioids, ethanol, psychostimulants and nicotine, induce pleasant states or relieve distress, effects that contribute to their recreational use. Dopamine is critically involved in drug addiction processes. However, the role of the various dopaminergic receptor subtypes has been difficult to delineate. Here, we will review the information collected implicating the receptors of the D1 family (DRD1 and DRD5) and of the D2 family (DRD2, DRD3 and DRD4) in drug addiction. We will summarize the distribution of these receptors in the brain, the preclinical experiments carried out with pharmacological and transgenic approaches and the genetic studies carried out linking genetic variants of these receptors to drug addiction phenotypes. A meta-analysis of the studies carried out evaluating DRD2 and alcohol dependence is also provided, which indicates a significant association. Overall, this review indicates that different aspects of the addiction phenotype are critically influenced by dopaminergic receptors and that variants of those genes seem to influence some addiction phenotypes in humans.
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30
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Oosterhuis BE, LaForge KS, Proudnikov D, Ho A, Nielsen DA, Gianotti R, Barral S, Gordon D, Leal SM, Ott J, Kreek MJ. Catechol-O-methyltransferase (COMT) gene variants: possible association of the Val158Met variant with opiate addiction in Hispanic women. Am J Med Genet B Neuropsychiatr Genet 2008; 147B:793-8. [PMID: 18270997 PMCID: PMC2909109 DOI: 10.1002/ajmg.b.30716] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Catechol-O-methyltransferase (COMT) catalyzes the breakdown of catechol neurotransmitters, including dopamine, which plays a prominent role in drug reward. A common single nucleotide polymorphism (SNP), G472A, codes for a Val158Met substitution and results in a fourfold down regulation of enzyme activity. We sequenced exon IV of COMT gene in search for novel polymorphisms and then genotyped four out of five identified by direct sequencing, using TaqMan assay on 266 opioid-dependent and 173 control subjects. Genotype frequencies of the G472A SNP varied significantly (P = 0.029) among the three main ethnic/cultural groups (Caucasians, Hispanics, and African Americans). Using a genotype test, we found a trend to point-wise association (P = 0.053) of the G472A SNP in Hispanic subjects with opiate addiction. Further analysis of G472A genotypes in Hispanic subjects with data stratified by gender identified a point-wise significant (P = 0.049) association of G/A and A/A genotypes with opiate addiction in women, but not men. These point-wise significant results are not significant experiment-wise (at P < 0.05) after correction for multiple testing. No significant association was found with haplotypes of the three most common SNPs. Linkage disequilibrium patterns were similar for the three ethnic/cultural groups.
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Affiliation(s)
- Bronson E. Oosterhuis
- Laboratory of the Biology of Addictive Diseases, The Rockefeller University, New York, New York
| | - K. Steven LaForge
- Laboratory of the Biology of Addictive Diseases, The Rockefeller University, New York, New York
| | - Dmitri Proudnikov
- Laboratory of the Biology of Addictive Diseases, The Rockefeller University, New York, New York
| | - Ann Ho
- Laboratory of the Biology of Addictive Diseases, The Rockefeller University, New York, New York
| | - David A. Nielsen
- Laboratory of the Biology of Addictive Diseases, The Rockefeller University, New York, New York
| | - Robert Gianotti
- Laboratory of the Biology of Addictive Diseases, The Rockefeller University, New York, New York
| | - Sandra Barral
- G.H. Sergievsky Center, Columbia University, New York, New York
| | - Derek Gordon
- Department of Genetics, Rutgers University, Piscataway, New Jersey
| | - Suzanne M. Leal
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, Laboratory of Statistical Genetics, The Rockefeller University, New York, New York
| | - Jurg Ott
- Laboratory of Statistical Genetics, The Rockefeller University, New York, New York, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China
| | - Mary Jeanne Kreek
- Laboratory of the Biology of Addictive Diseases, The Rockefeller University, New York, New York,Correspondence to: Mary Jeanne Kreek, M.D., Patrick E. and Beatrice M. Haggerty Professor, Head of Laboratory, Laboratory of the Biology of Addictive Diseases, Box 171, 1230 York Avenue, New York, NY 10021.
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Bailey A, Metaxas A, Yoo JH, McGee T, Kitchen I. Decrease of D2 receptor binding but increase in D2-stimulated G-protein activation, dopamine transporter binding and behavioural sensitization in brains of mice treated with a chronic escalating dose 'binge' cocaine administration paradigm. Eur J Neurosci 2008; 28:759-70. [PMID: 18671743 DOI: 10.1111/j.1460-9568.2008.06369.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Understanding the neurobiology of the transition from initial drug use to excessive drug use has been a challenge in drug addiction. We examined the effect of chronic 'binge' escalating dose cocaine administration, which mimics human compulsive drug use, on behavioural responses and the dopaminergic system of mice and compared it with a chronic steady dose (3 x 15 mg/kg/day) 'binge' cocaine administration paradigm. Male C57BL/6J mice were injected with saline or cocaine in an escalating dose paradigm for 14 days. Locomotor and stereotypy activity were measured and quantitative autoradiographic mapping of D(1) and D(2) receptors, dopamine transporters and D(2)-stimulated [(35)S]GTPgammaS binding was performed in the brains of mice treated with this escalating and steady dose paradigm. An initial sensitization to the locomotor effects of cocaine followed by a dose-dependent increase in the duration of the locomotor effect of cocaine was observed in the escalating but not the steady dose paradigm. Sensitization to the stereotypy effect of cocaine and an increase in cocaine-induced stereotypy score was observed from 3 x 20 to 3 x 25 mg/kg/day cocaine. There was a significant decrease in D(2) receptor density, but an increase in D(2)-stimulated G-protein activity and dopamine transporter density in the striatum of cocaine-treated mice, which was not observed in our steady dose paradigm. Our results document that chronic 'binge' escalating dose cocaine treatment triggers profound behavioural and neurochemical changes in the dopaminergic system, which might underlie the transition from drug use to compulsive drug use associated with addiction, which is a process of escalation.
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Affiliation(s)
- A Bailey
- Faculty of Health and Medical Sciences, AY Building, University of Surrey, Guildford, Surrey GU2 7XH, UK.
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32
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Dalley JW, Fryer TD, Aigbirhio FI, Brichard L, Richards HK, Hong YT, Baron JC, Everitt BJ, Robbins TW. Modelling human drug abuse and addiction with dedicated small animal positron emission tomography. Neuropharmacology 2008; 56 Suppl 1:9-17. [PMID: 18614184 DOI: 10.1016/j.neuropharm.2008.05.029] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2008] [Revised: 05/16/2008] [Accepted: 05/24/2008] [Indexed: 11/19/2022]
Abstract
Drug addiction is a chronically relapsing brain disorder, which causes substantial harm to the addicted individual and society as a whole. Despite considerable research we still do not understand why some people appear particularly disposed to drug abuse and addiction, nor do we understand how frequently co-morbid brain disorders such as depression and attention-deficit hyperactivity disorder (ADHD) contribute causally to the emergence of addiction-like behaviour. In recent years positron emission tomography (PET) has come of age as a translational neuroimaging technique in the study of drug addiction, ADHD and other psychopathological states in humans. PET provides unparalleled quantitative assessment of the spatial distribution of radiolabelled molecules in the brain and because it is non-invasive permits longitudinal assessment of physiological parameters such as binding potential in the same subject over extended periods of time. However, whilst there are a burgeoning number of human PET experiments in ADHD and drug addiction there is presently a paucity of PET imaging studies in animals despite enormous advances in our understanding of the neurobiology of these disorders based on sophisticated animal models. This article highlights recent examples of successful cross-species convergence of findings from PET studies in the context of drug addiction and ADHD and identifies how small animal PET can more effectively be used to model complex psychiatric disorders involving at their core impaired behavioural self-control.
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Affiliation(s)
- Jeffrey W Dalley
- Behavioural and Clinical Neuroscience Institute, University of Cambridge, Downing Street, Cambridge, CB2 3EB, UK.
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Sakiyama Y, Hatano K, Tajima T, Kato T, Kawasumi Y, Suzuki M, Ito K. An atlas-based image registration method for dopamine receptor imaging with PET in rats. Ann Nucl Med 2007; 21:455-62. [PMID: 17952554 DOI: 10.1007/s12149-007-0049-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2007] [Accepted: 06/11/2007] [Indexed: 10/22/2022]
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Hernández LF, Segovia G, Mora F. Chronic treatment with a dopamine uptake blocker changes dopamine and acetylcholine but not glutamate and GABA concentrations in prefrontal cortex, striatum and nucleus accumbens of the awake rat. Neurochem Int 2007; 52:457-69. [PMID: 17881090 DOI: 10.1016/j.neuint.2007.08.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2007] [Revised: 08/08/2007] [Accepted: 08/12/2007] [Indexed: 11/19/2022]
Abstract
The present study was aimed to investigate the effects of a chronic treatment with the dopamine uptake blocker nomifensine on the in vivo extracellular concentrations of dopamine, acetylcholine, glutamate and GABA in the prefrontal cortex, striatum and nucleus accumbens. Male Wistar rats received intraperitoneal (i.p.) daily injections of nomifensine (10 mg/kg) or saline for 22 days. Microdialysis experiments were performed on days 1, 8, 15 and 22 of treatment to evaluate the effects of the injection of nomifensine or saline. Motor activity of the animals was monitored during microdialysis experiments. Injections of nomifensine increased extracellular concentration of dopamine in striatum and nucleus accumbens, but not in prefrontal cortex. Acetylcholine concentrations in striatum but not in nucleus accumbens were increased by nomifensine on days 15 and 22 of treatment. In prefrontal cortex, nomifensine increased acetylcholine levels without differences among days. No changes were found on glutamate and GABA concentrations in the three areas studied. Injections of nomifensine also increased spontaneous motor activity and stereotyped behaviour without differences among days. These results show that systemic chronic treatment with a dopamine uptake blocker produces differential effects on extracellular concentrations of dopamine and acetylcholine, but not glutamate and GABA, in different areas of the brain.
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Affiliation(s)
- L F Hernández
- Department of Physiology, Faculty of Medicine, Universidad Complutense, Ciudad Universitaria s/n, 28040 Madrid, Spain
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35
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Kendirci M, Pradhan L, Trost L, Gur S, Chandra S, Agrawal KC, Hellstrom WJG. Peripheral Mechanisms of Erectile Dysfunction in a Rat Model of Chronic Cocaine Use. Eur Urol 2007; 52:555-63. [PMID: 17420087 DOI: 10.1016/j.eururo.2007.03.022] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2006] [Accepted: 03/09/2007] [Indexed: 11/16/2022]
Abstract
OBJECTIVE To evaluate the peripheral mechanisms of erectile dysfunction (ED) in a rat model of triple-binge cocaine administration. METHODS Adult male Sprague-Dawley rats (n=24) were divided into two groups: group 1, control rats receiving vehicle (saline); group 2, rats receiving binge cocaine injections. After completion of triple-binge cocaine or saline injections, both groups underwent an in vivo, neurogenic-mediated erectile response protocol to assess intracavernosal pressure (ICP). Penile endothelin-A and -B receptors (ET(A)R and ET(B)R), plasma levels of big endothelin-1 (big-ET-1), and endothelial nitric oxide synthase (eNOS) protein expression were assessed. To analyze nitric oxide (NO) production, we measured plasma nitrate-nitrite levels and quantitated myeloperoxidase (MPO) activity in cavernosal tissues to determine reactive oxygen species generation. Endothelium-dependent and -independent relaxation responses were evaluated in vitro. Data were analyzed with Student t test. RESULTS Triple-binge cocaine administration caused significantly decreased erectile responses as measured by ICP in vivo. Plasma big-ET-1 levels were significantly increased in the triple-binge cocaine treatment group compared with control animals. In the penis, triple-binge cocaine administration significantly increased ET(A)R expression compared with saline controls, while ET(B)R expression was not altered. Cocaine-treated rats had significantly decreased eNOS expression and NO production. The activity of tissue MPO was significantly increased in the cocaine group compared with control rats. Organ bath studies demonstrated that triple-binge cocaine resulted in a 64% reduction in maximal relaxation compared with the control group. CONCLUSION This study demonstrates that triple-binge cocaine administration significantly reduces erectile function in rats. The pathophysiologic mechanisms that are likely involved include increased plasma big-ET-1 levels, increased penile ET(A)R expression, increased penile MPO activity, and reduced penile eNOS expression.
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Affiliation(s)
- Muammer Kendirci
- Department of Urology, Tulane University School of Medicine, New Orleans, LA 70112, USA
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Bailey A, Yoo JH, Racz I, Zimmer A, Kitchen I. Preprodynorphin mediates locomotion and D2 dopamine and mu-opioid receptor changes induced by chronic 'binge' cocaine administration. J Neurochem 2007; 102:1817-1830. [PMID: 17532787 DOI: 10.1111/j.1471-4159.2007.04661.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Evidence suggests that the kappa-opioid receptor (KOP-r) system plays an important role in cocaine addiction. Indeed, cocaine induces endogenous KOP activity, which is a mechanism that opposes alterations in behaviour and brain function resulting from repeated cocaine use. In this study, we have examined the influence of deletion of preprodynorphin (ppDYN) on cocaine-induced behavioural effects and on hypothalamic-pituitary-adrenal axis activity. Furthermore, we have measured mu-opioid receptor (MOP-r) agonist-stimulated [(35)S]GTPgammaS, dopamine D(1), D(2) receptor and dopamine transporter (DAT) binding. Male wild-type (WT) and ppDYN knockout (KO) mice were injected with saline or cocaine (45 mg/kg/day) in a 'binge' administration paradigm for 14 days. Chronic cocaine produced an enhancement of locomotor sensitisation in KO. No genotype effect was found on stereotypy behaviour. Cocaine-enhanced MOP-r activation in WT but not in KO. There was an overall decrease in D(2) receptor binding in cocaine-treated KO but not in WT mice. No changes were observed in D(1) and DAT binding. Cocaine increased plasma corticosterone levels in WT but not in KO. The data confirms that the endogenous KOP system inhibits dopamine neurotransmission and that ppDYN may mediate the enhancement of MOP-r activity and the activation of the hypothalamic-pituitary-adrenal axis after chronic cocaine treatment.
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MESH Headings
- Analgesics, Opioid/metabolism
- Analgesics, Opioid/pharmacology
- Animals
- Binding, Competitive/drug effects
- Binding, Competitive/physiology
- Cocaine/adverse effects
- Cocaine-Related Disorders/genetics
- Cocaine-Related Disorders/metabolism
- Cocaine-Related Disorders/physiopathology
- Corticosterone/metabolism
- Dopamine Plasma Membrane Transport Proteins/drug effects
- Dopamine Plasma Membrane Transport Proteins/metabolism
- Dopamine Uptake Inhibitors/adverse effects
- Drug Administration Schedule
- Dynorphins/genetics
- Dynorphins/metabolism
- Guanosine 5'-O-(3-Thiotriphosphate)/metabolism
- Hypothalamo-Hypophyseal System/drug effects
- Hypothalamo-Hypophyseal System/metabolism
- Hypothalamo-Hypophyseal System/physiopathology
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Motor Activity/drug effects
- Motor Activity/physiology
- Pituitary-Adrenal System/drug effects
- Pituitary-Adrenal System/physiology
- Protein Precursors/genetics
- Protein Precursors/metabolism
- Receptors, Dopamine D1/drug effects
- Receptors, Dopamine D1/metabolism
- Receptors, Dopamine D2/drug effects
- Receptors, Dopamine D2/metabolism
- Receptors, Opioid, kappa/drug effects
- Receptors, Opioid, kappa/metabolism
- Receptors, Opioid, mu/drug effects
- Receptors, Opioid, mu/metabolism
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Affiliation(s)
- A Bailey
- School of Biomedical and Molecular Sciences, University of Surrey, Guildford, UKDepartment of Molecular Psychiatry, Life & Brain Center, University of Bonn, Bonn, Germany
| | - J H Yoo
- School of Biomedical and Molecular Sciences, University of Surrey, Guildford, UKDepartment of Molecular Psychiatry, Life & Brain Center, University of Bonn, Bonn, Germany
| | - I Racz
- School of Biomedical and Molecular Sciences, University of Surrey, Guildford, UKDepartment of Molecular Psychiatry, Life & Brain Center, University of Bonn, Bonn, Germany
| | - A Zimmer
- School of Biomedical and Molecular Sciences, University of Surrey, Guildford, UKDepartment of Molecular Psychiatry, Life & Brain Center, University of Bonn, Bonn, Germany
| | - I Kitchen
- School of Biomedical and Molecular Sciences, University of Surrey, Guildford, UKDepartment of Molecular Psychiatry, Life & Brain Center, University of Bonn, Bonn, Germany
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Graham DL, Hoppenot R, Hendryx A, Self DW. Differential ability of D1 and D2 dopamine receptor agonists to induce and modulate expression and reinstatement of cocaine place preference in rats. Psychopharmacology (Berl) 2007; 191:719-30. [PMID: 16835769 DOI: 10.1007/s00213-006-0473-5] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2005] [Accepted: 06/09/2006] [Indexed: 11/29/2022]
Abstract
RATIONALE D1-Like agonists are self-administered by drug-naive animals, whereas D2-like agonists reinstate cocaine-seeking behavior, but the rewarding and reinstating effects of D1- and D2-like agonists in pavlovian-based conditioned place preference are equivocal. OBJECTIVE To compare the ability of D1 and D2 agonists to produce conditioned place preference with their modulation of expression and reinstatement of an established cocaine place preference. METHODS Using an unbiased procedure, we measured the place preference induced by the D1 receptor agonist SKF 81297 and the D2/D3 receptor agonist quinpirole in drug-naive or cocaine-exposed rats. The rewarding effects of the D1 agonists SKF 82958, ABT-431, A-77636, and the D2/D3 receptor agonist 7-OH-DPAT were also tested. Additionally, we tested the ability of SKF 81297 and quinpirole to modulate expression and reinstatement of an established cocaine place preference. RESULTS The D1 receptor agonists SKF 81297, SKF 82958, and ABT-431 produced dose-dependent conditioned place preferences, whereas A-77636 produced only place aversion, and the D2/D3 agonists quinpirole and 7-OH-DPAT were without effect in drug naive rats. In cocaine-treated rats, SKF-81297-induced place preference was reduced, whereas quinpirole-induced place preference was revealed. Pretreatment using either D1 or D2/D3 agonists blocked expression of an established cocaine place preference, but only the D1 agonist SKF 81297 and cocaine dose-dependently reinstated an extinguished cocaine place preference, whereas the D2/D3 agonist quinpirole induced place aversion but failed to alter cocaine-induced reinstatement. CONCLUSIONS D1, but not D2/D3, agonists mediate rewarding effects and reinstatement of cocaine place preference, but the reinstating effects differ markedly from self-administration paradigms.
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MESH Headings
- Animals
- Behavior, Addictive/metabolism
- Behavior, Addictive/psychology
- Behavior, Animal/drug effects
- Central Nervous System Stimulants/administration & dosage
- Central Nervous System Stimulants/pharmacology
- Cocaine/administration & dosage
- Cocaine/pharmacology
- Cocaine-Related Disorders/metabolism
- Cocaine-Related Disorders/psychology
- Conditioning, Psychological/drug effects
- Dopamine Agonists/pharmacology
- Dose-Response Relationship, Drug
- Extinction, Psychological
- Male
- Motivation
- Motor Activity/drug effects
- Rats
- Rats, Sprague-Dawley
- Receptors, Dopamine D1/agonists
- Receptors, Dopamine D1/metabolism
- Receptors, Dopamine D2/agonists
- Receptors, Dopamine D2/metabolism
- Receptors, Dopamine D3/agonists
- Receptors, Dopamine D3/metabolism
- Reward
- Self Administration
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Affiliation(s)
- Danielle L Graham
- Department of Psychiatry, The Seay Center for Basic and Applied Research in Psychiatric Illness, The University of Texas Southwestern Medical Center, Dallas, TX 75390-9070, USA
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Nikolaus S, Larisch R, Beu M, Antke C, Kley K, Forutan F, Wirrwar A, Müller HW. Investigating the Dopaminergic Synapse In Vivo. II. Molecular Imaging Studies in Small Laboratory Animals. Rev Neurosci 2007; 18:473-504. [DOI: 10.1515/revneuro.2007.18.6.473] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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O'Connor KA, Gregg TC, Davies HML, Childers SR. Effects of long-term biogenic amine transporter blockade on receptor/G-protein coupling in rat brain. Neuropharmacology 2005; 48:62-71. [PMID: 15617728 DOI: 10.1016/j.neuropharm.2004.08.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2004] [Revised: 07/12/2004] [Accepted: 08/20/2004] [Indexed: 11/26/2022]
Abstract
This study examines the effect of long-term elevation of brain monoamine levels on receptor/G-protein coupling by chronic administration of a highly potent tropane analog, WF-23 (2beta-propanoyl-3beta-(2-naphthyl) tropane). WF-23 blocks dopamine, serotonin and norepinephrine transporters with high affinity in vitro, and blocks transporters for at least two days following a single in vivo administration. Rats were chronically treated for 15 days with 1mg/kg WF-23, injected i.p. every two days. Receptor activation of G-proteins was determined by [35S]GTPgammaS autoradiography in brain sections for D2, 5-HT1A and alpha2-adrenergic receptors, as well as mu opioid receptors as a non-monoamine receptor control. Chronic treatment with WF-23 produced significant reductions in D2, 5-HT1A, and alpha2-adrenergic receptor-stimulated [35S]GTPgammaS binding in caudate/putamen, hippocampus and amygdala, respectively. There were no effects of WF-23 treatment on mu opioid-stimulated [35S]GTPgammaS binding. Additionally, there was no effect of WF-23 treatment on D2 receptor binding, as determined by [3H]spiperone autoradiography. These data show that chronic blockade of monoamine transporters produces specific uncoupling of receptors and G-proteins in specific brain regions in the absence of receptor downregulation.
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Affiliation(s)
- Kerry Ann O'Connor
- Wake Forest University Health Sciences, Physiology and Pharmacology Department, Medical Center Boulevard, Winston-Salem, NC 27157, USA
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41
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Reid MS, Casadonte P, Baker S, Sanfilipo M, Braunstein D, Hitzemann R, Montgomery A, Majewska D, Robinson J, Rotrosen J. A placebo-controlled screening trial of olanzapine, valproate, and coenzyme Q10/L-carnitine for the treatment of cocaine dependence. Addiction 2005; 100 Suppl 1:43-57. [PMID: 15730349 DOI: 10.1111/j.1360-0443.2005.00990.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
AIMS To conduct a medication screening trial on the efficacy of olanzapine, valproate or coenzyme Q10/L-carnitine combination versus placebo for the treatment of cocaine dependence. DESIGN A four-arm, modified blinded, parallel group study in an out-patient setting using the Cocaine Rapid Efficacy and Safety Trials (CREST) study design. SETTING The study was performed at the New York Medications Development Research Unit (MDRU). PARTICIPANTS All participants met Diagnostic and Statistical Manual version IV (DSM-IV) criteria for cocaine dependence and provided at least two urine samples positive for benzoylecgonine (BE) during the 2-week screening period. Sixty-eight participants were enrolled with 39 completing the study. INTERVENTION After a 2-week screening period, 68 subjects were assigned randomly to receive either olanzapine (10 mg/day), valproate (1500 mg/day), coenzyme Q10 (200 mg/day) and L-carnitine (500 mg/day) combination or placebo for an 8-week treatment period. All subjects also received individual cognitive behavioral counseling during treatment. MEASUREMENTS Primary outcome measures included quantitative urine benzoylecgonine (BE) levels, self-report of drug use, and global impression scores. Secondary outcomes included cocaine craving, study retention and related psychosocial measures. Safety measures included adverse event monitoring, vital signs, and extrapyramidal side-effects tests. RESULTS Study retention was similar across all treatment groups, and all groups showed improvement across most measures of treatment efficacy over the duration of the study. None of the study medications, however, were superior to placebo on any of the primary or secondary outcome measures. Cocaine use, as measured by urine BE levels and self-report, was not significantly lower than placebo in any of the drug treatment groups. All study medications were equally well tolerated, and few medication side effects were observed. CONCLUSION This pilot study does not support the effectiveness of olanzapine, valproate or coenzyme Q10/L-carnitine combination for the treatment of cocaine dependence.
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Affiliation(s)
- Malcolm S Reid
- Department of Psychiatry, New York University School of Medicine, VA New York Harbor Healthcare System, New York, NY 10010, USA.
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Kreek MJ, Schlussman SD, Bart G, Laforge KS, Butelman ER. Evolving perspectives on neurobiological research on the addictions: celebration of the 30th anniversary of NIDA. Neuropharmacology 2004; 47 Suppl 1:324-44. [PMID: 15464148 DOI: 10.1016/j.neuropharm.2004.07.024] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2004] [Revised: 07/02/2004] [Accepted: 07/20/2004] [Indexed: 01/31/2023]
Abstract
The roots of the Laboratory of the Biology of the Addictive Diseases are in the development of methadone maintenance for the treatment of opiate addiction. Methadone maintenance therapy continues to be one of the major effective forms of addiction pharmacotherapy and underscores the importance of biological factors in the physiology and treatment of the addictive diseases. Recent work in the Laboratory has focused on the neurobiological, neurochemical, neuroendocrine and behavioral aspects of addictive diseases (principally cocaine and the opiate addictions), using an interdisciplinary approach. The models we have focused on range from in vitro molecular biology and neuroscience, to in vivo animal models, to experiments in normal human populations and patients with specific addictive diseases, and most recently to the human molecular genetics of different addictive diseases. Two long-term corollary hypotheses have guided the Laboratory's work: (1) That the endogenous opioid peptide/receptor systems play a central role in the addictive states and therefore in their treatment. (2) That atypical responsivity to stressors (e.g., in the hypothalamic-pituitary-adrenal axis) plays a role in vulnerability and relapse to specific addictive diseases. This atypical responsivity may be drug-induced, environmentally acquired, and/or due to genetic variation.
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Affiliation(s)
- Mary Jeanne Kreek
- Laboratory of the Biology of the Addictive Diseases, The Rockefeller University, 1230 York Avenue, Box 171, New York, NY 10021, USA.
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43
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Alexoff DL, Vaska P, Logan J. Imaging dopamine receptors in the rat striatum with the MicroPET R4: kinetic analysis of [11C]raclopride binding using graphical methods. Methods Enzymol 2004; 385:213-28. [PMID: 15130741 DOI: 10.1016/s0076-6879(04)85012-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Affiliation(s)
- David L Alexoff
- Department of Chemistry, Brookhaven National Laboratory, Upton, NY 11973, USA
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Nikolaus S, Beu M, Vosberg H, Müller HW, Larisch R. Quantitative analysis of dopamine D2 receptor kinetics with small animal positron emission tomography. Methods Enzymol 2004; 385:228-39. [PMID: 15130742 DOI: 10.1016/s0076-6879(04)85013-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Affiliation(s)
- Susanne Nikolaus
- Clinic of Nuclear Medicine, University Hospital Düsseldorf, 40225 Düsseldorf, Germany
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45
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Ahmed SH, Koob GF. Changes in response to a dopamine receptor antagonist in rats with escalating cocaine intake. Psychopharmacology (Berl) 2004; 172:450-4. [PMID: 14647962 DOI: 10.1007/s00213-003-1682-9] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2003] [Accepted: 10/22/2003] [Indexed: 11/27/2022]
Abstract
RATIONALE AND OBJECTIVES Prolonged access to cocaine self-administration (long access or LgA) produces an escalation in drug intake not observed with limited access to the drug (short access or ShA). The present study tested the hypothesis that escalating use of cocaine is associated with chronic alterations in dopamine neurotransmission. METHODS After escalation of cocaine self-administration, ShA and LgA rats were challenged with different subcutaneous doses of cis-flupenthixol (10-270 micro g/kg), a highly selective dopamine receptor antagonist. RESULTS In both groups, increasing doses of cis-flupenthixol first produced an increase in the number of cocaine injections and then a dramatic suppression of behavior. This biphasic dose-effect function-which replicates previous findings from this laboratory-was shifted to the left in LgA rats relative to ShA rats, thereby decreasing the threshold dose at which behavior was completely suppressed. CONCLUSIONS These data support the hypothesis that alterations in dopamine neurotransmission contribute to escalation of cocaine self-administration.
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Affiliation(s)
- Serge H Ahmed
- Laboratoire de Neuropsychobiologie Desadaptations, Centre National de la Recherche Scientifique, Unite Mixte de Recherche 5541, Universite Victor Segalen Bordeaux 2, Bordeaux, France
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Nikolaus S, Beu M, Wirrwar A, Vosberg H, Müller HW, Larisch R. The Contribution of Small Animal Positron Emission Tomography to the Neurosciences - A Critical Evaluation. Rev Neurosci 2004; 15:131-56. [PMID: 15202685 DOI: 10.1515/revneuro.2004.15.2.131] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
This article presents an overview of those animal studies which so far have been performed with dedicated small animal positron emission tomographs in the field of the neurosciences. In vivo investigations focus on energy metabolism, perfusion and receptor/transporter binding in rat models of reinforcement, learning and memory, traumatic brain injury, epilepsy, depression, cardiovascular diseases--such as ischemia and focal stroke--and neurodegenerative disorders such as Alzheimer's, Parkinson's and Huntington's disease. In the majority of studies, important novel aspects arise from the fact that the investigators made use of an option inherent to in vivo studies, namely to conduct longitudinal investigations on the same animals. Relevant findings pertain to the relationship of brain metabolism/perfusion and the cholinergic system, the regulation state of dopamine receptors upon cocaine administration and withdrawal, the regulation state of dopamine receptors and transporters in animal models of Parkinson's and Huntington's disease, and potential treatments of progressive dopaminergic depletion with adenoviral vectors, embryonic grafts, stem cells and nerve growth factors.
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Affiliation(s)
- Susanne Nikolaus
- Clinic of Nuclear Medicine, Heinrich-Heine University Düsseldorf, Düsseldorf, Germany
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47
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Paine TA, Dringenberg HC, Olmstead MC. Effects of chronic cocaine on impulsivity: relation to cortical serotonin mechanisms. Behav Brain Res 2003; 147:135-47. [PMID: 14659579 DOI: 10.1016/s0166-4328(03)00156-6] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Drug addiction can be considered an impulse control disorder in that addicts exhibit increased impulsivity on both behavioural and self-report measures. We investigated whether chronic cocaine affects delay of gratification and/or behavioural disinhibition in rats using the delayed reinforcement and Go/No-go paradigms. Animals were treated with saline or cocaine (15 mg/kg) three times per day for 14 days; all behavioural tests occurred prior to daily injections. To assess the effectiveness of the cocaine treatment, sucrose intake, behavioural sensitization and serotonin (5-HT)-dependent (dorsal raphe-stimulated) cortical activation were also measured. Chronic cocaine caused a transient (days 7-8) increase in impulsivity in the delayed reinforcement paradigm, but did not influence behaviour in the Go/No-go paradigm. As expected, chronic cocaine increased behavioural sensitization scores, although it did not affect sucrose consumption. Although, cocaine treatment did not affect dorsal raphe-stimulated electrocorticographic activation, the serotonergic receptor antagonist methiothepin (0.1 mg/kg) was more effective in blocking cortical activation in cocaine- than in saline-treated animals. The electrocorticographic changes may be the result of a pre-synaptic 5-HT deficit and the compensatory supersensitivity of post-synaptic 5-HT receptors. Given the differential time courses of the behavioural and electrocorticographic data, however, this change probably does not mediate the effects of chronic cocaine in the delayed reinforcement paradigm.
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Affiliation(s)
- Tracie A Paine
- Department of Psychology, Queen's University, Kingston, Canada ON, K7L 3N6
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48
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Ahmed SH, Lin D, Koob GF, Parsons LH. Escalation of cocaine self-administration does not depend on altered cocaine-induced nucleus accumbens dopamine levels. J Neurochem 2003; 86:102-13. [PMID: 12807430 DOI: 10.1046/j.1471-4159.2003.01833.x] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Previous studies showed that prolonged access to cocaine or heroin self-administration (long access, or LgA) produces an escalation in drug intake not observed with limited access to the drug (short access, or ShA). The present experiment employed in vivo microdialysis to test the role of alterations in drug pharmacokinetics and/or efficacy in increasing dopamine (DA) levels in the nucleus accumbens (NAcc) during cocaine intake escalation. In experiment 1, both ShA and LgA rats were challenged with passive intravenous administration of cocaine (0.125-1 mg/injection). Regardless of the doses tested, there was no difference between groups in the ability of cocaine to increase NAcc DA levels and no group differences in the temporal profile of dialysate cocaine levels. In experiment 2, cocaine and DA concentrations were measured during cocaine self-administration. Self-administration produced sustained increases of DA in the NAcc with LgA rats maintaining greater steady levels of DA (750% of baseline) than ShA rats (400% of baseline). The difference in the LgA versus ShA rats was not due to differences in the efficacy of cocaine to elevate DA levels, or in the rate of cocaine metabolism, but was directly related to the amount of self-administered cocaine. These findings show that changes in cocaine efficacy or pharmacokinetics do not play a critical role in cocaine intake escalation.
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Affiliation(s)
- Serge H Ahmed
- Department of Neuropharmacology, The Scripps Research Institute, La Jolla, California, USA
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Kawamura K, Oda K, Ishiwata K. Age-related changes of the [11C]CFT binding to the striatal dopamine transporters in the Fischer 344 rats: a PET study. Ann Nucl Med 2003; 17:249-53. [PMID: 12846549 DOI: 10.1007/bf02990030] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
We investigated the age-related changes of the binding of [11C]CFT to striatal dopamine transporters (DATs) in vivo in Fischer 344 rats by positron emission tomography (PET). The tissue dissection method represented an age-related decrease in the uptake ratio of the striatum to the cerebellum and in the specific binding-to-nonspecific binding ratio of [11C]CFT. PET demonstrated an age-dependent decrease in the striatal uptake of [11C]CFT, however, the kinetic analysis represented the age-related decrease in both the association rate constant (k3) and dissociation rate constant (k4), but not the binding potential (k3/k4) that was a parameter including both of density and affinity of the binding sites. The PET finding was not necessarily coincident with the result investigated in vitro previously. Therefore, careful interpretation is necessary for PET studies using [11C]CFT and small animals such as rats.
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Affiliation(s)
- Kazunori Kawamura
- Positron Medical Center, Tokyo Metropolitan Institute of Gerontology, Itabashi, Japan.
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50
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Schlussman SD, Zhang Y, Kane S, Stewart CL, Ho A, Kreek MJ. Locomotion, stereotypy, and dopamine D1 receptors after chronic "binge" cocaine in C57BL/6J and 129/J mice. Pharmacol Biochem Behav 2003; 75:123-31. [PMID: 12759120 DOI: 10.1016/s0091-3057(03)00067-4] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
We have shown that C57BL/6J and 129/J mice differ in their behavioral response to "binge" pattern cocaine (three daily injections of 15 mg/kg separated by 1 h). To determine if these differences persist during chronic binge cocaine administration, we examined the effects of 14-day binge pattern cocaine on home cage behavior. Since the dopamine D(1) receptor may be an important mediator of cocaine-induced locomotor activity, we examined binding to the dopamine D(1) receptor. Locomotor activity was increased by chronic binge cocaine in C57BL/6J (P<.0001) but not in 129/J mice. C57BL/6J mice developed tolerance to the locomotor-activating effects of cocaine. Stereotypic responses were greater in C57BL/6J than in 129/J mice (P=.03), with neither tolerance nor sensitization in either strain. Dopamine D(1) receptor binding in the nucleus accumbens and olfactory tubercle did not differ between strains and was not affected by chronic binge cocaine. In the caudate putamen, subregion specific strain differences in dopamine D(1) receptor binding were observed; chronic binge cocaine increased dopamine D(1) receptor binding in the caudal (P<.05), but not rostral caudate putamen. There was no correlation between locomotor activity or stereotypy and dopamine D(1) receptor density. Thus, with chronic binge cocaine administration, behavioral differences persist between the C57BL/6J and 129/J mice, and cocaine-induced locomotor activity is not correlated with changes in dopamine D(1) receptor binding.
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Affiliation(s)
- Stefan D Schlussman
- The Laboratory of the Biology of Addictive Diseases, The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.
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