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Choi S, Methiwala HN, Graves SM. Isradipine, an L-type calcium channel inhibitor, attenuates cue-associated methamphetamine-seeking in mice. Brain Res 2023; 1818:148528. [PMID: 37567548 PMCID: PMC10530265 DOI: 10.1016/j.brainres.2023.148528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 08/02/2023] [Accepted: 08/08/2023] [Indexed: 08/13/2023]
Abstract
Methamphetamine (meth) is an addictive psychostimulant and there are no FDA-approved treatment options for patients suffering from meth use disorders. In addition to being addictive, meth is also neurotoxic and chronic administration results in degeneration of substantia nigra pars compacta (SNc) dopamine and locus coeruleus (LC) norepinephrine neurons in mice. Optimal treatment strategies for meth use disorders would attenuate maladaptive meth-seeking behavior as well as provide neuroprotection. The L-type calcium channel inhibitor isradipine and the monoamine oxidase (MAO) inhibitor rasagiline both prevent chronic meth-induced SNc and LC degeneration but effects on meth-seeking are unknown. To test whether these clinically available compounds can mitigate meth-seeking, mice were implanted with chronic indwelling jugular vein catheters and allowed to self-administer meth (0.1 mg/kg/infusion) for 10 consecutive days (2-hrs/day) on a fixed ratio (FR) 1 schedule of reinforcement with meth infusions paired to a cue light. One day after the last self-administration session mice were tested for cue-associated meth-seeking behavior wherein the meth-associated cue light was contingently presented but meth reinforcement withheld. Isradipine (3 mg/kg) attenuated cue-associated meth-seeking in both male and female mice. In contrast, rasagiline (1 mg/kg) had no effect on seeking in either sex. These results suggest that isradipine may have the potential to serve as a dual-purpose pharmacotherapy for meth use disorders by attenuating seeking behavior and providing neuroprotection.
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Affiliation(s)
- Sanghoon Choi
- Department of Pharmacology, University of Minnesota, Minneapolis, MN, USA
| | | | - Steven M Graves
- Department of Pharmacology, University of Minnesota, Minneapolis, MN, USA.
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2
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Ubhayarathna M, Langmead CJ, Diepenhorst NA, Stewart GD. Molecular and structural insights into the 5-HT 2C receptor as a therapeutic target for substance use disorders. Br J Pharmacol 2023. [PMID: 37679998 DOI: 10.1111/bph.16233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 08/07/2023] [Accepted: 08/09/2023] [Indexed: 09/09/2023] Open
Abstract
Substance use disorder (SUD) is a chronic condition, with maintained abuse of a substance leading to physiological and psychological alterations and often changes in cognitive and social behaviours. Current therapies include psychotherapy coupled with medication; however, high relapse rates reveal the shortcomings of these therapies. The signalling, expression profile, and neurological function of the serotonin 2C receptor (5-HT2C receptor) make it a candidate of interest for the treatment of SUD. Recently, psychedelics, which broadly act at 5-HT2 receptors, have indicated potential for the treatment of SUD, implicating the 5-HT2C receptor. The modern psychedelic movement has rekindled interest in the 5-HT2C receptor, resulting in many new studies, especially structural analyses. This review explores the structural, molecular and cellular mechanisms governing 5-HT2C receptor function in the context of SUD. This provides the basis of the preclinical and clinical evidence for their role in SUD and highlights the potential for future exploration.
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Affiliation(s)
- Maleesha Ubhayarathna
- Drug Discovery Biology and Neuroscience & Mental Health Therapeutic Program Area, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Australia
- ARC Centre for Cryo-electron Microscopy of Membrane Proteins, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Australia
| | - Christopher J Langmead
- Drug Discovery Biology and Neuroscience & Mental Health Therapeutic Program Area, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Australia
- ARC Centre for Cryo-electron Microscopy of Membrane Proteins, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Australia
- Neuromedicines Discovery Centre, Monash University, Parkville, Australia
| | - Natalie A Diepenhorst
- Drug Discovery Biology and Neuroscience & Mental Health Therapeutic Program Area, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Australia
- ARC Centre for Cryo-electron Microscopy of Membrane Proteins, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Australia
| | - Gregory D Stewart
- Drug Discovery Biology and Neuroscience & Mental Health Therapeutic Program Area, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Australia
- ARC Centre for Cryo-electron Microscopy of Membrane Proteins, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Australia
- Neuromedicines Discovery Centre, Monash University, Parkville, Australia
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3
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Choi S, Du Y, Wokosin DL, Graves SM. Acute and protracted abstinence from methamphetamine bidirectionally changes intrinsic excitability of indirect pathway spiny projection neurons in the dorsomedial striatum. Sci Rep 2022; 12:12116. [PMID: 35840639 PMCID: PMC9287428 DOI: 10.1038/s41598-022-16272-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 07/07/2022] [Indexed: 12/15/2022] Open
Abstract
Methamphetamine (meth) is an addictive psychostimulant and illicit use presents significant personal and socioeconomic harm. Behavioral studies support the involvement of the dorsal striatum in drug-seeking but stimulant induced dysfunction in this region is understudied. The dorsal striatum can be subdivided into the dorsomedial (DMS) and dorsolateral (DLS) striatum with the DMS implicated in goal-directed and DLS in habitual behaviors; both regions are primarily composed of GABAergic direct (dSPNs) and indirect pathway (iSPNs) spiny projection neurons. To examine the effect of repeated meth on SPNs, mice were administered meth (2 mg/kg) for ten consecutive days and intrinsic excitability, dendritic excitability, and spine density were examined. DMS iSPN intrinsic excitability was increased at 1 day but decreased at 21 days of abstinence. In contrast, DMS dSPN intrinsic excitability was unchanged at either timepoint. Dendritic excitability and spine densities were unaltered in DMS iSPNs and dSPNs at 1 and 21 days of abstinence. The effect of repeated meth on iSPN excitability was specific to the DMS; DLS iSPN intrinsic excitability, dendritic excitability, and spine density were unchanged at 1 and 21 days of abstinence. These findings point toward DMS iSPN dysfunction in meth use disorders with differential dysfunction dependent on abstinence duration.
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Affiliation(s)
- Sanghoon Choi
- grid.17635.360000000419368657Department of Pharmacology, University of Minnesota, Minneapolis, MN USA
| | - Yijuan Du
- grid.17635.360000000419368657Department of Pharmacology, University of Minnesota, Minneapolis, MN USA
| | - David L. Wokosin
- grid.16753.360000 0001 2299 3507Department of Neuroscience, Feinberg School of Medicine, Northwestern University, Chicago, IL USA
| | - Steven M. Graves
- grid.17635.360000000419368657Department of Pharmacology, University of Minnesota, Minneapolis, MN USA
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Persons AL, Bradaric BD, Kelly LP, Kousik SM, Graves SM, Yamamoto BK, Napier TC. Gut and brain profiles that resemble pre-motor and early-stage Parkinson's disease in methamphetamine self-administering rats. Drug Alcohol Depend 2021; 225:108746. [PMID: 34098381 PMCID: PMC8483557 DOI: 10.1016/j.drugalcdep.2021.108746] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 04/01/2021] [Accepted: 04/01/2021] [Indexed: 12/18/2022]
Abstract
INTRODUCTION Methamphetamine is a potent psychomotor stimulant, and methamphetamine abusers are up to three times more likely to develop Parkinson's disease (PD) later in life. Prodromal PD may involve gut inflammation and the accumulation of toxic proteins that are transported from the enteric nervous system to the central nervous system to mediate, in part, the degeneration of dopaminergic projections. We hypothesized that self-administration of methamphetamine in rats produces a gut and brain profile that mirrors pre-motor and early-stage PD. METHODS Rats self-administered methamphetamine in daily 3 h sessions for two weeks. Motor function was assessed before self-administration, during self-administration and throughout the 56 days of forced abstinence. Assays for pathogenic markers (tyrosine hydroxylase, glial fibrillary acidic protein (GFAP), α-synuclein) were conducted on brain and gut tissue collected at one or 56 days after cessation of methamphetamine self-administration. RESULTS Motor deficits emerged by day 14 of forced abstinence and progressively worsened up to 56 days of forced abstinence. In the pre-motor stage, we observed increased immunoreactivity for GFAP and α-synuclein within the ganglia of the myenteric plexus in the distal colon. Increased α-synuclein was also observed in the substantia nigra pars compacta. At 56 days, GFAP and α-synuclein normalized in the gut, but the accumulation of nigral α-synuclein persisted, and the dorsolateral striatum exhibited a significant loss of tyrosine hydroxylase. CONCLUSION The pre-motor profile is consistent with gut inflammation and gut/brain α-synuclein accumulation associated with prodromal PD and the eventual development of the neurological disease.
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Affiliation(s)
- Amanda L. Persons
- Department of Pharmacology, Rush University Medical Center, Chicago, IL 60612,Department of Psychiatry and Behavioral Sciences, Rush University Medical Center, Chicago, IL 60612,Department of Physician Assistant Studies, Rush University Medical Center, Chicago, IL 60612,Department of Center for Compulsive Behavior and Addiction, Rush University Medical Center, Chicago, IL 60612
| | - Brinda D. Bradaric
- Department of Pharmacology, Rush University Medical Center, Chicago, IL 60612,Department of Health Sciences, Rush University Medical Center, Chicago, IL 60612,Department of Center for Compulsive Behavior and Addiction, Rush University Medical Center, Chicago, IL 60612
| | - Leo P. Kelly
- Department of Pharmacology, Rush University Medical Center, Chicago, IL 60612
| | - Sharanya M. Kousik
- Department of Pharmacology, Rush University Medical Center, Chicago, IL 60612,Department of Center for Compulsive Behavior and Addiction, Rush University Medical Center, Chicago, IL 60612
| | - Steven M. Graves
- Department of Pharmacology, Rush University Medical Center, Chicago, IL 60612,Department of Center for Compulsive Behavior and Addiction, Rush University Medical Center, Chicago, IL 60612
| | - Bryan K. Yamamoto
- Department of Pharmacology and Toxicology, Indiana University School of Medicine, Indianapolis, IN 46202
| | - T. Celeste Napier
- Department of Pharmacology, Rush University Medical Center, Chicago, IL 60612,Department of Psychiatry and Behavioral Sciences, Rush University Medical Center, Chicago, IL 60612,Department of Center for Compulsive Behavior and Addiction, Rush University Medical Center, Chicago, IL 60612
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Bombardi C, Delicata F, Tagliavia C, Grandis A, Pierucci M, Marino Gammazza A, Casarrubea M, De Deurwaerdère P, Di Giovanni G. Lateral Habenula 5-HT 2C Receptor Function Is Altered by Acute and Chronic Nicotine Exposures. Int J Mol Sci 2021; 22:ijms22094775. [PMID: 33946328 PMCID: PMC8124296 DOI: 10.3390/ijms22094775] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 04/25/2021] [Accepted: 04/27/2021] [Indexed: 12/11/2022] Open
Abstract
Serotonin (5-HT) is important in some nicotine actions in the CNS. Among all the 5-HT receptors (5-HTRs), the 5-HT2CR has emerged as a promising drug target for smoking cessation. The 5-HT2CRs within the lateral habenula (LHb) may be crucial for nicotine addiction. Here we showed that after acute nicotine tartrate (2 mg/kg, i.p.) exposure, the 5-HT2CR agonist Ro 60-0175 (5–640 µg/kg, i.v.) increased the electrical activity of 42% of the LHb recorded neurons in vivo in rats. Conversely, after chronic nicotine treatment (6 mg/kg/day, i.p., for 14 days), Ro 60-0175 was incapable of affecting the LHb neuronal discharge. Moreover, acute nicotine exposure increased the 5-HT2CR-immunoreactive (IR) area while decreasing the number of 5-HT2CR-IR neurons in the LHb. On the other hand, chronic nicotine increased both the 5-HT2CR-IR area and 5-HT2CR-IR LHb neurons in the LHb. Western blot analysis confirmed these findings and further revealed an increase of 5-HT2CR expression in the medial prefrontal cortex after chronic nicotine exposure not detected by the immunohistochemistry. Altogether, these data show that acute and chronic nicotine exposure differentially affect the central 5-HT2CR function mainly in the LHb and this may be relevant in nicotine addiction and its treatment.
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Affiliation(s)
- Cristiano Bombardi
- Department of Veterinary Medical Sciences, University of Bologna, Via Tolara di Sopra, 50, 40064 Ozzano dell’Emilia, Italy; (C.B.); (C.T.); (A.G.)
| | - Francis Delicata
- Laboratory of Neurophysiology, Department of Physiology and Biochemistry, Faculty of Medicine and Surgery, University of Malta, MSD2080 Msida, Malta; (F.D.); (M.P.)
| | - Claudio Tagliavia
- Department of Veterinary Medical Sciences, University of Bologna, Via Tolara di Sopra, 50, 40064 Ozzano dell’Emilia, Italy; (C.B.); (C.T.); (A.G.)
| | - Annamaria Grandis
- Department of Veterinary Medical Sciences, University of Bologna, Via Tolara di Sopra, 50, 40064 Ozzano dell’Emilia, Italy; (C.B.); (C.T.); (A.G.)
| | - Massimo Pierucci
- Laboratory of Neurophysiology, Department of Physiology and Biochemistry, Faculty of Medicine and Surgery, University of Malta, MSD2080 Msida, Malta; (F.D.); (M.P.)
| | - Antonella Marino Gammazza
- Section of Human Anatomy, Department of Biomedicine, Neuroscience and Advanced Diagnostics (BiND), University of Palermo, 90127 Palermo, Italy;
| | - Maurizio Casarrubea
- Laboratory of Behavioral Physiology, Human Physiology Section “Giuseppe Pagano”, Department of Biomedicine, Neuroscience and Advanced Diagnostics (BiND), University of Palermo, 90127 Palermo, Italy;
| | - Philippe De Deurwaerdère
- Unité Mixte de Recherche 5287, Centre National de la Recherche Scientifique, 146 rue Léo Saignat, B.P.281, CEDEX, F-33000 Bordeaux, France;
| | - Giuseppe Di Giovanni
- Laboratory of Neurophysiology, Department of Physiology and Biochemistry, Faculty of Medicine and Surgery, University of Malta, MSD2080 Msida, Malta; (F.D.); (M.P.)
- School of Biosciences, Cardiff University, Cardiff CF10 3AX, UK
- Correspondence: or ; Tel.: +356-23402776
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Campbell EJ, Bonomo Y, Pastor A, Collins L, Norman A, Galettis P, Johnstone J, Lawrence AJ. The 5-HT 2C receptor as a therapeutic target for alcohol and methamphetamine use disorders: A pilot study in treatment-seeking individuals. Pharmacol Res Perspect 2021; 9:e00767. [PMID: 33929084 PMCID: PMC8085921 DOI: 10.1002/prp2.767] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Accepted: 03/05/2021] [Indexed: 12/30/2022] Open
Abstract
Alcohol use disorder (AUD) and methamphetamine use disorder (MUD) are prevalent and have high adverse impacts on both the individual and society. Current treatment strategies for these disorders are ineffective at a population level. Lorcaserin, a 5‐HT2C receptor agonist, has shown potential at reducing the symptoms of substance use disorder. This pilot study (initiated prior to market withdrawal) examined feasibility and safety of lorcaserin treatment in people undergoing residential detoxification and treatment for AUD and MUD. This was an open label pilot study of lorcaserin where participants (n = 10 AUD; n = 8 MUD) received 10‐mg lorcaserin daily for 4 days then twice daily for 1 month. Primary outcome measures included recruitment and retention rate, incidence of treatment‐emergent events, incidence of methamphetamine or alcohol withdrawal‐related events, heart rate, and blood pressure. Secondary measures included pharmacokinetic data and self‐reported alcohol or methamphetamine use, craving, and psychological distress. AUD participants were recruited faster and had a greater retention rate compared with MUD participants. Lorcaserin did not alter vital signs, was well tolerated, and had a similar pharmacokinetic profile to individuals with obesity. Lorcaserin reduced self‐reported alcohol and amphetamine‐type substance use and craving in AUD and MUD participants, respectively. Self‐reported psychological health also improved over the treatment period for all participants. Despite the pilot nature of this study, our data support the notion of 5‐HT2C receptors as a therapeutic target for drug and alcohol abuse.
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Affiliation(s)
- Erin J Campbell
- Florey Institute of Neuroscience and Mental Health, Melbourne Brain Centre, The University of Melbourne, Parkville, VIC, Australia
| | - Yvonne Bonomo
- Department of Addiction Medicine, St Vincent's Hospital Melbourne, The University of Melbourne, Parkville, VIC, Australia
| | - Adam Pastor
- Department of Addiction Medicine, St Vincent's Hospital Melbourne, The University of Melbourne, Parkville, VIC, Australia
| | - Lisa Collins
- Department of Addiction Medicine, St Vincent's Hospital Melbourne, The University of Melbourne, Parkville, VIC, Australia
| | - Amanda Norman
- Department of Addiction Medicine, St Vincent's Hospital Melbourne, The University of Melbourne, Parkville, VIC, Australia
| | - Peter Galettis
- School of Medicine and Public Health, The University of Newcastle, Callaghan, NSW, Australia
| | - Janice Johnstone
- School of Medicine and Public Health, The University of Newcastle, Callaghan, NSW, Australia
| | - Andrew J Lawrence
- Florey Institute of Neuroscience and Mental Health, Melbourne Brain Centre, The University of Melbourne, Parkville, VIC, Australia
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7
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Ohene-Nyako M, Persons AL, Napier TC. Hippocampal blood-brain barrier of methamphetamine self-administering HIV-1 transgenic rats. Eur J Neurosci 2021; 53:416-429. [PMID: 32725911 PMCID: PMC9949894 DOI: 10.1111/ejn.14925] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Revised: 07/19/2020] [Accepted: 07/20/2020] [Indexed: 12/16/2022]
Abstract
Combined antiretroviral therapy for HIV infection reduces plasma viral load and prolongs life. However, the brain is a viral reservoir, and pathologies such as cognitive decline and blood-brain barrier (BBB) disruption persist. Methamphetamine abuse is prevalent among HIV-infected individuals. Methamphetamine and HIV toxic proteins can disrupt the BBB, but it is unclear if there exists a common pathway by which HIV proteins and methamphetamine induce BBB damage. Also unknown are the BBB effects imposed by chronic exposure to HIV proteins in the comorbid context of chronic methamphetamine abuse. To evaluate these scenarios, we trained HIV-1 transgenic (Tg) and non-Tg rats to self-administer methamphetamine using a 21-day paradigm that produced an equivalency dose range at the low end of the amounts self-titrated by humans. Markers of BBB integrity were measured for the hippocampus, a brain region involved in cognitive function. Outcomes revealed that tight junction proteins, claudin-5 and occludin, were reduced in Tg rats independent of methamphetamine, and this co-occurred with increased levels of lipopolysaccharide, albumin (indicating barrier breakdown) and matrix metalloproteinase-9 (MMP-9; indicating barrier matrix disruption); reductions in GFAP (indicating astrocytic dysfunction); and microglial activation (indicating inflammation). Evaluations of markers for two signaling pathways that regulate MMP-9 transcription, NF-κB and ERK/∆FosB revealed an overall genotype effect for NF-κB. Methamphetamine did not alter measurements from Tg rats, but in non-Tg rats, methamphetamine reduced occludin and GFAP, and increased MMP-9 and NF-κB. Study outcomes suggest that BBB dysregulation resulting from chronic exposure to HIV-1 proteins or methamphetamine both involve NF-κB/MMP-9.
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Affiliation(s)
- Michael Ohene-Nyako
- Department of Pharmacology, Rush University, Chicago, IL, USA,Department of Physician Assistant Studies, Rush University, Chicago, IL, USA
| | - Amanda L. Persons
- Department of Physician Assistant Studies, Rush University, Chicago, IL, USA,Department of Psychiatry and Behavioral Sciences, Rush University, Chicago, IL, USA,Center for Compulsive Behavior and Addiction, Rush University, Chicago, IL, USA
| | - T. Celeste Napier
- Department of Pharmacology, Rush University, Chicago, IL, USA,Department of Physician Assistant Studies, Rush University, Chicago, IL, USA,Center for Compulsive Behavior and Addiction, Rush University, Chicago, IL, USA
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8
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Romanova IV, Morina IY, Shpakov AO. Localization of 5-HT2C and
5-HT1B Serotonin Receptors in Orexinergic
Neurons of the Hypothlamic Perifornical Area of Rodents. J EVOL BIOCHEM PHYS+ 2020. [DOI: 10.1134/s0022093020020076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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9
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De Deurwaerdère P, Bharatiya R, Chagraoui A, Di Giovanni G. Constitutive activity of 5-HT receptors: Factual analysis. Neuropharmacology 2020; 168:107967. [DOI: 10.1016/j.neuropharm.2020.107967] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 12/26/2019] [Accepted: 01/12/2020] [Indexed: 12/16/2022]
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10
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Delint-Ramirez I, Garcia-Oscos F, Segev A, Kourrich S. Cocaine engages a non-canonical, dopamine-independent, mechanism that controls neuronal excitability in the nucleus accumbens. Mol Psychiatry 2020; 25:680-691. [PMID: 29880884 PMCID: PMC7042730 DOI: 10.1038/s41380-018-0092-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Revised: 04/03/2018] [Accepted: 04/13/2018] [Indexed: 11/25/2022]
Abstract
Drug-induced enhanced dopamine (DA) signaling in the brain is a canonical mechanism that initiates addiction processes. However, indirect evidence suggests that cocaine also triggers non-canonical, DA-independent, mechanisms that contribute to behavioral responses to cocaine, including psychomotor sensitization and cocaine self-administration. Identifying these mechanisms and determining how they are initiated is fundamental to further our understanding of addiction processes. Using physiologically relevant in vitro tractable models, we found that cocaine-induced hypoactivity of nucleus accumbens shell (NAcSh) medium spiny neurons (MSNs), one hallmark of cocaine addiction, is independent of DA signaling. Combining brain slice studies and site-directed mutagenesis in HEK293T cells, we found that cocaine binding to intracellular sigma-1 receptor (σ1) initiates this mechanism. Subsequently, σ1 binds to Kv1.2 potassium channels, followed by accumulation of Kv1.2 in the plasma membrane, thereby depressing NAcSh MSNs firing. This mechanism is specific to D1 receptor-expressing MSNs. Our study uncovers a mechanism for cocaine that bypasses DA signaling and leads to addiction-relevant neuroadaptations, thereby providing combinatorial strategies for treating stimulant abuse.
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Affiliation(s)
- Ilse Delint-Ramirez
- 0000 0000 9482 7121grid.267313.2Department of Psychiatry, University of Texas Southwestern Medical Center, Dallas, TX 75390 USA
| | - Francisco Garcia-Oscos
- 0000 0000 9482 7121grid.267313.2Department of Psychiatry, University of Texas Southwestern Medical Center, Dallas, TX 75390 USA
| | - Amir Segev
- 0000 0000 9482 7121grid.267313.2Department of Psychiatry, University of Texas Southwestern Medical Center, Dallas, TX 75390 USA
| | - Saïd Kourrich
- Department of Psychiatry, University of Texas Southwestern Medical Center, Dallas, TX, 75390, USA.
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11
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Soriani O, Kourrich S. The Sigma-1 Receptor: When Adaptive Regulation of Cell Electrical Activity Contributes to Stimulant Addiction and Cancer. Front Neurosci 2019; 13:1186. [PMID: 31780884 PMCID: PMC6861184 DOI: 10.3389/fnins.2019.01186] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Accepted: 10/21/2019] [Indexed: 12/17/2022] Open
Abstract
The sigma-1 receptor (σ1R) is an endoplasmic reticulum (ER)-resident chaperone protein that acts like an inter-organelle signaling modulator. Among its several functions such as ER lipid metabolisms/transports and indirect regulation of genes transcription, one of its most intriguing feature is the ability to regulate the function and trafficking of a variety of functional proteins. To date, and directly relevant to the present review, σ1R has been found to regulate both voltage-gated ion channels (VGICs) belonging to distinct superfamilies (i.e., sodium, Na+; potassium, K+; and calcium, Ca2+ channels) and non-voltage-gated ion channels. This regulatory function endows σ1R with a powerful capability to fine tune cells’ electrical activity and calcium homeostasis—a regulatory power that appears to favor cell survival in pathological contexts such as stroke or neurodegenerative diseases. In this review, we present the current state of knowledge on σ1R’s role in the regulation of cellular electrical activity, and how this seemingly adaptive function can shift cell homeostasis and contribute to the development of very distinct chronic pathologies such as psychostimulant abuse and tumor cell growth in cancers.
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Affiliation(s)
| | - Saïd Kourrich
- Département des Sciences Biologiques, Université du Québec à Montréal, Montréal, QC, Canada.,Centre d'Excellence en Recherche sur les Maladies Orphelines - Fondation Courtois, Université du Québec à Montréal, Montréal, QC, Canada.,Department of Psychiatry, University of Texas Southwestern Medical Center, Dallas, TX, United States.,Department of Neuroscience, University of Texas Southwestern Medical Center, Dallas, TX, United States
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12
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AMPA receptor and metabotropic glutamate receptor 1 adaptations in the nucleus accumbens core during incubation of methamphetamine craving. Neuropsychopharmacology 2019; 44:1534-1541. [PMID: 31146278 PMCID: PMC6785134 DOI: 10.1038/s41386-019-0425-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 04/30/2019] [Accepted: 05/20/2019] [Indexed: 12/15/2022]
Abstract
Cue-induced drug craving progressively intensifies after withdrawal from self-administration of cocaine, methamphetamine, and other drugs of abuse, a phenomenon termed incubation of craving. For cocaine and methamphetamine, expression of incubated craving ultimately depends on strengthening of nucleus accumbens (NAc) synapses through an accumulation of high conductance Ca2+-permeable AMPA receptors (CP-AMPARs) that is detectable with electrophysiological approaches. This study sought to further characterize glutamate receptor adaptations in NAc core during methamphetamine incubation. Previous biochemical studies revealed that the CP-AMPARs accumulating after cocaine incubation are mainly homomeric GluA1 receptors and that their accumulation is reflected by increased cell surface GluA1. Here, for methamphetamine, we observed no significant change in surface or total GluA1 (GluA2 and GluA3 were also unchanged). Nonetheless, GluA1 translation was elevated after incubation of methamphetamine craving, as recently found for cocaine. Additionally, for cocaine, we previously observed a withdrawal-dependent decrease in mGlu1 surface expression that precedes and enables CP-AMPAR accumulation and incubation of craving, reflecting weakening of mGlu1-dependent mechanisms that normally limit synaptic CP-AMPAR levels in the NAc core. Here, we observed no change in surface or total mGlu1 protein or its coupling to Homer scaffolding proteins after methamphetamine withdrawal, nor did elevation of mGlu1 tone through repeated injections of an mGlu1-positive allosteric modulator delay incubation of craving. These findings suggest a common role for increased GluA1 translation, but not decreased mGlu1 function, in the incubation of methamphetamine and cocaine craving. We speculate that increased GluA1 translation near synapses may drive formation and synaptic insertion of homomeric GluA1 receptors in the absence of detectable changes in GluA1 protein levels.
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13
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Dave S, Chen L, Yu C, Seaton M, Khodr CE, Al-Harthi L, Hu XT. Methamphetamine decreases K + channel function in human fetal astrocytes by activating the trace amine-associated receptor type-1. J Neurochem 2018; 148:29-45. [PMID: 30295919 DOI: 10.1111/jnc.14606] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Revised: 09/28/2018] [Accepted: 10/03/2018] [Indexed: 12/22/2022]
Abstract
Methamphetamine (Meth) is a potent and commonly abused psychostimulant. Meth alters neuron and astrocyte activity; yet the underlying mechanism(s) is not fully understood. Here we assessed the impact of acute Meth on human fetal astrocytes (HFAs) using whole-cell patch-clamping. We found that HFAs displayed a large voltage-gated K+ efflux (IKv ) through Kv /Kv -like channels during membrane depolarization, and a smaller K+ influx (Ikir ) via inward-rectifying Kir /Kir -like channels during membrane hyperpolarization. Meth at a 'recreational' (20 μM) or toxic/fatal (100 μM) concentration depolarized resting membrane potential (RMP) and suppressed IKv/Kv-like . These changes were associated with a decreased time constant (Ƭ), and mimicked by blocking the two-pore domain K+ (K2P )/K2P -like and Kv /Kv -like channels, respectively. Meth also diminished IKir/Kir-like , but only at toxic/fatal levels. Given that Meth is a potent agonist for the trace amine-associated receptor type-1 (TAAR1), and TAAR1-coupled cAMP/cAMP-activated protein kinase (PKA) cascade, we further evaluated whether the Meth impact on K+ efflux was mediated by this pathway. We found that antagonizing TAAR1 with N-(3-Ethoxyphenyl)-4-(1-pyrrolidinyl)-3-(trifluoromethyl)benzamide (EPPTB) reversed Meth-induced suppression of IKv/Kv-like ; and inhibiting PKA activity by H89 abolished Meth effects on suppressing IKv/Kv-like . Antagonizing TAAR1 might also attenuate Meth-induced RMP depolarization. Voltage-gated Ca2+ currents were not detected in HFAs. These novel findings demonstrate that Meth suppresses IKv/Kv-like by facilitating the TAAR1/Gs /cAMP/PKA cascade and altering the kinetics of Kv /Kv -like channel gating, but reduces K2P /K2P -like channel activity through other pathway(s), in HFAs. Given that Meth-induced decrease in astrocytic K+ efflux through K2P /K2P -like and Kv /Kv -like channels reduces extracellular K+ levels, such reduction could consequently contribute to a decreased excitability of surrounding neurons. OPEN SCIENCE BADGES: This article has received a badge for *Open Materials* because it provided all relevant information to reproduce the study in the manuscript. The complete Open Science Disclosure form for this article can be found at the end of the article. More information about the Open Practices badges can be found at https://cos.io/our-services/open-science-badges/.
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Affiliation(s)
- Sonya Dave
- Department of Microbial Pathogens and Immunity, Rush University Medical Center, Chicago, Illinois, USA
| | - Lihua Chen
- Department of Microbial Pathogens and Immunity, Rush University Medical Center, Chicago, Illinois, USA
| | - Chunjiang Yu
- Department of Microbial Pathogens and Immunity, Rush University Medical Center, Chicago, Illinois, USA
| | - Melanie Seaton
- Department of Microbial Pathogens and Immunity, Rush University Medical Center, Chicago, Illinois, USA
| | - Christina E Khodr
- Department of Microbial Pathogens and Immunity, Rush University Medical Center, Chicago, Illinois, USA
| | - Lena Al-Harthi
- Department of Microbial Pathogens and Immunity, Rush University Medical Center, Chicago, Illinois, USA
| | - Xiu-Ti Hu
- Department of Microbial Pathogens and Immunity, Rush University Medical Center, Chicago, Illinois, USA
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14
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Flack A, Persons AL, Kousik SM, Celeste Napier T, Moszczynska A. Self-administration of methamphetamine alters gut biomarkers of toxicity. Eur J Neurosci 2018; 46:1918-1932. [PMID: 28661099 DOI: 10.1111/ejn.13630] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Revised: 06/21/2017] [Accepted: 06/22/2017] [Indexed: 12/13/2022]
Abstract
Methamphetamine (METH) is a highly abused psychostimulant that is associated with an increased risk for developing Parkinson's disease (PD). This enhanced vulnerability likely relates to the toxic effects of METH that overlap with PD pathology, for example, aberrant functioning of α-synuclein and parkin. In PD, peripheral factors are thought to contribute to central nervous system (CNS) degeneration. For example, α-synuclein levels in the enteric nervous system (ENS) are elevated, and this precedes the onset of motor symptoms. It remains unclear whether neurons of the ENS, particularly catecholaminergic neurons, exhibit signs of METH-induced toxicity as seen in the CNS. The aim of this study was to determine whether self-administered METH altered the levels of α-synuclein, parkin, tyrosine hydroxylase (TH), and dopamine-β-hydroxylase (DβH) in the myenteric plexus of the distal colon ENS. Young adult male Sprague-Dawley rats self-administered METH for 3 h per day for 14 days and controls were saline-yoked. Distal colon tissue was collected at 1, 14, or 56 days after the last operant session. Levels of α-synuclein were increased, while levels of parkin, TH, and DβH were decreased in the myenteric plexus in the METH-exposed rats at 1 day following the last operant session and returned to the control levels after 14 or 56 days of forced abstinence. The changes were not confined to neurofilament-positive neurons. These results suggest that colon biomarkers may provide early indications of METH-induced neurotoxicity, particularly in young chronic METH users who may be more susceptible to progression to PD later in life.
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Affiliation(s)
- Amanda Flack
- Department of Pharmaceutical Sciences, Wayne State University, Eugene Applebaum College of Pharmaceutical Sciences, Detroit, MI, 48201, USA
| | - Amanda L Persons
- Center for Compulsive Behavior and Addiction, Rush University Medical Center, Chicago, IL, USA.,Department of Pharmacology, Rush University Medial Center, Chicago, IL, USA
| | - Sharanya M Kousik
- Center for Compulsive Behavior and Addiction, Rush University Medical Center, Chicago, IL, USA.,Department of Pharmacology, Rush University Medial Center, Chicago, IL, USA
| | - T Celeste Napier
- Center for Compulsive Behavior and Addiction, Rush University Medical Center, Chicago, IL, USA.,Department of Pharmacology, Rush University Medial Center, Chicago, IL, USA.,Department of Psychiatry, Rush University Medical Center, Chicago, IL, USA
| | - Anna Moszczynska
- Department of Pharmaceutical Sciences, Wayne State University, Eugene Applebaum College of Pharmaceutical Sciences, Detroit, MI, 48201, USA
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15
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Shahidi S, Komaki A, Sadeghian R, Soleimani Asl S. Effect of a 5-HT 1D receptor agonist on the reinstatement phase of the conditioned place preference test and hippocampal long-term potentiation in methamphetamine-treated rats. Brain Res 2018; 1698:151-160. [PMID: 30076792 DOI: 10.1016/j.brainres.2018.07.030] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 07/26/2018] [Accepted: 07/31/2018] [Indexed: 12/20/2022]
Abstract
Methamphetamine (METH)-seeking relapse is associated with memory and synaptic plasticity changes. Serotonin is a key neuromodulator in this process. While there is a known distribution of 5-HT1D receptors in reward and memory areas, such as the hippocampus, its physiological function is currently unknown. Here, we evaluated effect of a 5-HT1D receptor agonist, PNU142633, on the reinstatement of METH-seeking behavior and long-term potentiation. Rats were implanted with a cannula into lateral ventricle, then treated with saline or METH (5 mg/kg) during the acquisition phase of the conditioned place preference (CPP) test. On day 13 of the extinction phase, METH groups were divided into four groups: METH (0: saline, 1, or 2.5 (priming METH) mg/kg; i.p.) + vehicle (5 µl/rat) or a priming dose of METH (2.5 mg/kg; i.p.) + PNU (2 µg/5 µl; i.c.v.) and their preference scores were calculated on reinstatement day (day 14). Immediately following this, electrophysiology was performed to assay the field excitatory postsynaptic potential (fEPSP) slope and population spike (PS) amplitude between groups. The results showed that CPP induction by METH gradually declined to extinction on days 12 and 13. A priming METH treatment significantly increased preference for the METH-paired chamber when compared with other groups, but pre-treatment with PNU significantly attenuated this effect. PS amplitude and fEPSP slopes in vehicle + priming METH rats were greater when compared with other groups. Furthermore, PNU attenuated the priming METH-induced increase in PS amplitude. These findings suggest that PNU can decrease synaptic transmission and prevent METH reinstatement in rats.
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Affiliation(s)
- Siamak Shahidi
- Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Alireza Komaki
- Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Reihaneh Sadeghian
- Neurophysiology Research Center, Hamadan University of Medical Sciences, Hamadan, Iran.
| | - Sara Soleimani Asl
- Anatomy Departments, School of Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
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16
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Ohene-Nyako M, Persons AL, Napier TC. Region-specific changes in markers of neuroplasticity revealed in HIV-1 transgenic rats by low-dose methamphetamine. Brain Struct Funct 2018; 223:3503-3513. [PMID: 29931627 DOI: 10.1007/s00429-018-1701-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Accepted: 06/15/2018] [Indexed: 12/15/2022]
Abstract
Methamphetamine abuse co-occurring with HIV infection presents neuropathology in brain regions that mediate reward and motivation. A neuronal signaling cascade altered acutely by meth and some HIV-1 proteins is the mitogen-activated protein kinase (MAPK) pathway. It remains unknown if chronic co-exposure to meth and HIV-1 proteins converge on MAPK in vivo. To make this determination, we studied young adult Fischer 344 HIV-1 transgenic (Tg) and non-Tg rats that self-administered meth (0.02-0.04 mg/kg/0.05 ml iv infusion, 2 h/day for 21 days) and their saline-yoked controls. One day following the operant task, rats were killed. Brain regions involved in reward-motivation [i.e., nucleus accumbens (NA) and ventral pallidum (VP)], were assayed for a MAPK cascade protein, extracellular signal-regulated kinase (ERK), and a downstream transcription factor, ΔFosB. In the NA, activated (phosphorylated; p) ERK-to-ERK ratio (pERK/ERK) was increased in meth-exposed Tg rats versus saline Tg controls, and versus meth non-Tg rats. ΔFosB was increased in meth Tg rats versus saline and meth non-Tg rats. Assessment of two targets of ΔFosB-regulated transcription revealed (1) increased dopamine D1 receptor (D1R) immunoreactivity in the NA shell of Tg-meth rats versus saline Tg controls, but (2) no changes in the AMPA receptor subunit, GluA2. No changes related to genotype or meth occurred for ERK, ΔFosB or D1R protein in the VP. Results reveal a region-specific activation of ERK, and increases in ΔFosB and D1R expression induced by HIV-1 proteins and meth. Such effects may contribute to the neuronal and behavioral pathology associated with meth/HIV comorbidity.
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Affiliation(s)
- Michael Ohene-Nyako
- Department of Pharmacology, Rush University, Chicago, IL, USA.,Center for Compulsive Behavior and Addiction, Rush University, Chicago, IL, USA
| | - Amanda L Persons
- Department of Physician Assistant Studies, Rush University, Chicago, IL, USA.,Department of Psychiatry, Rush University Medical Center, 1735 W. Harrison Street, Cohn Research Building Suite #424, Chicago, IL, 60612, USA.,Center for Compulsive Behavior and Addiction, Rush University, Chicago, IL, USA
| | - T Celeste Napier
- Department of Psychiatry, Rush University Medical Center, 1735 W. Harrison Street, Cohn Research Building Suite #424, Chicago, IL, 60612, USA. .,Center for Compulsive Behavior and Addiction, Rush University, Chicago, IL, USA.
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17
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Cai W, Xue C, Sakaguchi M, Konishi M, Shirazian A, Ferris HA, Li ME, Yu R, Kleinridders A, Pothos EN, Kahn CR. Insulin regulates astrocyte gliotransmission and modulates behavior. J Clin Invest 2018; 128:2914-2926. [PMID: 29664737 DOI: 10.1172/jci99366] [Citation(s) in RCA: 133] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 04/10/2018] [Indexed: 01/16/2023] Open
Abstract
Complications of diabetes affect tissues throughout the body, including the central nervous system. Epidemiological studies show that diabetic patients have an increased risk of depression, anxiety, age-related cognitive decline, and Alzheimer's disease. Mice lacking insulin receptor (IR) in the brain or on hypothalamic neurons display an array of metabolic abnormalities; however, the role of insulin action on astrocytes and neurobehaviors remains less well studied. Here, we demonstrate that astrocytes are a direct insulin target in the brain and that knockout of IR on astrocytes causes increased anxiety- and depressive-like behaviors in mice. This can be reproduced in part by deletion of IR on astrocytes in the nucleus accumbens. At a molecular level, loss of insulin signaling in astrocytes impaired tyrosine phosphorylation of Munc18c. This led to decreased exocytosis of ATP from astrocytes, resulting in decreased purinergic signaling on dopaminergic neurons. These reductions contributed to decreased dopamine release from brain slices. Central administration of ATP analogs could reverse depressive-like behaviors in mice with astrocyte IR knockout. Thus, astrocytic insulin signaling plays an important role in dopaminergic signaling, providing a potential mechanism by which astrocytic insulin action may contribute to increased rates of depression in people with diabetes, obesity, and other insulin-resistant states.
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Affiliation(s)
- Weikang Cai
- Section of Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Chang Xue
- Program in Pharmacology and Experimental Therapeutics and Pharmacology and Drug Development, Sackler School of Graduate Biomedical Sciences and Department of Immunology, Tufts University School of Medicine, Boston, Massachusetts, USA
| | - Masaji Sakaguchi
- Section of Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts, USA.,Department of Metabolic Medicine, Kumamoto University, Kumamoto, Japan
| | - Masahiro Konishi
- Section of Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Alireza Shirazian
- Public Health and Professional Degree Programs, Tufts University School of Medicine, Boston, Massachusetts, USA
| | - Heather A Ferris
- Section of Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts, USA.,Division of Endocrinology and Metabolism, Department of Medicine, University of Virginia, Charlottesville, Virginia, USA
| | - Mengyao E Li
- Section of Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Ruichao Yu
- Section of Pathophysiology and Molecular Pharmacology, Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Andre Kleinridders
- Section of Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts, USA.,German Institute of Human Nutrition Potsdam-Rehbrücke, Nuthetal, Germany.,National Center for Diabetes Research (DZD), Neuherberg, Germany
| | - Emmanuel N Pothos
- Program in Pharmacology and Experimental Therapeutics and Pharmacology and Drug Development, Sackler School of Graduate Biomedical Sciences and Department of Immunology, Tufts University School of Medicine, Boston, Massachusetts, USA
| | - C Ronald Kahn
- Section of Integrative Physiology and Metabolism, Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts, USA
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18
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Abstract
Classic hallucinogens share pharmacology as serotonin 5-HT2A, 5-HT2B, and 5-HT2C receptor agonists. Unique among most other Schedule 1 drugs, they are generally non-addictive and can be effective tools in the treatment of addiction. Mechanisms underlying these attributes are largely unknown. However, many preclinical studies show that 5-HT2C agonists counteract the addictive effects of drugs from several classes, suggesting this pharmacological property of classic hallucinogens may be significant. Drawing from a comprehensive analysis of preclinical behavior, neuroanatomy, and neurochemistry studies, this review builds rationale for this hypothesis, and also proposes a testable, neurobiological framework. 5-HT2C agonists work, in part, by modulating dopamine neuron activity in the ventral tegmental area-nucleus accumbens (NAc) reward pathway. We argue that activation of 5-HT2C receptors on NAc shell, GABAergic, medium spiny neurons inhibits potassium Kv1.x channels, thereby enhancing inhibitory activity via intrinsic mechanisms. Together with experiments that show that addictive drugs, such as cocaine, potentiate Kv1.x channels, thereby suppressing NAc shell GABAergic activity, this hypothesis provides a mechanism by which classic hallucinogen-mediated stimulation of 5-HT2C receptors could thwart addiction. It also provides a potential reason for the non-addictive nature of classic hallucinogens.
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Affiliation(s)
- Clinton E Canal
- Center for Drug Discovery, Department of Pharmaceutical Sciences, Northeastern University, Boston, USA
| | - Kevin S Murnane
- Department of Pharmaceutical Sciences, Mercer University College of Pharmacy, Mercer University Health Sciences Center, Atlanta, USA
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19
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Scheyer AF, Loweth JA, Christian DT, Uejima J, Rabei R, Le T, Dolubizno H, Stefanik MT, Murray CH, Sakas C, Wolf ME. AMPA Receptor Plasticity in Accumbens Core Contributes to Incubation of Methamphetamine Craving. Biol Psychiatry 2016; 80:661-670. [PMID: 27264310 PMCID: PMC5050076 DOI: 10.1016/j.biopsych.2016.04.003] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Revised: 04/01/2016] [Accepted: 04/01/2016] [Indexed: 12/17/2022]
Abstract
BACKGROUND The incubation of cue-induced drug craving in rodents provides a model of persistent vulnerability to craving and relapse in human addicts. After prolonged withdrawal, incubated cocaine craving depends on strengthening of nucleus accumbens (NAc) core synapses through incorporation of Ca2+-permeable alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptors (CP-AMPARs). Through metabotropic glutamate receptor 1 (mGluR1)-mediated synaptic depression, mGluR1 positive allosteric modulators remove CP-AMPARs from these synapses and thereby reduce cocaine craving. This study aimed to determine if similar plasticity accompanies incubation of methamphetamine craving. METHODS Rats self-administered saline or methamphetamine under extended-access conditions. Cue-induced seeking tests demonstrated incubation of methamphetamine craving. After withdrawal periods ranging from 1 to >40 days, rats underwent one of the following procedures: 1) whole-cell patch clamp recordings to characterize AMPAR transmission, 2) intra-NAc core injection of the CP-AMPAR antagonist 1-naphthyl acetyl spermine followed by a seeking test, or 3) systemic administration of a mGluR1 positive allosteric modulator followed by a seeking test. RESULTS Incubation of methamphetamine craving was associated with CP-AMPAR accumulation in NAc core, and both effects were maximal after ~1 week of withdrawal. Expression of incubated craving was decreased by intra-NAc core 1-naphthyl acetyl spermine injection or systemic mGluR1 positive allosteric modulator administration. CONCLUSIONS These results are the first to demonstrate a role for the NAc in the incubation of methamphetamine craving and describe adaptations in synaptic transmission associated with this model. They establish that incubation of craving and associated CP-AMPAR plasticity occur much more rapidly during withdrawal from methamphetamine compared with cocaine. However, a common mGluR1-based therapeutic strategy may be helpful for recovering cocaine and methamphetamine addicts.
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20
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Hu L, Liu C, Dang M, Luo B, Guo Y, Wang H. Activation of 5-HT2A/2C receptors reduces the excitability of cultured cortical neurons. Neurosci Lett 2016; 632:124-9. [PMID: 27585751 DOI: 10.1016/j.neulet.2016.08.052] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Revised: 08/06/2016] [Accepted: 08/28/2016] [Indexed: 12/30/2022]
Abstract
The abundant forebrain serotonergic projections are believed to modulate the activities of cortical neurons. 5-HT2 receptor among multiple subtypes of serotonin receptors contributes to the modulation of excitability, synaptic transmissions and plasticity. In the present study, whole-cell patch-clamp recording was adopted to examine whether activation of 5-HT2A/2C receptors would have any impact on the excitability of cultured cortical neurons. We found that 2,5-Dimethoxy-4-iodoamphetamine (DOI), a selective 5-HT2A/2C receptor agonist, rapidly and reversibly depressed spontaneous action potentials mimicking the effect of serotonin. The decreased excitability was also observed for current-evoked firing. Additionally DOI increased neuronal input resistance. Hyperpolarization-activated cyclic nucleotide-gated cationic channels (HCN) did not account for the inhibition of spontaneous firing. The synaptic contribution was ruled out in that DOI augmented excitation and attenuated inhibition to actually favor an increase in the excitability. Our findings revealed that activation of 5-HT2A/2C receptors reduces neuronal excitability, which would deepen our understanding of serotonergic modulation of cortical activities.
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Affiliation(s)
- Lingli Hu
- Key Laboratory of Regenerative Biology, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, Guangdong, 510530, China; Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, Guangzhou, Guangdong, 510530, China
| | - Chunhua Liu
- Key Laboratory of Regenerative Biology, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, Guangdong, 510530, China; Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, Guangzhou, Guangdong, 510530, China
| | - Minyan Dang
- Key Laboratory of Regenerative Biology, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, Guangdong, 510530, China; Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, Guangzhou, Guangdong, 510530, China
| | - Bin Luo
- Department of Otolaryngology, Anhui Provincial Hospital Affiliated to Anhui Medical University, Hefei, 230001, China
| | - Yiping Guo
- Key Laboratory of Regenerative Biology, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, Guangdong, 510530, China; Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, Guangzhou, Guangdong, 510530, China.
| | - Haitao Wang
- Key Laboratory of Regenerative Biology, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, Guangdong, 510530, China; Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, Guangzhou, Guangdong, 510530, China; Department of Neurobiology and Biophysics, University of Science and Technology of China, Hefei, 230027, China.
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21
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Mishra D, Pena-Bravo JI, Leong KC, Lavin A, Reichel CM. Methamphetamine self-administration modulates glutamate neurophysiology. Brain Struct Funct 2016; 222:2031-2039. [PMID: 27709300 DOI: 10.1007/s00429-016-1322-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Accepted: 08/11/2016] [Indexed: 01/05/2023]
Abstract
World-wide methamphetamine (meth) use is increasing at a rapid rate; therefore, it has become increasingly important to understand the synaptic changes and neural mechanisms affected by drug exposure. In rodents, 6-h access to contingent meth results in an escalation of drug intake and impaired cognitive sequelae typically associated with changes within the corticostriatal circuitry. There is a dearth of knowledge regarding the underlying physiological changes within this circuit following meth self-administration. We assessed pre- and postsynaptic changes in glutamate transmission in the medial prefrontal cortex (mPFC) and nucleus accumbens (NAc) following daily 6-h meth self-administration. In the mPFC, meth caused postsynaptic adaptations in ionotropic glutamate receptor distribution and function, expressed as a decrease in AMPA/NMDA ratio. This change was driven by an increase in NMDA receptor currents and an increase in GluN2B surface expression. In the NAc, meth decreased the paired-pulse ratio and increased the frequency of spontaneous excitatory postsynaptic currents with no indication of postsynaptic changes. These changes in mPFC synapses and NAc activity begin to characterize the impact of meth on the corticostriatal circuitry.
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Affiliation(s)
- Devesh Mishra
- Department of Neurosciences, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC, 29425, USA
| | - Jose Ignacio Pena-Bravo
- Department of Neurosciences, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC, 29425, USA
| | - Kah-Chung Leong
- Department of Neurosciences, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC, 29425, USA
| | - Antonieta Lavin
- Department of Neurosciences, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC, 29425, USA
| | - Carmela M Reichel
- Department of Neurosciences, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC, 29425, USA.
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22
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Lipinska G, Timol R, Thomas KGF. The implications of sleep disruption for cognitive and affective processing in methamphetamine abuse. Med Hypotheses 2015; 85:914-21. [PMID: 26384529 DOI: 10.1016/j.mehy.2015.09.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 09/01/2015] [Accepted: 09/09/2015] [Indexed: 11/25/2022]
Abstract
Sleep is disrupted during active use of methamphetamine (MA), during withdrawal from the drug, and during abstinence from its use. However, relatively little is known about possible mediatory functions of disrupted sleep in the emergence, manifestation, and maintenance of cognitive and affective symptoms of MA abuse. We hypothesise that sleep functions as a mediator for stimulant drug effects. Specifically, we propose that objectively-measured sleep parameters can be used to explain some of the variability in the experience and presentation of memory deficits and emotion dysregulation in MA abusers. After describing how important healthy sleep is to unimpaired cognitive and affective functioning, we review literature describing how sleep is disrupted in MA abuse. Then, we provide a conceptual framework for our hypothesis by explaining the relationship between MA abuse, sleep disruption, memory deficits, emotion dysregulation, and changes in reward-related brain networks. We conclude by discussing implications of the hypothesis for research and treatment.
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Affiliation(s)
- Gosia Lipinska
- ACSENT Laboratory, Department of Psychology, University of Cape Town, South Africa
| | - Ridwana Timol
- ACSENT Laboratory, Department of Psychology, University of Cape Town, South Africa
| | - Kevin G F Thomas
- ACSENT Laboratory, Department of Psychology, University of Cape Town, South Africa.
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