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Grundey J, Amu R, Batsikadze G, Paulus W, Nitsche MA. Diverging effects of nicotine on motor learning performance: Improvement in deprived smokers and attenuation in non-smokers. Addict Behav 2017; 74:90-97. [PMID: 28600927 DOI: 10.1016/j.addbeh.2017.05.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 05/16/2017] [Accepted: 05/19/2017] [Indexed: 11/29/2022]
Abstract
Nicotine modulates cognition and neuroplasticity in smokers and non-smokers. A possible mechanism for its effect on learning and memory performance is its impact on long-term potentiation (LTP) and long-term depression (LTD). As neuroplasticity is closely connected to learning processes, we aimed to explore the effect of nicotine in healthy, young smokers and non-smokers on performance of the serial reaction time task (SRTT), a sequential motor learning paradigm. 20 nicotine-deprived smokers and 20 non-smokers participated in the study and were exposed to nicotine or placebo medication. Deprived smokers under placebo medication displayed reduced performance in terms of reaction time and error rates compared to the non-smoking group. After application of nicotine, performance in smokers improved while it deteriorated in non-smokers. These results indicate a restituting effect of nicotine in smokers in terms of cognitive parameters. This sheds further light on the proposed mechanism of nicotine on learning processes, which might be linked to the addictive component of nicotine, the probability of relapse and thus needs also be addressed in cessation treatment.
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Affiliation(s)
- J Grundey
- Department of Clinical Neurophysiology, Georg-August University Medical Center Göttingen, Robert-Koch Str. 40, 37075 Göttingen, Germany.
| | - R Amu
- Department of Clinical Neurophysiology, Georg-August University Medical Center Göttingen, Robert-Koch Str. 40, 37075 Göttingen, Germany
| | - G Batsikadze
- Department of Clinical Neurophysiology, Georg-August University Medical Center Göttingen, Robert-Koch Str. 40, 37075 Göttingen, Germany
| | - W Paulus
- Department of Clinical Neurophysiology, Georg-August University Medical Center Göttingen, Robert-Koch Str. 40, 37075 Göttingen, Germany
| | - M A Nitsche
- Department of Clinical Neurophysiology, Georg-August University Medical Center Göttingen, Robert-Koch Str. 40, 37075 Göttingen, Germany; Leibniz Research Center for Working Environment and Human Factors, Dortmund, Germany; Department of Neurology, BG University Hospital Bergmannsheil, Ruhr-University Bochum, Bochum, Germany
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102
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Dutra‐Tavares AC, Silva JO, Nunes‐Freitas AL, Guimarães VM, Araújo UC, Conceição EP, Moura EG, Lisboa PC, Filgueiras CC, Manhães AC, Abreu‐Villaça Y, Ribeiro‐Carvalho A. Maternal undernutrition during lactation alters nicotine reward and DOPAC/dopamine ratio in cerebral cortex in adolescent mice, but does not affect nicotine‐induced nAChRs upregulation. Int J Dev Neurosci 2017; 65:45-53. [DOI: 10.1016/j.ijdevneu.2017.10.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Revised: 10/15/2017] [Accepted: 10/16/2017] [Indexed: 12/19/2022] Open
Affiliation(s)
- Ana C. Dutra‐Tavares
- Departamento de Ciências FisiológicasInstituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de JaneiroAv. Prof. Manoel de Abreu 444, 5 andar – Vila IsabelRio de JaneiroRJ20550‐170Brazil
| | - Juliana O. Silva
- Departamento de Ciências FisiológicasInstituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de JaneiroAv. Prof. Manoel de Abreu 444, 5 andar – Vila IsabelRio de JaneiroRJ20550‐170Brazil
| | - André L. Nunes‐Freitas
- Departamento de Ciências FisiológicasInstituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de JaneiroAv. Prof. Manoel de Abreu 444, 5 andar – Vila IsabelRio de JaneiroRJ20550‐170Brazil
| | - Vinícius M.S. Guimarães
- Departamento de Ciências FisiológicasInstituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de JaneiroAv. Prof. Manoel de Abreu 444, 5 andar – Vila IsabelRio de JaneiroRJ20550‐170Brazil
| | - Ulisses C. Araújo
- Departamento de Ciências FisiológicasInstituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de JaneiroAv. Prof. Manoel de Abreu 444, 5 andar – Vila IsabelRio de JaneiroRJ20550‐170Brazil
| | - Ellen P.S. Conceição
- Departamento de Ciências FisiológicasInstituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de JaneiroAv. Prof. Manoel de Abreu 444, 5 andar – Vila IsabelRio de JaneiroRJ20550‐170Brazil
| | - Egberto G. Moura
- Departamento de Ciências FisiológicasInstituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de JaneiroAv. Prof. Manoel de Abreu 444, 5 andar – Vila IsabelRio de JaneiroRJ20550‐170Brazil
| | - Patrícia C. Lisboa
- Departamento de Ciências FisiológicasInstituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de JaneiroAv. Prof. Manoel de Abreu 444, 5 andar – Vila IsabelRio de JaneiroRJ20550‐170Brazil
| | - Cláudio C. Filgueiras
- Departamento de Ciências FisiológicasInstituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de JaneiroAv. Prof. Manoel de Abreu 444, 5 andar – Vila IsabelRio de JaneiroRJ20550‐170Brazil
| | - Alex C. Manhães
- Departamento de Ciências FisiológicasInstituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de JaneiroAv. Prof. Manoel de Abreu 444, 5 andar – Vila IsabelRio de JaneiroRJ20550‐170Brazil
| | - Yael Abreu‐Villaça
- Departamento de Ciências FisiológicasInstituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de JaneiroAv. Prof. Manoel de Abreu 444, 5 andar – Vila IsabelRio de JaneiroRJ20550‐170Brazil
| | - Anderson Ribeiro‐Carvalho
- Departamento de Ciências, Faculdade de Formação de Professores da Universidade do Estado do Rio de JaneiroRua Dr. Francisco Portela 1470 – PatronatoSão GonçaloRJ24435‐005Brazil
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103
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Hamidovic A. Targeting Mediators of Smoking Persistence with Intranasal Insulin. Front Pharmacol 2017; 8:706. [PMID: 29085297 PMCID: PMC5649209 DOI: 10.3389/fphar.2017.00706] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Accepted: 09/21/2017] [Indexed: 12/23/2022] Open
Abstract
Rapid-acting, non-irritating nasal treatment options for smoking cessation pharmacotherapy are lacking. The halt in development is due, in part, to difficulty in delivering compounds across the blood brain barrier. Recently, in both human and animal models, insulin was shown to be capable of being transported to the cerebrospinal fluid and various brain regions via the “nose-to-brain” pathway, which bypasses the blood brain barrier, but is not free of its own unique, though different from blood brain barrier, challenges. This review will first evaluate and critique pharmacokinetic and pharmacodynamic evidence of intranasal insulin (i.e., nose-to-brain) delivery. As intranasal insulin has been shown in clinical trials to be effective in reducing nicotine cravings, in the remainder of the review, hypothesis-generating literature for additional mediators (i.e., other than the already shown nicotine craving) of smoking persistence will be reviewed. In particular, weight gain, impulsive behavior, and anhedonia have been shown to contribute to the inability to quit smoking. For each of these, after reviewing how the mediator promotes smoking, intranasal insulin literature from animal and clinical models will be critiqued in assessing whether a hypothesis may be generated that intranasal insulin may alleviate it, thereby potentially contributing to a successful smoking cessation outcome.
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Affiliation(s)
- Ajna Hamidovic
- Pharmacy Practice, College of Pharmacy, University of Illinois at Chicago, Chicago, IL, United States
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104
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Wall TR, Henderson BJ, Voren G, Wageman CR, Deshpande P, Cohen BN, Grady SR, Marks MJ, Yohannes D, Kenny PJ, Bencherif M, Lester HA. TC299423, a Novel Agonist for Nicotinic Acetylcholine Receptors. Front Pharmacol 2017; 8:641. [PMID: 29033834 PMCID: PMC5626944 DOI: 10.3389/fphar.2017.00641] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2017] [Accepted: 08/29/2017] [Indexed: 01/11/2023] Open
Abstract
(E)-5-(Pyrimidin-5-yl)-1,2,3,4,7,8-hexahydroazocine (TC299423) is a novel agonist for nicotinic acetylcholine receptors (nAChRs). We examined its efficacy, affinity, and potency for α6β2∗ (α6β2-containing), α4β2∗, and α3β4∗ nAChRs, using [125I]-epibatidine binding, whole-cell patch-clamp recordings, synaptosomal 86Rb+ efflux, [3H]-dopamine release, and [3H]-acetylcholine release. TC299423 displayed an EC50 of 30–60 nM for α6β2∗ nAChRs in patch-clamp recordings and [3H]-dopamine release assays. Its potency for α6β2∗ in these assays was 2.5-fold greater than that for α4β2∗, and much greater than that for α3β4∗-mediated [3H]-acetylcholine release. We observed no major off-target binding on 70 diverse molecular targets. TC299423 was bioavailable after intraperitoneal or oral administration. Locomotor assays, measured with gain-of-function, mutant α6 (α6L9′S) nAChR mice, show that TC299423 elicits α6β2∗ nAChR-mediated responses at low doses. Conditioned place preference assays show that low-dose TC299423 also produces significant reward in α6L9′S mice, and modest reward in WT mice, through a mechanism that probably involves α6(non-α4)β2∗ nAChRs. However, TC299423 did not suppress nicotine self-administration in rats, indicating that it did not block nicotine reinforcement in the dosage range that was tested. In a hot-plate test, TC299423 evoked antinociceptive responses in mice similar to those of nicotine. TC299423 and nicotine similarly inhibited mouse marble burying as a measure of anxiolytic effects. Taken together, our data suggest that TC299423 will be a useful small-molecule agonist for future in vitro and in vivo studies of nAChR function and physiology.
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Affiliation(s)
- Teagan R Wall
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, United States
| | - Brandon J Henderson
- Department of Biomedical Sciences, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV, United States
| | - George Voren
- Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, United States
| | - Charles R Wageman
- Institute of Behavioral Genetics, University of Colorado, Boulder, Boulder, CO, United States
| | - Purnima Deshpande
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, United States
| | - Bruce N Cohen
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, United States
| | - Sharon R Grady
- Institute of Behavioral Genetics, University of Colorado, Boulder, Boulder, CO, United States
| | - Michael J Marks
- Institute of Behavioral Genetics, University of Colorado, Boulder, Boulder, CO, United States.,Department of Psychology and Neuroscience, University of Colorado, Boulder, Boulder, CO, United States
| | | | - Paul J Kenny
- Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, United States
| | | | - Henry A Lester
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, United States
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105
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Liu Q, Whiteaker P, Morley BJ, Shi FD, Lukas RJ. Distinctive Roles for α7*- and α9*-Nicotinic Acetylcholine Receptors in Inflammatory and Autoimmune Responses in the Murine Experimental Autoimmune Encephalomyelitis Model of Multiple Sclerosis. Front Cell Neurosci 2017; 11:287. [PMID: 29018331 PMCID: PMC5615207 DOI: 10.3389/fncel.2017.00287] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Accepted: 09/01/2017] [Indexed: 12/11/2022] Open
Abstract
Previous studies have demonstrated immunosuppressive and anti-inflammatory effects of nicotine, including in the experimental autoimmune encephalomyelitis (EAE) model in mice of some forms of multiple sclerosis (MS). Other studies using knock-out (KO) mice have implicated nicotinic acetylcholine (ACh) receptors containing α7, α9, or β2 subunits (α7*-, α9*- or β2*-nAChR) in different, disease-exacerbating or disease-ameliorating processes. These outcomes are in harmony with gene expression analyses showing nAChR subunit mRNA in many classes of immune system cell types. Consistent with influences on disease status, predictable effects of nAChR subunit (and subtype) KO, or of nicotine exposure, are seen on immune cell numbers and distribution and on cytokine levels or other markers of immunity, inflammation, demyelination, and axonal degradation. Providing support for our hypotheses about distinctive roles for nAChR subtypes in EAE, here we have used direct and adoptive EAE induction and a nAChR subunit gene double knock-out (DKO) strategy. Immune cell expression of nAChR α9 subunits as protein is demonstrated by immunostaining of isolated CD4+, CD8+, CD11b+ and CD11c+ cells from wild-type (WT) mice, but not in cells from nAChR α9 subunit KO animals. Nicotine exposure is protective against directly-induced EAE in WT or α7/α9 DKO animals relative to effects seen in WT/vehicle-treated mice, but, remarkably, EAE is exacerbated in vehicle-treated α7/α9 DKO mice. Brain lesion volume and intra-cranial inflammatory activity similarly are higher in DKO/vehicle than in WT/vehicle-treated animals, although nicotine’s protective effects are seen in each instance. By contrast, in adoptive transfer studies, disease severity is attenuated and disease onset is delayed in recipients of splenocytes from WT animals treated with nicotine rather than with vehicle. Moreover, protection as seen in nicotine-treated WT animals is the same in recipients of splenocytes from nAChR α7/α9 DKO mice irrespective of their exposure to nicotine or vehicle. When combined with previous observations, these findings are consistent with disease exacerbation (or even induction) being mediated at least in part via α9*-nAChR in peripheral immune cells. They also suggest protective roles of central nervous system (CNS) α7*-nAChR. The results suggest that both α7*- and α9*-nAChR are potential targets of therapeutic ligands to modulate inflammation and autoimmunity.
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Affiliation(s)
- Qiang Liu
- Division of Neurobiology, Barrow Neurological InstitutePhoenix, AZ, United States
| | - Paul Whiteaker
- Division of Neurobiology, Barrow Neurological InstitutePhoenix, AZ, United States
| | | | - Fu-Dong Shi
- Division of Neurobiology, Barrow Neurological InstitutePhoenix, AZ, United States
| | - Ronald J Lukas
- Division of Neurobiology, Barrow Neurological InstitutePhoenix, AZ, United States
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106
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Haam J, Yakel JL. Cholinergic modulation of the hippocampal region and memory function. J Neurochem 2017; 142 Suppl 2:111-121. [PMID: 28791706 DOI: 10.1111/jnc.14052] [Citation(s) in RCA: 234] [Impact Index Per Article: 33.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 04/17/2017] [Accepted: 04/18/2017] [Indexed: 12/20/2022]
Abstract
Acetylcholine (ACh) plays an important role in memory function and has been implicated in aging-related dementia, in which the impairment of hippocampus-dependent learning strongly manifests. Cholinergic neurons densely innervate the hippocampus, mediating the formation of episodic as well as semantic memory. Here, we will review recent findings on acetylcholine's modulation of memory function, with a particular focus on hippocampus-dependent learning, and the circuits involved. In addition, we will discuss the complexity of ACh actions in memory function to better understand the physiological role of ACh in memory. This is an article for the special issue XVth International Symposium on Cholinergic Mechanisms.
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Affiliation(s)
- Juhee Haam
- Neurobiology Laboratory, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC, USA
| | - Jerrel L Yakel
- Neurobiology Laboratory, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC, USA
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107
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Rezvani AH, Slade S, Wells C, Yenugonda VM, Liu Y, Brown ML, Xiao Y, Kellar KJ, Levin ED. Differential efficacies of the nicotinic α4β2 desensitizing agents in reducing nicotine self-administration in female rats. Psychopharmacology (Berl) 2017; 234:2517-2523. [PMID: 28555315 DOI: 10.1007/s00213-017-4641-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Accepted: 04/26/2017] [Indexed: 01/18/2023]
Abstract
RATIONALE AND OBJECTIVES Desensitization of neuronal nicotinic acetylcholine receptors holds promise as an effective treatment of tobacco addiction. Previously, we found that sazetidine-A (Saz-A), which selectively desensitizes α4β2 nicotinic receptors, significantly decreased intravenous (IV) nicotine self-administration (SA) in rats with an effective dose of 3 mg/kg in acute and repeated injection studies. We also found that chronic infusions of Saz-A at doses of 2 and 6 mg/kg/day significantly reduced nicotine SA in rats. In continuing studies, we have characterized other Saz-A analogs, YL-2-203 and VMY-2-95, to determine their efficacies in reducing nicotine SA in rats. METHODS Young adult female Sprague-Dawley rats were fitted with IV catheters and were trained for nicotine SA (0.03 mg/kg/infusion) on a fixed ratio 1 schedule for ten sessions. The same rats were also implanted subcutaneously with osmotic minipumps to continually deliver 2 or 6 mg/kg body weight YL-2-203, VMY-2-95, or saline for four consecutive weeks. RESULTS Chronic administration of VMY-2-95 at doses of 2 and 6 mg/kg/day caused significant (p < 0.01) decreases in nicotine SA over the 2 weeks of continued nicotine SA and for the 1-week period of resumed access after a week of enforced abstinence, whereas chronic administration of YL-2-203 at the same doses was not found to be effective. CONCLUSIONS These studies, together with our previous studies of Saz-A, revealed a spectrum of efficacies for these α4β2 nicotinic receptor desensitizing agents and provide a path forward for the most effective compounds to be further developed as possible aids to smoking cessation.
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Affiliation(s)
- Amir H Rezvani
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Box 104790, Durham, NC, 27710, USA.
| | - Susan Slade
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Box 104790, Durham, NC, 27710, USA
| | - Corinne Wells
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Box 104790, Durham, NC, 27710, USA
| | - Venkata M Yenugonda
- Drug Discovery Program, Georgetown University School of Medicine, Washington, DC, 20057, USA
| | - Yong Liu
- Drug Discovery Program, Georgetown University School of Medicine, Washington, DC, 20057, USA
| | - Milton L Brown
- Drug Discovery Program, Georgetown University School of Medicine, Washington, DC, 20057, USA
| | - Yingxian Xiao
- Department of Pharmacology and Physiology, Georgetown University School of Medicine, Washington, DC, 20057, USA
| | - Kenneth J Kellar
- Drug Discovery Program, Georgetown University School of Medicine, Washington, DC, 20057, USA
| | - Edward D Levin
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Box 104790, Durham, NC, 27710, USA
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108
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Nicotine and networks: Potential for enhancement of mood and cognition in late-life depression. Neurosci Biobehav Rev 2017; 84:289-298. [PMID: 28859996 DOI: 10.1016/j.neubiorev.2017.08.018] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 07/11/2017] [Accepted: 08/25/2017] [Indexed: 11/23/2022]
Abstract
Late-life depression is characterized by both lower mood and poor cognitive performance, symptoms that often do not fully respond to current antidepressant medications. Nicotinic acetylcholine receptor (nAChR) agonists such as nicotine may serve as a novel therapeutic approach for this population. Both preclinical and preliminary clinical studies suggest that nAChR agonists can improve depressive behavior in animal models and improve mood in depressed individuals. Substantial literature also supports that nAChR agonists benefit cognitive performance, particularly in older populations. These potential benefits may be mediated by the effects of nAChR stimulation on neural network function and connectivity. Functional neuroimaging studies detail effects of nAChR agonists on the default mode network, central-executive network, and salience network that may oppose or reverse network changes seen in depression. We propose that, given the existent literature and the clinical presentation of late-life depression, nicotine or other nAChR agonists may have unique therapeutic benefits in this population and that clinical trials examining nicotine effects on mood, cognition, and network dynamics in late-life depression are justified.
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109
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Brumberg J, Küsters S, Al-Momani E, Marotta G, Cosgrove KP, van Dyck CH, Herrmann K, Homola GA, Pezzoli G, Buck AK, Volkmann J, Samnick S, Isaias IU. Cholinergic activity and levodopa-induced dyskinesia: a multitracer molecular imaging study. Ann Clin Transl Neurol 2017; 4:632-639. [PMID: 28904985 PMCID: PMC5590520 DOI: 10.1002/acn3.438] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2017] [Revised: 06/02/2017] [Accepted: 06/19/2017] [Indexed: 12/23/2022] Open
Abstract
Objective To investigate the association between levodopa‐induced dyskinesias and striatal cholinergic activity in patients with Parkinson's disease. Methods This study included 13 Parkinson's disease patients with peak‐of‐dose levodopa‐induced dyskinesias, 12 nondyskinetic patients, and 12 healthy controls. Participants underwent 5‐[123I]iodo‐3‐[2(S)‐2‐azetidinylmethoxy]pyridine single‐photon emission computed tomography, a marker of nicotinic acetylcholine receptors, [123I]N‐ω‐fluoropropyl‐2β‐carbomethoxy‐3β‐(4‐iodophenyl)nortropane single‐photon emission computed tomography, to measure dopamine reuptake transporter density and 2‐[18F]fluoro‐2‐deoxyglucose positron emission tomography to assess regional cerebral metabolic activity. Striatal binding potentials, uptake values at basal ganglia structures, and correlations with clinical variables were analyzed. Results Density of nicotinic acetylcholine receptors in the caudate nucleus of dyskinetic subjects was similar to that of healthy controls and significantly higher to that of nondyskinetic patients, in particular, contralaterally to the clinically most affected side. Interpretation Our findings support the hypothesis that the expression of dyskinesia may be related to cholinergic neuronal excitability in a dopaminergic‐depleted striatum. Cholinergic signaling would play a role in maintaining striatal dopaminergic responsiveness, possibly defining disease phenotype and progression.
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Affiliation(s)
- Joachim Brumberg
- Department of Nuclear Medicine University Hospital Würzburg and Julius-Maximilians-University Würzburg Germany
| | - Sebastian Küsters
- Department of Neurology University Hospital Würzburg and Julius-Maximilians-University Würzburg Germany
| | - Ehab Al-Momani
- Department of Nuclear Medicine University Hospital Würzburg and Julius-Maximilians-University Würzburg Germany
| | - Giorgio Marotta
- Department of Nuclear Medicine Fondazione IRCCS Ca' Granda - Ospedale Maggiore Policlinico Milan Italy
| | - Kelly P Cosgrove
- Department of Psychiatry Yale University School of Medicine New Haven Connecticut
| | | | - Ken Herrmann
- Department of Nuclear Medicine University Hospital Würzburg and Julius-Maximilians-University Würzburg Germany.,Department of Nuclear Medicine University Hospital Essen Essen Germany
| | - György A Homola
- Department of Neuroradiology University Hospital Würzburg and Julius-Maximilians-University Würzburg Germany
| | | | - Andreas K Buck
- Department of Nuclear Medicine University Hospital Würzburg and Julius-Maximilians-University Würzburg Germany
| | - Jens Volkmann
- Department of Neurology University Hospital Würzburg and Julius-Maximilians-University Würzburg Germany
| | - Samuel Samnick
- Department of Nuclear Medicine University Hospital Würzburg and Julius-Maximilians-University Würzburg Germany
| | - Ioannis U Isaias
- Department of Neurology University Hospital Würzburg and Julius-Maximilians-University Würzburg Germany
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110
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Björkman F, Edin F, Mattsson CM, Larsen F, Ekblom B. Regular moist snuff dipping does not affect endurance exercise performance. PLoS One 2017; 12:e0181228. [PMID: 28704507 PMCID: PMC5509427 DOI: 10.1371/journal.pone.0181228] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2016] [Accepted: 06/28/2017] [Indexed: 11/19/2022] Open
Abstract
Physiological and medical effects of snuff have previously been obtained either in cross-sectional studies or after snuff administration to non-tobacco users. The effects of snuff cessation after several years of daily use are unknown. 24 participants with >2 years of daily snuff-use were tested before and after >6 weeks snuff cessation (SCG). A control group (CO) of 11 snuff users kept their normal habits. Resting heart rate (HR) and blood pressure (BP) were significantly lower in SCG after snuff cessation, and body mass was increased by 1.4 ± 1.7 kg. Total cholesterol increased from 4.12 ± 0.54 (95% CI 3.89–4.35) to 4.46 ± 0.70 (95% CI 4.16–4.75) mM L–1 in SCG, due to increased LDL, and this change was significantly different from CO. Resting values of HDL, C-reactive protein, and free fatty acids (FFA) remained unchanged in both groups. In SCG group, both HR and BP were reduced during a four-stage incremental cycling test (from 50 to 80% of VO2max) and a prolonged cycling test (60 min at 50% of VO2max). Oxygen uptake (VO2), respiratory exchange ratio, blood lactate (bLa) and blood glucose (bGlu) concentration, and rate of perceived exertion (RPE) were unchanged. In CO group, all measurements were unchanged. During the prolonged cycling test, FFA was reduced, but with no significant difference between groups. During the maximal treadmill running test peak values of VO2, pulmonary ventilation (VE), time to exhaustion and bLa were unchanged in both groups. In conclusion, endurance exercise performance (VO2max and maximal endurance time) does not seem to be affected by prolonged snuff use, while effects on cardiovascular risk factors are contradictory. HR and BP during rest and submaximal exercise are reduced after cessation of regular use of snuff. Evidently, the long-time adrenergic stress on circulation is reversible.
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Affiliation(s)
- Frida Björkman
- Åstrand Laboratory of Work Physiology, The Swedish School of Sport and Health Sciences, Stockholm, Sweden
| | - Fredrik Edin
- Department of Food and Nutrition, and Sport Science, University of Gothenburg, Gothenburg, Sweden
| | - C Mikael Mattsson
- Åstrand Laboratory of Work Physiology, The Swedish School of Sport and Health Sciences, Stockholm, Sweden
- Department of Physiology and Pharmacology, Karolinska Institute, Stockholm, Sweden
| | - Filip Larsen
- Åstrand Laboratory of Work Physiology, The Swedish School of Sport and Health Sciences, Stockholm, Sweden
- Department of Physiology and Pharmacology, Karolinska Institute, Stockholm, Sweden
| | - Björn Ekblom
- Åstrand Laboratory of Work Physiology, The Swedish School of Sport and Health Sciences, Stockholm, Sweden
- Department of Physiology and Pharmacology, Karolinska Institute, Stockholm, Sweden
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111
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Druyan A, Atias D, Ketko I, Cohen-Sivan Y, Heled Y. The effects of smoking and nicotine ingestion on exercise heat tolerance. J Basic Clin Physiol Pharmacol 2017; 28:167-170. [PMID: 27831921 DOI: 10.1515/jbcpp-2016-0065] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 08/08/2016] [Indexed: 11/15/2022]
Abstract
BACKGROUND Smoking has a thermogenic effect and is associated with low physical performance. Nevertheless, a direct, quantitative effect of acute smoking on exercise heat tolerance has not been reported. METHODS Sixteen healthy young male volunteers, eight cigarette smokers, and eight non-smokers participated in the study. All subjects performed a maximal oxygen consumption test (VO2max) and a standardized heat tolerance test (HTT) after at least 12 h without smoking under the following conditions: no nicotine exposure, 10 min after nicotine exposure (2 mg nicotine lozenge), and 10 min after smoking two cigarettes (0.8 mg nicotine in each cigarette, smokers only). RESULTS There was no significant effect of nicotine exposure on physiological performance and heat tolerance in the non-smokers group. In the smokers group, cigarette smoking, but not nicotine ingestion, resulted with higher heart rate (by 9±9 bpm) at the end of the HTT (p<0.05). Moreover, both smoking and nicotine ingestion increased smokers' rectal temperature at the end of the HTT (by 0.24±0.16°C and 0.21±0.26°C, respectively, p<0.05) and were associated with higher sweat rate during the HTT (by 0.08±0.07 g/h and 0.06±0.08 g/h, respectively, p<0.05). Heart rate variability (HRV) analysis also revealed a higher LF/HF (low frequency/high frequency) ratio after exposure to nicotine and smoking in the smokers group compared with no exposure (2.13±2.57 and 2.48±2.76, respectively, p<0.05), indicating a higher sympathetic tone. CONCLUSIONS According to this preliminary study, cigarette smoking and nicotine ingestion increase the physiological strain during a HTT in smokers. Acute smoking may, therefore, increase heat intolerance and the risk to heat injuries.
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α6β2 subunit containing nicotinic acetylcholine receptors exert opposing actions on rapid dopamine signaling in the nucleus accumbens of rats with high-versus low-response to novelty. Neuropharmacology 2017; 126:281-291. [PMID: 28666811 DOI: 10.1016/j.neuropharm.2017.06.028] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Revised: 06/07/2017] [Accepted: 06/26/2017] [Indexed: 11/22/2022]
Abstract
Determining neurobiological factors that contribute to individual variance in drug addiction vulnerability allows for identification of at-risk populations, use of preventative measures and personalized medicine in the treatment of substance use disorders. Rodents that exhibit high locomotor activity when exploring an inescapable novel environment (high-responder; HR) are more susceptible to the reinforcing effects of many abused compounds, including nicotine, as compared to animals that exhibit low locomotor activity (low-responder; LR). Given that nicotinic acetylcholine receptor (nAChR) modulation of reward-related dopamine signaling at accumbal dopamine terminals is critical for the acquisition of drug self-administration, we hypothesized that nAChR modulation of dopamine release would be predicted by an animal's novelty response. Using voltammetry in the nucleus accumbens core of rats, we found that nicotine produced opposite effects in HR and LR animals on stimulation frequencies that model phasic dopamine release, whereby release magnitude was either augmented or attenuated, respectively. Further, nicotine suppressed dopamine release elected by stimulation frequencies that model tonic release in LR animals, but had no effect in HR animals. The differential effects of nicotine were likely due to desensitization of nAChRs, since the nAChR antagonists mecamylamine (non-selective, 2 μM), dihydro-beta-erythroidine (β2-selective, 500 nM), and α-conotoxin MII [H9A; L15A] (α6-selective, 100 nM) produced effects similar to nicotine. Moreover, dihydro-beta-erythroidine failed to show differential effects in HR and LR rats when applied after α-conotoxin MII [H9A; L15A], suggesting a critical role of α6β2 compared non α6-containing nAChRs in the differential effects observed in these phenotypes. These results delineate a potential mechanism for individual variability in behavioral sensitivity to nicotine.
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Chronic Nicotine Mitigates Aberrant Inhibitory Motor Learning Induced by Motor Experience under Dopamine Deficiency. J Neurosci 2017; 36:5228-40. [PMID: 27170121 DOI: 10.1523/jneurosci.2754-15.2016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Accepted: 03/26/2016] [Indexed: 11/21/2022] Open
Abstract
UNLABELLED Although dopamine receptor antagonism has long been associated with impairments in motor performance, more recent studies have shown that dopamine D2 receptor (D2R) antagonism, paired with a motor task, not only impairs motor performance concomitant with the pharmacodynamics of the drug, but also impairs future motor performance once antagonism has been relieved. We have termed this phenomenon "aberrant motor learning" and have suggested that it may contribute to motor symptoms in movement disorders such as Parkinson's disease (PD). Here, we show that chronic nicotine (cNIC), but not acute nicotine, treatment mitigates the acquisition of D2R-antagonist-induced aberrant motor learning in mice. Although cNIC mitigates D2R-mediated aberrant motor learning, cNIC has no effect on D1R-mediated motor learning. β2-containing nicotinic receptors in dopamine neurons likely mediate the protective effect of cNIC against aberrant motor learning, because selective deletion of β2 nicotinic subunits in dopamine neurons reduced D2R-mediated aberrant motor learning. Finally, both cNIC treatment and β2 subunit deletion blunted postsynaptic responses to D2R antagonism. These results suggest that a chronic decrease in function or a downregulation of β2-containing nicotinic receptors protects the striatal network against aberrant plasticity and aberrant motor learning induced by motor experience under dopamine deficiency. SIGNIFICANCE STATEMENT Increasingly, aberrant plasticity and aberrant learning are recognized as contributing to the development and progression of movement disorders. Here, we show that chronic nicotine (cNIC) treatment or specific deletion of β2 nicotinic receptor subunits in dopamine neurons mitigates aberrant motor learning induced by dopamine D2 receptor (D2R) blockade in mice. Moreover, both manipulations also reduced striatal dopamine release and blunt postsynaptic responses to D2R antagonists. These results suggest that chronic downregulation of function and/or receptor expression of β2-containing nicotinic receptors alters presynaptic and postsynaptic striatal signaling to protect against aberrant motor learning. Moreover, these results suggest that cNIC treatment may alleviate motor symptoms and/or delay the deterioration of motor function in movement disorders by blocking aberrant motor learning.
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Compromised neuroplasticity in cigarette smokers under nicotine withdrawal is restituted by the nicotinic α 4β 2-receptor partial agonist varenicline. Sci Rep 2017; 7:1387. [PMID: 28469204 PMCID: PMC5431184 DOI: 10.1038/s41598-017-01428-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Accepted: 03/29/2017] [Indexed: 11/08/2022] Open
Abstract
Nicotine modulates neuroplasticity and improves cognitive functions in animals and humans. In the brain of smoking individuals, calcium-dependent plasticity induced by non-invasive brain stimulation methods such as transcranial direct current stimulation (tDCS) and paired associative stimulation (PAS) is impaired by nicotine withdrawal, but partially re-established after nicotine re-administration. In order to investigate the underlying mechanism further, we tested the impact of the α4β2-nicotinic receptor partial agonist varenicline on focal and non-focal plasticity in smokers during nicotine withdrawal, induced by PAS and tDCS, respectively. We administered low (0.3 mg) and high (1.0 mg) single doses of varenicline or placebo medication before stimulation over the left motor cortex of 20 healthy smokers under nicotine withdrawal. Motor cortex excitability was monitored by single-pulse transcranial magnetic stimulation-induced motor evoked potential amplitudes for 36 hours after plasticity induction. Stimulation-induced plasticity was absent under placebo medication, whereas it was present in all conditions under high dose. Low dose restituted only tDCS-induced non-focal plasticity, producing no significant impact on focal plasticity. High dose varenicline also prolonged inhibitory plasticity. These results are comparable to the impact of nicotine on withdrawal-related impaired plasticity in smokers and suggest that α4β2 nicotinic receptors are relevantly involved in plasticity deficits and restitution in smokers.
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Yeh TC, Wang SC, Chang YT, Yeh CB. Predictors of Nicotine Dependence in Adolescents: Symptoms of Bipolar Disorder and Attention-Deficit/Hyperactivity Disorder. J Child Adolesc Psychopharmacol 2017; 27:366-373. [PMID: 28146638 DOI: 10.1089/cap.2016.0099] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
OBJECTIVE Bipolar disorder (BD) and attention-deficit/hyperactivity disorder (ADHD) have been associated with the use of cigarettes, but little is known about the impact of the subthreshold symptoms of BD or ADHD on the course of nicotine dependence. Identifying the links is essential for elucidating the pathway and supporting the development of nicotine prevention strategies for adolescents. METHODS Participants (n = 3322) aged 15-17 years completed the Chinese version of the ADHD Self-Report Scale and the Mood Disorder Questionnaire. The modified Fagerström Tolerance Questionnaire was completed to measure their nicotine use or dependence. Mediation analyses were performed to explore the relationship of two predictors. RESULTS The prevalence rates of cigarette smoking and nicotine dependence in this study were 14.4% and 2.3%, respectively. Male gender (odds ratio [OR] 2.30; 95% confidence interval [CI] 1.60-3.30), subclinical symptoms of ADHD (OR 1.34; 95% CI 1.04-1.71), clinical symptoms of ADHD (OR 1.69; 95% CI 1.08-2.66), and symptoms of BD (OR 1.59; 95% CI1.09 to 2.32) were associated with nicotine use. Male gender (OR 4.60; 95% CI 1.41-14.98) and symptoms of BD (OR 6.14; 95% CI 3.37-11.18), but not symptoms of ADHD, were associated with nicotine dependence. In mediation analyses, we found that the effect of ADHD symptoms was no longer significant after controlling for symptoms of BD, and the mediation ratio (PM) was 0.39. CONCLUSIONS Our findings suggest that mood disturbances other than symptoms of ADHD are more likely to be a key predictor of nicotine dependence among adolescents. The conclusions may improve our understanding of the course of nicotine dependence and help to promote potential health policy for nicotine control among youths.
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Affiliation(s)
- Ta-Chuan Yeh
- 1 Department of Psychiatry, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, Republic of China
| | - Sheng-Chiang Wang
- 2 Department of Psychiatry, Tri-Service General Hospital Song-Shan Branch, National Defense Medical Center, Taipei, Taiwan, Republic of China
| | - Yu-Tien Chang
- 3 School of Public Health, National Defense Medical Center , Taipei, Taiwan, Republic of China
| | - Chin-Bin Yeh
- 1 Department of Psychiatry, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, Republic of China
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Stringfield SJ, Palmatier MI, Boettiger CA, Robinson DL. Orbitofrontal participation in sign- and goal-tracking conditioned responses: Effects of nicotine. Neuropharmacology 2017; 116:208-223. [PMID: 28012948 PMCID: PMC5385154 DOI: 10.1016/j.neuropharm.2016.12.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Revised: 11/15/2016] [Accepted: 12/21/2016] [Indexed: 11/22/2022]
Abstract
Pavlovian conditioned stimuli can acquire incentive motivational properties, and this phenomenon can be measured in animals using Pavlovian conditioned approach behavior. Drugs of abuse can influence the expression of this behavior, and nicotine in particular exhibits incentive amplifying effects. Both conditioned approach behavior and drug abuse rely on overlapping corticolimbic circuitry. We hypothesize that the orbitofrontal cortex (OFC) regulates conditioned approach, and that one site of nicotine action is in the OFC where it reduces cortical output. To test this, we repeatedly exposed rats to 0.4 mg/kg nicotine (s.c.) during training and then pharmacologically inactivated the lateral OFC or performed in vivo electrophysiological recordings of lateral OFC neurons in the presence or absence of nicotine. In Experiment 1, animals were trained in a Pavlovian conditioning paradigm and behavior was evaluated after inactivation of the OFC by microinfusion of the GABA agonists baclofen and muscimol. In Experiment 2, we monitored phasic firing of OFC neurons during Pavlovian conditioning sessions. Nicotine reliably enhanced conditioned responding to the conditioned cue, and inactivation of the OFC reduced conditioned responding, especially the sign-tracking response. OFC neurons exhibited phasic excitations to cue presentation and during goal tracking, and nicotine acutely blunted this phasic neuronal firing. When nicotine was withheld, both conditioned responding and phasic firing in the OFC returned to the level of controls. These results suggest that the OFC is recruited for the expression of conditioned responses, and that nicotine acutely influences this behavior by reducing phasic firing in the OFC.
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Affiliation(s)
- Sierra J Stringfield
- Bowles Center for Alcohol Studies, University of North Carolina, Chapel Hill, NC, USA; Neurobiology Curriculum, University of North Carolina, Chapel Hill, NC, USA
| | - Matthew I Palmatier
- Department of Psychology, East Tennessee State University, Johnson City, TN, USA
| | - Charlotte A Boettiger
- Bowles Center for Alcohol Studies, University of North Carolina, Chapel Hill, NC, USA; Neurobiology Curriculum, University of North Carolina, Chapel Hill, NC, USA; Department of Psychology and Neuroscience, University of North Carolina, Chapel Hill, NC, USA
| | - Donita L Robinson
- Bowles Center for Alcohol Studies, University of North Carolina, Chapel Hill, NC, USA; Neurobiology Curriculum, University of North Carolina, Chapel Hill, NC, USA; Department of Psychiatry, University of North Carolina, Chapel Hill, NC, USA.
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Wang J, Lindstrom J. Orthosteric and allosteric potentiation of heteromeric neuronal nicotinic acetylcholine receptors. Br J Pharmacol 2017; 175:1805-1821. [PMID: 28199738 DOI: 10.1111/bph.13745] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Revised: 01/30/2017] [Accepted: 02/06/2017] [Indexed: 12/16/2022] Open
Abstract
Heteromeric nicotinic ACh receptors (nAChRs) were thought to have two orthodox agonist-binding sites at two α/β subunit interfaces. Highly selective ligands are hard to develop by targeting orthodox agonist sites because of high sequence similarity of this binding pocket among different subunits. Recently, unorthodox ACh-binding sites have been discovered at some α/α and β/α subunit interfaces, such as α4/α4, α5/α4 and β3/α4. Targeting unorthodox sites may yield subtype-selective ligands, such as those for (α4β2)2 α5, (α4β2)2 β3 and (α6β2)2 β3 nAChRs. The unorthodox sites have unique pharmacology. Agonist binding at one unorthodox site is not sufficient to activate nAChRs, but it increases activation from the orthodox sites. NS9283, a selective agonist for the unorthodox α4/α4 site, was initially thought to be a positive allosteric modulator (PAM). NS9283 activates nAChRs with three engineered α4/α4 sites. PAMs, on the other hand, act at allosteric sites where ACh cannot bind. Known PAM sites include the ACh-homologous non-canonical site (e.g. morantel at β/α), the C-terminus (e.g. Br-PBTC and 17β-estradiol), a transmembrane domain (e.g. LY2087101) or extracellular and transmembrane domain interfaces (e.g. NS206). Some of these PAMs, such as Br-PBTC and 17β-estradiol, require only one subunit to potentiate activation of nAChRs. In this review, we will discuss differences between activation from orthosteric and allosteric sites, their selective ligands and clinical implications. These studies have advanced understanding of the structure, assembly and pharmacology of heteromeric neuronal nAChRs. LINKED ARTICLES This article is part of a themed section on Nicotinic Acetylcholine Receptors. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v175.11/issuetoc.
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Affiliation(s)
- Jingyi Wang
- Division of Pharmacology and Toxicology, College of Pharmacy, The University of Texas at Austin, Austin, TX, USA
| | - Jon Lindstrom
- Department of Neuroscience, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
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Ray C, Soderblom EJ, Bai Y, Carroll FI, Caron MG, Barak LS. Probing the Allosteric Role of the α5 Subunit of α3β4α5 Nicotinic Acetylcholine Receptors by Functionally Selective Modulators and Ligands. ACS Chem Biol 2017; 12:702-714. [PMID: 28045487 DOI: 10.1021/acschembio.6b01117] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Nicotinic acetylcholine receptors regulate the nicotine dependence encountered with cigarette smoking, and this has stimulated a search for drugs binding the responsible receptor subtypes. Studies link a gene cluster encoding for α3β4α5-D398N nicotinic acetylcholine receptors to lung cancer risk as well as link a second mutation in this cluster to an increased risk for nicotine dependence. However, there are currently no recognized drugs for discriminating α3β4α5 signaling. In this study, we describe the development of homogeneous HEK-293 cell clones of α3β4 and α3β4α5 receptors appropriate for drug screening and characterizing biochemical and pharmacological properties of incorporated α5 subunits. Clones were assessed for plasma membrane expression of the individual receptor subunits by mass spectrometry and immunochemistry, and their calcium flux was measured in the presence of a library of kinase inhibitors and a focused library of acetylcholine receptor ligands. We demonstrated an incorporation of two α3 subunits in approximately 98% of plasma membrane receptor pentamers, indicating a 2/3 subunit expression ratio of α3 to β4 alone or to coexpressed β4 and α5. With prolonged nicotine exposure, the plasma membrane expression of receptors with and without incorporated α5 increased. Whereas α5 subunit expression decreased the cell calcium response to nicotine and reduced plasma membrane receptor number, it partially protected receptors from nicotine mediated desensitization. Hit compounds from both libraries suggest the α5 and α5-D398N subunits allosterically modify the behavior of nicotine at the parent α3β4 nicotinic acetylcholine receptor. These studies identify pharmacological tools from two distinct classes of drugs, antagonists and modifiers that are α5 and α5-D398N subtype selective that provide a means to characterize the role of the CHRNA5/A3/B4 gene cluster in smoking and cancer.
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Affiliation(s)
| | | | | | - F. Ivy Carroll
- Departments
of Pharmacology and Toxicology, RTI International, 3040 E. Cornwallis Road, Durham, North Carolina 27709, United States
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Yuille MB, Olmstead CK, Wells AK, Hahn B. A test of the cognitive-enhancing potential of low-dose mecamylamine in healthy non-smokers. Psychopharmacology (Berl) 2017; 234:109-116. [PMID: 27678550 PMCID: PMC5209795 DOI: 10.1007/s00213-016-4443-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Accepted: 09/16/2016] [Indexed: 11/30/2022]
Abstract
RATIONALE The beneficial effects of nicotinic acetylcholine receptor (nAChR) agonists on cognitive performance have been widely shown. Paradoxically, recent preclinical studies employing extremely low doses of nAChR antagonists have also found cognitive enhancement, perhaps pointing to a novel treatment mechanism for cognitive deficits. OBJECTIVES The aim was to test whether low doses of the nAChR antagonist mecamylamine would benefit performance in human volunteers. METHODS The study employed a double-blind within-subject design. Over four separate days, healthy adult non-smokers (n = 23) were tested with placebo and three trace doses of mecamylamine (0.25-1 mg, p.o.), adjusted for body weight. Participants performed three computerized tasks: a task of spatial selective attention and stimulus detection, the rapid visual information processing task (RVIPT) taxing sustained attention and working memory, and a change detection short-term memory task. Subjective state and vital signs were assessed repeatedly. RESULTS Mecamylamine did not improve performance in any of the tasks. Any trends that were observed instead pointed toward performance impairment. Mecamylamine also had no effects on subjective state or vital signs. CONCLUSIONS The present results do not support the hypothesized cognitive-enhancing potential of low doses of mecamylamine. Contrary to preclinical reports, these findings speak against low-dose nAChR antagonism as a novel avenue for treating cognitive deficits.
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Affiliation(s)
| | | | | | - Britta Hahn
- Maryland Psychiatric Research Center, University of Maryland School of Medicine, P.O. Box 21247, Baltimore, MD, 21228, USA.
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120
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Cunningham CS, Moerke MJ, Javors MA, Carroll FI, McMahon LR. Attenuated nicotine-like effects of varenicline but not other nicotinic ACh receptor agonists in monkeys receiving nicotine daily. Br J Pharmacol 2016; 173:3454-3466. [PMID: 27667659 PMCID: PMC5120155 DOI: 10.1111/bph.13635] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Revised: 09/13/2016] [Accepted: 09/18/2016] [Indexed: 01/23/2023] Open
Abstract
BACKGROUND AND PURPOSE Chronic treatment can differentially impact the effects of pharmacologically related drugs that differ in receptor selectivity and efficacy. EXPERIMENTAL APPROACH The impact of daily nicotine treatment on the effects of nicotinic ACh receptor (nAChR) agonists was examined in two groups of rhesus monkeys discriminating nicotine (1.78 mg·kg-1 base weight) from saline. One group received additional nicotine treatment post-session (1.78 mg·kg-1 administered five times daily, each dose 2 h apart; i.e. Daily group), and the second group did not (Intermittent group). KEY RESULTS Daily repeated nicotine treatment produced a time-related increase in saliva cotinine. There was no significant difference in the ED50 values of the nicotine discriminative stimulus between the Daily and Intermittent group. Mecamylamine antagonized the effects of nicotine, whereas dihydro-β-erythroidine did not. Midazolam produced 0% nicotine-lever responding. The nAChR agonists epibatidine, RTI-36, cytisine and varenicline produced >96% nicotine-lever responding in the Intermittent group. The respective maximum effects in the Daily group were 100, 72, 59 and 28%, which shows that the ability of varenicline to produce nicotine-like responding was selectively decreased in the Daily as compared with the Intermittent group. When combined with nicotine, both varenicline and cytisine increased the potency of nicotine to produce discriminative stimulus effects. CONCLUSION AND IMPLICATIONS Nicotine treatment has a greater impact on the sensitivity to the effects of varenicline as compared with some other nAChR agonists. Collectively, these results strongly suggest that varenicline differs from nicotine in its selectivity for multiple nAChR subtypes.
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Affiliation(s)
- Colin S Cunningham
- Department of Pharmacology, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Megan J Moerke
- Department of Pharmacology, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Martin A Javors
- Department of Psychiatry, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - F Ivy Carroll
- Center for Organic and Medicinal Chemistry, Research Triangle Institute, Research Triangle Park, NC, USA
| | - Lance R McMahon
- Department of Pharmacology, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
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121
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Nicotinic and opioid receptor regulation of striatal dopamine D2-receptor mediated transmission. Sci Rep 2016; 6:37834. [PMID: 27886263 PMCID: PMC5122907 DOI: 10.1038/srep37834] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 11/02/2016] [Indexed: 12/28/2022] Open
Abstract
In addition to dopamine neuron firing, cholinergic interneurons (ChIs) regulate dopamine release in the striatum via presynaptic nicotinic receptors (nAChRs) on dopamine axon terminals. Synchronous activity of ChIs is necessary to evoke dopamine release through this pathway. The frequency-dependence of disynaptic nicotinic modulation has led to the hypothesis that nAChRs act as a high-pass filter in the dopaminergic microcircuit. Here, we used optogenetics to selectively stimulate either ChIs or dopamine terminals directly in the striatum. To measure the functional consequence of dopamine release, D2-receptor synaptic activity was assessed via virally overexpressed potassium channels (GIRK2) in medium spiny neurons (MSNs). We found that nicotinic-mediated dopamine release was blunted at higher frequencies because nAChRs exhibit prolonged desensitization after a single pulse of synchronous ChI activity. However, when dopamine neurons alone were stimulated, nAChRs had no effect at any frequency. We further assessed how opioid receptors modulate these two mechanisms of release. Bath application of the κ opioid receptor agonist U69593 decreased D2-receptor activation through both pathways, whereas the μ opioid receptor agonist DAMGO decreased D2-receptor activity only as a result of cholinergic-mediated dopamine release. Thus the release of dopamine can be independently modulated when driven by either dopamine neurons or cholinergic interneurons.
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122
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Criscitelli K, Avena NM. The neurobiological and behavioral overlaps of nicotine and food addiction. Prev Med 2016; 92:82-89. [PMID: 27509870 DOI: 10.1016/j.ypmed.2016.08.009] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Revised: 08/01/2016] [Accepted: 08/06/2016] [Indexed: 12/19/2022]
Abstract
Both cigarette smoking and obesity are significant public health concerns and are associated with increased risk of early mortality. It is well established that the mesolimbic dopamine pathway is an important component of the reward system within the brain and is implicated in the development of addiction. Indeed, nicotine and highly palatable foods are capable of altering dopamine release within this system, engendering addictive like responses in susceptible individuals. Although additional research is warranted, findings from animal and human literature have elucidated many of neuroadaptions that occur from exposure to nicotine and highly palatable foods, leading to a greater understanding of the underlying mechanisms contributing to these aberrant behaviors. In this review we present the findings taken from preclinical and clinical literature of the known effects of exposure to nicotine and highly palatable foods on the reward related circuitry within the brain. Further, we compare the neurobiological and behavioral overlaps between nicotine, highly palatable foods and obesity. Lastly, we examine the stigma associated with smoking, obesity and food addiction, and the consequences stigma has on the overall health and wellbeing of an individual.
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Affiliation(s)
- Kristen Criscitelli
- Department of Pharmacology and Systems Therapeutics, Icahn School of Medicine at Mount Sinai, New York, NY, United States
| | - Nicole M Avena
- Department of Pharmacology and Systems Therapeutics, Icahn School of Medicine at Mount Sinai, New York, NY, United States.
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Bordia T, Zhang D, Perez XA, Quik M. Striatal cholinergic interneurons and D2 receptor-expressing GABAergic medium spiny neurons regulate tardive dyskinesia. Exp Neurol 2016; 286:32-39. [PMID: 27658674 DOI: 10.1016/j.expneurol.2016.09.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 09/02/2016] [Accepted: 09/17/2016] [Indexed: 01/07/2023]
Abstract
Tardive dyskinesia (TD) is a drug-induced movement disorder that arises with antipsychotics. These drugs are the mainstay of treatment for schizophrenia and bipolar disorder, and are also prescribed for major depression, autism, attention deficit hyperactivity, obsessive compulsive and post-traumatic stress disorder. There is thus a need for therapies to reduce TD. The present studies and our previous work show that nicotine administration decreases haloperidol-induced vacuous chewing movements (VCMs) in rodent TD models, suggesting a role for the nicotinic cholinergic system. Extensive studies also show that D2 dopamine receptors are critical to TD. However, the precise involvement of striatal cholinergic interneurons and D2 medium spiny neurons (MSNs) in TD is uncertain. To elucidate their role, we used optogenetics with a focus on the striatum because of its close links to TD. Optical stimulation of striatal cholinergic interneurons using cholineacetyltransferase (ChAT)-Cre mice expressing channelrhodopsin2-eYFP decreased haloperidol-induced VCMs (~50%), with no effect in control-eYFP mice. Activation of striatal D2 MSNs using Adora2a-Cre mice expressing channelrhodopsin2-eYFP also diminished antipsychotic-induced VCMs, with no change in control-eYFP mice. In both ChAT-Cre and Adora2a-Cre mice, stimulation or mecamylamine alone similarly decreased VCMs with no further decline with combined treatment, suggesting nAChRs are involved. Striatal D2 MSN activation in haloperidol-treated Adora2a-Cre mice increased c-Fos+ D2 MSNs and decreased c-Fos+ non-D2 MSNs, suggesting a role for c-Fos. These studies provide the first evidence that optogenetic stimulation of striatal cholinergic interneurons and GABAergic MSNs modulates VCMs, and thus possibly TD. Moreover, they suggest nicotinic receptor drugs may reduce antipsychotic-induced TD.
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Affiliation(s)
- Tanuja Bordia
- Center for Health Sciences, Bioscience Division, SRI International, Menlo Park, CA 94025, USA
| | - Danhui Zhang
- Center for Health Sciences, Bioscience Division, SRI International, Menlo Park, CA 94025, USA
| | - Xiomara A Perez
- Center for Health Sciences, Bioscience Division, SRI International, Menlo Park, CA 94025, USA
| | - Maryka Quik
- Center for Health Sciences, Bioscience Division, SRI International, Menlo Park, CA 94025, USA.
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Abreu-Villaça Y, Correa-Santos M, Dutra-Tavares AC, Paes-Branco D, Nunes-Freitas A, Manhães AC, Filgueiras CC, Ribeiro-Carvalho A. A ten fold reduction of nicotine yield in tobacco smoke does not spare the central cholinergic system in adolescent mice. Int J Dev Neurosci 2016; 52:93-103. [PMID: 27287270 DOI: 10.1016/j.ijdevneu.2016.06.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2016] [Revised: 05/25/2016] [Accepted: 06/06/2016] [Indexed: 10/21/2022] Open
Abstract
The tobacco industry has gradually decreased nicotine content in cigarette smoke but the impact of this reduction on health is still controversial. Since the central cholinergic system is the primary site of action of nicotine, here, we investigated the effects of exposure of adolescent mice to tobacco smoke containing either high or low levels of nicotine on the central cholinergic system and the effects associated with cessation of exposure. From postnatal day (PN) 30 to 45, male and female Swiss mice were exposed to tobacco smoke (whole body exposure, 8h/day, 7 days/week) generated from 2R1F (HighNic group: 1.74mg nicotine/cigarette) or 4A1 (LowNic group: 0.14mg nicotine/cigarette) research cigarettes, whereas control mice were exposed to ambient air. Cholinergic biomarkers were assessed in the cerebral cortex and midbrain by the end of exposure (PN45), at short- (PN50) and long-term (PN75) deprivation. In the cortex, nicotinic cholinergic receptor upregulation was observed with either type of cigarette. In the midbrain, upregulation was detected only in HighNic mice and remained significant in females at short-term deprivation. The high-affinity choline transporter was reduced in the cortex: of HighNic mice by the end of exposure; of both HighNic and LowNic females at short-term deprivation; of LowNic mice at long-term deprivation. These decrements were separable from effects on choline acetyltransferase and acetylcholinesterase activities, suggesting cholinergic synaptic impairment. Here, we demonstrated central cholinergic alterations in an animal model of tobacco smoke exposure during adolescence. This system was sensitive even to tobacco smoke with very low nicotine content.
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Affiliation(s)
- Yael Abreu-Villaça
- Laboratório de Neurofisiologia, Departamento de Ciências Fisiológicas, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro (UERJ), Av. Prof. Manuel de Abreu 444, 5 andar-Vila Isabel, Rio de Janeiro, RJ 20550-170, Brazil.
| | - Monique Correa-Santos
- Laboratório de Neurofisiologia, Departamento de Ciências Fisiológicas, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro (UERJ), Av. Prof. Manuel de Abreu 444, 5 andar-Vila Isabel, Rio de Janeiro, RJ 20550-170, Brazil
| | - Ana C Dutra-Tavares
- Laboratório de Neurofisiologia, Departamento de Ciências Fisiológicas, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro (UERJ), Av. Prof. Manuel de Abreu 444, 5 andar-Vila Isabel, Rio de Janeiro, RJ 20550-170, Brazil
| | - Danielle Paes-Branco
- Laboratório de Neurofisiologia, Departamento de Ciências Fisiológicas, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro (UERJ), Av. Prof. Manuel de Abreu 444, 5 andar-Vila Isabel, Rio de Janeiro, RJ 20550-170, Brazil
| | - Andre Nunes-Freitas
- Laboratório de Neurofisiologia, Departamento de Ciências Fisiológicas, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro (UERJ), Av. Prof. Manuel de Abreu 444, 5 andar-Vila Isabel, Rio de Janeiro, RJ 20550-170, Brazil
| | - Alex C Manhães
- Laboratório de Neurofisiologia, Departamento de Ciências Fisiológicas, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro (UERJ), Av. Prof. Manuel de Abreu 444, 5 andar-Vila Isabel, Rio de Janeiro, RJ 20550-170, Brazil
| | - Cláudio C Filgueiras
- Laboratório de Neurofisiologia, Departamento de Ciências Fisiológicas, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro (UERJ), Av. Prof. Manuel de Abreu 444, 5 andar-Vila Isabel, Rio de Janeiro, RJ 20550-170, Brazil
| | - Anderson Ribeiro-Carvalho
- Departamento de Ciências, Faculdade de Formação de Professores da Universidade do Estado do Rio de Janeiro, Rua Dr. Francisco Portela 1470-Patronato, São Gonçalo, RJ 24435-005, Brazil
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125
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Weng SC, Huang JP, Huang YL, Lee TSH, Chen YH. Effects of tobacco exposure on perinatal suicidal ideation, depression, and anxiety. BMC Public Health 2016; 16:623. [PMID: 27448804 PMCID: PMC4957348 DOI: 10.1186/s12889-016-3254-z] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Accepted: 06/30/2016] [Indexed: 12/16/2022] Open
Abstract
Background Previous studies have stressed the importance of tobacco exposure for the mood disorders of depression and anxiety. Although a few studies have focused on perinatal women, none have specifically considered the effects of smoking and secondhand smoke exposure on perinatal suicidal ideation. Thus, this study aimed to investigate the relationships of smoking/secondhand smoke exposure status with suicidal ideation, depression, and anxiety from the first trimester to the first month post partum. Methods This cross-sectional study based on self-reported data was conducted at five hospitals in Taipei, Taiwan from July 2011 to June 2014. The questionnaire inquired about women’s pregnancy history, sociodemographic information, and pre-pregnancy smoking and secondhand smoke exposure status, and assessed their suicidal ideation, depression, and anxiety symptoms. Logistic regression models were used for analysis. Results In the 3867 women in the study, secondhand smoke exposure was positively associated with perinatal depression and suicidal ideation. Compared with women without perinatal secondhand smoke exposure, women exposed to secondhand smoke independently exhibited higher risks for suicidal ideation during the second trimester (odds ratio (OR) = 7.63; 95 % confidence interval (CI) = 3.25–17.93) and third trimester (OR = 4.03; 95 % CI = 1.76–9.23). Women exposed to secondhand smoke had an increased risk of depression, especially those aged 26–35 years (OR = 1.71; 95 % CI = 1.27–2.29). Conclusions Secondhand smoke exposure also considerably contributes to adverse mental health for women in perinatal periods, especially for the severe outcome of suicidal ideation. Our results strongly support the importance of propagating smoke-free environments to protect the health of perinatal women. Electronic supplementary material The online version of this article (doi:10.1186/s12889-016-3254-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Shu-Chuan Weng
- School of Public Health, College of Public Health, Taipei Medical University, Taipei, Taiwan
| | - Jian-Pei Huang
- Department of Obstetrics and Gynecology, Mackay Memorial Hospital, Taipei, Taiwan.,Mackay Memorial Hospital, New Taipei, Taiwan.,MacKay Junior College of Medicine, Nursing, and Management, Taipei, Taiwan
| | - Ya-Li Huang
- School of Public Health, College of Public Health, Taipei Medical University, Taipei, Taiwan.,Department of Public Health, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Tony Szu-Hsien Lee
- Department of Health Promotion and Education, National Taiwan Normal University, Taipei, Taiwan
| | - Yi-Hua Chen
- School of Public Health, College of Public Health, Taipei Medical University, Taipei, Taiwan.
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126
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Bastle RM, Peartree NA, Goenaga J, Hatch KN, Henricks A, Scott S, Hood LE, Neisewander JL. Immediate early gene expression reveals interactions between social and nicotine rewards on brain activity in adolescent male rats. Behav Brain Res 2016; 313:244-254. [PMID: 27435419 DOI: 10.1016/j.bbr.2016.07.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 07/12/2016] [Accepted: 07/15/2016] [Indexed: 01/27/2023]
Abstract
Smoking initiation predominantly occurs during adolescence, often in the presence of peers. Therefore, understanding the neural mechanisms underlying the rewarding effects of nicotine and social stimuli is vital. Using the conditioned place preference (CPP) procedure, we measured immediate early gene (IEG) expression in animals following exposure either to a reward-conditioned environment or to the unconditioned stimuli (US). Adolescent, male rats were assigned to the following CPP US conditions: (1) Saline+Isolated, (2) Nicotine+Isolated, (3) Saline+Social, or (4) Nicotine+Social. For Experiment 1, brain tissue was collected 90min following the CPP expression test and processed for Fos immunohistochemistry. We found that rats conditioned with nicotine with or without a social partner exhibited CPP; however, we found no group differences in Fos expression in any brain region analyzed, with the exception of the nucleus accumbens core that exhibited a social-induced attenuation in Fos expression. For Experiment 2, brain tissue was collected 90min following US exposure during the last conditioning session. We found social reward-induced increases in IEG expression in striatal and amydalar subregions. In contrast, nicotine reduced IEG expression in prefrontal and striatal subregions. Reward interactions were also found in the dorsolateral striatum, basolateral amygdala, and ventral tegmental area where nicotine alone attenuated IEG expression and social reward reversed this effect. These results suggest that in general social rewards enhance, whereas nicotine attenuates, activation of mesocorticolimbic regions; however, the rewards given together interact to enhance activation in some regions. The findings contribute to knowledge of how a social environment influences nicotine effects.
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Affiliation(s)
- Ryan M Bastle
- Department of Psychology, Arizona State University, Tempe, AZ 85287-4501, United States; School of Life Sciences, Arizona State University, Tempe, AZ 85287-4501, United States
| | - Natalie A Peartree
- Department of Psychology, Arizona State University, Tempe, AZ 85287-4501, United States
| | - Julianna Goenaga
- School of Life Sciences, Arizona State University, Tempe, AZ 85287-4501, United States
| | - Kayla N Hatch
- School of Life Sciences, Arizona State University, Tempe, AZ 85287-4501, United States
| | - Angela Henricks
- Department of Psychology, Arizona State University, Tempe, AZ 85287-4501, United States
| | - Samantha Scott
- School of Life Sciences, Arizona State University, Tempe, AZ 85287-4501, United States
| | - Lauren E Hood
- Department of Psychology, Arizona State University, Tempe, AZ 85287-4501, United States
| | - Janet L Neisewander
- Department of Psychology, Arizona State University, Tempe, AZ 85287-4501, United States; School of Life Sciences, Arizona State University, Tempe, AZ 85287-4501, United States.
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127
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Gozen O, Nesil T, Kanit L, Koylu EO, Pogun S. Nicotinic cholinergic and dopaminergic receptor mRNA expression in male and female rats with high or low preference for nicotine. THE AMERICAN JOURNAL OF DRUG AND ALCOHOL ABUSE 2016; 42:556-566. [PMID: 27428758 DOI: 10.1080/00952990.2016.1198799] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
BACKGROUND Nicotine exerts its central actions through nicotinic acetylcholine receptors (nAChRs), which in turn regulate major neurotransmitter systems including dopamine. Nicotinic and dopaminergic systems play significant roles in physiological functions, neuropsychiatric disorders, and addiction. OBJECTIVES To evaluate possible differences in the expression of nAChR subunit and dopamine receptor (DR) mRNAs following voluntary nicotine intake. METHODS Male and female rats (n = 67) were exposed to long-term free-choice oral nicotine (24 hours/day, 6 weeks); rats with maximum and minimum nicotine preference/intake were selected. The mRNA levels of genes encoding α4,β2,α5, and α7 nAChR subunits and DR Drd1and Drd2 subtypes were evaluated in the striatum (STR), prefrontal cortex (PFC), and hippocampus using quantitative real-time polymerase chain reaction in selected rats (n = 30) and their control groups (n = 15). RESULTS In addition to baseline differences, expression changes were observed in the mRNA levels of evaluated genes in rats exposed to voluntary oral nicotine in a brain region-, sex-, and preference-related manner. Nicotine intake is correlated negatively with Chrnb2, Chrna7 and positively with Drd1 expression. In the cholinergic system, regional differences in Chnrb2 and Chrna5, sex differences in Chrna4 and Chrna5, and nicotine preference effects in the expression of all subunits except α4 were observed. Chrna5 was lower in maximum than in minimum preferring, and in male than female rats, supporting the inhibitory role of the α5 subunit in nicotine dependence. Nicotine increased Drd2 mRNA expression only in minimum preferring female rats in STR and PFC. CONCLUSION Modulation of nAChR and DR gene expression by nicotine may have clinical implications and aid drug development. Pharmaceuticals targeting the nicotinic cholinergic and dopaminergic systems might be expected to have differential efficacy that varies with the patient's sex or smoking status.
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Affiliation(s)
- Oguz Gozen
- a Center for Brain Research , Ege University , Bornova , Izmir , Turkey.,b School of Medicine Department of Physiology , Ege University , Bornova , Izmir , Turkey
| | - Tanseli Nesil
- a Center for Brain Research , Ege University , Bornova , Izmir , Turkey
| | - Lutfiye Kanit
- a Center for Brain Research , Ege University , Bornova , Izmir , Turkey.,b School of Medicine Department of Physiology , Ege University , Bornova , Izmir , Turkey
| | - Ersin O Koylu
- a Center for Brain Research , Ege University , Bornova , Izmir , Turkey.,b School of Medicine Department of Physiology , Ege University , Bornova , Izmir , Turkey
| | - Sakire Pogun
- a Center for Brain Research , Ege University , Bornova , Izmir , Turkey
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128
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Hayase T. Putative Epigenetic Involvement of the Endocannabinoid System in Anxiety- and Depression-Related Behaviors Caused by Nicotine as a Stressor. PLoS One 2016; 11:e0158950. [PMID: 27404492 PMCID: PMC4942073 DOI: 10.1371/journal.pone.0158950] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Accepted: 06/26/2016] [Indexed: 01/01/2023] Open
Abstract
Like various stressors, the addictive use of nicotine (NC) is associated with emotional symptoms such as anxiety and depression, although the underlying mechanisms have not yet been fully elucidated due to the complicated involvement of target neurotransmitter systems. In the elicitation of these emotional symptoms, the fundamental involvement of epigenetic mechanisms such as histone acetylation has recently been suggested. Furthermore, among the interacting neurotransmitter systems implicated in the effects of NC and stressors, the endocannabinoid (ECB) system is considered to contribute indispensably to anxiety and depression. In the present study, the epigenetic involvement of histone acetylation induced by histone deacetylase (HDAC) inhibitors was investigated in anxiety- and depression-related behavioral alterations caused by NC and/or immobilization stress (IM). Moreover, based on the contributing roles of the ECB system, the interacting influence of ECB ligands on the effects of HDAC inhibitors was evaluated in order to examine epigenetic therapeutic interventions. Anxiety-like (elevated plus-maze test) and depression-like (forced swimming test) behaviors, which were observed in mice treated with repeated (4 days) NC (subcutaneous 0.8 mg/kg) and/or IM (10 min), were blocked by the HDAC inhibitors sodium butyrate (SB) and valproic acid (VA). The cannabinoid type 1 (CB1) agonist ACPA (arachidonylcyclopropylamide; AC) also antagonized these behaviors. Conversely, the CB1 antagonist SR 141716A (SR), which counteracted the effects of AC, attenuated the anxiolytic-like effects of the HDAC inhibitors commonly in the NC and/or IM groups. SR also attenuated the antidepressant-like effects of the HDAC inhibitors, most notably in the IM group. From these results, the combined involvement of histone acetylation and ECB system was shown in anxiety- and depression-related behaviors. In the NC treatment groups, the limited influence of SR against the HDAC inhibitor-induced antidepressant-like effects may reflect the characteristic involvement of histone acetylation within the NC-related neurotransmitter systems other than the ECB system.
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Affiliation(s)
- Tamaki Hayase
- Department of Legal Medicine, Kyoto University, Kyoto 606–8501, Japan
- * E-mail:
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129
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Wen L, Yang Z, Cui W, Li MD. Crucial roles of the CHRNB3-CHRNA6 gene cluster on chromosome 8 in nicotine dependence: update and subjects for future research. Transl Psychiatry 2016; 6:e843. [PMID: 27327258 PMCID: PMC4931601 DOI: 10.1038/tp.2016.103] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2015] [Revised: 04/24/2016] [Accepted: 04/26/2016] [Indexed: 12/24/2022] Open
Abstract
Cigarette smoking is a leading cause of preventable death throughout the world. Nicotine, the primary addictive compound in tobacco, plays a vital role in the initiation and maintenance of its use. Nicotine exerts its pharmacological roles through nicotinic acetylcholine receptors (nAChRs), which are ligand-gated ion channels consisting of five membrane-spanning subunits. Besides the CHRNA4, CHRNB2 and CHRNA5/A3/B4 cluster on chromosome 15, which has been investigated intensively, recent evidence from both genome-wide association studies and candidate gene-based association studies has revealed the crucial roles of the CHRNB3-CHRNA6 gene cluster on chromosome 8 in nicotine dependence (ND). These studies demonstrate two distinct loci within this region. The first one is tagged by rs13277254, upstream of the CHRNB3 gene, and the other is tagged by rs4952, a coding single nucleotide polymorphism in exon 5 of that gene. Functional studies by genetic manipulation in mice have shown that α6*-nAChRs, located in the ventral tegmental area (VTA), are of great importance in controlling nicotine self-administration. However, when the α6 subunit is selectively re-expressed in the VTA of the α6(-/-) mouse by a lentiviral vector, the reinforcing property of nicotine is restored. To further determine the role of α6*-nAChRs in the process of nicotine-induced reward and withdrawal, genetic knock-in strains have been examined, which showed that replacement of Leu with Ser in the 9' residue in the M2 domain of α6 produces nicotine-hypersensitive mice (α6 L9'S) with enhanced dopamine release. Moreover, nicotine-induced upregulation may be another ingredient in the pathology of nicotine addiction although the effect of chronic nicotine exposure on the expression of α6-containing receptors is controversial. To gain a better understanding of the pathological processes underlying ND and ND-related behaviors and to promote the development of effective smoking cessation therapies, we here present the most recent studies concerning the genetic effects of the CHRNB3-CHRNA6 gene cluster in ND.
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Affiliation(s)
- L Wen
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Z Yang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - W Cui
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - M D Li
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China,Air Center for Air Pollution and Health, Zhejiang University, Hangzhou, China,Department of Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA, USA,State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, 310003, China or Department of Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA 22903, USA. E-mail:
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130
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Morissette M, Morin N, Grégoire L, Rajput A, Rajput AH, Di Paolo T. Brain α7 nicotinic acetylcholine receptors in MPTP-lesioned monkeys and parkinsonian patients. Biochem Pharmacol 2016; 109:62-69. [DOI: 10.1016/j.bcp.2016.03.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Accepted: 03/29/2016] [Indexed: 10/22/2022]
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131
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Le Foll B, Chefer SI, Kimes AS, Stein EA, Goldberg SR, Mukhin AG. Impact of short access nicotine self-administration on expression of α4β2* nicotinic acetylcholine receptors in non-human primates. Psychopharmacology (Berl) 2016; 233:1829-35. [PMID: 26911381 PMCID: PMC4846528 DOI: 10.1007/s00213-016-4250-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Accepted: 02/16/2016] [Indexed: 10/22/2022]
Abstract
RATIONALE Although nicotine exposure upregulates the α4β2* subtype of nicotinic acetylcholine receptors (nAChRs), the upregulation of nAChRs in non-human primates voluntarily self-administering nicotine has never been demonstrated. OBJECTIVES The objective of the study is to determine if short access to nicotine in a non-human primate model of nicotine self-administration is sufficient to induce nAChRs upregulation. METHODS We combined a nicotine self-administration paradigm with in vivo measure of α4β2* nAChRs using 2-[(18)F]fluoro-A-85380 (2-FA) and positron emission tomography (PET) in six squirrel monkeys. PET measurement was performed before and after intravenous nicotine self-administration (unit dose 10 μg/kg per injection). Monkeys were trained to self-administer nicotine under a fixed-ratio (FR) schedule of reinforcement. Intermittent access (1 h daily per weekday) to nicotine was allowed for 4 weeks and levels of α4β2* nAChRs were measured 4 days later. RESULTS This intermittent access was sufficient to induce upregulation of α4β2* receptors in the whole brain (31 % upregulation) and in specific brain areas (+36 % in amygdala and +62 % in putamen). CONCLUSIONS These results indicate that intermittent nicotine exposure is sufficient to produce change in nAChRs expression.
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Affiliation(s)
- Bernard Le Foll
- Translational Addiction Research Laboratory, Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health (CAMH), 33 Russell Street, Toronto, ON, Canada, M5S 2S1. .,Departments of Family and Community Medicine, Pharmacology, Psychiatry, Institute of Medical Sciences, University of Toronto, Toronto, Canada. .,Ambulatory Care and Structured Treatment Program, Centre for Addiction and Mental Health, Toronto, Canada. .,Preclinical Pharmacology Section, Intramural Research Program, National Institute on Drug Abuse, NIH, DHHS, Baltimore, MD, 21224, USA.
| | - Svetlana I. Chefer
- Neuroimaging Research Branch, Intramural Research Program, National Institute on Drug Abuse, Baltimore, MD 21224,The Integrated Research Facility, Division of Clinical Research, National Institute of Allergy and Infectious Disease, NIH, Fort. Detrick, Frederick, MD, 21702
| | - Alane S. Kimes
- Neuroimaging Research Branch, Intramural Research Program, National Institute on Drug Abuse, Baltimore, MD 21224,Office of the Clinical Director (retired), Intramural Research Program, National Institute on Drug Abuse, Baltimore, MD 21224
| | - Elliot A. Stein
- Neuroimaging Research Branch, Intramural Research Program, National Institute on Drug Abuse, Baltimore, MD 21224
| | - Steven R. Goldberg
- Preclinical Pharmacology Section, Intramural Research Program, National Institute on Drug Abuse, Baltimore, MD 21224
| | - Alexey G. Mukhin
- Neuroimaging Research Branch, Intramural Research Program, National Institute on Drug Abuse, Baltimore, MD 21224,Department Psychiatry and Behavioral Sciences and Center for Smoking Cessation, Duke University Medical Center, 2424 Erwin Road, Suite 201, Durham, NC 27705
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132
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Hahn B, Riegger KE, Elmer GI. Strain dependency of the effects of nicotine and mecamylamine in a rat model of attention. Psychopharmacology (Berl) 2016; 233:1427-34. [PMID: 26875755 PMCID: PMC4814296 DOI: 10.1007/s00213-016-4236-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Accepted: 02/03/2016] [Indexed: 11/30/2022]
Abstract
RATIONALE Processes of attention have a heritable component, suggesting that genetic predispositions may predict variability in the response to attention-enhancing drugs. Among lead compounds with attention-enhancing properties are nicotinic acetylcholine receptor (nAChR) agonists. OBJECTIVES This study aims to test, by comparing three rat strains, whether genotype may influence the sensitivity to nicotine in the 5-choice serial reaction time task (5-CSRTT), a rodent model of attention. METHODS Strains tested were Long Evans (LE), Sprague Dawley (SD), and Wistar rats. The 5-CSRTT requires responses to light stimuli presented randomly in one of five locations. The effect of interest was an increased percentage of responses in the correct location (accuracy), the strongest indicator of improved attention. RESULTS Nicotine (0.05-0.2 mg/kg s.c.) reduced omission errors and response latency and increased anticipatory responding in all strains. In contrast, nicotine dose-dependently increased accuracy in Wistar rats only. The nAChR antagonist mecamylamine (0.75-3 mg/kg s.c.) increased omissions, slowed responses, and reduced anticipatory responding in all strains. There were no effects on accuracy, which was surprising giving the clear improvement with nicotine in the Wistar group. CONCLUSIONS The findings suggest strain differences in the attention-enhancing effects of nicotine, which would indicate that genetic predispositions predict variability in the efficacy of nAChR compounds for enhancing attention. The absence of effect of mecamylamine on response accuracy may suggest a contribution of nAChR desensitization to the attention-enhancing effects of nicotine.
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Affiliation(s)
- Britta Hahn
- University of Maryland School of Medicine, Maryland Psychiatric Research Center, P.O. Box 21247, Baltimore, MD, 21228, USA.
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133
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Kaya E, Gozen O, Ugur M, Koylu EO, Kanit L, Balkan B. Nicotine regulates cocaine-amphetamine-Regulated Transcript (Cart) in the mesocorticolimbic system. Synapse 2016; 70:283-92. [PMID: 26990424 DOI: 10.1002/syn.21903] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Revised: 03/03/2016] [Accepted: 03/10/2016] [Indexed: 12/21/2022]
Abstract
Cocaine-and-Amphetamine Regulated Transcript (CART) mRNA and peptides are intensely expressed in the brain regions comprising mesocorticolimbic system. Studies suggest that CART peptides may have a role in the regulation of reward circuitry. The present study aimed to examine the effect of nicotine on CART expression in the mesocorticolimbic system. Three different doses of nicotine (0.2, 0.4, 0.6 mg/kg free base) were injected subcutaneously for 5 days, and on day 6, rats were decapitated following a challenge dose. CART mRNA and peptide levels in medial prefrontal cortex (mPFC), nucleus accumbens (NAc), dorsal striatum (DST), amygdala (AMG), lateral hypothalamic area (LHA), and ventral tegmental area (VTA) were measured by quantitative real-time PCR (qPCR) and Western Blot analysis, respectively. In the mPFC, 0.4 and 0.6 mg/kg nicotine, decreased CART peptide levels whereas there was no effect on CART mRNA levels. In the VTA, a down-regulation of CART peptide expression was observed with 0.2 and 0.6 mg/kg nicotine. Conversely, 0.4 and 0.6 mg/kg nicotine increased CART mRNA levels in the AMG without affecting the CART peptide expression. Nicotine did not regulate CART mRNA or CART peptide expression in the NAc, DST, and LHA. We conclude that nicotine regulates CART expression in the mesocorticolimbic system and this regulation may play an important role in nicotine reward. Synapse 70:283-292, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Egemen Kaya
- Department of Physiology, School of Medicine, Ege University, Izmir, Turkey.,Center for Brain Research, Ege University, Izmir, Turkey
| | - Oguz Gozen
- Department of Physiology, School of Medicine, Ege University, Izmir, Turkey.,Center for Brain Research, Ege University, Izmir, Turkey
| | - Muzeyyen Ugur
- Department of Physiology, School of Medicine, Ege University, Izmir, Turkey
| | - Ersin O Koylu
- Department of Physiology, School of Medicine, Ege University, Izmir, Turkey.,Center for Brain Research, Ege University, Izmir, Turkey
| | - Lutfiye Kanit
- Department of Physiology, School of Medicine, Ege University, Izmir, Turkey.,Center for Brain Research, Ege University, Izmir, Turkey
| | - Burcu Balkan
- Department of Physiology, School of Medicine, Ege University, Izmir, Turkey.,Center for Brain Research, Ege University, Izmir, Turkey
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134
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Neuronal Nicotinic Acetylcholine Receptor Modulators Reduce Sugar Intake. PLoS One 2016; 11:e0150270. [PMID: 27028298 PMCID: PMC4814119 DOI: 10.1371/journal.pone.0150270] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Accepted: 02/11/2016] [Indexed: 12/21/2022] Open
Abstract
Excess sugar consumption has been shown to contribute directly to weight gain, thus contributing to the growing worldwide obesity epidemic. Interestingly, increased sugar consumption has been shown to repeatedly elevate dopamine levels in the nucleus accumbens (NAc), in the mesolimbic reward pathway of the brain similar to many drugs of abuse. We report that varenicline, an FDA-approved nicotinic acetylcholine receptor (nAChR) partial agonist that modulates dopamine in the mesolimbic reward pathway of the brain, significantly reduces sucrose consumption, especially in a long-term consumption paradigm. Similar results were observed with other nAChR drugs, namely mecamylamine and cytisine. Furthermore, we show that long-term sucrose consumption increases α4β2 * and decreases α6β2* nAChRs in the nucleus accumbens, a key brain region associated with reward. Taken together, our results suggest that nAChR drugs such as varenicline may represent a novel treatment strategy for reducing sugar consumption.
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135
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Alibekova R, Huang JP, Lee TSH, Au HK, Chen YH. Effects of smoking on perinatal depression and anxiety in mothers and fathers: A prospective cohort study. J Affect Disord 2016; 193:18-26. [PMID: 26766030 DOI: 10.1016/j.jad.2015.12.027] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Revised: 12/14/2015] [Accepted: 12/19/2015] [Indexed: 12/12/2022]
Abstract
INTRODUCTION Considerable concern persists on tobacco use during perinatal periods. No study has simultaneously investigated the longitudinal association of paternal smoking with maternal and paternal depressive and anxiety symptoms during perinatal periods. METHODS In this prospective study, 533 couples (pregnant women and their husbands) completed 5 self-report instruments from early pregnancy until 6 months postpartum. Generalized estimating equations were used for the analyses. RESULTS We found that fathers who smoked in the mother's presence had higher depressive (regression coefficient=1.0, 95% confidence interval (CI) 0.3-1.8) and anxiety symptoms (3.0, 95% CI=1.2-4.7) during perinatal periods compared with nonsmoking fathers. Paternal smoking in the mother's presence also increased maternal disturbances, especially for depression during pregnancy (1.2, 95% CI=0.1-2.3) and anxiety during the postpartum period (3.4, 95% CI=0.6-6.3). No significant association was found between paternal smoking but not in the mother's presence and maternal emotional disturbances. Paternal smoking but not in the mother's presence affected only paternal anxiety, especially in the postpartum period (regression coefficient 2.7, 95% CI 0.7-4.7) compared with nonsmokers. LIMITATIONS Self-report measures were used. The effects of maternal smoking could not be estimated because of the small sample of pregnant women who disclosed their smoking status. CONCLUSIONS These findings imply a necessity to combine strategies for smoking cessation with interventions for affective disturbances in fathers. We also stress the importance of at least restricting the father's smoking in the presence of the pregnant wife during perinatal periods if smoking cessation is tentatively unattainable.
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Affiliation(s)
- Raushan Alibekova
- School of Public Health, College of Public Health and Nutrition, Taipei Medical University, Taipei, Taiwan
| | - Jian-Pei Huang
- Department of Obstetrics and Gynecology, Mackay Memorial Hospital, Taipei, Taiwan
| | - Tony Szu-Hsien Lee
- Department of Health Promotion and Education, National Taiwan Normal University, Taipei, Taiwan
| | - Heng-Kien Au
- Department of Obstetrics and Gynecology, Taipei Medical University Hospital, Taipei, Taiwan
| | - Yi-Hua Chen
- School of Public Health, College of Public Health and Nutrition, Taipei Medical University, Taipei, Taiwan.
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Zhang Y, Yanagawa Y, Saito Y. Nicotinic acetylcholine receptor-mediated responses in medial vestibular and prepositus hypoglossi nuclei neurons showing distinct neurotransmitter phenotypes. J Neurophysiol 2016; 115:2649-57. [PMID: 26936981 DOI: 10.1152/jn.00852.2015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Accepted: 02/27/2016] [Indexed: 11/22/2022] Open
Abstract
Cholinergic transmission in both the medial vestibular nucleus (MVN) and prepositus hypoglossi nucleus (PHN) plays an important role in horizontal eye movements. We previously demonstrated that the current responses mediated via nicotinic acetylcholine receptors (nAChRs) were larger than those mediated via muscarinic acetylcholine receptors (mAChRs) in cholinergic MVN and PHN neurons that project to the cerebellum. In this study, to clarify the predominant nAChR responses and the expression patterns of nAChRs in MVN and PHN neurons that exhibit distinct neurotransmitter phenotypes, we identified cholinergic, inhibitory, and glutamatergic neurons using specific transgenic rats and investigated current responses to the application of acetylcholine (ACh) using whole cell recordings in brain stem slices. ACh application induced larger nAChR-mediated currents than mAChR-mediated currents in every neuronal phenotype. In the presence of an mAChR antagonist, we found three types of nAChR-mediated currents that exhibited different rise and decay times and designated these as fast (F)-, slow (S)-, and fast and slow (FS)-type currents. F-type currents were the predominant response in inhibitory MVN neurons, whereas S-type currents were observed in the majority of glutamatergic MVN and PHN neurons. No dominant response type was observed in cholinergic neurons. Pharmacological analyses revealed that the F-, S-, and FS-type currents were mainly mediated by α7, non-α7, and both α7 and non-α7 nAChRs, respectively. These findings suggest that cholinergic responses in the major neuronal populations of the MVN and PHN are predominantly mediated by nAChRs and that the expression of α7 and non-α7 nAChRs differ among the neuronal phenotypes.
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Affiliation(s)
- Yue Zhang
- Department of Genetic and Behavioral Neuroscience, Gunma University Graduate School of Medicine, Maebashi, Gunma, Japan; Department of Physiology, Dalian Medical University, Dalian, China
| | - Yuchio Yanagawa
- Department of Genetic and Behavioral Neuroscience, Gunma University Graduate School of Medicine, Maebashi, Gunma, Japan; Japan Science and Technology Agency, Core Research for Evolutional Science and Technology (CREST), Chiyoda-ku, Tokyo, Japan; and
| | - Yasuhiko Saito
- Department of Genetic and Behavioral Neuroscience, Gunma University Graduate School of Medicine, Maebashi, Gunma, Japan; Department of Neurophysiology, Nara Medical University, Kashihara, Nara, Japan
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137
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Parikh V, Kutlu MG, Gould TJ. nAChR dysfunction as a common substrate for schizophrenia and comorbid nicotine addiction: Current trends and perspectives. Schizophr Res 2016; 171:1-15. [PMID: 26803692 PMCID: PMC4762752 DOI: 10.1016/j.schres.2016.01.020] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Revised: 01/07/2016] [Accepted: 01/10/2016] [Indexed: 11/18/2022]
Abstract
INTRODUCTION The prevalence of tobacco use in the population with schizophrenia is enormously high. Moreover, nicotine dependence is found to be associated with symptom severity and poor outcome in patients with schizophrenia. The neurobiological mechanisms that explain schizophrenia-nicotine dependence comorbidity are not known. This study systematically reviews the evidence highlighting the contribution of nicotinic acetylcholine receptors (nAChRs) to nicotine abuse in schizophrenia. METHODS Electronic data bases (Medline, Google Scholar, and Web of Science) were searched using the selected key words that match the aims set forth for this review. A total of 276 articles were used for the qualitative synthesis of this review. RESULTS Substantial evidence from preclinical and clinical studies indicated that dysregulation of α7 and β2-subunit containing nAChRs account for the cognitive and affective symptoms of schizophrenia and nicotine use may represent a strategy to remediate these symptoms. Additionally, recent meta-analyses proposed that early tobacco use may itself increase the risk of developing schizophrenia. Genetic studies demonstrating that nAChR dysfunction that may act as a shared vulnerability factor for comorbid tobacco dependence and schizophrenia were found to support this view. The development of nAChR modulators was considered an effective therapeutic strategy to ameliorate psychiatric symptoms and to promote smoking cessation in schizophrenia patients. CONCLUSIONS The relationship between schizophrenia and smoking is complex. While the debate for the self-medication versus addiction vulnerability hypothesis continues, it is widely accepted that a dysfunction in the central nAChRs represent a common substrate for various symptoms of schizophrenia and comorbid nicotine dependence.
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Affiliation(s)
- Vinay Parikh
- Department of Psychology and Neuroscience Program, Temple University, Philadelphia, PA 19112, United States.
| | - Munir Gunes Kutlu
- Department of Psychology and Neuroscience Program, Temple University, Philadelphia, PA 19112, United States
| | - Thomas J Gould
- Department of Psychology and Neuroscience Program, Temple University, Philadelphia, PA 19112, United States
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Morud J, Adermark L, Perez-Alcazar M, Ericson M, Söderpalm B. Nicotine produces chronic behavioral sensitization with changes in accumbal neurotransmission and increased sensitivity to re-exposure. Addict Biol 2016; 21:397-406. [PMID: 25581387 DOI: 10.1111/adb.12219] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Tobacco use is often associated with long-term addiction as well as high risk of relapse following cessation. This is suggestive of persistent neural adaptations, but little is known about the long-lasting effects of nicotine on neural circuits. In order to investigate the long-term effects of nicotine exposure, Wistar rats were treated for 3 weeks with nicotine (0.36 mg/kg), and the duration of behavioral and neurophysiological adaptations was evaluated 7 months later. We found that increased drug-induced locomotion persisted 7 months after the initial behavioral sensitization. In vitro analysis of synaptic activity in the core and shell of the nucleus accumbens (nAc) revealed a decrease in input/output function in both regions of nicotine-treated rats as compared to vehicle-treated control rats. In addition, administration of the dopamine D2 receptor agonist quinpirole (5 μM) significantly increased evoked population spike amplitude in the nAc shell of nicotine-treated rats as compared to vehicle-treated control rats. To test whether nicotine exposure creates long-lasting malleable circuits, animals were re-exposed to nicotine 7 months after the initial exposure. This treatment revealed an increased sensitivity to nicotine among animals previously exposed to nicotine, with higher nicotine-induced locomotion responses than observed initially. In vitro electrophysiological recordings in re-exposed rats detected an increased sensitivity to dopamine D2 receptor activation. These results suggest that nicotine produces persistent neural adaptations that make the system sensitive and receptive to future nicotine re-exposure.
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Affiliation(s)
- Julia Morud
- Addiction Biology Unit; Department of Psychiatry and Neurochemistry; Institute of Neuroscience and Physiology; The Sahlgrenska Academy at University of Gothenburg; Sweden
| | - Louise Adermark
- Addiction Biology Unit; Department of Psychiatry and Neurochemistry; Institute of Neuroscience and Physiology; The Sahlgrenska Academy at University of Gothenburg; Sweden
| | - Marta Perez-Alcazar
- Department of Physiology; Institute of Neuroscience and Physiology; The Sahlgrenska Academy at the University of Gothenburg; Sweden
| | - Mia Ericson
- Addiction Biology Unit; Department of Psychiatry and Neurochemistry; Institute of Neuroscience and Physiology; The Sahlgrenska Academy at University of Gothenburg; Sweden
| | - Bo Söderpalm
- Addiction Biology Unit; Department of Psychiatry and Neurochemistry; Institute of Neuroscience and Physiology; The Sahlgrenska Academy at University of Gothenburg; Sweden
- Beroendekliniken; Sahlgrenska University Hospital; Sweden
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Optogenetic activation of striatal cholinergic interneurons regulates L-dopa-induced dyskinesias. Neurobiol Dis 2016; 91:47-58. [PMID: 26921469 DOI: 10.1016/j.nbd.2016.02.019] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 01/26/2016] [Accepted: 02/23/2016] [Indexed: 11/23/2022] Open
Abstract
L-dopa-induced dyskinesias (LIDs) are a serious complication of L-dopa therapy for Parkinson's disease. Emerging evidence indicates that the nicotinic cholinergic system plays a role in LIDs, although the pathways and mechanisms are poorly understood. Here we used optogenetics to investigate the role of striatal cholinergic interneurons in LIDs. Mice expressing cre-recombinase under the control of the choline acetyltransferase promoter (ChAT-Cre) were lesioned by unilateral injection of 6-hydroxydopamine. AAV5-ChR2-eYFP or AAV5-control-eYFP was injected into the dorsolateral striatum, and optical fibers implanted. After stable virus expression, mice were treated with L-dopa. They were then subjected to various stimulation protocols for 2h and LIDs rated. Continuous stimulation with a short duration optical pulse (1-5ms) enhanced LIDs. This effect was blocked by the general muscarinic acetylcholine receptor (mAChR) antagonist atropine indicating it was mAChR-mediated. By contrast, continuous stimulation with a longer duration optical pulse (20ms to 1s) reduced LIDs to a similar extent as nicotine treatment (~50%). The general nicotinic acetylcholine receptor (nAChR) antagonist mecamylamine blocked the decline in LIDs with longer optical pulses showing it was nAChR-mediated. None of the stimulation regimens altered LIDs in control-eYFP mice. Lesion-induced motor impairment was not affected by optical stimulation indicating that cholinergic transmission selectively regulates LIDs. Longer pulse stimulation increased the number of c-Fos expressing ChAT neurons, suggesting that changes in this immediate early gene may be involved. These results demonstrate that striatal cholinergic interneurons play a critical role in LIDs and support the idea that nicotine treatment reduces LIDs via nAChR desensitization.
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140
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Van Skike CE, Maggio SE, Reynolds AR, Casey EM, Bardo MT, Dwoskin LP, Prendergast MA, Nixon K. Critical needs in drug discovery for cessation of alcohol and nicotine polysubstance abuse. Prog Neuropsychopharmacol Biol Psychiatry 2016; 65:269-87. [PMID: 26582145 PMCID: PMC4679525 DOI: 10.1016/j.pnpbp.2015.11.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 11/10/2015] [Accepted: 11/11/2015] [Indexed: 01/29/2023]
Abstract
Polysubstance abuse of alcohol and nicotine has been overlooked in our understanding of the neurobiology of addiction and especially in the development of novel therapeutics for its treatment. Estimates show that as many as 92% of people with alcohol use disorders also smoke tobacco. The health risks associated with both excessive alcohol consumption and tobacco smoking create an urgent biomedical need for the discovery of effective cessation treatments, as opposed to current approaches that attempt to independently treat each abused agent. The lack of treatment approaches for alcohol and nicotine abuse/dependence mirrors a similar lack of research in the neurobiology of polysubstance abuse. This review discusses three critical needs in medications development for alcohol and nicotine co-abuse: (1) the need for a better understanding of the clinical condition (i.e. alcohol and nicotine polysubstance abuse), (2) the need to better understand how these drugs interact in order to identify new targets for therapeutic development and (3) the need for animal models that better mimic this human condition. Current and emerging treatments available for the cessation of each drug and their mechanisms of action are discussed within this context followed by what is known about the pharmacological interactions of alcohol and nicotine. Much has been and will continue to be gained from studying comorbid alcohol and nicotine exposure.
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Affiliation(s)
- C E Van Skike
- Department of Pharmaceutical Sciences, University of Kentucky, Lexington, KY 40536, United States
| | - S E Maggio
- Department of Psychology, University of Kentucky, Lexington, KY 40536, United States
| | - A R Reynolds
- Department of Psychology, University of Kentucky, Lexington, KY 40536, United States
| | - E M Casey
- Department of Pharmaceutical Sciences, University of Kentucky, Lexington, KY 40536, United States
| | - M T Bardo
- Department of Psychology, University of Kentucky, Lexington, KY 40536, United States; Center for Drug Abuse and Research Translation, University of Kentucky, Lexington, KY 40536, United States; Spinal Cord and Brain Injury Research Center, University of Kentucky, Lexington, KY 40536, United States
| | - L P Dwoskin
- Department of Pharmaceutical Sciences, University of Kentucky, Lexington, KY 40536, United States; Center for Drug Abuse and Research Translation, University of Kentucky, Lexington, KY 40536, United States
| | - M A Prendergast
- Department of Psychology, University of Kentucky, Lexington, KY 40536, United States; Spinal Cord and Brain Injury Research Center, University of Kentucky, Lexington, KY 40536, United States
| | - K Nixon
- Department of Pharmaceutical Sciences, University of Kentucky, Lexington, KY 40536, United States; Spinal Cord and Brain Injury Research Center, University of Kentucky, Lexington, KY 40536, United States.
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141
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Parikh V, Cole RD, Patel PJ, Poole RL, Gould TJ. Cognitive control deficits during mecamylamine-precipitated withdrawal in mice: Possible links to frontostriatal BDNF imbalance. Neurobiol Learn Mem 2016; 128:110-6. [PMID: 26775017 DOI: 10.1016/j.nlm.2016.01.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Revised: 12/02/2015] [Accepted: 01/10/2016] [Indexed: 02/06/2023]
Abstract
Nicotine is a major psychoactive and addictive component of tobacco. Although cessation of tobacco use produces various somatic and affective symptoms, withdrawal-related cognitive deficits are considered to be a critical symptom that predict relapse. Therefore, delineating the cognitive mechanisms of nicotine withdrawal may likely provide gainful insights into the neurobiology of nicotine addiction. The present study was designed to examine the effects of nicotine withdrawal induced by mecamylamine, a non-specific nicotinic receptor (nAChR) antagonist, on cognitive control processes in mice using an operant strategy switching task. Brain-derived neurotrophic factor (BDNF) modulates synaptic transmission in frontostriatal circuits, and these circuits are critical for executive functions. Thus, we examined the effects of mecamylamine-precipitated nicotine withdrawal on prefrontal and striatal BDNF protein expression. Mice undergoing precipitated nicotine withdrawal required more trials to attain strategy switching criterion as compared to the controls. Error analysis indicated that impaired performance in these animals was mostly related to their inability to execute the new strategy. The striatal/prefrontal BDNF ratios robustly increased following precipitated nicotine withdrawal. Moreover, higher BDNF ratios were associated with longer task acquisition. Collectively, our findings illustrate that mecamylamine-induced nicotine withdrawal disrupts cognitive control processes and that these changes are possibly linked to perturbations in frontostriatal BDNF signaling.
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Affiliation(s)
- Vinay Parikh
- Department of Psychology and Neuroscience Program, Temple University, Philadelphia, PA 19122, United States.
| | - Robert D Cole
- Department of Psychology and Neuroscience Program, Temple University, Philadelphia, PA 19122, United States
| | - Purav J Patel
- Department of Psychology and Neuroscience Program, Temple University, Philadelphia, PA 19122, United States
| | - Rachel L Poole
- Department of Psychology and Neuroscience Program, Temple University, Philadelphia, PA 19122, United States
| | - Thomas J Gould
- Department of Psychology and Neuroscience Program, Temple University, Philadelphia, PA 19122, United States
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142
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Rahman S, Engleman EA, Bell RL. Recent Advances in Nicotinic Receptor Signaling in Alcohol Abuse and Alcoholism. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2015; 137:183-201. [PMID: 26810002 PMCID: PMC4754113 DOI: 10.1016/bs.pmbts.2015.10.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Alcohol is the most commonly abused legal substance and alcoholism is a serious public health problem. It is a leading cause of preventable death in the world. The cellular and molecular mechanisms of alcohol reward and addiction are still not well understood. Emerging evidence indicates that unlike other drugs of abuse, such as nicotine, cocaine, or opioids, alcohol targets numerous channel proteins, receptor molecules, and signaling pathways in the brain. Previously, research has identified brain nicotinic acetylcholine receptors (nAChRs), a heterogeneous family of pentameric ligand-gated cation channels expressed in the mammalian brain, as critical molecular targets for alcohol abuse and dependence. Genetic variations encoding nAChR subunits have been shown to increase the vulnerability to develop alcohol dependence. Here, we review recent insights into the rewarding effects of alcohol, as they pertain to different nAChR subtypes, associated signaling molecules, and pathways that contribute to the molecular mechanisms of alcoholism and/or comorbid brain disorders. Understanding these cellular changes and molecular underpinnings may be useful for the advancement of brain nicotinic-cholinergic mechanisms, and will lead to a better translational and therapeutic outcome for alcoholism and/or comorbid conditions.
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Affiliation(s)
- Shafiqur Rahman
- Department of Pharmaceutical Sciences, South Dakota State University, Brookings, South Dakota, USA.
| | - Eric A Engleman
- Department of Psychiatry, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Richard L Bell
- Department of Psychiatry, Indiana University School of Medicine, Indianapolis, Indiana, USA
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Leone FT, Carlsen KH, Folan P, Latzka K, Munzer A, Neptune E, Pakhale S, Sachs DPL, Samet J, Upson D, White A. An Official American Thoracic Society Research Statement: Current Understanding and Future Research Needs in Tobacco Control and Treatment. Am J Respir Crit Care Med 2015; 192:e22-41. [PMID: 26230245 DOI: 10.1164/rccm.201506-1081st] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
INTRODUCTION Since the mid-20th century, the scientific community has substantially improved its understanding of the worldwide tobacco epidemic. Although significant progress has been made, the sheer enormity and scope of the global problem put it on track to take a billion lives this century. Curbing the epidemic will require maximizing the impact of proven tools as well as the development of new, breakthrough methods to help interrupt the spread of nicotine addiction and reduce the downstream morbidity. METHODS Members of the Tobacco Action Committee of the American Thoracic Society queried bibliographic databases, including Medline, Embase, and the Cochrane Collaborative, to identify primary sources and reviews relevant to the epidemic. Exploded search terms were used to identify evidence, including tobacco, addiction, smoking, cigarettes, nicotine, and smoking cessation. Evidence was consolidated into three thematic areas: (1) determinants of risk, (2) maternal-fetal exposure, and (3) current tobacco users. Expert panel consensus regarding current gaps in understanding and recommendations for future research priorities was generated through iterative discussion. RESULTS Although much has been accomplished, significant gaps in understanding remain. Implementation often lags well behind insight. This report identifies a number of investigative opportunities for significantly reducing the toll of tobacco use, including: (1) the need for novel, nonlinear models of population-based disease control; (2) refinement of "real-world" models of clinical intervention in trial design; and (3) understanding of mechanisms by which intrauterine smoke exposure may lead to persistent, tobacco-related chronic disease. DISCUSSION In the coming era of tobacco research, pooled talent from multiple disciplines will be required to further illuminate the complex social, environmental and biological codeterminants of tobacco dependence.
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Papke RL, Horenstein NA, Stokes C. Nicotinic Activity of Arecoline, the Psychoactive Element of "Betel Nuts", Suggests a Basis for Habitual Use and Anti-Inflammatory Activity. PLoS One 2015; 10:e0140907. [PMID: 26488401 PMCID: PMC4619380 DOI: 10.1371/journal.pone.0140907] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Accepted: 10/01/2015] [Indexed: 01/07/2023] Open
Abstract
Habitual chewing of "betel nut" preparations constitutes the fourth most common human self-administration of a psychoactive substance after alcohol, caffeine, and nicotine. The primary active ingredient in these preparations is arecoline, which comes from the areca nut, the key component of all such preparations. Arecoline is known to be a relatively non-selective muscarinic partial agonist, accounting for many of the overt peripheral and central nervous system effects, but not likely to account for the addictive properties of the drug. We report that arecoline has activity on select nicotinic acetylcholine receptor (nAChR) subtypes, including the two classes of nAChR most related to the addictive properties of nicotine: receptors containing α4 and β2 subunits and those which also contain α6 and β3 subunits. Arecoline is a partial agonist with about 6-10% efficacy for the α4* and α6* receptors expressed in Xenopus oocytes. Additionally, arecoline is a silent agonist of α7 nAChR; while it does not activate α7 receptors when applied alone, it produces substantial activation when co-applied with the positive allosteric modulator PNU-120696. Some α7 silent agonists are effective inhibitors of inflammation, which might account for anti-inflammatory effects of arecoline. Arecoline's activity on nAChR associated with addiction may account for the habitual use of areca nut preparations in spite of the well-documented risk to personal health associated with oral diseases and cancer. The common link between betel and tobacco suggests that partial agonist therapies with cytisine or the related compound varenicline may also be used to aid betel cessation attempts.
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Affiliation(s)
- Roger L. Papke
- Department of Pharmacology and Therapeutics, University of Florida, PO Box 100267 Gainesville, Florida, 32610–0267, United States of America
| | - Nicole A. Horenstein
- Department of Chemistry, University of Florida, PO Box 117200, Gainesville, Florida, 32611–7200, United States of America
| | - Clare Stokes
- Department of Pharmacology and Therapeutics, University of Florida, PO Box 100267 Gainesville, Florida, 32610–0267, United States of America
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Wang J, Kuryatov A, Jin Z, Norleans J, Kamenecka TM, Kenny PJ, Lindstrom J. A Novel α2/α4 Subtype-selective Positive Allosteric Modulator of Nicotinic Acetylcholine Receptors Acting from the C-tail of an α Subunit. J Biol Chem 2015; 290:28834-46. [PMID: 26432642 DOI: 10.1074/jbc.m115.676551] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Indexed: 12/30/2022] Open
Abstract
Positive allosteric modulators (PAMs) of nicotinic acetylcholine receptors (nAChR) are important therapeutic candidates as well as valuable research tools. We identified a novel type II PAM, (R)-7-bromo-N-(piperidin-3-yl)benzo[b]thiophene-2-carboxamide (Br-PBTC), which both increases activation and reactivates desensitized nAChRs. This compound increases acetylcholine-evoked responses of α2* and α4* nAChRs but is without effect on α3* or α6* nAChRs (* indicates the presence of other nAChR subunits). Br-BPTC acts from the C-terminal extracellular sequences of α4 subunits, which is also a PAM site for steroid hormone estrogens such as 17β-estradiol. Br-PBTC is much more potent than estrogens. Like 17β-estradiol, the non-steroid Br-PBTC only requires one α4 subunit to potentiate nAChR function, and its potentiation is stronger with more α4 subunits. This feature enables Br-BPTC to potentiate activation of (α4β2)(α6β2)β3 but not (α6β2)2β3 nAChRs. Therefore, this compound is potentially useful in vivo for determining functions of different α6* nAChR subtypes. Besides activation, Br-BPTC affects desensitization of nAChRs induced by sustained exposure to agonists. After minutes of exposure to agonists, Br-PBTC reactivated short term desensitized nAChRs that have at least two α4 subunits but not those with only one. Three α4 subunits were required for Br-BPTC to reactivate long term desensitized nAChRs. These data suggest that higher PAM occupancy promotes channel opening more efficiently and overcomes short and long term desensitization. This C-terminal extracellular domain could be a target for developing subtype or state-selective drugs for nAChRs.
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Affiliation(s)
- Jingyi Wang
- From the Department of Neuroscience, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Alexander Kuryatov
- From the Department of Neuroscience, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Zhuang Jin
- Department of Molecular Therapeutics, Scripps Research Institute, Scripps, Florida 33458, and
| | - Jack Norleans
- From the Department of Neuroscience, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Theodore M Kamenecka
- Department of Molecular Therapeutics, Scripps Research Institute, Scripps, Florida 33458, and
| | - Paul J Kenny
- Department of Pharmacology and Systems Therapeutics, Icahn School of Medicine at Mount Sinai, New York, New York 10029
| | - Jon Lindstrom
- From the Department of Neuroscience, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104,
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146
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Locker AR, Marks MJ, Kamens HM, Klein LC. Exposure to nicotine increases nicotinic acetylcholine receptor density in the reward pathway and binge ethanol consumption in C57BL/6J adolescent female mice. Brain Res Bull 2015; 123:13-22. [PMID: 26428091 DOI: 10.1016/j.brainresbull.2015.09.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Revised: 09/23/2015] [Accepted: 09/24/2015] [Indexed: 10/23/2022]
Abstract
Nearly 80% of adult smokers begin smoking during adolescence. Binge alcohol consumption is also common during adolescence. Past studies report that nicotine and ethanol activate dopamine neurons in the reward pathway and may increase synaptic levels of dopamine in the nucleus accumbens through nicotinic acetylcholine receptor (nAChR) stimulation. Activation of the reward pathway during adolescence through drug use may produce neural alterations affecting subsequent drug consumption. Consequently, the effect of nicotine exposure on binge alcohol consumption was examined along with an assessment of the neurobiological underpinnings that drive adolescent use of these drugs. Adolescent C57BL/6J mice (postnatal days 35-44) were exposed to either water or nicotine (200μg/ml) for ten days. On the final four days, ethanol intake was examined using the drinking-in-the-dark paradigm. Nicotine-exposed mice consumed significantly more ethanol and displayed higher blood ethanol concentrations than did control mice. Autoradiographic analysis of nAChR density revealed higher epibatidine binding in frontal cortical regions in mice exposed to nicotine and ethanol compared to mice exposed to ethanol only. These data show that nicotine exposure during adolescence increases subsequent binge ethanol consumption, and may affect the number of nAChRs in regions of the brain reward pathway, specifically the frontal cortex.
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Affiliation(s)
- Alicia R Locker
- Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Morgantown, WV 26505, United States; The Pennsylvania State University, Department of Biobehavioral Health, University Park, PA 16802, United States.
| | - Michael J Marks
- University of Colorado Boulder, Institute for Behavioral Genetics and Department of Psychology and Neuroscience, Boulder, CO 80303, United States
| | - Helen M Kamens
- The Pennsylvania State University, Department of Biobehavioral Health, University Park, PA 16802, United States
| | - Laura Cousino Klein
- The Pennsylvania State University, Department of Biobehavioral Health, University Park, PA 16802, United States
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147
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Korpi ER, den Hollander B, Farooq U, Vashchinkina E, Rajkumar R, Nutt DJ, Hyytiä P, Dawe GS. Mechanisms of Action and Persistent Neuroplasticity by Drugs of Abuse. Pharmacol Rev 2015; 67:872-1004. [DOI: 10.1124/pr.115.010967] [Citation(s) in RCA: 101] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
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148
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Berg KM, Piper ME, Smith SS, Fiore MC, Jorenby DE. Defining and predicting short-term alcohol use changes during a smoking cessation attempt. Addict Behav 2015; 48:52-7. [PMID: 25997014 DOI: 10.1016/j.addbeh.2015.04.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Revised: 02/17/2015] [Accepted: 04/10/2015] [Indexed: 10/23/2022]
Abstract
INTRODUCTION Alcohol and nicotine are commonly used substances in the U.S., with significant impacts on health. Using both substances concurrently impacts quit attempts. While studies have sought to examine changes in alcohol use co-occurring with tobacco cessation, results have not been consistent. Understanding these changes has clinical implications. The objective of this study is to identify changes in alcohol consumption that occur following tobacco cessation, as well as predictors of alcohol use patterns following a smoking cessation attempt. METHODS A secondary analysis of a randomized, placebo-controlled trial evaluating the efficacy of five tobacco cessation pharmacotherapies. Participants (N=1301) reported their smoking and alcohol consumption daily for two weeks prior to, and two weeks after, the target quit date (TQD). RESULTS Generally, alcohol use decreased post-TQD. Smokers who reported less pre-quit alcohol use, as well as smokers who were female, non-white, and had a history of alcohol dependence tended to use less alcohol post-quit. Pre- and post-quit alcohol use were more strongly related among men and among those without a history of alcohol dependence. CONCLUSIONS For most smokers alcohol use decreased following smoking cessation. These results suggest that the expectation should be of decreased alcohol use post cessation. However, attention may be warranted for those who drink higher amounts of alcohol pre-cessation because they may be more likely to drink more in the post-quit period which may influence smoking cessation success.
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149
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Jaikhan P, Boonyarat C, Arunrungvichian K, Taylor P, Vajragupta O. Design and Synthesis of Nicotinic Acetylcholine Receptor Antagonists and their Effect on Cognitive Impairment. Chem Biol Drug Des 2015; 87:39-56. [DOI: 10.1111/cbdd.12627] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Revised: 07/03/2015] [Accepted: 07/15/2015] [Indexed: 12/13/2022]
Affiliation(s)
- Pattaporn Jaikhan
- Center of Excellence for Innovation in Drug Design and Discovery; Faculty of Pharmacy; Mahidol University; 447 Sri-Ayudya Road Bangkok 10400 Thailand
| | - Chantana Boonyarat
- Department of Pharmaceutical Chemistry; Faculty of Pharmaceutical Science; KhonKaen University; KhonKaen 4000 Thailand
| | - Kuntarat Arunrungvichian
- Center of Excellence for Innovation in Drug Design and Discovery; Faculty of Pharmacy; Mahidol University; 447 Sri-Ayudya Road Bangkok 10400 Thailand
- Department of Pharmacology; Skaggs School of Pharmacy and Pharmaceutical Sciences; University of California; San Diego 9500 Gilman Drive La Jolla CA 92093-0657 USA
| | - Palmer Taylor
- Department of Pharmacology; Skaggs School of Pharmacy and Pharmaceutical Sciences; University of California; San Diego 9500 Gilman Drive La Jolla CA 92093-0657 USA
| | - Opa Vajragupta
- Center of Excellence for Innovation in Drug Design and Discovery; Faculty of Pharmacy; Mahidol University; 447 Sri-Ayudya Road Bangkok 10400 Thailand
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150
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Kichko TI, Kobal G, Reeh PW. Cigarette smoke has sensory effects through nicotinic and TRPA1 but not TRPV1 receptors on the isolated mouse trachea and larynx. Am J Physiol Lung Cell Mol Physiol 2015; 309:L812-20. [PMID: 26472811 PMCID: PMC4609941 DOI: 10.1152/ajplung.00164.2015] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Accepted: 08/16/2015] [Indexed: 02/08/2023] Open
Abstract
Cigarette smoke (CS) exposes chemosensory nerves in the airways to a multitude of chemicals, some acting through the irritant receptors TRPV1 and TRPA1 but potentially also through nicotinic acetylcholine receptors (nAChR). Our aim was to characterize the differences in sensory neuronal effects of CS, gas phase, and particulate matter as well as of typical constituents, such as nicotine and reactive carbonyls. Isolated mouse trachea and larynx were employed to measure release of calcitonin gene-related peptide (CGRP) as an index of sensory neuron activation evoked by CS, by filtered CS gas phase essentially free of nicotine, and by dilute total particulate matter (TPM) containing defined nicotine concentrations. With CS stimulation of the superfused trachea, TRPV1 null mutants showed about the same large responses as wild-type mice, whereas both TRPA1(-/-) and double knockouts exhibited 80% reduction; the retained 20% response was abolished by mecamylamine (10 μM), indicating a distinct contribution of nAChRs. These phenotypes were accentuated by using TPM to stimulate the immersed trachea; 50% of response was retained in TRPA1(-/-) and abolished by mecamylamine. In contrast, the gas phase acted like a sheer TRPA1 agonist, consistent with its composition, among other compounds, of volatile reactive carbonyls like formaldehyde and acrolein. In the trachea, the gas phase and CS were equally effective in releasing CGRP, whereas the larynx showed much larger CS than gas phase responses. Thus nicotinic receptors contribute to the sensory effects of cigarette smoke on the trachea, which are dominated by TRPA1. How this translates to human perception affords future research.
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Affiliation(s)
- Tatjana I Kichko
- Institute of Physiology and Pathophysiology, Friedrich-Alexander-University of Erlangen-Nürnberg, Erlangen, Germany; and
| | - Gerd Kobal
- Altria Client Services Inc., Richmond, Virginia
| | - Peter W Reeh
- Institute of Physiology and Pathophysiology, Friedrich-Alexander-University of Erlangen-Nürnberg, Erlangen, Germany; and
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