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A Novel CaMKII Inhibitory Peptide Blocks Relapse to Morphine Seeking by Influencing Synaptic Plasticity in the Nucleus Accumbens Shell. Brain Sci 2022; 12:brainsci12080985. [PMID: 35892425 PMCID: PMC9394410 DOI: 10.3390/brainsci12080985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 07/12/2022] [Accepted: 07/23/2022] [Indexed: 12/04/2022] Open
Abstract
Drugs of abuse cause enduring functional disorders in the brain reward circuits, leading to cravings and compulsive behavior. Although people may rehabilitate by detoxification, there is a high risk of relapse. Therefore, it is crucial to illuminate the mechanisms of relapse and explore the therapeutic strategies for prevention. In this research, by using an animal model of morphine self-administration in rats and a whole-cell patch–clamp in brain slices, we found changes in synaptic plasticity in the nucleus accumbens (NAc) shell were involved in the relapse to morphine-seeking behavior. Compared to the controls, the amplitude of long-term depression (LTD) induced in the medium spiny neurons increased after morphine self-administration was established, recovered after the behavior was extinguished, and increased again during the relapse induced by morphine priming. Intravenous injection of MA, a new peptide obtained by modifying Ca2+/calmodulin-dependent protein kinase II (CaMKII) inhibitor “myr-AIP”, decreased CaMKII activity in the NAc shell and blocked the reinstatement of morphine-seeking behavior without influence on the locomotor activity. Moreover, LTD was absent in the NAc shell of the MA-pretreated rats, whereas it was robust in the saline controls in which morphine-seeking behavior was reinstated. These results indicate that CaMKII regulates morphine-seeking behavior through its involvement in the change of synaptic plasticity in the NAc shell during the relapse, and MA may be of great value in the clinical treatment of relapse to opioid seeking.
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Blazquez-Llorca L, Miguéns M, Montero-Crespo M, Selvas A, Gonzalez-Soriano J, Ambrosio E, DeFelipe J. 3D Synaptic Organization of the Rat CA1 and Alterations Induced by Cocaine Self-Administration. Cereb Cortex 2021; 31:1927-1952. [PMID: 33253368 PMCID: PMC7945021 DOI: 10.1093/cercor/bhaa331] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 09/10/2020] [Accepted: 10/12/2020] [Indexed: 12/24/2022] Open
Abstract
The hippocampus plays a key role in contextual conditioning and has been proposed as an important component of the cocaine addiction brain circuit. To gain knowledge about cocaine-induced alterations in this circuit, we used focused ion beam milling/scanning electron microscopy to reveal and quantify the three-dimensional synaptic organization of the neuropil of the stratum radiatum of the rat CA1, under normal circumstances and after cocaine-self administration (SA). Most synapses are asymmetric (excitatory), macular-shaped, and in contact with dendritic spine heads. After cocaine-SA, the size and the complexity of the shape of both asymmetric and symmetric (inhibitory) synapses increased but no changes were observed in the synaptic density. This work constitutes the first detailed report on the 3D synaptic organization in the stratum radiatum of the CA1 field of cocaine-SA rats. Our data contribute to the elucidation of the normal and altered synaptic organization of the hippocampus, which is crucial for better understanding the neurobiological mechanisms underlying cocaine addiction.
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Affiliation(s)
- L Blazquez-Llorca
- Departamento de Psicobiología, Facultad de Psicología, Universidad Nacional de Educación a Distancia (UNED), 28040 Madrid, Spain.,Laboratorio Cajal de Circuitos Corticales, Centro de Tecnología Biomédica, Universidad Politécnica de Madrid, 28223 Madrid, Spain.,Sección Departamental de Anatomía y Embriología (Veterinaria), Facultad de Veterinaria, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - M Miguéns
- Departamento de Psicología Básica I, Facultad de Psicología, Universidad Nacional de Educación a Distancia (UNED), 28040 Madrid, Spain
| | - M Montero-Crespo
- Laboratorio Cajal de Circuitos Corticales, Centro de Tecnología Biomédica, Universidad Politécnica de Madrid, 28223 Madrid, Spain.,Instituto Cajal, Consejo Superior de Investigaciones Científicas, 28002 Madrid, Spain
| | - A Selvas
- Departamento de Psicobiología, Facultad de Psicología, Universidad Nacional de Educación a Distancia (UNED), 28040 Madrid, Spain
| | - J Gonzalez-Soriano
- Sección Departamental de Anatomía y Embriología (Veterinaria), Facultad de Veterinaria, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - E Ambrosio
- Departamento de Psicobiología, Facultad de Psicología, Universidad Nacional de Educación a Distancia (UNED), 28040 Madrid, Spain
| | - J DeFelipe
- Laboratorio Cajal de Circuitos Corticales, Centro de Tecnología Biomédica, Universidad Politécnica de Madrid, 28223 Madrid, Spain.,Instituto Cajal, Consejo Superior de Investigaciones Científicas, 28002 Madrid, Spain
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Castilla-Ortega E, Ladrón de Guevara-Miranda D, Serrano A, Pavón FJ, Suárez J, Rodríguez de Fonseca F, Santín LJ. The impact of cocaine on adult hippocampal neurogenesis: Potential neurobiological mechanisms and contributions to maladaptive cognition in cocaine addiction disorder. Biochem Pharmacol 2017; 141:100-117. [DOI: 10.1016/j.bcp.2017.05.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Accepted: 05/03/2017] [Indexed: 12/14/2022]
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Crocker CE, Purdon SE, Hanstock CC, Lakusta B, Seres P, Tibbo PG. Enduring changes in brain metabolites and executive functioning in abstinent cocaine users. Drug Alcohol Depend 2017; 178:435-442. [PMID: 28710968 DOI: 10.1016/j.drugalcdep.2017.04.034] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Revised: 03/27/2017] [Accepted: 04/27/2017] [Indexed: 10/19/2022]
Abstract
BACKGROUND There is a paucity of data connecting the metabolic and cognitive functioning of abstinent cocaine users. This is a pressing public health concern as approximately 1% of the Canadian population and 0.4% of the global population is estimated to have used cocaine in the past year. METHODS Our clinical study compared the in vivo neurochemical profiles in the prefrontal cortex to cognitive tests associated with the same region in 21 moderate term abstinent cocaine users (average 187days abstinent, range 15-1432days), and 30 healthy controls using 3T 1H MRS. RESULTS The abstinent cocaine users exhibited a 10% decrease in N-acetylaspartate (NAA) relative to healthy control subjects (p<0.01, Cohen's d=1.15). When subdivided by method of administration, a significant decrease in glutamate levels in former crack smokers compared to healthy controls (p<0.05) was observed, this decrease was not present in powder users. Abstinent users were significantly worse than healthy controls on the Trail Making Test B (p<0.05), and performance on this task was inversely related to NAA levels (p<0.05). Abstinent cocaine users showed deficits in the Wisconsin card sorting test with failures to maintain set (p<0.01). CONCLUSIONS Our work suggests that there are subtle but important changes in the brain that remain even with the moderate term cessation of cocaine use.
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Affiliation(s)
- Candice E Crocker
- Department of Psychiatry, Dalhousie University, Halifax, Nova Scotia, Canada; Department of Diagnostic Radiology, Nova Scotia Health Authority, Halifax, Nova Scotia, Canada.
| | - Scot E Purdon
- Department of Psychiatry, University of Alberta, Edmonton, Alberta, Canada
| | | | - Bonnie Lakusta
- Department of Psychiatry, University of Alberta, Edmonton, Alberta, Canada
| | - Peter Seres
- Department of Biomedical Engineering, University of Alberta, Edmonton, Alberta, Canada
| | - Philip G Tibbo
- Department of Psychiatry, Dalhousie University, Halifax, Nova Scotia, Canada; Department of Psychiatry, University of Alberta, Edmonton, Alberta, Canada
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Compound Schisandra-Ginseng-Notoginseng-Lycium Extract Ameliorates Scopolamine-Induced Learning and Memory Disorders in Mice. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2017; 2017:8632016. [PMID: 28814961 PMCID: PMC5549506 DOI: 10.1155/2017/8632016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Revised: 05/05/2017] [Accepted: 06/07/2017] [Indexed: 12/14/2022]
Abstract
Schisandra, Ginseng, Notoginseng, and Lycium barbarum are traditional Chinese medicinal plants sharing cognitive-enhancing properties. To design a functional food to improve memory, we prepared a compound Schisandra-Ginseng-Notoginseng-Lycium (CSGNL) extract and investigated its effect on scopolamine-induced learning and memory loss in mice. To optimize the dose ratios of the four herbal extracts in CSGNL, orthogonal experiments were performed. Mice were administered CSGNL by gavage once a day for 30 days and then mouse learning and memory were evaluated by Morris water maze and step-through tests. The mechanisms of CSGNL improving learning and memory were investigated by assaying acetylcholine (ACh) levels and choline acetyltransferase (ChAT) and acetylcholinesterase (AChE) activities in the brain tissues of treated mice. The results showed that CSGNL significantly ameliorated scopolamine-induced learning and memory impairment, at least in part, by modulating ACh levels and ChAT and AChE activities in the mouse brain. Our data support the use of CSGNL as a functional food for learning and memory enhancement.
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Selvas A, Coria SM, Kastanauskaite A, Fernaud-Espinosa I, DeFelipe J, Ambrosio E, Miguéns M. Rat-strain dependent changes of dendritic and spine morphology in the hippocampus after cocaine self-administration. Addict Biol 2017; 22:78-92. [PMID: 26332690 DOI: 10.1111/adb.12294] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Revised: 07/15/2015] [Accepted: 07/15/2015] [Indexed: 12/24/2022]
Abstract
We previously showed that cocaine self-administration increases spine density in CA1 hippocampal neurons in Lewis (LEW) but not in Fischer 344 (F344) rats. Dendritic spine morphology is intimately related to its function. Thus, we conducted a 3D morphological analysis of CA1 dendrites and dendritic spines in these two strains of rats. Strain-specific differences were observed prior to cocaine self-administration: LEW rats had significantly larger dendritic diameters but lower spine density than the F344 strain. After cocaine self-administration, proximal dendritic volume, dendritic surface area and spine density were increased in LEW rats, where a higher percentage of larger spines were also observed. In addition, we found a strong positive correlation between dendritic volume and spine morphology, and a moderate correlation between dendritic volume and spine density in cocaine self-administered LEW rats, an effect that was not evident in any other condition. By contrast, after cocaine self-administration, F334 rats showed decreased spine head volumes. Our findings suggest that genetic differences could play a key role in the structural plasticity induced by cocaine in CA1 pyramidal neurons. These cocaine-induced alterations could be related to differences in the memory processing of drug reward cues that could potentially explain differential individual vulnerability to cocaine addiction.
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Affiliation(s)
- Abraham Selvas
- Departamento de Psicobiología, Facultad de Psicología; Universidad Nacional de Educación a Distancia, (UNED); Spain
- Laboratorio Cajal de Circuitos Corticales (CTB); Universidad Politécnica de Madrid; Spain
| | - Santiago M. Coria
- Departamento de Psicobiología, Facultad de Psicología; Universidad Nacional de Educación a Distancia, (UNED); Spain
| | - Asta Kastanauskaite
- Laboratorio Cajal de Circuitos Corticales (CTB); Universidad Politécnica de Madrid; Spain
| | | | - Javier DeFelipe
- Laboratorio Cajal de Circuitos Corticales (CTB); Universidad Politécnica de Madrid; Spain
- Instituto Cajal (CSIC); Spain
- CIBERNED; Spain
| | - Emilio Ambrosio
- Departamento de Psicobiología, Facultad de Psicología; Universidad Nacional de Educación a Distancia, (UNED); Spain
| | - Miguel Miguéns
- Departamento de Psicología Básica I, Facultad de Psicología; Universidad Nacional de Educación a Distancia (UNED); Spain
- Laboratorio Cajal de Circuitos Corticales (CTB); Universidad Politécnica de Madrid; Spain
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Blanco E, Galeano P, Palomino A, Pavón FJ, Rivera P, Serrano A, Alen F, Rubio L, Vargas A, Castilla-Ortega E, Decara J, Bilbao A, de Fonseca FR, Suárez J. Cocaine-induced behavioral sensitization decreases the expression of endocannabinoid signaling-related proteins in the mouse hippocampus. Eur Neuropsychopharmacol 2016; 26:477-92. [PMID: 26811312 DOI: 10.1016/j.euroneuro.2015.12.040] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2015] [Revised: 12/15/2015] [Accepted: 12/29/2015] [Indexed: 02/02/2023]
Abstract
In the reward mesocorticolimbic circuits, the glutamatergic and endocannabinoid systems are implicated in neurobiological mechanisms underlying cocaine addiction. However, the involvement of both systems in the hippocampus, a critical region to process relational information relevant for encoding drug-associated memories, in cocaine-related behaviors remains unknown. In the present work, we studied whether the hippocampal gene/protein expression of relevant glutamate signaling components, including glutamate-synthesizing enzymes and metabotropic and ionotropic receptors, and the hippocampal gene/protein expression of cannabinoid type 1 (CB1) receptor and endocannabinoid metabolic enzymes were altered following acute and/or repeated cocaine administration resulting in conditioned locomotion and locomotor sensitization. Results showed that acute cocaine administration induced an overall down-regulation of glutamate-related gene expression and, specifically, a low phosphorylation level of GluA1. In contrast, locomotor sensitization to cocaine produced an up-regulation of several glutamate receptor-related genes and, specifically, an increased protein expression of the GluN1 receptor subunit. Regarding the endocannabinoid system, acute and repeated cocaine administration were associated with an increased gene/protein expression of CB1 receptors and a decreased gene/protein expression of the endocannabinoid-synthesis enzymes N-acyl phosphatidylethanolamine D (NAPE-PLD) and diacylglycerol lipase alpha (DAGLα). These changes resulted in an overall decrease in endocannabinoid synthesis/degradation ratios, especially NAPE-PLD/fatty acid amide hydrolase and DAGLα/monoacylglycerol lipase, suggesting a reduced endocannabinoid production associated with a compensatory up-regulation of CB1 receptor. Overall, these findings suggest that repeated cocaine administration resulting in locomotor sensitization induces a down-regulation of the endocannabinoid signaling that could contribute to the specifically increased GluN1 expression observed in the hippocampus of cocaine-sensitized mice.
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Affiliation(s)
- Eduardo Blanco
- Unidad de Gestión Clínica de Salud Mental, Instituto de Investigación Biomédica de Málaga, Hospital Regional Universitario de Málaga, Universidad de Málaga, Avda. Carlos Haya 82, 29010, Málaga, Spain; Departament de Pedagogia i Psicologia, Facultat d׳Educació, Psicologia i Treball Social, Universitat de Lleida, Avda. de l'Estudi General 4, 25001, Lleida, Spain.
| | - Pablo Galeano
- Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA-CONICET), Fundación Instituto Leloir, Avda. Patricias Argentinas 435, C1405BWE Ciudad Autónoma de Buenos Aires, Argentina.
| | - Ana Palomino
- Unidad de Gestión Clínica de Salud Mental, Instituto de Investigación Biomédica de Málaga, Hospital Regional Universitario de Málaga, Universidad de Málaga, Avda. Carlos Haya 82, 29010, Málaga, Spain.
| | - Francisco J Pavón
- Unidad de Gestión Clínica de Salud Mental, Instituto de Investigación Biomédica de Málaga, Hospital Regional Universitario de Málaga, Universidad de Málaga, Avda. Carlos Haya 82, 29010, Málaga, Spain.
| | - Patricia Rivera
- Unidad de Gestión Clínica de Salud Mental, Instituto de Investigación Biomédica de Málaga, Hospital Regional Universitario de Málaga, Universidad de Málaga, Avda. Carlos Haya 82, 29010, Málaga, Spain.
| | - Antonia Serrano
- Unidad de Gestión Clínica de Salud Mental, Instituto de Investigación Biomédica de Málaga, Hospital Regional Universitario de Málaga, Universidad de Málaga, Avda. Carlos Haya 82, 29010, Málaga, Spain.
| | - Francisco Alen
- Unidad de Gestión Clínica de Salud Mental, Instituto de Investigación Biomédica de Málaga, Hospital Regional Universitario de Málaga, Universidad de Málaga, Avda. Carlos Haya 82, 29010, Málaga, Spain.
| | - Leticia Rubio
- Departamento de Anatomía y Medicina Legal, Universidad de Málaga, Campus de Teatinos s/n, 29071 Málaga, Spain.
| | - Antonio Vargas
- Unidad de Gestión Clínica de Salud Mental, Instituto de Investigación Biomédica de Málaga, Hospital Regional Universitario de Málaga, Universidad de Málaga, Avda. Carlos Haya 82, 29010, Málaga, Spain.
| | - Estela Castilla-Ortega
- Unidad de Gestión Clínica de Salud Mental, Instituto de Investigación Biomédica de Málaga, Hospital Regional Universitario de Málaga, Universidad de Málaga, Avda. Carlos Haya 82, 29010, Málaga, Spain.
| | - Juan Decara
- Unidad de Gestión Clínica de Salud Mental, Instituto de Investigación Biomédica de Málaga, Hospital Regional Universitario de Málaga, Universidad de Málaga, Avda. Carlos Haya 82, 29010, Málaga, Spain.
| | - Ainhoa Bilbao
- Institute of Psychopharmacology, Central Institute of Mental Health, Faculty of Medicine Mannheim, University of Heidelberg, J5, 68159 Mannheim, Heidelberg, Germany.
| | - Fernando Rodríguez de Fonseca
- Unidad de Gestión Clínica de Salud Mental, Instituto de Investigación Biomédica de Málaga, Hospital Regional Universitario de Málaga, Universidad de Málaga, Avda. Carlos Haya 82, 29010, Málaga, Spain.
| | - Juan Suárez
- Unidad de Gestión Clínica de Salud Mental, Instituto de Investigación Biomédica de Málaga, Hospital Regional Universitario de Málaga, Universidad de Málaga, Avda. Carlos Haya 82, 29010, Málaga, Spain.
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Wu HF, Yen HJ, Huang CC, Lee YC, Wu SZ, Lee TS, Lin HC. Soluble epoxide hydrolase inhibitor enhances synaptic neurotransmission and plasticity in mouse prefrontal cortex. J Biomed Sci 2015; 22:94. [PMID: 26494028 PMCID: PMC4618874 DOI: 10.1186/s12929-015-0202-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2015] [Accepted: 10/09/2015] [Indexed: 12/29/2022] Open
Abstract
Background The soluble epoxide hydrolase (sEH) is an important enzyme chiefly involved in the metabolism of fatty acid signaling molecules termed epoxyeicosatrienoic acids (EETs). sEH inhibition (sEHI) has proven to be protective against experimental cerebral ischemia, and it is emerging as a therapeutic target for prevention and treatment of ischemic stroke. However, the role of sEH on synaptic function in the central nervous system is still largely unknown. This study aimed to test whether sEH C-terminal epoxide hydrolase inhibitor, 12-(3-adamantan-1-yl-ureido) dodecanoic acid (AUDA) affects basal synaptic transmission and synaptic plasticity in the prefrontal cortex area (PFC). Whole cell and extracellular recording examined the miniature excitatory postsynaptic currents (mEPSCs) and field excitatory postsynaptic potentials (fEPSPs); Western Blotting determined the protein levels of glutamate receptors and ERK phosphorylation in acute medial PFC slices. Results Application of the sEH C-terminal epoxide hydrolase inhibitor, AUDA significantly increased the amplitude of mEPSCs and fEPSPs in prefrontal cortex neurons, while additionally enhancing long term potentiation (LTP). Western Blotting demonstrated that AUDA treatment increased the expression of the N-methyl-D-aspartate receptor (NMDA) subunits NR1, NR2A, NR2B; the α-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor subunits GluR1, GluR2, and ERK phosphorylation. Conclusions Inhibition of sEH induced an enhancement of PFC neuronal synaptic neurotransmission. This enhancement of synaptic neurotransmission is associated with an enhanced postsynaptic glutamatergic receptor and postsynaptic glutamatergic receptor mediated synaptic LTP. LTP is enhanced via ERK phosphorylation resulting from the delivery of glutamate receptors into the PFC by post-synapse by treatment with AUDA. These findings provide a possible link between synaptic function and memory processes.
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Affiliation(s)
- Han-Fang Wu
- Institute and Department of Physiology, School of Medicine, National Yang-Ming University, Taipei, 11221, Taiwan
| | - Hsin-Ju Yen
- Institute and Department of Physiology, School of Medicine, National Yang-Ming University, Taipei, 11221, Taiwan
| | - Chi-Chen Huang
- Ph.D. Program for Neural Regenerative Medicine, College of Medical Science and Technology, Taipei Medical University, Taipei, 11031, Taiwan.,Center for Neurotrauma and Neuroregeneration, Taipei Medical University, Taipei, 11031, Taiwan
| | - Yi-Chao Lee
- Ph.D. Program for Neural Regenerative Medicine, College of Medical Science and Technology, Taipei Medical University, Taipei, 11031, Taiwan.,Center for Neurotrauma and Neuroregeneration, Taipei Medical University, Taipei, 11031, Taiwan
| | - Su-Zhen Wu
- Department of Anesthesiology, Chi-Mei Medical Center, Tainan, Taiwan
| | - Tzong-Shyuan Lee
- Institute and Department of Physiology, School of Medicine, National Yang-Ming University, Taipei, 11221, Taiwan.,Brain Research Center, National Yang-Ming University, Taipei, 11221, Taiwan
| | - Hui-Ching Lin
- Institute and Department of Physiology, School of Medicine, National Yang-Ming University, Taipei, 11221, Taiwan. .,Ph.D. Program for Neural Regenerative Medicine, College of Medical Science and Technology, Taipei Medical University, Taipei, 11031, Taiwan. .,Brain Research Center, National Yang-Ming University, Taipei, 11221, Taiwan.
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Iñiguez SD, Riggs LM, Nieto SJ, Wright KN, Zamora NN, Cruz B, Zavala AR, Robison AJ, Mazei-Robison MS. Fluoxetine exposure during adolescence increases preference for cocaine in adulthood. Sci Rep 2015; 5:15009. [PMID: 26449406 PMCID: PMC4598853 DOI: 10.1038/srep15009] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Accepted: 09/14/2015] [Indexed: 01/24/2023] Open
Abstract
Currently, there is a high prevalence of antidepressant prescription rates within juvenile populations, yet little is known about the potential long-lasting consequences of such treatments, particularly on subsequent responses to drugs of abuse. To address this issue at the preclinical level, we examined whether adolescent exposure to fluoxetine (FLX), a selective serotonin reuptake inhibitor, results in changes to the sensitivity of the rewarding properties of cocaine in adulthood. Separate groups of male c57bl/6 mice were exposed to FLX (0 or 20 mg/kg) for 15 consecutive days either during adolescence (postnatal days [PD] 35–49) or adulthood (PD 65–79). Twenty-one days after FLX treatment, behavioral responsivity to cocaine (0, 2.5, 5, 10, or 20 mg/kg) conditioned place preference was assessed. Our data shows that mice pretreated with FLX during adolescence, but not during adulthood, display an enhanced dose-dependent preference to the environment paired with cocaine (5 or 10 mg/kg) when compared to age-matched saline pretreated controls. Taken together, our findings suggest that adolescent exposure to FLX increases sensitivity to the rewarding properties of cocaine, later in life.
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Affiliation(s)
- Sergio D Iñiguez
- Department of Psychology, The University of Texas at El Paso, El Paso, TX, USA.,Department of Psychology, California State University, San Bernardino, CA, USA
| | - Lace M Riggs
- Department of Psychology, California State University, San Bernardino, CA, USA
| | - Steven J Nieto
- Department of Psychology, California State University, San Bernardino, CA, USA
| | | | - Norma N Zamora
- Department of Psychology, California State University, San Bernardino, CA, USA
| | - Bryan Cruz
- Department of Psychology, The University of Texas at El Paso, El Paso, TX, USA
| | - Arturo R Zavala
- Department of Psychology, California State University, Long Beach, CA, USA
| | - Alfred J Robison
- Department of Physiology, Michigan State University, Michigan, MI, USA
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