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Dong YG, Gan Y, Fu Y, Shi H, Dai S, Yu R, Li X, Zhang K, Wang F, Yuan TF, Dong Y. Treadmill exercise training inhibits morphine CPP by reversing morphine effects on GABA neurotransmission in D2-MSNs of the accumbens-pallidal pathway in male mice. Neuropsychopharmacology 2024:10.1038/s41386-024-01869-4. [PMID: 38714787 DOI: 10.1038/s41386-024-01869-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2024] [Revised: 04/09/2024] [Accepted: 04/15/2024] [Indexed: 05/10/2024]
Abstract
Relapse is a major challenge in the treatment of drug addiction, and exercise has been shown to decrease relapse to drug seeking in animal models. However, the neural circuitry mechanisms by which exercise inhibits morphine relapse remain unclear. In this study, we report that 4-week treadmill training prevented morphine conditioned place preference (CPP) expression during abstinence by acting through the nucleus accumbens (NAc)-ventral pallidum (VP) pathway. We found that neuronal excitability was reduced in D2-dopamine receptor-expressing medium spiny neurons (D2-MSNs) following repeated exposure to morphine and forced abstinence. Enhancing the excitability of NAc D2-MSNs via treadmill training decreased the expression of morphine CPP. We also found that the effects of treadmill training were mediated by decreasing enkephalin levels and that restoring opioid modulation of GABA neurotransmission in the VP, which increased neurotransmitter release from NAc D2-MSNs to VP, decreased morphine CPP. Our findings suggest the inhibitory effect of exercise on morphine CPP is mediated by reversing morphine-induced neuroadaptations in the NAc-to-VP pathway.
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Affiliation(s)
- Yi-Gang Dong
- Key Laboratory of Adolescent Health Assessment and Exercise Intervention of Ministry of Education, East China Normal University, Shanghai, 200241, China
- College of Physical Education and Health, East China Normal University, Shanghai, 200241, China
| | - Yixia Gan
- Key Laboratory of Adolescent Health Assessment and Exercise Intervention of Ministry of Education, East China Normal University, Shanghai, 200241, China
- College of Physical Education and Health, East China Normal University, Shanghai, 200241, China
| | - Yingmei Fu
- Shanghai Key Laboratory of Psychotic Disorders, Brain Health Institute, National Center for Mental Disorders, Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, Shanghai, 200030, China
| | - Haifeng Shi
- Key Laboratory of Adolescent Health Assessment and Exercise Intervention of Ministry of Education, East China Normal University, Shanghai, 200241, China
- College of Physical Education and Health, East China Normal University, Shanghai, 200241, China
| | - Shanghua Dai
- Key Laboratory of Adolescent Health Assessment and Exercise Intervention of Ministry of Education, East China Normal University, Shanghai, 200241, China
- College of Physical Education and Health, East China Normal University, Shanghai, 200241, China
| | - Ruibo Yu
- Key Laboratory of Adolescent Health Assessment and Exercise Intervention of Ministry of Education, East China Normal University, Shanghai, 200241, China
- College of Physical Education and Health, East China Normal University, Shanghai, 200241, China
| | - Xinyi Li
- Key Laboratory of Adolescent Health Assessment and Exercise Intervention of Ministry of Education, East China Normal University, Shanghai, 200241, China
- College of Physical Education and Health, East China Normal University, Shanghai, 200241, China
| | - Ke Zhang
- Shanghai Key Laboratory of Psychotic Disorders, Brain Health Institute, National Center for Mental Disorders, Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, Shanghai, 200030, China
- Department of Anesthesiology, Affiliated Shanghai Sixth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200233, China
| | - Fanglin Wang
- Key Laboratory of Adolescent Health Assessment and Exercise Intervention of Ministry of Education, East China Normal University, Shanghai, 200241, China
- College of Physical Education and Health, East China Normal University, Shanghai, 200241, China
| | - Ti-Fei Yuan
- Shanghai Key Laboratory of Psychotic Disorders, Brain Health Institute, National Center for Mental Disorders, Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, Shanghai, 200030, China.
| | - Yi Dong
- Key Laboratory of Adolescent Health Assessment and Exercise Intervention of Ministry of Education, East China Normal University, Shanghai, 200241, China.
- College of Physical Education and Health, East China Normal University, Shanghai, 200241, China.
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Towers EB, Kilgore M, Bakhti-Suroosh A, Pidaparthi L, Williams IL, Abel JM, Lynch WJ. Sex differences in the neuroadaptations associated with incubated cocaine-craving: A focus on the dorsomedial prefrontal cortex. Front Behav Neurosci 2023; 16:1027310. [PMID: 36688133 PMCID: PMC9854116 DOI: 10.3389/fnbeh.2022.1027310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Accepted: 12/15/2022] [Indexed: 01/06/2023] Open
Abstract
Introduction Women have a shorter course from initial cocaine use to meeting the criteria for cocaine use disorder as compared to men. Preclinical findings similarly indicate that females develop key features of an addiction-like phenotype faster than males, including an enhanced motivation for cocaine and compulsive use, indicating that this phenomenon is biologically based. The goals of this study were to determine whether cocaine-craving, another key feature of addiction, also develops sooner during withdrawal in females than males and to determine whether there are sex differences in the molecular mechanisms associated with its development focusing on markers known to mediate cocaine-craving in males (i.e., dorsomedial prefrontal cortex, dmPFC, expression of brain-derived neurotrophic factor exon-IV, Bdnf-IV, and NMDA receptor subunits, Grin2a, Grin2b, and Grin1). Methods Cocaine-craving was assessed following extended-access cocaine self-administration and 2, 7, or 14 days of withdrawal using an extinction/cue-induced reinstatement procedure. Tissue was obtained from the dmPFC immediately after reinstatement testing and gene expression changes were analyzed using real-time qPCR. Results In males, cocaine-craving (total extinction and cue-induced reinstatement responding) progressively increased from early to later withdrawal time-points whereas in females, cocaine-craving was already elevated during early withdrawal (after 2 days) and did not further increase at later withdrawal time-points. Levels of cocaine-craving, however, were similar between the sexes. Gene expression changes differed markedly between the sexes such that males showed the expected relapse- and withdrawal-associated changes in Bdnf-IV, Grin2a, Grin2b, and Grin1 expression, but females only showed a modest increase Grin1 expression at the intermediate withdrawal timepoint. Discussion These findings indicate that cocaine-craving is similarly expressed in males and females although the time-course for its incubation appears to be accelerated in females; the molecular mechanisms also likely differ in females versus males.
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Affiliation(s)
- Eleanor Blair Towers
- Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA, United States
- Medical Scientist Training Program, University of Virginia, Charlottesville, VA, United States
| | - Madison Kilgore
- Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA, United States
| | - Anousheh Bakhti-Suroosh
- Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA, United States
| | - Lasyapriya Pidaparthi
- Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA, United States
| | - Ivy L. Williams
- Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA, United States
| | - Jean M. Abel
- Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA, United States
| | - Wendy J. Lynch
- Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA, United States
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3
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Lynch WJ, Bakhti-Suroosh A, Abel JM. Impact of high-access exercise prior to and during early adolescence on later vulnerability to opioid use and relapse in male rats. Transl Psychiatry 2022; 12:425. [PMID: 36192388 PMCID: PMC9529880 DOI: 10.1038/s41398-022-02180-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 09/07/2022] [Accepted: 09/13/2022] [Indexed: 11/15/2022] Open
Abstract
Middle- and high-school athletes participating in certain team sports are at greater risk of opioid misuse and addiction than those who do not. While this risk is thought to be due to increased access to opioids, in this study we explored the possibility that the sensitizing effects of discontinued high-intensity exercise may also contribute. Specifically, using male rat models with fentanyl, we tested the hypothesis that high-access exercise (24 h/day access to a running wheel) during pre/early adolescence (two weeks, postnatal-day 24-37) would enhance vulnerability to opioid use and relapse during late adolescence/adulthood. Rats with a history of high-access exercise showed stronger fentanyl-associated lever discrimination during acquisition, greater motivation to obtain infusions of fentanyl following acquisition, and had an enhanced sensitivity to the reinstating effects of fentanyl-associated cues following extended (24 h/day), intermittent-access self-administration and protracted abstinence (14 days) compared to sedentary controls. In contrast, sedentary rats had greater overall responding (active- and inactive-lever) during acquisition and greater non-specific (inactive-lever) responding during extended-access self-administration. Molecular markers associated with opioid seeking/relapse were also differentially expressed in the nucleus accumbens core of rats with versus without a history of high-access exercise following relapse testing (e.g., Bdnf-IV and Drd2 expression). Together, these findings demonstrate that high-access exercise prior to and throughout early-adolescence enhances vulnerability to the reinforcing and cue-induced reinstating effects of opioids during later adolescence/adulthood. Thus, it is possible that the discontinuation of high intensity exercise contributes to the enhanced vulnerability observed in middle- and high-school athletes.
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Affiliation(s)
- Wendy J Lynch
- Department of Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA, 22904, USA.
| | - Anousheh Bakhti-Suroosh
- Department of Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA, 22904, USA
| | - Jean M Abel
- Department of Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA, 22904, USA
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He Y, Madeo G, Liang Y, Zhang C, Hempel B, Liu X, Mu L, Liu S, Bi GH, Galaj E, Zhang HY, Shen H, McDevitt RA, Gardner EL, Liu QS, Xi ZX. A red nucleus-VTA glutamate pathway underlies exercise reward and the therapeutic effect of exercise on cocaine use. SCIENCE ADVANCES 2022; 8:eabo1440. [PMID: 36054363 PMCID: PMC10848951 DOI: 10.1126/sciadv.abo1440] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2022] [Accepted: 07/19/2022] [Indexed: 06/15/2023]
Abstract
Physical exercise is rewarding and protective against drug abuse and addiction. However, the neural mechanisms underlying these actions remain unclear. Here, we report that long-term wheel-running produced a more robust increase in c-fos expression in the red nucleus (RN) than in other brain regions. Anatomic and functional assays demonstrated that most RN magnocellular portion (RNm) neurons are glutamatergic. Wheel-running activates a subset of RNm glutamate neurons that project to ventral tegmental area (VTA) dopamine neurons. Optogenetic stimulation of this pathway was rewarding, as assessed by intracranial self-stimulation and conditioned place preference, whereas optical inhibition blocked wheel-running behavior. Running wheel access decreased cocaine self-administration and cocaine seeking during extinction. Last, optogenetic stimulation of the RNm-to-VTA glutamate pathway inhibited responding to cocaine. Together, these findings indicate that physical exercise activates a specific RNm-to-VTA glutamatergic pathway, producing exercise reward and reducing cocaine intake.
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Affiliation(s)
- Yi He
- Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse, Intramural Research Program, Baltimore, MD 21224, USA
| | - Graziella Madeo
- Cellular Neurobiology Branch, National Institute on Drug Abuse, Intramural Research Program, Baltimore, MD 21224, USA
| | - Ying Liang
- Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse, Intramural Research Program, Baltimore, MD 21224, USA
| | - Cindy Zhang
- Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse, Intramural Research Program, Baltimore, MD 21224, USA
| | - Briana Hempel
- Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse, Intramural Research Program, Baltimore, MD 21224, USA
| | - Xiaojie Liu
- Department of Pharmacology and Toxicology, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Lianwei Mu
- Department of Pharmacology and Toxicology, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Shui Liu
- Department of Pharmacology and Toxicology, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Guo-Hua Bi
- Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse, Intramural Research Program, Baltimore, MD 21224, USA
| | - Ewa Galaj
- Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse, Intramural Research Program, Baltimore, MD 21224, USA
| | - Hai-Ying Zhang
- Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse, Intramural Research Program, Baltimore, MD 21224, USA
- Section on Molecular Neuroscience, National Institute of Mental Health, Bethesda, MD 20892, USA
| | - Hui Shen
- Cellular Neurobiology Branch, National Institute on Drug Abuse, Intramural Research Program, Baltimore, MD 21224, USA
| | - Ross A. McDevitt
- Cellular Neurobiology Branch, National Institute on Drug Abuse, Intramural Research Program, Baltimore, MD 21224, USA
- Comparative Medicine Section, National Institute on Aging, Intramural Research Program, Baltimore, MD 21224, USA
| | - Eliot L. Gardner
- Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse, Intramural Research Program, Baltimore, MD 21224, USA
| | - Qing-song Liu
- Department of Pharmacology and Toxicology, Medical College of Wisconsin, Milwaukee, WI 53226, USA
| | - Zheng-Xiong Xi
- Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse, Intramural Research Program, Baltimore, MD 21224, USA
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Li Y, Qu L, Li N, Wang X, Wang P, Ge SN, Wang XL. The optimized jugular vein catheterization reinforced cocaine self-administration addictive model for adult male Sprague-Dawley rats. Sci Rep 2022; 12:11711. [PMID: 35810209 PMCID: PMC9271077 DOI: 10.1038/s41598-022-15833-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Accepted: 06/30/2022] [Indexed: 11/19/2022] Open
Abstract
The self-administration (SA) model represents one of the most important and classic methods for drug addiction, and jugular vein catheterization is one of the most critical techniques in this animal model. We aimed to explore an optimized scheme to improve the success rate of rat jugular vein catheterization and SA model. Our experiment provided an optimized scheme which including numerous details, materials, approaches, updated techniques and protocols. Our experimental group consisted of 120 adult male Sprague–Dawley rats, which were divided into the Traditional Operation group (TO group) and the Optimized Operation group (OO group) by the random number table method and then further individually divided into the Saline Training group and the Cocaine Training group for the following SA training. Our results showed that the success rate of the jugular vein catheterization in the OO group was significantly greater than that in the TO group (93.33% vs 46.67%, χ2 = 31.11, P < 0.001). The optimized jugular vein catheterization could make the SA model more stable, reliable and efficient than the traditional operation. Compared with traditional methods, our optimized scheme made numerous improvements in materials and techniques including uniformity, individualized variability of the S-type positioning nail, the length and connection matching, the shape of the end and low cost. Our optimized scheme could provide a more stable and efficient tool for basic research on drug addiction. Several subtle improvements under our personal experience are usually important for augmenting operational efficiency.
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Affiliation(s)
- Yang Li
- Department of Neurosurgery, Tangdu Hospital, Air Force Medical University, Xi'an, Shaanxi, 710038, People's Republic of China.,Department of Neurosurgery, General Hospital of Central Theater Command, Wuhan, Hubei, 430070, China
| | - Liang Qu
- Department of Neurosurgery, Tangdu Hospital, Air Force Medical University, Xi'an, Shaanxi, 710038, People's Republic of China
| | - Nan Li
- Department of Neurosurgery, Tangdu Hospital, Air Force Medical University, Xi'an, Shaanxi, 710038, People's Republic of China
| | - Xin Wang
- Department of Neurosurgery, Tangdu Hospital, Air Force Medical University, Xi'an, Shaanxi, 710038, People's Republic of China
| | - Ping Wang
- Department of Neurosurgery, Tangdu Hospital, Air Force Medical University, Xi'an, Shaanxi, 710038, People's Republic of China
| | - Shun-Nan Ge
- Department of Neurosurgery, Tangdu Hospital, Air Force Medical University, Xi'an, Shaanxi, 710038, People's Republic of China.
| | - Xue-Lian Wang
- Department of Neurosurgery, Tangdu Hospital, Air Force Medical University, Xi'an, Shaanxi, 710038, People's Republic of China.
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Johnson AR, Christensen BA, Kelly SJ, Calipari ES. The influence of reinforcement schedule on experience-dependent changes in motivation. J Exp Anal Behav 2022; 117:320-330. [PMID: 35344601 PMCID: PMC9090977 DOI: 10.1002/jeab.755] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 02/28/2022] [Accepted: 03/02/2022] [Indexed: 12/19/2022]
Abstract
The progressive ratio procedure is used across fields to assess motivation for different reinforcers, define the effects of experimental interventions on motivation, and determine experience-dependent changes in motivation. However, less is known about how operant training schedules affect performance on this widely utilized task. Here we designed an experiment to examine the effect of variable ratio versus fixed ratio training schedules of reinforcement on progressive ratio performance while holding other performance variables constant between groups. We found a robust increase in maximum ratio completed between the pretest and posttraining test highlighting a robust training effect on progressive ratio performance. However, it did not matter if the training was under a fixed or variable ratio schedule. Additionally, we show that neither individual rates during training nor extinction responding correlated with maximum ratio achieved during the sessions. Finally, we show that rates during the training sessions do correlate with extinction performance, suggesting that these variables measure a different aspect of performance that does not predict motivation.
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Affiliation(s)
| | - Brooke A Christensen
- Department of Pharmacology, Vanderbilt University
- Vanderbilt Brain Institute, Vanderbilt University
| | | | - Erin S Calipari
- Department of Pharmacology, Vanderbilt University
- Vanderbilt Brain Institute, Vanderbilt University
- Vanderbilt Center for Addiction Research, Vanderbilt University
- Department of Molecular Physiology and Biophysics, Vanderbilt University
- Department of Psychiatry and Behavioral Sciences, Vanderbilt University
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7
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Abdullah M, Huang LC, Lin SH, Yang YK. Dopaminergic and glutamatergic biomarkers disruption in addiction and regulation by exercise: a mini review. Biomarkers 2022; 27:306-318. [PMID: 35236200 DOI: 10.1080/1354750x.2022.2049367] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
INTRODUCTION Drug addiction is associated with disruption of a multitude of biomarkers in various brain regions, particularly in the reward center. The most pronounced are dopaminergic and glutamatergic biomarkers, which are affected at various levels. Neuropathological changes in biomarkers alter the homeostasis of the glutamatergic and dopaminergic nervous systems and promote addiction-associated characteristics such as repeated intake, maintenance, withdrawal, reinstatement, and relapse. Exercise has been shown to have a buffering effect on such biomarkers and reverse the effects of addictive substances. METHODS A review of the literature searched in PubMed, examining drug addiction and physical exercise in relation to dopaminergic and glutamatergic systems at any of the three biomarker levels (i.e., neurotransmitter, receptor, or transporter). RESULTS We review the collective impact of addictive substances on the dopaminergic and glutamatergic systems and the beneficial effect of exercise in terms of reversing the damage to these systems. We propose future directions, including implications of exercise as an add-on therapy, substance use disorder (SUD) prognosis and diagnosis and designing of optimized exercise and pharmaceutical regimens based on the aforementioned biomarkers. CONCLUSION Exercise is beneficial for all types of drug addiction at all stages, by reversing molecular damages caused to dopaminergic and glutamatergic systems.
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Affiliation(s)
- Muhammad Abdullah
- Taiwan International Graduate Program in Interdisciplinary Neuroscience, National Cheng Kung University and Academia Sinica, Taipei, Taiwan
| | - Li-Chung Huang
- Institute of Clinical Medicine, National Cheng Kung University, Tainan, Taiwan.,Department of Psychiatry, Chia-Yi Branch, Taichung Veterans General Hospital, Chia-Yi, Taiwan
| | - Shih-Hsien Lin
- Department of Psychiatry, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan.,Institute of Behavioral Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Yen Kuang Yang
- Department of Psychiatry, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan.,Institute of Behavioral Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan.,Department of Psychiatry, Tainan Hospital, Ministry of Health and Welfare, Tainan, Taiwan
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8
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Camarini R. How good is exercise for people with alcohol use disorder? Alcohol Clin Exp Res 2022; 46:371-373. [PMID: 34978073 DOI: 10.1111/acer.14770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Revised: 12/23/2021] [Accepted: 12/28/2021] [Indexed: 11/27/2022]
Affiliation(s)
- Rosana Camarini
- Departamento de Farmacologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, Brazil
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9
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Sadat‐Shirazi M, Nouri Zadeh‐Tehrani S, Akbarabadi A, Mokri A, Taleb Zadeh Kasgari B, Zarrindast M. Exercise can restore behavioural and molecular changes of intergenerational morphine effects. Addict Biol 2022; 27:e13122. [PMID: 34931742 DOI: 10.1111/adb.13122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Revised: 11/11/2021] [Accepted: 11/12/2021] [Indexed: 11/28/2022]
Abstract
In our previous studies, the offspring of morphine-exposed parents (MEO) showed pharmacological tolerance to the morphine's reinforcing effect. According to the role of exercise in treatment of morphine addiction, the current study was designed to utilize exercise to improve the effect of parental morphine exposure on the morphine's reinforcing effect. Male and female rats received morphine for 10 days and were drug-free for another 10 days. Each morphine-exposed animal was allowed to mate either with a drug-naïve or a morphine-exposed rat. The offspring were divided into two groups: (1) offspring that were subjected to treadmill exercise and (2) offspring that were not subjected to exercise. The reinforcing effect of morphine was evaluated using conditioned place preference (CPP) and two-bottle choice (TBC) tests. Levels of dopamine receptors (D1DR and D2DR), μ-opioid receptor (MOR), and ΔFosB were evaluated in the nucleus accumbens. The MEO obtained lower preference scores in CPP and consumed morphine more than the control group in TBC. After 3 weeks of exercise, the reinforcing effect of morphine in the MEO was similar to the control. D1DR, D2DR, and MOR were increased in MEO compared with the controls before exercise. Levels of D1DR and MOR were decreased after exercise in the MEO; however, D1DR was increased in control. D2DR level did not change after exercise in MEO, but it increased in control group. Moreover, the level of ΔFosB was decreased among MEO while it was increased after exercise. In conclusion, exercise might modulate the reinforcing effect of morphine via alteration in levels of D1DR, MOR, and ΔFosB.
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Affiliation(s)
| | | | - Ardeshir Akbarabadi
- Iranian National Center for Addiction Studies Tehran University of Medical Sciences Tehran Iran
| | - Azarakhsh Mokri
- Iranian National Center for Addiction Studies Tehran University of Medical Sciences Tehran Iran
- Roozbeh Hospital Tehran University of Medical Sciences Tehran Iran
| | - Bahar Taleb Zadeh Kasgari
- Iranian National Center for Addiction Studies Tehran University of Medical Sciences Tehran Iran
- School of Biology, College of Science University of Tehran Tehran Iran
| | - Mohammad‐Reza Zarrindast
- Iranian National Center for Addiction Studies Tehran University of Medical Sciences Tehran Iran
- Department of Pharmacology, School of Medicine Tehran University of Medical Sciences Tehran Iran
- Cognitive and Neuroscience Research Center (CNRC), Tehran Medical Sciences Islamic Azad University Tehran Iran
- Endocrinology and Metabolism Research Institute Tehran University of Medical Science Tehran Iran
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Marrero-Cristobal G, Gelpi-Dominguez U, Morales-Silva R, Alvarado-Torres J, Perez-Torres J, Perez-Perez Y, Sepulveda-Orengo M. Aerobic exercise as a promising nonpharmacological therapy for the treatment of substance use disorders. J Neurosci Res 2021; 100:1602-1642. [PMID: 34850988 PMCID: PMC9156662 DOI: 10.1002/jnr.24990] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Revised: 10/06/2021] [Accepted: 10/14/2021] [Indexed: 12/12/2022]
Abstract
Despite the prevalence and public health impact of substance use disorders (SUDs), effective long-term treatments remain elusive. Aerobic exercise is a promising, nonpharmacological treatment currently under investigation as a strategy for preventing drug relapse. Aerobic exercise could be incorporated into the comprehensive treatment regimens for people with substance abuse disorders. Preclinical studies of SUD with animal models have shown that aerobic exercise diminishes drug-seeking behavior, which leads to relapse, in both male and female rats. Nevertheless, little is known regarding the effects of substance abuse-induced cellular and physiological adaptations believed to be responsible for drug-seeking behavior. Accordingly, the overall goal of this review is to provide a summary and an assessment of findings to date, highlighting evidence of the molecular and neurological effects of exercise on adaptations associated with SUD.
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Affiliation(s)
| | - Ursula Gelpi-Dominguez
- School of Behavioral and Brain Sciences, Ponce Health Sciences University, Ponce, PR, USA
| | - Roberto Morales-Silva
- Department of Basic Sciences, Ponce Research Institute, Ponce Health Sciences University, Ponce, PR, USA
| | - John Alvarado-Torres
- Department of Basic Sciences, Ponce Research Institute, Ponce Health Sciences University, Ponce, PR, USA
| | - Joshua Perez-Torres
- Department of Basic Sciences, Ponce Research Institute, Ponce Health Sciences University, Ponce, PR, USA
| | - Yobet Perez-Perez
- Department of Basic Sciences, Ponce Research Institute, Ponce Health Sciences University, Ponce, PR, USA
| | - Marian Sepulveda-Orengo
- Department of Basic Sciences, Ponce Research Institute, Ponce Health Sciences University, Ponce, PR, USA
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11
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He Q, Wu J, Wang X, Luo F, Yan K, Yu W, Mo Z, Jiang X. Exercise intervention can reduce the degree of drug dependence of patients with amphetamines/addiction by improving dopamine level and immunity and reducing negative emotions. Am J Transl Res 2021; 13:1779-1788. [PMID: 33841702 PMCID: PMC8014419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 08/26/2020] [Indexed: 06/12/2023]
Abstract
OBJECTIVE Exercise intervention can reduce drug dependence of patients with amphetamines addiction by improving dopamine level and immunity, and reducing negative emotions. METHODS Altogether 90 male patients with amphetamines addiction from March 2018 to June 2019 were selected and grouped. The routine rehabilitation group (RG) (30 cases) was given conventional rehabilitation treatment, while group 1 (30 cases) was given conventional rehabilitation treatment+aerobic exercise for 1 hour. Group 2 (30 cases) received routine rehabilitation+aerobic exercise+strength training for 1 hour. Before and after exercise intervention, the three groups were tested for psychological state with self-rating depression scale (SDS). Visual analogue scale (VAS) was used to evaluate the drug craving. Positive and negative syndrome scale (PANSS) and quality of life scale for drug addiction (QOL-DA) were used to detect the mental status and QOL. The immune function, high sensitivity C-reactive protein (hs-CRP) and dopamine (DA) levels were detected. RESULTS After intervention, the SDS, VAS and PANSS of group 1 and group 2 weresignificantly better than those of RG, while the improvement of scores of group 2 wassignificantly better than that of group 1 (P < 0.05). hs-CRP in group 1 and group 2 were significantly lower than those in RG, while hs-CRP in group 2 weresignificantly lower than those in group 1 (P < 0.05). IgA, IgG and DA in group 1 and group 2 weresignificantly higher than those in RG, and IgA, IgG and DA in group 2 weresignificantly higher than those in group 1 (P < 0.05). QOL-DA in group 1 and 2 weresignificantly higher than those of RG, and the improvement of scores of group 2 wassignificantly better than that of group 1 (P < 0.05). CONCLUSION Psychological status, drug craving, immune function, DA and QOL of patients with amphetamines addiction have been improved after exercise intervention.
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Affiliation(s)
- Qinghua He
- School of Physical Education and Health Science, Guangxi University for NationalitiesNanning 530006, Guangxi, China
| | - Jingqiong Wu
- Department of Physical Education, Guangxi Medical UniversityNanning 530021, Guangxi, China
| | - Xin Wang
- The Sixth Compulsory Isolation and Rehabilitation Center of GuangxiBeihai 536000, Guangxi Province, China
| | - Fuxuan Luo
- The Sixth Compulsory Isolation and Rehabilitation Center of GuangxiBeihai 536000, Guangxi Province, China
| | - Kaihui Yan
- The Sixth Compulsory Isolation and Rehabilitation Center of GuangxiBeihai 536000, Guangxi Province, China
| | - Wenjun Yu
- School of Physical Education and Health Science, Guangxi University for NationalitiesNanning 530006, Guangxi, China
| | - Zaimei Mo
- School of Physical Education and Health Science, Guangxi University for NationalitiesNanning 530006, Guangxi, China
| | - Xinping Jiang
- School of Physical Education and Health Science, Guangxi University for NationalitiesNanning 530006, Guangxi, China
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12
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Shifts in the neurobiological mechanisms motivating cocaine use with the development of an addiction-like phenotype in male rats. Psychopharmacology (Berl) 2021; 238:811-823. [PMID: 33241478 PMCID: PMC8290931 DOI: 10.1007/s00213-020-05732-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Accepted: 11/18/2020] [Indexed: 10/22/2022]
Abstract
RATIONALE The development of addiction is accompanied by a shift in the mechanisms motivating cocaine use from nucleus accumbens (NAc) dopamine D1 receptor (D1R) signaling to glutamate AMPA-kainate receptor (AMPA-R) signaling. OBJECTIVE Here, we determined whether similar shifts occur for NAc-D2R signaling and following systemic manipulation of D1R, D2R, and AMPA-R signaling. METHODS Male rats were given short-access (20 infusions/day) or extended-access to cocaine (24 h/day, 96 infusions/day, 10 days). Motivation for cocaine was assessed following 14 days of abstinence using a progressive-ratio schedule. Once responding stabilized, the effects of NAc-D2R antagonism (eticlopride; 0-10.0 μg/side) and systemic D1R (SCH-23390; 0-1.0 mg/kg), D2R (eticlopride; 0-0.1 mg/kg), and AMPA-R (CNQX; 0-1.5 mg/kg) antagonism, and NAc-dopamine-R gene expression (Drd1/2/3) were examined. RESULTS Motivation for cocaine was markedly higher in the extended- versus short-access group confirming the development of an addiction-like phenotype in the extended-access group. NAc-infused eticlopride decreased motivation for cocaine in both the short- and extended-access groups although low doses (0.1-0.3 μg) were more effective in the short-access group and high doses (3-10 μg/side) tended to be more effective in the extended-access group. Systemic administration of eticlopride (0.1 mg/kg) was more effective in the extended-access group, and systemic administration of CNQX was effective in the extended- but not short-access group. NAc-Drd2 expression was decreased in both the short- and extended-access groups. CONCLUSION These findings indicate that in contrast to NAc-D1R, D2R remain critical for motivating cocaine use with the development of an addiction-like phenotype. These findings also indicate that shifts in the mechanisms motivating cocaine use impact the response to both site-specific and systemic pharmacological treatment.
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13
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Townsend EA, Negus SS, Banks ML. Medications Development for Treatment of Opioid Use Disorder. Cold Spring Harb Perspect Med 2021; 11:a039263. [PMID: 31932466 PMCID: PMC7778216 DOI: 10.1101/cshperspect.a039263] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
This review describes methods for preclinical evaluation of candidate medications to treat opioid use disorder (OUD). The review is founded on the propositions that (1) drug self-administration procedures provide the most direct method for assessment of medication effectiveness, (2) procedures that assess choice between opioid and nondrug reinforcers are especially useful, and (3) states of opioid dependence and withdrawal profoundly influence both opioid reinforcement and effects of candidate medications. Effects of opioid medications and vaccines on opioid choice in nondependent and opioid-dependent subjects are reviewed. Various nonopioid medications have also been examined, but none yet have been identified that safely and reliably reduce opioid choice. Future research will focus on (1) strategies for increasing safety and/or effectiveness of opioid medications (e.g., G-protein-biased μ-opioid agonists), and (2) continued development of nonopioid medications (e.g., clonidine) that might serve as adjunctive agents to current opioid medications.
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Affiliation(s)
- E Andrew Townsend
- Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, Virginia 23298, USA
| | - S Stevens Negus
- Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, Virginia 23298, USA
| | - Matthew L Banks
- Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, Virginia 23298, USA
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14
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Abstract
This paper is the forty-first consecutive installment of the annual anthological review of research concerning the endogenous opioid system, summarizing articles published during 2018 that studied the behavioral effects of molecular, pharmacological and genetic manipulation of opioid peptides and receptors as well as effects of opioid/opiate agonists and antagonists. The review is subdivided into the following specific topics: molecular-biochemical effects and neurochemical localization studies of endogenous opioids and their receptors (2), the roles of these opioid peptides and receptors in pain and analgesia in animals (3) and humans (4), opioid-sensitive and opioid-insensitive effects of nonopioid analgesics (5), opioid peptide and receptor involvement in tolerance and dependence (6), stress and social status (7), learning and memory (8), eating and drinking (9), drug abuse and alcohol (10), sexual activity and hormones, pregnancy, development and endocrinology (11), mental illness and mood (12), seizures and neurologic disorders (13), electrical-related activity and neurophysiology (14), general activity and locomotion (15), gastrointestinal, renal and hepatic functions (16), cardiovascular responses (17), respiration and thermoregulation (18), and immunological responses (19).
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Affiliation(s)
- Richard J Bodnar
- Department of Psychology and Neuropsychology Doctoral Sub-Program, Queens College, City University of New York, Flushing, NY, 11367, United States.
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15
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Katsidoni V, Tzatzarakis MN, Karzi V, Thermos K, Kastellakis A, Panagis G. Differential effects of chronic voluntary wheel-running on morphine induced brain stimulation reward, motor activity and striatal dopaminergic activity. Behav Brain Res 2020; 394:112831. [PMID: 32721470 DOI: 10.1016/j.bbr.2020.112831] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 07/12/2020] [Accepted: 07/23/2020] [Indexed: 02/08/2023]
Abstract
Physical exercise could be a protective factor against the development of substance use disorders; however, a number of preclinical studies report reward-enhancing effects of exercise for various drugs of abuse. We examined the effects of chronic wheel-running on brain reward sensitivity, reaction to novelty, reward-facilitating and locomotor-stimulating effects of morphine, using the intracranial self-stimulation (ICSS) and the open field test (OFT). Male Sprague-Dawley rats were randomly assigned to a sedentary or exercised group. For the ICSS procedure, rats were implanted with electrodes and trained to respond for electrical stimulation. Several indices were recorded in the training phase to estimate brain reward sensitivity. Once responding was stable, the animals of both groups received systemic injections of morphine and their ICSS thresholds were measured with the curve-shift paradigm. Employing the OFT, basal and morphine-induced locomotor activity was measured. Finally, basal and morphine-evoked tissue levels of dopamine and its metabolites were determined in the striatum using gas chromatography/mass spectrometry. Chronic wheel-running decreased brain reward sensitivity and subsequently increased the reward-facilitating effect of morphine. Exercised animals demonstrated a decreased reaction to novelty and reduced morphine-induced locomotion. Lastly, dopaminergic activity was decreased in the striatum of exercised animals under basal conditions, whereas morphine administration led to an increase in dopamine turnover. These findings indicate that chronic voluntary exercise exerts divergent effects on reward function, psychomotor activity and the reward-facilitating and locomotor-activating effects of opioids during adulthood. Our results provide insights into the increased non-medical use of opioids among young athletes reported in the literature.
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Affiliation(s)
- Vicky Katsidoni
- Laboratory of Behavioral Neuroscience, Department of Psychology, School of Social Sciences, University of Crete, 74100, Rethymno, Crete, Greece
| | - Manolis N Tzatzarakis
- Laboratory of Toxicology, Medical School, University of Crete, 71003, Heraklion, Crete, Greece
| | - Vasiliki Karzi
- Laboratory of Toxicology, Medical School, University of Crete, 71003, Heraklion, Crete, Greece
| | - Kyriaki Thermos
- Laboratory of Pharmacology, Medical School, University of Crete, 71003, Heraklion, Crete, Greece
| | - Andreas Kastellakis
- Laboratory of Behavioral Neuroscience, Department of Psychology, School of Social Sciences, University of Crete, 74100, Rethymno, Crete, Greece
| | - George Panagis
- Laboratory of Behavioral Neuroscience, Department of Psychology, School of Social Sciences, University of Crete, 74100, Rethymno, Crete, Greece.
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16
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Effects of circuit-type resistance training on industrial opiate induced neurotransmitter disruption and performance changes of previously addicted men. BIOMEDICAL HUMAN KINETICS 2020. [DOI: 10.2478/bhk-2020-0022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Summary
Study aim: The aim of this study was to examine the effects of an 8-week circuit-type resistance training program on performance changes and neurotransmitter disruptions induced by industrial opiate in previously addicted men.
Materials and methods: Thirty industrial opiate addicted men volunteered to participate in this study and were randomly assigned to experimental (n = 15) and control groups (n = 15). The subjects in the experimental group performed circuit-type resistance training for 8 weeks, 3 days a week, with 40–75% of one-repetition maximum (1RM), while the control group did not perform any training. Before and after the training period muscular strength (1RM of bench press) and muscle endurance (sit-ups), flexibility (sit-and-reach), body fat percentage, waist-to-hip ratio (WHR) and cardio-respiratory endurance were measured. In addition, blood samples were drawn 24 h before and after 8 weeks of training to analyze serum levels of serotonin, dopamine, and endorphins.
Results: In this study, 8 weeks of circuit-type resistance training led to significantly higher serum levels of serotonin, dopamine, and endorphins, cardio-respiratory endurance, muscular strength and endurance in the experimental group compared to controls (P < 0.05), while flexibility, body fat percentage and WHR did not differ significantly (P > 0.05).
Conclusions: In conclusion, circuit resistance training can improve the serum levels of serotonin, dopamine, and endorphins, as well as indicators of health-related performance previously industrial opiate addicted men.
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17
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Rosa HZ, Barcelos RCS, Segat HJ, Roversi K, Dias VT, Milanesi LH, Burger ME. Physical exercise modifies behavioral and molecular parameters related to opioid addiction regardless of training time. Eur Neuropsychopharmacol 2020; 32:25-35. [PMID: 31899030 DOI: 10.1016/j.euroneuro.2019.12.111] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 11/26/2019] [Accepted: 12/13/2019] [Indexed: 12/23/2022]
Abstract
Addiction is a devastating worldwide disorder that requires effective and innovative therapies. Physical exercise could be useful in addiction treatment because it shares a common neural circuit with addictive drugs. Based on this, molecular adaptations consequent to time of exercise in opioid exposed animals were evaluated. Rats were designed as sedentary (SED) or exercised (EXE). This last group was separated to perform three different periods of swimming: short-term (S-EXE), medium-term (M-EXE) and long-term (L-EXE) for 14, 28 and 42 days, respectively. On the last exercising week, one-half of the animals from SED and all animals from S-, M- and l-EXE were concomitantly exposed to morphine-conditioned place preference (CPP) paradigm and y-maze task for behavioral assessments followed by molecular assays in both Nucleus accumbens (NAc) and hippocampus. Between SED groups, morphine conditioning showed drug-CPP and increased dopamine transporter (DAT), dopamine receptor type-1 (D1R), type-2 (D2R) and glucocorticoid receptor (GR) in both brain areas in relation to saline group. Besides the small morphine-CPP in relation to SED group, all periods decreased DAT, D1R, and GR immunoreactivity in NAc, DAT and D1R in hippocampus, while D2R in both brain areas and GR in hippocampus were primarily decreased by L-EXE. Our findings show that even a short-term exercise modifies behaviors related to drug withdrawal, changing DA targets and GR, which are closely linked to addiction. Therefore, our outcomes involving physical exercise are interesting to perform a possible clinical trial, thus expanding the knowledge about drug addiction.
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Affiliation(s)
- H Z Rosa
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
| | - R C S Barcelos
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
| | - H J Segat
- Programa de Pós-Graduação em Bioquímica Toxicológica, Universidade Federal de Santa Maria, RS, Brazil
| | - Kr Roversi
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
| | - V T Dias
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
| | - L H Milanesi
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
| | - M E Burger
- Programa de Pós-Graduação em Farmacologia, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil; Programa de Pós-Graduação em Bioquímica Toxicológica, Universidade Federal de Santa Maria, RS, Brazil; Departamento de Fisiologia e Farmacologia, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
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18
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Smethells JR, Greer A, Dougen B, Carroll ME. Effects of voluntary exercise and sex on multiply-triggered heroin reinstatement in male and female rats. Psychopharmacology (Berl) 2020; 237:453-463. [PMID: 31712970 PMCID: PMC7023997 DOI: 10.1007/s00213-019-05381-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Accepted: 10/16/2019] [Indexed: 12/24/2022]
Abstract
BACKGROUND The rise in heroin addiction has heightened the need for novel and effective treatments. Physical exercise has been shown as an effective treatment for stimulant abuse in clinical and pre-clinical research. However, this treatment has not yet been tested on opioid addiction. This study examined the effects of physical activity (wheel running) on heroin-seeking in rats within a reinstatement paradigm (i.e., heroin relapse model). METHODS Female and male rats were trained to self-administer intravenous heroin (0.015 mg/kg). Once trained, rats were placed into extinction (i.e., heroin abstinence) for 21 days with continuous access to a locked or unlocked running wheel. After extinction, rats were tested for drug- (heroin, caffeine, and yohimbine) and cue-primed reinstatement of heroin-seeking. RESULTS Females completed more wheel revolutions than males across all study phases. Access to an unlocked running wheel reduced extinction and reinstatement of heroin-seeking, with greater reductions in females than males across several reinstatement conditions. In the locked wheel group, female rats showed greater reinstatement of heroin-seeking than males across several priming conditions. CONCLUSIONS Wheel running reduced heroin-seeking in male and female rats, with females showing a more robust effect during reinstatement. The locked wheel group allowed an examination of sex differences in heroin reinstatement, which revealed that females showed greater vulnerability to heroin reinstatement than males, but with no other sex differences observed in maintenance or extinction. Overall, the results indicate that voluntary physical exercise may be an effective treatment for heroin dependence in humans.
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Affiliation(s)
- J. R. Smethells
- Research Fellow, Pharmaco-Neuro-Immunology Training Program,University of Minnesota, Minneapolis, MN, USA,Hennepin Healthcare Research Institute, Minneapolis, MN, USA
| | - A. Greer
- Department of Biological Science, University of Minnesota, Minneapolis, MN, USA
| | - B. Dougen
- Department of Psychiatry, University of Minnesota Medical School, Minneapolis, MN, USA
| | - M. E. Carroll
- Department of Psychiatry, University of Minnesota Medical School, Minneapolis, MN, USA
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19
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Terrón-Díaz ME, Wright SJ, Agosto MA, Lichtarge O, Wensel TG. Residues and residue pairs of evolutionary importance differentially direct signaling bias of D2 dopamine receptors. J Biol Chem 2019; 294:19279-19291. [PMID: 31676688 DOI: 10.1074/jbc.ra119.008068] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2019] [Revised: 10/16/2019] [Indexed: 01/11/2023] Open
Abstract
The D2 dopamine receptor and the serotonin 5-hydroxytryptamine 2A receptor (5-HT2A) are closely-related G-protein-coupled receptors (GPCRs) from the class A bioamine subfamily. Despite structural similarity, they respond to distinct ligands through distinct downstream pathways, whose dysregulation is linked to depression, bipolar disorder, addiction, and psychosis. They are important drug targets, and it is important to understand how their bias toward G-protein versus β-arrestin signaling pathways is regulated. Previously, evolution-based computational approaches, difference Evolutionary Trace and Evolutionary Trace-Mutual information (ET-Mip), revealed residues and residue pairs that, when switched in the D2 receptor to the corresponding residues from 5-HT2A, altered ligand potency and G-protein activation efficiency. We have tested these residue swaps for their ability to trigger recruitment of β-arrestin2 in response to dopamine or serotonin. The results reveal that the selected residues modulate agonist potency, maximal efficacy, and constitutive activity of β-arrestin2 recruitment. Whereas dopamine potency for most variants was similar to that for WT and lower than for G-protein activation, potency in β-arrestin2 recruitment for N124H3.42 was more than 5-fold higher. T205M5.54 displayed high constitutive activity, enhanced dopamine potency, and enhanced efficacy in β-arrestin2 recruitment relative to WT, and L379F6.41 was virtually inactive. These striking differences from WT activity were largely reversed by a compensating mutation (T205M5.54/L379F6.41) at residues previously identified by ET-Mip as functionally coupled. The observation that the signs and relative magnitudes of the effects of mutations in several cases are at odds with their effects on G-protein activation suggests that they also modulate signaling bias.
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Affiliation(s)
- María E Terrón-Díaz
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas 77030.,Graduate Program in Integrative Molecular and Biomedical Sciences, Baylor College of Medicine, Houston, Texas 77030
| | - Sara J Wright
- Verna and Marrs Mclean Department of Biochemistry and Molecular Biology Baylor College of Medicine, Houston, Texas 77030
| | - Melina A Agosto
- Verna and Marrs Mclean Department of Biochemistry and Molecular Biology Baylor College of Medicine, Houston, Texas 77030
| | - Olivier Lichtarge
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas 77030.,Verna and Marrs Mclean Department of Biochemistry and Molecular Biology Baylor College of Medicine, Houston, Texas 77030.,Department of Pharmacology and Chemical Biology, Baylor College of Medicine, Houston, Texas 77030
| | - Theodore G Wensel
- Department of Pharmacology and Chemical Biology, Baylor College of Medicine, Houston, Texas 77030
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20
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Abel JM, Nesil T, Bakhti-Suroosh A, Grant PA, Lynch WJ. Mechanisms underlying the efficacy of exercise as an intervention for cocaine relapse: a focus on mGlu5 in the dorsal medial prefrontal cortex. Psychopharmacology (Berl) 2019; 236:2155-2171. [PMID: 31161451 PMCID: PMC6626681 DOI: 10.1007/s00213-019-05208-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Accepted: 02/25/2019] [Indexed: 01/08/2023]
Abstract
RATIONALE Exercise shows promise as a treatment option for addiction; but in order to prevent relapse, it may need to be introduced early in the course of treatment. OBJECTIVE We propose that exercise, by upregulating dorsal medial prefrontal cortex (dmPFC)-nucleus accumbens (NAc) transmission, offsets deficits in pathways targeting glutamate, BDNF, and dopamine during early abstinence, and in doing so, normalizes neuroadaptations that underlie relapse. METHODS We compared the effects of exercise (wheel running, 2-h/day) during early (days 1-7), late (days 8-14), and throughout abstinence (days 1-14) to sedentary conditions on cocaine-seeking and gene expression in the dmPFC and NAc core of male rats tested following 24-h/day extended-access cocaine (up to 96 infusions/day) or saline self-administration and protracted abstinence (15 days). Based on these data, we then used site-specific manipulation to determine whether dmPFC metabotropic glutamate receptor5 (mGlu5) underlies the efficacy of exercise. RESULTS Exercise initiated during early, but not late abstinence, reduced cocaine-seeking; this effect was strongly associated with dmPFC Grm5 expression (gene encoding mGlu5), and modestly associated with dmPFC Grin1 and Bdnf-IV expression. Activation of mGlu5 in the dmPFC during early abstinence mimicked the efficacy of early-initiated exercise; however, inhibition of these receptors prior to the exercise sessions did not block its efficacy indicating that there may be redundancy in the mechanisms through which exercise reduces cocaine-seeking. CONCLUSION These findings indicate that addiction treatments, including exercise, should be tailored for early versus late phases of abstinence since their effectiveness will vary over abstinence due to the dynamic nature of the underlying neuroadaptations.
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Affiliation(s)
- Jean M. Abel
- Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA
| | - Tanseli Nesil
- Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA
| | | | - Patrick A. Grant
- Biochemistry and Molecular Genetics, University of Virginia, Charlottesville, VA
| | - Wendy J. Lynch
- Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA,Corresponding Author: Wendy J. Lynch, PhD, Department of Psychiatry and Neurobehavioral Sciences, University of Virginia, PO Box 801402, Charlottesville, VA 22904; Tel: (434) 243-0580; Fax: (434) 973-7031;
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