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Monroe SC, Radke AK. Opioid withdrawal: role in addiction and neural mechanisms. Psychopharmacology (Berl) 2023; 240:1417-1433. [PMID: 37162529 PMCID: PMC11166123 DOI: 10.1007/s00213-023-06370-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 04/19/2023] [Indexed: 05/11/2023]
Abstract
Withdrawal from opioids involves a negative affective state that promotes maintenance of drug-seeking behavior and relapse. As such, understanding the neurobiological mechanisms underlying withdrawal from opioid drugs is critical as scientists and clinicians seek to develop new treatments and therapies. In this review, we focus on the neural systems known to mediate the affective and somatic signs and symptoms of opioid withdrawal, including the mesolimbic dopaminergic system, basolateral amygdala, extended amygdala, and brain and hormonal stress systems. Evidence from preclinical studies suggests that these systems are altered following opioid exposure and that these changes mediate behavioral signs of negative affect such as aversion and anxiety during withdrawal. Adaptations in these systems also parallel the behavioral and psychological features of opioid use disorder (OUD), highlighting the important role of withdrawal in the development of addictive behavior. Implications for relapse and treatment are discussed as well as promising avenues for future research, with the hope of promoting continued progress toward characterizing neural contributors to opioid withdrawal and compulsive opioid use.
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Affiliation(s)
- Sean C Monroe
- Department of Psychology and Center for Neuroscience and Behavior, Miami University, 90 N Patterson Ave, Oxford, OH, USA
| | - Anna K Radke
- Department of Psychology and Center for Neuroscience and Behavior, Miami University, 90 N Patterson Ave, Oxford, OH, USA.
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2
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Differential Patterns of Synaptic Plasticity in the Nucleus Accumbens Caused by Continuous and Interrupted Morphine Exposure. J Neurosci 2023; 43:308-318. [PMID: 36396404 PMCID: PMC9838694 DOI: 10.1523/jneurosci.0595-22.2022] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 10/14/2022] [Accepted: 11/12/2022] [Indexed: 11/18/2022] Open
Abstract
Opioid exposure and withdrawal both cause adaptations in brain circuits that may contribute to abuse liability. These adaptations vary in magnitude and direction following different patterns of opioid exposure, but few studies have systematically manipulated the pattern of opioid administration while measuring neurobiological impact. In this study, we compared cellular and synaptic adaptations in the nucleus accumbens shell caused by morphine exposure that was either continuous or interrupted by daily bouts of naloxone-precipitated withdrawal. At the behavioral level, continuous morphine administration caused psychomotor tolerance, which was reversed when the continuity of morphine action was interrupted by naloxone-precipitated withdrawal. Using ex vivo slice electrophysiology in female and male mice, we investigated how these patterns of morphine administration altered intrinsic excitability and synaptic plasticity of medium spiny neurons (MSNs) expressing the D1 or D2 dopamine receptor. We found that morphine-evoked adaptations at excitatory synapses were predominately conserved between patterns of administration, but there were divergent effects on inhibitory synapses and the subsequent balance between excitatory and inhibitory synaptic input. Overall, our data suggest that continuous morphine administration produces adaptations that dampen the output of D1-MSNs, which are canonically thought to promote reward-related behaviors. Interruption of otherwise continuous morphine exposure does not dampen D1-MSN functional output to the same extent, which may enhance behavioral responses to subsequent opioid exposure. Our findings support the hypothesis that maintaining continuity of opioid administration could be an effective therapeutic strategy to minimize the vulnerability to opioid use disorders.SIGNIFICANCE STATEMENT Withdrawal plays a key role in the cycle of addiction to opioids like morphine. We studied how repeated cycles of naloxone-precipitated withdrawal from otherwise continuous opioid exposure can change brain function of the nucleus accumbens, which is an important brain region for reward and addiction. Different patterns of opioid exposure caused unique changes in communication between neurons in the nucleus accumbens, and the nature of these changes depended on the type of neuron being studied. The specific changes in communication between neurons caused by repeated cycles of withdrawal may increase vulnerability to opioid use disorders. This highlights the importance of reducing or preventing the experience of withdrawal during opioid treatment.
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3
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Cahill CM. Opioid dose regimen shapes mesolimbic adaptations. Neuropsychopharmacology 2020; 45:1777-1778. [PMID: 32350379 PMCID: PMC7608458 DOI: 10.1038/s41386-020-0679-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 04/03/2020] [Indexed: 12/04/2022]
Affiliation(s)
- Catherine M. Cahill
- grid.19006.3e0000 0000 9632 6718Department of Psychiatry and Biobehavioral Sciences, Shirley and Stefan Hatos Center for Neuropharmacology, Jane & Terry Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles, Los Angeles, CA USA 90095
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4
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Interruption of continuous opioid exposure exacerbates drug-evoked adaptations in the mesolimbic dopamine system. Neuropsychopharmacology 2020; 45:1781-1792. [PMID: 32079024 PMCID: PMC7608117 DOI: 10.1038/s41386-020-0643-x] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 02/10/2020] [Accepted: 02/13/2020] [Indexed: 12/14/2022]
Abstract
Drug-evoked adaptations in the mesolimbic dopamine system are postulated to drive opioid abuse and addiction. These adaptations vary in magnitude and direction following different patterns of opioid exposure, but few studies have systematically manipulated the pattern of opioid administration while measuring neurobiological and behavioral impact. We exposed male and female mice to morphine for one week, with administration patterns that were either intermittent (daily injections) or continuous (osmotic minipump infusion). We then interrupted continuous morphine exposure with either naloxone-precipitated or spontaneous withdrawal. Continuous morphine exposure caused tolerance to the psychomotor-activating effects of morphine, whereas both intermittent and interrupted morphine exposure caused long-lasting psychomotor sensitization. Given links between locomotor sensitization and mesolimbic dopamine signaling, we used fiber photometry and a genetically encoded dopamine sensor to conduct longitudinal measurements of dopamine dynamics in the nucleus accumbens. Locomotor sensitization caused by interrupted morphine exposure was accompanied by enhanced dopamine signaling in the nucleus accumbens. To further assess downstream consequences on striatal gene expression, we used next-generation RNA sequencing to perform genome-wide transcriptional profiling in the nucleus accumbens and dorsal striatum. The interruption of continuous morphine exposure exacerbated drug-evoked transcriptional changes in both nucleus accumbens and dorsal striatum, dramatically increasing differential gene expression and engaging unique signaling pathways. Our study indicates that opioid-evoked adaptations in brain function and behavior are critically dependent on the pattern of drug administration, and exacerbated by interruption of continuous exposure. Maintaining continuity of chronic opioid administration may, therefore, represent a strategy to minimize iatrogenic effects on brain reward circuits.
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5
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A Practical Approach to Assessment and Management of Patients at Risk for Non-medical Opioid Use: a Focus on the Patient with Cancer-Related Pain. CURRENT ANESTHESIOLOGY REPORTS 2020. [DOI: 10.1007/s40140-020-00417-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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6
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Sajko T, Rotim K, Kurtovic B, Rotim C, Rotim A. Prospective randomized appraisal of the best pain relief option after L4/L5 discectomy. Neurol Res 2020; 42:1003-1009. [PMID: 32713326 DOI: 10.1080/01616412.2020.1796383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
OBJECTIVES To determine the efficacy of paracetamol and tramadol analgesia via patient controlled pump and intermittent administration using the Short-Form McGill Pain Questionnaire after L4/L5 discectomy in neurosurgical patients. METHODS Fourteen months prospective quantitative study with 200 neurosurgical patients' participation who underwent elective discectomy of the L4/L5 intervertebral disc extrusion. The study was conducted due to a patient-controlled analgesia pump and intermittent analgesia application. Pain was assessed using the Short-Form McGill Pain Questionnaire in the Croatian language during the zero, first, and second postoperative day. RESULTS Perception of pain was reduced in patient controlled analgesia pump groups after the second measurement during the first postoperative day [95% CI: -3.89, -0.76], regardless of administered analgesic (p< 0.001). After the final measurement, at 7 PM on the second postoperative day, the differences were not significant (p= 0.070). This study results are registered and allocated in the Australian New Zealand Clinical Trials Registry (ANZCTR). DISCUSSION Analgesia administration via patient-controlled pump contributes to the alleviation of postoperative pain after L4/L5 disc extrusion surgery regardless of administered analgesic.
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Affiliation(s)
- Tomislav Sajko
- University of Applied Health Sciences , Zagreb, Croatia.,School of Medicine, Josip Juraj Strossmayer University of Osijek , Osijek, Croatia.,Faculty of Education and Rehabilitation Sciences, University of Zagreb , Zagreb, Croatia.,Clinical Department of Neurosurgery, Sestre Milosrdnice University Hospital Center , Zagreb, Croatia
| | - Kresimir Rotim
- University of Applied Health Sciences , Zagreb, Croatia.,School of Medicine, Josip Juraj Strossmayer University of Osijek , Osijek, Croatia.,Clinical Department of Neurosurgery, Sestre Milosrdnice University Hospital Center , Zagreb, Croatia
| | | | - Cecilija Rotim
- University of Applied Health Sciences , Zagreb, Croatia.,"Andrija Stampar" Teaching Institute of Public Health , Zagreb, Croatia
| | - Ante Rotim
- Department of Neurosurgery, Dubrava University Hospital , Zagreb, Croatia
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7
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Liu S, See KC, Ngiam KY, Celi LA, Sun X, Feng M. Reinforcement Learning for Clinical Decision Support in Critical Care: Comprehensive Review. J Med Internet Res 2020; 22:e18477. [PMID: 32706670 PMCID: PMC7400046 DOI: 10.2196/18477] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 05/05/2020] [Accepted: 05/13/2020] [Indexed: 12/21/2022] Open
Abstract
Background Decision support systems based on reinforcement learning (RL) have been implemented to facilitate the delivery of personalized care. This paper aimed to provide a comprehensive review of RL applications in the critical care setting. Objective This review aimed to survey the literature on RL applications for clinical decision support in critical care and to provide insight into the challenges of applying various RL models. Methods We performed an extensive search of the following databases: PubMed, Google Scholar, Institute of Electrical and Electronics Engineers (IEEE), ScienceDirect, Web of Science, Medical Literature Analysis and Retrieval System Online (MEDLINE), and Excerpta Medica Database (EMBASE). Studies published over the past 10 years (2010-2019) that have applied RL for critical care were included. Results We included 21 papers and found that RL has been used to optimize the choice of medications, drug dosing, and timing of interventions and to target personalized laboratory values. We further compared and contrasted the design of the RL models and the evaluation metrics for each application. Conclusions RL has great potential for enhancing decision making in critical care. Challenges regarding RL system design, evaluation metrics, and model choice exist. More importantly, further work is required to validate RL in authentic clinical environments.
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Affiliation(s)
- Siqi Liu
- NUS Graduate School for Integrative Science and Engineering, National University of Singapore, Singapore, Singapore.,Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore
| | - Kay Choong See
- Division of Respiratory & Critical Care Medicine, National University Hospital, Singapore, Singapore
| | - Kee Yuan Ngiam
- Group Chief Technology Office, National University Health System, Singapore, Singapore
| | - Leo Anthony Celi
- Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA, United States.,Division of Pulmonary, Critical Care and Sleep Medicine, Beth Israel Deaconess Medical Center, Boston, MA, United States
| | | | - Mengling Feng
- Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore
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Lopez-Martinez D, Eschenfeldt P, Ostvar S, Ingram M, Hur C, Picard R. Deep Reinforcement Learning for Optimal Critical Care Pain Management with Morphine using Dueling Double-Deep Q Networks. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2020; 2019:3960-3963. [PMID: 31946739 DOI: 10.1109/embc.2019.8857295] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Opioids are the preferred medications for the treatment of pain in the intensive care unit. While under-treatment leads to unrelieved pain and poor clinical outcomes, excessive use of opioids puts patients at risk of experiencing multiple adverse effects. In this work, we present a sequential decision making framework for opioid dosing based on deep reinforcement learning. It provides real-time clinically interpretable dosing recommendations, personalized according to each patient's evolving pain and physiological condition. We focus on morphine, one of the most commonly prescribed opioids. To train and evaluate the model, we used retrospective data from the publicly available MIMIC-3 database. Our results demonstrate that reinforcement learning may be used to aid decision making in the intensive care setting by providing personalized pain management interventions.
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9
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Bendová Z, Pačesová D, Novotný J. The day-night differences in ERK1/2, GSK3β activity and c-Fos levels in the brain, and the responsiveness of various brain structures to morphine. J Comp Neurol 2020; 528:2471-2495. [PMID: 32170720 DOI: 10.1002/cne.24906] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 02/17/2020] [Accepted: 03/09/2020] [Indexed: 11/12/2022]
Abstract
As with other drugs or pharmaceuticals, opioids differ in their rewarding or analgesic effects depending on when they are applied. In the previous study, we have demonstrated the day/night difference in the sensitivity of the major circadian clock in the suprachiasmatic nucleus to a low dose of morphine, and showed the bidirectional effect of morphine on pERK1/2 and pGSK3β levels in the suprachiasmatic nucleus depending on the time of administration. The main aim of this study was to identify other brain structures that respond differently to morphine depending on the time of its administration. Using immunohistochemistry, we identified 44 structures that show time-of-day specific changes in c-Fos level and activity of ERK1/2 and GSK3β kinases in response to a single dose of 1 mg/kg morphine. Furthermore, comparison among control groups revealed the differences in the spontaneous levels of all markers with a generally higher level during the night, that is, in the active phase of the day. We thus provide further evidence for diurnal variations in the activity of brain regions outside the suprachiasmatic nucleus indicated by the temporal changes in the molecular substrate. We suggest that these changes are responsible for generating diurnal variation in the reward behavior or analgesic effect of opioid administration.
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Affiliation(s)
- Zdeňka Bendová
- Faculty of Science, Charles University, Prague, Czech Republic.,Department of Sleep Medicine and Chronobiology, National Institute of Mental Health, Klecany, Czech Republic
| | - Dominika Pačesová
- Faculty of Science, Charles University, Prague, Czech Republic.,Department of Sleep Medicine and Chronobiology, National Institute of Mental Health, Klecany, Czech Republic
| | - Jiří Novotný
- Faculty of Science, Charles University, Prague, Czech Republic
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10
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Arthur J, Reddy A, Smith U, Hui D, Park M, Liu D, Vaughan-Adams N, Haider A, Williams J, Bruera E. Practices and perceptions regarding intravenous opioid infusion and cancer pain management. Cancer 2019; 125:3882-3889. [PMID: 31291011 PMCID: PMC11186036 DOI: 10.1002/cncr.32380] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 03/01/2019] [Accepted: 06/06/2019] [Indexed: 11/08/2022]
Abstract
BACKGROUND In view of the recent opioid crisis, ways to promote safe and effective opioid-related practices are needed. Faster intravenous (iv) opioid infusion rates can result in increased adverse effects and risk for nonmedical opioid use. Data on best practices regarding safe iv opioid administration for cancer pain are limited. This study examined iv opioid bolus infusion practices and perceptions about opioids in cancer pain among 4 groups of inpatient oncology nurses. METHODS An anonymous cross-sectional survey was conducted among oncology nurses working in medical, surgical, intensive care unit (ICU), and emergency department (ED) settings. An iv opioid bolus infusion speed less than 120 seconds was considered too fast. RESULTS The participant response rate was 59% (731 of 1234). Approximately 58%, 54%, and 58% of all nurses administered morphine, hydromorphone, and fentanyl, respectively, in less than 120 seconds. The median morphine infusion speeds were 55, 60, 60, and 85 seconds for ICU, surgical, ED, and medical unit nurses, respectively (P = .0002). The odds ratios for infusing too fast were 2.04 and 2.52 for ED (P = .039) and ICU nurses (P = .003), respectively, in comparison with medical unit nurses, and they were 0.27 and 0.18 with frequent (P = .003) and very frequent use of a timing device (P = .0001), respectively, in comparison with no use. CONCLUSIONS More than half the nurses working in the inpatient setting reported administering iv opioids too fast. ICU nurses administered opioids the fastest. Nurses who frequently used a timing device were less likely to infuse too fast. Further research is needed to standardize and improve the safe intermittent administration of iv opioids to patients with cancer.
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Affiliation(s)
- Joseph Arthur
- Dept of Palliative, Rehabilitation and Integrative Medicine, The University of Texas MD Anderson Cancer, Houston, Texas
| | - Akhila Reddy
- Dept of Palliative, Rehabilitation and Integrative Medicine, The University of Texas MD Anderson Cancer, Houston, Texas
| | - Uniqua Smith
- Dept. of Nursing, The University of Texas MD Anderson Cancer, Houston, Texas
| | - David Hui
- Dept of Palliative, Rehabilitation and Integrative Medicine, The University of Texas MD Anderson Cancer, Houston, Texas
| | - Minjeong Park
- Dept. of Biostatistics, The University of Texas MD Anderson Cancer, Houston, Texas
| | - Diane Liu
- Dept. of Biostatistics, The University of Texas MD Anderson Cancer, Houston, Texas
| | | | - Ali Haider
- Dept of Palliative, Rehabilitation and Integrative Medicine, The University of Texas MD Anderson Cancer, Houston, Texas
| | - Janet Williams
- Dept of Palliative, Rehabilitation and Integrative Medicine, The University of Texas MD Anderson Cancer, Houston, Texas
| | - Eduardo Bruera
- Dept of Palliative, Rehabilitation and Integrative Medicine, The University of Texas MD Anderson Cancer, Houston, Texas
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11
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Zhang J, Wang Y, Qi X. Systemic Rapamycin Attenuates Morphine-Induced Analgesic Tolerance and Hyperalgesia in Mice. Neurochem Res 2018; 44:465-471. [DOI: 10.1007/s11064-018-2699-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Revised: 12/04/2018] [Accepted: 12/10/2018] [Indexed: 10/27/2022]
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12
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Gao JT, Jordan CJ, Bi GH, He Y, Yang HJ, Gardner EL, Xi ZX. Deletion of the type 2 metabotropic glutamate receptor increases heroin abuse vulnerability in transgenic rats. Neuropsychopharmacology 2018; 43:2615-2626. [PMID: 30283001 PMCID: PMC6224385 DOI: 10.1038/s41386-018-0231-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 09/20/2018] [Accepted: 09/21/2018] [Indexed: 12/21/2022]
Abstract
Opioid abuse is a rapidly growing public health crisis in the USA. Despite extensive research in the past decades, little is known about the etiology of opioid addiction or the neurobiological risk factors that increase vulnerability to opioid use and abuse. Recent studies suggest that the type 2 metabotropic glutamate receptor (mGluR2) is critically involved in substance abuse and addiction. In the present study, we evaluated whether low-mGluR2 expression may represent a risk factor for the development of opioid abuse and addiction using transgenic mGluR2-knockout (mGluR2-KO) rats. Compared to wild-type controls, mGluR2-KO rats exhibited higher nucleus accumbens (NAc) dopamine (DA) and locomotor responses to heroin, higher heroin self-administration and heroin intake, more potent morphine-induced analgesia and more severe naloxone-precipitated withdrawal symptoms. In contrast, mGluR2-KO rats displayed lower motivation for heroin self-administration under high price progressive-ratio (PR) reinforcement conditions. Taken together, these findings suggest that mGluR2 may play an inhibitory role in opioid action, such that deletion of this receptor results in an increase in brain DA responses to heroin and in acute opioid reward and analgesia. Low-mGluR2 expression in the brain may therefore be a risk factor for the initial development of opioid abuse and addiction.
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Affiliation(s)
- Jun-Tao Gao
- Addiction Biology Unit, Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse, Intramural Research Program, Baltimore, MD, 21224, USA
- Department of Physiology, Jilin Medical University, Jilin, 132013, P.R. China
| | - Chloe J Jordan
- Addiction Biology Unit, Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse, Intramural Research Program, Baltimore, MD, 21224, USA
| | - Guo-Hua Bi
- Addiction Biology Unit, Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse, Intramural Research Program, Baltimore, MD, 21224, USA
| | - Yi He
- Addiction Biology Unit, Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse, Intramural Research Program, Baltimore, MD, 21224, USA
| | - Hong-Ju Yang
- Addiction Biology Unit, Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse, Intramural Research Program, Baltimore, MD, 21224, USA
| | - Eliot L Gardner
- Addiction Biology Unit, Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse, Intramural Research Program, Baltimore, MD, 21224, USA
| | - Zheng-Xiong Xi
- Addiction Biology Unit, Molecular Targets and Medications Discovery Branch, National Institute on Drug Abuse, Intramural Research Program, Baltimore, MD, 21224, USA.
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13
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Pharmacological modulation of neuropathic pain-related depression of behavior: effects of morphine, ketoprofen, bupropion and [INCREMENT]9-tetrahydrocannabinol on formalin-induced depression of intracranial self-stimulation in rats. Behav Pharmacol 2017; 27:364-76. [PMID: 26588213 DOI: 10.1097/fbp.0000000000000207] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Neuropathic pain is often associated with behavioral depression. Intraplantar formalin produces sustained, neuropathy-associated depression of intracranial self-stimulation (ICSS) in rats. This study evaluated pharmacological modulation of formalin-induced ICSS depression. Rats with intracranial electrodes targeting the medial forebrain bundle responded for electrical brain stimulation in an ICSS procedure. Bilateral intraplantar formalin administration depressed ICSS for 14 days. Morphine (0.32-3.2 mg/kg), ketoprofen (0.1-10 mg/kg), bupropion (3.2-32 mg/kg), and [INCREMENT]9-tetrahydrocannabinol (THC; 0.32-3.2 mg/kg) were evaluated for their effectiveness to reverse formalin-induced depression of ICSS. Drug effects on formalin-induced mechanical allodynia were evaluated for comparison. Morphine and bupropion reversed both formalin-induced ICSS depression and mechanical allodynia, and effects on ICSS were sustained during repeated treatment. Ketoprofen failed to reverse either formalin effect. THC blocked mechanical allodynia, but decreased ICSS in control rats and exacerbated formalin-induced depression of ICSS. The failure of ketoprofen to alter formalin effects suggests that formalin effects result from neuropathy rather than inflammation. The effectiveness of morphine and bupropion to reverse formalin effects agrees with other evidence that these drugs block pain-depressed behavior in rats and relieve neuropathic pain in humans. The effects of THC suggest general behavioral suppression and do not support the use of THC to treat neuropathic pain.
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Abstract
This paper is the thirty-eighth consecutive installment of the annual review of research concerning the endogenous opioid system. It summarizes papers published during 2015 that studied the behavioral effects of molecular, pharmacological and genetic manipulation of opioid peptides, opioid receptors, opioid agonists and opioid antagonists. The particular topics that continue to be covered include the molecular-biochemical effects and neurochemical localization studies of endogenous opioids and their receptors related to behavior, and the roles of these opioid peptides and receptors in pain and analgesia, stress and social status, tolerance and dependence, learning and memory, eating and drinking, drug abuse and alcohol, sexual activity and hormones, pregnancy, development and endocrinology, mental illness and mood, seizures and neurologic disorders, electrical-related activity and neurophysiology, general activity and locomotion, gastrointestinal, renal and hepatic functions, cardiovascular responses, respiration and thermoregulation, and immunological responses.
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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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Individual differences in initial morphine sensitivity as a predictor for the development of opiate addiction in rats. Behav Brain Res 2016; 313:315-323. [DOI: 10.1016/j.bbr.2016.07.038] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2016] [Revised: 07/09/2016] [Accepted: 07/21/2016] [Indexed: 12/14/2022]
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16
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Oladosu FA, Ciszek BP, O'Buckley SC, Nackley AG. Novel intrathecal and subcutaneous catheter delivery systems in the mouse. J Neurosci Methods 2016; 264:119-128. [PMID: 26976722 DOI: 10.1016/j.jneumeth.2016.03.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Revised: 03/03/2016] [Accepted: 03/07/2016] [Indexed: 11/30/2022]
Abstract
BACKGROUND Catheter systems that permit targeted delivery of genes, molecules, ligands, and other agents represent an investigative tool critical to the development of clinically relevant animal models that facilitate the study of neurological health and disease. The development of new sustained catheter delivery systems to spinal and peripheral sites will reduce the need for repeated injections, while ensuring constant levels of drug in plasma and tissues. NEW METHOD Here, we introduce two novel catheter delivery systems in the mouse: the O'Buckley intrathecal catheter system for sustained delivery to the spinal region and a subcutaneous bifurcated catheter system for sustained drug delivery to both hindpaws. RESULTS The O'Buckley intrathecal catheter system consistently distributed Evans Blue throughout the spinal cord, with the greatest concentration at the thoracic region, and with an 85% surgery success rate. The subcutaneous catheter system consistently distributed Evans Blue to the hindlimbs, with a 100% surgery success rate. COMPARISON TO EXISTING METHOD The O'Buckley intrathecal catheter system accomplishes sustained drug delivery to the spinal region, with a 2-fold increase in surgery success rate, as compared to the traditional method. Our subcutaneous bifurcated catheter system accomplishes sustained drug delivery to both hindpaws, eliminating the need for repeated intraplantar injections. CONCLUSIONS We have developed catheter systems that improve upon traditional methods in order to achieve sustained localized drug delivery to spinal tissues and to hindpaw tissues surrounding peripheral sciatic nerve terminals. These methods have a broad reach, and can be used to enhance behavioral, physiologic and mechanistic studies in mice.
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Affiliation(s)
- Folabomi A Oladosu
- Curriculum of Neurobiology, University of North Carolina, Chapel Hill, 27599 NC, USA.
| | - Brittney P Ciszek
- Curriculum of Oral Biology, University of North Carolina, Chapel Hill, 27599 NC, USA.
| | - Sandra C O'Buckley
- Center for Translational Pain Medicine, Department of Anesthesiology, Duke University School of Medicine, 905 South LaSalle Street, Durham, 27710 NC, USA.
| | - Andrea G Nackley
- Center for Translational Pain Medicine, Department of Anesthesiology, Duke University School of Medicine, 905 South LaSalle Street, Durham, 27710 NC, USA.
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