1
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Alami K, Ghasemi E, Semnanian S, Azizi H. Adolescent morphine exposure changes the endogenous vlPAG opioid response to inflammatory pain in rats. Dev Psychobiol 2024; 66:e22447. [PMID: 38131239 DOI: 10.1002/dev.22447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 11/09/2023] [Accepted: 11/17/2023] [Indexed: 12/23/2023]
Abstract
Adolescence is one of the most critical periods for brain development, and exposure to morphine during this period can have long-life effects on pain-related behaviors. The opioid system in the periaqueductal gray (PAG) is highly vulnerable to drug exposure. However, the impact of adolescent morphine exposure (AME) on the endogenous opioid system in the PAG is currently unknown. This study aims to investigate the long-lasting effects of AME on the endogenous opioid system and its involvement in altering nociceptive behaviors. Adolescent rats were given escalating doses of morphine (2.5-25 mg/kg, subcutaneous) or an equal volume of saline twice daily for 10 consecutive days (PND 31-40). After a 30-day washout period, adult rats underwent formalin tests following microinjection of morphine, naloxone, or saline into the ventrolateral PAG (vlPAG) region. The results indicated that morphine microinjection into the vlPAG of the adolescent morphine-treated group significantly reduced the nociceptive score. However, the analgesic response to morphine in this group was significantly lower compared to the saline-treated group during adolescence. Additionally, the nociceptive score significantly increased following naloxone but not saline microinjection into the vlPAG of the saline-treated group during adolescence, rather than the morphine-treated one. These findings indicate that AME has long-lasting effects on the endogenous opioid system in the vlPAG, which can consequently alter behaviors related to inflammatory pain in adulthood.
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Affiliation(s)
- Kawsar Alami
- Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Elmira Ghasemi
- Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Saeed Semnanian
- Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Hossein Azizi
- Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
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2
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Flores A, Nguyen NM, Pendyala G. Developmental outcomes with perinatal exposure (DOPE) to prescription opioids. NEUROIMMUNE PHARMACOLOGY AND THERAPEUTICS 2023; 2:339-351. [PMID: 38058996 PMCID: PMC10696573 DOI: 10.1515/nipt-2023-0017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Accepted: 11/07/2023] [Indexed: 12/08/2023]
Abstract
Researchers have found considerable evidence in the past 20 years that perinatal opioid exposure leads to an increased risk of developmental disorders in offspring that persist into adulthood. The use of opioids to treat pain concerning pregnancy, delivery, and postpartum complications has been rising. As a result, communities have reported a 300-400 % increase in Neonatal Opioid Withdrawal Syndrome (NOWS). NOWS represents the initial stage of several behavioral, phenotypic, and synaptic deficits. This review article summarizes the Developmental Outcomes of Perinatal Exposure (DOPE) to prescription opioids. Moreover, we also seek to connect these findings to clinical research that describes DOPE at multiple stages of life. Since specific mechanisms that underlie DOPE remain unclear, this article aims to provide a framework for conceptualizing across all ages and highlight the implications they may have for longevity.
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Affiliation(s)
- Adrian Flores
- Department of Anesthesiology, University of Nebraska Medical Center (UNMC), Omaha, NE, USA
- Department of Cellular and Integrative Physiology, UNMC, Omaha, NE, USA
| | - Nghi M. Nguyen
- Department of Anesthesiology, University of Nebraska Medical Center (UNMC), Omaha, NE, USA
- Department of Genetics, Cell Biology and Anatomy, UNMC, Omaha, NE, USA
| | - Gurudutt Pendyala
- Department of Anesthesiology, University of Nebraska Medical Center (UNMC), Omaha, NE, USA
- Department of Genetics, Cell Biology and Anatomy, UNMC, Omaha, NE, USA
- Child Health Research Institute, Omaha, NE, USA
- National Strategic Research Institute, UNMC, Omaha, NE, USA
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3
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Matthiesen M, Khlaifia A, Steininger CFD, Dadabhoy M, Mumtaz U, Arruda-Carvalho M. Maturation of nucleus accumbens synaptic transmission signals a critical period for the rescue of social deficits in a mouse model of autism spectrum disorder. Mol Brain 2023; 16:46. [PMID: 37226266 DOI: 10.1186/s13041-023-01028-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Accepted: 04/20/2023] [Indexed: 05/26/2023] Open
Abstract
Social behavior emerges early in development, a time marked by the onset of neurodevelopmental disorders featuring social deficits, including autism spectrum disorder (ASD). Although social deficits are at the core of the clinical diagnosis of ASD, very little is known about their neural correlates at the time of clinical onset. The nucleus accumbens (NAc), a brain region extensively implicated in social behavior, undergoes synaptic, cellular and molecular alterations in early life, and is particularly affected in ASD mouse models. To explore a link between the maturation of the NAc and neurodevelopmental deficits in social behavior, we compared spontaneous synaptic transmission in NAc shell medium spiny neurons (MSNs) between the highly social C57BL/6J and the idiopathic ASD mouse model BTBR T+Itpr3tf/J at postnatal day (P) 4, P6, P8, P12, P15, P21 and P30. BTBR NAc MSNs display increased spontaneous excitatory transmission during the first postnatal week, and increased inhibition across the first, second and fourth postnatal weeks, suggesting accelerated maturation of excitatory and inhibitory synaptic inputs compared to C57BL/6J mice. BTBR mice also show increased optically evoked medial prefrontal cortex-NAc paired pulse ratios at P15 and P30. These early changes in synaptic transmission are consistent with a potential critical period, which could maximize the efficacy of rescue interventions. To test this, we treated BTBR mice in either early life (P4-P8) or adulthood (P60-P64) with the mTORC1 antagonist rapamycin, a well-established intervention for ASD-like behavior. Rapamycin treatment rescued social interaction deficits in BTBR mice when injected in infancy, but did not affect social interaction in adulthood.
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Affiliation(s)
- Melina Matthiesen
- Department of Psychology, University of Toronto Scarborough, Toronto, ON, M1C1A4, Canada
| | - Abdessattar Khlaifia
- Department of Psychology, University of Toronto Scarborough, Toronto, ON, M1C1A4, Canada
| | | | - Maryam Dadabhoy
- Department of Psychology, University of Toronto Scarborough, Toronto, ON, M1C1A4, Canada
| | - Unza Mumtaz
- Department of Psychology, University of Toronto Scarborough, Toronto, ON, M1C1A4, Canada
| | - Maithe Arruda-Carvalho
- Department of Psychology, University of Toronto Scarborough, Toronto, ON, M1C1A4, Canada.
- Department of Cell and Systems Biology, University of Toronto, Toronto, ON, M5S3G5, Canada.
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4
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Rabiller L, Labit E, Guissard C, Gilardi S, Guiard BP, Moulédous L, Silva M, Mithieux G, Pénicaud L, Lorsignol A, Casteilla L, Dromard C. Pain sensing neurons promote tissue regeneration in adult mice. NPJ Regen Med 2021; 6:63. [PMID: 34650070 PMCID: PMC8516997 DOI: 10.1038/s41536-021-00175-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Accepted: 09/14/2021] [Indexed: 01/01/2023] Open
Abstract
Tissue repair after injury in adult mammals, usually results in scarring and loss of function in contrast to lower vertebrates such as the newt and zebrafish that regenerate. Understanding the regulatory processes that guide the outcome of tissue repair is therefore a concerning challenge for regenerative medicine. In multiple regenerative animal species, the nerve dependence of regeneration is well established, but the nature of the innervation required for tissue regeneration remains largely undefined. Using our model of induced adipose tissue regeneration in adult mice, we demonstrate here that nociceptive nerves promote regeneration and their removal impairs tissue regeneration. We also show that blocking the receptor for the nociceptive neuropeptide calcitonin gene-related peptide (CGRP) inhibits regeneration, whereas CGRP administration induces regeneration. These findings reveal that peptidergic nociceptive neurons are required for adult mice tissue regeneration.
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Affiliation(s)
- Lise Rabiller
- RESTORE, UMR INSERM 1301/CNRS 5070/Université Paul Sabatier/EFS/ENVT, Toulouse, France.,Department of Physiology and Cell Information Systems, McGill University, Montreal, QC, Canada.,Alan Edwards Center for Research on Pain, McGill University, Montreal, QC, Canada
| | - Elodie Labit
- RESTORE, UMR INSERM 1301/CNRS 5070/Université Paul Sabatier/EFS/ENVT, Toulouse, France.,Department of Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada
| | - Christophe Guissard
- RESTORE, UMR INSERM 1301/CNRS 5070/Université Paul Sabatier/EFS/ENVT, Toulouse, France
| | - Silveric Gilardi
- RESTORE, UMR INSERM 1301/CNRS 5070/Université Paul Sabatier/EFS/ENVT, Toulouse, France
| | - Bruno P Guiard
- Centre de Recherches sur la Cognition Animale (CRCA), Centre de Biologie Intégrative (CBI), Université de Toulouse, CNRS UMR-5169, UPS, Toulouse, France
| | - Lionel Moulédous
- Centre de Recherches sur la Cognition Animale (CRCA), Centre de Biologie Intégrative (CBI), Université de Toulouse, CNRS UMR-5169, UPS, Toulouse, France
| | | | | | - Luc Pénicaud
- RESTORE, UMR INSERM 1301/CNRS 5070/Université Paul Sabatier/EFS/ENVT, Toulouse, France
| | - Anne Lorsignol
- RESTORE, UMR INSERM 1301/CNRS 5070/Université Paul Sabatier/EFS/ENVT, Toulouse, France
| | - Louis Casteilla
- RESTORE, UMR INSERM 1301/CNRS 5070/Université Paul Sabatier/EFS/ENVT, Toulouse, France
| | - Cécile Dromard
- RESTORE, UMR INSERM 1301/CNRS 5070/Université Paul Sabatier/EFS/ENVT, Toulouse, France.
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5
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Berthézène CD, Rabiller L, Jourdan G, Cousin B, Pénicaud L, Casteilla L, Lorsignol A. Tissue Regeneration: The Dark Side of Opioids. Int J Mol Sci 2021; 22:7336. [PMID: 34298954 PMCID: PMC8307464 DOI: 10.3390/ijms22147336] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Revised: 06/25/2021] [Accepted: 06/28/2021] [Indexed: 12/13/2022] Open
Abstract
Opioids are regarded as among the most effective analgesic drugs and their use for the management of pain is considered standard of care. Despite their systematic administration in the peri-operative period, their impact on tissue repair has been studied mainly in the context of scar healing and is only beginning to be documented in the context of true tissue regeneration. Indeed, in mammals, growing evidence shows that opioids direct tissue repair towards scar healing, with a loss of tissue function, instead of the regenerative process that allows for recovery of both the morphology and function of tissue. Here, we review recent studies that highlight how opioids may prevent a regenerative process by silencing nociceptive nerve activity and a powerful anti-inflammatory effect. These data open up new perspectives for inducing tissue regeneration and argue for opioid-restricted strategies for managing pain associated with tissue injury.
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Affiliation(s)
- Cécile Dromard Berthézène
- RESTORE Research Center, INSERM, CNRS, EFS, ENVT, Université P. Sabatier, 31000 Toulouse, France; (C.D.B.); (G.J.); (B.C.); (L.P.); (L.C.)
| | - Lise Rabiller
- Alan Edwards Center for Research on Pain, Department of Physiology and Cell Information Systems, McGill University, Montreal, QC H3A 0G1, Canada;
| | - Géraldine Jourdan
- RESTORE Research Center, INSERM, CNRS, EFS, ENVT, Université P. Sabatier, 31000 Toulouse, France; (C.D.B.); (G.J.); (B.C.); (L.P.); (L.C.)
| | - Béatrice Cousin
- RESTORE Research Center, INSERM, CNRS, EFS, ENVT, Université P. Sabatier, 31000 Toulouse, France; (C.D.B.); (G.J.); (B.C.); (L.P.); (L.C.)
| | - Luc Pénicaud
- RESTORE Research Center, INSERM, CNRS, EFS, ENVT, Université P. Sabatier, 31000 Toulouse, France; (C.D.B.); (G.J.); (B.C.); (L.P.); (L.C.)
| | - Louis Casteilla
- RESTORE Research Center, INSERM, CNRS, EFS, ENVT, Université P. Sabatier, 31000 Toulouse, France; (C.D.B.); (G.J.); (B.C.); (L.P.); (L.C.)
| | - Anne Lorsignol
- RESTORE Research Center, INSERM, CNRS, EFS, ENVT, Université P. Sabatier, 31000 Toulouse, France; (C.D.B.); (G.J.); (B.C.); (L.P.); (L.C.)
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6
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Windisch KA, Kreek MJ. Review of addiction risk potential associated with adolescent opioid use. Pharmacol Biochem Behav 2020; 198:173022. [PMID: 32871141 DOI: 10.1016/j.pbb.2020.173022] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 08/18/2020] [Accepted: 08/26/2020] [Indexed: 01/31/2023]
Abstract
Adolescence is a critical period of development with robust behavioral, morphological, hormonal, and neurochemical changes including changes in brain regions implicated in the reinforcing effects of drugs such as opioids. Here we examine the preclinical and, where appropriate complementary clinical literature, for the behavioral and neurological changes induced by adolescent opioid exposure/use and their long-term consequences during adulthood. Adolescent opioid exposure results in a widened biphasic shift in reinforcement with increased impact of positive rewarding aspects during initial use and profound negative reinforcement during adulthood. Females may have enhanced vulnerability due to fast onset of antinociceptive tolerance and reduced severity of somatic withdrawal symptoms during adolescence. Overall, adolescent opioid exposure, be it legally prescribed protracted intake or illicit consumption, results in significant and prolonged consequences of increased opioid reward concomitant with reduced analgesic efficacy and exacerbated somatic withdrawal severity during opioid use/exposure in adulthood. These findings are highly relevant to physicians, parents, law makers, and the general public as adolescent opioid exposure/misuse results in heightened risk for substance use disorders.
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Affiliation(s)
- Kyle A Windisch
- Laboratory of the Biology of Addictive Diseases, The Rockefeller University, 1230 York Avenue, New York, NY 10065, USA.
| | - Mary Jeanne Kreek
- Laboratory of the Biology of Addictive Diseases, The Rockefeller University, 1230 York Avenue, New York, NY 10065, USA
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7
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Thorpe HHA, Hamidullah S, Jenkins BW, Khokhar JY. Adolescent neurodevelopment and substance use: Receptor expression and behavioral consequences. Pharmacol Ther 2019; 206:107431. [PMID: 31706976 DOI: 10.1016/j.pharmthera.2019.107431] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/30/2019] [Indexed: 12/18/2022]
Abstract
Adolescence is the transitional period between childhood and adulthood, during which extensive brain development occurs. Since this period also overlaps with the initiation of drug use, it is important to consider how substance use during this time might produce long-term neurobiological alterations, especially against the backdrop of developmental changes in neurotransmission. Alcohol, cannabis, nicotine, and opioids all produce marked changes in the expression and function of the neurotransmitter and receptor systems with which they interact. These acute and chronic alterations also contribute to behavioral consequences ranging from increased addiction risk to cognitive or neuropsychiatric behavioral dysfunctions. The current review provides an in-depth overview and update of the developmental changes in neurotransmission during adolescence, as well as the impact of drug exposure during this neurodevelopmental window. While most of these factors have been studied in animal models, which are the focus of this review, future longitudinal studies in humans that assess neural function and behavior will help to confirm pre-clinical findings. Furthermore, the neural changes induced by each drug should also be considered in the context of other contributing factors, such as sex. Further understanding of these consequences can help in the identification of novel approaches for preventing and reversing the neurobiological effects of adolescent substance use.
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Affiliation(s)
- Hayley H A Thorpe
- Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, Ontario, Canada
| | - Shahnaza Hamidullah
- Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, Ontario, Canada
| | - Bryan W Jenkins
- Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, Ontario, Canada
| | - Jibran Y Khokhar
- Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, Ontario, Canada.
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8
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Hauser KF, Knapp PE. Opiate Drugs with Abuse Liability Hijack the Endogenous Opioid System to Disrupt Neuronal and Glial Maturation in the Central Nervous System. Front Pediatr 2017; 5:294. [PMID: 29410949 PMCID: PMC5787058 DOI: 10.3389/fped.2017.00294] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Accepted: 12/20/2017] [Indexed: 01/19/2023] Open
Abstract
The endogenous opioid system, comprised of multiple opioid neuropeptide and receptor gene families, is highly expressed by developing neural cells and can significantly influence neuronal and glial maturation. In many central nervous system (CNS) regions, the expression of opioid peptides and receptors occurs only transiently during development, effectively disappearing with subsequent maturation only to reemerge under pathologic conditions, such as with inflammation or injury. Opiate drugs with abuse liability act to modify growth and development by mimicking the actions of endogenous opioids. Although typically mediated by μ-opioid receptors, opiate drugs can also act through δ- and κ-opioid receptors to modulate growth in a cell-type, region-specific, and developmentally regulated manner. Opioids act as biological response modifiers and their actions are highly contextual, plastic, modifiable, and influenced by other physiological processes or pathophysiological conditions, such as neuro-acquired immunodeficiency syndrome. To date, most studies have considered the acute effects of opiates on cellular maturation. For example, activating opioid receptors typically results in acute growth inhibition in both neurons and glia. However, with sustained opioid exposure, compensatory factors become operative, a concept that has been largely overlooked during CNS maturation. Accordingly, this article surveys prior studies on the effects of opiates on CNS maturation, and also suggests new directions for future research in this area. Identifying the cellular and molecular mechanisms underlying the adaptive responses to chronic opiate exposure (e.g., tolerance) during maturation is crucial toward understanding the consequences of perinatal opiate exposure on the CNS.
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Affiliation(s)
- Kurt F Hauser
- Department of Pharmacology and Toxicology, Virginia Commonwealth University School of Medicine, Richmond, VA, United States.,Department of Anatomy and Neurobiology, Virginia Commonwealth University School of Medicine, Richmond, VA, United States.,Institute for Drug and Alcohol Studies, Virginia Commonwealth University School of Medicine, Richmond, VA, United States
| | - Pamela E Knapp
- Department of Pharmacology and Toxicology, Virginia Commonwealth University School of Medicine, Richmond, VA, United States.,Department of Anatomy and Neurobiology, Virginia Commonwealth University School of Medicine, Richmond, VA, United States.,Institute for Drug and Alcohol Studies, Virginia Commonwealth University School of Medicine, Richmond, VA, United States
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9
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Morphine-induced conditioned place preference and effects of morphine pre-exposure in adolescent and adult male C57BL/6J mice. Psychopharmacology (Berl) 2016; 233:2015-2024. [PMID: 25066361 PMCID: PMC4310826 DOI: 10.1007/s00213-014-3695-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Accepted: 07/11/2014] [Indexed: 02/03/2023]
Abstract
RATIONALE Given the increasing abuse of prescription opioids, particularly in adolescents, surprisingly few preclinical studies have explored effects of opioids in adolescents (versus adults). OBJECTIVES This study compared the conditioned rewarding effects of morphine, without (experiment 1) and with morphine pre-exposure (experiment 2), in adolescent and adult male mice. METHODS Experiment 1: On each of three consecutive days, one of the two conditioning sessions was preceded by an injection of a particular dose of morphine (0.1, 0.32, 1, 3.2, 10, 32, or 100 mg/kg, intraperitoneal) and the other by saline; place preference was tested on day 4. Experiment 2: Mice received once daily injections of saline or a particular dose of morphine (17.8 or 56 mg/kg) for 4 days, and 3 days later, place conditioning with morphine (0.32, 1, 3.2, or 10 mg/kg) began. RESULTS In both experiments, morphine induced conditioned place preference along similar inverted U-shaped dose-response curves in adolescent and adult mice, with maximal effects between 0.32 and 10 mg/kg. Morphine pre-exposure did not sensitize morphine-induced conditioned place preference; instead, tolerance occurred, but only in adults. Adolescents were more sensitive than adults to morphine-induced locomotor stimulation. Response to novelty predicted the locomotor stimulating effects of morphine in adolescents, but not its rewarding effects. CONCLUSIONS The rewarding effects of morphine were similar in adolescent and adult mice but showed differential tolerance after morphine pre-exposure. Adolescents were more sensitive than adults to the acute locomotor stimulating effects of morphine, consistent with dopamine systems involved in locomotor activity being overactive during adolescence.
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10
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Gugusheff JR, Bae SE, Rao A, Clarke IJ, Poston L, Taylor PD, Coen CW, Muhlhausler BS. Sex and age-dependent effects of a maternal junk food diet on the mu-opioid receptor in rat offspring. Behav Brain Res 2016; 301:124-31. [DOI: 10.1016/j.bbr.2015.12.027] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Revised: 12/14/2015] [Accepted: 12/15/2015] [Indexed: 01/09/2023]
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11
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Naneix F, Darlot F, Coutureau E, Cador M. Long-lasting deficits in hedonic and nucleus accumbens reactivity to sweet rewards by sugar overconsumption during adolescence. Eur J Neurosci 2016; 43:671-80. [PMID: 26762310 DOI: 10.1111/ejn.13149] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Revised: 11/12/2015] [Accepted: 11/17/2015] [Indexed: 02/01/2023]
Abstract
Adolescence is a critical period characterized by major neurobiological changes. Chronic stimulation of the reward system might constitute an important factor in vulnerability to pathological development. In spite of the dramatic increase in the consumption of sweet palatable foods during adolescence in our modern societies, the long-term consequences of such exposure on brain reward processing remain poorly understood. Here, we investigated in rats the long-lasting effects of sugar overconsumption during their adolescence on their adult reactivity to the hedonic properties of sweet rewards. Adolescent rats with continuous access to 5% sucrose solution (from postnatal day 30-46) showed escalating intake. At adulthood (post-natal day 70), using two-bottle free choice tests, sucrose-exposed rats showed lower intake than non-exposed rats suggesting decreased sensitivity to the rewarding properties of sucrose. In Experiment 1, we tested their hedonic-related orofacial reactions to intraoral infusion of tasty solutions. We showed that sucrose-exposed rats presented less hedonic reactions in response to sweet tastes leaving the reactivity to water or quinine unaltered. Hence, in Experiment 2, we observed that this hedonic deficit is associated with lower c-Fos expression levels in the nucleus accumbens, a brain region known to play a central role in hedonic processing. These findings demonstrate that a history of high sucrose intake during the critical period of adolescence induces long-lasting deficits in hedonic treatment that may contribute to reward-related disorders.
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Affiliation(s)
- Fabien Naneix
- CNRS, Institut de Neurosciences Cognitives et Intégratives d'Aquitaine, UMR 5287, Bordeaux, France.,University of Bordeaux, Institut de Neurosciences Cognitives et Intégratives d'Aquitaine, UMR 5287, F-33076, Bordeaux, France
| | - Florence Darlot
- CNRS, Institut de Neurosciences Cognitives et Intégratives d'Aquitaine, UMR 5287, Bordeaux, France.,University of Bordeaux, Institut de Neurosciences Cognitives et Intégratives d'Aquitaine, UMR 5287, F-33076, Bordeaux, France
| | - Etienne Coutureau
- CNRS, Institut de Neurosciences Cognitives et Intégratives d'Aquitaine, UMR 5287, Bordeaux, France.,University of Bordeaux, Institut de Neurosciences Cognitives et Intégratives d'Aquitaine, UMR 5287, F-33076, Bordeaux, France
| | - Martine Cador
- CNRS, Institut de Neurosciences Cognitives et Intégratives d'Aquitaine, UMR 5287, Bordeaux, France.,University of Bordeaux, Institut de Neurosciences Cognitives et Intégratives d'Aquitaine, UMR 5287, F-33076, Bordeaux, France
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12
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Bowman SL, Soohoo AL, Shiwarski DJ, Schulz S, Pradhan AA, Puthenveedu MA. Cell-autonomous regulation of Mu-opioid receptor recycling by substance P. Cell Rep 2015; 10:1925-36. [PMID: 25801029 PMCID: PMC4494997 DOI: 10.1016/j.celrep.2015.02.045] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2014] [Revised: 10/31/2014] [Accepted: 02/18/2015] [Indexed: 10/26/2022] Open
Abstract
How neurons coordinate and reprogram multiple neurotransmitter signals is an area of broad interest. Here, we show that substance P (SP), a neuropeptide associated with inflammatory pain, reprograms opioid receptor recycling and signaling. SP, through activation of the neurokinin 1 (NK1R) receptor, increases the post-endocytic recycling of the mu-opioid receptor (MOR) in trigeminal ganglion (TG) neurons in an agonist-selective manner. SP-mediated protein kinase C (PKC) activation is both required and sufficient for increasing recycling of exogenous and endogenous MOR in TG neurons. The target of this cross-regulation is MOR itself, given that mutation of either of two PKC phosphorylation sites on MOR abolishes the SP-induced increase in recycling and resensitization. Furthermore, SP enhances the resensitization of fentanyl-induced, but not morphine-induced, antinociception in mice. Our results define a physiological pathway that cross-regulates opioid receptor recycling via direct modification of MOR and suggest a mode of homeostatic interaction between the pain and analgesic systems.
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13
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Kwok CHT, Devonshire IM, Bennett AJ, Hathway GJ. Postnatal maturation of endogenous opioid systems within the periaqueductal grey and spinal dorsal horn of the rat. Pain 2013; 155:168-178. [PMID: 24076162 PMCID: PMC3894430 DOI: 10.1016/j.pain.2013.09.022] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Revised: 09/03/2013] [Accepted: 09/20/2013] [Indexed: 12/31/2022]
Abstract
Significant opioid-dependent changes occur during the fourth postnatal week in supraspinal sites (rostroventral medulla [RVM], periaqueductal grey [PAG]) that are involved in the descending control of spinal excitability via the dorsal horn (DH). Here we report developmentally regulated changes in the opioidergic signalling within the PAG and DH, which further increase our understanding of pain processing during early life. Microinjection of the μ-opioid receptor (MOR) agonist DAMGO (30 ng) into the PAG of Sprague-Dawley rats increased spinal excitability and lowered mechanical threshold to noxious stimuli in postnatal day (P)21 rats, but had inhibitory effects in adults and lacked efficacy in P10 pups. A tonic opioidergic tone within the PAG was revealed in adult rats by intra-PAG microinjection of CTOP (120 ng, MOR antagonist), which lowered mechanical thresholds and increased spinal reflex excitability. Spinal adminstration of DAMGO inhibited spinal excitability in all ages, yet the magnitude of this was greater in younger animals than in adults. The expression of MOR and related peptides were also investigated using TaqMan real-time polymerase chain reaction and immunohistochemistry. We found that pro-opiomelanocortin peaked at P21 in the ventral PAG, and MOR increased significantly in the DH as the animals aged. Enkephalin mRNA transcripts preceded the increase in enkephalin immunoreactive fibres in the superficial dorsal horn from P21 onwards. These results illustrate that profound differences in the endogenous opioidergic signalling system occur throughout postnatal development.
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Affiliation(s)
- Charlie H T Kwok
- Laboratory of Developmental Nociception, Queens Medical Centre, University of Nottingham, Nottingham NG7 2UH, UK FRAME Laboratory, Queens Medical Centre, University of Nottingham, Nottingham NG7 2UH, UK
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14
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Niikura K, Ho A, Kreek MJ, Zhang Y. Oxycodone-induced conditioned place preference and sensitization of locomotor activity in adolescent and adult mice. Pharmacol Biochem Behav 2013; 110:112-6. [PMID: 23827650 DOI: 10.1016/j.pbb.2013.06.010] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2013] [Revised: 05/25/2013] [Accepted: 06/22/2013] [Indexed: 10/26/2022]
Abstract
Nonmedical use of the prescription opioid oxycodone has become a major public health problem in the United States, with special concern for adolescents. Although adults and adolescents have different sensitivities for drugs, little is known about the rewarding effects of oxycodone in adolescents compared to adults, even in rodent models. Here, we investigate sensitivity to oxycodone by the conditioned place preference assay of conditioned reward, and effect on the locomotor activity in adolescent (4 weeks old) and adult (10 weeks old) C57BL/6J mice. Mice of both ages were trained with multiple doses of oxycodone (0, 0.3, 1, and 3 mg/kg) and showed conditioned preference in a dose-dependent manner. The adult mice developed conditioned preference to the lowest dose tested (0.3 mg/kg), but adolescent mice did not. Dose-dependent oxycodone-induced increases in locomotor activity were observed across the conditioning session. Interestingly, adolescent mice developed greater sensitization to the locomotor-activating effects of oxycodone than adult mice. Thus differences in sensitivity to oxycodone, such as the lower initial sensitivity for conditioned preference but greater locomotor sensitization in adolescent mice, may indicate contributing factors in oxycodone abuse and later addiction in human adolescents.
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Affiliation(s)
- Keiichi Niikura
- Laboratory of the Biology of Addictive Diseases, The Rockefeller University, 1230 York Avenue, New York, NY 10065, USA.
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15
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A history of chronic morphine exposure during adolescence increases despair-like behaviour and strain-dependently promotes sociability in abstinent adult mice. Behav Brain Res 2013; 243:44-52. [PMID: 23295400 DOI: 10.1016/j.bbr.2012.12.049] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2012] [Revised: 12/20/2012] [Accepted: 12/27/2012] [Indexed: 11/22/2022]
Abstract
A crucial issue in treating opiate addiction, a chronic relapsing disorder, is to maintain a drug-free abstinent state. Prolonged abstinence associates with mood disorders, strongly contributing to relapse. In particular, substance use disorders occurring during adolescence predispose to depression later in adulthood. Using our established mouse model of opiate abstinence, we characterized emotional consequences into adulthood of morphine exposure during adolescence. Our results indicate that morphine treatment in adolescent mice has no effect on anxiety-like behaviours in adult mice, after abstinence. In contrast, morphine treatment during adolescence increases behavioural despair in adult mice. We also show that morphine exposure strain-dependently enhances sociability in adult mice. Additional research will be required to understand where and how morphine acts during brain maturation to affect emotional and social behaviours into adulthood.
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16
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Koek W, France CP, Javors MA. Morphine-induced motor stimulation, motor incoordination, and hypothermia in adolescent and adult mice. Psychopharmacology (Berl) 2012; 219:1027-37. [PMID: 21837433 PMCID: PMC3247637 DOI: 10.1007/s00213-011-2432-z] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2011] [Accepted: 07/27/2011] [Indexed: 10/17/2022]
Abstract
RATIONALE Given evidence for age-related differences in the effects of drugs of abuse, surprisingly few preclinical studies have explored effects of opioids in adolescents (versus adults). OBJECTIVES This study compared the motor stimulating, ataxic, and hypothermic effects of morphine in adolescent, late adolescent, and adult mice. Plasma and brain levels of morphine were assessed to examine possible pharmacokinetic differences among the age groups. METHODS Locomotion was measured as occlusions of horizontal infrared light beams, ataxia as failing the horizontal wire test, body temperature by rectal probe, and morphine levels by HPLC-UV. RESULTS Morphine (3.2-56 mg/kg, i.p.) increased locomotion along an inverted U-shaped dose-response curve in adolescent, late adolescent, and adult male C57BL/6J mice. Its potency to stimulate locomotion was similar in all age groups. However, maximal stimulation was higher in adolescents than in late adolescents, and higher in late adolescents than in adults. In contrast, adolescents showed less ataxia than adults when given morphine (5.6-100 mg/kg, i.p.). The hypothermic effects of morphine did not differ among the age groups. Morphine levels, which peaked in plasma at 15 min and in brain at 45 min after i.p. injection, did not show age-related differences. CONCLUSIONS The finding that adolescents are not generally more sensitive to morphine than adults, but differ in their sensitivity to effects involving nigrostriatal/mesolimbic dopamine systems, is consistent with evidence of overactivity of these dopamine systems during adolescence relative to adulthood. The age-related differences observed here are unlikely due to pharmacokinetic factors.
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Affiliation(s)
- Wouter Koek
- Department of Psychiatry, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, Mail Code 7792, San Antonio, TX 78229-3900, USA.
| | - Charles P. France
- Department of Psychiatry, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, Mail Code 7792, San Antonio, TX 78229-3900, USA. Department of Pharmacology, University of Texas Health Science Center at San Antonio, San Antonio, TX
| | - Martin A. Javors
- Department of Psychiatry, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, Mail Code 7792, San Antonio, TX 78229-3900, USA
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17
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Enhanced incentive motivation for sucrose-paired cues in adolescent rats: possible roles for dopamine and opioid systems. Neuropsychopharmacology 2011; 36:1631-43. [PMID: 21508935 PMCID: PMC3138669 DOI: 10.1038/npp.2011.44] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Vulnerability to the effects of drugs of abuse during adolescence may be related to altered incentive motivation, a process believed to be important in addiction. Incentive motivation can be seen when a neutral stimulus acquires motivational properties through repeated association with a primary reinforcer. We compared adolescent (postnatal day (PND) 24-50) and adult (>PND 70) rats on a measure of incentive motivation: responding for a conditioned reinforcer (CR). Rats learned to associate the delivery of 0.1 ml of 10% sucrose with a conditioned stimulus (CS; light and tone); 30 pairings per day were given over 14 days. Then, we measured responding on a lever delivering the CS (now a CR) after injections of amphetamine (0, 0.25 or 0.5 mg/kg). We also examined responding for CR when the CS and sucrose were paired or unpaired during conditioning, and responding for the primary reinforcer (10% sucrose) in control experiments. Finally, we examined the effects of D(1) and D(2) dopamine receptor antagonists (SCH 39166 and eticlopride, respectively) and an opioid receptor antagonist (naltrexone) on responding for a CR in adolescent rats. Adolescents but not adults acquired responding for a CR, but adolescents responded less than adults for the primary reinforcer. Responding for a CR depended upon the pairing of the CS and sucrose during conditioning. Both dopamine and opioid receptor antagonists reduced responding for the CR. Therefore, incentive motivation may be enhanced in adolescents compared with adults, and incentive motivation may be mediated in part by both dopamine and opioid systems.
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18
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Mulla H. Understanding developmental pharmacodynamics: importance for drug development and clinical practice. Paediatr Drugs 2010; 12:223-33. [PMID: 20593907 DOI: 10.2165/11319220-000000000-00000] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Developmental pharmacodynamics is the study of age-related maturation of the structure and function of biologic systems and how this affects response to pharmacotherapy. This may manifest as a change in the potency, efficacy, or therapeutic range of a drug. The paucity of studies exploring developmental pharmacodynamics reflects the lack of suitable juvenile animal models and the ethical and practical constraints of conducting studies in children. However, where data from animal models are available, valuable insight has been gained into how response to therapy can change through the course of development. For example, animal neurodevelopmental models have revealed that temporal differences in the maturation of norepinephrine and serotonin neurotransmitter systems may explain the lack of efficacy of some antidepressants in children. GABA(A) receptors that switch from an excitatory to inhibitory mode during early development help to explain paradoxical seizures experienced by infants after exposure to benzodiazepines. The increased sensitivity of neonates to morphine may be due to increased postnatal expression of the mu opioid receptor. An age dependency to the pharmacokinetic-pharmacodynamic relationship has also been found in some clinical studies. For example, immunosuppressive effects of ciclosporin (cyclosporine) revealed markedly enhanced sensitivity in infants compared with older children and adults. A study of sotalol in the treatment of children with supraventricular tachycardia showed that neonates exhibited a higher sensitivity towards QTc interval prolongation compared with older children. However, the data are limited and efforts to increase and establish data on developmental pharmacodynamics are necessary to achieve optimal drug therapy in children and to ensure long-term success of pediatric drug development. This requires a dual 'bottom up' (ontogeny knowledge driven) and 'top down' (pediatric pharmacokinetic-pharmacodynamic studies) approach.
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Affiliation(s)
- Hussain Mulla
- Centre for Therapeutic Evaluation of Drugs in Children, University Hospitals of Leicester, Leicester, UK.
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19
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Talbot JN, Skifter DA, Bianchi E, Monaghan DT, Toews ML, Murrin LC. Regulation of mu opioid receptor internalization by the scaffold protein RanBPM. Neurosci Lett 2009; 466:154-8. [PMID: 19788913 DOI: 10.1016/j.neulet.2009.09.048] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2009] [Revised: 09/24/2009] [Accepted: 09/24/2009] [Indexed: 10/20/2022]
Abstract
Mu opioid receptors (MOP) are transducers of the pharmacological effects of many opioid drugs, including analgesia and tolerance/dependence. Previously, we observed increased MOP signaling during postnatal development that was not associated with increased MOP or G protein expression. A yeast two-hybrid screen of a human brain cDNA library using the MOP C-terminus as bait identified RanBPM as a potential MOP-interacting protein. RanBPM has been recognized as a multi-functional scaffold protein that interacts with a variety of signaling receptors/proteins. Co-immunoprecipitation studies in HEK293 cells indicated that RanBPM constitutively associates with MOP. Functionally, RanBPM had no effect on MOP-mediated inhibition of adenylyl cyclase, yet reduced agonist-induced endocytosis of MOP. Mechanistically, RanBPM interfered with beta arrestin2-GFP translocation stimulated by MOP but not alpha(1B)-adrenergic receptor activation, indicating selectivity of action. Our findings suggest that RanBPM is a novel MOP-interacting protein that negatively regulates receptor internalization without altering MOP signaling through adenylyl cyclase.
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Affiliation(s)
- Jeffery N Talbot
- Department of Pharmacology and Experimental Neuroscience, 985800 Nebraska Medical Center, Omaha, NE 68198-5800, USA
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20
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Heng LJ, Yang J, Liu YH, Wang WT, Hu SJ, Gao GD. Repeated morphine exposure decreased the nucleus accumbens excitability during short-term withdrawal. Synapse 2009; 62:775-82. [PMID: 18655119 DOI: 10.1002/syn.20551] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
It is well known that the nucleus accumbens plays an important role in drug reinforcing effect and relapse. However, the cellular neuroadaptations that take place in accumbens neurons after repeated drug exposure are still not well understood, especially for opioids. Here, we examined how nucleus accumbens neuronal excitability becomes affected in rats exposed to morphine using whole-cell patch-clamp recordings. Medium spiny neurons recorded from brain slices of repeated morphine treated rats exhibited a significant decrease in the intrinsic excitability after 3-4 days withdrawal, compared to that of neurons from saline treated animals, which was indicated by the increase of current to evoke the first spike and the decrease of spike number induced by depolarizing current steps in the morphine group. Moreover, the excitability decrease was accompanied by related membrane property changes, such as resting membrane potential hyperpolarization, input resistance, and membrane time constant decrease, inward rectification increase, and action potential duration decrease. Taken together, repeated morphine exposure and short-term withdrawal may reduce nucleus accumbens activity and output by modulating intrinsic membrane properties of its output neurons, which could be an important neuroadaptation process that mediates morphine addictive effect.
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Affiliation(s)
- Li-Jun Heng
- Institute of Neuroscience, Fourth Military Medical University, Xi'an, Shaanxi 710032, People's Republic of China
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21
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Persistent inflammatory pain decreases the antinociceptive effects of the mu opioid receptor agonist DAMGO in the locus coeruleus of male rats. Neuropharmacology 2009; 56:1017-26. [PMID: 19265713 DOI: 10.1016/j.neuropharm.2009.02.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2007] [Revised: 02/14/2009] [Accepted: 02/19/2009] [Indexed: 12/18/2022]
Abstract
Persistent inflammatory nociception increases levels of endogenous opioids with affinity for delta opioid receptors in the ventromedial medulla and enhances the antinociceptive effects of the mu opioid receptor (MOPr) agonist [D-Ala2, N-Me-Phe4, Gly5-ol]enkephalin (DAMGO) [Hurley, R.W., Hammond, D.L., 2001. Contribution of endogenous enkephalins to the enhanced analgesic effects of supraspinal mu opioid receptor agonists after inflammatory injury. J. Neurosci. 21, 2536-2545]. It also increases levels of endogenous opioids that act at MOPr elsewhere in the CNS [Zangen, A., Herzberg, U., Vogel, Z., Yadid, G., 1998. Nociceptive stimulus induces release of endogenous beta-endorphin in the rat brain. Neuroscience 85, 659-662]. This study tested the hypothesis that a sustained release of endogenous opioids leads to a downregulation of MOPr in the locus coeruleus (LC) and induces a state of endogenous opioid tolerance. Four days after injection of complete Freund's adjuvant (CFA) in the left hindpaw of the rat, both the magnitude and duration of the antinociception produced by microinjection of DAMGO in the right LC were reduced. Saturation isotherms demonstrated a 50% decrease in MOPr B(max) in homogenates of the LC from CFA-treated rats; K(d) was unchanged. Receptor autoradiography revealed that this decrease was bilateral. The decreased efficacy of DAMGO in CFA-treated rats most likely results from a decreased number of MOPr in the LC. Microinjection of the MOPr antagonist D-Phe-Cys-Tyr-D-Trp-Arg-Thr-Pen-Thr-NH2 (CTAP) in the LC did not exacerbate hyperalgesia in the ipsilateral hindpaw or produce hyperalgesia in the contralateral hindpaw of CFA-treated rats. The downregulation in MOPr is therefore unlikely to result from the induction of endogenous opioid tolerance in the LC. These results indicate that persistent inflammatory nociception alters the antinociceptive actions of MOPr agonists in the CNS by diverse mechanisms that are nucleus specific and likely to have different physiological implications.
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22
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Zhang Y, Picetti R, Butelman ER, Schlussman SD, Ho A, Kreek MJ. Behavioral and neurochemical changes induced by oxycodone differ between adolescent and adult mice. Neuropsychopharmacology 2009; 34:912-22. [PMID: 18784649 PMCID: PMC3926215 DOI: 10.1038/npp.2008.134] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Nonmedical use of the prescription opioid analgesic oxycodone is a major problem in the United States, particularly among adolescents and young adults. This study characterized self-administration of oxycodone by adolescent and adult mice, and how this affects striatal dopamine levels. Male C57BL/6J mice (4 or 10 weeks old) were allowed to acquire oxycodone self-administration (0.25 mg/kg per infusion) for 9 days, and then tested with varying doses of oxycodone (0, 0.125, 0.25, 0.5, and 0.75 mg/kg per infusion). On completion of the self-administration study, a guide cannula was implanted into the striatum of these mice. Six days later, microdialysis was conducted on the freely moving mouse. After collection of baseline samples, oxycodone was administered i.p. (1.25, 2.5, and 5.0 mg/kg) and samples were collected for 1 h after each dose. Adult mice self-administered significantly more oxycodone across the doses tested. After 1 week, basal striatal dopamine levels were lower in mice of both ages that had self-administered oxycodone than in yoked saline controls. Oxycodone challenge increased striatal dopamine levels in a dose-dependent manner in both age groups. Of interest, the lowest dose of oxycodone led to increased striatal dopamine levels in the mice that had self-administered oxycodone during adolescence but not those that self-administered it as adults. The lower number of infusions of oxycodone self-administered by adolescent mice, and their later increased striatal dopamine in response to the lowest dose of oxycodone (not found in adults), suggest differential sensitivity to the reinforcing and neurobiological effects of oxycodone in the younger mice.
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Affiliation(s)
- Yong Zhang
- The Laboratory of the Biology of Addictive Diseases, The Rockefeller University, New York, NY 10065, USA.
| | - Roberto Picetti
- The Laboratory of the Biology of Addictive Diseases, The Rockefeller University, New York, NY, USA
| | - Eduardo R Butelman
- The Laboratory of the Biology of Addictive Diseases, The Rockefeller University, New York, NY, USA
| | - Stefan D Schlussman
- The Laboratory of the Biology of Addictive Diseases, The Rockefeller University, New York, NY, USA
| | - Ann Ho
- The Laboratory of the Biology of Addictive Diseases, The Rockefeller University, New York, NY, USA
| | - Mary Jeanne Kreek
- The Laboratory of the Biology of Addictive Diseases, The Rockefeller University, New York, NY, USA
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23
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Doherty J, Ogbomnwan Y, Williams B, Frantz K. Age-dependent morphine intake and cue-induced reinstatement, but not escalation in intake, by adolescent and adult male rats. Pharmacol Biochem Behav 2008; 92:164-72. [PMID: 19091300 DOI: 10.1016/j.pbb.2008.11.009] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2008] [Revised: 11/14/2008] [Accepted: 11/17/2008] [Indexed: 10/21/2022]
Abstract
Despite increasing rates of opioid abuse by human adolescents, few laboratory experiments address adolescent vulnerability to opiates. We examined intravenous morphine self-administration after adolescent- vs. adult-onset, followed by extinction and cue-induced reinstatement. Adolescent male Sprague-Dawley rats [postnatal day (P) 35 at start] and adults (P91) acquired lever pressing maintained by 0.375 mg/kg/infusion morphine on a fixed ratio one schedule of reinforcement. Subjects were subsequently divided into short or long daily access conditions (ShAcc, 1-h vs. LgAcc, 8-h; 18 sessions). After extinction, cue-induced reinstatement was recorded over 1 h. During the first six 1-h acquisition sessions and continuing throughout ShAcc conditions, adolescent-onset rats self-administered less morphine than adults, an effect commonly interpreted as higher drug sensitivity. In contrast under LgAcc conditions, escalation of morphine intake was similar across ages. Extinction of drug-seeking was similar across ages, although rats from LgAcc conditions pressed more than ShAcc conditions. Notably, cue-induced reinstatement was less robust in rats that began morphine self-administration during adolescence vs. adulthood. Although increased sensitivity of younger rats to morphine reinforcement under ShAcc conditions might help explain opioid abuse by human adolescents, lower rates of reinstatement in younger rats might suggest that adolescent development includes some protective factors that dampen the long-term impact of early drug intake.
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Affiliation(s)
- James Doherty
- Department of Biology, Georgia State University, Atlanta, GA 30302-5030, USA
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24
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López-Aranda MF, López-Téllez JF, Blanco E, Masmudi-Martín M, Navarro-Lobato I, Khan ZU. A dynamic expression pattern of sGalpha(i2) protein during early period of postnatal rat brain development. Int J Dev Neurosci 2008; 26:611-24. [PMID: 18472243 DOI: 10.1016/j.ijdevneu.2008.03.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2008] [Revised: 03/28/2008] [Accepted: 03/28/2008] [Indexed: 10/22/2022] Open
Abstract
The function of sGalphai2 protein in central nervous system is not well understood. Therefore to explore the possible role of this protein in postnatal brain development, we have analyzed the protein expression pattern of brain obtained from rats of postnatal day 0 (P0) to P90 by dot-blots and immunocytochemistry techniques. In dot-blots, both nuclear and membrane fractions showed a gradual decrease from P0 to P60. Highest protein level was observed at the age of P0. There was also a trend of decline in the sGalphai2 protein from P0 to P90 in brain sections stained by immunocytochemistry method. At P0, the protein labeling was highest in cerebral cortex, hippocampus, cerebellum and mitral cell layer. In cerebral cortex, a drop in the immunolabeling of sGalphai2 protein was observed at P3, which was significantly increased at the age of P5. However, in striatum and olfactory tubercle, it was maintained through P0-P10 and P0-P5, respectively. Thalamus was one of the areas where labeling was not as strong as cortex, hippocampus or striatum. In contrary to other areas, immunostaining of sGalphai2 in corpus-callosum and lacunosum-molecular was not seen at P0 and appeared in advanced postnatal ages. A detectable level of sGalphai2 protein was observed at P5 in carpus-callosum and at P20 in lacunosum-molecular. A high level of sGalphai2 protein in the period when cellular layer organization and synaptic innervations, synaptic connections and maturation take place, suggests for a potential role of this protein in the early postnatal brain development.
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Affiliation(s)
- Manuel F López-Aranda
- Laboratory of Neurobiology, CIMES, Faculty of Medicine, University of Malaga, Campus Teatinos s/n, Malaga 29071, Spain.
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25
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GTPgammaS incorporation in the rat brain: a study on mu-opioid receptors and CXCR4. J Neuroimmune Pharmacol 2007; 3:26-34. [PMID: 18247130 DOI: 10.1007/s11481-007-9083-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2007] [Accepted: 07/30/2007] [Indexed: 12/20/2022]
Abstract
Chemokine and opioid receptors are G-protein-coupled receptors that play important roles in both the central nervous system and the immune system. The long-term goal of our research is to establish whether opioids regulate the activity of the chemokine receptor CXCR4 (one of the major HIV co-receptors) in the brain. In this research, we studied the anatomical distribution of functional receptors in young and adult animals by using the [(35)S]GTPgammaS "binding" assay as an indication of G-protein activation by CXCL12 (the natural CXCR4 ligand) or by mu-opioid agonists. Brain slices or homogenates from Holtzmann rats of different ages (from 2 to 21 days old and adult animals) were treated with CXCL12 (0.001-100 nM), D: -ala2,MePhe4,gly-ol5]enkephalin (DAMGO; 0.0003-10 microM) or morphine (0.0003-10 microM) and then processed for the assay. Our results show stimulation of both mu-OR and CXCR4 in several brain areas, including cortex and hippocampus (p < 0.001); this effect is dose and age dependent, and the magnitude of response varies among different brain regions. Furthermore, AMD3100 (100 ng/ml), a specific CXCR4 antagonist, abolished CXCL12 stimulation in all the brain regions analyzed (p < 0.001). Our findings suggest a similar pattern of expression for mu-OR and CXCR4 in the brain, supporting the possibility of an interaction between the two G-protein-coupled receptors in vivo. This might be relevant to the role of opiates in HIV neuropathogenesis.
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Abstract
This paper is the 28th consecutive installment of the annual review of research concerning the endogenous opioid system, now spanning over a quarter-century of research. It summarizes papers published during 2005 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 (Section 2), and the roles of these opioid peptides and receptors in pain and analgesia (Section 3); stress and social status (Section 4); tolerance and dependence (Section 5); learning and memory (Section 6); eating and drinking (Section 7); alcohol and drugs of abuse (Section 8); sexual activity and hormones, pregnancy, development and endocrinology (Section 9); mental illness and mood (Section 10); seizures and neurologic disorders (Section 11); electrical-related activity, neurophysiology and transmitter release (Section 12); general activity and locomotion (Section 13); gastrointestinal, renal and hepatic functions (Section 14); cardiovascular responses (Section 15); respiration and thermoregulation (Section 16); immunological responses (Section 17).
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Affiliation(s)
- Richard J Bodnar
- Department of Psychology and Neuropsychology Doctoral Sub-Program, Queens College, City University of New York, 65-30 Kissena Blvd., Flushing, NY 11367, USA.
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27
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Endoh T. Pharmacological characterization of inhibitory effects of postsynaptic opioid and cannabinoid receptors on calcium currents in neonatal rat nucleus tractus solitarius. Br J Pharmacol 2006; 147:391-401. [PMID: 16402042 PMCID: PMC1616990 DOI: 10.1038/sj.bjp.0706623] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2005] [Accepted: 11/15/2005] [Indexed: 12/19/2022] Open
Abstract
1. The profile of opioid and cannabinoid receptors in neurons of the nucleus tractus solitarius (NTS) has been studied using the whole-cell configuration of the patch clamp technique. 2. Experiments with selective agonists and antagonists of opioid, ORL and cannabinoid receptors indicated that mu-opioid, kappa-opioid, ORL-1 and CB1, but not delta-opioid, receptors inhibit VDCCs in NTS. 3. Application of [D-Ala2, N-Me-Phe4, Gly5-ol]-enkephalin (DAMGO; mu-opioid receptor agonist), Orphanin FQ (ORL-1 receptor agonist) and WIN55,122 (CB1 receptor agonist) caused inhibition of I(Ba) in a concentration-dependent manner, with IC50's of 390 nM, 220 nM and 2.2 microM, respectively. 4. Intracellular dialysis of the G(i)-protein antibody attenuated DAMGO-, Orphanin FQ- and WIN55,122-induced inhibition of I(Ba). 5. Both pretreatment with adenylate cyclase inhibitor and intracellular dialysis of the protein kinase A (PKA) inhibitor attenuated WIN55,122-induced inhibition of I(Ba) but not DAMGO- and Orphanin FQ-induced inhibition. 6. Mainly N- and P/Q-type VDCCs were inhibited by both DAMGO and Orphanin FQ, while L-type VDCCs were inhibited by WIN55,122. 7. These results suggest that mu- and kappa-opioid receptors and ORL-1 receptor inhibit N- and P/Q-type VDCCs via G alpha(i)-protein betagamma subunits, whereas CB1 receptors inhibit L-type VDCCs via G alpha(i)-proteins involving PKA in NTS.
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MESH Headings
- Animals
- Animals, Newborn
- Calcium/physiology
- Calcium Channels/classification
- Calcium Channels/drug effects
- Calcium Channels/metabolism
- Calcium Channels, L-Type/drug effects
- Calcium Channels, L-Type/metabolism
- Calcium Channels, P-Type/drug effects
- Calcium Channels, P-Type/metabolism
- Calcium Channels, Q-Type/drug effects
- Calcium Channels, Q-Type/metabolism
- Cannabinoid Receptor Antagonists
- Enkephalin, Ala(2)-MePhe(4)-Gly(5)-/pharmacology
- Kinetics
- Narcotic Antagonists
- Opioid Peptides/pharmacology
- Patch-Clamp Techniques
- Rats
- Rats, Wistar
- Receptors, Cannabinoid/drug effects
- Receptors, Cannabinoid/genetics
- Receptors, Opioid/agonists
- Receptors, Opioid/drug effects
- Receptors, Opioid/genetics
- Receptors, Opioid, kappa/agonists
- Receptors, Opioid, kappa/antagonists & inhibitors
- Receptors, Opioid, kappa/drug effects
- Receptors, Opioid, mu/agonists
- Receptors, Opioid, mu/antagonists & inhibitors
- Receptors, Opioid, mu/drug effects
- Solitary Nucleus/cytology
- Solitary Nucleus/metabolism
- Nociceptin
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Affiliation(s)
- Takayuki Endoh
- Department of Physiology, Tokyo Dental College, 1-2-2 Masago, Mihama-ku, Chiba 261-8502, Japan.
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