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Mwobobia RM, Kanui TI, Abelson KSP. The effects of clonidine and yohimbine in the tail flick and hot plate tests in the naked mole rat (Heterocephalus glaber). BMC Res Notes 2021; 14:191. [PMID: 34001271 PMCID: PMC8130107 DOI: 10.1186/s13104-021-05607-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Accepted: 05/08/2021] [Indexed: 11/10/2022] Open
Abstract
Objective The naked mole rat (NMR) (Heterocephalus glaber) is increasingly considered an important biomedical research model for various conditions like hypoxic brain injury, cancer and nociception. This study was designed to investigate the effects of clonidine and yohimbine, an alpha-2 (α2) adrenoceptor agonist and antagonist respectively in the tail flick and hot plate tests. Results A significant difference in tail flick latency was noted between saline control and 30 µg/kg clonidine, which was reduced after administration of 30 µg/kg yohimbine. A significant difference in hot plate latency was also noted between saline control and 30 µg/kg clodinine during the periods 30, 45, 60, 75 and 90 min after administration, and between saline control and 10 µg/kg clonidine during 30 min after administration. The hot plate latency by 30 µg/kg clonidine was also reduced by 30 µg/kg yohimbine during 30 min after administration. Since the tail-flick and hot plate tests mediate the effects at spinal and supraspinal levels respectively, the present study indicates the presence and involvement of noradrenergic receptors in thermal antinociception at spinal and supraspinal levels of the NMR, similar to what has been found in other mammals.
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Affiliation(s)
- R M Mwobobia
- School of Agriculture and Veterinary Sciences, South Eastern Kenya University, P O Box 170-90200, Kitui, Kenya. .,Department of Experimental Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamvej 3B, 2200, Copenhagen, Denmark.
| | - T I Kanui
- School of Agriculture and Veterinary Sciences, South Eastern Kenya University, P O Box 170-90200, Kitui, Kenya
| | - K S P Abelson
- Department of Experimental Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamvej 3B, 2200, Copenhagen, Denmark
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2
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The Somatosensory World of the African Naked Mole-Rat. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021; 1319:197-220. [PMID: 34424517 DOI: 10.1007/978-3-030-65943-1_7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The naked mole-rat (Heterocephalus glaber) is famous for its longevity and unusual physiology. This eusocial species that lives in highly ordered and hierarchical colonies with a single breeding queen, also discovered secrets enabling somewhat pain-free living around 20 million years ago. Unlike most mammals, naked mole-rats do not feel the burn of chili pepper's active ingredient, capsaicin, nor the sting of acid. Indeed, by accumulating mutations in genes encoding proteins that are only now being exploited as targets for new pain therapies (the nerve growth factor receptor TrkA and voltage-gated sodium channel, NaV1.7), this species mastered the art of analgesia before humans evolved. Recently, we have identified pain-insensitivity as a trait shared by several closely related African mole-rat species. In this chapter we will show how African mole-rats have evolved pain insensitivity as well as discussing what the proximate factors may have been that led to the evolution of pain-free traits.
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3
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Baamonde A, Menéndez L, González-Rodríguez S, Lastra A, Seitz V, Stein C, Machelska H. A low pKa ligand inhibits cancer-associated pain in mice by activating peripheral mu-opioid receptors. Sci Rep 2020; 10:18599. [PMID: 33122720 PMCID: PMC7596718 DOI: 10.1038/s41598-020-75509-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Accepted: 10/15/2020] [Indexed: 01/08/2023] Open
Abstract
The newly designed fentanyl derivative [( ±)-N-(3-fluoro-1-phenethylpiperidine-4-yl)-N-phenyl propionamide] (NFEPP) was recently shown to produce analgesia selectively via peripheral mu-opioid receptors (MOR) at acidic pH in rat inflamed tissues. Here, we examined the pH-dependency of NFEPP binding to brain MOR and its effects on bone cancer-induced pain in mice. The IC50 of NFEPP to displace bound [3H]-DAMGO was significantly higher compared to fentanyl at pH 7.4, but no differences were observed at pH 5.5 or 6.5. Intravenous NFEPP (30-100 nmol/kg) or fentanyl (17-30 nmol/kg) inhibited heat hyperalgesia in mice inoculated with B16-F10 melanoma cells. The peripherally-restricted opioid receptor antagonist naloxone-methiodide reversed the effect of NFEPP (100 nmol/kg), but not of fentanyl (30 nmol/kg). The antihyperalgesic effect of NFEPP was abolished by a selective MOR- (cyprodime), but not delta- (naltrindole) or kappa- (nor-binaltorphimine) receptor antagonists. Ten-fold higher doses of NFEPP than fentanyl induced maximal antinociception in mice without tumors, which was reversed by the non-restricted antagonist naloxone, but not by naloxone-methiodide. NFEPP also reduced heat hyperalgesia produced by fibrosarcoma- (NCTC 2472) or prostate cancer-derived (RM1) cells. These data demonstrate the increased affinity of NFEPP for murine MOR at low pH, and its ability to inhibit bone cancer-induced hyperalgesia through peripheral MOR. In mice, central opioid receptors may be activated by ten-fold higher doses of NFEPP.
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Affiliation(s)
- Ana Baamonde
- Laboratorio de Farmacología, Facultad de Medicina, Instituto Universitario de Oncología del Principado de Asturias (IUOPA), Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Universidad de Oviedo, C/Julián Clavería 6, 33006, Oviedo, Asturias, Spain.
| | - Luis Menéndez
- Laboratorio de Farmacología, Facultad de Medicina, Instituto Universitario de Oncología del Principado de Asturias (IUOPA), Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Universidad de Oviedo, C/Julián Clavería 6, 33006, Oviedo, Asturias, Spain
| | - Sara González-Rodríguez
- Laboratorio de Farmacología, Facultad de Medicina, Instituto Universitario de Oncología del Principado de Asturias (IUOPA), Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Universidad de Oviedo, C/Julián Clavería 6, 33006, Oviedo, Asturias, Spain
| | - Ana Lastra
- Laboratorio de Farmacología, Facultad de Medicina, Instituto Universitario de Oncología del Principado de Asturias (IUOPA), Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Universidad de Oviedo, C/Julián Clavería 6, 33006, Oviedo, Asturias, Spain
| | - Viola Seitz
- Department of Experimental Anesthesiology, Charité-Universitätsmedizin Berlin, Campus Benjamin Franklin, Hindenburgdamm 30, 12203, Berlin, Germany
- Institute of Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14474, Potsdam, Germany
| | - Christoph Stein
- Department of Experimental Anesthesiology, Charité-Universitätsmedizin Berlin, Campus Benjamin Franklin, Hindenburgdamm 30, 12203, Berlin, Germany
| | - Halina Machelska
- Department of Experimental Anesthesiology, Charité-Universitätsmedizin Berlin, Campus Benjamin Franklin, Hindenburgdamm 30, 12203, Berlin, Germany
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4
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pK a of opioid ligands as a discriminating factor for side effects. Sci Rep 2019; 9:19344. [PMID: 31852967 PMCID: PMC6920366 DOI: 10.1038/s41598-019-55886-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Accepted: 12/03/2019] [Indexed: 01/18/2023] Open
Abstract
The non-selective activation of central and peripheral opioid receptors is a major shortcoming of currently available opioids. Targeting peripheral opioid receptors is a promising strategy to preclude side effects. Recently, we showed that fentanyl-derived μ-opioid receptor (MOR) agonists with reduced acid dissociation constants (pKa) due to introducing single fluorine atoms produced injury-restricted antinociception in rat models of inflammatory, postoperative and neuropathic pain. Here, we report that a new double-fluorinated compound (FF6) and fentanyl show similar pKa, MOR affinity and [35S]-GTPγS binding at low and physiological pH values. In vivo, FF6 produced antinociception in injured and non-injured tissue, and induced sedation and constipation. The comparison of several fentanyl derivatives revealed a correlation between pKa values and pH-dependent MOR activation, antinociception and side effects. An opioid ligand’s pKa value may be used as discriminating factor to design safer analgesics.
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Abstract
INTRODUCTION Opioids are the oldest and most potent drugs for the treatment of severe pain, but they are burdened by detrimental side effects such as respiratory depression, addiction, sedation, nausea, and constipation. Their clinical application is undisputed in acute (e.g. perioperative) and cancer pain, but their long-term use in chronic pain has met increasing scrutiny and has contributed to the current 'opioid crisis.' AREAS COVERED This article reviews pharmacological principles and research strategies aiming at novel opioids with reduced side effects. Basic mechanisms underlying pain, opioid analgesia, and other opioid actions are outlined. To illustrate the clinical situation and medical needs, plasticity of opioid receptors, intracellular signaling pathways, endogenous and exogenous opioid receptor ligands, central and peripheral sites of analgesic, and side effects are discussed. EXPERT OPINION The epidemic of opioid misuse has taught us that there is a lack of fundamental knowledge about the characteristics and management of chronic pain, that conflicts of interest and validity of models must be considered in the context of drug development, and that novel analgesics with less abuse liability are badly needed. Currently, the most promising perspectives appear to be augmenting endogenous opioid actions and selectively targeting pathological conformations of peripheral opioid receptors.
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Affiliation(s)
- Christoph Stein
- a Department of Anesthesiology and Intensive Care Medicine Campus Benjamin Franklin , Charité Universitätsmedizin , Berlin , Germany
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Spahn V, Del Vecchio G, Rodriguez-Gaztelumendi A, Temp J, Labuz D, Kloner M, Reidelbach M, Machelska H, Weber M, Stein C. Opioid receptor signaling, analgesic and side effects induced by a computationally designed pH-dependent agonist. Sci Rep 2018; 8:8965. [PMID: 29895890 PMCID: PMC5997768 DOI: 10.1038/s41598-018-27313-4] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Accepted: 05/31/2018] [Indexed: 12/26/2022] Open
Abstract
Novel pain killers without adverse effects are urgently needed. Opioids induce central and intestinal side effects such as respiratory depression, sedation, addiction, and constipation. We have recently shown that a newly designed agonist with a reduced acid dissociation constant (pKa) abolished pain by selectively activating peripheral μ-opioid receptors (MOR) in inflamed (acidic) tissues without eliciting side effects. Here, we extended this concept in that pKa reduction to 7.22 was achieved by placing a fluorine atom at the ethylidene bridge in the parental molecule fentanyl. The new compound (FF3) showed pH-sensitive MOR affinity, [35S]-GTPγS binding, and G protein dissociation by fluorescence resonance energy transfer. It produced injury-restricted analgesia in rat models of inflammatory, postoperative, abdominal, and neuropathic pain. At high dosages, FF3 induced sedation, motor disturbance, reward, constipation, and respiratory depression. These results support our hypothesis that a ligand’s pKa should be close to the pH of injured tissue to obtain analgesia without side effects.
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Affiliation(s)
- Viola Spahn
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Anesthesiology and Intensive Care Medicine, Campus Benjamin Franklin, Hindenburgdamm 30, 12203, Berlin, Germany
| | - Giovanna Del Vecchio
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Anesthesiology and Intensive Care Medicine, Campus Benjamin Franklin, Hindenburgdamm 30, 12203, Berlin, Germany
| | - Antonio Rodriguez-Gaztelumendi
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Anesthesiology and Intensive Care Medicine, Campus Benjamin Franklin, Hindenburgdamm 30, 12203, Berlin, Germany.,Department of Drug Discovery and In Vitro Pharmacology, Laboratorios Dr. Esteve, Parc Científic de Barcelona, Barcelona, Spain
| | - Julia Temp
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Anesthesiology and Intensive Care Medicine, Campus Benjamin Franklin, Hindenburgdamm 30, 12203, Berlin, Germany
| | - Dominika Labuz
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Anesthesiology and Intensive Care Medicine, Campus Benjamin Franklin, Hindenburgdamm 30, 12203, Berlin, Germany
| | - Michael Kloner
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Anesthesiology and Intensive Care Medicine, Campus Benjamin Franklin, Hindenburgdamm 30, 12203, Berlin, Germany
| | - Marco Reidelbach
- Freie Universität Berlin, Institute of Theoretical Physics, Arnimallee 14, 14195, Berlin, Germany
| | - Halina Machelska
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Anesthesiology and Intensive Care Medicine, Campus Benjamin Franklin, Hindenburgdamm 30, 12203, Berlin, Germany
| | - Marcus Weber
- Zuse Institute Berlin, Computational Molecular Design, Takustraße 7, 14195, Berlin, Germany
| | - Christoph Stein
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Anesthesiology and Intensive Care Medicine, Campus Benjamin Franklin, Hindenburgdamm 30, 12203, Berlin, Germany.
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Spahn V, Del Vecchio G, Labuz D, Rodriguez-Gaztelumendi A, Massaly N, Temp J, Durmaz V, Sabri P, Reidelbach M, Machelska H, Weber M, Stein C. A nontoxic pain killer designed by modeling of pathological receptor conformations. Science 2017; 355:966-969. [PMID: 28254944 DOI: 10.1126/science.aai8636] [Citation(s) in RCA: 157] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Accepted: 01/30/2017] [Indexed: 12/12/2022]
Abstract
Indiscriminate activation of opioid receptors provides pain relief but also severe central and intestinal side effects. We hypothesized that exploiting pathological (rather than physiological) conformation dynamics of opioid receptor-ligand interactions might yield ligands without adverse actions. By computer simulations at low pH, a hallmark of injured tissue, we designed an agonist that, because of its low acid dissociation constant, selectively activates peripheral μ-opioid receptors at the source of pain generation. Unlike the conventional opioid fentanyl, this agonist showed pH-sensitive binding, heterotrimeric guanine nucleotide-binding protein (G protein) subunit dissociation by fluorescence resonance energy transfer, and adenosine 3',5'-monophosphate inhibition in vitro. It produced injury-restricted analgesia in rats with different types of inflammatory pain without exhibiting respiratory depression, sedation, constipation, or addiction potential.
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Affiliation(s)
- V Spahn
- Department of Anesthesiology and Critical Care Medicine, Charité-Universitätsmedizin Berlin Campus Benjamin Franklin, Freie Universität Berlin, Hindenburgdamm 30, Berlin 12203, Germany
| | - G Del Vecchio
- Department of Anesthesiology and Critical Care Medicine, Charité-Universitätsmedizin Berlin Campus Benjamin Franklin, Freie Universität Berlin, Hindenburgdamm 30, Berlin 12203, Germany
| | - D Labuz
- Department of Anesthesiology and Critical Care Medicine, Charité-Universitätsmedizin Berlin Campus Benjamin Franklin, Freie Universität Berlin, Hindenburgdamm 30, Berlin 12203, Germany
| | - A Rodriguez-Gaztelumendi
- Department of Anesthesiology and Critical Care Medicine, Charité-Universitätsmedizin Berlin Campus Benjamin Franklin, Freie Universität Berlin, Hindenburgdamm 30, Berlin 12203, Germany
| | - N Massaly
- Department of Anesthesiology and Critical Care Medicine, Charité-Universitätsmedizin Berlin Campus Benjamin Franklin, Freie Universität Berlin, Hindenburgdamm 30, Berlin 12203, Germany
| | - J Temp
- Department of Anesthesiology and Critical Care Medicine, Charité-Universitätsmedizin Berlin Campus Benjamin Franklin, Freie Universität Berlin, Hindenburgdamm 30, Berlin 12203, Germany
| | - V Durmaz
- Computational Molecular Design, Zuse-Institut Berlin, Takustrasse 7, Berlin, 14195, Germany
| | - P Sabri
- Computational Molecular Design, Zuse-Institut Berlin, Takustrasse 7, Berlin, 14195, Germany
| | - M Reidelbach
- Computational Molecular Design, Zuse-Institut Berlin, Takustrasse 7, Berlin, 14195, Germany
| | - H Machelska
- Department of Anesthesiology and Critical Care Medicine, Charité-Universitätsmedizin Berlin Campus Benjamin Franklin, Freie Universität Berlin, Hindenburgdamm 30, Berlin 12203, Germany
| | - M Weber
- Computational Molecular Design, Zuse-Institut Berlin, Takustrasse 7, Berlin, 14195, Germany
| | - C Stein
- Department of Anesthesiology and Critical Care Medicine, Charité-Universitätsmedizin Berlin Campus Benjamin Franklin, Freie Universität Berlin, Hindenburgdamm 30, Berlin 12203, Germany.
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Sonnabend A, Spahn V, Stech M, Zemella A, Stein C, Kubick S. Production of G protein-coupled receptors in an insect-based cell-free system. Biotechnol Bioeng 2017; 114:2328-2338. [PMID: 28574582 PMCID: PMC5599999 DOI: 10.1002/bit.26346] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Revised: 04/21/2017] [Accepted: 05/31/2017] [Indexed: 02/06/2023]
Abstract
The biochemical analysis of human cell membrane proteins remains a challenging task due to the difficulties in producing sufficient quantities of functional protein. G protein‐coupled receptors (GPCRs) represent a main class of membrane proteins and drug targets, which are responsible for a huge number of signaling processes regulating various physiological functions in living cells. To circumvent the current bottlenecks in GPCR studies, we propose the synthesis of GPCRs in eukaryotic cell‐free systems based on extracts generated from insect (Sf21) cells. Insect cell lysates harbor the fully active translational and translocational machinery allowing posttranslational modifications, such as glycosylation and phosphorylation of de novo synthesized proteins. Here, we demonstrate the production of several GPCRs in a eukaryotic cell‐free system, performed within a short time and in a cost‐effective manner. We were able to synthesize a variety of GPCRs ranging from 40 to 133 kDa in an insect‐based cell‐free system. Moreover, we have chosen the μ opioid receptor (MOR) as a model protein to analyze the ligand binding affinities of cell‐free synthesized MOR in comparison to MOR expressed in a human cell line by “one‐point” radioligand binding experiments. Biotechnol. Bioeng. 2017;114: 2328–2338. © 2017 The Authors. Biotechnology and Bioengineering Published by Wiley Periodicals, Inc.
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Affiliation(s)
- Andrei Sonnabend
- Fraunhofer Institute for Cell Therapy and Immunology (IZI), Branch Bioanalysis and Bioprocesses Potsdam-Golm (IZI-BB), Am Muehlenberg 13, Potsdam 14476, Germany
| | - Viola Spahn
- Department of Anesthesiology and Intensive Care Medicine, Charité-Universitätsmedizin Berlin, Campus Benjamin Franklin, Berlin, Germany
| | - Marlitt Stech
- Fraunhofer Institute for Cell Therapy and Immunology (IZI), Branch Bioanalysis and Bioprocesses Potsdam-Golm (IZI-BB), Am Muehlenberg 13, Potsdam 14476, Germany
| | - Anne Zemella
- Fraunhofer Institute for Cell Therapy and Immunology (IZI), Branch Bioanalysis and Bioprocesses Potsdam-Golm (IZI-BB), Am Muehlenberg 13, Potsdam 14476, Germany
| | - Christoph Stein
- Department of Anesthesiology and Intensive Care Medicine, Charité-Universitätsmedizin Berlin, Campus Benjamin Franklin, Berlin, Germany
| | - Stefan Kubick
- Fraunhofer Institute for Cell Therapy and Immunology (IZI), Branch Bioanalysis and Bioprocesses Potsdam-Golm (IZI-BB), Am Muehlenberg 13, Potsdam 14476, Germany
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Abstract
Opioids are the oldest and most potent drugs for the treatment of severe pain. Their clinical application is undisputed in acute (e.g., postoperative) and cancer pain, but their long-term use in chronic pain has met increasing scrutiny. This article reviews mechanisms underlying opioid analgesia and other opioid actions. It discusses the structure, function, and plasticity of opioid receptors; the central and peripheral sites of analgesic actions and side effects; endogenous and exogenous opioid receptor ligands; and conventional and novel opioid compounds. Challenging clinical situations, such as the tension between chronic pain and addiction, are also illustrated.
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Affiliation(s)
- Christoph Stein
- Department of Anesthesiology and Critical Care Medicine, Freie Universität Berlin, Charité Campus Benjamin Franklin, 12200 Berlin, Germany; .,Helmholtz Virtual Institute, Multifunctional Biomaterials for Medicine, 14513 Teltow, Germany
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10
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Abstract
This paper is the thirty-sixth consecutive installment of the annual review of research concerning the endogenous opioid system. It summarizes papers published during 2013 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; alcohol and drugs of abuse; 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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