1
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Rodriguez S, Sharma S, Tiarks G, Peterson Z, Jackson K, Thedens D, Wong A, Keffala-Gerhard D, Mahajan VB, Ferguson PJ, Newell EA, Glykys J, Nickl-Jockschat T, Bassuk AG. Neuroprotective effects of naltrexone in a mouse model of post-traumatic seizures. Sci Rep 2024; 14:13507. [PMID: 38867062 PMCID: PMC11169394 DOI: 10.1038/s41598-024-63942-8] [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: 01/30/2024] [Accepted: 06/03/2024] [Indexed: 06/14/2024] Open
Abstract
Traumatic Brain Injury (TBI) induces neuroinflammatory response that can initiate epileptogenesis, which develops into epilepsy. Recently, we identified anti-convulsive effects of naltrexone, a mu-opioid receptor (MOR) antagonist, used to treat drug addiction. While blocking opioid receptors can reduce inflammation, it is unclear if post-TBI seizures can be prevented by blocking MORs. Here, we tested if naltrexone prevents neuroinflammation and/or seizures post-TBI. TBI was induced by a modified Marmarou Weight-Drop (WD) method on 4-week-old C57BL/6J male mice. Mice were placed in two groups: non-telemetry assessing the acute effects or in telemetry monitoring for interictal events and spontaneous seizures both following TBI and naltrexone. Molecular, histological and neuroimaging techniques were used to evaluate neuroinflammation, neurodegeneration and fiber track integrity at 8 days and 3 months post-TBI. Peripheral immune responses were assessed through serum chemokine/cytokine measurements. Our results show an increase in MOR expression, nitro-oxidative stress, mRNA expression of inflammatory cytokines, microgliosis, neurodegeneration, and white matter damage in the neocortex of TBI mice. Video-EEG revealed increased interictal events in TBI mice, with 71% mice developing post-traumatic seizures (PTS). Naltrexone treatment ameliorated neuroinflammation, neurodegeneration, reduced interictal events and prevented seizures in all TBI mice, which makes naltrexone a promising candidate against PTS, TBI-associated neuroinflammation and epileptogenesis in a WD model of TBI.
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Affiliation(s)
- Saul Rodriguez
- Stead Family Department of Pediatrics , Carver College of Medicine, University of Iowa, 25 South Grand Ave, 2040 MedLabs, Iowa City, IA, 52242, USA
| | - Shaunik Sharma
- Stead Family Department of Pediatrics , Carver College of Medicine, University of Iowa, 25 South Grand Ave, 2040 MedLabs, Iowa City, IA, 52242, USA
| | - Grant Tiarks
- Stead Family Department of Pediatrics , Carver College of Medicine, University of Iowa, 25 South Grand Ave, 2040 MedLabs, Iowa City, IA, 52242, USA
| | - Zeru Peterson
- Department of Psychiatry, University of Iowa, Iowa City, IA, USA
| | - Kyle Jackson
- Stead Family Department of Pediatrics , Carver College of Medicine, University of Iowa, 25 South Grand Ave, 2040 MedLabs, Iowa City, IA, 52242, USA
| | - Daniel Thedens
- Department of Radiology, University of Iowa, Iowa City, IA, USA
| | - Angela Wong
- Stead Family Department of Pediatrics , Carver College of Medicine, University of Iowa, 25 South Grand Ave, 2040 MedLabs, Iowa City, IA, 52242, USA
| | - David Keffala-Gerhard
- Stead Family Department of Pediatrics , Carver College of Medicine, University of Iowa, 25 South Grand Ave, 2040 MedLabs, Iowa City, IA, 52242, USA
| | - Vinit B Mahajan
- Department of Ophthalmology, Stanford University, Palo Alto, CA, USA
| | - Polly J Ferguson
- Stead Family Department of Pediatrics , Carver College of Medicine, University of Iowa, 25 South Grand Ave, 2040 MedLabs, Iowa City, IA, 52242, USA
| | - Elizabeth A Newell
- Stead Family Department of Pediatrics , Carver College of Medicine, University of Iowa, 25 South Grand Ave, 2040 MedLabs, Iowa City, IA, 52242, USA
| | - Joseph Glykys
- Stead Family Department of Pediatrics , Carver College of Medicine, University of Iowa, 25 South Grand Ave, 2040 MedLabs, Iowa City, IA, 52242, USA
- Iowa Neuroscience Institute, University of Iowa, Iowa City, IA, USA
- Department of Neurology, University of Iowa, Iowa City, IA, USA
| | - Thomas Nickl-Jockschat
- Department of Psychiatry, University of Iowa, Iowa City, IA, USA
- Iowa Neuroscience Institute, University of Iowa, Iowa City, IA, USA
- Department of Psychiatry and Psychotherapy, Otto-von-Guericke University, Magdeburg, Germany German Center for Mental Health (DZPG), partner site Halle-Jena-Magdeburg, Germany Center for Intervention and Research on adaptive and maladaptive brain Circuits underlying mental health (C-I-R-C), Halle-Jena-Magdeburg, Germany
| | - Alexander G Bassuk
- Stead Family Department of Pediatrics , Carver College of Medicine, University of Iowa, 25 South Grand Ave, 2040 MedLabs, Iowa City, IA, 52242, USA.
- Iowa Neuroscience Institute, University of Iowa, Iowa City, IA, USA.
- Department of Neurology, University of Iowa, Iowa City, IA, USA.
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Miyoshi K, Shimizu S, Shiraki A, Egi M. Ubiquitination of the μ-opioid receptor regulates receptor internalization without affecting G i/o-mediated intracellular signaling or receptor phosphorylation. Biochem Biophys Res Commun 2023; 643:96-104. [PMID: 36592585 DOI: 10.1016/j.bbrc.2022.12.077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Accepted: 12/26/2022] [Indexed: 12/29/2022]
Abstract
Opioids are highly potent analgesics but develop tolerance. Previous studies have focused on phosphorylation of the μ-opioid receptor as it is involved in maintaining cellular sensitivity via desensitization, recycling, and degradation of the activated receptor. Recently, ubiquitination, another form of posttranslational modification has attracted attention in terms of triggering intracellular signaling and regulation of the activated receptor. Here, we generated a ubiquitination-deficient mutant of the μ-opioid receptor to investigate whether ubiquitination is involved in driving Gi/o-mediated analgesic signaling, receptor desensitization or subsequent receptor internalization. Our study shows that the Gi/o pathway and receptor phosphorylation do not require ubiquitination. Instead, ubiquitination regulates the internalization efficiency and might help in promoting internalization of the desensitized MOP.
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Affiliation(s)
- Kentaro Miyoshi
- Department of Anesthesia, Kyoto University Hospital, 54 Shogoin-kawahara-cho, Sakyo-ku, Kyoto City, Kyoto Prefecture, Japan
| | - Satoshi Shimizu
- Department of Anesthesia, Kyoto University Hospital, 54 Shogoin-kawahara-cho, Sakyo-ku, Kyoto City, Kyoto Prefecture, Japan; Department of Anesthesiology, Shiga University of Medical Science Setatsukinowacho, Otsu City, Shiga Prefecture, Japan.
| | - Atsuko Shiraki
- Department of Anesthesia, Kyoto University Hospital, 54 Shogoin-kawahara-cho, Sakyo-ku, Kyoto City, Kyoto Prefecture, Japan
| | - Moritoki Egi
- Department of Anesthesia, Kyoto University Hospital, 54 Shogoin-kawahara-cho, Sakyo-ku, Kyoto City, Kyoto Prefecture, Japan
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3
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Vandeputte MM, Vasudevan L, Stove CP. In vitro functional assays as a tool to study new synthetic opioids at the μ-opioid receptor: Potential, pitfalls and progress. Pharmacol Ther 2022; 235:108161. [DOI: 10.1016/j.pharmthera.2022.108161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 01/30/2022] [Accepted: 02/14/2022] [Indexed: 10/19/2022]
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4
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Shimizu S, Shiraki A. CRISPR/Cas9 unveils the dynamics of the endogenous µ-opioid receptors on neuronal cells under continuous opioid stimulation. Pharmacol Res Perspect 2022; 10:e00933. [PMID: 35239244 PMCID: PMC8893010 DOI: 10.1002/prp2.933] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2021] [Accepted: 01/26/2022] [Indexed: 12/12/2022] Open
Abstract
Long‐term opioid use develops tolerance and attenuates analgesic effects. Upon activation, µ‐opioid receptors (MOPs) are internalized and directed to either recycling or degradation pathway. Ligand stimulation also promotes de novo MOP synthesis. These processes collaboratively regulate MOP expression and play critical roles in tolerance development. However, there is limited understanding of how the endogenous MOP expression changes after prolonged opioid administration because previous analyses have focused on individual processes using overexpression systems, which ignored physiological regulation. Another fundamental problem is the unavailability of commercial antibodies to detect the low expression of endogenous MOP in neuronal systems. Here, we established a neuronal cell line to detect endogenous MOP with sufficient sensitivity using CRISPR/Cas9 technology. We incorporated the hemagglutinin sequence into the MOP gene of the SH‐SY5Y cell. The genome‐editing did not significantly impair MOP functions such as MOP internalization or the downstream signaling. The clone was differentiated into a state similar to the primary culture undergoing treatment with all‐trans retinoic acid, followed by brain‐derived neurotrophic factor. Upon continuous stimulation with MOP ligands, endogenous MOP constantly decreased up to 48 h. The expression level was maintained at a certain level following this period, depending on the ligand properties. DAMGO reduced MOP from the cell surface by about 70%, while morphine did so by 40%. Our results indicate that even a few days of opioid administration could significantly reduce the MOP expression level. Our cell line could be a potential tool to investigate the molecular mechanisms underlying the problems caused by long‐term opioid use.
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Affiliation(s)
- Satoshi Shimizu
- Department of AnesthesiaKyoto University HospitalKyoto CityJapan
| | - Atsuko Shiraki
- Graduate School of MedicineDepartment of AnesthesiaKyoto UniversityKyoto CityJapan
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5
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Zhang B, Li S, Shui W. Post-Translational Modifications of G Protein–Coupled Receptors Revealed by Proteomics and Structural Biology. Front Chem 2022; 10:843502. [PMID: 35355784 PMCID: PMC8960047 DOI: 10.3389/fchem.2022.843502] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2021] [Accepted: 02/16/2022] [Indexed: 01/20/2023] Open
Abstract
G protein–coupled receptors (GPCRs) are a protein superfamily comprising >800 members that regulate numerous cellular and physiologic responses. GPCRs represent the largest class of therapeutic targets with implications in various diseases. Although advances in GPCR structural and pharmacological research have significantly improved our knowledge of GPCR signaling mechanisms, mapping diverse post-translational modifications (PTMs) of GPCR proteins and understanding their regulatory roles have received much less attention. Mass spectrometry-based proteomics has become the most popular technology for profiling protein PTMs in a systematic manner. Herein we provide an overview of PTM types, locations, crosstalk and dynamic regulation for different GPCRs that are characterized using proteomic and/or biochemical approaches. Our main focus is on glycosylation, phosphorylation, ubiquitination and palmitoylation that are known to modulate receptor folding, biosynthesis, trafficking, dimerization and signaling. Furthermore, we discuss the locations of specific PTM sites in the structure of a given GPCR and its signaling complex to highlight the importance of PTM regulation in the molecular basis of GPCRs, which may shed new light on structure-based drug discovery.
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Affiliation(s)
- Bingjie Zhang
- iHuman Institute, ShanghaiTech University, Shanghai, China
| | - Shanshan Li
- iHuman Institute, ShanghaiTech University, Shanghai, China
| | - Wenqing Shui
- iHuman Institute, ShanghaiTech University, Shanghai, China
- School of Life Science and Technology, ShanghaiTech University, Shanghai, China
- *Correspondence: Wenqing Shui,
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6
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HA-MOP knockin mice express the canonical µ-opioid receptor but lack detectable splice variants. Commun Biol 2021; 4:1070. [PMID: 34522000 PMCID: PMC8440528 DOI: 10.1038/s42003-021-02580-6] [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: 08/07/2020] [Accepted: 08/17/2021] [Indexed: 12/31/2022] Open
Abstract
G protein-coupled receptors (GPCRs) are notoriously difficult to detect in native tissues. In an effort to resolve this problem, we have developed a novel mouse model by fusing the hemagglutinin (HA)-epitope tag sequence to the amino-terminus of the µ-opioid receptor (MOP). Although HA-MOP knock-in mice exhibit reduced receptor expression, we found that this approach allowed for highly efficient immunodetection of low abundant GPCR targets. We also show that the HA-tag facilitates both high-resolution imaging and immunoisolation of MOP. Mass spectrometry (MS) confirmed post-translational modifications, most notably agonist-selective phosphorylation of carboxyl-terminal serine and threonine residues. MS also unequivocally identified the carboxyl-terminal 387LENLEAETAPLP398 motif, which is part of the canonical MOP sequence. Unexpectedly, MS analysis of brain lysates failed to detect any of the 15 MOP isoforms that have been proposed to arise from alternative splicing of the MOP carboxyl-terminus. For quantitative analysis, we performed multiple successive rounds of immunodepletion using the well-characterized rabbit monoclonal antibody UMB-3 that selectively detects the 387LENLEAETAPLP398 motif. We found that >98% of HA-tagged MOP contain the UMB-3 epitope indicating that virtually all MOP expressed in the mouse brain exhibit the canonical amino acid sequence. Fritzwanker et al. develop a knock-in transgenic mouse line in which the hemagglutinin epitope tag sequence is fused with the amino-terminus of the µ-opioid receptor. Their model enables more efficient immunodetection of G protein-coupled receptors.
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7
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Ujváry I, Christie R, Evans-Brown M, Gallegos A, Jorge R, de Morais J, Sedefov R. DARK Classics in Chemical Neuroscience: Etonitazene and Related Benzimidazoles. ACS Chem Neurosci 2021; 12:1072-1092. [PMID: 33760580 DOI: 10.1021/acschemneuro.1c00037] [Citation(s) in RCA: 46] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Etonitazene and related 2-benzylbenzimidazoles are potent analgetics invented in the research laboratories of the Swiss pharmaceutical giant CIBA in the late 1950s. Though the unprecedented structure distinguishes this class of compounds from poppy-derived and other synthetic analgetics, a range of studies indicate that these drugs are selective μ opioid receptor agonists possessing morphine-like pharmacotoxicological properties in animals as well as humans. Several unscheduled members of this synthetically readily accessible class of opioids that are not controlled under the international and national drug control systems have recently emerged on the illicit drug market. Among them, isotonitazene has been implicated in at least 200 fatalities in Europe and North America. None of the 2-benzylbenzimidazole derivatives have been developed into medicines, but etonitazene and some of its derivatives have been used as receptor probes and in addiction behavior studies in animals. The unique structure has inspired research on such benzimidazoles and related benzimidazolones of which "brorphine" made its debut as one of the newest psychoactive substance to emerge on the illicit opioid drug market in mid-2019. This in-depth review provides a historical introduction, an overview on the chemistry, pharmacological profiles, adverse effects, addiction liability, regulatory status, and the impact on chemical neuroscience of the 2-benzylbenzimidazoles. Structurally related benzimidazoles with opioid and/or analgesic properties are also discussed briefly.
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Affiliation(s)
| | - Rachel Christie
- European Monitoring Centre for Drugs and Drug Addiction, 1249-289 Lisbon, Portugal
| | - Michael Evans-Brown
- European Monitoring Centre for Drugs and Drug Addiction, 1249-289 Lisbon, Portugal
| | - Ana Gallegos
- European Monitoring Centre for Drugs and Drug Addiction, 1249-289 Lisbon, Portugal
| | - Rita Jorge
- European Monitoring Centre for Drugs and Drug Addiction, 1249-289 Lisbon, Portugal
| | - Joanna de Morais
- European Monitoring Centre for Drugs and Drug Addiction, 1249-289 Lisbon, Portugal
| | - Roumen Sedefov
- European Monitoring Centre for Drugs and Drug Addiction, 1249-289 Lisbon, Portugal
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8
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Lemos Duarte M, Trimbake NA, Gupta A, Tumanut C, Fan X, Woods C, Ram A, Gomes I, Bobeck EN, Schechtman D, Devi LA. High-throughput screening and validation of antibodies against synaptic proteins to explore opioid signaling dynamics. Commun Biol 2021; 4:238. [PMID: 33619305 PMCID: PMC7900253 DOI: 10.1038/s42003-021-01744-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2019] [Accepted: 11/13/2020] [Indexed: 12/12/2022] Open
Abstract
Antibodies represent powerful tools to examine signal transduction pathways. Here, we present a strategy integrating multiple state-of-the-art methods to produce, validate, and utilize antibodies. Focusing on understudied synaptic proteins, we generated 137 recombinant antibodies. We used yeast display antibody libraries from the B cells of immunized rabbits, followed by FACS sorting under stringent conditions to identify high affinity antibodies. The antibodies were validated by high-throughput functional screening, and genome editing. Next, we explored the temporal dynamics of signaling in single cells. A subset of antibodies targeting opioid receptors were used to examine the effect of treatment with opiates that have played central roles in the worsening of the 'opioid epidemic.' We show that morphine and fentanyl exhibit differential temporal dynamics of receptor phosphorylation. In summary, high-throughput approaches can lead to the identification of antibody-based tools required for an in-depth understanding of the temporal dynamics of opioid signaling.
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Affiliation(s)
- Mariana Lemos Duarte
- Department of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, Box 1603, New York City, NY, 10029, USA
| | - Nikita A Trimbake
- Department of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, Box 1603, New York City, NY, 10029, USA
- Regeneron Pharmaceutical, 777 Old Saw Mill River Rd, Tarrytown, NY, 10591, USA
| | - Achla Gupta
- Department of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, Box 1603, New York City, NY, 10029, USA
| | | | - Xiaomin Fan
- AvantGen Inc., 6162 Nancy Ridge Dr #150, San Diego, CA, 92121, USA
| | - Catherine Woods
- AvantGen Inc., 6162 Nancy Ridge Dr #150, San Diego, CA, 92121, USA
| | - Akila Ram
- Department of Biology, Utah State University, Logan, UT, 84322, USA
| | - Ivone Gomes
- Department of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, Box 1603, New York City, NY, 10029, USA
| | - Erin N Bobeck
- Department of Biology, Utah State University, Logan, UT, 84322, USA
| | - Deborah Schechtman
- Department of Biochemistry, University of São Paulo, 748 Av Prof Lineu Prestes, room 1208 Cidade Universitaria, São Paulo, SP, 05508000, Brazil
| | - Lakshmi A Devi
- Department of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, Box 1603, New York City, NY, 10029, USA.
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9
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Camacho E, Marie N, Dupas Q, Martel C, Nowoczyn M, Elie N, Rochais C, Töth G, Allouche S. Impact of T161, Y318 and S363 alanine mutations on regulation of the human delta-opioid receptor (hDOPr) induced by peptidic and alkaloid agonists. Neuropharmacology 2020; 179:108286. [PMID: 32841607 DOI: 10.1016/j.neuropharm.2020.108286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 08/07/2020] [Accepted: 08/18/2020] [Indexed: 11/16/2022]
Abstract
Previously, we showed a differential regulation of the human delta-opioid receptor (hDOPr) by etorphine and [D-Pen2, D-Pen5] enkephalin (DPDPE). To understand the molecular basis of such differences, we introduced 3 alanine mutations at the residues T161. Y318 and S363. Both wild type (WT) and hDOPr mutants were expressed in HEK cells containing endogenous arrestins or CFP-tagged arrestin 3, then desensitization, internalization, recycling and phosphorylation were studied. In a context of endogenous arrestin expression, a major difference in DOPr desensitization was observed between agonists that was modified with the T161A mutation upon etorphine and with the S363A substitution upon DPDPE exposure. While both agonists induced a major receptor internalization, T161A and S363A impaired DOPr sequestration only for etorphine. However, similar level of S363 phosphorylation was measured between agonists. When CFP-tagged arrestin 3 was over-expressed, a similar profile of desensitization was measured for both agonists. In this context, all the 3 alanine mutations decreased etorphine-induced receptor desensitization. Using FRET, we showed similar interactions between WT hDOPr and arrestin 3 under DPDPE and etorphine stimulation which were delayed by both the Y318A and the S363A substitutions for etorphine. Finally, hDOPr recycling was qualitatively evaluated by microscopy and showed neither arrestin 3/hDOPr colocalization nor major impact of alanine mutations except for the S363A which impaired internalization and recycling for etorphine. The T161, Y318 and S363 residues of hDOPr could underlie the differential regulation promoted by DPDPE and etorphine.
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Affiliation(s)
- Elise Camacho
- Laboratoire de Signalisation, électrophysiologie et Imagerie des Lésions D'ischémie-reperfusion Myocardique, Normandie Univ, UNICAEN, Caen, France
| | - Nicolas Marie
- Centre National de Recherche Scientifique, Unité Mixte de Recherche 8206, Institut National de La Santé et de La Recherche Médicale. U705, Université Paris Descartes, Laboratoire de Neuropsychopharmacologie des Addictions, 4 Avenue de L'observatoire, 75006, Paris, France
| | - Quentin Dupas
- Laboratoire de Signalisation, électrophysiologie et Imagerie des Lésions D'ischémie-reperfusion Myocardique, Normandie Univ, UNICAEN, Caen, France
| | - Caroline Martel
- Laboratoire de Signalisation, électrophysiologie et Imagerie des Lésions D'ischémie-reperfusion Myocardique, Normandie Univ, UNICAEN, Caen, France
| | - Marie Nowoczyn
- Laboratoire de Signalisation, électrophysiologie et Imagerie des Lésions D'ischémie-reperfusion Myocardique, Normandie Univ, UNICAEN, Caen, France
| | - Nicolas Elie
- Plateau D'Histo-Imagerie Quantitative, CmaBio(3), SF 4206 ICORE, Normandie Univ, Caen, France
| | - Christophe Rochais
- Centre D'Etudes et de Recherche sur le Médicament de Normandie (CERMN), Normandie Univ, UNICAEN, 14000, Caen, France
| | - Geza Töth
- Biological Research Centre, Institute of Biochemistry, Hungarian Academy of Sciences, Szeged, Hungary
| | - Stéphane Allouche
- Laboratoire de Signalisation, électrophysiologie et Imagerie des Lésions D'ischémie-reperfusion Myocardique, Normandie Univ, UNICAEN, Caen, France.
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10
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Lemos Duarte M, Devi LA. Post-translational Modifications of Opioid Receptors. Trends Neurosci 2020; 43:417-432. [PMID: 32459993 PMCID: PMC7323054 DOI: 10.1016/j.tins.2020.03.011] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 03/26/2020] [Accepted: 03/26/2020] [Indexed: 12/13/2022]
Abstract
Post-translational modifications (PTMs) are key events in signal transduction since they affect protein function by regulating their abundance and/or activity. PTMs involve the covalent attachment of functional groups to specific amino acids. Since they tend to be generally reversible, PTMs serve as regulators of signal transduction pathways. G-protein-coupled receptors (GPCRs) are major signaling proteins that undergo multiple types of PTMs. In this Review, we focus on the opioid receptors, members of GPCR family A, and highlight recent advances in the field that have underscored the importance of PTMs in the functional regulation of these receptors. Since opioid receptor activity plays a central role in the development of tolerance and addiction to morphine and other drugs of abuse, understanding the molecular mechanisms regulating receptor activity is of fundamental importance.
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Affiliation(s)
- Mariana Lemos Duarte
- Department of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Lakshmi A Devi
- Department of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
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11
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Birdsong WT, Williams JT. Recent Progress in Opioid Research from an Electrophysiological Perspective. Mol Pharmacol 2020; 98:401-409. [PMID: 32198208 PMCID: PMC7562972 DOI: 10.1124/mol.119.119040] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Accepted: 03/12/2020] [Indexed: 02/06/2023] Open
Abstract
Electrophysiological approaches provide powerful tools to further our understanding of how different opioids affect signaling through opioid receptors; how opioid receptors modulate circuitry involved in processes such as pain, respiration, addiction, and feeding; and how receptor signaling and circuits are altered by physiologic challenges, such as injury, stress, and chronic opioid treatment. The use of genetic manipulations to alter or remove μ-opioid receptors (MORs) with anatomic and cell type specificity and the ability to activate or inhibit specific circuits through opto- or chemogenetic approaches are being used in combination with electrophysiological, pharmacological, and systems-level physiology experiments to expand our understanding of the beneficial and maladaptive roles of opioids and opioid receptor signaling. New approaches for studying endogenous opioid peptide signaling and release and the dynamics of these systems in response to chronic opioid use, pain, and stress will add another layer to our understanding of the intricacies of opioid modulation of brain circuits. This understanding may lead to new targets or approaches for drug development or treatment regimens that may affect both acute and long-term effects of manipulating the activity of circuits involved in opioid-mediated physiology and behaviors. This review will discuss recent advancements in our understanding of the role of phosphorylation in regulating MOR signaling, as well as our understanding of circuits and signaling pathways mediating physiologic behaviors such as respiratory control, and discuss how electrophysiological tools combined with new technologies have and will continue to advance the field of opioid research.
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Affiliation(s)
- William T Birdsong
- Department of Pharmacology, University of Michigan, Ann Arbor, Michigan (W.T.B.) and Vollum Institute, Oregon Health & Science University, Portland, Oregon (J.T.W.)
| | - John T Williams
- Department of Pharmacology, University of Michigan, Ann Arbor, Michigan (W.T.B.) and Vollum Institute, Oregon Health & Science University, Portland, Oregon (J.T.W.)
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12
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Kunselman JM, Zajac AS, Weinberg ZY, Puthenveedu MA. Homologous Regulation of Mu Opioid Receptor Recycling by G βγ , Protein Kinase C, and Receptor Phosphorylation. Mol Pharmacol 2019; 96:702-710. [PMID: 31575621 PMCID: PMC6820217 DOI: 10.1124/mol.119.117267] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Accepted: 09/14/2019] [Indexed: 12/20/2022] Open
Abstract
Membrane trafficking and receptor signaling are two fundamental cellular processes that interact constantly. Although how trafficking regulates signaling is well studied, how signaling pathways regulate trafficking is less well understood. Here, we use the mu opioid receptor (MOR), the primary target for opioid analgesics, to define a signaling pathway that dynamically regulates postendocytic receptor recycling. By directly visualizing individual MOR recycling events, we show that agonist increases MOR recycling. Inhibition of G βγ, phospholipase C, or protein kinase C mimicked agonist removal, whereas activation of G βγ increased recycling even after agonist removal. Phosphorylation of serine 363 on the C-terminal tail of MOR was required and sufficient for agonist-mediated regulation of MOR recycling. Our results identify a feedback loop that regulates MOR recycling via G βγ , protein kinase C, and receptor phosphorylation. This could serve as a general model for how signaling regulates postendocytic trafficking of G protein-coupled receptors. SIGNIFICANCE STATEMENT: G protein-coupled receptor (GPCR) localization in the endosome is being increasingly recognized as an important and distinct component of GPCR signaling and physiology. This study identifies a G protein-dependent and protein kinase C-dependent signaling pathway that dynamically regulates the endosomal localization of the mu opioid receptor, the primary target of opioid analgesics and abused drugs. This pathway could provide a mechanism to manipulate spatial encoding of opioid signaling and physiology.
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Affiliation(s)
- Jennifer M Kunselman
- Cellular and Molecular Biology Program (J.M.K., M.A.P.) and Department of Pharmacology (J.M.K., Z.Y.W., M.A.P.), University of Michigan, Ann Arbor, Michigan; and Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania (A.S.Z., M.A.P.)
| | - Amanda S Zajac
- Cellular and Molecular Biology Program (J.M.K., M.A.P.) and Department of Pharmacology (J.M.K., Z.Y.W., M.A.P.), University of Michigan, Ann Arbor, Michigan; and Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania (A.S.Z., M.A.P.)
| | - Zara Y Weinberg
- Cellular and Molecular Biology Program (J.M.K., M.A.P.) and Department of Pharmacology (J.M.K., Z.Y.W., M.A.P.), University of Michigan, Ann Arbor, Michigan; and Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania (A.S.Z., M.A.P.)
| | - Manojkumar A Puthenveedu
- Cellular and Molecular Biology Program (J.M.K., M.A.P.) and Department of Pharmacology (J.M.K., Z.Y.W., M.A.P.), University of Michigan, Ann Arbor, Michigan; and Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania (A.S.Z., M.A.P.)
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13
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Mann A, Moulédous L, Froment C, O'Neill PR, Dasgupta P, Günther T, Brunori G, Kieffer BL, Toll L, Bruchas MR, Zaveri NT, Schulz S. Agonist-selective NOP receptor phosphorylation correlates in vitro and in vivo and reveals differential post-activation signaling by chemically diverse agonists. Sci Signal 2019; 12:12/574/eaau8072. [PMID: 30914485 DOI: 10.1126/scisignal.aau8072] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Agonists of the nociceptin/orphanin FQ opioid peptide (NOP) receptor, a member of the opioid receptor family, are under active investigation as novel analgesics, but their modes of signaling are less well characterized than those of other members of the opioid receptor family. Therefore, we investigated whether different NOP receptor ligands showed differential signaling or functional selectivity at the NOP receptor. Using newly developed phosphosite-specific antibodies to the NOP receptor, we found that agonist-induced NOP receptor phosphorylation occurred primarily at four carboxyl-terminal serine (Ser) and threonine (Thr) residues, namely, Ser346, Ser351, Thr362, and Ser363, and proceeded with a temporal hierarchy, with Ser346 as the first site of phosphorylation. G protein-coupled receptor kinases 2 and 3 (GRK2/3) cooperated during agonist-induced phosphorylation, which, in turn, facilitated NOP receptor desensitization and internalization. A comparison of structurally distinct NOP receptor agonists revealed dissociation in functional efficacies between G protein-dependent signaling and receptor phosphorylation. Furthermore, in NOP-eGFP and NOP-eYFP mice, NOP receptor agonists induced multisite phosphorylation and internalization in a dose-dependent and agonist-selective manner that could be blocked by specific antagonists. Our study provides new tools to study ligand-activated NOP receptor signaling in vitro and in vivo. Differential agonist-selective NOP receptor phosphorylation by chemically diverse NOP receptor agonists suggests that differential signaling by NOP receptor agonists may play a role in NOP receptor ligand pharmacology.
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Affiliation(s)
- Anika Mann
- Institute of Pharmacology and Toxicology, Jena University Hospital, Friedrich Schiller University Jena, Drackendorfer Str. 1, Jena 07747, Germany.
| | - Lionel Moulédous
- Research Center on Animal Cognition, Center for Integrative Biology, Toulouse University, CNRS, UPS, 31062 Toulouse Cedex 09, France
| | - Carine Froment
- Institut de Pharmacologie et de Biologie Structurale, Université de Toulouse, CNRS, UPS, 31077 Toulouse Cedex 04, France
| | - Patrick R O'Neill
- Department of Anesthesiology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Pooja Dasgupta
- Institute of Pharmacology and Toxicology, Jena University Hospital, Friedrich Schiller University Jena, Drackendorfer Str. 1, Jena 07747, Germany
| | - Thomas Günther
- Institute of Pharmacology and Toxicology, Jena University Hospital, Friedrich Schiller University Jena, Drackendorfer Str. 1, Jena 07747, Germany
| | - Gloria Brunori
- Biomedical Science Department, Charles E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL 33431, USA
| | - Brigitte L Kieffer
- Douglas Research Center, Department of Psychiatry, Faculty of Medicine, McGill University, Montreal, QC H3A 1A1, Canada
| | - Lawrence Toll
- Biomedical Science Department, Charles E. Schmidt College of Medicine, Florida Atlantic University, Boca Raton, FL 33431, USA
| | - Michael R Bruchas
- Center for the Neurobiology of Addiction, Pain, and Emotion, Departments of Anesthesiology and Pharmacology, University of Washington, Seattle, WA 98195, USA
| | | | - Stefan Schulz
- Institute of Pharmacology and Toxicology, Jena University Hospital, Friedrich Schiller University Jena, Drackendorfer Str. 1, Jena 07747, Germany.
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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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Priestley R, Glass M, Kendall D. Functional Selectivity at Cannabinoid Receptors. CANNABINOID PHARMACOLOGY 2017; 80:207-221. [DOI: 10.1016/bs.apha.2017.03.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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16
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Alfonzo-Méndez MA, Alcántara-Hernández R, García-Sáinz JA. Novel Structural Approaches to Study GPCR Regulation. Int J Mol Sci 2016; 18:E27. [PMID: 28025563 PMCID: PMC5297662 DOI: 10.3390/ijms18010027] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Revised: 12/15/2016] [Accepted: 12/21/2016] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND Upon natural agonist or pharmacological stimulation, G protein-coupled receptors (GPCRs) are subjected to posttranslational modifications, such as phosphorylation and ubiquitination. These posttranslational modifications allow protein-protein interactions that turn off and/or switch receptor signaling as well as trigger receptor internalization, recycling or degradation, among other responses. Characterization of these processes is essential to unravel the function and regulation of GPCR. METHODS In silico analysis and methods such as mass spectrometry have emerged as novel powerful tools. Both approaches have allowed proteomic studies to detect not only GPCR posttranslational modifications and receptor association with other signaling macromolecules but also to assess receptor conformational dynamics after ligand (agonist/antagonist) association. RESULTS this review aims to provide insights into some of these methodologies and to highlight how their use is enhancing our comprehension of GPCR function. We present an overview using data from different laboratories (including our own), particularly focusing on free fatty acid receptor 4 (FFA4) (previously known as GPR120) and α1A- and α1D-adrenergic receptors. From our perspective, these studies contribute to the understanding of GPCR regulation and will help to design better therapeutic agents.
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Affiliation(s)
- Marco A Alfonzo-Méndez
- Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Ciudad Universitaria, Ciudad de México 04510, Mexico.
| | - Rocío Alcántara-Hernández
- Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Ciudad Universitaria, Ciudad de México 04510, Mexico.
| | - J Adolfo García-Sáinz
- Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Ciudad Universitaria, Ciudad de México 04510, Mexico.
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