1
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Pradier B, Segelcke D, Reichl S, Zahn PK, Pogatzki-Zahn EM. Spinal GABA transporter 1 contributes to evoked-pain related behavior but not resting pain after incision injury. Front Mol Neurosci 2023; 16:1282151. [PMID: 38130683 PMCID: PMC10734427 DOI: 10.3389/fnmol.2023.1282151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Accepted: 10/30/2023] [Indexed: 12/23/2023] Open
Abstract
The inhibitory function of GABA at the spinal level and its central modulation in the brain are essential for pain perception. However, in post-surgical pain, the exact mechanism and modes of action of GABAergic transmission have been poorly studied. This work aimed to investigate GABA synthesis and uptake in the incisional pain model in a time-dependent manner. Here, we combined assays for mechanical and heat stimuli-induced withdrawal reflexes with video-based assessments and assays for non-evoked (NEP, guarding of affected hind paw) and movement-evoked (MEP, gait pattern) pain-related behaviors in a plantar incision model in male rats to phenotype the effects of the inhibition of the GABA transporter (GAT-1), using a specific antagonist (NO711). Further, we determined the expression profile of spinal dorsal horn GAT-1 and glutamate decarboxylase 65/67 (GAD65/67) by protein expression analyses at four time points post-incision. Four hours after incision, we detected an evoked pain phenotype (mechanical, heat and movement), which transiently ameliorated dose-dependently following spinal inhibition of GAT-1. However, the NEP-phenotype was not affected. Four hours after incision, GAT-1 expression was significantly increased, whereas GAD67 expression was significantly reduced. Our data suggest that GAT-1 plays a role in balancing spinal GABAergic signaling in the spinal dorsal horn shortly after incision, resulting in the evoked pain phenotype. Increased GAT-1 expression leads to increased GABA uptake from the synaptic cleft and reduces tonic GABAergic inhibition at the post-synapse. Inhibition of GAT-1 transiently reversed this imbalance and ameliorated the evoked pain phenotype.
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Affiliation(s)
- Bruno Pradier
- Department of Anesthesiology, Operative Intensive Care and Pain Medicine, University Hospital Muenster, Muenster, Germany
| | - Daniel Segelcke
- Department of Anesthesiology, Operative Intensive Care and Pain Medicine, University Hospital Muenster, Muenster, Germany
| | - Sylvia Reichl
- Department of Anesthesiology, Operative Intensive Care and Pain Medicine, University Hospital Muenster, Muenster, Germany
| | - P. K. Zahn
- Department of Anesthesiology, Intensive Care and Pain Medicine, BG University Hospital Bergmannsheil, Ruhr-Universität Bochum, Bochum, Germany
| | - E. M. Pogatzki-Zahn
- Department of Anesthesiology, Operative Intensive Care and Pain Medicine, University Hospital Muenster, Muenster, Germany
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2
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Chen HF, Lambers H, Nagelmann N, Sandbrink M, Segelcke D, Pogatzki-Zahn E, Faber C, Pradier B. Generation of a whole-brain hemodynamic response function and sex-specific differences in cerebral processing of mechano-sensation in mice detected by BOLD fMRI. Front Neurosci 2023; 17:1187328. [PMID: 37700753 PMCID: PMC10493293 DOI: 10.3389/fnins.2023.1187328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Accepted: 07/05/2023] [Indexed: 09/14/2023] Open
Abstract
BOLD fMRI has become a prevalent method to study cerebral sensory processing in rodent disease models, including pain and mechanical hypersensitivity. fMRI data analysis is frequently combined with a general-linear-model (GLM) -based analysis, which uses the convolution of a hemodynamic response function (HRF) with the stimulus paradigm. However, several studies indicated that the HRF differs across species, sexes, brain structures, and experimental factors, including stimulation modalities or anesthesia, and hence might strongly affect the outcome of BOLD analyzes. While considerable work has been done in humans and rats to understand the HRF, much less is known in mice. As a prerequisite to investigate mechano-sensory processing and BOLD fMRI data in male and female mice, we (1) designed a rotating stimulator that allows application of two different mechanical modalities, including innocuous von Frey and noxious pinprick stimuli and (2) determined and statistically compared HRFs across 30 brain structures and experimental conditions, including sex and, stimulus modalities. We found that mechanical stimulation lead to brain-wide BOLD signal changes thereby allowing extraction of HRFs from multiple brain structures. However, we did not find differences in HRFs across all brain structures and experimental conditions. Hence, we computed a whole-brain mouse HRF, which is based on 88 functional scans from 30 mice. A comparison of this mouse-specific HRF with our previously reported rat-derived HRF showed significantly slower kinetics in mice. Finally, we detected pronounced differences in cerebral BOLD activation between male and female mice with mechanical stimulation, thereby exposing divergent processing of noxious and innocuous stimuli in both sexes.
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Affiliation(s)
- Hui-Fen Chen
- Clinic of Radiology, Translational Research Imaging Center (TRIC), University of Münster, Münster, Germany
| | - Henriette Lambers
- Clinic of Radiology, Translational Research Imaging Center (TRIC), University of Münster, Münster, Germany
| | - Nina Nagelmann
- Clinic of Radiology, Translational Research Imaging Center (TRIC), University of Münster, Münster, Germany
| | - Martin Sandbrink
- Clinic of Radiology, Translational Research Imaging Center (TRIC), University of Münster, Münster, Germany
| | - Daniel Segelcke
- Department of Anesthesiology, Intensive Care and Pain Medicine, University of Münster, Münster, Germany
| | - Esther Pogatzki-Zahn
- Department of Anesthesiology, Intensive Care and Pain Medicine, University of Münster, Münster, Germany
| | - Cornelius Faber
- Clinic of Radiology, Translational Research Imaging Center (TRIC), University of Münster, Münster, Germany
| | - Bruno Pradier
- Clinic of Radiology, Translational Research Imaging Center (TRIC), University of Münster, Münster, Germany
- Department of Anesthesiology, Intensive Care and Pain Medicine, University of Münster, Münster, Germany
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3
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Segelcke D, van der Burgt M, Kappert C, Schmidt Garcia D, Sondermann JR, Bigalke S, Pradier B, Gomez-Varela D, Zahn PK, Schmidt M, Pogatzki-Zahn EM. Phenotype- and species-specific skin proteomic signatures for incision-induced pain in humans and mice. Br J Anaesth 2023; 130:331-342. [PMID: 36609060 DOI: 10.1016/j.bja.2022.10.040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 10/24/2022] [Accepted: 10/24/2022] [Indexed: 01/06/2023] Open
Abstract
BACKGROUND Acute pain after surgery is common and often leads to chronic post-surgical pain, but neither treatment nor prevention is currently sufficient. We hypothesised that specific protein networks (protein-protein interactions) are relevant for pain after surgery in humans and mice. METHODS Standardised surgical incisions were performed in male human volunteers and male mice. Quantitative and qualitative sensory phenotyping were combined with unbiased quantitative mass spectrometry-based proteomics and protein network theory. The primary outcomes were skin protein signature changes in humans and phenotype-specific protein-protein interaction analysis 24 h after incision. Secondary outcomes were interspecies comparison of protein regulation as well as protein-protein interactions after incision and validation of selected proteins in human skin by immunofluorescence. RESULTS Skin biopsies in 21 human volunteers revealed 119/1569 regulated proteins 24 h after incision. Protein-protein interaction analysis delineated remarkable differences between subjects with small (low responders, n=12) and large incision-related hyperalgesic areas (high responders, n=7), a phenotype most predictive of developing chronic post-surgical pain. Whereas low responders predominantly showed an anti-inflammatory protein signature, high responders exhibited signatures associated with a distinct proteolytic environment and persistent inflammation. Compared to humans, skin biopsies in mice habored even more regulated proteins (435/1871) 24 h after incision with limited overlap between species as assessed by proteome dynamics and PPI. Immunohistochemistry confirmed the expression of high priority candidates in human skin biopsies. CONCLUSIONS Proteome profiling of human skin after incision revealed protein-protein interactions correlated with pain and hyperalgesia, which may be of potential significance for preventing chronic post-surgical pain. Importantly, protein-protein interactions were differentially modulated in mice compared to humans opening new avenues for successful translational research.
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Affiliation(s)
- Daniel Segelcke
- Department of Anaesthesiology, Intensive Care and Pain Medicine, University Hospital Muenster, Muenster, Germany
| | - Max van der Burgt
- Department of Anaesthesiology, Intensive Care and Pain Medicine, University Hospital Muenster, Muenster, Germany
| | - Christin Kappert
- Max Planck Institute for Multidisciplinary Sciences, City Campus, Goettingen, Germany
| | | | - Julia R Sondermann
- Division of Pharmacology and Toxicology, Department of Pharmaceutical Sciences, University of Vienna, Vienna, Austria
| | - Stephan Bigalke
- Department of Anaesthesiology, Intensive Care and Pain Medicine, University Hospital Muenster, Muenster, Germany; Clinic for Anaesthesiology, Intensive and Pain Medicine, Ruhr-University Bochum, BG-University Hospital Bergmannsheil gGmbH, Bochum, Germany
| | - Bruno Pradier
- Department of Anaesthesiology, Intensive Care and Pain Medicine, University Hospital Muenster, Muenster, Germany
| | - David Gomez-Varela
- Division of Pharmacology and Toxicology, Department of Pharmaceutical Sciences, University of Vienna, Vienna, Austria
| | - Peter K Zahn
- Clinic for Anaesthesiology, Intensive and Pain Medicine, Ruhr-University Bochum, BG-University Hospital Bergmannsheil gGmbH, Bochum, Germany
| | - Manuela Schmidt
- Division of Pharmacology and Toxicology, Department of Pharmaceutical Sciences, University of Vienna, Vienna, Austria.
| | - Esther M Pogatzki-Zahn
- Department of Anaesthesiology, Intensive Care and Pain Medicine, University Hospital Muenster, Muenster, Germany.
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4
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Lambers H, Wachsmuth L, Thomas D, Boumezbeur F, Hoesker V, Pradier B, Faber C. Fiber-based lactate recordings with fluorescence resonance energy transfer sensors by applying an magnetic resonance-informed correction of hemodynamic artifacts. Neurophotonics 2022; 9:032212. [PMID: 35558647 PMCID: PMC9084224 DOI: 10.1117/1.nph.9.3.032212] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Accepted: 04/06/2022] [Indexed: 06/15/2023]
Abstract
Significance: Fluorescence resonance energy transfer (FRET) sensors offer enormous benefits when studying neurophysiology through confocal microscopy. Yet, their use for fiber-based in vivo recordings is hampered by massive confounding effects and has therefore been scarcely reported. Aim: We aim to investigate whether in vivo fiber-based lactate recordings in the rodent brain are feasible with FRET sensors and implement a correction algorithm for the predominant hemodynamic artifact. Approach: We performed fiber-based FRET recordings of lactate (Laconic) and calcium (Twitch-2B) simultaneously with functional MRI and pharmacological MRI. MR-derived parameters were applied to correct hemodynamic artifacts. Results of FRET measurements were validated by local field potential, magnetic resonance spectroscopy, and blood analysis. Results: Hemodynamic artifacts dominated fiber-based in vivo FRET measurements with both Laconic and Twitch-2B. Our MR-based correction algorithm enabled to remove the artifacts and detect lactate and calcium changes during sensory stimulation or intravenous lactate injections. Conclusions: In vivo fiber-based lactate recordings are feasible using FRET-based sensors. However, signal corrections are required. MR-derived hemodynamic parameters can successfully be applied for artifact correction.
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Affiliation(s)
- Henriette Lambers
- University Hospital Münster, Translational Research Imaging Center (TRIC), Clinic for Radiology, Münster, Germany
| | - Lydia Wachsmuth
- University Hospital Münster, Translational Research Imaging Center (TRIC), Clinic for Radiology, Münster, Germany
| | - Dominik Thomas
- University Hospital Münster, Translational Research Imaging Center (TRIC), Clinic for Radiology, Münster, Germany
| | - Fawzi Boumezbeur
- NeuroSpin, CEA, CNRS, Paris-Saclay University, Gif-Sur-Yvette, France
| | - Vanessa Hoesker
- University Hospital Münster, Translational Research Imaging Center (TRIC), Clinic for Radiology, Münster, Germany
| | - Bruno Pradier
- University Hospital Münster, Translational Research Imaging Center (TRIC), Clinic for Radiology, Münster, Germany
| | - Cornelius Faber
- University Hospital Münster, Translational Research Imaging Center (TRIC), Clinic for Radiology, Münster, Germany
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5
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Tappe-Theodor A, Pitzer C, Lewejohann L, Jirkof P, Siegeler K, Segelcke A, Drude N, Pradier B, Pogatzki-Zahn E, Hollinderbäumer B, Segelcke D. The “WWHow” Concept for Prospective Categorization of Post-operative Severity Assessment in Mice and Rats. Front Vet Sci 2022; 9:841431. [PMID: 35372532 PMCID: PMC8964947 DOI: 10.3389/fvets.2022.841431] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 02/09/2022] [Indexed: 11/13/2022] Open
Abstract
The prospective severity assessment in animal experiments in the categories' non-recovery, mild, moderate, and severe is part of each approval process and serves to estimate the harm/benefit. Harms are essential for evaluating ethical justifiability, and on the other hand, they may represent confounders and effect modifiers within an experiment. Catalogs and guidelines provide a way to assess the experimental severity prospectively but are limited in adaptation due to their nature of representing particular examples without clear explanations of the assessment strategies. To provide more flexibility for current and future practices, we developed the modular Where-What-How (WWHow) concept, which applies findings from pre-clinical studies using surgical-induced pain models in mice and rats to provide a prospective severity assessment. The WWHow concept integrates intra-operative characteristics for predicting the maximum expected severity of surgical procedures. The assessed severity categorization is mainly congruent with examples in established catalogs; however, because the WWHow concept is based on anatomical location, detailed analysis of the tissue trauma and other intra-operative characteristics, it enables refinement actions, provides the basis for a fact-based dialogue with authority officials and other stakeholders, and helps to identify confounder factors of study findings.
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Affiliation(s)
- Anke Tappe-Theodor
- Institute of Pharmacology, University of Heidelberg, Heidelberg, Germany
| | - Claudia Pitzer
- Interdisciplinary Neurobehavioral Core, University of Heidelberg, Heidelberg, Germany
| | - Lars Lewejohann
- Institute of Animal Welfare, Animal Behavior and Laboratory Animal Science, Freie Universität Berlin, Berlin, Germany
- German Federal Institute for Risk Assessment (BfR), German Center for the Protection of Laboratory Animals (Bf3R), Berlin, Germany
| | - Paulin Jirkof
- Office for Animal Welfare and 3Rs, University of Zurich, Zurich, Switzerland
| | - Katja Siegeler
- Department of Work and Environmental Protection, Westphalian Wilhelms University Muenster, Münster, Germany
| | | | - Natascha Drude
- Berlin Institute of Health (BIH) at Charité, QUEST Center for Responsible Research, Berlin, Germany
| | - Bruno Pradier
- Department of Anesthesiology, Intensive Care and Pain Medicine, University Hospital Muenster, Münster, Germany
| | - Esther Pogatzki-Zahn
- Department of Anesthesiology, Intensive Care and Pain Medicine, University Hospital Muenster, Münster, Germany
| | | | - Daniel Segelcke
- Department of Anesthesiology, Intensive Care and Pain Medicine, University Hospital Muenster, Münster, Germany
- *Correspondence: Daniel Segelcke
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6
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Pradier B, Wachsmuth L, Nagelmann N, Segelcke D, Kreitz S, Hess A, Pogatzki-Zahn EM, Faber C. Combined resting state-fMRI and calcium recordings show stable brain states for task-induced fMRI in mice under combined ISO/MED anesthesia. Neuroimage 2021; 245:118626. [PMID: 34637903 DOI: 10.1016/j.neuroimage.2021.118626] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Accepted: 09/27/2021] [Indexed: 11/28/2022] Open
Abstract
For fMRI in animal models, the combination of low-dose anesthetic, isoflurane (ISO), and the sedative medetomidine (MED) has recently become an advocated regimen to achieve stable neuronal states and brain networks in rats that are required for reliable task-induced BOLD fMRI. However, in mice the temporal stability of neuronal states and networks in resting-state (rs)-fMRI experiments during the combined ISO/MED regimen has not been systematically investigated. Using a multimodal approach with optical calcium (Ca2+) recordings and rs-fMRI, we investigated cortical neuronal/astrocytic Ca2+activity states and brain networks at multiple time points while switching from anesthesia with 1% ISO to a combined ISO/MED regimen. We found that cortical activity states reached a steady-state 45 min following start of MED infusion as indicated by stable Ca2+ transients. Similarly, rs-networks were not statistically different between anesthesia with ISO and the combined ISO/MED regimen 45 and 100 min after start of MED. Importantly, during the transition time we identified changed rs-network signatures that likely reflect the different mode of action of the respective anesthetic; these included a dose-dependent increase in cortico-cortical functional connectivity (FC) presumably caused by reduction of ISO concentration and decreased FC in subcortical arousal nuclei due to MED infusion. Furthermore, we report detection of visual stimulation-induced BOLD fMRI during the stable ISO/MED neuronal state 45 min after induction. Based on our findings, we recommend a 45-minute waiting period after switching from ISO anesthesia to the combined ISO/MED regimen before performing rs- or task-induced fMRI experiments.
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Affiliation(s)
- Bruno Pradier
- Department of Clinical Radiology, Translational Research Imaging Center, University Hospital Münster, Münster 48149, Germany; Department of Anesthesiology Intensive Care and Pain Medicine, University Hospital Münster, Germany
| | - Lydia Wachsmuth
- Department of Clinical Radiology, Translational Research Imaging Center, University Hospital Münster, Münster 48149, Germany
| | - Nina Nagelmann
- Department of Clinical Radiology, Translational Research Imaging Center, University Hospital Münster, Münster 48149, Germany
| | - Daniel Segelcke
- Department of Anesthesiology Intensive Care and Pain Medicine, University Hospital Münster, Germany
| | - Silke Kreitz
- Institute of Experimental and Clinical Pharmacology and Toxicology, Emil Fischer Center, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Andreas Hess
- Institute of Experimental and Clinical Pharmacology and Toxicology, Emil Fischer Center, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Esther M Pogatzki-Zahn
- Department of Anesthesiology Intensive Care and Pain Medicine, University Hospital Münster, Germany
| | - Cornelius Faber
- Department of Clinical Radiology, Translational Research Imaging Center, University Hospital Münster, Münster 48149, Germany.
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7
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Segelcke D, Pradier B, Reichl S, Schäfer LC, Pogatzki-Zahn EM. Investigating the Role of Ly6G+ Neutrophils in Incisional and Inflammatory Pain by Multidimensional Pain-Related Behavioral Assessments: Bridging the Translational Gap. Front Pain Res 2021; 2:735838. [PMID: 35295496 PMCID: PMC8915677 DOI: 10.3389/fpain.2021.735838] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2021] [Accepted: 08/09/2021] [Indexed: 12/27/2022] Open
Abstract
In recent years, preclinical pain research has failed to develop genuinely new analgesics for clinical use. This fact is reflected by a high number of patients, limited drug efficacy accompanied by side effects, and a long-term opioid intake. Two main aspects have been addressed, which hinder translation: the use of non-relevant pain models and a mismatch between pain-related outcomes in preclinical and clinical studies. Conversely, disease-specific pain models that mirror more closely the clinical situation and multidimensional behavioral outcome measures that objectively and reproducibly assess relevant pain-related symptoms in a preclinical setting could improve translation. Mechanistically, a matter of debate is the role of Ly6G+ neutrophil granulocytes (NGs) for pain. NGs are essential to eliminate pathogens and promote the wound healing process. For this purpose, there is a need to release various pro- and anti-inflammatory mediators, some of which could ameliorate or enhance pain. However, the contribution of NGs to different pain entities is contradictory for reflex-based tests, and completely unknown in the context of non-evoked pain (NEP) and movement-evoked pain (MEP). First, we combined withdrawal reflex-based assays with novel video-based assessments for NEP- and MEP-related behavior in two mouse pain models. The pain models utilized in this study were incision (INC) and pathogen/adjuvant-induced inflammation (CFA), translating well to postsurgical and inflammatory pain entities. Second, we depleted NGs and applied a set of behavioral assessments to investigate the role of NG migration in different pain modalities. Our comprehensive behavioral approach identified pain-related behaviors in mice that resemble (NEP) or differentiate (MEP) behavioral trajectories in comparison to mechanical and heat hypersensitivity, thereby indicating modality-dependent mechanisms. Further, we show that injury-induced accumulation of NGs minimally affects pain-related behaviors in both pain models. In conclusion, we report a novel assessment to detect NEP in mice after unilateral injuries using a more unbiased approach. Additionally, we are capable of detecting an antalgic gait for both pain entities with unique trajectories. The different trajectories between MEP and other pain modalities suggest that the underlying mechanisms differ. We further conclude that NGs play a subordinate role in pain-related behaviors in incisional and inflammatory pain.
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Affiliation(s)
- Daniel Segelcke
- Department for Anesthesiology, Operative Intensive Care and Pain Medicine, University Hospital Muenster, Albert-Schweitzer-Campus 1, Muenster, Germany
| | - Bruno Pradier
- Department for Anesthesiology, Operative Intensive Care and Pain Medicine, University Hospital Muenster, Albert-Schweitzer-Campus 1, Muenster, Germany
| | - Sylvia Reichl
- Department for Anesthesiology, Operative Intensive Care and Pain Medicine, University Hospital Muenster, Albert-Schweitzer-Campus 1, Muenster, Germany
- Department of Anesthesiology, Perioperative Medicine, Paracelsus Medical University, Salzburg, Austria
| | - Lukas C. Schäfer
- Department for Anesthesiology, Operative Intensive Care and Pain Medicine, University Hospital Muenster, Albert-Schweitzer-Campus 1, Muenster, Germany
| | - Esther M. Pogatzki-Zahn
- Department for Anesthesiology, Operative Intensive Care and Pain Medicine, University Hospital Muenster, Albert-Schweitzer-Campus 1, Muenster, Germany
- *Correspondence: Esther M. Pogatzki-Zahn
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8
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Wachsmuth L, Mensen A, Barca C, Wiart M, Tristão-Pereira C, Busato A, Waiczies S, Himmelreich U, Millward JM, Reimann HM, Jelescu I, Marzola P, Pradier B, Viola A, Faber C. Contribution of preclinical MRI to responsible animal research: living up to the 3R principle. MAGMA 2021; 34:469-474. [PMID: 34009521 PMCID: PMC8338837 DOI: 10.1007/s10334-021-00929-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 05/07/2021] [Accepted: 05/08/2021] [Indexed: 11/25/2022]
Affiliation(s)
- Lydia Wachsmuth
- Translational Research Imaging Center, Clinic for Radiology, University Hospital Münster, Albert-Schweitzer Campus 1, 48163, Muenster, Germany
| | - Armand Mensen
- Swiss 3R Competence Centre, University of Bern, Hochschulstrasse 6, 3012, Bern, Switzerland
| | - Cristina Barca
- European Institute for Molecular Imaging (EIMI), University of Münster, Waldeyerstraße 15, 48149, Munster, Germany
| | - Marlene Wiart
- Univ-Lyon, CarMeN laboratory, Inserm U1060, INRA U1397, Université Claude Bernard Lyon 1, INSA Lyon, Charles Mérieux Medical School, 69600, Oullins, France
| | - Catarina Tristão-Pereira
- Animal Imaging and Technology, EPFL, Station 6, 1015, Lausanne, Switzerland
- CIBM Center for Biomedical Imaging, EPFL, Station 6, 1015, Lausanne, Switzerland
- Centro Nacional de Investigaciones Cardiovasculares, Calle de Melchor Fernández Almagro, 3, 280291, Madrid, Spain
| | - Alice Busato
- Department of Computer Science, Strada Le Grazie 15, 37134, Verona, Italy
| | - Sonia Waiczies
- Berlin Ultrahigh Field Facility (B.U.F.F.), Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Robert-Roessle-Straße 10, 13125, Berlin, Germany
| | - Uwe Himmelreich
- Biomedical MRI, Department Imaging and Pathology, KU Leuven, Herestraat 49, bus 505, 3000, Leuven, Belgium
| | - Jason M Millward
- Berlin Ultrahigh Field Facility (B.U.F.F.), Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Robert-Roessle-Straße 10, 13125, Berlin, Germany
| | - Henning M Reimann
- Berlin Ultrahigh Field Facility (B.U.F.F.), Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Robert-Roessle-Straße 10, 13125, Berlin, Germany
| | - Ileana Jelescu
- Animal Imaging and Technology, EPFL, Station 6, 1015, Lausanne, Switzerland
| | - Pasquina Marzola
- Department of Computer Science, Strada Le Grazie 15, 37134, Verona, Italy
| | - Bruno Pradier
- Translational Research Imaging Center, Clinic for Radiology, University Hospital Münster, Albert-Schweitzer Campus 1, 48163, Muenster, Germany
| | - Angèle Viola
- Aix-Marseille Univ, CNRS, CRMBM UMR 7339, Faculté des Sciences Médicales et Paramédicales la Timone, 13005, Marseille, France
| | - Cornelius Faber
- Translational Research Imaging Center, Clinic for Radiology, University Hospital Münster, Albert-Schweitzer Campus 1, 48163, Muenster, Germany.
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9
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Soliman N, Haroutounian S, Hohmann AG, Krane E, Liao J, Macleod M, Segelcke D, Sena C, Thomas J, Vollert J, Wever K, Alaverdyan H, Barakat A, Barthlow T, Bozer ALH, Davidson A, Diaz-delCastillo M, Dolgorukova A, Ferdousi MI, Healy C, Hong S, Hopkins M, James A, Leake HB, Malewicz NM, Mansfield M, Mardon AK, Mattimoe D, McLoone DP, Noes-Holt G, Pogatzki-Zahn EM, Power E, Pradier B, Romanos-Sirakis E, Segelcke A, Vinagre R, Yanes JA, Zhang J, Zhang XY, Finn DP, Rice AS. Systematic review and meta-analysis of cannabinoids, cannabis-based medicines, and endocannabinoid system modulators tested for antinociceptive effects in animal models of injury-related or pathological persistent pain. Pain 2021; 162:S26-S44. [PMID: 33729209 PMCID: PMC8216112 DOI: 10.1097/j.pain.0000000000002269] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 03/12/2021] [Accepted: 03/12/2021] [Indexed: 12/11/2022]
Abstract
ABSTRACT We report a systematic review and meta-analysis of studies that assessed the antinociceptive efficacy of cannabinoids, cannabis-based medicines, and endocannabinoid system modulators on pain-associated behavioural outcomes in animal models of pathological or injury-related persistent pain. In April 2019, we systematically searched 3 online databases and used crowd science and machine learning to identify studies for inclusion. We calculated a standardised mean difference effect size for each comparison and performed a random-effects meta-analysis. We assessed the impact of study design characteristics and reporting of mitigations to reduce the risk of bias. We meta-analysed 374 studies in which 171 interventions were assessed for antinociceptive efficacy in rodent models of pathological or injury-related pain. Most experiments were conducted in male animals (86%). Antinociceptive efficacy was most frequently measured by attenuation of hypersensitivity to evoked limb withdrawal. Selective cannabinoid type 1, cannabinoid type 2, nonselective cannabinoid receptor agonists (including delta-9-tetrahydrocannabinol) and peroxisome proliferator-activated receptor-alpha agonists (predominantly palmitoylethanolamide) significantly attenuated pain-associated behaviours in a broad range of inflammatory and neuropathic pain models. Fatty acid amide hydrolase inhibitors, monoacylglycerol lipase inhibitors, and cannabidiol significantly attenuated pain-associated behaviours in neuropathic pain models but yielded mixed results in inflammatory pain models. The reporting of criteria to reduce the risk of bias was low; therefore, the studies have an unclear risk of bias. The value of future studies could be enhanced by improving the reporting of methodological criteria, the clinical relevance of the models, and behavioural assessments. Notwithstanding, the evidence supports the hypothesis of cannabinoid-induced analgesia.
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Affiliation(s)
- Nadia Soliman
- Pain Research, Department of Surgery and Cancer, Imperial College London, London, United Kingdom
| | - Simon Haroutounian
- Department of Anesthesiology, Washington University Pain Center, Washington University School of Medicine, St. Louis, Missouri, United States
| | - Andrea G. Hohmann
- Department of Psychological and Brain Sciences, Program in Neuroscience and Gill Center for Biomolecular Science, Bloomington, IN, United States
| | - Elliot Krane
- Departments of Anesthesiology, Perioperative, and Pain Medicine, & Pediatrics, Stanford University School of Medicine, Stanford, CA, United States
| | - Jing Liao
- CAMARADES, Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, United Kingdom
| | - Malcolm Macleod
- CAMARADES, Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, United Kingdom
| | - Daniel Segelcke
- Department of Anesthesiology, Intensive Care and Pain Medicine University Hospital Muenster, Muenster, Germany
| | - Christopher Sena
- CAMARADES, Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, United Kingdom
| | - James Thomas
- EPPI-Centre, University College London, London, United Kingdom
| | - Jan Vollert
- Pain Research, Department of Surgery and Cancer, Imperial College London, London, United Kingdom
| | - Kimberley Wever
- SYRCLE at Central Animal Laboratory, Radbound University Medical Center, Nijmegen, the Netherlands
| | - Harutyun Alaverdyan
- Department of Anesthesiology, Washington University Pain Center, Washington University School of Medicine, St. Louis, Missouri, United States
| | - Ahmed Barakat
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Assiut University, Asyut, Egypt
| | - Tyler Barthlow
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Amber L. Harris Bozer
- Department of Psychological Sciences, Tarleton State University, Stephenville, TX, United States
| | | | - Marta Diaz-delCastillo
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Antonina Dolgorukova
- Valdman Institute of Pharmacology, Pavlov First Saint Petersburg State Medical University, Saint Petersburg, Russia
| | - Mehnaz I. Ferdousi
- Pharmacology and Therapeutics, School of Medicine, Galway Neuroscience Centre and Centre for Pain Research, Human Biology Building, National University of Ireland Galway, Galway, Ireland
| | - Catherine Healy
- Pharmacology and Therapeutics, School of Medicine, Galway Neuroscience Centre and Centre for Pain Research, Human Biology Building, National University of Ireland Galway, Galway, Ireland
| | - Simon Hong
- Department of Psychological and Brain Sciences, Indiana University, Bloomington, IN, United States
| | - Mary Hopkins
- Pharmacology and Therapeutics, School of Medicine, Galway Neuroscience Centre and Centre for Pain Research, Human Biology Building, National University of Ireland Galway, Galway, Ireland
| | - Arul James
- Leicester General Hospital, University Hospitals of Leicester NHS Trust, Leicester, United Kingdom
| | - Hayley B. Leake
- IIMPACT in Health, University of South Australia, Adelaide, South Australia, Australia
- Centre for Pain IMPACT, Neuroscience Research Australia, Sydney, New South Wales, Australia
| | - Nathalie M. Malewicz
- Department of Anaesthesiology, Intensive Care Medicine and Pain Management, Medical Faculty of Ruhr-University Bochum, BG University Hospital Bergmannsheil gGmbH, Bochum, Germany
| | - Michael Mansfield
- Department of Allied Health Sciences, Institute of Health and Social Care, Pain Research Cluster, Ageing, Acute and Long Term Conditions Research Group, London South Bank University, London, United Kingdom
| | - Amelia K. Mardon
- IIMPACT in Health, University of South Australia, Adelaide, South Australia, Australia
| | - Darragh Mattimoe
- Pharmacology and Therapeutics, School of Medicine, Galway Neuroscience Centre and Centre for Pain Research, Human Biology Building, National University of Ireland Galway, Galway, Ireland
| | - Daniel P. McLoone
- Pharmacology and Therapeutics, School of Medicine, Galway Neuroscience Centre and Centre for Pain Research, Human Biology Building, National University of Ireland Galway, Galway, Ireland
| | - Gith Noes-Holt
- Molecular Neuropharmacology and Genetics Laboratory, Department of Neuroscience, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Esther M. Pogatzki-Zahn
- Department of Anesthesiology, Intensive Care and Pain Medicine University Hospital Muenster, Muenster, Germany
| | - Emer Power
- Pharmacology and Therapeutics, School of Medicine, Galway Neuroscience Centre and Centre for Pain Research, Human Biology Building, National University of Ireland Galway, Galway, Ireland
| | - Bruno Pradier
- Department of Anesthesiology, Intensive Care and Pain Medicine University Hospital Muenster, Muenster, Germany
| | - Eleny Romanos-Sirakis
- Staten Island University Hospital Northwell Health, Staten Island, NY, United States
- Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, United States
| | | | - Rafael Vinagre
- Visiting Scholar, Department of Anesthesiology, Perioperative and Pain Medicine, Stanford University School of Medicine, Stanford, CA, United States
| | - Julio A. Yanes
- Department of Psychological Sciences, Auburn University, Auburn, AL, United States
| | - Jingwen Zhang
- King's College London GKT School of Medical Education, King's College London, London, United Kingdom
| | - Xue Ying Zhang
- Pain Research, Department of Surgery and Cancer, Imperial College London, London, United Kingdom
| | - David P. Finn
- Pharmacology and Therapeutics, School of Medicine, Galway Neuroscience Centre and Centre for Pain Research, Human Biology Building, National University of Ireland Galway, Galway, Ireland
| | - Andrew S.C. Rice
- Pain Research, Department of Surgery and Cancer, Imperial College London, London, United Kingdom
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10
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Pradier B, McCormick SJ, Tsuda AC, Chen RW, Atkinson AL, Westrick MR, Buckholtz CL, Kauer JA. Properties of neurons in the superficial laminae of trigeminal nucleus caudalis. Physiol Rep 2020; 7:e14112. [PMID: 31215180 PMCID: PMC6581829 DOI: 10.14814/phy2.14112] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Accepted: 04/24/2019] [Indexed: 02/03/2023] Open
Abstract
The trigeminal nucleus caudalis (TNc) receives extensive afferent innervation from peripheral sensory neurons of the trigeminal ganglion (TG), and is the first central relay in the circuitry underpinning orofacial pain. Despite the initial characterization of the neurons in the superficial laminae, many questions remain. Here we report on electrophysiological properties of 535 superficial lamina I/II TNc neurons. Based on their firing pattern, we assigned these cells to five main groups, including (1) tonic, (2) phasic, (3) delayed, (4) H‐current, and (5) tonic‐phasic neurons, groups that exhibit distinct intrinsic properties and share some similarity with groups identified in the spinal dorsal horn. Driving predominantly nociceptive TG primary afferents using optogenetic stimulation in TRPV1/ChR2 animals, we found that tonic and H‐current cells are most likely to receive pure monosynaptic input, whereas delayed neurons are more likely to exhibit inputs that appear polysynaptic. Finally, for the first time in TNc neurons, we used unsupervised clustering analysis methods and found that the kinetics of the action potentials and other intrinsic properties of these groups differ significantly from one another. Unsupervised spectral clustering based solely on a single voltage response to rheobase current was sufficient to group cells with shared properties independent of action potential discharge pattern, indicating that this approach can be effectively applied to identify functional neuronal subclasses. Together, our data illustrate that cells in the TNc with distinct patterns of TRPV1/ChR2 afferent innervation are physiologically diverse, but can be understood as a few major groups of cells having shared functional properties.
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Affiliation(s)
- Bruno Pradier
- Department of Molecular Pharmacology, Physiology & Biotechnology, Brown University, Carney Institute for Brain Science, Providence, Rhode Island
| | - Samuel J McCormick
- Department of Molecular Pharmacology, Physiology & Biotechnology, Brown University, Carney Institute for Brain Science, Providence, Rhode Island
| | - Ayumi C Tsuda
- Department of Molecular Pharmacology, Physiology & Biotechnology, Brown University, Carney Institute for Brain Science, Providence, Rhode Island
| | - Rudy W Chen
- Department of Molecular Pharmacology, Physiology & Biotechnology, Brown University, Carney Institute for Brain Science, Providence, Rhode Island
| | - Abigail L Atkinson
- Department of Molecular Pharmacology, Physiology & Biotechnology, Brown University, Carney Institute for Brain Science, Providence, Rhode Island
| | - Mollie R Westrick
- Department of Molecular Pharmacology, Physiology & Biotechnology, Brown University, Carney Institute for Brain Science, Providence, Rhode Island
| | - Caroline L Buckholtz
- Department of Molecular Pharmacology, Physiology & Biotechnology, Brown University, Carney Institute for Brain Science, Providence, Rhode Island
| | - Julie A Kauer
- Department of Molecular Pharmacology, Physiology & Biotechnology, Brown University, Carney Institute for Brain Science, Providence, Rhode Island
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11
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Abstract
Of the fast ionotropic synapses, glycinergic synapses are the least well understood, but are vital for the maintenance of inhibitory signaling in the brain and spinal cord. Glycinergic signaling comprises half of the inhibitory signaling in the spinal cord, and glycinergic synapses are likely to regulate local nociceptive processing as well as the transmission to the brain of peripheral nociceptive information. Here we have investigated the rapid and prolonged potentiation of glycinergic synapses in the superficial dorsal horn of young male and female mice after brief activation of NMDA receptors (NMDARs). Glycinergic inhibitory postsynaptic currents (IPSCs) evoked with lamina II-III stimulation in identified GABAergic neurons in lamina II were potentiated by bath-applied Zn2+ and were depressed by the prostaglandin PGE2, consistent with the presence of both GlyRα1- and GlyRα3-containing receptors. NMDA application rapidly potentiated synaptic glycinergic currents. Whole-cell currents evoked by exogenous glycine were also readily potentiated by NMDA, indicating that the potentiation results from altered numbers or conductance of postsynaptic glycine receptors. Repetitive depolarization alone of the postsynaptic GABAergic neuron also potentiated glycinergic synapses, and intracellular EGTA prevented both NMDA-induced and depolarization-induced potentiation of glycinergic IPSCs. Optogenetic activation of trpv1 lineage afferents also triggered NMDAR-dependent potentiation of glycinergic synapses. Our results suggest that during peripheral injury or inflammation, nociceptor firing during injury is likely to potentiate glycinergic synapses on GABAergic neurons. This disinhibition mechanism may be engaged rapidly, altering dorsal horn circuitry to promote the transmission of nociceptive information to the brain.
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Affiliation(s)
- Michelle L. Kloc
- Dept. of Pharmacology, Physiology and Biotechnology, Brown Institute for Brain Science, Brown University, Providence, RI, United States of America
| | - Bruno Pradier
- Dept. of Pharmacology, Physiology and Biotechnology, Brown Institute for Brain Science, Brown University, Providence, RI, United States of America
| | - Anda M. Chirila
- Dept. of Pharmacology, Physiology and Biotechnology, Brown Institute for Brain Science, Brown University, Providence, RI, United States of America
| | - Julie A. Kauer
- Dept. of Pharmacology, Physiology and Biotechnology, Brown Institute for Brain Science, Brown University, Providence, RI, United States of America
- * E-mail: ,
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12
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Pradier B, Erxlebe E, Markert A, Rácz I. Microglial IL-1β progressively increases with duration of alcohol consumption. Naunyn Schmiedebergs Arch Pharmacol 2018; 391:455-461. [DOI: 10.1007/s00210-018-1475-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2017] [Accepted: 01/31/2018] [Indexed: 12/28/2022]
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13
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Ativie F, Albayram O, Bach K, Pradier B, Zimmer A, Bilkei-Gorzo A. Enhanced microglial activity in FAAH−/− animals. Life Sci 2015; 138:52-6. [DOI: 10.1016/j.lfs.2014.12.016] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Revised: 12/02/2014] [Accepted: 12/12/2014] [Indexed: 11/24/2022]
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14
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Pradier B, Erxlebe E, Markert A, Rácz I. Interaction of cannabinoid receptor 2 and social environment modulates chronic alcohol consumption. Behav Brain Res 2015; 287:163-71. [DOI: 10.1016/j.bbr.2015.03.051] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Revised: 03/16/2015] [Accepted: 03/20/2015] [Indexed: 01/20/2023]
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15
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Klauke AL, Racz I, Pradier B, Markert A, Zimmer AM, Gertsch J, Zimmer A. The cannabinoid CB₂ receptor-selective phytocannabinoid beta-caryophyllene exerts analgesic effects in mouse models of inflammatory and neuropathic pain. Eur Neuropsychopharmacol 2014; 24:608-20. [PMID: 24210682 DOI: 10.1016/j.euroneuro.2013.10.008] [Citation(s) in RCA: 174] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Revised: 08/31/2013] [Accepted: 10/12/2013] [Indexed: 11/17/2022]
Abstract
The widespread plant volatile beta-caryophyllene (BCP) was recently identified as a natural selective agonist of the peripherally expressed cannabinoid receptor 2 (CB₂). It is found in relatively high concentrations in many spices and food plants. A number of studies have shown that CB₂ is critically involved in the modulation of inflammatory and neuropathic pain responses. In this study, we have investigated the analgesic effects of BCP in animal models of inflammatory and neuropathic pain. We demonstrate that orally administered BCP reduced inflammatory (late phase) pain responses in the formalin test in a CB₂ receptor-dependent manner, while it had no effect on acute (early phase) responses. In a neuropathic pain model the chronic oral administration of BCP attenuated thermal hyperalgesia and mechanical allodynia, and reduced spinal neuroinflammation. Importantly, we found no signs of tolerance to the anti-hyperalgesic effects of BCP after prolonged treatment. Oral BCP was more effective than the subcutaneously injected synthetic CB₂ agonist JWH-133. Thus, the natural plant product BCP may be highly effective in the treatment of long lasting, debilitating pain states. Our results have important implications for the role of dietary factors in the development and modulation of chronic pain conditions.
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MESH Headings
- Administration, Oral
- Animals
- Anti-Inflammatory Agents, Non-Steroidal/administration & dosage
- Anti-Inflammatory Agents, Non-Steroidal/adverse effects
- Anti-Inflammatory Agents, Non-Steroidal/therapeutic use
- Behavior, Animal/drug effects
- Cannabinoid Receptor Agonists/administration & dosage
- Cannabinoid Receptor Agonists/adverse effects
- Cannabinoid Receptor Agonists/therapeutic use
- Disease Models, Animal
- Gene Expression Regulation/drug effects
- Hyperalgesia/drug therapy
- Hyperalgesia/immunology
- Hyperalgesia/metabolism
- Male
- Mice
- Mice, Congenic
- Motor Activity/drug effects
- Nerve Tissue Proteins/agonists
- Nerve Tissue Proteins/genetics
- Nerve Tissue Proteins/metabolism
- Neuralgia/drug therapy
- Neuralgia/immunology
- Neuralgia/metabolism
- Neurons/drug effects
- Neurons/immunology
- Neurons/metabolism
- Pain Measurement
- Phytochemicals/administration & dosage
- Phytochemicals/adverse effects
- Phytochemicals/therapeutic use
- Polycyclic Sesquiterpenes
- Receptor, Cannabinoid, CB2/agonists
- Receptor, Cannabinoid, CB2/genetics
- Receptor, Cannabinoid, CB2/metabolism
- Sciatic Nerve/drug effects
- Sciatic Nerve/immunology
- Sciatic Nerve/metabolism
- Sciatic Neuropathy/drug therapy
- Sciatic Neuropathy/immunology
- Sciatic Neuropathy/metabolism
- Sesquiterpenes/administration & dosage
- Sesquiterpenes/adverse effects
- Sesquiterpenes/therapeutic use
- Spinal Cord/drug effects
- Spinal Cord/immunology
- Spinal Cord/metabolism
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Affiliation(s)
- A-L Klauke
- Institute of Molecular Psychiatry, University of Bonn, Sigmund-Freud-Straße 25, D-53127 Bonn, Germany
| | - I Racz
- Institute of Molecular Psychiatry, University of Bonn, Sigmund-Freud-Straße 25, D-53127 Bonn, Germany.
| | - B Pradier
- Institute of Molecular Psychiatry, University of Bonn, Sigmund-Freud-Straße 25, D-53127 Bonn, Germany
| | - A Markert
- Institute of Molecular Psychiatry, University of Bonn, Sigmund-Freud-Straße 25, D-53127 Bonn, Germany
| | - A M Zimmer
- Institute of Molecular Psychiatry, University of Bonn, Sigmund-Freud-Straße 25, D-53127 Bonn, Germany
| | - J Gertsch
- Institute of Biochemistry and Molecular Medicine, NCCR TransCure, University of Bern, CH-3012 Bern, Switzerland
| | - A Zimmer
- Institute of Molecular Psychiatry, University of Bonn, Sigmund-Freud-Straße 25, D-53127 Bonn, Germany
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16
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Pradier B, Jeub M, Markert A, Mauer D, Tolksdorf K, Van de Putte T, Seuntjens E, Gailus-Durner V, Fuchs H, Hrabě de Angelis M, Huylebroeck D, Beck H, Zimmer A, Rácz I. Smad-interacting protein 1 affects acute and tonic, but not chronic pain. Eur J Pain 2013; 18:249-57. [PMID: 23861142 DOI: 10.1002/j.1532-2149.2013.00366.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/19/2013] [Indexed: 12/18/2022]
Abstract
BACKGROUND Smad-interacting protein 1 (also named Zeb2 and Zfhx1b) is a transcription factor that plays an important role in neuronal development and, when mutated, causes Mowat-Wilson syndrome (MWS). A corresponding mouse model carrying a heterozygous Zeb2 deletion was comprehensively analysed in the German Mouse Clinic. The most prominent phenotype was the reduced pain sensitivity. In this study, we investigated the role of Zeb2 in inflammatory and neuropathic pain. METHODS For this, we tested mutant Zeb2 animals in different models of inflammatory pain like abdominal constriction, formalin and carrageenan test. Furthermore, we studied the pain reactivity of the mice after peripheral nerve ligation. To examine the nociceptive transmission of primary sensory dorsal root ganglia (DRG) neurons, we determined the neuronal activity in the spinal dorsal horn after the formalin test using staining of c-Fos. Next, we characterized the neuronal cell population in the DRGs and in the sciatic nerve to study the effect of the Zeb2 mutation on peripheral nerve morphology. RESULTS The present data show that Zeb2 is involved in the development of primary sensory DRG neurons, especially of C- and Aδ fibres. These alterations contribute to a hypoalgesic phenotype in inflammatory but not in neuropathic pain in these Zeb2(+/-) mice. CONCLUSION Our data suggest that the under-reaction to pain observed in MWS patients results from a reduced responsivity to nociceptive stimulation rather than an inability to communicate discomfort.
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Affiliation(s)
- B Pradier
- Institute of Molecular Psychiatry, University of Bonn Medical Center, Germany
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17
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Rosenthal E, Olivier V, Pradier B, Marty P, Bentz L, Cassuto JP. Leishmaniose viscérale chez les malades infectés par le VIH. La maladie de Kaposi est-elle un facteur de risque ? Rev Med Interne 1995. [DOI: 10.1016/0248-8663(96)86547-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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18
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Affiliation(s)
- P. Laurent
- Univ. Libre Bruxelles, Service Chimie Generale Carbochimie, Brussels, Belgium
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