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Sadighparvar S, Al-Hamed FS, Sharif-Naeini R, Meloto CB. Preclinical orofacial pain assays and measures and chronic primary orofacial pain research: where we are and where we need to go. FRONTIERS IN PAIN RESEARCH 2023; 4:1150749. [PMID: 37293433 PMCID: PMC10244561 DOI: 10.3389/fpain.2023.1150749] [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: 01/24/2023] [Accepted: 04/11/2023] [Indexed: 06/10/2023] Open
Abstract
Chronic primary orofacial pain (OFP) conditions such as painful temporomandibular disorders (pTMDs; i.e., myofascial pain and arthralgia), idiopathic trigeminal neuralgia (TN), and burning mouth syndrome (BMS) are seemingly idiopathic, but evidence support complex and multifactorial etiology and pathophysiology. Important fragments of this complex array of factors have been identified over the years largely with the help of preclinical studies. However, findings have yet to translate into better pain care for chronic OFP patients. The need to develop preclinical assays that better simulate the etiology, pathophysiology, and clinical symptoms of OFP patients and to assess OFP measures consistent with their clinical symptoms is a challenge that needs to be overcome to support this translation process. In this review, we describe rodent assays and OFP pain measures that can be used in support of chronic primary OFP research, in specific pTMDs, TN, and BMS. We discuss their suitability and limitations considering the current knowledge of the etiology and pathophysiology of these conditions and suggest possible future directions. Our goal is to foster the development of innovative animal models with greater translatability and potential to lead to better care for patients living with chronic primary OFP.
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Affiliation(s)
- Shirin Sadighparvar
- Integrated Program in Neuroscience, McGill University, Montreal, QC, Canada
- The Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada
| | | | - Reza Sharif-Naeini
- The Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada
- Department of Physiology and Cell Information Systems, McGill University, Montreal, QC, Canada
| | - Carolina Beraldo Meloto
- The Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada
- Faculty of Dental Medicine and Oral Health Sciences, McGill University, Montreal, QC, Canada
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2
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Brusco I, Fialho MFP, Becker G, Brum ES, Favarin A, Marquezin LP, Serafini PT, Oliveira SM. Kinins and their B 1 and B 2 receptors as potential therapeutic targets for pain relief. Life Sci 2023; 314:121302. [PMID: 36535404 DOI: 10.1016/j.lfs.2022.121302] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Revised: 12/07/2022] [Accepted: 12/13/2022] [Indexed: 12/23/2022]
Abstract
Kinins are endogenous peptides that belong to the kallikrein-kinin system, which has been extensively studied for over a century. Their essential role in multiple physiological and pathological processes is demonstrated by activating two transmembrane G-protein-coupled receptors, the kinin B1 and B2 receptors. The attention is mainly given to the pathological role of kinins in pain transduction mechanisms. In the past years, a wide range of preclinical studies has amounted to the literature reinforcing the need for an updated review about the participation of kinins and their receptors in pain disorders. Here, we performed an extensive literature search since 2004, describing the historical progress and the current understanding of the kinin receptors' participation and its potential therapeutic in several acute and chronic painful conditions. These include inflammatory (mainly arthritis), neuropathic (caused by different aetiologies, such as cancer, multiple sclerosis, antineoplastic toxicity and diabetes) and nociplastic (mainly fibromyalgia) pain. Moreover, we highlighted the pharmacological actions and possible clinical applications of the kinin B1 and B2 receptor antagonists, kallikrein inhibitors or kallikrein-kinin system signalling pathways-target molecules in these different painful conditions. Notably, recent findings sought to elucidate mechanisms for guiding new and better drug design targeting kinin B1 and B2 receptors to treat a disease diversity. Since the kinin B2 receptor antagonist, Icatibant, is clinically used and well-tolerated by patients with hereditary angioedema gives us hope kinin receptors antagonists could be more robustly tested for a possible clinical application in the treatment of pathological pains, which present limited pharmacology management.
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Affiliation(s)
- Indiara Brusco
- Graduate Program in Biological Sciences: Biochemistry Toxicology, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Maria Fernanda Pessano Fialho
- Graduate Program in Biological Sciences: Biochemistry Toxicology, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Gabriela Becker
- Graduate Program in Biological Sciences: Biochemistry Toxicology, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Evelyne Silva Brum
- Graduate Program in Biological Sciences: Biochemistry Toxicology, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Amanda Favarin
- Laboratory of Neurotoxicity and Psychopharmacology, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Lara Panazzolo Marquezin
- Laboratory of Neurotoxicity and Psychopharmacology, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Patrick Tuzi Serafini
- Laboratory of Neurotoxicity and Psychopharmacology, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Sara Marchesan Oliveira
- Graduate Program in Biological Sciences: Biochemistry Toxicology, Federal University of Santa Maria, Santa Maria, RS, Brazil.
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CaV3.2 calcium channels contribute to trigeminal neuralgia. Pain 2022; 163:2315-2325. [PMID: 35467587 DOI: 10.1097/j.pain.0000000000002651] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Accepted: 03/23/2022] [Indexed: 11/27/2022]
Abstract
ABSTRACT Trigeminal neuralgia (TN) is a rare but debilitating disorder characterized by excruciating facial pain, with a higher incidence in women. Recent studies demonstrated that TN patients present mutations in the gene encoding the CaV3.2 T-type calcium channel, an important player in peripheral pain pathways. Here we characterize the role of CaV3.2 channels in TN at two levels. First, we examined the biophysical properties of CACNA1H variants found in TN patients. Second, we investigated the role of CaV3.2 in an animal model of trigeminal neuropathic pain. Whole cell patch clamp recordings from four different mutants expressed in tsA-201 cells (E286K in the pore loop of domain I, H526Y, G563R and P566T in the domain I-II linker) identified a loss-of-function in activation in the E286K mutation and gain-of-function in the G563R and P566T mutations. Moreover, a loss-of-function in inactivation was observed with the E286K and H526Y mutations. Cell surface biotinylation revealed no difference in channel trafficking among the variants. The G563R mutant also caused a gain-of-function in the firing properties of transfected trigeminal ganglion neurons. In female and male mice, constriction of the infraorbital nerve (CION) induced facial thermal heat hyperalgesia. Block of T-type channels with Z944 resulted in antihyperalgesia. The effect of Z944 was absent in CaV3.2-/- mice, indicating that CaV3.2 is the molecular target of the antihyperalgesic Z944 effect. Finally, ELISA analysis revealed increased CaV3.2 channel expression in the spinal trigeminal subnucleus caudalis. Altogether, the present study demonstrates an important role of CaV3.2 channels in trigeminal pain.
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Araya EI, Carvalho EC, Andreatini R, Zamponi GW, Chichorro JG. Trigeminal neuropathic pain causes changes in affective processing of pain in rats. Mol Pain 2022; 18:17448069211057750. [PMID: 35042377 PMCID: PMC8777332 DOI: 10.1177/17448069211057750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
Trigeminal neuropathic pain has been modeled in rodents through the constriction of the
infraorbital nerve (CCI-ION). Sensory alterations, including spontaneous pain, and thermal
and mechanical hyperalgesia are well characterized, but there is a notable lack of
evidence about the affective pain component in this model. Evaluation of the emotional
component of pain in rats has been proposed as a way to optimize potential translational
value of non-clinical studies. In rats, 22 and 50 kHz ultrasonic vocalizations (USVs) are
considered well-established measures of negative and positive emotional states,
respectively. Thus, this study tested the hypothesis that trigeminal neuropathic pain
would result, in addition to the sensory alterations, in a decrease of 50 kHz USV, which
may be related to altered function of brain areas involved in emotional pain processing.
CCI-ION surgery was performed on 60-day-old male Wistar rats. 15 days after surgery, von
Frey filaments were applied to detect mechanical hyperalgesia, and USV was recorded. At
the same timepoint, systemic treatment with d,l-amphetamine (1 mg/kg) allowed
investigation of the involvement of the dopaminergic system in USV emission. Finally,
brain tissue was collected to assess the change in tyrosine hydroxylase (TH) expression in
the nucleus accumbens (NAc) and c-Fos expression in brain areas involved in emotional pain
processing, including the prefrontal cortex (PFC), amygdala, and NAc. The results showed
that CCI-ION rats presented mechanical hyperalgesia and a significant reduction of
environmental-induced 50 kHz USV. Amphetamine caused a marked increase in 50 kHz USV
emission in CCI-ION rats. In addition, TH expression was lower in constricted animals and
c-Fos analysis revealed an increase in neuronal activation. Taken together, these data
indicate that CCI-ION causes a reduction in the emission of environmental-induced
appetitive calls concomitantly with facial mechanical hyperalgesia and that both changes
may be related to a reduction in the mesolimbic dopaminergic activity.
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Affiliation(s)
- Erika I Araya
- Department of Pharmacology, Biological Sciences Building, 232174Federal University of Parana, Curitiba, Brazil
| | - Eduardo C Carvalho
- Department of Pharmacology, Biological Sciences Building, 232174Federal University of Parana, Curitiba, Brazil
| | - Roberto Andreatini
- Department of Pharmacology, Biological Sciences Building, 232174Federal University of Parana, Curitiba, Brazil
| | - Gerald W Zamponi
- Department of Physiology and Pharmacology, Alberta Children's Hospital Research Institute, Hotchkiss Brain Institute, Cumming School of Medicine, 70401University of Calgary, Calgary, AB, Canada
| | - Juliana G Chichorro
- Department of Pharmacology, Biological Sciences Building, 232174Federal University of Parana, Curitiba, Brazil
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Terashima R, Kimura M, Higashikawa A, Kojima Y, Ichinohe T, Tazaki M, Shibukawa Y. Intracellular Ca 2+ mobilization pathway via bradykinin B 1 receptor activation in rat trigeminal ganglion neurons. J Physiol Sci 2019; 69:199-209. [PMID: 30182285 PMCID: PMC10717581 DOI: 10.1007/s12576-018-0635-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Accepted: 08/20/2018] [Indexed: 10/28/2022]
Abstract
Bradykinin (BK) and its receptors, B1 and B2, in trigeminal ganglion (TG) neurons are involved in the regulation of pain. Recent studies have revealed that B1 receptors are expressed in neonatal rat TG neurons; however, the intracellular signaling pathway following B1 receptor activation remains to be elucidated. To investigate the mechanism by which B1 receptor activation leads to intracellular Ca2+ mobilization, we measured the intracellular free Ca2+ concentration ([Ca2+]i) in primary-cultured TG neurons. The application of Lys-[Des-Arg9]BK (B1 receptor agonist) increased the [Ca2+]i in these TG neurons even in the absence of extracellular Ca2+. Pretreatment with inhibitors of ryanodine receptors or sarco/endoplasmic reticulum Ca2+-ATPase suppressed the increase in Lys-[Des-Arg9]BK-induced [Ca2+]i. The Lys-[Des-Arg9]BK-induced [Ca2+]i increase was unaffected by phospholipase-C inhibitor. B1 receptor activation-induced [Ca2+]i increase was suppressed by phosphodiesterase inhibitor and enhanced by adenylyl cyclase inhibitor. These results suggest that B1 receptor activation suppresses intracellular cAMP production via adenylyl cyclase inhibition and mobilizes intracellular Ca2+ via ryanodine receptors that access intracellular Ca2+ stores.
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Affiliation(s)
- Reiko Terashima
- Department of Dental Anesthesiology, Tokyo Dental College, Tokyo, 101-0061, Japan
- Department of Physiology, Tokyo Dental College, Tokyo, 101-0061, Japan
| | - Maki Kimura
- Department of Physiology, Tokyo Dental College, Tokyo, 101-0061, Japan
| | - Asuka Higashikawa
- Department of Physiology, Tokyo Dental College, Tokyo, 101-0061, Japan
| | - Yuki Kojima
- Department of Physiology, Tokyo Dental College, Tokyo, 101-0061, Japan
| | - Tatsuya Ichinohe
- Department of Dental Anesthesiology, Tokyo Dental College, Tokyo, 101-0061, Japan
| | - Masakazu Tazaki
- Department of Physiology, Tokyo Dental College, Tokyo, 101-0061, Japan
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Choi SI, Hwang SW. Depolarizing Effectors of Bradykinin Signaling in Nociceptor Excitation in Pain Perception. Biomol Ther (Seoul) 2018; 26:255-267. [PMID: 29378387 PMCID: PMC5933892 DOI: 10.4062/biomolther.2017.127] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2017] [Revised: 10/13/2017] [Accepted: 10/24/2017] [Indexed: 12/23/2022] Open
Abstract
Inflammation is one of the main causes of pathologic pain. Knowledge of the molecular links between inflammatory signals and pain-mediating neuronal signals is essential for understanding the mechanisms behind pain exacerbation. Some inflammatory mediators directly modulate the excitability of pain-mediating neurons by contacting the receptor molecules expressed in those neurons. For decades, many discoveries have accumulated regarding intraneuronal signals from receptor activation through electrical depolarization for bradykinin, a major inflammatory mediator that is able to both excite and sensitize pain-mediating nociceptor neurons. Here, we focus on the final effectors of depolarization, the neuronal ion channels, whose functionalities are specifically affected by bradykinin stimulation. Particular G-protein coupled signaling cascades specialized for each specific depolarizer ion channels are summarized. Some of these ion channels not only serve as downstream effectors but also play critical roles in relaying specific pain modalities such as thermal or mechanical pain. Accordingly, specific pain phenotypes altered by bradykinin stimulation are also discussed. Some members of the effector ion channels are both activated and sensitized by bradykinin-induced neuronal signaling, while others only sensitized or inhibited, which are also introduced. The present overview of the effect of bradykinin on nociceptor neuronal excitability at the molecular level may contribute to better understanding of an important aspect of inflammatory pain and help future design of further research on the components involved and pain modulating strategies.
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Affiliation(s)
- Seung-In Choi
- Department of Biomedical Sciences and Department of Physiology, Korea University College of Medicine, Seoul 02841, Republic of Korea
| | - Sun Wook Hwang
- Department of Biomedical Sciences and Department of Physiology, Korea University College of Medicine, Seoul 02841, Republic of Korea
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Gomes LO, Chichorro JG, Araya EI, de Oliveira J, Rae GA. Facial hyperalgesia due to direct action of endothelin-1 in the trigeminal ganglion of mice. J Pharm Pharmacol 2018; 70:893-900. [DOI: 10.1111/jphp.12905] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Accepted: 02/10/2018] [Indexed: 12/23/2022]
Abstract
Abstract
Objective
This study assessed the ability of endothelin-1 (ET-1) to evoke heat hyperalgesia when injected directly into the trigeminal ganglia (TG) of mice and determined the receptors implicated in this effect. The effects of TG ETA and ETB receptor blockade on alleviation of heat hyperalgesia in a model of trigeminal neuropathic pain induced by infraorbital nerve constriction (CION) were also examined.
Methods
Naive mice received an intraganglionar (i.g.) injection of ET-1 (0.3–3 pmol) or the selective ETBR agonist sarafotoxin S6c (3–30 pmol), and response latencies to ipsilateral heat stimulation were assessed before the treatment and at 1-h intervals up to 5 h after the treatment. Heat hyperalgesia induced by i.g. ET-1 or CION was assessed after i.g. injections of ETAR and ETBR antagonists (BQ-123 and BQ-788, respectively, each at 0.5 nmol).
Key findings
Intraganglionar ET-1 or sarafotoxin S6c injection induced heat hyperalgesia lasting 4 and 2 h, respectively. Heat hyperalgesia induced by ET-1 was attenuated by i.g. BQ-123 or BQ-788. On day 5 after CION, i.g. BQ-788 injection produced a more robust antihyperalgesic effect compared with BQ-123.
Conclusions
ET-1 injection into the TG promotes ETAR/ETBR-mediated facial heat hyperalgesia, and both receptors are clearly implicated in CION-induced hyperalgesia in the murine TG system.
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Affiliation(s)
- Lenyta Oliveira Gomes
- Department of Pharmacology, Center of Biological Sciences, Federal University of Santa Catarina, Florianopolis, Santa Catarina, Brazil
| | - Juliana Geremias Chichorro
- Department of Pharmacology, Biological Sciences Sector, Federal University of Parana, Curitiba, Parana, Brazil
| | - Erika Ivanna Araya
- Department of Pharmacology, Biological Sciences Sector, Federal University of Parana, Curitiba, Parana, Brazil
| | - Jade de Oliveira
- Department of Biochemistry, Center of Biological Sciences, Federal University of Santa Catarina, Florianopolis, Santa Catarina, Brazil
| | - Giles Alexander Rae
- Department of Pharmacology, Center of Biological Sciences, Federal University of Santa Catarina, Florianopolis, Santa Catarina, Brazil
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Teixeira JM, Parada CA, Tambeli CH. A cyclic pathway of P2 × 7, bradykinin, and dopamine receptor activation induces a sustained articular hyperalgesia in the knee joint of rats. Inflamm Res 2017; 67:301-314. [PMID: 29260240 DOI: 10.1007/s00011-017-1122-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 11/27/2017] [Accepted: 11/29/2017] [Indexed: 12/27/2022] Open
Abstract
OBJECTIVE We investigated whether: (1) P2 × 7 receptor activation by its agonist (BzATP) induces articular hyperalgesia in the rat's knee joint via inflammatory mechanisms and (2) activation of P2 × 7 receptors by endogenous ATP contributes to the articular hyperalgesia induced by bradykinin, TNF-α, IL-1β, CINC-1, PGE2, and dopamine. METHODS The articular hyperalgesia was quantified using the rat knee joint incapacitation test. The knee joint inflammation, characterized by the concentration of pro-inflammatory cytokines and by neutrophil migration, was quantified in the synovial lavage fluid by ELISA and myeloperoxidase enzyme activity assay, respectively. RESULTS BzATP induced a dose-dependent articular hyperalgesia in the rat's knee joint that was significantly reduced by the selective antagonists for P2 × 7, bradykinin B1 or B2 receptors, β1 or β2 adrenoceptors, and by pre-treatment with Indomethacin. BzATP induced a local increase of TNF-α, IL-1β, IL-6, and CINC-1 concentration and neutrophil migration into the knee joint. The co-administration of the selective P2 × 7 receptor antagonist A-740003 significantly reduced the articular hyperalgesia induced by bradykinin and dopamine, but not by TNF-α, IL-1β, CINC-1, and PGE2. CONCLUSIONS P2 × 7 receptor activation induces articular hyperalgesia mediated by the previous inflammatory mediator release. P2 × 7 receptor-induced articular hyperalgesia is sustained by the involvement of this purinergic receptor in bradykinin and dopamine-induced hyperalgesia in the knee joint.
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Affiliation(s)
- Juliana Maia Teixeira
- Department of Structural and Functional Biology, Institute of Biology, State University of Campinas, UNICAMP, Rua Monteiro Lobato, 255, Campinas, SP, CEP 13083-862, Brazil
| | - Carlos Amílcar Parada
- Department of Structural and Functional Biology, Institute of Biology, State University of Campinas, UNICAMP, Rua Monteiro Lobato, 255, Campinas, SP, CEP 13083-862, Brazil
| | - Cláudia Herrera Tambeli
- Department of Structural and Functional Biology, Institute of Biology, State University of Campinas, UNICAMP, Rua Monteiro Lobato, 255, Campinas, SP, CEP 13083-862, Brazil.
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Guo QH, Tong QH, Lu N, Cao H, Yang L, Zhang YQ. Proteomic Analysis of the Hippocampus in Mouse Models of Trigeminal Neuralgia and Inescapable Shock-Induced Depression. Neurosci Bull 2017; 34:74-84. [PMID: 28424990 DOI: 10.1007/s12264-017-0131-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Accepted: 02/06/2017] [Indexed: 12/31/2022] Open
Abstract
To investigate the behavioral and biomolecular similarity between neuralgia and depression, a trigeminal neuralgia (TN) mouse model was established by constriction of the infraorbital nerve (CION) to mimic clinical trigeminal neuropathic pain. A mouse learned helplessness (LH) model was developed to investigate inescapable foot-shock-induced psychiatric disorders like depression in humans. Mass spectrometry was used to assess changes in the biomolecules and signaling pathways in the hippocampus from TN or LH mice. TN mice developed not only significant mechanical allodynia but also depressive-like behaviors (mainly behavioral despair) at 2 weeks after CION, similar to LH mice. MS analysis demonstrated common and distinctive protein changes in the hippocampus between groups. Many protein function families (such as cell-to-cell signaling and interaction, and cell assembly and organization,) and signaling pathways (e.g., the Huntington's disease pathway) were involved in chronic neuralgia and depression. Together, these results demonstrated that the LH and TN models both develop depressive-like behaviors, and revealed the involvement of many psychiatric disorder-related biomolecules/pathways in the pathogenesis of TN and LH.
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Affiliation(s)
- Qing-Huan Guo
- Institutes of Brain Science, State Key Laboratory of Medical Neurobiology and Collaborative Innovation Center for Brain Science, Fudan University, Shanghai, 200032, China
| | - Qing-He Tong
- Shanghai Cancer Center and Institutes of Biomedical Sciences, Fudan University, Shanghai, 200032, China
| | - Ning Lu
- Institutes of Brain Science, State Key Laboratory of Medical Neurobiology and Collaborative Innovation Center for Brain Science, Fudan University, Shanghai, 200032, China
| | - Hong Cao
- Institutes of Brain Science, State Key Laboratory of Medical Neurobiology and Collaborative Innovation Center for Brain Science, Fudan University, Shanghai, 200032, China.
| | - Liu Yang
- Institutes of Brain Science, State Key Laboratory of Medical Neurobiology and Collaborative Innovation Center for Brain Science, Fudan University, Shanghai, 200032, China
| | - Yu-Qiu Zhang
- Institutes of Brain Science, State Key Laboratory of Medical Neurobiology and Collaborative Innovation Center for Brain Science, Fudan University, Shanghai, 200032, China.
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Nones C, Claudino R, Ferreira L, Dos Reis R, King T, Chichorro J. Descending facilitatory pain pathways mediate ongoing pain and tactile hypersensitivity in a rat model of trigeminal neuropathic pain. Neurosci Lett 2017; 644:18-23. [DOI: 10.1016/j.neulet.2017.02.047] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Revised: 02/01/2017] [Accepted: 02/18/2017] [Indexed: 11/24/2022]
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Trevisan G, Benemei S, Materazzi S, De Logu F, De Siena G, Fusi C, Fortes Rossato M, Coppi E, Marone IM, Ferreira J, Geppetti P, Nassini R. TRPA1 mediates trigeminal neuropathic pain in mice downstream of monocytes/macrophages and oxidative stress. Brain 2016; 139:1361-77. [PMID: 26984186 DOI: 10.1093/brain/aww038] [Citation(s) in RCA: 129] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Accepted: 01/24/2016] [Indexed: 02/04/2023] Open
Abstract
Despite intense investigation, the mechanisms of the different forms of trigeminal neuropathic pain remain substantially unidentified. The transient receptor potential ankyrin 1 channel (encoded by TRPA1) has been reported to contribute to allodynia or hyperalgesia in some neuropathic pain models, including those produced by sciatic nerve constriction. However, the role of TRPA1 and the processes that cause trigeminal pain-like behaviours from nerve insult are poorly understood. The role of TRPA1, monocytes and macrophages, and oxidative stress in pain-like behaviour evoked by the constriction of the infraorbital nerve in mice were explored. C57BL/6 and wild-type (Trpa1(+/+)) mice that underwent constriction of the infraorbital nerve exhibited prolonged (20 days) non-evoked nociceptive behaviour and mechanical, cold and chemical hypersensitivity in comparison to sham-operated mice (P < 0.05-P < 0.001). Both genetic deletion of Trpa1 (Trpa1(-/-)) and pharmacological blockade (HC-030031 and A-967079) abrogated pain-like behaviours (both P < 0.001), which were abated by the antioxidant, α-lipoic acid, and the nicotinamide adenine dinucleotide phosphate oxidase inhibitor, apocynin (both P < 0.001). Nociception and hypersensitivity evoked by constriction of the infraorbital nerve was associated with intra- and perineural monocytic and macrophagic invasion and increased levels of oxidative stress by-products (hydrogen peroxide and 4-hydroxynonenal). Attenuation of monocyte/macrophage increase by systemic treatment with an antibody against the monocyte chemoattractant chemokine (C-C motif) ligand 2 (CCL2) or the macrophage-depleting agent, clodronate (both P < 0.05), was associated with reduced hydrogen peroxide and 4-hydroxynonenal perineural levels and pain-like behaviours (all P < 0.01), which were abated by perineural administration of HC-030031, α-lipoic acid or the anti-CCL2 antibody (all P < 0.001). The present findings propose that, in the constriction of the infraorbital nerve model of trigeminal neuropathic pain, pain-like behaviours are entirely mediated by the TRPA1 channel, targeted by increased oxidative stress by-products released from monocytes and macrophages clumping at the site of nerve injury.
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Affiliation(s)
- Gabriela Trevisan
- Laboratory of Cellular and Molecular Biology, Graduate Program in Health Sciences, University of the Extreme South of Santa Catarina (UNESC), Criciúma 88806-000, SC, Brazil
| | - Silvia Benemei
- Department of Health Sciences, Clinical Pharmacology and Oncology Unit, University of Florence, Florence 50139, Italy
| | - Serena Materazzi
- Department of Health Sciences, Clinical Pharmacology and Oncology Unit, University of Florence, Florence 50139, Italy
| | - Francesco De Logu
- Department of Health Sciences, Clinical Pharmacology and Oncology Unit, University of Florence, Florence 50139, Italy
| | - Gaetano De Siena
- Department of Health Sciences, Clinical Pharmacology and Oncology Unit, University of Florence, Florence 50139, Italy
| | - Camilla Fusi
- Department of Health Sciences, Clinical Pharmacology and Oncology Unit, University of Florence, Florence 50139, Italy
| | - Mateus Fortes Rossato
- Department of Pharmacology, Federal University of Santa Catarina (UFSC), Florianópolis 88040-900, SC, Brazil
| | - Elisabetta Coppi
- Department of Health Sciences, Clinical Pharmacology and Oncology Unit, University of Florence, Florence 50139, Italy
| | - Ilaria Maddalena Marone
- Department of Health Sciences, Clinical Pharmacology and Oncology Unit, University of Florence, Florence 50139, Italy
| | - Juliano Ferreira
- Department of Health Sciences, Clinical Pharmacology and Oncology Unit, University of Florence, Florence 50139, Italy Department of Pharmacology, Federal University of Santa Catarina (UFSC), Florianópolis 88040-900, SC, Brazil
| | - Pierangelo Geppetti
- Department of Health Sciences, Clinical Pharmacology and Oncology Unit, University of Florence, Florence 50139, Italy
| | - Romina Nassini
- Department of Health Sciences, Clinical Pharmacology and Oncology Unit, University of Florence, Florence 50139, Italy
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Luiz AP, Kopach O, Santana-Varela S, Wood JN. The role of Nav1.9 channel in the development of neuropathic orofacial pain associated with trigeminal neuralgia. Mol Pain 2015; 11:72. [PMID: 26607325 PMCID: PMC4658751 DOI: 10.1186/s12990-015-0076-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Accepted: 11/12/2015] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Trigeminal neuralgia is accompanied by severe mechanical, thermal and chemical hypersensitivity of the orofacial area innervated by neurons of trigeminal ganglion (TG). We examined the role of the voltage-gated sodium channel subtype Nav1.9 in the development of trigeminal neuralgia. RESULTS We found that Nav1.9 is required for the development of both thermal and mechanical hypersensitivity induced by constriction of the infraorbital nerve (CION). The CION model does not induce change on Nav1.9 mRNA expression in the ipsilateral TG neurons when evaluated 9 days after surgery. CONCLUSIONS These results demonstrate that Nav1.9 channels play a critical role in the development of orofacial neuropathic pain. New routes for the treatment of orofacial neuropathic pain focussing on regulation of the voltage-gated Nav1.9 sodium channel activity should be investigated.
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Affiliation(s)
- Ana Paula Luiz
- Molecular Nociception Group, Wolfson Institute for Biomedical Research, University College London, Gower St, London, WC1E 6BT, UK.
| | - Olga Kopach
- Molecular Nociception Group, Wolfson Institute for Biomedical Research, University College London, Gower St, London, WC1E 6BT, UK.
| | - Sonia Santana-Varela
- Molecular Nociception Group, Wolfson Institute for Biomedical Research, University College London, Gower St, London, WC1E 6BT, UK.
| | - John N Wood
- Molecular Nociception Group, Wolfson Institute for Biomedical Research, University College London, Gower St, London, WC1E 6BT, UK. .,Department of Molecular Medicine and Biopharmaceutical Sciences, College of Medicine, Seoul National University, Seoul, South Korea.
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13
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Kawaguchi A, Sato M, Kimura M, Yamazaki T, Yamamoto H, Tazaki M, Ichinohe T, Shibukawa Y. Functional expression of bradykinin B1 and B2 receptors in neonatal rat trigeminal ganglion neurons. Front Cell Neurosci 2015; 9:229. [PMID: 26124706 PMCID: PMC4466439 DOI: 10.3389/fncel.2015.00229] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Accepted: 06/01/2015] [Indexed: 01/03/2023] Open
Abstract
Bradykinin (BK) and its receptors (B1 and B2 receptors) play important roles in inflammatory nociception. However, the patterns of expression and physiological/pathological functions of B1 and B2 receptors in trigeminal ganglion (TG) neurons remain to be fully elucidated. We investigated the functional expression of BK receptors in rat TG neurons. We observed intense immunoreactivity of B2 receptors in TG neurons, while B1 receptors showed weak immunoreactivity. Expression of the B2 receptor colocalized with immunoreactivities against the pan-neuronal marker, neurofilament H, substance P, isolectin B4, and tropomyosin receptor kinase A antibodies. Both in the presence and absence of extracellular Ca2+ ([Ca2+]o), BK application increased the concentration of intracellular free Ca2+ ([Ca2+]i). The amplitudes of BK-induced [Ca2+]i increase in the absence of [Ca2+]o were significantly smaller than those in the presence of Ca2+. In the absence of [Ca2+]o, BK-induced [Ca2+]i increases were sensitive to B2 receptor antagonists, but not to a B1 receptor antagonist. However, B1 receptor agonist, Lys-[Des-Arg9]BK, transiently increased [Ca2+]i in primary cultured TG neurons, and these increases were sensitive to a B1 receptor antagonist in the presence of [Ca2+]o. These results indicated that B2 receptors were constitutively expressed and their activation induced the mobilization of [Ca2+]i from intracellular stores with partial Ca2+ influx by BK. Although constitutive B1 receptor expression could not be clearly observed immunohistochemically in the TG cryosection, cultured TG neurons functionally expressed B1 receptors, suggesting that both B1 and B2 receptors involve pathological and physiological nociceptive functions.
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Affiliation(s)
- Aya Kawaguchi
- Department of Dental Anesthesiology, Tokyo Dental College Tokyo, Japan
| | - Masaki Sato
- Department of Physiology, Tokyo Dental College Tokyo, Japan
| | - Maki Kimura
- Department of Physiology, Tokyo Dental College Tokyo, Japan
| | - Takaki Yamazaki
- Department of Histology and Developmental Biology, Tokyo Dental College Tokyo, Japan
| | - Hitoshi Yamamoto
- Department of Histology and Developmental Biology, Tokyo Dental College Tokyo, Japan
| | | | - Tatsuya Ichinohe
- Department of Dental Anesthesiology, Tokyo Dental College Tokyo, Japan
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14
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Luiz AP, Schroeder SD, Rae GA, Calixto JB, Chichorro JG. Contribution and interaction of kinin receptors and dynorphin A in a model of trigeminal neuropathic pain in mice. Neuroscience 2015; 300:189-200. [PMID: 25982562 DOI: 10.1016/j.neuroscience.2015.05.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Revised: 05/05/2015] [Accepted: 05/06/2015] [Indexed: 01/29/2023]
Abstract
Infraorbital nerve constriction (CION) causes hypersensitivity to facial mechanical, heat and cold stimulation in rats and mice and is a reliable model to study trigeminal neuropathic pain. In this model there is evidence that mechanisms operated by kinin B1 and B2 receptors contribute to heat hyperalgesia in both rats and mice. Herein we further explored this issue and assessed the role of kinin receptors in mechanical hyperalgesia after CION. Swiss and C57Bl/6 mice that underwent CION or sham surgery or dynorphin A (1-17) administration were repeatedly submitted to application of either heat stimuli to the snout or mechanical stimuli to the forehead. Treatment of the animals on the fifth day after CION surgery with DALBK (B1 receptor antagonist) or HOE-140 (B2 receptor antagonist), both at 0.01-1μmol/kg (i.p.), effectively reduced CION-induced mechanical hyperalgesia. Knockout mice for kinin B1, B2 or B1/B2 receptors did not develop heat or mechanical hyperalgesia in response to CION. Subarachnoid dynorphin A (1-17) delivery (15nmol/5μL) also resulted in orofacial heat hyperalgesia, which was attenuated by post-treatment with DALBK (1 and 3μmol/kg, i.p.), but was not affected by HOE-140. Additionally, treatment with an anti-dynorphin A antiserum (200μg/5μL, s.a.) reduced CION-induced heat hyperalgesia for up to 2h. These results suggest that both kinin B1 and B2 receptors are relevant in orofacial sensory nociceptive changes induced by CION. Furthermore, they also indicate that dynorphin A could stimulate kinin receptors and this effect seems to contribute to the maintenance of trigeminal neuropathic pain.
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Affiliation(s)
- A P Luiz
- Department of Pharmacology, Federal University of Santa Catarina, Florianopolis, SC, Brazil.
| | - S D Schroeder
- Department of Pharmacology, Federal University of Santa Catarina, Florianopolis, SC, Brazil
| | - G A Rae
- Department of Pharmacology, Federal University of Santa Catarina, Florianopolis, SC, Brazil
| | - J B Calixto
- Department of Pharmacology, Federal University of Santa Catarina, Florianopolis, SC, Brazil; Center of Innovation and Pre-clinical Trials, Florianopolis, SC, Brazil
| | - J G Chichorro
- Department of Pharmacology, Federal University of Parana, Curitiba, PR, Brazil
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15
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Szteyn K, Gomez R, Berg KA, Jeske NA. Divergence in endothelin-1- and bradykinin-activated store-operated calcium entry in afferent sensory neurons. ASN Neuro 2015; 7:7/2/1759091415578714. [PMID: 25873305 PMCID: PMC4397213 DOI: 10.1177/1759091415578714] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Endothelin-1 (ET-1) and bradykinin (BK) are endogenous peptides that signal through Gαq/11-protein coupled receptors (GPCRs) to produce nociceptor sensitization and pain. Both peptides activate phospholipase C to stimulate Ca2+ accumulation, diacylglycerol production, and protein kinase C activation and are rapidly desensitized via a G-protein receptor kinase 2-dependent mechanism. However, ET-1 produces a greater response and longer lasting nocifensive behavior than BK in multiple models, indicating a potentially divergent signaling mechanism in primary afferent sensory neurons. Using cultured sensory neurons, we demonstrate significant differences in both Ca2+ influx and Ca2+ release from intracellular stores following ET-1 and BK treatments. As intracellular store depletion may contribute to the regulation of other signaling cascades downstream of GPCRs, we concentrated our investigation on store-operated Ca2+ channels. Using pharmacological approaches, we identified transient receptor potential canonical channel 3 (TRPC3) as a dominant contributor to Ca2+ influx subsequent to ET-1 treatment. On the other hand, BK treatment stimulated Orai1 activation, with only minor input from TRPC3. Taken together, data presented here suggest that ET-1 signaling targets TRPC3, generating a prolonged Ca2+ signal that perpetuates nocifensive responses. In contrast, Orai1 dominates as the downstream target of BK receptor activation and results in transient intracellular Ca2+ increases and abridged nocifensive responses.
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Affiliation(s)
- Kalina Szteyn
- Department of Oral and Maxillofacial Surgery, University of Texas Health Science Center at San Antonio, TX, USA
| | - Ruben Gomez
- Department of Oral and Maxillofacial Surgery, University of Texas Health Science Center at San Antonio, TX, USA
| | - Kelly A Berg
- Department of Pharmacology, University of Texas Health Science Center at San Antonio, TX, USA
| | - Nathaniel A Jeske
- Department of Oral and Maxillofacial Surgery, University of Texas Health Science Center at San Antonio, TX, USA Department of Pharmacology, University of Texas Health Science Center at San Antonio, TX, USA Department of Physiology, University of Texas Health Science Center at San Antonio, TX, USA
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16
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Dose-depending effect of intracerebroventricularly administered bradykinin on nociception in rats. Pharmacol Rep 2014; 65:1006-11. [PMID: 24145095 DOI: 10.1016/s1734-1140(13)71082-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2012] [Revised: 04/23/2013] [Indexed: 01/07/2023]
Abstract
BACKGROUND The effect of small and high doses of intracerebroventricularly (icv) applied bradykinin (BK) on nociception produced by mechanical stimuli and the participation of B1 and B2 receptors in this nociception were investigated in rats. RESULTS BK at the lowest dose (0.06 μg) produced hyperalgesia whereas at the higher doses (6 and 12 μg) antinociception. This effect was abolished by B1 or B2 receptor antagonists, des-Arg(10)-HOE140 and HOE140 (1 pmol icv), respectively. CONCLUSION Depending on the dose used, BK produces pro- or anti-nociceptive action. Both B1 and B2 receptors are involved in the action of icv applied BK.
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17
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Coelho S, Bastos-Pereira A, Fraga D, Chichorro J, Zampronio A. Etanercept reduces thermal and mechanical orofacial hyperalgesia following inflammation and neuropathic injury. Eur J Pain 2014; 18:957-67. [DOI: 10.1002/j.1532-2149.2013.00441.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/22/2013] [Indexed: 12/31/2022]
Affiliation(s)
- S.C. Coelho
- Department of Pharmacology; Federal University of Paraná; Curitiba Brazil
| | | | - D. Fraga
- Department of Pharmacology; Federal University of Paraná; Curitiba Brazil
| | - J.G. Chichorro
- Department of Pharmacology; Federal University of Paraná; Curitiba Brazil
| | - A.R. Zampronio
- Department of Pharmacology; Federal University of Paraná; Curitiba Brazil
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18
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Petho G, Reeh PW. Sensory and signaling mechanisms of bradykinin, eicosanoids, platelet-activating factor, and nitric oxide in peripheral nociceptors. Physiol Rev 2013; 92:1699-775. [PMID: 23073630 DOI: 10.1152/physrev.00048.2010] [Citation(s) in RCA: 191] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Peripheral mediators can contribute to the development and maintenance of inflammatory and neuropathic pain and its concomitants (hyperalgesia and allodynia) via two mechanisms. Activation or excitation by these substances of nociceptive nerve endings or fibers implicates generation of action potentials which then travel to the central nervous system and may induce pain sensation. Sensitization of nociceptors refers to their increased responsiveness to either thermal, mechanical, or chemical stimuli that may be translated to corresponding hyperalgesias. This review aims to give an account of the excitatory and sensitizing actions of inflammatory mediators including bradykinin, prostaglandins, thromboxanes, leukotrienes, platelet-activating factor, and nitric oxide on nociceptive primary afferent neurons. Manifestations, receptor molecules, and intracellular signaling mechanisms of the effects of these mediators are discussed in detail. With regard to signaling, most data reported have been obtained from transfected nonneuronal cells and somata of cultured sensory neurons as these structures are more accessible to direct study of sensory and signal transduction. The peripheral processes of sensory neurons, where painful stimuli actually affect the nociceptors in vivo, show marked differences with respect to biophysics, ultrastructure, and equipment with receptors and ion channels compared with cellular models. Therefore, an effort was made to highlight signaling mechanisms for which supporting data from molecular, cellular, and behavioral models are consistent with findings that reflect properties of peripheral nociceptive nerve endings. Identified molecular elements of these signaling pathways may serve as validated targets for development of novel types of analgesic drugs.
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Affiliation(s)
- Gábor Petho
- Pharmacodynamics Unit, Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Pécs, Pécs, Hungary
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19
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Ma F, Zhang L, Lyons D, Westlund KN. Orofacial neuropathic pain mouse model induced by Trigeminal Inflammatory Compression (TIC) of the infraorbital nerve. Mol Brain 2012; 5:44. [PMID: 23270529 PMCID: PMC3563613 DOI: 10.1186/1756-6606-5-44] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Accepted: 12/19/2012] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Trigeminal neuropathic pain attacks can be excruciating for patients, even after being lightly touched. Although there are rodent trigeminal nerve research models to study orofacial pain, few models have been applied to studies in mice. A mouse trigeminal inflammatory compression (TIC) model is introduced here which successfully and reliably promotes vibrissal whisker pad hypersensitivity. RESULTS The chronic orofacial neuropathic pain model is induced after surgical placement of chromic gut suture in the infraorbital nerve fissure in the maxillary bone. Slight compression and chemical effects of the chromic gut suture on the portion of the infraorbital nerve contacted cause mild nerve trauma. Nerve edema is observed in the contacting infraorbital nerve bundle as well as macrophage infiltration in the trigeminal ganglia. Centrally in the spinal trigeminal nucleus, increased immunoreactivity for an activated microglial marker is evident (OX42, postoperative day 70). Mechanical thresholds of the affected whisker pad are significantly decreased on day 3 after chromic gut suture placement, persisting at least 10 weeks. The mechanical allodynia is reversed by suppression of microglial activation. Cold allodynia was detected at 4 weeks. CONCLUSIONS A simple, effective, and reproducible chronic mouse model mimicking clinical orofacial neuropathic pain (Type 2) is induced by placing chromic gut suture between the infraorbital nerve and the maxillary bone. The method produces mild inflammatory compression with significant continuous mechanical allodynia persisting at least 10 weeks and cold allodynia measureable at 4 weeks.
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Affiliation(s)
- Fei Ma
- Department of Physiology MS-508, College of Medicine, University of Kentucky, Lexington, KY 40536-0298, USA
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20
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Krzyzanowska A, Avendaño C. Behavioral testing in rodent models of orofacial neuropathic and inflammatory pain. Brain Behav 2012; 2:678-97. [PMID: 23139912 PMCID: PMC3489819 DOI: 10.1002/brb3.85] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2012] [Revised: 07/10/2012] [Accepted: 07/13/2012] [Indexed: 11/12/2022] Open
Abstract
Orofacial pain conditions are often very debilitating to the patient and difficult to treat. While clinical interest is high, the proportion of studies performed in the orofacial region in laboratory animals is relatively low, compared with other body regions. This is partly due to difficulties in testing freely moving animals and therefore lack of reliable testing methods. Here we present a comprehensive review of the currently used rodent models of inflammatory and neuropathic pain adapted to the orofacial areas, taking into account the difficulties and drawbacks of the existing approaches. We examine the available testing methods and procedures used for assessing the behavioral responses in the face in both mice and rats and provide a summary of some pharmacological agents used in these paradigms to date. The use of these agents in animal models is also compared with outcomes observed in the clinic.
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Affiliation(s)
- Agnieszka Krzyzanowska
- Department of Anatomy, Histology and Neuroscience, Autonoma University of Madrid, Medical School Madrid, Spain
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21
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Emerging role of microglial kinin B1 receptor in diabetic pain neuropathy. Exp Neurol 2012; 234:373-81. [DOI: 10.1016/j.expneurol.2011.11.032] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Revised: 11/01/2011] [Accepted: 11/22/2011] [Indexed: 12/28/2022]
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Krzyzanowska A, Pittolo S, Cabrerizo M, Sánchez-López J, Krishnasamy S, Venero C, Avendaño C. Assessing nociceptive sensitivity in mouse models of inflammatory and neuropathic trigeminal pain. J Neurosci Methods 2011; 201:46-54. [PMID: 21782847 DOI: 10.1016/j.jneumeth.2011.07.006] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2011] [Revised: 07/01/2011] [Accepted: 07/08/2011] [Indexed: 12/31/2022]
Abstract
Chronic orofacial pain encompasses a range of debilitating conditions, however in contrast to other body regions, few animal models are available to investigate mechanisms and treatments in the trigeminal area. Particularly, there is a lack of reliable models and testing methods in mice. We have behaviourally tested C57BL/6 mice subjected to unilateral chronic constriction injury (CCI) of the infraorbital nerve (IoN) or unilateral injections of Complete Freunds Adjuvant (CFA) into the vibrissal pad region with the aid of von Frey filaments and air-puffs and the use of a newly designed restraining device. These models were validated by suppressing the pain responses with appropriate drugs. The IoN-CCI group showed significant hyperalgesia on the ipsilateral side in comparison to baseline values for up to 20 days post-CCI following von Frey and air-puff stimulation. Gabapentin (60mg/kg), but not saline, temporarily reversed the hyperalgesia. Animals that received a CFA injection showed hyperresponsivity to both von Frey and air-puff stimulation for up to 4 days post injection. These effects were transiently reversed with 3mg/kg i.p. morphine but not saline. Our study proposes a new restraining device for mice, and validates a behavioural testing procedure of several facial pain models in mice, allowing for reproducible and robust assessment of the effects of pain-related agents and treatments, or phenotyping of genetically modified animals.
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Affiliation(s)
- Agnieszka Krzyzanowska
- Department of Anatomy, Histology & Neuroscience, Autonoma University of Madrid, Medical School, 28029 Madrid, Spain.
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Physiological mechanisms of neuropathic pain: the orofacial region. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2011; 97:227-50. [PMID: 21708313 DOI: 10.1016/b978-0-12-385198-7.00009-6] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Neuropathic pain in the orofacial region is the clinical manifestation of trigeminal nerve injury following oral surgeries such as tooth extraction, dental implantation or tooth pulp treatment. Normally non-noxious touching of the facial skin or oral mucosa elicits strong pain named allodynia, and normally noxious stimulation causes intolerable pain named hyperalgesia in the trigeminal neuropathic pain patients. Although the mechanisms underlying trigeminal neuropathic pain have been studied by many researchers, the detailed mechanisms are still unknown. In this chapter, we are focusing on trigeminal neuropathic pain, and describe our recent studies using animal models of trigeminal neuropathic pain. We also present the clinical assessment of trigeminal neuropathic pain patients to develop the appropriate treatment of trigeminal neuropathic pain.
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Schmid D, Messlinger K, Belmonte C, Fischer MJM. Altered thermal sensitivity in neurons injured by infraorbital nerve lesion. Neurosci Lett 2010; 488:168-72. [PMID: 21078368 DOI: 10.1016/j.neulet.2010.11.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2010] [Revised: 10/28/2010] [Accepted: 11/04/2010] [Indexed: 10/18/2022]
Abstract
Nerve lesions are common injuries. While peripheral sensitivity is lost, the partially regenerating nerve undergoes a complex transformation, occasionally leading to persistent pain syndromes. Changes of thermal perception following nerve injury have received little attention. This study investigates the sensitivity of trigeminal neurons after infraorbital nerve lesion in guinea-pigs. Cultured trigeminal neurons innervating the area of denervation were identified by retrograde transport of DiI deposited at the site of the lesion. The standardized protocol consisted of cold and heat stimulation starting from body temperature as well as application of menthol and capsaicin, while activation was quantified by Fura-2-based calcium microfluorimetry. Compared to neurons from control animals, DiI-positive neurons were similar in the percentage and extend of the responses to menthol and capsaicin. However, DiI-positive neurons were less responsive to cold stimulation and had a lower cold threshold when compared to DiI-negative or control neurons. At the same time, DiI-positive neurons were more responsive to heat stimulation and had a lower heat threshold compared to control neurons. In summary, the percentage of trigeminal neurons responsive to thermal or chemical stimulation did not change after axotomy. However, thermal sensitivity of these neurons was altered.
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Affiliation(s)
- Damaris Schmid
- Instituto de Neurociencias de Alicante, Universidad Miguel Hernández-CSIC, Spain
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