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Tian SX, Xu T, Shi RY, Cai YQ, Wu MH, Zhen SJ, Wang W, Zhou Y, Du JY, Fang JF, Shao XM, Liu BY, Jiang YL, He XF, Fang JQ, Liang Y. Analgesic effect of electroacupuncture on bone cancer pain in rat model: the role of peripheral P2X3 receptor. Purinergic Signal 2023; 19:13-27. [PMID: 35478452 PMCID: PMC9984641 DOI: 10.1007/s11302-022-09861-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Accepted: 03/28/2022] [Indexed: 11/25/2022] Open
Abstract
Upregulation of P2X3 receptor (P2X3R) has been strongly implicated in nociceptive signaling including bone cancer pain (BCP). The present study, using rat bone cancer model, aimed to explore the role of P2X3R in regulating rat pain behavior under the intervention of electroacupuncture (EA). The BCP model was successfully established by injection with MRMT-1 breast cancer cell into the medullary cavity of left tibia for 3 × 104 cells/3 μL PBS in rats as revealed by obvious bone destruction, decreased paw withdrawal thresholds (PWTs), and reduced paw withdrawal latencies (PWLs). Western blot analyses showed that P2X3R expression was significantly upregulated in ipsilateral lumbar 4-6 (L4-6) dorsal root ganglia (DRG), but the difference not seen in spinal cord dorsal horn (SCDH). With the in-depth study of P2X3R activation, we observed that intrathecal injection of P2X3R agonist α,β-meATP aggravated MRMT-1 induced BCP, while injection of P2X3R inhibitor A-317491 alleviated pain. Subsequently, we demonstrated that BCP induced mechanical allodynia and thermal hyperalgesia were attenuated after EA treatment. Under EA treatment, total P2X3R protein expression in ipsilateral DRGs was decreased, and it is worth mentioning that decreased expression of P2X3R membrane protein, which indicated that both the expression and membrane trafficking of P2X3R were inhibited by EA. The immunofluorescence assay showed that EA stimulation exerted functions by reducing the expression of P2X3R-positive cells in ipsilateral DRGs of BCP rats. Ca2+ imaging analysis revealed that the EA stimulation decreased the percentage of α,β-meATP responsive neurons in DRGs and inhibited calcium influx. Notably, the inhibitory effect of EA on mechanical allodynia and nociceptive flinches was abolished by intrathecal injection of α,β-meATP. These findings demonstrated EA stimulation ameliorated mechanical allodynia and thermal hyperalgesia in rat model of MRMT-1-induced BCP. EA exerts analgesic effect on BCP by reducing the overexpression and functional activity of P2X3R in ipsilateral DRGs of BCP rats. Our work first demonstrates the critical and overall role of P2X3R in EA's analgesia against peripheral sensitization of MRMT-1-induced BCP and further supports EA as a potential therapeutic option for cancer pain in clinic.
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Affiliation(s)
- Shu-Xin Tian
- Department of Neurobiology and Acupuncture Research, The Third School of Clinical Medicine, Key Laboratory of Acupuncture and Neurology of Zhejiang Province, Zhejiang Chinese Medical University, 548 Binwen Road, Binjiang District, Hangzhou, 310053, Zhejiang Province, China
| | - Ting Xu
- Department of Neurobiology and Acupuncture Research, The Third School of Clinical Medicine, Key Laboratory of Acupuncture and Neurology of Zhejiang Province, Zhejiang Chinese Medical University, 548 Binwen Road, Binjiang District, Hangzhou, 310053, Zhejiang Province, China
| | - Ren-Yi Shi
- Department of Acupuncture and Moxibustion, Sanya Traditional Chinese Medicine Hospital, Sanya, 572000, China
| | - Yang-Qian Cai
- Department of Neurobiology and Acupuncture Research, The Third School of Clinical Medicine, Key Laboratory of Acupuncture and Neurology of Zhejiang Province, Zhejiang Chinese Medical University, 548 Binwen Road, Binjiang District, Hangzhou, 310053, Zhejiang Province, China
| | - Ming-Hui Wu
- Department of Neurobiology and Acupuncture Research, The Third School of Clinical Medicine, Key Laboratory of Acupuncture and Neurology of Zhejiang Province, Zhejiang Chinese Medical University, 548 Binwen Road, Binjiang District, Hangzhou, 310053, Zhejiang Province, China
| | - Si-Jia Zhen
- Department of Neurobiology and Acupuncture Research, The Third School of Clinical Medicine, Key Laboratory of Acupuncture and Neurology of Zhejiang Province, Zhejiang Chinese Medical University, 548 Binwen Road, Binjiang District, Hangzhou, 310053, Zhejiang Province, China
| | - Wen Wang
- Department of Neurobiology and Acupuncture Research, The Third School of Clinical Medicine, Key Laboratory of Acupuncture and Neurology of Zhejiang Province, Zhejiang Chinese Medical University, 548 Binwen Road, Binjiang District, Hangzhou, 310053, Zhejiang Province, China
| | - You Zhou
- Department of Neurobiology and Acupuncture Research, The Third School of Clinical Medicine, Key Laboratory of Acupuncture and Neurology of Zhejiang Province, Zhejiang Chinese Medical University, 548 Binwen Road, Binjiang District, Hangzhou, 310053, Zhejiang Province, China
| | - Jun-Ying Du
- Department of Neurobiology and Acupuncture Research, The Third School of Clinical Medicine, Key Laboratory of Acupuncture and Neurology of Zhejiang Province, Zhejiang Chinese Medical University, 548 Binwen Road, Binjiang District, Hangzhou, 310053, Zhejiang Province, China
| | - Jun-Fan Fang
- Department of Neurobiology and Acupuncture Research, The Third School of Clinical Medicine, Key Laboratory of Acupuncture and Neurology of Zhejiang Province, Zhejiang Chinese Medical University, 548 Binwen Road, Binjiang District, Hangzhou, 310053, Zhejiang Province, China
| | - Xiao-Mei Shao
- Department of Neurobiology and Acupuncture Research, The Third School of Clinical Medicine, Key Laboratory of Acupuncture and Neurology of Zhejiang Province, Zhejiang Chinese Medical University, 548 Binwen Road, Binjiang District, Hangzhou, 310053, Zhejiang Province, China
| | - Bo-Yi Liu
- Department of Neurobiology and Acupuncture Research, The Third School of Clinical Medicine, Key Laboratory of Acupuncture and Neurology of Zhejiang Province, Zhejiang Chinese Medical University, 548 Binwen Road, Binjiang District, Hangzhou, 310053, Zhejiang Province, China
| | - Yong-Liang Jiang
- Department of Neurobiology and Acupuncture Research, The Third School of Clinical Medicine, Key Laboratory of Acupuncture and Neurology of Zhejiang Province, Zhejiang Chinese Medical University, 548 Binwen Road, Binjiang District, Hangzhou, 310053, Zhejiang Province, China
| | - Xiao-Fen He
- Department of Neurobiology and Acupuncture Research, The Third School of Clinical Medicine, Key Laboratory of Acupuncture and Neurology of Zhejiang Province, Zhejiang Chinese Medical University, 548 Binwen Road, Binjiang District, Hangzhou, 310053, Zhejiang Province, China
| | - Jian-Qiao Fang
- Department of Neurobiology and Acupuncture Research, The Third School of Clinical Medicine, Key Laboratory of Acupuncture and Neurology of Zhejiang Province, Zhejiang Chinese Medical University, 548 Binwen Road, Binjiang District, Hangzhou, 310053, Zhejiang Province, China.,Department of Acupuncture and Moxibustion, The Third Affiliated Hospital of Zhejiang, Chinese Medical University, Hangzhou, 310005, China
| | - Yi Liang
- Department of Neurobiology and Acupuncture Research, The Third School of Clinical Medicine, Key Laboratory of Acupuncture and Neurology of Zhejiang Province, Zhejiang Chinese Medical University, 548 Binwen Road, Binjiang District, Hangzhou, 310053, Zhejiang Province, China. .,Department of Acupuncture and Moxibustion, The Third Affiliated Hospital of Zhejiang, Chinese Medical University, Hangzhou, 310005, China.
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Uniyal A, Thakur V, Rani M, Tiwari V, Akhilesh, Gadepalli A, Ummadisetty O, Modi A, Tiwari V. Kinesin Nanomotors Mediated Trafficking of NMDA-Loaded Cargo as A Novel Target in Chronic Pain. ACS Chem Neurosci 2021; 12:2956-2963. [PMID: 34324307 DOI: 10.1021/acschemneuro.1c00319] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Chronic pain is among the most prevalent burdensome disorders worldwide. The N-methyl-d-aspartate (NMDA) receptor system plays a critical role in central sensitization, a primary feature of chronic pain. Despite the proven efficacy of exogenous ligands to this receptor system in preclinical studies, evidence for the clinical efficacy of NMDA antagonists for the treatment of chronic pain is weak. Researchers are studying alternate approaches, rather than direct inhibition of the NMDA receptors in pain processing neurons. This indirect approach utilizes the modulation of molecular switches that regulates the synthesis, maturation, and transport of receptors from cellular organelles to the synaptic membrane. Kinesins are nanomotors that anterogradely transport the cargo using microtubule tracks across the neurons. Various members of the kinesin family, including KIF17, KIF11, KIF5b, and KIF21a, regulate the intracellular transport of NMDA receptors. Pharmacological targeting of these ATP-driven nanomotors could be a useful tool for manipulating the NMDAR functioning. It could provide the potential for the development of a novel strategy for the management of chronic pain.
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Affiliation(s)
- Ankit Uniyal
- Neuroscience and Pain Research Laboratory, Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology B.H.U., Varanasi 221005, India
| | - Vaibhav Thakur
- Neuroscience and Pain Research Laboratory, Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology B.H.U., Varanasi 221005, India
| | - Mousmi Rani
- Neuroscience and Pain Research Laboratory, Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology B.H.U., Varanasi 221005, India
| | - Vineeta Tiwari
- Neuroscience and Pain Research Laboratory, Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology B.H.U., Varanasi 221005, India
| | - Akhilesh
- Neuroscience and Pain Research Laboratory, Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology B.H.U., Varanasi 221005, India
| | - Anagha Gadepalli
- Neuroscience and Pain Research Laboratory, Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology B.H.U., Varanasi 221005, India
| | - Obulapathi Ummadisetty
- Neuroscience and Pain Research Laboratory, Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology B.H.U., Varanasi 221005, India
| | - Ajay Modi
- Neuroscience and Pain Research Laboratory, Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology B.H.U., Varanasi 221005, India
| | - Vinod Tiwari
- Neuroscience and Pain Research Laboratory, Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology B.H.U., Varanasi 221005, India
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Sun L, Wang G, He M, Mei Z, Zhang F, Liu P. Effect and mechanism of the CACNA2D1-CGRP pathway in osteoarthritis-induced ongoing pain. Biomed Pharmacother 2020; 129:110374. [PMID: 32570114 DOI: 10.1016/j.biopha.2020.110374] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Revised: 06/04/2020] [Accepted: 06/07/2020] [Indexed: 12/27/2022] Open
Abstract
This study built an OA model in rats by monosodium iodoacetate (MIA) injection to determine the effects and mechanism of the voltage-dependent calcium channel subunit alpha-2/delta-1 (CACNA2D1)-calcitonin gene-related protein (CGRP) pathway in osteoarthritis (OA)-induced ongoing pain. CACNA2D1 expression was measured by qPCR assay, western blotting assay, and immunofluorescence. Pain behaviors in rats were assessed with the measurement of thermal paw withdrawal latency (PWL) and mechanical paw withdrawal threshold (PWT). The expression of CACNA2D1, neuropeptide Y (NPY), activating transcription factor 3 (ATF3), CGRP, protein kinase A (PKA), phosphorylated (p)-PKA, adenylyl cyclase (AC), protein kinase C (PKC), p-PKC, phospholipase C (PLC), and mitogen-activated protein kinase (MAPK) signaling pathway proteins were measured, OA rats had higher CACNA2D1 expression than normal rats. Knockdown of CACNA2D1 led to the elevation of the pain threshold of OA rats, and CACNA2D1 over-expression decreased the pain threshold of normal rats. Moreover, CACNA2D1 over-expression inhibited the expression of CGRP, up-regulated the expressions of NPY, ATF3, p-PKA, AC, p-PKC, PLC, p-Jun N-terminal kinase (JNK), and p-p38, and had no significant effect on phosphorylated extracellular signal-regulated kinase (p-ERK) expression in vivo and in vitro. Using this model of MIA-induced OA, we demonstrated that CACNA2D1 might be involved in the process of pain by modulating the CGRP and AC-PKA/PKC/MAPK signaling pathways in the dorsal root ganglion.
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Affiliation(s)
- Liang Sun
- Department of Urology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, 250021, China
| | - Guodong Wang
- Departments of Orthopaedics, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, 250021, China
| | - Meifang He
- Laboratory of General Surgery, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Zhigang Mei
- Guangzhou Sihe Biotechnology Co., Ltd., Guangzhou, China
| | - Fazhou Zhang
- Guangzhou Sihe Biotechnology Co., Ltd., Guangzhou, China
| | - Ping Liu
- Department of Pharmacy, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, 250021, China; Department of Pharmacy, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong, 250021, China.
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4
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Benitez SG, Seltzer AM, Messina DN, Foscolo MR, Patterson SI, Acosta CG. Cutaneous inflammation differentially regulates the expression and function of Angiotensin-II types 1 and 2 receptors in rat primary sensory neurons. J Neurochem 2019; 152:675-696. [PMID: 31386177 DOI: 10.1111/jnc.14848] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 06/25/2019] [Accepted: 07/31/2019] [Indexed: 12/14/2022]
Abstract
Neuropathic and inflammatory pain results from cellular and molecular changes in dorsal root ganglion (DRG) neurons. The type-2 receptor for Angiotensin-II (AT2R) has been involved in this type of pain. However, the underlying mechanisms are poorly understood, including the role of the type-1 receptor for Angiotensin-II (AT1R). Here, we used a combination of immunohistochemistry and immunocytochemistry, RT-PCR and in vitro and in vivo pharmacological manipulation to examine how cutaneous inflammation affected the expression of AT1R and AT2R in subpopulations of rat DRG neurons and studied their impact on inflammation-induced neuritogenesis. We demonstrated that AT2R-neurons express C- or A-neuron markers, primarily IB4, trkA, and substance-P. AT1R expression was highest in small neurons and co-localized significantly with AT2R. In vitro, an inflammatory soup caused significant elevation of AT2R mRNA, whereas AT1R mRNA levels remained unchanged. In vivo, we found a unique pattern of change in the expression of AT1R and AT2R after cutaneous inflammation. AT2R increased in small neurons at 1 day and in medium size neurons at 4 days. Interestingly, cutaneous inflammation increased AT1R levels only in large neurons at 4 days. We found that in vitro and in vivo AT1R and AT2R acted co-operatively to regulate DRG neurite outgrowth. In vivo, AT2R inhibition impacted more on non-peptidergic C-neurons neuritogenesis, whereas AT1R blockade affected primarily peptidergic nerve terminals. Thus, cutaneous-induced inflammation regulated AT1R and AT2R expression and function in different DRG neuronal subpopulations at different times. These findings must be considered when targeting AT1R and AT2R to treat chronic inflammatory pain. Cover Image for this issue: doi: 10.1111/jnc.14737.
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Affiliation(s)
- Sergio G Benitez
- Laboratorio de Neurobiología del Dolor, Instituto de Histología y Embriología de Mendoza (IHEM-CONICET), Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Mendoza, Argentina
| | - Alicia M Seltzer
- Laboratorio de Neurobiología, Instituto de Embriología e Histología (IHEM-CONICET), Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Mendoza, Argentina
| | - Diego N Messina
- Laboratorio de Neurobiología del Dolor, Instituto de Histología y Embriología de Mendoza (IHEM-CONICET), Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Mendoza, Argentina
| | - Mabel R Foscolo
- Laboratorio de Neurobiología del Dolor, Instituto de Histología y Embriología de Mendoza (IHEM-CONICET), Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Mendoza, Argentina
| | - Sean I Patterson
- Departamento de Morfofisiología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Mendoza, Argentina.,Instituto de Histología y Embriología - CONICET, Universidad Nacional de Cuyo, Mendoza, Argentina
| | - Cristian G Acosta
- Laboratorio de Neurobiología del Dolor, Instituto de Histología y Embriología de Mendoza (IHEM-CONICET), Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Mendoza, Argentina
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Bäurle S, Nagel J, Peters O, Bräuer N, ter Laak A, Preusse C, Rottmann A, Heldmann D, Bothe U, Blume T, Zorn L, Walter D, Zollner TM, Steinmeyer A, Langer G. Identification of a Benzimidazolecarboxylic Acid Derivative (BAY 1316957) as a Potent and Selective Human Prostaglandin E2 Receptor Subtype 4 (hEP4-R) Antagonist for the Treatment of Endometriosis. J Med Chem 2019; 62:2541-2563. [DOI: 10.1021/acs.jmedchem.8b01862] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Stefan Bäurle
- Bayer AG, Research & Development, Pharmaceuticals, Müllerstrasse 178, 13353 Berlin, Germany
| | - Jens Nagel
- Bayer AG, Research & Development, Pharmaceuticals, Müllerstrasse 178, 13353 Berlin, Germany
| | - Olaf Peters
- Bayer AG, Research & Development, Pharmaceuticals, Müllerstrasse 178, 13353 Berlin, Germany
| | - Nico Bräuer
- Bayer AG, Research & Development, Pharmaceuticals, Müllerstrasse 178, 13353 Berlin, Germany
| | - Antonius ter Laak
- Bayer AG, Research & Development, Pharmaceuticals, Müllerstrasse 178, 13353 Berlin, Germany
| | - Cornelia Preusse
- Bayer AG, Research & Development, Pharmaceuticals, Müllerstrasse 178, 13353 Berlin, Germany
| | - Antje Rottmann
- Bayer AG, Research & Development, Pharmaceuticals, Müllerstrasse 178, 13353 Berlin, Germany
| | - Dieter Heldmann
- Bayer AG, Research & Development, Pharmaceuticals, Müllerstrasse 178, 13353 Berlin, Germany
| | - Ulrich Bothe
- Bayer AG, Research & Development, Pharmaceuticals, Müllerstrasse 178, 13353 Berlin, Germany
| | - Thorsten Blume
- Bayer AG, Research & Development, Pharmaceuticals, Müllerstrasse 178, 13353 Berlin, Germany
| | - Ludwig Zorn
- Bayer AG, Research & Development, Pharmaceuticals, Müllerstrasse 178, 13353 Berlin, Germany
| | - Daryl Walter
- Evotec (UK) Ltd., 112-114 Innovation Drive, Milton Park, Abingdon, Oxfordshire OX14 4RZ, U.K
| | - Thomas M. Zollner
- Bayer AG, Research & Development, Pharmaceuticals, Müllerstrasse 178, 13353 Berlin, Germany
| | - Andreas Steinmeyer
- Bayer AG, Research & Development, Pharmaceuticals, Müllerstrasse 178, 13353 Berlin, Germany
| | - Gernot Langer
- Bayer AG, Research & Development, Pharmaceuticals, Müllerstrasse 178, 13353 Berlin, Germany
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Ma W, St-Jacques B. Signalling transduction events involved in agonist-induced PGE2/EP4 receptor externalization in cultured rat dorsal root ganglion neurons. Eur J Pain 2018; 22:845-861. [PMID: 29336505 DOI: 10.1002/ejp.1172] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/08/2017] [Indexed: 12/21/2022]
Abstract
BACKGROUND Prostaglandin E2 (PGE2) enriched in inflamed tissues contributes to chronic pain by sensitizing nociceptive dorsal root ganglion (DRG) neurons (nociceptors). Of four PGE2 receptors (EP1-4), EP4 plays a major role in PGE2-induced nociceptor sensitization. We have previously reported that PGE2 or EP4 agonists stimulated EP4 externalization in cultured DRG neurons and this event contributes to nociceptor sensitization. However, the signalling transduction events governing this event remain unknown. METHODS In this study, using antibody-based externalization assay, we examined EP subtypes and multiple signalling transduction events involved in PGE2-induced EP4 externalization in cultured DRG neurons. RESULTS In addition to EP4 agonist, EP2 agonist, to a lesser extent, also induced EP4 externalization while EP1 and EP3 agonists had no effect. The extracellular and intracellular calcium chelators, the inhibitors of CaMKII, cAMP, PKA, PKC, PKCε, PLC, MAPKs, PI3K and Akt suppressed agonist-induced EP4 externalization. The activator of AC, two PKA-specific cAMP analogues and one Epac-specific cAMP analogue also induced EP4 externalization. ELISA showed that double sequential exposures to EP4 agonists induced a greater release of pain peptide CGRP from cultured DRG neurons than a single exposure, an event blocked by the inhibitor of anterograde transport from ER/Golgi complex to cell surface. CONCLUSIONS Taken together, these data suggest that mobilization of extracellular and intracellular calcium as well as the activation of CaMKII, cAMP/PKA, cAMP/Epac, PKC/PKCε, MAPKs, PI3K-Akt and PLC signalling transduction pathways are involved in agonist-induced EP4 externalization. Agonist-enhanced EP4 externalization increases EP4 cell surface abundance and activity, thus enhancing nociceptor sensitization. SIGNIFICANCE This study adds mechanistic information regarding signalling transduction events involved in agonist-induced EP4 cell surface trafficking. EP4 and EP2 (to lesser extent) receptors, extra- and intracellular Ca++ , CaKMII, cAMP, PKA, PKC, PKCε, PLC, MAPK, PI3K and Akt are involved in this event. Agonist-induced EP4 externalization contributes to enhanced nociceptor sensitization.
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Affiliation(s)
- W Ma
- Douglas Mental Health University Institute, McGill University, Montréal, Canada.,Department of Psychiatry, McGill University, Montréal, Canada
| | - B St-Jacques
- Douglas Mental Health University Institute, McGill University, Montréal, Canada
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Abstract
Chronic neuropathic pain is a widespread problem with negative personal and societal consequences. Despite considerable clinical neuroscience research, the goal of developing effective, reliable, and durable treatments has remained elusive. The critical role played by the dorsal root ganglion (DRG) in the induction and maintenance of chronic pain has been largely overlooked in these efforts, however. It may be that, by targeting this site, robust new options for pain management will be revealed. This review summarizes recent advances in the knowledge base for DRG-targeted treatments for neuropathic pain:• Pharmacological options including the chemical targeting of voltage-dependent calcium channels, transient receptor potential channels, neurotrophin production, potentiation of opioid transduction pathways, and excitatory glutamate receptors.• Ablation or modulation of the DRG via continuous thermal radiofrequency and pulsed radiofrequency treatments.• Implanted electrical neurostimulator technologies.• Interventions involving the modification of DRG cellular function at the genetic level by using viral vectors and gene silencing methods.
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Cao S, Xiao Z, Sun M, Li Y. D-serine in the midbrain periaqueductal gray contributes to morphine tolerance in rats. Mol Pain 2016; 12:12/0/1744806916646786. [PMID: 27175014 PMCID: PMC4956000 DOI: 10.1177/1744806916646786] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2016] [Accepted: 04/04/2016] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND The N-methyl-D-aspartate subtype of glutamate receptor plays a critical role in morphine tolerance. D-serine, a co-agonist of N-methyl-D-aspartate receptor, participates in many physiological and pathophysiological processes via regulating N-methyl-D-aspartate receptor activation. The purinergic P2X7 receptor activation can induce the D-serine release in the central nervous system. This study aimed to investigate the role of the ventrolateral midbrain periaqueductal gray D-serine in the mechanism of morphine tolerance in rats. The development of morphine tolerance was induced in normal adult male Sprague-Dawley rats through subcutaneous injection of morphine (10 mg/kg). The analgesic effect of morphine (5 mg/kg, i.p.) was assessed by measuring mechanical withdrawal thresholds in rats with an electronic von Frey anesthesiometer. The D-serine concentration and serine racemase expression levels in the ventrolateral midbrain periaqueductal gray were evaluated through enzyme-linked immunosorbent assay and Western blot analysis, respectively. The effects of intra-ventrolateral midbrain periaqueductal gray injections of the D-serine degrading enzyme D-amino acid oxidase and antisense oligodeoxynucleotide targeting the P2X7 receptor on chronic morphine-treated rats were also explored. RESULTS We found that repeated morphine administrations decreased the antinociceptive potency of morphine evidenced by the percent changes in mechanical pain threshold in rats. By contrast, the D-serine contents and the expression levels of the serine racemase protein were upregulated in the ventrolateral midbrain periaqueductal gray in morphine-tolerant rats. The development of morphine tolerance was markedly alleviated by intra-ventrolateral midbrain periaqueductal gray injections of D-amino acid oxidase or antisense oligodeoxynucleotide targeting the P2X7 receptor. CONCLUSIONS Our data indicate that the development of antinociceptive tolerance to morphine is partially mediated by ventrolateral midbrain periaqueductal gray D-serine content, and the activation of the ventrolateral midbrain periaqueductal gray P2X7 receptor is an essential prelude to D-serine release. These results suggest that a cascade involving P2X7 receptor-D-serine-N-methyl-D-aspartate receptor mediated signaling pathway in the supraspinal mechanism of morphine tolerance.
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Affiliation(s)
- Song Cao
- Department of Pain Medicine, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou, China Guizhou Key Laboratory of Anesthesia and Organ Protection, Zunyi Medical University, Zunyi, Guizhou, China
| | - Zhi Xiao
- Research Center for Medicine and Biology, Zunyi Medical University, Zunyi, Guizhou, China
| | - Mengjie Sun
- Graduate School, Zunyi Medical University, Zunyi, Guizhou, China
| | - Youyan Li
- Graduate School, Zunyi Medical University, Zunyi, Guizhou, China
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Tabakoff B, Ren W, Vanderlinden L, Snell LD, Matheson CJ, Wang ZJ, Levinson R, Smothers CT, Woodward JJ, Honse Y, Lovinger D, Rush AM, Sather WA, Gustafson DL, Hoffman PL. A novel substituted aminoquinoline selectively targets voltage-sensitive sodium channel isoforms and NMDA receptor subtypes and alleviates chronic inflammatory and neuropathic pain. Eur J Pharmacol 2016; 784:1-14. [PMID: 27158117 DOI: 10.1016/j.ejphar.2016.05.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Revised: 05/03/2016] [Accepted: 05/04/2016] [Indexed: 12/19/2022]
Abstract
Recent understanding of the systems that mediate complex disease states, has generated a search for molecules that simultaneously modulate more than one component of a pathologic pathway. Chronic pain syndromes are etiologically connected to functional changes (sensitization) in both peripheral sensory neurons and in the central nervous system (CNS). These functional changes involve modifications of a significant number of components of signal generating, signal transducing and signal propagating pathways. Our analysis of disease-related changes which take place in sensory neurons during sensitization led to the design of a molecule that would simultaneously inhibit peripheral NMDA receptors and voltage sensitive sodium channels. In the current report, we detail the selectivity of N,N-(diphenyl)-4-ureido-5,7-dichloro-2-carboxy-quinoline (DCUKA) for action at NMDA receptors composed of different subunit combinations and voltage sensitive sodium channels having different α subunits. We show that DCUKA is restricted to the periphery after oral administration, and that circulating blood levels are compatible with its necessary concentrations for effects at the peripheral cognate receptors/channels that were assayed in vitro. Our results demonstrate that DCUKA, at concentrations circulating in the blood after oral administration, can modulate systems which are upregulated during peripheral sensitization, and are important for generating and conducting pain information to the CNS. Furthermore, we demonstrate that DCUKA ameliorates the hyperalgesia of chronic pain without affecting normal pain responses in neuropathic and inflammation-induced chronic pain models.
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Affiliation(s)
- Boris Tabakoff
- Lohocla Research Corporation, Colorado Bioscience Building, 12635 East Montview Blvd., Suite 128, Aurora, CO 80045, USA; Department of Pharmaceutical Sciences, Skaggs School of Pharmacy & Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Campus Box: C238 12850, E. Montview Blvd., Aurora, CO 80045, USA.
| | - Wenhua Ren
- Lohocla Research Corporation, Colorado Bioscience Building, 12635 East Montview Blvd., Suite 128, Aurora, CO 80045, USA.
| | - Lauren Vanderlinden
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy & Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Campus Box: C238 12850, E. Montview Blvd., Aurora, CO 80045, USA.
| | - Lawrence D Snell
- Lohocla Research Corporation, Colorado Bioscience Building, 12635 East Montview Blvd., Suite 128, Aurora, CO 80045, USA.
| | - Christopher J Matheson
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy & Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Campus Box: C238 12850, E. Montview Blvd., Aurora, CO 80045, USA.
| | - Ze-Jun Wang
- Department of Pharmacology, University of Colorado Anschutz Medical Campus, 12800 E. 19 Ave., Aurora, CO 80045 USA.
| | - Rock Levinson
- Department of Physiology & Biophysics, University of Colorado Anschutz Medical Campus, 12800 E. 19th Ave., Aurora, CO 80045, USA.
| | - C Thetford Smothers
- Department of Neurosciences and Department of Psychiatry, Medical University of South Carolina, 171 Ashley Ave., Charleston, SC 29425, USA.
| | - John J Woodward
- Department of Neurosciences and Department of Psychiatry, Medical University of South Carolina, 171 Ashley Ave., Charleston, SC 29425, USA.
| | - Yumiko Honse
- Clinical and Biological Research Unit, NIAAA, 12420 Parklawn Dr., MSC 8115, Bethesda, MD 20892-8115, USA.
| | - David Lovinger
- Clinical and Biological Research Unit, NIAAA, 12420 Parklawn Dr., MSC 8115, Bethesda, MD 20892-8115, USA.
| | | | - William A Sather
- Department of Pharmacology, University of Colorado Anschutz Medical Campus, 12800 E. 19 Ave., Aurora, CO 80045 USA.
| | - Daniel L Gustafson
- UCCC Pharmacology Shared Resource, Colorado State University, Veterinary Teaching Hospital, A CC246, 300 West Drake Road, Fort Collins, CO 80023, USA.
| | - Paula L Hoffman
- Department of Pharmacology, University of Colorado Anschutz Medical Campus, 12800 E. 19 Ave., Aurora, CO 80045 USA.
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10
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Wang W, Wang Y, Zhang W, Jin X, Liu Y, Xu S, Lei L, Shen X, Guo X, Xia X, Wang F. Opioid-induced redistribution of 6TM and 7TM μ opioid receptors: A hypothesized mechanistic facilitator model of opioid-induced hyperalgesia. Pharmacol Rep 2016; 68:686-91. [PMID: 27116700 DOI: 10.1016/j.pharep.2016.03.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Revised: 01/30/2016] [Accepted: 03/02/2016] [Indexed: 01/21/2023]
Abstract
Opioids are still the most popular form of pain treatment, but many unavoidable side effects make opioids a big challenge in effective pain management. Opioid-induced hyperalgesia (OIH), a paradoxical phenomenon, portrays an increased sensitivity to harmful stimuli caused by opioid exposure. Changes in the neural modulation are considered a major contributor to the development of OIH. Activation of opioid receptors (ORs) and corresponding downstream molecules are the vital composition of functional performance of opioids. Increasing interests were proposed of the interaction between ORs and other neural transmitter systems such as glutamatergic, GABAergic and adrenergic ones to the genesis of OIH. G protein coupled μ-opioid receptor (MOR) was studied comprehensively on its role in the development of OIH. In addition to the relationship between MOR and other neurotransmitter receptors, a new intracellular MOR that has six transmembrane (6TM) domains was identified, and found to perform a pro-nociceptive task in contrast to the counterpart 7TM isoform. A mechanistic model of OIH in which both 6TM and 7TM MORs undergoing membrane redistribution upon opioid exposure is proposed which eventually facilitates the neurons more sensitive to nociceptive stimulation than that of the preceding opioid exposure.
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Affiliation(s)
- Wei Wang
- Department of Anesthesiology, Nanjing Maternity and Child Health Care Hospital Affiliated to Nanjing Medical University, Nanjing, China
| | - Yan Wang
- Department of Anesthesiology, Affiliated Chaohu Hospital, Anhui Medical University, Chaohu, Anhui, China
| | - Wei Zhang
- Department of Anesthesiology, Nanjing T.C.M. Hospital, Nanjing, China
| | - Xiaoju Jin
- The First Affiliated Hospital of Wannan Medical College, Wuhu, Anhui, China
| | - Yusheng Liu
- Department of Anesthesiology, Nanjing Maternity and Child Health Care Hospital Affiliated to Nanjing Medical University, Nanjing, China
| | - Shiqin Xu
- Department of Anesthesiology, Nanjing Maternity and Child Health Care Hospital Affiliated to Nanjing Medical University, Nanjing, China
| | - Liming Lei
- Department of Anesthesiology, Nanjing Maternity and Child Health Care Hospital Affiliated to Nanjing Medical University, Nanjing, China
| | - Xiaofeng Shen
- Department of Anesthesiology, Nanjing Maternity and Child Health Care Hospital Affiliated to Nanjing Medical University, Nanjing, China
| | - Xirong Guo
- Pediatric Institute, Nanjing Maternity and Child Health Care Hospital Affiliated to Nanjing Medical University, Nanjing, China
| | - Xiaoqiong Xia
- Department of Anesthesiology, Affiliated Chaohu Hospital, Anhui Medical University, Chaohu, Anhui, China.
| | - Fuzhou Wang
- Department of Anesthesiology, Nanjing Maternity and Child Health Care Hospital Affiliated to Nanjing Medical University, Nanjing, China; Division of Neuroscience, The Bonoi Academy of Science and Education, Chapel Hill, NC, USA.
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11
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Marchenkova A, Vilotti S, Fabbretti E, Nistri A. Brain natriuretic peptide constitutively downregulates P2X3 receptors by controlling their phosphorylation state and membrane localization. Mol Pain 2015; 11:71. [PMID: 26576636 PMCID: PMC4650943 DOI: 10.1186/s12990-015-0074-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Accepted: 11/03/2015] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND ATP-gated P2X3 receptors are important transducers of nociceptive stimuli and are almost exclusively expressed by sensory ganglion neurons. In mouse trigeminal ganglion (TG), P2X3 receptor function is unexpectedly enhanced by pharmacological block of natriuretic peptide receptor-A (NPR-A), outlining a potential inhibitory role of endogenous natriuretic peptides in nociception mediated by P2X3 receptors. Lack of change in P2X3 protein expression indicates a complex modulation whose mechanisms for downregulating P2X3 receptor function remain unclear. RESULTS To clarify this process in mouse TG cultures, we suppressed NPR-A signaling with either siRNA of the endogenous agonist BNP, or the NPR-A blocker anantin. Thus, we investigated changes in P2X3 receptor distribution in the lipid raft membrane compartment, their phosphorylation state, as well as their function with patch clamping. Delayed onset of P2X3 desensitization was one mechanism for the anantin-induced enhancement of P2X3 activity. Anantin application caused preferential P2X3 receptor redistribution to the lipid raft compartment and decreased P2X3 serine phosphorylation, two phenomena that were not interdependent. An inhibitor of cGMP-dependent protein kinase and siRNA-mediated knockdown of BNP mimicked the effect of anantin. CONCLUSIONS We demonstrated that in mouse trigeminal neurons endogenous BNP acts on NPR-A receptors to determine constitutive depression of P2X3 receptor function. Tonic inhibition of P2X3 receptor activity by BNP/NPR-A/PKG pathways occurs via two distinct mechanisms: P2X3 serine phosphorylation and receptor redistribution to non-raft membrane compartments. This novel mechanism of receptor control might be a target for future studies aiming at decreasing dysregulated P2X3 receptor activity in chronic pain.
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Affiliation(s)
- Anna Marchenkova
- Neuroscience Department, International School for Advanced Studies (SISSA), Via Bonomea 265, 34136, Trieste, Italy.
| | - Sandra Vilotti
- Neuroscience Department, International School for Advanced Studies (SISSA), Via Bonomea 265, 34136, Trieste, Italy.
| | - Elsa Fabbretti
- Center for Biomedical Sciences and Engineering, University of Nova Gorica, 5000, Nova Gorica, Slovenia.
| | - Andrea Nistri
- Neuroscience Department, International School for Advanced Studies (SISSA), Via Bonomea 265, 34136, Trieste, Italy.
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12
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Current status and future directions of botulinum neurotoxins for targeting pain processing. Toxins (Basel) 2015; 7:4519-63. [PMID: 26556371 PMCID: PMC4663519 DOI: 10.3390/toxins7114519] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Revised: 09/29/2015] [Accepted: 10/19/2015] [Indexed: 12/20/2022] Open
Abstract
Current evidence suggests that botulinum neurotoxins (BoNTs) A1 and B1, given locally into peripheral tissues such as skin, muscles, and joints, alter nociceptive processing otherwise initiated by inflammation or nerve injury in animal models and humans. Recent data indicate that such locally delivered BoNTs exert not only local action on sensory afferent terminals but undergo transport to central afferent cell bodies (dorsal root ganglia) and spinal dorsal horn terminals, where they cleave SNAREs and block transmitter release. Increasing evidence supports the possibility of a trans-synaptic movement to alter postsynaptic function in neuronal and possibly non-neuronal (glial) cells. The vast majority of these studies have been conducted on BoNT/A1 and BoNT/B1, the only two pharmaceutically developed variants. However, now over 40 different subtypes of botulinum neurotoxins (BoNTs) have been identified. By combining our existing and rapidly growing understanding of BoNT/A1 and /B1 in altering nociceptive processing with explorations of the specific characteristics of the various toxins from this family, we may be able to discover or design novel, effective, and long-lasting pain therapeutics. This review will focus on our current understanding of the molecular mechanisms whereby BoNTs alter pain processing, and future directions in the development of these agents as pain therapeutics.
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13
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Abstract
Acid-sensing ion channels (ASICs) are proton-gated cation channels that are widely expressed in both the peripheral and central nervous systems. ASICs contribute to a variety of pathophysiological conditions that involve tissue acidosis, such as ischemic stroke, epileptic seizures and multiple sclerosis. Although much progress has been made in researching the structure-function relationship and pharmacology of ASICs, little is known about the trafficking of ASICs and its contribution to ASIC function. The recent identification of the mechanism of membrane insertion and endocytosis of ASIC1a highlights the emerging role of ASIC trafficking in regulating its pathophysiological functions. In this review, we summarize the recent advances and discuss future directions on this topic.
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Affiliation(s)
- Wei-Zheng Zeng
- a Discipline of Neuroscience and Department of Anatomy; Histology and Embryology; Institute of Medical Sciences ; Shanghai Jiao Tong University School of Medicine ; Shanghai 200025 , P.R. China
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14
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Liu TY, Cheng Y, Qin XY, Yu LC. Pharmacologically inhibiting GluR2 internalization alleviates neuropathic pain. Neurosci Bull 2015; 31:611-6. [PMID: 26248656 DOI: 10.1007/s12264-015-1556-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Accepted: 05/19/2015] [Indexed: 11/25/2022] Open
Abstract
Neuropathic pain is of serious clinical concern and only about half of patients achieve partial relief with currently-available treatments, so it is critical to find new drugs for this condition. Recently, the cellsurface trafficking of pain-related receptors has been suggested as an important mechanism underlying persistent neuropathic pain. Here, we used the short peptide GluA2-3y, which specifically inhibits the GluA2-dependent endocytosis of α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors, and tested its anti-nociceptive effect in the periaqueductal grey (PAG) of intact rats and rats with neuropathic pain. Intra-PAG injection of 0.15, 1.5, 7.5, and 15 pmol of GluA2-3y induced dose-dependent increases in hindpaw withdrawal latencies to noxious thermal and mechanical stimuli in intact rats, suggesting that GluA2 cell-surface trafficking in the PAG is involved in pain modulation. Furthermore, GluA2-3y had much stronger anti-nociceptive effects in rats with neuropathic pain induced by sciatic nerve ligation. Interestingly, the intra-PAG injection of 15 pmol GluA2-3y had an analgesic effect similar to 10 μg (35 nmol) morphine in rats with neuropathic pain. Taken together, our results suggested that GluA2 trafficking in the PAG plays a critical role in pain modulation, and inhibiting GluA2 endocytosis with GluA2-3y has potent analgesic effects in rats with neuropathic pain. These findings strongly support the recent hypothesis that targeting receptor trafficking could be a new strategy for the treatment of neuropathic pain.
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Affiliation(s)
- Tao-Yan Liu
- Beijing Engineering Research Center of Food, Environment, and Health, Minzu University of China, Beijing, 100081, China
- College of Life and Environmental Sciences, Minzu University of China, Beijing, 100081, China
| | - Yong Cheng
- Laboratory of Neurobiology and State Key Laboratory of Biomembrane and Membrane Biotechnology, College of Life Sciences, Peking University, Beijing, 100871, China.
| | - Xiao-Yan Qin
- Beijing Engineering Research Center of Food, Environment, and Health, Minzu University of China, Beijing, 100081, China.
- College of Life and Environmental Sciences, Minzu University of China, Beijing, 100081, China.
| | - Long-Chuan Yu
- Laboratory of Neurobiology and State Key Laboratory of Biomembrane and Membrane Biotechnology, College of Life Sciences, Peking University, Beijing, 100871, China
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15
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Alò R, Mele M, Avolio E, Fazzari G, Canonaco M. Distinct Amygdalar AMPAergic/GABAergic Mechanisms Promote Anxiolitic-Like Effects in an Unpredictable Stress Model of the Hamster. J Mol Neurosci 2014; 55:541-51. [DOI: 10.1007/s12031-014-0386-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Accepted: 07/14/2014] [Indexed: 01/16/2023]
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16
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Hagenston AM, Simonetti M. Neuronal calcium signaling in chronic pain. Cell Tissue Res 2014; 357:407-26. [PMID: 25012522 DOI: 10.1007/s00441-014-1942-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Accepted: 06/03/2014] [Indexed: 01/03/2023]
Abstract
Acute physiological pain, the unpleasant sensory response to a noxious stimulus, is essential for animals and humans to avoid potential injury. Pathological pain that persists after the original insult or injury has subsided, however, not only results in individual suffering but also imposes a significant cost on society. Improving treatments for long-lasting pathological pain requires a comprehensive understanding of the biological mechanisms underlying pain perception and the development of pain chronicity. In this review, we aim to highlight some of the major findings related to the involvement of neuronal calcium signaling in the processes that mediate chronic pain.
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Affiliation(s)
- Anna M Hagenston
- University of Heidelberg, Neurobiology, Im Neuenheimer Feld 364, 69120, Heidelberg, Germany,
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