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Network-Based Data Analysis Reveals Ion Channel-Related Gene Features in COVID-19: A Bioinformatic Approach. Biochem Genet 2022; 61:471-505. [PMID: 36104591 PMCID: PMC9473477 DOI: 10.1007/s10528-022-10280-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Accepted: 09/01/2022] [Indexed: 11/02/2022]
Abstract
Coronavirus disease 2019 (COVID-19) seriously threatens human health and has been disseminated worldwide. Although there are several treatments for COVID-19, its control is currently suboptimal. Therefore, the development of novel strategies to treat COVID-19 is necessary. Ion channels are located on the membranes of all excitable cells and many intracellular organelles and are key components involved in various biological processes. They are a target of interest when searching for drug targets. This study aimed to reveal the relevant molecular features of ion channel genes in COVID-19 based on bioinformatic analyses. The RNA-sequencing data of patients with COVID-19 and healthy subjects (GSE152418 and GSE171110 datasets) were obtained from the Gene Expression Omnibus (GEO) database. Ion channel genes were selected from the Hugo Gene Nomenclature Committee (HGNC) database. The RStudio software was used to process the data based on the corresponding R language package to identify ion channel-associated differentially expressed genes (DEGs). Based on the DEGs, Gene Ontology (GO) functional and pathway enrichment analyses were performed using the Enrichr web tool. The STRING database was used to generate a protein-protein interaction (PPI) network, and the Cytoscape software was used to screen for hub genes in the PPI network based on the cytoHubba plug-in. Transcription factors (TF)-DEG, DEG-microRNA (miRNA) and DEG-disease association networks were constructed using the NetworkAnalyst web tool. Finally, the screened hub genes as drug targets were subjected to enrichment analysis based on the DSigDB using the Enrichr web tool to identify potential therapeutic agents for COVID-19. A total of 29 ion channel-associated DEGs were identified. GO functional analysis showed that the DEGs were integral components of the plasma membrane and were mainly involved in inorganic cation transmembrane transport and ion channel activity functions. Pathway analysis showed that the DEGs were mainly involved in nicotine addiction, calcium regulation in the cardiac cell and neuronal system pathways. The top 10 hub genes screened based on the PPI network included KCNA2, KCNJ4, CACNA1A, CACNA1E, NALCN, KCNA5, CACNA2D1, TRPC1, TRPM3 and KCNN3. The TF-DEG and DEG-miRNA networks revealed significant TFs (FOXC1, GATA2, HINFP, USF2, JUN and NFKB1) and miRNAs (hsa-mir-146a-5p, hsa-mir-27a-3p, hsa-mir-335-5p, hsa-let-7b-5p and hsa-mir-129-2-3p). Gene-disease association network analysis revealed that the DEGs were closely associated with intellectual disability and cerebellar ataxia. Drug-target enrichment analysis showed that the relevant drugs targeting the hub genes CACNA2D1, CACNA1A, CACNA1E, KCNA2 and KCNA5 were gabapentin, gabapentin enacarbil, pregabalin, guanidine hydrochloride and 4-aminopyridine. The results of this study provide a valuable basis for exploring the mechanisms of ion channel genes in COVID-19 and clues for developing therapeutic strategies for COVID-19.
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Cui W, Wu H, Yu X, Song T, Xu X, Xu F. The Calcium Channel α2δ1 Subunit: Interactional Targets in Primary Sensory Neurons and Role in Neuropathic Pain. Front Cell Neurosci 2021; 15:699731. [PMID: 34658790 PMCID: PMC8514986 DOI: 10.3389/fncel.2021.699731] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Accepted: 09/10/2021] [Indexed: 11/13/2022] Open
Abstract
Neuropathic pain is mainly triggered after nerve injury and associated with plasticity of the nociceptive pathway in primary sensory neurons. Currently, the treatment remains a challenge. In order to identify specific therapeutic targets, it is necessary to clarify the underlying mechanisms of neuropathic pain. It is well established that primary sensory neuron sensitization (peripheral sensitization) is one of the main components of neuropathic pain. Calcium channels act as key mediators in peripheral sensitization. As the target of gabapentin, the calcium channel subunit α2δ1 (Cavα2δ1) is a potential entry point in neuropathic pain research. Numerous studies have demonstrated that the upstream and downstream targets of Cavα2δ1 of the peripheral primary neurons, including thrombospondins, N-methyl-D-aspartate receptors, transient receptor potential ankyrin 1 (TRPA1), transient receptor potential vanilloid family 1 (TRPV1), and protein kinase C (PKC), are involved in neuropathic pain. Thus, we reviewed and discussed the role of Cavα2δ1 and the associated signaling axis in neuropathic pain conditions.
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Affiliation(s)
- Wenqiang Cui
- Department of Neurology, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Hongyun Wu
- Department of Neurology, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Xiaowen Yu
- Department of Neurology, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Ting Song
- Department of Neurology, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Xiangqing Xu
- Department of Neurology, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Fei Xu
- Department of Geriatric Medicine, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China
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3
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Biet M, Dansereau M, Sarret P, Dumaine R. The neuronal potassium current I A is a potential target for pain during chronic inflammation. Physiol Rep 2021; 9:e14975. [PMID: 34405579 PMCID: PMC8371350 DOI: 10.14814/phy2.14975] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 05/10/2021] [Accepted: 06/25/2021] [Indexed: 11/24/2022] Open
Abstract
Voltage-gated ion channels play a key role in the action potential (AP) initiation and its propagation in sensory neurons. Modulation of their activity during chronic inflammation creates a persistent pain state. In this study, we sought to determine how peripheral inflammation caused by complete Freund's adjuvant (CFA) alters the fast sodium (INa ), L-type calcium (ICaL ), and potassium (IK ) currents in primary afferent fibers to increase nociception. In our model, intraplantar administration of CFA induced mechanical allodynia and thermal hyperalgesia at day 14 post-injection. Using whole-cell patch-clamp recording in dissociated small (C), medium (Aδ), and large-sized (Aβ) rat dorsal root ganglion (DRG) neurons, we found that CFA prolonged the AP duration and increased the amplitude of the tetrodotoxin-resistant (TTX-r) INa in Aβ fibers. In addition, CFA accelerated the recovery of INa from inactivation in C and Aδ nociceptive fibers but enhanced the late sodium current (INaL ) only in Aδ and Aβ neurons. Inflammation similarly reduced the amplitude of ICaL in each neuronal cell type. Fourteen days after injection, CFA reduced both components of IK (IKdr and IA ) in Aδ fibers. We also found that IA was significantly larger in C and Aδ neurons in normal conditions and during chronic inflammation. Our data, therefore, suggest that targeting the transient potassium current IA represents an efficient way to shift the balance toward antinociception during inflammation, since its activation will selectively decrease the AP duration in nociceptive fibers. Altogether, our data indicate that complex interactions between IK , INa , and ICaL reduce pain threshold by concomitantly enhancing the activity of nociceptive neurons and reducing the inhibitory action of Aβ fibers during chronic inflammation.
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MESH Headings
- Action Potentials
- Animals
- Calcium Channels, L-Type/metabolism
- Cells, Cultured
- Ganglia, Spinal/cytology
- Ganglia, Spinal/metabolism
- Ganglia, Spinal/physiology
- Male
- Neurons, Afferent/drug effects
- Neurons, Afferent/metabolism
- Neurons, Afferent/physiology
- Nociception
- Nociceptive Pain/metabolism
- Nociceptive Pain/physiopathology
- Potassium Channels, Voltage-Gated/metabolism
- Rats
- Rats, Sprague-Dawley
- Sodium Channel Blockers/pharmacology
- Sodium Channels/metabolism
- Tetrodotoxin/pharmacology
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Affiliation(s)
- Michael Biet
- Département de Pharmacologie et PhysiologieInstitut de pharmacologie de SherbrookeCentre de Recherche du Centre Hospitalier Universitaire de SherbrookeFaculté de médecine et des Sciences de la SantéUniversité de SherbrookeSherbrookeQuébecCanada
| | - Marc‐André Dansereau
- Département de Pharmacologie et PhysiologieInstitut de pharmacologie de SherbrookeCentre de Recherche du Centre Hospitalier Universitaire de SherbrookeFaculté de médecine et des Sciences de la SantéUniversité de SherbrookeSherbrookeQuébecCanada
| | - Philippe Sarret
- Département de Pharmacologie et PhysiologieInstitut de pharmacologie de SherbrookeCentre de Recherche du Centre Hospitalier Universitaire de SherbrookeFaculté de médecine et des Sciences de la SantéUniversité de SherbrookeSherbrookeQuébecCanada
| | - Robert Dumaine
- Département de Pharmacologie et PhysiologieInstitut de pharmacologie de SherbrookeCentre de Recherche du Centre Hospitalier Universitaire de SherbrookeFaculté de médecine et des Sciences de la SantéUniversité de SherbrookeSherbrookeQuébecCanada
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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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5
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Roca-Lapirot O, Radwani H, Aby F, Nagy F, Landry M, Fossat P. Calcium signalling through L-type calcium channels: role in pathophysiology of spinal nociceptive transmission. Br J Pharmacol 2017; 175:2362-2374. [PMID: 28214378 DOI: 10.1111/bph.13747] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Revised: 01/24/2017] [Accepted: 02/08/2017] [Indexed: 02/02/2023] Open
Abstract
L-type voltage-gated calcium channels are ubiquitous channels in the CNS. L-type calcium channels (LTCs) are mostly post-synaptic channels regulating neuronal firing and gene expression. They play a role in important physio-pathological processes such as learning and memory, Parkinson's disease, autism and, as recognized more recently, in the pathophysiology of pain processes. Classically, the fundamental role of these channels in cardiovascular functions has limited the use of classical molecules to treat LTC-dependent disorders. However, when applied locally in the dorsal horn of the spinal cord, the three families of LTC pharmacological blockers - dihydropyridines (nifedipine), phenylalkylamines (verapamil) and benzothiazepines (diltiazem) - proved effective in altering short-term sensitization to pain, inflammation-induced hyperexcitability and neuropathy-induced allodynia. Two subtypes of LTCs, Cav 1.2 and Cav 1.3, are expressed in the dorsal horn of the spinal cord, where Cav 1.2 channels are localized mostly in the soma and proximal dendritic shafts, and Cav 1.3 channels are more distally located in the somato-dendritic compartment. Together with their different kinetics and pharmacological properties, this spatial distribution contributes to their separate roles in shaping short- and long-term sensitization to pain. Cav 1.3 channels sustain the expression of plateau potentials, an input/output amplification phenomenon that contributes to short-term sensitization to pain such as prolonged after-discharges, dynamic receptive fields and windup. The Cav 1.2 channels support calcium influx that is crucial for the excitation-transcription coupling underlying nerve injury-induced dorsal horn hyperexcitability. These subtype-specific cellular mechanisms may have different consequences in the development and/or the maintenance of pathological pain. Recent progress in developing more specific compounds for each subunit will offer new opportunities to modulate LTCs for the treatment of pathological pain with reduced side-effects. LINKED ARTICLES This article is part of a themed section on Recent Advances in Targeting Ion Channels to Treat Chronic Pain. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v175.12/issuetoc.
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Affiliation(s)
- Olivier Roca-Lapirot
- Interdisciplinary Institute for Neuroscience (IINS, CNRS UMR 5297), University of Bordeaux, Bordeaux Cedex, France
| | - Houda Radwani
- Interdisciplinary Institute for Neuroscience (IINS, CNRS UMR 5297), University of Bordeaux, Bordeaux Cedex, France
| | - Franck Aby
- Interdisciplinary Institute for Neuroscience (IINS, CNRS UMR 5297), University of Bordeaux, Bordeaux Cedex, France
| | - Frédéric Nagy
- Interdisciplinary Institute for Neuroscience (IINS, CNRS UMR 5297), University of Bordeaux, Bordeaux Cedex, France
| | - Marc Landry
- Interdisciplinary Institute for Neuroscience (IINS, CNRS UMR 5297), University of Bordeaux, Bordeaux Cedex, France
| | - Pascal Fossat
- Interdisciplinary Institute for Neuroscience (IINS, CNRS UMR 5297), University of Bordeaux, Bordeaux Cedex, France
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6
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Targeting human Mas-related G protein-coupled receptor X1 to inhibit persistent pain. Proc Natl Acad Sci U S A 2017; 114:E1996-E2005. [PMID: 28223516 DOI: 10.1073/pnas.1615255114] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Human Mas-related G protein-coupled receptor X1 (MRGPRX1) is a promising target for pain inhibition, mainly because of its restricted expression in nociceptors within the peripheral nervous system. However, constrained by species differences across Mrgprs, drug candidates that activate MRGPRX1 do not activate rodent receptors, leaving no responsive animal model to test the effect on pain in vivo. Here, we generated a transgenic mouse line in which we replaced mouse Mrgprs with human MrgprX1 This humanized mouse allowed us to characterize an agonist [bovine adrenal medulla 8-22 (BAM8-22)] and a positive allosteric modulator (PAM), ML382, of MRGPRX1. Cellular studies suggested that ML382 enhances the ability of BAM8-22 to inhibit high-voltage-activated Ca2+ channels and attenuate spinal nociceptive transmission. Importantly, both BAM8-22 and ML382 effectively attenuated evoked, persistent, and spontaneous pain without causing obvious side effects. Notably, ML382 by itself attenuated both evoked pain hypersensitivity and spontaneous pain in MrgprX1 mice after nerve injury without acquiring coadministration of an exogenous agonist. Our findings suggest that humanized MrgprX1 mice provide a promising preclinical model and that activating MRGPRX1 is an effective way to treat persistent pain.
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7
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Sanzarello I, Merlini L, Rosa MA, Perrone M, Frugiuele J, Borghi R, Faldini C. Central sensitization in chronic low back pain: A narrative review. J Back Musculoskelet Rehabil 2016; 29:625-633. [PMID: 27062464 DOI: 10.3233/bmr-160685] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Low back pain is one of the four most common disorders in all regions, and the greatest contributor to disability worldwide, adding 10.7% of total years lost due to this health state. The etiology of chronic low back pain is, in most of the cases (up to 85%), unknown or nonspecific, while the specific causes (specific spinal pathology and neuropathic/radicular disorders) are uncommon. Central sensitization has been recently recognized as a potential pathophysiological mechanism underlying a group of chronic pain conditions, and may be a contributory factor for a sub-group of patients with chronic low back pain. The purposes of this narrative review are twofold. First, to describe central sensitization and its symptoms and signs in patients with chronic pain disorders in order to allow its recognition in patients with nonspecific low back pain. Second, to provide general treatment principles of chronic low back pain with particular emphasis on pharmacotherapy targeting central sensitization.
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Affiliation(s)
- Ilaria Sanzarello
- Section of Orthopedics and Traumatology, University of Messina, Messina, Italy
| | - Luciano Merlini
- Laboratory of Musculoskeletal Cell Biology, Istituto Ortopedico Rizzoli, IRCCS, Bologna, Italy
| | | | - Mariada Perrone
- Anesthesia and Post-Operative Intensive Care, Rizzoli-Sicilia Department, Rizzoli Orthopedic Institute, Bagheria (Palermo), Italy
| | - Jacopo Frugiuele
- Anesthesia and Post-Operative Intensive Care, Rizzoli-Sicilia Department, Rizzoli Orthopedic Institute, Bagheria (Palermo), Italy
| | - Raffaele Borghi
- General Orthopedic Surgery, Rizzoli-Sicilia Department, Rizzoli Orthopedic Institute, Bagheria (Palermo), Italy
| | - Cesare Faldini
- General Orthopedic Surgery, Rizzoli-Sicilia Department, Rizzoli Orthopedic Institute, Bagheria (Palermo), Italy
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8
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Radwani H, Lopez-Gonzalez MJ, Cattaert D, Roca-Lapirot O, Dobremez E, Bouali-Benazzouz R, Eiríksdóttir E, Langel Ü, Favereaux A, Errami M, Landry M, Fossat P. Cav1.2 and Cav1.3 L-type calcium channels independently control short- and long-term sensitization to pain. J Physiol 2016; 594:6607-6626. [PMID: 27231046 DOI: 10.1113/jp272725] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2016] [Accepted: 05/22/2016] [Indexed: 11/08/2022] Open
Abstract
KEY POINTS L-type calcium channels in the CNS exist as two subunit forming channels, Cav1.2 and Cav1.3, which are involved in short- and long-term plasticity. We demonstrate that Cav1.3 but not Cav1.2 is essential for wind-up. These results identify Cav1.3 as a key conductance responsible for short-term sensitization in physiological pain transmission. We confirm the role of Cav1.2 in a model of long-term plasticity associated with neuropathic pain. Up-regulation of Cav1.2 and down-regultation of Cav1.3 in neuropathic pain underlies the switch from physiology to pathology. Finally, the results of the present study reveal that therapeutic targeting molecular pathways involved in wind-up may be not relevant in the treatment of neuropathy. ABSTRACT Short-term central sensitization to pain temporarily increases the responsiveness of nociceptive pathways after peripheral injury. In dorsal horn neurons (DHNs), short-term sensitization can be monitored through the study of wind-up. Wind-up, a progressive increase in DHNs response following repetitive peripheral stimulations, depends on the post-synaptic L-type calcium channels. In the dorsal horn of the spinal cord, two L-type calcium channels are present, Cav1.2 and Cav1.3, each displaying specific kinetics and spatial distribution. In the present study, we used a mathematical model of DHNs in which we integrated the specific patterns of expression of each Cav subunits. This mathematical approach reveals that Cav1.3 is necessary for the onset of wind-up, whereas Cav1.2 is not and that synaptically triggered wind-up requires NMDA receptor activation. We then switched to a biological preparation in which we knocked down Cav subunits and confirmed the prominent role of Cav1.3 in both naive and spinal nerve ligation model of neuropathy (SNL). Interestingly, although a clear mechanical allodynia dependent on Cav1.2 expression was observed after SNL, the amplitude of wind-up was decreased. These results were confirmed with our model when adapting Cav1.3 conductance to the changes observed after SNL. Finally, our mathematical approach predicts that, although wind-up amplitude is decreased in SNL, plateau potentials are not altered, suggesting that plateau and wind-up are not fully equivalent. Wind-up and long-term hyperexcitability of DHNs are differentially controlled by Cav1.2 and Cav1.3, therefore confirming that short- and long-term sensitization are two different phenomena triggered by distinct mechanisms.
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Affiliation(s)
- Houda Radwani
- University of Bordeaux, Bordeaux, France.,CNRS, IINS, UMR5297, Bordeaux, France.,Faculty of Sciences, Abdelmalek Essaâdi University, Tetouan, Morocco
| | | | - Daniel Cattaert
- University of Bordeaux, Bordeaux, France.,CNRS, INCIA, UMR 5287, Talence, France
| | | | - Eric Dobremez
- University of Bordeaux, Bordeaux, France.,Department of Pediatric Surgery, University Hospital of Bordeaux, Bordeaux, France
| | | | - Emelía Eiríksdóttir
- Department of Neurochemistry and Neurotoxicology, Stockholm University, Stockholm, Sweden
| | - Ülo Langel
- Department of Neurochemistry and Neurotoxicology, Stockholm University, Stockholm, Sweden
| | - Alexandre Favereaux
- University of Bordeaux, Bordeaux, France.,CNRS, IINS, UMR5297, Bordeaux, France
| | - Mohammed Errami
- Faculty of Sciences, Abdelmalek Essaâdi University, Tetouan, Morocco
| | - Marc Landry
- University of Bordeaux, Bordeaux, France.,CNRS, IINS, UMR5297, Bordeaux, France
| | - Pascal Fossat
- University of Bordeaux, Bordeaux, France.,CNRS, IINS, UMR5297, Bordeaux, France
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9
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Yamamoto K, Tsuboi M, Kambe T, Abe K, Nakatani Y, Kawakami K, Utsunomiya I, Taguchi K. Oxaliplatin administration increases expression of the voltage-dependent calcium channel α2δ-1 subunit in the rat spinal cord. J Pharmacol Sci 2016; 130:117-22. [PMID: 26883453 DOI: 10.1016/j.jphs.2016.01.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Revised: 01/11/2016] [Accepted: 01/20/2016] [Indexed: 11/18/2022] Open
Abstract
Oxaliplatin is a chemotherapeutic agent that is effective against various types of cancer including colorectal cancer. Acute cold hyperalgesia is a serious side effect of oxaliplatin treatment. Although the therapeutic drug pregabalin is beneficial for preventing peripheral neuropathic pain by targeting the voltage-dependent calcium channel α2δ-1 (Cavα2δ-1) subunit, the effect of oxaliplatin-induced acute cold hypersensitivity is uncertain. To analyze the contribution of the Cavα2δ-1 subunit to the development of oxaliplatin-induced acute cold hypersensitivity, Cavα2δ-1 subunit expression in the rat spinal cord was analyzed after oxaliplatin treatment. Behavioral assessment using the acetone spray test showed that 6 mg/kg oxaliplatin-induced cold hypersensitivity 2 and 4 days later. Oxaliplatin-induced acute cold hypersensitivity 4 days after treatment was significantly inhibited by pregabalin (50 mg/kg, p.o.). Oxaliplatin (6 mg/kg, i.p.) treatment increased the expression level of Cavα2δ-1 subunit mRNA and protein in the spinal cord 2 and 4 days after treatment. Immunohistochemistry showed that oxaliplatin increased Cavα2δ-1 subunit protein expression in superficial layers of the spinal dorsal horn 2 and 4 days after treatment. These results suggest that oxaliplatin treatment increases Cavα2δ-1 subunit expression in the superficial layers of the spinal cord and may contribute to functional peripheral acute cold hypersensitivity.
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Affiliation(s)
- Ken Yamamoto
- Department of Education and Research Center for Clinical Pharmacy, Showa Pharmaceutical University, Machida, Tokyo 194-8543, Japan
| | - Mayuko Tsuboi
- Department of Medicinal Pharmacology, Showa Pharmaceutical University, Machida, Tokyo 194-8543, Japan
| | - Toshie Kambe
- Department of Pharmacology, Showa Pharmaceutical University, Machida, Tokyo 194-8543, Japan
| | - Kenji Abe
- Department of Pharmacology, School of Pharmaceutical Sciences, Ohu University, 31-1 Tomitamachi, Koriyama, Fukushima 963-8611, Japan
| | - Yoshihiko Nakatani
- Department of Medicinal Pharmacology, Showa Pharmaceutical University, Machida, Tokyo 194-8543, Japan
| | - Kazuyoshi Kawakami
- Department of Pharmacy, Cancer Institute Hospital, 3-10-6 Ariake, Koto-Ku, Tokyo 135-8550, Japan
| | - Iku Utsunomiya
- Department of Developmental Education, Showa Pharmaceutical University, Machida, Tokyo 194-8543, Japan
| | - Kyoji Taguchi
- Department of Medicinal Pharmacology, Showa Pharmaceutical University, Machida, Tokyo 194-8543, Japan.
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10
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De Iuliis F, Taglieri L, Salerno G, Lanza R, Scarpa S. Taxane induced neuropathy in patients affected by breast cancer: Literature review. Crit Rev Oncol Hematol 2015; 96:34-45. [PMID: 26004917 DOI: 10.1016/j.critrevonc.2015.04.011] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Revised: 02/10/2015] [Accepted: 04/30/2015] [Indexed: 12/11/2022] Open
Abstract
Taxane induced neuropathy (TIN) is the most limiting side effect of taxane based chemotherapy, relative to the majority of breast cancer patients undergoing therapy with both docetaxel and paclitaxel. The symptoms begin symmetrically from the toes, because the tips of the longest nerves are affected for first. The patients report sensory symptoms such as paresthesia, dysesthesia, numbness, electric shock-like sensation, motor impairment and neuropathic pain. There is a great inter-individual variability among breast cancer women treated with taxanes, in fact 20-30% of them don't develop neurotoxicity. Actually, there is no standard therapy for TIN, although many medications, antioxidants and natural substances have been tested in vitro and in vivo. We will summarize all most recent literature data on TIN prevention and treatment, in order to reach an improvement in TIN management. Further studies are needed to evaluate new therapies that restore neuronal function and improve life quality of patients.
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Affiliation(s)
- Francesca De Iuliis
- Experimental Medicine Department, Sapienza University, viale Regina Elena 324, 00161 Rome, Italy
| | - Ludovica Taglieri
- Experimental Medicine Department, Sapienza University, viale Regina Elena 324, 00161 Rome, Italy
| | - Gerardo Salerno
- Experimental Medicine Department, Sapienza University, viale Regina Elena 324, 00161 Rome, Italy
| | - Rosina Lanza
- Ginecology and Obstetrics Department, Sapienza University, viale Regina Elena 324, 00161 Rome, Italy
| | - Susanna Scarpa
- Experimental Medicine Department, Sapienza University, viale Regina Elena 324, 00161 Rome, Italy.
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Huynh TG, Cuny H, Slesinger PA, Adams DJ. Novel Mechanism of Voltage-Gated N-type (Cav2.2) Calcium Channel Inhibition Revealed through α-Conotoxin Vc1.1 Activation of the GABAB Receptor. Mol Pharmacol 2014; 87:240-50. [DOI: 10.1124/mol.114.096156] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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12
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Gorham L, Just S, Doods H. Somatostatin 4 receptor activation modulates G-protein coupled inward rectifying potassium channels and voltage stimulated calcium signals in dorsal root ganglion neurons. Eur J Pharmacol 2014; 736:101-6. [PMID: 24769416 DOI: 10.1016/j.ejphar.2014.04.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Revised: 04/10/2014] [Accepted: 04/10/2014] [Indexed: 12/01/2022]
Abstract
Somatostatin has a wide biological profile resulting from its actions on the five receptor subtypes (sst1-5). Recently somatostatin was shown to exert analgesic effects via activation of the sst4 receptor. Although the analgesia in pain models is established, the precise molecular mechanism has yet to be fully elucidated. This research aimed to identify possible anti-nociceptive mechanisms, showing functional links of the sst4 receptor to G-protein coupled inward rectifying potassium (GIRK) channels and reduction of voltage stimulated calcium influx within the pain processing pathway. Whole cell voltage clamp experiments and calcium imaging experiments were conducted on DRG neurons prepared from adult rats. Application of an sst4 receptor selective agonist, J-2156, on DRG neurons induced a GIRK modulated potassium current, and inhibited voltage sensitive calcium current. Both mechanisms are thought to contribute to the analgesic properties of sst4 receptor agonists.
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Affiliation(s)
- Louise Gorham
- Boehringer Ingelheim Pharma GmbH & Co. KG, Department of CNS Diseases Research Germany, Birkendorfer Strasse 65, 88397 Biberach an der Riss, Germany
| | - Stefan Just
- Boehringer Ingelheim Pharma GmbH & Co. KG, Department of CNS Diseases Research Germany, Birkendorfer Strasse 65, 88397 Biberach an der Riss, Germany.
| | - Henri Doods
- Boehringer Ingelheim Pharma GmbH & Co. KG, Department of CNS Diseases Research Germany, Birkendorfer Strasse 65, 88397 Biberach an der Riss, Germany
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13
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Kang SJ, Liu MG, Shi TY, Zhao MG, Kaang BK, Zhuo M. N-type voltage gated calcium channels mediate excitatory synaptic transmission in the anterior cingulate cortex of adult mice. Mol Pain 2013; 9:58. [PMID: 24228737 PMCID: PMC3842823 DOI: 10.1186/1744-8069-9-58] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Accepted: 11/04/2013] [Indexed: 12/28/2022] Open
Abstract
Voltage gated calcium channels (VGCCs) are well known for its importance in synaptic transmission in the peripheral and central nervous system. However, the role of different VGCCs in the anterior cingulate cortex (ACC) has not been studied. Here, we use a multi-electrode array recording system (MED64) to study the contribution of different types of calcium channels in glutamatergic excitatory synaptic transmission in the ACC. We found that only the N-type calcium channel blocker ω-conotoxin-GVIA (ω-Ctx-GVIA) produced a great inhibition of basal synaptic transmission, especially in the superficial layer. Other calcium channel blockers that act on L-, P/Q-, R-, and T-type had no effect. We also tested the effects of several neuromodulators with or without ω-Ctx-GVIA. We found that N-type VGCC contributed partially to (1S,3R)-1-aminocyclopentane-1,3-dicarboxylic acid- and (R)-Baclofen-induced synaptic inhibition. By contrast, the inhibitory effects of 2-Chloroadenosine and carbamoylcholine chloride did not differ with or without ω-Ctx-GVIA, indicating that they may act through other mechanisms. Our results provide strong evidence that N-type VGCCs mediate fast synaptic transmission in the ACC.
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Affiliation(s)
| | | | | | | | | | - Min Zhuo
- Department of Brain and Cognitive Sciences, College of Natural Sciences, Seoul National University, Seoul 151-746, South Korea.
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14
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Kawakami K, Chiba T, Katagiri N, Saduka M, Abe K, Utsunomiya I, Hama T, Taguchi K. Paclitaxel increases high voltage-dependent calcium channel current in dorsal root ganglion neurons of the rat. J Pharmacol Sci 2013; 120:187-95. [PMID: 23090716 DOI: 10.1254/jphs.12123fp] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
Abstract
Peripheral neuropathic pain is a serious side effect of paclitaxel treatment. However, the mechanism of this paclitaxel-induced neuropathic pain is unknown. In this study, we investigated the effects of paclitaxel on the voltage-dependent calcium channel (VDCC) current in rat dorsal root ganglion (DRG) neurons using the whole-cell patch clamp technique. Behavioral assessment using von Frey filament stimuli showed that 2 and 4 mg/kg paclitaxel treatment induced mechanical allodynia/hyperalgesia. Paclitaxel-induced mechanical hyperalgesia was significantly inhibited by gabapentin (100 mg/kg). Using the patch clamp method, we observed that paclitaxel (4 mg/kg) treatment significantly increased the VDCC current in small- and medium-diameter DRG neurons. Moreover, paclitaxel-induced increase in the VDCC current in medium-diameter DRG neurons was completely inhibited by 10 and 100 μM gabapentin. Similar effects in small-diameter DRG neurons were only seen with 100 μM gabapentin. Western blotting revealed that paclitaxel increased protein levels of the VDCC subunit α₂δ-1 (Ca(v)α₂δ-1) in DRG neurons. Immunohistochemistry showed that paclitaxel treatment increased Ca(v)α₂δ-1 protein expression in DRG neurons. Thus, paclitaxel treatment increases the VDCC current in small- and medium-diameter DRG neurons and upregulates Ca(v)α₂δ-1. The antihyperalgesic action of gabapentin may be due to inhibition of paclitaxel-induced increases in the VDCC current in DRG neurons.
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Affiliation(s)
- Kazuyoshi Kawakami
- Department of Medicinal Pharmacology, Showa Pharmaceutical University, Machida, Tokyo, Japan
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15
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Lee JR, Lee PB, Choe G, Lee SC, Lee HM, Kim E, Kim YC. Evaluation of the neurological safety of epidurally-administered pregabalin in rats. Korean J Anesthesiol 2012; 62:57-65. [PMID: 22323956 PMCID: PMC3272531 DOI: 10.4097/kjae.2012.62.1.57] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2011] [Revised: 06/27/2011] [Accepted: 07/11/2011] [Indexed: 11/28/2022] Open
Abstract
Background The primary site of action of pregabalin, i.e. the α-2-δ subunit of the voltage-dependent calcium channel, is located at the dorsal root ganglion and dorsal horn of the spinal cord. Therefore, the epidural administration of pregabalin could have advantages over oral administration. However, the possibility of its neurotoxicity should be excluded before any attempt at epidural administration. We evaluated the neuronal safety of epidurally-administered pregabalin by observing the sensory/motor changes and examining the histopathology of spinal cord in rats. Methods Sixty rats of 180-230 g were divided into three groups; 3 mg of pregabalin dissolved in 0.3 ml saline (group P, n = 20), 0.3 ml 40% alcohol (group A, n = 20), or 0.3 ml normal saline (group N, n = 20) was administered epidurally to the rats in each group. Pinch-toe test, motor function evaluation, and histopathologic examination of vacuolation, chromatolysis, meningeal inflammation, and neuritis were performed at the 1st, 3rd, 7th, and 21st day after each epidural administration. Results All rats enrolled in group P, like those in group N, showed neither sensory/motor dysfunction nor any histopathological abnormality over the 3-week observation period. In contrast, in group A, 80% of the rats showed abnormal response to the pinch-toe test and all rats showed decreased motor function during the entire evaluation period. In addition, all histopathologic findings of neurotoxicity were observed exclusively in group A. Conclusions The epidurally administered pregabalin (about 15 mg/kg) did not cause any neurotoxic evidence, in terms of both sensory/motor function evaluation and histopathological examination in rats.
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Affiliation(s)
- Jeong Rim Lee
- Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul, Korea
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16
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Abstract
Phosphoinositides, especially phosphatidylinositol 4,5-bisphosphate [PtdIns(4,5)P(2)] are required for the activity of many different ion channels. This chapter will highlight various aspects of this paradigm, by discussing current knowledge on four different ion channel families: inwardly rectifying K(+) (Kir) channels, KCNQ voltage gated K(+) channels, voltage gated Ca(2+) (VGCC) channels and Transient Receptor Potential (TRP) channels. Our main focus is to discuss functional aspects of this regulation, i.e. how changes in the concentration of PtdIns(4,5)P(2) in the plasma membrane upon phospholipase C activation may modulate the activity of ion channels, and what are the major determinants of this regulation. We also discuss how channels act as coincidence detectors sensing phosphoinositide levels and other signalling molecules. We also briefly discuss the available methods to study phosphoinositide regulation of ion channels, and structural aspects of interaction of ion channel proteins with these phospholipids. Finally, in several cases the effect of PtdIns(4,5)P(2) is more complex than a simple dependence of ion channel activity on the lipid, and we will discuss some these complexities.
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Affiliation(s)
- Nikita Gamper
- Institute of Membrane and Systems Biology, Faculty of Biological Sciences, University of Leeds, LS2 9JT, Leeds, UK,
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Cury Y, Picolo G, Gutierrez VP, Ferreira SH. Pain and analgesia: The dual effect of nitric oxide in the nociceptive system. Nitric Oxide 2011; 25:243-54. [DOI: 10.1016/j.niox.2011.06.004] [Citation(s) in RCA: 180] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2010] [Revised: 02/17/2011] [Accepted: 06/16/2011] [Indexed: 01/22/2023]
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Takahashi T, Aoki Y, Okubo K, Maeda Y, Sekiguchi F, Mitani K, Nishikawa H, Kawabata A. Upregulation of Ca(v)3.2 T-type calcium channels targeted by endogenous hydrogen sulfide contributes to maintenance of neuropathic pain. Pain 2010; 150:183-191. [PMID: 20546998 DOI: 10.1016/j.pain.2010.04.022] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2009] [Revised: 04/09/2010] [Accepted: 04/20/2010] [Indexed: 11/28/2022]
Abstract
Hydrogen sulfide (H(2)S) formed from l-cysteine by multiple enzymes including cystathionine-gamma-lyase (CSE) is now considered a gasotransmitter in the mammalian body. Our previous studies have shown that H(2)S activates/sensitizes Ca(v)3.2 T-type Ca(2+) channels, leading to facilitation of somatic and visceral nociception, and that CSE-derived endogenous H(2)S participates in inflammatory pain. Here, we show novel evidence for involvement of the endogenous H(2)S-Ca(v)3.2 pathway in neuropathic pain. In the rat subjected to the right L5 spinal nerve cutting (L5SNC), a neuropathic pain model, i.p. administration of dl-propargylglycine (PPG) and beta-cyanoalanine, irreversible and reversible CSE inhibitors, respectively, strongly suppressed the neuropathic hyperalgesia/allodynia. The anti-hyperalgesic effect of PPG was reversed by intraplantar administration of NaHS, a donor for H(2)S, in the L5SNC rat. Intraplantar administration or topical application of mibefradil, a T-type Ca(2+) channel blocker, reversed hyperalgesia in the L5SNC rat. The protein levels of Ca(v)3.2, but not CSE, in the ipsilateral L4, L5 and L6 dorsal root ganglia were dramatically upregulated in the L5SNC rat. Finally, silencing of Ca(v)3.2 in DRG by repeated intrathecal administration of Ca(v)3.2-targeting siRNA significantly attenuated the neuropathic hyperalgesia in the L5SNC rat. In conclusion, our data suggest that Ca(v)3.2 T-type Ca(2+) channels in sensory neurons are upregulated and activated/sensitized by CSE-derived endogenous H(2)S after spinal nerve injury, contributing to the maintenance of neuropathic pain. We thus propose that Ca(v)3.2 and CSE could be targets for the development of therapeutic drugs for the treatment of neuropathic pain.
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Affiliation(s)
- Tomoko Takahashi
- Division of Pharmacology & Pathophysiology, Kinki University School of Pharmacy, Higashi-Osaka 577-8502, Japan
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19
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Novel strategies for the treatment of inflammatory hyperalgesia. Eur J Clin Pharmacol 2010; 66:429-44. [DOI: 10.1007/s00228-010-0784-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2009] [Accepted: 01/11/2010] [Indexed: 12/24/2022]
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20
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Effects of neuropathy on high-voltage-activated Ca2+ current in sensory neurones. Cell Calcium 2009; 46:248-56. [DOI: 10.1016/j.ceca.2009.08.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2009] [Revised: 06/22/2009] [Accepted: 08/05/2009] [Indexed: 11/15/2022]
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21
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Abstract
Injury and inflammation trigger activation of several critical cellular pathways in nociceptive signaling in the peripheral nervous system, but their precise molecular mechanisms have not been clearly defined. Cyclin-dependent kinase 5 (Cdk5), a serine/threonine kinase, is mainly expressed in the post-mitotic neurons, and has many important roles in the development, functions and pathophysiology of diseases of the nervous system. Although many functional roles of Cdk5 have been identified in neurons, its precise role in pain signaling has not been well determined. Experimental inflammation in the hind paws of mice resulted in increased mRNA and protein levels of Cdk5 and its activator p35, as well as the Cdk5 activity in nociceptive neurons (Pareek et al., 2006). Furthermore, we also identified that Cdk5 phosphorylates transient receptor potential vanilloid 1 (TRPV1), a key receptor that modulates agonist-induced calcium influx in the neurons (Pareek et al., 2007). We subsequently demonstrated that inflammation triggers increase in Cdk5 activity through activation of early growth response 1 (Egr-1) and p35 expression by tumor necrosis factor alpha (TNF-α) (Utreras et al., 2009). These findings suggest that Cdk5 plays an important role in pain signaling and therefore Cdk5 and its activators are potentially important drug targets for development of novel analgesics to treat neuropathic pain.
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22
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Dale CS, Altier C, Cenac N, Giorgi R, Juliano MA, Juliano L, Zamponi GW, Vergnolle N. Analgesic properties of S100A9 C-terminal domain: a mechanism dependent on calcium channel inhibition. Fundam Clin Pharmacol 2009; 23:427-38. [DOI: 10.1111/j.1472-8206.2009.00686.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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23
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Golan E, Haggiag I, Os P, Bernheim J. Calcium, parathyroid hormone, and vitamin D: major determinants of chronic pain in hemodialysis patients. Clin J Am Soc Nephrol 2009; 4:1374-80. [PMID: 19578003 DOI: 10.2215/cjn.00680109] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND AND OBJECTIVES Pain is a frequent complaint of hemodialysis (HD) patients, yet information regarding its causes and frequency is relatively scarce. The aim of this study was to evaluate the frequency and possible causes of chronic pain in patients who are on long-term HD. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS We prospectively enrolled 100 patients who were undergoing maintenance HD for at least 3 mo. Pain was evaluated using the Brief Pain Inventory. Data collected on each participant included age, gender, ethnic origin, body mass index, smoking habits, time on dialysis, type of blood access, comorbidities, and biochemical and hematologic parameters. RESULTS The average age was 64.5 yr; the average time on dialysis 40.4 mo. Forty-five patients were male. Thirty-one participants were of Arabic origin. Fifty-three patients had diabetes, 36 of whom had diabetic retinopathy. Although 51 patients experienced chronic pain, only 19.6% described the pain as severe. Musculoskeletal pain, neuropathic pain, and headache were the most prevalent forms of pain. The presence of diabetic retinopathy and neuropathy (but not diabetes per se) and levels of intact parathyroid hormone, calcium, and calcitriol (but not 25-hydroxyvitamin D(3)) differed significantly between those who experienced chronic pain and those who did not. On a logistic regression model, higher serum calcium levels and intact parathyroid hormone levels >250 pg/ml were independently associated with chronic pain, as well as the presence of diabetic retinopathy. Calcitriol had a marginal effect. CONCLUSIONS Disturbed mineral metabolism is strongly associated with chronic pain in long-term HD patients, along with microangiopathy.
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Affiliation(s)
- Eliezer Golan
- Department of Nephrology and Hypertension, Meir Medical Center, 59 Tchernichovsky Street, Kfar Saba 44281, Israel.
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Asadi S, Javan M, Ahmadiani A, Sanati MH. Alternative Splicing in the Synaptic Protein Interaction Site of Rat Cav2.2 (α1B) Calcium Channels: Changes Induced by Chronic Inflammatory Pain. J Mol Neurosci 2009; 39:40-8. [DOI: 10.1007/s12031-008-9159-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2008] [Accepted: 10/27/2008] [Indexed: 10/21/2022]
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Niimi K, Takahashi E, Itakura C. Age-related difference in nociceptive behavior between SAMP6 and SAMR1 strains. Neurosci Lett 2008; 444:60-3. [PMID: 18703115 DOI: 10.1016/j.neulet.2008.08.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2008] [Revised: 07/23/2008] [Accepted: 08/04/2008] [Indexed: 11/16/2022]
Abstract
Senescence accelerated prone mouse 6 (SAMP6) mice have been known to be a model for accelerated aging. Compared with the normal control senescence accelerated resistant mouse 1 (SAMR1) mice, although the SAMP6 mice have normal bone mass at 4 months, they exhibit a significantly lower bone mass at 8 months. It was recently reported that SAMP6 has memory deficit at 4 months of age, indicating that the change of nervous function might be already detected at 4 months of age. To assess whether SAMP6 mice exhibit an age-related abnormality of nociceptive transmission, we examined a battery of tests using the von Frey test for mechanically induced response, the hot plate test for thermally induced response, and the formalin paw test for chemically induced response. SAMP6 and SAMR1 showed similar response patterns in the von Frey test and the hot plate test. In the formalin paw test, 1-month-old SAMP6 and SAMR1 had similar responses, while 4-month-old SAMP6 exhibited attenuated phase 2 response, but normal phase 1 response. These findings indicate that onset of age-related phenotypes in SAMP6 differs in different tissues. SAMP6 could be useful to delineate the involvement of age-related nociceptive mechanisms.
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Affiliation(s)
- Kimie Niimi
- Brain Science and Life Technology Research Foundation, 1-28-12 Narimasu, Itabashi, Tokyo 175-0094, Japan
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26
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Gribkoff VK. The therapeutic potential of neuronal K V 7 (KCNQ) channel modulators: an update. Expert Opin Ther Targets 2008; 12:565-81. [PMID: 18410240 DOI: 10.1517/14728222.12.5.565] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND Neuronal KCNQ channels (K(V)7.2-5) represent attractive targets for the development of therapeutics for chronic and neuropathic pain, migraine, epilepsy and other neuronal hyperexcitability disorders, although there has been only modest progress in translating this potential into useful therapeutics. OBJECTIVE Compelling evidence of the importance of K(V)7 channels as neuronal regulatory elements, readily amenable to pharmacological modulation, has sustained widespread interest in these channels as drug targets. This review will update readers on key aspects of the characterization of these important ion channel targets, and will discuss possible current barriers to their exploitation for CNS therapeutics. METHODS This article is based on a review of recent literature, with a focus on data pertaining to the roles of these channels in neurophysiology. In addition, I review some of the regulatory elements that influence the channels and how these may relate to channel pharmacology, and present a review of recent advances in neuronal K(V)7 channel pharmacology. CONCLUSIONS These channels continue to be valid and approachable targets for CNS therapeutics. However, we may need to understand more about the roles of neuronal K(V)7 channels during the development of disease states, as well as to pay more attention to a detailed analysis of the molecular pharmacology of the different channel subfamily members and the modes of interaction of individual modulators, in order to successfully target these channels for therapeutic development.
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Affiliation(s)
- Valentin K Gribkoff
- Knopp Neurosciences, Inc., 2100 Wharton Street, Suite 615, Pittsburgh, PA 15203, USA.
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Gabapentin Supplemented With Ropivacain Block of Trigger Points Improves Pain Control and Quality of Life in Trigeminal Neuralgia Patients When Compared With Gabapentin Alone. Clin J Pain 2008; 24:64-75. [DOI: 10.1097/ajp.0b013e318158011a] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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28
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Gamper N, Shapiro MS. Regulation of ion transport proteins by membrane phosphoinositides. Nat Rev Neurosci 2007; 8:921-34. [DOI: 10.1038/nrn2257] [Citation(s) in RCA: 192] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Willett P, Wilton D, Hartzoulakis B, Tang R, Ford J, Madge D. Prediction of Ion Channel Activity Using Binary Kernel Discrimination. J Chem Inf Model 2007; 47:1961-6. [PMID: 17622131 DOI: 10.1021/ci700087v] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Voltage-gated ion channels are a diverse family of pharmaceutically important membrane proteins for which limited 3D information is available. A number of virtual screening tools have been used to assist with the discovery of new leads and with the analysis of screening results. One such tool, and the subject of this paper, is binary kernel discrimination (BKD), a machine-learning approach that has recently been applied to applications in chemoinformatics. It uses a training set of compounds, for which both structural and qualitative activity data are known, to produce a model that can then be used to rank another set of compounds in order of likely activity. Here, we report the use of BKD to build models for the prediction of five different ion channel targets using two types of activity data. The results obtained suggest that the approach provides an effective way of prioritizing compounds for acquisition and testing.
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Affiliation(s)
- Peter Willett
- Department of Information Studies, University of Sheffield, 211 Portobello Street, Sheffield S1 4DP, United Kingdom.
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