101
|
Nakamura M, Jang IS. Characterization of dural afferent neurons innervating cranial blood vessels within the dura in rats. Brain Res 2018; 1696:91-102. [PMID: 29886250 DOI: 10.1016/j.brainres.2018.06.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Revised: 06/05/2018] [Accepted: 06/07/2018] [Indexed: 12/16/2022]
Abstract
Dural afferent neurons are implicated in primary headaches including migraine. Although a significant portion of primary afferent neurons innervating the dura are myelinated A-type neurons, previous electrophysiological studies have primarily characterized the functional properties of small-sized C-type sensory neurons. Here we show the functional characterization of dural afferent neurons identified with the fluorescent dye DiI. DiI-positive neurons were divided into three types: small-, medium-, and large-sized neurons, based on their diameter, area, and membrane capacitance. The immunoreactivity of NF200, a marker of A-type myelinated neurons, was detected in most large-sized, but it was also present in a limited number of small- and medium-sized DiI-positive neurons. Capsaicin, a transient receptor potential vanilloid 1 agonist, induced the membrane currents in most small- and medium-sized neurons, but not in large-sized DiI-positive neurons. Tetrodotoxin-resistant Na+ channels were expressed in almost all types of DiI-positive neurons. Mechanosensitive currents were detected from a majority of large-sized, and to a lesser extent, small- and medium-sized DiI-positive neurons. The results suggest that most dural afferent neurons are nociceptive, e.g., polymodal C-type for small- and medium-sized neurons, and high-threshold nociceptive A-type mechanoreceptors for large-sized neurons. We also found that DiI-positive neurons differed with respect to passive and active membrane properties, and that sumatriptan, a representative drug used for the acute treatment of migraine attack, inhibited voltage-gated Ca2+ currents in all types of DiI-positive neurons. The present results showing the nociceptive properties of dural afferent neurons would contribute to understand the pathophysiology of primary headaches.
Collapse
Affiliation(s)
- Michiko Nakamura
- Department of Pharmacology, School of Dentistry, Kyungpook National University, Daegu 41940, Republic of Korea; Brain Science & Engineering Institute, Kyungpook National University, Daegu 41940, Republic of Korea
| | - Il-Sung Jang
- Department of Pharmacology, School of Dentistry, Kyungpook National University, Daegu 41940, Republic of Korea; Brain Science & Engineering Institute, Kyungpook National University, Daegu 41940, Republic of Korea.
| |
Collapse
|
102
|
De Col R, Messlinger K, Hoffmann T. Differential conduction and CGRP release in visceral versus cutaneous peripheral nerves in the mouse. J Neurosci Res 2018; 96:1398-1405. [DOI: 10.1002/jnr.24255] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 03/23/2018] [Accepted: 04/16/2018] [Indexed: 01/05/2023]
Affiliation(s)
- Roberto De Col
- Institute for Physiology and Pathophysiology; University of Erlangen-Nuremberg; Erlangen Germany
| | - Karl Messlinger
- Institute for Physiology and Pathophysiology; University of Erlangen-Nuremberg; Erlangen Germany
| | - Tali Hoffmann
- Institute for Physiology and Pathophysiology; University of Erlangen-Nuremberg; Erlangen Germany
| |
Collapse
|
103
|
Wang G, Long C, Liu W, Xu C, Zhang M, Li Q, Lu Q, Meng P, Li D, Rong M, Sun Z, Luo X, Lai R. Novel Sodium Channel Inhibitor From Leeches. Front Pharmacol 2018; 9:186. [PMID: 29559913 PMCID: PMC5845541 DOI: 10.3389/fphar.2018.00186] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Accepted: 02/19/2018] [Indexed: 12/16/2022] Open
Abstract
Considering blood-sucking habits of leeches from surviving strategy of view, it can be hypothesized that leech saliva has analgesia or anesthesia functions for leeches to stay undetected by the host. However, no specific substance with analgesic function has been reported from leech saliva although clinical applications strongly indicated that leech therapy produces a strong and long lasting pain-reducing effect. Herein, a novel family of small peptides (HSTXs) including 11 members which show low similarity with known peptides was identified from salivary glands of the leech Haemadipsa sylvestris. A typical HSTX is composed of 22-25 amino acid residues including four half-cysteines, forming two intra-molecular disulfide bridges, and an amidated C-terminus. HSTX-I exerts significant analgesic function by specifically inhibiting voltage-gated sodium (NaV) channels (NaV1.8 and NaV1.9) which contribute to action potential electrogenesis in neurons and potential targets to develop analgesics. This study reveals that sodium channel inhibitors are analgesic substances in the leech. HSTXs are excellent candidates or templates for development of analgesics.
Collapse
Affiliation(s)
- Gan Wang
- Key Laboratory of Bioactive Peptides of Yunnan Province/Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences, Kunming Institute of Zoology, Kunming, China
| | - Chengbo Long
- Key Laboratory of Bioactive Peptides of Yunnan Province/Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences, Kunming Institute of Zoology, Kunming, China
| | - Weihui Liu
- Key Laboratory of Bioactive Peptides of Yunnan Province/Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences, Kunming Institute of Zoology, Kunming, China
| | - Cheng Xu
- Key Laboratory of Bioactive Peptides of Yunnan Province/Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences, Kunming Institute of Zoology, Kunming, China
| | - Min Zhang
- Key Laboratory of Bioactive Peptides of Yunnan Province/Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences, Kunming Institute of Zoology, Kunming, China.,Graduate School of University of Chinese Academy of Sciences, Beijing, China
| | - Qiong Li
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Qiumin Lu
- Key Laboratory of Bioactive Peptides of Yunnan Province/Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences, Kunming Institute of Zoology, Kunming, China.,Sino-African Joint Research Center, Chinese Academy of Sciences, Wuhan, China
| | - Ping Meng
- Key Laboratory of Bioactive Peptides of Yunnan Province/Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences, Kunming Institute of Zoology, Kunming, China
| | - Dongsheng Li
- Key Laboratory of Bioactive Peptides of Yunnan Province/Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences, Kunming Institute of Zoology, Kunming, China
| | - Mingqiang Rong
- Key Laboratory of Bioactive Peptides of Yunnan Province/Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences, Kunming Institute of Zoology, Kunming, China.,Sino-African Joint Research Center, Chinese Academy of Sciences, Wuhan, China
| | - Zhaohui Sun
- Department of Clinical Laboratory, Guangzhou General Hospital of Guangzhou Military Command of PLA, Guangzhou, China
| | - Xiaodong Luo
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Ren Lai
- Key Laboratory of Bioactive Peptides of Yunnan Province/Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Sciences, Kunming Institute of Zoology, Kunming, China.,Life Sciences College of Nanjing Agricultural University, Nanjing, China
| |
Collapse
|
104
|
Erickson A, Deiteren A, Harrington AM, Garcia‐Caraballo S, Castro J, Caldwell A, Grundy L, Brierley SM. Voltage-gated sodium channels: (Na V )igating the field to determine their contribution to visceral nociception. J Physiol 2018; 596:785-807. [PMID: 29318638 PMCID: PMC5830430 DOI: 10.1113/jp273461] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Accepted: 01/02/2018] [Indexed: 12/19/2022] Open
Abstract
Chronic visceral pain, altered motility and bladder dysfunction are common, yet poorly managed symptoms of functional and inflammatory disorders of the gastrointestinal and urinary tracts. Recently, numerous human channelopathies of the voltage-gated sodium (NaV ) channel family have been identified, which induce either painful neuropathies, an insensitivity to pain, or alterations in smooth muscle function. The identification of these disorders, in addition to the recent utilisation of genetically modified NaV mice and specific NaV channel modulators, has shed new light on how NaV channels contribute to the function of neuronal and non-neuronal tissues within the gastrointestinal tract and bladder. Here we review the current pre-clinical and clinical evidence to reveal how the nine NaV channel family members (NaV 1.1-NaV 1.9) contribute to abdominal visceral function in normal and disease states.
Collapse
Affiliation(s)
- Andelain Erickson
- Visceral Pain Research Group, Human Physiology, Centre for Neuroscience, College of Medicine and Public HealthFlinders UniversityBedford ParkSouth Australia5042Australia
- Centre for Nutrition and Gastrointestinal Diseases, Discipline of Medicine, University of AdelaideSouth Australian Health and Medical Research Institute (SAHMRI)North TerraceAdelaideSouth Australia 5000Australia
| | - Annemie Deiteren
- Visceral Pain Research Group, Human Physiology, Centre for Neuroscience, College of Medicine and Public HealthFlinders UniversityBedford ParkSouth Australia5042Australia
- Centre for Nutrition and Gastrointestinal Diseases, Discipline of Medicine, University of AdelaideSouth Australian Health and Medical Research Institute (SAHMRI)North TerraceAdelaideSouth Australia 5000Australia
| | - Andrea M. Harrington
- Visceral Pain Research Group, Human Physiology, Centre for Neuroscience, College of Medicine and Public HealthFlinders UniversityBedford ParkSouth Australia5042Australia
- Centre for Nutrition and Gastrointestinal Diseases, Discipline of Medicine, University of AdelaideSouth Australian Health and Medical Research Institute (SAHMRI)North TerraceAdelaideSouth Australia 5000Australia
| | - Sonia Garcia‐Caraballo
- Visceral Pain Research Group, Human Physiology, Centre for Neuroscience, College of Medicine and Public HealthFlinders UniversityBedford ParkSouth Australia5042Australia
- Centre for Nutrition and Gastrointestinal Diseases, Discipline of Medicine, University of AdelaideSouth Australian Health and Medical Research Institute (SAHMRI)North TerraceAdelaideSouth Australia 5000Australia
| | - Joel Castro
- Visceral Pain Research Group, Human Physiology, Centre for Neuroscience, College of Medicine and Public HealthFlinders UniversityBedford ParkSouth Australia5042Australia
- Centre for Nutrition and Gastrointestinal Diseases, Discipline of Medicine, University of AdelaideSouth Australian Health and Medical Research Institute (SAHMRI)North TerraceAdelaideSouth Australia 5000Australia
| | - Ashlee Caldwell
- Visceral Pain Research Group, Human Physiology, Centre for Neuroscience, College of Medicine and Public HealthFlinders UniversityBedford ParkSouth Australia5042Australia
- Centre for Nutrition and Gastrointestinal Diseases, Discipline of Medicine, University of AdelaideSouth Australian Health and Medical Research Institute (SAHMRI)North TerraceAdelaideSouth Australia 5000Australia
| | - Luke Grundy
- Visceral Pain Research Group, Human Physiology, Centre for Neuroscience, College of Medicine and Public HealthFlinders UniversityBedford ParkSouth Australia5042Australia
- Centre for Nutrition and Gastrointestinal Diseases, Discipline of Medicine, University of AdelaideSouth Australian Health and Medical Research Institute (SAHMRI)North TerraceAdelaideSouth Australia 5000Australia
| | - Stuart M. Brierley
- Visceral Pain Research Group, Human Physiology, Centre for Neuroscience, College of Medicine and Public HealthFlinders UniversityBedford ParkSouth Australia5042Australia
- Centre for Nutrition and Gastrointestinal Diseases, Discipline of Medicine, University of AdelaideSouth Australian Health and Medical Research Institute (SAHMRI)North TerraceAdelaideSouth Australia 5000Australia
| |
Collapse
|
105
|
Wu Y, Ma H, Zhang F, Zhang C, Zou X, Cao Z. Selective Voltage-Gated Sodium Channel Peptide Toxins from Animal Venom: Pharmacological Probes and Analgesic Drug Development. ACS Chem Neurosci 2018; 9:187-197. [PMID: 29161016 DOI: 10.1021/acschemneuro.7b00406] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Voltage-gated sodium channels (Navs) play critical roles in action potential generation and propagation. Nav channelopathy as well as pathological sensitization contribute to allodynia and hyperalgesia. Recent evidence has demonstrated the significant roles of Nav subtypes (Nav1.3, 1.7, 1.8, and 1.9) in nociceptive transduction, and therefore these Navs may represent attractive targets for analgesic drug discovery. Animal toxins are structurally diverse peptides that are highly potent yet selective on ion channel subtypes and therefore represent valuable probes to elucidate the structures, gating properties, and cellular functions of ion channels. In this review, we summarize recent advances on peptide toxins from animal venom that selectively target Nav1.3, 1.7, 1.8, and 1.9, along with their potential in analgesic drug discovery.
Collapse
Affiliation(s)
- Ying Wu
- Jiangsu Provincial Key Laboratory for TCM Evaluation
and Translational Development, China Pharmaceutical University, Nanjing 211198, China
| | - Hui Ma
- Jiangsu Provincial Key Laboratory for TCM Evaluation
and Translational Development, China Pharmaceutical University, Nanjing 211198, China
| | - Fan Zhang
- Jiangsu Provincial Key Laboratory for TCM Evaluation
and Translational Development, China Pharmaceutical University, Nanjing 211198, China
| | - Chunlei Zhang
- Jiangsu Provincial Key Laboratory for TCM Evaluation
and Translational Development, China Pharmaceutical University, Nanjing 211198, China
| | - Xiaohan Zou
- Jiangsu Provincial Key Laboratory for TCM Evaluation
and Translational Development, China Pharmaceutical University, Nanjing 211198, China
| | - Zhengyu Cao
- Jiangsu Provincial Key Laboratory for TCM Evaluation
and Translational Development, China Pharmaceutical University, Nanjing 211198, China
| |
Collapse
|
106
|
Duan G, Sun J, Li N, Zheng H, Guo S, Zhang Y, Wang Q, Ying Y, Zhang M, Huang P, Zhang X. A variant in the SCN10A enhancer may affect human mechanical pain sensitivity. Mol Pain 2018; 14:1744806918763275. [PMID: 29448912 PMCID: PMC5858611 DOI: 10.1177/1744806918763275] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Expression of Nav1.8, encoded by SCN10A, can affect pain transmission and thus mediate the human pain phenotype. In the current study, we assessed whether the variant rs6801957, located in the SCN10A enhancer region, may have the potential to affect human pain. Through dual-luciferase reporter assays in 293T cells, we found that the SCN10A enhancer A (Enh-A) increased the activity of the SCN10A promoter ( P < 0.05). Additionally, in a cohort of 309 healthy women, mutant rs6801957 A/A was found to have a significant association with decreased human experimental mechanical pain sensitivity ( P < 0.05). We then found that mutant genotype A/A suppressed the increased effect of Enh-A compared with wild-type G/G ( P < 0.05). The association between rs6801957 and human experimental mechanical pain sensitivity was further validated in a larger cohort of 1005 women ( P < 0.05). In conclusion, these results demonstrated that the variant rs6801957 and Enh-A may affect SCN10A gene expression and play an important role in human mechanical pain sensitivity.
Collapse
Affiliation(s)
- Guangyou Duan
- 1 Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Jiaoli Sun
- 1 Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Ningbo Li
- 1 Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Hua Zheng
- 1 Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Shanna Guo
- 1 Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Yuhao Zhang
- 1 Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Qingli Wang
- 1 Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Ying Ying
- 1 Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Mi Zhang
- 1 Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Penghao Huang
- 1 Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Xianwei Zhang
- 1 Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| |
Collapse
|
107
|
Changes in the expression of voltage-gated sodium channels Nav1.3, Nav1.7, Nav1.8, and Nav1.9 in rat trigeminal ganglia following chronic constriction injury. Neuroreport 2018; 27:929-34. [PMID: 27327156 DOI: 10.1097/wnr.0000000000000632] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Voltage-gated sodium channels (VGSCs), especially the tetrodotoxin-sensitive Nav1.3 and Nav1.7, and the tetrodotoxin-resistant Nav1.8 and Nav1.9, have been implicated in acute and chronic neuropathic pain. The aim of this study was to investigate the expression of VGSC Nav1.3, Nav1.7, Nav1.8, and Nav1.9 after nerve injury and their roles in the development of trigeminal neuralgia (TN). We used the infraorbital nerve-chronic constriction injury model of TN in the rat. The time course of changes in the mechanical pain threshold was examined. In addition, real-time PCR and double immunofluorescence staining of VGSC α subunits were used to evaluate messenger RNA and protein expression, respectively, in the trigeminal ganglion. Behavioral tests showed that the mechanical pain threshold decreased significantly 4-42 days after surgery and reached the lowest observed value by day 12. Compared with sham-operated controls, we found that trigeminal ganglion in rats subjected to an infraorbital nerve-chronic constriction injury showed upregulation of Nav1.3 and downregulation of Nav1.7, Nav1.8, and Nav1.9 messenger RNA and protein levels. Our findings suggest that VGSC may participate in the regulation of TN.
Collapse
|
108
|
Zhu TH, Ding SJ, Li TT, Zhu LB, Huang XF, Zhang XM. Estrogen is an important mediator of mast cell activation in ovarian endometriomas. Reproduction 2018; 155:73-83. [DOI: 10.1530/rep-17-0457] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 09/26/2017] [Accepted: 10/26/2017] [Indexed: 01/21/2023]
Abstract
Endometriosis is an estrogen-dependent disease. Previous research has shown that abnormal enzymes associated with estrogen (E2) metabolism and an increased number of mast cells (MCs) in endometriomas are implicated in the pathogenesis of endometriosis. However, it remains unclear how MCs mediate the role of E2 in endometriosis. Accordingly, we investigated whether E2 was associated with the number of MCs, and the rate of degranulation, in local ovarian endometriomas, as well as the role of E2 on MCs during the pathogenesis of endometriosis. Using enzyme-linked immunosorbent assay and immunohistochemistry, we found that concentrations of E2, and the number and activity of MCs, were significantly higher in ovarian endometriomas than in controls, and that these parameters were correlated with the severity of endometriosis-associated dysmenorrhea. By measuring the release of hexosaminidase, we found that the rate of RBL2H3 cell degranulation increased after E2 treatment. Furthermore, activation of RBL2H3 cells by E2 was found to trigger the release of biologically active nerve growth factor, which promotes neurite outgrowth in PC12 cells and also sensitizes dorsal root ganglion cells via upregulation ofNav1.8and transient receptor potential cation channel (subfamily V member 1) expression levels. When treated with E2, endometriotic cells could promote RBL2H3 cell recruitment by upregulating expression levels of stem cell factor, transforming growth factor-β and monocyte chemoattractant protein-1; these observations were not evident with control endometrial cells. Thus, elevated E2 concentrations may be a key factor for degranulation and recruitment of MCs in ovarian endometriomas, which play a key role in endometriosis-associated dysmenorrhea.
Collapse
|
109
|
|
110
|
Tosti E, Boni R, Gallo A. µ-Conotoxins Modulating Sodium Currents in Pain Perception and Transmission: A Therapeutic Potential. Mar Drugs 2017; 15:E295. [PMID: 28937587 PMCID: PMC5666403 DOI: 10.3390/md15100295] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 09/12/2017] [Accepted: 09/20/2017] [Indexed: 12/27/2022] Open
Abstract
The Conus genus includes around 500 species of marine mollusks with a peculiar production of venomous peptides known as conotoxins (CTX). Each species is able to produce up to 200 different biological active peptides. Common structure of CTX is the low number of amino acids stabilized by disulfide bridges and post-translational modifications that give rise to different isoforms. µ and µO-CTX are two isoforms that specifically target voltage-gated sodium channels. These, by inducing the entrance of sodium ions in the cell, modulate the neuronal excitability by depolarizing plasma membrane and propagating the action potential. Hyperexcitability and mutations of sodium channels are responsible for perception and transmission of inflammatory and neuropathic pain states. In this review, we describe the current knowledge of µ-CTX interacting with the different sodium channels subtypes, the mechanism of action and their potential therapeutic use as analgesic compounds in the clinical management of pain conditions.
Collapse
Affiliation(s)
- Elisabetta Tosti
- Department of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Naples, Italy.
| | - Raffaele Boni
- Department of Sciences, University of Basilicata, 75100 Potenza, Italy.
| | - Alessandra Gallo
- Department of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Naples, Italy.
| |
Collapse
|
111
|
Abstract
Abstract
Painful stimuli are detected by specialized neurons, nociceptors, and are translated into action potentials, that are conducted along afferent pathways into the central nervous system, where they are conceived as pain. Voltage-gated sodium channels (NaV channels) are of paramount importance for nociceptor function, as they are responsible for the generation of action potentials and for their directed propagation. The exceptional role of sodium channel subtypes NaV1.7, NaV1.8 and NaV1.9 in the transmission of nociceptive signals has been emphasized by a variety of studies that associated genetically-induced malfunction of these channels with various pain diseases. In the following, structure and function of subtypes NaV1.7, NaV1.8 und NaV1.9 are briefly reviewed, associated pain diseases are introduced and current and future NaV-based strategies for the treatment of pain are discussed.
Collapse
Affiliation(s)
- Carla Nau
- Department of Anesthesiology and Intensive Care , University Medical Center Schleswig-Holstein, Campus Luebeck , Ratzeburger Allee 160, 23538 Luebeck , Germany , Phone: +49 451 50040701, Fax: +49 451 50040704
| | - Enrico Leipold
- Center for Molecular Biomedicine , Department of Biophysics, Friedrich Schiller University Jena , Hans-Knoell-St. 2, 07745 Jena , Germany , Phone: +49 3641 9395654, Fax: +49 3641 9395652
| |
Collapse
|
112
|
Action Potential Broadening in Capsaicin-Sensitive DRG Neurons from Frequency-Dependent Reduction of Kv3 Current. J Neurosci 2017; 37:9705-9714. [PMID: 28877968 DOI: 10.1523/jneurosci.1703-17.2017] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 08/29/2017] [Accepted: 08/30/2017] [Indexed: 11/21/2022] Open
Abstract
Action potential (AP) shape is a key determinant of cellular electrophysiological behavior. We found that in small-diameter, capsaicin-sensitive dorsal root ganglia neurons corresponding to nociceptors (from rats of either sex), stimulation at frequencies as low as 1 Hz produced progressive broadening of the APs. Stimulation at 10 Hz for 3 s resulted in an increase in AP width by an average of 76 ± 7% at 22°C and by 38 ± 3% at 35°C. AP clamp experiments showed that spike broadening results from frequency-dependent reduction of potassium current during spike repolarization. The major current responsible for frequency-dependent reduction of overall spike-repolarizing potassium current was identified as Kv3 current by its sensitivity to low concentrations of 4-aminopyridine (IC50 <100 μm) and block by the peptide inhibitor blood depressing substance I (BDS-I). There was a small component of Kv1-mediated current during AP repolarization, but this current did not show frequency-dependent reduction. In a small fraction of cells, there was a component of calcium-dependent potassium current that showed frequency-dependent reduction, but the contribution to overall potassium current reduction was almost always much smaller than that of Kv3-mediated current. These results show that Kv3 channels make a major contribution to spike repolarization in small-diameter DRG neurons and undergo frequency-dependent reduction, leading to spike broadening at moderate firing frequencies. Spike broadening from frequency-dependent reduction in Kv3 current could mitigate the frequency-dependent decreases in conduction velocity typical of C-fiber axons.SIGNIFICANCE STATEMENT Small-diameter dorsal root ganglia (DRG) neurons mediating nociception and other sensory modalities express many types of potassium channels, but how they combine to control firing patterns and conduction is not well understood. We found that action potentials of small-diameter rat DRG neurons showed spike broadening at frequencies as low as 1 Hz and that spike broadening resulted predominantly from frequency-dependent inactivation of Kv3 channels. Spike width helps to control transmitter release, conduction velocity, and firing patterns and understanding the role of particular potassium channels can help to guide new pharmacological strategies for targeting pain-sensing neurons selectively.
Collapse
|
113
|
Ciguatoxins Evoke Potent CGRP Release by Activation of Voltage-Gated Sodium Channel Subtypes Na V1.9, Na V1.7 and Na V1.1. Mar Drugs 2017; 15:md15090269. [PMID: 28867800 PMCID: PMC5618408 DOI: 10.3390/md15090269] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 08/04/2017] [Accepted: 08/16/2017] [Indexed: 02/03/2023] Open
Abstract
Ciguatoxins (CTXs) are marine toxins that cause ciguatera fish poisoning, a debilitating disease dominated by sensory and neurological disturbances that include cold allodynia and various painful symptoms as well as long-lasting pruritus. Although CTXs are known as the most potent mammalian sodium channel activator toxins, the etiology of many of its neurosensory symptoms remains unresolved. We recently described that local application of 1 nM Pacific Ciguatoxin-1 (P-CTX-1) into the skin of human subjects induces a long-lasting, painful axon reflex flare and that CTXs are particularly effective in releasing calcitonin-gene related peptide (CGRP) from nerve terminals. In this study, we used mouse and rat skin preparations and enzyme-linked immunosorbent assays (ELISA) to study the molecular mechanism by which P-CTX-1 induces CGRP release. We show that P-CTX-1 induces CGRP release more effectively in mouse as compared to rat skin, exhibiting EC50 concentrations in the low nanomolar range. P-CTX-1-induced CGRP release from skin is dependent on extracellular calcium and sodium, but independent from the activation of various thermosensory transient receptor potential (TRP) ion channels. In contrast, lidocaine and tetrodotoxin (TTX) reduce CGRP release by 53–75%, with the remaining fraction involving L-type and T-type voltage-gated calcium channels (VGCC). Using transgenic mice, we revealed that the TTX-resistant voltage-gated sodium channel (VGSC) NaV1.9, but not NaV1.8 or NaV1.7 alone and the combined activation of the TTX-sensitive VGSC subtypes NaV1.7 and NaV1.1 carry the largest part of the P-CTX-1-caused CGRP release of 42% and 34%, respectively. Given the contribution of CGRP to nociceptive and itch sensing pathways, our findings contribute to a better understanding of sensory symptoms of acute and chronic ciguatera that may help in the identification of potential therapeutics.
Collapse
|
114
|
Abstract
Fibromyalgia appears to present in subgroups with regard to biological pain induction, with primarily inflammatory, neuropathic/neurodegenerative, sympathetic, oxidative, nitrosative, or muscular factors and/or central sensitization. Recent research has also discussed glial activation or interrupted dopaminergic neurotransmission, as well as increased skin mast cells and mitochondrial dysfunction. Therapy is difficult, and the treatment options used so far mostly just have the potential to address only one of these aspects. As ambroxol addresses all of them in a single substance and furthermore also reduces visceral hypersensitivity, in fibromyalgia existing as irritable bowel syndrome or chronic bladder pain, it should be systematically investigated for this purpose. Encouraged by first clinical observations of two working groups using topical or oral ambroxol for fibromyalgia treatments, the present paper outlines the scientific argument for this approach by looking at each of the aforementioned aspects of this complex disease and summarizes putative modes of action of ambroxol. Nevertheless, at this point the evidence basis for ambroxol is not strong enough for clinical recommendation.
Collapse
Affiliation(s)
- Kai-Uwe Kern
- Institute of Pain Medicine/Pain Practice, Wiesbaden, Germany
| | | |
Collapse
|
115
|
Huang J, Vanoye CG, Cutts A, Goldberg YP, Dib-Hajj SD, Cohen CJ, Waxman SG, George AL. Sodium channel NaV1.9 mutations associated with insensitivity to pain dampen neuronal excitability. J Clin Invest 2017; 127:2805-2814. [PMID: 28530638 DOI: 10.1172/jci92373] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 03/23/2017] [Indexed: 02/05/2023] Open
Abstract
Voltage-gated sodium channel (NaV) mutations cause genetic pain disorders that range from severe paroxysmal pain to a congenital inability to sense pain. Previous studies on NaV1.7 and NaV1.8 established clear relationships between perturbations in channel function and divergent clinical phenotypes. By contrast, studies of NaV1.9 mutations have not revealed a clear relationship of channel dysfunction with the associated and contrasting clinical phenotypes. Here, we have elucidated the functional consequences of a NaV1.9 mutation (L1302F) that is associated with insensitivity to pain. We investigated the effects of L1302F and a previously reported mutation (L811P) on neuronal excitability. In transfected heterologous cells, the L1302F mutation caused a large hyperpolarizing shift in the voltage-dependence of activation, leading to substantially enhanced overlap between activation and steady-state inactivation relationships. In transfected small rat dorsal root ganglion neurons, expression of L1302F and L811P evoked large depolarizations of the resting membrane potential and impaired action potential generation. Therefore, our findings implicate a cellular loss of function as the basis for impaired pain sensation. We further demonstrated that a U-shaped relationship between the resting potential and the neuronal action potential threshold explains why NaV1.9 mutations that evoke small degrees of membrane depolarization cause hyperexcitability and familial episodic pain disorder or painful neuropathy, while mutations evoking larger membrane depolarizations cause hypoexcitability and insensitivity to pain.
Collapse
Affiliation(s)
- Jianying Huang
- Department of Neurology and Center for Neuroscience and Regeneration Research, Yale University School of Medicine; and Rehabilitation Research Center, Veterans Administration Connecticut Healthcare System, West Haven, Connecticut, USA
| | - Carlos G Vanoye
- Department of Pharmacology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Alison Cutts
- Xenon Pharmaceuticals, Burnaby, British Columbia, Canada
| | | | - Sulayman D Dib-Hajj
- Department of Neurology and Center for Neuroscience and Regeneration Research, Yale University School of Medicine; and Rehabilitation Research Center, Veterans Administration Connecticut Healthcare System, West Haven, Connecticut, USA
| | | | - Stephen G Waxman
- Department of Neurology and Center for Neuroscience and Regeneration Research, Yale University School of Medicine; and Rehabilitation Research Center, Veterans Administration Connecticut Healthcare System, West Haven, Connecticut, USA
| | - Alfred L George
- Department of Pharmacology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| |
Collapse
|
116
|
Kornecook TJ, Yin R, Altmann S, Be X, Berry V, Ilch CP, Jarosh M, Johnson D, Lee JH, Lehto SG, Ligutti J, Liu D, Luther J, Matson D, Ortuno D, Roberts J, Taborn K, Wang J, Weiss MM, Yu V, Zhu DXD, Fremeau RT, Moyer BD. Pharmacologic Characterization of AMG8379, a Potent and Selective Small Molecule Sulfonamide Antagonist of the Voltage-Gated Sodium Channel NaV1.7. J Pharmacol Exp Ther 2017; 362:146-160. [DOI: 10.1124/jpet.116.239590] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 05/03/2017] [Indexed: 02/05/2023] Open
|
117
|
Sodium Channel Na v1.8 Underlies TTX-Resistant Axonal Action Potential Conduction in Somatosensory C-Fibers of Distal Cutaneous Nerves. J Neurosci 2017; 37:5204-5214. [PMID: 28450535 DOI: 10.1523/jneurosci.3799-16.2017] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Revised: 04/03/2017] [Accepted: 04/04/2017] [Indexed: 12/19/2022] Open
Abstract
Voltage-gated sodium (NaV) channels are responsible for the initiation and conduction of action potentials within primary afferents. The nine NaV channel isoforms recognized in mammals are often functionally divided into tetrodotoxin (TTX)-sensitive (TTX-s) channels (NaV1.1-NaV1.4, NaV1.6-NaV1.7) that are blocked by nanomolar concentrations and TTX-resistant (TTX-r) channels (NaV1.8 and NaV1.9) inhibited by millimolar concentrations, with NaV1.5 having an intermediate toxin sensitivity. For small-diameter primary afferent neurons, it is unclear to what extent different NaV channel isoforms are distributed along the peripheral and central branches of their bifurcated axons. To determine the relative contribution of TTX-s and TTX-r channels to action potential conduction in different axonal compartments, we investigated the effects of TTX on C-fiber-mediated compound action potentials (C-CAPs) of proximal and distal peripheral nerve segments and dorsal roots from mice and pigtail monkeys (Macaca nemestrina). In the dorsal roots and proximal peripheral nerves of mice and nonhuman primates, TTX reduced the C-CAP amplitude to 16% of the baseline. In contrast, >30% of the C-CAP was resistant to TTX in distal peripheral branches of monkeys and WT and NaV1.9-/- mice. In nerves from NaV1.8-/- mice, TTX-r C-CAPs could not be detected. These data indicate that NaV1.8 is the primary isoform underlying TTX-r conduction in distal axons of somatosensory C-fibers. Furthermore, there is a differential spatial distribution of NaV1.8 within C-fiber axons, being functionally more prominent in the most distal axons and terminal regions. The enrichment of NaV1.8 in distal axons may provide a useful target in the treatment of pain of peripheral origin.SIGNIFICANCE STATEMENT It is unclear whether individual sodium channel isoforms exert differential roles in action potential conduction along the axonal membrane of nociceptive, unmyelinated peripheral nerve fibers, but clarifying the role of sodium channel subtypes in different axonal segments may be useful for the development of novel analgesic strategies. Here, we provide evidence from mice and nonhuman primates that a substantial portion of the C-fiber compound action potential in distal peripheral nerves, but not proximal nerves or dorsal roots, is resistant to tetrodotoxin and that, in mice, this effect is mediated solely by voltage-gated sodium channel 1.8 (NaV1.8). The functional prominence of NaV1.8 within the axonal compartment immediately proximal to its termination may affect strategies targeting pain of peripheral origin.
Collapse
|
118
|
Yu L, Wang M, Hu D, Huang B, Zhou L, Zhou X, Wang Z, Wang S, Jiang H. Blocking the Nav1.8 channel in the left stellate ganglion suppresses ventricular arrhythmia induced by acute ischemia in a canine model. Sci Rep 2017; 7:534. [PMID: 28373696 PMCID: PMC5428783 DOI: 10.1038/s41598-017-00642-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Accepted: 03/07/2017] [Indexed: 01/01/2023] Open
Abstract
Left stellate ganglion (LSG) hyperactivity promotes ischemia induced ventricular arrhythmia (VA). Blocking the Nav1.8 channel decreases neuron activity. Therefore, the present study aimed to investigate whether blocking the Nav1.8 channel with its specific blocker A-803467 in the LSG reduces sympathetic activity and exerts anti-arrhythmic effects. Forty canines were divided into dimethylsulfoxide (DMSO) group and 10 mM, 15 mM, and 20 mM A-803467 groups. A volume of 0.1 ml of A-803467 or DMSO was injected into the LSG. The ventricular electrophysiological parameters, LSG function were measured before and 30 min after the injection. VA was assessed for 60 min after ischemia and then LSG tissues were collected for molecular biological experiments. Compared with DMSO, concentration-dependent prolonged action potential duration and effective refractory period, decreased LSG function were identified after A-803467 treatment. Moreover, the severity of ischemia induced VA was decreased in A-803467 groups. Furthermore, decreased nerve growth factor, decreased c-fos and increased sympathetic neuron apoptosis were found in the LSG after A-803467 injection. In conclusion, blocking the Nav1.8 channel could significantly attenuate ischemia-induced VA, primarily by suppressing LSG activity.
Collapse
Affiliation(s)
- Lilei Yu
- Department of Cardiology, Renmin Hospital of Wuhan University, Cardiovascular Research Institute, Wuhan University, Hubei Key Laboratory of Cardiology, Wuhan, China
| | - Menglong Wang
- Department of Cardiology, Renmin Hospital of Wuhan University, Cardiovascular Research Institute, Wuhan University, Hubei Key Laboratory of Cardiology, Wuhan, China
| | - Dan Hu
- Department of Cardiology, Renmin Hospital of Wuhan University, Cardiovascular Research Institute, Wuhan University, Hubei Key Laboratory of Cardiology, Wuhan, China.,Masonic Medical Research Laboratory, 2150 Bleecker Street, Utica, New York, 13501-1787, USA
| | - Bing Huang
- Department of Cardiology, Renmin Hospital of Wuhan University, Cardiovascular Research Institute, Wuhan University, Hubei Key Laboratory of Cardiology, Wuhan, China
| | - Liping Zhou
- Department of Cardiology, Renmin Hospital of Wuhan University, Cardiovascular Research Institute, Wuhan University, Hubei Key Laboratory of Cardiology, Wuhan, China
| | - Xiaoya Zhou
- Department of Cardiology, Renmin Hospital of Wuhan University, Cardiovascular Research Institute, Wuhan University, Hubei Key Laboratory of Cardiology, Wuhan, China
| | - Zhuo Wang
- Department of Cardiology, Renmin Hospital of Wuhan University, Cardiovascular Research Institute, Wuhan University, Hubei Key Laboratory of Cardiology, Wuhan, China
| | - Songyun Wang
- Department of Cardiology, Renmin Hospital of Wuhan University, Cardiovascular Research Institute, Wuhan University, Hubei Key Laboratory of Cardiology, Wuhan, China
| | - Hong Jiang
- Department of Cardiology, Renmin Hospital of Wuhan University, Cardiovascular Research Institute, Wuhan University, Hubei Key Laboratory of Cardiology, Wuhan, China.
| |
Collapse
|
119
|
Abstract
Purpose of Review Topical therapeutic approaches in localized neuropathic pain (LNP) syndromes are increasingly used by both specialists and general practitioners, with a potentially promising effect on pain reduction. In this narrative review, we describe the available compounds for topical use in LNP syndromes and address their potential efficacy according to the literature. Recent Findings Local anaesthetics (e.g., lidocaine, bupivacaine and mepivacaine), as well as general anaesthetic agents (e.g., ketamine), muscle relaxants (e.g., baclofen), capsaicin, anti-inflammatory drugs (e.g., diclofenac), salicylates, antidepressants (e.g., amitriptyline and doxepin), α2 adrenergic agents (e.g., clonidine), or even a combination of them have been tested in various applications for the treatment of LNP. Few of them have reached a sufficient level of evidence to support systematic use as treatment options. Summary Relatively few systemic side effects or drug–drug interactions and satisfactory efficacy seem to be the benefits of topical treatments. More well-organized and tailored studies are necessary for the further conceptualization of topical treatments for LNP.
Collapse
Affiliation(s)
- Roberto Casale
- Department of High Technology Rehabilitation & Pain Rehabilitation Unit, Habilita Care and Research Hospitals, Via Bologna 1-24040, Zingonia di Ciserano (BG), Italy.
| | - Z Symeonidou
- Department of High Technology Rehabilitation & Pain Rehabilitation Unit, Habilita Care and Research Hospitals, Via Bologna 1-24040, Zingonia di Ciserano (BG), Italy.,Department of Physical and Rehabilitation Medicine, General Hospital of Attica "KAT", Athens, Greece
| | - M Bartolo
- Department of Rehabilitation, Neurorehabilitation Unit, Habilita, Zingonia di Ciserano (BG), Italy
| |
Collapse
|
120
|
Kern KU, Weiser T. Topical ambroxol for the treatment of neuropathic pain. An initial clinical observation. Schmerz 2017; 29 Suppl 3:S89-96. [PMID: 26589711 PMCID: PMC4701773 DOI: 10.1007/s00482-015-0060-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Neuropathic pain is difficult to treat, and the available options are often inadequate. The expectorant ambroxol also acts as a strong local anaesthetic and blocks sodium channels about 40 times more potently than lidocaine. It preferentially inhibits the channel subtype Nav 1.8, which is expressed especially in nociceptive C-fibres. In view of the low toxicity of ambroxol, it seemed reasonable to try using it for the treatment of neuropathic pain that failed to respond to other standard options. MATERIAL AND METHODS The medical records of seven patients with severe neuropathic pain and pain reduction following topical ambroxol treatment are reported retrospectively. As standard therapies had not proved sufficient, a topical ambroxol 20% cream was repeatedly applied by the patients in the area of neuropathic pain. RESULTS The reasons for neuropathic pain were postherpetic neuralgia (2 ×), mononeuropathy multiplex, phantom pain, deafferentation pain, postoperative neuralgia and foot neuropathy of unknown origin. The individual mean pain intensity reported was between 4 and 6/10 (NRS), maximum pain at 6-10/10 (NRS). The pain reduction achieved individually following ambroxol cream was 2-8 points (NRS) within 5-30 min and lasted for 3-8 h. Pain attacks were reduced in all five patients presenting with this problem. Four patients with no improvement after lidocaine 5% and one patient with no response to capsaicin 8% nevertheless experienced a pain reduction with topical ambroxol. No patient reported any side effects or skin changes during a treatment that has since been continued for up to 4 years. CONCLUSION Ambroxol acts as a strong local anaesthetic and preferentially inhibits the nociceptively relevant sodium channel subtype Nav 1.8. For the first time, we report below on a relevant pain relief following topical ambroxol 20% cream in patients with neuropathic pain. In view of the positive side effect profile, the clinical benefit in patients with pain should be investigated further.
Collapse
Affiliation(s)
- K-U Kern
- Institut für Schmerzmedizin/Schmerzpraxis Wiesbaden, Sonnenberger Str. 68, 65193, Wiesbaden, Germany.
| | - T Weiser
- Boehringer Ingelheim Pharma GmbH & Co. KG, Ingelheim, Germany
| |
Collapse
|
121
|
Kern KU, Weiser T. [Topical ambroxol for the treatment of neuropathic pain: A first clinical observation. German version]. Schmerz 2017; 29:632-40. [PMID: 26597641 DOI: 10.1007/s00482-015-0065-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
BACKGROUND Neuropathic pain is difficult to treat and available options are frequently not sufficient. The expectorant ambroxol also works as a strong local anesthetic and blocks sodium channels about 40 times more potently than lidocaine. Ambroxol preferentially inhibits the channel subtype Nav 1.8, which is expressed particularly in nociceptive C fibers. Due to the low toxicity, topical ambroxol seemed to represent a reasonable therapeutic attempt for treatment of neuropathic pain resistant to other standard options. MATERIALS AND METHODS Medical records of 7 patients with severe neuropathic pain, in whom many attempts at treatment with approved substances were not sufficient or possible, are reported retrospectively. Patients were then treated with topical ambroxol 20% cream applied in the area of neuropathic pain. RESULTS Causes of neuropathic pain were postherpetic neuralgia (2-×), mononeuropathy multiplex, phantom pain, deafferentation pain, postoperative neuralgia and an unclear allodynia of the foot. Mean pain intensity was reported as 4-6/10 on a numeric rating scale (NRS) and maximum pain intensity as 6-10/10. Pain reduction following ambroxol cream was 2-8 points (NRS) within 15-30 min and lasted 3-8 h. Pain attacks were reduced in all 5 patients presenting this problem. Topical ambroxol achieved pain reduction in 4 patients with no improvement after lidocaine 5% and 1 patient with no response to capsaicin 8%. No adverse events or skin changes have been observed, and the longest treatment duration is currently 4 years. CONCLUSION Ambroxol acts as a strong local anesthetic and preferentially inhibits the nociceptive-relevant sodium channel subtype Nav 1.8. For the first time, we report relevant pain reduction following topical Ambroxol 20% cream in patients with neuropathic pain. Regarding the advantageous profile with rare side effects, the clinical benefit for pain patients should be further investigated.
Collapse
Affiliation(s)
- K-U Kern
- Institut für Schmerzmedizin / Schmerzpraxis Wiesbaden, Wiesbaden, Deutschland. .,Boehringer Ingelheim Pharma GmbH & Co. KG, Ingelheim am Rhein, Deutschland.
| | - T Weiser
- Boehringer Ingelheim Pharma GmbH & Co. KG, Ingelheim am Rhein, Deutschland
| |
Collapse
|
122
|
Inserra MC, Israel MR, Caldwell A, Castro J, Deuis JR, Harrington AM, Keramidas A, Garcia-Caraballo S, Maddern J, Erickson A, Grundy L, Rychkov GY, Zimmermann K, Lewis RJ, Brierley SM, Vetter I. Multiple sodium channel isoforms mediate the pathological effects of Pacific ciguatoxin-1. Sci Rep 2017; 7:42810. [PMID: 28225079 PMCID: PMC5320492 DOI: 10.1038/srep42810] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Accepted: 01/13/2017] [Indexed: 01/04/2023] Open
Abstract
Human intoxication with the seafood poison ciguatoxin, a dinoflagellate polyether that activates voltage-gated sodium channels (NaV), causes ciguatera, a disease characterised by gastrointestinal and neurological disturbances. We assessed the activity of the most potent congener, Pacific ciguatoxin-1 (P-CTX-1), on NaV1.1–1.9 using imaging and electrophysiological approaches. Although P-CTX-1 is essentially a non-selective NaV toxin and shifted the voltage-dependence of activation to more hyperpolarising potentials at all NaV subtypes, an increase in the inactivation time constant was observed only at NaV1.8, while the slope factor of the conductance-voltage curves was significantly increased for NaV1.7 and peak current was significantly increased for NaV1.6. Accordingly, P-CTX-1-induced visceral and cutaneous pain behaviours were significantly decreased after pharmacological inhibition of NaV1.8 and the tetrodotoxin-sensitive isoforms NaV1.7 and NaV1.6, respectively. The contribution of these isoforms to excitability of peripheral C- and A-fibre sensory neurons, confirmed using murine skin and visceral single-fibre recordings, reflects the expression pattern of NaV isoforms in peripheral sensory neurons and their contribution to membrane depolarisation, action potential initiation and propagation.
Collapse
Affiliation(s)
- Marco C Inserra
- Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, 306 Carmody Rd, St Lucia, Queensland 4072, Australia
| | - Mathilde R Israel
- Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, 306 Carmody Rd, St Lucia, Queensland 4072, Australia
| | - Ashlee Caldwell
- Visceral Pain Group, South Australian Health and Medical Research Institute (SAHMRI), School of Medicine, Flinders University, Adelaide, South Australia 5000, Australia.,Centre for Nutrition and Gastrointestinal Diseases, Discipline of Medicine, University of Adelaide, South Australian Health and Medical Research Institute (SAHMRI), North Terrace, Adelaide, South Australia 5000, Australia
| | - Joel Castro
- Visceral Pain Group, South Australian Health and Medical Research Institute (SAHMRI), School of Medicine, Flinders University, Adelaide, South Australia 5000, Australia.,Centre for Nutrition and Gastrointestinal Diseases, Discipline of Medicine, University of Adelaide, South Australian Health and Medical Research Institute (SAHMRI), North Terrace, Adelaide, South Australia 5000, Australia
| | - Jennifer R Deuis
- Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, 306 Carmody Rd, St Lucia, Queensland 4072, Australia
| | - Andrea M Harrington
- Visceral Pain Group, South Australian Health and Medical Research Institute (SAHMRI), School of Medicine, Flinders University, Adelaide, South Australia 5000, Australia.,Centre for Nutrition and Gastrointestinal Diseases, Discipline of Medicine, University of Adelaide, South Australian Health and Medical Research Institute (SAHMRI), North Terrace, Adelaide, South Australia 5000, Australia
| | - Angelo Keramidas
- Queensland Brain Institute, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - Sonia Garcia-Caraballo
- Visceral Pain Group, South Australian Health and Medical Research Institute (SAHMRI), School of Medicine, Flinders University, Adelaide, South Australia 5000, Australia.,Centre for Nutrition and Gastrointestinal Diseases, Discipline of Medicine, University of Adelaide, South Australian Health and Medical Research Institute (SAHMRI), North Terrace, Adelaide, South Australia 5000, Australia
| | - Jessica Maddern
- Visceral Pain Group, South Australian Health and Medical Research Institute (SAHMRI), School of Medicine, Flinders University, Adelaide, South Australia 5000, Australia.,Centre for Nutrition and Gastrointestinal Diseases, Discipline of Medicine, University of Adelaide, South Australian Health and Medical Research Institute (SAHMRI), North Terrace, Adelaide, South Australia 5000, Australia
| | - Andelain Erickson
- Visceral Pain Group, South Australian Health and Medical Research Institute (SAHMRI), School of Medicine, Flinders University, Adelaide, South Australia 5000, Australia.,Centre for Nutrition and Gastrointestinal Diseases, Discipline of Medicine, University of Adelaide, South Australian Health and Medical Research Institute (SAHMRI), North Terrace, Adelaide, South Australia 5000, Australia
| | - Luke Grundy
- Visceral Pain Group, South Australian Health and Medical Research Institute (SAHMRI), School of Medicine, Flinders University, Adelaide, South Australia 5000, Australia.,Centre for Nutrition and Gastrointestinal Diseases, Discipline of Medicine, University of Adelaide, South Australian Health and Medical Research Institute (SAHMRI), North Terrace, Adelaide, South Australia 5000, Australia
| | - Grigori Y Rychkov
- Centre for Nutrition and Gastrointestinal Diseases, Discipline of Medicine, University of Adelaide, South Australian Health and Medical Research Institute (SAHMRI), North Terrace, Adelaide, South Australia 5000, Australia
| | - Katharina Zimmermann
- Klinik für Anästhesiologie am Universitätsklinikum Erlangen, Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Richard J Lewis
- Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, 306 Carmody Rd, St Lucia, Queensland 4072, Australia
| | - Stuart M Brierley
- Visceral Pain Group, South Australian Health and Medical Research Institute (SAHMRI), School of Medicine, Flinders University, Adelaide, South Australia 5000, Australia.,Centre for Nutrition and Gastrointestinal Diseases, Discipline of Medicine, University of Adelaide, South Australian Health and Medical Research Institute (SAHMRI), North Terrace, Adelaide, South Australia 5000, Australia
| | - Irina Vetter
- Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, 306 Carmody Rd, St Lucia, Queensland 4072, Australia.,School of Pharmacy, The University of Queensland, 20 Cornwall St, Woolloongabba, Queensland 4102, Australia
| |
Collapse
|
123
|
Deuis JR, Dekan Z, Wingerd JS, Smith JJ, Munasinghe NR, Bhola RF, Imlach WL, Herzig V, Armstrong DA, Rosengren KJ, Bosmans F, Waxman SG, Dib-Hajj SD, Escoubas P, Minett MS, Christie MJ, King GF, Alewood PF, Lewis RJ, Wood JN, Vetter I. Pharmacological characterisation of the highly Na V1.7 selective spider venom peptide Pn3a. Sci Rep 2017; 7:40883. [PMID: 28106092 PMCID: PMC5247677 DOI: 10.1038/srep40883] [Citation(s) in RCA: 102] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Accepted: 12/12/2016] [Indexed: 12/19/2022] Open
Abstract
Human genetic studies have implicated the voltage-gated sodium channel NaV1.7 as a therapeutic target for the treatment of pain. A novel peptide, μ-theraphotoxin-Pn3a, isolated from venom of the tarantula Pamphobeteus nigricolor, potently inhibits NaV1.7 (IC50 0.9 nM) with at least 40-1000-fold selectivity over all other NaV subtypes. Despite on-target activity in small-diameter dorsal root ganglia, spinal slices, and in a mouse model of pain induced by NaV1.7 activation, Pn3a alone displayed no analgesic activity in formalin-, carrageenan- or FCA-induced pain in rodents when administered systemically. A broad lack of analgesic activity was also found for the selective NaV1.7 inhibitors PF-04856264 and phlotoxin 1. However, when administered with subtherapeutic doses of opioids or the enkephalinase inhibitor thiorphan, these subtype-selective NaV1.7 inhibitors produced profound analgesia. Our results suggest that in these inflammatory models, acute administration of peripherally restricted NaV1.7 inhibitors can only produce analgesia when administered in combination with an opioid.
Collapse
Affiliation(s)
- Jennifer R. Deuis
- IMB Centre for Pain Research, Institute for Molecular Bioscience, 306 Carmody Rd (Building 80), The University of Queensland, St Lucia, Queensland, 4072, Australia
| | - Zoltan Dekan
- IMB Centre for Pain Research, Institute for Molecular Bioscience, 306 Carmody Rd (Building 80), The University of Queensland, St Lucia, Queensland, 4072, Australia
| | - Joshua S. Wingerd
- IMB Centre for Pain Research, Institute for Molecular Bioscience, 306 Carmody Rd (Building 80), The University of Queensland, St Lucia, Queensland, 4072, Australia
| | - Jennifer J. Smith
- IMB Centre for Pain Research, Institute for Molecular Bioscience, 306 Carmody Rd (Building 80), The University of Queensland, St Lucia, Queensland, 4072, Australia
| | - Nehan R. Munasinghe
- Discipline of Pharmacology, School of Medical Sciences, The University of Sydney, Sydney, New South Wales, 2006, Australia
| | - Rebecca F. Bhola
- Discipline of Pharmacology, School of Medical Sciences, The University of Sydney, Sydney, New South Wales, 2006, Australia
| | - Wendy L. Imlach
- Discipline of Pharmacology, School of Medical Sciences, The University of Sydney, Sydney, New South Wales, 2006, Australia
| | - Volker Herzig
- IMB Centre for Pain Research, Institute for Molecular Bioscience, 306 Carmody Rd (Building 80), The University of Queensland, St Lucia, Queensland, 4072, Australia
| | - David A. Armstrong
- School of Biomedical Sciences, The University of Queensland, St Lucia, Queensland, 4072, Australia
| | - K. Johan Rosengren
- School of Biomedical Sciences, The University of Queensland, St Lucia, Queensland, 4072, Australia
| | - Frank Bosmans
- Department of Physiology & Solomon H. Snyder Department of Neuroscience, Johns Hopkins University, School of Medicine, Baltimore, MD 21205, USA
| | - Stephen G. Waxman
- Department of Neurology and Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, Connecticut 06510, Rehabilitation Research Center, Veterans Administration Connecticut Healthcare System, West Haven, Connecticut 06516, USA
| | - Sulayman D. Dib-Hajj
- Department of Neurology and Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, Connecticut 06510, Rehabilitation Research Center, Veterans Administration Connecticut Healthcare System, West Haven, Connecticut 06516, USA
| | | | - Michael S. Minett
- Molecular Nociception Group, Wolfson Institute for Biomedical Research, University College London, London WC1E 6BT, UK
| | - Macdonald J. Christie
- Discipline of Pharmacology, School of Medical Sciences, The University of Sydney, Sydney, New South Wales, 2006, Australia
| | - Glenn F. King
- IMB Centre for Pain Research, Institute for Molecular Bioscience, 306 Carmody Rd (Building 80), The University of Queensland, St Lucia, Queensland, 4072, Australia
| | - Paul F. Alewood
- IMB Centre for Pain Research, Institute for Molecular Bioscience, 306 Carmody Rd (Building 80), The University of Queensland, St Lucia, Queensland, 4072, Australia
| | - Richard J. Lewis
- IMB Centre for Pain Research, Institute for Molecular Bioscience, 306 Carmody Rd (Building 80), The University of Queensland, St Lucia, Queensland, 4072, Australia
| | - John N. Wood
- Molecular Nociception Group, Wolfson Institute for Biomedical Research, University College London, London WC1E 6BT, UK
| | - Irina Vetter
- IMB Centre for Pain Research, Institute for Molecular Bioscience, 306 Carmody Rd (Building 80), The University of Queensland, St Lucia, Queensland, 4072, Australia
- School of Pharmacy, The University of Queensland, Pharmacy Australia Centre of Excellence, 20 Cornwall St, Woolloongabba, Queensland, 4102, Australia
| |
Collapse
|
124
|
Anderson E, Schneider E, Bagriantsev S. Piezo2 in Cutaneous and Proprioceptive Mechanotransduction in Vertebrates. CURRENT TOPICS IN MEMBRANES 2017; 79:197-217. [PMID: 28728817 PMCID: PMC5630267 DOI: 10.1016/bs.ctm.2016.11.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Mechanosensitivity is a fundamental physiological capacity, which pertains to all life forms. Progress has been made with regard to understanding mechanosensitivity in bacteria, flies, and worms. In vertebrates, however, the molecular identity of mechanotransducers in somatic and neuronal cells has only started to appear. The Piezo family of mechanogated ion channels marks a pivotal milestone in understanding mechanosensitivity. Piezo1 and Piezo2 have now been shown to participate in a number of processes, ranging from arterial modeling to sensing muscle stretch. In this review, we focus on Piezo2 and its role in mediating mechanosensation and proprioception in vertebrates.
Collapse
|
125
|
Li CL, Liu XF, Li GX, Ban MQ, Chen JZ, Cui Y, Zhang JH, Wu CF. Antinociceptive Effects of AGAP, a Recombinant Neurotoxic Polypeptide: Possible Involvement of the Tetrodotoxin-Resistant Sodium Channels in Small Dorsal Root Ganglia Neurons. Front Pharmacol 2016; 7:496. [PMID: 28066245 PMCID: PMC5168466 DOI: 10.3389/fphar.2016.00496] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Accepted: 12/02/2016] [Indexed: 11/22/2022] Open
Abstract
Antitumor-analgesic peptide (AGAP) is a novel recombinant polypeptide. The primary study showed that AGAP 1.0 mg/kg exhibited strong analgesic and antitumor effects. The tail vein administration of AGAP potently reduced pain behaviors in mice induced by intraplantar injection of formalin or intraperitoneal injection of acetic acid, without affecting basal pain perception. To further assess the mechanisms of AGAP, the effects of AGAP on sodium channels were assessed using the whole-cell patch clamp recordings in dorsal root ganglia (DRG) neurons. The results showed that AGAP (3–1000 nM) inhibited the sodium currents in small-diameter DRG neurons in a dose-dependent manner. 1000 nM AGAP could inhibit the current density-voltage relationship curve of sodium channels in a voltage-dependent manner and negatively shift the activation curves. 1000 nM AGAP could reduce the tetrodotoxin-resistant (TTX-R) sodium currents by 42.8% in small-diameter DRG neurons. Further analysis revealed that AGAP potently inhibited NaV1.8 currents by 59.4%, and negatively shifted the activation and inactivation kinetics. 1000 nM AGAP also reduced the NaV1.9 currents by 33.7%, but had no significant effect on activation and inactivation kinetics. Thus, our results demonstrated that submicromolar concentrations of AGAP inhibited TTX-R sodium channel in rat small-diameter DRG neurons. It is concluded that these new results may better explain, at least in part, the analgesic properties of this polypeptide.
Collapse
Affiliation(s)
- Chun-Li Li
- Department of Pharmacology, Shenyang Pharmaceutical University Shenyang, China
| | - Xi-Fang Liu
- Department of Pharmacology, Shenyang Pharmaceutical University Shenyang, China
| | - Gui-Xia Li
- Department of Pharmacology, Shenyang Pharmaceutical University Shenyang, China
| | - Meng-Qi Ban
- Department of Pharmacology, Shenyang Pharmaceutical University Shenyang, China
| | - Jian-Zhao Chen
- Department of Pharmacology, Shenyang Pharmaceutical University Shenyang, China
| | - Yong Cui
- Department of Biochemistry, Shenyang Pharmaceutical University Shenyang, China
| | - Jing-Hai Zhang
- Department of Biochemistry, Shenyang Pharmaceutical University Shenyang, China
| | - Chun-Fu Wu
- Department of Pharmacology, Shenyang Pharmaceutical University Shenyang, China
| |
Collapse
|
126
|
Voltage-gated sodium channels and pain-related disorders. Clin Sci (Lond) 2016; 130:2257-2265. [DOI: 10.1042/cs20160041] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 09/15/2016] [Indexed: 11/17/2022]
Abstract
Voltage-gated sodium channels (VGSCs) are heteromeric transmembrane protein complexes. Nine homologous members, SCN1A–11A, make up the VGSC gene family. Sodium channel isoforms display a wide range of kinetic properties endowing different neuronal types with distinctly varied firing properties. Among the VGSCs isoforms, Nav1.7, Nav1.8 and Nav1.9 are preferentially expressed in the peripheral nervous system. These isoforms are known to be crucial in the conduction of nociceptive stimuli with mutations in these channels thought to be the underlying cause of a variety of heritable pain disorders. This review provides an overview of the current literature concerning the role of VGSCs in the generation of pain and heritable pain disorders.
Collapse
|
127
|
Fang Z, Jiang Y, Wang Y, Lin Y, Liu Y, Zhao L, Xu Y, Toorabally MB, He S, Zhang F. The rs6771157 C/G polymorphism in SCN10A is associated with the risk of atrial fibrillation in a Chinese Han population. Sci Rep 2016; 6:35212. [PMID: 27725708 PMCID: PMC5057108 DOI: 10.1038/srep35212] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Accepted: 09/26/2016] [Indexed: 12/19/2022] Open
Abstract
A recent genome wide associated study in European descent population identified the association of Atrial fibrillation (AF) risk with a single nucleotide polymorphism (SNP) in SCN10A. The aim of this study was to evaluate whether SCN10A polymorphisms are associated with AF risk in the Chinese Han population. A total of 2,300 individuals of Chinese Han origin were recruited and three potentially functional SNPs were genotyped. Logistic regression models were utilized to calculate odds ratios (ORs) at a 95% confidence intervals (CIs). Logistic regression analysis in an additive genetic model revealed that one SNP in SCN10A (rs6771157) was associated with an increased risk of AF (adjusted OR = 1.20, 95% CI: 1.06 - 1.36, P = 0.003). Stratification analysis of several main AF risk factors indicated that the risk associations with rs6771157 were not statistically different among different subgroups. In summary, our study suggests the possible involvement of the SCN10A variant in AF development in Chinese Han populations. Further biological function analyses are required to confirm our finding.
Collapse
Affiliation(s)
- Zhen Fang
- Department of Cardiology, Clinical Medical College, Yangzhou University, Yangzhou, Jiangsu, China.,Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
| | - Yue Jiang
- Department of Epidemiology and Biostatistics, School of Public Health, Nanjing Medical University, Nanjing, Jiangsu, China
| | - Yifeng Wang
- Department of Epidemiology and Biostatistics, School of Public Health, Nanjing Medical University, Nanjing, Jiangsu, China
| | - Yuan Lin
- Department of Epidemiology and Biostatistics, School of Public Health, Nanjing Medical University, Nanjing, Jiangsu, China
| | - Yaowu Liu
- Department of Cardiology, Zhongda Hospital of Southeast University, Nanjing, Jiangsu, China
| | - Liyan Zhao
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
| | - Yan Xu
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
| | - Mohammad Bilaal Toorabally
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
| | - Shenghu He
- Department of Cardiology, Clinical Medical College, Yangzhou University, Yangzhou, Jiangsu, China
| | - Fengxiang Zhang
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, China
| |
Collapse
|
128
|
Schlüter F, Leffler A. Oxidation differentially modulates the recombinant voltage-gated Na + channel α-subunits Nav1.7 and Nav1.8. Brain Res 2016; 1648:127-135. [DOI: 10.1016/j.brainres.2016.07.031] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2016] [Revised: 06/27/2016] [Accepted: 07/19/2016] [Indexed: 11/15/2022]
|
129
|
Reduced excitability and impaired nociception in peripheral unmyelinated fibers from Nav1.9-null mice. Pain 2016; 158:58-67. [DOI: 10.1097/j.pain.0000000000000723] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
130
|
Pan HL, Liu BL, Lin W, Zhang YQ. Modulation of Nav1.8 by Lysophosphatidic Acid in the Induction of Bone Cancer Pain. Neurosci Bull 2016; 32:445-54. [PMID: 27631681 DOI: 10.1007/s12264-016-0060-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2016] [Accepted: 06/06/2016] [Indexed: 11/26/2022] Open
Abstract
Given that lysophosphatidic acid (LPA) and the tetrodotoxin-resistant sodium channel Nav1.8 are both involved in bone cancer pain, the present study was designed to investigate whether crosstalk between the LPA receptor LPA1 (also known as EDG2) and Nav1.8 in the dorsal root ganglion (DRG) contributes to the induction of bone cancer pain. We showed that the EDG2 antagonist Ki16198 blocked the mechanical allodynia induced by intrathecal LPA in naïve rats and attenuated mechanical allodynia in a rat model of bone cancer. EDG2 and Nav1.8 expression in L4-6 DRGs was upregulated following intrathecal or hindpaw injection of LPA. EDG2 and Nav1.8 expression in ipsilateral L4-6 DRGs increased with the development of bone cancer. Furthermore, we showed that EDG2 co-localized with Nav1.8 and LPA remarkably enhanced Nav1.8 currents in DRG neurons, and this was blocked by either a protein kinase C (PKC) inhibitor or a PKCε inhibitor. Overall, we demonstrated the modulation of Nav1.8 by LPA in DRG neurons, and that this probably underlies the peripheral mechanism by which bone cancer pain is induced.
Collapse
Affiliation(s)
- Hai-Li Pan
- Center for Neuropsychiatric Diseases, Institute of Life Science, Nanchang University, Nanchang, 330031, China.
| | - Ben-Long Liu
- Institute of Neurobiology, Institutes of Brain Science and State Key Laboratory of Medical Neurobiology, Collaborative Innovation Center for Brain Science, Fudan University, Shanghai, 200032, China
| | - Wei Lin
- Institute of Neurobiology, Institutes of Brain Science and State Key Laboratory of Medical Neurobiology, Collaborative Innovation Center for Brain Science, Fudan University, Shanghai, 200032, China
| | - Yu-Qiu Zhang
- Institute of Neurobiology, Institutes of Brain Science and State Key Laboratory of Medical Neurobiology, Collaborative Innovation Center for Brain Science, Fudan University, Shanghai, 200032, China
| |
Collapse
|
131
|
Yang L, Li Q, Liu X, Liu S. Roles of Voltage-Gated Tetrodotoxin-Sensitive Sodium Channels NaV1.3 and NaV1.7 in Diabetes and Painful Diabetic Neuropathy. Int J Mol Sci 2016; 17:ijms17091479. [PMID: 27608006 PMCID: PMC5037757 DOI: 10.3390/ijms17091479] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 08/24/2016] [Accepted: 08/25/2016] [Indexed: 02/07/2023] Open
Abstract
Diabetes mellitus (DM) is a common chronic medical problem worldwide; one of its complications is painful peripheral neuropathy, which can substantially erode quality of life and increase the cost of management. Despite its clinical importance, the pathogenesis of painful diabetic neuropathy (PDN) is complex and incompletely understood. Voltage-gated sodium channels (VGSCs) link many physiological processes to electrical activity by controlling action potentials in all types of excitable cells. Two isoforms of VGSCs, NaV1.3 and NaV1.7, which are encoded by the sodium voltage-gated channel alpha subunit 3 and 9 (Scn3A and Scn9A) genes, respectively, have been identified in both peripheral nociceptive neurons of dorsal root ganglion (DRG) and pancreatic islet cells. Recent advances in our understanding of tetrodotoxin-sensitive (TTX-S) sodium channels NaV1.3 and NaV1.7 lead to the rational doubt about the cause–effect relation between diabetes and painful neuropathy. In this review, we summarize the roles of NaV1.3 and NaV1.7 in islet cells and DRG neurons, discuss the link between DM and painful neuropathy, and present a model, which may provide a starting point for further studies aimed at identifying the mechanisms underlying diabetes and painful neuropathy.
Collapse
Affiliation(s)
- Linlin Yang
- Department of Endocrinology, The General Hospital of the PLA Rocket Force, Beijing 100088, China.
| | - Quanmin Li
- Department of Endocrinology, The General Hospital of the PLA Rocket Force, Beijing 100088, China.
| | - Xinming Liu
- Department of Endocrinology, The General Hospital of the PLA Rocket Force, Beijing 100088, China.
| | - Shiguang Liu
- Department of Endocrinology, The General Hospital of the PLA Rocket Force, Beijing 100088, China.
| |
Collapse
|
132
|
Duan G, Han C, Wang Q, Guo S, Zhang Y, Ying Y, Huang P, Zhang L, Macala L, Shah P, Zhang M, Li N, Dib-Hajj SD, Waxman SG, Zhang X. A SCN10A SNP biases human pain sensitivity. Mol Pain 2016; 12:12/0/1744806916666083. [PMID: 27590072 PMCID: PMC5011395 DOI: 10.1177/1744806916666083] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 07/19/2016] [Indexed: 12/19/2022] Open
Abstract
Background: Nav1.8 sodium channels, encoded by SCN10A, are preferentially expressed in nociceptive neurons and play an important role in human pain. Although rare gain-of-function variants in SCN10A have been identified in individuals with painful peripheral neuropathies, whether more common variants in SCN10A can have an effect at the channel level and at the dorsal root ganglion, neuronal level leading to a pain disorder or an altered normal pain threshold has not been determined. Results: Candidate single nucleotide polymorphism association approach together with experimental pain testing in human subjects was used to explore possible common SCN10A missense variants that might affect human pain sensitivity. We demonstrated an association between rs6795970 (G > A; p.Ala1073Val) and higher thresholds for mechanical pain in a discovery cohort (496 subjects) and confirmed it in a larger replication cohort (1005 female subjects). Functional assessments showed that although the minor allele shifts channel activation by −4.3 mV, a proexcitatory attribute, it accelerates inactivation, an antiexcitatory attribute, with the net effect being reduced repetitive firing of dorsal root ganglion neurons, consistent with lower mechanical pain sensitivity. Conclusions: At the association and mechanistic levels, the SCN10A single nucleotide polymorphism rs6795970 biases human pain sensitivity.
Collapse
Affiliation(s)
- Guangyou Duan
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China Department of Anesthesiology, Xinqiao Hospital, Third Military Medical University, Chongqing, P.R. China
| | - Chongyang Han
- Department of Neurology and Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, CT, USA Rehabilitation Research Center, Veterans' Affairs Connecticut Healthcare System, West Haven, CT, USA
| | - Qingli Wang
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China Department of Anesthesiology, Wuhan General Hospital of Guangzhou Military, Wuhan, P.R. China
| | - Shanna Guo
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Yuhao Zhang
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Ying Ying
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Penghao Huang
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Li Zhang
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Lawrence Macala
- Department of Neurology and Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, CT, USA Rehabilitation Research Center, Veterans' Affairs Connecticut Healthcare System, West Haven, CT, USA
| | - Palak Shah
- Department of Neurology and Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, CT, USA Rehabilitation Research Center, Veterans' Affairs Connecticut Healthcare System, West Haven, CT, USA
| | - Mi Zhang
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Ningbo Li
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Sulayman D Dib-Hajj
- Department of Neurology and Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, CT, USA Rehabilitation Research Center, Veterans' Affairs Connecticut Healthcare System, West Haven, CT, USA
| | - Stephen G Waxman
- Department of Neurology and Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, CT, USA Rehabilitation Research Center, Veterans' Affairs Connecticut Healthcare System, West Haven, CT, USA
| | - Xianwei Zhang
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| |
Collapse
|
133
|
Ramachandra R, Elmslie KS. EXPRESS: Voltage-dependent sodium (NaV) channels in group IV sensory afferents. Mol Pain 2016; 12:12/0/1744806916660721. [PMID: 27385723 PMCID: PMC4956173 DOI: 10.1177/1744806916660721] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Patients with intermittent claudication suffer from both muscle pain and an exacerbated exercise pressor reflex. Excitability of the group III and group IV afferent fibers mediating these functions is controlled in part by voltage-dependent sodium (NaV) channels. We previously found tetrodotoxin-resistant NaV1.8 channels to be the primary type in muscle afferent somata. However, action potentials in group III and IV afferent axons are blocked by TTX, supporting a minimal role of NaV1.8 channels. To address these apparent differences in NaV channel expression between axon and soma, we used immunohistochemistry to identify the NaV channels expressed in group IV axons within the gastrocnemius muscle and the dorsal root ganglia sections. Positive labeling by an antibody against the neurofilament protein peripherin was used to identify group IV neurons and axons. We show that >67% of group IV fibers express NaV1.8, NaV1.6, or NaV1.7. Interestingly, expression of NaV1.8 channels in group IV somata was significantly higher than in the fibers, whereas there were no significant differences for either NaV1.6 or NaV1.7. When combined with previous work, our results suggest that NaV1.8 channels are expressed in most group IV axons, but that, under normal conditions, NaV1.6 and/or NaV1.7 play a more important role in action potential generation to signal muscle pain and the exercise pressor reflex.
Collapse
Affiliation(s)
- Renuka Ramachandra
- The Baker Laboratory of Pharmacology, Department of Pharmacology, AT Still University of Health Sciences, Kirksville, MO, USA
- Renuka Ramachandra, The Baker Laboratory of Pharmacology, Department of Pharmacology, Kirksville College of Osteopathic Medicine, AT Still University of Health Sciences, Kirksville, MO 63501, USA.
| | - Keith S Elmslie
- The Baker Laboratory of Pharmacology, Department of Pharmacology, AT Still University of Health Sciences, Kirksville, MO, USA
| |
Collapse
|
134
|
Juif PE, Salio C, Zell V, Melchior M, Lacaud A, Petit-Demouliere N, Ferrini F, Darbon P, Hanesch U, Anton F, Merighi A, Lelièvre V, Poisbeau P. Peripheral and central alterations affecting spinal nociceptive processing and pain at adulthood in rats exposed to neonatal maternal deprivation. Eur J Neurosci 2016; 44:1952-62. [DOI: 10.1111/ejn.13294] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Revised: 05/24/2016] [Accepted: 06/07/2016] [Indexed: 12/13/2022]
Affiliation(s)
- Pierre-Eric Juif
- Institute of Cellular and Integrative Neurosciences (INCI); Centre National de la Recherche Scientifique; University of Strasbourg; 5 Rue Blaise Pascal F-67084 Strasbourg France
| | - Chiara Salio
- Department of Veterinary Sciences; Università degli Studi di Torino; Torino Italy
| | - Vivien Zell
- Institute of Cellular and Integrative Neurosciences (INCI); Centre National de la Recherche Scientifique; University of Strasbourg; 5 Rue Blaise Pascal F-67084 Strasbourg France
| | - Meggane Melchior
- Institute of Cellular and Integrative Neurosciences (INCI); Centre National de la Recherche Scientifique; University of Strasbourg; 5 Rue Blaise Pascal F-67084 Strasbourg France
| | - Adrien Lacaud
- Institute of Cellular and Integrative Neurosciences (INCI); Centre National de la Recherche Scientifique; University of Strasbourg; 5 Rue Blaise Pascal F-67084 Strasbourg France
| | - Nathalie Petit-Demouliere
- Institute of Cellular and Integrative Neurosciences (INCI); Centre National de la Recherche Scientifique; University of Strasbourg; 5 Rue Blaise Pascal F-67084 Strasbourg France
| | - Francesco Ferrini
- Department of Veterinary Sciences; Università degli Studi di Torino; Torino Italy
| | - Pascal Darbon
- Institute of Cellular and Integrative Neurosciences (INCI); Centre National de la Recherche Scientifique; University of Strasbourg; 5 Rue Blaise Pascal F-67084 Strasbourg France
| | - Ulrike Hanesch
- Laboratory of Neurophysiology and Psychobiology; University of Luxembourg; Luxembourg Luxembourg
| | - Fernand Anton
- Laboratory of Neurophysiology and Psychobiology; University of Luxembourg; Luxembourg Luxembourg
| | - Adalberto Merighi
- Department of Veterinary Sciences; Università degli Studi di Torino; Torino Italy
| | - Vincent Lelièvre
- Institute of Cellular and Integrative Neurosciences (INCI); Centre National de la Recherche Scientifique; University of Strasbourg; 5 Rue Blaise Pascal F-67084 Strasbourg France
| | - Pierrick Poisbeau
- Institute of Cellular and Integrative Neurosciences (INCI); Centre National de la Recherche Scientifique; University of Strasbourg; 5 Rue Blaise Pascal F-67084 Strasbourg France
| |
Collapse
|
135
|
O'Bryant Z, Leng T, Liu M, Inoue K, Vann KT, Xiong ZG. Acid Sensing Ion Channels (ASICs) in NS20Y cells - potential role in neuronal differentiation. Mol Brain 2016; 9:68. [PMID: 27342076 PMCID: PMC4920985 DOI: 10.1186/s13041-016-0249-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Accepted: 06/15/2016] [Indexed: 11/10/2022] Open
Abstract
Cultured neuronal cell lines can express properties of mature neurons if properly differentiated. Although the precise mechanisms underlying neuronal differentiation are not fully understood, the expression and activation of ion channels, particularly those of Ca2+-permeable channels, have been suggested to play a role. In this study, we explored the presence and characterized the properties of acid-sensing ion channels (ASICs) in NS20Y cells, a neuronal cell line previously used for the study of neuronal differentiation. In addition, the potential role of ASICs in cell differentiation was explored. Reverse Transcription Polymerase Chain Reaction and Western blot revealed the presence of ASIC1 subunits in these cells. Fast drops of extracellular pH activated transient inward currents which were blocked, in a dose dependent manner, by amiloride, a non-selective ASIC blocker, and by Psalmotoxin-1 (PcTX1), a specific inhibitor for homomeric ASIC1a and heteromeric ASIC1a/2b channels. Incubation of cells with PcTX1 significantly reduced the differentiation of NS20Y cells induced by cpt-cAMP, as evidenced by decreased neurite length, dendritic complexity, decreased expression of functional voltage gated Na+ channels. Consistent with ASIC1a inhibition, ASIC1a knockdown with small interference RNA significantly attenuates cpt-cAMP-induced increase of neurite outgrowth. In summary, we described the presence of functional ASICs in NS20Y cells and demonstrate that ASIC1a plays a role in the differentiation of these cells.
Collapse
Affiliation(s)
- Zaven O'Bryant
- Neuroscience Institute, Morehouse School of Medicine, 720 Westview Drive SW, Atlanta, GA, 30310-1945, USA
| | - Tiandong Leng
- Neuroscience Institute, Morehouse School of Medicine, 720 Westview Drive SW, Atlanta, GA, 30310-1945, USA
| | - Mingli Liu
- Neuroscience Institute, Morehouse School of Medicine, 720 Westview Drive SW, Atlanta, GA, 30310-1945, USA
| | - Koichi Inoue
- Neuroscience Institute, Morehouse School of Medicine, 720 Westview Drive SW, Atlanta, GA, 30310-1945, USA
| | - Kiara T Vann
- Neuroscience Institute, Morehouse School of Medicine, 720 Westview Drive SW, Atlanta, GA, 30310-1945, USA
| | - Zhi-Gang Xiong
- Neuroscience Institute, Morehouse School of Medicine, 720 Westview Drive SW, Atlanta, GA, 30310-1945, USA.
| |
Collapse
|
136
|
Hoffmann T, Kistner K, Nassar M, Reeh PW, Weidner C. Use dependence of peripheral nociceptive conduction in the absence of tetrodotoxin-resistant sodium channel subtypes. J Physiol 2016; 594:5529-41. [PMID: 27105013 DOI: 10.1113/jp272082] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Accepted: 04/11/2016] [Indexed: 11/08/2022] Open
Abstract
KEY POINTS This study examines conduction in peripheral nerves and its use dependence in tetrodotoxin-resistant (TTXr) sodium channel (Nav 1.8, Nav 1.9) knockout and wildtype animals. We observed use-dependent decreases of single fibre and compound action potential amplitude in peripheral mouse C-fibres (wildtype). This matches the previously published hypothesis that increased Na/K-pump activity is not the underlying mechanism for use-dependent changes of neural conduction. Knocking out TTXr sodium channels influences use-dependent changes of conductive properties (action potential amplitude, latency, conduction safety) in the order Nav 1.8 KO > Nav 1.9KO > wildtype. This is most likely explained by different subsets of presumably (relatively) Nav 1.7-rich conducting fibres in knockout animals as compared to wildtypes, in combination with reduced per-pulse sodium influx. ABSTRACT Use dependency of peripheral nerves, especially of nociceptors, correlates with receptive properties. Slow inactivation of voltage-gated sodium channels has been discussed to be the underlying mechanism - pointing to a receptive class-related difference of sodium channel equipment. Using electrophysiological recordings of single unmyelinated cutaneous fibres and their compound action potential (AP), we evaluated use-dependent changes in mouse peripheral nerves, and the contribution of the tetrodotoxin-resistant (TTXr) sodium channels Nav 1.8 and Nav 1.9 to these changes. Nerve fibres were electrically stimulated using single or double pulses at 2 Hz. Use-dependent changes of latency, AP amplitude, and duration as well as the fibres' ability to follow the stimulus were evaluated. AP amplitudes substantially diminished in used fibres from C57BL/6 but increased in Nav 1.8 knockout (KO) mice, with Nav 1.9 KO in between. Activity-induced latency slowing was in contrast the most pronounced in Nav 1.8 KOs and the least in wildtype mice. The genotype was also predictive of how long fibres could follow the double pulsed stimulus with wildtype fibres blocking first and Nav 1.8 KO fibres enduring the longest. In contrast, changes in spike duration were less pronounced and displayed no significant tendency. Thus, all major measures of peripheral nerve accommodation (amplitude, latency and durability) depended on genotype. All use-dependent changes appeared in the order NaV 1.8 KO > NaV 1.9 KO > wildtype, which is most likely explained by the relative contribution of Nav 1.7 varying in the same order and the amounts of per-pulse sodium influx expected in the opposite order.
Collapse
Affiliation(s)
- Tal Hoffmann
- Institute for Physiology and Pathophysiology, University of Erlangen-Nuremberg, Erlangen, Germany.
| | - Katrin Kistner
- Institute for Physiology and Pathophysiology, University of Erlangen-Nuremberg, Erlangen, Germany
| | | | - Peter W Reeh
- Institute for Physiology and Pathophysiology, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Christian Weidner
- Institute for Physiology and Pathophysiology, University of Erlangen-Nuremberg, Erlangen, Germany
| |
Collapse
|
137
|
Lee CK, Park KH, Baik SK, Jeong SW. Decreased excitability and voltage-gated sodium currents in aortic baroreceptor neurons contribute to the impairment of arterial baroreflex in cirrhotic rats. Am J Physiol Regul Integr Comp Physiol 2016; 310:R1088-101. [DOI: 10.1152/ajpregu.00129.2015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Accepted: 03/10/2016] [Indexed: 02/07/2023]
Abstract
Cardiovascular autonomic dysfunction, which is manifested by an impairment of the arterial baroreflex, is prevalent irrespective of etiology and contributes to the increased morbidity and mortality in cirrhotic patients. However, the cellular mechanisms that underlie the cirrhosis-impaired arterial baroreflex remain unknown. In the present study, we examined whether the cirrhosis-impaired arterial baroreflex is attributable to the dysfunction of aortic baroreceptor (AB) neurons. Biliary and nonbiliary cirrhotic rats were generated via common bile duct ligation (CBDL) and intraperitoneal injections of thioacetamide (TAA), respectively. Histological and molecular biological examinations confirmed the development of fibrosis in the livers of both cirrhotic rat models. The heart rate changes during phenylephrine-induced baroreceptor activation indicated that baroreflex sensitivity was blunted in the CBDL and TAA rats. Under the current-clamp mode of the patch-clamp technique, cell excitability was recorded in DiI-labeled AB neurons. The number of action potential discharges in the A- and C-type AB neurons was significantly decreased because of the increased rheobase and threshold potential in the CBDL and TAA rats compared with sham-operated rats. Real-time PCR and Western blotting indicated that the NaV1.7, NaV1.8, and NaV1.9 transcripts and proteins were significantly downregulated in the nodose ganglion neurons from the CBDL and TAA rats compared with the sham-operated rats. Consistent with these molecular data, the tetrodotoxin-sensitive NaV currents and the tetrodotoxin-resistant NaV currents were significantly decreased in A- and C-type AB neurons, respectively, from the CBDL and TAA rats compared with the sham-operated rats. Taken together, these findings implicate a key cellular mechanism in the cirrhosis-impaired arterial baroreflex.
Collapse
Affiliation(s)
- Choong-Ku Lee
- Department of Physiology, Brain Research Group, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
| | - Kwang-Hwa Park
- Department of Pathology, Brain Research Group, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
| | - Soon-Koo Baik
- Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
| | - Seong-Woo Jeong
- Department of Physiology, Brain Research Group, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea
| |
Collapse
|
138
|
Gourraud JB, Barc J, Thollet A, Le Scouarnec S, Le Marec H, Schott JJ, Redon R, Probst V. The Brugada Syndrome: A Rare Arrhythmia Disorder with Complex Inheritance. Front Cardiovasc Med 2016; 3:9. [PMID: 27200363 PMCID: PMC4842929 DOI: 10.3389/fcvm.2016.00009] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Accepted: 03/28/2016] [Indexed: 12/19/2022] Open
Abstract
For the last 10 years, applying new sequencing technologies to thousands of whole exomes has revealed the high variability of the human genome. Extreme caution should thus be taken to avoid misinterpretation when associating rare genetic variants to disease susceptibility. The Brugada syndrome (BrS) is a rare inherited arrhythmia disease associated with high risk of sudden cardiac death in the young adult. Familial inheritance has long been described as Mendelian, with autosomal dominant mode of transmission and incomplete penetrance. However, all except 1 of the 23 genes previously associated with the disease have been identified through a candidate gene approach. To date, only rare coding variants in the SCN5A gene have been significantly associated with the syndrome. However, the genotype/phenotype studies conducted in families with SCN5A mutations illustrate the complex mode of inheritance of BrS. This genetic complexity has recently been confirmed by the identification of common polymorphic alleles strongly associated with disease risk. The implication of both rare and common variants in BrS susceptibility implies that one should first define a proper genetic model for BrS predisposition prior to applying molecular diagnosis. Although long remains the way to personalized medicine against BrS, the high phenotype variability encountered in familial forms of the disease may partly find an explanation into this specific genetic architecture.
Collapse
Affiliation(s)
- Jean-Baptiste Gourraud
- Service de Cardiologie, Centre Hospitalier Universitaire (CHU) de Nantes, l'institut du thorax, Nantes, France; Institut National de la Santé et de la Recherche Médicale (INSERM) Unité Mixte de Recherche (UMR) 1087, l'institut du thorax, Nantes, France; Centre National de la Recherche Scientifique (CNRS) UMR 6291, l'institut du thorax, Nantes, France; l'institut du thorax, Université de Nantes, Nantes, France
| | - Julien Barc
- Institut National de la Santé et de la Recherche Médicale (INSERM) Unité Mixte de Recherche (UMR) 1087, l'institut du thorax, Nantes, France; Centre National de la Recherche Scientifique (CNRS) UMR 6291, l'institut du thorax, Nantes, France; l'institut du thorax, Université de Nantes, Nantes, France
| | - Aurélie Thollet
- Service de Cardiologie, Centre Hospitalier Universitaire (CHU) de Nantes, l'institut du thorax , Nantes , France
| | - Solena Le Scouarnec
- Institut National de la Santé et de la Recherche Médicale (INSERM) Unité Mixte de Recherche (UMR) 1087, l'institut du thorax, Nantes, France; Centre National de la Recherche Scientifique (CNRS) UMR 6291, l'institut du thorax, Nantes, France; l'institut du thorax, Université de Nantes, Nantes, France
| | - Hervé Le Marec
- Service de Cardiologie, Centre Hospitalier Universitaire (CHU) de Nantes, l'institut du thorax, Nantes, France; Institut National de la Santé et de la Recherche Médicale (INSERM) Unité Mixte de Recherche (UMR) 1087, l'institut du thorax, Nantes, France; Centre National de la Recherche Scientifique (CNRS) UMR 6291, l'institut du thorax, Nantes, France; l'institut du thorax, Université de Nantes, Nantes, France
| | - Jean-Jacques Schott
- Service de Cardiologie, Centre Hospitalier Universitaire (CHU) de Nantes, l'institut du thorax, Nantes, France; Institut National de la Santé et de la Recherche Médicale (INSERM) Unité Mixte de Recherche (UMR) 1087, l'institut du thorax, Nantes, France; Centre National de la Recherche Scientifique (CNRS) UMR 6291, l'institut du thorax, Nantes, France; l'institut du thorax, Université de Nantes, Nantes, France
| | - Richard Redon
- Service de Cardiologie, Centre Hospitalier Universitaire (CHU) de Nantes, l'institut du thorax, Nantes, France; Institut National de la Santé et de la Recherche Médicale (INSERM) Unité Mixte de Recherche (UMR) 1087, l'institut du thorax, Nantes, France; Centre National de la Recherche Scientifique (CNRS) UMR 6291, l'institut du thorax, Nantes, France; l'institut du thorax, Université de Nantes, Nantes, France
| | - Vincent Probst
- Service de Cardiologie, Centre Hospitalier Universitaire (CHU) de Nantes, l'institut du thorax, Nantes, France; Institut National de la Santé et de la Recherche Médicale (INSERM) Unité Mixte de Recherche (UMR) 1087, l'institut du thorax, Nantes, France; Centre National de la Recherche Scientifique (CNRS) UMR 6291, l'institut du thorax, Nantes, France; l'institut du thorax, Université de Nantes, Nantes, France
| |
Collapse
|
139
|
Qiu F, Li Y, Fu Q, Fan YY, Zhu C, Liu YH, Mi WD. Stromal Cell-Derived Factor 1 Increases Tetrodotoxin-Resistant Sodium Currents Nav1.8 and Nav1.9 in Rat Dorsal Root Ganglion Neurons via Different Mechanisms. Neurochem Res 2016; 41:1587-603. [DOI: 10.1007/s11064-016-1873-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2015] [Revised: 02/13/2016] [Accepted: 02/16/2016] [Indexed: 10/22/2022]
|
140
|
He WY, Zhang B, Xiong QM, Yang CX, Zhao WC, He J, Zhou J, Wang HB. Intrathecal administration of rapamycin inhibits the phosphorylation of DRG Nav1.8 and attenuates STZ-induced painful diabetic neuropathy in rats. Neurosci Lett 2016; 619:21-8. [DOI: 10.1016/j.neulet.2016.02.064] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Revised: 02/27/2016] [Accepted: 02/29/2016] [Indexed: 01/19/2023]
|
141
|
Dabby R, Sadeh M, Broitman Y, Yosovich K, Dickman R, Leshinsky-Silver E. Painful small fiber neuropathy with gastroparesis: A new phenotype with a novel mutation in the SCN10A gene. J Clin Neurosci 2016; 26:84-8. [DOI: 10.1016/j.jocn.2015.05.071] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Revised: 05/16/2015] [Accepted: 05/17/2015] [Indexed: 01/27/2023]
|
142
|
Deuis JR, Dekan Z, Inserra MC, Lee TH, Aguilar MI, Craik DJ, Lewis RJ, Alewood PF, Mobli M, Schroeder CI, Henriques ST, Vetter I. Development of a μO-Conotoxin Analogue with Improved Lipid Membrane Interactions and Potency for the Analgesic Sodium Channel NaV1.8. J Biol Chem 2016; 291:11829-42. [PMID: 27026701 DOI: 10.1074/jbc.m116.721662] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Indexed: 12/19/2022] Open
Abstract
The μO-conotoxins MrVIA, MrVIB, and MfVIA inhibit the voltage-gated sodium channel NaV1.8, a well described target for the treatment of pain; however, little is known about the residues or structural elements that define this activity. In this study, we determined the three-dimensional structure of MfVIA, examined its membrane binding properties, performed alanine-scanning mutagenesis, and identified residues important for its activity at human NaV1.8. A second round of mutations resulted in (E5K,E8K)MfVIA, a double mutant with greater positive surface charge and greater affinity for lipid membranes compared with MfVIA. This analogue had increased potency at NaV1.8 and was analgesic in the mouse formalin assay.
Collapse
Affiliation(s)
- Jennifer R Deuis
- From the Institute for Molecular Bioscience and School of Pharmacy, The University of Queensland, Woolloongabba, Queensland 4102, Australia, and
| | | | - Marco C Inserra
- From the Institute for Molecular Bioscience and School of Pharmacy, The University of Queensland, Woolloongabba, Queensland 4102, Australia, and
| | - Tzong-Hsien Lee
- Department of Biochemistry and Molecular Biology, Monash University, Wellington Road, Clayton, Victoria 3800, Australia
| | - Marie-Isabel Aguilar
- Department of Biochemistry and Molecular Biology, Monash University, Wellington Road, Clayton, Victoria 3800, Australia
| | | | | | | | - Mehdi Mobli
- Centre for Advanced Imaging, The University of Queensland, St. Lucia, Queensland 4072, Australia
| | | | | | - Irina Vetter
- From the Institute for Molecular Bioscience and School of Pharmacy, The University of Queensland, Woolloongabba, Queensland 4102, Australia, and
| |
Collapse
|
143
|
Nakamura M, Jang IS. Indomethacin inhibits tetrodotoxin-resistant Na(+) channels at acidic pH in rat nociceptive neurons. Neuropharmacology 2016; 105:454-462. [PMID: 26898291 DOI: 10.1016/j.neuropharm.2016.02.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2015] [Revised: 02/02/2016] [Accepted: 02/15/2016] [Indexed: 02/06/2023]
Abstract
Non-steroidal anti-inflammatory drugs (NSAIDs) are well-known inhibitors of cyclooxygenases (COXs) and are widely used for the treatment of inflammatory pain; however several NSAIDs display COX-independent analgesic action including the inhibition of voltage-gated Na(+) channels expressed in primary afferent neurons. In the present study, we examined whether NSAIDs modulate tetrodotoxin-resistant (TTX-R) Na(+) channels and if this modulation depends on the extracellular pH. The TTX-R Na(+) currents were recorded from small-sized trigeminal ganglion neurons by using a whole-cell patch clamp technique. Among eight NSAIDs tested in this study, several drugs, including aspirin and ibuprofen, did not affect TTX-R Na(+) channels either at pH 7.4 or at pH 6.0. However, we found that indomethacin, and, to a lesser extent, ibuprofen and naproxen potently inhibited the peak amplitude of TTX-R Na(+) currents at pH 6.0. The indomethacin-induced inhibition of TTX-R Na(+) channels was more potent at depolarized membrane potentials. Indomethacin significantly shifted both the voltage-activation and voltage-inactivation relationships to depolarizing potentials at pH 6.0. Indomethacin accelerated the development of inactivation and retarded the recovery from inactivation of TTX-R Na(+) channels at pH 6.0. Given that indomethacin and several other NSAIDs could further suppress local nociceptive signals by inhibiting TTX-R Na(+) channels at an acidic pH in addition to the classical COX inhibition, these drugs could be particularly useful for the treatment of inflammatory pain.
Collapse
Affiliation(s)
- Michiko Nakamura
- Department of Pharmacology, School of Dentistry, Kyungpook National University, Daegu 700-412, Republic of Korea; Brain Science & Engineering Institute, Kyungpook National University, Daegu 700-412, Republic of Korea
| | - Il-Sung Jang
- Department of Pharmacology, School of Dentistry, Kyungpook National University, Daegu 700-412, Republic of Korea; Brain Science & Engineering Institute, Kyungpook National University, Daegu 700-412, Republic of Korea.
| |
Collapse
|
144
|
Barbosa C, Cummins TR. Unusual Voltage-Gated Sodium Currents as Targets for Pain. CURRENT TOPICS IN MEMBRANES 2016; 78:599-638. [PMID: 27586296 DOI: 10.1016/bs.ctm.2015.12.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Pain is a serious health problem that impacts the lives of many individuals. Hyperexcitability of peripheral sensory neurons contributes to both acute and chronic pain syndromes. Because voltage-gated sodium currents are crucial to the transmission of electrical signals in peripheral sensory neurons, the channels that underlie these currents are attractive targets for pain therapeutics. Sodium currents and channels in peripheral sensory neurons are complex. Multiple-channel isoforms contribute to the macroscopic currents in nociceptive sensory neurons. These different isoforms exhibit substantial variations in their kinetics and pharmacology. Furthermore, sodium current complexity is enhanced by an array of interacting proteins that can substantially modify the properties of voltage-gated sodium channels. Resurgent sodium currents, atypical currents that can enhance recovery from inactivation and neuronal firing, are increasingly being recognized as playing potentially important roles in sensory neuron hyperexcitability and pain sensations. Here we discuss unusual sodium channels and currents that have been identified in nociceptive sensory neurons, describe what is known about the molecular determinants of the complex sodium currents in these neurons. Finally, we provide an overview of therapeutic strategies to target voltage-gated sodium currents in nociceptive neurons.
Collapse
Affiliation(s)
- C Barbosa
- Indiana University School of Medicine, Indianapolis, IN, United States
| | - T R Cummins
- Indiana University School of Medicine, Indianapolis, IN, United States
| |
Collapse
|
145
|
Djouhri L. Aδ-fiber low threshold mechanoreceptors innervating mammalian hairy skin: A review of their receptive, electrophysiological and cytochemical properties in relation to Aδ-fiber high threshold mechanoreceptors. Neurosci Biobehav Rev 2016; 61:225-38. [DOI: 10.1016/j.neubiorev.2015.12.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2015] [Revised: 12/10/2015] [Accepted: 12/18/2015] [Indexed: 01/06/2023]
|
146
|
Ye P, Hua L, Jiao Y, Li Z, Qin S, Fu J, Jiang F, Liu T, Ji Y. Functional up-regulation of Nav1.8 sodium channel on dorsal root ganglia neurons contributes to the induction of scorpion sting pain. Acta Biochim Biophys Sin (Shanghai) 2016; 48:132-44. [PMID: 26764239 DOI: 10.1093/abbs/gmv123] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Accepted: 08/02/2015] [Indexed: 12/19/2022] Open
Abstract
BmK I, purified from the venom of scorpion Buthus martensi Karsch (BmK), is a receptor site-3-specific modulator of voltage-gated sodium channels (VGSCs) and can induce pain-related behaviors in rats. The tetrodotoxin-resistant (TTX-R) sodium channel Nav1.8 contributes to most of the sodium current underlying the action potential upstroke in dorsal root ganglia (DRG) neurons and may serve as a critical ion channel targeted by BmK I. Herein, using electrophysiological, molecular, and behavioral approaches, we investigated whether the aberrant expression of Nav1.8 in DRG contributes to generation of pain induced by BmK I. The expression of Nav1.8 was found to be significantly increased at both mRNA and protein levels following intraplantar injection of BmK I in rats. In addition, the current density of TTX-R Nav1.8 sodium channel is significantly increased and the gating kinetics of Nav1.8 is also altered in DRG neurons from BmK I-treated rats. Furthermore, spontaneous pain and mechanical allodynia, but not thermal hyperalgesia induced by BmK I, are significantly alleviated through either blockade of the Nav1.8 sodium channel by its selective blocker A-803467 or knockdown of the Nav1.8 expression in DRG by antisense oligodeoxynucleotide (AS-ODN) targeting Nav1.8 in rats. Finally, BmK I was shown to induce enhanced pain behaviors in complete freund's adjuvant (CFA)-inflamed rats, which was partly due to the over-expression of Nav1.8 in DRG. Our results suggest that functional up-regulation of Nav1.8 channel on DRG neurons contributes to the development of BmK I-induced pain in rats.
Collapse
Affiliation(s)
- Pin Ye
- Laboratory of Neuropharmacology and Neurotoxicology, Shanghai University, Shanghai 200436, China
| | - Liming Hua
- Laboratory of Neuropharmacology and Neurotoxicology, Shanghai University, Shanghai 200436, China
| | - Yunlu Jiao
- Laboratory of Neuropharmacology and Neurotoxicology, Shanghai University, Shanghai 200436, China
| | - Zhenwei Li
- Laboratory of Neuropharmacology and Neurotoxicology, Shanghai University, Shanghai 200436, China
| | - Shichao Qin
- Laboratory of Neuropharmacology and Neurotoxicology, Shanghai University, Shanghai 200436, China
| | - Jin Fu
- Laboratory of Neuropharmacology and Neurotoxicology, Shanghai University, Shanghai 200436, China
| | - Feng Jiang
- Laboratory of Neuropharmacology and Neurotoxicology, Shanghai University, Shanghai 200436, China
| | - Tong Liu
- Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases and Institute of Neuroscience, Soochow University, Suzhou 215021, China
| | - Yonghua Ji
- Laboratory of Neuropharmacology and Neurotoxicology, Shanghai University, Shanghai 200436, China
| |
Collapse
|
147
|
Han C, Huang J, Waxman SG. Sodium channel Nav1.8: Emerging links to human disease. Neurology 2016; 86:473-83. [PMID: 26747884 DOI: 10.1212/wnl.0000000000002333] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Accepted: 10/07/2015] [Indexed: 12/19/2022] Open
Abstract
The NaV1.8 sodium channel, encoded by gene SCN10A, was initially termed sensory neuron-specific (SNS) due to prominent expression in primary sensory neurons including dorsal root ganglion (DRG) neurons. Early studies on rodent NaV1.8 demonstrated depolarized voltage dependence of channel inactivation, a slow rate of inactivation, and rapid recovery from inactivation. As a result of these biophysical properties, NaV1.8 supports repetitive firing in response to sustained depolarization. This article reviews recent studies that reveal multiple links of NaV1.8 to human disease: (1) It has recently been shown that functional attributes that distinguish NaV1.8 from other sodium channel subtypes are exaggerated in human NaV1.8; its influence on neuronal activity is thus greater than previously thought. (2) Gain-of-function mutations of NaV1.8 that produce DRG neuron hyperexcitability have been found in 3% of patients with painful neuropathy, establishing a role in pathogenesis. (3) NaV1.8 is ectopically expressed within Purkinje neurons in multiple sclerosis (MS), where it perturbs electrical activity. Recent evidence indicates that variants of SCN10A predict the degree of cerebellar dysfunction in MS. (4) Emerging evidence has linked SCN10A variants to disorders of cardiac rhythm, via mechanisms that may include an effect on cardiac innervation. Involvement of NaV1.8 in neurologic disease may have therapeutic implications. NaV1.8-specific blocking agents, under development, ameliorate pain and attenuate MS-like deficits in animal models. Recent studies suggest that pharmacogenomics may permit the matching of specific channel blocking agents to particular patients. The new links of NaV1.8 in human disease raise new questions, but also suggest new therapeutic strategies.
Collapse
Affiliation(s)
- Chongyang Han
- From the Department of Neurology, Yale University School of Medicine, New Haven; and the Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven
| | - Jianying Huang
- From the Department of Neurology, Yale University School of Medicine, New Haven; and the Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven
| | - Stephen G Waxman
- From the Department of Neurology, Yale University School of Medicine, New Haven; and the Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven.
| |
Collapse
|
148
|
Roostaei T, Sadaghiani S, Park MTM, Mashhadi R, Nazeri A, Noshad S, Salehi MJ, Naghibzadeh M, Moghadasi AN, Owji M, Doosti R, Taheri APH, Rad AS, Azimi A, Chakravarty MM, Voineskos AN, Nazeri A, Sahraian MA. Channelopathy-related SCN10A gene variants predict cerebellar dysfunction in multiple sclerosis. Neurology 2016; 86:410-7. [PMID: 26740675 DOI: 10.1212/wnl.0000000000002326] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2014] [Accepted: 07/27/2015] [Indexed: 12/19/2022] Open
Abstract
OBJECTIVE To determine the motor-behavioral and neural correlates of putative functional common variants in the sodium-channel NaV1.8 encoding gene (SCN10A) in vivo in patients with multiple sclerosis (MS). METHODS We recruited 161 patients with relapsing-onset MS and 94 demographically comparable healthy participants. All patients with MS underwent structural MRI and clinical examinations (Expanded Disability Status Scale [EDSS] and Multiple Sclerosis Functional Composite [MSFC]). Whole-brain voxel-wise and cerebellar volumetry were performed to assess differences in regional brain volumes between genotype groups. Resting-state fMRI was acquired from 62 patients with MS to evaluate differences in cerebellar functional connectivity. All participants were genotyped for 4 potentially functional SCN10A polymorphisms. RESULTS Two SCN10A polymorphisms in high linkage disequilibrium (r(2) = 0.95) showed significant association with MSFC performance in patients with MS (rs6795970: p = 6.2 × 10(-4); rs6801957: p = 0.0025). Patients with MS with rs6795970(AA) genotype performed significantly worse than rs6795970(G) carriers in MSFC (p = 1.8 × 10(-4)) and all of its subscores. This association was independent of EDSS and cerebellar atrophy. Although the genotype groups showed no difference in regional brain volumes, rs6795970(AA) carriers demonstrated significantly diminished cerebellar functional connectivity with the thalami and midbrain. No significant SCN10A-genotype effect was observed on MSFC performance in healthy participants. CONCLUSIONS Our data suggest that SCN10A variation substantially influences functional status, including prominent effects on motor coordination in patients with MS. These findings were supported by the effects of this variant on a neural system important for motor coordination, namely cerebello-thalamic circuitry. Overall, our findings add to the emerging evidence that suggests that sodium channel NaV1.8 could serve as a target for future drug-based interventions to treat cerebellar dysfunction in MS.
Collapse
Affiliation(s)
- Tina Roostaei
- From the MS Research Center, Neuroscience Institute (T.R., S.S., Aria Nazeri, S.N., M.N., A.N.M., M.O., R.D., A.A., Arash Nazeri, M.A.S.), Interdisciplinary Neuroscience Research Program (T.R., S.S., M.N., Arash Nazeri), Urology Research Center (R.M.), Department of Neurology (A.N.M., M.A.S.), and Department of Radiology (A.P.H.T., A.S.R.), Tehran University of Medical Sciences, Iran; Kimel Family Translational Imaging-Genetics Laboratory (T.R., A.N.V., Arash Nazeri), Research Imaging Centre, Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto; Department of Psychiatry (T.R., A.N.V., Arash Nazeri), University of Toronto; Cerebral Imaging Centre (M.T.M.P., M.M.C.), Douglas Mental Health Institute, Verdun; Schulich School of Medicine and Dentistry (M.T.M.P.), Western University, London, Canada; Department of Electrical Engineering (M.J.S.), Sharif University of Technology, Tehran, Iran; Department of Neurology (A.A.), Thomas Jefferson University, Philadelphia, PA; and Departments of Psychiatry and Biomedical Engineering (M.M.C.), McGill University, Montreal, Canada
| | - Shokufeh Sadaghiani
- From the MS Research Center, Neuroscience Institute (T.R., S.S., Aria Nazeri, S.N., M.N., A.N.M., M.O., R.D., A.A., Arash Nazeri, M.A.S.), Interdisciplinary Neuroscience Research Program (T.R., S.S., M.N., Arash Nazeri), Urology Research Center (R.M.), Department of Neurology (A.N.M., M.A.S.), and Department of Radiology (A.P.H.T., A.S.R.), Tehran University of Medical Sciences, Iran; Kimel Family Translational Imaging-Genetics Laboratory (T.R., A.N.V., Arash Nazeri), Research Imaging Centre, Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto; Department of Psychiatry (T.R., A.N.V., Arash Nazeri), University of Toronto; Cerebral Imaging Centre (M.T.M.P., M.M.C.), Douglas Mental Health Institute, Verdun; Schulich School of Medicine and Dentistry (M.T.M.P.), Western University, London, Canada; Department of Electrical Engineering (M.J.S.), Sharif University of Technology, Tehran, Iran; Department of Neurology (A.A.), Thomas Jefferson University, Philadelphia, PA; and Departments of Psychiatry and Biomedical Engineering (M.M.C.), McGill University, Montreal, Canada
| | - Min Tae M Park
- From the MS Research Center, Neuroscience Institute (T.R., S.S., Aria Nazeri, S.N., M.N., A.N.M., M.O., R.D., A.A., Arash Nazeri, M.A.S.), Interdisciplinary Neuroscience Research Program (T.R., S.S., M.N., Arash Nazeri), Urology Research Center (R.M.), Department of Neurology (A.N.M., M.A.S.), and Department of Radiology (A.P.H.T., A.S.R.), Tehran University of Medical Sciences, Iran; Kimel Family Translational Imaging-Genetics Laboratory (T.R., A.N.V., Arash Nazeri), Research Imaging Centre, Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto; Department of Psychiatry (T.R., A.N.V., Arash Nazeri), University of Toronto; Cerebral Imaging Centre (M.T.M.P., M.M.C.), Douglas Mental Health Institute, Verdun; Schulich School of Medicine and Dentistry (M.T.M.P.), Western University, London, Canada; Department of Electrical Engineering (M.J.S.), Sharif University of Technology, Tehran, Iran; Department of Neurology (A.A.), Thomas Jefferson University, Philadelphia, PA; and Departments of Psychiatry and Biomedical Engineering (M.M.C.), McGill University, Montreal, Canada
| | - Rahil Mashhadi
- From the MS Research Center, Neuroscience Institute (T.R., S.S., Aria Nazeri, S.N., M.N., A.N.M., M.O., R.D., A.A., Arash Nazeri, M.A.S.), Interdisciplinary Neuroscience Research Program (T.R., S.S., M.N., Arash Nazeri), Urology Research Center (R.M.), Department of Neurology (A.N.M., M.A.S.), and Department of Radiology (A.P.H.T., A.S.R.), Tehran University of Medical Sciences, Iran; Kimel Family Translational Imaging-Genetics Laboratory (T.R., A.N.V., Arash Nazeri), Research Imaging Centre, Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto; Department of Psychiatry (T.R., A.N.V., Arash Nazeri), University of Toronto; Cerebral Imaging Centre (M.T.M.P., M.M.C.), Douglas Mental Health Institute, Verdun; Schulich School of Medicine and Dentistry (M.T.M.P.), Western University, London, Canada; Department of Electrical Engineering (M.J.S.), Sharif University of Technology, Tehran, Iran; Department of Neurology (A.A.), Thomas Jefferson University, Philadelphia, PA; and Departments of Psychiatry and Biomedical Engineering (M.M.C.), McGill University, Montreal, Canada
| | - Aria Nazeri
- From the MS Research Center, Neuroscience Institute (T.R., S.S., Aria Nazeri, S.N., M.N., A.N.M., M.O., R.D., A.A., Arash Nazeri, M.A.S.), Interdisciplinary Neuroscience Research Program (T.R., S.S., M.N., Arash Nazeri), Urology Research Center (R.M.), Department of Neurology (A.N.M., M.A.S.), and Department of Radiology (A.P.H.T., A.S.R.), Tehran University of Medical Sciences, Iran; Kimel Family Translational Imaging-Genetics Laboratory (T.R., A.N.V., Arash Nazeri), Research Imaging Centre, Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto; Department of Psychiatry (T.R., A.N.V., Arash Nazeri), University of Toronto; Cerebral Imaging Centre (M.T.M.P., M.M.C.), Douglas Mental Health Institute, Verdun; Schulich School of Medicine and Dentistry (M.T.M.P.), Western University, London, Canada; Department of Electrical Engineering (M.J.S.), Sharif University of Technology, Tehran, Iran; Department of Neurology (A.A.), Thomas Jefferson University, Philadelphia, PA; and Departments of Psychiatry and Biomedical Engineering (M.M.C.), McGill University, Montreal, Canada
| | - Sina Noshad
- From the MS Research Center, Neuroscience Institute (T.R., S.S., Aria Nazeri, S.N., M.N., A.N.M., M.O., R.D., A.A., Arash Nazeri, M.A.S.), Interdisciplinary Neuroscience Research Program (T.R., S.S., M.N., Arash Nazeri), Urology Research Center (R.M.), Department of Neurology (A.N.M., M.A.S.), and Department of Radiology (A.P.H.T., A.S.R.), Tehran University of Medical Sciences, Iran; Kimel Family Translational Imaging-Genetics Laboratory (T.R., A.N.V., Arash Nazeri), Research Imaging Centre, Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto; Department of Psychiatry (T.R., A.N.V., Arash Nazeri), University of Toronto; Cerebral Imaging Centre (M.T.M.P., M.M.C.), Douglas Mental Health Institute, Verdun; Schulich School of Medicine and Dentistry (M.T.M.P.), Western University, London, Canada; Department of Electrical Engineering (M.J.S.), Sharif University of Technology, Tehran, Iran; Department of Neurology (A.A.), Thomas Jefferson University, Philadelphia, PA; and Departments of Psychiatry and Biomedical Engineering (M.M.C.), McGill University, Montreal, Canada
| | - Mohammad Javad Salehi
- From the MS Research Center, Neuroscience Institute (T.R., S.S., Aria Nazeri, S.N., M.N., A.N.M., M.O., R.D., A.A., Arash Nazeri, M.A.S.), Interdisciplinary Neuroscience Research Program (T.R., S.S., M.N., Arash Nazeri), Urology Research Center (R.M.), Department of Neurology (A.N.M., M.A.S.), and Department of Radiology (A.P.H.T., A.S.R.), Tehran University of Medical Sciences, Iran; Kimel Family Translational Imaging-Genetics Laboratory (T.R., A.N.V., Arash Nazeri), Research Imaging Centre, Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto; Department of Psychiatry (T.R., A.N.V., Arash Nazeri), University of Toronto; Cerebral Imaging Centre (M.T.M.P., M.M.C.), Douglas Mental Health Institute, Verdun; Schulich School of Medicine and Dentistry (M.T.M.P.), Western University, London, Canada; Department of Electrical Engineering (M.J.S.), Sharif University of Technology, Tehran, Iran; Department of Neurology (A.A.), Thomas Jefferson University, Philadelphia, PA; and Departments of Psychiatry and Biomedical Engineering (M.M.C.), McGill University, Montreal, Canada
| | - Maryam Naghibzadeh
- From the MS Research Center, Neuroscience Institute (T.R., S.S., Aria Nazeri, S.N., M.N., A.N.M., M.O., R.D., A.A., Arash Nazeri, M.A.S.), Interdisciplinary Neuroscience Research Program (T.R., S.S., M.N., Arash Nazeri), Urology Research Center (R.M.), Department of Neurology (A.N.M., M.A.S.), and Department of Radiology (A.P.H.T., A.S.R.), Tehran University of Medical Sciences, Iran; Kimel Family Translational Imaging-Genetics Laboratory (T.R., A.N.V., Arash Nazeri), Research Imaging Centre, Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto; Department of Psychiatry (T.R., A.N.V., Arash Nazeri), University of Toronto; Cerebral Imaging Centre (M.T.M.P., M.M.C.), Douglas Mental Health Institute, Verdun; Schulich School of Medicine and Dentistry (M.T.M.P.), Western University, London, Canada; Department of Electrical Engineering (M.J.S.), Sharif University of Technology, Tehran, Iran; Department of Neurology (A.A.), Thomas Jefferson University, Philadelphia, PA; and Departments of Psychiatry and Biomedical Engineering (M.M.C.), McGill University, Montreal, Canada
| | - Abdorreza Naser Moghadasi
- From the MS Research Center, Neuroscience Institute (T.R., S.S., Aria Nazeri, S.N., M.N., A.N.M., M.O., R.D., A.A., Arash Nazeri, M.A.S.), Interdisciplinary Neuroscience Research Program (T.R., S.S., M.N., Arash Nazeri), Urology Research Center (R.M.), Department of Neurology (A.N.M., M.A.S.), and Department of Radiology (A.P.H.T., A.S.R.), Tehran University of Medical Sciences, Iran; Kimel Family Translational Imaging-Genetics Laboratory (T.R., A.N.V., Arash Nazeri), Research Imaging Centre, Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto; Department of Psychiatry (T.R., A.N.V., Arash Nazeri), University of Toronto; Cerebral Imaging Centre (M.T.M.P., M.M.C.), Douglas Mental Health Institute, Verdun; Schulich School of Medicine and Dentistry (M.T.M.P.), Western University, London, Canada; Department of Electrical Engineering (M.J.S.), Sharif University of Technology, Tehran, Iran; Department of Neurology (A.A.), Thomas Jefferson University, Philadelphia, PA; and Departments of Psychiatry and Biomedical Engineering (M.M.C.), McGill University, Montreal, Canada
| | - Mahsa Owji
- From the MS Research Center, Neuroscience Institute (T.R., S.S., Aria Nazeri, S.N., M.N., A.N.M., M.O., R.D., A.A., Arash Nazeri, M.A.S.), Interdisciplinary Neuroscience Research Program (T.R., S.S., M.N., Arash Nazeri), Urology Research Center (R.M.), Department of Neurology (A.N.M., M.A.S.), and Department of Radiology (A.P.H.T., A.S.R.), Tehran University of Medical Sciences, Iran; Kimel Family Translational Imaging-Genetics Laboratory (T.R., A.N.V., Arash Nazeri), Research Imaging Centre, Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto; Department of Psychiatry (T.R., A.N.V., Arash Nazeri), University of Toronto; Cerebral Imaging Centre (M.T.M.P., M.M.C.), Douglas Mental Health Institute, Verdun; Schulich School of Medicine and Dentistry (M.T.M.P.), Western University, London, Canada; Department of Electrical Engineering (M.J.S.), Sharif University of Technology, Tehran, Iran; Department of Neurology (A.A.), Thomas Jefferson University, Philadelphia, PA; and Departments of Psychiatry and Biomedical Engineering (M.M.C.), McGill University, Montreal, Canada
| | - Rozita Doosti
- From the MS Research Center, Neuroscience Institute (T.R., S.S., Aria Nazeri, S.N., M.N., A.N.M., M.O., R.D., A.A., Arash Nazeri, M.A.S.), Interdisciplinary Neuroscience Research Program (T.R., S.S., M.N., Arash Nazeri), Urology Research Center (R.M.), Department of Neurology (A.N.M., M.A.S.), and Department of Radiology (A.P.H.T., A.S.R.), Tehran University of Medical Sciences, Iran; Kimel Family Translational Imaging-Genetics Laboratory (T.R., A.N.V., Arash Nazeri), Research Imaging Centre, Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto; Department of Psychiatry (T.R., A.N.V., Arash Nazeri), University of Toronto; Cerebral Imaging Centre (M.T.M.P., M.M.C.), Douglas Mental Health Institute, Verdun; Schulich School of Medicine and Dentistry (M.T.M.P.), Western University, London, Canada; Department of Electrical Engineering (M.J.S.), Sharif University of Technology, Tehran, Iran; Department of Neurology (A.A.), Thomas Jefferson University, Philadelphia, PA; and Departments of Psychiatry and Biomedical Engineering (M.M.C.), McGill University, Montreal, Canada
| | - Amir Pejman Hashemi Taheri
- From the MS Research Center, Neuroscience Institute (T.R., S.S., Aria Nazeri, S.N., M.N., A.N.M., M.O., R.D., A.A., Arash Nazeri, M.A.S.), Interdisciplinary Neuroscience Research Program (T.R., S.S., M.N., Arash Nazeri), Urology Research Center (R.M.), Department of Neurology (A.N.M., M.A.S.), and Department of Radiology (A.P.H.T., A.S.R.), Tehran University of Medical Sciences, Iran; Kimel Family Translational Imaging-Genetics Laboratory (T.R., A.N.V., Arash Nazeri), Research Imaging Centre, Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto; Department of Psychiatry (T.R., A.N.V., Arash Nazeri), University of Toronto; Cerebral Imaging Centre (M.T.M.P., M.M.C.), Douglas Mental Health Institute, Verdun; Schulich School of Medicine and Dentistry (M.T.M.P.), Western University, London, Canada; Department of Electrical Engineering (M.J.S.), Sharif University of Technology, Tehran, Iran; Department of Neurology (A.A.), Thomas Jefferson University, Philadelphia, PA; and Departments of Psychiatry and Biomedical Engineering (M.M.C.), McGill University, Montreal, Canada
| | - Ali Shakouri Rad
- From the MS Research Center, Neuroscience Institute (T.R., S.S., Aria Nazeri, S.N., M.N., A.N.M., M.O., R.D., A.A., Arash Nazeri, M.A.S.), Interdisciplinary Neuroscience Research Program (T.R., S.S., M.N., Arash Nazeri), Urology Research Center (R.M.), Department of Neurology (A.N.M., M.A.S.), and Department of Radiology (A.P.H.T., A.S.R.), Tehran University of Medical Sciences, Iran; Kimel Family Translational Imaging-Genetics Laboratory (T.R., A.N.V., Arash Nazeri), Research Imaging Centre, Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto; Department of Psychiatry (T.R., A.N.V., Arash Nazeri), University of Toronto; Cerebral Imaging Centre (M.T.M.P., M.M.C.), Douglas Mental Health Institute, Verdun; Schulich School of Medicine and Dentistry (M.T.M.P.), Western University, London, Canada; Department of Electrical Engineering (M.J.S.), Sharif University of Technology, Tehran, Iran; Department of Neurology (A.A.), Thomas Jefferson University, Philadelphia, PA; and Departments of Psychiatry and Biomedical Engineering (M.M.C.), McGill University, Montreal, Canada
| | - Amirreza Azimi
- From the MS Research Center, Neuroscience Institute (T.R., S.S., Aria Nazeri, S.N., M.N., A.N.M., M.O., R.D., A.A., Arash Nazeri, M.A.S.), Interdisciplinary Neuroscience Research Program (T.R., S.S., M.N., Arash Nazeri), Urology Research Center (R.M.), Department of Neurology (A.N.M., M.A.S.), and Department of Radiology (A.P.H.T., A.S.R.), Tehran University of Medical Sciences, Iran; Kimel Family Translational Imaging-Genetics Laboratory (T.R., A.N.V., Arash Nazeri), Research Imaging Centre, Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto; Department of Psychiatry (T.R., A.N.V., Arash Nazeri), University of Toronto; Cerebral Imaging Centre (M.T.M.P., M.M.C.), Douglas Mental Health Institute, Verdun; Schulich School of Medicine and Dentistry (M.T.M.P.), Western University, London, Canada; Department of Electrical Engineering (M.J.S.), Sharif University of Technology, Tehran, Iran; Department of Neurology (A.A.), Thomas Jefferson University, Philadelphia, PA; and Departments of Psychiatry and Biomedical Engineering (M.M.C.), McGill University, Montreal, Canada
| | - M Mallar Chakravarty
- From the MS Research Center, Neuroscience Institute (T.R., S.S., Aria Nazeri, S.N., M.N., A.N.M., M.O., R.D., A.A., Arash Nazeri, M.A.S.), Interdisciplinary Neuroscience Research Program (T.R., S.S., M.N., Arash Nazeri), Urology Research Center (R.M.), Department of Neurology (A.N.M., M.A.S.), and Department of Radiology (A.P.H.T., A.S.R.), Tehran University of Medical Sciences, Iran; Kimel Family Translational Imaging-Genetics Laboratory (T.R., A.N.V., Arash Nazeri), Research Imaging Centre, Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto; Department of Psychiatry (T.R., A.N.V., Arash Nazeri), University of Toronto; Cerebral Imaging Centre (M.T.M.P., M.M.C.), Douglas Mental Health Institute, Verdun; Schulich School of Medicine and Dentistry (M.T.M.P.), Western University, London, Canada; Department of Electrical Engineering (M.J.S.), Sharif University of Technology, Tehran, Iran; Department of Neurology (A.A.), Thomas Jefferson University, Philadelphia, PA; and Departments of Psychiatry and Biomedical Engineering (M.M.C.), McGill University, Montreal, Canada
| | - Aristotle N Voineskos
- From the MS Research Center, Neuroscience Institute (T.R., S.S., Aria Nazeri, S.N., M.N., A.N.M., M.O., R.D., A.A., Arash Nazeri, M.A.S.), Interdisciplinary Neuroscience Research Program (T.R., S.S., M.N., Arash Nazeri), Urology Research Center (R.M.), Department of Neurology (A.N.M., M.A.S.), and Department of Radiology (A.P.H.T., A.S.R.), Tehran University of Medical Sciences, Iran; Kimel Family Translational Imaging-Genetics Laboratory (T.R., A.N.V., Arash Nazeri), Research Imaging Centre, Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto; Department of Psychiatry (T.R., A.N.V., Arash Nazeri), University of Toronto; Cerebral Imaging Centre (M.T.M.P., M.M.C.), Douglas Mental Health Institute, Verdun; Schulich School of Medicine and Dentistry (M.T.M.P.), Western University, London, Canada; Department of Electrical Engineering (M.J.S.), Sharif University of Technology, Tehran, Iran; Department of Neurology (A.A.), Thomas Jefferson University, Philadelphia, PA; and Departments of Psychiatry and Biomedical Engineering (M.M.C.), McGill University, Montreal, Canada
| | - Arash Nazeri
- From the MS Research Center, Neuroscience Institute (T.R., S.S., Aria Nazeri, S.N., M.N., A.N.M., M.O., R.D., A.A., Arash Nazeri, M.A.S.), Interdisciplinary Neuroscience Research Program (T.R., S.S., M.N., Arash Nazeri), Urology Research Center (R.M.), Department of Neurology (A.N.M., M.A.S.), and Department of Radiology (A.P.H.T., A.S.R.), Tehran University of Medical Sciences, Iran; Kimel Family Translational Imaging-Genetics Laboratory (T.R., A.N.V., Arash Nazeri), Research Imaging Centre, Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto; Department of Psychiatry (T.R., A.N.V., Arash Nazeri), University of Toronto; Cerebral Imaging Centre (M.T.M.P., M.M.C.), Douglas Mental Health Institute, Verdun; Schulich School of Medicine and Dentistry (M.T.M.P.), Western University, London, Canada; Department of Electrical Engineering (M.J.S.), Sharif University of Technology, Tehran, Iran; Department of Neurology (A.A.), Thomas Jefferson University, Philadelphia, PA; and Departments of Psychiatry and Biomedical Engineering (M.M.C.), McGill University, Montreal, Canada.
| | - Mohammad Ali Sahraian
- From the MS Research Center, Neuroscience Institute (T.R., S.S., Aria Nazeri, S.N., M.N., A.N.M., M.O., R.D., A.A., Arash Nazeri, M.A.S.), Interdisciplinary Neuroscience Research Program (T.R., S.S., M.N., Arash Nazeri), Urology Research Center (R.M.), Department of Neurology (A.N.M., M.A.S.), and Department of Radiology (A.P.H.T., A.S.R.), Tehran University of Medical Sciences, Iran; Kimel Family Translational Imaging-Genetics Laboratory (T.R., A.N.V., Arash Nazeri), Research Imaging Centre, Campbell Family Mental Health Institute, Centre for Addiction and Mental Health, Toronto; Department of Psychiatry (T.R., A.N.V., Arash Nazeri), University of Toronto; Cerebral Imaging Centre (M.T.M.P., M.M.C.), Douglas Mental Health Institute, Verdun; Schulich School of Medicine and Dentistry (M.T.M.P.), Western University, London, Canada; Department of Electrical Engineering (M.J.S.), Sharif University of Technology, Tehran, Iran; Department of Neurology (A.A.), Thomas Jefferson University, Philadelphia, PA; and Departments of Psychiatry and Biomedical Engineering (M.M.C.), McGill University, Montreal, Canada.
| |
Collapse
|
149
|
|
150
|
pH-dependent inhibition of tetrodotoxin-resistant Na(+) channels by diclofenac in rat nociceptive neurons. Prog Neuropsychopharmacol Biol Psychiatry 2016; 64:35-43. [PMID: 26176424 DOI: 10.1016/j.pnpbp.2015.07.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Revised: 06/18/2015] [Accepted: 07/07/2015] [Indexed: 11/21/2022]
Abstract
Non-steroidal anti-inflammatory drugs (NSAIDs) are widely used for the treatment of inflammatory pain. It is well established that NSAIDs exert their analgesic effects by inhibiting cyclooxygenase to prevent the production of prostaglandins; however, several NSAIDs including diclofenac also modulate other ion channels expressed in nociceptive neurons. In this study, we investigated the pH-dependent effects of diclofenac on tetrodotoxin-resistant (TTX-R) Na(+) channels in rat trigeminal sensory neurons by using the whole-cell patch clamp technique. Diclofenac decreased the peak amplitude of TTX-R Na(+) currents (INa) in a concentration dependent manner. While diclofenac had little effect on the voltage-activation relationship, it significantly shifted the steady-state fast inactivation relationship toward hyperpolarized potentials. Diclofenac increased the extent of use-dependent inhibition of TTX-R Na(+) currents. Diclofenac also significantly accelerated the development of inactivation and retarded the recovery from inactivation of TTX-R Na(+) channels. The effects of diclofenac on TTX-R Na(+) channels were stronger at pH 6.0 than at pH7.4 for most of the parameters tested. Considering that the extracellular pH falls in inflamed tissues, and that TTX-R Na(+) channels expressed on nociceptive neurons are implicated in the prostaglandin-mediated development and maintenance of inflammatory hyperalgesia, our findings could provide an additional analgesic effect of diclofenac under acidic pH conditions.
Collapse
|