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Ong RCS, Beros JL, Fuller K, Wood FM, Melton PE, Rodger J, Fear MW, Barrett L, Stevenson AW, Tang AD. Non-severe thermal burn injuries induce long-lasting downregulation of gene expression in cortical excitatory neurons and microglia. Front Mol Neurosci 2024; 17:1368905. [PMID: 38476460 PMCID: PMC10927825 DOI: 10.3389/fnmol.2024.1368905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Accepted: 02/12/2024] [Indexed: 03/14/2024] Open
Abstract
Burn injuries are devastating traumas, often leading to life-long consequences that extend beyond the observable burn scar. In the context of the nervous system, burn injury patients commonly develop chronic neurological disorders and have been suggested to have impaired motor cortex function, but the long-lasting impact on neurons and glia in the brain is unknown. Using a mouse model of non-severe burn injury, excitatory and inhibitory neurons in the primary motor cortex were labelled with fluorescent proteins using adeno-associated viruses (AAVs). A total of 5 weeks following the burn injury, virus labelled excitatory and inhibitory neurons were isolated using fluorescence-activated cell sorting (FACS). In addition, microglia and astrocytes from the remaining cortical tissue caudal to the motor cortex were immunolabelled and isolated with FACS. Whole transcriptome RNA-sequencing was used to identify any long-lasting changes to gene expression in the different cell types. RNA-seq analysis showed changes to the expression of a small number of genes with known functions in excitatory neurons and microglia, but not in inhibitory neurons or astrocytes. Specifically, genes related to GABA-A receptors in excitatory neurons and several cellular functions in microglia were found to be downregulated in burn injured mice. These findings suggest that non-severe burn injuries lead to long lasting transcriptomic changes in the brain, but only in specific cell types. Our findings provide a broad overview of the long-lasting impact of burn injuries on the central nervous system which may help identify potential therapeutic targets to prevent neurological dysfunction in burn patients.
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Affiliation(s)
- Rebecca C. S. Ong
- Experimental and Regenerative Neuroscience, The University of Western Australia, Crawley, WA, Australia
- Perron Institute for Neurological and Translational Sciences, Nedlands, WA, Australia
| | - Jamie L. Beros
- Experimental and Regenerative Neuroscience, The University of Western Australia, Crawley, WA, Australia
- Perron Institute for Neurological and Translational Sciences, Nedlands, WA, Australia
| | - Kathy Fuller
- School of Biomedical Sciences, The University of Western Australia, Crawley, WA, Australia
| | - Fiona M. Wood
- School of Biomedical Sciences, The University of Western Australia, Crawley, WA, Australia
- Burn Injury Research Unit, The University of Western Australia, Crawley, WA, Australia
- Burns Service of Western Australia, WA Department of Health, Murdoch, WA, Australia
- Paediatric Burn Care, Telethon Kids Institute, Nedlands, WA, Australia
| | - Phillip E. Melton
- Menzies Institute for Medical Research, University of Tasmania, Hobart, TAS, Australia
- School of Global and Population Health, The University of Western Australia, Crawley, WA, Australia
| | - Jennifer Rodger
- Experimental and Regenerative Neuroscience, The University of Western Australia, Crawley, WA, Australia
- Perron Institute for Neurological and Translational Sciences, Nedlands, WA, Australia
| | - Mark W. Fear
- School of Biomedical Sciences, The University of Western Australia, Crawley, WA, Australia
| | - Lucy Barrett
- School of Biomedical Sciences, The University of Western Australia, Crawley, WA, Australia
- Burn Injury Research Unit, The University of Western Australia, Crawley, WA, Australia
- Burns Service of Western Australia, WA Department of Health, Murdoch, WA, Australia
| | - Andrew W. Stevenson
- School of Biomedical Sciences, The University of Western Australia, Crawley, WA, Australia
- Burn Injury Research Unit, The University of Western Australia, Crawley, WA, Australia
| | - Alexander D. Tang
- Experimental and Regenerative Neuroscience, The University of Western Australia, Crawley, WA, Australia
- Perron Institute for Neurological and Translational Sciences, Nedlands, WA, Australia
- School of Biomedical Sciences, The University of Western Australia, Crawley, WA, Australia
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2
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Ovsepian SV, Waxman SG. Gene therapy for chronic pain: emerging opportunities in target-rich peripheral nociceptors. Nat Rev Neurosci 2023; 24:252-265. [PMID: 36658346 DOI: 10.1038/s41583-022-00673-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/22/2022] [Indexed: 01/20/2023]
Abstract
With sweeping advances in precision delivery systems and manipulation of the genomes and transcriptomes of various cell types, medical biotechnology offers unprecedented selectivity for and control of a wide variety of biological processes, forging new opportunities for therapeutic interventions. This perspective summarizes state-of-the-art gene therapies enabled by recent innovations, with an emphasis on the expanding universe of molecular targets that govern the activity and function of primary sensory neurons and which might be exploited to effectively treat chronic pain.
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Affiliation(s)
- Saak V Ovsepian
- School of Science, Faculty of Engineering and Science, University of Greenwich London, Chatham Maritime, UK.
| | - Stephen G Waxman
- Department of Neurology, Yale University School of Medicine, New Haven, CT, USA.
- Department of Neuroscience, Yale University School of Medicine, New Haven, CT, USA.
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT, USA.
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3
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Tyagi S, Sarveswaran N, Higerd-Rusli GP, Liu S, Dib-Hajj FB, Waxman SG, Dib-Hajj SD. Conserved but not critical: Trafficking and function of NaV1.7 are independent of highly conserved polybasic motifs. Front Mol Neurosci 2023; 16:1161028. [PMID: 37008789 PMCID: PMC10060856 DOI: 10.3389/fnmol.2023.1161028] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Accepted: 03/02/2023] [Indexed: 03/18/2023] Open
Abstract
Non-addictive treatment of chronic pain represents a major unmet clinical need. Peripheral voltage-gated sodium (NaV) channels are an attractive target for pain therapy because they initiate and propagate action potentials in primary afferents that detect and transduce noxious stimuli. NaV1.7 sets the gain on peripheral pain-signaling neurons and is the best validated peripheral ion channel involved in human pain, and previous work has shown that it is transported in vesicles in sensory axons which also carry Rab6a, a small GTPase known to be involved in vesicular packaging and axonal transport. Understanding the mechanism of the association between Rab6a and NaV1.7 could inform therapeutic modalities to decrease trafficking of NaV1.7 to the distal axonal membrane. Polybasic motifs (PBM) have been shown to regulate Rab-protein interactions in a variety of contexts. In this study, we explored whether two PBMs in the cytoplasmic loop that joins domains I and II of human NaV1.7 were responsible for association with Rab6a and regulate axonal trafficking of the channel. Using site-directed mutagenesis we generated NaV1.7 constructs with alanine substitutions in the two PBMs. Voltage-clamp recordings showed that the constructs retain wild-type like gating properties. Optical Pulse-chase Axonal Long-distance (OPAL) imaging in live sensory axons shows that mutations of these PBMs do not affect co-trafficking of Rab6a and NaV1.7, or the accumulation of the channel at the distal axonal surface. Thus, these polybasic motifs are not required for interaction of NaV1.7 with the Rab6a GTPase, or for trafficking of the channel to the plasma membrane.
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Affiliation(s)
- Sidharth Tyagi
- Medical Scientist Training Program, Yale School of Medicine, New Haven, CT, United States
- Center for Neuroscience and Regeneration Research, West Haven, CT, United States
- Department of Neurology, Yale School of Medicine, New Haven, CT, United States
- Center for Restoration of Nervous System Function, VA Connecticut Healthcare System, West Haven, CT, United States
| | - Nivedita Sarveswaran
- Center for Neuroscience and Regeneration Research, West Haven, CT, United States
- Department of Neurology, Yale School of Medicine, New Haven, CT, United States
- Center for Restoration of Nervous System Function, VA Connecticut Healthcare System, West Haven, CT, United States
| | - Grant P. Higerd-Rusli
- Medical Scientist Training Program, Yale School of Medicine, New Haven, CT, United States
- Center for Neuroscience and Regeneration Research, West Haven, CT, United States
- Department of Neurology, Yale School of Medicine, New Haven, CT, United States
- Center for Restoration of Nervous System Function, VA Connecticut Healthcare System, West Haven, CT, United States
| | - Shujun Liu
- Center for Neuroscience and Regeneration Research, West Haven, CT, United States
- Department of Neurology, Yale School of Medicine, New Haven, CT, United States
- Center for Restoration of Nervous System Function, VA Connecticut Healthcare System, West Haven, CT, United States
| | - Fadia B. Dib-Hajj
- Center for Neuroscience and Regeneration Research, West Haven, CT, United States
- Department of Neurology, Yale School of Medicine, New Haven, CT, United States
- Center for Restoration of Nervous System Function, VA Connecticut Healthcare System, West Haven, CT, United States
| | - Stephen G. Waxman
- Center for Neuroscience and Regeneration Research, West Haven, CT, United States
- Department of Neurology, Yale School of Medicine, New Haven, CT, United States
- Center for Restoration of Nervous System Function, VA Connecticut Healthcare System, West Haven, CT, United States
- *Correspondence: Stephen G. Waxman,
| | - Sulayman D. Dib-Hajj
- Center for Neuroscience and Regeneration Research, West Haven, CT, United States
- Department of Neurology, Yale School of Medicine, New Haven, CT, United States
- Center for Restoration of Nervous System Function, VA Connecticut Healthcare System, West Haven, CT, United States
- Sulayman D. Dib-Hajj,
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4
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Zhao X, Li X, Guo H, Liu P, Ma M, Wang Y. Resolvin D1 attenuates mechanical allodynia after burn injury: Involvement of spinal glia, p38 mitogen-activated protein kinase, and brain-derived neurotrophic factor/tropomyosin-related kinase B signaling. Mol Pain 2023; 19:17448069231159970. [PMID: 36765459 PMCID: PMC9986910 DOI: 10.1177/17448069231159970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023] Open
Abstract
Resolvin D1 (RvD1) suppresses inflammatory, postoperative, and neuropathic pain. The present study assessed the roles and mechanisms of RvD1 in mechanical allodynia after burn injury. A rat model of burn injury was established for analyses, and RvD1 was injected intraperitoneally. Pain behavior and the expression levels of spinal dorsal horn Iba-1 (microglia marker), GFAP (astrocyte marker), p-p38 mitogen-activated protein kinase (MAPK), brain-derived neurotrophic factor (BDNF), and tropomyosin-related kinase B (TrkB) were detected by behavioral and immunocytochemical assays. The results showed that RvD1 attenuated mechanical allodynia after burn injury, prevented microglial and astroglial activation, and downregulated p-p38 MAPK in microglia and BDNF/TrkB following burn injury. Similarly, inhibition of p38 MAPK and BDNF/TrkB signaling attenuated mechanical allodynia after burn injury. In addition, inhibition of p38 MAPK prevented spinal microglial activation and downregulated BDNF/TrkB following burn injury. Furthermore, inhibition of BDNF/TrkB signaling prevented spinal microglial activation and downregulated p-p38 MAPK within spinal microglia. Taken together, this study demonstrated that RvD1 might attenuate mechanical allodynia after burn injury by inhibiting spinal cord glial activation, microglial p38 MAPK, and BDNF/TrkB signaling in the spinal dorsal horn.
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Affiliation(s)
- Xiaona Zhao
- Department of Anesthesiology, Pain and Perioperative Medicine, 191599The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Xinxin Li
- Department of Anesthesiology, Pain and Perioperative Medicine, 191599The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Huiling Guo
- Department of Anesthesiology, Pain and Perioperative Medicine, 191599The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Panmei Liu
- Department of Anesthesiology, Pain and Perioperative Medicine, 191599The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Minyu Ma
- Department of Anesthesiology, Pain and Perioperative Medicine, 191599The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Yanping Wang
- Department of Anesthesiology, Pain and Perioperative Medicine, 191599The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
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5
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Moradi Tuchayi S, Wang Y, Khodorova A, Pence IJ, Evans CL, Anderson RR, Lerner EA, Woolf CJ, Garibyan L. Cryoneurolysis with Injectable Ice Slurry Modulates Mechanical Skin Pain. J Invest Dermatol 2023; 143:134-141.e1. [PMID: 35985498 DOI: 10.1016/j.jid.2022.07.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 06/30/2022] [Accepted: 07/21/2022] [Indexed: 11/16/2022]
Abstract
Cutaneous pain is a common symptom of skin disease, and available therapies are inadequate. We developed a neural selective and injectable method of cryoneurolysis with ice slurry, which leads to a long-lasting decrease in mechanical pain. The aim of this study is to determine whether slurry injection reduces cutaneous pain without inducing the side effects associated with conventional cryoneurolysis. Using the rat sciatic nerve, we examined the effects of slurry on nerve structure and function in comparison with the effects of a Food and Drug Administration‒approved cryoneurolysis device (Iovera). Coherent anti-Stokes Raman scattering microscopy and immunofluorescence staining were used to investigate histological effects on the sciatic nerve and on downstream cutaneous nerve fibers. Complete Freund's Adjuvant model of cutaneous pain was used to study the effect of the slurry on reducing pain. Structural changes in myelin induced by slurry were comparable with those induced by Iovera, which uses much colder temperatures. Compared with that of Iovera, the decrease in mechanical pain due to slurry was less profound but lasted longer without signs of dysesthesia. Slurry did not cause a reduction of epidermal nerve fibers or a change in thermal pain sensitivity. Slurry-treated rats showed reduced cutaneous mechanical pain in response to Complete Freund's Adjuvant. Slurry injection can be used to successfully reduce cutaneous pain without causing dysesthesia.
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Affiliation(s)
- Sara Moradi Tuchayi
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts, USA; Department of Dermatology, Harvard Medical School, Boston, Massachusetts, USA
| | - Ying Wang
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts, USA; Department of Dermatology, Harvard Medical School, Boston, Massachusetts, USA
| | - Alla Khodorova
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts, USA; Department of Dermatology, Harvard Medical School, Boston, Massachusetts, USA
| | - Isaac J Pence
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts, USA; Department of Dermatology, Harvard Medical School, Boston, Massachusetts, USA
| | - Conor L Evans
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts, USA; Department of Dermatology, Harvard Medical School, Boston, Massachusetts, USA
| | - R Rox Anderson
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts, USA; Department of Dermatology, Harvard Medical School, Boston, Massachusetts, USA
| | - Ethan A Lerner
- Department of Dermatology, Harvard Medical School, Boston, Massachusetts, USA; Cutaneous Biology Research Center, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Clifford J Woolf
- F.M. Kirby Neurobiology Center, Boston Children's Hospital, Boston, Massachusetts, USA; Department of Neurobiology, Harvard Medical School, Boston, Massachusetts, USA
| | - Lilit Garibyan
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts, USA; Department of Dermatology, Harvard Medical School, Boston, Massachusetts, USA.
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6
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Effraim PR, Estacion M, Zhao P, Sosniak D, Waxman SG, Dib-Hajj SD. Fibroblast growth factor homologous factor 2 attenuates excitability of DRG neurons. J Neurophysiol 2022; 128:1258-1266. [PMID: 36222860 PMCID: PMC9909838 DOI: 10.1152/jn.00361.2022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Fibroblast growth factor homologous factors (FHFs) are cytosolic members of the superfamily of the FGF proteins. Four members of this subfamily (FHF1-4) are differentially expressed in multiple tissues in an isoform-dependent manner. Mutations in FHF proteins have been associated with multiple neurological disorders. FHF proteins bind to the COOH terminus of voltage-gated sodium (Nav) channels and regulate current amplitude and gating properties of these channels. FHF2, which is expressed in dorsal root ganglia (DRG) neurons, has two main splicing isoforms: FHF2A and FHF2B, which differ in the length and sequence of their NH2 termini, have been shown to differentially regulate gating properties of Nav1.7, a channel that is a major driver of DRG neuron firing. FHF2 expression levels are downregulated after peripheral nerve axotomy, which suggests that they may regulate neuronal excitability via an action on Nav channels after injury. We have previously shown that knockdown of FHF2 leads to gain-of-function changes in Nav1.7 gating properties: enhanced repriming, increased current density, and hyperpolarized activation. From this we posited that knockdown of FHF2 might also lead to DRG hyperexcitability. Here we show that knockdown of either FHF2A alone or all isoforms of FHF2 results in increased DRG neuron excitability. In addition, we demonstrate that supplementation of FHF2A and FHF2B reduces DRG neuron excitability. Overexpression of FHF2A or FHF2B also reduced excitability of DRG neurons treated with a cocktail of inflammatory mediators, a model of inflammatory pain. Our data suggest that increased neuronal excitability after nerve injury might be triggered, in part, via a loss of FHF2-Nav1.7 interaction.NEW & NOTEWORTHY FHF2 is known to bind to and modulate the function of Nav1.7. FHF2 expression is also reduced after nerve injury. We demonstrate that knockdown of FHF2 expression increases DRG neuronal excitability. More importantly, overexpression of FHF2 reduces DRG excitability in basal conditions and in the presence of inflammatory mediators (a model of inflammatory pain). These results suggest that FHF2 could potentially be used as a tool to reduce DRG neuronal excitability and to treat pain.
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Affiliation(s)
- Philip R. Effraim
- Department of Anesthesiology, Yale University School of Medicine, New Haven, CT 06510
- Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, CT 06510, USA
- Center for Rehabilitation Research, VA Connecticut Healthcare System, West Haven, CT 06516, USA
| | - Mark Estacion
- Department of Neurology, Yale University School of Medicine, New Haven, CT 06510
- Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, CT 06510, USA
- Center for Rehabilitation Research, VA Connecticut Healthcare System, West Haven, CT 06516, USA
| | - Peng Zhao
- Department of Neurology, Yale University School of Medicine, New Haven, CT 06510
- Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, CT 06510, USA
- Center for Rehabilitation Research, VA Connecticut Healthcare System, West Haven, CT 06516, USA
| | - Daniel Sosniak
- Department of Neurology, Yale University School of Medicine, New Haven, CT 06510
- Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, CT 06510, USA
- Center for Rehabilitation Research, VA Connecticut Healthcare System, West Haven, CT 06516, USA
| | - Stephen G Waxman
- Department of Neurology, Yale University School of Medicine, New Haven, CT 06510
- Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, CT 06510, USA
- Center for Rehabilitation Research, VA Connecticut Healthcare System, West Haven, CT 06516, USA
| | - Sulayman D. Dib-Hajj
- Department of Neurology, Yale University School of Medicine, New Haven, CT 06510
- Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, CT 06510, USA
- Center for Rehabilitation Research, VA Connecticut Healthcare System, West Haven, CT 06516, USA
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7
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Liu XG. Normalization of Neuroinflammation: A New Strategy for Treatment of Persistent Pain and Memory/Emotional Deficits in Chronic Pain. J Inflamm Res 2022; 15:5201-5233. [PMID: 36110505 PMCID: PMC9469940 DOI: 10.2147/jir.s379093] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Accepted: 08/18/2022] [Indexed: 12/12/2022] Open
Abstract
Chronic pain, which affects around 1/3 of the world population and is often comorbid with memory deficit and mood depression, is a leading source of suffering and disability. Studies in past decades have shown that hyperexcitability of primary sensory neurons resulting from abnormal expression of ion channels and central sensitization mediated pathological synaptic plasticity, such as long-term potentiation in spinal dorsal horn, underlie the persistent pain. The memory/emotional deficits are associated with impaired synaptic connectivity in hippocampus. Dysregulation of numerous endogenous proteins including receptors and intracellular signaling molecules is involved in the pathological processes. However, increasing knowledge contributes little to clinical treatment. Emerging evidence has demonstrated that the neuroinflammation, characterized by overproduction of pro-inflammatory cytokines and glial activation, is reliably detected in humans and animals with chronic pain, and is sufficient to induce persistent pain and memory/emotional deficits. The abnormal expression of ion channels and pathological synaptic plasticity in spinal dorsal horn and in hippocampus are resulting from neuroinflammation. The neuroinflammation is initiated and maintained by the interactions of circulating monocytes, glial cells and neurons. Obviously, unlike infectious diseases and cancer, which are caused by pathogens or malignant cells, chronic pain is resulting from alterations of cells and molecules which have numerous physiological functions. Therefore, normalization (counterbalance) but not simple inhibition of the neuroinflammation is the right strategy for treating neuronal disorders. Currently, no such agent is available in clinic. While experimental studies have demonstrated that intracellular Mg2+ deficiency is a common feature of chronic pain in animal models and supplement Mg2+ are capable of normalizing the neuroinflammation, activation of upregulated proteins that promote recovery, such as translocator protein (18k Da) or liver X receptors, has a similar effect. In this article, relevant experimental and clinical evidence is reviewed and discussed.
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Affiliation(s)
- Xian-Guo Liu
- Pain Research Center and Department of Physiology, Zhongshan School of Medicine of Sun Yat-sen University, Guangzhou, People's Republic of China
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8
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Roy TK, Uniyal A, Tiwari V. Multifactorial pathways in burn injury-induced chronic pain: novel targets and their pharmacological modulation. Mol Biol Rep 2022; 49:12121-12132. [PMID: 35842856 DOI: 10.1007/s11033-022-07748-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 06/22/2022] [Accepted: 06/23/2022] [Indexed: 11/30/2022]
Abstract
Burn injuries are among the highly prevalent medical conditions worldwide that occur mainly in children, military veterans and victims of fire accidents. It is one of the leading causes of temporary as well as permanent disabilities in patients. Burn injuries are accompanied by pain that persists even after recovery from tissue damage which puts immense pressure on the healthcare system. The pathophysiology of burn pain is poorly understood due to its complex nature and lack of considerable preclinical and clinical shreds of evidence, that creates a substantial barrier to the development of new analgesics. Burns damage the skin layers supplied with nociceptors such as NAV1.7, TRPV1, and TRPA1. Burn injury-mediated co-localization and simultaneous activation of TRPA1 and TRPV1 in nociceptive primary afferent C-fibers which contributes to the development and maintenance of chronic pain. Burn injuries are accompanied by central sensitization, a key feature of pain pathophysiology mainly driven by a series of cascades involving aberrations in the glutamatergic system, microglial activation, release of neuropeptides, cytokines, and chemokines. Activation of p38 mitogen-activated protein kinase, altered endogenous opioid signaling, and distorted genomic expression are other pathophysiological factors responsible for the development and maintenance of burn pain. Here we discuss comprehensive literature on molecular mechanisms of burn pain and potential targets that could be translated into near future therapeutics.
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Affiliation(s)
- Tapas Kumar Roy
- Neuroscience & Pain Research Laboratory, Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology, Banaras Hindu University, 221005, Varanasi, U.P, India
| | - Ankit Uniyal
- Neuroscience & Pain Research Laboratory, Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology, Banaras Hindu University, 221005, Varanasi, U.P, India
| | - Vinod Tiwari
- Neuroscience & Pain Research Laboratory, Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology, Banaras Hindu University, 221005, Varanasi, U.P, India.
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9
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Neuroimmune Mechanisms Underlying Neuropathic Pain: The Potential Role of TNF-α-Necroptosis Pathway. Int J Mol Sci 2022; 23:ijms23137191. [PMID: 35806192 PMCID: PMC9266916 DOI: 10.3390/ijms23137191] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 06/24/2022] [Accepted: 06/27/2022] [Indexed: 02/05/2023] Open
Abstract
The neuroimmune mechanism underlying neuropathic pain has been extensively studied. Tumor necrosis factor-alpha (TNF-α), a key pro-inflammatory cytokine that drives cytokine storm and stimulates a cascade of other cytokines in pain-related pathways, induces and modulates neuropathic pain by facilitating peripheral (primary afferents) and central (spinal cord) sensitization. Functionally, TNF-α controls the balance between cell survival and death by inducing an inflammatory response and two programmed cell death mechanisms (apoptosis and necroptosis). Necroptosis, a novel form of programmed cell death, is receiving increasing attraction and may trigger neuroinflammation to promote neuropathic pain. Chronic pain is often accompanied by adverse pain-associated emotional reactions and cognitive disorders. Overproduction of TNF-α in supraspinal structures such as the anterior cingulate cortex (ACC) and hippocampus plays an important role in pain-associated emotional disorders and memory deficits and also participates in the modulation of pain transduction. At present, studies reporting on the role of the TNF-α–necroptosis pathway in pain-related disorders are lacking. This review indicates the important research prospects of this pathway in pain modulation based on its role in anxiety, depression and memory deficits associated with other neurodegenerative diseases. In addition, we have summarized studies related to the underlying mechanisms of neuropathic pain mediated by TNF-α and discussed the role of the TNF-α–necroptosis pathway in detail, which may represent an avenue for future therapeutic intervention.
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10
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Spinal microglia-derived TNF promotes the astrocytic JNK/CXCL1 pathway activation in a mouse model of burn pain. Brain Behav Immun 2022; 102:23-39. [PMID: 35143878 DOI: 10.1016/j.bbi.2022.02.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 01/28/2022] [Accepted: 02/04/2022] [Indexed: 11/21/2022] Open
Abstract
Burn injury-induced pain (BIP) is an extremely complicated condition usually resistant to analgesic drugs, while its pathogenesis remains unknown. Considerable attention has been attracted to elucidate the glial mechanisms in chronic pain. In this study, we initiatively used a mouse model of second-degree BIP to investigate the underlying non-neuronal mechanisms at the spinal cord level. Our behavioral results showed that hind-paw burn injury caused persistent allodynia and hyperalgesia for 2 weeks in mice. Further studies revealed that both microglia and astrocytes activated in a spatially- and temporally-dependent manner in spinal cord after burn injury. In addition, the phosphorylated p38 mitogen-activated protein kinase (MAPK)-mediated tumor necrosis factor (TNF) release in spinal microglia is essentially attributed to the early stage of BIP, while the c-Jun N-terminal kinase (JNK) MAPK-dependent chemokine CXCL1 expression is mainly involved in the maintenance of pain hypersensitivity. Most strikingly, burn injury-induced pain symptoms and the activation of astrocytes were significantly suppressed by TNF inhibitor Thalidomide. On the contrary, intrathecal injection of TNF caused apparent pain hypersensitivity, accompanied by the activation of astrocytes and the upregulation of CXCL1 via the JNK MAPK signaling pathway, indicating that TNF is the key cytokine in the interaction between microglia and astrocytes at the spinal level. Moreover, treatment with the CXCR2 receptor antagonist SB225002 to block the biological activities of CXCL1 significantly attenuated the mechanical allodynia and thermal hyperalgesia in this BIP model. Taken together, this study indicates that intervention of glial pathways provides a new perspective in the management of BIP.
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11
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Fouda MA, Ghovanloo MR, Ruben PC. Late sodium current: incomplete inactivation triggers seizures, myotonias, arrhythmias, and pain syndromes. J Physiol 2022; 600:2835-2851. [PMID: 35436004 DOI: 10.1113/jp282768] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 04/12/2022] [Indexed: 11/08/2022] Open
Abstract
Acquired and inherited dysfunction in voltage-gated sodium channels underlies a wide range of diseases. "In addition to the defects in trafficking and expression, sodium channelopathies are also caused by dysfunction in one or several gating properties, for instance activation or inactivation. Disruption of the channel inactivation leads to the increased late sodium current, which is a common defect in seizure disorders, cardiac arrhythmias skeletal muscle myotonia and pain. An increase in late sodium current leads to repetitive action potential in neurons and skeletal muscles, and prolonged action potential duration in the heart. In this topical review, we compare the effects of late sodium current in brain, heart, skeletal muscle, and peripheral nerves. Abstract figure legend Shows cartoon illustration of general Nav channel transitions between (1) resting, (2) open, and (3) fast inactivated states. Disruption of the inactivation process exacerbates (4) late sodium currents. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Mohamed A Fouda
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, Canada.,Department of Pharmacology and Toxicology, Alexandria University, Alexandria, Egypt
| | | | - Peter C Ruben
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, Canada
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12
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Wang X, Zhang B, Li X, Liu X, Wang S, Xie Y, Pi J, Yang Z, Li J, Jia Q, Zhang Y. Mechanisms Underlying Gastrodin Alleviating Vincristine-Induced Peripheral Neuropathic Pain. Front Pharmacol 2022; 12:744663. [PMID: 34975470 PMCID: PMC8716817 DOI: 10.3389/fphar.2021.744663] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Accepted: 11/30/2021] [Indexed: 12/16/2022] Open
Abstract
Gastrodin (GAS) is the main bioactive ingredient of Gastrodia, a famous Chinese herbal medicine widely used as an analgesic, but the underlying analgesic mechanism is still unclear. In this study, we first observed the effects of GAS on the vincristine-induced peripheral neuropathic pain by alleviating the mechanical and thermal hyperalgesia. Further studies showed that GAS could inhibit the current density of NaV1.7 and NaV1.8 channels and accelerate the inactivation process of NaV1.7 and NaV1.8 channel, thereby inhibiting the hyperexcitability of neurons. Additionally, GAS could significantly reduce the over-expression of NaV1.7 and NaV1.8 on DRG neurons from vincristine-treated rats according to the analysis of Western blot and immunofluorescence results. Moreover, based on the molecular docking and molecular dynamic simulation, the binding free energies of the constructed systems were calculated, and the binding sites of GAS on the sodium channels (NaV1.7 and NaV1.8) were preliminarily determined. This study has shown that modulation of NaV1.7 and NaV1.8 sodium channels by GAS contributing to the alleviation of vincristine-induced peripheral neuropathic pain, thus expanding the understanding of complex action of GAS as a neuromodulator.
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Affiliation(s)
- Xiangyu Wang
- Departments of Pharmacology, Hebei Medical University, Shijiazhuang, China
| | - Boxuan Zhang
- Departments of Pharmacology, Hebei Medical University, Shijiazhuang, China
| | - Xuedong Li
- School of Pharmacy, Hebei Medical University, Shijiazhuang, China.,Laboratory of Neural and Vascular Biology of Ministry of Education, Hebei Medical University, Shijiazhuang, China
| | - Xingang Liu
- Departments of Pharmacology, Hebei Medical University, Shijiazhuang, China
| | - Songsong Wang
- Departments of Pharmacology, Hebei Medical University, Shijiazhuang, China
| | - Yuan Xie
- Departments of Pharmacology, Hebei Medical University, Shijiazhuang, China
| | - Jialing Pi
- Departments of Pharmacology, Hebei Medical University, Shijiazhuang, China
| | - Zhiyuan Yang
- Departments of Pharmacology, Hebei Medical University, Shijiazhuang, China
| | - Jincan Li
- Departments of Pharmacology, Hebei Medical University, Shijiazhuang, China
| | - Qingzhong Jia
- Departments of Pharmacology, Hebei Medical University, Shijiazhuang, China.,School of Pharmacy, Hebei Medical University, Shijiazhuang, China.,Key Laboratory of Innovative Drug Research and Evaluation of Hebei Province, Shijiazhuang, China.,Laboratory of Neural and Vascular Biology of Ministry of Education, Hebei Medical University, Shijiazhuang, China
| | - Yang Zhang
- School of Pharmacy, Hebei Medical University, Shijiazhuang, China.,Laboratory of Neural and Vascular Biology of Ministry of Education, Hebei Medical University, Shijiazhuang, China
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13
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Nguyen PT, Nguyen HM, Wagner KM, Stewart RG, Singh V, Thapa P, Chen YJ, Lillya MW, Ton AT, Kondo R, Ghetti A, Pennington MW, Hammock B, Griffith TN, Sack JT, Wulff H, Yarov-Yarovoy V. Computational design of peptides to target Na V1.7 channel with high potency and selectivity for the treatment of pain. eLife 2022; 11:81727. [PMID: 36576241 PMCID: PMC9831606 DOI: 10.7554/elife.81727] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2022] [Accepted: 12/23/2022] [Indexed: 12/29/2022] Open
Abstract
The voltage-gated sodium NaV1.7 channel plays a key role as a mediator of action potential propagation in C-fiber nociceptors and is an established molecular target for pain therapy. ProTx-II is a potent and moderately selective peptide toxin from tarantula venom that inhibits human NaV1.7 activation. Here we used available structural and experimental data to guide Rosetta design of potent and selective ProTx-II-based peptide inhibitors of human NaV1.7 channels. Functional testing of designed peptides using electrophysiology identified the PTx2-3127 and PTx2-3258 peptides with IC50s of 7 nM and 4 nM for hNaV1.7 and more than 1000-fold selectivity over human NaV1.1, NaV1.3, NaV1.4, NaV1.5, NaV1.8, and NaV1.9 channels. PTx2-3127 inhibits NaV1.7 currents in mouse and human sensory neurons and shows efficacy in rat models of chronic and thermal pain when administered intrathecally. Rationally designed peptide inhibitors of human NaV1.7 channels have transformative potential to define a new class of biologics to treat pain.
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Affiliation(s)
- Phuong T Nguyen
- Department of Physiology and Membrane Biology, University of California DavisDavisUnited States
| | - Hai M Nguyen
- Department of Pharmacology, University of California DavisDavisUnited States
| | - Karen M Wagner
- Department of Entomology and Nematology & Comprehensive Cancer Center, University of California DavisDavisUnited States
| | - Robert G Stewart
- Department of Physiology and Membrane Biology, University of California DavisDavisUnited States
| | - Vikrant Singh
- Department of Pharmacology, University of California DavisDavisUnited States
| | - Parashar Thapa
- Department of Physiology and Membrane Biology, University of California DavisDavisUnited States
| | - Yi-Je Chen
- Department of Pharmacology, University of California DavisDavisUnited States
| | - Mark W Lillya
- Department of Physiology and Membrane Biology, University of California DavisDavisUnited States
| | | | | | | | | | - Bruce Hammock
- Department of Entomology and Nematology & Comprehensive Cancer Center, University of California DavisDavisUnited States
| | - Theanne N Griffith
- Department of Physiology and Membrane Biology, University of California DavisDavisUnited States
| | - Jon T Sack
- Department of Physiology and Membrane Biology, University of California DavisDavisUnited States,Department of Anesthesiology and Pain Medicine, University of California DavisDavisUnited States
| | - Heike Wulff
- Department of Pharmacology, University of California DavisDavisUnited States
| | - Vladimir Yarov-Yarovoy
- Department of Physiology and Membrane Biology, University of California DavisDavisUnited States,Department of Anesthesiology and Pain Medicine, University of California DavisDavisUnited States,Biophysics Graduate Group, University of California DavisDavisUnited States
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14
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Chidiac C, Xue Y, Muniz Moreno MDM, Bakr Rasheed AA, Lorentz R, Birling MC, Gaveriaux-Ruff C, Herault Y. The Human SCN10A G1662S Point Mutation Established in Mice Impacts on Mechanical, Heat, and Cool Sensitivity. Front Pharmacol 2021; 12:780132. [PMID: 34925037 PMCID: PMC8671994 DOI: 10.3389/fphar.2021.780132] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Accepted: 11/01/2021] [Indexed: 11/13/2022] Open
Abstract
The voltage-gated sodium channel NAV1.8 is expressed in primary nociceptive neurons and is involved in pain transmission. Mutations in the SCN10A gene (encoding NAV1.8 channel) have been identified in patients with idiopathic painful small fiber neuropathy (SFN) including the SCN10AG1662S gain-of-function mutation. However, the role of this mutation in pain sensation remains unknown. We have generated the first mouse model for the G1662S mutation by using homologous recombination in embryonic stem cells. The corresponding Scn10aG1663S mouse line has been analyzed for Scn10a expression, intraepidermal nerve fiber density (IENFD), and nociception using behavioral tests for thermal and mechanical sensitivity. The Scn10aG1663S mutants had a similar Scn10a expression level in dorsal root ganglia (DRG) to their wild-type littermates and showed normal IENFD in hindpaw skin. Mutant mice were more sensitive to touch than wild types in the von Frey test. In addition, sexual dimorphism was observed for several pain tests, pointing to the relevance of performing the phenotypical assessment in both sexes. Female homozygous mutants tended to be more sensitive to cooling stimuli in the acetone test. For heat sensitivity, male homozygous mutants showed shorter latencies to radiant heat in the Hargreaves test while homozygous females had longer latencies in the tail flick test. In addition, mutant males displayed a shorter reaction latency on the 54°C hot plate. Collectively, Scn10aG1663S mutant mice show a moderate but consistent increased sensitivity in behavioral tests of nociception. This altered nociception found in Scn10aG1663S mice demonstrates that the corresponding G1662 mutation of SCN10A found in SFN patients with pain contributes to their pain symptoms.
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Affiliation(s)
- Celeste Chidiac
- CNRS, INSERM Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Université de Strasbourg, Illkirch, France
| | - Yaping Xue
- CNRS, INSERM Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Université de Strasbourg, Illkirch, France
| | - Maria Del Mar Muniz Moreno
- CNRS, INSERM Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Université de Strasbourg, Illkirch, France
| | - Ameer Abu Bakr Rasheed
- CNRS, INSERM Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Université de Strasbourg, Illkirch, France
| | - Romain Lorentz
- CNRS, INSERM, PHENOMIN-Institut Clinique de la Souris, Université de Strasbourg, Illkirch, France
| | - Marie-Christine Birling
- CNRS, INSERM, PHENOMIN-Institut Clinique de la Souris, Université de Strasbourg, Illkirch, France
| | - Claire Gaveriaux-Ruff
- CNRS, INSERM Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Université de Strasbourg, Illkirch, France
| | - Yann Herault
- CNRS, INSERM Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Université de Strasbourg, Illkirch, France.,CNRS, INSERM, PHENOMIN-Institut Clinique de la Souris, Université de Strasbourg, Illkirch, France
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15
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Wu PY, Menta B, Visk A, Ryals JM, Christianson JA, Wright DE, Chadwick AL. The impact of foot shock-induced stress on pain-related behavior associated with burn injury. Burns 2021; 47:1896-1907. [PMID: 33958242 PMCID: PMC8526636 DOI: 10.1016/j.burns.2021.04.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 04/05/2021] [Accepted: 04/12/2021] [Indexed: 11/21/2022]
Abstract
Acute pain is prevalent following burn injury and can often transition to chronic pain. Prolonged acute pain is an important risk factor for chronic pain and there is little preclinical research to address this problem. Using a mouse model of second-degree burn, we investigated whether pre-existing stress influences pain(sensitivity) after a burn injury. We introduced a contribution of stress in two different ways: (1) the use of foot-shock as a pre-injury stressor or (2) the use of A/J mice to represent higher pre-existing stress compared to C57Bl/6 mice. C57Bl/6 and A/J mice were exposed to repeated mild foot shock to induce stress for 10 continuous days and mice underwent either burn injury or sham burn injury of the plantar surface of the right hind paw. Assessments of mechanical and thermal sensitivities of the injured and uninjured paw were conducted during the shock protocol and at intervals up to 82-day post-burn injury. In both strains of mice that underwent burn injury, thermal hypersensitivity and mechanical allodynia appeared rapidly in the ipsilateral paw. Mice that were stressed took much longer to recover their hind paw mechanical thresholds to baseline compared to non-stressed mice in both burn and non-burn groups. Analysis of the two mouse strains revealed that the recovery of mechanical thresholds in A/J mice which display higher levels of baseline anxiety was shorter than C57Bl/6 mice. No differences were observed regarding thermal sensitivities between strains. Our results support the view that stress exposure prior to burn injury affects mechanical and thermal thresholds and may be relevant to as a risk factor for the transition from acute to chronic pain. Finally, genetic differences may play a key role in modality-specific recovery following burn injury.
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Affiliation(s)
- Pau Yen Wu
- Department of Anatomy and Cell Biology, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Blaise Menta
- Department of Biochemistry, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Alexander Visk
- Department of Anatomy and Cell Biology, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Janelle M Ryals
- Department of Anatomy and Cell Biology, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Julie A Christianson
- Department of Anatomy and Cell Biology, University of Kansas Medical Center, Kansas City, KS 66160, USA; Department of Anesthesiology, University of Kansas Medical Center, Kansas City, KS 66160, USA
| | - Douglas E Wright
- Department of Anatomy and Cell Biology, University of Kansas Medical Center, Kansas City, KS 66160, USA; Department of Anesthesiology, University of Kansas Medical Center, Kansas City, KS 66160, USA.
| | - Andrea L Chadwick
- Department of Anesthesiology, University of Kansas Medical Center, Kansas City, KS 66160, USA
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16
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Alvarez P, Bogen O, Green PG, Levine JD. Nociceptor Overexpression of Na V1.7 Contributes to Chronic Muscle Pain Induced by Early-Life Stress. THE JOURNAL OF PAIN 2021; 22:806-816. [PMID: 33636374 PMCID: PMC8406703 DOI: 10.1016/j.jpain.2021.02.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Revised: 01/27/2021] [Accepted: 02/07/2021] [Indexed: 01/06/2023]
Abstract
Adult rats previously submitted to neonatal limited bedding (NLB), a model of early-life stress, display muscle mechanical hyperalgesia and nociceptor hyperexcitability, the underlying mechanism for which is unknown. Since voltage-gated sodium channel subtype 7 (NaV1.7) contributes to mechanical hyperalgesia in several preclinical pain models and is critical for nociceptor excitability, we explored its role in the muscle hyperalgesia exhibited by adult NLB rats. Western blot analyses demonstrated increased NaV1.7 protein expression in L4-L5 dorsal root ganglia (DRG) from adult NLB rats, and antisense oligodeoxynucleotide (AS ODN) targeting NaV1.7 alpha subunit mRNA attenuated the expression of NaV1.7 in DRG extracts. While this AS ODN did not affect nociceptive threshold in normal rats it significantly attenuated hyperalgesia in NLB rats. The selective NaV1.7 activator OD1 produced dose-dependent mechanical hyperalgesia that was enhanced in NLB rats, whereas the NaV1.7 blocker ProTx-II prevented OD1-induced hyperalgesia in control rats and ongoing hyperalgesia in NLB rats. AS ODN knockdown of extracellular signal-regulated kinase 1/2, which enhances NaV1.7 function, also inhibited mechanical hyperalgesia in NLB rats. Our results support the hypothesis that overexpression of NaV1.7 in muscle nociceptors play a role in chronic muscle pain induced by early-life stress, suggesting that NaV1.7 is a target for the treatment of chronic muscle pain. PERSPECTIVE: We demonstrate that early-life adversity, induced by exposure to inconsistent maternal care, produces chronic muscle hyperalgesia, which depends, at least in part, on increased expression of NaV1.7 in nociceptors.
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Affiliation(s)
- Pedro Alvarez
- Department of Oral and Maxillofacial Surgery, University of California, San Francisco, San Francisco, California
| | - Oliver Bogen
- Department of Oral and Maxillofacial Surgery, University of California, San Francisco, San Francisco, California; UCSF Pain and Addiction Research Center, University of California, San Francisco, San Francisco, California
| | - Paul G Green
- Department of Oral and Maxillofacial Surgery, University of California, San Francisco, San Francisco, California; UCSF Pain and Addiction Research Center, University of California, San Francisco, San Francisco, California; Department of Preventative and Restorative Dental Sciences, University of California, San Francisco, San Francisco, California
| | - Jon D Levine
- Department of Oral and Maxillofacial Surgery, University of California, San Francisco, San Francisco, California; UCSF Pain and Addiction Research Center, University of California, San Francisco, San Francisco, California; Department of Medicine, University of California San Francisco, San Francisco, California.
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17
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Foxo1 selectively regulates static mechanical pain by interacting with Nav1.7. Pain 2021; 162:490-502. [PMID: 32868747 DOI: 10.1097/j.pain.0000000000002055] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Accepted: 08/14/2020] [Indexed: 02/07/2023]
Abstract
ABSTRACT Mechanical allodynia is a debilitating condition for millions of patients with chronic pain. Mechanical allodynia can manifest in distinct forms, including brush-evoked dynamic and filament-evoked static allodynia. In the nervous system, the forkhead protein Foxo1 plays a critical role in neuronal structures and functions. However, the role of Foxo1 in the somatosensory signal remains unclear. Here, we found that Foxo1 selectively regulated static mechanical pain. Foxo1 knockdown decreased sensitivity to static mechanical stimuli in normal rats and attenuated static mechanical allodynia in rat models for neuropathic, inflammatory, and chemotherapy pain. Conversely, Foxo1 overexpression selectively enhanced sensitivity to static mechanical stimuli and provoked static mechanical allodynia. Furthermore, Foxo1 interacted with voltage-gated sodium Nav1.7 channels and increased the Nav1.7 current density by accelerating activation rather than by changing the expression of Nav1.7 in dorsal root ganglia neurons. In addition, the serum level of Foxo1 was found to be increased in chronic pain patients and to be positively correlated with the severity of chronic pain. Altogether, our findings suggest that serum Foxo1 level could be used as a biological marker for prediction and diagnosis of chronic pain. Moreover, selective blockade of Foxo1/Nav1.7 interaction may offer a new therapeutic approach in patients with mechanical pain.
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18
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Spinal endomorphins attenuate burn-injury pain in male mice by inhibiting p38 MAPK signaling pathway through the mu-opioid receptor. Eur J Pharmacol 2021; 903:174139. [PMID: 33933465 DOI: 10.1016/j.ejphar.2021.174139] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 04/21/2021] [Accepted: 04/26/2021] [Indexed: 11/23/2022]
Abstract
Burn injury is one of the main causes of mortality worldwide and frequently associated with severe and long-lasting pain that compromises the quality of patient life. Several studies have shown that the mu-opioid system plays an important role in burn pain relief. In this study, we investigated the spinal antinociception induced by the endogenous mu-opioid receptor (MOR) agonists endomorphins and explored their mechanisms of actions in burn injury-induced pain model. Our results showed that intrathecal injection of endomorphin-1 and -2 dose-dependently attenuated mechanical allodynia and thermal hyperalgesia via the mu-opioid receptor in mice on day 3 after burn injury, which was consistent with the data obtained from the mu-opioid receptor knockout mice. Western blot showed that the phosphorylation levels of extracellular signal-regulated kinase1/2 (ERK1/2) and p38 mitogen-activated protein kinase (p38 MAPK) in ipsilateral spinal cord tissues were significantly up-regulated after burn injury. Intrathecal injection of endomorphins selectively inhibited the activation of p38 MAPK on day 3 after burn injury via the mu-opioid receptor. Further studies found that repeated application of the specific p38 MAPK inhibitor SB203580 dose-dependently inhibited burn-injury pain, as well as the activation of spinal p38 MAPK. Taken together, our present study demonstrates that intrathecal injection of endomorphins attenuates burn-injury pain in male mice by affecting the spinal activation of p38 MAPK via the mu-opioid receptor.
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19
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Xue Y, Chidiac C, Herault Y, Gaveriaux-Ruff C. Pain behavior in SCN9A (Nav1.7) and SCN10A (Nav1.8) mutant rodent models. Neurosci Lett 2021; 753:135844. [PMID: 33775738 DOI: 10.1016/j.neulet.2021.135844] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 03/18/2021] [Accepted: 03/19/2021] [Indexed: 11/18/2022]
Abstract
The two voltage gated sodium channels Nav1.7 and Nav1.8 are expressed in the peripheral nervous system and involved in various pain conditions including inflammatory and neuropathic pain. Rodent models bearing deletions or mutations of the corresponding genes, Scn9a and Scn10a, were created in order to understand the role of these channels in the pathophysiological mechanism underlying pain symptoms. This review summarizes the pain behavior profiles reported in Scn9a and Scn10a rodent models. The complete loss-of-function or knockout (KO) of Scn9a or Scn10a and the conditional KO (cKO) of Scn9a in specific cell populations were shown to decrease sensitivity to various pain stimuli. The Possum mutant mice bearing a dominant hypermorphic mutation in Scn10a revealed higher sensitivity to noxious stimuli. Several gain-of-function mutations were identified in patients with painful small fiber neuropathy. Future knowledge obtained from preclinical models bearing these mutations will allow understanding how these mutations affect pain. In addition, the review gives perspectives for creating models that better mimic patients' pain symptoms in view to developing novel analgesic strategies.
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Affiliation(s)
- Yaping Xue
- Université de Strasbourg, CNRS, INSERM, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC) Translational Medicine and Neurogenetics Department, Illkirch, France
| | - Celeste Chidiac
- Université de Strasbourg, CNRS, INSERM, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC) Translational Medicine and Neurogenetics Department, Illkirch, France
| | - Yann Herault
- Université de Strasbourg, CNRS, INSERM, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC) Translational Medicine and Neurogenetics Department, Illkirch, France.
| | - Claire Gaveriaux-Ruff
- Université de Strasbourg, CNRS, INSERM, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC) Translational Medicine and Neurogenetics Department, Illkirch, France
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20
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Moreno AM, Alemán F, Catroli GF, Hunt M, Hu M, Dailamy A, Pla A, Woller SA, Palmer N, Parekh U, McDonald D, Roberts AJ, Goodwill V, Dryden I, Hevner RF, Delay L, Gonçalves Dos Santos G, Yaksh TL, Mali P. Long-lasting analgesia via targeted in situ repression of Na V1.7 in mice. Sci Transl Med 2021; 13:eaay9056. [PMID: 33692134 PMCID: PMC8830379 DOI: 10.1126/scitranslmed.aay9056] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Revised: 08/14/2020] [Accepted: 11/10/2020] [Indexed: 12/12/2022]
Abstract
Current treatments for chronic pain rely largely on opioids despite their substantial side effects and risk of addiction. Genetic studies have identified in humans key targets pivotal to nociceptive processing. In particular, a hereditary loss-of-function mutation in NaV1.7, a sodium channel protein associated with signaling in nociceptive sensory afferents, leads to insensitivity to pain without other neurodevelopmental alterations. However, the high sequence and structural similarity between NaV subtypes has frustrated efforts to develop selective inhibitors. Here, we investigated targeted epigenetic repression of NaV1.7 in primary afferents via epigenome engineering approaches based on clustered regularly interspaced short palindromic repeats (CRISPR)-dCas9 and zinc finger proteins at the spinal level as a potential treatment for chronic pain. Toward this end, we first optimized the efficiency of NaV1.7 repression in vitro in Neuro2A cells and then, by the lumbar intrathecal route, delivered both epigenome engineering platforms via adeno-associated viruses (AAVs) to assess their effects in three mouse models of pain: carrageenan-induced inflammatory pain, paclitaxel-induced neuropathic pain, and BzATP-induced pain. Our results show effective repression of NaV1.7 in lumbar dorsal root ganglia, reduced thermal hyperalgesia in the inflammatory state, decreased tactile allodynia in the neuropathic state, and no changes in normal motor function in mice. We anticipate that this long-lasting analgesia via targeted in vivo epigenetic repression of NaV1.7 methodology we dub pain LATER, might have therapeutic potential in management of persistent pain states.
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Affiliation(s)
- Ana M Moreno
- Department of Bioengineering, University of California San Diego, San Diego, CA 92093, USA
| | - Fernando Alemán
- Department of Bioengineering, University of California San Diego, San Diego, CA 92093, USA
| | - Glaucilene F Catroli
- Department of Anesthesiology, University of California San Diego, San Diego, CA 92093, USA
| | - Matthew Hunt
- Department of Anesthesiology, University of California San Diego, San Diego, CA 92093, USA
| | - Michael Hu
- Department of Bioengineering, University of California San Diego, San Diego, CA 92093, USA
| | - Amir Dailamy
- Department of Bioengineering, University of California San Diego, San Diego, CA 92093, USA
| | - Andrew Pla
- Department of Bioengineering, University of California San Diego, San Diego, CA 92093, USA
| | - Sarah A Woller
- Department of Anesthesiology, University of California San Diego, San Diego, CA 92093, USA
| | - Nathan Palmer
- Division of Biological Sciences, University of California San Diego , San Diego, CA 92093, USA
| | - Udit Parekh
- Department of Electrical Engineering, University of California San Diego , San Diego, CA 92093, USA
| | - Daniella McDonald
- Department of Bioengineering, University of California San Diego, San Diego, CA 92093, USA
- Biomedical Sciences Graduate Program, University of California San Diego, San Diego, San Diego, CA 92093, USA
| | - Amanda J Roberts
- Animal Models Core, Scripps Research Institute, La Jolla, CA 92037, USA
| | - Vanessa Goodwill
- Department of Neuropathology, University of California San Diego, San Diego, CA 92093, USA
| | - Ian Dryden
- Department of Neuropathology, University of California San Diego, San Diego, CA 92093, USA
| | - Robert F Hevner
- Department of Neuropathology, University of California San Diego, San Diego, CA 92093, USA
| | - Lauriane Delay
- Department of Anesthesiology, University of California San Diego, San Diego, CA 92093, USA
| | | | - Tony L Yaksh
- Department of Anesthesiology, University of California San Diego, San Diego, CA 92093, USA.
| | - Prashant Mali
- Department of Bioengineering, University of California San Diego, San Diego, CA 92093, USA.
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21
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Miao B, Yin Y, Mao G, Zhao B, Wu J, Shi H, Fei S. The implication of transient receptor potential canonical 6 in BDNF-induced mechanical allodynia in rat model of diabetic neuropathic pain. Life Sci 2021; 273:119308. [PMID: 33667520 DOI: 10.1016/j.lfs.2021.119308] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 02/18/2021] [Accepted: 02/21/2021] [Indexed: 02/01/2023]
Abstract
AIMS Brain-derived neurotrophic factor (BDNF) is vital in the pathogenesis of mechanical allodynia with a paucity of reports available regarding diabetic neuropathy pain (DNP). Herein we identified the involvement of BDNF in driving mechanical allodynia in DNP rats via the activation of transient receptor potential canonical 6 (TRPC6) channel. MATERIALS AND METHODS The DNP rat model was established via streptozotocin (STZ) injection, and allodynia was assessed by paw withdrawal mechanical threshold (PWMT) and paw withdrawal thermal latency (PWTL). The expression profiles of BDNF and TRPC6 in dorsal root ganglia (DRG) and spinal cord were illustrated by immunofluorescence and Western blotting. Intrathecal administration of K252a or TrkB-Fc was performed to inhibit BNDF/TrkB expression, and respective injection of GsMTX-4, BTP2 and TRPC6 antisense oligodeoxynucleotides (TRPC6-AS) was likewise conducted to inhibit TRPC6 expression in DNP rats. Calcium influx in DRG was monitored by calcium imaging. KEY FINDINGS The time-dependent increase of BDNF and TRPC6 expression in DRG and spinal cord was observed since the 7th post-STZ day, correlated with the development of mechanical allodynia in DNP rats. Intrathecal administration of K252a, TrkB-Fc, GsMTX-4 and BTP2 prevented mechanical allodynia in DNP rats. Pre-treatment of TRPC6-AS reversed the BDNF-induced pain-like responses in DNP rats rather than the naïve rats. In addition, the TRPC6-AS reversed BDNF-induced increase of calcium influx in DRG neurons in DNP rats. SIGNIFICANCE The intrathecal inhibition of TRPC6 alleviated the BDNF-induced mechanical allodynia in DNP rat model. This finding may validate the application of TRPC6 antagonists as interesting strategy for DNP management.
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Affiliation(s)
- Bei Miao
- Department of Gastroenterology, The Affiliated Hospital of Xuzhou Medical University, 99 West Huaihai Road, Xuzhou 221002, Jiangsu Province, China; Institute of Digestive Diseases, Xuzhou Medical University, 84 West Huaihai Road, Xuzhou 221002, Jiangsu Province, China
| | - Yue Yin
- Department of Anesthesiology, Xuzhou Central Hospital, 199 Jiefang South Road, Xuzhou 221009, Jiangsu Province, China
| | - Guangtong Mao
- Department of Pathology, Xinyi People's Hospital, 16 Renmin Road, Xinyi 221400, Jiangsu Province, China
| | - Benhuo Zhao
- Department of Gastroenterology, The Affiliated Hospital of Xuzhou Medical University, 99 West Huaihai Road, Xuzhou 221002, Jiangsu Province, China
| | - Jiaojiao Wu
- Department of Gastroenterology, The Affiliated Hospital of Xuzhou Medical University, 99 West Huaihai Road, Xuzhou 221002, Jiangsu Province, China
| | - Hengliang Shi
- Central Laboratory, The Affiliated Hospital of Xuzhou Medical University, 99 West Huaihai Road, Xuzhou 221002, Jiangsu Province, China.
| | - Sujuan Fei
- Department of Gastroenterology, The Affiliated Hospital of Xuzhou Medical University, 99 West Huaihai Road, Xuzhou 221002, Jiangsu Province, China; Institute of Digestive Diseases, Xuzhou Medical University, 84 West Huaihai Road, Xuzhou 221002, Jiangsu Province, China.
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22
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Liu BW, Zhang J, Hong YS, Li NB, Liu Y, Zhang M, Wu WY, Zheng H, Lampert A, Zhang XW. NGF-Induced Nav1.7 Upregulation Contributes to Chronic Post-surgical Pain by Activating SGK1-Dependent Nedd4-2 Phosphorylation. Mol Neurobiol 2021; 58:964-982. [PMID: 33063281 DOI: 10.1007/s12035-020-02156-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Accepted: 09/29/2020] [Indexed: 01/07/2023]
Abstract
At present, chronic post-surgical pain (CPSP) is difficult to prevent and cure clinically because of our lack of understanding of its mechanisms. Surgical injury induces the upregulation of voltage-gated sodium channel Nav1.7 in dorsal root ganglion (DRG) neurons, suggesting that Nav1.7 is involved in the development of CPSP. However, the mechanism leading to persistent dysregulation of Nav1.7 is largely unknown. Given that nerve growth factor (NGF) induces a long-term increase in the neuronal hyperexcitability after injury, we hypothesized that NGF might cause the long-term dysregulation of Nav1.7. In this study, we aimed to investigate whether Nav1.7 regulation by NGF is involved in CPSP and thus contributes to the specific mechanisms involved in the development of CPSP. Using conditional nociceptor-specific Nav1.7 knockout mice, we confirmed the involvement of Nav1.7 in NGF-induced pain and identified its role in the maintenance of pain behavior during long-term observations (up to 14 days). Using western blot analyses and immunostaining, we showed that NGF could trigger the upregulation of Nav1.7 expression and thus support the development of CPSP in rats. Using pharmacological approaches, we showed that the increase of Nav1.7 might be partly regulated by an NGF/TrkA-SGK1-Nedd4-2-mediated pathway. Furthermore, reversing the upregulation of Nav1.7 in DRG could alleviate spinal sensitization. Our results suggest that the maintained upregulation of Nav1.7 triggered by NGF contributes to the development of CPSP. Attenuating the dysregulation of Nav1.7 in peripheral nociceptors may be a strategy to prevent the transition from acute post-surgical pain to CPSP.
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MESH Headings
- Analgesics/pharmacology
- Animals
- Behavior, Animal/drug effects
- Benzamides/pharmacology
- Brain-Derived Neurotrophic Factor/metabolism
- Ganglia, Spinal/drug effects
- Ganglia, Spinal/metabolism
- Hydrazines/pharmacology
- Immediate-Early Proteins/antagonists & inhibitors
- Immediate-Early Proteins/metabolism
- Indoles/pharmacology
- Male
- Mice, Knockout
- Models, Biological
- NAV1.7 Voltage-Gated Sodium Channel/genetics
- NAV1.7 Voltage-Gated Sodium Channel/metabolism
- Nedd4 Ubiquitin Protein Ligases/metabolism
- Nerve Growth Factor/pharmacology
- Pain, Postoperative/genetics
- Pain, Postoperative/pathology
- Phosphorylation/drug effects
- Protein Serine-Threonine Kinases/antagonists & inhibitors
- Protein Serine-Threonine Kinases/metabolism
- Rats, Sprague-Dawley
- Receptor, trkA/antagonists & inhibitors
- Receptor, trkA/metabolism
- Spinal Cord/pathology
- Ubiquitination/drug effects
- Up-Regulation/drug effects
- Vesicular Glutamate Transport Protein 2/metabolism
- Mice
- Rats
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Affiliation(s)
- Bao-Wen Liu
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Jin Zhang
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Yi-Shun Hong
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Ning-Bo Li
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Yi Liu
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Mi Zhang
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Wen-Yao Wu
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Hua Zheng
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Angelika Lampert
- Institute of Physiology, Medical Faculty, RWTH Aachen University, Aachen, Germany
| | - Xian-Wei Zhang
- Department of Anesthesiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
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23
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Grubinska B, Chen L, Alsaloum M, Rampal N, Matson DJ, Yang C, Taborn K, Zhang M, Youngblood B, Liu D, Galbreath E, Allred S, Lepherd M, Ferrando R, Kornecook TJ, Lehto SG, Waxman SG, Moyer BD, Dib-Hajj S, Gingras J. Rat Na V1.7 loss-of-function genetic model: Deficient nociceptive and neuropathic pain behavior with retained olfactory function and intra-epidermal nerve fibers. Mol Pain 2020; 15:1744806919881846. [PMID: 31550995 PMCID: PMC6831982 DOI: 10.1177/1744806919881846] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Recapitulating human disease pathophysiology using genetic animal models is a
powerful approach to enable mechanistic understanding of genotype–phenotype
relationships for drug development. NaV1.7 is a sodium channel
expressed in the peripheral nervous system with strong human genetic validation
as a pain target. Efforts to identify novel analgesics that are nonaddictive
resulted in industry exploration of a class of sulfonamide compounds that bind
to the fourth voltage-sensor domain of NaV1.7. Due to sequence
differences in this region, sulfonamide blockers generally are potent on human
but not rat NaV1.7 channels. To test sulfonamide-based chemical
matter in rat models of pain, we generated a humanized NaV1.7 rat
expressing a chimeric NaV1.7 protein containing the
sulfonamide-binding site of the human gene sequence as a replacement for the
equivalent rat sequence. Unexpectedly, upon transcription, the human insert was
spliced out, resulting in a premature stop codon. Using a validated antibody,
NaV1.7 protein was confirmed to be lost in the brainstem, dorsal
root ganglia, sciatic nerve, and gastrointestinal tissue but not in nasal
turbinates or olfactory bulb in rats homozygous for the knock-in allele
(HOM-KI). HOM-KI rats exhibited normal intraepidermal nerve fiber density with
reduced tetrodotoxin-sensitive current density and action potential firing in
small diameter dorsal root ganglia neurons. HOM-KI rats did not exhibit
nociceptive pain responses in hot plate or capsaicin-induced flinching assays
and did not exhibit neuropathic pain responses following spinal nerve ligation.
Consistent with expression of chimeric NaV1.7 in olfactory tissue,
HOM-KI rats retained olfactory function. This new genetic model highlights the
necessity of NaV1.7 for pain behavior in rats and indicates that
sufficient inhibition of NaV1.7 in humans may reduce pain in
neuropathic conditions. Due to preserved olfactory function, this rat model
represents an alternative to global NaV1.7 knockout mice that require
time-intensive hand feeding during early postnatal development.
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Affiliation(s)
- B Grubinska
- Neuroscience Department, Amgen Research, Cambridge, MA, USA.,Voyager Therapeutics, Cambridge, MA, USA
| | - L Chen
- Department of Neurology, Yale University, New Haven, CT, USA.,Center for Neuroscience & Regeneration Research, Yale University, West Haven, CT, USA.,Center for Rehabilitation Research, VA Connecticut Healthcare System, West Haven, CT, USA
| | - M Alsaloum
- Department of Neurology, Yale University, New Haven, CT, USA.,Center for Neuroscience & Regeneration Research, Yale University, West Haven, CT, USA.,Center for Rehabilitation Research, VA Connecticut Healthcare System, West Haven, CT, USA.,Interdepartmental Neuroscience Program, Yale University School of Medicine, New Haven, CT, USA.,Yale Medical Scientist Training Program, Yale School of Medicine, New Haven, CT, USA
| | - N Rampal
- Neuroscience Department, Amgen Research, Thousand Oaks, CA, USA
| | - D J Matson
- Neuroscience Department, Amgen Research, Cambridge, MA, USA
| | - C Yang
- Neuroscience Department, Amgen Research, Cambridge, MA, USA
| | - K Taborn
- Neuroscience Department, Amgen Research, Cambridge, MA, USA.,Wave Life Sciences, Ltd, Cambridge, MA, USA
| | - M Zhang
- Neuroscience Department, Amgen Research, Thousand Oaks, CA, USA
| | - B Youngblood
- Neuroscience Department, Amgen Research, Thousand Oaks, CA, USA
| | - D Liu
- Neuroscience Department, Amgen Research, Thousand Oaks, CA, USA
| | - E Galbreath
- Comparative Biology and Safety Sciences, Amgen Research, Cambridge, MA, USA.,Takeda Pharmaceutical Company Ltd, Cambridge, MA, USA
| | - S Allred
- Comparative Biology and Safety Sciences, Amgen Research, South San Francisco, CA, USA.,Seattle Genetics, Bothell, WA, USA
| | - M Lepherd
- Comparative Biology and Safety Sciences, Amgen Research, South San Francisco, CA, USA.,Genentech, Inc. South San Francisco, CA, USA
| | - R Ferrando
- Comparative Biology and Safety Sciences, Amgen Research, South San Francisco, CA, USA.,AbbVie Stemcentrx, Inc., South San Francisco, CA, USA
| | - T J Kornecook
- Neuroscience Department, Amgen Research, Thousand Oaks, CA, USA.,Biogen Inc., Cambridge, MA, USA
| | - S G Lehto
- Neuroscience Department, Amgen Research, Thousand Oaks, CA, USA
| | - S G Waxman
- Department of Neurology, Yale University, New Haven, CT, USA.,Center for Neuroscience & Regeneration Research, Yale University, West Haven, CT, USA.,Center for Rehabilitation Research, VA Connecticut Healthcare System, West Haven, CT, USA
| | - B D Moyer
- Neuroscience Department, Amgen Research, Thousand Oaks, CA, USA
| | - S Dib-Hajj
- Department of Neurology, Yale University, New Haven, CT, USA.,Center for Neuroscience & Regeneration Research, Yale University, West Haven, CT, USA.,Center for Rehabilitation Research, VA Connecticut Healthcare System, West Haven, CT, USA
| | - J Gingras
- Neuroscience Department, Amgen Research, Cambridge, MA, USA.,Homology Medicine Inc., Bedford, MA, USA
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24
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Elkholy SE, Elaidy SM, El-Sherbeeny NA, Toraih EA, El-Gawly HW. Neuroprotective effects of ranolazine versus pioglitazone in experimental diabetic neuropathy: Targeting Nav1.7 channels and PPAR-γ. Life Sci 2020; 250:117557. [PMID: 32184124 DOI: 10.1016/j.lfs.2020.117557] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 02/22/2020] [Accepted: 03/13/2020] [Indexed: 12/11/2022]
Abstract
Diabetic neuropathy (DN) is a common complication of diabetes mellitus (DM). Pathophysiology of DN includes inflammation and changes in expression and function of voltage-gated sodium channels (Nav) in peripheral nerves; and central reduction of Peroxisome Proliferator Activated Receptor-Gamma (PPAR-γ) expression. AIM This study explored the effect of ranolazine (RN) versus pioglitazone (PIO) in DN induced in rats. The role of sciatic interleukin (IL)-1β, tumor necrosis factor-alpha (TNF)-α, Nav1.7, and spinal PPAR-γ expressions were determined. MATERIALS AND METHODS For induction of Type-2 DM, 40 high fat diet-fed rats were challenged by a single dose of intraperitoneal streptozotocin (30 mg/kg). One week later, oral PIO (10 mg/kg; once daily) or RN (20, 50 and 100 mg/kg; twice daily) were administered for six weeks. Weekly body weight and fasting blood sugar (FBS) were measured. Rats were tested for thermal hyperalgesia and mechanical allodynia. At the end of the experiment, sciatic nerves homogenates were examined for TNF-α and IL-1B levels, and Nav1.7 channel expression. Segments of spinal cords were investigated for the PPAR-γ gene expression. Evaluation of histopathology of sciatic nerves and spinal cords were done. KEY FINDINGS In diabetic rats, PIO and RN individually improved evoked-pain behaviors, reduced sciatic TNF-α and 1L-1B levels; downregulated expressional levels of Nav1.7 channels; and increased the spinal PPAR-γ gene expression. RN in the dose of 100 mg/kg/day showed the most advantageous effects. SIGNIFICANCE RN has neuroprotective effects in Type-2 diabetes-induced DN. Further studies of combined RN-PIO treatment are recommended, especially in diabetic patients with cardiovascular co-morbidity.
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Affiliation(s)
- Shereen E Elkholy
- Department of Clinical Pharmacology, Faculty of Medicine, Port-Said University, Port-Said, Egypt
| | - Samah M Elaidy
- Department of Clinical Pharmacology, Faculty of Medicine, Suez Canal University, Ismailia, Egypt
| | - Nagla A El-Sherbeeny
- Department of Clinical Pharmacology, Faculty of Medicine, Suez Canal University, Ismailia, Egypt.
| | - Eman A Toraih
- Department of Surgery, Tulane University, School of Medicine, New Orleans, LA, USA; Genetics Unit, Department of Histology and Cell Biology, Faculty of Medicine, Suez Canal University, Ismailia, Egypt; Center of Excellence of Molecular and Cellular Medicine, Suez Canal University, Ismailia, Egypt
| | - Hoda W El-Gawly
- Department of Clinical Pharmacology, Faculty of Medicine, Suez Canal University, Ismailia, Egypt
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25
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Patwa S, Benson CA, Dyer L, Olson K, Bangalore L, Hill M, Waxman SG, Tan AM. Spinal cord motor neuron plasticity accompanies second-degree burn injury and chronic pain. Physiol Rep 2019; 7:e14288. [PMID: 31858746 PMCID: PMC6923170 DOI: 10.14814/phy2.14288] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Burn injuries and associated complications present a major public health challenge. Many burn patients develop clinically intractable complications, including pain and other sensory disorders. Recent evidence has shown that dendritic spine neuropathology in spinal cord sensory and motor neurons accompanies central nervous system (CNS) or peripheral nervous system (PNS) trauma and disease. However, no research has investigated similar dendritic spine neuropathologies following a cutaneous thermal burn injury. In this retrospective investigation, we analyzed dendritic spine morphology and localization in alpha-motor neurons innervating a burn-injured area of the body (hind paw). To identify a molecular regulator of these dendritic spine changes, we further profiled motor neuron dendritic spines in adult mice treated with romidepsin, a clinically approved Pak1-inhibitor, or vehicle control at two postburn time points: Day 6 immediately after treatment, or Day 10 following drug withdrawal. In control treated mice, we observed an overall increase in dendritic spine density, including structurally mature spines with mushroom-shaped morphology. Pak1-inhibitor treatment reduced injury-induced changes to similar levels observed in animals without burn injury. The effectiveness of the Pak1-inhibitor was durable, since normalized dendritic spine profiles remained as long as 4 days despite drug withdrawal. This study is the first report of evidence demonstrating that a second-degree burn injury significantly affects motor neuron structure within the spinal cord. Furthermore, our results support the opportunity to study dendritic spine dysgenesis as a novel avenue to clarify the complexities of neurological disease following traumatic injury.
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Affiliation(s)
- Siraj Patwa
- Department of Neurology and Center for Neuroscience and Regeneration ResearchYale University School of MedicineNew HavenConnecticut
- Rehabilitation Research CenterVeterans Affairs Connecticut Healthcare SystemWest HavenConnecticut
| | - Curtis A. Benson
- Department of Neurology and Center for Neuroscience and Regeneration ResearchYale University School of MedicineNew HavenConnecticut
- Rehabilitation Research CenterVeterans Affairs Connecticut Healthcare SystemWest HavenConnecticut
| | - Lauren Dyer
- Department of Neurology and Center for Neuroscience and Regeneration ResearchYale University School of MedicineNew HavenConnecticut
- Rehabilitation Research CenterVeterans Affairs Connecticut Healthcare SystemWest HavenConnecticut
| | - Kai‐Lan Olson
- Department of Neurology and Center for Neuroscience and Regeneration ResearchYale University School of MedicineNew HavenConnecticut
- Rehabilitation Research CenterVeterans Affairs Connecticut Healthcare SystemWest HavenConnecticut
| | - Lakshmi Bangalore
- Department of Neurology and Center for Neuroscience and Regeneration ResearchYale University School of MedicineNew HavenConnecticut
- Rehabilitation Research CenterVeterans Affairs Connecticut Healthcare SystemWest HavenConnecticut
| | - Myriam Hill
- Department of Neurology and Center for Neuroscience and Regeneration ResearchYale University School of MedicineNew HavenConnecticut
- Rehabilitation Research CenterVeterans Affairs Connecticut Healthcare SystemWest HavenConnecticut
| | - Stephen G. Waxman
- Department of Neurology and Center for Neuroscience and Regeneration ResearchYale University School of MedicineNew HavenConnecticut
- Rehabilitation Research CenterVeterans Affairs Connecticut Healthcare SystemWest HavenConnecticut
| | - Andrew M. Tan
- Department of Neurology and Center for Neuroscience and Regeneration ResearchYale University School of MedicineNew HavenConnecticut
- Rehabilitation Research CenterVeterans Affairs Connecticut Healthcare SystemWest HavenConnecticut
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26
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Lee S, Jo S, Talbot S, Zhang HXB, Kotoda M, Andrews NA, Puopolo M, Liu PW, Jacquemont T, Pascal M, Heckman LM, Jain A, Lee J, Woolf CJ, Bean BP. Novel charged sodium and calcium channel inhibitor active against neurogenic inflammation. eLife 2019; 8:48118. [PMID: 31765298 PMCID: PMC6877086 DOI: 10.7554/elife.48118] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Accepted: 11/13/2019] [Indexed: 12/12/2022] Open
Abstract
Voltage-dependent sodium and calcium channels in pain-initiating nociceptor neurons are attractive targets for new analgesics. We made a permanently charged cationic derivative of an N-type calcium channel-inhibitor. Unlike cationic derivatives of local anesthetic sodium channel blockers like QX-314, this cationic compound inhibited N-type calcium channels more effectively with extracellular than intracellular application. Surprisingly, the compound is also a highly effective sodium channel inhibitor when applied extracellularly, producing more potent inhibition than lidocaine or bupivacaine. The charged inhibitor produced potent and long-lasting analgesia in mouse models of incisional wound and inflammatory pain, inhibited release of the neuropeptide calcitonin gene-related peptide (CGRP) from dorsal root ganglion neurons, and reduced inflammation in a mouse model of allergic asthma, which has a strong neurogenic component. The results show that some cationic molecules applied extracellularly can powerfully inhibit both sodium channels and calcium channels, thereby blocking both nociceptor excitability and pro-inflammatory peptide release.
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Affiliation(s)
- Seungkyu Lee
- FM Kirby Neurobiology Research Center, Boston Children's Hospital, Boston, United States
| | - Sooyeon Jo
- Department of Neurobiology, Harvard Medical School, Boston, United States
| | - Sébastien Talbot
- Département de Pharmacologie et Physiologie, Université de Montréal, Montréal, Canada
| | | | - Masakazu Kotoda
- FM Kirby Neurobiology Research Center, Boston Children's Hospital, Boston, United States
| | - Nick A Andrews
- FM Kirby Neurobiology Research Center, Boston Children's Hospital, Boston, United States
| | - Michelino Puopolo
- Department of Anesthesiology, Renaissance School of Medicine at Stony Brook University, Stony Brook, United States
| | - Pin W Liu
- Department of Neurobiology, Harvard Medical School, Boston, United States
| | - Thomas Jacquemont
- FM Kirby Neurobiology Research Center, Boston Children's Hospital, Boston, United States
| | - Maud Pascal
- FM Kirby Neurobiology Research Center, Boston Children's Hospital, Boston, United States
| | - Laurel M Heckman
- FM Kirby Neurobiology Research Center, Boston Children's Hospital, Boston, United States
| | - Aakanksha Jain
- FM Kirby Neurobiology Research Center, Boston Children's Hospital, Boston, United States
| | - Jinbo Lee
- Sage Partner International, Andover, United States
| | - Clifford J Woolf
- FM Kirby Neurobiology Research Center, Boston Children's Hospital, Boston, United States.,Department of Neurobiology, Harvard Medical School, Boston, United States
| | - Bruce P Bean
- Department of Neurobiology, Harvard Medical School, Boston, United States
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27
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Akin EJ, Higerd GP, Mis MA, Tanaka BS, Adi T, Liu S, Dib-Hajj FB, Waxman SG, Dib-Hajj SD. Building sensory axons: Delivery and distribution of Na V1.7 channels and effects of inflammatory mediators. SCIENCE ADVANCES 2019; 5:eaax4755. [PMID: 31681845 PMCID: PMC6810356 DOI: 10.1126/sciadv.aax4755] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Accepted: 09/13/2019] [Indexed: 05/12/2023]
Abstract
Sodium channel NaV1.7 controls firing of nociceptors, and its role in human pain has been validated by genetic and functional studies. However, little is known about NaV1.7 trafficking or membrane distribution along sensory axons, which can be a meter or more in length. We show here with single-molecule resolution the first live visualization of NaV1.7 channels in dorsal root ganglia neurons, including long-distance microtubule-dependent vesicular transport in Rab6A-containing vesicles. We demonstrate nanoclusters that contain a median of 12.5 channels at the plasma membrane on axon termini. We also demonstrate that inflammatory mediators trigger an increase in the number of NaV1.7-carrying vesicles per axon, a threefold increase in the median number of NaV1.7 channels per vesicle and a ~50% increase in forward velocity. This remarkable enhancement of NaV1.7 vesicular trafficking and surface delivery under conditions that mimic a disease state provides new insights into the contribution of NaV1.7 to inflammatory pain.
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Affiliation(s)
- Elizabeth J. Akin
- Department of Neurology, Yale University, New Haven, CT 06510, USA
- Center for Neuroscience and Regeneration Research, Yale University, New Haven, CT 06510, USA
- Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, CT 06516, USA
| | - Grant P. Higerd
- Department of Neurology, Yale University, New Haven, CT 06510, USA
- Center for Neuroscience and Regeneration Research, Yale University, New Haven, CT 06510, USA
- Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, CT 06516, USA
- MD-PhD Program, Yale University School of Medicine, New Haven, CT 06510, USA
| | - Malgorzata A. Mis
- Department of Neurology, Yale University, New Haven, CT 06510, USA
- Center for Neuroscience and Regeneration Research, Yale University, New Haven, CT 06510, USA
- Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, CT 06516, USA
| | - Brian S. Tanaka
- Department of Neurology, Yale University, New Haven, CT 06510, USA
- Center for Neuroscience and Regeneration Research, Yale University, New Haven, CT 06510, USA
- Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, CT 06516, USA
| | - Talia Adi
- Department of Neurology, Yale University, New Haven, CT 06510, USA
- Center for Neuroscience and Regeneration Research, Yale University, New Haven, CT 06510, USA
- Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, CT 06516, USA
| | - Shujun Liu
- Department of Neurology, Yale University, New Haven, CT 06510, USA
- Center for Neuroscience and Regeneration Research, Yale University, New Haven, CT 06510, USA
- Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, CT 06516, USA
| | - Fadia B. Dib-Hajj
- Department of Neurology, Yale University, New Haven, CT 06510, USA
- Center for Neuroscience and Regeneration Research, Yale University, New Haven, CT 06510, USA
- Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, CT 06516, USA
| | - Stephen G. Waxman
- Department of Neurology, Yale University, New Haven, CT 06510, USA
- Center for Neuroscience and Regeneration Research, Yale University, New Haven, CT 06510, USA
- Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, CT 06516, USA
- Corresponding author. (S.D.D.-H.); (S.G.W.)
| | - Sulayman D. Dib-Hajj
- Department of Neurology, Yale University, New Haven, CT 06510, USA
- Center for Neuroscience and Regeneration Research, Yale University, New Haven, CT 06510, USA
- Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, CT 06516, USA
- Corresponding author. (S.D.D.-H.); (S.G.W.)
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28
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Xie MX, Zhang XL, Xu J, Zeng WA, Li D, Xu T, Pang RP, Ma K, Liu XG. Nuclear Factor-kappaB Gates Na v1.7 Channels in DRG Neurons via Protein-Protein Interaction. iScience 2019; 19:623-633. [PMID: 31446225 PMCID: PMC6715905 DOI: 10.1016/j.isci.2019.08.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 07/04/2019] [Accepted: 08/06/2019] [Indexed: 12/19/2022] Open
Abstract
It is well known that nuclear factor-kappaB (NF-κB) regulates neuronal structures and functions by nuclear transcription. Here, we showed that phospho-p65 (p-p65), an active form of NF-κB subunit, reversibly interacted with Nav1.7 channels in the membrane of dorsal root ganglion (DRG) neurons of rats. The interaction increased Nav1.7 currents by slowing inactivation of Nav1.7 channels and facilitating their recovery from inactivation, which may increase the resting state of the channels ready for activation. In cultured DRG neurons TNF-α upregulated the membrane p-p65 and enhanced Nav1.7 currents within 5 min but did not affect nuclear NF-κB within 40 min. This non-transcriptional effect on Nav1.7 may underlie a rapid regulation of the sensibility of the somatosensory system. Both NF-κB and Nav1.7 channels are critically implicated in many physiological functions and diseases. Our finding may shed new light on the investigation into the underlying mechanisms. NF-κB p-p65 interacts with Nav1.7 in the membrane of DRG neurons The interaction is reversible, depending on the cytoplasmic p-p65 content Reducing cytoplasmic p-p65 rapidly attenuates the interaction and Nav1.7 currents The rapid effect on Nav1.7 channels is independent of p-p65 nuclear translocation
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Affiliation(s)
- Man-Xiu Xie
- Department of Anesthesiology, Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, 651 Dongfeng East Road, Guangzhou 510060, China
| | - Xiao-Long Zhang
- Medical Research Center of Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, 106 Zhongshan Road 2, Guangzhou 510080, China
| | - Jing Xu
- Pain Research Center and Department of Physiology, Zhongshan School of Medicine of Sun Yat-sen University, 74 Zhongshan Road 2, Guangzhou 510080, China
| | - Wei-An Zeng
- Department of Anesthesiology, Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, 651 Dongfeng East Road, Guangzhou 510060, China
| | - Dai Li
- Pain Research Center and Department of Physiology, Zhongshan School of Medicine of Sun Yat-sen University, 74 Zhongshan Road 2, Guangzhou 510080, China
| | - Ting Xu
- Pain Research Center and Department of Physiology, Zhongshan School of Medicine of Sun Yat-sen University, 74 Zhongshan Road 2, Guangzhou 510080, China
| | - Rui-Ping Pang
- Pain Research Center and Department of Physiology, Zhongshan School of Medicine of Sun Yat-sen University, 74 Zhongshan Road 2, Guangzhou 510080, China
| | - Ke Ma
- Department of Pain Management, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 91603, China.
| | - Xian-Guo Liu
- Pain Research Center and Department of Physiology, Zhongshan School of Medicine of Sun Yat-sen University, 74 Zhongshan Road 2, Guangzhou 510080, China; Department of Pain Management, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 91603, China; Guangdong Provincial Key Laboratory of Brain Function and Disease, 74 Zhongshan Road 2, Guangzhou 510080, China.
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Effraim PR, Huang J, Lampert A, Stamboulian S, Zhao P, Black JA, Dib-Hajj SD, Waxman SG. Fibroblast growth factor homologous factor 2 (FGF-13) associates with Nav1.7 in DRG neurons and alters its current properties in an isoform-dependent manner. NEUROBIOLOGY OF PAIN (CAMBRIDGE, MASS.) 2019; 6:100029. [PMID: 31223136 PMCID: PMC6565799 DOI: 10.1016/j.ynpai.2019.100029] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 03/22/2019] [Accepted: 03/22/2019] [Indexed: 11/29/2022]
Abstract
Fibroblast Growth Factor Homologous Factors (FHF) constitute a subfamily of FGF proteins with four prototypes (FHF1-4; also known as FGF11-14). FHF proteins have been shown to bind directly to the membrane-proximal segment of the C-terminus in voltage-gated sodium channels (Nav), and regulate current density, availability, and frequency-dependent inhibition of sodium currents. Members of the FHF2 subfamily, FHF2A and FHF2B, differ in the length and sequence of their N-termini, and, importantly, differentially regulate Nav1.6 gating properties. Using immunohistochemistry, we show that FHF2 isoforms are expressed in adult dorsal root ganglion (DRG) neurons where they co-localize with Nav1.6 and Nav1.7. FHF2A and FHF2B show differential localization in neuronal compartments in DRG neurons, and levels of expression of FHF2 factors are down-regulated following sciatic nerve axotomy. Because Nav1.7 in nociceptors plays a critical role in pain, we reasoned that its interaction with FHF2 isoforms might regulate its current properties. Using whole-cell patch clamp in heterologous expression systems, we show that the expression of FHF2A in HEK293 cell line stably expressing Nav1.7 channels causes no change in activation, whereas FHF2B depolarizes activation. Both FHF2 isoforms depolarize fast-inactivation. Additionally, FHF2A causes an accumulation of inactivated channels at all frequencies tested due to a slowing of recovery from inactivation, whereas FHF2B has little effect on these properties of Nav1.7. Measurements of the Nav1.7 current in DRG neurons in which FHF2 levels are knocked down confirmed the effects of FHF2A on repriming, and FHF2B on activation, however FHF2A and B did not have an effect on fast inactivation. Our data demonstrates that FHF2 does indeed regulate the current properties of Nav1.7 and does so in an isoform and cell-specific manner.
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Affiliation(s)
- Philip R. Effraim
- Department of Anesthesiology, Yale University School of Medicine, New Haven, CT 06510, USA
- Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, CT 06510, USA
- Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, CT 06516, USA
| | - Jianying Huang
- Department of Neurology, Yale University School of Medicine, New Haven, CT 06510, USA
- Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, CT 06510, USA
- Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, CT 06516, USA
| | - Angelika Lampert
- Institute of Physiology, Uniklinik RWTH Aachen University, Aachen, Germany
| | - Severine Stamboulian
- Department of Neurology, Yale University School of Medicine, New Haven, CT 06510, USA
- Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, CT 06510, USA
- Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, CT 06516, USA
| | - Peng Zhao
- Department of Neurology, Yale University School of Medicine, New Haven, CT 06510, USA
- Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, CT 06510, USA
- Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, CT 06516, USA
| | - Joel A. Black
- Department of Neurology, Yale University School of Medicine, New Haven, CT 06510, USA
- Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, CT 06510, USA
- Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, CT 06516, USA
| | - Sulayman D. Dib-Hajj
- Department of Neurology, Yale University School of Medicine, New Haven, CT 06510, USA
- Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, CT 06510, USA
- Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, CT 06516, USA
| | - Stephen G. Waxman
- Department of Neurology, Yale University School of Medicine, New Haven, CT 06510, USA
- Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, CT 06510, USA
- Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, CT 06516, USA
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Bisphenol A Regulates Sodium Ramp Currents in Mouse Dorsal Root Ganglion Neurons and Increases Nociception. Sci Rep 2019; 9:10306. [PMID: 31312012 PMCID: PMC6635372 DOI: 10.1038/s41598-019-46769-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Accepted: 07/05/2019] [Indexed: 12/02/2022] Open
Abstract
17β-Estradiol mediates the sensitivity to pain and is involved in sex differences in nociception. The widespread environmental disrupting chemical bisphenol A (BPA) has estrogenic activity, but its implications in pain are mostly unknown. Here we show that treatment of male mice with BPA (50 µg/kg/day) during 8 days, decreases the latency to pain behavior in response to heat, suggesting increased pain sensitivity. We demonstrate that incubation of dissociated dorsal root ganglia (DRG) nociceptors with 1 nM BPA increases the frequency of action potential firing. SCN9A encodes the voltage-gated sodium channel Nav1.7, which is present in DRG nociceptors and is essential in pain signaling. Nav1.7 and other voltage-gated sodium channels in mouse DRG are considered threshold channels because they produce ramp currents, amplifying small depolarizations and enhancing electrical activity. BPA increased Nav-mediated ramp currents elicited with slow depolarizations. Experiments using pharmacological tools as well as DRG from ERβ−/− mice indicate that this BPA effect involves ERα and phosphoinositide 3-kinase. The mRNA expression and biophysical properties other than ramp currents of Nav channels, were unchanged by BPA. Our data suggest that BPA at environmentally relevant doses affects the ability to detect noxious stimuli and therefore should be considered when studying the etiology of pain conditions.
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Li M, Zhang SJ, Yang L, Fang XL, Hu HF, Zhao MY, Li L, Guo YY, Shao JP. Voltage-gated sodium channel 1.7 expression decreases in dorsal root ganglia in a spinal nerve ligation neuropathic pain model. Kaohsiung J Med Sci 2019; 35:493-500. [PMID: 31087766 DOI: 10.1002/kjm2.12088] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Accepted: 04/30/2019] [Indexed: 02/06/2023] Open
Abstract
The role of the voltage-gated sodium channel 1.7 (Nav1.7) is unclear in models of neuropathic pain induced by nerve injury. In the present study, we measured expression levels of Nav1.7 in two distinct neuropathic pain models: spinal nerve ligation (SNL) and chronic constriction injury (CCI). In the SNL model, both mRNA and protein levels of Nav1.7 were markedly lower in the L5 dorsal root ganglia (DRG) but were significantly higher in the L4 DRG. Nav1.7 protein levels were notably higher in both L4 and L5 DRGs under CCI conditions. We found that excessive damage of L5 nerves such as SNL reduced expression levels of Nav1.7 in the injured L5 DRG and activated the adjacent uninjured DRG, resulting in Nav1.7 level increases in the adjacent L4 DRG. We confirmed again that Nav1.7 was closely related to neuropathic pain induced by nerve injury. More importantly, our results suggest that tracing the molecular changes exclusively in the L5 DRG in SNL model may not completely explain the pain mechanism; it is necessary to study the adjacent uninjured L4 DRG.
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Affiliation(s)
- Ming Li
- Department of Human Anatomy, School of Basic Medicine, Zhengzhou University, Zhengzhou, China
| | - Shao-Jin Zhang
- School of Basic Medicine, Zhengzhou University, Zhengzhou, China
| | - Lin Yang
- School of Basic Medicine, Zhengzhou University, Zhengzhou, China
| | - Xiao-Lei Fang
- School of Basic Medicine, Zhengzhou University, Zhengzhou, China
| | - Hao-Fan Hu
- School of Basic Medicine, Zhengzhou University, Zhengzhou, China
| | - Ming-Yue Zhao
- School of Basic Medicine, Zhengzhou University, Zhengzhou, China
| | - Lei Li
- Department of Human Anatomy, School of Basic Medicine, Zhengzhou University, Zhengzhou, China
| | - Yan-Yan Guo
- Department of Human Anatomy, School of Basic Medicine, Zhengzhou University, Zhengzhou, China
| | - Jin-Ping Shao
- Department of Human Anatomy, School of Basic Medicine, Zhengzhou University, Zhengzhou, China
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Eidson LN, Murphy AZ. Inflammatory mediators of opioid tolerance: Implications for dependency and addiction. Peptides 2019; 115:51-58. [PMID: 30890355 PMCID: PMC6863079 DOI: 10.1016/j.peptides.2019.01.003] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Revised: 01/24/2019] [Accepted: 01/30/2019] [Indexed: 12/27/2022]
Abstract
Each year, over 50 million Americans suffer from persistent pain, including debilitating headaches, joint pain, and severe back pain. Although morphine is amongst the most effective analgesics available for the management of severe pain, prolonged morphine treatment results in decreased analgesic efficacy (i.e., tolerance). Despite significant headway in the field, the mechanisms underlying the development of morphine tolerance are not well understood. The midbrain ventrolateral periaqueductal gray (vlPAG) is a primary neural substrate for the analgesic effects of morphine, as well as for the development of morphine tolerance. A growing body of literature indicates that activated glia (i.e., microglia and astrocytes) facilitate pain transmission and oppose morphine analgesia, making these cells important potential targets in the treatment of chronic pain. Morphine affects glia by binding to the innate immune receptor toll-like receptor 4 (TLR4), leading to the release of proinflammatory cytokines and opposition of morphine analgesia. Despite the established role of the vlPAG as an integral locus for the development of morphine tolerance, most studies have examined the role of glia activation within the spinal cord. Additionally, the role of TLR4 in the development of tolerance has not been elucidated. This review attempts to summarize what is known regarding the role of vlPAG glia and TLR4 in the development of morphine tolerance. These data, together, provide information about the mechanism by which central nervous system glia regulate morphine tolerance, and identify a potential therapeutic target for the enhancement of analgesic efficacy in the clinical treatment of chronic pain.
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Affiliation(s)
- Lori N Eidson
- Department of Physiology, Emory University, Atlanta, GA, 30322, United States
| | - Anne Z Murphy
- Neuroscience Institute, Georgia State University, Atlanta, GA, 30308, United States.
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Bennett DL, Clark AJ, Huang J, Waxman SG, Dib-Hajj SD. The Role of Voltage-Gated Sodium Channels in Pain Signaling. Physiol Rev 2019; 99:1079-1151. [DOI: 10.1152/physrev.00052.2017] [Citation(s) in RCA: 256] [Impact Index Per Article: 51.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Acute pain signaling has a key protective role and is highly evolutionarily conserved. Chronic pain, however, is maladaptive, occurring as a consequence of injury and disease, and is associated with sensitization of the somatosensory nervous system. Primary sensory neurons are involved in both of these processes, and the recent advances in understanding sensory transduction and human genetics are the focus of this review. Voltage-gated sodium channels (VGSCs) are important determinants of sensory neuron excitability: they are essential for the initial transduction of sensory stimuli, the electrogenesis of the action potential, and neurotransmitter release from sensory neuron terminals. Nav1.1, Nav1.6, Nav1.7, Nav1.8, and Nav1.9 are all expressed by adult sensory neurons. The biophysical characteristics of these channels, as well as their unique expression patterns within subtypes of sensory neurons, define their functional role in pain signaling. Changes in the expression of VGSCs, as well as posttranslational modifications, contribute to the sensitization of sensory neurons in chronic pain states. Furthermore, gene variants in Nav1.7, Nav1.8, and Nav1.9 have now been linked to human Mendelian pain disorders and more recently to common pain disorders such as small-fiber neuropathy. Chronic pain affects one in five of the general population. Given the poor efficacy of current analgesics, the selective expression of particular VGSCs in sensory neurons makes these attractive targets for drug discovery. The increasing availability of gene sequencing, combined with structural modeling and electrophysiological analysis of gene variants, also provides the opportunity to better target existing therapies in a personalized manner.
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Affiliation(s)
- David L. Bennett
- Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom; Department of Neurology and Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, Connecticut; and Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, Connecticut
| | - Alex J. Clark
- Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom; Department of Neurology and Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, Connecticut; and Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, Connecticut
| | - Jianying Huang
- Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom; Department of Neurology and Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, Connecticut; and Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, Connecticut
| | - Stephen G. Waxman
- Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom; Department of Neurology and Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, Connecticut; and Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, Connecticut
| | - Sulayman D. Dib-Hajj
- Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom; Department of Neurology and Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, Connecticut; and Rehabilitation Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, Connecticut
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Morgan M, Deuis JR, Frøsig-Jørgensen M, Lewis RJ, Cabot PJ, Gray PD, Vetter I. Burn Pain: A Systematic and Critical Review of Epidemiology, Pathophysiology, and Treatment. PAIN MEDICINE 2019; 19:708-734. [PMID: 29036469 DOI: 10.1093/pm/pnx228] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Objective This review aims to examine the available literature on the epidemiology, pathophysiology, and treatment of burn-induced pain. Methods A search was conducted on the epidemiology of burn injury and treatment of burn pain utilizing the database Medline, and all relevant articles were systemically reviewed. In addition, a critical review was performed on the pathophysiology of burn pain and animal models of burn pain. Results The search on the epidemiology of burn injury yielded a total of 163 publications of interest, 72 of which fit the inclusion/exclusion criteria, with no publications providing epidemiological data on burn injury pain management outcomes. The search on the treatment of burn pain yielded a total of 213 publications, 14 of which fit the inclusion/exclusion criteria, highlighting the limited amount of evidence available on the treatment of burn-induced pain. Conclusions The pathophysiology of burn pain is poorly understood, with limited clinical trials available to assess the effectiveness of analgesics in burn patients. Further studies are needed to identify new pharmacological targets and treatments for the effective management of burn injury pain.
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Affiliation(s)
- Michael Morgan
- Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, St Lucia, Queensland, Australia
| | - Jennifer R Deuis
- Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, St Lucia, Queensland, Australia
| | - Majbrit Frøsig-Jørgensen
- Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, St Lucia, Queensland, Australia
| | - Richard J Lewis
- Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, St Lucia, Queensland, Australia
| | - Peter J Cabot
- School of Pharmacy, The University of Queensland, Wooloongabba, Queensland, Australia
| | - Paul D Gray
- Tess Cramond Multidisciplinary Pain Centre, Royal Brisbane & Women's Hospital, Metro North Health, Herston, Queensland, Australia.,School of Medicine, The University of Queensland, Herston, Queensland, Australia
| | - Irina Vetter
- Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, St Lucia, Queensland, Australia.,School of Pharmacy, The University of Queensland, Wooloongabba, Queensland, Australia
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MicroRNA-182 Alleviates Neuropathic Pain by Regulating Nav1.7 Following Spared Nerve Injury in Rats. Sci Rep 2018; 8:16750. [PMID: 30425258 PMCID: PMC6233159 DOI: 10.1038/s41598-018-34755-3] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Accepted: 10/24/2018] [Indexed: 02/08/2023] Open
Abstract
The sodium channel 1.7 (Nav1.7), which is encoded by SCN9A gene, is involved in neuropathic pain. As crucial regulators of gene expression, many miRNAs have already gained importance in neuropathic pain, including miR-182, which is predicted to regulate the SCN9A gene. Nav1.7 expression in L4-L6 dorsal root ganglions (DRGs) can be up regulated by spared nerve injury (SNI), while miR-182 expression was down regulated following SNI model. Exploring the connection between Nav1.7 and miR-182 may facilitate the development of a better-targeted therapy. In the current study, direct pairing of miR-182 with the SCN9A gene was verified using a luciferase assay in vitro. Over-expression of miR-182 via microinjection of miR-182 agomir reversed the abnormal increase of Nav1.7 at both mRNA and protein level in L4-6 DRGs of SNI rats, and significantly attenuated the hypersensitivity to mechanical stimulus in the rats. In contrast, administration of miR-182 antagomir enhanced the Nav1.7 expression at both mRNA and protein level in L4-6 DRGs, companied with the generation of mechanical hypersensitivity in naïve rats. Collectively, we concluded that miR-182 can alleviate SNI- induced neuropathic pain through regulating Nav1.7 in rats.
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Palanivelu V, Maghami S, Wallace HJ, Wijeratne D, Wood FM, Fear MW. Loss of Type A neuronal cells in the dorsal root ganglion after a non-severe full-thickness burn injury in a rodent model. Burns 2018; 44:1792-1800. [DOI: 10.1016/j.burns.2018.04.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Revised: 03/27/2018] [Accepted: 04/05/2018] [Indexed: 01/06/2023]
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Na V 1.7 as a Pharmacogenomic Target for Pain: Moving Toward Precision Medicine. Trends Pharmacol Sci 2018; 39:258-275. [DOI: 10.1016/j.tips.2017.11.010] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Revised: 11/27/2017] [Accepted: 11/29/2017] [Indexed: 01/15/2023]
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Adi T, Estacion M, Schulman BR, Vernino S, Dib-Hajj SD, Waxman SG. A novel gain-of-function Na v1.7 mutation in a carbamazepine-responsive patient with adult-onset painful peripheral neuropathy. Mol Pain 2018; 14:1744806918815007. [PMID: 30392441 PMCID: PMC6856981 DOI: 10.1177/1744806918815007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Accepted: 10/12/2018] [Indexed: 12/13/2022] Open
Abstract
Voltage-gated sodium channel Nav1.7 is a threshold channel in peripheral dorsal root ganglion (DRG), trigeminal ganglion, and sympathetic ganglion neurons. Gain-of-function mutations in Nav1.7 have been shown to increase excitability in DRG neurons and have been linked to rare Mendelian and more common pain disorders. Discovery of Nav1.7 variants in patients with pain disorders may expand the spectrum of painful peripheral neuropathies associated with a well-defined molecular target, thereby providing a basis for more targeted approaches for treatment. We screened the genome of a patient with adult-onset painful peripheral neuropathy characterized by severe burning pain and report here the new Nav1.7-V810M variant. Voltage-clamp recordings were used to assess the effects of the mutation on biophysical properties of Nav1.7 and the response of the mutant channel to treatment with carbamazepine (CBZ), and multi-electrode array (MEA) recordings were used to assess the effects of the mutation on the excitability of neonatal rat pup DRG neurons. The V810M variant increases current density, shifts activation in a hyperpolarizing direction, and slows kinetics of deactivation, all gain-of-function attributes. We also show that DRG neurons that express the V810M variant become hyperexcitable. The patient responded to treatment with CBZ. Although CBZ did not depolarize activation of the mutant channel, it enhanced use-dependent inhibition. Our results demonstrate the presence of a novel gain-of-function variant of Nav1.7 in a patient with adult-onset painful peripheral neuropathy and the responsiveness of that patient to treatment with CBZ, which is likely due to the classical mechanism of use-dependent inhibition.
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Affiliation(s)
- Talia Adi
- Department of Neurology, Yale University School of Medicine, New
Haven, CT, USA
- Center for Neuroscience and Regeneration Research, Veterans
Affairs Medical Center, West Haven, CT, USA
| | - Mark Estacion
- Department of Neurology, Yale University School of Medicine, New
Haven, CT, USA
- Center for Neuroscience and Regeneration Research, Veterans
Affairs Medical Center, West Haven, CT, USA
| | - Betsy R Schulman
- Department of Neurology, Yale University School of Medicine, New
Haven, CT, USA
- Center for Neuroscience and Regeneration Research, Veterans
Affairs Medical Center, West Haven, CT, USA
| | - Steven Vernino
- Department of Neurology and Neurotherapeutics, UT Southwestern
Medical Center, Dallas, TX, USA
| | - Sulayman D Dib-Hajj
- Department of Neurology, Yale University School of Medicine, New
Haven, CT, USA
- Center for Neuroscience and Regeneration Research, Veterans
Affairs Medical Center, West Haven, CT, USA
| | - Stephen G Waxman
- Department of Neurology, Yale University School of Medicine, New
Haven, CT, USA
- Center for Neuroscience and Regeneration Research, Veterans
Affairs Medical Center, West Haven, CT, USA
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Burn injury: Challenges and advances in burn wound healing, infection, pain and scarring. Adv Drug Deliv Rev 2018; 123:3-17. [PMID: 28941987 DOI: 10.1016/j.addr.2017.09.018] [Citation(s) in RCA: 304] [Impact Index Per Article: 50.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Revised: 09/15/2017] [Accepted: 09/18/2017] [Indexed: 12/18/2022]
Abstract
Severe burn injuries are the most traumatic and physically debilitating injuries affecting nearly every organ system and leading to significant morbidity and mortality. Early burn wound excision and skin grafting are common clinical practices that have significantly improved the outcomes for severe burn injured patients by reducing mortality rate and days of hospital stay. However, slow wound healing, infection, pain, and hypertrophic scarring continue to remain a major challenge in burn research and management. In the present article, we review and discuss issues in the current treatment of burn injuries; the advances and novel strategies developed in the past decade that have improved burn management; and also, pioneer ideas and studies in burn research which aims to enhance burn wound care with a focus on burn wound infection, pain management, treatments for scarring and skin tissue engineering.
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40
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Guo Y, Benson C, Hill M, Henry S, Effraim P, Waxman SG, Dib-Hajj S, Tan AM. Therapeutic potential of Pak1 inhibition for pain associated with cutaneous burn injury. Mol Pain 2018; 14:1744806918788648. [PMID: 29956587 PMCID: PMC6053256 DOI: 10.1177/1744806918788648] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 06/01/2018] [Accepted: 06/08/2018] [Indexed: 01/20/2023] Open
Abstract
Painful burn injuries are among the most debilitating form of trauma, globally ranking in the top 15 leading causes of chronic disease burden. Despite its prevalence, however, chronic pain after burn injury is under-studied. We previously demonstrated the contribution of the Rac1-signaling pathway in several models of neuropathic pain, including burn injury. However, Rac1 belongs to a class of GTPases with low therapeutic utility due to their complex intracellular dynamics. To further understand the mechanistic underpinnings of burn-induced neuropathic pain, we performed a longitudinal study to address the hypothesis that inhibition of the downstream effector of Rac1, Pak1, will improve pain outcome following a second-degree burn injury. Substantial evidence has identified Pak1 as promising a clinical target in cognitive dysfunction and is required for dendritic spine dysgenesis associated with many neurological diseases. In our burn injury model, mice exhibited significant tactile allodynia and heat hyperalgesia and dendritic spine dysgenesis in the dorsal horn. Activity-dependent expression of c-fos also increased in dorsal horn neurons, an indicator of elevated central nociceptive activity. To inhibit Pak1, we repurposed an FDA-approved inhibitor, romidepsin. Treatment with romidepsin decreased dendritic spine dysgenesis, reduced c-fos expression, and rescued pain thresholds. Drug discontinuation resulted in a relapse of cellular correlates of pain and in lower pain thresholds in behavioral tests. Taken together, our findings identify Pak1 signaling as a potential molecular target for therapeutic intervention in traumatic burn-induced neuropathic pain.
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Affiliation(s)
- Yiqun Guo
- Department of Neurology, 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
| | - Curtis Benson
- Department of Neurology, 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
| | - Myriam Hill
- Department of Neurology, 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
| | - Stefanie Henry
- Department of Neurology, 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
| | - Philip Effraim
- Department of Neurology, 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, 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
| | - Sulayman Dib-Hajj
- Department of Neurology, 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
| | - Andrew M Tan
- Department of Neurology, 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
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Abstract
The sensation of pain plays a vital protecting role, alerting organisms about potentially damaging stimuli. Tissue injury is detected by nerve endings of specialized peripheral sensory neurons called nociceptors that are equipped with different ion channels activated by thermal, mechanic, and chemical stimuli. Several transient receptor potential channels have been identified as molecular transducers of thermal stimuli in pain-sensing neurons. Skin injury or inflammation leads to increased sensitivity to thermal and mechanic stimuli, clinically defined as allodynia or hyperalgesia. This hypersensitivity is also characteristic of systemic inflammatory disorders and neuropathic pain conditions. Mechanisms of thermal hyperalgesia include peripheral sensitization of nociceptor afferents and maladaptive changes in pain-encoding neurons within the central nervous system. An important aspect of pain management involves attempts to minimize the development of nociceptor hypersensitivity. However, knowledge about the cellular and molecular mechanisms causing thermal hyperalgesia and allodynia in human subjects is still limited, and such knowledge would be an essential step for the development of more effective therapies.
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Affiliation(s)
- Félix Viana
- Alicante Institute of Neurosciences, Universidad Miguel Hernández-Consejo Superior de Investigaciones Científicas, San Juan de Alicante, Spain.
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The NA v1.7 blocker protoxin II reduces burn injury-induced spinal nociceptive processing. J Mol Med (Berl) 2017; 96:75-84. [PMID: 29063143 PMCID: PMC5750333 DOI: 10.1007/s00109-017-1599-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 09/07/2017] [Accepted: 10/02/2017] [Indexed: 12/19/2022]
Abstract
Controlling pain in burn-injured patients poses a major clinical challenge. Recent findings suggest that reducing the activity of the voltage-gated sodium channel Nav1.7 in primary sensory neurons could provide improved pain control in burn-injured patients. Here, we report that partial thickness scalding-type burn injury on the rat paw upregulates Nav1.7 expression in primary sensory neurons 3 h following injury. The injury also induces upregulation in phosphorylated cyclic adenosine monophosphate response element-binding protein (p-CREB), a marker for nociceptive activation in primary sensory neurons. The upregulation in p-CREB occurs mainly in Nav1.7-immunopositive neurons and exhibits a peak at 5 min and, following a decline at 30 min, a gradual increase from 1 h post-injury. The Nav1.7 blocker protoxin II (ProTxII) or morphine injected intraperitoneally 15 min before or after the injury significantly reduces burn injury-induced spinal upregulation in phosphorylated serine 10 in histone H3 and phosphorylated extracellular signal-regulated kinase 1/2, which are both markers for spinal nociceptive processing. Further, ProTxII significantly reduces the frequency of spontaneous excitatory post-synaptic currents in spinal dorsal horn neurons following burn injury. Together, these findings indicate that using Nav1.7 blockers should be considered to control pain in burn injury. KEY MESSAGES • Burn injury upregulates Nav1.7 expression in primary sensory neurons. • Burn injury results in increased activity of Nav1.7-expressing primary sensory neurons. • Inhibiting Nav1.7 by protoxin II reduces spinal nociceptive processing. • Nav1.7 represents a potential target to reduce pain in burn injury.
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44
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Vetter I, Deuis JR, Mueller A, Israel MR, Starobova H, Zhang A, Rash LD, Mobli M. NaV1.7 as a pain target – From gene to pharmacology. Pharmacol Ther 2017; 172:73-100. [DOI: 10.1016/j.pharmthera.2016.11.015] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Hockley JRF, González-Cano R, McMurray S, Tejada-Giraldez MA, McGuire C, Torres A, Wilbrey AL, Cibert-Goton V, Nieto FR, Pitcher T, Knowles CH, Baeyens JM, Wood JN, Winchester WJ, Bulmer DC, Cendán CM, McMurray G. Visceral and somatic pain modalities reveal Na V 1.7-independent visceral nociceptive pathways. J Physiol 2017; 595:2661-2679. [PMID: 28105664 DOI: 10.1113/jp272837] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Accepted: 01/16/2017] [Indexed: 12/17/2022] Open
Abstract
KEY POINTS Voltage-gated sodium channels play a fundamental role in determining neuronal excitability. Specifically, voltage-gated sodium channel subtype NaV 1.7 is required for sensing acute and inflammatory somatic pain in mice and humans but its significance in pain originating from the viscera is unknown. Using comparative behavioural models evoking somatic and visceral pain pathways, we identify the requirement for NaV 1.7 in regulating somatic (noxious heat pain threshold) but not in visceral pain signalling. These results enable us to better understand the mechanisms underlying the transduction of noxious stimuli from the viscera, suggest that the investigation of pain pathways should be undertaken in a modality-specific manner and help to direct drug discovery efforts towards novel visceral analgesics. ABSTRACT Voltage-gated sodium channel NaV 1.7 is required for acute and inflammatory pain in mice and humans but its significance for visceral pain is unknown. Here we examine the role of NaV 1.7 in visceral pain processing and the development of referred hyperalgesia using a conditional nociceptor-specific NaV 1.7 knockout mouse (NaV 1.7Nav1.8 ) and selective small-molecule NaV 1.7 antagonist PF-5198007. NaV 1.7Nav1.8 mice showed normal nociceptive behaviours in response to intracolonic application of either capsaicin or mustard oil, stimuli known to evoke sustained nociceptor activity and sensitization following tissue damage, respectively. Normal responses following induction of cystitis by cyclophosphamide were also observed in both NaV 1.7Nav1.8 and littermate controls. Loss, or blockade, of NaV 1.7 did not affect afferent responses to noxious mechanical and chemical stimuli in nerve-gut preparations in mouse, or following antagonism of NaV 1.7 in resected human appendix stimulated by noxious distending pressures. However, expression analysis of voltage-gated sodium channel α subunits revealed NaV 1.7 mRNA transcripts in nearly all retrogradely labelled colonic neurons, suggesting redundancy in function. By contrast, using comparative somatic behavioural models we identify that genetic deletion of NaV 1.7 (in NaV 1.8-expressing neurons) regulates noxious heat pain threshold and that this can be recapitulated by the selective NaV 1.7 antagonist PF-5198007. Our data demonstrate that NaV 1.7 (in NaV 1.8-expressing neurons) contributes to defined pain pathways in a modality-dependent manner, modulating somatic noxious heat pain, but is not required for visceral pain processing, and advocate that pharmacological block of NaV 1.7 alone in the viscera may be insufficient in targeting chronic visceral pain.
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Affiliation(s)
- James R F Hockley
- Neuroscience and Pain Research Unit, Pfizer Ltd., The Portway Building, Granta Science Park, Cambridge, CB21 6GS, UK
| | - Rafael González-Cano
- Department of Pharmacology, Biomedical Research Centre (CIBM) and Institute of Neuroscience, Faculty of Medicine, University of Granada, Granada, Spain
| | - Sheridan McMurray
- Neuroscience and Pain Research Unit, Pfizer Ltd., The Portway Building, Granta Science Park, Cambridge, CB21 6GS, UK
| | - Miguel A Tejada-Giraldez
- Department of Pharmacology, Biomedical Research Centre (CIBM) and Institute of Neuroscience, Faculty of Medicine, University of Granada, Granada, Spain
| | - Cian McGuire
- National Centre for Bowel Research and Surgical Innovation, Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, E1 2AT, UK
| | - Antonio Torres
- Department of Biochemistry, Biomedical Research Centre (CIBM) and Institute of Neuroscience, Faculty of Medicine, University of Granada, Granada, Spain
| | - Anna L Wilbrey
- Neuroscience and Pain Research Unit, Pfizer Ltd., The Portway Building, Granta Science Park, Cambridge, CB21 6GS, UK
| | - Vincent Cibert-Goton
- National Centre for Bowel Research and Surgical Innovation, Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, E1 2AT, UK
| | - Francisco R Nieto
- Department of Pharmacology, Biomedical Research Centre (CIBM) and Institute of Neuroscience, Faculty of Medicine, University of Granada, Granada, Spain
| | - Thomas Pitcher
- Neuroscience and Pain Research Unit, Pfizer Ltd., The Portway Building, Granta Science Park, Cambridge, CB21 6GS, UK
| | - Charles H Knowles
- National Centre for Bowel Research and Surgical Innovation, Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, E1 2AT, UK
| | - José Manuel Baeyens
- Department of Pharmacology, Biomedical Research Centre (CIBM) and Institute of Neuroscience, Faculty of Medicine, University of Granada, Granada, Spain
| | - John N Wood
- Molecular Nociception Group, Department of Biology, University College London, Gower Street, London, WC1E 6BT, UK
| | - Wendy J Winchester
- Neuroscience and Pain Research Unit, Pfizer Ltd., The Portway Building, Granta Science Park, Cambridge, CB21 6GS, UK
| | - David C Bulmer
- National Centre for Bowel Research and Surgical Innovation, Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, E1 2AT, UK
| | - Cruz Miguel Cendán
- Department of Pharmacology, Biomedical Research Centre (CIBM) and Institute of Neuroscience, Faculty of Medicine, University of Granada, Granada, Spain
| | - Gordon McMurray
- Neuroscience and Pain Research Unit, Pfizer Ltd., The Portway Building, Granta Science Park, Cambridge, CB21 6GS, UK
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FGF13 Selectively Regulates Heat Nociception by Interacting with Nav1.7. Neuron 2017; 93:806-821.e9. [DOI: 10.1016/j.neuron.2017.01.009] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Revised: 12/15/2016] [Accepted: 01/04/2017] [Indexed: 12/19/2022]
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Li Z, Yang X, Song X, Ma H, Zhang P. Chitosan Oligosaccharide Reduces Propofol Requirements and Propofol-Related Side Effects. Mar Drugs 2016; 14:md14120234. [PMID: 28009824 PMCID: PMC5192471 DOI: 10.3390/md14120234] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Revised: 11/24/2016] [Accepted: 11/29/2016] [Indexed: 12/18/2022] Open
Abstract
Propofol is one of the main sedatives but its negative side effects limit its clinical application. Chitosan oligosaccharide (COS), a kind of natural product with anti-pain and anti-inflammatory activities, may be a potential adjuvant to propofol use. A total of 94 patients receiving surgeries were evenly and randomly assigned to two groups: 10 mg/kg COS oral administration and/or placebo oral administration before being injected with propofol. The target-controlled infusion of propofol was adjusted to maintain the values of the bispectral index at 50. All patients’ pain was evaluated on a four-point scale and side effects were investigated. To explore the molecular mechanism for the functions of COS in propofol use, a mouse pain model was established. The activities of Nav1.7 were analyzed in dorsal root ganglia (DRG) cells. The results showed that the patients receiving COS pretreatment were likely to require less propofol than the patients pretreated with placebo for maintaining an anesthetic situation (p < 0.05). The degrees of injection pain were lower in a COS-pretreated group than in a propofol-pretreated group. The side effects were also more reduced in a COS-treated group than in a placebo-pretreated group. COS reduced the activity of Nav1.7 and its inhibitory function was lost when Nav1.7 was silenced (p > 0.05). COS improved propofol performance by affecting Nav1.7 activity. Thus, COS is a potential adjuvant to propofol use in surgical anesthesia.
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Affiliation(s)
- Zhiwen Li
- Department of Anesthesiology, the First Hospital of Jilin University, Changchun 130021, China.
| | - Xige Yang
- Department of Anesthesiology, the First Hospital of Jilin University, Changchun 130021, China.
| | - Xuesong Song
- Department of Anesthesiology, the First Hospital of Jilin University, Changchun 130021, China.
| | - Haichun Ma
- Department of Anesthesiology, the First Hospital of Jilin University, Changchun 130021, China.
| | - Ping Zhang
- Department of Hepatobiliary and Pancreatic Surgery, the First Hospital of Jilin University, Changchun 130021, China.
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Yin K, Deuis JR, Lewis RJ, Vetter I. Transcriptomic and behavioural characterisation of a mouse model of burn pain identify the cholecystokinin 2 receptor as an analgesic target. Mol Pain 2016; 12:12/0/1744806916665366. [PMID: 27573516 PMCID: PMC5007901 DOI: 10.1177/1744806916665366] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Accepted: 07/22/2016] [Indexed: 12/23/2022] Open
Abstract
Burn injury is a cause of significant mortality and morbidity worldwide and is frequently associated with severe and long-lasting pain that remains difficult to manage throughout recovery. We characterised a mouse model of burn-induced pain using pharmacological and transcriptomic approaches. Mechanical allodynia elicited by burn injury was partially reversed by meloxicam (5 mg/kg), gabapentin (100 mg/kg) and oxycodone (3 and 10 mg/kg), while thermal allodynia and gait abnormalities were only significantly improved by amitriptyline (3 mg/kg) and oxycodone (10 mg/kg). The need for relatively high opioid doses to elicit analgesia suggested a degree of opioid resistance, similar to that shown clinically in burn patients. We thus assessed the gene expression changes in dorsal root ganglion neurons and pathophysiological mechanisms underpinning burn injury-induced pain using a transcriptomic approach. Burn injury was associated with significantly increased expression of genes associated with axon guidance, neuropeptide signalling, behavioural defence response and extracellular signalling, confirming a mixed neuropathic and inflammatory aetiology. Notably, among the pain-related genes that were upregulated post-injury was the cholecystokinin 2 receptor (Cckbr), a G protein-coupled receptor known as a pain target involved in reducing opioid effectiveness. Indeed, the clinically used cholecystokinin receptor antagonist proglumide (30 mg/kg) was effective at reversing mechanical allodynia, with additional analgesia evident in combination with low-dose oxycodone (1 mg/kg), including significant reversal of thermal allodynia. These findings highlight the complex pathophysiological mechanisms underpinning burn injury-induced pain and suggest that cholecystokinin-2 receptor antagonists may be useful clinically as adjuvants to decrease opioid requirements and improve analgesic management.
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Affiliation(s)
- Kathleen Yin
- Centre for Pain Research, Institute for Molecular Bioscience, University of Queensland, Queensland, Australia
| | - Jennifer R Deuis
- Centre for Pain Research, Institute for Molecular Bioscience, University of Queensland, Queensland, Australia
| | - Richard J Lewis
- Centre for Pain Research, Institute for Molecular Bioscience, University of Queensland, Queensland, Australia
| | - Irina Vetter
- Centre for Pain Research, Institute for Molecular Bioscience, University of Queensland, Queensland, Australia Pharmacy Australia Centre of Excellence, University of Queensland, Queensland, Australia
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Cai W, Cao J, Ren X, Qiao L, Chen X, Li M, Zang W. shRNA mediated knockdown of Nav1.7 in rat dorsal root ganglion attenuates pain following burn injury. BMC Anesthesiol 2016; 16:59. [PMID: 27514860 PMCID: PMC4982321 DOI: 10.1186/s12871-016-0215-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Accepted: 07/21/2016] [Indexed: 11/16/2022] Open
Abstract
Background Abnormal acute pain after burn injury still torments patients severely. In this study, we investigated that one voltage gated sodium channel Nav1.7 plays a vital role in lowering heat pain threshold after burn injury, and the hypothesis that knockdown of Nav1.7 attenuates pain following burn injury. Methods Sixty eight adult male Sprague–Dawley rats were divided into 4 treatment groups: (1) sham, which hind paw was put on the room temperature metal plate for 15 s (2) burn model, which hind paw was put on the 85 °C metal plate for 15 s. (3) Burn injury + lentiviral vector -SCN9AsiRNA-GFP (LV- SCN9AsiRNA-GFP group, n = 18), which receive the DRG microinjection of LV- SCN9AsiRNA-GFP on the zero day. (4) Burn injury + lentiviral vector negative control (LV-NC-GFP group, n = 18), which receive the DRG microinjection of empty lentiviral vector on the zero day. Results Both mechanical and heat threshold were measured from day 1 to 21. Meanwhile, expression of sodium channels Nav1.7 in injured dorsal root ganglia were measured on post-operative days 7(POD 7). Rats exhibited decreased thresholds on both mechanical allodynia and thermal withdrawl latency, accompanied by increased Nav1.7 and c-fos expression in dorsal root ganglion (DRG). And knockdown of Nav1.7 in L5DRG led to the attenuation of burn injury-induced mechanical allodynia and thermal hyperalgesia in the rats. Conclusion We provide evidence that shRNA mediated knockdown of Nav1.7 attenuates burn induced pain in rats as well as decreased the activiation of c-fos protein.
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Affiliation(s)
- Weihua Cai
- Department of Anatomy, School of Basic Medical Sciences, Zhengzhou University, Henan, China
| | - Jing Cao
- Department of Anatomy, School of Basic Medical Sciences, Zhengzhou University, Henan, China
| | - Xiuhua Ren
- Department of Anatomy, School of Basic Medical Sciences, Zhengzhou University, Henan, China
| | - Liang Qiao
- Department of E.N.T, Zhoukou Central Hospital, Henan, China
| | - Xuemei Chen
- Department of Anatomy, School of Basic Medical Sciences, Zhengzhou University, Henan, China
| | - Ming Li
- Department of Anatomy, School of Basic Medical Sciences, Zhengzhou University, Henan, China
| | - Weidong Zang
- Department of Anatomy, School of Basic Medical Sciences, Zhengzhou University, Henan, China.
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50
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McEntire DM, Kirkpatrick DR, Dueck NP, Kerfeld MJ, Smith TA, Nelson TJ, Reisbig MD, Agrawal DK. Pain transduction: a pharmacologic perspective. Expert Rev Clin Pharmacol 2016; 9:1069-80. [PMID: 27137678 DOI: 10.1080/17512433.2016.1183481] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
INTRODUCTION Pain represents a necessary physiological function yet remains a significant pathological process in humans across the world. The transduction of a nociceptive stimulus refers to the processes that turn a noxious stimulus into a transmissible neurological signal. This involves a number of ion channels that facilitate the conversion of nociceptive stimulus into and electrical signal. AREAS COVERED An understanding of nociceptive physiology complements a discussion of analgesic pharmacology. Therefore, the two are presented together. In this review article, a critical evaluation is provided on research findings relating to both the physiology and pharmacology of relevant acid-sensing ion channels (ASICs), transient receptor potential (TRP) cation channels, and voltage-gated sodium (Nav) channels. Expert commentary: Despite significant steps toward identifying new and more effective modalities to treat pain, there remain many avenues of inquiry related to pain transduction. The activity of ASICs in nociception has been demonstrated but the physiology is not fully understood. A number of medications appear to interact with ASICs but no research has demonstrated pain-relieving clinical utility. Direct antagonism of TRPV1 channels is not in practice due to concerning side effects. However, work in this area is ongoing. Additional research in the of TRPA1, TRPV3, and TRPM8 may yield useful results. Local anesthetics are widely used. However, the risk for systemic effects limits the maximal safe dosage. Selective Nav antagonists have been identified that lack systemic effects.
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Affiliation(s)
- Dan M McEntire
- a Department of Clinical and Translational Science and Department of Anesthesiology , Creighton University School of Medicine , Omaha , NE , USA
| | - Daniel R Kirkpatrick
- a Department of Clinical and Translational Science and Department of Anesthesiology , Creighton University School of Medicine , Omaha , NE , USA
| | - Nicholas P Dueck
- a Department of Clinical and Translational Science and Department of Anesthesiology , Creighton University School of Medicine , Omaha , NE , USA
| | - Mitchell J Kerfeld
- a Department of Clinical and Translational Science and Department of Anesthesiology , Creighton University School of Medicine , Omaha , NE , USA
| | - Tyler A Smith
- a Department of Clinical and Translational Science and Department of Anesthesiology , Creighton University School of Medicine , Omaha , NE , USA
| | - Taylor J Nelson
- a Department of Clinical and Translational Science and Department of Anesthesiology , Creighton University School of Medicine , Omaha , NE , USA
| | - Mark D Reisbig
- a Department of Clinical and Translational Science and Department of Anesthesiology , Creighton University School of Medicine , Omaha , NE , USA
| | - Devendra K Agrawal
- a Department of Clinical and Translational Science and Department of Anesthesiology , Creighton University School of Medicine , Omaha , NE , USA
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