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Zhang L, Cui Y, An L, Li J, Yao Y, Bai Y, Li X, Yao X, Wu K. Genome-wide identification of the CNGC gene family and negative regulation of drought tolerance by HvCNGC3 and HvCNGC16 in transgenic Arabidopsis thaliana. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2024; 210:108593. [PMID: 38615446 DOI: 10.1016/j.plaphy.2024.108593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 02/18/2024] [Accepted: 04/01/2024] [Indexed: 04/16/2024]
Abstract
Cyclic nucleotide-gated ion channels (CNGCs), as non-selective cation channels, play essential roles in plant growth and stress responses. However, they have not been identified in Qingke (Hordeum vulgare L.). Here, we performed a comprehensive genome-wide identification and function analysis of the HvCNGC gene family to determine its role in drought tolerance. Phylogenetic analysis showed that 27 HvCNGC genes were divided into four groups and unevenly located on seven chromosomes. Transcription analysis revealed that two closely related members of HvCNGC3 and HvCNGC16 were highly induced and the expression of both genes were distinctly different in two extremely drought-tolerant materials. Transient expression revealed that the HvCNGC3 and HvCNGC16 proteins both localized to the plasma membrane and karyotheca. Overexpression of HvCNGC3 and HvCNGC16 in Arabidopsis thaliana led to impaired seed germination and seedling drought tolerance, which was accompanied by higher hydrogen peroxide (H2O2), malondialdehyde (MDA), proline accumulation and increased cell damage. In addition, HvCNGC3 and HvCNGC16-overexpression lines reduced ABA sensitivity, as well as lower expression levels of some ABA biosynthesis and stress-related gene in transgenic lines. Furthermore, Yeast two hybrid (Y2H) and bimolecular fluorescence complementation (BiFC) assays revealed that HvCNGC3 and HvCNGC16 interacted with calmodulin/calmodulin-like proteins (CaM/CML), which, as calcium sensors, participate in the perception and decoding of intracellular calcium signaling. Thus, this study provides information on the CNGC gene family and provides insight into the function and potential regulatory mechanism of HvCNGC3 and HvCNGC16 in drought tolerance in Qingke.
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Affiliation(s)
- Li Zhang
- Academy of Agricultural and Forestry Sciences, Qinghai University, 810016, Xining, China; Laboratory for Research and Utilization of Qinghai Tibet Plateau Germplasm Resources, 810016, Xining, China; Qinghai Key Laboratory of Hulless Barley Genetics and Breeding, 810016, Xining, China; Oinghai Hulless Barley Subcenter of National Triticeae Improvement Center, 810016, Xining, China
| | - Yongmei Cui
- Academy of Agricultural and Forestry Sciences, Qinghai University, 810016, Xining, China; Laboratory for Research and Utilization of Qinghai Tibet Plateau Germplasm Resources, 810016, Xining, China; Qinghai Key Laboratory of Hulless Barley Genetics and Breeding, 810016, Xining, China; Oinghai Hulless Barley Subcenter of National Triticeae Improvement Center, 810016, Xining, China
| | - Likun An
- Academy of Agricultural and Forestry Sciences, Qinghai University, 810016, Xining, China; Laboratory for Research and Utilization of Qinghai Tibet Plateau Germplasm Resources, 810016, Xining, China; Qinghai Key Laboratory of Hulless Barley Genetics and Breeding, 810016, Xining, China; Oinghai Hulless Barley Subcenter of National Triticeae Improvement Center, 810016, Xining, China
| | - Jie Li
- Academy of Agricultural and Forestry Sciences, Qinghai University, 810016, Xining, China; Laboratory for Research and Utilization of Qinghai Tibet Plateau Germplasm Resources, 810016, Xining, China; Qinghai Key Laboratory of Hulless Barley Genetics and Breeding, 810016, Xining, China; Oinghai Hulless Barley Subcenter of National Triticeae Improvement Center, 810016, Xining, China
| | - Youhua Yao
- Academy of Agricultural and Forestry Sciences, Qinghai University, 810016, Xining, China; Laboratory for Research and Utilization of Qinghai Tibet Plateau Germplasm Resources, 810016, Xining, China; Qinghai Key Laboratory of Hulless Barley Genetics and Breeding, 810016, Xining, China; Oinghai Hulless Barley Subcenter of National Triticeae Improvement Center, 810016, Xining, China
| | - Yixiong Bai
- Academy of Agricultural and Forestry Sciences, Qinghai University, 810016, Xining, China; Laboratory for Research and Utilization of Qinghai Tibet Plateau Germplasm Resources, 810016, Xining, China; Qinghai Key Laboratory of Hulless Barley Genetics and Breeding, 810016, Xining, China; Oinghai Hulless Barley Subcenter of National Triticeae Improvement Center, 810016, Xining, China
| | - Xin Li
- Academy of Agricultural and Forestry Sciences, Qinghai University, 810016, Xining, China; Laboratory for Research and Utilization of Qinghai Tibet Plateau Germplasm Resources, 810016, Xining, China; Qinghai Key Laboratory of Hulless Barley Genetics and Breeding, 810016, Xining, China; Oinghai Hulless Barley Subcenter of National Triticeae Improvement Center, 810016, Xining, China
| | - Xiaohua Yao
- Academy of Agricultural and Forestry Sciences, Qinghai University, 810016, Xining, China; Laboratory for Research and Utilization of Qinghai Tibet Plateau Germplasm Resources, 810016, Xining, China; Qinghai Key Laboratory of Hulless Barley Genetics and Breeding, 810016, Xining, China; Oinghai Hulless Barley Subcenter of National Triticeae Improvement Center, 810016, Xining, China
| | - Kunlun Wu
- Academy of Agricultural and Forestry Sciences, Qinghai University, 810016, Xining, China; Laboratory for Research and Utilization of Qinghai Tibet Plateau Germplasm Resources, 810016, Xining, China; Qinghai Key Laboratory of Hulless Barley Genetics and Breeding, 810016, Xining, China; Oinghai Hulless Barley Subcenter of National Triticeae Improvement Center, 810016, Xining, China.
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Boada MD, Gutierrez S. Mechanical and cold polymodality coexist in tactile peripheral afferents, and it's not mediated by TRPM8. Mol Pain 2024; 20:17448069241276378. [PMID: 39107056 PMCID: PMC11367603 DOI: 10.1177/17448069241276378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2024] [Revised: 07/25/2024] [Accepted: 07/25/2024] [Indexed: 08/09/2024] Open
Abstract
In the mammalian somatosensory system, polymodality is defined as the competence of some neurons to respond to multiple forms of energy (e.g., mechanical and thermal). This ability is thought to be an exclusive property of nociceptive neurons (polymodal C-fiber nociceptors) and one of the pillars of nociceptive peripheral plasticity. The current study uncovered a completely different neuronal sub-population with polymodal capabilities on the opposite mechanical modality spectrum (tactile). We have observed that several tactile afferents (1/5) can respond to cold in non-nociceptive ranges. These cells' mechanical thresholds and electrical properties are similar to any low-threshold mechano-receptors (LT), conducting in a broad range of velocities (Aδ to Aβ), lacking CGRP and TRPM8 receptors. Due to its density, cold-response range, speed, and response to injury (or lack thereof), we speculate on its role in controlling reflexive behaviors (wound liking and rubbing) and modulation of nociceptive spinal cord integration. Further studies are required to understand the mechanisms behind this neuron's polymodality, central architecture, and impact on pain perception.
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Affiliation(s)
- M Danilo Boada
- Department of Anesthesiology, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Silvia Gutierrez
- Department of Anesthesiology, Wake Forest School of Medicine, Winston-Salem, NC, USA
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Anand S, Rajagopal S. A Comprehensive Review on the Regulatory Action of TRP Channels: A Potential Therapeutic Target for Nociceptive Pain. Neurosci Insights 2023; 18:26331055231220340. [PMID: 38146332 PMCID: PMC10749524 DOI: 10.1177/26331055231220340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Accepted: 11/28/2023] [Indexed: 12/27/2023] Open
Abstract
The transient receptor potential (TRP) superfamily of ion channels in humans comprises voltage-gated, non-selective cation channels expressed both in excitable as well as non-excitable cells. Four TRP channel subunits associate to create functional homo- or heterotetramers that allow the influx of calcium, sodium, and/or potassium. These channels are highly abundant in the brain and kidney and are important mediators of diverse biological functions including thermosensation, vascular tone, flow sensing in the kidney and irritant stimuli sensing. Inherited or acquired dysfunction of TRP channels influences cellular functions and signaling pathways resulting in multifaceted disorders affecting skeletal, renal, cardiovascular, and nervous systems. Studies have demonstrated the involvement of these channels in the generation and transduction of pain. Based on the multifaceted role orchestrated by these TRP channels, modulation of the activity of these channels presents an important strategy to influence cellular function by regulating intracellular calcium levels as well as membrane excitability. Therefore, there has been a remarkable pharmaceutical inclination toward TRP channels as therapeutic interventions. Several candidate drugs influencing the activity of these channels are already in the clinical trials pipeline. The present review encompasses the current understanding of TRP channels and TRP modulators in pain and pain management.
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Affiliation(s)
- Santosh Anand
- Department of Biotechnology, School of Applied Sciences, REVA University, Bengaluru, Karnataka, India
| | - Senthilkumar Rajagopal
- Department of Biotechnology, School of Applied Sciences, REVA University, Bengaluru, Karnataka, India
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O’Brien F, Feetham CH, Staunton CA, Hext K, Barrett-Jolley R. Temperature modulates PVN pre-sympathetic neurones via transient receptor potential ion channels. Front Pharmacol 2023; 14:1256924. [PMID: 37920211 PMCID: PMC10618372 DOI: 10.3389/fphar.2023.1256924] [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: 07/11/2023] [Accepted: 10/03/2023] [Indexed: 11/04/2023] Open
Abstract
The paraventricular nucleus (PVN) of the hypothalamus plays a vital role in maintaining homeostasis and modulates cardiovascular function via autonomic pre-sympathetic neurones. We have previously shown that coupling between transient receptor potential cation channel subfamily V Member 4 (Trpv4) and small-conductance calcium-activated potassium channels (SK) in the PVN facilitate osmosensing, but since TRP channels are also thermosensitive, in this report we investigated the temperature sensitivity of these neurones. Methods: TRP channel mRNA was quantified from mouse PVN with RT-PCR and thermosensitivity of Trpv4-like PVN neuronal ion channels characterised with cell-attached patch-clamp electrophysiology. Following recovery of temperature-sensitive single-channel kinetic schema, we constructed a predictive stochastic mathematical model of these neurones and validated this with electrophysiological recordings of action current frequency. Results: 7 thermosensitive TRP channel genes were found in PVN punches. Trpv4 was the most abundant of these and was identified at the single channel level on PVN neurones. We investigated the thermosensitivity of these Trpv4-like channels; open probability (Po) markedly decreased when temperature was decreased, mediated by a decrease in mean open dwell times. Our neuronal model predicted that PVN spontaneous action current frequency (ACf) would increase as temperature is decreased and in our electrophysiological experiments, we found that ACf from PVN neurones was significantly higher at lower temperatures. The broad-spectrum channel blocker gadolinium (100 µM), was used to block the warm-activated, Ca2+-permeable Trpv4 channels. In the presence of gadolinium (100 µM), the temperature effect was largely retained. Using econazole (10 µM), a blocker of Trpm2, we found there were significant increases in overall ACf and the temperature effect was inhibited. Conclusion: Trpv4, the abundantly transcribed thermosensitive TRP channel gene in the PVN appears to contribute to intrinsic thermosensitive properties of PVN neurones. At physiological temperatures (37°C), we observed relatively low ACf primarily due to the activity of Trpm2 channels, whereas at room temperature, where most of the previous characterisation of PVN neuronal activity has been performed, ACf is much higher, and appears to be predominately due to reduced Trpv4 activity. This work gives insight into the fundamental mechanisms by which the body decodes temperature signals and maintains homeostasis.
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Affiliation(s)
| | | | | | | | - Richard Barrett-Jolley
- Department of Musculoskeletal Ageing Science, Faculty of Health and Life Sciences, University of Liverpool, Liverpool, United Kingdom
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Iannone LF, De Logu F, Geppetti P, De Cesaris F. The role of TRP ion channels in migraine and headache. Neurosci Lett 2022; 768:136380. [PMID: 34861342 DOI: 10.1016/j.neulet.2021.136380] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 10/08/2021] [Accepted: 10/17/2021] [Indexed: 12/15/2022]
Abstract
Migraine afflicts more than 10% of the general population. Although its mechanism is poorly understood, recent preclinical and clinical evidence has identified calcitonin gene related peptide (CGRP) as a major mediator of migraine pain. CGRP, which is predominantly expressed in a subset of primary sensory neurons, including trigeminal afferents, when released from peripheral terminals of nociceptors, elicits arteriolar vasodilation and mechanical allodynia, a hallmark of migraine attack. Transient receptor potential (TRP) channels include several cationic channels with pleiotropic functions and ubiquitous distribution in various cells and tissues. Some members of the TRP channel family, such as the ankyrin 1 (TRPA1), vanilloid 1 and 4 (TRPV1 and TRPV4, respectively), and TRPM3, are abundantly expressed in primary sensory neurons and are recognized as sensors of chemical-, heat- and mechanical-induced pain, and play a primary role in several models of pain diseases, including inflammatory, neuropathic cancer pain, and migraine pain. In addition, TRP channel stimulation results in CGRP release, which can be activated or sensitized by various endogenous and exogenous stimuli, some of which have been proven to trigger or worsen migraine attacks. Moreover, some antimigraine medications seem to act through TRPA1 antagonism. Here we review the preclinical and clinical evidence that highlights the role of TRP channels, and mainly TRPA1, in migraine pathophysiology and may be proposed as new targets for its treatment.
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Affiliation(s)
- Luigi Francesco Iannone
- Headache Center and Clinical Pharmacology Unit, Careggi University Hospital, Florence, Italy
| | - Francesco De Logu
- Section of Clinical Pharmacology and Oncology, Department of Health Sciences, University of Florence, Florence, Italy
| | - Pierangelo Geppetti
- Headache Center and Clinical Pharmacology Unit, Careggi University Hospital, Florence, Italy; Section of Clinical Pharmacology and Oncology, Department of Health Sciences, University of Florence, Florence, Italy
| | - Francesco De Cesaris
- Headache Center and Clinical Pharmacology Unit, Careggi University Hospital, Florence, Italy.
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Nazıroğlu M, Öz A, Yıldızhan K. Selenium and Neurological Diseases: Focus on Peripheral Pain and TRP Channels. Curr Neuropharmacol 2021; 18:501-517. [PMID: 31903884 PMCID: PMC7457405 DOI: 10.2174/1570159x18666200106152631] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 11/26/2019] [Accepted: 01/04/2020] [Indexed: 12/18/2022] Open
Abstract
Pain is a complex physiological process that includes many components. Growing evidence supports the idea that oxidative stress and Ca2+ signaling pathways participate in pain detection by neurons. The main source of endogenous reactive oxygen species (ROS) is mitochondrial dysfunction induced by membrane depolarization, which is in turn caused by Ca2+ influx into the cytosol of neurons. ROS are controlled by antioxidants, including selenium. Selenium plays an important role in the nervous system, including the brain, where it acts as a cofactor for glutathione peroxidase and is incorporated into selenoproteins involved in antioxidant defenses. It has neuroprotective effects through modulation of excessive ROS production, inflammation, and Ca2+ overload in several diseases, including inflammatory pain, hypersensitivity, allodynia, diabetic neuropathic pain, and nociceptive pain. Ca2+ entry across membranes is mediated by different channels, including transient receptor potential (TRP) channels, some of which (e.g., TRPA1, TRPM2, TRPV1, and TRPV4) can be activated by oxidative stress and have a role in the induction of peripheral pain. The results of recent studies indicate the modulator roles of selenium in peripheral pain through inhibition of TRP channels in the dorsal root ganglia of experimental animals. This review summarizes the protective role of selenium in TRP channel regulation, Ca2+ signaling, apoptosis, and mitochondrial oxidative stress in peripheral pain induction.
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Affiliation(s)
- Mustafa Nazıroğlu
- Neuroscience Research Center, Suleyman Demirel University, Isparta, Turkey.,Department of Biophysics, Faculty of Medicine, Suleyman Demirel University, Isparta, Turkey.,Drug Discovery Unit, BSN Health, Analysis and Innovation Ltd. Inc. Teknokent, Isparta, Turkey
| | - Ahmi Öz
- Department of Biophysics, Faculty of Medicine, Suleyman Demirel University, Isparta, Turkey
| | - Kenan Yıldızhan
- Department of Biophysics, Faculty of Medicine, Suleyman Demirel University, Isparta, Turkey
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Liu BL, Cao QL, Zhao X, Liu HZ, Zhang YQ. Inhibition of TRPV1 by SHP-1 in nociceptive primary sensory neurons is critical in PD-L1 analgesia. JCI Insight 2020; 5:137386. [PMID: 32960817 PMCID: PMC7605531 DOI: 10.1172/jci.insight.137386] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Accepted: 09/10/2020] [Indexed: 12/15/2022] Open
Abstract
Recently programmed death-ligand 1 (PD-L1) receptor PD-1 was found in dorsal root ganglion (DRG) neurons, and PD-L1 activates PD-1 to inhibit inflammatory and neuropathic pain by modulating neuronal excitability. However, the downstream signaling of PD-1 in sensory neurons remains unclear. Here, we show that PD-L1 activated Src homology 2 domain-containing tyrosine phosphatase-1 (SHP-1) to downregulate transient receptor potential vanilloid 1 (TRPV1) in DRG neurons and inhibit bone cancer pain in mice. Local injection of PD-L1 produced analgesia. PD-1 in DRG neurons colocalized with TRPV1 and SHP-1. PD-L1 induced the phosphorylation of SHP-1 in DRG TRPV1 neurons and inhibited TRPV1 currents. Loss of TRPV1 in mice abolished bone cancer–induced thermal hyperalgesia and PD-L1 analgesia. Conditioned deletion of SHP-1 in NaV1.8+ neurons aggravated bone cancer pain and diminished the inhibition of PD-L1 on TRPV1 currents and pain. Together, our findings suggest that PD-L1/PD-1 signaling suppresses bone cancer pain via inhibition of TRPV1 activity. Our results also suggest that SHP-1 in sensory neurons is an endogenous pain inhibitor and delays the development of bone cancer pain via suppressing TRPV1 function. PD-L1/PD-1 signaling suppresses TRPV1 activity and alleviates pain-like behaviors via phosphorylation of SHP-1 in nociceptive primary sensory neurons in a mouse bone cancer model.
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Affiliation(s)
- Ben-Long Liu
- State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, Institutes of Brain Science, Fudan University, Shanghai, China
| | - Qi-Lai Cao
- State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, Institutes of Brain Science, Fudan University, Shanghai, China
| | - Xin Zhao
- State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, Institutes of Brain Science, Fudan University, Shanghai, China
| | - Hui-Zhu Liu
- State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, Institutes of Brain Science, Fudan University, Shanghai, China
| | - Yu-Qiu Zhang
- State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, Institutes of Brain Science, Fudan University, Shanghai, China.,Institutes of Integrative Medicine, Fudan University, Shanghai, China
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Jin SS, He DQ, Wang Y, Zhang T, Yu HJ, Li ZX, Zhu LS, Zhou YH, Liu Y. Mechanical force modulates periodontal ligament stem cell characteristics during bone remodelling via TRPV4. Cell Prolif 2020; 53:e12912. [PMID: 32964544 PMCID: PMC7574874 DOI: 10.1111/cpr.12912] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 08/19/2020] [Accepted: 09/06/2020] [Indexed: 12/13/2022] Open
Abstract
OBJECTIVES Mechanical force plays an important role in modulating stem cell fate and behaviours. However, how periodontal ligament stem cells (PDLSCs) perceive mechanical stimulus and transfer it into biological signals, and thereby promote alveolar bone remodelling, is unclear. MATERIALS AND METHODS An animal model of force-induced tooth movement and a compressive force in vitro was used. After force application, tooth movement distance, mesenchymal stem cell and osteoclast number, and proinflammatory cytokine expression were detected in periodontal tissues. Then, rat primary PDLSCs with or without force loading were isolated, and their stem cell characteristics including clonogenicity, proliferation, multipotent differentiation and immunoregulatory properties were evaluated. Under compressive force in vitro, the effects of the ERK signalling pathway on PDLSC characteristics were evaluated by Western blotting. RESULTS Mechanical force in vivo induced PDLSC proliferation, which was accompanied with inflammatory cytokine accumulation, osteoclast differentiation and TRPV4 activation; the force-stimulated PDLSCs showed greater clonogenicity and proliferation, reduced differentiation ability, improved induction of macrophage migration, osteoclast differentiation and proinflammatory factor expression. The biological changes induced by mechanical force could be partially suppressed by TRPV4 inhibition. Mechanistically, force-induced activation of TRPV4 in PDLSCs regulated osteoclast differentiation by affecting the RANKL/OPG system via ERK signalling. CONCLUSIONS Taken together, we show here that TRPV4 activation in PDLSCs under mechanical force contributes to changing their stem cell characteristics and modulates bone remodelling during tooth movement.
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Affiliation(s)
- Shan-Shan Jin
- Laboratory of Biomimetic Nanomaterials, Department of Orthodontics, Peking University School and Hospital of Stomatology, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, China
| | - Dan-Qing He
- Laboratory of Biomimetic Nanomaterials, Department of Orthodontics, Peking University School and Hospital of Stomatology, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, China
| | - Yu Wang
- Laboratory of Biomimetic Nanomaterials, Department of Orthodontics, Peking University School and Hospital of Stomatology, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, China
| | - Ting Zhang
- Laboratory of Biomimetic Nanomaterials, Department of Orthodontics, Peking University School and Hospital of Stomatology, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, China
| | - Hua-Jie Yu
- Fourth Division, Peking University Hospital of Stomatology, Beijing, China
| | - Zi-Xin Li
- Laboratory of Biomimetic Nanomaterials, Department of Orthodontics, Peking University School and Hospital of Stomatology, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, China
| | - Li-Sha Zhu
- Laboratory of Biomimetic Nanomaterials, Department of Orthodontics, Peking University School and Hospital of Stomatology, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, China
| | - Yan-Heng Zhou
- Laboratory of Biomimetic Nanomaterials, Department of Orthodontics, Peking University School and Hospital of Stomatology, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, China
| | - Yan Liu
- Laboratory of Biomimetic Nanomaterials, Department of Orthodontics, Peking University School and Hospital of Stomatology, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, China
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9
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Nkambeu B, Salem JB, Beaudry F. Capsaicin and Its Analogues Impede Nocifensive Response of Caenorhabditis elegans to Noxious Heat. Neurochem Res 2020; 45:1851-1859. [PMID: 32418082 DOI: 10.1007/s11064-020-03049-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 05/01/2020] [Accepted: 05/05/2020] [Indexed: 01/09/2023]
Abstract
Capsaicin is the most abundant pungent molecule identified in red chili peppers, and it is widely used for food flavoring, in pepper spray for self-defense devices and recently in ointments for the relief of neuropathic pain. Capsaicin and several other related vanilloid compounds are secondary plant metabolites. Capsaicin is a selective agonist of the transient receptor potential channel, vanilloid subfamily member 1 (TRPV1). After exposition to vanilloid solution, Caenorhabditis elegans wild type (N2) and mutants were placed on petri dishes divided in quadrants for heat stimulation. Thermal avoidance index was used to phenotype each tested C. elegans experimental groups. The data revealed for the first-time that capsaicin can impede nocifensive response of C. elegans to noxious heat (32-35 °C) following a sustained exposition. The effect was reversed 6 h post capsaicin exposition. Additionally, we identified the capsaicin target, the C. elegans transient receptor potential channel OCR-2 and not OSM-9. Further experiments also undoubtedly revealed anti-nociceptive effect for capsaicin analogues, including olvanil, gingerol, shogaol and curcumin.
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Affiliation(s)
- Bruno Nkambeu
- Groupe de Recherche en Pharmacologie Animal du Québec (GREPAQ), Département de Biomédecine Vétérinaire, Faculté de Médecine Vétérinaire, Université de Montréal, 3200 Sicotte, Saint-Hyacinthe, Québec, J2S 2M2, Canada
| | - Jennifer Ben Salem
- Groupe de Recherche en Pharmacologie Animal du Québec (GREPAQ), Département de Biomédecine Vétérinaire, Faculté de Médecine Vétérinaire, Université de Montréal, 3200 Sicotte, Saint-Hyacinthe, Québec, J2S 2M2, Canada
| | - Francis Beaudry
- Groupe de Recherche en Pharmacologie Animal du Québec (GREPAQ), Département de Biomédecine Vétérinaire, Faculté de Médecine Vétérinaire, Université de Montréal, 3200 Sicotte, Saint-Hyacinthe, Québec, J2S 2M2, Canada.
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Talavera K, Startek JB, Alvarez-Collazo J, Boonen B, Alpizar YA, Sanchez A, Naert R, Nilius B. Mammalian Transient Receptor Potential TRPA1 Channels: From Structure to Disease. Physiol Rev 2019; 100:725-803. [PMID: 31670612 DOI: 10.1152/physrev.00005.2019] [Citation(s) in RCA: 218] [Impact Index Per Article: 43.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The transient receptor potential ankyrin (TRPA) channels are Ca2+-permeable nonselective cation channels remarkably conserved through the animal kingdom. Mammals have only one member, TRPA1, which is widely expressed in sensory neurons and in non-neuronal cells (such as epithelial cells and hair cells). TRPA1 owes its name to the presence of 14 ankyrin repeats located in the NH2 terminus of the channel, an unusual structural feature that may be relevant to its interactions with intracellular components. TRPA1 is primarily involved in the detection of an extremely wide variety of exogenous stimuli that may produce cellular damage. This includes a plethora of electrophilic compounds that interact with nucleophilic amino acid residues in the channel and many other chemically unrelated compounds whose only common feature seems to be their ability to partition in the plasma membrane. TRPA1 has been reported to be activated by cold, heat, and mechanical stimuli, and its function is modulated by multiple factors, including Ca2+, trace metals, pH, and reactive oxygen, nitrogen, and carbonyl species. TRPA1 is involved in acute and chronic pain as well as inflammation, plays key roles in the pathophysiology of nearly all organ systems, and is an attractive target for the treatment of related diseases. Here we review the current knowledge about the mammalian TRPA1 channel, linking its unique structure, widely tuned sensory properties, and complex regulation to its roles in multiple pathophysiological conditions.
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Affiliation(s)
- Karel Talavera
- Laboratory of Ion Channel Research, Department of Cellular and Molecular Medicine, KU Leuven; VIB Center for Brain and Disease Research, Leuven, Belgium
| | - Justyna B Startek
- Laboratory of Ion Channel Research, Department of Cellular and Molecular Medicine, KU Leuven; VIB Center for Brain and Disease Research, Leuven, Belgium
| | - Julio Alvarez-Collazo
- Laboratory of Ion Channel Research, Department of Cellular and Molecular Medicine, KU Leuven; VIB Center for Brain and Disease Research, Leuven, Belgium
| | - Brett Boonen
- Laboratory of Ion Channel Research, Department of Cellular and Molecular Medicine, KU Leuven; VIB Center for Brain and Disease Research, Leuven, Belgium
| | - Yeranddy A Alpizar
- Laboratory of Ion Channel Research, Department of Cellular and Molecular Medicine, KU Leuven; VIB Center for Brain and Disease Research, Leuven, Belgium
| | - Alicia Sanchez
- Laboratory of Ion Channel Research, Department of Cellular and Molecular Medicine, KU Leuven; VIB Center for Brain and Disease Research, Leuven, Belgium
| | - Robbe Naert
- Laboratory of Ion Channel Research, Department of Cellular and Molecular Medicine, KU Leuven; VIB Center for Brain and Disease Research, Leuven, Belgium
| | - Bernd Nilius
- Laboratory of Ion Channel Research, Department of Cellular and Molecular Medicine, KU Leuven; VIB Center for Brain and Disease Research, Leuven, Belgium
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Fisher C, Johnson K, Okerman T, Jurgenson T, Nickell A, Salo E, Moore M, Doucette A, Bjork J, Klein AH. Morphine Efficacy, Tolerance, and Hypersensitivity Are Altered After Modulation of SUR1 Subtype K ATP Channel Activity in Mice. Front Neurosci 2019; 13:1122. [PMID: 31695594 PMCID: PMC6817471 DOI: 10.3389/fnins.2019.01122] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Accepted: 10/04/2019] [Indexed: 01/26/2023] Open
Abstract
ATP-sensitive potassium (KATP) channels are found in the nervous system and are downstream targets of opioid receptors. KATP channel activity can effect morphine efficacy and may beneficial for relieving chronic pain in the peripheral and central nervous system. Unfortunately, the KATP channels exists as a heterooctomers, and the exact subtypes responsible for the contribution to chronic pain and opioid signaling in either dorsal root ganglia (DRG) or the spinal cord are yet unknown. Chronic opioid exposure (15 mg/kg morphine, s.c., twice daily) over 5 days produces significant downregulation of Kir6.2 and SUR1 in the spinal cord and DRG of mice. In vitro studies also conclude potassium flux after KATP channel agonist stimulation is decreased in neuroblastoma cells treated with morphine for several days. Mice lacking the KATP channel SUR1 subunit have reduced opioid efficacy in mechanical paw withdrawal behavioral responses compared to wild-type and heterozygous littermates (5 and 15 mg/kg, s.c., morphine). Using either short hairpin RNA (shRNA) or SUR1 cre-lox strategies, downregulation of SUR1 subtype KATP channels in the spinal cord and DRG of mice potentiated the development of morphine tolerance and withdrawal. Opioid tolerance was attenuated with intraplantar injection of SUR1 agonists, such as diazoxide and NN-414 (100 μM, 10 μL) compared to vehicle treated animals. These studies are an important first step in determining the role of KATP channel subunits in antinociception, opioid signaling, and the development of opioid tolerance, and shed light on the potential translational ability of KATP channel targeting pharmaceuticals and their possible future clinical utilization. These data suggest that increasing neuronal KATP channel activity in the peripheral nervous system may be a viable option to alleviate opioid tolerance and withdrawal.
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Affiliation(s)
- Cole Fisher
- Department of Pharmacy Practice and Pharmaceutical Sciences, College of Pharmacy, University of Minnesota, Duluth, MN, United States
| | - Kayla Johnson
- Department of Pharmacy Practice and Pharmaceutical Sciences, College of Pharmacy, University of Minnesota, Duluth, MN, United States
| | - Travis Okerman
- Department of Pharmacy Practice and Pharmaceutical Sciences, College of Pharmacy, University of Minnesota, Duluth, MN, United States
| | - Taylor Jurgenson
- Department of Pharmacy Practice and Pharmaceutical Sciences, College of Pharmacy, University of Minnesota, Duluth, MN, United States
| | - Austin Nickell
- Department of Pharmacy Practice and Pharmaceutical Sciences, College of Pharmacy, University of Minnesota, Duluth, MN, United States
| | - Erin Salo
- Department of Pharmacy Practice and Pharmaceutical Sciences, College of Pharmacy, University of Minnesota, Duluth, MN, United States
| | - Madelyn Moore
- Department of Pharmacy Practice and Pharmaceutical Sciences, College of Pharmacy, University of Minnesota, Duluth, MN, United States
| | - Alexis Doucette
- Department of Pharmacy Practice and Pharmaceutical Sciences, College of Pharmacy, University of Minnesota, Duluth, MN, United States
| | - James Bjork
- Department of Biomedical Sciences, Medical School Duluth, Duluth, MN, United States
| | - Amanda H Klein
- Department of Pharmacy Practice and Pharmaceutical Sciences, College of Pharmacy, University of Minnesota, Duluth, MN, United States
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Wang H, Stahl F, Scheper T, Steffens M, Warnecke A, Zeilinger C. Microarray-based screening system identifies temperature-controlled activity of Connexin 26 that is distorted by mutations. Sci Rep 2019; 9:13543. [PMID: 31537823 PMCID: PMC6753059 DOI: 10.1038/s41598-019-49423-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Accepted: 08/24/2019] [Indexed: 11/09/2022] Open
Abstract
Here, we show that human Connexin 26 (hCx26 or Cx26WT) hemichannel opening rapidly enables the transport of small molecules when triggered by temperature and by compensation of the Ca2+ blockade with EDTA. Point mutations within Cx26 were analysed by a novel optical microarray-based Lucifer Yellow uptake assay or by two electrode voltage clamp (TEVC) on frog oocytes to monitor simultaneous activities of channel proteins. Point mutations L90P, F161S, R184P or K188N influenced the temperature-dependent activity drastically. Since several mutations blocked trafficking, the temperature-dependent activity of the recombinant synthesized and purified wild-type Cx26WT and Cx26K188N hemichannel was tested by liposome flux assay (LFA) and on a microarray-based Lucifer Yellow uptake assay under warm conditions (>30 °C). The data from TEVC measurements and dye flux experiments showed that the mutations gave no or only a weak activity at increased temperature (>30 °C). We conclude that the position K188 in the Cx26WT forms a temperature-sensitive salt bridge with E47 whereas the exchange to K188N destabilizes the network loop- gating filter, which was recently identified as a part of the flexible Ca2+ binding site. We assume that the temperature sensitivity of Cx26 is required to protect cells from uncontrolled release or uptake activities through Cx26 hemichannels.
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Affiliation(s)
- Hongling Wang
- Hannover Medical School, Department of Otorhinolaryngology, Head- and Neck-Surgery, Carl-Neuberg-Str. 1, 30625, Hannover, Germany.,Gottfried-Wilhelm-Leibniz University of Hannover, BMWZ (Zentrum für Biomolekulare Wirkstoffe), Schneiderberg 38, 30167, Hannover, Germany
| | - Frank Stahl
- Gottfried-Wilhelm-Leibniz University of Hannover, Institut für Technische Chemie/BMWZ (Zentrum für Biomolekulare Wirkstoffe), Callinstr. 5, 30167, Hannover, Germany.,Gottfried-Wilhelm-Leibniz University of Hannover, BMWZ (Zentrum für Biomolekulare Wirkstoffe), Schneiderberg 38, 30167, Hannover, Germany
| | - Thomas Scheper
- Gottfried-Wilhelm-Leibniz University of Hannover, Institut für Technische Chemie/BMWZ (Zentrum für Biomolekulare Wirkstoffe), Callinstr. 5, 30167, Hannover, Germany.,Gottfried-Wilhelm-Leibniz University of Hannover, BMWZ (Zentrum für Biomolekulare Wirkstoffe), Schneiderberg 38, 30167, Hannover, Germany
| | - Melanie Steffens
- Hannover Medical School, Department of Otorhinolaryngology, Head- and Neck-Surgery, Carl-Neuberg-Str. 1, 30625, Hannover, Germany
| | - Athanasia Warnecke
- Hannover Medical School, Department of Otorhinolaryngology, Head- and Neck-Surgery, Carl-Neuberg-Str. 1, 30625, Hannover, Germany.,Cluster of Excellence EXC1077 "Hearing4all", German Research Foundation (DFG; "Deutsche Forschungsgemeinschaft"), Hannover, Germany
| | - Carsten Zeilinger
- Gottfried-Wilhelm-Leibniz University of Hannover, BMWZ (Zentrum für Biomolekulare Wirkstoffe), Schneiderberg 38, 30167, Hannover, Germany.
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Gouveia DN, Guimarães AG, Santos WBDR, Quintans-Júnior LJ. Natural products as a perspective for cancer pain management: A systematic review. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2019; 58:152766. [PMID: 31005719 DOI: 10.1016/j.phymed.2018.11.026] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Revised: 11/14/2018] [Accepted: 11/17/2018] [Indexed: 06/09/2023]
Abstract
BACKGROUND Cancer is the leading cause of death in the world and one of the main symptoms affecting these individuals is chronic pain, which must be evaluated and treated in its various components. Several drugs are currently used, but beyond the high cost, they have harmful side effects to patients or are transitorily effective. Ergo, there is a need to look for new options for cancer pain relief. Natural products (NPs) present themselves as strong candidates for the development of new drugs for the treatment of chronic pain, such as cancer pain. PURPOSE This systematic review aimed to summarize current knowledge about the analgesic profile of NPs in cancer pain. METHODS The search included PubMed, Scopus and Web of Science (from inception to June 2018) sought to summarize the articles studying new proposals with NPs for the management of oncological pain. Two independent reviewers extracted data on study characteristics, methods and outcomes. RESULTS After an extensive survey, 21 articles were selected, which described the analgesic potential of 15 natural compounds to relieve cancer pain. After analyzing the data, it can be suggested that these NPs, which have targets in central and peripheral mechanisms, are interesting candidates for the treatment of cancer pain for addressing different pharmacological mechanisms (even innovative), but ensuring the safety of these compounds is still a challenge. Likewise, the cannabinoids compounds leave the front as the most promising compounds for direct applicability due to the clinical studies that have already been developed and the background already established about these effects on chronic pain. CONCLUSION Regarding these findings, it can be concluded that the variability of possible biological sites of action is strategic for new perspectives in the development of therapeutic proposals different from those available in the current market.
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Affiliation(s)
- Daniele Nascimento Gouveia
- Departamento de Fisiologia, Laboratório de Neurociências e Ensaios Farmacológicos (LANEF). Universidade Federal de Sergipe, São Cristovão, Sergipe, Brazil
| | - Adriana Gibara Guimarães
- Departamento de Educação em Saúde, Universidade Federal de Sergipe, Av. Governador Marcelo Déda, 13, Lagarto, Sergipe, Brazil.
| | - Wagner Barbosa da Rocha Santos
- Departamento de Fisiologia, Laboratório de Neurociências e Ensaios Farmacológicos (LANEF). Universidade Federal de Sergipe, São Cristovão, Sergipe, Brazil
| | - Lucindo José Quintans-Júnior
- Departamento de Fisiologia, Laboratório de Neurociências e Ensaios Farmacológicos (LANEF). Universidade Federal de Sergipe, São Cristovão, Sergipe, Brazil
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Abstract
The trigeminal sensory nerve fiber branches supply afferent information from the skin and mucous membranes of the face and head and the oral cavity regarding information on temperature, touch, and pain. Under normal conditions, the trigeminal nerve serves to provide important information from nerve fibers and tissues using specialized receptors sensitive for irritant and painful stimuli. The current scientific consensus indicates that nerve endings responsible for chemical and thermal sensitivity of the skin and mucous membranes are the same nerves responsible for nociception. This "chemesthetic sense" allows many vertebrates to detect chemical agonists that induce sensations such as touch, burning, stinging, tingling, or changes in temperature. Research has been under way for many years to determine how exposure of the oral and/or nasal cavity to compounds that elicit pungent or irritant sensations can produce these sensations. In addition, these chemicals can alter other sensory information such as taste and smell to affect the flavor of foods and beverages. We now know that these 'chemesthetic molecules' are agonists of molecular receptors, which exist on primary afferent nerve fibers that innervate the orofacial area. However, under pathophysiologic conditions, over- or underexpression or activity of these receptors may lead to painful orotrigeminal syndromes. Some of these individual receptors are discussed in detail, including transient receptor potential channels and acid sensing ion channels, among others.
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Affiliation(s)
- Amanda H Klein
- Department of Pharmacy Practice and Pharmaceutical Sciences, University of Minnesota, Duluth, MN, United States. //
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Li N, Sun J, Guo S, Liu Y, Wang C, Zhu C, Zhang X. Phenotypic and genotypic features of a pair of Chinese identical twins with congenital insensitivity to pain and anhidrosis: A case report. Medicine (Baltimore) 2018; 97:e13209. [PMID: 30461622 PMCID: PMC6392968 DOI: 10.1097/md.0000000000013209] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
RATIONALE Congenital insensitivity to pain with anhidrosis (CIPA) is a rare autosomal recessive genetic disorder characterized by insensitivity to noxious stimulus and the absence of sweating. Fractures and joint destruction are common complications, but detailed studies on mineral and skeletal homeostasis are not available. Mental retardation is often reported, but detailed observations during childhood are lacking. PATIENT CONCERNS A pair of 46-month-old Chinese identical twin brothers was presented at our hospital. The brothers had the typical manifestations of insensitivity to noxious stimulus, inability to sweat, and recurrent episodes of unexplained fever. Fortunately, they did not present common complications such as self-mutilation, trauma, bruise, and repeated bone fractures. DIAGNOSES Two novel compound heterozygous variants of NTRK1 (c.632T > A and c.1253_1254delTC) were identified. INTERVENTIONS The patients were subjected to routine and specialist clinical examinations. Daily care and symptomatic treatment were given. OUTCOME X-ray films of proband 2 showed a fracture in the first metatarsal. Decreased bone mineral density (BMD) and mild-to-moderate retardation of the Gesell developmental schedules (GDS), especially language and adaptability, were observed. Evaluation results for BMD and GDS in proband 2 were worse than those in his brother. LESSONS The current findings expand our knowledge about the spectrum of phenotypic and genotypic features of CIPA, which will help facilitate future genotype-phenotype association studies. Daily care by parents promotes favorable outcomes in patients.
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Baldisserotto B, Parodi TV, Stevens ED. Lack of postexposure analgesic efficacy of low concentrations of eugenol in zebrafish. Vet Anaesth Analg 2017; 45:48-56. [PMID: 29239756 DOI: 10.1016/j.vaa.2017.08.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Revised: 08/25/2017] [Accepted: 08/29/2017] [Indexed: 12/22/2022]
Abstract
OBJECTIVE To test the postexposure analgesic efficacy of low doses of eugenol in zebrafish. STUDY DESIGN Prospective experimental study. ANIMALS A total of 76 large adult zebrafish (Danio rerio). METHODS Fish swimming behavior (median velocity, freeze time, high-speed swimming and distance moved in the vertical direction) was recorded in a 1.6 L video arena before and after exposure to eugenol (0, 1, 2, 5, 10 and 20 mg L-1). In a second experiment, fish were anesthetized with 2-phenoxy-ethanol and treated with an injection of 5% acetic acid (noxious stimulus), and then exposed to 0, 1, 2 and 5 mg L-1 eugenol. The fish swimming behavior was also recorded. RESULTS The higher doses (10 and 20 mg L-1) reduced the median velocity, high-speed swimming and distance moved in the vertical direction, and increased the freeze time. Zebrafish behavior was not altered by eugenol (1, 2 and 5 mg L-1) after noxious stimulation. CONCLUSIONS AND CLINICAL RELEVANCE The change in the behavior of zebrafish associated with a noxious stimulus can be monitored and is a good model for studying analgesia in fish. Eugenol (10 and 20 mg L-1) induced zebrafish sedation. The response after a noxious stimulus was not affected by postexposure to lower doses, and thus we cannot recommend its use as an analgesic.
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Affiliation(s)
- Bernardo Baldisserotto
- Departamento de Fisiologia e Farmacologia, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
| | - Thaylise V Parodi
- Departamento de Fisiologia e Farmacologia, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
| | - E Don Stevens
- Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, PEI, Canada
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Pace MC, Passavanti MB, De Nardis L, Bosco F, Sansone P, Pota V, Barbarisi M, Palagiano A, Iannotti FA, Panza E, Aurilio C. Nociceptor plasticity: A closer look. J Cell Physiol 2017; 233:2824-2838. [PMID: 28488779 DOI: 10.1002/jcp.25993] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2016] [Revised: 04/20/2017] [Accepted: 05/09/2017] [Indexed: 12/17/2022]
Abstract
Nociceptors are receptors specifically involved in detecting a tissue damage and transducing it in an electrical signal. Nociceptor activation provoked by any kind of acute lesion is related to the release of several mediators of inflammation, within the framework of a process defined as "peripheral sensitization." This results in an exaggerated response to the painful stimulus, clinically defined as "primary hyperalgesia." The concept of "neuroplasticity" may explain the adaptive mechanisms carried out by the Nervous System in relation to a "harmful" damage; also, neuroplasticity mechanisms are also fundamental for rehabilitative intervention protocols. Here we review several studies that addressed the role of different receptors and ionic channels discovered on nociceptor surface and their role in pain perception. The changes in expression, distribution, and functioning of receptors and ionic channels are thought to be a part of the neuroplasticity property, through which the Nervous System constantly adapts to external stimuli. Moreover, some of the reviewed mediators are also been associated to "central sensitization," a process that results in pain chronicization when the painful stimulation is particularly prolonged or intense, and lastly leads to the memorization of the uncomfortable painful perception.
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Affiliation(s)
- Maria Caterina Pace
- Department of Anaesthesiological, Surgical and Emergency Sciences, Second University of Naples, Naples, Italy
| | - Maria Beatrice Passavanti
- Department of Anaesthesiological, Surgical and Emergency Sciences, Second University of Naples, Naples, Italy
| | - Lorenzo De Nardis
- Department of Anaesthesiological, Surgical and Emergency Sciences, Second University of Naples, Naples, Italy
| | - Fabio Bosco
- Department of Anaesthesiological, Surgical and Emergency Sciences, Second University of Naples, Naples, Italy
| | - Pasquale Sansone
- Department of Anaesthesiological, Surgical and Emergency Sciences, Second University of Naples, Naples, Italy
| | - Vincenzo Pota
- Department of Anaesthesiological, Surgical and Emergency Sciences, Second University of Naples, Naples, Italy
| | - Manlio Barbarisi
- Laboratory of Applied Biotechnology, Department of Anaesthesiological, Surgical and Emergency Sciences, Second University of Naples, Naples, Italy
| | - Antonio Palagiano
- Department of Women, Child and General and Specialized Surgery, Second University of Naples, Naples, Italy
| | - Fabio Arturo Iannotti
- Institute of Biomolecular Chemistry (ICB) Research National Council (CNR), Pozzuoli, Italy
| | - Elisabetta Panza
- Department of Pharmacy, University of Naples Federico II, Naples, Italy
| | - Caterina Aurilio
- Department of Anaesthesiological, Surgical and Emergency Sciences, Second University of Naples, Naples, Italy
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McGaraughty S, Chu KL, Xu J, Leys L, Radek RJ, Dart MJ, Gomtsyan A, Schmidt RG, Kym PR, Brederson JD. TRPV3 modulates nociceptive signaling through peripheral and supraspinal sites in rats. J Neurophysiol 2017; 118:904-916. [PMID: 28468993 DOI: 10.1152/jn.00104.2017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 04/14/2017] [Accepted: 04/26/2017] [Indexed: 11/22/2022] Open
Abstract
TRPV3 is a nonselective cation channel activated by temperatures above 33°C and is reported to be localized in keratinocytes and nervous tissue. To investigate a role for TRPV3 in pain modulation, we conducted a series of in vivo electrophysiological studies on spinal and brain nociceptive neurons. Structurally diverse TRPV3 receptor antagonists reduced responses of spinal wide dynamic range (WDR) neurons to low-intensity mechanical stimulation in neuropathic rats, but only CNS-penetrant antagonists decreased elevated spontaneous firing. Injections of an antagonist into the neuronal receptive field, into the L5 dorsal root ganglion, or intracerebroventricularly (ICV) attenuated the evoked firing, but only ICV injections reduced spontaneous activity. Intraspinal injections did not affect either. Spinal transection blocked the effect on spontaneous but not evoked firing after systemic delivery of a TRPV3 antagonist. Systemic administration of an antagonist to neuropathic rats also impacted the firing of On- and Off-cells in the rostral ventromedial medulla in a manner consistent with dampening nociceptive signaling. An assessment of nonevoked "pain," an EEG-measured pain-induced sleep disturbance induced by hind paw injections of CFA, was also improved with CNS-penetrant TRPV3 antagonists but not by an antagonist with poor CNS penetration. Antagonism of TRPV3 receptors modulates activity of key classes of neurons in the pain pathway in a manner consistent with limiting pathological nociceptive signaling and was mediated by receptors in the periphery and brain. Blockade of TRPV3 receptors is likely an effective means to alleviate mechanical allodynia and nonevoked pain. However, the latter will only be obtained by blocking supraspinal TRPV3 receptors.NEW & NOTEWORTHY Recent studies have linked TRPV3 to pain modulation, and much of this work has focused on its role in the skin-primary afferent interface. In this electrophysiological study, we demonstrate that receptor antagonists modulate evoked signals through peripheral mechanisms but blockade of supraspinal TRPV3 receptors contributes to dampening both evoked and nonevoked "pain" through descending modulation. Thus, the full therapeutic potential of TRPV3 antagonists may only be realized with the ability to access receptors in the brain.
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Affiliation(s)
| | | | - Jun Xu
- Neuroscience Research, AbbVie, North Chicago, Illinois
| | - Laura Leys
- Neuroscience Research, AbbVie, North Chicago, Illinois
| | | | | | | | | | - Philip R Kym
- Neuroscience Research, AbbVie, North Chicago, Illinois
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Wang G, Wang K. The Ca2+-Permeable Cation Transient Receptor Potential TRPV3 Channel: An Emerging Pivotal Target for Itch and Skin Diseases. Mol Pharmacol 2017; 92:193-200. [DOI: 10.1124/mol.116.107946] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Accepted: 03/31/2017] [Indexed: 12/15/2022] Open
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