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Jeon S, Baik J, Kim J, Lee J, Do W, Kim E, Lee HJ, Kim H. Intrathecal dexmedetomidine attenuates mechanical allodynia through the downregulation of brain-derived neurotrophic factor in a mild traumatic brain injury rat model. Korean J Anesthesiol 2023; 76:56-66. [PMID: 35760392 PMCID: PMC9902181 DOI: 10.4097/kja.22209] [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: 04/08/2022] [Accepted: 06/23/2022] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND This study evaluated the effects of dexmedetomidine and propofol on brain-derived neurotrophic factor level in the cerebrospinal fluid (c-BDNF) and mechanical allodynia in a mild traumatic brain injury (TBI) rat model. METHODS After fixing the rat's skull on a stereotactic frame under general anesthesia, craniotomy was performed. After impact, 10 µl of drug was injected into the cisterna magna (group S: sham, group D: dexmedetomidine 5 μg/kg, group P: propofol 500 μg/kg, and group T: untreated TBI). The 50% mechanical withdrawal threshold (50% MWT) and c-BDNF level were measured on postoperative days (PODs) 1, 7, and 14. RESULTS The 50% MWT measured on PODs 1, 7, and 14 was lower and the c-BDNF level on POD 1 was higher in group T than in group S. In group D, the c-BDNF level on POD 1 was lower than that in group T and was comparable with that in group S during the whole study period. The 50% MWT of group D was higher than that of group T throughout the postoperative period. In group P, there were no significant differences in the 50% MWT during the entire postoperative period compared with group T; the c-BDNF level was higher than that in group T on POD 1. CONCLUSIONS Intrathecal administration of dexmedetomidine may attenuate TBI-induced mechanical allodynia for up to two weeks post-injury through immediate suppression of c-BDNF in mild TBI rats. The inhibition of c-BDNF expression in the acute phase reduced the occurrence of TBI-induced chronic neuropathic pain.
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Affiliation(s)
- Soeun Jeon
- Department of Anesthesiology and Pain Medicine, School of Dentistry, Institute for Translational Research in Dentistry, Kyungpook National University, Daegu, Korea
| | - Jiseok Baik
- Department of Anesthesia and Pain Medicine, Biomedical Research Institute, Pusan National University Hospital, Busan, Korea,Pusan National University School of Medicine, Busan, Korea,Corresponding author: Jiseok Baik, M.D., Ph.D., Department of Anesthesia and Pain Medicine, Pusan National University School of Medicine, Biomedical Research Institute, Pusan National University Hospital, 179 Gudeok-ro, Seo-gu, Busan 49241, KoreaTel: +82-51-240-7399Fax: +82-51-242-7466
| | - Jisu Kim
- Department of Anesthesia and Pain Medicine, Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Jiyoon Lee
- Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Wangseok Do
- Department of Anesthesia and Pain Medicine, Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
| | - Eunsoo Kim
- Department of Anesthesia and Pain Medicine, Biomedical Research Institute, Pusan National University Hospital, Busan, Korea,Pusan National University School of Medicine, Busan, Korea
| | - Hyeon Jeong Lee
- Department of Anesthesia and Pain Medicine, Biomedical Research Institute, Pusan National University Hospital, Busan, Korea,Pusan National University School of Medicine, Busan, Korea
| | - Haekyu Kim
- Department of Anesthesia and Pain Medicine, Biomedical Research Institute, Pusan National University Hospital, Busan, Korea,Pusan National University School of Medicine, Busan, Korea
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McDonough KE, Hammond R, Wang J, Tierney J, Hankerd K, Chung JM, La JH. Spinal GABAergic disinhibition allows microglial activation mediating the development of nociplastic pain in male mice. Brain Behav Immun 2023; 107:215-224. [PMID: 36273650 PMCID: PMC9855286 DOI: 10.1016/j.bbi.2022.10.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 10/14/2022] [Accepted: 10/15/2022] [Indexed: 11/05/2022] Open
Abstract
Previously we developed a murine model in which postinjury stimulation of an injured area triggers a transition to a nociplastic pain state manifesting as persistent mechanical hypersensitivity outside of the previously injured area. This hypersensitivity was maintained by sex-specific mechanisms; specifically, activated spinal microglia maintained the hypersensitivity only in males. Here we investigated whether spinal microglia drive the transition from acute injury-induced pain to nociplastic pain in males, and if so, how they are activated by normally innocuous stimulation after peripheral injury. Using intraplantar capsaicin injection as an acute peripheral injury and vibration of the injured paw as postinjury stimulation, we found that inhibition of spinal microglia prevents the vibration-induced transition to a nociplastic pain state. The transition was mediated by the ATP-P2X4 pathway, but not BDNF-TrkB signaling. Intrathecally injected GABA receptor agonists after intraplantar capsaicin injection prevented the vibration-induced transition to a nociplastic pain state. Conversely, in the absence of intraplantar capsaicin injection, intrathecally injected GABA receptor antagonists allowed the vibration stimulation of a normal paw to trigger the transition to a spinal microglia-mediated nociplastic pain state only in males. At the spinal level, TNF-α, IL-1β, and IL-6, but not prostaglandins, contributed to the maintenance of the nociplastic pain state in males. These results demonstrate that in males, the transition from acute injury-induced pain to nociplastic pain is driven by spinal microglia causing neuroinflammation and that peripheral injury-induced spinal GABAergic disinhibition is pivotal for normally innocuous stimulation to activate spinal microglia.
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Affiliation(s)
- Kathleen E McDonough
- Department of Neurobiology, University of Texas Medical Branch, 301 University Blvd, Galveston, TX 77555, United States
| | - Regan Hammond
- Department of Neurobiology, University of Texas Medical Branch, 301 University Blvd, Galveston, TX 77555, United States
| | - Jigong Wang
- Department of Neurobiology, University of Texas Medical Branch, 301 University Blvd, Galveston, TX 77555, United States
| | - Jessica Tierney
- Department of Neurobiology, University of Texas Medical Branch, 301 University Blvd, Galveston, TX 77555, United States
| | - Kali Hankerd
- Department of Neurobiology, University of Texas Medical Branch, 301 University Blvd, Galveston, TX 77555, United States
| | - Jin Mo Chung
- Department of Neurobiology, University of Texas Medical Branch, 301 University Blvd, Galveston, TX 77555, United States
| | - Jun-Ho La
- Department of Neurobiology, University of Texas Medical Branch, 301 University Blvd, Galveston, TX 77555, United States.
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Phạm TL, Noh C, Neupane C, Sharma R, Shin HJ, Park KD, Lee CJ, Kim HW, Lee SY, Park JB. MAO-B Inhibitor, KDS2010, Alleviates Spinal Nerve Ligation-induced Neuropathic Pain in Rats Through Competitively Blocking the BDNF/TrkB/NR2B Signaling. THE JOURNAL OF PAIN 2022; 23:2092-2109. [PMID: 35940543 DOI: 10.1016/j.jpain.2022.07.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 07/05/2022] [Accepted: 07/20/2022] [Indexed: 01/04/2023]
Abstract
MAO-B inhibitors have been implicated to reverse neuropathic pain behaviors. Our previous study has demonstrated that KDS2010 (KDS), a newly developed reversible MAO-B inhibitor, could attenuate Paclitaxel (PTX)-induced tactile hypersensitivity in mice through suppressing reactive oxidant species (ROS)-decreased inhibitory GABA synaptic transmission in the spinal cord. In this study, we evaluated the analgesic effect of KDS under a new approach, in which KDS acts on dorsal horn sensory neurons to reduce excitatory transmission. Oral administration of KDS effectively enhanced mechanical thresholds in the spinal nerve ligation (SNL) induced neuropathic pain in rats. Moreover, we discovered that although treatment with KDS increased brain-derived neurotrophic factor (BDNF) levels, KDS inhibited Tropomyosin receptor kinase B (TrkB) receptor activation, suppressing increased p-NR2B-induced hyperexcitability in spinal dorsal horn sensory neurons after nerve injury. In addition, KDS showed its anti-inflammatory effects by reducing microgliosis and astrogliosis and the activation of MAPK and NF-ᴋB inflammatory pathways in these glial cells. The levels of ROS production in the spinal cords after the SNL procedure were also decreased with KDS treatment. Taken together, our results suggest that KDS may represent a promising therapeutic option for treating neuropathic pain. PERSPECTIVE: Our study provides evidence suggesting the mechanisms by which KDS, a novel MAO-B inhibitor, can be effective in pain relief. KDS, by targeting multiple mechanisms involved in BDNF/TrkB/NR2B-related excitatory transmission and neuroinflammation, may represent the next future of pain medicine.
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Affiliation(s)
- Thuỳ Linh Phạm
- Department of Medical Science, Graduate School, Chungnam National University, Daejeon 35015, Republic of Korea; Department of Physiology, College of Medicine and Brain Research Institute, Chungnam National University, Daejeon 35015, Republic of Korea; Department of Histo-Pathology, Hai Phong University of Medicine & Pharmacy, Hai Phong 042-12, Vietnam
| | - Chan Noh
- Department of Anesthesiology and Pain Medicine, Chungnam National University Hospital, Daejeon 35015, Republic of Korea
| | - Chiranjivi Neupane
- Department of Medical Science, Graduate School, Chungnam National University, Daejeon 35015, Republic of Korea; Department of Physiology, College of Medicine and Brain Research Institute, Chungnam National University, Daejeon 35015, Republic of Korea; Laboratory of Veterinary Pharmacology, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul 08826, Republic of Korea
| | - Ramesh Sharma
- Department of Medical Science, Graduate School, Chungnam National University, Daejeon 35015, Republic of Korea; Department of Physiology, College of Medicine and Brain Research Institute, Chungnam National University, Daejeon 35015, Republic of Korea; Laboratory of Veterinary Pharmacology, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul 08826, Republic of Korea
| | - Hyun Jin Shin
- Department of Medical Science, Graduate School, Chungnam National University, Daejeon 35015, Republic of Korea; Department of Physiology, College of Medicine and Brain Research Institute, Chungnam National University, Daejeon 35015, Republic of Korea
| | - Ki Duk Park
- Convergence Research Center for Diagnosis, Treatment and Care System of Dementia, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - C Justin Lee
- Center for Cognition and Sociality, Institute for Basic Science, Daejeon 34126, Republic of Korea
| | - Hyun-Woo Kim
- Department of Medical Science, Graduate School, Chungnam National University, Daejeon 35015, Republic of Korea; Department of Physiology, College of Medicine and Brain Research Institute, Chungnam National University, Daejeon 35015, Republic of Korea
| | - So Yeong Lee
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul 08826, Republic of Korea
| | - Jin Bong Park
- Department of Medical Science, Graduate School, Chungnam National University, Daejeon 35015, Republic of Korea; Department of Physiology, College of Medicine and Brain Research Institute, Chungnam National University, Daejeon 35015, Republic of Korea; Laboratory of Veterinary Pharmacology, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National University, Seoul 08826, Republic of Korea.
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Naldan ME, Taghizadehghalehjoughi A. Remifentanil reduces glutamate toxicity in rat olfactory bulb neurons in culture. Braz J Anesthesiol 2021; 71:402-407. [PMID: 33895216 PMCID: PMC9373102 DOI: 10.1016/j.bjane.2021.04.003] [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: 05/18/2019] [Revised: 03/22/2021] [Accepted: 04/02/2021] [Indexed: 11/28/2022] Open
Abstract
Background Opioids are widely used as an analgesic drug in the surgical setting. Remifentanil is an ultra-short acting opioid with selective affinity to the mu (μ) receptor, and also exhibits GABA agonist effects. The aim of this study was study of the neurotoxic or neuroprotective effect of different doses of remifentanil in glutamate-induced toxicity in olfactory neuron cell culture. Materials and methods Olfactory neurons were obtained from newborn Sprague Dawley rat pups. Glutamate 10-5 mM was added to all culture dishes, except for the negative control group. Remifentanil was added at three different doses for 24 hours, after which evaluation was performed using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT), Total Antioxidant Capacity (TAC), Total Oxidant Status (TOS), and Annexin V. Results The highest and lowest viability values were obtained from the low and high remifentanil doses at approximately 91% and 75%, respectively. TAC and TOS were correlated with the MTT results. TAC, TOS and MTT most closely approximated to the sham group values in the remifentanil 0.02 mM group. Conclusions Our results suggest that remifentanil has the potential to reduce glutamate toxicity and to increase cell viability in cultured neuron from the rat olfactory bulb.
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Affiliation(s)
- Muhammet Emin Naldan
- Erzurum Regional Training and Research Hospital, Department of Anesthesiology and Reanimation, Erzurum, Turkey.
| | - Ali Taghizadehghalehjoughi
- Atatürk University, Faculty of Veterinary Science, Department of Pharmacology and Toxicology, Erzurum, Turkey
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Lipid nanoparticles-encapsulated brain-derived neurotrophic factor mRNA delivered through the round window niche in the cochleae of guinea pigs. Exp Brain Res 2020; 239:425-433. [PMID: 33215262 DOI: 10.1007/s00221-020-05970-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Accepted: 10/21/2020] [Indexed: 01/10/2023]
Abstract
The treatment of sensorineural hearing loss (SNHL) may be achieved via the application of a cochlear implant (CI) that allows the electrical stimulation of spiral ganglion neurons (SGNs). Nevertheless, the efficacy of CIs is limited by the degeneration of SGNs following SNHL. Although the application of exogenous neurotrophic factors has been reported to decrease SGN degeneration, non-invasive targeted drug delivery systems are required to achieve effective results. In this study, an SS-cleavable proton-activated lipid-like material [ssPalm; a neutral lipid nanoparticle (LNP)], was loaded with mRNA, and the efficacy of this material as a delivery system was investigated. Our results showed that LNPssPalm carrying brain-derived neurotrophic factor (BDNF) mRNA was suitable for the treatment of inner ear diseases, preventing the degeneration of SGNs. In conclusion, this modern nanotechnology-based bioconjugation system, LNPssPalm, is a potential non-invasive targeted therapy allowing the delivering biomaterials to specific structures within the inner ear for the treatment of SHNL.
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Chen W, Marvizón JC. A Src family kinase maintains latent sensitization in rats, a model of inflammatory and neuropathic pain. Brain Res 2020; 1746:146999. [PMID: 32579948 PMCID: PMC10866137 DOI: 10.1016/j.brainres.2020.146999] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 05/29/2020] [Accepted: 06/17/2020] [Indexed: 02/06/2023]
Abstract
Latent sensitization is a long-term model of chronic pain in which hyperalgesia is continuously suppressed by opioid receptors, as demonstrated by the induction of mechanical allodynia by opioid antagonists. Different intracellular signals may mediate the initiation, maintenance and expression of latent sensitization. Our criterion for the involvement of a signal in the maintenance of latent sensitization is that inhibitors should permanently eliminate the allodynia produced by an opioid antagonist. We hypothesized that Src family kinases (SFKs) maintain latent sensitization and tested this hypothesis by inducing latent sensitization in rats with complete Freund's adjuvant (CFA) or spared nerve injury. After measures of mechanical allodynia returned to baseline, vehicle or the SFK inhibitor PP2 were injected intrathecally. The opioid antagonist naltrexone injected intrathecally 15 min later produced allodynia in control rats but not in rats injected with PP2. Vehicle or PP2 were injected daily for two more days and naltrexone was injected five days later. Again, naltrexone induced allodynia in the control rats but not in the rats injected with PP2. Results were similar when latent sensitization was induced with CFA or spared nerve injury. We concluded that an SFK, likely Fyn, maintains latent sensitization induced by inflammation or nerve injury.
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Affiliation(s)
- Wenling Chen
- Veteran Affairs Greater Los Angeles Healthcare System, Los Angeles, CA 90073, United States; Vatche and Tamar Manoukian Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, CA 90095, United States
| | - Juan Carlos Marvizón
- Veteran Affairs Greater Los Angeles Healthcare System, Los Angeles, CA 90073, United States; Vatche and Tamar Manoukian Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, CA 90095, United States.
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Ma Z, Liu K, Li XR, Wang C, Liu C, Yan DY, Deng Y, Liu W, Xu B. Alpha-synuclein is involved in manganese-induced spatial memory and synaptic plasticity impairments via TrkB/Akt/Fyn-mediated phosphorylation of NMDA receptors. Cell Death Dis 2020; 11:834. [PMID: 33033239 PMCID: PMC7545185 DOI: 10.1038/s41419-020-03051-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Revised: 09/24/2020] [Accepted: 09/28/2020] [Indexed: 02/06/2023]
Abstract
Manganese (Mn) overexposure produces long-term cognitive deficits and reduces brain-derived neurotrophic factor (BDNF) in the hippocampus. However, it remains elusive whether Mn-dependent enhanced alpha-synuclein (α-Syn) expression, suggesting a multifaceted mode of neuronal toxicities, accounts for interference with BDNF/TrkB signaling. In this study, we used C57BL/6J WT and α-Syn knockout (KO) mice to establish a model of manganism and found that Mn-induced impairments in spatial memory and synaptic plasticity were related to the α-Syn protein. In addition, consistent with the long-term potentiation (LTP) impairments that were observed, α-Syn KO relieved Mn-induced degradation of PSD95, phosphorylated CaMKIIα, and downregulated SynGAP protein levels. We transfected HT22 cells with lentivirus (LV)-α-Syn shRNA, followed by BDNF and Mn stimulation. In vitro experiments indicated that α-Syn selectively interacted with TrkB receptors and inhibited BDNF/TrkB signaling, leading to phosphorylation and downregulation of GluN2B. The binding of α-Syn to TrkB and Fyn-mediated phosphorylation of GluN2B were negatively regulated by BDNF. Together, these findings indicate that Mn-dependent enhanced α-Syn expression contributes to further exacerbate BDNF protein-level reduction and to inhibit TrkB/Akt/Fyn signaling, thereby disturbing Fyn-mediated phosphorylation of the NMDA receptor GluN2B subunit at tyrosine. In KO α-Syn mice treated with Mn, spatial memory and LTP impairments were less pronounced than in WT mice. However, the same robust neuronal death was observed as a result of Mn-induced neurotoxicity.
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Affiliation(s)
- Zhuo Ma
- Department of Environmental Health, School of Public Health, China Medical University, No. 77 Puhe Road, Shenyang North New Area, 110122, Shenyang, Liaoning Province, People's Republic of China
| | - Kuan Liu
- Department of Environmental Health, School of Public Health, China Medical University, No. 77 Puhe Road, Shenyang North New Area, 110122, Shenyang, Liaoning Province, People's Republic of China
| | - Xin-Ru Li
- Department of Environmental Health, School of Public Health, China Medical University, No. 77 Puhe Road, Shenyang North New Area, 110122, Shenyang, Liaoning Province, People's Republic of China
| | - Can Wang
- Department of Environmental Health, School of Public Health, China Medical University, No. 77 Puhe Road, Shenyang North New Area, 110122, Shenyang, Liaoning Province, People's Republic of China
| | - Chang Liu
- Department of Environmental Health, School of Public Health, China Medical University, No. 77 Puhe Road, Shenyang North New Area, 110122, Shenyang, Liaoning Province, People's Republic of China
| | - Dong-Ying Yan
- Department of Environmental Health, School of Public Health, China Medical University, No. 77 Puhe Road, Shenyang North New Area, 110122, Shenyang, Liaoning Province, People's Republic of China
| | - Yu Deng
- Department of Environmental Health, School of Public Health, China Medical University, No. 77 Puhe Road, Shenyang North New Area, 110122, Shenyang, Liaoning Province, People's Republic of China
| | - Wei Liu
- Department of Environmental Health, School of Public Health, China Medical University, No. 77 Puhe Road, Shenyang North New Area, 110122, Shenyang, Liaoning Province, People's Republic of China
| | - Bin Xu
- Department of Environmental Health, School of Public Health, China Medical University, No. 77 Puhe Road, Shenyang North New Area, 110122, Shenyang, Liaoning Province, People's Republic of China.
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A new method for vibration-based neurophenotyping of zebrafish. J Neurosci Methods 2020; 333:108563. [DOI: 10.1016/j.jneumeth.2019.108563] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Revised: 12/12/2019] [Accepted: 12/17/2019] [Indexed: 02/08/2023]
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Fan F, Tang Y, Dai H, Cao Y, Sun P, Chen Y, Chen A, Lin C. Blockade of BDNF signalling attenuates chronic visceral hypersensitivity in an IBS-like rat model. Eur J Pain 2020; 24:839-850. [PMID: 31976585 PMCID: PMC7154558 DOI: 10.1002/ejp.1534] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2019] [Revised: 01/13/2020] [Accepted: 01/14/2020] [Indexed: 12/14/2022]
Abstract
Background Irritable bowel syndrome (IBS) is a common functional disease characterized by chronic abdominal pain and changes in bowel movements. Effective therapy for visceral hypersensitivity in IBS patients remains challenging. This study investigated the roles of brain‐derived neurotrophic factor (BDNF) and tyrosine kinase receptor B (TrkB) and the effect of ANA‐12 (a selective antagonist of TrkB) on chronic visceral hypersensitivity in an IBS‐like rat model. Methods An IBS‐like rat model was established through neonatal maternal separation (NMS), and visceral hypersensitivity was assessed by electromyographic (EMG) responses of the abdominal external oblique muscles to colorectal distention (CRD). Different doses of ANA‐12 were injected intrathecally to investigate the effect of that drug on visceral hypersensitivity, and the open field test was performed to determine whether ANA‐12 had side effects on movement. Thoracolumbar spinal BDNF, TrkB receptor and Protein kinase Mζ (PKMζ) expression were measured to investigate their roles in chronic visceral hypersensitivity. Whole‐cell recordings were made from thoracolumbar superficial dorsal horn (SDH) neurons of lamina II. Results The expression of BDNF and TrkB was enhanced in the thoracolumbar spinal cord of the NMS animals. ANA‐12 attenuated visceral hypersensitivity without side effects on motricity in NMS rats. PKMζ expression significantly decreased after the administration of ANA‐12. The frequency of spontaneous excitatory postsynaptic currents (sEPSCs) increased in the thoracolumbar SDH neurons of lamina II in NMS rats. The amplitude and frequency of sEPSCs were reduced after perfusion with ANA‐12 in NMS rats. Conclusions Neonatal maternal separation caused visceral hypersensitivity and increased synaptic activity by activating BDNF‐TrkB‐PKMζ signalling in the thoracolumbar spinal cord of adult rats. PKMζ was able to potentiate AMPA receptor (AMPAR)‐mediated sEPSCs in NMS rats. ANA‐12 attenuated visceral hypersensitivity and synaptic activity by blocking BDNF/TrkB signalling in NMS rats. Significance ANA‐12 attenuates visceral hypersensitivity via BDNF‐TrkB‐PKMζ signalling and reduces synaptic activity through AMPARs in NMS rats. This knowledge suggests that ANA‐12 could represent an interesting novel therapeutic medicine for chronic visceral hypersensitivity.
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Affiliation(s)
- Fei Fan
- School of basic Medical Sciences, Laboratory of Pain Research, Fujian Medical University, Fuzhou, China.,Fujian Provincial Key Laboratory of Brain Aging and Neurodegenerative Diseases, Fujian Medical University, Fuzhou, China
| | - Ying Tang
- School of basic Medical Sciences, Laboratory of Pain Research, Fujian Medical University, Fuzhou, China
| | - Hengfen Dai
- School of basic Medical Sciences, Laboratory of Pain Research, Fujian Medical University, Fuzhou, China.,Affiliated Fuzhou First Hospital of Fujian Medical University, Fuzhou, China
| | - Yang Cao
- School of basic Medical Sciences, Laboratory of Pain Research, Fujian Medical University, Fuzhou, China
| | - Pei Sun
- School of basic Medical Sciences, Laboratory of Pain Research, Fujian Medical University, Fuzhou, China
| | - Yu Chen
- School of basic Medical Sciences, Laboratory of Pain Research, Fujian Medical University, Fuzhou, China
| | - Aiqin Chen
- School of basic Medical Sciences, Laboratory of Pain Research, Fujian Medical University, Fuzhou, China
| | - Chun Lin
- School of basic Medical Sciences, Laboratory of Pain Research, Fujian Medical University, Fuzhou, China
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Ding H, Chen J, Su M, Lin Z, Zhan H, Yang F, Li W, Xie J, Huang Y, Liu X, Liu B, Zhou X. BDNF promotes activation of astrocytes and microglia contributing to neuroinflammation and mechanical allodynia in cyclophosphamide-induced cystitis. J Neuroinflammation 2020; 17:19. [PMID: 31931832 PMCID: PMC6958761 DOI: 10.1186/s12974-020-1704-0] [Citation(s) in RCA: 78] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Accepted: 01/07/2020] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Patients with interstitial cystitis/bladder pain syndrome (IC/BPS) often grieve over a low quality of life brought about by chronic pain. In our previous studies, we determined that neuroinflammation of the spinal dorsal horn (SDH) was associated with mechanisms of interstitial cystitis. Moreover, it has been shown that brain-derived neurotrophic factor (BDNF) participates in the regulation of neuroinflammation and pathological pain through BDNF-TrkB signaling; however, whether it plays a role in cyclophosphamide (CYP)-induced cystitis remains unclear. This study aimed to confirm whether BDNF-TrkB signaling modulates neuroinflammation and mechanical allodynia in CYP-induced cystitis and determine how it occurs. METHODS Systemic intraperitoneal injection of CYP was performed to establish a rat cystitis model. BDNF-TrkB signaling was modulated by intraperitoneal injection of the TrkB receptor antagonist, ANA-12, or intrathecal injection of exogenous BDNF. Mechanical allodynia in the suprapubic region was assessed using the von Frey filaments test. The expression of BDNF, TrkB, p-TrkB, Iba1, GFAP, p-p38, p-JNK, IL-1β, and TNF-α in the L6-S1 SDH was measured by Western blotting and immunofluorescence analysis. RESULTS BDNF-TrkB signaling was upregulated significantly in the SDH after CYP was injected. Similarly, the expressions of Iba1, GFAP, p-p38, p-JNK, IL-1β, and TNF-α in the SDH were all upregulated. Treatment with ANA-12 could attenuate mechanical allodynia, restrain activation of astrocytes and microglia and alleviate neuroinflammation. Besides, the intrathecal injection of exogenous BDNF further decreased the mechanical withdrawal threshold, promoted activation of astrocytes and microglia, and increased the release of TNF-α and IL-1β in the SDH of our CYP-induced cystitis model. CONCLUSIONS In our CYP-induced cystitis model, BDNF promoted the activation of astrocytes and microglia to release TNF-α and IL-1β, aggravating neuroinflammation and leading to mechanical allodynia through BDNF-TrkB-p38/JNK signaling.
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Affiliation(s)
- Honglu Ding
- Department of Urology, the Third Affiliated hospital of Sun Yat-Sen University, 600 Tianhe Rd, Guangzhou, 510630, China
| | - Jialiang Chen
- Department of Urology, the Third Affiliated hospital of Sun Yat-Sen University, 600 Tianhe Rd, Guangzhou, 510630, China
| | - Minzhi Su
- Department of Rehabilitation, The Third Affiliated Hospital and Lingnan Hospital of the Sun Yat-Sen University, 2693 Kaichuang Rd, Guangzhou, 510700, China
| | - Zhijun Lin
- Department of Urology, the Third Affiliated hospital of Sun Yat-Sen University, 600 Tianhe Rd, Guangzhou, 510630, China
| | - Hailun Zhan
- Department of Urology, the Third Affiliated hospital of Sun Yat-Sen University, 600 Tianhe Rd, Guangzhou, 510630, China
| | - Fei Yang
- Department of Urology, the Third Affiliated hospital of Sun Yat-Sen University, 600 Tianhe Rd, Guangzhou, 510630, China
| | - Wenbiao Li
- Department of Urology, the Third Affiliated hospital of Sun Yat-Sen University, 600 Tianhe Rd, Guangzhou, 510630, China
| | - Juncong Xie
- Department of Urology, the Third Affiliated hospital of Sun Yat-Sen University, 600 Tianhe Rd, Guangzhou, 510630, China
| | - Yong Huang
- Department of Urology, the Third Affiliated hospital of Sun Yat-Sen University, 600 Tianhe Rd, Guangzhou, 510630, China
| | - Xianguo Liu
- Pain Research Center and Department of Physiology, Zhongshan School of Medicine of Sun Yat-sen University, 74 Zhongshan Rd. 2, Guangzhou, 510080, China.,Guangdong Provincial Key Laboratory of Brain Function and Disease, 74 Zhongshan Rd. 2, Guangzhou, 510080, China
| | - Bolong Liu
- Department of Urology, the Third Affiliated hospital of Sun Yat-Sen University, 600 Tianhe Rd, Guangzhou, 510630, China.
| | - Xiangfu Zhou
- Department of Urology, the Third Affiliated hospital of Sun Yat-Sen University, 600 Tianhe Rd, Guangzhou, 510630, China.
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Enhancement of Motor Function Recovery after Spinal Cord Injury in Mice by Delivery of Brain-Derived Neurotrophic Factor mRNA. MOLECULAR THERAPY. NUCLEIC ACIDS 2019; 17:465-476. [PMID: 31344657 PMCID: PMC6658833 DOI: 10.1016/j.omtn.2019.06.016] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 05/27/2019] [Accepted: 06/17/2019] [Indexed: 12/20/2022]
Abstract
Spinal cord injury (SCI) is a debilitating condition that can cause impaired motor function or full paralysis. In the days to weeks following the initial mechanical injury to the spinal cord, inflammation and apoptosis can cause additional damage to the injured tissues. This secondary injury impairs recovery. Brain-derived neurotrophic factor is a secreted protein that has been shown to improve a variety of neurological conditions, including SCI, by promoting neuron survival and synaptic plasticity. This study treated a mouse model of contusion SCI using a single dose of brain-derived neurotrophic factor (BDNF) mRNA nanomicelles prepared with polyethylene glycol polyamino acid block copolymer directly injected into the injured tissue. BDNF levels in the injured spinal cord tissue were approximately doubled by mRNA treatment. Motor function was monitored using the Basso Mouse Scale and Noldus CatWalk Automated Gait Analysis System for 6 weeks post-injury. BDNF-treated mice showed improved motor function recovery, demonstrating the feasibility of mRNA delivery to treat SCI.
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Acupuncture-Analgesia-Mediated Alleviation of Central Sensitization. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2019; 2019:6173412. [PMID: 30984277 PMCID: PMC6431485 DOI: 10.1155/2019/6173412] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Revised: 07/20/2018] [Accepted: 02/06/2019] [Indexed: 12/20/2022]
Abstract
Pain can trigger central amplification called central sensitization, which ultimately results in hyperalgesia and/or allodynia. Many reports have showed acupuncture has an analgesic effect. We searched the related article on PubMed database and Cochrane database to discover central sensitization pathway in acupuncture analgesia. We summarized that acupuncture enhances the descending inhibitory effect and modulates the feeling of pain, thus modifying central sensitization. The possible mechanisms underlying the analgesic effects of acupuncture include segmental inhibition and the activation of the endogenous opioid, adrenergic, 5-hydroxytryptamine, and N-methyl-D-aspartic acid, α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid/kainate pathways. Moreover, acupuncture can locally reduce the levels of inflammatory mediators. In clinical settings, acupuncture can be used to treat headache, neuropathic pain, low back pain, osteoarthritis, and irritable bowel syndrome. These mechanisms of acupuncture analgesia may be involved in the alleviation of central sensitization.
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Retamal J, Reyes A, Ramirez P, Bravo D, Hernandez A, Pelissier T, Villanueva L, Constandil L. Burst-Like Subcutaneous Electrical Stimulation Induces BDNF-Mediated, Cyclotraxin B-Sensitive Central Sensitization in Rat Spinal Cord. Front Pharmacol 2018; 9:1143. [PMID: 30364099 PMCID: PMC6191473 DOI: 10.3389/fphar.2018.01143] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Accepted: 09/21/2018] [Indexed: 11/18/2022] Open
Abstract
Intrathecal administration of brain derived neurotrophic factor (BDNF) induces long-term potentiation (LTP) and generates long-lasting central sensitization in spinal cord thus mimicking chronic pain, but the relevance of these observations to chronic pain mechanisms is uncertain. Since C-fiber activation by a high-frequency subcutaneous electrical stimulation (SES) protocol causes spinal release of BDNF and induces spinal cord LTP, we propose that application of such protocol would be a sufficient condition for generating long-lasting BDNF-mediated central sensitization. Results showed that application of burst-like SES to rat toes produced (i) rapid induction of hyperalgesia that lasted for more than 3 weeks, (ii) early increase of C-reflex activity followed by increased wind-up scores lasting for more than 1 week, and (iii) early increase followed by late decrease in BDNF protein levels and phosphorylated TrkB that lasted for more than 1 week. These changes were prevented by the TrkB antagonist cyclotraxin-B administered shortly before SES, while hyperalgesia was reversed by cyclotraxin-B administered 3 days after SES. Results suggest that mechanisms underlying central sensitization first involve BDNF release of probably neuronal origin, followed by brief increased expression of likely glial BDNF and pTrkB that could switch early phase sensitization into late one.
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Affiliation(s)
- Jeffri Retamal
- Laboratory of Neurobiology, Department of Biology, Faculty of Chemistry and Biology, University of Santiago de Chile, Santiago, Chile.,Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Santiago, Chile
| | - Andrea Reyes
- Laboratory of Neurobiology, Department of Biology, Faculty of Chemistry and Biology, University of Santiago de Chile, Santiago, Chile
| | - Paulina Ramirez
- Laboratory of Neurobiology, Department of Biology, Faculty of Chemistry and Biology, University of Santiago de Chile, Santiago, Chile.,Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Santiago, Chile
| | - David Bravo
- Laboratory of Neurobiology, Department of Biology, Faculty of Chemistry and Biology, University of Santiago de Chile, Santiago, Chile.,Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Santiago, Chile
| | - Alejandro Hernandez
- Laboratory of Neurobiology, Department of Biology, Faculty of Chemistry and Biology, University of Santiago de Chile, Santiago, Chile
| | - Teresa Pelissier
- Program of Molecular and Clinical Pharmacology, Institute of Biomedical Sciences, Faculty of Medicine, University of Chile, Santiago, Chile
| | - Luis Villanueva
- Centre de Psychiatrie et Neurosciences, INSERM UMR 894, Paris, France
| | - Luis Constandil
- Laboratory of Neurobiology, Department of Biology, Faculty of Chemistry and Biology, University of Santiago de Chile, Santiago, Chile.,Center for the Development of Nanoscience and Nanotechnology (CEDENNA), Santiago, Chile
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14
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Kaka U, Rahman NA, Abubakar AA, Goh YM, Fakurazi S, Omar MA, Chen HC. Pre-emptive multimodal analgesia with tramadol and ketamine-lidocaine infusion for suppression of central sensitization in a dog model of ovariohysterectomy. J Pain Res 2018; 11:743-752. [PMID: 29695926 PMCID: PMC5905489 DOI: 10.2147/jpr.s152475] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Objectives The effects of pre-emptive infusion of ketamine-lidocaine with tramadol on the suppression of central sensitization were investigated in a dog ovariohysterectomy model. Patients and methods Twelve dogs were randomly assigned to two groups: ketamine-lidocaine-tramadol (KLT) and tramadol (T) groups. Both groups received intravenous tramadol 4 mg/kg body weight as premedication. Immediately after induction, the KLT group received ketamine and lidocaine at 0.5 and 2 mg/kg loading dose, followed by continuous rate infusion of 50 and 100 µg/kg/min, respectively, for 2 hours. Dogs in T group received saline bolus and continuous rate infusion at equi-volume. Intraoperatively, hemodynamic responses to surgical stimulation were recorded, whereas postoperative pain was evaluated using an algometer and short form of the Glasgow composite measure pain scale. Results Intraoperatively, hemodynamic responses to surgical stimulation were obtunded to a greater degree in KLT compared to T group. Postoperatively, the pain scores increased only for the first hour in KLT group, compared to 12 hours in T group. Mechanical thresholds at the abdomen decreased postoperatively between 12 and 60 hours in KLT group versus the entire 72 hours in T group. Thresholds at tibia and radius in both groups increased in the immediate 1 hour postoperatively, but decreased thereafter. Significant decrement of thresholds from baseline were detected in the tibia at 24, 42, and 60 hours in KLT group compared to 24-72 hours in T group, and in the radius between 36 and 48 hours in T group, but none in KLT group. Conclusion Addition of pre-emptive ketamine-lidocaine infusion to single intravenous dose of tramadol enhanced attenuation of central sensitization and improved intra- and postoperative analgesia.
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Affiliation(s)
- Ubedullah Kaka
- Department of Companion Animal Medicine and Surgery, Faculty of Veterinary Medicine.,Institute of Tropical Agriculture and Food Security, Universiti Putra Malaysia, Serdang, Malaysia
| | - Nor-Alimah Rahman
- Department of Companion Animal Medicine and Surgery, Faculty of Veterinary Medicine
| | - Adamu Abdul Abubakar
- Department of Companion Animal Medicine and Surgery, Faculty of Veterinary Medicine.,Department of Veterinary Surgery and Radiology, Usmanu Danfodiyo University, Sokoto, Nigeria
| | - Yong Meng Goh
- Institute of Tropical Agriculture and Food Security, Universiti Putra Malaysia, Serdang, Malaysia.,Department of Preclinical Veterinary Sciences, Faculty of Veterinary Medicine
| | - Sharida Fakurazi
- Laboratory of Vaccines and Immunotherapeutics, Institute of Bioscience.,Department of Human Anatomy, Faculty of Medicine and Health Science, Universiti Putra Malaysia, Serdang, Malaysia
| | - Mohamed Ariff Omar
- Department of Preclinical Veterinary Sciences, Faculty of Veterinary Medicine
| | - Hui Cheng Chen
- Department of Companion Animal Medicine and Surgery, Faculty of Veterinary Medicine
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Tateiwa H, Kawano T, Nishigaki A, Yamanaka D, Aoyama B, Shigematsu-Locatelli M, Eguchi S, Locatelli FM, Yokoyama M. The role of hippocampal brain-derived neurotrophic factor in age-related differences in neuropathic pain behavior in rats. Life Sci 2018; 197:56-66. [DOI: 10.1016/j.lfs.2018.01.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Revised: 01/16/2018] [Accepted: 01/30/2018] [Indexed: 01/22/2023]
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