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Allodynia

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https://www.readbyqxmd.com/read/29229703/orai1-plays-a-crucial-role-in-central-sensitization-by-modulating-neuronal-excitability
#1
Yannong Dou, Jingsheng Xia, Ruby Gao, Xinghua Gao, Frances M Munoz, Dongyu Wei, Yuzhen Tian, James E Barrett, Seena Ajit, Olimpia Meucci, James W Putney, Yue Dai, Huijuan Hu
Pathological pain is a common and debilitating condition that is often poorly managed. Central sensitization is an important mechanism underlying pathological pain. However, candidate molecules involved in central sensitization remain unclear. Store-operated calcium channels (SOCs) mediate important calcium signals in non-excitable and excitable cells. SOCs have been implicated in a wide variety of human pathophysiological conditions including immunodeficiency, occlusive vascular diseases and cancer. However, the role of SOCs in central nervous system (CNS) disorders has been relatively unexplored...
December 11, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29229209/randomized-double-blind-placebo-controlled-dose-escalation-study-investigation-of-the-safety-pharmacokinetics-and-antihyperalgesic-activity-of-l-4-chlorokynurenine-in-healthy-volunteers
#2
Mark Wallace, Alexander White, Kathy A Grako, Randal Lane, Allen Jo Cato, H Ralph Snodgrass
BACKGROUND AND AIMS: Neuropathic pain is a significant medical problem needing more effective treatments with fewer side effects. Overactive glutamatergic transmission via N-methyl-d-aspartate receptors (NMDARs) are known to play a role in central sensitization and neuropathic pain. Although ketamine, a NMDAR channel-blocking antagonist, is often used for neuropathic pain, its side-effect profile and abusive potential has prompted the search for a safer effective oral analgesic. A novel oral prodrug, AV-101 (l-4 chlorokynurenine), which, in the brain, is converted into one of the most potent and selective GlyB site antagonists of the NMDAR, has been demonstrated to be active in animal models of neuropathic pain...
October 2017: Scandinavian Journal of Pain
https://www.readbyqxmd.com/read/29222643/overexpression-of-sirt2-alleviates-neuropathic-pain-and-neuroinflammation-through-deacetylation-of-transcription-factor-nuclear-factor-kappa-b
#3
Yong Zhang, Dachao Chi
Sirtuin 2 (SIRT2), a member of the mammalian sirtuin family, plays an important role in the pathogenesis of various neurological diseases. However, whether SIRT2 is involved in the regulation of neuropathic pain remains unclear. In this study, we aimed to investigate the potential role of SIRT2 in regulating neuropathic pain in a rat model induced by chronic constriction injury (CCI). We found that SIRT2 was downregulated in the dorsal root ganglion (DRG) in CCI rats. Intrathecal injection of a recombinant adenovirus expressing SIRT2 markedly alleviated mechanical allodynia and thermal hyperalgesia in CCI rats...
December 8, 2017: Inflammation
https://www.readbyqxmd.com/read/29217355/crocetin-attenuates-spared-nerve-injury-induced-neuropathic-pain-in%C3%A2-mice
#4
Xiaolei Wang, Guangqing Zhang, Yong Qiao, Chang Feng, Xin Zhao
Crocetin is the main component of saffron and exhibits anti-oxidative and anti-inflammatory effects. Neuroinflammation and oxidative stress have been recognized to play a crucial role in the pathogenesis of neuropathic pain. We investigated the effect of crocetin in a mouse model with neuropathic pain induced by spared nerve injury (SNI). Crocetin was intrathecally perfused at various doses for up to 12 days starting 3 days before the surgery. Behavioral tests were performed to determine pain sensitivity. The concentrations of proinflammatory cytokines tumor necrosis factor (TNF-α) and interleukin-1β (IL-1β) were measured to assess neuroinflammation...
November 24, 2017: Journal of Pharmacological Sciences
https://www.readbyqxmd.com/read/29215727/secreted-frizzled-related-protein-1-regulates-the-progression-of-neuropathic-pain-in-mice-following-spinal-nerve-ligation
#5
Jun Tang, Qing Ji, Li Jin, Mi Tian, Li Dong Zhang, Xiao Yu Liu
Previous studies have showed that the Wnt/β-catenin signaling pathway plays an important role in modulating neuropathic pain after sciatic nerve injury. In this study, we explored the role of secreted frizzled-related protein 1 (SFRP1), a Wnt antagonist, in neuropathic pain using a rat model following spinal nerve ligation (SNL). We found SNL-induced SFRP1 downregulation in the spinal cord. Further, the overexpression of SFRP1 via spinal injection into the spinal cord attenuated SNL-induced allodynia, hyperalgesia and neuroinflammation...
December 7, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29212409/-express-a-comparison-of-early-and-late-treatments-on-allodynia-and-its-chronification-in-experimental-neuropathic-pain
#6
Eric Salvat, Ipek Yalcin Christmann, Andre Muller, Michel Barrot
No abstract text is available yet for this article.
January 1, 2017: Molecular Pain
https://www.readbyqxmd.com/read/29210612/association-of-fine-motor-loss-and-allodynia-in-fibromyalgia-an-fnirs-study
#7
Aykut Eken, Didem Gökçay, Cemre Yılmaz, Bora Baskak, Ayşegül Baltacı, Murat Kara
Recent studies showed that fine motor control dysfunction was observed in fibromyalgia (FM) syndrome as well as allodynia. However, brain signatures of this association still remain unclear. In this study, finger tapping task (FTT) and median nerve stimulation (MNS) were applied to both hands of 15 FM patients and healthy controls (HC) to understand this relationship. Hemodynamic activity was measured simultaneously using functional near-infrared spectroscopy (fNIRS). Experiments were analyzed separately by using 2x2 repeated measures ANOVA...
December 6, 2017: Journal of Motor Behavior
https://www.readbyqxmd.com/read/29210461/chronic-pain-in-pachyonychia-congenita-evidence-for-neuropathic-origin
#8
S Brill, E Sprecher, F J D Smith, N Geva, H Gruener, H Nahman-Averbuch, R Defrin
BACKGROUND: Pachyonychia congenita (PC) is a rare autosomal dominant skin disease with chronic pain being the most prominent complaint. Histological studies showing alterations in sensory innervation along with few reports on alterations in mechanical sensitivity suggest that PC may be a form of neuropathy. OBJECTIVE: To systematically evaluate sensory function of PC patients vs. controls, here for the first time, in order to investigate PC pathophysiology. METHODS: Patients (n=62) and controls (n=45) completed the McGill and Douleur Neuropathique-4 (DN4) questionnaires...
December 6, 2017: British Journal of Dermatology
https://www.readbyqxmd.com/read/29209138/effects-of-glutathione-on-mechanical-allodynia-and-central-sensitization-in-chronic-postischemic-pain-rats
#9
Jinseok Yeo, Hoon Jung, Hyerim Lee
Background: The chronic postischemia pain (CPIP) model is an animal model using ischemia/reperfusion injury that mimics the symptoms of complex regional pain syndrome type I. Glutathione (GSH) prevents ischemia/reperfusion injury by scavenging free radicals. We conducted this study to investigate the protective effect of GSH in CPIP rats via changes of mechanical allodynia and phospholyration of the N-methyl-D-aspartate receptor subunit GluN1. Methods: We divided 45 rats into 5 groups: sham, CPIP, CPIP + GSH 100 mg/kg, CPIP + GSH 200 mg/kg, and CPIP + GSH 500 mg/kg...
2017: Pain Research & Management: the Journal of the Canadian Pain Society
https://www.readbyqxmd.com/read/29206213/duloxetine-protects-against-oxaliplatin-induced-neuropathic-pain-and-spinal-neuron-hyperexcitability-in-rodents
#10
Woojin Kim, Yeongu Chung, Seunghwan Choi, Byung-Il Min, Sun Kwang Kim
Oxaliplatin is a widely used chemotherapy agent, but induces serious peripheral neuropathy. Duloxetine is a dual reuptake inhibitor of serotonin and norepinephrine, and is shown to be effective against pain. However, whether and how duloxetine can attenuate oxaliplatin-induced allodynia in rodents is not clearly understood. A single injection of oxaliplatin (6 mg/kg, intraperitoneal; i.p.) induced a cold and mechanical allodynia, which was assessed by acetone and von Frey filament tests, respectively. When significant allodynic signs were observed, three different doses of duloxetine (10, 30, and 60 mg/kg, i...
December 5, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29201256/neuropeptides-and-atp-signaling-in-the-trigeminal-ganglion
#11
REVIEW
Tetsuya Goto, Haruki Iwai, Eriko Kuramoto, Atsushi Yamanaka
Peripheral nociceptive stimuli from orofacial structures are largely transmitted by the trigeminal nerve. According to the peripheral noxious stimuli, neurons in the trigeminal ganglion (TG) produce neuropeptides such as substance P, and calcitonin-gene-related peptide, etc. Beside the production of neuropeptides, there exists unique non-synaptic interaction system between maxillary and mandibular neurons in the TG. Neurons in the TG are surrounded by satellite glial cells (SGCs), which initially receive the signal from TG neurons...
November 2017: Japanese Dental Science Review
https://www.readbyqxmd.com/read/29200909/the-efficacy-of-combination-treatment-of-gabapentin-and-electro-acupuncture-on-paclitaxel-induced-neuropathic-pain
#12
Min Joon Kim, Ji Hwan Lee, Jo Ung Jang, Fu Shi Quan, Sun Kwang Kim, Woojin Kim
Paclitaxel, a chemotherapeutic drug, induces severe peripheral neuropathy. Gabapentin (GBT) is a first line agent used to treat neuropathic pain, and its effect is mediated by spinal noradrenergic and muscarinic cholinergic receptors. Electro-acupuncture (EA) is used for treating various types of pain via its action through spinal opioidergic and noradrenergic receptors. Here, we investigated whether combined treatment of these two agents could exert a synergistic effect on paclitaxel-induced cold and mechanical allodynia, which were assessed by the acetone drop test and von Frey filament assay, respectively...
November 2017: Korean Journal of Physiology & Pharmacology
https://www.readbyqxmd.com/read/29196860/role-of-thrombin-in-soluble-thrombomodulin-induced-suppression-of-peripheral-hmgb1-mediated-allodynia-in-mice
#13
Ryuichi Tsujita, Maho Tsubota, Yusuke Hayashi, Haruka Saeki, Fumiko Sekiguchi, Atsufumi Kawabata
High mobility group box 1 (HMGB1), a nuclear protein, once released into the extracellular space under pathological conditions, plays a pronociceptive role in redox-dependent distinct active forms, all-thiol HMGB1 (at-HMGB1) and disulfide HMGB1 (ds-HMGB1), that accelerate nociception through the receptor for advanced glycation endproducts (RAGE) and Toll-like receptor 4 (TLR4), respectively. Thrombomodulin (TM), an endothelial membrane protein, and soluble TM, known as TMα, promote thrombin-mediated activation of protein C and also sequester HMGB1, which might facilitate thrombin degradation of HMGB1...
December 1, 2017: Journal of Neuroimmune Pharmacology: the Official Journal of the Society on NeuroImmune Pharmacology
https://www.readbyqxmd.com/read/29196315/phosphorylated-ccaat-enhancer-binding-protein-%C3%AE-contributes-to-rat-hiv-related-neuropathic-pain-in-vitro-and-in-vivo-studies
#14
Hyun Yi, Shue Liu, Yuta Kashiwagi, Daigo Ikegami, Wan Huang, Hirotsugu Kanda, Takafumi Iida, Ching-Hang Liu, Keiya Takahashi, David A Lubarsky, Shuanglin Hao
Chronic pain is increasingly recognized as an important comorbidity of HIV-infected patients, however, the exact molecular mechanisms of HIV-related pain are still elusive. CCAAT/enhancer binding proteins (C/EBPs) are expressed in various tissues, including the central nervous system. C/EBPβ, one of C/EBPs is involved in the progression of HIV/AIDS, but the exact role of C/EBPβ and its upstream factors are not clear in HIV pain state. Here, we used a neuropathic pain model of perineural HIV envelope glycoprotein gp120 application onto the rat sciatic nerve to test the role of phosphorylated C/EBPβ (pC/EBPβ) and its upstream pathway in the spinal cord dorsal horn (SCDH)...
December 1, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29194851/superiority-of-capsaicin-8-patch-versus-oral-pregabalin-on-dynamic-mechanical-allodynia-in-patients-with-peripheral-neuropathic-pain
#15
G Cruccu, T J Nurmikko, E Ernault, F K Riaz, W T McBride, M Haanpää
BACKGROUND: Dynamic Mechanical Allodynia (DMA) is a typical symptom of neuropathic pain (NP). In a recent study, the capsaicin 8% patch was noninferior to pregabalin in overall peripheral NP relief. In this study, we report the comparison of the two treatments in relieving DMA. METHODS: In a randomized, open-label, head-to-head, 8-week study, 488 patients with peripheral NP were treated with the capsaicin 8% patch (one application) or an optimized dose of pregabalin...
December 1, 2017: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/29193444/morin-exerts-neuroprotection-via-attenuation-of-ros-induced-oxidative-damage-and-neuroinflammation-in-experimental-diabetic-neuropathy
#16
Pragna Bachewal, Chayanika Gundu, Veera Ganesh Yerra, Anil Kumar Kalvala, Aparna Areti, Ashutosh Kumar
Morin, a bioflavonoid with diverse pharmacological effects against various diseases; in most cases morin protective effects were attributed to its detoxifying effect against reactive oxygen species (ROS). Diabetic neuropathy (DN) is a chronic, debilitating neuronal pain associated with intense generation of free radicals and proinflammatory cytokine accumulation in peripheral neurons. We investigated the pharmacological effect of morin against metabolic excess mediated mitochondrial ROS generation and corresponding effect on Nrf2, NF-κB pathways in Streptozotocin (STZ)-induced diabetic rats and in high glucose insulted Mouse neuroblastoma cell line, Neuro 2A (N2A)...
November 28, 2017: BioFactors
https://www.readbyqxmd.com/read/29192190/schwann-cell-trpa1-mediates-neuroinflammation-that-sustains-macrophage-dependent-neuropathic-pain-in-mice
#17
Francesco De Logu, Romina Nassini, Serena Materazzi, Muryel Carvalho Gonçalves, Daniele Nosi, Duccio Rossi Degl'Innocenti, Ilaria M Marone, Juliano Ferreira, Simone Li Puma, Silvia Benemei, Gabriela Trevisan, Daniel Souza Monteiro de Araújo, Riccardo Patacchini, Nigel W Bunnett, Pierangelo Geppetti
It is known that transient receptor potential ankyrin 1 (TRPA1) channels, expressed by nociceptors, contribute to neuropathic pain. Here we show that TRPA1 is also expressed in Schwann cells. We found that in mice with partial sciatic nerve ligation, TRPA1 silencing in nociceptors attenuated mechanical allodynia, without affecting macrophage infiltration and oxidative stress, whereas TRPA1 silencing in Schwann cells reduced both allodynia and neuroinflammation. Activation of Schwann cell TRPA1 evoked NADPH oxidase 1 (NOX1)-dependent H2O2 release, and silencing or blocking Schwann cell NOX1 attenuated nerve injury-induced macrophage infiltration, oxidative stress and allodynia...
December 1, 2017: Nature Communications
https://www.readbyqxmd.com/read/29190962/wu-tou-decoction-attenuates-neuropathic-pain-via-suppressing-spinal-astrocytic-il-1r1-traf6-jnk-signaling
#18
Chao Wang, Xiangying Kong, Chunyan Zhu, Chunfang Liu, Danni Sun, Qionghong Xu, Zhiyun Mao, Qingxia Qin, Hongchang Su, Danqiao Wang, Xiaoliang Zhao, Na Lin
Neuropathic pain (NP) caused by nerve injuries continues to be an intractable challenge due to inadequate therapeutic strategies. Recent study demonstrated glia-induced neuro-inflammation in the spinal cord, especially the activation of astrocytes, plays an essential role in the development of NP, which opens new avenues for NP treatment. In this study, we explored the anti-hyperalgesia properties of Wu-tou decoction (WTD) and showed that WTD potently attenuates mechanical allodynia and heat hyperalgesia in lumbar 5 (L5) spinal nerve ligation (SNL)-induced NP without noticeable side effect or affecting basal pain perception of mice...
November 3, 2017: Oncotarget
https://www.readbyqxmd.com/read/29188473/effect-of-simvastatin-on-sensorial-motor-and-morphological-parameters-in-sciatic-nerve-crush-induced-neuropathic-pain-in-rats
#19
Claudia Rita Corso, Daniel Fernandes Martins, Stephanie Carvalho Borges, Olair Carlos Beltrame, José Ederaldo Queiroz Telles, Nilza Cristina Buttow, Maria Fernanda de Paula Werner
The present study compares the effects of a low and high doses of simvastatin in a model of peripheral neuropathy by evaluating sensorial, motor, and morphological parameters. First, male Wistar rats were orally treated with vehicle (saline, 1 mL/kg), simvastatin (2 and 80 mg/kg) or morphine (2 mg/kg, s.c.), 1 h before 2.5% formalin injection. Neuropathic pain was induced by crushing the sciatic nerve, and mechanical and cold allodynia, nerve function, histology, MPO and NAG concentrations, as well as mevalonate induced-nociception were evaluated...
November 29, 2017: Inflammopharmacology
https://www.readbyqxmd.com/read/29187670/differential-development-of-facial-and-hind-paw-allodynia-in-a-nitroglycerin-induced-mouse-model-of-chronic-migraine-role-of-capsaicin-sensitive-primary-afferents
#20
Sol-Ji Kim, Ji-Hee Yeo, Seo-Yeon Yoon, Soon-Gu Kwon, Jang-Hern Lee, Alvin J Beitz, Dae-Hyun Roh
Despite the relatively high prevalence of migraine or headache, the pathophysiological mechanisms triggering headache-associated peripheral hypersensitivities, are unknown. Since nitric oxide (NO) is well known as a causative factor in the pathogenesis of migraine or migraine-associated hypersensitivities, a mouse model has been established using systemic administration of the NO donor, nitroglycerin (NTG). Here we tried to investigate the time course development of facial or hindpaw hypersensitivity after repetitive NTG injection...
November 29, 2017: Biological & Pharmaceutical Bulletin
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