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https://www.readbyqxmd.com/read/30497261/comprehensive-3d-qsar-model-predicts-binding-affinity-of-structurally-diverse-sigma-1-receptor-ligands
#1
Youyi Peng, Hiep Dong, William J Welsh
The Sigma 1 Receptor (S1R) has attracted intense interest as a pharmaceutical target for various therapeutic indications, including the treatment of neuropathic pain and the potentiation of opioid analgesia. Efforts by drug developers to rationally design S1R antagonists have been spurred recently by the 2016 publication of the high-resolution X-ray crystal structure of the ligand-bound human S1R. Until now, however, the absence in the published literature of a single, large-scale, and comprehensive quantitative structure-activity relationship (QSAR) model that encompasses a structurally diverse collection of S1R ligands has impaired rapid progress...
November 29, 2018: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/30459229/nociceptor-translational-profiling-reveals-the-ragulator-rag-gtpase-complex-as-a-critical-generator-of-neuropathic-pain
#2
Salim Megat, Pradipta R Ray, Jamie K Moy, Tzu-Fang Lou, Paulino Barragan-Iglesias, Yan Li, Grishma Pradhan, Andi Wanghzou, Ayesha Ahmad, Michael D Burton, Robert Y North, Patrick M Dougherty, Arkady Khoutorsky, Nahum Sonenberg, Kevin R Webster, Gregory Dussor, Zachary T Campbell, Theodore J Price
Nociceptors, sensory neurons in the dorsal root ganglion (DRG) that detect damaging or potentially damaging stimuli, are key drivers of neuropathic pain. Injury to these neurons causes activation of translation regulation signaling including the mechanistic target of rapamycin complex 1 (mTORC1) and mitogen activated protein kinase interacting kinase (MNK) eukaryotic initiation factor (eIF) 4E pathways. This is a mechanism driving changes in excitability of nociceptors that is critical for the generation of chronic pain states, however, the mRNAs that are translated to lead to this plasticity have not been elucidated...
November 20, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/30369611/rapidly-destructive-arthrosis-of-bilateral-humeral-heads-caused-by-subchondral-insufficiency-fracture
#3
Rika Kakutani, Naoki Kondo, Tomoharu Mochizuki, Junichi Fujisawa, Naoto Endo
The bilateral shoulder pain of an 81-year-old Japanese woman due to falls persisted despite celecoxib treatment, and plain X-rays later showed bilateral collapsed humeral heads. After ruling out osteoarthritis, infectious arthritis, crystal-induced arthritis, neuropathic arthropathy, and osteonecrosis, we diagnosed bilateral shoulder joint rapidly destructive arthrosis (RDA). Lumbar bone mineral density showed very low T-score (-4.1). Primary osteoporosis was observed. Histology of biopsied humeral head indicated the features of fracture healing process: callus formation and osteoclasts without empty lacunae...
October 2018: Acta Medica Okayama
https://www.readbyqxmd.com/read/30249616/molecular-determinants-of-%C3%AE-conotoxin-potency-for-inhibition-of-human-and-rat-%C3%AE-6%C3%AE-4-nicotinic-acetylcholine-receptors
#4
Arik J Hone, Todd T Talley, Janet Bobango, Cesar Huidobro Melo, Fuaad Hararah, Joanna Gajewiak, Sean Christensen, Peta J Harvey, David J Craik, J Michael McIntosh
Nicotinic acetylcholine receptors (nAChRs) containing α6 and β4 subunits are expressed by dorsal root ganglion neurons and have been implicated in neuropathic pain. Rodent models are often used to evaluate the efficacy of analgesic compounds, but species differences may affect the activity of some nAChR ligands. A previous candidate α-conotoxin-based therapeutic yielded promising results in rodent models, but failed in human clinical trials, emphasizing the importance of understanding species differences in ligand activity...
November 16, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29976627/angiotensin-ii-triggers-peripheral-macrophage-to-sensory-neuron-redox-crosstalk-to-elicit-pain
#5
Andrew J Shepherd, Bryan A Copits, Aaron D Mickle, Páll Karlsson, Suraj Kadunganattil, Simon Haroutounian, Satya M Tadinada, Annette D de Kloet, Manouela V Valtcheva, Lisa A McIlvried, Tayler D Sheahan, Sanjay Jain, Pradipta R Ray, Yuriy M Usachev, Gregory Dussor, Eric G Krause, Theodore J Price, Robert W Gereau, Durga P Mohapatra
Injury, inflammation, and nerve damage initiate a wide variety of cellular and molecular processes that culminate in hyperexcitation of sensory nerves, which underlies chronic inflammatory and neuropathic pain. Using behavioral readouts of pain hypersensitivity induced by angiotensin II (Ang II) injection into mouse hindpaws, our study shows that activation of the type 2 Ang II receptor (AT2R) and the cell-damage-sensing ion channel TRPA1 are required for peripheral mechanical pain sensitization induced by Ang II in male and female mice...
August 8, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29803994/design-synthesis-and-x-ray-crystallography-of-selenides-bearing-benzenesulfonamide-moiety-with-neuropathic-pain-modulating-effects
#6
Andrea Angeli, Lorenzo di Cesare Mannelli, Elena Lucarini, Thomas S Peat, Carla Ghelardini, Claudiu T Supuran
A series of selenides bearing benzensulfonamide were investigated as inhibitors of the metalloenzyme carbonic anhydrase (CA, EC 4.2.1.1). Potent inhibitory action, in the low nanomolar range, was detected against isoforms hCA II and VII, which are known to be involved in neuropathic pain modulation. These selenides showed on the other hand moderate inhibition against the cytosolic isoforms hCA I and transmembrane hCA IX. X-ray crystallographic data of two derivatives bound to hCA II allowed us to rationalize the excellent inhibitory data...
June 25, 2018: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29237480/achilles-tenodesis-for-calcaneal-insufficiency-avulsion-fractures-associated-with-diabetes-mellitus
#7
Youngrak Choi, Young-Woo Kwon, Young-Suk Sim, Taeho Kim, Dayoung Song, Soohyun Lee
BACKGROUND: Calcaneal insufficiency avulsion (CIA) fractures often present with neuropathic etiology, such as Charcot neuroarthropathy (CN). Under the same surgical procedures, the outcomes of CIA fractures are less desirable, compared to the outcomes of the traumatic calcaneal avulsion fractures. Here, the study suggests Achilles tenodesis technique using suture anchor after resection of the CIA fracture fragments could provide satisfactory clinical results in the cases of surgically indicated CIA fractures...
December 13, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29188558/breakthrough-in-gpcr-crystallography-and-its-impact-on-computer-aided-drug-design
#8
Antonella Ciancetta, Kenneth A Jacobson
Recent crystallographic structures of G protein-coupled receptors (GPCRs) have greatly advanced our understanding of the recognition of their diverse agonist and antagonist ligands. We illustrate here how this applies to A2A adenosine receptors (ARs) and to P2Y1 and P2Y12 receptors (P2YRs) for ADP. These X-ray structures have impacted the medicinal chemistry aimed at discovering new ligands for these two receptor families, including receptors that have not yet been crystallized but are closely related to the known structures...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29136763/amorphous-solid-dispersions-of-hecogenin-acetate-using-different-polymers-for-enhancement-of-solubility-and-improvement-of-anti-hyperalgesic-effect-in-neuropathic-pain-model-in-mice
#9
Carlos Demócedes Luís de França Almeida Moreira, Jonas Gabriel de Oliveira Pinheiro, Walter Ferreira da Silva-Júnior, Euzébio Guimarães Barbosa, Zênia Maria Maciel Lavra, Erick Willyame Menezes Pereira, Marília Matos Resende, Eduardo Pereira de Azevedo, Lucindo José Quintans-Júnior, Adriano Antunes de Souza Araújo, Jullyana de Souza Siqueira Quintans, Ádley Antonini Neves de Lima
Hecogenin acetate (HA) is an acetylated sapogenin that has shown potential antihyperalgesic activity, inhibiting descending pain and acting in opioid receptors. However, HA exhibits poor aqueous solubility, which may limit its application. This study aims to develop amorphous solid dispersions (ASD) using five hydrophilic polymers, to characterize them and to evaluate their antihyperalgesic activity. Physicochemical characterization was performed by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Fourier Transformed Infrared (FTIR) spectroscopy...
January 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29094006/neuropathic-pain-like-symptoms-and-pre-surgery-radiographic-severity-contribute-to-patient-satisfaction-4-8-years-post-total-joint-replacement
#10
Sophie C Warner, Helen Richardson, Wendy Jenkins, Thomas Kurien, Michael Doherty, Ana M Valdes
AIM: To investigate a comprehensive range of factors that contribute to long-term patient satisfaction post-total joint replacement (TJR) in people who had undergone knee or hip replacement for osteoarthritis. METHODS: Participants ( n = 1151) were recruited from Nottinghamshire post-total hip or knee replacement. Questionnaire assessment included medication use, the pain-DETECT questionnaire (PDQ) to assess neuropathic pain-like symptoms (NP) and TJR satisfaction measured on average 4...
October 18, 2017: World Journal of Orthopedics
https://www.readbyqxmd.com/read/28644012/sigma-2-receptor-tmem97-agonists-produce-long-lasting-antineuropathic-pain-effects-in-mice
#11
James J Sahn, Galo L Mejia, Pradipta R Ray, Stephen F Martin, Theodore J Price
Neuropathic pain is an important medical problem with few effective treatments. The sigma 1 receptor (σ1R) is known to be a potential target for neuropathic pain therapeutics, and antagonists for this receptor are effective in preclinical models and are currently in phase II clinical trials. Conversely, relatively little is known about σ2R, which has recently been identified as transmembrane protein 97 (Tmem97). We generated a series of σ1R and σ2R/Tmem97 agonists and antagonists and tested them for efficacy in the mouse spared nerve injury (SNI) model...
August 16, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28611846/safety-of-allogeneic-canine-adipose-tissue-derived-mesenchymal-stem-cell-intraspinal-transplantation-in-dogs-with-chronic-spinal-cord-injury
#12
Cláudia Cardoso Maciel Escalhão, Isalira Peroba Ramos, Camila Hochman-Mendez, Tais Hanae Kasai Brunswick, Sergio Augusto Lopes Souza, Bianca Gutfilen, Regina Coeli Dos Santos Goldenberg, Tatiana Coelho-Sampaio
This is a pilot clinical study primarily designed to assess the feasibility and safety of X-ray-guided percutaneous intraspinal injection of allogeneic canine adipose tissue-derived mesenchymal stem cells in dogs with chronic spinal cord injury. Six dogs with chronic paraplegia (≥six months) were intraparenchymally injected with allogeneic cells in the site of lesion. Cells were obtained from subcutaneous adipose tissue of a healthy dog, cultured to passage 3, labeled with (99m)Technetium, and transplanted into the lesion by percutaneous X-ray-guided injection...
2017: Stem Cells International
https://www.readbyqxmd.com/read/28370724/clinical-paresthesia-atlas-illustrates-likelihood-of-coverage-based-on-spinal-cord-stimulator-electrode-location
#13
MULTICENTER STUDY
Alexander Taghva, Edward Karst, Paul Underwood
OBJECTIVE: Concordant paresthesia coverage is an independent predictor of pain relief following spinal cord stimulation (SCS). Using aggregate data, our objective is to produce a map of paresthesia coverage as a function of electrode location in SCS. METHODS: This retrospective analysis used x-rays, SCS programming data, and paresthesia coverage maps from the EMPOWER registry of SCS implants for chronic neuropathic pain. Spinal level of dorsal column stimulation was determined by x-ray adjudication and active cathodes in patient programs...
August 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28339391/topical-ketamine-10-for-neuropathic-pain-in-spinal-cord-injury-patients-an-open-label-trial
#14
Joseph Rabi, Joshua Minori, Hasan Abad, Ray Lee, Michelle Gittler
Topical ketamine, an N-methyl-D-aspartate antagonist, has been shown to be effective in certain neuropathic pain syndromes. The objective of this study was to determine the efficacy of topical ketamine in spinal cord injury patients with neuropathic pain. An open label trial enrolled five subjects at an outpatient rehabilitation hospital with traumatic spinal cord injuries who had neuropathic pain at or below the level of injury. Subjects applied topical ketamine 10% three times a day for a two-week duration...
November 2016: International Journal of Pharmaceutical Compounding
https://www.readbyqxmd.com/read/28158164/rapid-and-delayed-effects-of-pulsed-radiofrequency-on-neuropathic-pain-electrophysiological-molecular-and-behavioral-evidence-supporting-long-term-depression
#15
Ren-Yu Huang, Chia-Chi Liao, Shih-Ying Tsai, Chen-Tung Yen, Chii-Wann Lin, Tsung-Chi Chen, Wei-Tso Lin, Chi-Heng Chang, Yeong-Ray Wen
BACKGROUND: Pulsed radiofrequency (PRF) has been widely employed for ameliorating clinical neuropathic pain. How PRF alters electrophysiological transmission and modulates biomolecular functions in neural tissues has yet to be clarified. We previously demonstrated that an early application of low-voltage bipolar PRF adjacent to the dorsal root ganglion (DRG) reduced acute neuropathic pain in animals. By contrast, the present study investigated how PRF alters postsynaptic sensitization to produce early and delayed effects on neuropathic pain...
February 2017: Pain Physician
https://www.readbyqxmd.com/read/28056455/the-association-of-musculoskeletal-pain-with-bone-mineral-density-in-patients-with-parkinson-s-disease
#16
Seong-Min Choi, Byeong C Kim, Hyun-Jung Jung, Geum-Jin Yoon, Kyung Wook Kang, Kang-Ho Choi, Seung-Han Lee, Man-Seok Park, Myeong-Kyu Kim, Ki-Hyun Cho
BACKGROUND: Pain and osteoporosis are common in Parkinson's disease (PD), and lower bone mineral density (BMD) or osteoporosis may be associated with an increased risk of reporting to have pain in the general population. The aim of this study was to determine whether there is an association between the pain subtypes and the BMD in patients with PD. METHODS: We included 162 PD patients. Pain was assessed using the patients' descriptions, a structured interview, a detailed neurologic examination, and the Visual Analogue Scale...
2017: European Neurology
https://www.readbyqxmd.com/read/28005346/identification-of-crucial-amino-acid-residues-involved-in-agonist-signaling-at-the-gpr55-receptor
#17
Mary A Lingerfelt, Pingwei Zhao, Haleli P Sharir, Dow P Hurst, Patricia H Reggio, Mary E Abood
GPR55 is a newly deorphanized class A G-protein-coupled receptor that has been implicated in inflammatory pain, neuropathic pain, metabolic disorder, bone development, and cancer. Few potent GPR55 ligands have been identified to date. This is largely due to an absence of information about salient features of GPR55, such as residues important for signaling and residues implicated in the GPR55 signaling cascade. The goal of this work was to identify residues that are key for the signaling of the GPR55 endogenous ligand, l-α-lysophosphatidylinositol (LPI), as well as the signaling of the GPR55 agonist, ML184 {CID 2440433, 3-[4-(2,3-dimethylphenyl)piperazine-1-carbonyl]-N,N-dimethyl-4-pyrrolidin-1-ylbenzenesulfonamide}...
January 24, 2017: Biochemistry
https://www.readbyqxmd.com/read/27991902/crystal-structures-of-human-glycine-receptor-%C3%AE-3-bound-to-a-novel-class-of-analgesic-potentiators
#18
Xin Huang, Paul L Shaffer, Shawn Ayube, Howard Bregman, Hao Chen, Sonya G Lehto, Jason A Luther, David J Matson, Stefan I McDonough, Klaus Michelsen, Matthew H Plant, Stephen Schneider, Jeffrey R Simard, Yohannes Teffera, Shuyan Yi, Maosheng Zhang, Erin F DiMauro, Jacinthe Gingras
Current therapies to treat persistent pain and neuropathic pain are limited by poor efficacy, side effects and risk of addiction. Here, we present a novel class of potent selective, central nervous system (CNS)-penetrant potentiators of glycine receptors (GlyRs), ligand-gated ion channels expressed in the CNS. AM-1488 increased the response to exogenous glycine in mouse spinal cord and significantly reversed mechanical allodynia induced by nerve injury in a mouse model of neuropathic pain. We obtained an X-ray crystal structure of human homopentameric GlyRα3 in complex with AM-3607, a potentiator of the same class with increased potency, and the agonist glycine, at 2...
February 2017: Nature Structural & Molecular Biology
https://www.readbyqxmd.com/read/27975350/diagnosis-of-neuropathic-components-in-patients-with-back-pain-before-and-after-surgery
#19
Y-J Lee, E M W Koch, J B Breidebach, R Bornemann, D C Wirtz, R Pflugmacher
Background: The perception of back pain subjective is hard for physicians to measure. For this reason, questionnaires are an important instrument to evaluate the pain 1. The main point of this study was to verify differentiation of pain symptoms in patients with different pain mechanisms. The most important parameter was the PainDetect questionnaire, which can differentiate between nociceptive and neuropathic pain. Additional parameters were measured before and after surgery to characterise pain symptoms in detail...
December 2016: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/27926736/structure-of-cc-chemokine-receptor-2-with-orthosteric-and-allosteric-antagonists
#20
Yi Zheng, Ling Qin, Natalia V Ortiz Zacarías, Henk de Vries, Gye Won Han, Martin Gustavsson, Marta Dabros, Chunxia Zhao, Robert J Cherney, Percy Carter, Dean Stamos, Ruben Abagyan, Vadim Cherezov, Raymond C Stevens, Adriaan P IJzerman, Laura H Heitman, Andrew Tebben, Irina Kufareva, Tracy M Handel
CC chemokine receptor 2 (CCR2) is one of 19 members of the chemokine receptor subfamily of human class A G-protein-coupled receptors. CCR2 is expressed on monocytes, immature dendritic cells, and T-cell subpopulations, and mediates their migration towards endogenous CC chemokine ligands such as CCL2 (ref. 1). CCR2 and its ligands are implicated in numerous inflammatory and neurodegenerative diseases including atherosclerosis, multiple sclerosis, asthma, neuropathic pain, and diabetic nephropathy, as well as cancer...
December 15, 2016: Nature
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