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Nociceptive pain

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https://www.readbyqxmd.com/read/29691410/control-of-mechanical-pain-hypersensitivity-in-mice-through-ligand-targeted-photoablation-of-trkb-positive-sensory-neurons
#1
Rahul Dhandapani, Cynthia Mary Arokiaraj, Francisco J Taberner, Paola Pacifico, Sruthi Raja, Linda Nocchi, Carla Portulano, Federica Franciosa, Mariano Maffei, Ahmad Fawzi Hussain, Fernanda de Castro Reis, Luc Reymond, Emerald Perlas, Simone Garcovich, Stefan Barth, Kai Johnsson, Stefan G Lechner, Paul A Heppenstall
Mechanical allodynia is a major symptom of neuropathic pain whereby innocuous touch evokes severe pain. Here we identify a population of peripheral sensory neurons expressing TrkB that are both necessary and sufficient for producing pain from light touch after nerve injury in mice. Mice in which TrkB-Cre-expressing neurons are ablated are less sensitive to the lightest touch under basal conditions, and fail to develop mechanical allodynia in a model of neuropathic pain. Moreover, selective optogenetic activation of these neurons after nerve injury evokes marked nociceptive behavior...
April 24, 2018: Nature Communications
https://www.readbyqxmd.com/read/29690724/-the-effect-of-berberine-on-ameliorating-chronic-inflammatory-pain-and-depression
#2
F Xu, J Yang, B Meng, J W Zheng, Q Liao, J P Chen, X W Chen
Objective: To explore the effect of berberine on chronic inflammatory pain and the comorbid depression and the associated mechanisms. Methods: Forty healthy male ICR mice (2 months, 25-30 g) were used in the present study. The chronic inflammatory pain was induced by intraplantar injection of complete freund's adjuvant (CFA) to the hind paws. All animals were divided into 4 groups ( n =10 for each group) according to random number table: the saline group (group A), the chronic pain group (group B), the saline+ berberine group (group C) and the chronic pain+ berberine group (group D)...
April 10, 2018: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29684014/testing-the-validity-and-reliability-of-the-arabic-version-of-the-paindetect-questionnaire-in-the-assessment-of-neuropathic-pain
#3
Amani Abu-Shaheen, Shehu Yousef, Muhammad Riaz, Abdullah Nofal, Isamme AlFayyad, Sarfaraz Khan, Humariya Heena
INTRODUCTION: Neuropathic pain (NP) can cause substantial suffering and, therefore, it must be diagnosed and treated promptly. Diagnosis of NP can be difficult and if made by an expert pain physician is considered the gold standard, however where expert help may not be easily available, screening tools for NP can be used. The painDETECT questionnaire (PD-Q) is a simple screening tool and has been widely used in several languages. We developed an Arabic version of PD-Q and tested its validity and reliability...
2018: PloS One
https://www.readbyqxmd.com/read/29683406/influence-of-anxiety-and-alexithymia-on-brain-activations-associated-with-the-perception-of-others-pain-in-autism
#4
Amandine Lassalle, Nicole R Zürcher, Carlo A Porro, Francesca Benuzzi, Loyse Hippolyte, Eric Lemonnier, Jakob Åsberg Johnels, Nouchine Hadjikhani
The circumstances under which empathy is altered in ASD remain unclear, as previous studies did not systematically find differences in brain activation between ASD and controls in empathy-eliciting paradigms, and did not always monitor whether differences were primarily due to ASD "per se", or to conditions overlapping with ASD, such as alexithymia and anxiety. Here, we collected fMRI data from 47 participants (22 ASD) viewing pictures depicting hands and feet of unknown others in painful, disgusting, or neutral situations...
April 23, 2018: Social Neuroscience
https://www.readbyqxmd.com/read/29681431/factors-associated-with-infant-pain-severity-undergoing-immunization-injections
#5
Manal Kassab, Shereen Hamadneh, Khawla Nuseir, Basima ALmomani, Jehan Hamadneh
PURPOSE: Factors influencing infants' behavioral and vocal (cry) response to painful stimuli are explored to improve pain management plans for infants undergoing immunizations. DESIGN AND METHODS: An observational study design was used. Pain responses of 60 to 75 days-old infants (44% male vs 56% female) undergoing two-month immunization injections were videotaped and coded using the Modified Behavioral Pain Scale (MBPS), and duration of total crying time during injection was recorded...
April 19, 2018: Journal of Pediatric Nursing
https://www.readbyqxmd.com/read/29680400/an-investigation-of-mechanical-nociceptive-thresholds-in-dogs-with-hind-limb-joint-pain-compared-to-healthy-control-dogs
#6
L K Harris, H R Whay, J C Murrell
This study investigated the effects of osteoarthritis (OA) on somatosensory processing in dogs using mechanical threshold testing. A pressure algometer was used to measure mechanical thresholds in 27 dogs with presumed hind limb osteoarthritis and 28 healthy dogs. Mechanical thresholds were measured at the stifles, radii and sternum, and were correlated with scores from an owner questionnaire and a clinical checklist, a scoring system that quantified clinical signs of osteoarthritis. The effects of age and bodyweight on mechanical thresholds were also investigated...
April 2018: Veterinary Journal
https://www.readbyqxmd.com/read/29679493/ppars-and-pain
#7
REVIEW
Bright N Okine, Jessica C Gaspar, David P Finn
Chronic pain is a common cause of disability worldwide and remains a global health and socioeconomic challenge. Current analgesics are either ineffective in a significant proportion of patients with chronic pain, or associated with significant adverse side effects. The peroxisome proliferator-activated receptors (PPARs), a family of nuclear hormone transcription factors, have emerged as important modulators of pain in preclinical studies and therefore a potential therapeutic target for the treatment of pain...
April 21, 2018: British Journal of Pharmacology
https://www.readbyqxmd.com/read/29679457/burst-spinal-cord-stimulation-in-peripherally-injured-chronic-neuropathic-rats-a-delayed-effect
#8
Koen P V Meuwissen, Jianwen Wendy Gu, Tianhe C Zhang, Elbert A J Joosten
OBJECTIVE: Two well-known spinal cord stimulation (SCS) paradigms, Conventional (Con) and Burst-SCS, are hypothesized to exert their anti-nociceptive effects through different stimulation-induced mechanisms. We studied the course of the behavioral anti-nociceptive effect during 60 minutes of SCS and 30 minutes post SCS, in a rat model of chronic neuropathic pain. MATERIAL AND METHODS: Animals received a unilateral partial sciatic nerve ligation, after which they were implanted with quadripolar electrodes into the epidural space at vertebral level T13 (n=43 rats)...
April 20, 2018: Pain Practice: the Official Journal of World Institute of Pain
https://www.readbyqxmd.com/read/29678208/glial-interleukin-1%C3%AE-upregulates-neuronal-sodium-channel-1-7-in-trigeminal-ganglion-contributing-to-temporomandibular-joint-inflammatory-hypernociception-in-rats
#9
Peng Zhang, Rui-Yun Bi, Ye-Hua Gan
BACKGROUND: The proinflammatory cytokine interleukin-1β (IL-1β) drives pain by inducing the expression of inflammatory mediators; however, its ability to regulate sodium channel 1.7 (Nav1.7), a key driver of temporomandibular joint (TMJ) hypernociception, remains unknown. IL-1β induces cyclooxygenase-2 (COX-2) and prostaglandin E2 (PGE2). We previously showed that PGE2 upregulated trigeminal ganglionic Nav1.7 expression. Satellite glial cells (SGCs) involve in inflammatory pain through glial cytokines...
April 20, 2018: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/29677019/mu-opioid-receptors-in-nociceptive-afferents-produce-a-sustained-suppression-of-hyperalgesia-in-chronic-pain
#10
Amie Severino, Wenling Chen, Joshua K Hakimian, Brigitte L Kieffer, Claire Gaveriaux-Ruff, Wendy Walwyn, Juan Carlos Marvizon
The latent sensitization model of chronic pain reveals that recovery from some types of long-term hyperalgesia is an altered state in which nociceptive sensitization persists but is suppressed by the ongoing activity of analgesic receptors such as µ-opioid receptors (MORs). To determine whether these MORs are the ones present in nociceptive afferents, we bred mice expressing Cre-recombinase under the Nav1.8 channel promoter (Nav1.8cre) with MOR-floxed mice (flMOR). These Nav1.8cre/flMOR mice had reduced MOR expression in primary afferents, as revealed by quantitative PCR, in situ hybridization and immunofluorescence colocalization with the neuropeptide CGRP...
April 17, 2018: Pain
https://www.readbyqxmd.com/read/29672451/spinal-protein-kinase-c-extracellular-signal-regulated-kinase-signal-pathway-mediates-hyperalgesia-priming
#11
Wei-Hsin Chen, Ya-Ting Chang, Yong-Cyuan Chen, Sin-Jhong Cheng, Chien-Chang Chen
Chronic pain can be initiated by one or more acute stimulations to sensitize neurons into the primed state. In the primed state, the basal nociceptive thresholds of the animal are normal, but, in response to another hyperalgesic stimulus, the animal develops enhanced and prolonged hyperalgesia. The exact mechanism of how primed state is formed is not completely understood. Here, we showed that spinal protein kinase C (PKC)/extracellular signal-regulated kinase (ERK) signal pathway is required for neuronal plasticity change, hyperalgesic priming formation, and the development of chronic hyperalgesia using acid-induced muscle pain model in mice...
May 2018: Pain
https://www.readbyqxmd.com/read/29672450/downregulation-of-adenosine-and-adenosine-1-receptor-contributes-to-neuropathic-pain-in-resiniferatoxin-neuropathy
#12
Hung-Wei Kan, Chin-Hong Chang, Chih-Lung Lin, Yi-Chen Lee, Sung-Tsang Hsieh, Yu-Lin Hsieh
The neurochemical effects of adenosine signaling in small-fiber neuropathy leading to neuropathic pain are yet to be explored in a direct manner. This study examined this system at the level of ligand (via the ectonucleotidase activity of prostatic acid phosphatase, PAP) and adenosine A1 receptors (A1Rs) in resiniferatoxin (RTX) neuropathy, a peripheral neurodegenerative disorder which specifically affects nociceptive nerves expressing transient receptor potential vanilloid type 1 (TRPV1). We conducted immunohistochemistry on dorsal root ganglion neurons (DRG), high-performance liquid chromatography (HPLC) for functional assays, and pharmacological interventions to alter PAP and A1Rs in mice with RTX neuropathy...
April 16, 2018: Pain
https://www.readbyqxmd.com/read/29671874/pain-assessment-by-pupil-dilation-reflex-in-response-to-noxious-stimulation-in-anaesthetized-adults
#13
D Wildemeersch, N Peeters, V Saldien, M Vercauteren, G Hans
BACKGROUND: In response to noxious stimulation, pupillary dilation reflex (PDR) occurs even in anaesthetized patients. The aim of the study was to evaluate the ability of pupillometry with an automated increasing stimulus intensity to monitor intraoperative opioid administration. METHODS: Thirty-four patients undergoing elective surgery were enrolled. Induction by propofol anaesthesia was increased progressively until the sedation depth criteria (SeD) were attained...
April 19, 2018: Acta Anaesthesiologica Scandinavica
https://www.readbyqxmd.com/read/29670396/sustained-analgesic-effect-of-clonidine-co-polymer-depot-in-a-porcine-incisional-pain-model
#14
Jared T Wilsey, Julie H Block
Background: Previous research suggests that the α2 adrenergic agonist clonidine, a centrally acting analgesic and antihypertensive, may also have direct effects on peripheral pain generators. However, aqueous injections are limited by rapid systemic absorption leading to off target effects and a brief analgesic duration of action. Purpose: The aim of this study was to examine the efficacy of a sustained-release clonidine depot, placed in the wound bed, in a pig incisional pain model...
2018: Journal of Pain Research
https://www.readbyqxmd.com/read/29670121/trpv1-sumoylation-regulates-nociceptive-signaling-in-models-of-inflammatory-pain
#15
Yan Wang, Yingwei Gao, Quan Tian, Qi Deng, Yangbo Wang, Tian Zhou, Qiang Liu, Kaidi Mei, Yingping Wang, Huiqing Liu, Ruining Ma, Yuqiang Ding, Weifang Rong, Jinke Cheng, Jing Yao, Tian-Le Xu, Michael X Zhu, Yong Li
Although TRPV1 channels represent a key player of noxious heat sensation, the precise mechanisms for thermal hyperalgesia remain unknown. We report here that conditional knockout of deSUMOylation enzyme, SENP1, in mouse dorsal root ganglion (DRG) neurons exacerbated thermal hyperalgesia in both carrageenan- and Complete Freund's adjuvant-induced inflammation models. TRPV1 is SUMOylated at a C-terminal Lys residue (K822), which specifically enhances the channel sensitivity to stimulation by heat, but not capsaicin, protons or voltage...
April 18, 2018: Nature Communications
https://www.readbyqxmd.com/read/29670003/stress-and-alterations-in-the-pain-matrix-a-biopsychosocial-perspective-on-back-pain-and-its-prevention-and-treatment
#16
Pia-Maria Wippert, Christine Wiebking
The genesis of chronic pain is explained by a biopsychosocial model. It hypothesizes an interdependency between environmental and genetic factors provoking aberrant long-term changes in biological and psychological regulatory systems. Physiological effects of psychological and physical stressors may play a crucial role in these maladaptive processes. Specifically, long-term demands on the stress response system may moderate central pain processing and influence descending serotonergic and noradrenergic signals from the brainstem, regulating nociceptive processing at the spinal level...
April 18, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29669562/comfort-in-palliative-sedation-compas-a-transdisciplinary-mixed-method-study-protocol-for-linking-objective-assessments-to-subjective-experiences
#17
Stefaan Six, Steven Laureys, Jan Poelaert, Johan Bilsen, Peter Theuns, Reginald Deschepper
BACKGROUND: In case of untreatable suffering at the end of life, palliative sedation may be chosen to assure comfort by reducing the patient's level of consciousness. An important question here is whether such sedated patients are completely free of pain. Because these patients cannot communicate anymore, caregivers have to rely on observation to assess the patient's comfort. Recently however, more sophisticated techniques from the neurosciences have shown that sometimes consciousness and pain are undetectable with these traditional behavioral methods...
April 18, 2018: BMC Palliative Care
https://www.readbyqxmd.com/read/29669091/a-mechanism-based-approach-to-physical-therapist-management-of-pain
#18
Ruth L Chimenti, Laura A Frey-Law, Kathleen A Sluka
Pain reduction is a primary goal of physical therapy for patients who present with acute or persistent pain conditions. The purpose of this review is to describe a mechanism-based approach to physical therapy pain management. It is increasingly clear that patients need to be evaluated for changes in peripheral tissues and nociceptors, neuropathic pain signs and symptoms, reduced central inhibition and enhanced central excitability, psychosocial factors, and alterations of the movement system. In this Perspective, 5 categories of pain mechanisms (nociceptive, central, neuropathic, psychosocial, and movement system) are defined, and principles on how to evaluate signs and symptoms for each mechanism are provided...
May 1, 2018: Physical Therapy
https://www.readbyqxmd.com/read/29667130/beneficial-effects-of-the-calcium-channel-blocker-ctk-01512-2-in-a-mouse-model-of-multiple-sclerosis
#19
Rodrigo B M Silva, Samuel Greggio, Gianina T Venturin, Jaderson C da Costa, Marcus V Gomez, Maria M Campos
Voltage-gated calcium channels (VGCCs) play a critical role in neuroinflammatory diseases, such as multiple sclerosis (MS). CTK 01512-2 is a recombinant version of the peptide Phα1β derived from the spider Phoneutria nigriventer, which inhibits N-type VGCC/TRPA1-mediated calcium influx. We investigated the effects of this molecule in the mouse model of experimental autoimmune encephalomyelitis (EAE). The effects of CTK 01512-2 were compared to those displayed by ziconotide-a selective N-type VGCC blocker clinically used for chronic pain-and fingolimod-a drug employed for MS treatment...
April 17, 2018: Molecular Neurobiology
https://www.readbyqxmd.com/read/29666400/the-corticosteroid-compounds-prednisolone-and-vamorolone-do-not-alter-the-nociception-phenotype-and-exacerbate-liver-injury-in-sickle-cell-mice
#20
Luis E F Almeida, Jesse M Damsker, Sarah Albani, Nina Afsar, Sayuri Kamimura, Drew Pratt, David E Kleiner, Martha Quezado, Heather Gordish-Dressman, Zenaide M N Quezado
Clinicians often hesitate prescribing corticosteroids to treat corticosteroid-responsive conditions in sickle cell disease (SCD) patients because their use can be associated with complications (increased hospital readmission, rebound pain, strokes, avascular necrosis, acute chest syndrome). Consequently, SCD patients may receive suboptimal treatment for corticosteroid-responsive conditions. We conducted a preclinical trial of dissociative (vamorolone) and conventional (prednisolone) corticosteroid compounds to evaluate their effects on nociception phenotype, inflammation, and organ dysfunction in SCD mice...
April 17, 2018: Scientific Reports
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