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Nociceptive pain

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https://www.readbyqxmd.com/read/29474665/catastrophizing-interferes-with-cognitive-modulation-of-pain-in-women-with-fibromyalgia
#1
Laura D Ellingson, Aaron J Stegner, Isaac J Schwabacher, Jacob B Lindheimer, Dane B Cook
Background: Pain modulation is a critical function of the nociceptive system that includes the ability to engage descending pain control systems to maintain a functional balance between facilitation and inhibition of incoming sensory stimuli. Dysfunctional pain modulation is associated with increased risk for chronic pain and is characteristic of fibromyalgia (FM). Catastrophizing is also common in FM. However, its influence on pain modulation is poorly understood. Objective: To determine the role of catastrophizing on central nervous system processing during pain modulation in FM via examining brain responses and pain sensitivity during an attention-distraction paradigm...
February 21, 2018: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/29473323/adult-spinal-opioid-receptor-%C3%A2%C2%B51-expression-after-incision-is-altered-by-early-life-repetitive-tactile-and-noxious-procedures-in-rats
#2
Nynke J van den Hoogen, Roel Ri van Reij, Jacob Patijn, Dick Tibboel, Elbert Aj Joosten
Clinical and experimental data suggests that noxious stimulation at critical stages of development results in long-term changes on nociceptive processing in later life. Here, we use an established, well-documented rat model of repetitive noxious procedures closely mimicking the clinical situation in the NICU. In order to understand molecular changes underlying the long-term consequences of repetitive stimulation of the developing nociceptive system the present study aims to analyse the presence of the µ-opioid-receptor-1 (OPRM1)...
February 22, 2018: Developmental Neurobiology
https://www.readbyqxmd.com/read/29472841/the-absence-of-sensory-axon-bifurcation-affects-nociception-and-termination-fields-of-afferents-in-the-spinal-cord
#3
Philip Tröster, Julia Haseleu, Jonas Petersen, Oliver Drees, Achim Schmidtko, Frederick Schwaller, Gary R Lewin, Gohar Ter-Avetisyan, York Winter, Stefanie Peters, Susanne Feil, Robert Feil, Fritz G Rathjen, Hannes Schmidt
A cGMP signaling cascade composed of C-type natriuretic peptide, the guanylyl cyclase receptor Npr2 and cGMP-dependent protein kinase I (cGKI) controls the bifurcation of sensory axons upon entering the spinal cord during embryonic development. However, the impact of axon bifurcation on sensory processing in adulthood remains poorly understood. To investigate the functional consequences of impaired axon bifurcation during adult stages we generated conditional mouse mutants of Npr2 and cGKI ( Npr2 fl / fl ;Wnt1 Cre and cGKI KO / fl ;Wnt1 Cre ) that lack sensory axon bifurcation in the absence of additional phenotypes observed in the global knockout mice...
2018: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/29470418/tetrodotoxin-a-candidate-drug-for-nav1-1-induced-mechanical-pain
#4
César Mattei
Tetrodotoxin (TTX), the mode of action of which has been known since the 1960s, is widely used in pharmacology as a specific inhibitor of voltage-gated sodium channels (Nav channels). This toxin has contributed to the characterization of the allosteric model of the Nav channel, and to discriminating TTX-sensitive and TTX-resistant subtypes. In addition to its role as a pharmacological tool, TTX is now considered a therapeutic molecule, and its development should lead to its use in certain pathologies involving Nav channels, particularly in the field of pain...
February 22, 2018: Marine Drugs
https://www.readbyqxmd.com/read/29469163/a-method-for-characterising-human-intervertebral-disc-glycosaminoglycan-disaccharides-using-liquid-chromatography-mass-spectrometry-with-multiple-reaction-monitoring
#5
X Liu, D Krishnamoorthy, L Lin, P Xue, F Zhang, L Chi, R J Linhardt, J C Iatridis
Intervertebral disc (IVD) degeneration results in the depletion of proteoglycans and glycosaminoglycans (GAGs), which can lead to structural and mechanical loss of IVD function, ingrowth of nociceptive nerve fibres and eventually discogenic pain. Specific GAG types as well as their disaccharide patterns can be predictive of disease and degeneration in several tissues but have not been comprehensively studied within the IVD. A highly sensitive mass spectrometry based technique with multiple reaction monitoring (MRM) was used to provide characterisation of chondroitin sulphate (CS), hyaluronic acid (HA), heparan sulphate (HS) and their disaccharide sulphation patterns across different anatomical regions of human IVDs...
February 22, 2018: European Cells & Materials
https://www.readbyqxmd.com/read/29468190/optogenetic-activation-of-non-nociceptive-a%C3%AE-fibers-induces-neuropathic-pain-like-sensory-and-emotional-behaviors-after-nerve-injury-in-rats
#6
Ryoichi Tashima, Keisuke Koga, Misuzu Sekine, Kensho Kanehisa, Yuta Kohro, Keiko Tominaga, Katsuyuki Matsushita, Hidetoshi Tozaki-Saitoh, Yugo Fukazawa, Kazuhide Inoue, Hiromu Yawo, Hidemasa Furue, Makoto Tsuda
Neuropathic pain is caused by peripheral nerve injury (PNI). One hallmark symptom is allodynia (pain caused by normally innocuous stimuli), but its mechanistic underpinning remains elusive. Notably, whether selective stimulation of non-nociceptive primary afferent Aβ fibers indeed evokes neuropathic pain-like sensory and emotional behaviors after PNI is unknown, because of the lack of tools to manipulate Aβ fiber function in awake, freely moving animals. In this study, we used a transgenic rat line that enables stimulation of non-nociceptive Aβ fibers by a light-activated channel (channelrhodopsin-2; ChR2)...
January 2018: ENeuro
https://www.readbyqxmd.com/read/29467671/tnf-%C3%AE-increases-production-of-reactive-oxygen-species-through-cdk5-activation-in-nociceptive-neurons
#7
Rodrigo Sandoval, Pablo Lazcano, Franco Ferrari, Nicolás Pinto-Pardo, Christian González-Billault, Elías Utreras
The participation of reactive oxygen species (ROS) generated by NOX1 and NOX2/NADPH oxidase has been documented during inflammatory pain. However, the molecular mechanism involved in their activation is not fully understood. We reported earlier a key role of Cyclin-dependent kinase 5 (Cdk5) during inflammatory pain. In particular, we demonstrated that TNF-α increased p35 expression, a Cdk5 activator, causing Cdk5-mediated TRPV1 phosphorylation followed by an increment in Ca2+ influx in nociceptive neurons and increased pain sensation...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29467623/eif4e-phosphorylation-influences-bdnf-mrna-translation-in-mouse-dorsal-root-ganglion-neurons
#8
Jamie K Moy, Arkady Khoutorsky, Marina N Asiedu, Gregory Dussor, Theodore J Price
Plasticity in dorsal root ganglion (DRG) neurons that promotes pain requires activity-dependent mRNA translation. Protein synthesis inhibitors block the ability of many pain-promoting molecules to enhance excitability in DRG neurons and attenuate behavioral signs of pain plasticity. In line with this, we have recently shown that phosphorylation of the 5' cap-binding protein, eIF4E, plays a pivotal role in plasticity of DRG nociceptors in models of hyperalgesic priming. However, mRNA targets of eIF4E phosphorylation have not been elucidated in the DRG...
2018: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/29463997/targeting-aldh2-for-therapeutic-interventions-in-chronic-pain-related-myocardial-ischemic-susceptibility
#9
Chen Li, Wanqing Sun, Chunhu Gu, Zheng Yang, Nanhu Quan, Jingrun Yang, Zhaoling Shi, Lu Yu, Heng Ma
Clinical observations have demonstrated a link between chronic pain and increased ischemic heart disease mortality, but the mechanisms remain elusive. Reactive aldehydes have recently been confirmed as a new player in pain pathologies, while our previous study demonstrated that reactive aldehydes (4-HNE) induced carbonyl stress contributing to myocardial ischemic intolerance. The aim of this study was to explore whether chronic pain increases susceptibility to myocardial ischemia/reperfusion (MI/R) injury and to investigate the underlying mechanisms focusing on toxic aldehyde and carbonyl stress...
2018: Theranostics
https://www.readbyqxmd.com/read/29462700/eugenia-brasiliensis-leaves-extract-attenuates-visceral-and-somatic-inflammatory-pain-in-mice
#10
Róli R Simões, Scheila I Kraus, Igor S Coelho, Daniela Dal-Secco, Diogo A Siebert, Gustavo A Micke, Michele D Alberton, Adair R S Santos
ETHNOPHARMACOLOGICAL RELEVANCE: Eugenia brasiliensis Lam. (Myrtaceae) is a Brazilian tree distributed throughout Atlantic rain forest, since Bahia until Santa Catarina state, and is popularly known as "grumixaba, grumixameira, cumbixaba, ibaporoiti, and cereja-brasileira". The bark and leaves of Eugenia brasiliensis are used in folk medicine as adstringent, diuretic, energizing, anti-rheumatic and anti-inflammatory. This study aimed at investigating the chemical composition, antinociceptive and anti-inflammatory effect of the hydroalcoholic extract of Eugenia brasiliensis (HEEb)...
February 17, 2018: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29461336/sex-differences-in-antinociceptive-response-to-%C3%AE-9-tetrahydrocannabinol-and-cp-55-940-in-the-mouse-formalin-test
#11
Rebecca A LaFleur, Ronald P Wilson, Daniel J Morgan, Angela N Henderson-Redmond
Cannabinoids have shown promise for the treatment of intractable pain states and may represent an alternative pharmacotherapy for pain management. A growing body of clinical evidence suggests a role for sex in pain perception and in cannabinoid response. We examined cannabinoid sensitivity and tolerance in male and female mice expressing a desensitization-resistant form (S426A/S430A) of the cannabinoid type 1 receptor (CB1R). Mice were assessed for acute and inflammatory nociceptive behaviors in the formalin test following pretreatment with either vehicle or mixed CB1R/CB2R agonists, Δ-9-tetrahydrocannabinol ([INCREMENT]-THC) (1-6 mg/kg) or CP 55,940 (0...
February 15, 2018: Neuroreport
https://www.readbyqxmd.com/read/29461271/endothelin-signaling-contributes-to-modulation-of-nociception-in-early-stage-tongue-cancer-in-rats
#12
Akihiko Furukawa, Masamichi Shinoda, Asako Kubo, Kuniya Honda, Ryuta Akasaka, Yoshiyuki Yonehara, Koichi Iwata
BACKGROUND: Patients with early stage tongue cancer do not frequently complain of tongue pain. Endothelin-1 signaling is upregulated in the cancerous tongue at the early stage. We tested the hypothesis that endothelin-1 signaling contributes to the modulation of tongue nociception. METHODS: Squamous cell carcinoma cells were inoculated into the tongue under general anesthesia. Lingual mechanical sensitivity under light anesthesia using forceps from days 1 to 21 (n = 8) and the amounts of endothelin-1 and β-endorphin in the tongue on days 6, 14, and 21 (n = 5 to 7) were examined after the inoculation...
February 15, 2018: Anesthesiology
https://www.readbyqxmd.com/read/29460296/an-exploratory-analysis-of-the-influence-of-personality-and-emotional-factors-on-cerebral-blood-flow-responses-during-painful-stimulation-in-fibromyalgia
#13
Casandra I Montoro Aguilar, Stefan Duschek, Gustavo A Reyes Del Paso
This study explored the influence of certain personality traits (neuroticism, extraversion, psychoticism, alexithymia), emotional variables (depression, catastrophizing), and insomnia on cerebral blood flow (CBF) responses to painful stimulation in fibromyalgia, using functional transcranial Doppler sonography. CBF velocities were recorded bilaterally in the anterior cerebral arteries (ACA) and middle cerebral arteries (MCA) of 24 fibromyalgia patients during exposure to two painful pressure conditions: (1) fixed pressure (2...
February 19, 2018: Scandinavian Journal of Psychology
https://www.readbyqxmd.com/read/29460077/orofacial-antinociceptive-effect-of-sulphated-polysaccharide-from-the-marine-algae-hypnea-pseudomusciformis-in-rodents
#14
Caio Átila Prata Bezerra Souza, Breytiner Amaro de Oliveira, Sacha Aubrey Alves Rodrigues Santos, Francisco Lucas Alves Batista, Francisco Regivânio Nascimento Andrade, Eugênio Januário Ramos Neto, José de Maria Albuquerque de Melo Júnior, Francisco Rogenio da Silva Mendes, Lana Karine Vasconcelos Barroso, Kirley Marques Canuto, Francisco Ernani Alves Magalhães, Angelo Roncalli Alves E Silva, Wladimir Ronald Lobo Farias, Adriana Rolim Campos
This study aimed to evaluate the antinociceptive effect of sulphated polysaccharide from the marine algae Hypnea pseudomusciformis (PLS) using rodent models of orofacial pain. Acute pain was induced by formalin, capsaicin, cinnamaldehyde, acidified saline or glutamate (cutaneous modes) and hypertonic saline (corneal model). In one experiment, animals were pretreated with ruthenium red, glibenclamide, naloxone, L-NAME, methylene blue or ketamine to investigate the mechanism of antinociception. In another experiment, animals pretreated with PLS or saline were submitted to the temporomandibular joint formalin test...
February 19, 2018: Inflammopharmacology
https://www.readbyqxmd.com/read/29459435/membrane-cholesterol-depletion-as-a-trigger-of-nav1-9-channel-mediated-inflammatory-pain
#15
Muriel Amsalem, Corinne Poilbout, Géraldine Ferracci, Patrick Delmas, Francoise Padilla
Cholesterol is a major lipid component of the mammalian plasma membrane. While much is known about its metabolism, its transport, and its role in atherosclerotic vascular disease, less is known about its role in neuronal pathophysiology. This study reveals an unexpected function of cholesterol in controlling pain transmission. We show that inflammation lowers cholesterol content in skin tissue and sensory DRG culture. Pharmacological depletion of cellular cholesterol entails sensitization of nociceptive neurons and promotes mechanical and thermal hyperalgesia through the activation of voltage-gated Nav1...
February 19, 2018: EMBO Journal
https://www.readbyqxmd.com/read/29451306/supraspinal-modulation-of-neuronal-synchronization-by-nociceptive-stimulation-induces-an-enduring-reorganization-of-dorsal-horn-neuronal-connectivity
#16
E Contreras-Hernández, D Chávez, E Hernández, E Velázquez, P Reyes, J Bejar, M Martín, U Cortés, S Glusman, P Rudomin
Despite the profuse information on the molecular and cellular mechanisms involved in the central sensitization produced by intense nociceptive stimulation, the changes in the patterns of functional connectivity between spinal neurones associated with the development of secondary hyperalgesia and allodynia remain largely unknown. Here we show that the state of central sensitization produced by the intradermal injection of capsaicin is associated with structured transformations in neuronal synchronization that lead to an enduring reorganization of the functional connectivity within a segmentally distributed ensemble of dorsal horn neurones...
February 16, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29450258/the-cannabinoids-%C3%AE-8-thc-cbd-and-hu-308-act-via-distinct-receptors-to-reduce-corneal-pain-and-inflammation
#17
Dinesh Thapa, Elizabeth A Cairns, Anna-Maria Szczesniak, James T Toguri, Meggie D Caldwell, Melanie E M Kelly
Background and Purpose: Corneal injury can result in dysfunction of corneal nociceptive signaling and corneal sensitization. Activation of the endocannabinoid system has been reported to be analgesic and anti-inflammatory. The purpose of this research was to investigate the antinociceptive and anti-inflammatory effects of cannabinoids with reported actions at cannabinoid 1 (CB 1 R) and cannabinoid 2 (CB 2 R) receptors and/or noncannabinoid receptors in an experimental model of corneal hyperalgesia. Methods: Corneal hyperalgesia (increased pain response) was generated using chemical cauterization of the corneal epithelium in wild-type (WT) and CB 2 R knockout (CB 2 R -/- ) mice...
2018: Cannabis and Cannabinoid Research
https://www.readbyqxmd.com/read/29449064/pain-related-psychological-issues-in-hand-therapy
#18
Tokiko Hamasaki, René Pelletier, Daniel Bourbonnais, Patrick Harris, Manon Choinière
STUDY DESIGN: Literature review. INTRODUCTION: Pain is a subjective experience that results from the modulation of nociception conveyed to the brain via the nervous system. Perception of pain takes place when potential or actual noxious stimuli are appraised as threats of injury. This appraisal is influenced by one's cognitions and emotions based on her/his pain-related experiences, which are processed in the forebrain and limbic areas of the brain. Unarguably, patients' psychological factors such as cognitions (eg, pain catastrophizing), emotions (eg, depression), and pain-related behaviors (eg, avoidance) can influence perceived pain intensity, disability, and treatment outcomes...
February 12, 2018: Journal of Hand Therapy: Official Journal of the American Society of Hand Therapists
https://www.readbyqxmd.com/read/29447138/inflammation-in-the-pathophysiology-of-neuropathic-pain
#19
Claudia Sommer, Mathias Leinders, Nurcan Üçeyler
Peripheral nerve injuries and diseases often lead to pain persisting beyond the resolution of damage, indicating an active disease-promoting process, which may result in chronic pain. This is regarded as a maladaptive mechanism resulting from neuroinflammation that originally serves to promote regeneration and healing. Knowledge on these physiological and pathophysiological processes has accumulated over the last few decades and has started to yield potential therapeutic targets. Key players are macrophages, T-lymphocytes, cytokines, and chemokines...
March 2018: Pain
https://www.readbyqxmd.com/read/29447134/histone-deacetylase-5-hdac5-regulates-neuropathic-pain-through-sry-related-hmg-box-10-sox10-dependent-mechanism-in-mice
#20
Pan Gu, Zhiqiang Pan, Xiao-Min Wang, Liting Sun, Lydia Wai Tai, Chi Wai Cheung
A strong link between histone deacetylases (HDACs) and nociceptive hypersensitivity has been indicated in different pain models. However, the underlying molecular and cellular mechanisms remain elusive. Here, we discovered that partial sciatic nerve ligation-induced mechanical allodynia and thermal hyperalgesia in mice were associated with increased mRNA and protein expressions of HDAC5 (a member of class IIa HDACs) and SRY-related HMG-box 10 (SOX10) in the ipsilateral lumbar dorsal horn. Gene knockdown of spinal HDAC5 or SOX10 attenuated partial sciatic nerve ligation-induced nociceptive hypersensitivity, companied with decrease of spinal neuronal sensitization markers, namely phosphorylated-Erk, phosphorylated-GluN1 (ser896), and c-Fos...
March 2018: Pain
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