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Conditioned pain modulation

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https://www.readbyqxmd.com/read/29234141/cannabinoid-type-2-receptors-in-dopamine-neurons-inhibits-psychomotor-behaviors-alters-anxiety-depression-and-alcohol-preference
#1
Qing-Rong Liu, Ana Canseco-Alba, Hai-Ying Zhang, Patricia Tagliaferro, Monika Chung, Eugene Dennis, Branden Sanabria, Norman Schanz, Joao Carlos Escosteguy-Neto, Hiroki Ishiguro, Zhicheng Lin, Susan Sgro, Claire M Leonard, Jair Guilherme Santos-Junior, Eliot L Gardner, Josephine M Egan, Jeung Woon Lee, Zheng-Xiong Xi, Emmanuel S Onaivi
Cannabinoid CB2 receptors (CB2Rs) are expressed in mouse brain dopamine (DA) neurons and are involved in several DA-related disorders. However, the cell type-specific mechanisms are unclear since the CB2R gene knockout mice are constitutive gene knockout. Therefore, we generated Cnr2-floxed mice that were crossed with DAT-Cre mice, in which Cre- recombinase expression is under dopamine transporter gene (DAT) promoter control to ablate Cnr2 gene in midbrain DA neurons of DAT-Cnr2 conditional knockout (cKO) mice...
December 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29229703/orai1-plays-a-crucial-role-in-central-sensitization-by-modulating-neuronal-excitability
#2
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/29229214/targeting-cytokines-for-treatment-of-neuropathic-pain
#3
REVIEW
Alice L Hung, Michael Lim, Tina L Doshi
BACKGROUND: Neuropathic pain is a challenging condition often refractory to existing therapies. An increasing number of studies have indicated that the immune system plays a crucial role in the mediation of neuropathic pain. Exploration of the various functions of individual cytokines in neuropathic pain will provide greater insight into the mechanisms of neuropathic pain and suggest potential opportunities to expand the repertoire of treatment options. METHODS: A literature review was performed to assess the role of pro-inflammatory and anti-inflammatory cytokines in the development of neuropathic pain...
October 2017: Scandinavian Journal of Pain
https://www.readbyqxmd.com/read/29223397/-borneol-suppresses-conditioned-fear-recall-and-anxiety-like-behaviors-in-mice
#4
Bo Cao, Huan-Yu Ni, Jun Li, Ying Zhou, Xin-Lan Bian, Yan Tao, Cheng-Yun Cai, Cheng Qin, Hai-Yin Wu, Lei Chang, Chun-Xia Luo, Dong-Ya Zhu
Fear- and anxiety-related psychiatric disorders have been one of the major chronic diseases afflicting patients for decades, and new compounds for treating such disorders remain to be developed. (+)-Borneol, a bicyclic monoterpene found in several species of Artemisia and Dipterocarpaceae, is widely used for anxiety, pain and anesthesia in Chinese medicine. Meanwhile, it can potentiate GABA (γ-aminobutyric acid) activity directly in recombinant GABAA receptors. The present study was to investigate the effects of (+)-Borneol on both contextual and cued fear recall...
December 6, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29222851/convergent-validity-of-the-dutch-central-sensitization-inventory-associations-with-psychophysical-pain-measures-quality-of-life-disability-and-pain-cognitions-in-patients-with-chronic-spinal-pain
#5
Jeroen Kregel, Charline Schumacher, Mieke Dolphens, Anneleen Malfliet, Dorien Goubert, Dorine Lenoir, Barbara Cagnie, Mira Meeus, I Coppieters
OBJECTIVE: Symptoms of Central Sensitization (CS) have been described in patients with chronic spinal pain (CSP). Although a gold standard to diagnose CS is lacking, psychophysical pain measures are often used. The Central Sensitization Inventory (CSI) is proposed as an alternative method and indirect tool for evaluation of CS symptomatology. The aim of the current study was to evaluate the convergent validity of the CSI by investigating the association with psychophysical pain measures and self-reported measures of current pain intensity, quality of life, disability, and catastrophizing in CSP patients...
December 8, 2017: Pain Practice: the Official Journal of World Institute of Pain
https://www.readbyqxmd.com/read/29220355/adults-with-patellofemoral-pain-do-not-exhibit-manifestations-of-peripheral-and-central-sensitization-when-compared-to-healthy-pain-free-age-and-sex-matched-controls-an-assessor-blinded-cross-sectional-study
#6
Michael Skovdal Rathleff, Camilla Rams Rathleff, Aoife Stephenson, Rebecca Mellor, Mark Matthews, Kay Crossley, Bill Vicenzino
Patellofemoral Pain (PFP) is highly prevalent among adults and adolescents. Localized mechanical hyperalgesia around the knee and tibialis anterior have been observed in people with PFP, but limited knowledge of potential manifestations of central sensitisation exists. The aims of this study were to study conditioned pain modulation (CPM) and wide-spread hyperalgesia in adults with PFP. This assessor-blinded cross-sectional study design compared CPM and mechanical pressure pain thresholds (PPT) between 33 adults (23 females) diagnosed with PFP and 32 age and sex matched pain-free controls...
2017: PloS One
https://www.readbyqxmd.com/read/29213232/stress-induced-chronic-visceral-pain-of-gastrointestinal-origin
#7
REVIEW
Beverley Greenwood-Van Meerveld, Anthony C Johnson
Visceral pain is generally poorly localized and characterized by hypersensitivity to a stimulus such as organ distension. In concert with chronic visceral pain, there is a high comorbidity with stress-related psychiatric disorders including anxiety and depression. The mechanisms linking visceral pain with these overlapping comorbidities remain to be elucidated. Evidence suggests that long term stress facilitates pain perception and sensitizes pain pathways, leading to a feed-forward cycle promoting chronic visceral pain disorders such as irritable bowel syndrome (IBS)...
2017: Frontiers in Systems Neuroscience
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/29209250/mental-simulation-of-painful-situations-has-an-impact-on-posture-and-psychophysiological-parameters
#9
Thierry Lelard, Olivier Godefroy, Said Ahmaidi, Pierre Krystkowiak, Harold Mouras
Embodiment is made possible by the ability to imagine ourselves in a particular situation (mental simulation). Postural changes have been demonstrated in response to painful situations, but the effect of an implicit instruction has not been studied. The present study was designed to record differential responses according to whether or not subjects were instructed to imagine themselves in a painful or non-painful situation. Painful stimuli and instructions to mentally simulate the displayed situation were hypothesized to induce postural changes that could be demonstrated by changes in the center of pressure (COP) trajectory compared to viewing the same stimuli with no instructions...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/29209204/reward-circuitry-plasticity-in-pain-perception-and-modulation
#10
REVIEW
Marcos F DosSantos, Brenda de Souza Moura, Alexandre F DaSilva
Although pain is a widely known phenomenon and an important clinical symptom that occurs in numerous diseases, its mechanisms are still barely understood. Owing to the scarce information concerning its pathophysiology, particularly what is involved in the transition from an acute state to a chronic condition, pain treatment is frequently unsatisfactory, therefore contributing to the amplification of the chronic pain burden. In fact, pain is an extremely complex experience that demands the recruitment of an intricate set of central nervous system components...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29201643/relationships-between-brain-metabolite-levels-functional-connectivity-and-negative-mood-in-urologic-chronic-pelvic-pain-syndrome-patients-compared-to-controls-a-mapp-research-network-study
#11
Daniel E Harper, Eric Ichesco, Andrew Schrepf, Megan Halvorson, Tudor Puiu, Daniel J Clauw, Richard E Harris, Steven E Harte
Until recently, the predominant pathology of chronic pelvic pain conditions was thought to reside in the peripheral tissues. However, mounting evidence from neuroimaging studies suggests an important role of the central nervous system in the pathogenesis of these conditions. In the present cross-sectional study, proton magnetic resonance spectroscopy (1H-MRS) of the brain was conducted in female patients with urologic chronic pelvic pain syndrome (UCPPS) to determine if they exhibit abnormal concentrations of brain metabolites (e...
2018: NeuroImage: Clinical
https://www.readbyqxmd.com/read/29196870/changes-in-birth-related-pain-perception-impact-of-neurobiological-and-psycho-social-factors
#12
Sebastian Berlit, Stefanie Lis, Katharina Häfner, Nikolaus Kleindienst, Ulf Baumgärtner, Rolf-Detlef Treede, Marc Sütterlin, Christian Schmahl
PURPOSE: To analyse post-partum short- and long-term pain sensitivity and the influence of endogenous pain inhibition as well as distinct psycho-social factors on birth-related pain. METHODS: Pain sensitivity was assessed in 91 primiparous women at three times: 2-6 weeks before, one to 3 days as well as ten to 14 weeks after childbirth. Application of a pressure algometer in combination with a cold pressor test was utilised for measurement of pain sensitivity and assessment of conditioned pain modulation (CPM)...
December 1, 2017: Archives of Gynecology and Obstetrics
https://www.readbyqxmd.com/read/29194773/plasma-il-8-signature-correlates-with-pain-and-depressive-symptomatology-in-patients-with-burning-mouth-syndrome-results-from-a-pilot-study
#13
Alison Barry, Ken D O'Halloran, Joseph P McKenna, Christine McCreary, Eric J Downer
BACKGROUND: Burning mouth syndrome (BMS) is a neuropathic orofacial pain condition of unknown aetiology that encompasses intra-oral burning pain without abnormal clinical findings. Psychological, neural and inflammatory processes are associated with BMS pathogenesis. Currently, studies characterising plasma cytokine/chemokine profiles with pain and depression in BMS patients are lacking. Considering that inflammation is associated with the pathophysiology of BMS, and that inflammation is closely associated with pain and depression, we aimed to correlate depressive symptomatology and oral cavity pain with plasma cytokine/chemokine signatures in a cohort of patients with BMS...
December 1, 2017: Journal of Oral Pathology & Medicine
https://www.readbyqxmd.com/read/29191774/endogenous-pain-modulation-induced-by-extrinsic-and-intrinsic-psychological-threat-in-healthy-individuals
#14
William Gibson, Penny Moss, Tak Ho Cheng, Alexandre Garnier, Anthony Wright, Benedict M Wand
Many factors interact to influence threat perception and the subsequent experience of pain. This study investigated the impact of observing pain (extrinsic threat) and intrinsic threat of pain to oneself on pressure pain threshold (PPT). Forty socially-connected pairs of healthy volunteers were threat-primed and randomly allocated to experimental or control roles. An experimental pain modulation paradigm was applied, with non-nociceptive threat cues used as conditioning stimuli. In sub-study 1, the extrinsic threat to the experimental participant was observation of the control partner in pain...
November 27, 2017: Journal of Pain: Official Journal of the American Pain Society
https://www.readbyqxmd.com/read/29190741/preoperative-transcranial-direct-current-stimulation-exploration-of-a-novel-strategy-to-enhance-neuroplasticity-before-surgery-to-control-postoperative-pain-a-randomized-sham-controlled-study
#15
Hugo Ribeiro, Ricardo Bertol Sesterhenn, Andressa de Souza, Ana Claudia de Souza, Monique Alves, Jessica Catarina Machado, Nathalia Bofill Burger, Iraci Lucena da Silva Torres, Luciana Cadore Stefani, Felipe Fregni, Wolnei Caumo
BACKGROUND: An imbalance in the excitatory/inhibitory systems in the pain networks may explain the persistent chronic pain after hallux valgus surgery. Thus, to contra-regulate this dysfunction, the use of transcranial direct current stimulation (tDCS) becomes attractive. OBJECTIVE: We tested the hypothesis that two preoperative active(a)-tDCS sessions compared with sham(s)-tDCS could improve the postoperative pain [as indexed by Visual Analogue Scale (VAS) at rest and during walking (primary outcomes)]...
2017: PloS One
https://www.readbyqxmd.com/read/29188558/breakthrough-in-gpcr-crystallography-and-its-impact-on-computer-aided-drug-design
#16
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/29185963/the-therapeutic-nuclear-magnetic-resonance-changes-the-balance-in-intracellular-calcium-and-reduces-the-interleukin-1%C3%AE-induced-increase-of-nf-%C3%AE%C2%BAb-activity-in-chondrocytes
#17
Bibiane Steinecker-Frohnwieser, Werner Kullich, Anda Mann, Hans Georg Kress, Lukas Weigl
OBJECTIVES: Osteoarthritis as the main chronic joint disease is characterised by the destruction of articular cartilage. Developing new, more effective and in particular non-invasive methods to achieve pain reduction of OA patients are of exceptional interest. Clinical observations demonstrated positive effects of therapeutically applied low nuclear magnetic resonance (NMRT) for the treatment of painful disorders of the musculoskeletal system. In this study the cellular mechanism of action of NMRT was examined on chondrocytes...
November 28, 2017: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/29182051/what-role-does-multiple-sclerosis-play-in-the-development-of-untreatable-painful-conditions
#18
Stefania Ceruti
Clinical data outline the high incidence of pain syndromes in patients with multiple sclerosis, with a significant prevalence of craniofacial manifestations, including trigeminal neuralgia and migraine, which are very difficult to be managed pharmacologically. The common explanation of a localization of demyelinating plaques in areas devoted to pain modulation and integration as a trigger for pain development seems now partially unsatisfactory, since pain is often manifested well before the clinical signs of the pathology and its severity does not correlate with disease progression...
November 28, 2017: Pain Management
https://www.readbyqxmd.com/read/29180893/identification-of-key-genes-and-pathways-associated-with-neuropathic-pain-in-uninjured-dorsal-root-ganglion-by-using-bioinformatic-analysis
#19
Chao-Jin Chen, De-Zhao Liu, Wei-Feng Yao, Yu Gu, Fei Huang, Zi-Qing Hei, Xiang Li
Purpose: Neuropathic pain is a complex chronic condition occurring post-nervous system damage. The transcriptional reprogramming of injured dorsal root ganglia (DRGs) drives neuropathic pain. However, few comparative analyses using high-throughput platforms have investigated uninjured DRG in neuropathic pain, and potential interactions among differentially expressed genes (DEGs) and pathways were not taken into consideration. The aim of this study was to identify changes in genes and pathways associated with neuropathic pain in uninjured L4 DRG after L5 spinal nerve ligation (SNL) by using bioinformatic analysis...
2017: Journal of Pain Research
https://www.readbyqxmd.com/read/29180892/does-self-perception-of-sensitivity-to-pain-correlate-with-actual-sensitivity-to-experimental-pain
#20
Doron Meiselles, Joshua Aviram, Erica Suzan, Dorit Pud, Elon Eisenberg
Background: People often state that they are "sensitive" or "insensitive" to pain. However, the accuracy and clinical relevance of such statements is unclear. Objective: The aim of this study was to search for associations between self-perception of sensitivity to pain and experimental pain measures, including known psychophysical inhibitory or excitatory pain paradigms. Subjects and methods: Subjective sensitivity to pain was reported by 75 healthy participants and included three self-perceived variables: pain threshold, pain sensitivity and pain intensity in response to a hypothetical painful event (hypothetical pain intensity [HPI])...
2017: Journal of Pain Research
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