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https://www.readbyqxmd.com/read/28731982/peripheral-oxytocin-receptors-inhibit-the-nociceptive-input-signal-to-spinal-dorsal-horn-wide-dynamic-range-neurons
#1
Abimael González-Hernández, Alfredo Manzano-García, Guadalupe Martínez-Lorenzana, Irma A Tello-García, Martha Carranza, Carlos Arámburo, Miguel Condés-Lara
Oxytocin has emerged as a mediator of endogenous analgesia in behavioral and electrophysiological experiments. In fact, oxytocin receptors (OTRs) in the spinal dorsal horn participate in a selective inhibition of the neuronal activity mediated by Aδ- and C-fibers but not Aβ-fibers. This study shows that OTRs are expressed in the terminal nerve endings and are able to inhibit nociceptive neuronal firing. Indeed, local peripheral oxytocin blocked the first sensorial activity Aδ- and C-fibers recorded in the spinal cord neurons...
July 19, 2017: Pain
https://www.readbyqxmd.com/read/28708766/is-the-rationale-more-important-than-deception-a-randomized-controlled-trial-of-openlabel-placebo-analgesia
#2
Cosima Locher, Antje Frey Nascimento, Irving Kirsch, Joe Kossowsky, Andrea Meyer, Jens Gaab
Research on open-label placebos questions whether deception is a necessary characteristic of placebo effects. Yet, comparisons between open-label and deceptive placebos are lacking. We therefore assessed effects of open-label and deceptive placebos in comparison to no treatment with a standardized experimental heat pain paradigm in a RCT in healthy participants. Participants (N = 160) were randomly assigned to no treatment (NT), open-label placebo without rationale (OPR-), open-label placebo with rationale (OPR+) and deceptive placebo (DP)...
July 12, 2017: Pain
https://www.readbyqxmd.com/read/28708765/distinct-behavioral-responses-evoked-by-selective-optogenetic-stimulation-of-the-major-trpv1-and-mrgd-subsets-of-c-fibers
#3
Hélène Beaudry, Ihab Daou, Ariel R Ase, Alfredo Ribeiro-da-Silva, Philippe Séguéla
Primary C-fiber nociceptors are broadly divided into peptidergic and non-peptidergic afferents. TRPV1 is a thermosensitive cation channel mainly localized in peptidergic nociceptors whereas MrgD is a sensory G protein-coupled receptor expressed in most non-peptidergic nociceptive afferents. TRPV1 and MrgD fibers have been reported to be primarily involved in thermal and mechanical nociception, respectively. Yet, their functional assessment in somatosensory transmission relied on ablation strategies that do not account for compensatory mechanisms...
July 12, 2017: Pain
https://www.readbyqxmd.com/read/28708764/in-memoriam-professor-stephen-j-morley-1950-2017
#4
Johan W Vlaeyen, Francis J Keefe, Chris J Main, Christopher Eccleston, Amanda C de C Williams
No abstract text is available yet for this article.
July 11, 2017: Pain
https://www.readbyqxmd.com/read/28708763/day-to-day-experience-in-resolution-of-pain-after-surgery
#5
Timothy T Houle, Scott Miller, Jason E Lang, Jessica L Booth, Regina S Curry, Lynnette Harris, Carol A Aschenbrenner, James C Eisenach
We know little about the individual pain experience of patients recovering from surgery in the first weeks after hospital discharge. Here we examine individual differences in the day-to-day experience after two major surgeries: lower limb total major joint arthroplasty (TJA) and cesarean delivery (CD). Fifty-five TJA patients and 157 CD patients were recruited to complete questionnaires and record their daily pain experiences after surgery. After hospital discharge, patients recorded their pain intensity once daily for 60 days (CD) or twice daily for 2 weeks, once daily for two weeks, weekly for 8 weeks and monthly for 3 months (TJA)...
July 11, 2017: Pain
https://www.readbyqxmd.com/read/28708762/cognitive-load-selectively-influences-the-interruptive-effect-of-pain-on-attention
#6
David J Moore, Christopher Eccleston, Edmund Keogh
Pain is known to interrupt attentional performance. Such interference effects seem to occur preferentially for tasks that are complex and/or difficult. However, few studies have directly manipulated memory load in the context of pain interference to test this view. Therefore, the present study examines the effect of experimental manipulations of both memory load and pain on three tasks previously found to be sensitive to pain interference. Three experiments were conducted. A different task was examined in each experiment, each comprising of a high and low cognitive load versions of the task...
July 11, 2017: Pain
https://www.readbyqxmd.com/read/28708761/most-red-flags-for-malignancy-in-low-back-pain-guidelines-lack-empirical-support-a-systematic-review
#7
Arianne P Verhagen, Aron Downie, Chris G Maher, Bart W Koes
Clinicians do not want to miss underlying serious pathology, but it is still unclear which red flags are relevant. We aimed to evaluate the origin and evidence on diagnostic accuracy of red flags for malignancy for the management of low back pain in primary care. We performed a comprehensive overview, and searched the literature using snowballing techniques and reference checking for evidence on red flags endorsed in clinical guidelines for identifying patients with higher likelihood of malignancy. We selected studies including people with low back pain without any restriction on study design...
July 11, 2017: Pain
https://www.readbyqxmd.com/read/28708760/reactive-oxygen-species-affect-spinal-cell-type-specific-synaptic-plasticity-in-a-model-of-neuropathic-pain
#8
Alice Bittar, Jaebeom Jun, Jun-Ho La, Jigong Wang, Joong Woo Leem, Jin Mo Chung
Spinal synaptic plasticity is believed to drive central sensitization that underlies the persistent nature of neuropathic pain. Our recent data showed that synaptic plasticity in the dorsal horn is cell type-specific: intense afferent stimulation produced long-term potentiation (LTP) in excitatory spinothalamic tract neurons (STTn), whereas it produced long-term depression (LTD) in inhibitory GABAergic interneurons (GABAn). In addition, reactive oxygen species (ROS) were shown to be involved in LTP in STTn (STTn-LTP) as well as in LTD in GABAn (GABAn-LTD)...
July 11, 2017: Pain
https://www.readbyqxmd.com/read/28708759/long-noncoding-rna-mrak009713-is-a-novel-regulator-of-neuropathic-pain-in-rats
#9
Guilin Li, Huaide Jiang, Chaoran Zheng, Gaochun Zhu, Yurong Xu, Xuan Sheng, Bing Wu, Jingjing Guo, Shuanghua Zhu, Yuting Zhan, Weijian Lin, Rui Ding, Chunping Zhang, Shuangmei Liu, Lifang Zou, Zhihua Yi, Shangdong Liang
Long noncoding RNAs (lncRNAs) have been implicated in neuropathy. Here we identify and validate an lncRNA, MRAK009713, as a primary regulator of neuropathic pain in chronic constriction injury (CCI) rats. MRAK009713 expression was markedly increased in CCI rats associated with enhanced pain behaviors and small interfering RNA (siRNA) against MRAK009713 significantly reduced both mechanical and thermal hyperalgesia in the CCI rats. MRAK009713 is predicted to interact with the nociceptive P2X3 receptor by CatRAPID, a bioinformatics technology...
July 11, 2017: Pain
https://www.readbyqxmd.com/read/28700539/propranolol-treatment-prevents-chronic-central-sensitization-induced-by-repeated-dural-stimulation
#10
Nelly Boyer, Jérémy Signoret-Genest, Alain Artola, Radhouane Dallel, Lénaïc Monconduit
Migraine is currently conceptualized as a chronic disease with episodic manifestations. In some patients, migraine attack frequency increases, leading to chronic migraine. Daily preventive therapy is initiated to decrease attack frequency. Propranolol, a first-line medication for migraine prophylaxis, reduces attack frequency in nearly 50% of patients receiving it. However, the mechanisms of its antimigraine action are unclear. We examined the effect of daily propranolol treatment (10 mg.kg per os, 8 days) in a rat model of recurrent activation of dural nociceptors (repeated infusion of an inflammatory soup (IS) on the dura through a cannula every 2-3 days)...
July 8, 2017: Pain
https://www.readbyqxmd.com/read/28700538/autonomic-responses-to-tonic-pain-are-more-closely-related-to-stimulus-intensity-than-to-pain-intensity
#11
Moritz M Nickel, Elisabeth S May, Laura Tiemann, Martina Postorino, Son Ta Dinh, Markus Ploner
Pain serves the protection of the body by translating noxious stimulus information into a subjective percept and protective responses. Such protective responses rely on autonomic responses which allocate energy resources to protective functions. However, the precise relationship between objective stimulus intensity, subjective pain intensity, autonomic responses and brain activity is not fully clear yet. Here, we addressed this question by continuously recording pain ratings, skin conductance, heart rate and electroencephalography during tonic noxious heat stimulation of the hand in 39 healthy human subjects...
July 8, 2017: Pain
https://www.readbyqxmd.com/read/28700537/qst-response-patterns-to-capsaicin-and-uv-b-induced-local-skin-hypersensitization-in-healthy-subjects-a-machine-learned-analysis
#12
Jörn Lötsch, Gerd Geisslinger, Sarah Heinemann, Florian Lerch, Bruno G Oertel, Alfred Ultsch
The comprehensive assessment of pain-related human phenotypes requires combinations of nociceptive measures that produce complex high-dimensional data, posing challenges to bioinformatic analysis. In this study, we assessed established experimental models of heat hyperalgesia of the skin, consisting of local ultraviolet-B (UV-B) irradiation or capsaicin application, in 82 healthy subjects using a variety of noxious stimuli. We extended the original heat simulation by applying cold and mechanical stimuli and assessing the hypersensitization effects with a clinically established quantitative sensory testing (QST) battery (German Research Network on Neuropathic Pain)...
July 8, 2017: Pain
https://www.readbyqxmd.com/read/28683025/visceral-pain-as-a-triggering-factor-for-fibromyalgia-symptoms-in-comorbid-patients
#13
Raffaele Costantini, Giannapia Affaitati, Ursula Wesselmann, Peter Czakanski, Maria Adele Giamberardino
Fibromyalgia (FMS) is a central sensitization syndrome, however peripheral pain sources potentially exacerbate its symptoms of chronic diffuse musculoskeletal pain and hyperalgesia. This prospective study evaluated visceral pain as a possible triggering factor for FMS pain/hyperalgesia in comorbid patients. Women with: a) FMS+irritable bowel syndrome (IBS); b) FMS+primary dysmenorrhea (Dys); c) FMS+dysmenorrhea secondary to endometriosis (Endo); d) FMS+colon diverticulosis (Div) were compared with FMS-only women, for fibromyalgia pain (number/intensity of episodes, analgesic consumption) over comparable time periods and for somatic hyperalgesia (electrical/pressure pain thresholds) in painful (Tender Points, TePs) and control areas (trapezius, deltoid, quadriceps muscles and overlying subcutis and skin)...
July 3, 2017: Pain
https://www.readbyqxmd.com/read/28683024/brain-imaging-of-pain-sensitization-in-patients-with-knee-osteoarthritis
#14
Jesus Pujol, Gerard Martínez-Vilavella, Jone Llorente-Onaindia, Ben J Harrison, Marina López-Solà, Marina López-Ruiz, Laura Blanco-Hinojo, Pere Benito, Joan Deus, Jordi Monfort
A relevant aspect in osteoarthritic pain is neural sensitization. This phenomenon involves augmented responsiveness to painful stimulation and may entail a clinically worse prognosis. We used functional MRI (fMRI) to study pain sensitization in patients with knee osteoarthritis. Sixty patients were recruited and pain sensitization was clinically defined on the basis of regional spreading of pain (spreading sensitization) and increased pain response to repeated stimulation (temporal summation). fMRI testing involved assessing brain responses to both pressure and heat stimulation...
July 3, 2017: Pain
https://www.readbyqxmd.com/read/28683023/bidirectional-association-between-fibromyalgia-and-gastroesophageal-reflux-disease-two-population-based-retrospective-cohort-analysis
#15
Jia-Chi Wang, Fung-Chang Sung, Mauranda Men, Kevin A Wang, Cheng-Li Lin, Chia-Hung Kao
Fibromyalgia (FM) tends to co-exist with gastroesophageal reflux disease (GERD). This retrospective cohort study was conducted to determine the bidirectional association between FM and GERD, using a nationwide database, the National Health Insurance of Taiwan. We established two study arms, including 35117 FM patients in Arm 1 and 34630 GERD patients in Arm 2, newly diagnosed between 2000 and 2010. For each study arm, we randomly selected 4-fold subjects with neither FM nor GERD from the same database, frequency-matched by sex, age and diagnosis date, as the respective control cohorts...
July 3, 2017: Pain
https://www.readbyqxmd.com/read/28683022/contextual-influences-on-pain-communication-in-couples-with-and-without-a-partner-with-chronic-pain
#16
Michelle M Gagnon, Thomas Hadjistavropoulos, Ying C MacNab
This is an experimental study of pain communication in couples. Despite evidence that chronic pain in one partner impacts both members of the dyad, dyadic influences on pain communication have not been sufficiently examined and are typically studied based on retrospective reports. Our goal was to directly study contextual influences (i.e., presence of chronic pain, gender, relationship quality, and pain catastrophizing) on self-reported and non-verbal (i.e., facial expressions) pain responses. Couples with (n = 66) and without (n = 65) an individual with chronic pain (ICP) completed relationship and pain catastrophizing questionnaires...
July 3, 2017: Pain
https://www.readbyqxmd.com/read/28692006/brain-signature-and-functional-impact-of-centralized-pain-a-multidisciplinary-approach-to-the-study-of-chronic-pelvic-pain-mapp-network-study
#17
Jason J Kutch, Eric Ichesco, Johnson P Hampson, Jennifer S Labus, Melissa A Farmer, Katherine T Martucci, Timothy J Ness, Georg Deutsch, A Vania Apkarian, Sean C Mackey, David J Klumpp, Anthony J Schaeffer, Larissa V Rodriguez, Karl J Kreder, Dedra Buchwald, Gerald L Andriole, H Henry Lai, Chris Mullins, John W Kusek, J Richard Landis, Emeran A Mayer, J Quentin Clemens, Daniel J Clauw, Richard E Harris
Chronic pain is often measured with a severity score that overlooks its spatial distribution across the body. This widespread pain is thought to be a marker of centralization, a central nervous system process that decouples pain perception from nociceptive input. Here, we investigated whether centralization is manifested at the level of the brain using data from 1079 participants in the Multidisciplinary Approach to the Study of Chronic Pelvic Pain Research Network (MAPP) study. Participants with a clinical diagnosis of urological chronic pelvic pain syndrome (UCPPS) were compared to pain-free controls and fibromyalgia patients, the prototypical centralized pain disorder...
June 30, 2017: Pain
https://www.readbyqxmd.com/read/28719553/the-effect-of-a-lay-led-group-based-self-management-program-for-patients-with-chronic-pain-a-randomized-controlled-trial-of-the-danish-version-of-the-chronic-pain-self-management-programme
#18
Mimi Mehlsen, Lea Hegaard, Eva Ørnbøl, Jens Søndergaard Jensen, Per Fink, Lisbeth Frostholm
The Stanford Chronic Pain Self-Management Programme (CPSMP) consists of six 2½-hour weekly workshops focusing on how to manage pain in daily life. The workshops are facilitated by two workshop leaders of whom at least one must suffer from a long-term pain condition. The program is highly structured and manualized. Only few controlled trials testing the effect of CPSMP exist.Enrolled in the study were 424 adults from 19 Danish municipalities, (72% women; age: 25-93 years) with pain of any etiology and great variation in pain history (0-50 yrs)...
June 22, 2017: Pain
https://www.readbyqxmd.com/read/28644822/the-effect-of-a-lay-led-group-based-self-management-program-for-patients-with-chronic-pain-a-randomized-controlled-trial-of-the-danish-version-of-the-chronic-pain-self-management-programme
#19
Mimi Mehlsen, Lea Hegaard, Eva Ørnbøl, Jens Søndergaard Jensen, Per Fink, Lisbeth Frostholm
The Stanford Chronic Pain Self-Management Programme (CPSMP) consists of six 2½-hour weekly workshops focusing on how to manage pain in daily life. The workshops are facilitated by two workshop leaders of whom at least one must suffer from a long-term pain condition. The program is highly structured and manualized. Only few controlled trials testing the effect of CPSMP exist.Enrolled in the study were 424 adults from 19 Danish municipalities, (72% women; age: 25-93 years) with pain of any etiology and great variation in pain history (0-50 yrs)...
June 22, 2017: Pain
https://www.readbyqxmd.com/read/28644196/cebranopadol-a-novel-first-in-class-analgesic-drug-candidate-first-experience-in-patients-with-chronic-low-back-pain-in-a-randomized-clinical-trial
#20
Annette Christoph, Marie-Henriette Eerdekens, Maurits Kok, Gisela Volkers, Rainer Freynhagen
Chronic low back pain (LBP) is a common condition, usually with involvement of nociceptive and neuropathic pain components, high economic burden and impact on quality of life. Cebranopadol is a potent, first-in-class drug candidate with a novel mechanistic approach, combining nociceptin/orphanin FQ peptide and opioid peptide receptor agonism. We conducted the first Phase II, randomized, doubleblind, placebo- and active-controlled trial, evaluating the analgesic efficacy, safety, and tolerability of cebranopadol in patients with moderate to severe chronic LBP with and without neuropathic pain component...
June 21, 2017: Pain
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