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Conditioned pain modulation

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https://www.readbyqxmd.com/read/28344100/facilitated-pro-nociceptive-pain-mechanisms-in-radiating-back-pain-compared-with-localized-back-pain
#1
Henrik Bjarke Vaegter, Thorvaldur Skuli Palsson, Thomas Graven-Nielsen
Facilitated pain mechanisms and impaired pain inhibition are often found in chronic pain patients. This study compared clinical pain profiles, pain sensitivity, as well as pro-nociceptive and anti-nociceptive mechanisms in patients with localized low back pain (n=18), localized neck pain (n=17), low back and radiating leg pain (n=18), or neck and radiating arm pain (n=17). It was hypothesized that patients with radiating pain had facilitated pain mechanisms and impaired pain inhibition compared with localized pain patients...
March 23, 2017: Journal of Pain: Official Journal of the American Pain Society
https://www.readbyqxmd.com/read/28328574/the-long-term-reliability-of-static-and-dynamic-quantitative-sensory-testing-in-healthy-individuals
#2
Anna Marcuzzi, Paul J Wrigley, Catherine M Dean, Roger Adams, Julia M Hush
Quantitative sensory tests (QST) have been increasingly used to investigate alterations in somatosensory function in a wide range of painful conditions. The interpretation of these findings is based on the assumption that the measures are stable and reproducible. To date, reliability of QST has been investigated for short test-retest intervals. The aim of this study was to investigate the long-term reliability of a multimodal QST assessment in healthy people, with testing conducted on three occasions over 4-months...
March 21, 2017: Pain
https://www.readbyqxmd.com/read/28322973/imidazoline-i2-receptors-an-update
#3
REVIEW
Jun-Xu Li
Since first introduced more than two decades ago, the research in imidazoline I2 receptors has been steadily increasing. This review provides an update on the current status of I2 receptor pharmacology. Imidazoline I2 receptors or I2 binding sites refer to several (at least four) different proteins that bind to [(3)H]-idazoxan and [(3)H]-2-BFI with high affinity. The molecular identities of the proteins remain elusive. One of the proteins (45 kD) seems to be consistent with the identity of brain creatine kinase...
March 16, 2017: Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28317450/personality-traits-are-potentially-associated-with-the-presence-of-chronic-temporomandibular-joint-pain-in-patients-without-effusion-as-determined-by-t-2-weighted-magnetic-resonance
#4
Daniele Manfredini, Silvia Cerea, Chiara Pavan, Luca Guarda-Nardini
OBJECTIVE: The study aimed at investigating personality traits in chronic temporomandibular joints (TMJ) pain patients with and without joint effusion. METHODS: Two groups of chronic TMJ pain patients were recruited. The TMJ pain control group was composed of patients showing magnetic resonance imaging (MRI) signs of TMJ effusion, while the TMJ pain test group included patients with chronic TMJ pain seemingly not justified, due to the absence of MRI-detected disorders...
March 20, 2017: Cranio: the Journal of Craniomandibular Practice
https://www.readbyqxmd.com/read/28315267/pharmacological-modulation-of-the-sigma-1-receptor-and-the-treatment-of-pain
#5
Manuel Merlos, Javier Burgueño, Enrique Portillo-Salido, Carlos Ramón Plata-Salamán, José Miguel Vela
There is a critical need for new analgesics acting through new mechanisms of action, which could increase the efficacy with respect to existing therapies and reduce their unwanted effects. Current preclinical evidence supports the modulatory role of sigma-1 receptors (σ1R) in nociception, mainly based on the pain-attenuated phenotype of σ1R knockout mice and on the antinociceptive effect exerted by σ1R antagonists on pains of different etiologies. σ1R is highly expressed in different pain areas of the CNS and the periphery (particularly dorsal root ganglia), and interacts and modulates the functionality of different receptors and ion channels ...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28301400/the-role-of-calcitonin-gene-related-peptide-in-peripheral-and-central-pain-mechanisms-including-migraine
#6
Smriti Iyengar, Michael H Ossipov, Kirk W Johnson
Calcitonin gene-related peptide (CGRP) is a 37-amino acid peptide found primarily in the C and Aδ sensory fibers arising from the dorsal root and trigeminal ganglia, as well as the central nervous system. Calcitonin gene-related peptide was found to play important roles in cardiovascular, digestive, and sensory functions. Although the vasodilatory properties of CGRP are well documented, its somatosensory function regarding modulation of neuronal sensitization and of enhanced pain has received considerable attention recently...
April 2017: Pain
https://www.readbyqxmd.com/read/28300651/sleep-fragmentation-hypersensitizes-healthy-young-women-to-deep-and-superficial-experimental-pain
#7
Stella Iacovides, Kezia George, Peter Kamerman, Fiona C Baker
The effect of sleep deprivation on pain sensitivity has typically been studied using total and partial sleep deprivation protocols. These protocols do not mimic the fragmented pattern of sleep disruption usually observed in individuals with clinical pain conditions. Therefore, we conducted a controlled-experiment to investigate the effect of sleep fragmentation on pain perception (deep pain: forearm muscle ischaemia, and superficial pain: graded pin-pricks applied to the skin) in 11 healthy young women following two consecutive nights of sleep fragmentation, compared with a normal night of sleep...
March 11, 2017: Journal of Pain: Official Journal of the American Pain Society
https://www.readbyqxmd.com/read/28299412/tdcs-application-over-the-stg-improves-the-ability-to-recognize-and-appreciate-elements-involved-in-humor-processing
#8
Mirella Manfredi, Alice Mado Proverbio, Ana Paula Gonçalves Donate, Sofia Macarini Gonçalves Vieira, William Edgar Comfort, Mariana De Araújo Andreoli, Paulo Sérgio Boggio
The superior temporal gyrus (STG) has been found to play a crucial role in the recognition of actions and facial expressions and may, therefore, be critical for the processing of humorous information. Here we investigated whether tDCS application to the STG would modulate the ability to recognize and appreciate the comic element in serious and comedic situations of misfortune. To this aim, the effects of different types of tDCS stimulation on the STG were analyzed during a task in which the participants were instructed to categorize various misfortunate situations as "comic" or "not comic"...
March 15, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28287532/dynamic-quantitative-sensory-testing-to-characterize-central-pain-processing
#9
Ian G Mackey, Eric A Dixon, Kevin Johnson, Jiang-Ti Kong
Central facilitation and modulation of incoming nociceptive signals play an important role in the perception of pain. Disruption in central pain processing is present in many chronic pain conditions and can influence responses to specific therapies. Thus, the ability to precisely describe the state of central pain processing has profound clinical significance in both prognosis and prediction. Because it is not practical to record neuronal firings directly in the human spinal cord, surrogate behavior tests become an important tool to assess the state of central pain processing...
February 16, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28287401/prostaglandin-mediated-inhibition-of-serotonin-signaling-controls-the-affective-component-of-inflammatory-pain
#10
Anand Kumar Singh, Joanna Zajdel, Elahe Mirrasekhian, Nader Almoosawi, Isabell Frisch, Anna M Klawonn, Maarit Jaarola, Michael Fritz, David Engblom
Pain is fundamentally unpleasant and induces a negative affective state. The affective component of pain is mediated by circuits that are distinct from those mediating the sensory-discriminative component. Here, we have investigated the role of prostaglandins in the affective dimension of pain using a rodent pain assay based on conditioned place aversion to formalin injection, an inflammatory noxious stimulus. We found that place aversion induced by inflammatory pain depends on prostaglandin E2 that is synthesized by cyclooxygenase 2 in neural cells...
March 13, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28277434/age-interactions-on-pain-sensitization-in-patients-with-severe-knee-osteoarthritis-and-controls
#11
Kristian Kjær Petersen, Lars Arendt-Nielsen, Sara Finocchietti, Rogerio Pessoto Hirata, Ole Simonsen, Mogens Berg Laursen, Thomas Graven-Nielsen
OBJECTIVES: Widespread pressure hyperalgesia, facilitated temporal summation of pain (TSP), and impaired conditioned pain modulation (CPM) have been found in knee osteoarthritis (KOA) patients compared with controls and these parameters have further been suggested to be altered in the elderly. This study investigated the influence of age on pressure hyperalgesia, TSP, and CPM in patients with KOA and controls. METHODS: One-hundred-thirty-three severe KOA patients and 50 age and sex-matched asymptomatic controls were assessed by cuff algometry and handheld pressure algometry...
March 8, 2017: Clinical Journal of Pain
https://www.readbyqxmd.com/read/28275913/sigma-1-receptor-and-pain
#12
Manuel Merlos, Luz Romero, Daniel Zamanillo, Carlos Plata-Salamán, José Miguel Vela
There is a critical need for new analgesics acting through new mechanisms of action, which could increase the efficacy respect to existing therapies and/or reduce their unwanted effects. Current preclinical evidence supports the modulatory role of the sigma-1 receptor (σ1R) in nociception, mainly based on the pain-attenuated phenotype of σ1R knockout mice and on the antinociceptive effect exerted by σ1R antagonists on pain of different etiology, very consistently in neuropathic pain, but also in nociceptive, inflammatory, and visceral pain...
March 9, 2017: Handbook of Experimental Pharmacology
https://www.readbyqxmd.com/read/28269604/effects-of-high-frequency-rtms-on-sleep-deprivation-a-pilot-study
#13
D P Martinez-Cancino, J Azpiroz-Leehan, L Jimenez-Angeles, A Garcia-Quintanar, R Santana-Miranda
Transcranial magnetic stimulation is a neurostimulation technique which has the potential to serve as a unique research tool for investigating a wide variety of fields in cognitive neuroscience. TMS has been approved by the FDA to serve as a treatment to depression and has also been used to evaluate its effects among several conditions such as Alzheimer, Parkinson disease, chronic pain and stroke. High frequency TMS has been previously used with the intention to measure and modulate the negative effects of sleep deprivation in cognitive performance, but there is no consensus about the ideal protocol yet...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28265507/the-effects-of-elevated-pain-inhibition-on-endurance-exercise-performance
#14
Andrew Flood, Gordon Waddington, Richard J Keegan, Kevin G Thompson, Stuart Cathcart
BACKGROUND: The ergogenic effects of analgesic substances suggest that pain perception is an important regulator of work-rate during fatiguing exercise. Recent research has shown that endogenous inhibitory responses, which act to attenuate nociceptive input and reduce perceived pain, can be increased following transcranial direct current stimulation of the hand motor cortex. Using high-definition transcranial direct current stimulation (HD-tDCS; 2 mA, 20 min), the current study aimed to examine the effects of elevated pain inhibitory capacity on endurance exercise performance...
2017: PeerJ
https://www.readbyqxmd.com/read/28263912/modulation-of-microenvironmental-ph-for-dual-release-and-reduced-in-vivo-gastrointestinal-bleeding-of-aceclofenac-using-hydroxypropyl-methylcellulose-based-bilayered-matrix-tablet
#15
Won-Ho Kang, Hien Van Nguyen, Chulhun Park, Youn-Woong Choi, Beom-Jin Lee
This study was designed to develop a once-daily controlled-release matrix tablet of aceclofenac 200mg (AFC-CR) with dual release characteristics and to investigate the role of an alkalizer in enhancing drug solubility and reducing the occurrence of gastroduodenal mucosal lesions. Two formulation approaches were employed, namely a monolithic matrix tablet and a bilayered tablet. In vitro dissolution studies of AFC-CR tablets were carried out in simulated intestinal fluid (pH6.8 buffer). The in vivo pharmacokinetic studies and drug safety of the immediate-release reference tablet Airtal® 100mg (Daewoong Co...
March 2, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28260354/overlap-of-gerd-and-gastrointestinal-functional-disorders
#16
Nicola De Bortoli, Veronica Natali, Sara Melissari, Natalia Simonetti, Gherardo Tapete, Santino Marchi
The functional gastrointestinal disorders (FGIDs) are common conditions with an overall prevalence burden estimated at approximately one-third of the population. These represent a heterogeneous group of conditions which may include both abnormal symptom perception and functional causes and seems to share similar trigger factors as food, lifestyle and psychological factor. GERD develops when the reflux of gastric contents into the esophagus leads to troublesome symptoms, with or without mucosal involvement. Functional heartburn represents a subcategory of patients who refers with heartburn but without abnormal esophageal acid exposure, abnormal number of reflux events or any temporal correlation between symptoms and reflux events, on the same hands these patients do not report any symptom relief during antisecretory treatment with proton pump inhibitors...
March 3, 2017: Minerva Gastroenterologica e Dietologica
https://www.readbyqxmd.com/read/28251920/nonpainful-remote-electrical-stimulation-alleviates-episodic-migraine-pain
#17
David Yarnitsky, Lana Volokh, Alon Ironi, Boaz Weller, Merav Shor, Alla Shifrin, Yelena Granovsky
OBJECTIVE: To evaluate the efficacy of remote nonpainful electrical upper arm skin stimulation in reducing migraine attack pain. METHODS: This is a prospective, double-blinded, randomized, crossover, sham-controlled trial. Migraineurs applied skin electrodes to the upper arm soon after attack onset for 20 minutes, at various pulse widths, and refrained from medications for 2 hours. Patients were asked to use the device for up to 20 attacks. RESULTS: In 71 patients (299 treatments) with evaluable data, 50% pain reduction was obtained for 64% of participants based on best of 200-μs, 150-μs, and 100-μs pulse width stimuli per individual vs 26% for sham stimuli...
March 1, 2017: Neurology
https://www.readbyqxmd.com/read/28240741/genetic-ablation-of-ginip-expressing-primary-sensory-neurons-strongly-impairs-formalin-evoked-pain
#18
Louise Urien, Stéphane Gaillard, Laure Lo Re, Pascale Malapert, Manon Bohic, Ana Reynders, Aziz Moqrich
Primary sensory neurons are heterogeneous by myriad of molecular criteria. However, the functional significance of this remarkable heterogeneity is just emerging. We precedently described the GINIP(+) neurons as a new subpopulation of non peptidergic C-fibers encompassing the free nerve ending cutaneous MRGPRD(+) neurons and C-LTMRs. Using our recently generated ginip mouse model, we have been able to selectively ablate the GINIP(+) neurons and assess their functional role in the somatosensation. We found that ablation of GINIP(+) neurons affected neither the molecular contents nor the central projections of the spared neurons...
February 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28227862/effects-of-high-frequency-rtms-on-sleep-deprivation-a-pilot-study
#19
D P Martinez-Cancino, J Azpiroz-Leehan, L Jimenez-Angeles, A Garcia-Quintanar, R Santana-Miranda, D P Martinez-Cancino, J Azpiroz-Leehan, L Jimenez-Angeles, A Garcia-Quintanar, R Santana-Miranda, A Garcia-Quintanar, L Jimenez-Angeles, R Santana-Miranda, J Azpiroz-Leehan, D P Martinez-Cancino
Transcranial magnetic stimulation is a neurostimulation technique which has the potential to serve as a unique research tool for investigating a wide variety of fields in cognitive neuroscience. TMS has been approved by the FDA to serve as a treatment to depression and has also been used to evaluate its effects among several conditions such as Alzheimer, Parkinson disease, chronic pain and stroke. High frequency TMS has been previously used with the intention to measure and modulate the negative effects of sleep deprivation in cognitive performance, but there is no consensus about the ideal protocol yet...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225816/bayesian-prediction-of-placebo-analgesia-in-an-instrumental-learning-model
#20
Won-Mo Jung, Ye-Seul Lee, Christian Wallraven, Younbyoung Chae
Placebo analgesia can be primarily explained by the Pavlovian conditioning paradigm in which a passively applied cue becomes associated with less pain. In contrast, instrumental conditioning employs an active paradigm that might be more similar to clinical settings. In the present study, an instrumental conditioning paradigm involving a modified trust game in a simulated clinical situation was used to induce placebo analgesia. Additionally, Bayesian modeling was applied to predict the placebo responses of individuals based on their choices...
2017: PloS One
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