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Conditioned pain modulation

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https://www.readbyqxmd.com/read/29054121/multisensory-modulation-of-experimentally-evoked-perceptual-distortion-of-the-face
#1
Lilja K Dagsdóttir, Valeria Bellan, Ina Skyt, Lene Vase, Lene Baad-Hansen, Eduardo Castrillon, Peter Svensson
Chronic orofacial pain patients often perceive the painful face area as 'swollen' without clinical signs, i.e., a perceptual distortion (PD). Local anesthetic (LA) injections in healthy participants are also associated with PD OBJECTIVE: The aim was to explore whether PD evoked by LA into the infraorbital region of could be modulated by adding mechanical stimulation (MS) to the affected area METHODS: MS was given with a brush and a 128 mN von Frey filament. First, sixty healthy participants were randomly divided into three groups: 1) LA control, 2) LA with MS, 3) Isotonic solution (ISO) with MS as an additional control condition...
October 20, 2017: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/29042065/analgesic-and-anxiolytic-effects-of-leu-31-pro-34-neuropeptide-y-microinjected-into-the-periaqueductal-gray-in-rats
#2
Priscila Vázquez-León, Luis G Mendoza-Ruiz, Eduardo Ramírez-San Juan, German Alberto Chamorro-Cevallos, Abraham Miranda-Páez
Several reports have demonstrated that neuropeptide Y (NPY) is involved in food intake, epilepsy, circadian rhythms, drug seeking, pain and anxiety, and other physiological or pathological conditions. On the other hand, periaqueductal gray (PAG) is a key brain center for modulating pain, anxiety and fear. It is the main structure implicated in integrated defensive behaviors. One such behavior, tonic immobility (TI), resembles fear and is able to induce analgesia. After microinjection of [Leu(31),Pro(34)]-Neuropeptide Y ([Leu(31),Pro(34)]-NPY) into the PAG dorsal (D) or ventrolateral (VL) of adult male Wistar rats, the following parameters were assessed: i) the analgesic effect by means of the tail-flick test (TF), ii) the duration of TI as a passive defensive behavioral response and as an anxiety/fear model (considering both TF and TI as single behaviors), iii) TI-induced analgesia by the combination of TF/TI, and iv) the anxious-like state through the elevated plus maze (EPM), and defensive burying behavior (DBB)...
October 12, 2017: Neuropeptides
https://www.readbyqxmd.com/read/29036889/single-administration-of-melatonin-modulates-the-nitroxidergic-system-at-the-peripheral-level-and-reduces-thermal-nociceptive-hypersensitivity-in-neuropathic-rats
#3
Elisa Borsani, Barbara Buffoli, Veronica Bonazza, Russel J Reiter, Rita Rezzani, Luigi F Rodella
Neuropathic pain is a severe condition with unsatisfactory treatments. Melatonin, an indolamine, seems to be a promising molecule suitable for this purpose due to its well-known anti-inflammatory, analgesic, and antioxidant effects, as well as its modulation of the nitroxidergic system. Nevertheless, the data on its mechanism of action and potentialities are currently insufficient in this pathology, especially at the peripheral level. Thus, this work evaluated the effect of a single administration of melatonin in an established mononeuropathy pain model that monitors the behaviour and the changes in the nitroxidergic system in dorsal root ganglia and skin, which are affected by nervous impairment...
October 14, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29027903/functional-dichotomy-in-spinal-vs-prefrontal-projecting-locus-coeruleus-modules-splits-descending-noradrenergic-analgesia-from-ascending-aversion-and-anxiety-in-rats
#4
Stefan Hirschberg, Yong Li, Andrew Randall, Eric J Kremer, Anthony E Pickering
The locus coeruleus (LC) projects throughout the brain and spinal cord and is the major source of central noradrenaline. It remains unclear whether the LC acts functionally as a single global effector or as discrete modules. Specifically, while spinal-projections from LC neurons can exert analgesic actions, it is not known whether they can act independently of ascending LC projections. Using viral vectors taken up at axon terminals, we expressed chemogenetic actuators selectively in LC neurons with spinal (LC:(SC)) or prefrontal cortex (LC:(PFC)) projections...
October 13, 2017: ELife
https://www.readbyqxmd.com/read/29025685/generalization-of-learned-pain-modulation-depends-on-explicit-learning
#5
Leonie Koban, Daniel Kusko, Tor D Wager
The experience of pain is strongly influenced by contextual and socio-affective factors, including learning from previous experiences. Pain is typically perceived as more intense when preceded by a conditioned cue (CSHIGH) that has previously been associated with higher pain intensities, compared to cues associated with lower intensities (CSLOW). In three studies (total N=134), we tested whether this learned pain modulation generalizes to perceptually similar cues (Studies 1 and 2) and conceptually similar cues (Study 3)...
October 9, 2017: Acta Psychologica
https://www.readbyqxmd.com/read/28993727/pain-processing-in-a-social-context-and-the-link-with-psychopathic-personality-traits-an-event-related-potential-study
#6
Casper H van Heck, Josi M A Driessen, Maria Amato, Marnou N van den Berg, Pritha Bhandari, Laura Bilbao-Broch, Jordi Farres-Casals, Manon Hendriks, Adrian C Jodzio, Laura Luque-Ballesteros, Christina Schöchl, Laura R Velasco-Angeles, Roel H A Weijer, Clementina M van Rijn, Marijtje L A Jongsma
Empathy describes the ability to understand another person's feelings. Psychopathy is a disorder that is characterized by a lack of empathy. Therefore, empathy and psychopathy are interesting traits to investigate with respect to experiencing and observing pain. The present study aimed to investigate pain empathy and pain sensitivity by measuring event-related potentials (ERPs) extracted from the ongoing EEG in an interactive setup. Each participant fulfilled subsequently the role of "villain" and "victim"...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28993681/equiaxial-strain-modulates-adipose-derived-stem-cell-differentiation-within-3d-biphasic-scaffolds-towards-annulus-fibrosus
#7
Mostafa Elsaadany, Kayla Winters, Sarah Adams, Alexander Stasuk, Halim Ayan, Eda Yildirim-Ayan
Recurrence of intervertebral disc (IVD) herniation is the most important factor leading to chronic low back pain and subsequent disability after discectomy. Efficacious annulus fibrosus (AF) repair strategy that delivers cells and biologics to IVD injury site is needed to limit the progression of disc degeneration and promote disc self-regeneration capacities after discectomy procedures. In this study, a biphasic mechanically-conditioned scaffold encapsulated with human adipose-derived stem cells (ASCs) is studied as a potential treatment strategy for AF defects...
October 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28990805/experimental-evidence-for-weaker-endogenous-inhibition-of-trigeminal-pain-than-extra-trigeminal-pain-in-healthy-individuals
#8
Dan Levy, Lorin Abdian, Michal Dekel-Steinkeller, Ruth Defrin
Background and objectives The prevalence of pain syndromes that affect the territories innervated by the trigeminal nerve, such as headaches, is one of the highest and ranks second only to low back pain. A potential mechanism underlying this high prevalence may be a relatively weak endogenous pain modulation of trigeminal pain. Here, we sought to systematically compare endogenous pain modulation capabilities in the trigeminal region to those of extra-trigeminal regions in healthy subjects. Methods Healthy, pain free subjects (n = 17) underwent a battery of quantitative sensory testing to assess endogenous pain inhibition and pain enhancement efficiencies within and outside the trigeminal innervated region...
January 1, 2017: Cephalalgia: An International Journal of Headache
https://www.readbyqxmd.com/read/28980347/sensory-processing-and-central-pain-modulation-in-patients-with-chronic-shoulder-pain-a-case-control-study
#9
K Kuppens, G Hans, N Roussel, F Struyf, E Fransen, P Cras, C P Van Wilgen, J Nijs
Chronicity and recurrence in musculoskeletal shoulder pain are highly prevalent and can possibly be attributed to the concept of central sensitization. Available studies suggest a role for central sensitization in explaining chronic shoulder pain, but so far a comprehensive quantitative sensory testing (QST) protocol has not been used. The aim of this study was to gain knowledge on sensory processing and central pain modulatory mechanisms in patients suffering from chronic shoulder pain using such a QST protocol...
October 4, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28979158/the-central-sensitization-inventory-validated-and-adapted-for-a-brazilian-population-psychometric-properties-and-its-relationship-with-brain-derived-neurotrophic-factor
#10
Wolnei Caumo, Luciana C Antunes, Jéssica Lorenzzi Elkfury, Evelyn G Herbstrith, Raquel Busanello Sipmann, Andressa Souza, Iraci Ls Torres, Vinicius Souza Dos Santos, Randy Neblett
OBJECTIVES: The primary aim was to assess the psychometric properties (including internal consistency, construct validity, reproducibility, and factor structure) of the Central Sensitization Inventory (CSI), adapted and validated for a Brazilian population (CSI-BP). Additionally, we evaluated the relationship between the CSI-BP and the serum brain-derived neurotrophic factor (BDNF) and determined if the symptoms elicited by the CSI-BP discriminate between subjects who do/do not respond to the conditioned pain modulation (CPM) task, as assessed by change in numeric pain scale (0-10) score...
2017: Journal of Pain Research
https://www.readbyqxmd.com/read/28974374/the-role-of-sex-in-sleep-deprivation-related-changes-of-nociception-and-conditioned-pain-modulation
#11
Nicole Eichhorn, Rolf-Detlef Treede, Sigrid Schuh-Hofer
Sex matters both in the clinical field of pain and sleep medicine. Sleep disturbances are highly prevalent in chronic pain patients and have been shown to deteriorate the pain condition. The pathomechanisms by which insomnia aggravates pain are currently unknown. Descending pain control may be compromised by disturbed sleep, but respective studies are few, inconsistent and largely imbalanced with respect to sex. We studied the role of sex on the effect of sleep deprivation on endogenous pain modulation and on nociceptive thresholds in a highly homogenous study population of 18 female (23...
October 1, 2017: Neuroscience
https://www.readbyqxmd.com/read/28973048/subjective-sleep-quality-in-temporomandibular-disorder-patients-and-association-with-disease-characteristics-and-oral-health-related-quality-of-life
#12
Rafael Benoliel, Avraham Zini, Avraham Zakuto, Hulio Slutzky, Yaron Haviv, Yair Sharav, Galit Almoznino
AIMS: To measure sleep quality in temporomandibular disorder (TMD) patients, to compare it with that of control subjects, and to analyze its association with disease characteristics and oral health-related quality of life (OHRQoL). METHODS: The collected data included demographics, tobacco use, the Pittsburgh Sleep Quality Index (PSQI), trauma history, presence of coexisting headaches and/or body pain, parafunctional habits, pain scores, muscle tenderness to palpation scores, and the Oral Health Impact Profile-14 (OHIP-14)...
October 3, 2017: Journal of Oral & Facial Pain and Headache
https://www.readbyqxmd.com/read/28970787/salience-of-somatosensory-stimulus-modulating-external-to-internal-orienting-attention
#13
Jiaxin Peng, Sam C C Chan, Bolton K H Chau, Qiuhua Yu, Chetwyn C H Chan
Shifting between one's external and internal environments involves orienting attention. Studies on differentiating subprocesses associated with external-to-internal orienting attention are limited. This study aimed to reveal the characteristics of the disengagement, shifting and reengagement subprocesses by using somatosensory external stimuli and internally generated images. Study participants were to perceive nociceptive external stimuli (External Low (EL) or External High (EH)) induced by electrical stimulations (50 ms) followed by mentally rehearsing learned subnociceptive images (Internal Low (IL) and Internal High (IH))...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28970572/schwann-cells-promote-post-traumatic-nerve-inflammation-and-neuropathic-pain-through-mhc-class-ii
#14
Maike Hartlehnert, Angelika Derksen, Tim Hagenacker, David Kindermann, Maria Schäfers, Mathias Pawlak, Bernd C Kieseier, Gerd Meyer Zu Horste
The activation of T helper cells requires antigens to be exposed on the surface of antigen presenting cells (APCs) via MHC class II (MHC-II) molecules. Expression of MHC-II is generally limited to professional APCs, but other cell types can express MHC-II under inflammatory conditions. However, the importance of these conditional APCs is unknown. We and others have previously shown that Schwann cells are potentially conditional APCs, but the functional relevance of MHC-II expression by Schwann cells has not been studied in vivo...
October 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28970521/pain-outside-the-body-defensive-peripersonal-space-deformation-in-trigeminal-neuralgia
#15
R J Bufacchi, C F Sambo, G Di Stefano, G Cruccu, G D Iannetti
Perception of space has been guiding effective therapeutic interventions in a number of unilateral chronic pain conditions. However little is known about how trigeminal neuralgia (TN), a condition in which trigeminal stimulation triggers paroxysmal facial pain, affects defensive peripersonal space (DPPS), the portion of space surrounding the body within which defensive responses are enhanced. Given that TN is unilateral, in TN patients the DPPS of the face might not be horizontally symmetric as in pain-free individuals, but instead larger around the affected side...
October 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28954391/neuron-glia-crosstalk-and-neuropathic-pain-involvement-in-the-modulation-of-motor-activity-in-the-orofacial-region
#16
REVIEW
Mohammad Zakir Hossain, Shumpei Unno, Hiroshi Ando, Yuji Masuda, Junichi Kitagawa
Neuropathic orofacial pain (NOP) is a debilitating condition. Although the pathophysiology remains unclear, accumulating evidence suggests the involvement of multiple mechanisms in the development of neuropathic pain. Recently, glial cells have been shown to play a key pathogenetic role. Nerve injury leads to an immune response near the site of injury. Satellite glial cells are activated in the peripheral ganglia. Various neural and immune mediators, released at the central terminals of primary afferents, lead to the sensitization of postsynaptic neurons and the activation of glia...
September 26, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28953191/nucleus-accumbens-mediates-the-pronociceptive-effect-of-sleep-deprivation-the-role-of-adenosine-a2a-and-dopamine-d2-receptors
#17
Natalia Fantin Sardi, Glaucia Tobaldini, Rosana Nogueira Morais, Luana Fischer
Sleep disorders increase pain sensitivity and the risk of developing painful conditions; however, the underlying mechanisms are poorly understood. It has been suggested that nucleus accumbens (NAc) influences sleep-wake cycle by means of a balance between adenosine activity at A2A receptors and dopamine activity at D2 receptors. Because the NAc also plays an important role in pain modulation, we hypothesized that the NAc and its A2A and D2 receptors mediate the pronociceptive effect of rapid eye movement (REM) sleep deprivation (SD)...
September 25, 2017: Pain
https://www.readbyqxmd.com/read/28937587/%C3%A2%C2%B5-conotoxins-modulating-sodium-currents-in-pain-perception-and-transmission-a-therapeutic-potential
#18
REVIEW
Elisabetta Tosti, Raffaele Boni, Alessandra Gallo
The Conus genus includes around 500 species of marine mollusks with a peculiar production of venomous peptides known as conotoxins (CTX). Each species is able to produce up to 200 different biological active peptides. Common structure of CTX is the low number of amino acids stabilized by disulfide bridges and post-translational modifications that give rise to different isoforms. µ and µO-CTX are two isoforms that specifically target voltage-gated sodium channels. These, by inducing the entrance of sodium ions in the cell, modulate the neuronal excitability by depolarizing plasma membrane and propagating the action potential...
September 22, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28937579/pyrethroids-inhibit-k2p-channels-and-activate-sensory-neurons-basis-of-insecticide-induced-paraesthesias
#19
Aida Castellanos, Alba Andres, Laura Bernal, Gerard Callejo, Nuria Comes, Arcadi Gual, Jonathan P Giblin, Carolina Roza, Xavier Gasull
Pyrethroid insecticides are widely used for pest control, in agriculture or in human public health commonly as a topical treatment for scabies and head lice. Exposure to pyrethroids such as permethrin or tetramethrin (TM) causes sensory alterations such as transient pain, burning, stinging sensations and paraesthesias. Despite the well-known effects of pyrethroids on sodium channels, actions on other channels that control sensory neuron excitability are less studied. Given the role of two-pore domain potassium (K2P) channels in modulating sensory neuron excitability and firing, both in physiological and pathological conditions, we examined the effect of pyrethroids on K2P channels mainly expressed in sensory neurons...
September 25, 2017: Pain
https://www.readbyqxmd.com/read/28936909/predictors-of-chronic-pain-following-total-knee-replacement-in-females-and-males-an-exploratory-study
#20
Tanja Bossmann, Torsten Brauner, Scott Wearing, Thomas Horstmann
AIM: This study explored whether nociceptive (NS) and autonomic nervous system (ANS) dysregulation and psychological distress were predictive of pain 6 months after primary total knee replacement. PATIENTS & METHODS: ANS and NS regulation, psychological distress and self-reported pain, stiffness and function were evaluated preoperatively in 56 patients. Pain severity measured 6 months after surgery was used as the primary outcome in an analysis of covariance model...
September 22, 2017: Pain Management
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