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Conditioned pain modulation

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https://www.readbyqxmd.com/read/27902566/conditioned-pain-modulation-in-non-specific-chronic-back-pain-patients-with-chronic-local-pain-chronic-widespread-pain-and-fibromyalgia
#1
Andreas Gerhardt, Wolfgang Eich, Rolf-Detlef Treede, Jonas Tesarz
Findings considering conditioned pain modulation (CPM) in chronic back pain (CBP) are contradictory. This might be because many CBP patients report pain in further areas of the body and altered CPM might influence spatial extent of pain rather than CBP per se. Therefore, we compared CPM in CBP patients with different pain extent. Fibromyalgia syndrome (FMS) patients, for whom CPM-impairment is reported most consistently, were measured for comparison.Based on clinical evaluation and pain-drawings patients were categorized into chronic local back pain (CLP; n=53), chronic widespread back pain (CWP; n=32), and FMS (n=92)...
November 28, 2016: Pain
https://www.readbyqxmd.com/read/27899280/behavioural-phenotype-of-histamine-h4-receptor-knockout-mice-focus-on-central-neuronal-functions
#2
Maria Domenica Sanna, Carla Ghelardini, Robin L Thurmond, Emanuela Masini, Nicoletta Galeotti
The functional expression of H4 receptors (H4R) within neurons of the central nervous system has been recently reported, but their role is poorly understood. The present study aims to elucidate the role of neuronal H4R by providing the first description of the behavioural phenotype of H4R-deficient (H4R knockout, H4R-KO) mice. Mice lacking H4R underwent behavioural studies to evaluate locomotor activity, pain perception, anxiety, depression, memory and feeding behaviour. H4R-KO mice showed a significant increase in ambulation in an open field as well as in exploratory activity in the absence of any modification of motor coordination...
November 26, 2016: Neuropharmacology
https://www.readbyqxmd.com/read/27898339/dietary-phytochemicals-for-possible-preventive-and-therapeutic-option-of-uterine-fibroids-signaling-pathways-as-target
#3
REVIEW
Md Soriful Islam, James H Segars, Mario Castellucci, Pasquapina Ciarmela
A growing interest has emerged on dietary phytochemicals to control diverse pathological conditions. Unfortunately, dietary phytochemical research in uterine fibroids is still under construction. Uterine fibroids/leiomyomas are benign tumors developing from the myometrium of the uterus in premenopausal women. They may occur in more than 70% of women, and approximately 25% of women show clinically significant symptoms. These include heavy and prolonged menstrual bleeding, pelvic pressure (urinary frequency, incontinence, and difficulty with urination), pelvic pain, pelvic mass, infertility, and reproductive dysfunction...
October 20, 2016: Pharmacological Reports: PR
https://www.readbyqxmd.com/read/27891703/an-investigation-into-the-inhibitory-function-of-serotonin-in-diffuse-noxious-inhibitory-controls-in-the-neuropathic-rat
#4
K Bannister, S Lockwood, L Goncalves, R Patel, A H Dickenson
BACKGROUND: Following neuropathy α2-adrenoceptor-mediated diffuse noxious inhibitory controls (DNIC), whereby a noxious conditioning stimulus inhibits the activity of spinal wide dynamic range (WDR) neurons, are abolished, and spinal 5-HT7 receptor densities are increased. Here, we manipulate spinal 5-HT content in spinal nerve ligated (SNL) animals and investigate which 5-HT receptor mediated actions predominate. METHODS: Using in vivo electrophysiology we recorded WDR neuronal responses to von frey filaments applied to the hind paw before, and concurrent to, a noxious ear pinch (the conditioning stimulus) in isoflurane-anaesthetised rats...
November 28, 2016: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/27891390/effectiveness-of-centchroman-on-regression-of-fibroadenosis-and-mastalgia
#5
Udayakumar Rajswaroob, Rajendiran Kannan, Narayanasamy Subbaraju Kannan, T Tirouaroul
INTRODUCTION: Fibroadenosis and mastalgia are common among the women in reproductive age group. Treatment for these conditions is not yet standardised. Most of the drugs used for fibroadenosis and mastalgia are expensive and have side effects. AIM: To find out the efficacy of centchroman, a Selective Estrogens Receptor Modulator (SERM) on regression of fibroadenosis and mastalgia. MATERIALS AND METHODS: Fifty one patients with mastalgia/fibroadenosis were treated with centchroman 30mg once daily on alternate days for a period of 3 months and followed up weekly for six months with Mastalgia chart and Visual Analog Scale (VAS) pain score...
October 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/27884690/conditioned-pain-modulation-and-pressure-pain-sensitivity-in-the-adult-danish-general-population-the-danfund-study
#6
S Skovbjerg, T Jørgensen, L Arendt-Nielsen, J F Ebstrup, T Carstensen, T Graven-Nielsen
: Increased pressure pain sensitivity and impaired descending pain control have been associated with chronic pain, but knowledge on the variability in the adult general population is lacking. Pressure pain thresholds (PPTs) and descending pain control as assessed by conditioning pain modulation (CPM) were recorded in a randomly selected sample (n=2199, 53% females) of the Danish adult general population aged 18-70 years. PPTs were recorded over the tibialis anterior muscle and the upper trapezius muscle...
November 21, 2016: Journal of Pain: Official Journal of the American Pain Society
https://www.readbyqxmd.com/read/27872581/a-trigger-for-opioid-misuse-chronic-pain-and-stress-dysregulate-the-mesolimbic-pathway-and-kappa-opioid-system
#7
REVIEW
Nicolas Massaly, Jose A Morón, Ream Al-Hasani
Pain and stress are protective mechanisms essential in avoiding harmful or threatening stimuli and ensuring survival. Despite these beneficial roles, chronic exposure to either pain or stress can lead to maladaptive hormonal and neuronal modulations that can result in chronic pain and a wide spectrum of stress-related disorders including anxiety and depression. By inducing allostatic changes in the mesolimbic dopaminergic pathway, both chronic pain and stress disorders affect the rewarding values of both natural reinforcers, such as food or social interaction, and drugs of abuse...
2016: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/27871921/eeg-frequency-tagging-using-ultra-slow-periodic-heat-stimulation-of-the-skin-reveals-cortical-activity-specifically-related-to-c-fiber-thermonociceptors
#8
Elisabeth Colon, Giulia Liberati, André Mouraux
The recording of event-related brain potentials triggered by a transient heat stimulus is used extensively to study nociception and diagnose lesions or dysfunctions of the nociceptive system in humans. However, these responses are related exclusively to the activation of a specific subclass of nociceptive afferents: quickly-adapting thermonociceptors. In fact, except if the activation of Aδ fibers is avoided or if A fibers are blocked, these responses specifically reflect activity triggered by the activation of Type 2 quickly-adapting A fiber mechano-heat nociceptors (AMH-2)...
November 18, 2016: NeuroImage
https://www.readbyqxmd.com/read/27867111/anti-inflammatory-activity-of-punica-granatum-l-pomegranate-rind-extracts-applied-topically-to-ex-vivo-skin
#9
David M J Houston, Joachim Bugert, Stephen P Denyer, Charles M Heard
Coadministered pomegranate rind extract (PRE) and zinc (II) produces a potent virucidal activity against Herpes simplex virus (HSV); however, HSV infections are also associated with localised inflammation and pain. Here, the objective was to determine the anti-inflammatory activity and relative depth penetration of PRE, total pomegranate tannins (TPT) and zinc (II) in skin, ex vivo. PRE, TPT and ZnSO4 were dosed onto freshly excised ex vivo porcine skin mounted in Franz diffusion cells and analysed for COX-2, as a marker for modulation of the arachidonic acid inflammation pathway, by Western blotting and immunohistochemistry...
November 17, 2016: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/27862179/the-use-of-a-battery-of-pain-models-to-detect-analgesic-properties-of-compounds-a-two-part-four-way-crossover-study
#10
P Okkerse, G van Amerongen, M L de Kam, J Stevens, R P Butt, R Gurrell, A Dahan, J M van Gerven, J L Hay, G J Groeneveld
AIM: The aim was to investigate the ability of a battery of pain models to detect analgesic properties of commonly used analgesics in healthy subjects. METHODS: The battery consisted of tests eliciting electrical, mechanical and thermal (contact heat and cold pressor)-pain and included a UVB model, the thermal grill illusion and a paradigm of conditioned pain modulation. Subjects were administered fentanyl 3 µg/kg, phenytoin 300 mg, (S)-ketamine 10 mg and placebo (part I), or imipramine 100 mg, pregabalin 300 mg, ibuprofen 600 mg and placebo (part II)...
November 9, 2016: British Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/27859944/user-independent-assessment-of-conditioning-pain-modulation-by-cuff-pressure-algometry
#11
T Graven-Nielsen, M Izumi, K K Petersen, L Arendt-Nielsen
BACKGROUND: The use of conditioning pain modulation (CPM) is hampered by poor reproducibility and lack of user-independent paradigms. This study refined the CPM paradigm by applying user-independent cuff algometry. METHODS: In 20 subjects, the CPM effect of conditioning with cuff stimulation on the arm was investigated by pain test stimuli on the contralateral leg before and in parallel with different cuff conditionings (10, 30, 60 kPa/60 s; 30, 60 kPa/10 s)...
November 11, 2016: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/27856138/predicting-three-month-functional-outcomes-after-an-ed-visit-for-acute-low-back-pain
#12
Benjamin W Friedman, Stuart Gensler, Andrew Yoon, Rebecca Nerenberg, Lynne Holden, Polly E Bijur, E John Gallagher
BACKGROUND: Nearly 30% of patients who present to an ED with acute, new onset, low back pain (LBP) report LBP-related functional impairment three months later. These patients are at risk of chronic LBP, a highly debilitating condition. It has been reported previously that functional impairment, depression, and psychosomatic symptomatology at the index visit are associated with poor LBP outcomes. We wished to replicate those findings in a cohort of ED patients, and also to determine if clinical features present at one week follow-up could predict three-month outcomes in individual patients...
November 5, 2016: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/27854251/nociceptive-trp-channels-sensory-detectors-and-transducers-in-multiple-pain-pathologies
#13
REVIEW
Aaron D Mickle, Andrew J Shepherd, Durga P Mohapatra
Specialized receptors belonging to the transient receptor potential (TRP) family of ligand-gated ion channels constitute the critical detectors and transducers of pain-causing stimuli. Nociceptive TRP channels are predominantly expressed by distinct subsets of sensory neurons of the peripheral nervous system. Several of these TRP channels are also expressed in neurons of the central nervous system, and in non-neuronal cells that communicate with sensory nerves. Nociceptive TRPs are activated by specific physico-chemical stimuli to provide the excitatory trigger in neurons...
November 14, 2016: Pharmaceuticals
https://www.readbyqxmd.com/read/27852962/anatomy-and-immunochemical-characterization-of-the-non-arterial-peptidergic-diffuse-dural-innervation-of-the-rat-and-rhesus-monkey-implications-for-functional-regulation-and-treatment-in-migraine
#14
Frank L Rice, Jennifer Y Xie, Phillip J Albrecht, Emily Acker, Justin Bourgeois, Edita Navratilova, David W Dodick, Frank Porreca
OBJECTIVE: The interplay between neuronal innervation and other cell types underlies the physiological functions of the dura mater and contributes to pathophysiological conditions such as migraine. We characterized the extensive, but understudied, non-arterial diffuse dural innervation (DDI) of the rat and Rhesus monkey. METHODS: We used a comprehensive integrated multi-molecular immunofluorescence labeling strategy to extensively profile the rat DDI and to a lesser extent that of the Rhesus monkey...
November 16, 2016: Cephalalgia: An International Journal of Headache
https://www.readbyqxmd.com/read/27833762/rostral-agranular-insular-cortex-lesion-with-motor-cortex-stimulation-enhances-pain-modulation-effect-on-neuropathic-pain-model
#15
Hyun Ho Jung, Jaewoo Shin, Jinhyung Kim, Seung-Hee Ahn, Sung Eun Lee, Chin Su Koh, Jae Sung Cho, Chanho Kong, Hyung-Cheul Shin, Sung June Kim, Jin Woo Chang
It is well known that the insular cortex is involved in the processing of painful input. The aim of this study was to evaluate the pain modulation role of the insular cortex during motor cortex stimulation (MCS). After inducing neuropathic pain (NP) rat models by the spared nerve injury method, we made a lesion on the rostral agranular insular cortex (RAIC) unilaterally and compared behaviorally determined pain threshold and latency in 2 groups: Group A (NP + MCS; n = 7) and Group B (NP + RAIC lesion + MCS; n = 7)...
2016: Neural Plasticity
https://www.readbyqxmd.com/read/27825384/inhibiting-the-proton-pump-mechanisms-benefits-harms-and-questions
#16
Jeffrey K Aronson
Inhibition of the H(+)/K(+)-adenosine triphosphatase (the proton pump) is the final common mechanistic pathway in reducing gastric acid secretion pharmacologically. Proton pump inhibitors are widely used in upper gastrointestinal diseases, including gastric and duodenal ulcers, eradication of Helicobacter pylori in combination with antibiotics, gastroesophageal reflux disease, Zollinger-Ellison syndrome, eosinophilic esophagitis, and prevention of non-steroidal anti-inflammatory drug-induced peptic ulceration...
November 9, 2016: BMC Medicine
https://www.readbyqxmd.com/read/27818642/decreased-pain-perception-by-unconscious-emotional-pictures
#17
Irene Peláez, David Martínez-Iñigo, Paloma Barjola, Susana Cardoso, Francisco Mercado
Pain perception arises from a complex interaction between a nociceptive stimulus and different emotional and cognitive factors, which appear to be mediated by both automatic and controlled systems. Previous evidence has shown that whereas conscious processing of unpleasant stimuli enhances pain perception, emotional influences on pain under unaware conditions are much less known. The aim of the present study was to investigate the modulation of pain perception by unconscious emotional pictures through an emotional masking paradigm...
2016: Frontiers in Psychology
https://www.readbyqxmd.com/read/27808438/warm-hands-cold-heart-progressive-whole-body-cooling-increases-warm-thermosensitivity-of-human-hands-and-feet-in-a-dose-dependent-fashion
#18
Davide Filingeri, Nathan B Morris, Ollie Jay
While inhibitory/facilitatory central modulation of vision and pain has been investigated, contextual modulation of skin temperature integration has been unexplored. Hence, we tested whether progressive decreases in whole-body mean skin temperature (Tsk ) (a large conditioning stimulus) alter the magnitude estimation of local warming and cooling stimuli applied to hairy and glabrous skin. On 4 separate occasions, 8 males (27 ± 5y) underwent a 30-min whole-body cooling protocol (water-perfused-suit; temperature: 5 C), during which a quantitative thermosensory test, consisting of reporting perceived magnitude of warming and cooling stimuli (±8°C from 30°C baseline) applied to the hand (palm/dorsum) and foot (sole/dorsum), was performed before cooling and every 10 min thereafter...
November 3, 2016: Experimental Physiology
https://www.readbyqxmd.com/read/27807916/alpha-range-visual-and-auditory-stimulation-reduces-the-perception-of-pain
#19
K Ecsy, A K P Jones, C A Brown
BACKGROUND: Alpha power is believed to have an inverse relationship with the perception of pain. Increasing alpha power through an external stimulus may, therefore, induce an analgesic effect. Here, we attempt to modulate the perception of a moderately painful acute laser stimulus by separately entraining three frequencies across the alpha band: 8, 10 and 12 Hz. METHODS: Participants were exposed to either visual or auditory stimulation at three frequencies in the alpha-band range and a control frequency...
November 2, 2016: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/27806306/in%C3%A2-vivo-interrogation-of-spinal-mechanosensory-circuits
#20
Amelia J Christensen, Shrivats M Iyer, Amaury François, Saurabh Vyas, Charu Ramakrishnan, Sam Vesuna, Karl Deisseroth, Grégory Scherrer, Scott L Delp
Spinal dorsal horn circuits receive, process, and transmit somatosensory information. To understand how specific components of these circuits contribute to behavior, it is critical to be able to directly modulate their activity in unanesthetized in vivo conditions. Here, we develop experimental tools that enable optogenetic control of spinal circuitry in freely moving mice using commonly available materials. We use these tools to examine mechanosensory processing in the spinal cord and observe that optogenetic activation of somatostatin-positive interneurons facilitates both mechanosensory and itch-related behavior, while reversible chemogenetic inhibition of these neurons suppresses mechanosensation...
November 1, 2016: Cell Reports
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