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https://www.readbyqxmd.com/read/28937579/pyrethroids-inhibit-k2p-channels-and-activate-sensory-neurons-basis-of-insecticide-induced-paraesthesias
#1
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 19, 2017: Pain
https://www.readbyqxmd.com/read/28937577/trajectories-of-musculoskeletal-pain-from-adolescence-to-middle-age-the-role-of-early-depressive-symptoms-a-27-year-follow-up-of-the-northern-swedish-cohort
#2
Päivi Leino-Arjas, Kristiina Rajaleid, Gashaw Mekuria, Tapio Nummi, Pekka Virtanen, Anne Hammarström
Depression and musculoskeletal pain are associated, but long-term follow-up studies are rare. We aimed to examine the relationship of early depressive symptoms with developmental patterns of musculoskeletal pain from adolescence to middle age. Adolescents ending compulsory school (age 16) in Luleå, Northern Sweden, in 1981 (n = 1083) were studied and followed up in 1986, 1995, and 2008 (age 43) for musculoskeletal pain. Attrition was very low. Indicators for any and severe pain were based on pain in the neck-shoulders, low back, and the extremities...
September 19, 2017: Pain
https://www.readbyqxmd.com/read/28937578/trajectories-of-pain-severity-in-juvenile-idiopathic-arthritis-results-from-the-research-in-arthritis-in-canadian-children-emphasizing-outcomes-cohort
#3
N J Shiff, S Tupper, K Oen, J Guzman, H Lim, C H Lee, R Bryce, A M Huber, G Boire, P Dancey, B Feldman, R Laxer, P Miettunen, H Schmeling, K Watanabe Duffy, D M Levy, S Turvey, R Bolaria, A Bruns, D A Cabral, S Campillo, G Chedeville, D Ehrmann Feldman, E Haddad, K Houghton, N Johnson, R Jurencak, B Lang, M Larche, K Morishita, S Ramsey, J Roth, R Schneider, R Scuccimarri, L Spiegel, E Stringer, S M Tse, R Yeung, C M Duffy, L B Tucker
We studied children enrolled within 90 days of juvenile idiopathic arthritis (JIA) diagnosis in the Research in Arthritis in Canadian Children Emphasizing Outcomes (ReACCh-Out) prospective inception cohort to identify longitudinal trajectories of pain severity and features that may predict pain trajectory at diagnosis. A total of 1062 participants were followed a median of 24.3 months (IQR = 16.0, 37.1 months). Latent trajectory analysis of pain severity, measured in a 100mm visual analogue scale, identified 5 distinct trajectories: (A) mild-decreasing pain (56...
September 18, 2017: Pain
https://www.readbyqxmd.com/read/28930774/high-levels-of-cerebrospinal-fluid-chemokines-point-to-the-presence-of-neuroinflammation-in-peripheral-neuropathic-pain-a-cross-sectional-study-of-two-cohorts-of-patients-compared-to-healthy-controls
#4
Emmanuel Bäckryd, Anne-Li Lind, Måns Thulin, Anders Larsson, Björn Gerdle, Torsten Gordh
Animal models suggest that chemokines are important mediators in the pathophysiology of neuropathic pain. Indeed, these substances have been called "gliotransmitters", a term that illustrates the close interplay between glial cells and neurons in the context of neuroinflammation and pain. However, evidence in humans is scarce. The aim of the study was to determine a comprehensive cerebrospinal fluid (CSF) inflammatory profile for neuropathic pain patients. Our hypothesis was that we would thereby find indications of a postulated on-going process of central neuroinflammation...
September 18, 2017: Pain
https://www.readbyqxmd.com/read/28937576/chronic-pain-in-families-a-cross-sectional-study-of-shared-social-behavioural-and-environmental-influences
#5
Paul Campbell, Kelvin P Jordan, Blair H Smith, Kate M Dunn
Chronic pain is common and creates significant burden to the individual and society. Emerging research has shown the influence of the family environment on pain outcomes. However it is not clear what shared factors between family members associate with chronic pain. This study aimed to investigate the family level contribution to an individual's chronic pain status. This was a cross sectional study using the Generation Scotland: Scottish Family Health Study dataset. This study focused on a nested cohort of dyads (only 2 relatives per family, n = 2714)...
September 11, 2017: Pain
https://www.readbyqxmd.com/read/28891869/chronic-exposure-to-insufficient-sleep-alters-processes-of-pain-habituation-and-sensitization
#6
Norah S Simpson, Jennifer Scott-Sutherland, Shiva Gautam, Navil Sethna, Monika Haack
Chronic pain conditions are highly co-morbid with insufficient sleep. While the mechanistic relationships between the two are not understood, chronic insufficient sleep may be one pathway through which central pain-modulatory circuits deteriorate, thereby contributing to chronic pain vulnerability over time. To test this hypothesis, an in-laboratory model of three weeks of restricted sleep with limited recovery (five nights of 4-hour sleep/night followed by two nights of 8-hour sleep/night) was compared to three weeks of 8-hour sleep/night (control protocol)...
September 1, 2017: Pain
https://www.readbyqxmd.com/read/28891868/a-bivalent-ligand-that-activates-mu-opioid-receptor-and-antagonizes-mglur5-receptor-reduces-neuropathic-pain-in-mice
#7
Cristina D Peterson, Kelley F Kitto, Eyup Akgün, Mary M Lunzer, Maureen S Riedl, Lucy Vulchanova, George L Wilcox, Philip S Portoghese, Carolyn A Fairbanks
The mu opioid receptor (MOR) and metabotropic glutamate receptor 5 (mGluR5) are well-established pharmacological targets in the management of chronic pain. Both receptors are expressed in spinal cord. MMG22, a bivalent ligand containing two pharmacophores separated by 22 atoms that simultaneously activates MOR and antagonizes mGluR5 has been shown to produce potent reversal of tactile hypersensitivity in rodent models of LPS- and bone-cancer-induced chronic pain. The present study assessed whether intrathecal MMG22 also is effective in reducing pain of neuropathic origin...
September 1, 2017: Pain
https://www.readbyqxmd.com/read/28891867/tired-of-pain-toward-a-better-understanding-of-fatigue-in-chronic-pain
#8
Stefaan Van Damme, Susanne Becker, Dimitri Van der Linden
No abstract text is available yet for this article.
September 1, 2017: Pain
https://www.readbyqxmd.com/read/28891866/passive-transfer-autoimmunity-in-a-mouse-model-of-complex-regional-pain-syndrome
#9
Tian-Zhi Guo, Xiaoyou Shi, Wen-Wu Li, Tzuping Wei, J David Clark, Wade S Kingery
It has been proposed that Complex Regional Pain Syndrome (CRPS) is a post-traumatic autoimmune disease and we previously observed that B cells are required for the full expression of CRPS-like changes a mouse tibia fracture CRPS model. The current study used the mouse model to evaluate the progression of post-fracture CRPS-like changes in wildtype (WT) and muMT fracture mice lacking B cells and antibodies. The pronociceptive effects of injecting WT fracture mouse serum antibodies into muMT fracture mice were also evaluated...
September 1, 2017: Pain
https://www.readbyqxmd.com/read/28891865/opioid-prescription-levels-and-postoperative-outcomes-in-orthopedic-surgery
#10
Crispiana Cozowicz, Ashley Olson, Jashvant Poeran, Eva E Mörwald, Nicole Zubizarreta, Federico P Girardi, Alexander P Hughes, Madhu Mazumdar, Stavros G Memtsoudis
Given the basic need for opioids in the perioperative setting, we investigated associations between opioid prescription levels and postoperative outcomes using population based data of orthopedic surgery patients. We hypothesized that increased opioid amounts would be associated with higher risk for postoperative complications. Data was extracted from the national Premier Perspective database (2006-2013); N=1,035,578 lower joint arthroplasties and N= 220,953 spine fusions. Multilevel multivariable logistic regression models measured associations between opioid dose prescription and postoperative outcomes, studied by quartile of dispensed opioid dose...
September 1, 2017: Pain
https://www.readbyqxmd.com/read/28891864/photosensitization-of-trpa1-and-trpv1-by-7-dehydrocholesterol-implications-for-the-smith-lemli-opitz-syndrome
#11
Alexandru Babes, Cosmin I Ciotu, Tal Hoffmann, Tatjana I Kichko, Tudor Selescu, Cristian Neacsu, Susanne K Sauer, Peter W Reeh, Michael J M Fischer
Loss of function mutations in the enzyme 7-dehydrocholesterol reductase are responsible for the Smith-Lemli-Opitz syndrome, in which 7-dehydrocholesterol (7-DHC) levels are markedly increased in the plasma and tissues of patients. This increase in 7-DHC is probably associated with the painful and itchy photosensitivity reported by the large majority of Smith-Lemli-Opitz syndrome patients. In order to identify the molecular targets involved in the activation and photosensitization of primary afferents by 7-DHC we focused on TRPA1 and TRPV1, two ion channels expressed in nociceptive nerve endings and previously shown to respond to ultraviolet and visible light under pathophysiological circumstances...
September 1, 2017: Pain
https://www.readbyqxmd.com/read/28885457/cannabis-constituent-synergy-in-a-mouse-neuropathic-pain-model
#12
Sherelle L Casey, Nicholas Atwal, Christopher W Vaughan
Cannabis and its psychoactive constituent Δ9-tetrahydrocannabinol (THC) have efficacy against neuropathic pain however, this is hampered by their side-effects. It has been suggested that co-administration with another major constituent cannabidiol (CBD) might enhance the analgesic actions of THC and minimise its deleterious side-effects. We examined the basis for this phytocannabinoid interaction in a mouse chronic constriction injury (CCI) model of neuropathic pain. Acute systemic administration of THC dose-dependently reduced CCI-induced mechanical and cold allodynia, but also produced motor incoordination, catalepsy and sedation...
September 1, 2017: Pain
https://www.readbyqxmd.com/read/28885456/tumor-necrosis-factor-alpha-secreted-from-oral-squamous-cell-carcinoma-contributes-to-cancer-pain-and-associated-inflammation
#13
Nicole N Scheff, Yi Ye, Aditi Bhattacharya, Justin MacRae, Dustin H Hickman, Atul K Sharma, John C Dolan, Brian L Schmidt
Oral cancer patients report severe pain during function. Inflammation plays a role in the oral cancer microenvironment; however, the role of immune cells and associated secretion of inflammatory mediators in oral cancer pain has not been well defined. In this study, we utilized two oral cancer mouse models: a cell line supernatant injection model and the 4-nitroquinoline-1-oxide (4NQO) chemical carcinogenesis model. We used the two models to study changes in immune cell infiltrate and orofacial nociception associated with oral squamous cell carcinoma (oSCC)...
September 1, 2017: Pain
https://www.readbyqxmd.com/read/28885455/spousal-criticism-and-hostility-in-response-to-pain-what-is-the-alternative
#14
Annmarie Cano, Hallie Tankha
No abstract text is available yet for this article.
September 1, 2017: Pain
https://www.readbyqxmd.com/read/28885454/attenuation-of-early-phase-inflammation-by-cannabidiol-prevents-pain-and-nerve-damage-in-rat-osteoarthritis
#15
Holly T Philpott, Melissa O'Brien, Jason J McDougall
Osteoarthritis (OA) is a multifactorial joint disease, which includes joint degeneration, intermittent inflammation, and peripheral neuropathy. Cannabidiol (CBD) is a non-euphoria producing constituent of cannabis that has the potential to relieve pain. The aim of this study was to determine if CBD is anti-nociceptive in OA, and whether inhibition of inflammation by CBD could prevent the development of OA pain and joint neuropathy. OA was induced in male Wistar rats (150-175g) by intra-articular injection of sodium monoiodoacetate (MIA; 3mg)...
September 1, 2017: Pain
https://www.readbyqxmd.com/read/28885453/peripheral-afferents-and-spinal-inhibitory-system-in-dynamic-and-static-mechanical-allodynia
#16
Jun-Ho La, Jin Mo Chung
No abstract text is available yet for this article.
September 1, 2017: Pain
https://www.readbyqxmd.com/read/28885452/mirna-mediated-downregulation-of-kcc2-and-vgat-expression-in-spinal-cord-contributes-to-neonatal-cystitis-induced-visceral-pain-in-rats
#17
Jian Zhang, James Yu, Pradeep Kannampalli, Linghui Nie, Hui Meng, Bidyut Medda, Reza Shaker, Jyoti N Sengupta, Banani Banerjee
Loss of GABAergic inhibition in pain pathways has been considered to be a key component in the development of chronic pain. In the present study, we intended to examine if miR-92b-mediated post-transcriptional dysregulation of spinal potassium chloride cotransporter (KCC2) and vesicular GABA transporter (VGAT) plays a major role in the development and maintenance of long-term visceral hyperalgesia in neonatal zymosan-treated rats. Neonatal cystitis was induced by transurethral zymosan administration from postnatal (P) days 14-16 (protocol 1)...
September 1, 2017: Pain
https://www.readbyqxmd.com/read/28832398/hypoalgesic-placebo-effects-can-occur-with-transparent-disclosures
#18
Luana Colloca
No abstract text is available yet for this article.
August 21, 2017: Pain
https://www.readbyqxmd.com/read/28832397/the-discovery-of-endogenous-opioid-systems-what-it-has-meant-for-the-clinician-s-understanding-of-pain-and-its-treatment
#19
Jane C Ballantyne, Mark D Sullivan
Before the discovery of the endogenous opioid system in the 1970s, opioids were understood only through the lens of opioid drug effects. Opium produced sleep, pain relief and addiction. Once a variety of opioids had been extracted from opium, and still others synthesized chemically, it became clear that there must be endogenous receptors to explain differential drug effects. So, the search was on to identify the receptors, and subsequently, their endogenous ligands. Even then, the consequential ways in which the endogenous opioid system influences the way we respond to the environment and survive took time to unravel...
August 21, 2017: Pain
https://www.readbyqxmd.com/read/28832396/monomethyl-fumarate-mmf-inhibits-pain-behaviors-and-amygdala-activity-in-a-rat-arthritis-model
#20
Hyunyoung Kim, Jeremy Thompson, Guangchen Ji, Vadivel Ganapathy, Volker Neugebauer
Neuroplasticity in the amygdala, a brain center for emotions, leads to increased neuronal activity and output that can generate emotional-affective behaviors and modulate nocifensive responses. Mechanisms of increased activity in the amygdala output region (central nucleus, CeA) include increased reactive oxygen species, and so we explored beneficial effects of monomethyl fumarate (MMF), which can have neuroprotective effects through the nuclear factor (erythroid-derived 2)-like 2 (Nrf2) antioxidant response pathway...
August 21, 2017: Pain
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