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Pain

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https://www.readbyqxmd.com/read/27918314/a-mouse-model-for-chronic-pain-induced-increase-in-ethanol-consumption
#1
Ryan K Butler, Darin J Knapp, Veronica Ulici, Lara Longobardi, Richard F Loeser, George R Breese
Chronic pain conditions are often co-morbid with alcohol abuse. "Self-medication" with alcohol introduces a host of problems associated with the abuse of alcohol which over time has the potential of exacerbating the painful condition. Despite the prevalence of chronic pain being associated with alcohol abuse, rodent models which mimic the co-morbid conditions are lacking. In the present study, we model osteoarthritis (OA) in C57BL/6J mice by surgically destabilizing the medial meniscus (DMM). Sham operated mice served as controls...
November 30, 2016: Pain
https://www.readbyqxmd.com/read/27918315/the-gut-microbiota-as-a-key-regulator-of-visceral-pain
#2
Siobhain M O' Mahony, Timothy G Dinan, John F Cryan
Visceral pain is a significant and prevalent feature of several disorders including the functional gastrointestinal disorder, irritable bowel syndrome (IBS). Treatment strategies are limited and often unsatisfactory which has opened up new research avenues into the aetiology of visceral pain. This research has led to an increased appreciation of the role of the brain gut axis in modulating viscera pain responses. More recently, the interactions between the gut microbiota and the central nervous system have emerged indicating that visceral pain related disorders may be prospective candidates for symptom relief via microbial manipulation...
November 29, 2016: Pain
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
#3
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/27902570/preprotachykinin-a-ppta-is-expressed-by-a-distinct-population-of-excitatory-neurons-in-the-mouse-superficial-spinal-dorsal-horn-including-cells-that-respond-to-noxious-and-pruritic-stimuli
#4
Maria Gutierrez-Mecinas, Andrew M Bell, Alina Marin, Rebecca Taylor, Kieran A Boyle, Takahiro Furuta, Masahiko Watanabe, Erika Polgár, Andrew J Todd
The superficial dorsal horn, which is the main target for nociceptive and pruritoceptive primary afferents, contains a high density of excitatory interneurons. Our understanding of their roles in somatosensory processing has been restricted by the difficulty of distinguishing functional populations among these cells. We recently defined three non-overlapping populations among the excitatory neurons, based on the expression of neurotensin, neurokinin B (NKB) and gastrin-releasing peptide (GRP). Here we identify and characterise another population: neurons that express the tachykinin peptide substance P...
November 25, 2016: Pain
https://www.readbyqxmd.com/read/27902569/individual-differences-in-pain-understanding-the-mosaic-that-makes-pain-personal
#5
Roger B Fillingim
The experience of pain is characterized by tremendous inter-individual variability. Multiple biological and psychosocial variables contribute to these individual differences in pain, including demographic variables, genetic factors, and psychosocial processes. For example, sex, age and ethnic group differences in the prevalence of chronic pain conditions have been widely reported. Moreover, these demographic factors have been associated with responses to experimentally-induced pain. Similarly, both genetic and psychosocial factors contribute to clinical and experimental pain responses...
November 24, 2016: Pain
https://www.readbyqxmd.com/read/27902568/health-utilities-in-people-with-chronic-pain-using-a-population-level-survey-and-linked-healthcare-administrative-data
#6
Mary-Ellen Hogan BScPhm, Anna Taddio BScPhm, Joel Katz, Vibhuti Shah, Murray Krahn
Health utilities are a preference-based measure of health-related quality of life that facilitates comparison of disease burden across conditions. We estimated utilities using a population-based, matched sample of adolescents and adults with and without chronic pain, controlling for comorbidity.Ontarians aged ≥12 years with and without chronic pain were identified from the Canadian Community Health Survey (CCHS) 2000-01 and 2009-10 and linked to their provincial healthcare administrative data. Individuals with chronic pain were matched to those without using age, sex, survey year, and a propensity score for having chronic pain estimated from a rurality index, income quintile and comorbidity...
November 24, 2016: Pain
https://www.readbyqxmd.com/read/27902567/dorsal-root-ganglion-neurons-become-hyperexcitable-and-increase-expression-of-voltage-gated-t-type-calcium-channels-cav3-2-in-paclitaxel-induced-peripheral-neuropathy
#7
Yan Li, Claudio Esteves Tatsui, Laurence D Rhines, Robert Y North, Daniel S Harrison, Ryan M Cassidy, Caj A Johansson, Alyssa K Kosturakis, Denaya D Edwards, Hongmei Zhang, Patrick M Dougherty
Here it is shown that paclitaxel induced neuropathy is associated with the development of spontaneous activity (SA) and hyperexcitability in DRG neurons that is paralleled by increased expression of low-voltage-activated calcium channels (T-type; Cav3.2). The percentage of DRG neurons showing SA and the overall mean rate of SA were significantly higher at day 7 of paclitaxel treatment than in rats receiving vehicle. Cav3.2 expression was increased in L4-6 DRG and spinal cord segments in paclitaxel-treated rats, localized to small calcitonin gene-related peptide expressing and isolectin B4 expressing DRG neurons and to glial fibrillary acidic protein-positive spinal cord cells...
November 24, 2016: Pain
https://www.readbyqxmd.com/read/27875480/innovative-treatments-for-back-pain
#8
G Lorimer Moseley
Innovation involves asking new questions, or taking new approaches to old questions. For a problem as old as back pain, one might expect innovations to be rare. That back pain has been the most burdensome non-fatal health condition for over 25 years, and that the treatments that are available are not very effective, clearly points to the need for innovative approaches. The most eye-catching innovations of the last decade have taken novel approaches to the intervertebral disk, but the disconnect between back pain and structural pathology of the spine suggest that the impact of any so targeted approaches will be limited...
November 21, 2016: Pain
https://www.readbyqxmd.com/read/27875479/development-and-validation-of-a-short-form-pain-medication-attitudes-questionnaire-pmaq-14
#9
James Elander, Omimah Said, Frances A Maratos, Ada Dys, Hannah Collins, Malcolm B Schofield
Attitudes to pain medication are important aspects of adjustment to chronic pain. They are measured by the 47-item Pain Medication Attitudes Questionnaire (PMAQ). To measure those attitudes more quickly and easily, we developed and evaluated a 14-item PMAQ using data from three separate surveys of people with pain in the general population. In survey 1, participants (n=295) completed the 47-item PMAQ and measures of pain, analgesic use, analgesic dependence and attitudes to self-medication. For each of the seven PMAQ scales, the two items that best preserved the content of the full parent scales were identified using correlation and regression...
November 21, 2016: Pain
https://www.readbyqxmd.com/read/27749607/identifying-patients-with-chronic-widespread-pain-in-primary-care
#10
Kathryn E Mansfield, Julius Sim, Peter Croft, Kelvin P Jordan
Chronic widespread pain (CWP) is common in the general population. It is unclear how people reporting this problem present in primary care; they may regularly consult for regional pains without being recognized as having a generalized condition. Our objectives were to determine the prevalence of people consulting in primary care for musculoskeletal conditions in different body regions on different occasions (recurrent regional pain consultation), the proportion with diagnosed generalized pain and survey-reported widespread pain, and if they have features characteristic of CWP...
November 21, 2016: Pain
https://www.readbyqxmd.com/read/27898492/growth-hormone-regulates-the-sensitization-of-developing-peripheral-nociceptors-during-cutaneous-inflammation
#11
Xiaohua Liu, Kathryn J Green, Zachary K Ford, Luis F Queme, Peilin Lu, Jessica L Ross, Frank B Lee, Aaron T Shank, Renita C Hudgins, Michael P Jankowski
Cutaneous inflammation alters the function of primary afferents and gene expression in the affected dorsal root ganglia (DRGs). However specific mechanisms of injury-induced peripheral afferent sensitization and behavioral hypersensitivity during development are not fully understood. Recent studies in children suggest a potential role for growth hormone (GH) in pain modulation. GH modulates homeostasis and tissue repair after injury, but how GH effects nociception in neonates is not known. To determine if GH played a role in modulating sensory neuron function and hyper-responsiveness during skin inflammation in young mice, we examined behavioral hypersensitivity and the response properties of cutaneous afferents using an ex vivo hairy skin-saphenous nerve-dorsal root ganglion (DRG)-spinal cord preparation...
November 18, 2016: Pain
https://www.readbyqxmd.com/read/27898491/psychosocial-factors-predict-opioid-analgesia-via-endogenous-opioid-function
#12
John W Burns, Stephen Bruehl, Christopher R France, Erik Schuster, Daria Orlowska, Asokumar Buvanendran, Melissa Chont, Rajnish K Gupta
Use of opioid analgesics for management of chronic nonmalignant pain has become common, yet there are presently no well-validated predictors of optimal opioid analgesic efficacy. We examined whether psychosocial factors (e.g. depressive symptoms) predicted changes in spontaneous low back pain following administration of opioid analgesics, and whether endogenous opioid (EO) function mediated these relationships. Participants with chronic low back pain but who were not chronic opioid users (N = 89) underwent assessment of low back pain intensity pre- and post-drug in three (counterbalanced) conditions: 1) placebo, 2) intravenous naloxone, 3) intravenous morphine...
November 18, 2016: Pain
https://www.readbyqxmd.com/read/27870648/facilitated-temporal-summation-of-pain-correlates-with-clinical-pain-intensity-after-hip-arthroplasty
#13
Masashi Izumi, Kristian Kjær Petersen, Mogens Berg Laursen, Lars Arendt-Nielsen, Thomas Graven-Nielsen
Widespread hyperalgesia has been found in patients with painful hip osteoarthritis (OA) which can be normalized after total hip arthroplasty (THA) if patients have no residual postoperative pain. This study characterized the preoperative somatosensory profiles and provided possible interpretation of underlying pain mechanisms that might influence the development of postoperative pain. Forty hip OA patients with unilateral pain were assessed before and 6 weeks post-THA and compared with forty asymptomatic control subjects...
November 17, 2016: Pain
https://www.readbyqxmd.com/read/27849648/amygdala-mediated-mechanisms-regulate-visceral-hypersensitivity-in-adult-females-following-early-life-stress-importance-of-the-glucocorticoid-receptor-and-corticotropin-releasing-factor
#14
Dawn K Prusator, Beverley Greenwood-Van Meerveld
Alterations in amygdala activity are apparent in women who report a history of early life stress (ELS) as well as those diagnosed with chronic pain disorders. Chronic stress in adulthood induces visceral hypersensitivity via alterations in glucocorticoid receptor (GR) and corticotropin-releasing factor (CRF) expression within the central amygdala (CeA). Here we hypothesized that unpredictable ELS, previously shown to induce visceral hypersensitivity in adult female rats, alters GR and CRF expression in the CeA...
November 14, 2016: Pain
https://www.readbyqxmd.com/read/27831963/long-term-use-of-opioids-for-non-malignant-pain-among-community-dwelling-persons-with-and-without-alzheimer-s-disease-in-finland-a-nationwide-register-based-study
#15
Aleksi Hamina, Heidi Taipale, Antti Tanskanen, Anna-Maija Tolppanen, Niina Karttunen, Liisa Pylkkänen, Jari Tiihonen, Sirpa Hartikainen
Persons with Alzheimer's disease (AD) commonly present with chronic non-malignant pain, but long-term use of opioids among this population has not been studied previously. Our aim was to investigate the prevalence of long-term (≥180 days) use of opioids for non-malignant pain and associated factors among community-dwelling persons with AD and to compare the prevalence to a matched cohort without AD.Medication use and Alzheimer's disease (MEDALZ) cohort was utilized for this study, comprising all community-dwelling persons diagnosed with AD in Finland during 2005-2011 and their matched comparison persons without AD...
November 4, 2016: Pain
https://www.readbyqxmd.com/read/27893485/peripheral-neuropathic-pain-a-mechanism-related-organizing-principle-based-on-sensory-profiles
#16
Ralf Baron, Christoph Maier, Nadine Attal, Andreas Binder, Didier Bouhassira, Giorgio Cruccu, Nanna B Finnerup, Maija Haanpää, Per Hansson, Philipp Hüllemann, Troels S Jensen, Rainer Freynhagen, Jeffrey D Kennedy, Walter Magerl, Tina Mainka, Maren Reimer, Andrew S C Rice, Märta Segerdahl, Jordi Serra, Sören Sindrup, Claudia Sommer, Thomas Tölle, Jan Vollert, Rolf-Detlef Treede
Patients with neuropathic pain are heterogeneous in etiology, pathophysiology and clinical appearance. They exhibit a variety of pain-related sensory symptoms and signs (sensory profile). Different sensory profiles might indicate different classes of neurobiological mechanisms and hence subgroups with different sensory profiles might respond differently to treatment.The aim of the investigation was to identify subgroups in a large sample of neuropathic pain patients using hypothesis-free statistical methods on the database of three large multi-national research networks (German Research Network on Neuropathic Pain (DFNS), IMI-Europain, Neuropain)...
November 3, 2016: Pain
https://www.readbyqxmd.com/read/27805929/genetic-variant-rs3750625-in-the-3-utr-of-adra2a-affects-stress-dependent-acute-pain-severity-after-trauma-and-alters-a-microrna-34a-regulatory-site
#17
Sarah D Linnstaedt, Margaret G Walker, Kyle D Riker, Jennifer E Nyland, JunMei Hu, Catherine Rossi, Robert A Swor, Jeffrey S Jones, Luda Diatchenko, Andrey V Bortsov, David A Peak, Samuel A McLean
α2A adrenergic receptor (α2A-AR) activation has been shown in animal models to play an important role in regulating the balance of acute pain inhibition vs facilitation after both physical and psychological stress. To our knowledge, the influence of genetic variants in the gene encoding α2A-AR, ADRA2A, on acute pain outcomes in humans experiencing traumatic stress has not been assessed. In this study, we tested whether a genetic variant in the 3'UTR of ADRA2A, rs3750625, is associated with acute musculoskeletal pain (MSP) severity following motor vehicle collision (MVC, n = 948) and sexual assault (n = 84), and whether this influence was affected by stress severity...
October 25, 2016: Pain
https://www.readbyqxmd.com/read/27780180/endocrinopathies-in-women-during-opioid-therapy-cause-loss-of-androgens-fatigue-listlessness-loss-of-libido-and-quality-of-life-stop-prescribing-opioids-or-follow-the-2016-centers-for-disease-control-and-prevention-cdc-guidelines
#18
https://www.readbyqxmd.com/read/27776012/peripheral-neuropathic-changes-in-pachyonychia-congenita
#19
Baohan Pan, Kelly Byrnes, Mary Schwartz, C David Hansen, Claudia M Campbell, Malvina Krupiczojc, Michael J Caterina, Michael Polydefkis
We compared patterns of intraepidermal nerve fibers and mechanoreceptors from affected and unaffected plantar skin from patients with pachyonychia congenita (PC) and control subjects. Plantar biopsies from 10 genetically confirmed patients with PC (with a mutation in KRT6A) were performed at the ball of the foot (affected skin) and the arch (unaffected) and were compared to biopsies from corresponding locations in 10 control subjects. Tissue was processed to visualize intraepidermal nerve fibers (IENF) (PGP9...
October 20, 2016: Pain
https://www.readbyqxmd.com/read/27764037/disentangling-mood-and-pain-a-commentary-on-two-manuscripts
#20
Katherine T Martucci
No abstract text is available yet for this article.
October 17, 2016: Pain
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