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"Central Sensitization"

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https://www.readbyqxmd.com/read/28432601/neuropathic-pain-central-vs-peripheral-mechanisms
#1
REVIEW
Kathleen Meacham, Andrew Shepherd, Durga P Mohapatra, Simon Haroutounian
PURPOSE OF REVIEW: Our goal is to examine the processes-both central and peripheral-that underlie the development of peripherally-induced neuropathic pain (pNP) and to highlight recent evidence for mechanisms contributing to its maintenance. While many pNP conditions are initiated by damage to the peripheral nervous system (PNS), their persistence appears to rely on maladaptive processes within the central nervous system (CNS). The potential existence of an autonomous pain-generating mechanism in the CNS creates significant implications for the development of new neuropathic pain treatments; thus, work towards its resolution is crucial...
June 2017: Current Pain and Headache Reports
https://www.readbyqxmd.com/read/28419379/central-sensitization-is-modulated-following-trigger-point-anesthetization-in-patients-with-chronic-pain-from-whiplash-trauma-a-double-blind-placebo-controlled-crossover-study
#2
N Ake Nystrom, Michael D Freeman
Objective. : Central sensitization (CS) with low peripheral pain thresholds (PPTs) is a common finding among patients with chronic pain after whiplash (CPWI). While it has been proposed that myofascial myofascial trigger points (MTrPs) may act as modulators of central sensitization, previously reported findings are conflicting and inconclusive. The present study was designed to investigate immediate responsiveness of CS to alterations in nociceptive input. Design.:  Controlled, double-blind, cross-over...
April 17, 2017: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/28417083/effects-of-turmeric-curcuminoids-and-metformin-against-central-sensitivity-to-pain-in-mice
#3
Suruchi Verma, Deepak Mundkinajeddu, Amit Agarwal, Shyam Sunder Chatterjee, Vikas Kumar
The reported experimental study was conducted to compare the effects of repeated daily oral doses of curcuminoids (CLE) with metformin as potential antidepressants and analgesics. Effects of a single and ten daily oral doses of CLE (5, 20, 80 mg/kg/day) and of 50 mg/kg/day metformin (MET) were compared in mice hot plate test (HPT) for analgesics. On the 11th treatment day, all animals were subjected to foot shock stress triggered hyperthermia test, and on the 12th treatment day to tail suspension test (TST) for antidepressants...
April 2017: Journal of Traditional and Complementary Medicine
https://www.readbyqxmd.com/read/28413058/erythromelalgia-identification-of-a-corticosteroid-responsive-subset
#4
Gabriel L Pagani-Estévez, Paola Sandroni, Mark D Davis, James C Watson
BACKGROUND: Corticosteroids (CS) may benefit certain patients with erythromelalgia. OBJECTIVES: Our objective was to determine clinical predictors of corticosteroid-responsive erythromelalgia. METHODS: Patients with erythromelalgia who received CS were identified and stratified into corticosteroid nonresponders (NRs), partial corticosteroid responders (PSRs), complete corticosteroid responders (CSRs), and steroid responders (SRs = PSRs + CSRs)...
March 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/28403431/differences-between-women-with-traumatic-and-idiopathic-chronic-neck-pain-and-women-without-neck-pain-interrelationships-among-disability-cognitive-deficits-and-central-sensitization
#5
Iris Coppieters, Robby De Pauw, Jeroen Kregel, Anneleen Malfliet, Dorien Goubert, Dorine Lenoir, Barbara Cagnie, Mira Meeus
Background: To date, a clear differentiation of disability, cognitive deficits, and central sensitization between chronic neck pain of a traumatic nature and that of a nontraumatic nature is lacking. Objective: This study aimed to examine differences in disability, cognitive deficits, and central sensitization between women with traumatic and idiopathic (nontraumatic) chronic neck pain and women who were healthy. In addition, interrelationships among these variables were investigated...
March 1, 2017: Physical Therapy
https://www.readbyqxmd.com/read/28394827/fibromyalgia-a-missed-comorbidity-in-spondyloarthritis-prevalence-and-impact-on-assessment-and-treatment
#6
Philip J Mease
PURPOSE OF REVIEW: Fibromyalgia is a clinical representation of the neurobiological phenomenon of central sensitization, characterized by chronic widespread pain, fatigue, sleep disturbance, and other symptoms. Fibromyalgia may occur in conjunction with chronic rheumatic diseases, driven by the effects of chronic pain and inflammation and likely influenced by the patient's genetic and psychoemotional background. This article reviews the data on prevalence of concomitant fibromyalgia and its impact on disease assessment in patients with spondyloarthritis (SpA) and psoriatic arthritis (PsA)...
April 7, 2017: Current Opinion in Rheumatology
https://www.readbyqxmd.com/read/28393079/tyrosine-phosphorylation-of-nr2b-contributes-to-chronic-migraines-via-increased-expression-of-cgrp-in-rats
#7
Xiping Liang, Sha Wang, Guangcheng Qin, Jingmei Xie, Ge Tan, Jiying Zhou, Devin W McBride, Lixue Chen
Tyrosine phosphorylation of NR2B (NR2B-pTyr), a subunit of the N-methyl-D-aspartate (NMDA) receptor, has been reported to develop central sensitization and persistent pain in the spine, but its effect in chronic migraines has not been examined. We hypothesized that tyrosine phosphorylation of NR2B contributes to chronic migraines (CM) through calcitonin gene-related peptide (CGRP) in rats. Ninety-four male Sprague-Dawley rats were subjected to seven inflammatory soup (IS) injections. In a subset of animals, the time course and location of NR2B tyrosine phosphorylation were detected by western blot and immunofluorescence double staining...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28387834/pain-extent-is-associated-with-the-emotional-and-physical-burdens-of-chronic-tension-type-headache-but-not-with-depression-or-anxiety
#8
María Palacios-Ceña, Marco Barbero, Deborah Falla, Filippo Ghirlanda, Lars Arend-Nielsen, César Fernández-de-Las-Peñas
Objective.:  Earlier studies suggest that pain extent, extracted from the patients' pain drawings, can help clinicians to identify people with central sensitization or worse clinical features. Our aim was to investigate possible associations between perceived pain extent and clinical pain features, burden of headache, psychological outcomes, and pressure sensitivity in people with chronic tension-type headache (CTTH). Methods.:  Ninety-nine people (27% men) with CTTH reported their pain on four different body charts representing the head and neck...
April 6, 2017: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/28377693/inhibition-of-mammalian-target-of-rapamycin-mtor-signaling-in-the-insular-cortex-alleviates-neuropathic-pain-after-peripheral-nerve-injury
#9
Minjee Kwon, Jeongsoo Han, Un Jeng Kim, Myeounghoon Cha, Sun Woo Um, Sun Joon Bai, Seong-Karp Hong, Bae Hwan Lee
Injury of peripheral nerves can trigger neuropathic pain, producing allodynia and hyperalgesia via peripheral and central sensitization. Recent studies have focused on the role of the insular cortex (IC) in neuropathic pain. Because the IC is thought to store pain-related memories, translational regulation in this structure may reveal novel targets for controlling chronic pain. Signaling via mammalian target of rapamycin (mTOR), which is known to control mRNA translation and influence synaptic plasticity, has been studied at the spinal level in neuropathic pain, but its role in the IC under these conditions remains elusive...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28376513/the-role-of-environmental-stress-on-lower-urinary-tract-symptoms
#10
Melissa T Sanford, Larissa V Rodriguez
PURPOSE OF REVIEW: Lower urinary tract symptoms (LUTS) have been associated with comorbid conditions such as anxiety and depression. In addition, stress appears to influence the development or exacerbation of LUTS. This article seeks to review literature regarding the role of environmental stress on LUTS, focusing on findings presented in the last year. RECENT FINDINGS: Numerous authors have published on the impact early childhood experiences, acute and chronic stress, and psychiatric illness play in the development of LUTS...
May 2017: Current Opinion in Urology
https://www.readbyqxmd.com/read/28371909/responses-to-slowly-repeated-evoked-pain-stimuli-in-fibromyalgia-patients-evidence-of-enhanced-pain-sensitization
#11
Pablo de la Coba, Stephen Bruehl, María Moreno-Padilla, Gustavo A Reyes Del Paso
Objective. : The pathophysiology of fibromyalgia has been related to central pain sensitization. This study tested a laboratory protocol evaluating responses to slowly repeated evoked pain stimuli (SREP) that may index central pain sensitization in fibromyalgia. Design. : A between-subjects controlled laboratory study. Subjects. : Twenty-four fibromyalgia patients and 24 healthy participants. Methods. : A SREP protocol was administered to all subjects, consisting of a single series of nine low-intensity pressure stimuli of five-second duration and thirty-second interstimulus interval...
March 24, 2017: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/28365208/postoperative-hyperalgesia-a-clinically-applicable-narrative-review
#12
REVIEW
Avi A Weinbroum
Postoperative hyperalgesia (POH) is a condition characterized by signs and symptoms of pain despite the provision of conventional analgesia. In most cases, anesthesiologists are called upon soon after surgery, but occasionally it may occur as a late event. Persistent uncontrolled pain may transform into chronic or neuropathic pain. Correct diagnosis of POH is essential since similar phenomenon may exacerbate if misdiagnosed, while proper treatment is frequently achievable by pharmacological remedies. This review will describe the causes for POH and its bio-neuro-pharmacological basis, and clinical symptoms and signs directing the physician towards correct diagnosis of this paradoxical condition of pain, as well as modes capable of preventing POH from occurring...
March 29, 2017: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/28364110/-role-of-cannabinoid-receptor-1-mediated-synaptic-plasticity-in-neuropathic-pain-and-associated-depression
#13
Wei Pan, Xingming Wang, Guangfen Zhang, Jianjun Yang
Neuropathic pain is a class of pain caused by an injury or diseases of the somatosensory system and characterized by spontaneous pain, allodynia, and hyperalgesia. It is well established that central sensitization is one of the key mechanisms underlying the development and maintenance of neuropathic pain. Cannabinoid receptor 1 (CB1R) of endocannabinoid system modulates synaptic transmission, regulates synaptic plasticity, inhibits central sensitization, and thus attenuates neuropathic pain. Recent studies have shown that activation of CB1R also involves in the relief of neuropathic pain-induced depression...
March 28, 2017: Zhong Nan da Xue Xue Bao. Yi Xue Ban, Journal of Central South University. Medical Sciences
https://www.readbyqxmd.com/read/28360534/involvement-of-endoplasmic-reticulum-stress-in-formalin-induced-pain-is-attenuated-by-4-phenylbutyric-acid
#14
Fan Zhou, Wei Zhang, Jianmei Zhou, Meirong Li, Feng Zhong, Yun Zhang, Yuezhu Liu, Yaping Wang
BACKGROUND: Endoplasmic reticulum (ER) stress is involved in many neurological and inflammatory responses. Peripheral inflammatory responses can induce central sensitization and trigger inflammatory pain. However, there is little research on the relationship between ER stress and inflammatory pain. In this study, we examined whether the ER stress response is involved in peripheral inflammatory pain using a formalin-induced rat pain model. METHODS: Rats were divided into the following five groups: control, formalin, formalin + vehicle, formalin + 4-phenylbutyric acid (4-PBA) (40 mg/kg) and formalin + 4-PBA (100 mg/kg)...
2017: Journal of Pain Research
https://www.readbyqxmd.com/read/28348505/effects-of-a-pain-catastrophizing-induction-on-sensory-testing-in-women-with-chronic-low-back-pain-a-pilot-study
#15
Chloe J Taub, John A Sturgeon, Kevin A Johnson, Sean C Mackey, Beth D Darnall
Pain catastrophizing, a pattern of negative cognitive-emotional responses to actual or anticipated pain, maintains chronic pain and undermines response to treatments. Currently, precisely how pain catastrophizing influences pain processing is not well understood. In experimental settings, pain catastrophizing has been associated with amplified pain processing. This study sought to clarify pain processing mechanisms via experimental induction of pain catastrophizing. Forty women with chronic low back pain were assigned in blocks to an experimental condition, either a psychologist-led 10-minute pain catastrophizing induction or a control (10-minute rest period)...
2017: Pain Research & Management: the Journal of the Canadian Pain Society
https://www.readbyqxmd.com/read/28337884/neurochemical-effects-of-photobiostimulation-in-the-trigeminal-ganglion-after-inferior-alveolar-nerve-injury
#16
D O Martins, F M Santos, L R G Britto, J B D Lemos, M Chacur
Orofacial pain is associated with peripheral and central sensitization of trigeminal nociceptive neurons. Nerve injury results in release of chemical mediators that contribute to persistent pain conditions. The activation of the transient receptor potential vanilloid 1 (TRPV1), promotes release of calcitonin gene-related peptide (CGRP) and substance P (SP) from trigeminal nerve terminals. CGRP and SP contribute to the development of peripheral hyperalgesia. The expression of SP and CGRP by primary afferent neurons is rapidly increased in response to peripheral inflammation...
January 2017: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/28329901/-pathophysiology-of-headaches
#17
Charly Gaul, Karl Meßlinger, Dagny Holle-Lee, Lars Neeb
Pathophysiological concepts of primary headache diseases have been developed significantly in the last decades. Nevertheless pathophysiology of single diseases is unexplained. Migraine headache arises from activation and sensibilization of trigeminal nociceptors, essential processes are located at the meninges and the meningeal vessels. Calcitonin gene-related peptide (CGRP) seems to have essential importance concerning migraine and cluster headache. Mechanisms leading to peripheral and central sensitization are relevant in chronification of migraine and tension-type headache...
March 2017: Deutsche Medizinische Wochenschrift
https://www.readbyqxmd.com/read/28321335/quantitative-thermal-testing-profiles-as-a-predictor-of-treatment-response-to-topical-capsaicin-in-patients-with-localized-neuropathic-pain
#18
A Serrano, D Torres, M Veciana, C Caro, J Montero, V Mayoral
There are no reliable predictors of response to treatment with capsaicin. Given that capsaicin application causes heat sensation, differences in quantitative thermal testing (QTT) profiles may predict treatment response. The aim of this study was to determine whether different QTT profiles could predict treatment outcomes in patients with localized peripheral neuropathic pain (PeLNP). We obtained from medical records QTT results and treatment outcomes of 55 patients treated between 2010 and 2013. Warm sensation threshold (WST) and heat pain threshold (HPT) values were assessed at baseline at the treatment site and in the asymptomatic, contralateral area...
2017: Pain Research and Treatment
https://www.readbyqxmd.com/read/28315267/pharmacological-modulation-of-the-sigma-1-receptor-and-the-treatment-of-pain
#19
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
#20
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
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