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"Central Sensitization"

Ying Tang, Aiqin Chen, Yu Chen, Lixia Guo, Hengfen Dai, Yang Huang, Qianqian Chen, Chun Lin
BACKGROUND: The pathogenesis of multiple chronic visceral pain syndromes, such as irritable bowel syndrome (IBS), is not well known, and as a result current therapies are ineffective. The objective of this study was to investigate the effect of spinal protein kinase M zeta (PKMζ) on visceral pain sensitivity in rats with IBS to better understand the pathogenesis and investigate the effect of zeta inhibitory peptide (ZIP) as a therapy for chronic visceral pain. METHODS: Visceral hypersensitivity rats were produced by neonatal maternal separation (NMS)...
2016: PloS One
John Srbely, Brian Vadasz, Jay Shah, Naomi Lynn Gerber, Siddhartha Sikdar, Dinesh Kumbhare
No abstract text is available yet for this article.
November 2016: Clinical Journal of Pain
Meagan E Ita, Nathan D Crosby, Ben A Bulka, Beth A Winkelstein
STUDY DESIGN: Immunohistochemistry labeled pre- and post-synaptic structural markers to quantify excitatory and inhibitory synapses in the spinal superficial dorsal horn at 14 days after painful facet joint injury in the rat. OBJECTIVE: The objective of this study was to investigate the relationship between pain and synapse density in the spinal cord after facet injury. SUMMARY OF BACKGROUND DATA: Neck pain is a major contributor to disability and often becomes chronic...
October 17, 2016: Spine
Dokyoung Sophia You, Mary W Meagher
OBJECTIVE: Childhood adversity is a vulnerability factor for chronic pain. However, the underlying pain mechanisms influenced by childhood adversity remain unknown. The aim of the current study was to evaluate the impact of childhood adversity on dynamic pain sensitivity in young adults. METHODS: After screening for childhood adverse events and health status, healthy individuals reporting low (below median; n = 75) or high levels of adversity (the top 5%; n = 51) were invited for pain testing...
October 13, 2016: Psychosomatic Medicine
Julie M Waldfogel, Suzanne Nesbit, Steven P Cohen, Sydney M Dy
Opioids remain the mainstay of treatment for severe cancer pain, but up to 20% of patients have persistent or refractory pain despite rapid and aggressive opioid titration, or develop refractory pain after long-term opioid use. In these scenarios, alternative agents and mechanisms for analgesia should be considered. This case report describes a 28-year-old man with metastatic pancreatic neuroendocrine cancer with severe, intractable pain despite high-dose opioids including methadone and a hydromorphone patient-controlled analgesia (PCA)...
October 18, 2016: Journal of Pain & Palliative Care Pharmacotherapy
Cheng-Hua Zhou, Ming-Xing Zhang, Sha-Sha Zhou, Huan Li, Jian Gao, Lei Du, Xiao-Xing Yin
Accumulating evidence has demonstrated that epigenetic modification-mediated changes in pain-related gene expressions play an important role in the development and maintenance of neuropathic pain. Sirtuin 1 (SIRT1), anicotinamide adenosine dinucleotide (NAD)-dependent deacetylase, is involved in the development of chronic pain. Moreover, SIRT1 may be a novel therapeutic target for the prevention of type 2 diabetes mellitus (T2DM). But the role of SIRT1 in T2DM-induced neuropathic pain remains unknown. In this study, we found that spinal SIRT1 expression and activity were down-regulated significantly in high-fat-fed/low-dose STZ-induced neuropathic pain rats...
September 29, 2016: Pain
Lauren E Cornelison, Jordan L Hawkins, Paul L Durham
Orofacial pain conditions including temporomandibular joint disorder (TMD) and migraine are characterized by peripheral and central sensitization of trigeminal nociceptive neurons. Although calcitonin gene-related peptide (CGRP) is implicated in the development of central sensitization, the pathway by which elevated spinal cord CGRP levels promote peripheral sensitization of primary trigeminal nociceptive neurons is not well understood. The goal of this study was to investigate the role of CGRP in promoting bidirectional signaling within the trigeminal system to mediate sensitization of primary trigeminal ganglion nociceptive neurons...
October 13, 2016: Neuroscience
E A Joosten
Pain is a complex phenomenon and the disentangling of the underlying mechanisms, in which peripheral and central inflammation play an important role, leads to new insights and new therapeutic options. Peripheral inflammation is characterised by the release of a great variety of substances and inflammatory mediators, such as prostaglandines, cytokines and growth factors. The nociceptors at the extreme ends of the C-fibers register changes in the local milieu. It is the specific receptors and transducer proteins located on the nociceptor that cause a depolarisation and in that way send an action potential via the C-fibres to the central nervous system...
October 2016: Nederlands Tijdschrift Voor Tandheelkunde
Suzie Noten, Filip Struyf, Enrique Lluch, Marika D'Hoore, Eveline Van Looveren, Mira Meeus
BACKGROUND: Shoulder pain is a common health problem in which changes in shoulder structure cannot always explain the patient's perceived pain. Central sensitization (CS) might play a role in a subgroup of these patients. METHODS: The literature was systematically reviewed to address the role of CS in patients with shoulder pain. Electronic databases PubMed and Web of Knowledge were searched for relevant studies. RESULTS: Eighteen full-text articles were included, methodological quality was scored, and information was extracted...
October 14, 2016: Pain Practice: the Official Journal of World Institute of Pain
L Arendt-Nielsen, G-L Jiang, R DeGryse, C C Turkel
OBJECTIVES: OnabotulinumtoxinA (onabotA) attenuates peripheral nociceptive transduction and consequently neuronal firing. The aim of this mechanistic study was to evaluate the effect of intra-articular (IA) onabotA in patients with painful knee osteoarthritis (OA). METHOD: We conducted a double-blind, randomized, placebo-controlled, 12-week trial using a single ultrasound-guided IA injection of onabotA (200 U). Patients (N = 121) were randomized to receive onabotA (n = 61) or placebo (n = 60)...
October 13, 2016: Scandinavian Journal of Rheumatology
Carolina Roza, Irene Mazo, Iván Rivera-Arconada, Elsa Cisneros, Ismel Alayón, José A López-García
The superficial dorsal horn contains large numbers of interneurons which process afferent and descending information to generate the spinal nociceptive message. Here, we set out to evaluate whether adjustments in patterns and/or temporal correlation of spontaneous discharges of these neurons are involved in the generation of central sensitization caused by peripheral nerve damage. Multielectrode arrays were used to record from discrete groups of such neurons in slices from control or nerve damaged mice. Whole-cell recordings of individual neurons were also obtained...
October 10, 2016: Pflügers Archiv: European Journal of Physiology
Sandra M Garraway, J Russell Huie
Brain-derived neurotrophic factor (BDNF) is a member of the neurotrophic factor family of signaling molecules. Since its discovery over three decades ago, BDNF has been identified as an important regulator of neuronal development, synaptic transmission, and cellular and synaptic plasticity and has been shown to function in the formation and maintenance of certain forms of memory. Neural plasticity that underlies learning and memory in the hippocampus shares distinct characteristics with spinal cord nociceptive plasticity...
2016: Neural Plasticity
Adil E Bharucha, Tae Hee Lee
Although pelvic pain is a symptom of several structural anorectal and pelvic disorders (eg, anal fissure, endometriosis, and pelvic inflammatory disease), this comprehensive review will focus on the 3 most common nonstructural, or functional, disorders associated with pelvic pain: functional anorectal pain (ie, levator ani syndrome, unspecified anorectal pain, and proctalgia fugax), interstitial cystitis/bladder pain syndrome, and chronic prostatitis/chronic pelvic pain syndrome. The first 2 conditions occur in both sexes, while the latter occurs only in men...
October 2016: Mayo Clinic Proceedings
Suku-Maran Shalini, Deron R Herr, Wei-Yi Ong
Pain and anxiety have a complex relationship and pain is known to share neurobiological pathways and neurotransmitters with anxiety. Top-down modulatory pathways of pain have been shown to originate from cortical and subcortical regions, including the dorsolateral prefrontal cortex. In this study, a novel docosahexaenoic acid (DHA)-containing nutraceutical, Souvenaid, was administered to mice with infraorbital nerve ligation-induced neuropathic pain and behavioral responses recorded. Infraorbital nerve ligation resulted in increased face wash strokes of the face upon von Frey hair stimulation, indicating increased nociception...
October 1, 2016: Molecular Neurobiology
Anat Galor, Roy C Levitt, Katherine T McManus, Jerry P Kalangara, Benjamin E Seiden, Jasmine J Park, Derek B Covington, Constantine D Sarantopoulos, Elizabeth R Felix
Importance: Somatosensory dysfunction likely underlies dry eye (DE) symptoms in many individuals yet remains an understudied component of the disease. Its presence has important diagnostic and therapeutic implications. Objective: To assess the integrity of nociceptive system processes in persons with DE and ocular pain using quantitative sensory testing (QST) techniques applied at a site remote from the eye. Design, Setting, and Participants: A cross-sectional study conducted at Miami Veterans Affairs Hospital included 118 individuals with a wide variety of DE symptoms and signs...
September 29, 2016: JAMA Ophthalmology
Wei Hao, Lei Chen, Li-Fang Wu, Fan Yang, Jian-Xiang Niu, Alan D Kaye, Shi-Yuan Xu
BACKGROUND: Cancer-induced bone pain (CIBP) is a common chronic pain characterized by 2 components, ongoing pain and breakthrough pain. Tanshinone IIA (TSN IIA) is a bioactive constituent of the traditional Chinese medicine Danshen, which has been reported to have an antinociceptive effect on neuropathic and inflammatory pain through downregulation of the late proinflammatory cytokine high-mobility group protein B1 (HMGB1). OBJECTIVE: To assess the antinociceptive effect of TSN IIA on CIBP...
September 2016: Pain Physician
Victoria C Whitehair, Richard D Wilson
No abstract text is available yet for this article.
September 2016: PM & R: the Journal of Injury, Function, and Rehabilitation
Malvin N Janal, Karen G Raphael, Dane B Cook, David A Sirois, Lena Nemelivsky, Roland Staud
INTRODUCTION: Chronic myofascial temporomandibular disorders (TMD) may have multiple etiological and maintenance factors. One potential factor, central pain sensitization, was quantified here as the response to the temporal summation (TS) paradigm, and that response was compared between case and control groups. OBJECTIVES: As previous research has shown that fibromyalgia (FM) is diagnosed iñ20% of TMD patients, Aim 1 determined whether central sensitization is found preferentially in myofascial TMD cases that have orofacial pain as a regional manifestation of FM...
2016: Journal of Pain Research
Yung-Jen Huang, Kuan H Lee, Lauren Murphy, Sandra M Garraway, James W Grau
Noxious input can sensitize pain (nociceptive) circuits within the spinal cord, inducing a lasting increase in spinal cord neural excitability (central sensitization) that is thought to contribute to chronic pain. The development of spinally-mediated central sensitization is regulated by descending fibers and GABAergic interneurons. The current study provides evidence that spinal cord injury (SCI) transforms how GABA affects nociceptive transmission within the spinal cord, recapitulating an earlier developmental state wherein GABA has an excitatory effect...
November 2016: Experimental Neurology
R Rolke, S Rolke, S Hiddemann, M Mücke, H Cuhls, L Radbruch, F Elsner, V Peuckmann-Post
Cancer pain and pain associated with non-neoplastic diseases can be associated with pain mechanisms, such as a peripheral or central sensitization or deafferentation. The clarification allows indirect conclusions about the underlying mechanisms based on clinical signs, such as allodynia or hyperalgesia. Non-opioid analgesics are the basis of cancer pain therapy according to the World Health Organization (WHO) pain ladder. In the case of severe cancer pain, treatment can be escalated directly from level 1 to level 3...
October 2016: Der Internist
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