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https://www.readbyqxmd.com/read/27920803/bone-pain-mechanism-in-osteoporosis-a-narrative-review
#1
REVIEW
Consalvo Mattia, Flaminia Coluzzi, Ludovica Celidonio, Renato Vellucci
Bone pain in elderly people dramatically affects their quality of life, with osteoporosis being the leading cause of skeletal related events. Peripheral and central mechanisms are involved in the pathogenesis of the nervous system sensitization. Osteoporosis in the elderly has been associated with increased density of bone sensory nerve fibers and their pathological modifications, together with an over-expression of nociceptors sensitized by the lowering pH due to the osteoclastic activity. The activation of N-methyl-D-aspartate (NMDA) receptors and the microglia, as a response to a range of pathological conditions, represent the leading cause of central sensitization...
May 2016: Clinical Cases in Mineral and Bone Metabolism
https://www.readbyqxmd.com/read/27919775/behavioral-inhibition-and-behavioral-activation-are-related-to-habituation-of-nociceptive-flexion-reflex-but-not-pain-ratings
#2
P Maxwell Slepian, Christopher R France, Jamie L Rhudy, Lina K Himawan, Yvette M Güereca, Bethany L Kuhn, Shreela Palit
: Habituation (i.e., decreases in responding) and sensitization (i.e., increases in responding) following prolonged or repeated exposures to a fixed stimulus, have been identified as important in adaptation to repeated or prolonged noxious stimulation. Determinants of habituation or sensitization are poorly understood, and experimental investigation of habituation of pain ratings have generally relied on pain reports and statistical techniques that average responses across a group of participants...
December 2, 2016: Journal of Pain: Official Journal of the American Pain Society
https://www.readbyqxmd.com/read/27919018/trigeminal-nervous-system-sensitization-by-infraorbital-nerve-injury-enhances-responses-in-a-migraine-model
#3
Midori Toyama, Chiho Kudo, Chikako Mukai, Mika Inoue, Aiko Oyamaguchi, Hiroshi Hanamoto, Mitsutaka Sugimura, Hitoshi Niwa
BACKGROUND: Although the peripheral and central sensitizations of trigeminal nervous system may be one of the important factors of migraine, the precise mechanism is not fully understood. In this study, we examined the influence of the sensitization of the second division of the trigeminal nerve (V2) by chronic constriction injury (CCI) of the infraorbital nerve (ION) on migraine headache, using the capsaicin-induced migraine model. METHODS: Male Sprague-Dawley rats were assigned to four groups: (a) sham surgery and topical-dural vehicle application (Sham + Vehicle) group, (b) CCI-ION and topical-dural vehicle application (CCI-ION + Vehicle) group, (c) sham surgery and topical-dural capsaicin application (Sham + Capsaicin) group, (d) CCI-ION and topical-dural capsaicin application (CCI-ION + Capsaicin) group...
November 9, 2016: Cephalalgia: An International Journal of Headache
https://www.readbyqxmd.com/read/27919017/effects-of-kynurenic-acid-analogue-1-kyna-a1-in-nitroglycerin-induced-hyperalgesia-targets-and-anti-migraine-mechanisms
#4
Rosaria Greco, Chiara Demartini, Anna Maria Zanaboni, Elisa Redavide, Selena Pampalone, Joseph Toldi, Ferenc Fülöp, Fabio Blandini, Giuseppe Nappi, Giorgio Sandrini, László Vécsei, Cristina Tassorelli
BACKGROUND: Trigeminal sensitization represents a major mechanism underlying migraine attacks and their recurrence. Nitroglycerin (NTG) administration provokes spontaneous migraine-like headaches and in rat, an increased sensitivity to the formalin test. Kynurenic acid (KYNA), an endogenous regulator of glutamate activity and its analogues attenuate NTG-induced neuronal activation in the nucleus trigeminalis caudalis (NTC). The anti-hyperalgesic effect of KYNA analogue 1 (KYNA-A1) was investigated on animal models specific for migraine pain...
November 14, 2016: Cephalalgia: An International Journal of Headache
https://www.readbyqxmd.com/read/27917120/analysis-of-nociceptive-information-encoded-in-the-temporal-discharge-patterns-of-cutaneous-c-fibers
#5
Kyeongwon Cho, Jun Ho Jang, Sung-Phil Kim, Sang Hoon Lee, Soon-Cheol Chung, In Young Kim, Dong Pyo Jang, Sung Jun Jung
The generation of pain signals from primary afferent neurons is explained by a labeled-line code. However, this notion cannot apply in a simple way to cutaneous C-fibers, which carry signals from a variety of receptors that respond to various stimuli including agonist chemicals. To represent the discharge patterns of C-fibers according to different agonist chemicals, we have developed a quantitative approach using three consecutive spikes. By using this method, the generation of pain in response to chemical stimuli is shown to be dependent on the temporal aspect of the spike trains...
2016: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/27917114/differential-responses-of-thalamic-reticular-neurons-to-nociception-in-freely-behaving-mice
#6
Yeowool Huh, Jeiwon Cho
Pain serves an important protective role. However, it can also have debilitating adverse effects if dysfunctional, such as in pathological pain conditions. As part of the thalamocortical circuit, the thalamic reticular nucleus (TRN) has been implicated to have important roles in controlling nociceptive signal transmission. However studies on how TRN neurons, especially how TRN neuronal subtypes categorized by temporal bursting firing patterns-typical bursting, atypical bursting and non-bursting TRN neurons-contribute to nociceptive signal modulation is not known...
2016: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/27916557/histone-acetylation-and-histone-deacetylation-in-neuropathic-pain-an-unresolved-puzzle
#7
REVIEW
Ravneet Kaur Khangura, Anjana Bali, Amteshwar Singh Jaggi, Nirmal Singh
Chronic pain is broadly classified into somatic, visceral or neuropathic pain depending upon the location and extent of pain perception. Evidences from different animal studies suggest that inflammatory or neuropathic pain is associated with altered acetylation and deacetylation of histone proteins, which result in abnormal transcription of nociceptive processing genes. There have been a number of studies indicating that nerve injury up-regulates histone deacetylase enzymes, which leads to increased histone deacetylation and induce chronic pain...
December 2, 2016: European Journal of Pharmacology
https://www.readbyqxmd.com/read/27916440/characterisation-of-peroxisome-proliferator-activated-receptor-signalling-in-the-midbrain-periaqueductal-grey-of-rats-genetically-prone-to-heightened-stress-negative-affect-and-hyperalgesia
#8
Bright N Okine, Jessica C Gaspar, Manish K Madasu, Weredeselam M Olango, Brendan Harhen, Michelle Roche, David P Finn
The stress-hyperresponsive Wistar-Kyoto (WKY) rat strain exhibits a hyperalgesic phenotype and is a useful genetic model for studying stress-pain interactions. Peroxisome proliferator-activated receptor (PPAR) signalling in the midbrain periaqueductal grey (PAG) modulates pain. This study characterised PPAR signalling in the PAG of WKY rats exposed to the formalin test of inflammatory pain, versus Sprague-Dawley (SD) controls. Formalin injection reduced levels of the endogenous PPAR ligands N-palmitoylethanolamide (PEA) and N-oleoylethanolamide (OEA) in the lateral(l) PAG of SD rats, but not WKY rats which exhibited higher levels of these analytes compared with formalin-injected SD counterparts...
December 1, 2016: Brain Research
https://www.readbyqxmd.com/read/27913797/promoting-gait-recovery-and-limiting-neuropathic-pain-after-spinal-cord-injury-two-sides-of-the-same-coin
#9
Catherine Mercier, Meyke Roosink, Jason Bouffard, Laurent J Bouyer
Most persons living with a spinal cord injury experience neuropathic pain in the months following their lesion, at the moment where they receive intensive gait rehabilitation. Based on studies using animal models, it has been proposed that central sensitization in nociceptive pathways (maladaptive plasticity) and plasticity related to motor learning (adaptive plasticity) share common neural mechanisms and compete with each other. This article aims to address the discrepancy between the growing body of basic science literature supporting this hypothesis and the general belief in rehabilitation research that pain and gait rehabilitation represent two independent problems...
December 2, 2016: Neurorehabilitation and Neural Repair
https://www.readbyqxmd.com/read/27913310/targeted-disruption-of-the-orphan-receptor-gpr151-does-not-alter-pain-related-behaviour-despite-a-strong-induction-in-dorsal-root-ganglion-expression-in-a-model-of-neuropathic-pain
#10
Fiona E Holmes, Niall Kerr, Ying-Ju Chen, Penny Vanderplank, Craig A McArdle, David Wynick
BACKGROUND: Gpr151 is an orphan GPCR whose function is unknown. The restricted pattern of neuronal expression in the habenula, dorsal horn of the spinal cord and dorsal root ganglion plus homology with the galanin family of receptors imply a role in nociception. RESULTS: Real-time quantitative RT-PCR demonstrated a 49.9±2.9 fold highly significant (P<0.001) increase in Gpr151 mRNA expression in the dorsal root ganglion 7days after the spared nerve injury model of neuropathic pain...
November 29, 2016: Molecular and Cellular Neurosciences
https://www.readbyqxmd.com/read/27912032/pain-input-impairs-recovery-after-spinal-cord-injury-treatment-with-lidocaine
#11
Joel D Turtle, Misty M Strain, Miriam Aceves, Yung-Jen Huang, Joshua A Reynolds, Michelle A Hook, James W Grau
More than 90% of spinal cord injuries are caused by traumatic accidents and are often associated with other tissue damage (polytrauma) that can provide a source of continued pain input during recovery. In a clinically relevant spinal cord contusion injury model, prior work has shown that noxious stimulation at an intensity that engages pain (C) fibers soon after injury augments secondary injury and impairs functional recovery. Noxious input increases the expression of pro-inflammatory cytokines (interleukin 1β and 18), cellular signals associated with cell death (caspase 3 and 8), and physiological signs of hemorrhage...
December 2, 2016: Journal of Neurotrauma
https://www.readbyqxmd.com/read/27910097/chronic-migraine-an-update-on-physiology-imaging-and-the-mechanism-of-action-of-two-available-pharmacologic-therapies
#12
Sheena K Aurora, Mitchell F Brin
Several lines of research support the hypothesis that migraine is a spectrum of illness, with clinical symptoms that vary along a continuum from episodic migraine to chronic migraine. Physiologic changes may result in episodic migraine evolving into chronic migraine over months to years in susceptible individuals. With chronification, headache frequency increases, becoming more disabling and less responsive to therapy. Neurophysiologic and functional imaging research has reported that chronic migraine may be associated with severity-specific metabolic, functional, and structural abnormalities in the brainstem...
December 2, 2016: Headache
https://www.readbyqxmd.com/read/27909152/involvement-of-mesolimbic-dopaminergic-network-in-neuropathic-pain-relief-by-treadmill-exercise-a-study-for-specific-neural-control-with-gi-dreadd-in-mice
#13
Kenta Wakaizumi, Takashige Kondo, Yusuke Hamada, Michiko Narita, Rui Kawabe, Hiroki Narita, Moe Watanabe, Shigeki Kato, Emiko Senba, Kazuto Kobayashi, Naoko Kuzumaki, Akihiro Yamanaka, Hiroshi Morisaki, Minoru Narita
BACKGROUND: Exercise alleviates pain and it is a central component of treatment strategy for chronic pain in clinical setting. However, little is known about mechanism of this exercise-induced hypoalgesia. The mesolimbic dopaminergic network plays a role in positive emotions to rewards including motivation and pleasure. Pain negatively modulates these emotions, but appropriate exercise is considered to activate the dopaminergic network. We investigated possible involvement of this network as a mechanism of exercise-induced hypoalgesia...
2016: Molecular Pain
https://www.readbyqxmd.com/read/27909035/randomised-controlled-pilot-study-to-investigate-the-effectiveness-of-thoracic-epidural-and-paravertebral-blockade-in-reducing-chronic-post-thoracotomy-pain-topic-feasibility-study-protocol
#14
Joyce Yeung, Teresa Melody, Amy Kerr, Babu Naidu, Lee Middleton, Kostas Tryposkiadis, Jane Daniels, Fang Gao
INTRODUCTION: Open chest surgery (thoracotomy) is considered the most painful of surgical procedures. Forceful wound retraction, costochondral dislocation, posterior costovertebral ligament disruption, intercostal nerve trauma and wound movement during respiration combine to produce an acute, severe postoperative pain insult and persistent chronic pain many months after surgery is common. Three recent systematic reviews conclude that unilateral continuous paravertebral blockade (PVB) provides analgesia at least equivalent to thoracic epidural blockade (TEB) in the postoperative period, has a lower failure rate, and symptom relief that lasted months...
December 1, 2016: BMJ Open
https://www.readbyqxmd.com/read/27906752/recent-developments-in-emerging-therapeutic-targets-of-osteoarthritis
#15
Margaret Man-Ger Sun, Frank Beier, Michael A Pest
PURPOSE OF REVIEW: Despite the tremendous individual suffering and socioeconomic burden caused by osteoarthritis, there are currently no effective disease-modifying treatment options. This is in part because of our incomplete understanding of osteoarthritis disease mechanism. This review summarizes recent developments in therapeutic targets identified from surgical animal models of osteoarthritis that provide novel insight into osteoarthritis pathology and possess potential for progression into preclinical studies...
January 2017: Current Opinion in Rheumatology
https://www.readbyqxmd.com/read/27904941/trpa1-substance-p-histamine-and-5-hydroxytryptamine-interact-in-an-interdependent-way-to-induce-nociception
#16
Luana Fischer, Maria Isabel Lavoranti, Mariana de Oliveira Borges, Alana Farias Miksza, Natalia Fantin Sardi, Bruno Jacson Martynhak, Claudia H Tambeli, Carlos Amílcar Parada
BACKGROUND: Although TRPA1, SP, histamine and 5-hydroxytryptamine (5-HT) have recognized contribution to nociceptive mechanisms, little is known about how they interact with each other to mediate inflammatory pain in vivo. In this study we evaluated whether TRPA1, SP, histamine and 5-HT interact, in an interdependent way, to induce nociception in vivo. METHODS AND RESULTS: The subcutaneous injection of the TRPA1 agonist allyl isothiocyanate (AITC) into the rat's hind paw induced a dose-dependent and short lasting behavioral nociceptive response that was blocked by the co-administration of the TRPA1 antagonist, HC030031, or by the pretreatment with antisense ODN against TRPA1...
November 30, 2016: Inflammation Research: Official Journal of the European Histamine Research Society ... [et Al.]
https://www.readbyqxmd.com/read/27904914/testicular-infarction-in-a-patient-with-spinal-cord-injury-with-epididymitis-a-case-report
#17
Po-Cheng Hsu, William J Huang, Shih-Fong Huang
: O-bjective: To describe a case of epididymitis-related testicular infarction in a patient with spinal cord injury. CASE REPORT: A 22-year-old man with a traumatic spinal cord injury (American Spinal Injury Association Impairment Scale A; neurological level, C4) developed epididymitis during hospitalization. He presented with spiking fever, autonomic dysreflexia, and increased spasticity. Physical examination revealed a rapidly progressive, firm swelling of the right hemiscrotum; however, the patient had no subjective complaint of pain owing to a loss of sensation...
November 30, 2016: Journal of Rehabilitation Medicine
https://www.readbyqxmd.com/read/27904505/composition-and-biological-activities-of-the-aqueous-extracts-of-three-scleractinian-corals-from-the-mexican-caribbean-pseudodiploria-strigosa-porites-astreoides-and-siderastrea-siderea
#18
Alejandro García-Arredondo, Alejandra Rojas-Molina, César Ibarra-Alvarado, Fernando Lazcano-Pérez, Roberto Arreguín-Espinosa, Judith Sánchez-Rodríguez
BACKGROUND: Scleractinian corals (stony corals) are the most abundant reef-forming cnidarians found in coral reefs throughout the world. Despite their abundance and ecological importance, information about the diversity of their toxins and their biological activities is very scarce. In this study, the chemical composition and the biological activities of the aqueous extracts of Pseudodiploria strigosa, Porites astreoides and Siderastrea siderea, three scleractinian corals from the Mexican Caribbean, have been assessed for the first time...
2016: Journal of Venomous Animals and Toxins Including Tropical Diseases
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
#19
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/27901476/the-change-of-hcn1-hcn2-mrna-expression-in-peripheral-nerve-after-chronic-constriction-injury-induced-neuropathy-followed-by-pulsed-electromagnetic-field-therapy
#20
Hui Liu, Jun Zhou, Lianbing Gu, Yunxia Zuo
Neuropathic pain is usually defined as a chronic pain state caused by peripheral or central nerve injury as a result of acute damage or systemic diseases. It remains a difficult disease to treat. Recent studies showed that the frequency of action potentials in nociceptive afferents is affected by the activity of hyperpolarization-activated cyclic nucleotide-gated cation channels (HCN) family. In the current study, we used a neuropathy rat model induced by chronic constriction injury (CCI) of sciatic nerve to evaluate the change of expression of HCN1/HCN2 mRNA in peripheral nerve and spinal cord...
November 25, 2016: Oncotarget
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