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https://www.readbyqxmd.com/read/28073317/activation-of-kcnq-channels-suppresses-spontaneous-activity-in-drg-neurons-and-reduces-chronic-pain-after-spinal-cord-injury
#1
Zizhen Wu, Lin Li, Fuhua Xie, Junhui Du, Yan Zuo, Jeffrey A Frost, Susan M Carlton, Edgar T Walters, Qing Yang
A majority of people who have sustained spinal cord injury (SCI) experience chronic pain after injury, and this pain is highly resistant to available treatments. Contusive SCI in rats at T10 results in hyperexcitability of primary sensory neurons, which contributes to chronic pain. KCNQ channels are widely expressed in nociceptive dorsal root ganglion (DRG) neurons, are important for controlling their excitability, and their activation has proven effective in reducing pain in peripheral nerve injury and inflammation models...
January 10, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28072687/the-negative-chronotropic-effect-during-lumbar-spine-surgery-a-systemic-review-and-aggregation-of-an-emerging-model-of-spinal-cardiac-reflex
#2
Tumul Chowdhury, Bernhard Schaller
BACKGROUND: Hemodynamic perturbations in spine surgeries are predominantly reported in cervical and thoracic level procedures. The literature related to negative cardiovascular changes (decrease of heart rate and blood pressure) in lumbar spine procedures is still scarce and only highlighted in few case reports/letters until now. METHODS: With the help of a systematic literature review with predefined criteria, we, therefore, examined and synthesized here the probable underlying common cause of these hemodynamic disturbances in lumbar spine surgeries...
January 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28062927/a-sensory-driven-controller-for-quadruped-locomotion
#3
César Ferreira, Cristina P Santos
Locomotion of quadruped robots has not yet achieved the harmony, flexibility, efficiency and robustness of its biological counterparts. Biological research showed that spinal reflexes are crucial for a successful locomotion in the most varied terrains. In this context, the development of bio-inspired controllers seems to be a good way to move toward an efficient and robust robotic locomotion, by mimicking their biological counterparts. This contribution presents a sensory-driven controller designed for the simulated Oncilla quadruped robot...
January 7, 2017: Biological Cybernetics
https://www.readbyqxmd.com/read/28039767/static-otolithic-drive-alters-presynaptic-inhibition-in-soleus-motor-pool
#4
Apollonia Fox, David Koceja
The vestibular system has both direct and indirect connections to the soleus motor pool via the vestibulospinal and reticulospinal tracts. The exact nature of how this vestibular information is integrated within the spinal cord is largely unknown. The purpose of this study was to identify whether changes in static otolithic drive altered the amount of presynaptic inhibition in the soleus H-reflex pathway. Changes in static otolithic drive were investigated in sixteen healthy participants using a tilt table...
December 20, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28033318/a-point-mutation-in-a-lincrna-upstream-of-gdnf-is-associated-to-a-canine-insensitivity-to-pain-a-spontaneous-model-for-human-sensory-neuropathies
#5
Jocelyn Plassais, Laetitia Lagoutte, Solenne Correard, Manon Paradis, Eric Guaguère, Benoit Hédan, Alix Pommier, Nadine Botherel, Marie-Christine Cadiergues, Philippe Pilorge, David Silversides, Maud Bizot, Mark Samuels, Carme Arnan, Rory Johnson, Christophe Hitte, Gilles Salbert, Agnès Méreau, Pascale Quignon, Thomas Derrien, Catherine André
Human Hereditary Sensory Autonomic Neuropathies (HSANs) are characterized by insensitivity to pain, sometimes combined with self-mutilation. Strikingly, several sporting dog breeds are particularly affected by such neuropathies. Clinical signs appear in young puppies and consist of acral analgesia, with or without sudden intense licking, biting and severe self-mutilation of the feet, whereas proprioception, motor abilities and spinal reflexes remain intact. Through a Genome Wide Association Study (GWAS) with 24 affected and 30 unaffected sporting dogs using the Canine HD 170K SNP array (Illumina), we identified a 1...
December 2016: PLoS Genetics
https://www.readbyqxmd.com/read/28031400/spinal-cord-direct-current-stimulation-differentially-modulates-neuronal-activity-in-the-dorsal-and-ventral-spinal-cord
#6
Weiguo Song, John H Martin
Spinal cord direct current stimulation (sDCS) has the potential for promoting motor function after injury through its modulatory actions on sensory processing, reflex functions, the motor cortex (M1) motor map, and motor output. Here we addressed systems-level mechanisms underlying sDCS neuromodulation of spinal circuits activated by M1 and peripheral forelimb electrical stimulation in anesthetized healthy rats. We determined the effects of cathodal and anodal sDCS (c- and a-sDCS) on local field potentials (LFP) and single-unit activity recorded at 32 sites simultaneously within the 6th cervical segment using a silicon multi-electrode array...
December 28, 2016: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28018472/concurrency-of-guillain-barre-syndrome-and-acute-transverse-myelitis-a-case-report-and-review-of-literature
#7
Orkun Tolunay, Tamer Çelik, Ümit Çelik, Mustafa Kömür, Zeynep Tanyeli, Abdurrahman Sönmezler
Guillain-Barré syndrome and acute transverse myelitis manifest as demyelinating diseases of the peripheral and central nervous system. Concurrency of these two disorders is rarely documented in literature. A 4-year-old girl presenting with cough, fever, and an impaired walking ability was admitted to hospital. She had no previous complaints in her medical history. A physical examination revealed lack of muscle strength of the lower extremities and deep tendon reflexes. MRI could not be carried out due to technical problems; therefore, both Guillain-Barré syndrome and acute transverse myelitis were considered for the diagnosis...
November 2016: Korean Journal of Pediatrics
https://www.readbyqxmd.com/read/28013090/walking-duration-and-slope-steepness-determine-the-effect-of-downslope-walking-on-the-soleus-h-reflex-pathway
#8
Elizabeth Arnold, Ben Farmer, Melissa Keightley, Dustin Lee, Taylor Rigel, Maruf Hoque, Manning J Sabatier
The purpose of this study was to determine if the effect of downslope walking (DSW) on spinal excitability depends on walking duration and slope steepness, and if findings from the soleus (Sol) generalize to the tibialis anterior (TA). Sol and TA Hmax and Mmax were measured before and after four DSW doses (time/slope, min/%) on separate days (10/-15, 20/-15, 10/-25, 20/-25, n=14), and one 20-min bout of level walking (LW, n=12), always at 2.5 mph. Heart rate (HR) and ratings of perceived exertion (RPE) were measured during walking...
December 21, 2016: Neuroscience Letters
https://www.readbyqxmd.com/read/28007522/the-pupillary-light-reflex-for-predicting-the-risk-of-hypotension-after-spinal-anaesthesia-for-elective-caesarean-section
#9
Céline Riffard, Truong Quoc Viêt, François-Pierrick Desgranges, Lionel Bouvet, Bernard Allaouchiche, Adrienne Stewart, Dominique Chassard
INTRODUCTION: The balance between the sympathetic and parasympathetic systems could be used to predict the onset of hypotension following spinal anaesthesia. The autonomic innervation of the pupil may reflect this balance. The aim of this study was to evaluate the ability of pupillometry to predict the risk of hypotension after spinal anaesthesia for caesarean section. METHODS: Two hundred patients receiving spinal anaesthesia for caesarean section were recruited...
December 19, 2016: Anaesthesia, Critical Care & Pain Medicine
https://www.readbyqxmd.com/read/28002640/activation-of-galanin-and-cholecystokinin-receptors-in-the-lumbosacral-spinal-cord-is-required-for-ejaculation-in-male-rats
#10
Natalie Kozyrev, Lique M Coolen
The spinal ejaculation generator is comprised of lumbar spinothalamic (LSt) cells and their axonal projections to autonomic and motor neurons in the lumbosacral spinal cord. LSt cells regulate ejaculatory reflexes by release of neuropeptides that are co-expressed in their axons, as previously demonstrated for gastrin releasing peptide and enkephalin. Here, the role of two other neuropeptides co-expressed in LSt cells for ejaculatory reflexes are demonstrated: galanin and cholecystokinin (CCK). Adult male rats were anesthetized, spinalized, and received intrathecal infusions of galanin receptor antagonist Galantide (1 or 10 nmol) or CCK receptor antagonist proglumide (71 or 714 nmol)...
December 21, 2016: European Journal of Neuroscience
https://www.readbyqxmd.com/read/27998207/application-of-the-rat-grimace-scale-as-a-marker-of-supraspinal-pain-sensation-after-cervical-spinal-cord-injury
#11
Lonnie E Schneider, Kathryn Y Henley, Omari A Turner, Betty M Pat, Tracy L Niedzielko, Candace L Floyd
Experimental models of neuropathic pain (NP) typically rely on withdrawal responses to assess the presence of pain. Reflexive withdrawal responses to a stimulus are used to evaluate evoked pain and as such do not include the assessment of spontaneous NP nor evaluation of the affective and emotional consequences of pain in animal models. Additionally, withdrawal responses can be mediated by spinal cord reflexes and may not accurately indicate supraspinal pain sensation. This is especially true in models of traumatic spinal cord injury (SCI) wherein spastic syndrome, a motor disorder characterized by exaggeration of the stretch reflex that is secondary to hyperexcitability of the spinal reflex, can cause paroxysmal withdrawals not associated with NP sensation...
December 21, 2016: Journal of Neurotrauma
https://www.readbyqxmd.com/read/27992393/manipulating-the-extracellular-matrix-an-animal-model-of-the-bladder-pain-syndrome
#12
Ifeoma Offiah, Athanasios Didangelos, Barry A OʼReilly, Stephen B McMahon
Bladder pain syndrome (BPS) is associated with breakdown of the protective uroepithelial barrier of the urinary bladder allowing urinary constituents access to bladder sensory neurons. Although there are several animal models of cystitis, none specifically relates to BPS. Here, we aimed to create such a model using enzymatic digestion of the barrier proteoglycans (PGs) in the rat. Twenty female Wistar rats were anaesthetized and transurethrally catheterized. Ten animals were treated with 0.25IU of intravesical chondroitinase ABC and heparanase III to digest chondroitin sulphate and heparin sulphate PGs, respectively...
January 2017: Pain
https://www.readbyqxmd.com/read/27989852/cortical-and-spinal-assessment-a-comparative-study-using-encephalography-and-the-nociceptive-withdrawal-reflex
#13
I W Fischer, M Gram, T M Hansen, A Brokjaer, C Graversen, L P Malver, C D Mørch, L L Christrup, A M Drewes, A E Olesen
BACKGROUND: Standardized objective methods to assess the analgesic effects of opioids, enable identification of underlying mechanisms of drug actions in the central nervous system. Opioids may exert their effect on both cortical and spinal levels. In this study actions of morphine at both levels were investigated, followed by analysis of a possible correlation between the cortical processing and spinal transmission. METHODS: The study was conducted after a double-blinded, two-way crossover design in thirty-nine healthy participants...
October 29, 2016: Journal of Pharmacological and Toxicological Methods
https://www.readbyqxmd.com/read/27981912/probing-the-human-spinal-locomotor-circuits-by-phasic-step-induced-feedback-and-by-tonic-electrical-and-pharmacological-neuromodulation
#14
Ursula S Hofstoetter, Maria Knikou, Pierre A Guertin, Karen Minassian
The mammalian lumbar spinal cord experimentally isolated from supraspinal and afferent feedback input remains capable of expressing some basic locomotor function when appropriately stimulated. This ability has been attributed to spinal neural circuits referred to as central pattern generators (CPGs). In individuals with a severe spinal cord injury, rhythmic activity in paralyzed leg muscles can be generated by phasic proprioceptive feedback during therapist- or robotic-assisted stepping on a motorized treadmill...
December 14, 2016: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/27973385/acute-corticospinal-and-spinal-modulation-after-whole-body-vibration
#15
A Krause, A Gollhofer, K Freyler, L Jablonka, R Ritzmann
OBJECTIVES: The objective of this study was to investigate neural effects of acute whole body vibration (WBV) on lower limb muscles regarding corticospinal and spinal excitability. METHODS: In 44 healthy subjects (16 f/ 28 m), motor evoked potentials (MEP) and H-reflexes in m. soleus (SOL) and gastrocnemius medialis (GM) were elicited before (t1), immediately after (t2), 2 (t3), 4 (t4) and 10 min after (t5) WBV. RESULTS: After WBV, MEP amplitudes were significantly increased in SOL (t2+15±30%, t3+22±32%, t4+15±35%, t5+20±30%, P<0...
December 14, 2016: Journal of Musculoskeletal & Neuronal Interactions
https://www.readbyqxmd.com/read/27965588/unilateral-eccentric-contraction-of-the-plantarflexors-leads-to-bilateral-alterations-in-leg-dexterity
#16
Akira Nagamori, Francisco J Valero-Cuevas, James M Finley
Eccentric contractions can affect musculotendon mechanical properties and disrupt muscle proprioception, but their behavioral consequences are poorly understood. We tested whether repeated eccentric contractions of plantarflexor muscles of one leg affected the dexterity of either leg. Twenty healthy male subjects (27.3 ± 4.0 yrs) compressed a compliant and slender spring prone to buckling with each isolated leg. The maximal instability they could control (i.e., the maximal average sustained compression force, or lower extremity dexterity force, LEDforce) quantified the dexterity of each leg...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27940753/a-5-year-old-with-fever-headache-neck-stiffness-and-leg-pain
#17
Joy Solano, Grace Winningham, Duha Al Zubeidi, Angela Myers
A 5-year-old boy presented with fever, headache, fatigue, neck stiffness, and 2 episodes of nocturnal urinary incontinence, prompting a visit to the emergency department. He had experienced intermittent frontal headaches and leg and buttock pain for several months, which had worsened over the previous 2 weeks. His history was notable for a spinal hemangioma with vascular tract, but he was otherwise healthy. On examination, he was febrile and tachycardic. He held his neck slightly rotated to the right with limited range of motion in all directions due to pain...
November 2016: Pediatrics
https://www.readbyqxmd.com/read/27935110/involvement-of-opioid-receptors-in-inhibition-of-bladder-overactivity-induced-by-sacral-neuromodulation-in-pigs-a-possible-action-mechanism
#18
Xing Li, Limin Liao, Guoqing Chen, Zhaoxia Wang, Han Deng
AIMS: To determine the role of opioid receptors in the inhibition of bladder overactivity by sacral neuromodulation (SNM) in pigs, and explore the possible mechanism of SNM. METHODS: Both implant-driven stimulators of the S3 spinal nerve were implanted in seven pigs. Naloxone and tramadol were administered. Multiple cystometrograms were performed to determine the effects of SNM and opioid receptors on the micturition reflex by infusing normal saline (NS) or acetic acid (AA)...
December 9, 2016: Neurourology and Urodynamics
https://www.readbyqxmd.com/read/27930392/pain-catastrophizing-is-not-associated-with-spinal-nociceptive-processing-in-people-with-chronic-widespread-pain
#19
David A Rice, Rosalind S Parker, Gwyn N Lewis, Michal T Kluger, Peter J McNair
OBJECTIVES: Pain catastrophizing has been associated with higher pain intensity, increased risk of developing chronic pain and poorer outcomes after pain treatments. Despite this, the mechanisms by which pain catastrophizing influences pain remain poorly understood. It has been hypothesised that pain catastrophizing may impair descending inhibition of spinal level nociception. The aims of this study were to compare spinal nociceptive processing in people with chronic widespread pain and pain free controls and examine potential relationships between measures of pain catastrophizing and spinal nociception...
December 7, 2016: Clinical Journal of Pain
https://www.readbyqxmd.com/read/27928968/rationale-for-assessing-safety-and-efficacy-of-drug-candidates-alone-and-in-combination-with-medical-devices-the-case-study-of-spinalontm
#20
Pierre A Guertin
The aim of this review is to describe the rationale and main underlying reasons for undertaking, during clinical development, the study of drug candidates used separately and/or in combination with other technologies. To ease comprehension, reference will be made to the case of SpinalonTM, a new fixed-dose combination (FDC) product composed of levodopa/carbidopa/buspirone. This drug is capable of triggering, within minutes after a single administration orally, 45 minute- episodes of basic involuntary 'reflex' walking in paraplegic animals...
December 7, 2016: Current Pharmaceutical Design
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