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Spinal modulation

Kemal Ekici, Eda K Pepele, Bahaddin Yaprak, Oztun Temelli, Aysun F Eraslan, Nadir Kucuk, Ayse Y Altınok, Pelin A Sut, Ozlem D Alpak, Cemil Colak, Alpaslan Mayadagli
Various radiotherapy planning methods for T1N0 laryngeal cancer have been proposed to decrease normal tissue toxicity. We compare helical tomotherapy (HT), linac-based intensity-modulated radiation therapy (IMRT), volumetric-modulated arc therapy (VMAT), and 3-D conformal radiotherapy (3D-CRT) techniques for T1N0 laryngeal cancer. Overall, 10 patients with T1N0 laryngeal cancer were selected and evaluated. Furthermore, 10 radiotherapy treatment plans have been created for all 10 patients, including HT, IMRT, VMAT, and 3D-CRT...
October 17, 2016: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
Ruyi Huang, Serapio M Baca, Jason W Worrell, Xingquan Liu, Yeji Seo, James C Leiter, Daniel C Lu
Respiration is produced and controlled by well-characterized brainstem nuclei, but the contributions of spinal circuits to respiratory control and modulation remain under investigation. Many respiratory studies are conducted in in vitro preparations (e.g., brainstem slice) obtained from neonatal rodents. While informative, these studies do not fully recapitulate the complex afferent and efferent neural circuits that are likely to be involved in eupnea (i.e., quiet breathing). To begin to investigate spinal contributions to respiration, we electrically stimulated the cervical spinal cord during unassisted respiration in anesthetized, intact mice...
October 7, 2016: Journal of Applied Physiology
David Reigada, Rosa María Navarro-Ruiz, Marcos Javier Caballero-López, Ángela Del Águila, Teresa Muñoz-Galdeano, Rodrigo M Maza, Manuel Nieto-Díaz
Reducing cell death during the secondary injury is a major priority in the development of a cure for traumatic spinal cord injury (SCI). One of the earliest processes that follow SCI is the excitotoxicity resulting from the massive release of excitotoxicity mediators, including ATP, which induce an excessive and/or prolonged activation of their receptors and a deregulation of the calcium homeostasis. Diadenosine tetraphosphate (Ap4A) is an endogenous purinergic agonist, present in both extracellular and intracellular fluids, with promising cytoprotective effects in different diseases including neurodegenerative processes...
October 19, 2016: Purinergic Signalling
Laurence D Picton, Keith T Sillar
Dopamine plays important roles in the development and modulation of motor control circuits. Here we show that dopamine exerts potent effects on the central pattern generator circuit controlling locomotory swimming in post-embryonic Xenopus tadpoles. Dopamine (0.5-100 μM) reduced fictive swim bout occurrence and caused both spontaneous and evoked episodes to become shorter, slower and weaker. The D2-like receptor agonist quinpirole mimicked this repertoire of inhibitory effects on swimming, whilst the D4 receptor antagonist, L745,870, had the opposite effects...
October 20, 2016: Scientific Reports
Nathan D Crosby, John J Janik, Warren M Grill
Kilohertz-frequency spinal cord stimulation (KHF-SCS) is a potential paresthesia-free treatment for chronic pain. However, the effects of KHF-SCS on spinal dorsal column (DC) axons and its mechanisms of action remain unknown. The objectives of this study were to quantify activation and conduction block of DC axons by KHF-SCS across a range of kHz frequencies (1, 5, 10, or 20 kHz) and waveforms (biphasic pulses or sinusoids). Custom platinum electrodes delivered SCS to the T10/T11 DCs of anesthetized male Sprague-Dawley rats...
October 19, 2016: Journal of Neurophysiology
Jeffrey T Ehmsen, Yong Liu, Yue Wang, Nikhil Paladugu, Anna E Johnson, Jeffrey D Rothstein, Sascha du Lac, Mark P Mattson, Ahmet Höke
SLC7A10 (Asc-1) is a sodium-independent amino acid transporter known to facilitate transport of a number of amino acids including glycine, L-serine, L-alanine, and L-cysteine, as well as their D-enantiomers. It has been described as a neuronal transporter with a primary role related to modulation of excitatory glutamatergic neurotransmission. We find that SLC7A10 is substantially enriched in a subset of astrocytes of the caudal brain and spinal cord in a distribution corresponding with high densities of glycinergic inhibitory synapses...
October 19, 2016: Scientific Reports
Erika M Palmieri, Alessio Menga, Aurore Lebrun, Douglas C Hooper, D Allan Butterfield, Massimiliano Mazzone, Alessandra Castegna
AIMS: Microglial cells are brain resident macrophages engaged in surveillance and maintained in a constant state of relative inactivity. However, their involvement in autoimmune diseases indicates that in pathological conditions microglia gain an inflammatory phenotype. The mechanisms underlying this change in the microglial phenotype are still unclear. Since metabolism is an important modulator of immune cell function, we focused our attention on glutamine synthetase (GS), a modulator of the response to LPS-activation in other cell types, which is expressed by microglia...
October 19, 2016: Antioxidants & Redox Signaling
Dong-Hee Choi, Jin-Hee Ahn, In-Ae Choi, Ji-Hye Kim, Bo-Ram Kim, Jongmin Lee
Recent evidence indicates that the ephrin receptors and ephrin ligands (Eph/ephrin) expression modulates axonal reorganization and synaptic plasticity in stroke recovery. To investigate the effect of task-specific training (TST) on Eph/ephrin expression in the corticospinal tract (CST) after stroke, we compared Eph/ephrin expression in the peri-infarct cortex, pyramid, and spinal cord of the photothrombotic stroke rats treated with or without TST. The TST treatment showed significantly better recovery in the behavioral tests...
October 19, 2016: BMB Reports
Petra Mrozkova, Diana Spicarova, Jiri Palecek
Protease-activated receptors 2 (PAR2) and transient receptor potential vanilloid 1 (TRPV1) receptors in the peripheral nerve endings are implicated in the development of increased sensitivity to mechanical and thermal stimuli, especially during inflammatory states. Both PAR2 and TRPV1 receptors are co-expressed in nociceptive dorsal root ganglion (DRG) neurons on their peripheral endings and also on presynaptic endings in the spinal cord dorsal horn. However, the modulation of nociceptive synaptic transmission in the superficial dorsal horn after activation of PAR2 and their functional coupling with TRPV1 is not clear...
2016: PloS One
Mark Driscoll, Carl-Éric Aubin, Alain Moreau, Yaroslav Wakula, Samira Amini, Stefan Parent
STUDY DESIGN: In vivo porcine model utilized to evaluate the influence of an intravertebral fusionless growth modulating device (hemi-staple) on intervertebral disks and growth plates. OBJECTIVE: To evaluate the radiographic and histologic changes in disks and growth plates with the purpose of measuring influence of the explored hemi-staple. SUMMARY OF BACKGROUND DATA: Fusionless growth modulation for the early treatment of scoliosis should insure the long-term viability of the intervertebral disk and successfully reduce or arrest local growth...
November 2016: Clinical Spine Surgery
Yasuhide Yoshitake, Hiroaki Kanehisa, Minoru Shinohara
PURPOSE: The purpose of this study was to determine the modulation of common low-frequency oscillations in pools of motor units across antagonistic muscles due to the difference in the activation level of pools of spinal motor neurons and the presence of neuromuscular fatigue during intended co-contraction. METHODS: Ten healthy young men (21.8 ± 1.5 yr) performed intended steady co-contractions of elbow flexors and extensors at maximal and a submaximal (10% of maximal electromyogram, EMG) effort...
October 6, 2016: Medicine and Science in Sports and Exercise
Norikazu Kiguchi, Huiping Ding, Christopher M Peters, Nancy D Kock, Shiroh Kishioka, J Mark Cline, Janice D Wagner, Mei-Chuan Ko
Neuroinflammation is a pathological condition that underlies diabetes and affects sensory processing. Given the high prevalence of pain in diabetic patients and crosstalk between chemokines and opioids, it is pivotal to know whether neuroinflammation-associated mediators are dysregulated in the central nervous system of diabetic primates. Therefore, the aim of this study was to investigate whether mRNA expression levels of glial markers, chemokines, and opioid receptors are altered in the spinal cord and thalamus of naturally occurring type 2 diabetic monkeys (n=7) compared with age-matched non-diabetic monkeys (n=6)...
October 14, 2016: Biochimica et Biophysica Acta
Carrie J Finno, Matthew H Bordbari, Stephanie J Valberg, David Lee, Josi Herron, Kelly Hines, Tamer Monsour, Erica Scott, Danika L Bannasch, James Mickelson, Libin Xu
Specific spontaneous heritable neurodegenerative diseases have been associated with lower serum and cerebrospinal fluid α-tocopherol (α-TOH) concentrations. Equine neuroaxonal dystrophy (eNAD) has similar histologic lesions to human ataxia with vitamin E deficiency caused by mutations in the α-TOH transfer protein gene (TTPA). Mutations in TTPA are not present with eNAD and the molecular basis remains unknown. Given the neuropathologic phenotypic similarity of the conditions, we assessed the molecular basis of eNAD by global transcriptome sequencing of the cervical spinal cord...
October 14, 2016: Free Radical Biology & Medicine
Sara Barbiero, Alexandra Rink, Fabrizio Matteucci, David Fedele, Fabiola Paiar, Francesco Pasqualetti, Michele Avanzo
PURPOSE: To report on single-fraction stereotactic body radiotherapy (RT) (SBRT) with flattening filter (FF)-free (FFF) volumetric modulated arc therapy (VMAT) for lung cancer and to compare dosimetric results with VMAT with FF. METHODS AND MATERIALS: Overall, 25 patients were treated with 6-MV FFF VMAT (Varian TrueBeam STx LINAC) to a prescribed dose of 24Gy in a single fraction. Treatment plans were recreated using FF VMAT. Dose-volume indices, monitor units (MU), and treatment times were compared between FFF and FF VMAT techniques...
October 14, 2016: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
Nikele Nadur-Andrade, Camila Squarzoni Dale, Victoria Regina da Silva Oliveira, Elaine Flamia Toniolo, Regiane Dos Santos Feliciano, José Antonio da Silva, Stella Regina Zamuner
BACKGROUND: Envenoming induced by Bothrops snakebites is characterized by drastic local tissue damage that involves an intense inflammatory reaction and local hyperalgesia which are not neutralized by conventional antivenom treatment. Herein, the effectiveness of photobiomodulation to reduce inflammatory hyperalgesia induced by Bothrops moojeni venom (Bmv), as well as the mechanisms involved was investigated. METHODOLOGY/PRINCIPAL FINDINGS: Bmv (1 μg) was injected through the intraplantar route in the right hind paw of mice...
October 2016: PLoS Neglected Tropical Diseases
D Lelic, I W D Fischer, A E Olesen, C D Mørch, F G Arguissain, J A B Manresa, A Dahan, A M Drewes
Severe pain is often treated with opioids. Antidepressants that inhibit serotonin and norepinephrine reuptake (SNRI) have also shown a pain relieving effect, but for both SNRI and opioids the specific mode of action in humans remains vague. This study investigated how oxycodone and venlafaxine affect spinal and supraspinal pain processing. Twenty volunteers were included in this randomized cross-over study comparing five-day treatment with venlafaxine, oxycodone and placebo. As a proxy of the spinal pain transmission, the nociceptive withdrawal reflex (NWR) to electrical stimulation on the sole of the foot was recorded at the tibialis anterior muscle before and after five days of treatment...
October 17, 2016: European Journal of Neuroscience
Giuseppe Lanza, Cornelius G Bachmann, Imad Ghorayeb, Yuping Wang, Raffale Ferri, Walter Paulus
Neurophysiological techniques have been applied in restless legs syndrome (RLS) to obtain direct and indirect measures of central and peripheral nervous system excitability, as well as to probe different neurotransmission pathways. Data converge on the hypothesis that, from a pure electrophysiological perspective, RLS should be regarded as a complex sensorimotor disorder in which cortical, subcortical, spinal cord, and peripheral nerve generators are all involved in a network disorder, resulting in an enhanced excitability and/or decreased inhibition...
August 27, 2016: Sleep Medicine
Dae Young Yoo, Dae Won Kim, Jin Young Chung, Hyo Young Jung, Jong Whi Kim, Yeo Sung Yoon, In Koo Hwang, Jung Hoon Choi, Goang-Min Choi, Soo Young Choi, Seung Myung Moon
In the present study, we investigated the ability of Cu, Zn-superoxide dismutase (SOD1) to improve the therapeutic potential of adipose tissue-derived mesenchymal stem cells (Ad-MSCs) against ischemic damage in the spinal cord. Animals were divided into four groups: the control group, vehicle (PEP-1 peptide and artificial cerebrospinal fluid)-treated group, Ad-MSC alone group, and Ad-MSC-treated group with PEP-1-SOD1. The abdominal aorta of the rabbit was occluded for 30 min in the subrenal region to induce ischemic damage, and immediately after reperfusion, artificial cerebrospinal fluid or Ad-MSCs (2 × 10(5)) were administered intrathecally...
October 14, 2016: Neurochemical Research
Hannes Schmidt, Stefanie Peters, Katharina Frank, Lai Wen, Robert Feil, Fritz G Rathjen
A cGMP signaling pathway, comprising C-type natriuretic peptide (CNP), its guanylate cyclase receptor Npr2, and cGMP-dependent protein kinase I (cGKI), is critical for the bifurcation of dorsal root ganglion (DRG) and cranial sensory ganglion axons when entering the mouse spinal cord and the hindbrain, respectively. However, the identity and functional relevance of phosphodiesterases (PDEs) that degrade cGMP in DRG neurons are not completely understood. Here we asked whether regulation of the intracellular cGMP concentration by PDEs modulates the branching of sensory axons...
October 14, 2016: European Journal of Neuroscience
Sharlene N Flesher, Jennifer L Collinger, Stephen T Foldes, Jeffrey M Weiss, John E Downey, Elizabeth C Tyler-Kabara, Sliman J Bensmaia, Andrew B Schwartz, Michael L Boninger, Robert A Gaunt
Intracortical microstimulation of the somatosensory cortex offers the potential for creating a sensory neuroprosthesis to restore tactile sensation. Whereas animal studies have suggested that both cutaneous and proprioceptive percepts can be evoked using this approach, the perceptual quality of the stimuli cannot be measured in these experiments. We show that microstimulation within the hand area of the somatosensory cortex of a person with long-term spinal cord injury evokes tactile sensations perceived as originating from locations on the hand and that cortical stimulation sites are organized according to expected somatotopic principles...
October 13, 2016: Science Translational Medicine
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