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Spinal pattern generator

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https://www.readbyqxmd.com/read/28096400/defining-recovery-neurobiology-of-injured-spinal-cord-by-synthetic-matrix-assisted-hmsc-implantation
#1
Alexander E Ropper, Devang K Thakor, InBo Han, Dou Yu, Xiang Zeng, Jamie E Anderson, Zaid Aljuboori, Soo-Woo Kim, Hongjun Wang, Richard L Sidman, Ross D Zafonte, Yang D Teng
Mesenchymal stromal stem cells (MSCs) isolated from adult tissues offer tangible potential for regenerative medicine, given their feasibility for autologous transplantation. MSC research shows encouraging results in experimental stroke, amyotrophic lateral sclerosis, and neurotrauma models. However, further translational progress has been hampered by poor MSC graft survival, jeopardizing cellular and molecular bases for neural repair in vivo. We have devised an adult human bone marrow MSC (hMSC) delivery formula by investigating molecular events involving hMSCs incorporated in a uniquely designed poly(lactic-co-glycolic) acid scaffold, a clinically safe polymer, following inflammatory exposures in a dorsal root ganglion organotypic coculture system...
January 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28062927/a-sensory-driven-controller-for-quadruped-locomotion
#2
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/28048532/su-f-t-396-impact-of-shoulder-deformation-for-head-and-neck-vmat
#3
Y Uchida, H Tachibana
PURPOSE: For head and neck VMAT (HN-VMAT), variations of position and deformation of patient's shoulders is a concern to affect inaccuracy of dose distribution. It has been reported that the setup error of the shoulders was variable from 5 mm - 1 cm. The beams of the HN-VMAT pass through the shoulders. We assessed the impact of shoulder deformation to dose distribution for HN-VMAT. METHODS: One HN-VMAT plan was generated using a patient's CT. The patient's CT was deformed using ImSimQA (Oncology Systems Limited, Shrewsbury, Shropshire, UK) to generate several patterns of the shoulders' deformations when the right and left humeral heads were shifted with 3, 6, and 15 mm in the superior and inferior directions (SI), 3, 5, and 15 mm in the anterior and posterior directions (AP), and 5 and 15 mm in the right or left direction (LR)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28031401/segmental-specificity-in-belly-dance-mimics-primal-trunk-locomotor-patterns
#4
Marilee Margaret Nugent, Theodore E Milner
Belly dance was used to investigate control of rhythmic undulating trunk movements in humans. Activation patterns in lumbar erector spinae muscles were recorded using surface electromyography at four segmental levels spanning T10 to L4. Muscle activation patterns for movement tempos of 2 Hz, 3 Hz and as fast as possible (up to 6 Hz) were compared to test the hypothesis that frequency modulates muscle timing, causing pattern changes analogous to gait transitions. Groups of trained and untrained female subjects were compared to test the hypothesis that experience modifies muscle coordination patterns and the capacity for selective motion of spinal segments...
December 28, 2016: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28025254/shaping-the-output-of-lumbar-flexor-motoneurons-by-sacral-neuronal-networks
#5
Meir Cherniak, Lili Anglister, Aharon Lev-Tov
: The ability to improve motor function in spinal cord injury patients by reactivating spinal central pattern generators (CPGs) requires the elucidation of neurons and pathways involved in activation and modulation of spinal networks in accessible experimental models. Previously we reported on adrenoceptor-dependent sacral control of lumbar-flexor motoneuron firing in newborn rats. The current work focuses on clarification of the circuitry and connectivity involved in this unique modulation and its potential use...
December 26, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28009049/zebrafish-adult-pigment-stem-cells-are-multipotent-and-form-pigment-cells-by-a-progressive-fate-restriction-process-clonal-analysis-identifies-shared-origin-of-all-pigment-cell-types
#6
Robert N Kelsh, Karen C Sosa, Jennifer P Owen, Christian A Yates
Skin pigment pattern formation is a paradigmatic example of pattern formation. In zebrafish, the adult body stripes are generated by coordinated rearrangement of three distinct pigment cell-types, black melanocytes, shiny iridophores and yellow xanthophores. A stem cell origin of melanocytes and iridophores has been proposed although the potency of those stem cells has remained unclear. Xanthophores, however, seemed to originate predominantly from proliferation of embryonic xanthophores. Now, data from Singh et al...
December 23, 2016: BioEssays: News and Reviews in Molecular, Cellular and Developmental Biology
https://www.readbyqxmd.com/read/27997694/spatial-patterning-of-excitatory-and-inhibitory-neuropil-territories-during-spinal-circuit-development
#7
Qing Yan, Lu Zhai, Bo Zhang, Julia E Dallman
To generate rhythmic motor behaviors, both single neurons and neural circuits require a balance between excitatory inputs that trigger action potentials and inhibitory inputs that promote a stable resting potential (E/I balance). Previous studies have focused on individual neurons and have shown that, over a short spatial scale, excitatory and inhibitory (E/I) synapses tend to form structured territories with inhibitory inputs enriched on cell bodies and proximal dendrites and excitatory inputs on distal dendrites...
December 20, 2016: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/27984181/ap-2%C3%AE-and-ap-2%C3%AE-regulate-dorsal-interneuron-specification-in-the-spinal-cord
#8
Xiaofeng Xu, Zijing Liu, Hao Huang, Kang Zheng, Xuemei Hu, Zunyi Zhang, Mengsheng Qiu
To date, five AP-2 genes that encode AP-2α, β, γ, δ and ε have been identified in vertebrates and they have been reported to be key regulators of embryonic development. However, the role of AP-2 family members in the development of central nervous system (CNS) has not been characterized. In the present study, we systematically examined the spatiotemporal expression pattern of AP-2 genes in the developing spinal cord of mouse and chick embryos and found that AP-2α and AP-2β are specifically expressed in post-mitotic dorsal interneurons...
October 28, 2016: Neuroscience
https://www.readbyqxmd.com/read/27981912/probing-the-human-spinal-locomotor-circuits-by-phasic-step-induced-feedback-and-by-tonic-electrical-and-pharmacological-neuromodulation
#9
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/27981910/multilevel-analysis-of-locomotion-in-immature-preparations-suggests-innovative-strategies-to-reactivate-stepping-after-spinal-cord-injury
#10
Michele R Brumley, Pierre A Guertin, Giuliano Taccola
Locomotion is one of the most complex motor behaviors. Locomotor patterns change during early life, reflecting development of numerous peripheral and hierarchically organized central structures. Among them, the spinal cord is of particular interest since it houses the central pattern generator (CPG) for locomotion. This main command center is capable of eliciting and coordinating complex series of rhythmic neural signals sent to motoneurons and to corresponding target-muscles for basic locomotor activity. For a long-time, the CPG has been considered a black box...
December 14, 2016: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/27937140/evaluation-of-whole-brain-resting-state-functional-connectivity-in-spinal-cord-injury-a-large-scale-network-analysis-using-network-based-statistic
#11
Mayank Kaushal, Akinwunmi Oni-Orisan, Gang Chen, Wenjun Li, Jack Leschke, B Douglas Ward, Benjamin T Kalinosky, Matthew D Budde, Brian D Schmit, Shi-Jiang Li, Vaishnavi Muqeet, Shekar N Kurpad
Large-scale network analysis characterizes the brain as a complex network of nodes and edges to evaluate functional connectivity patterns. The utility of graph-based techniques has been demonstrated in an increasing number of resting-state functional MRI (rs-fMRI) studies in the normal and diseased brain. However, to our knowledge, graph theory has not been used to study the reorganization pattern of resting-state brain networks in patients with traumatic complete spinal cord injury (SCI). In the present analysis, we applied a graph-theoretical approach to explore changes to global brain network architecture as a result of SCI...
December 9, 2016: Journal of Neurotrauma
https://www.readbyqxmd.com/read/27900462/effects-of-a-trpv1-agonist-capsaicin-on-respiratory-rhythm-generation-in-brainstem-spinal-cord-preparation-from-newborn-rats
#12
Mariho Tani, Sayumi Kotani, Chikara Hayakawa, Shih-Tien Lin, Saki Irie, Keiko Ikeda, Kiyoshi Kawakami, Hiroshi Onimaru
The heat-sensitive transient receptor potential vanilloid 1 (TRPV1) channels are expressed in the peripheral and central nervous systems. However, there is no report on how the activation of TRPV1 causes the modulation of neuronal activity in the medullary respiratory center. We examined effects of capsaicin, a specific agonist of TRPV1 channels, on respiratory rhythm generation in brainstem-spinal cord preparation from newborn rats. Capsaicin induced a biphasic response in the respiratory rhythm (a transient decrease followed by an increase in the C4 rate)...
November 29, 2016: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/27898852/horse-species-symposium-biomechanics-of-the-exercising-horse
#13
Hilary M Clayton
In spite of having large height and body mass, horses are cursorial animals with an extensive gait repertoire and considerable athletic abilities. The limbs have evolved so that the heavy musculature is confined to the proximal limbs while the distal limbs are light in weight with a single functional digit and long, lightweight tendons to move and support the distal joints. These adaptations reduce the moment of inertia and decrease the energy expended to protract and retract the limbs during locomotion. There is a division of labor between the forelimbs, which have a pillar-like construction specialized for weight bearing, and the hind limbs, in which the more angulated joints provide leverage for the generation of propulsion...
October 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/27870618/spinal-injections-for-pain-management
#14
William E Palmer
Image-guided spinal injection is commonly performed in symptomatic patients to decrease pain severity, confirm the pain generator, and delay or avoid surgery. This article focuses on the radiologist as spine interventionist and addresses the following four topics relevant to the radiologist who performs corticosteroid injections for pain management: (a) the rationale behind corticosteroid injection, (b) the interaction with patients, (c) the role of imaging in procedural selection and planning, and (d) the pearls and pitfalls of fluoroscopically guided injections...
December 2016: Radiology
https://www.readbyqxmd.com/read/27856309/hedgehog-signalling-acts-upstream-of-laminin-alpha1-transcription-in-the-zebrafish-paraxial-mesoderm
#15
Joseph Pickering, Vincent T Cunliffe, Freek Van Eeden, Anne-Gaëlle Borycki
Laminin-111 (α1β1γ1) is a member of the Laminin family of extra-cellular matrix proteins that comprises 16 members, components of basement membranes. Laminin-111, one of the first Laminin proteins synthesised during embryogenesis, is required for basement membrane deposition and has essential roles in tissue morphogenesis and patterning. Yet, the mechanisms controlling Laminin-111 expression are poorly understood. We generated a zebrafish transgenic reporter line that reproduces faithfully the expression pattern of lama1, the gene encoding Laminin α1, and we used this reporter line to investigate lama1 transcriptional regulation...
November 14, 2016: Matrix Biology: Journal of the International Society for Matrix Biology
https://www.readbyqxmd.com/read/27854215/characterization-of-new-transgenic-mouse-models-for-two-charcot-marie-tooth-causing-hspb1-mutations-using-the-rosa26-locus
#16
Delphine Bouhy, Thomas Geuens, Vicky De Winter, Leonardo Almeida-Souza, Istvan Katona, Joachim Weis, Tino Hochepied, Steven Goossens, Jody J Haigh, Sophie Janssens, Vincent Timmerman
BACKGROUND: Charcot-Marie-Tooth (CMT) and associated neuropathies, the most common inherited diseases of the peripheral nervous system, remain so far incurable. Three existing murine models of Charcot-Marie-Tooth type 2F (CMT2F) and/or distal hereditary motor neuropathy type IIb (dHMNIIb), caused by mutations in the small heat shock protein B1 gene (HSPB1/HSP27), partially recapitulate the hallmarks of peripheral neuropathy. Because these models overexpress the HSPB1 mutant proteins they differ from the patients' situation...
May 27, 2016: Journal of Neuromuscular Diseases
https://www.readbyqxmd.com/read/27830790/a-brain-spine-interface-alleviating-gait-deficits-after-spinal-cord-injury-in-primates
#17
Marco Capogrosso, Tomislav Milekovic, David Borton, Fabien Wagner, Eduardo Martin Moraud, Jean-Baptiste Mignardot, Nicolas Buse, Jerome Gandar, Quentin Barraud, David Xing, Elodie Rey, Simone Duis, Yang Jianzhong, Wai Kin D Ko, Qin Li, Peter Detemple, Tim Denison, Silvestro Micera, Erwan Bezard, Jocelyne Bloch, Grégoire Courtine
Spinal cord injury disrupts the communication between the brain and the spinal circuits that orchestrate movement. To bypass the lesion, brain-computer interfaces have directly linked cortical activity to electrical stimulation of muscles, and have thus restored grasping abilities after hand paralysis. Theoretically, this strategy could also restore control over leg muscle activity for walking. However, replicating the complex sequence of individual muscle activation patterns underlying natural and adaptive locomotor movements poses formidable conceptual and technological challenges...
10, 2016: Nature
https://www.readbyqxmd.com/read/27811303/developmental-changes-in-head-movement-kinematics-during-swimming-in-xenopus-laevis-tadpoles
#18
Sara Hänzi, Hans Straka
During the post-embryonic developmental growth of animals, a number of physiological parameters such as locomotor performance, dynamics and behavioural repertoire are adjusted to match the requirements determined by changes in body size, proportions and shape. Moreover, changes in movement parameters also cause changes in the dynamics of self-generated sensory stimuli, to which motion-detecting sensory systems have to adapt. Here, we examined head movements and swimming kinematics of Xenopus laevis tadpoles with a body length of 10-45 mm (developmental stage 46-54) and compared these parameters with fictive swimming, recorded as ventral root activity in semi-intact in vitro preparations...
January 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27805015/distinct-sets-of-locomotor-modules-control-the-speed-and-modes-of-human-locomotion
#19
Hikaru Yokoyama, Tetsuya Ogawa, Noritaka Kawashima, Masahiro Shinya, Kimitaka Nakazawa
Although recent vertebrate studies have revealed that different spinal networks are recruited in locomotor mode- and speed-dependent manners, it is unknown whether humans share similar neural mechanisms. Here, we tested whether speed- and mode-dependence in the recruitment of human locomotor networks exists or not by statistically extracting locomotor networks. From electromyographic activity during walking and running over a wide speed range, locomotor modules generating basic patterns of muscle activities were extracted using non-negative matrix factorization...
November 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27799905/cerebellar-and-spinal-direct-current-stimulation-in-children-computational-modeling-of-the-induced-electric-field
#20
Serena Fiocchi, Paolo Ravazzani, Alberto Priori, Marta Parazzini
Recent studies have shown that the specific application of transcranial direct current stimulation (tDCS) over the cerebellum can modulate cerebellar activity. In parallel, transcutaneous spinal DC stimulation (tsDCS) was found to be able to modulate conduction along the spinal cord and spinal cord functions. Of particular interest is the possible use of these techniques in pediatric age, since many pathologies and injuries, which affect the cerebellar cortex as well as spinal cord circuits, are diffuse in adults as well as in children...
2016: Frontiers in Human Neuroscience
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