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https://www.readbyqxmd.com/read/29667473/harnessing-neuroplasticity-modern-approaches-and-clinical-future
#1
Andrew Octavian Sasmita, Joshua Kuruvilla, Anna Pick Kiong Ling
Neurological diseases and injuries to the nervous system may cause inadvertent damage to neuronal and synaptic structures. Such phenomenon would catastrophically accumulate, leading to the development of neurological and neurodegenerative disorders which might affect memory, cognition, and motoric functions. The body has various negative feedback systems which are able to induce beneficial neuroplastic changes in mediating some neuronal damage, however, such efforts are often not enough to ameliorate the derogatory changes...
April 18, 2018: International Journal of Neuroscience
https://www.readbyqxmd.com/read/29666910/ontogeny-and-development-of-the-tritocerebral-commissure-giant-tcg-an-identified-neuron-in-the-brain-of-the-grasshopper-schistocerca-gregaria
#2
George Stephen Boyan, Leslie Williams, Tobias Müller, Jonathan P Bacon
The tritocerebral commissure giant (TCG) of the grasshopper Schistocerca gregaria is one of the best anatomically and physiologically described arthropod brain neurons. A member of the so-called Ventral Giant cluster of cells, it integrates sensory information from visual, antennal and hair receptors, and synapses with thoracic motor neurons in order to initiate and regulate flight behavior. Its ontogeny, however, remains unclear. In this study, we use bromodeoxyuridine incorporation and cyclin labeling to reveal proliferative neuroblasts in the region of the embryonic brain where the ventral giant cluster is located...
April 17, 2018: Development Genes and Evolution
https://www.readbyqxmd.com/read/29666508/intrinsic-mechanisms-of-neuronal-axon-regeneration
#3
REVIEW
Marcus Mahar, Valeria Cavalli
Permanent disabilities following CNS injuries result from the failure of injured axons to regenerate and rebuild functional connections with their original targets. By contrast, injury to peripheral nerves is followed by robust regeneration, which can lead to recovery of sensory and motor functions. This regenerative response requires the induction of widespread transcriptional and epigenetic changes in injured neurons. Considerable progress has been made in recent years in understanding how peripheral axon injury elicits these widespread changes through the coordinated actions of transcription factors, epigenetic modifiers and, to a lesser extent, microRNAs...
April 17, 2018: Nature Reviews. Neuroscience
https://www.readbyqxmd.com/read/29666277/disparate-binding-kinetics-by-an-intrinsically-disordered-domain-enables-temporal-regulation-of-transcriptional-complex-formation
#4
Neil O Robertson, Ngaio C Smith, Athina Manakas, Mahiar Mahjoub, Gordon McDonald, Ann H Kwan, Jacqueline M Matthews
Intrinsically disordered regions are highly represented among mammalian transcription factors, where they often contribute to the formation of multiprotein complexes that regulate gene expression. An example of this occurs with LIM-homeodomain (LIM-HD) proteins in the developing spinal cord. The LIM-HD protein LHX3 and the LIM-HD cofactor LDB1 form a binary complex that gives rise to interneurons, whereas in adjacent cell populations, LHX3 and LDB1 form a rearranged ternary complex with the LIM-HD protein ISL1, resulting in motor neurons...
April 16, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29666246/large-sod1-aggregates-unlike-trimeric-sod1-do-not-impact-cell-viability-in-a-model-of-amyotrophic-lateral-sclerosis
#5
Cheng Zhu, Matthew V Beck, Jack D Griffith, Mohanish Deshmukh, Nikolay V Dokholyan
Aberrant accumulation of misfolded Cu, Zn superoxide dismutase (SOD1) is a hallmark of SOD1-associated amyotrophic lateral sclerosis (ALS), an invariably fatal neurodegenerative disease. While recent discovery of nonnative trimeric SOD1-associated neurotoxicity has suggested a potential pathway for motor neuron impairment, it is yet unknown whether large, insoluble aggregates are cytotoxic. Here we designed SOD1 mutations that specifically stabilize either the fibrillar form or the trimeric state of SOD1. The designed mutants display elevated populations of fibrils or trimers correspondingly, as demonstrated by gel filtration chromatography and electron microscopy...
April 16, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29666144/sporadic-amyotrophic-lateral-sclerosis-sals-skeletal-muscle-response-to-cerebrospinal-fluid-from-sals-patients-in-a-rat-model
#6
Shruthi Shanmukha, Gayathri Narayanappa, Atchayaram Nalini, Phalguni Anand Alladi, Trichur R Raju
Skeletal muscle atrophy is the most prominent feature of amyotrophic lateral sclerosis (ALS), an adult-onset neurodegenerative disease of motor neurons. However, the contribution of skeletal muscle to disease progression remains elusive. Our previous studies have shown that intrathecal injection of cerebrospinal fluid from sporadic ALS patients (ALS-CSF) induces several degenerative changes in motor neurons and glia of neonatal rats. Here, we describe various pathologic events in the rat extensor digitorum longus muscle following intrathecal injection of ALS-CSF...
April 16, 2018: Disease Models & Mechanisms
https://www.readbyqxmd.com/read/29665540/information-theoretic-decomposition-of-embodied-and-situated-systems
#7
Federico Da Rold
The embodied and situated view of cognition stresses the importance of real-time and nonlinear bodily interaction with the environment for developing concepts and structuring knowledge. In this article, populations of robots controlled by an artificial neural network learn a wall-following task through artificial evolution. At the end of the evolutionary process, time series are recorded from perceptual and motor neurons of selected robots. Information-theoretic measures are estimated on pairings of variables to unveil nonlinear interactions that structure the agent-environment system...
March 27, 2018: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/29665503/zebrafish-extracellular-matrix-improves-neuronal-viability-and-network-formation-in-a-3-dimensional-culture
#8
Sung-Min Kim, Daniel Ward Long, Michael Wai Kok Tsang, Yadong Wang
Mammalian central nervous system (CNS) has limited capacity for regeneration. CNS injuries cause life-long debilitation and lead to $50 billion in healthcare costs in U.S. alone each year. Despite numerous efforts in the last few decades, CNS-related injuries remain as detrimental as they were 50 years ago. Some functional recovery can occur, but most regeneration are limited by an extracellular matrix (ECM) that actively inhibits axonal repair and promotes glial scarring. In most tissues, the ECM is an architectural foundation that plays an active role in supporting cellular development and regenerative response after injury...
April 6, 2018: Biomaterials
https://www.readbyqxmd.com/read/29663708/the-postmigratory-alar-topography-of-visceral-cranial-nerve-efferents-challenges-the-classical-model-of-hindbrain-columns
#9
Luis Puelles, Petr Tvrdik, Margaret Martínez-de-la-Torre
The classic columnar model of cranial nerve central representation assumes that all motor and sensory hindbrain neurons develop within four radial migration domains, held to be separated by a sulcal alar-basal boundary (sulcus limitans). This essay reviews a number of developmental data that challenge these concepts. These results are interpreted within the framework of present day neuromeric conception of the brainstem (the prosomeric model). Advances in dorsoventral patterning of the spinal cord and hindbrain now show that there exist up to eight alar microzones and five basal microzones (molecularly and histogenetically distinct longitudinal progenitor domains)...
April 16, 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29663553/rapid-evidence-assessment-of-approaches-to-community-neurological-nursing-care-for-people-with-neurological-conditions-post-discharge-from-acute-care-hospital
#10
REVIEW
Judith Dianne Pugh, Kathleen McCoy, Anne M Williams, Brenda Bentley, Leanne Monterosso
Neurological conditions represent leading causes of non-fatal burden of disease that will consume a large proportion of projected healthcare expenditure. Inconsistent access to integrated healthcare and other services for people with long-term neurological conditions stresses acute care services. The purpose of this rapid evidence assessment, conducted February-June 2016, was to review the evidence supporting community neurological nursing approaches for patients with neurological conditions post-discharge from acute care hospitals...
April 16, 2018: Health & Social Care in the Community
https://www.readbyqxmd.com/read/29663410/the-negotiated-equilibrium-model-of-spinal-cord-function
#11
Jonathan R Wolpaw
The belief that the spinal cord is hardwired is no longer tenable. Like the rest of the CNS, the spinal cord changes during growth and aging, when new motor behaviours are acquired, and in response to trauma and disease. This paper describes a new model of spinal cord function that reconciles its recently appreciated plasticity with its long recognized reliability as the final common pathway for behaviour. According to this model, the substrate of each motor behaviour comprises brain and spinal plasticity: the plasticity in the brain induces and maintains the plasticity in the spinal cord...
April 16, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29659809/a-new-mouse-model-of-arx-dup24-recapitulates-the-patients-behavioural-and-fine-motor-alterations
#12
Aline Dubos, Hamid Meziane, Giovanni Iacono, Aurore Curie, Fabrice Riet, Christelle Martin, Nadège Loaëc, Marie-Christine Birling, Mohammed Selloum, Elisabeth Normand, Guillaume Pavlovic, Tania Sorg, Henk G Stunnenberg, Jamel Chelly, Yann Humeau, Gaëlle Friocourt, Yann Hérault
The Aristaless-related homeobox (ARX) transcription factor is involved in the development of GABAergic and cholinergic neurons in the forebrain. ARX mutations have been associated with a wide spectrum of neurodevelopmental disorders in humans, among which the most frequent, a 24bp duplication in the polyalanine tract 2 (c.428_451dup24), gives rise to intellectual disability, fine motor defects with or without epilepsy. To understand the functional consequences of this mutation, we generated a partially humanized mouse model carrying the c...
April 5, 2018: Human Molecular Genetics
https://www.readbyqxmd.com/read/29659159/spinal-accessory-motor-neurons-in-the-mouse-a-special-type-of-branchial-motor-neuron
#13
Charles Watson, Petr Tvrdik
The spinal accessory nerve arises from motor neurons in the upper cervical spinal cord. The axons of these motor neurons exit dorsal to the ligamentum denticulatum and form the spinal accessory nerve. The nerve ascends in the spinal subarachnoid space to enter the posterior cranial fossa through the foramen magnum. The spinal accessory nerve then turns caudally to exit through the jugular foramen alongside the vagus and glossopharyngeal nerves, and then travels to supply the sternomastoid and trapezius muscles in the neck...
April 16, 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29657118/functional-maps-of-mechanosensory-features-in-the-drosophila-brain
#14
Paola Patella, Rachel I Wilson
Johnston's organ is the largest mechanosensory organ in Drosophila. It contributes to hearing, touch, vestibular sensing, proprioception, and wind sensing. In this study, we used in vivo 2-photon calcium imaging and unsupervised image segmentation to map the tuning properties of Johnston's organ neurons (JONs) at the site where their axons enter the brain. We then applied the same methodology to study two key brain regions that process signals from JONs: the antennal mechanosensory and motor center (AMMC) and the wedge, which is downstream of the AMMC...
April 9, 2018: Current Biology: CB
https://www.readbyqxmd.com/read/29656927/pontocerebellar-hypoplasia-type-1-for-the-neuropediatrician-genotype-phenotype-correlations-and-diagnostic-guidelines-based-on-new-cases-and-overview-of-the-literature
#15
I Ivanov, D Atkinson, I Litvinenko, L Angelova, S Andonova, H Mumdjiev, I Pacheva, M Panova, R Yordanova, V Belovejdov, A Petrova, M Bosheva, T Shmilev, A Savov, A Jordanova
Pontocerebellar hypoplasia type 1 (PCH1) is a major cause of non-5q spinal muscular atrophy (SMA). We screened 128 SMN1-negative SMA patients from Bulgaria for a frequent mutation -p.G31A in EXOSC3, and performed a literature review of all genetically verified PCH1 cases. Homozygous p.G31A/EXOSC3 mutation was identified in 14 Roma patients, representing three fourths of all our SMN1-negative Roma SMA cases. The phenotype of the p.G31A/EXOSC3 homozygotes was compared to the clinical presentation of all reported to date genetically verified PCH1 cases...
April 3, 2018: European Journal of Paediatric Neurology: EJPN
https://www.readbyqxmd.com/read/29656591/amp-activated-protein-kinase-dependent-induction-of-autophagy-by-erythropoietin-protects-against-spinal-cord-injury-in-rats
#16
Peng Wang, Zhong-Dong Xie, Chang-Nan Xie, Chao-Wei Lin, Ji-Li Wang, Li-Na Xuan, Chun-Wu Zhang, Yu Wang, Zhi-Hui Huang, Hong-Lin Teng
AIMS: Autophagy has been regarded as a promising therapeutic target for spinal cord injury (SCI). Erythropoietin (EPO) has been demonstrated to exhibit neuroprotective effects in the central nervous system (CNS); however, the molecular mechanisms of its protection against SCI remain unknown. This study aims to investigate whether the neuroprotective effects of EPO on SCI are mediated by autophagy via AMP-activated protein kinase (AMPK) signaling pathways. METHODS: Functional assessment and Nissl staining were used to investigate the effects of EPO on SCI...
April 15, 2018: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/29656576/repurposing-carbamazepine-for-the-treatment-of-amyotrophic-lateral-sclerosis-in-sod1-g93a-mouse-model
#17
Jing-Jing Zhang, Qin-Ming Zhou, Sheng Chen, Wei-Dong Le
AIMS: To investigate the effect and mechanisms of carbamazepine (CBZ) on the onset and progression of amyotrophic lateral sclerosis (ALS) in SOD1-G93A mouse model. METHODS: Starting from 64 days of age, SOD1-G93A mice were orally administered with CBZ at 200 mg/kg once daily until death. The disease onset and life span of SOD1-G93A mice were recorded. Motor neurons (MNs) in anterior horn of spinal cord were quantified by Nissl staining and SMI-32 immunostaining...
April 14, 2018: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/29656478/transplantation-of-neural-progenitor-cells-expressing-glial-cell-line-derived-neurotrophic-factor-into-the-motor-cortex-as-a-strategy-to-treat-amyotrophic-lateral-sclerosis
#18
Gretchen M Thomsen, Pablo Avalos, Annie A Ma, Mor Alkaslasi, Noell Cho, Livia Wyss, Jean-Philippe Vit, Marlesa Godoy, Patrick Suezaki, Oksana Shelest, Krystof S Bankiewicz, Clive N Svendsen
Early dysfunction of cortical motor neurons may underlie the initiation of amyotrophic lateral sclerosis (ALS). As such, the cortex represents a critical area of ALS research and a promising therapeutic target. In the current study, human cortical-derived neural progenitor cells engineered to secrete glial cell line-derived neurotrophic factor (GDNF) were transplanted into the SOD1G93A ALS rat cortex, where they migrated, matured into astrocytes, and released GDNF. This protected motor neurons, delayed disease pathology and extended survival of the animals...
April 15, 2018: Stem Cells
https://www.readbyqxmd.com/read/29656429/citalopram-attenuated-neurobehavioral-biochemical-and-metabolic-alterations-in-transient-middle-cerebral-artery-occlusion-model-of-stroke-in-male-wistar-rats
#19
Sangeetha Gupta, Deepti Upadhayay, Uma Sharma, Naranamangalam R Jagannathan, Yogendra Kumar Gupta
Oxidative stress and inflammation are implicated as cardinal mechanisms of neuronal death following stroke. In the present study citalopram (Cit) was investigated in a 2 h middle cerebral artery occlusion (MCAo) model of stroke in male Wistar rats. Pretreatment, posttreatment (Post Cit) and pre plus posttreatment (Pre + Post Cit) with Cit were evaluated for its neuroprotective effect. In pretreatment protocol, effect of Cit at three doses (2, 4, and 8 mg/kg) administered i.p., 1 h prior to MCAo was evaluated using neurological deficit score (NDS), motor deficit paradigms, and cerebral infarction 24 h post-MCAo...
April 15, 2018: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/29656427/exercise-training-abrogates-age-dependent-loss-of-hypothalamic-oxytocinergic-circuitry-and-maintains-high-parasympathetic-activity
#20
Carla R Santos, Adriana Ruggeri, Alexandre Ceroni, Lisete C Michelini
Neuroanatomical studies associating neuronal tract tracing and immunohistochemistry identified reciprocal (ascending noradrenergic/descending oxytocinergic, OTergic) connections between brainstem cardiovascular nuclei and the paraventricular hypothalamic nucleus (PVN). Previous functional studies indicated that exercise training (T) augmented the expression/activity of OTergic pathway and improve the autonomic control of the heart. Knowing that ageing is associated with autonomic dysfunction and sinoaortic denervation blocked T-induced beneficial effects, we hypothesized that T was able to reduce age-dependent impairment by improving the afferent signaling to PVN and augmenting OTergic modulation of cardiovascular control...
April 14, 2018: Journal of Neuroendocrinology
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