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https://www.readbyqxmd.com/read/28720882/cell-type-specific-differences-in-promoter-activity-of-the-als-linked-c9orf72-mouse-ortholog
#1
Abraham J Langseth, Juhyun Kim, Janet E Ugolino, Yajas Shah, Ho-Yon Hwang, Jiou Wang, Dwight E Bergles, Solange P Brown
A hexanucleotide repeat expansion in the C9orf72 gene is the most common cause of inherited forms of the neurodegenerative disease amyotrophic lateral sclerosis (ALS). Both loss-of-function and gain-of-function mechanisms have been proposed to underlie this disease, but the pathogenic pathways are not fully understood. To better understand the involvement of different cell types in the pathogenesis of ALS, we systematically analyzed the distribution of promoter activity of the mouse ortholog of C9orf72 in the central nervous system...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28713861/behavioural-clusters-and-predictors-of-performance-during-recovery-from-stroke
#2
L E Ramsey, J S Siegel, C E Lang, M Strube, G L Shulman, M Corbetta
We examined the patterns and variability of recovery post-stroke in multiple behavioral domains. A large cohort of first time stroke patients with heterogeneous lesions was studied prospectively and longitudinally at 1-2 weeks, 3 months and one year post-injury with structural MRI to measure lesion anatomy and in-depth neuropsychological assessment. Impairment was described at all timepoints by a few clusters of correlated deficits. The time course and magnitude of recovery was similar across domains, with change scores largely proportional to the initial deficit and most recovery occurring within the first three months...
2017: Nature Human Behaviour
https://www.readbyqxmd.com/read/28710748/longitudinal-changes-in-white-matter-fractional-anisotropy-in-adult-onset-niemann-pick-disease-type-c-patients-treated-with-miglustat
#3
Elizabeth A Bowman, Dennis Velakoulis, Patricia Desmond, Mark Walterfang
Niemann-Pick disease type C (NPC) is a rare neurometabolic disorder resulting in impaired intracellular lipid trafficking. The only disease-modifying treatment currently available is miglustat, an iminosugar that inhibits the accumulation of lipid metabolites in neurons and other cells. This longitudinal diffusion tensor imaging (DTI) study examined how the rate of white matter change differed between treated and non-treated adult-onset NPC patient groups. Nine adult-onset NPC patients (seven undergoing treatment with miglustat, two not treated) underwent DTI neuroimaging...
July 15, 2017: JIMD Reports
https://www.readbyqxmd.com/read/28706475/focal-stroke-in-the-developing-rat-motor-cortex-induces-age-and-experience-dependent-maladaptive-plasticity-of-corticospinal-system
#4
Mariangela Gennaro, Alessandro Mattiello, Raffaele Mazziotti, Camilla Antonelli, Lisa Gherardini, Andrea Guzzetta, Nicoletta Berardi, Giovanni Cioni, Tommaso Pizzorusso
Motor system development is characterized by an activity-dependent competition between ipsilateral and contralateral corticospinal tracts (CST). Clinical evidence suggests that age is crucial for developmental stroke outcome, with early lesions inducing a "maladaptive" strengthening of ipsilateral projections from the healthy hemisphere and worse motor impairment. Here, we investigated in developing rats the relation between lesion timing, motor outcome and CST remodeling pattern. We induced a focal ischemia into forelimb motor cortex (fM1) at two distinct pre-weaning ages: P14 and P21...
2017: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/28705167/inhibition-of-parkinsonian-tremor-with-cutaneous-afferent-evoked-by-transcutaneous-electrical-nerve-stimulation
#5
Man-Zhao Hao, Shao-Qin Xu, Zi-Xiang Hu, Fu-Liang Xu, Chuan-Xin M Niu, Qin Xiao, Ning Lan
BACKGROUND: Recent study suggests that tremor signals are transmitted by way of multi-synaptic corticospinal pathway. Neurophysiological studies have also demonstrated that cutaneous afferents exert potent inhibition to descending motor commands by way of spinal interneurons. We hypothesize in this study that cutaneous afferents could also affect the transmission of tremor signals, thus, inhibit tremor in patients with PD. METHODS: We tested this hypothesis by activating cutaneous afferents in the dorsal hand skin innervated by superficial radial nerve using transcutaneous electrical nerve stimulation (TENS)...
July 14, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28704733/reversal-of-long-term-potentiation-like-plasticity-in-primary-motor-cortex-in-patients-with-progressive-supranuclear-palsy
#6
Matteo Bologna, Kelly Bertram, Giulia Paparella, Claudia Papi, Daniele Belvisi, Antonella Conte, Antonio Suppa, David R Williams, Alfredo Berardelli
OBJECTIVE: Abnormal primary motor cortex plasticity might be involved in the pathophysiology of progressive supranuclear palsy. In the present study we aimed to investigate possible abnormalities of depotentiation, a mechanism involved in plasticity regulation, in this condition. METHODS: Primary motor cortex excitability, investigated with single and paired-pulse transcranial magnetic stimulation, as well as long-term potentiation-like plasticity and its reversibility, were studied using theta burst stimulation in 15 patients with progressive supranuclear palsy and 11 healthy controls...
June 27, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28701544/modulation-of-corticospinal-input-to-the-legs-by-arm-and-leg-cycling-in-people-with-incomplete-spinal-cord-injury
#7
Rui Zhou, Laura Alvarado, Seoyoung Kim, Su Ling Chong, Vivian K Mushahwar
The spinal cervico-lumbar interaction during rhythmic movements in humans has recently been studied; however, the role of arm movements in modulating the corticospinal drive to the legs is not well understood. The goals of this study were to investigate the effect of active rhythmic arm movements on the corticospinal drive to the legs (study 1); and assess the effect of simultaneous arm and leg training on the corticospinal pathway after incomplete spinal cord injury (iSCI) (study 2). In study 1, neurologically intact (NI) participants or participants with iSCI performed combinations of stationary and rhythmic cycling of the arms and legs, while motor evoked potentials (MEPs) were recorded from the vastus lateralis (VL) muscle...
July 12, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28701541/afferent-input-and-sensory-function-after-human-spinal-cord-injury
#8
Recep Ali Ozdemir, Monica A Perez
Spinal cord injury (SCI) often disrupts the integrity of afferent (sensory) axons projecting through the spinal cord dorsal columns to the brain. Examinations of ascending sensory tracts, therefore, are critical for monitoring the extent of SCI and recovery processes. In this review, we discuss the most common electrophysiological techniques used to assess transmission of afferent inputs to the primary motor cortex (i.e., afferent-input induced facilitation and inhibition) and the somatosensory cortex (i.e...
July 12, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28699187/does-transcranial-electrical-stimulation-enhance-corticospinal-excitability-of-the-motor-cortex-in-healthy-individuals-a-systematic-review-and-meta-analysis
#9
Thusharika Dissanayaka, Maryam Zoghi, Michael Farrell, Gary F Egan, Shapour Jaberzadeh
Numerous studies have explored the effects of transcranial electrical stimulation (tES) - including anodal transcranial direct current stimulation (a-tDCS), cathodal transcranial direct current stimulation (c-tDCS), transcranial alternative current stimulation (tACS), transcranial random noise stimulation (tRNS) and transcranial pulsed current stimulation (tPCS) - on corticospinal excitability (CSE) in healthy populations. However, the efficacy of these techniques and their optimal parameters for producing robust results have not been studied...
July 12, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28692630/effects-of-four-weeks-of-strength-training-on-the-corticomotoneuronal-pathway
#10
James L Nuzzo, Benjamin K Barry, Matthew D Jones, Simon C Gandevia, Janet L Taylor
PURPOSE: Neural adaptations to strength training have long been recognized, but knowledge of mechanisms remains incomplete. Using novel techniques and a design which limited experimental bias, this study examined if 4 weeks of strength training alters voluntary activation and corticospinal transmission. METHODS: Twenty-one subjects were randomized into strength training (n = 10; 7 females, 3 males; 23.5 ± 7.5 yr; mean ± SD) and control groups (n = 11; 2 females, 9 males; 23...
July 7, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28691645/a-single-bout-of-high-intensity-interval-training-improves-motor-skill-retention-in-individuals-with-stroke
#11
Jean-Francois Nepveu, Alexander Thiel, Ada Tang, Joyce Fung, Jesper Lundbye-Jensen, Lara A Boyd, Marc Roig
BACKGROUND: One bout of high-intensity cardiovascular exercise performed immediately after practicing a motor skill promotes changes in the neuroplasticity of the motor cortex and facilitates motor learning in nondisabled individuals. OBJECTIVE: To determine if a bout of exercise performed at high intensity is sufficient to induce neuroplastic changes and improve motor skill retention in patients with chronic stroke. METHODS: Twenty-two patients with different levels of motor impairment were recruited...
July 1, 2017: Neurorehabilitation and Neural Repair
https://www.readbyqxmd.com/read/28691588/the-relation-between-the-motor-evoked-potential-and-diffusion-tensor-tractography-for-the-corticospinal-tract-in-chronic-hemiparetic-patients-with-cerebral-infarct
#12
Sung Ho Jang, Dea Hee Kim, Seong Ho Kim, Jeong Pyo Seo
We examined the relation between the results of transcranial magnetic stimulation (TMS) and diffusion tensor tractography (DTT) for the corticospinal tract (CST) in chronic hemiparetic patients with a middle cerebral artery (MCA) territory infarct. The amplitude of motor evoked potential (MEP) was closely related to the FN of the CST on DTT in chronic hemiparetic patients with an MCA infarct. We believe that our results would be helpful in more precise estimation of the CST.
July 9, 2017: Somatosensory & Motor Research
https://www.readbyqxmd.com/read/28691140/preclinical-and-clinical-evidence-on-ipsilateral-corticospinal-projections-implication-for-motor-recovery
#13
REVIEW
Ali Alawieh, Stephen Tomlinson, DeAnna Adkins, Steve Kautz, Wuwei Feng
Motor impairment is the most common complication after stroke, and recovery of motor function has been shown to be dependent on the extent of lesion in the ipsilesional corticospinal tract (iCST) and activity within ipsilesional primary and secondary motor cortices. However, work from neuroimaging research has suggested a role of the contralesional hemisphere in promoting recovery after stroke potentially through the ipsilateral uncrossed CST fibers descending to ipsilateral spinal segments. These ipsilateral fibers, sometimes referred to as "latent" projections, are thought to contribute to motor recovery independent of the crossed CST...
July 9, 2017: Translational Stroke Research
https://www.readbyqxmd.com/read/28690440/locate-the-lesion-a-project-based-learning-case-that-stimulates-comprehension-and-application-of-neuroanatomy
#14
Michele L Lemons
A fictitious patient, Mr. Challenge, is admitted to the emergency room and displays symptoms consistent with damage to the central nervous system. In this problem-based learning case, students are challenged to determine the location of a lesion that is consistent with Mr. Challenge's symptoms. Students discover details about Mr. Challenge's symptoms while exploring three anatomical pathways: corticospinal tract, spinothalamic tract and medial lemniscal pathway. Students make predictions as to which of these pathways may be damaged in Mr...
2017: Journal of Undergraduate Neuroscience Education: JUNE: a Publication of FUN, Faculty for Undergraduate Neuroscience
https://www.readbyqxmd.com/read/28689758/white-matter-microstructure-predicts-cognitive-training-induced-improvements-in-attention-and-executive-functioning-in-schizophrenia
#15
Karuna Subramaniam, Jeevit Gill, Melissa Fisher, Pratik Mukherjee, Srikantan Nagarajan, Sophia Vinogradov
We examined the relationship between white matter microstructure in schizophrenia using diffusion tensor imaging (DTI) and cognitive improvements induced by 70h (~16weeks) of cognitive training. We measured anatomical connectivity in 48 patients with schizophrenia (SZ) and 28 healthy control participants (HC) at baseline, and then examined the relationship between anatomical connectivity at baseline and training-induced cognitive gains in 30 SZ who performed diffusion imaging after completing 70h of training...
July 6, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28686124/influence-of-an-intratumoral-cyst-on-drug-distribution-by-convection-enhanced-delivery-case-report
#16
Iryna Ivasyk, Peter F Morgenstern, Eva Wembacher-Schroeder, Mark M Souweidane
Convection-enhanced delivery (CED) uses positive pressure to induce convective flow of molecules and maximize drug distribution. Concerns have been raised about the effect of cystic structures on uniform drug distribution with CED. The authors describe the case of a patient with a diffuse intrinsic pontine glioma (DIPG) with a large cyst and examine its effect on drug distribution after CED with a radiolabeled antibody. The patient was treated according to protocol with CED of (124)I-8H9 to the pons for nonprogressive DIPG after radiation therapy as part of a Phase I trial (clinical trial registration no...
July 7, 2017: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/28686121/surgical-and-molecular-considerations-in-the-treatment-of-pediatric-thalamopeduncular-tumors
#17
Ryan P Lee, Kimberly A Foster, Jock C Lillard, Paul Klimo, David W Ellison, Brent Orr, Frederick A Boop
OBJECTIVE Thalamopeduncular tumors are a group of pediatric low-grade gliomas that arise at the interface of the thalamus and brainstem peduncle. They typically occur within the first 2 decades of life, presenting with progressive spastic hemiparesis. Treatment strategies, including surgical intervention, have varied significantly. The authors present their experience in the treatment of 13 children, ages 2-15 years, with non-neurofibromatosis-related pilocytic astrocytomas located in the thalamopeduncular region...
July 7, 2017: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/28685893/alterations-in-white-matter-microstructure-are-associated-with-goal-directed-upper-limb-movement-segmentation-in-children-born-extremely-preterm
#18
Niklas Lenfeldt, Anna-Maria Johansson, Erik Domellöf, Katrine Riklund, Louise Rönnqvist
Altered white matter microstructure is commonly found in children born preterm (PT), especially those born at an extremely low gestational age (GA). These children also commonly show disturbed motor function. This study explores the relation between white matter alterations and upper-limb movement segmentation in 41 children born PT (19 girls), and 41 children born at term (18 girls) at 8 years. The PT group was subdivided into extremely PT (E-PT; GA = 25-27 weeks, N = 10), very PT (V-PT; GA = 28-32 weeks, N = 13), and moderately PT (M-PT; GA = 33-35 weeks, N = 18)...
July 7, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28677154/brain-changes-following-four-weeks-of-unimanual-motor-training-evidence-from-fmri-guided-diffusion-mri-tractography
#19
Lee B Reid, Martin V Sale, Ross Cunnington, Jason B Mattingley, Stephen E Rose
We have reported reliable changes in behavior, brain structure, and function in 24 healthy right-handed adults who practiced a finger-thumb opposition sequence task with their left hand for 10 min daily, over 4 weeks. Here, we extend these findings by using diffusion MRI to investigate white-matter changes in the corticospinal tract, basal-ganglia, and connections of the dorsolateral prefrontal cortex. Twenty-three participant datasets were available with pre-training and post-training scans. Task performance improved in all participants (mean: 52...
July 5, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28673659/joseph-jumenti%C3%A3-1879-1928-a-forgotten-neurologist
#20
REVIEW
O Walusinski
Joseph Jumentié (1879-1928), through his clinical skill and expertise in anatomical pathology, enhanced the prestige of the master neurologists he studied under- Jules Dejerine, Augusta Dejerine-Klumpke and Joseph Babiński -and their fame overshadowed the crucial support that Jumentié provided them. Following a remarkable doctoral thesis in 1911, which defined the semiology of tumors in the cerebellopontine angle, Jumentié conducted research into various areas of neurology and authored numerous publications...
June 30, 2017: Revue Neurologique
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