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Neuro plasticity

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https://www.readbyqxmd.com/read/28646336/nogo-a-antibodies-enhance-axonal-repair-and-remyelination-in-neuro-inflammatory-and-demyelinating-pathology
#1
Benjamin V Ineichen, Sandra Kapitza, Christiane Bleul, Nicolas Good, Patricia S Plattner, Maryam S Seyedsadr, Julia Kaiser, Marc P Schneider, Björn Zörner, Roland Martin, Michael Linnebank, Martin E Schwab
Two hallmarks of chronic multiple sclerosis lesions are the absence of significant spontaneous remyelination and primary as well as secondary neurodegeneration. Both characteristics may be influenced by the presence of inhibitory factors preventing myelin and neuronal repair. We investigated the potential of antibodies against Nogo-A, a well-known inhibitory protein for neuronal growth and plasticity, to enhance neuronal regeneration and remyelination in two animal models of multiple sclerosis. We induced a targeted experimental autoimmune encephalomyelitis (EAE) lesion in the dorsal funiculus of the cervical spinal cord of adult rats resulting in a large drop of skilled forelimb motor functions...
June 23, 2017: Acta Neuropathologica
https://www.readbyqxmd.com/read/28637489/synaptoimmunology-roles-in-health-and-disease
#2
REVIEW
Robert Nisticò, Eric Salter, Celine Nicolas, Marco Feligioni, Dalila Mango, Zuner A Bortolotto, Pierre Gressens, Graham L Collingridge, Stephane Peineau
Mounting evidence suggests that the nervous and immune systems are intricately linked. Many proteins first identified in the immune system have since been detected at synapses, playing different roles in normal and pathological situations. In addition, novel immunological functions are emerging for proteins typically expressed at synapses. Under normal conditions, release of inflammatory mediators generally represents an adaptive and regulated response of the brain to immune signals. On the other hand, when immune challenge becomes prolonged and/or uncontrolled, the consequent inflammatory response leads to maladaptive synaptic plasticity and brain disorders...
June 20, 2017: Molecular Brain
https://www.readbyqxmd.com/read/28623429/bdnf-a-key-factor-with-multipotent-impact-on-brain-signaling-and-synaptic-plasticity
#3
REVIEW
Przemysław Kowiański, Grażyna Lietzau, Ewelina Czuba, Monika Waśkow, Aleksandra Steliga, Janusz Moryś
Brain-derived neurotrophic factor (BDNF) is one of the most widely distributed and extensively studied neurotrophins in the mammalian brain. Among its prominent functions, one can mention control of neuronal and glial development, neuroprotection, and modulation of both short- and long-lasting synaptic interactions, which are critical for cognition and memory. A wide spectrum of processes are controlled by BDNF, and the sometimes contradictory effects of its action can be explained based on its specific pattern of synthesis, comprising several intermediate biologically active isoforms that bind to different types of receptor, triggering several signaling pathways...
June 16, 2017: Cellular and Molecular Neurobiology
https://www.readbyqxmd.com/read/28612953/eye-movements-sensori-motor-adaptation-and-cerebellar-dependent-learning-in-autism-towards-potential-biomarkers-and-sub-phenotypes
#4
Edward G Freedman, John J Foxe
Because of the wide range of symptoms expressed in individuals with Autism Spectrum Disorder (ASD) and their idiosyncratic severity it is unlikely that a single remedial approach will be universally effective. Resolution of this dilemma requires identifying subgroups within the autism spectrum, based on symptom set and severity, on an underlying neuro-structural difference, and on specific behavioral dysfunction. This will provide critical insight into the disorder and may lead to better diagnoses, and more targeted remediation in these subphenotypes of people with ASD...
June 14, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28608763/identifying-clinical-risk-in-low-grade-gliomas-and-appropriate-treatment-strategies-with-special-emphasis-on-the-role-of-surgery
#5
Sébastien Boissonneau, Hugues Duffau
Diffuse low-grade glioma (DLGG) is a chronic tumoral disease that ineluctably grows, migrates along white matter pathways, and progresses to a higher grade of malignancy. Areas covered: To determine the best individualized treatment attitude for each DLGG patient, and to redefine it over the years, i.e. to optimize the "onco-functional balance" of serial and multimodal therapies, the understanding of the natural history of this chronic disease is crucial but not sufficient. A paradigmatic shift is to tailor the individual management according to the dynamic relationships between DLGG course and neural remodeling...
June 13, 2017: Expert Review of Anticancer Therapy
https://www.readbyqxmd.com/read/28596106/mechanisms-of-axon-regeneration-the-significance-of-proteoglycans
#6
Kazuma Sakamoto, Kenji Kadomatsu
BACKGROUND: Therapeutics specific to neural injury have long been anticipated but remain unavailable. Axons in the central nervous system do not readily regenerate after injury, leading to dysfunction of the nervous system. This failure of regeneration is due to both the low intrinsic capacity of axons for regeneration and the various inhibitors emerging upon injury. After many years of concerted efforts, however, these hurdles to axon regeneration have been partially overcome. SCOPE OF REVIEW: This review summarizes the mechanisms regulating axon regeneration...
June 5, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28580666/connexins-and-pannexins-at-the-junction-of-neuro-glial-homeostasis-disease
#7
REVIEW
Andrew S Lapato, Seema K Tiwari-Woodruff
In the central nervous system (CNS), connexin (Cx)s and pannexin (Panx)s are an integral component of homeostatic neuronal excitability and synaptic plasticity. Neuronal Cx gap junctions form electrical synapses across biochemically similar GABAergic networks, allowing rapid and extensive inhibition in response to principle neuron excitation. Glial Cx gap junctions link astrocytes and oligodendrocytes in the pan-glial network that is responsible for removing excitotoxic ions and metabolites. In addition, glial gap junctions help constrain excessive excitatory activity in neurons and facilitate astrocyte Ca(2+) slow wave propagation...
June 5, 2017: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/28530340/-can-post-traumatic-stress-disorder-be-prevented-with-glucocorticoids
#8
REVIEW
Hagit Cohen, Zeev Kaplan, Joseph Zohar
Glucocorticoids (GCs) play a major role in orchestrating the complex physiological and behavioral reactions essential for the maintenance of homeostasis. These compounds enable the organism to prepare for, respond to and cope with the acute demands of physical and emotional stressors. The appropriate GC release, commensurate with stressor severity, enables the body to properly contain stress responses so as to promote recovery by rapidly restoring homeostasis. Indeed, inadequate GC release following stress not only delays recovery by disrupting biological homeostasis in the short run but can also interfere with the processing or interpretation of stressful information that results in long-term disruptions in memory integration...
December 2016: Harefuah
https://www.readbyqxmd.com/read/28525197/-treatment-resistant-depression-actuality-and-perspectives-in-2017
#9
REVIEW
N Lucas, P Hubain, G Loas, F Jurysta
Major depressive disorder (MDD) affects 3 to 17 % of adults. 15 to 30 % of patients with MDD suffer from treatment resistant depression (TRD). No international consensus defines TRD. The most common definition is " MDD that is not enough improved after two successive and different classes of antidepressant treatments in appropriate dose and duration ". The appropriate dose corresponds to maximal dose accepted by scientific reports and clinical recommendations, while the appropriate duration is around 6 weeks...
2017: Revue Médicale de Bruxelles
https://www.readbyqxmd.com/read/28520739/timing-dependent-ltp-and-ltd-in-mouse-primary-visual-cortex-following-different-visual-deprivation-models
#10
Yatu Guo, Wei Zhang, Xia Chen, Junhong Fu, Wenbo Cheng, Desheng Song, Xiaolei Qu, Zhuo Yang, Kanxing Zhao
Visual deprivation during the critical period induces long-lasting changes in cortical circuitry by adaptively modifying neuro-transmission and synaptic connectivity at synapses. Spike timing-dependent plasticity (STDP) is considered a strong candidate for experience-dependent changes. However, the visual deprivation forms that affect timing-dependent long-term potentiation(LTP) and long-term depression(LTD) remain unclear. Here, we demonstrated the temporal window changes of tLTP and tLTD, elicited by coincidental pre- and post-synaptic firing, following different modes of 6-day visual deprivation...
2017: PloS One
https://www.readbyqxmd.com/read/28511127/neurophysiology-of-synaptic-functioning-in-multiple-sclerosis
#11
REVIEW
Mario Stampanoni Bassi, Francesco Mori, Fabio Buttari, Girolama A Marfia, Andrea Sancesario, Diego Centonze, Ennio Iezzi
Multiple sclerosis (MS) is an inflammatory immune-mediate disorder of the central nervous system (CNS), primarily affecting the myelin sheath and followed by neurodegeneration. Synaptic alterations are emerging as critical determinants of early neurodegeneration in MS. Inflammation-induced alterations of synaptic transmission and plasticity have been investigated in vitro and also in human MS using transcranial magnetic stimulation (TMS) techniques. Specific inflammatory cytokines alter glutamatergic and GABAergic transmission, resulting in synaptic hyperexcitability...
July 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28236848/the-fibrinolytic-system-a-new-target-for-treatment-of-depression-with-psychedelics
#12
R D Idell, G Florova, A A Komissarov, S Shetty, R B S Girard, S Idell
Current understanding of the neurobiology of depression has grown over the past few years beyond the traditional monoamine theory of depression to include chronic stress, inflammation and disrupted synaptic plasticity. Tissue plasminogen activator (tPA) is a key factor that not only promotes fibrinolysis via the activation of plasminogen, but also contributes to regulation of synaptic plasticity and neurogenesis through plasmin-mediated activation of a probrain derived neurotrophic factor (BDNF) to mature BDNF...
March 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28228335/alterations-in-cardiac-autonomic-control-in-spinal-cord-injury
#13
REVIEW
Fin Biering-Sørensen, Tor Biering-Sørensen, Nan Liu, Lasse Malmqvist, Jill Maria Wecht, Andrei Krassioukov
A spinal cord injury (SCI) interferes with the autonomic nervous system (ANS). The effect on the cardiovascular system will depend on the extent of damage to the spinal/central component of ANS. The cardiac changes are caused by loss of supraspinal sympathetic control and relatively increased parasympathetic cardiac control. Decreases in sympathetic activity result in heart rate and the arterial blood pressure changes, and may cause arrhythmias, in particular bradycardia, with the risk of cardiac arrest in those with cervical or high thoracic injuries...
February 15, 2017: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/28216088/sex-differences-in-the-neuro-immune-consequences-of-stress-focus-on-depression-and-anxiety
#14
REVIEW
Mandakh Bekhbat, Gretchen N Neigh
Women appear to be more vulnerable to the depressogenic effects of inflammation than men. Chronic stress, one of the most pertinent risk factors of depression and anxiety, is known to induce behavioral and affective-like deficits via neuroimmune alterations including activation of the brain's immune cells, pro-inflammatory cytokine expression, and subsequent changes in neurotransmission and synaptic plasticity within stress-related neural circuitry. Despite well-established sexual dimorphisms in the stress response, immunity, and prevalence of stress-linked psychiatric illnesses, much of current research investigating the neuroimmune impact of stress remains exclusively focused on male subjects...
February 16, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28212927/patients-with-chronic-dizziness-following-traumatic-head-injury-typically-have-multiple-diagnoses-involving-combined-peripheral-and-central-vestibular-dysfunction
#15
Q Arshad, R E Roberts, H Ahmad, R Lobo, M Patel, T Ham, D J Sharp, B M Seemungal
OBJECTIVE: We hypothesised that chronic vestibular symptoms (CVS) of imbalance and dizziness post-traumatic head injury (THI) may relate to: (i) the occurrence of multiple simultaneous vestibular diagnoses including both peripheral and central vestibular dysfunction in individual patients increasing the chance of missed diagnoses and suboptimal treatment; (ii) an impaired response to vestibular rehabilitation since the central mechanisms that mediate rehabilitation related brain plasticity may themselves be disrupted...
April 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/28197403/network-plasticity-and-intraoperative-mapping-for-personalized-multimodal-management-of-diffuse-low-grade-gliomas
#16
REVIEW
Cristina Diana Ghinda, Hugues Duffau
Gliomas are the most frequent primary brain tumors and include a variety of different histological tumor types and malignancy grades. Recent achievements in terms of molecular and imaging fields have created an unprecedented opportunity to perform a comprehensive interdisciplinary assessment of the glioma pathophysiology, with direct implications in terms of the medical and surgical treatment strategies available for patients. The current paradigm shift considers glioma management in a comprehensive perspective that takes into account the intricate connectivity of the cerebral networks...
2017: Frontiers in Surgery
https://www.readbyqxmd.com/read/28181878/using-inspiration-from-synaptic-plasticity-rules-to-optimize-traffic-flow-in-distributed-engineered-networks
#17
Jonathan Y Suen, Saket Navlakha
Controlling the flow and routing of data is a fundamental problem in many distributed networks, including transportation systems, integrated circuits, and the Internet. In the brain, synaptic plasticity rules have been discovered that regulate network activity in response to environmental inputs, which enable circuits to be stable yet flexible. Here, we develop a new neuro-inspired model for network flow control that depends only on modifying edge weights in an activity-dependent manner. We show how two fundamental plasticity rules, long-term potentiation and long-term depression, can be cast as a distributed gradient descent algorithm for regulating traffic flow in engineered networks...
May 2017: Neural Computation
https://www.readbyqxmd.com/read/28147268/autonomous-camkii-activity-as-a-drug-target-for-histological-and-functional-neuroprotection-after-resuscitation-from-cardiac-arrest
#18
Guiying Deng, James E Orfila, Robert M Dietz, Myriam Moreno-Garcia, Krista M Rodgers, Steve J Coultrap, Nidia Quillinan, Richard J Traystman, K Ulrich Bayer, Paco S Herson
The Ca(2+)/calmodulin-dependent protein kinase II (CaMKII) is a major mediator of physiological glutamate signaling, but its role in pathological glutamate signaling (excitotoxicity) remains less clear, with indications for both neuro-toxic and neuro-protective functions. Here, the role of CaMKII in ischemic injury is assessed utilizing our mouse model of cardiac arrest and cardiopulmonary resuscitation (CA/CPR). CaMKII inhibition (with tatCN21 or tatCN19o) at clinically relevant time points (30 min after resuscitation) greatly reduces neuronal injury...
January 31, 2017: Cell Reports
https://www.readbyqxmd.com/read/28137969/cerebellar-m1-connectivity-changes-associated-with-motor-learning-are-somatotopic-specific
#19
Danny A Spampinato, Hannah J Block, Pablo A Celnik
One of the functions of the cerebellum in motor learning is to predict and account for systematic changes to the body or environment. This form of adaptive learning is mediated by plastic changes occurring within the cerebellar cortex. The strength of cerebellar-to-cerebral pathways for a given muscle may reflect aspects of cerebellum-dependent motor adaptation. These connections with motor cortex (M1) can be estimated as cerebellar inhibition (CBI): a conditioning pulse of transcranial magnetic stimulation delivered to the cerebellum before a test pulse over motor cortex...
March 1, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28130175/up-regulation-of-sirt6-in-the-hippocampus-induced-rats-with-depression-like-behavior-via-the-block-akt-gsk3%C3%AE-signaling-pathway
#20
Qiang Mao, Xue Gong, Chanjuan Zhou, Zhe Tu, Libo Zhao, Ling Wang, Xinfa Wang, Lu Sun, Jinjun Xia, Bin Lian, Jianjun Chen, Jun Mu, Deyu Yang, Peng Xie
Major depression is the leading cause of disability worldwide, which is associated with diverse alterations in brain such as neuro-inflammation, synaptic dysfunction, and cognitive deficit. Accumulating evidences suggest sirtuins (SIRTs) are involved in brain developmental disorders, metabolic diseases and play a key role in cognition and synaptic plasticity, yet the role in mood regulation remains controversial. Hence, Western blotting and RT-qPCR were used to investigate whether SIRTs (SIRT1-7) expression levels were altered in the hippocampus of rats, which followed 5 weeks of chronic unpredictable mild stress (CUMS) treatment, the results showed depressive-like behaviors: like body weight, forced swim test and sucrose preference test and SIRT6 was a significant increase in the hippocampal of CUMS rats...
April 14, 2017: Behavioural Brain Research
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