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https://www.readbyqxmd.com/read/29035887/valeriana-officinalis-root-extract-modulates-cortical-excitatory-circuits-in-humans
#1
Ludovico Mineo, Carmen Concerto, Dhaval Patel, Tyrone Mayorga, Michael Paula, Eileen Chusid, Eugenio Aguglia, Fortunato Battaglia
BACKGROUND: Valeriana officinalis extract (VE) is a popular herbal medicine used for the treatment of anxiety and sleep disorders. Although the anxiolytic and sedative effects are mainly attributed to the modulation of GABA-ergic transmission, the mechanism of action has not been fully investigated in humans. Noninvasive brain stimulation protocols can be used to elucidate the mechanisms of action of psychoactive substances at the cortical level in humans. In this study, we investigated the effects of a single dose of VE on cortical excitability as assessed with transcranial magnetic stimulation (TMS)...
October 17, 2017: Neuropsychobiology
https://www.readbyqxmd.com/read/29035820/real-time-monitoring-of-amyloid-fibrillation-by-electrical-impedance-spectroscopy
#2
Rafael R da Silva, Sandro V de Lima, Helinando P de Oliveira, Celso P de Melo, Isaac A M Frías, Maria D L Oliveira, César A S Andrade
Electrical impedance spectroscopy (EIS) appears a promising label-free methodology for the investigation of processes related to the aggregation of macromolecules in solution. Here, we explore the EIS technique as a convenient tool for studying the irreversible aggregation of human insulin and describing its corresponding fibrillation kinetics. The in situ measurement of the electrical response of pure insulin solutions at 60°C allows for the real-time monitoring of the protein fibrillation as a function of the incubation time...
October 7, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29035219/an-embedded-real-time-processing-platform-for-optogenetic-neuroprosthetic-applications
#3
Boyuan Yan, Sheila Nirenberg
Optogenetics offers a powerful new approach for controlling neural circuits. It has numerous applications in both basic and clinical science. These applications require stimulating devices with small processors that can perform real-time neural signal processing, deliver high intensity light with high spatial and temporal resolution, and do not consume a lot of power. In this paper, we demonstrate the implementation of neuronal models in a platform consisting of an embedded system module and a portable DLP projector...
October 16, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/29034967/evaluation-of-a-method-for-isocapnic-hyperventilation-a-clinical-pilot-trial
#4
K Hallén, P Jildenstål, O Stenqvist, S-E Ricksten, S Lindgren
BACKGROUND: Isocapnic hyperventilation (IHV) is a method that shortens time to extubation after inhalation anaesthesia using hyperventilation (HV) without lowering airway CO2 . In a clinical trial on patients undergoing long-duration sevoflurane anaesthesia for major ear-nose-throat (ENT) surgery, we evaluated the utility of a technique for CO2 delivery (DCO2 ) to the inspiratory limb of a closed breathing circuit, during HV, to achieve isocapnia. METHODS: Fifteen adult ASA 1-3 patients were included...
October 16, 2017: Acta Anaesthesiologica Scandinavica
https://www.readbyqxmd.com/read/29034720/investigating-the-neuroanatomical-substrate-of-pathological-laughing-and-crying-in-amyotrophic-lateral-sclerosis-with-multimodal-neuroimaging-techniques
#5
Foteini Christidi, Efstratios Karavasilis, Panagiotis Ferentinos, Sophia Xirou, Georgios Velonakis, Michalis Rentzos, Vasiliki Zouvelou, Ioannis Zalonis, Efstathios Efstathopoulos, Nikolaos Kelekis, Ioannis Evdokimidis
OBJECTIVE: Pathological laughing and crying (PLC) is common in several neurological and psychiatric diseases and is associated with a distributed network involving the frontal cortex, the brainstem and cortico-pontine-cerebellar circuits. By applying multimodal neuroimaging approach, we examined the neuroanatomical substrate of PLC in a sample of patients with amyotrophic lateral sclerosis (ALS). METHODS: We studied 56 non-demented ALS patients and 25 healthy controls (HC)...
October 15, 2017: Amyotrophic Lateral Sclerosis and Frontotemporal Degeneration
https://www.readbyqxmd.com/read/29034615/effects-of-an-exercise-model-based-on-functional-circuits-in-an-older-population-with-different-levels-of-social-participation
#6
Walter Sepúlveda Loyola, Carlos Augusto Camillo, Carolina Valenzuela Torres, Vanessa Suziane Probst
AIM: To investigate whether being part of a community organization interfered with older adults' overall functionality. The magnitude of responses to a community exercise program based on functional circuits in socially active and socially non-active older adults was also investigated. METHODS: A total of 200 older adults aged ≥60 years from Requinoa, Chile, participated in the study. Participants were separated into two groups according to the level of social participation: socially active (SA) and socially non-active (SNA)...
October 15, 2017: Geriatrics & Gerontology International
https://www.readbyqxmd.com/read/29034487/the-role-of-spontaneous-neurotransmission-in-synapse-and-circuit-development
#7
REVIEW
Laura C Andreae, Juan Burrone
In the past, the spontaneous release of neurotransmitter from presynaptic terminals has been thought of as a side effect of evoked release, with little functional significance. As our understanding of the process of spontaneous release has increased over time, this notion has gradually changed. In this review, we focus on the importance of this form of release during neuronal development, a time of extreme levels of plasticity that includes the growth of dendrites and axons as well as the formation of new synaptic contacts...
October 16, 2017: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/29034483/effect-of-sensory-and-motor-connectivity-on-hand-function-in-pediatric-hemiplegia
#8
Disha Gupta, Alexandre Barachant, Andrew M Gordon, Claudio Ferre, Hsing-Ching Kuo, Jason B Carmel, Kathleen M Friel
OBJECTIVE: We tested the hypothesis that somatosensory system injury would more strongly affect movement than motor system injury in children with unilateral cerebral palsy (USCP). This hypothesis was based on how somatosensory and corticospinal circuits adapt to injury during development: while the motor system can maintain connections to the impaired hand from the uninjured hemisphere, this doesn't occur in the somatosensory system. As a corollary, cortical injury strongly impairs sensory function, so we hypothesized that cortical lesions would impair hand function more than subcortical lesions...
October 16, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/29034353/the-default-mode-network-in-autism
#9
Aarthi Padmanabhan, Charles J Lynch, Marie Schaer, Vinod Menon
Autism spectrum disorder (ASD) is characterized by deficits in social communication and interaction. Since its discovery as a major functional brain system, the default mode network (DMN) has been implicated in a number of psychiatric disorders, including ASD. Here we review converging multimodal evidence for DMN dysfunction in the context of specific components of social cognitive dysfunction in ASD: 'self-referential processing' - the ability to process social information relative to oneself and 'theory of mind' or 'mentalizing' - the ability to infer the mental states such as beliefs, intentions, and emotions of others...
September 2017: Biological Psychiatry: Cognitive Neuroscience and Neuroimaging
https://www.readbyqxmd.com/read/29034250/the-modification-and-performance-of-a-large-animal-anesthesia-machine-tafonius-%C3%A2-in-order-to-deliver-xenon-to-a-horse
#10
Bruna Santangelo, Astrid Robin, Keith Simpson, Julie Potier, Michel Guichardant, Karine Portier
INTRODUCTION: Xenon, due to its interesting anesthetic properties, could improve the quality of anesthesia protocols in horses despite its high price. This study aimed to modify and test an anesthesia machine capable of delivering xenon to a horse. MATERIALS AND METHODS: An equine anesthesia machine (Tafonius, Vetronic Services Ltd., UK) was modified by including a T-connector in the valve block to introduce xenon, so that the xenon was pushed into the machine cylinder by the expired gases...
2017: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/29034243/improving-surgical-outcome-using-diffusion-tensor-imaging-techniques-in-deep-brain-stimulation
#11
REVIEW
Angela An Qi See, Nicolas Kon Kam King
INTRODUCTION: Recent advances in surgical imaging include the use of diffusion tensor imaging (DTI) in deep brain stimulation (DBS) and provide a detailed view of the white matter tracts and their connections which are not seen with conventional magnetic resonance imaging. Given that the efficacy of DBS depends on the precise and accurate targeting of these circuits, better surgical planning using information obtained from DTI may lead to improved surgical outcome. We aim to review the available literature to evaluate the efficacy of such a strategy...
2017: Frontiers in Surgery
https://www.readbyqxmd.com/read/29033857/an-update-overview-on-brain-imaging-studies-of-internet-gaming-disorder
#12
REVIEW
Aviv M Weinstein
There are a growing number of studies on structural and functional brain mechanisms underlying Internet gaming disorder (IGD). Recent functional magnetic resonance imaging studies showed that IGD adolescents and adults had reduced gray matter volume in regions associated with attention motor coordination executive function and perception. Adolescents with IGD showed lower white matter (WM) integrity measures in several brain regions that are involved in decision-making, behavioral inhibition, and emotional regulation...
2017: Frontiers in Psychiatry
https://www.readbyqxmd.com/read/29033800/stimulation-of-cortico-subthalamic-projections-amplifies-resting-motor-circuit-activity-and-leads-to-increased-locomotion-in-dopamine-depleted-mice
#13
Teresa H Sanders
Deep brain stimulation (DBS) of the subthalamic nucleus (STN) improves motor function in patients with Parkinson's disease (PD). STN-DBS enables similar improved motor function, including increased movement speed (reduced bradykinesia), in the 6-OHDA dopamine-depletion mouse model of PD. Previous analyses of electrophysiological recordings from STN and motor cortex (M1) have explored signaling changes that correspond to PD and amelioration of PD symptoms. The most common results show an increase in beta frequency power during 'off' states and a reduction in beta during 'on' states...
2017: Frontiers in Integrative Neuroscience
https://www.readbyqxmd.com/read/29033799/a-critical-assessment-of-directed-connectivity-estimates-with-artificially-imposed-causality-in-the-supramammillary-septo-hippocampal-circuit
#14
Calvin K Young, Ming Ruan, Neil McNaughton
Algorithms for estimating directed connectivity have become indispensable to further understand the neurodynamics between functionally coupled brain areas. The evaluation of directed connectivity on the propagation of brain activity has largely been based on simulated data or toy models, where various hidden properties of neurophysiological data may not be fully recapitulated. In this study, directionality was unequivocally manipulated in the freely moving rat in a unique dataset, where normal oscillatory interactions between the supramammillary nucleus (SuM) and hippocampus (HPC) were attenuated by temporary medial septal (MS) inactivation, and replaced by electrical stimulation of the fornix to evaluate the performance of several directed connectivity assessment methods...
2017: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/29033796/laminar-and-cellular-distribution-of-monoamine-receptors-in-rat-medial-prefrontal-cortex
#15
REVIEW
Noemí Santana, Francesc Artigas
The prefrontal cortex (PFC) is deeply involved in higher brain functions, many of which are altered in psychiatric conditions. The PFC exerts a top-down control of most cortical and subcortical areas through descending pathways and is densely innervated by axons emerging from the brainstem monoamine cell groups, namely, the dorsal and median raphe nuclei (DR and MnR, respectively), the ventral tegmental area and the locus coeruleus (LC). In turn, the activity of these cell groups is tightly controlled by afferent pathways arising from layer V PFC pyramidal neurons...
2017: Frontiers in Neuroanatomy
https://www.readbyqxmd.com/read/29033795/cellular-mechanisms-of-cortisol-induced-changes-in-mauthner-cell-excitability-in-the-startle-circuit-of-goldfish
#16
Daniel R Bronson, Thomas Preuss
Predator pressure and olfactory cues (alarm substance) have been shown to modulate Mauthner cell (M-cell) initiated startle escape responses (C-starts) in teleost fish. The regulation of such adaptive responses to potential threats is thought to involve the release of steroid hormones such as cortisol. However, the mechanism by which cortisol may regulate M-cell excitability is not known. Here, we used intrasomatic, in vivo recordings to elucidate the acute effects of cortisol on M-cell membrane properties and sound evoked post-synaptic potentials (PSPs)...
2017: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/29033788/zinc-as-a-neuromodulator-in-the-central-nervous-system-with-a-focus-on-the-olfactory-bulb
#17
REVIEW
Laura J Blakemore, Paul Q Trombley
The olfactory bulb (OB) is central to the sense of smell, as it is the site of the first synaptic relay involved in the processing of odor information. Odor sensations are first transduced by olfactory sensory neurons (OSNs) before being transmitted, by way of the OB, to higher olfactory centers that mediate olfactory discrimination and perception. Zinc is a common trace element, and it is highly concentrated in the synaptic vesicles of subsets of glutamatergic neurons in some brain regions including the hippocampus and OB...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/29033737/a-very-rare-unusual-site-of-ventilator-breathing-circuit-leakage-beware
#18
Akshaya Narayan Shetti
No abstract text is available yet for this article.
October 2017: Saudi Journal of Anaesthesia
https://www.readbyqxmd.com/read/29033474/operation-of-a-140-ghz-gyro-amplifier-using-a-dielectric-loaded-sever-less-confocal-waveguide
#19
Alexander V Soane, Michael A Shapiro, Sudheer Jawla, Richard J Temkin
The design and experimental results of a 140 GHz gyro-amplifier that uses a dielectric-loaded, sever-less confocal waveguide are presented. The gyro-traveling wave amplifier uses the HE06 mode of a confocal geometry with power coupled in and out of the structure with Vlasov-type, quasi-optical couplers. Dielectric loading attached to the side of the confocal structure suppresses unwanted modes allowing zero-drive stable operation at 48 kV and 3A of beam current. The confocal gyro-amplifier demonstrated a peak circuit gain of 35 dB, a bandwidth of 1...
October 2017: IEEE Transactions on Plasma Science
https://www.readbyqxmd.com/read/29033131/oxysterol-restraint-of-cholesterol-synthesis-prevents-aim2-inflammasome-activation
#20
Eric V Dang, Jeffrey G McDonald, David W Russell, Jason G Cyster
Type I interferon restrains interleukin-1β (IL-1β)-driven inflammation in macrophages by upregulating cholesterol-25-hydroxylase (Ch25h) and repressing SREBP transcription factors. However, the molecular links between lipid metabolism and IL-1β production remain obscure. Here, we demonstrate that production of 25-hydroxycholesterol (25-HC) by macrophages is required to prevent inflammasome activation by the DNA sensor protein absent in melanoma 2 (AIM2). We find that in response to bacterial infection or lipopolysaccharide (LPS) stimulation, macrophages upregulate Ch25h to maintain repression of SREBP2 activation and cholesterol synthesis...
October 7, 2017: Cell
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