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https://www.readbyqxmd.com/read/29352627/indications-and-limits-of-stereoelectroencephalography-seeg
#1
REVIEW
Lorella Minotti, Alexandra Montavont, Julia Scholly, Louise Tyvaert, Delphine Taussig
Epilepsy surgery is now an accepted treatment to achieve seizure control in carefully selected patients, both children and adults, suffering from drug-resistant focal epilepsy. Although surgical strategies can often be defined on the basis of non-invasive diagnostic procedures, and despite the recent advances in this field, an increasing number of more complex cases requires invasive EEG (iEEG) to provide precise information on the localization of the epileptogenic zone (EZ), its relationships with eloquent cortex (EC), and the feasibility of a tailored surgical resection...
January 15, 2018: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/29352524/effects-of-physical-activity-and-sedentary-behavior-on-brain-response-to-high-calorie-food-cues-in-young-adults
#2
Shan Luo, Sydney G O'Connor, Britni R Belcher, Kathleen A Page
OBJECTIVE: Physical activity (PA) promotes weight maintenance, potentially because of its beneficial effects on feeding behavior regulation via diminished food cue reactivity within brain reward regions. This study examined how levels of PA and sedentary behavior (SB) relate to brain responses to food cues. METHODS: Participants (22 lean, 18 with obesity) completed three to five PA recalls over 2 months. Average minutes per day of moderate to vigorous PA (MVPA) and SB were calculated...
January 19, 2018: Obesity
https://www.readbyqxmd.com/read/29352317/optic-flow-detection-is-not-influenced-by-visual-vestibular-congruency
#3
Vivian Holten, Paul R MacNeilage
Optic flow patterns generated by self-motion relative to the stationary environment result in congruent visual-vestibular self-motion signals. Incongruent signals can arise due to object motion, vestibular dysfunction, or artificial stimulation, which are less common. Hence, we are predominantly exposed to congruent rather than incongruent visual-vestibular stimulation. If the brain takes advantage of this probabilistic association, we expect observers to be more sensitive to visual optic flow that is congruent with ongoing vestibular stimulation...
2018: PloS One
https://www.readbyqxmd.com/read/29352268/cylindromatosis-mediates-neuronal-cell-death-in-vitro-and-in-vivo
#4
Goutham K Ganjam, Nicole Angela Terpolilli, Sebastian Diemert, Ina Eisenbach, Lena Hoffmann, Christina Reuther, Christiane Herden, Joachim Roth, Nikolaus Plesnila, Carsten Culmsee
The tumor-suppressor cylindromatosis (CYLD) is a deubiquitinating enzyme and key regulator of cell proliferation and inflammation. A genome-wide siRNA screen linked CYLD to receptor interacting protein-1 (RIP1) kinase-mediated necroptosis; however, the exact mechanisms of CYLD-mediated cell death remain unknown. Therefore, we investigated the precise role of CYLD in models of neuronal cell death in vitro and evaluated whether CYLD deletion affects brain injury in vivo. In vitro, downregulation of CYLD increased RIP1 ubiquitination, prevented RIP1/RIP3 complex formation, and protected neuronal cells from oxidative death...
January 19, 2018: Cell Death and Differentiation
https://www.readbyqxmd.com/read/29352211/hdl-nanoparticles-targeting-sonic-hedgehog-subtype-medulloblastoma
#5
Jonathan B Bell, Jonathan S Rink, Frank Eckerdt, Jessica Clymer, Stewart Goldman, C Shad Thaxton, Leonidas C Platanias
Medulloblastoma is the most common paediatric malignant brain cancer and there is a need for new targeted therapeutic approaches to more effectively treat these malignant tumours, which can be divided into four molecular subtypes. Here, we focus on targeting sonic hedgehog (SHH) subtype medulloblastoma, which accounts for approximately 25% of all cases. The SHH subtype relies upon cholesterol signalling for tumour growth and maintenance of tumour-initiating cancer stem cells (CSCs). To target cholesterol signalling, we employed biomimetic high-density lipoprotein nanoparticles (HDL NPs) which bind to the HDL receptor, scavenger receptor type B-1 (SCARB1), depriving cells of natural HDL and their cholesterol cargo...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352201/cross-species-transcriptional-analysis-reveals-conserved-and-host-specific-neoplastic-processes-in-mammalian-glioma
#6
Nina P Connolly, Amol C Shetty, Jesse A Stokum, Ina Hoeschele, Marni B Siegel, C Ryan Miller, Anthony J Kim, Cheng-Ying Ho, Eduardo Davila, J Marc Simard, Scott E Devine, John H Rossmeisl, Eric C Holland, Jeffrey A Winkles, Graeme F Woodworth
Glioma is a unique neoplastic disease that develops exclusively in the central nervous system (CNS) and rarely metastasizes to other tissues. This feature strongly implicates the tumor-host CNS microenvironment in gliomagenesis and tumor progression. We investigated the differences and similarities in glioma biology as conveyed by transcriptomic patterns across four mammalian hosts: rats, mice, dogs, and humans. Given the inherent intra-tumoral molecular heterogeneity of human glioma, we focused this study on tumors with upregulation of the platelet-derived growth factor signaling axis, a common and early alteration in human gliomagenesis...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29351906/edc-impact-molecular-effects-of-developmental-fm-550-exposure-in-wistar-rat-placenta-and-fetal-forebrain
#7
Kylie R Baldwin, Brian Horman, Allison L Phillips, Susan L McRitchie, Scott Watson, Jocelin Deese-Spruill, Dereje Jima, Susan Sumner, Heather Stapleton, Heather Patisaul
Firemaster 550 (FM 550) is a flame retardant (FR) mixture that has become one of the most commonly used FRs in foam-based furniture and baby products. Human exposure to this commercial mixture, comprised of brominated and organophosphate components, is widespread. We have repeatedly shown that developmental exposure can lead to sex-specific behavioral effects in rats. Accruing evidence of endocrine disruption and potential neurotoxicity have raised concerns regarding the neurodevelopmental effects of FM 550 exposure, but the specific mechanisms of action remains unclear...
January 19, 2018: Endocrine Connections
https://www.readbyqxmd.com/read/29351671/a-novel-non-invasive-method-for-evaluating-electroencephalograms-on-laying-hens
#8
Krista N Eberle, Michael P Martin, Sanjay Shah, Ramon D Malheiros, Kimberly A Livingston, Kenneth E Anderson
The use of electroencephalograms (EEG) to study the avian brain relative to behavior was conducted as early as the 1960's. EEG readings, combined with visual cues, provide the ability to elucidate and correlate behaviors to neurological and physiological changes in a chicken. The use of EEG recordings in animal models require access to the brain to implant electrodes. Having the ability to observe EEG activity on sensible birds without surgical implantation could broaden the research in this area and give further insight related to the hen's state of awareness...
January 17, 2018: Poultry Science
https://www.readbyqxmd.com/read/29351662/the-versatile-tanycyte-a-hypothalamic-integrator-of-reproduction-and-energy-metabolism
#9
Vincent Prevot, Bénédicte Dehouck, Ariane Sharif, Philippe Ciofi, Paolo Giacobini, Jerome Clasadonte
The fertility and survival of an individual rely on the ability of the periphery to promptly, effectively and reproducibly communicate with brain neural networks that control reproduction, food intake and energy homeostasis. Tanycytes, a specialized glial cell type lining the wall of the third ventricle in the median eminence of the hypothalamus, appear to act as the linchpin of these processes by dynamically controlling the secretion of neuropeptides into the portal vasculature by hypothalamic neurons and regulating blood-brain and blood-cerebrospinal fluid exchanges, both processes that depend on the ability of these cells to adapt their morphology to the physiological state of the individual...
January 17, 2018: Endocrine Reviews
https://www.readbyqxmd.com/read/29351614/a-membrane-g-protein-coupled-estrogen-receptor-is-necessary-but-not-sufficient-for-sex-differences-in-zebra-finch-auditory-coding
#10
Amanda A Krentzel, Matheus Macedo-Lima, Maaya Z Ikeda, Luke Remage-Healey
Estradiol acts as a neuromodulator in brain regions important for cognition and sensory processing. Estradiol also shapes brain sex differences, but rarely have these concepts been considered simultaneously. In male and female songbirds, estradiol rapidly increases within the auditory forebrain during song exposure and enhances local auditory processing. We tested whether GPER1, a membrane bound estrogen receptor, is necessary and sufficient for neuroestrogen regulation of forebrain auditory processing in male and female zebra finches (Taeniopygia guttata)...
January 17, 2018: Endocrinology
https://www.readbyqxmd.com/read/29351339/brain-functional-bold-perturbation-modelling-for-forward-fmri-and-inverse-mapping
#11
Zikuan Chen, Jennifer Robinson, Vince Calhoun
PURPOSE: To computationally separate dynamic brain functional BOLD responses from static background in a brain functional activity for forward fMRI signal analysis and inverse mapping. METHODS: A brain functional activity is represented in terms of magnetic source by a perturbation model: χ = χ0 +δχ, with δχ for BOLD magnetic perturbations and χ0 for background. A brain fMRI experiment produces a timeseries of complex-valued images (T2* images), whereby we extract the BOLD phase signals (denoted by δP) by a complex division...
2018: PloS One
https://www.readbyqxmd.com/read/29351276/static-length-changes-of-cochlear-outer-hair-cells-can-tune-low-frequency-hearing
#12
Nikola Ciganović, Rebecca L Warren, Batu Keçeli, Stefan Jacob, Anders Fridberger, Tobias Reichenbach
The cochlea not only transduces sound-induced vibration into neural spikes, it also amplifies weak sound to boost its detection. Actuators of this active process are sensory outer hair cells in the organ of Corti, whereas the inner hair cells transduce the resulting motion into electric signals that propagate via the auditory nerve to the brain. However, how the outer hair cells modulate the stimulus to the inner hair cells remains unclear. Here, we combine theoretical modeling and experimental measurements near the cochlear apex to study the way in which length changes of the outer hair cells deform the organ of Corti...
January 19, 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29350998/overexpression-of-the-neuronal-human-pro-renin-receptor-mediates-angiotensin-ii-independent-blood-pressure-regulation-in-the-central-nervous-system
#13
Hua Peng, Dane D Jensen, Wencheng Li, Michelle N Sullivan, Sophie A Buller, Caleb J Worker, Silvana G Cooper, Shiqi Zheng, Scott Earley, Curt D Sigmund, Yumei Feng
Despite advances in anti-hypertensive therapeutics, at least 15-20% of hypertensive patients have resistant hypertension through mechanisms that remain poorly understood. In this study, we provide a new mechanism for regulation of blood pressure (BP) in the central nervous system (CNS) by the (pro)renin receptor (PRR), a recently identified component of the renin-angiotensin system (RAS) that mediates angiotensin II (Ang II) formation in the CNS. Although the PRR also mediates Ang II-independent signaling, the importance of these pathways in BP regulation is unknown...
December 15, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29350679/proangiogenic-functions-of-an-rgd-slay-containing-osteopontin-icosamer-peptide-in-huvecs-and-in-the-postischemic-brain
#14
Hahnbie Lee, Yin-Chuan Jin, Seung-Woo Kim, Il-Doo Kim, Hye-Kyung Lee, Ja-Kyeong Lee
Osteopontin (OPN) is a phosphorylated glycoprotein secreted into body fluids by various cell types. OPN contains arginine-glycine-aspartate (RGD) and serine-leucine-alanine-tyrosine (SLAY) motifs that bind to several integrins and mediate a wide range of cellular processes. In the present study, the proangiogenic effects of a 20-amino-acid OPN peptide (OPNpt20) containing RGD and SLAY motifs were examined in human umbilical vein endothelial cells (HUVECs) and in a rat focal cerebral ischemia model. OPNpt20 exerted robust proangiogenic effects in HUVECs by promoting proliferation, migration and tube formation...
January 19, 2018: Experimental & Molecular Medicine
https://www.readbyqxmd.com/read/29350608/acute-transverse-myelitis-following-scrub-typhus-a-case-report-and-review-of-the-literature
#15
Hyun-Seung Ryu, Bong Ju Moon, Jae-Young Park, Sang-Deok Kim, Seung-Kwon Seo, Jung-Kil Lee
Context Scrub typhus is an acute febrile disease caused by Orientia tsutsugamushi. The disease can usually involve the lungs, heart, liver, spleen and brain through hematogenous dissemination. However, very rarely, acute transverse myelitis in the spinal cord develops from scrub typhus. We present a case of acute transverse myelitis following scrub typhus with a review of the literature. Findings A 66-year-old male visited a hospital for general myalgia, mild headache, and fever in October. He was noted to have thick, black papule skin on his abdomen, which was highly suggestive of scrub typhus...
January 19, 2018: Journal of Spinal Cord Medicine
https://www.readbyqxmd.com/read/29350595/motor-network-recovery-in-patients-with-chronic-spinal-cord-compression-a-longitudinal-study-following-decompression-surgery
#16
Kayla Ryan, Sandy Goncalves, Robert Bartha, Neil Duggal
OBJECTIVE The authors used functional MRI to assess cortical reorganization of the motor network after chronic spinal cord compression and to characterize the plasticity that occurs following surgical intervention. METHODS A 3-T MRI scanner was used to acquire functional images of the brain in 22 patients with reversible cervical spinal cord compression and 10 control subjects. Controls performed a finger-tapping task on 3 different occasions (baseline, 6-week follow-up, and 6-month follow-up), whereas patients performed the identical task before surgery and again 6 weeks and 6 months after spinal decompression surgery...
January 19, 2018: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/29350434/the-cystine-glutamate-exchanger-xct-slc7a11-is-expressed-in-significant-concentrations-in-a-subpopulation-of-astrocytes-in-the-mouse-brain
#17
Sigrid Ottestad-Hansen, Qiu Xiang Hu, Virgine Veronique Follin-Arbelet, Eduard Bentea, Hideyo Sato, Ann Massie, Yun Zhou, Niels Christian Danbolt
The cystine-glutamate exchanger (xCT) promotes glutathione synthesis by catalyzing cystine uptake and glutamate release. The released glutamate may modulate normal neural signaling and contribute to excitotoxicity in pathological situations. Uncertainty, however, remains as neither the expression levels nor the distribution of xCT have been unambiguously determined. In fact, xCT has been reported in astrocytes, neurons, oligodendrocytes and microglia, but most of the information derives from cell cultures. Here, we show by immunohistochemistry and by Western blotting that xCT is widely expressed in the central nervous system of both sexes...
January 19, 2018: Glia
https://www.readbyqxmd.com/read/29350251/pyramidal-cell-selective-glun1-knockout-causes-impairments-in-salience-attribution-and-related-eeg-activity
#18
Alexandra D Forrest, Jakyung Bang, Robert E Featherstone, Jonathan H Bloom, Matthew S Luminais, Rebecca V Zhang, Christopher R Gajewski, Mary F McMullen, Yuling Liang, Steven J Siegel
Schizophrenia is a disabling psychiatric disease characterized by symptoms including hallucinations, delusions, social withdrawal, loss of pleasure, and inappropriate affect. Although schizophrenia is marked by dysfunction in dopaminergic and glutamatergic signaling, it is not presently clear how these dysfunctions give rise to symptoms. The aberrant salience hypothesis of schizophrenia argues that abnormal attribution of motivational salience to stimuli is one of the main contributors to both positive and negative symptoms of schizophrenia...
January 19, 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/29349576/prep1-deficiency-affects-olfactory-perception-and-feeding-behavior-by-impairing-bdnf-trkb-mediated-neurotrophic-signaling
#19
Serena Ricci, Davide Viggiano, Ilaria Cimmino, Giuseppe Perruolo, Serena Cabaro, Antonietta Liotti, Francesca Fiory, Rosa Spinelli, Angelina Di Carlo, Francesco Beguinot, Pietro Formisano, Francesco Oriente
Prep1 is a homeodomain transcription factor which has an important role in hindbrain development. Prep1 expression is also kept in adult mouse brain and in particular within the olfactory bulbs. Moreover, many Prep1 neurons co-localize with Calbindin-positive periglomerular interneurons in olfactory glomerular layer. However, Prep1 function in this brain region is still unknown. In this study, we show that Prep1 hypomorphic heterozygous (Prep1 i/+ ) mice express low levels of protein and feature a 30% reduction of olfactory bulb area, compared to WT mice...
January 18, 2018: Molecular Neurobiology
https://www.readbyqxmd.com/read/29349346/characteristics-of-electroencephalogram-signatures-in-sedated-patients-induced-by-various-anesthetic-agents
#20
REVIEW
Byung-Moon Choi
Devices that monitor the depth of hypnosis based on the electroencephalogram (EEG) have long been commercialized, and clinicians use these to titrate the dosage of hypnotic agents. However, these have not yet been accepted as standard monitoring devices for anesthesiology. The primary reason is that the use of these monitoring devices does not completely prevent awareness during surgery, and the development of these devices has not taken into account the neurophysiological mechanisms of hypnotic agents, thus making it possible to show different levels of unconsciousness in the same brain status...
December 2017: Journal of Dental Anesthesia and Pain Medicine
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