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https://www.readbyqxmd.com/read/28215029/an-introduction-to-the-pathophysiology-of-aneurysmal-subarachnoid-hemorrhage
#1
REVIEW
Jasper H van Lieshout, Maxine Dibué-Adjei, Jan F Cornelius, Philipp J Slotty, Toni Schneider, Tanja Restin, Hieronymus D Boogaarts, Hans-Jakob Steiger, Athanasios K Petridis, Marcel A Kamp
Pathophysiological processes following subarachnoid hemorrhage (SAH) present survivors of the initial bleeding with a high risk of morbidity and mortality during the course of the disease. As angiographic vasospasm is strongly associated with delayed cerebral ischemia (DCI) and clinical outcome, clinical trials in the last few decades focused on prevention of these angiographic spasms. Despite all efforts, no new pharmacological agents have shown to improve patient outcome. As such, it has become clear that our understanding of the pathophysiology of SAH is incomplete and we need to reevaluate our concepts on the complex pathophysiological process following SAH...
February 18, 2017: Neurosurgical Review
https://www.readbyqxmd.com/read/28214998/optimal-visual-haptic-integration-with-articulated-tools
#2
Chie Takahashi, Simon J Watt
When we feel and see an object, the nervous system integrates visual and haptic information optimally, exploiting the redundancy in multiple signals to estimate properties more precisely than is possible from either signal alone. We examined whether optimal integration is similarly achieved when using articulated tools. Such tools (tongs, pliers, etc) are a defining characteristic of human hand function, but complicate the classical sensory 'correspondence problem' underlying multisensory integration. Optimal integration requires establishing the relationship between signals acquired by different sensors (hand and eye) and, therefore, in fundamentally unrelated units...
February 18, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28214997/the-human-rit2-core-promoter-short-tandem-repeat-predominant-allele-is-species-specific-in-length-a-selective-advantage-for-human-evolution
#3
Babak Emamalizadeh, Abofazl Movafagh, Hossein Darvish, Somayeh Kazeminasab, Monavvar Andarva, Pegah Namdar-Aligoodarzi, Mina Ohadi
Evolutionary analyses of the critical core promoter interval support a selective advantage for expanding the length of certain short tandem repeats (STRs) in humans. We recently reported genome-wide data on human core promoter STRs that are "exceptionally long" (≥6-repeats). Near the top of the list, the neuron-specific gene, RIT2, contains one of the longest GA-STRs at 11-repeats. In the present study, we analyzed the evolutionary implications of this STR across species. We also studied this STR in a sample of 2,143 Iranian human subjects that encompassed a number of neuropsychiatric disorders and controls...
February 18, 2017: Molecular Genetics and Genomics: MGG
https://www.readbyqxmd.com/read/28214987/severe-convulsions-and-dysmyelination-in-both-jimpy-and-cx32-47-mice-may-associate-astrocytic-l-channel-function-with-myelination-and-oligodendrocytic-connexins-with-internodal-kv-channels
#4
Y H Gerald Chaban, Ye Chen, Elna Hertz, Leif Hertz
The Jimpy mouse illustrates the importance of interactions between astrocytes and oligodendrocytes. It has a mutation in Plp coding for proteolipid protein and DM20. Its behavior is normal at birth but from the age of ~2 weeks it shows severe convulsions associated with oligodendrocyte/myelination deficits and early death. A normally occurring increase in oxygen consumption by highly elevated K(+) concentrations is absent in Jimpy brain slices and cultured astrocytes, reflecting that Plp at early embryonic stages affects common precursors as also shown by the ability of conditioned medium from normal astrocytes to counteract histological abnormalities...
February 18, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/28214986/astrocyte-sodium-signalling-and-panglial-spread-of-sodium-signals-in-brain-white-matter
#5
Behrouz Moshrefi-Ravasdjani, Evelyn L Hammel, Karl W Kafitz, Christine R Rose
In brain grey matter, excitatory synaptic transmission activates glutamate uptake into astrocytes, inducing sodium signals which propagate into neighboring astrocytes through gap junctions. These sodium signals have been suggested to serve an important role in neuro-metabolic coupling. So far, it is unknown if astrocytes in white matter-that is in brain regions devoid of synapses-are also able to undergo such intra- and intercellular sodium signalling. In the present study, we have addressed this question by performing quantitative sodium imaging in acute tissue slices of mouse corpus callosum...
February 18, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/28214984/dl-3-n-butylphthalide-nbp-provides-neuroprotection-in-the-mice-models-after-traumatic-brain-injury-via-nrf2-are-signaling-pathway
#6
Zhengwei Liu, Handong Wang, Xiaofeng Shi, Liwen Li, Mengliang Zhou, Hui Ding, Youqing Yang, Xiang Li, Ke Ding
The present study was aimed to evaluate the neuroprotective effects of NBP in the mice models of TBI, as well as the possible role of Nrf2-ARE pathways in the assumptive neuroprotection. In mice,a modified Marmarou's weight-drop model was employed to induce TBI. ICR mice were randomly assigned to four experimental groups: sham, TBI, TBI+vehicle(V) and TBI+NBP. NBP (100 mg/kg) was administered via an intraperitoneal (i.p.) injection at 1 h following TBI. The administration of NBP significantly ameliorated the effects of the brain injury, including neurological deficits, brain water content, and cortical neuronal apoptosis...
February 18, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/28214972/avocado-oil-induces-long-term-alleviation-of-oxidative-damage-in-kidney-mitochondria-from-type-2-diabetic-rats-by-improving-glutathione-status
#7
Omar Ortiz-Avila, María Del Consuelo Figueroa-García, Claudia Isabel García-Berumen, Elizabeth Calderón-Cortés, Jorge A Mejía-Barajas, Alain R Rodriguez-Orozco, Ricardo Mejía-Zepeda, Alfredo Saavedra-Molina, Christian Cortés-Rojo
Hyperglycemia and mitochondrial ROS overproduction have been identified as key factors involved in the development of diabetic nephropathy. This has encouraged the search for strategies decreasing glucose levels and long-term improvement of redox status of glutathione, the main antioxidant counteracting mitochondrial damage. Previously, we have shown that avocado oil improves redox status of glutathione in liver and brain mitochondria from streptozotocin-induced diabetic rats; however, the long-term effects of avocado oil and its hypoglycemic effect cannot be evaluated because this model displays low survival and insulin depletion...
February 18, 2017: Journal of Bioenergetics and Biomembranes
https://www.readbyqxmd.com/read/28214967/increased-atrial-%C3%AE-adrenergic-receptors-and-grk-2-gene-expression-can-play-a-fundamental-role-in-heart-failure-after-repair-of-congenital-heart-disease-with-cardiopulmonary-bypass
#8
Marcela Silva Oliveira, Fabio Carmona, Walter V A Vicente, Paulo H Manso, Karina M Mata, Mara Rúbia Celes, Erica C Campos, Simone G Ramos
Surgeries to correct congenital heart diseases are increasing in Brazil and worldwide. However, even with the advances in surgical techniques and perfusion, some cases, especially the more complex ones, can develop heart failure and death. A retrospective study of patients who underwent surgery for correction of congenital heart diseases with cardiopulmonary bypass (CPB) in a university tertiary-care hospital that died, showed infarction in different stages of evolution and scattered microcalcifications in the myocardium, even without coronary obstruction...
February 18, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28214960/axonal-disruption-in-white-matter-underlying-cortical-sulcus-tau-pathology-in-chronic-traumatic-encephalopathy
#9
Laurena Holleran, Joong Hee Kim, Mihika Gangolli, Thor Stein, Victor Alvarez, Ann McKee, David L Brody
Chronic traumatic encephalopathy (CTE) is a progressive degenerative disorder associated with repetitive traumatic brain injury. One of the primary defining neuropathological lesions in CTE, based on the first consensus conference, is the accumulation of hyperphosphorylated tau in gray matter sulcal depths. Post-mortem CTE studies have also reported myelin loss, axonal injury and white matter degeneration. Currently, the diagnosis of CTE is restricted to post-mortem neuropathological analysis. We hypothesized that high spatial resolution advanced diffusion MRI might be useful for detecting white matter microstructural changes directly adjacent to gray matter tau pathology...
February 18, 2017: Acta Neuropathologica
https://www.readbyqxmd.com/read/28214930/investigation-of-optical-neuro-monitoring-technique-for-detection-of-maintenance-and-emergence-states-during-general-anesthesia
#10
Gabriela Hernandez-Meza, Meltem Izzetoglu, Mary Osbakken, Michael Green, Hawa Abubakar, Kurtulus Izzetoglu
The American Society of Anesthesiologist recommends peripheral physiological monitoring during general anesthesia, which offers no information regarding the effects of anesthetics on the brain. Since no "gold standard" method exists for this evaluation, such a technique is needed to ensure patient comfort, procedure quality and safety. In this study we investigated functional near infrared spectroscopy (fNIRS) as possible monitor of anesthetic effects on the prefrontal cortex. Anesthetic drugs, such as sevoflurane, suppress the cerebral metabolism and alter the cerebral blood flow...
February 18, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/28214927/spatiotemporal-differentiation-in-auditory-and-motor-regions-during-auditory-phoneme-discrimination
#11
Annelies Aerts, Gregor Strobbe, Pieter van Mierlo, Robert J Hartsuiker, Paul Corthals, Patrick Santens, Miet De Letter
Auditory phoneme discrimination (APD) is supported by both auditory and motor regions through a sensorimotor interface embedded in a fronto-temporo-parietal cortical network. However, the specific spatiotemporal organization of this network during APD with respect to different types of phonemic contrasts is still unclear. Here, we use source reconstruction, applied to event-related potentials in a group of 47 participants, to uncover a potential spatiotemporal differentiation in these brain regions during a passive and active APD task with respect to place of articulation (PoA), voicing and manner of articulation (MoA)...
February 18, 2017: Acta Neurologica Belgica
https://www.readbyqxmd.com/read/28214917/mtss1-promotes-maturation-and-maintenance-of-cerebellar-neurons-via-splice-variant-specific-effects
#12
Thorsten Sistig, Fanziska Lang, Sebastian Wrobel, Stephan L Baader, Karl Schilling, Britta Eiberger
Efficient coupling of the actin cytoskeleton to the cell membrane is crucial for histogenesis and maintenance of the nervous system. At this critical interface, BAR (Bin-Amphiphysin-Rvs) proteins regulate membrane bending, shown to be instrumental for mobility and morphogenesis of individual cells. Yet, the systemic significance of these proteins remains largely unexplored. Here, we probe the role of a prominent member of this protein family, the inverse-BAR protein Mtss1, for the development and function of a paradigmatic neuronal circuit, the cerebellar cortex...
February 18, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28214898/early-development-of-parvalbumin-somatostatin-and-cholecystokinin-expressing-neurons-in-rat-brain-following-prenatal-immune-activation-and-maternal-iron-deficiency
#13
Patricia Boksa, Ying Zhang, Dominique Nouel, Alice Wong, Tak Pan Wong
Prenatal maternal infection and maternal iron deficiency during pregnancy are 2 early environmental insults associated with increased risk for schizophrenia in offspring. Substantial evidence suggests that abnormalities in inhibitory γ-aminobutyric acid (GABA) interneuron function, especially in the parvalbumin subtype of GABA interneuron, both developmentally and in adulthood, may contribute mechanistically to cognitive deficits and psychotic symptoms in schizophrenia. This study used a rat model to test whether prenatal immune activation with lipopolysaccharide (LPS; at gestation days, GD, 15 and 16) or maternal iron deficiency (from GD2 to postnatal day P7) or the combination of both insults alters major subtypes of GABAergic interneurons (parvalbumin, somatostatin, cholecystokinin) in brain regions relevant to schizophrenia (medial and dorsolateral prefrontal cortex [PFC], hippocampal CA1 and dentate gyrus, ventral subiculum) in offspring at P14 or P28...
February 18, 2017: Developmental Neuroscience
https://www.readbyqxmd.com/read/28214874/heat-acclimation-regulates-the-autophagy-lysosome-function-to-protect-against-heat-stroke-induced-brain-injury-in-mice
#14
Junfeng Yi, Genlin He, Ju Yang, Zhen Luo, Xuesen Yang, Xue Luo
BACKGROUND/AIMS: The mechanisms underlying the protective role of heat acclimation (HA) in heat stroke (HS)-induced brain injury are still unclear. The autophagy-lysosome pathway is known to pay an important role in protecting stressed or diseased cells from death. Nevertheless, whether autophagy and lysosomes are involved in HA-mediated neuroprotection following HS exposure remains unclear. METHODS: The protective effects of HA were assessed by rectal temperature, hematoxylin-eosin staining, transmission electron microscopic analysis, terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling staining, and Fluoro Jade B staining, after mice were subjected to HS...
January 18, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28214871/restraint-stress-during-pregnancy-rapidly-raises-kynurenic-acid-levels-in-mouse-placenta-and-fetal-brain
#15
Francesca M Notarangelo, Robert Schwarcz
Stressful events during pregnancy adversely affect brain development and may increase the risk of psychiatric disorders later in life. Early changes in the kynurenine (KYN) pathway (KP) of tryptophan (TRP) degradation, which contains several neuroactive metabolites, including kynurenic acid (KYNA), 3-hydroxykynurenine (3-HK), and quinolinic acid (QUIN), may constitute a molecular link between prenatal stress and delayed pathological consequences. To begin testing this hypothesis experimentally, we examined the effects of a 2-h restraint stress on KP metabolism in pregnant FVB/N mice on gestational day 17...
February 18, 2017: Developmental Neuroscience
https://www.readbyqxmd.com/read/28214856/the-central-nervous-system-of-jawless-vertebrates-encephalization-in-lampreys-and-hagfishes
#16
Carlos A Salas, Kara E Yopak, Thomas J Lisney, Ian C Potter, Shaun P Collin
Lampreys and hagfishes are the sole surviving representatives of the early agnathan (jawless) stage in vertebrate evolution, which has previously been regarded as the least encephalized group of all vertebrates. Very little is known, however, about the extent of interspecific variation in relative brain size in these fishes, as previous studies have focused on only a few species, even though lampreys exhibit a variety of life history traits. While some species are parasitic as adults, with varying feeding behaviors, others (nonparasitic species) do not feed after completing their macrophagous freshwater larval phase...
February 18, 2017: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/28214829/ephb4-regulates-self-renewal-proliferation-and-neuronal-differentiation-of-human-embryonic-neural-stem-cells-in-vitro
#17
Tingting Liu, Xianwei Zeng, Fangling Sun, Hongli Hou, Yunqian Guan, Deyu Guo, Houxi Ai, Wen Wang, Guojun Zhang
BACKGROUND/AIMS: EphB4 belongs to the largest family of Eph receptor tyrosine kinases. It contributes to a variety of pathological progresses of cancer malignancy. However, little is known about its role in neural stem cells (NSCs). This study examined whether EphB4 is required for proliferation and differentiation of human embryonic neural stem cells (hNSCs) in vitro. METHODS: We up- and down-regulated EphB4 expression in hNSCs using lentiviral over-expression and shRNA knockdown constructs and then investigated the influence of EphB4 on the properties of hNSCs...
February 16, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28214828/role-for-target-of-rapamycin-mtor-signal-pathway-in-regulating-neuronal-injury-after-intracerebral-hemorrhage
#18
Jie-Ping Wang, Meng-Yu Zhang
BACKGROUND/AIMS: Mammalian target of rapamycin (mTOR) is a serine/threonine protein kinase and activation of its signal pathway plays an important role in regulating protein growth and synthesis as well as cell proliferation and survival. In the present study, we examined the contribution of mTOR signal and its downstream products to brain injuries induced by intracerebral hemorrhage (ICH) in rats. METHODS: Western Blot analysis was employed to examine the protein expression of mTOR and its downstream pathway and Caspase-3...
January 18, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28214680/exploring-the-role-of-testosterone-in-the-cerebellum-link-to-neuroticism-from-adolescence-to-early-adulthood
#19
Dennis J L G Schutter, Rosa Meuwese, Marieke G N Bos, Eveline A Crone, Jiska S Peper
Previous research has found an association between a smaller cerebellar volume and higher levels of neuroticism. The steroid hormone testosterone reduces stress responses and the susceptibility to negative mood. Together with in vitro studies showing a positive effect of testosterone on cerebellar gray matter volumes, we set out to explore the role of testosterone in the relation between cerebellar gray matter and neuroticism. Structural magnetic resonance imaging scans were acquired, and indices of neurotic personality traits were assessed by administering the depression and anxiety scale of the revised NEO personality inventory and Gray's behavioural avoidance in one hundred and forty-nine healthy volunteers between 12 and 27 years of age...
January 29, 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/28214641/posterior-reversible-encephalopathy-syndrome-causing-vision-loss-following-endoscopic-endonasal-resection-of-pituitary-adenoma-a-case-report
#20
Nicolas W Villelli, Daniel M Prevedello, Daniel S Ikeda, Alaa S Montaser, Bradley A Otto, Ricardo L Carrau
BACKGROUND: Posterior Reversible Encephalopathy Syndrome (PRES) is characterized by headache, altered mental status, visual changes, and seizure combined with brain imaging consistent with cerebral edema without infarction. To the best of our knowledge, we report the first case of PRES following an endoscopic endonasal resection of a pituitary macroadenoma. CASE DESCRIPTION: A 59-year-old female was diagnosed with a pituitary macroadenoma, for which she underwent endoscopic endonasal extracapsular resection...
February 15, 2017: World Neurosurgery
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