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https://www.readbyqxmd.com/read/29355709/magnesium-sulphate-induces-preconditioning-in-preterm-rodent-models-of-cerebral-hypoxia-ischemia
#1
Gabriella Koning, Ellinor Lyngfelt, Pernilla Svedin, Anna-Lena Leverin, Masako Jinnai, Pierre Gressens, Claire Thornton, Xiaoyang Wang, Carina Mallard, Henrik Hagberg
BACKGROUND: Brain injury in preterm infants represents a substantial clinical problem associated with development of motor impairment, cognitive deficits and psychiatric problems. According to clinical studies, magnesium sulphate (MgSO4) given to women in preterm labor reduces the risk of cerebral palsy in the offspring but the mechanisms behind its neuroprotective effects are still unclear. Our aim was to explore whether MgSO4 induces tolerance (preconditioning) in the preterm rodent brain...
January 17, 2018: International Journal of Developmental Neuroscience
https://www.readbyqxmd.com/read/29350438/astrocytic-glutamine-synthetase-is-expressed-in-the-neuronal-somatic-layers-and-down-regulated-proportionally-to-neuronal-loss-in-the-human-epileptic-hippocampus
#2
Ismini E Papageorgiou, Nektarios A Valous, Bernd Lahrmann, Hana Janova, Zin-Juan Klaft, Arend Koch, Ulf C Schneider, Peter Vajkoczy, Frank L Heppner, Niels Grabe, Niels Halama, Uwe Heinemann, Oliver Kann
Human mesial temporal lobe epilepsy (MTLE) features subregion-specific hippocampal neurodegeneration and reactive astrogliosis, including up-regulation of the glial fibrillary acidic protein (GFAP) and down-regulation of glutamine synthetase (GS). However, the regional astrocytic expression pattern of GFAP and GS upon MTLE-associated neurodegeneration still remains elusive. We assessed GFAP and GS expression in strict correlation with the local neuronal number in cortical and hippocampal surgical specimens from 16 MTLE patients using immunohistochemistry, stereology and high-resolution image analysis for digital pathology and whole-slide imaging...
January 19, 2018: Glia
https://www.readbyqxmd.com/read/29349722/bystin-bysl-as-a-possible-marker-of-severe-hypoxic-ischemic-changes-in-neuropathological-examination-of-forensic-cases
#3
Mieszko Olczak, Dominik Chutorański, Magdalena Kwiatkowska, Dorota Samojłowicz, Sylwia Tarka, Teresa Wierzba-Bobrowicz
Bystin (BYSL) is a 306-amino acid protein encoded in humans by the BYSL gene located on the 6p21.1 chromosome. It is conserved across a wide range of eukaryotes. BYSL was reported to be a sensitive marker for the reactive astrocytes induced by ischemia/reperfusion and chemical hypoxia in vitro and is considered to be one of the common characteristics of astrogliosis. In our study we examined whether BYSL could be used as a marker for hypoxic-ischemic changes in forensic cases. Groups suspected of acute hypoxic-ischemic changes presented strong BYSL expression in the cytoplasm of neocortical neurons especially in layers 3-5, that seemed to be short-lasting...
January 18, 2018: Forensic Science, Medicine, and Pathology
https://www.readbyqxmd.com/read/29346766/cell-type-specificity-of-callosally-evoked-excitation-and-feedforward-inhibition-in-the-prefrontal-cortex
#4
Paul G Anastasiades, Joseph J Marlin, Adam G Carter
Excitation and inhibition are highly specific in the cortex, with distinct synaptic connections made onto subtypes of projection neurons. The functional consequences of this selective connectivity depend on both synaptic strength and the intrinsic properties of targeted neurons but remain poorly understood. Here, we examine responses to callosal inputs at cortico-cortical (CC) and cortico-thalamic (CT) neurons in layer 5 of mouse prelimbic prefrontal cortex (PFC). We find callosally evoked excitation and feedforward inhibition are much stronger at CT neurons compared to neighboring CC neurons...
January 16, 2018: Cell Reports
https://www.readbyqxmd.com/read/29338380/transplantation-of-human-neural-progenitor-cells-reveals-structural-and-functional-improvements-in-the-spastic-han-wistar-rat-model-of-ataxia
#5
Ruslan L Nuryyev, Toni L Uhlendorf, Wesley Tierney, Suren Zatikyan, Oleg Kopyov, Alex Kopyov, Jessica Ochoa, William Van Trigt, Cindy S Malone, Randy W Cohen
The use of regenerative medicine to treat nervous system disorders like ataxia has been proposed to either replace or support degenerating neurons. In this study, we assessed the ability of human neural progenitor cells (hNPCs) to repair and restore the function of dying neurons within the spastic Han-Wistar rat (sHW), a model of ataxia. The sHW rat suffers from neurodegeneration of specific neurons, including cerebellar Purkinje cells and hippocampal CA3 pyramidal cells leading to the observed symptoms of forelimb tremor, hind-leg rigidity, gait abnormality, motor incoordination, and a shortened life span...
November 2017: Cell Transplantation
https://www.readbyqxmd.com/read/29335478/publisher-correction-marked-bias-towards-spontaneous-synaptic-inhibition-distinguishes-non-adapting-from-adapting-layer-5-pyramidal-neurons-in-the-barrel-cortex
#6
Ion R Popescu, Kathy Q Le, Rocío Palenzuela, Rebecca Voglewede, Ricardo Mostany
A correction to this article has been published and is linked from the HTML version of this paper. The error has been fixed in the paper.
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29330867/preferential-cholinergic-excitation-of-corticopontine-neurons
#7
Arielle L Baker, Ryan J O'Toole, Allan T Gulledge
Pyramidal neurons in layer 5 of the neocortex comprise two broad classes of projection neurons: corticofugal neurons, including corticopontine (CPn) neurons, and intratelencephalic neurons, including commissural/callosal (COM) neurons. These non-overlapping neuron subpopulations represent discrete cortical output channels contributing to perception, decision making, and behaviour. CPn and COM neurons have distinct morphological and physiological characteristics, and divergent responses to modulatory transmitters such as serotonin and acetylcholine (ACh)...
January 12, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29329401/morphological-and-functional-characterization-of-non-fast-spiking-gabaergic-interneurons-in-layer-4-microcircuitry-of-rat-barrel-cortex
#8
Vishalini Emmenegger, Guanxiao Qi, Haijun Wang, Dirk Feldmeyer
GABAergic interneurons are notorious for their heterogeneity, despite constituting a small fraction of the neuronal population in the neocortex. Classification of interneurons is crucial for understanding their widespread cortical functions as they provide a complex and dynamic network, balancing excitation and inhibition. Here, we investigated different types of non-fast-spiking (nFS) interneurons in Layer 4 (L4) of rat barrel cortex using whole-cell patch-clamp recordings with biocytin-filling. Based on a quantitative analysis on a combination of morphological and electrophysiological parameters, we identified 5 distinct types of L4 nFS interneurons: 1) trans-columnar projecting interneurons,2) locally projecting non-Martinotti-like interneurons, 3) supra-granular projecting Martinotti-like interneurons,4) intra-columnar projecting VIP-like interneurons,and5) locally projecting neurogliaform-like interneurons...
January 10, 2018: Cerebral Cortex
https://www.readbyqxmd.com/read/29326172/diversity-and-connectivity-of-layer-5-somatostatin-expressing-interneurons-in-the-mouse-barrel-cortex
#9
Nigro Maximiliano José, Yoshiko Hashikawa, Bernardo Rudy
Inhibitory interneurons represent 10-15% of the neurons in the somatosensory cortex, and their activity powerfully shapes sensory processing. Three major groups of GABAergic interneurons have been defined according to developmental, molecular, morphological, electrophysiological, and synaptic features. Dendritic-targeting somatostatin-expressing interneurons (SST-INs) have been shown to display diverse morphological, electrophysiological and molecular properties and activity patterns in vivo. However, the correlation between these properties and SST-IN subtype is unclear...
January 11, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29323039/neuronal-injury-and-tumor-necrosis-factor-alpha-immunoreactivity-in-the-rat-hippocampus-in-the-early-period-of-asphyxia-induced-cardiac-arrest-under-normothermia
#10
Hyun-Jin Tae, Il Jun Kang, Tae-Kyeong Lee, Jeong Hwi Cho, Jae-Chul Lee, Myoung Cheol Shin, Yoon Sung Kim, Jun Hwi Cho, Jong-Dai Kim, Ji Hyeon Ahn, Joon Ha Park, In-Shik Kim, Hyang-Ah Lee, Yang Hee Kim, Moo-Ho Won, Young Joo Lee
Low survival rate occurs in patients who initially experience a spontaneous return of circulation after cardiac arrest (CA). In this study, we induced asphyxial CA in adult male Sprague-Daley rats, maintained their body temperature at 37 ± 0.5°C, and then observed the survival rate during the post-resuscitation phase. We examined neuronal damage in the hippocampus using cresyl violet (CV) and Fluore-Jade B (F-J B) staining, and pro-inflammatory response using ionized calcium-binding adapter molecule 1 (Iba-1), glial fibrillary acidic protein (GFAP), and tumor necrosis factor-alpha (TNF-α) immunohistochemistry in the hippocampus after asphyxial CA in rats under normothermia...
December 2017: Neural Regeneration Research
https://www.readbyqxmd.com/read/29318854/-effect-of-electroacupuncture-on-intracellular-calcium-ion-concentration-and-expression-of-calcium-calmodulin-dependent-protein-kinase-%C3%A2-in-lumbar-spinal-cord-in-rats-with-neuropathic-pain
#11
Xin-Tian Wu, Wei Liang, Li-Ping Yan, Ling-Ling Wang, Cheng Ma
OBJECTIVE: To observe the changes of intracellular calcium ([Ca2+]i) concentration and expression of calcium/calmodulin dependent protein kinaseⅡ (CaMKⅡ) in spinal dorsal horn neurons of spared nerve injury (SNI) rats, so as to explore its mechanisms underlying improvement of neuropathic pain. METHODS: One hundred and ten SD rats were randomly divided into 5 groups: sham control, model, EA, AP-5 and L-NAME groups. The sham group underwent only a simple separation of the sciatic nerve but without ligation and abscission...
December 25, 2017: Zhen Ci Yan Jiu, Acupuncture Research
https://www.readbyqxmd.com/read/29317484/chemogenetic-excitation-of-accumbens-projecting-infralimbic-cortical-neurons-blocks-toluene-induced-conditioned-place-preference
#12
Wesley N Wayman, John J Woodward
Abuse rates for inhalants among adolescents continue to be high, yet preclinical models for studying mechanisms underlying inhalant abuse remain limited. Our lab has previously shown that, in male rats, an acute binge-like exposure to toluene vapor that mimics human solvent abuse modifies the intrinsic excitability of medial prefrontal cortex (mPFC) pyramidal neurons projecting to the nucleus accumbens (NAc). These changes showed region (infralimbic; IL vs. prelimbic; PRL), layer (shallow; 2/3 vs. deep; 5/6), target (core vs...
January 9, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29317262/sensitivity-to-strain-and-shear-stress-of-isolated-mechanosensitive-enteric-neurons
#13
Eva Maria Kugler, Klaus Michel, David Kirchenbüchler, Georg Dreissen, Agnes Csiszár, Rudolf Merkel, Michael Schemann, Gemma Mazzuoli-Weber
Within the enteric nervous system, the neurons in charge to control motility of the gastrointestinal tract reside in a particular location nestled between two perpendicular muscle layers which contract and relax. We used primary cultured myenteric neurons of male guinea pigs to study mechanosensitivity of enteric neurons in isolation. Ultrafast Neuroimaging with a voltage sensitive dye technique was used to record neuronal activity in response to shear stress and strain. Strain was induced by locally deforming the elastic cell culture substrate next to a neuron...
January 6, 2018: Neuroscience
https://www.readbyqxmd.com/read/29315422/dietary-therapy-restores-glutamatergic-input-to-orexin-hypocretin-neurons-after-traumatic-brain-injury-in-mice
#14
Jonathan E Elliott, Samuel E De Luche, Madeline J Churchill, Cindy Moore, Akiva S Cohen, Charles K Meshul, Miranda M Lim
Study Objectives: In previous work, dietary branched chain amino acid (BCAA) supplementation, precursors to de novo glutamate and gamma-aminobutyric acid (GABA) synthesis, restored impaired sleep-wake regulation and orexin neuronal activity post-traumatic brain injury (TBI) in mice. TBI was speculated to reduce orexin neuronal activity through decreased regional excitatory (glutamate) and/or increased inhibitory (GABA) input. Therefore, we hypothesized TBI would decrease synaptic glutamate and/or increase synaptic GABA in nerve terminals contacting orexin neurons, and BCAA supplementation would restore TBI-induced changes in synaptic glutamate and/or GABA...
January 5, 2018: Sleep
https://www.readbyqxmd.com/read/29309310/nuclear-translocation-of-dj-1-protects-adult-neuronal-stem-cells-in-an-mptp-mouse-model-of-parkinson-s-disease
#15
Yi Sun, Yupeng Wang, Xin Zhao, Xiaoping Pu
DJ-1, originally identified as an oncogene product, is involved in multiple processes, including cellular transformation, the oxidative stress response, and transcriptional regulation. We had previously found that DJ-1 was closely associated with the proliferation and differentiation of cultured neuronal stem cells. In this study, we further investigated the functions of DJ-1 to determine how adult neurogenesis was affected in the subgranular zones (SGZ), subventricular zone (SVZ), and olfactory bulb (OB), which are brain areas closely related to early nonmotor symptoms of Parkinson's disease, using a 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced mouse model of Parkinson's disease...
January 5, 2018: Neuroreport
https://www.readbyqxmd.com/read/29304147/the-organization-of-melanopsin-immunoreactive-cells-in-microbat-retina
#16
Mi-Jin Jeong, Hang-Gu Kim, Chang-Jin Jeon
Intrinsically photosensitive retinal ganglion cells (ipRGCs) respond to light and play roles in non-image forming vision, such as circadian rhythms, pupil responses, and sleep regulation, or image forming vision, such as processing visual information and directing eye movements in response to visual clues. The purpose of the present study was to identify the distribution, types, and proportion of melanopsin-immunoreactive (IR) cells in the retina of a nocturnal animal, i.e., the microbat (Rhinolophus ferrumequinum)...
2018: PloS One
https://www.readbyqxmd.com/read/29302200/reexamination-of-dopaminergic-amacrine-cells-in-the-rabbit-retina-confocal-analysis-with-double-and-triple-labeling-immunohistochemistry
#17
Jong Woo Lee, Min Young Lim, Yong Soo Park, Su Jin Park, In-Beom Kim
Dopaminergic amacrine cells (DACs) are among the most well-characterized neurons in the mammalian retina, and their connections to AII amacrine cells have been described in detail. However, the stratification of DAC dendrites differs based on their location in the inner plexiform layer (IPL), raising the question of whether all AII lobules are modulated by dopamine release from DACs. The present study aimed to clarify the relationship between DACs and AII amacrine cells, and to further elucidate the role of dopamine at synapses with AII amacrine cell...
December 2017: Experimental Neurobiology
https://www.readbyqxmd.com/read/29283181/loss-of-constitutive-functional-%C3%AE-aminobutyric-acid-type-a-b-receptor-crosstalk-in-layer-5-pyramidal-neurons-of-human-epileptic-temporal-cortex
#18
Katiuscia Martinello, Miriam Sciaccaluga, Roberta Morace, Addolorata Mascia, Antonietta Arcella, Vincenzo Esposito, Sergio Fucile
OBJECTIVE: γ-Aminobutyric acid (GABA) is the major inhibitory neurotransmitter in adult central nervous system, and profound alterations of GABA receptor functions are linked to temporal lobe epilepsy (TLE). Here we describe the functional relationships between GABA receptors type B (GABAB R) and type A (GABAA R) in human temporal cortex and how TLE affects this aspect of GABAergic signaling. METHODS: Miniature inhibitory postsynaptic currents (mIPSCs) were recorded by patch-clamp techniques from human L5 pyramidal neurons in slices from temporal cortex tissue obtained from surgery...
December 28, 2017: Epilepsia
https://www.readbyqxmd.com/read/29276127/feature-specific-organization-of-feedback-pathways-in-mouse-visual-cortex
#19
Carey Y L Huh, John P Peach, Corbett Bennett, Roxana M Vega, Shaul Hestrin
Higher and lower cortical areas in the visual hierarchy are reciprocally connected [1]. Although much is known about how feedforward pathways shape receptive field properties of visual neurons, relatively little is known about the role of feedback pathways in visual processing. Feedback pathways are thought to carry top-down signals, including information about context (e.g., figure-ground segmentation and surround suppression) [2-5], and feedback has been demonstrated to sharpen orientation tuning of neurons in the primary visual cortex (V1) [6, 7]...
December 15, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/29249953/learning-peri-saccadic-remapping-of-receptive-field-from-experience-in-lateral-intraparietal-area
#20
Xiao Wang, Yan Wu, Mingsha Zhang, Si Wu
Our eyes move constantly at a frequency of 3-5 times per second. These movements, called saccades, induce the sweeping of visual images on the retina, yet we perceive the world as stable. It has been suggested that the brain achieves this visual stability via predictive remapping of neuronal receptive field (RF). A recent experimental study disclosed details of this remapping process in the lateral intraparietal area (LIP), that is, about the time of the saccade, the neuronal RF expands along the saccadic trajectory temporally, covering the current RF (CRF), the future RF (FRF), and the region the eye will sweep through during the saccade...
2017: Frontiers in Computational Neuroscience
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