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Neuroscience

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https://www.readbyqxmd.com/read/29462706/biomaterials-cues-to-direct-a-pro-regenerative-phenotype-in-macrophages-and-schwann-cells
#1
Melissa R Wrobel, Harini G Sundararaghavan
Following peripheral nerve injury (PNI), inflammatory cues impede repair. We have previously demonstrated that spinal cord matrix (SCM) proteins and hyaluronic acid (HA) nanofibers mitigate chondroitin sulfate proteoglycan (CSPG) inhibition and promote growth in peripheral neurons. In this study, we evaluated the effects of a characteristic CSPG, Chondroitin sulfate A (CSA), SCM, and HA fibers on macrophages and Schwann Cells (SCs). We hypothesized that our cues would accelerate the macrophages return to rest following classical activation (M1/pro-inflammatory) with lipopolysaccharide (LPS; 1μg/mL) and would accelerate the transformation of SCs from an immature state following injury to a mature/pro-myelinating phenotype...
February 17, 2018: Neuroscience
https://www.readbyqxmd.com/read/29462705/nitric-oxide-and-mitochondrial-function-in-neurological-diseases
#2
REVIEW
Mehdi Ghasemi, Yunis Mayasi, Anas Hannoun, Seyed Majid Eslami, Raphael Carandang
Mitochondria are key cellular organelles that play crucial roles in the energy production and regulation of cellular metabolism. Accumulating evidence suggests that mitochondrial activity can be modulated by nitric oxide (NO). As a key neurotransmitter in biologic systems, NO mediates the majority of its function through activation of the cyclic guanylyl cyclase (cGC) signaling pathway and S-nitrosylation of a variety of proteins involved in cellular functioning including those involved in mitochondrial biology...
February 17, 2018: Neuroscience
https://www.readbyqxmd.com/read/29462704/enhancement-of-endocannabinoid-dependent-depolarization-induced-suppression-of-excitation-in-glycinergic-neurons-by-prolonged-exposure-to-high-doses-of-salicylate
#3
João Zugaib, Ricardo M Leão
The Dorsal Cochlear Nucleus (DCN) is a region which has been traditionally linked to the genesis of tinnitus, the constant perception of a phantom sound. Sodium salicylate, a COX-2 inhibitor, can induce tinnitus in high doses. Hyperactivity of DCN neurons is observed in several animal models of tinnitus, including salicylate-induced tinnitus. The DCN presents several forms of endocannabinoid (EC) dependent synaptic plasticity and COX-2 can also participate in the oxidative degradation of ECs. We recently demonstrated that short-term perfusion of sodium salicylate and other inhibitors of both oxidative and hydrolytic EC degradation did not affect depolarization-induced suppression of excitation (DSE), a form of EC- dependent short-term synaptic plasticity...
February 17, 2018: Neuroscience
https://www.readbyqxmd.com/read/29462703/lifelong-aerobic-exercise-reduces-the-stress-response-in-rats
#4
A Pietrelli, M Di Nardo, A Masucci, A Brusco, N Basso, L Matkovic
The aim of this study was to analyze the effects of lifelong aerobic exercise (AE) on the adaptive response of the stress system in rats. It is well known that hypothalamic-pituitary-adrenal axis (HPA) activity differs when triggered by voluntary or forced exercise models. Male Wistar rats belonging to exercise (E) or control (C) groups were subjected to chronic AE, and two cutoff points were established at 8 (middle age) and 18 months (old age) of age. Behavioral, biochemical and histopathological studies were performed on the main components/targets of the stress system...
February 17, 2018: Neuroscience
https://www.readbyqxmd.com/read/29462702/cell-type-specific-intrinsic-perithreshold-oscillations-in-hippocampal-gabaergic-interneurons
#5
Young-Jin Kang, Hannah Elisabeth Smashey Lewis, Mason William Young, Gubbi Govindaiah, Lazar John Greenfield, Edgar Garcia-Rill, Sang-Hun Lee
The hippocampus plays a critical role in learning, memory, and spatial processing through coordinated network activity including theta and gamma oscillations. Recent evidence suggests that hippocampal subregions (e.g., CA1) can generate these oscillations at the network level, at least in part, through GABAergic interneurons. However, it is unclear whether specific GABAergic interneurons generate intrinsic theta and/or gamma oscillations at the single cell level. Since major types of CA1 interneurons (i.e., parvalbumin-positive basket cells (PVBCs), cannabinoid type 1 receptor-positive basket cells (CB1 BCs), Schaffer collateral-associated cells (SCAs), neurogliaform cells and ivy cells) are thought to play key roles in network theta and gamma oscillations in the hippocampus, we tested the hypothesis that these cells generate intrinsic perithreshold oscillations at the single cell level...
February 17, 2018: Neuroscience
https://www.readbyqxmd.com/read/29462701/quantitative-comparison-of-vesicular-glutamate-transporters-in-rat-deep-cerebellar-nuclei
#6
Haian Mao, Salah Hamodeh, Fahad Sultan
The excitatory synapses of the rat deep cerebellar nuclei (DCN) were quantitatively analyzed by vesicular glutamate transporter 1 and 2 (vGluT1 and vGluT2) immunolabeling. We calculated the number and sizes of the labelled boutons and compared them between lateral /dentate nucleus (LN/DN), posterior interposed nucleus (PIN), anterior interposed nucleus (AIN), and medial nucleus (MN). The density of vGluT1+ boutons differs significantly within these nuclei. In contrast, the vGluT2+ bouton density is more similar between different nuclei...
February 17, 2018: Neuroscience
https://www.readbyqxmd.com/read/29454635/sleep-behavior-and-eeg-oscillations-in-aged-dp-16-1yey-mice-a-down-syndrome-model
#7
J Levenga, D J Peterson, P Cain, C A Hoeffer
Down syndrome (DS) results from the triplication of genes located on human chromosome 21 (Hsa21). Though many cognitive and behavioral impairments are associated with DS, sleep disturbances remain poorly understood despite being a reported phenotype in approximately 60% of individuals diagnosed with DS. In this study, sleep and electroencephalography (EEG) oscillations were recorded from aged (12-14 mos.) Dp(16)1Yey/+ mice (Dp16), a mouse model of DS. We observed disrupted sleep demonstrated by increased activity during the dark phase and increased time awake at the expense of NREM sleep compared to wild-type mice...
February 15, 2018: Neuroscience
https://www.readbyqxmd.com/read/29454102/inflammation-as-a-possible-link-between-dyslipidemia-and-alzheimer-s-disease
#8
REVIEW
Bruno Cabral de Lima Oliveira, Paula Maria Quaglio Bellozi, Helton José Reis, Antônio Carlos Pinheiro de Oliveira
Alzheimer's disease (AD) is the leading cause of dementia worldwide. This pathological condition is characterized not only by Aβ and tau accumulation in the central nervous system (CNS), but also by inflammation, processes that can lead to neurodegeneration. Besides that, other factors may contribute to the development of AD, such as dyslipidemias. Changes in lipid levels can either influence the activity of enzymes related to the protein deposition that occurs in this pathological condition, or enhance the peripheral and CNS immune responses...
February 14, 2018: Neuroscience
https://www.readbyqxmd.com/read/29452226/quantitative-proteomic-analysis-reveals-synaptic-dysfunction-in-the-amygdala-of-rats-susceptible-to-chronic-mild-stress
#9
Mi Zhou, Zhao Liu, Jia Yu, Shuiming Li, Min Tang, Li Zeng, Haiyang Wang, Hong Xie, Li Peng, Haojun Huang, Chanjuan Zhou, Peng Xie, Jian Zhou
The amygdala plays a key role in the pathophysiology of depression, but the molecular mechanisms underlying amygdalar hyperactivity in depression remain unclear. In this study, we used a chronic mild stress (CMS) protocol to separate susceptible and insusceptible rat subgroups. Proteomes in the amygdalae were analyzed differentially across subgroups based on labeling with isobaric tags for relative and absolute quantitation (iTRAQ) combined with mass spectrometry. Of 2,562 quantified proteins, 102 were differentially expressed...
February 13, 2018: Neuroscience
https://www.readbyqxmd.com/read/29447858/intrathecal-injection-of-scaav9-higf1-prolongs-the-survival-of-als-model-mice-by-inhibiting-the-nf-kb-pathway
#10
HaoJie Hu, HuiQian Lin, WeiSong Duan, Can Cui, ZhongYao Li, YaKun Liu, Wan Wang, Di Wen, Ying Wang, ChunYan Li
Amyotrophic lateral sclerosis (ALS) is a chronic, fatal neurodegenerative disorder characterized by the progressive loss of upper and lower motor neurons. Currently, there is no effective drug for ALS. Recent studies in ALS model mice have shown that insulin-like growth factor-1 (IGF1) may be a promising therapeutic drug. We demonstrate that self-complementary adeno-associated virus serum type 9 encoding the human IGF1 (scAAV9-hIGF1) could significantly postpone the onset and slow down the progression of the disease owning to inhibiting the NF-κB signalling pathway...
February 12, 2018: Neuroscience
https://www.readbyqxmd.com/read/29438804/axonal-activation-of-the-unfolded-protein-response-promotes-axonal-regeneration-following-peripheral-nerve-injury
#11
Yosuke Ohtake, Koji Matsuhisa, Masayuki Kaneko, Soshi Kanemoto, Rie Asada, Kazunori Imaizumi, Atsushi Saito
Adult mammalian peripheral neurons have an intrinsic regrowth capacity in response to axonal injury. The induction of calcium ion (Ca 2+ ) oscillations at an injured site is critical for the regulation of regenerative responses. In polarized neurons, distal axonal segments contain a well-developed endoplasmic reticulum (ER) network that is responsible for Ca 2+ homeostasis. Although these characteristics implicate the relevance among injury-induced Ca 2+ dynamics, axonal ER-derived signaling, and regenerative responses propagated along the axons, the details are not fully understood...
February 10, 2018: Neuroscience
https://www.readbyqxmd.com/read/29438803/sleep-state-dependence-of-optogenetically-evoked-responses-in-neuronal-nitric-oxide-synthase-positive-cells-of-the-cerebral-cortex
#12
Dmitry Gerashchenko, Michelle A Schmidt, Mark R Zielinski, Michele E Moore, Jonathan P Wisor
Slow-wave activity (SWA) in the electroencephalogram during slow-wave sleep (SWS) varies as a function of sleep-wake history. A putative sleep-active population of neuronal nitric oxide synthase (nNOS)-containing interneurons in the cerebral cortex, defined as such by the expression of Fos in animals euthanized after protracted deep sleep, may be a local regulator of SWA. We investigated whether electrophysiological responses to activation of these cells are consistent with their role of a local regulator of SWA...
February 10, 2018: Neuroscience
https://www.readbyqxmd.com/read/29438802/endocannabinoid-signaling-in-embryonic-neuronal-motility-and-cell-cell-contact-role-of-mglur5-and-trpc3-channels
#13
Pauli M Turunen, Lauri M Louhivuori, Verna Louhivuori, Jyrki P Kukkonen, Karl E Åkerman
Cell-cell communication plays a central role in the guidance of migrating neuronal precursor cells during the development of the cerebral cortex. Endocannabinoids (eCBs) have previously been shown to be one of the central factors regulating neuronal migration. In this study the effects of eCBs on different parameters, expected to affect embryonic cortical neuronal motility have been analyzed in neurosphere derived neuroblasts using time-lapse microscopy. Increased endogenous production of the endocannabinoid 2-arachidonyl glycerol (2-AG) causes bursts of neuroblast motility...
February 10, 2018: Neuroscience
https://www.readbyqxmd.com/read/29438801/specific-activity-features-in-the-forced-swim-test-brain-neurotrophins-and-development-of-stress-induced-depressive-like-behavior-in-rats
#14
Mikhail Stepanichev, Anna Manolova, Danil Peregud, Mikhail Onufriev, Sofia Freiman, Viktor Aniol, Yulia Moiseeva, Margarita Novikova, Natalia Lazareva, Natalia Gulyaeva
Selective vulnerability or resilience to mood disorders is related to individual differences or personality. In the present study forced swim test (FST) was used as a tool for division of male rats according to their immobility behavior. The animals were subjected to a chronic unpredictable mild stress (CUS). Depressive-like behavior and modifications in brain neurotrophin system of were examined after CUS exposure. The low immobile (LI) and high immobile (HI) rats demonstrated elusive differences in expression of BDNF ExVI mRNA and TrkA mRNA which was higher in hippocampus and frontal cortex, respectively, of HI rats as compared to LI animals...
February 10, 2018: Neuroscience
https://www.readbyqxmd.com/read/29438800/intracellular-ph-regulation-in-ipscs-derived-astrocytes-from-subjects-with-chronic-mountain-sickness
#15
Hang Yao, Helen Zhao, Juan Wang, Gabriel G Haddad
Chronic Mountain Sickness (CMS) occurs in high altitude residence with major neurological symptoms such as migraine headaches, dizziness and cognitive deficits. Recent work demonstrated that highlanders have increased intracellular pH (pH i ) in their brain cells, perhaps for the sake of adaptation to hypoxemia and help to facilitate glycolysis, DNA synthesis, and cell cycle progression. Since there are well adapted (non-CMS) and maladapted (CMS) high altitude dwellers, it is not clear whether pH i is differently regulated in these two high altitude populations...
February 10, 2018: Neuroscience
https://www.readbyqxmd.com/read/29432887/role-of-brain-neuroinflammatory-factors-on-hypertension-in-the-spontaneously-hypertensive-rat
#16
Ennio Avolio, Teresa Pasqua, Anna Di Vito, Gilda Fazzari, Gabriella Cardillo, Raffaella Alò, Maria Carmela Cerra, Tullio Barni, Tommaso Angelone, Marcello Canonaco
It is already widely known that the different brain areas involved in blood pressure control, are highly vulnerable to the deleterious effects of this condition. Of particular concern are hypertensive and neuroinflammatory-dependent injuries that by modifying blood flow account for artery structural and functional alterations. It was thus our intention to establish if expression changes of some key brain neuroinflammatory factors like caspase-1,3, NF-kB, IL-1β and NLRP3, which are known to control blood pressure, are actively involved with inflammation regulatoryevents in a highly valuable spontaneously hypertensive rat (SHR) model...
February 9, 2018: Neuroscience
https://www.readbyqxmd.com/read/29432886/on-information-metrics-for-spatial-coding
#17
Bryan C Souza, Rodrigo Pavão, Hindiael Belchior, Adriano B L Tort
The hippocampal formation is involved in navigation, and its neuronal activity exhibits a variety of spatial correlates (e.g., place cells, grid cells). The quantification of the information encoded by spikes has been standard procedure to identify which cells have spatial correlates. For place cells, most of the established metrics derive from Shannon's mutual information (Shannon, 1948), and convey information rate in bits/sec or bits/spike (Skaggs et al., 1993; Skaggs et al., 1996). Despite their widespread use, the performance of these metrics in relation to the original mutual information metric has never been investigated...
February 9, 2018: Neuroscience
https://www.readbyqxmd.com/read/29432885/repetitive-brain-injury-of-juvenile-mice-impairs-environmental-enrichment-induced-modulation-of-rem-sleep-in-adulthood
#18
Jeremy C Borniger, Kyra Ungerleider, Ning Zhang, Kate Karelina, Ulysses J Magalang, Zachary M Weil
Traumatic brain injuries (TBI) are a common and costly ongoing public health concern. Injuries that occur during childhood development can have particularly profound and long-lasting effects. One common consequence and potential mediator of negative outcomes of TBI is sleep disruption which occurs in a substantial proportion of TBI patients. These individuals report greater incidences of insomnia and sleep fragmentation combined with a greater overall sleep requirement meaning that many patients are chronically sleep-deprived...
February 9, 2018: Neuroscience
https://www.readbyqxmd.com/read/29432884/the-changing-sensory-and-sympathetic-innervation-of-the-young-adult-and-aging-mouse-femur
#19
Stephane R Chartier, Stefanie A T Mitchell, Lisa A Majuta, Patrick W Mantyh
Although bone is continually being remodeled and ultimately declines with aging, little is known whether similar changes occur in the sensory and sympathetic nerve fibers that innervate bone. Here, immunohistochemistry and confocal microscopy were used to examine changes in the sensory and sympathetic nerve fibers that innervate the young (10 days post-partum), adult (3 months) and aging (24 months) C57Bl/6 mouse femur. In all three ages examined, the periosteum was the most densely innervated bone compartment...
February 9, 2018: Neuroscience
https://www.readbyqxmd.com/read/29432883/regulation-of-phosphorylation-of-ampa-glutamate-receptors-by-muscarinic-m4-receptors-in-the-striatum-in-vivo
#20
Li-Min Mao, Nan He, Dao-Zhong Jin, John Q Wang
The acetylcholine muscarinic 4 (M4) receptor is a principal muscarinic receptor subtype present in the striatum. Notably, Gαi/o-coupled M4 receptors and Gαs/Golf-coupled dopamine D1 receptors are coexpressed in striatonigral projection neurons and are thought to interact with each other to regulate neuronal excitability, although underlying molecular mechanisms are poorly understood. In this study, we investigated the role of M4 receptors in the regulation of phosphorylation of α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors in the rat normal and dopamine-stimulated striatum in vivo...
February 9, 2018: Neuroscience
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