Article added to library!
x
Pubchase is a service of protocols.io - free, open access, crowdsourced protocols repository. Explore protocols.
Sign in
Reset password
or connect with
Facebook
By signing in you are agreeing to our
Terms Of Service and Privacy Policy
Neuroscience
Preventive strategies for mental health.
May 18, 2018   The Lancet. Psychiatry
Arango C, Díaz-Caneja CM, McGorry PD, Rapoport J, Sommer IE, Vorstman JA, McDaid D, Marín O, Serrano-Drozdowskyj E, Freedman R, Carpenter W
Preventive strategies for mental health.
May 18, 2018
The Lancet. Psychiatry
Available treatment methods have shown little effect on the burden associated with mental health disorders. We review promising universal, selective, and indicated preventive mental health strategies that might reduce the incidence of mental health disorders, or shift expected trajectories to less debilitating outcomes. Some of these interventions also seem to be cost-effective. In the transition to mental illness, the cumulative lifetime effect of multiple small effect size risk factors progressively increases vulnerability to mental health disorders. This process might inform different levels and stages of tailored interventions to lessen risk, or increase protective factors and resilience, especially during sensitive developmental periods. Gaps between knowledge, policy, and practice need to be bridged. Future steps should emphasise mental health promotion, and improvement of early detection and interventions in clinical settings, schools, and the community, with essential support from society and policy makers.
Periodic Variation of AAK1 in an Aβ1-42-Induced Mouse Model of Alzheimer's Disease.
May 18, 2018   Journal Of Molecular Neuroscience : MN
Fu X, Ke M, Yu W, Wang X, Xiao Q, Gu M, Lü Y
Periodic Variation of AAK1 in an Aβ1-42-Induced Mouse Model of Alzheimer's Disease.
May 18, 2018
Journal Of Molecular Neuroscience : MN
Inhibition of endocytosis in an Alzheimer's disease (AD) model has been shown to be able to prevent amyloid β (Aβ)-induced damage and to exert a beneficial effect in treating AD. Adaptor-associated kinase 1 (AAK1), which binds to the adaptor protein complex 2 (AP-2), regulates the process of clathrin-mediated endocytosis. However, how AAK1 expression varies over the course of AD is unknown. In this study, we investigated AAK1 levels in AD model mice over time. Aβ1-42 was used to establish a mouse AD model, and the Morris water maze test was used to characterize the time course of Aβ1-42-induced cognition changes. ELISA was used to determine AAK1 levels in plasma and Aβ1-42 levels in brain tissues. Subsequently, the protein or gene levels of AAK1, AP-2, and Rab5 (an early endosome marker) were tested in each group. The cognitive function of Aβ1-42-induced mice was significantly declined compared to control group, and the deficits reached a peak on day 14, but partly recovered on day 30. Moreover, the level of Aβ1-42 detected with ELISA was highest on day 14, but reduced on day 30, paralleling the cognitive changes in the mice in our study. AAK1, AP-2, and Rab5 expression showed the same periodic variation as the changes in cognition. Thus, periodic variation in AAK1 expression is closely correlated to the decline in cognition, and AAK1 might be a suitable indicator for Alzheimer's disease.
Plasticity of population coding in primary sensory cortex.
Jun 19, 2018   Current Opinion In Neurobiology
LeMessurier AM, Feldman DE
Plasticity of population coding in primary sensory cortex.
Jun 19, 2018
Current Opinion In Neurobiology
That experience shapes sensory tuning in primary sensory cortex is well understood. But effective neural population codes depend on more than just sensory tuning. Recent population imaging and recording studies have characterized population codes in sensory cortex, and tracked how they change with sensory manipulations and training on perceptual learning tasks. These studies confirm sensory tuning changes, but also reveal other features of plasticity, including sensory gain modulation, restructuring of firing correlations, and differential routing of information to output pathways. Unexpectedly strong day-to-day variation exists in single-neuron sensory tuning, which stabilizes during learning. These are novel dimensions of plasticity in sensory cortex, which refine population codes during learning, but whose mechanisms are unknown.
Ultrastructural Characterization of Corticotropin-Releasing Factor and Neuropeptide Y in the Rat Locus Coeruleus: Anatomical Evidence for Putative Interactions.
Jun 19, 2018   Neuroscience
Theisen CC, Reyes BAS, Sabban EL, Van Bockstaele EJ
Ultrastructural Characterization of Corticotropin-Releasing Factor and Neuropeptide Y in the Rat Locus Coeruleus: Anatomical Evidence for Putative Interactions.
Jun 19, 2018
Neuroscience
As a neurochemical mediator of stress resilience, NPY has been shown to oppose excitatory effects of the pro-stress neuropeptide corticotropin-releasing factor (CRF). Previous studies have described the anatomical organization of NPY and CRF in the central nucleus of the amygdala, which sends CRF projections to the locus coeruleus (LC), activating LC norepinephrine release. However, the cellular substrates for interactions between NPY and CRF in the LC remain unknown. In this study, we investigated these anatomical substrates in the male rat LC, using immunocytochemistry, confocal microscopy, and immunoelectron microscopy to detect NPY and CRF, as well as CRF and Y1 or Y2 receptors (Y1R or Y2R). Immunofluorescence and electron microscopy revealed both co-localization of NPY and CRF in LC axon terminals, as well as separately labeled terminals, suggesting NPY and CRF may serve as co-transmitters in a subset of terminals. Semi-quantitative analysis showed that 32.4% of CRF-labeled terminals contained NPY, while 58.2% (152/261) of NPY-labeled terminals contained CRF. With respect to Y1R and CRF, dual immunoelectron microscopy showed that 23.3% (67/288) of CRF-labeled axon terminals directly contacted Y1R-labeled dendrites, while only 6.3% (18/288) of CRF-labeled axon terminals co-localized with Y1R. Dual immunoelectron microscopy also showed Y2R co-localized with 30.4% (103/339) CRF-labeled terminals, but only with 16.2% (55/339) of dendrites post-synaptic to CRF-labeled axon terminals in the LC. Taken together, these findings indicate multiple sites of interaction between CRF and NPY in the LC and suggest that conditions or drugs that modulate the NPY:CRF balance in the LC may promote stress resilience.
Abnormal Sleep Architecture and Hippocampal Circuit Dysfunction in a Mouse Model of Fragile X Syndrome.
Jun 19, 2018   Neuroscience
Boone CE, Davoudi H, Harrold JB, Foster DJ
Abnormal Sleep Architecture and Hippocampal Circuit Dysfunction in a Mouse Model of Fragile X Syndrome.
Jun 19, 2018
Neuroscience
Fragile X syndrome (FXS) is the most common heritable cause of intellectual disability and single-gene cause of autism spectrum disorder. The Fmr1 null mouse models much of the human disease including hyperarousal, sensory hypersensitivity, seizure activity, and hippocampus-dependent cognitive impairment. Sleep architecture is disorganized in FXS patients, but has not been examined in Fmr1 knockout (Fmr1-KO) mice. Hippocampal neural activity during sleep, which is implicated in memory processing, also remains uninvestigated in Fmr1-KO mice. We performed in vivo electrophysiological studies of freely behaving Fmr1-KO mice to assess neural activity, in the form of single-unit spiking and local field potential (LFP), within the hippocampal CA1 region during multiple differentiated sleep and wake states. Here, we demonstrate that Fmr1-KO mice exhibited a deficit in rapid eye movement sleep (REM) due to a reduction in the frequency of bouts of REM, consistent with sleep architecture abnormalities of FXS patients. Fmr1-KO CA1 pyramidal cells (CA1-PCs) were hyperactive in all sleep and wake states. Increased low gamma power in CA1 suggests that this hyperactivity was related to increased input to CA1 from CA3. By contrast, slower sharp-wave ripple events (SWRs) in Fmr1-KO mice exhibited longer event duration, slower oscillation frequency, with reduced CA1-PC firing rates during SWRs, yet the incidence rate of SWRs remained intact. These results suggest abnormal neuronal activity in the Fmr1-KO mouse during SWRs, and hyperactivity during other wake and sleep states, with likely adverse consequences for memory processes.
Lithium Posttreatment Alleviates Blood-Brain Barrier Injury After Intracerebral Hemorrhage in Rats.
Jun 10, 2018   Neuroscience
Li W, Li R, Zhao S, Jiang C, Liu Z, Tang X
Lithium Posttreatment Alleviates Blood-Brain Barrier Injury After Intracerebral Hemorrhage in Rats.
Jun 10, 2018
Neuroscience
Vasogenic cerebral edema formation after blood-brain barrier (BBB) damage aggravates the devastating consequences of intracerebral hemorrhage (ICH). The present study aims to probe into a therapeutic method on BBB preservation after ICH with a glycogen synthase kinase-3β (GSK-3β) inhibitor, lithium. Intrastriatal infusion of semicoagulated autologous whole blood or sham surgery was performed on male Sprague-Dawley (SD) rats (n = 208). Experimental animals received administration of 4,6-disubstitutedpyrrolo-pyrimidine (TWS119), lithium alone or in combination with a phosphatidylinositol 3-kinase inhibitor, wortmannin, after ICH. Behavioral tests, brain edema, and BBB permeability were determined at 24 and 72 h after surgery. Expressions of Akt, GSK-3β, β-catenin, claudin-1 and claudin-3 were evaluated via Western blots. Our results showed lithium alone posttreatment activated GSK-3β, therefore increasing active β-catenin and claudin-1 and claudin-3 expressions, which were accompanied with improved BBB integrity and ameliorated sensorimotor deficits and brain edema in ICH animals. We concluded that lithium alone reduced BBB damage after ICH, likely through regulating Akt/GSK-3β pathway and stabilizing β-catenin.
Digital Museum of Retinal Ganglion Cells with Dense Anatomy and Physiology.
May 18, 2018   Cell
Bae JA, Mu S, Kim JS, Turner NL, Tartavull I,   . . . . . .   , Sterling ALR, Park J, Briggman KL, Seung HS, yewirers
Digital Museum of Retinal Ganglion Cells with Dense Anatomy and Physiology.
May 18, 2018
Cell
When 3D electron microscopy and calcium imaging are used to investigate the structure and function of neural circuits, the resulting datasets pose new challenges of visualization and interpretation. Here, we present a new kind of digital resource that encompasses almost 400 ganglion cells from a single patch of mouse retina. An online "museum" provides a 3D interactive view of each cell's anatomy, as well as graphs of its visual responses. The resource reveals two aspects of the retina's inner plexiform layer: an arbor segregation principle governing structure along the light axis and a density conservation principle governing structure in the tangential plane. Structure is related to visual function; ganglion cells with arbors near the layer of ganglion cell somas are more sustained in their visual responses on average. Our methods are potentially applicable to dense maps of neuronal anatomy and physiology in other parts of the nervous system.
The Neuropeptide Tac2 Controls a Distributed Brain State Induced by Chronic Social Isolation Stress.
May 25, 2018   Cell
Zelikowsky M, Hui M, Karigo T, Choe A, Yang B, Blanco MR, Beadle K, Gradinaru V, Deverman BE, Anderson DJ
The Neuropeptide Tac2 Controls a Distributed Brain State Induced by Chronic Social Isolation Stress.
May 25, 2018
Cell
Chronic social isolation causes severe psychological effects in humans, but their neural bases remain poorly understood. 2 weeks (but not 24 hr) of social isolation stress (SIS) caused multiple behavioral changes in mice and induced brain-wide upregulation of the neuropeptide tachykinin 2 (Tac2)/neurokinin B (NkB). Systemic administration of an Nk3R antagonist prevented virtually all of the behavioral effects of chronic SIS. Conversely, enhancing NkB expression and release phenocopied SIS in group-housed mice, promoting aggression and converting stimulus-locked defensive behaviors to persistent responses. Multiplexed analysis of Tac2/NkB function in multiple brain areas revealed dissociable, region-specific requirements for both the peptide and its receptor in different SIS-induced behavioral changes. Thus, Tac2 coordinates a pleiotropic brain state caused by SIS via a distributed mode of action. These data reveal the profound effects of prolonged social isolation on brain chemistry and function and suggest potential new therapeutic applications for Nk3R antagonists.
Social Isolation Co-opts Fear and Aggression Circuits.
May 18, 2018   Cell
Rodriguez-Romaguera J, Stuber GD
Social Isolation Co-opts Fear and Aggression Circuits.
May 18, 2018
Cell
Social isolation is a stressful condition that often leads to maladaptive behaviors. In this issue of Cell, Zelikowsky et al. find that chronic social isolation stress triggers an increase in neuronal tachykinin signaling across distinct brain regions that mediate fear and aggression, elucidating the neural basis of these maladaptive responses.
Potassium and sodium microdomains in thin astroglial processes: A computational model study.
Jun 18, 2018   PLoS Computational Biology
Breslin K, Wade JJ, Wong-Lin K, Harkin J, Flanagan B, Van Zalinge H, Hall S, Walker M, Verkhratsky A, McDaid L
Potassium and sodium microdomains in thin astroglial processes: A computational model study.
Jun 18, 2018
PLoS Computational Biology
A biophysical model that captures molecular homeostatic control of ions at the perisynaptic cradle (PsC) is of fundamental importance for understanding the interplay between astroglial and neuronal compartments. In this paper, we develop a multi-compartmental mathematical model which proposes a novel mechanism whereby the flow of cations in thin processes is restricted due to negatively charged membrane lipids which result in the formation of deep potential wells near the dipole heads. These wells restrict the flow of cations to "hopping" between adjacent wells as they transverse the process, and this surface retention of cations will be shown to give rise to the formation of potassium (K+) and sodium (Na+) microdomains at the PsC. We further propose that a K+ microdomain formed at the PsC, provides the driving force for the return of K+ to the extracellular space for uptake by the neurone, thereby preventing K+ undershoot. A slow decay of Na+ was also observed in our simulation after a period of glutamate stimulation which is in strong agreement with experimental observations. The pathological implications of microdomain formation during neuronal excitation are also discussed.
Preservation of electrophysiological functional connectivity after partial corpus callosotomy: case report.
May 18, 2018   Journal Of Neurosurgery. Pediatrics
Casimo K, Grassia F, Poliachik SL, Novotny E, Poliakov A, Ojemann JG
Preservation of electrophysiological functional connectivity after partial corpus callosotomy: case report.
May 18, 2018
Journal Of Neurosurgery. Pediatrics
Prior studies of functional connectivity following callosotomy have disagreed in the observed effects on interhemispheric functional connectivity. These connectivity studies, in multiple electrophysiological methods and functional MRI, have found conflicting reductions in connectivity or patterns resembling typical individuals. The authors examined a case of partial anterior corpus callosum connection, where pairs of bilateral electrocorticographic electrodes had been placed over homologous regions in the left and right hemispheres. They sorted electrode pairs by whether their direct corpus callosum connection had been disconnected or preserved using diffusion tensor imaging and native anatomical MRI, and they estimated functional connectivity between pairs of electrodes over homologous regions using phase-locking value. They found no significant differences in any frequency band between pairs of electrodes that had their corpus callosum connection disconnected and those that had an intact connection. The authors' results may imply that the corpus callosum is not an obligatory mediator of connectivity between homologous sites in opposite hemispheres. This interhemispheric synchronization may also be linked to disruption of seizure activity.
Fluorescence resonance energy transfer (FRET) based nanoparticles composed of AIE luminogens and NIR dyes with enhanced three-photon near-infrared emission for in vivo brain angiography.
Jun 01, 2018   Nanoscale
Liu W, Wang Y, Han X, Lu P, Zhu L, Sun C, Qian J, He S
Fluorescence resonance energy transfer (FRET) based nanoparticles composed of AIE luminogens and NIR dyes with enhanced three-photon near-infrared emission for in vivo brain angiography.
Jun 01, 2018
Nanoscale
Near-infrared (NIR) fluorescence is very important for high-contrast biological imaging of high-scattering tissues such as brain tissue. Unfortunately, commercial NIR dyes are excited usually by visible light, and their multi-photon absorption (MPA) cross-sections are small. Here, we design new co-encapsulated NIR nanoparticles (NPs) with a large three-photon (3PA) absorption cross-section. A form of aggregation-induced emission (AIE) luminogen (AIEgen), 2,3-bis(4'-(diphenylamino)-[1,1'-biphenyl]-4-yl) fumaronitrile (TPATCN), is introduced as the donor, and a form of NIR dye, silicon 2,3-naphthalocyanine bis-(trihexylsilyloxide) (NIR775), is adopted as the acceptor. Under the excitation of a 1550 nm fs laser, TPATCN-NIR775 NPs demonstrated a bright three-photon fluorescence centered at 785 nm. The energy transfer efficiency of the TPATCN-NIR775 NPs was calculated to be as high as 90%, which could be attributed to the good spectral overlap between the emission of TPATCN and the absorption of NIR775. By injection with TPATCN-NIR775 NPs, a vivid 3D reconstruction of mouse brain vasculature was obtained with even small blood vessels clearly visualized. The design strategy used for the co-encapsulated AIE-NIR NPs would be helpful in synthesizing more NIR probes for deep-tissue biological imaging in the future.
AP180 N-Terminal Homology (ANTH) and Epsin N-Terminal Homology (ENTH) Domains: Physiological Functions and Involvement in Disease.
May 18, 2018   Advances In Experimental Medicine And Biology
Takatori S, Tomita T
AP180 N-Terminal Homology (ANTH) and Epsin N-Terminal Homology (ENTH) Domains: Physiological Functions and Involvement in Disease.
May 18, 2018
Advances In Experimental Medicine And Biology
The AP180 N-terminal homology (ANTH) and Epsin N-terminal homology (ENTH) domains are crucially involved in membrane budding processes. All the ANTH/ENTH-containing proteins share the phosphoinositide-binding activity and can interact with clathrin or its related proteins via multiple binding motifs. Their function also include promotion of clathrin assembly, induction of membrane curvature, and recruitment of various effector proteins, such as those involved in membrane fission. Furthermore, they play a role in the sorting of specific cargo proteins, thereby enabling the cargos to be accurately transported and function at their appropriate locations. As the structural bases underlying these functions are clarified, contrary to their apparent similarity, the mechanisms by which these proteins recognize lipids and proteins have unexpectedly been found to differ from each other. In addition, studies using knockout mice have suggested that their physiological roles may be more complicated than merely supporting membrane budding processes. In this chapter, we review the current knowledge on the biochemical features of ANTH/ENTH domains, their functions predicted from the phenotypes of animals deficient in these domain-containing proteins, and recent findings on the structural basis enabling specific recognition of their ligands. We also discuss the association of these domains with human diseases. Here we focus on CALM, a protein containing an ANTH domain, which is implicated in the pathogenesis of blood cancers and Alzheimer disease, and discuss how alteration of CALM function is involved in these diseases.
The relative resistance of children to sepsis mortality: from pathways to drug candidates.
Jun 07, 2018   Molecular Systems Biology
Joachim RB, Altschuler GM, Hutchinson JN, Wong HR, Hide WA, Kobzik L
The relative resistance of children to sepsis mortality: from pathways to drug candidates.
Jun 07, 2018
Molecular Systems Biology
Attempts to develop drugs that address sepsis based on leads developed in animal models have failed. We sought to identify leads based on human data by exploiting a natural experiment: the relative resistance of children to mortality from severe infections and sepsis. Using public datasets, we identified key differences in pathway activity (Pathprint) in blood transcriptome profiles of septic adults and children. To find drugs that could promote beneficial (child) pathways or inhibit harmful (adult) ones, we built an in silico pathway drug network (PDN) using expression correlation between drug, disease, and pathway gene signatures across 58,475 microarrays. Specific pathway clusters from children or adults were assessed for correlation with drug-based signatures. Validation by literature curation and by direct testing in an endotoxemia model of murine sepsis of the most correlated drug candidates demonstrated that the Pathprint-PDN methodology is more effective at generating positive drug leads than gene-level methods (e.g., CMap). Pathway-centric Pathprint-PDN is a powerful new way to identify drug candidates for intervention against sepsis and provides direct insight into pathways that may determine survival.
Inflammation in stroke: the role of cholinergic, purinergic and glutamatergic signaling.
May 20, 2018   Therapeutic Advances In Neurological Disorders
Martín A, Domercq M, Matute C
Inflammation in stroke: the role of cholinergic, purinergic and glutamatergic signaling.
May 20, 2018
Therapeutic Advances In Neurological Disorders
The inflammatory response is a major factor in stroke pathophysiology and contributes to secondary neuronal damage in both acute and chronic stages of the ischemic injury. Recent work in experimental cerebral ischemia has demonstrated the involvement of neurotransmitter signaling in the modulation of neuroinflammation. The present review discusses recent findings on the therapeutic potential and diagnostic perspectives of cholinergic, purinergic and glutamatergic receptors and transporters in experimental stroke. It provides evidence of the role of neurotransmission signaling as a promising inflammatory biomarker in stroke. Finally, recent molecular imaging studies using positron emission tomography of cholinergic receptors and glutamatergic transporters are outlined along with their potential as novel anti-inflammatory therapy to reduce the outcome of cerebral ischemia.
Anatomical Inputs From the Sensory and Value Structures to the Tail of the Rat Striatum.
May 20, 2018   Frontiers In Neuroanatomy
Jiang H, Kim HF
Anatomical Inputs From the Sensory and Value Structures to the Tail of the Rat Striatum.
May 20, 2018
Frontiers In Neuroanatomy
The caudal region of the rodent striatum, called the tail of the striatum (TS), is a relatively small area but might have a distinct function from other striatal subregions. Recent primate studies showed that this part of the striatum has a unique function in encoding long-term value memory of visual objects for habitual behavior. This function might be due to its specific connectivity. We identified inputs to the rat TS and compared those with inputs to the dorsomedial striatum (DMS) in the same animals. The TS directly received anatomical inputs from both sensory structures and value-coding regions, but the DMS did not. First, inputs from the sensory cortex and sensory thalamus to the TS were found; visual, auditory, somatosensory and gustatory cortex and thalamus projected to the TS but not to the DMS. Second, two value systems innervated the TS; dopamine and serotonin neurons in the lateral part of the substantia nigra pars compacta (SNc) and dorsal raphe nucleus projected to the TS, respectively. The DMS received inputs from the separate group of dopamine neurons in the medial part of the SNc. In addition, learning-related regions of the limbic system innervated the TS; the temporal areas and the basolateral amygdala selectively innervated the TS, but not the DMS. Our data showed that both sensory and value-processing structures innervated the TS, suggesting its plausible role in value-guided sensory-motor association for habitual behavior.
An approach to monitoring home-cage behavior in mice that facilitates data sharing.
May 21, 2018   Nature Protocols Add nature.com free-link Cancel
Balzani E, Falappa M, Balci F, Tucci V
An approach to monitoring home-cage behavior in mice that facilitates data sharing.
May 21, 2018
Nature Protocols
Genetically modified mice are used as models for a variety of human behavioral conditions. However, behavioral phenotyping can be a major bottleneck in mouse genetics because many of the classic protocols are too long and/or are vulnerable to unaccountable sources of variance, leading to inconsistent results between centers. We developed a home-cage approach using a Chora feeder that is controlled by-and sends data to-software. In this approach, mice are tested in the standard cages in which they are held for husbandry, which removes confounding variables such as the stress induced by out-of-cage testing. This system increases the throughput of data gathering from individual animals and facilitates data mining by offering new opportunities for multimodal data comparisons. In this protocol, we use a simple work-for-food testing strategy as an example application, but the approach can be adapted for other experiments looking at, e.g., attention, decision-making or memory. The spontaneous behavioral activity of mice in performing the behavioral task can be monitored 24 h a day for several days, providing an integrated assessment of the circadian profiles of different behaviors. We developed a Python-based open-source analytical platform (Phenopy) that is accessible to scientists with no programming background and can be used to design and control such experiments, as well as to collect and share data. This approach is suitable for large-scale studies involving multiple laboratories.
Synaptic building blocks.
Jun 19, 2018   Nature Reviews. Neuroscience
Whalley K
Synaptic building blocks.
Jun 19, 2018
Nature Reviews. Neuroscience
Ocular Counter Rolling in Astronauts After Short- and Long-Duration Spaceflight.
May 25, 2018   Scientific Reports
Reschke MF, Wood SJ, Clément G
Ocular Counter Rolling in Astronauts After Short- and Long-Duration Spaceflight.
May 25, 2018
Scientific Reports
Ocular counter-rolling (OCR) is a reflex generated by the activation of the gravity sensors in the inner ear that stabilizes gaze and posture during head tilt. We compared the OCR measures that were obtained in 6 astronauts before, during, and after a spaceflight lasting 4-6 days with the OCR measures obtained from 6 astronauts before and after a spaceflight lasting 4-9 months. OCR in the short-duration fliers was measured using the afterimage method during head tilt at 15°, 30°, and 45°. OCR in the long-duration fliers was measured using video-oculography during whole body tilt at 25°. A control group of 7 subjects was used to compare OCR measures during head tilt and whole body tilt. No OCR occurred during head tilt in microgravity, and the response returned to normal within 2 hours of return from short-duration spaceflight. However, the amplitude of OCR was reduced for several days after return from long-duration spaceflight. This decrease in amplitude was not accompanied by changes in the asymmetry of OCR between right and left head tilt. These results indicate that the adaptation  of otolith-driven reflexes to microgravity is a long-duration process.
Melanopsin-mediated pupil function is impaired in Parkinson's disease.
May 22, 2018   Scientific Reports
Joyce DS, Feigl B, Kerr G, Roeder L, Zele AJ
Melanopsin-mediated pupil function is impaired in Parkinson's disease.
May 22, 2018
Scientific Reports
Parkinson's disease (PD) is characterised by non-motor symptoms including sleep and circadian disruption. Melanopsin-expressing intrinsically photosensitive Retinal Ganglion Cells (ipRGC) transmit light signals to brain areas controlling circadian rhythms and the pupil light reflex. To determine if non-motor symptoms observed in PD are linked to ipRGC dysfunction, we evaluated melanopsin and rod/cone contributions to the pupil response in medicated participants with PD (n = 17) and controls (n = 12). Autonomic tone was evaluated by measuring pupillary unrest in darkness. In the PD group, there is evidence for an attenuated post-illumination pupil response (PIPR) amplitude and reduced pupil constriction amplitude, and PIPR amplitudes did not correlate with measures of sleep quality, retinal nerve fibre layer thickness, disease severity, or medication dosage. Both groups exhibited similar pupillary unrest. We show that melanopsin- and the rod/cone-photoreceptor contributions to the pupil control pathway are impaired in people with early-stage PD who have no clinically observable ophthalmic abnormalities. Given that ipRGCs project to brain targets involved in arousal, sleep and circadian rhythms, ipRGC dysfunction may underpin some of the non-motor symptoms observed in PD.
Sensory representation of an auditory cued tactile stimulus in the posterior parietal cortex of the mouse.
May 22, 2018   Scientific Reports
Mohan H, Gallero-Salas Y, Carta S, Sacramento J, Laurenczy B, Sumanovski LT, de Kock CPJ, Helmchen F, Sachidhanandam S
Sensory representation of an auditory cued tactile stimulus in the posterior parietal cortex of the mouse.
May 22, 2018
Scientific Reports
Sensory association cortices receive diverse inputs with their role in representing and integrating multi-sensory content remaining unclear. Here we examined the neuronal correlates of an auditory-tactile stimulus sequence in the posterior parietal cortex (PPC) using 2-photon calcium imaging in awake mice. We find that neuronal subpopulations in layer 2/3 of PPC reliably represent texture-touch events, in addition to auditory cues that presage the incoming tactile stimulus. Notably, altering the flow of sensory events through omission of the cued texture touch elicited large responses in a subset of neurons hardly responsive to or even inhibited by the tactile stimuli. Hence, PPC neurons were able to discriminate not only tactile stimulus features (i.e., texture graininess) but also between the presence and omission of the texture stimulus. Whereas some of the neurons responsive to texture omission were driven by looming-like auditory sounds others became recruited only with tactile sensory experience. These findings indicate that layer 2/3 neuronal populations in PPC potentially encode correlates of expectancy in addition to auditory and tactile stimuli.
Elucidating the genetic architecture of reproductive ageing in the Japanese population.
May 23, 2018   Nature Communications
Horikoshi M, Day FR, Akiyama M, Hirata M, Kamatani Y,   . . . . . .   , Ojeda SR, Lomniczi A, Kubo M, Ong KK, Perry JRB
Elucidating the genetic architecture of reproductive ageing in the Japanese population.
May 23, 2018
Nature Communications
Population studies elucidating the genetic architecture of reproductive ageing have been largely limited to European ancestries, restricting the generalizability of the findings and overlooking possible key genes poorly captured by common European genetic variation. Here, we report 26 loci (all P 
miR126-5p Downregulation Facilitates Axon Degeneration and NMJ Disruption via a Non-Cell-Autonomous Mechanism in ALS.
Jun 14, 2018   The Journal Of Neuroscience : The Official Journal Of The Society For Neuroscience
Maimon R, Ionescu A, Bonnie A, Sweetat S, Wald-Altman S, Inbar S, Gradus T, Trotti D, Weil M, Behar O, Perlson E
miR126-5p Downregulation Facilitates Axon Degeneration and NMJ Disruption via a Non-Cell-Autonomous Mechanism in ALS.
Jun 14, 2018
The Journal Of Neuroscience : The Official Journal Of The Society For Neuroscience
Axon degeneration and disruption of neuromuscular junctions (NMJs) are key events in amyotrophic lateral sclerosis (ALS) pathology. Although the disease's etiology is not fully understood, it is thought to involve a non-cell-autonomous mechanism and alterations in RNA metabolism. Here, we identified reduced levels of miR126-5p in presymptomatic ALS male mice models, and an increase in its targets: axon destabilizing Type 3 Semaphorins and their coreceptor Neuropilins. Using compartmentalized in vitro cocultures, we demonstrated that myocytes expressing diverse ALS-causing mutations promote axon degeneration and NMJ dysfunction, which were inhibited by applying Neuropilin1 blocking antibody. Finally, overexpressing miR126-5p is sufficient to transiently rescue axon degeneration and NMJ disruption both in vitro and in vivo Thus, we demonstrate a novel mechanism underlying ALS pathology, in which alterations in miR126-5p facilitate a non-cell-autonomous mechanism of motor neuron degeneration in ALS.SIGNIFICANCE STATEMENT Despite some progress, currently no effective treatment is available for amyotrophic lateral sclerosis (ALS). We suggest a novel regulatory role for miR126-5p in ALS and demonstrate, for the first time, a mechanism by which alterations in miR126-5p contribute to axon degeneration and NMJ disruption observed in ALS. We show that miR126-5p is altered in ALS models and that it can modulate Sema3 and NRP protein expression. Furthermore, NRP1 elevations in motor neurons and muscle secretion of Sema3A contribute to axon degeneration and NMJ disruption in ALS. Finally, overexpressing miR126-5p is sufficient to transiently rescue NMJ disruption and axon degeneration both in vitro and in vivo.
A Critical Neurodevelopmental Role for L-Type Voltage-Gated Calcium Channels in Neurite Extension and Radial Migration.
Jun 14, 2018   The Journal Of Neuroscience : The Official Journal Of The Society For Neuroscience
Kamijo S, Ishii Y, Horigane SI, Suzuki K, Ohkura M, Nakai J, Fujii H, Takemoto-Kimura S, Bito H
A Critical Neurodevelopmental Role for L-Type Voltage-Gated Calcium Channels in Neurite Extension and Radial Migration.
Jun 14, 2018
The Journal Of Neuroscience : The Official Journal Of The Society For Neuroscience
Despite many association studies linking gene polymorphisms and mutations of L-type voltage-gated Ca2+ channels (VGCCs) in neurodevelopmental disorders such as autism and schizophrenia, the roles of specific L-type VGCC during brain development remain unclear. Calcium signaling has been shown to be essential for neurodevelopmental processes such as sculpting of neurites, functional wiring, and fine tuning of growing networks. To investigate this relationship, we performed submembraneous calcium imaging using a membrane-tethered genetically encoded calcium indicator (GECI) Lck-G-CaMP7. We successfully recorded spontaneous regenerative calcium transients (SRCaTs) in developing mouse excitatory cortical neurons prepared from both sexes before synapse formation. SRCaTs originated locally in immature neurites independently of somatic calcium rises and were significantly more elevated in the axons than in dendrites. SRCaTs were not blocked by tetrodoxin, a Na+ channel blocker, but were strongly inhibited by hyperpolarization, suggesting a voltage-dependent source. Pharmacological and genetic manipulations revealed the critical importance of the Cav1.2 (CACNA1C) pore-forming subunit of L-type VGCCs, which were indeed expressed in immature mouse brains. Consistently, knocking out Cav1.2 resulted in significant alterations of neurite outgrowth. Furthermore, expression of a gain-of-function Cav1.2 mutant found in Timothy syndrome, an autosomal dominant multisystem disorder exhibiting syndromic autism, resulted in impaired radial migration of layer 2/3 excitatory neurons, whereas postnatal abrogation of Cav1.2 enhancement could rescue cortical malformation. Together, these lines of evidence suggest a critical role for spontaneous opening of L-type VGCCs in neural development and corticogenesis and indicate that L-type VGCCs might constitute a perinatal therapeutic target for neuropsychiatric calciochannelopathies.SIGNIFICANCE STATEMENT Despite many association studies linking gene polymorphisms and mutations of L-type voltage-gated Ca2+ channels (VGCCs) in neurodevelopmental disorders such as autism and schizophrenia, the roles of specific L-type VGCCs during brain development remain unclear. We here combined the latest Ca2+ indicator technology, quantitative pharmacology, and in utero electroporation and found a hitherto unsuspected role for L-type VGCCs in determining the Ca2+ signaling landscape of mouse immature neurons. We found that malfunctional L-type VGCCs in immature neurons before birth might cause errors in neuritic growth and cortical migration. Interestingly, the retarded corticogenesis phenotype was rescued by postnatal correction of L-type VGCC signal aberration. These findings suggest that L-type VGCCs might constitute a perinatal therapeutic target for neurodevelopment-associated psychiatric disorders.
Development and validation of the Chinese Version of the Adult Epilepsy Self-Management Scale (C-ESMS) in Western China.
May 30, 2018   Epilepsy Research
Xiao X, Si Y, Mo Q, Liu Y, Li C,   . . . . . .   , Wu D, He Q, Hu M, Zhang C, Sun H
Development and validation of the Chinese Version of the Adult Epilepsy Self-Management Scale (C-ESMS) in Western China.
May 30, 2018
Epilepsy Research
PURPOSE: To develop and validate the Epilepsy Self-Management Scale (ESMS) for Chinese persons with epilepsy (PWE). METHODS: On the basis of ESMS, the standard translation procedure was used to set up the Chinese version of the ESMS (C-ESMS). A consecutive cohort of PWE admitted in Sichuan Provincial People's Hospital were recruited randomly from May 2017 to December 2017 and required to complete the C-ESMS. Project analysis was employed to test the homogeneity of each dimension. Content validity was evaluated by experts. Exploratory factor analysis and confirmatory factor analysis (CFA) were applied to assess the validity. Cronbach's alpha was used to evaluate the reliability. RESULTS: Of the 400 completed C-ESMS forms, only 394 (98.5%) were suitable for analysis. The C-ESMS included 34 items and five dimensions, after removing four and modifying three items. The correlation coefficient of all 34 items was greater than 0.4. Each item level (I-CVI) and scale level CVI (S-CVI) was equal to 1. Five factors were extracted and together they explained 51.24% of the data's variance. The factor load of each item was 0.446-0.843. The CFA showed that CMIN/DF was 1.325, goodness of fit was 0.835, comparative fit index was 0.921, and root mean square error of approximation was 0.041. The total Cronbach's alpha of the scale was 0.848, and Cronbach's alpha in each dimension was 0.784-0.845. CONCLUSION: The C-ESMS exhibited good reliability and validity for adult PWE in western China.

The link you entered does not seem to be valid

Please make sure the link points to nature.com contains a valid shared_access_token

Downloading PDF to your library...

Uploading PDF...

PDF uploading

Delete tag: