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Articles 1 - 11 of 11
Full-Text Articles in Neurosciences
Epigenetic Suppression Of Hippocampal Calbindin-D28k By Δfosb Drives Seizure-Related Cognitive Deficits., Jason C. You, Kavitha Muralidharan, Jin W. Park, Iraklis Petrof, Mark S. Pyfer, Brian F. Corbett, John J. Lafrancois, Yi Zheng, Xiaohong Zhang, Carrie A. Mohila, Daniel Yoshor, Robert A. Rissman, Eric J. Nestler, Helen E. Scharfman, Jeannie Chin
Epigenetic Suppression Of Hippocampal Calbindin-D28k By Δfosb Drives Seizure-Related Cognitive Deficits., Jason C. You, Kavitha Muralidharan, Jin W. Park, Iraklis Petrof, Mark S. Pyfer, Brian F. Corbett, John J. Lafrancois, Yi Zheng, Xiaohong Zhang, Carrie A. Mohila, Daniel Yoshor, Robert A. Rissman, Eric J. Nestler, Helen E. Scharfman, Jeannie Chin
Department of Neuroscience Faculty Papers
The calcium-binding protein calbindin-D28k is critical for hippocampal function and cognition, but its expression is markedly decreased in various neurological disorders associated with epileptiform activity and seizures. In Alzheimer's disease (AD) and epilepsy, both of which are accompanied by recurrent seizures, the severity of cognitive deficits reflects the degree of calbindin reduction in the hippocampal dentate gyrus (DG). However, despite the importance of calbindin in both neuronal physiology and pathology, the regulatory mechanisms that control its expression in the hippocampus are poorly understood. Here we report an epigenetic mechanism through which seizures chronically suppress hippocampal calbindin expression and impair cognition. …
Rabies Screen Reveals Gpe Control Of Cocaine-Triggered Plasticity., Kevin T. Beier, Christina K. Kim, Paul Hoerbelt, Lin Wai Hung, Boris D. Heifets, Katherine E. Deloach, Timothy J. Mosca, Sophie Neuner, Karl Deisseroth, Liqun Luo, Robert C. Malenka
Rabies Screen Reveals Gpe Control Of Cocaine-Triggered Plasticity., Kevin T. Beier, Christina K. Kim, Paul Hoerbelt, Lin Wai Hung, Boris D. Heifets, Katherine E. Deloach, Timothy J. Mosca, Sophie Neuner, Karl Deisseroth, Liqun Luo, Robert C. Malenka
Department of Neuroscience Faculty Papers
Identification of neural circuit changes that contribute to behavioural plasticity has routinely been conducted on candidate circuits that were preselected on the basis of previous results. Here we present an unbiased method for identifying experience-triggered circuit-level changes in neuronal ensembles in mice. Using rabies virus monosynaptic tracing, we mapped cocaine-induced global changes in inputs onto neurons in the ventral tegmental area. Cocaine increased rabies-labelled inputs from the globus pallidus externus (GPe), a basal ganglia nucleus not previously known to participate in behavioural plasticity triggered by drugs of abuse. We demonstrated that cocaine increased GPe neuron activity, which accounted for the …
Calcineurin Dysregulation Underlies Spinal Cord Injury-Induced K(+) Channel Dysfunction In Drg Neurons., Benjamin M. Zemel, Tanziyah Muqeem, Eric V. Brown, Miguel Goulão, Mark W Urban, Stephen R. Tymanskyj, Angelo C. Lepore, Manuel Covarrubias
Calcineurin Dysregulation Underlies Spinal Cord Injury-Induced K(+) Channel Dysfunction In Drg Neurons., Benjamin M. Zemel, Tanziyah Muqeem, Eric V. Brown, Miguel Goulão, Mark W Urban, Stephen R. Tymanskyj, Angelo C. Lepore, Manuel Covarrubias
Department of Neuroscience Faculty Papers
Dysfunction of the fast-inactivating Kv3.4 potassium current in dorsal root ganglion (DRG) neurons contributes to the hyperexcitability associated with persistent pain induced by spinal cord injury (SCI). However, the underlying mechanism is not known. In light of our previous work demonstrating modulation of the Kv3.4 channel by phosphorylation, we investigated the role of the phosphatase calcineurin (CaN) using electrophysiological, molecular, and imaging approaches in adult female Sprague Dawley rats. Pharmacological inhibition of CaN in small-diameter DRG neurons slowed repolarization of the somatic action potential (AP) and attenuated the Kv3.4 current. Attenuated Kv3.4 currents also exhibited slowed inactivation. We observed similar …
Δfosb Regulates Gene Expression And Cognitive Dysfunction In A Mouse Model Of Alzheimer's Disease., Brian F Corbett, Jason C You, Xiaohong Zhang, Mark S Pyfer, Umberto Tosi, Daniel M Iascone, Iraklis Petrof, Anupam Hazra, Chia-Hsuan Fu, Gabriel S Stephens, Annie Ashok, Suzan Aschmies, Lijuan Zhao, Eric J Nestler, Jeannie Chin
Δfosb Regulates Gene Expression And Cognitive Dysfunction In A Mouse Model Of Alzheimer's Disease., Brian F Corbett, Jason C You, Xiaohong Zhang, Mark S Pyfer, Umberto Tosi, Daniel M Iascone, Iraklis Petrof, Anupam Hazra, Chia-Hsuan Fu, Gabriel S Stephens, Annie Ashok, Suzan Aschmies, Lijuan Zhao, Eric J Nestler, Jeannie Chin
Department of Neuroscience Faculty Papers
Alzheimer's disease (AD) is characterized by cognitive decline and 5- to 10-fold increased seizure incidence. How seizures contribute to cognitive decline in AD or other disorders is unclear. We show that spontaneous seizures increase expression of ΔFosB, a highly stable Fos-family transcription factor, in the hippocampus of an AD mouse model. ΔFosB suppressed expression of the immediate early gene c-Fos, which is critical for plasticity and cognition, by binding its promoter and triggering histone deacetylation. Acute histone deacetylase (HDAC) inhibition or inhibition of ΔFosB activity restored c-Fos induction and improved cognition in AD mice. Administration of seizure-inducing agents to nontransgenic …
A Role For Ankyring In Maturation And Maintenance Of The Nodes Of Ranvier., Benjamin Yang, Bridget M. Curran, Stephen R. Tymanskyj
A Role For Ankyring In Maturation And Maintenance Of The Nodes Of Ranvier., Benjamin Yang, Bridget M. Curran, Stephen R. Tymanskyj
Department of Neuroscience Faculty Papers
No abstract provided.
Presynaptic Lrp4 Promotes Synapse Number And Function Of Excitatory Cns Neurons., Timothy J. Mosca, David J. Luginbuhl, Irving E. Wang, Liqun Luo
Presynaptic Lrp4 Promotes Synapse Number And Function Of Excitatory Cns Neurons., Timothy J. Mosca, David J. Luginbuhl, Irving E. Wang, Liqun Luo
Department of Neuroscience Faculty Papers
Precise coordination of synaptic connections ensures proper information flow within circuits. The activity of presynaptic organizing molecules signaling to downstream pathways is essential for such coordination, though such entities remain incompletely known. We show that LRP4, a conserved transmembrane protein known for its postsynaptic roles, functions presynaptically as an organizing molecule. In the Drosophila brain, LRP4 localizes to the nerve terminals at or near active zones. Loss of presynaptic LRP4 reduces excitatory (not inhibitory) synapse number, impairs active zone architecture, and abolishes olfactory attraction - the latter of which can be suppressed by reducing presynaptic GABAB receptors. LRP4 overexpression increases …
Identification Of Octopaminergic Neurons That Modulate Sleep Suppression By Male Sex Drive., Daniel R. Machado, Dinis Afonso, Alexandra R. Kenny, Arzu Öztürk-Çolak, Emilia H. Moscato, Benjamin Mainwaring, Matthew Kayser, Kyunghee Koh
Identification Of Octopaminergic Neurons That Modulate Sleep Suppression By Male Sex Drive., Daniel R. Machado, Dinis Afonso, Alexandra R. Kenny, Arzu Öztürk-Çolak, Emilia H. Moscato, Benjamin Mainwaring, Matthew Kayser, Kyunghee Koh
Department of Neuroscience Faculty Papers
Molecular and circuit mechanisms for balancing competing drives are not well understood. While circadian and homeostatic mechanisms generally ensure sufficient sleep at night, other pressing needs can overcome sleep drive. Here, we demonstrate that the balance between sleep and sex drives determines whether male flies sleep or court, and identify a subset of octopaminergic neurons (MS1) that regulate sleep specifically in males. When MS1 neurons are activated, isolated males sleep less, and when MS1 neurons are silenced, the normal male sleep suppression in female presence is attenuated and mating behavior is impaired. MS1 neurons do not express the sexually dimorphic …
Map7 Regulates Axon Collateral Branch Development In Dorsal Root Ganglion Neurons., Stephen R Tymanskyj, Benjamin Yang, Aditi Falnikar, Angelo C Lepore, Le Ma
Map7 Regulates Axon Collateral Branch Development In Dorsal Root Ganglion Neurons., Stephen R Tymanskyj, Benjamin Yang, Aditi Falnikar, Angelo C Lepore, Le Ma
Department of Neuroscience Faculty Papers
Collateral branches from axons are key components of functional neural circuits that allow neurons to connect with multiple synaptic targets. Like axon growth and guidance, formation of collateral branches depends on the regulation of microtubules, but how such regulation is coordinated to ensure proper circuit development is not known. Based on microarray analysis, we have identified a role for microtubule-associated protein 7 (MAP7) during collateral branch development of dorsal root ganglion (DRG) sensory neurons. We show that MAP7 is expressed at the onset of collateral branch formation. Perturbation of its expression by overexpression or shRNA knockdown alters axon branching in …
Regulation Of Sleep Plasticity By A Thermo-Sensitive Circuit In Drosophila., Angelique Lamaze, Arzu Öztürk-Çolak, Robin Fischer, Nicolai Peschel, Kyunghee Koh, James E.C. Jepson
Regulation Of Sleep Plasticity By A Thermo-Sensitive Circuit In Drosophila., Angelique Lamaze, Arzu Öztürk-Çolak, Robin Fischer, Nicolai Peschel, Kyunghee Koh, James E.C. Jepson
Department of Neuroscience Faculty Papers
Sleep is a highly conserved and essential behaviour in many species, including the fruit fly Drosophila melanogaster. In the wild, sensory signalling encoding environmental information must be integrated with sleep drive to ensure that sleep is not initiated during detrimental conditions. However, the molecular and circuit mechanisms by which sleep timing is modulated by the environment are unclear. Here we introduce a novel behavioural paradigm to study this issue. We show that in male fruit flies, onset of the daytime siesta is delayed by ambient temperatures above 29 °C. We term this effect Prolonged Morning Wakefulness (PMW). We show that …
Pathogenic Determinants And Mechanisms Of Als/Ftd Linked To Hexanucleotide Repeat Expansions In The C9orf72 Gene., Xinmei Wen, Thomas Westergard, Piera Pasinelli, Davide Trotti
Pathogenic Determinants And Mechanisms Of Als/Ftd Linked To Hexanucleotide Repeat Expansions In The C9orf72 Gene., Xinmei Wen, Thomas Westergard, Piera Pasinelli, Davide Trotti
Department of Neuroscience Faculty Papers
Amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD) are two apparently distinct neurodegenerative diseases, the former characterized by selective loss of motor neurons in the brain and spinal cord and the latter characterized by selective atrophy of frontal and temporal lobes. Over the years, however, growing evidence from clinical, pathological and genetic findings has suggested that ALS and FTD belong to the same clinic-pathological spectrum disorder. This concept has been further supported by the identification of the most common genetic cause for both diseases, an aberrantly expanded hexanucleotide repeat GGGGCC/ CCCCGG sequence located in a non-coding region of the gene …
Harnessing The Power Of Cell Transplantation To Target Respiratory Dysfunction Following Spinal Cord Injury., Brittany A. Charsar, Mark W. Urban, Angelo C. Lepore
Harnessing The Power Of Cell Transplantation To Target Respiratory Dysfunction Following Spinal Cord Injury., Brittany A. Charsar, Mark W. Urban, Angelo C. Lepore
Department of Neuroscience Faculty Papers
The therapeutic benefit of cell transplantation has been assessed in a host of central nervous system (CNS) diseases, including disorders of the spinal cord such as traumatic spinal cord injury (SCI). The promise of cell transplantation to preserve and/or restore normal function can be aimed at a variety of therapeutic mechanisms, including replacement of lost or damaged CNS cell types, promotion of axonal regeneration or sprouting, neuroprotection, immune response modulation, and delivery of gene products such as neurotrophic factors, amongst other possibilities. Despite significant work in the field of transplantation in models of SCI, limited attention has been directed at …