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Articles 781 - 810 of 909
Full-Text Articles in Molecular and Cellular Neuroscience
Modulation Of Glutamate-Mediated Neuronal Cell Death By Neurosteroids, Benjamin J. Phelps
Modulation Of Glutamate-Mediated Neuronal Cell Death By Neurosteroids, Benjamin J. Phelps
Undergraduate Theses and Capstone Projects
Traumatic brain injury (TBI) is a major cause of death and permanent disability in the United States. Approximately 1.7 million cases of TBI are reported annually. After an injury to the head, excessive glutamate, an excitatory neurotransmitter, is released into the extracellular fluid resulting in the excitotoxic death of neuronal tissue. Recent studies have suggested neurosteroids, may serve as an effective means by which to modulate excitotoxicity via the excitatory neurotransmitter alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA). Using mixed astrocyte-neuronal cell cultures (14-16 DIV) exposed to increasing concentrations of AMPA as the model for TBI, the experiments examined the effect of the neurosteroids, …
Gabaergic And Glutamatergic Identities Of Developing Midbrain Pitx2 Neurons, Mindy Waite
Gabaergic And Glutamatergic Identities Of Developing Midbrain Pitx2 Neurons, Mindy Waite
Mindy Waite
Sex Difference In Calbindin Cell Number In The Mouse Preoptic Area: Effects Of Neonatal Estradiol And Bax Gene Deletion, Richard F. Gilmore Iii
Sex Difference In Calbindin Cell Number In The Mouse Preoptic Area: Effects Of Neonatal Estradiol And Bax Gene Deletion, Richard F. Gilmore Iii
Masters Theses 1911 - February 2014
The sexually dimorphic nucleus of the preoptic area (SDN-POA) was first discovered in rats and is one of the most famous and best studied sex differences in the field of neuroscience. Though well documented in rats (larger in males than females), this sex difference was only recently able to be observed in mice due to the discovery of the protein calbindin-D28k as a marker. Recent studies have shown a larger, more distinct calbindin-immunoreactive (ir) cell cluster in male mice compared to females. However, the exact location of the cluster and whether the sex difference is one of total cell number …
Relative Dependence Of Neural Plasticity On Age And Activity In The Bumblebee (Bombus Huntii), Geoffrey Nielsen
Relative Dependence Of Neural Plasticity On Age And Activity In The Bumblebee (Bombus Huntii), Geoffrey Nielsen
Summer Research
Neural Plasticity is one of the most fascinating and complex aspects of neuroscience. Due to the complexity of neural plasticity mechanisms, simple models are used to study neural plasticity. The bumblebee, Bombus huntii provides an ideal model organism with which to study neural plasticity, particularly the way it is affected by age and activity1. The Mushroom Body is the portion of the B. huntii brain that is responsible for higher order sensory integration and experience related learning so it will be the focus of this study.
Orbitofrontal Cortex Provides Cross-Modal Valuation Of Self-Generated Stimuli, William A. Cunningham, Ingrid J. Haas, Ashley S. Waggoner
Orbitofrontal Cortex Provides Cross-Modal Valuation Of Self-Generated Stimuli, William A. Cunningham, Ingrid J. Haas, Ashley S. Waggoner
Department of Political Science: Faculty Publications
Prior research has shown that the orbitofrontal cortex (OFC) plays an important role in the representation of the evaluation of stimuli, regardless of stimulus modality. Based on these findings, researchers have proposed that the OFC serves a common currency function, allowing for the direct comparison of different types of perceptual stimuli (e.g. food, drink, money). The present study was designed to extend this research and investigate whether these same regions of OFC that have been identified in previous research are involved in evaluating imagined stimuli. Specifically, we asked participants to draw on prior attitudinal knowledge to generate internal representations of …
Nico-Teen: Neural Substrates That Mediate Adolescent Tobacco Abuse., Laura O'Dell
Nico-Teen: Neural Substrates That Mediate Adolescent Tobacco Abuse., Laura O'Dell
Laura Elena O'Dell
No abstract provided.
Nico-Teen: Neural Substrates That Mediate Adolescent Tobacco Abuse., Laura O'Dell
Nico-Teen: Neural Substrates That Mediate Adolescent Tobacco Abuse., Laura O'Dell
Laura Elena O'Dell
No abstract provided.
Regulation Of Akt And Wnt Signalling By The Dopamine D2 Receptor And Metabotropic Glutamate Receptor 2/3, Laurie P. Sutton
Regulation Of Akt And Wnt Signalling By The Dopamine D2 Receptor And Metabotropic Glutamate Receptor 2/3, Laurie P. Sutton
Electronic Thesis and Dissertation Repository
Akt and the Wnt pathway, two cascades that regulate GSK-3, have been implicated in schizophrenia and antipsychotic drug action. Although it is known that antipsychotic drugs alleviate psychosis by blocking the dopamine D2 receptor (D2DR) and that metabotropic glutamate receptor 2/3 (mGluR2/3) agonists may improve some of the symptoms of schizophrenia, it is unclear if both classes of drugs exert their effects through Akt, GSK-3 and/or the Wnt pathway or if changes in these pathways are mediated through the D2DR and mGluR2/3 respectively. In addition to antipsychotics, mood stabilizers and antidepressants also target GSK-3, suggesting that there must be something …
Characterizing And Treating The Neuropathology Of Tuberous Sclerosis Complex In The Mouse, Sharon W. Way
Characterizing And Treating The Neuropathology Of Tuberous Sclerosis Complex In The Mouse, Sharon W. Way
Dissertations & Theses (Open Access)
Tuberous sclerosis complex (TSC) is a multisystem, autosomal dominant disorder affecting approximately 1 in 6000 births. Developmental brain abnormalities cause substantial morbidity and mortality and often lead to neurological disease including epilepsy, cognitive disabilities, and autism. TSC is caused by inactivating mutations in either TSC1 or TSC2, whose protein products are known inhibitors of mTORC1, an important kinase regulating translation and cell growth. Nonetheless, neither the pathophysiology of the neurological manifestations of TSC nor the extent of mTORC1 involvement in the development of these lesions is known. Murine models would greatly advance the study of this debilitating disorder. This thesis …
Fibrinolytic Proteins And Brain-Derived Neurotrophic Factor Modulation Of Suprachiasmatic Nucleus Circadian Clock, Xiang Mou
Doctoral Dissertations
Mammalian circadian rhythms are controlled by a clock located in the suprachiasmatic nucleus (SCN). The mechanisms through which light phase-shifts the SCN circadian clock are similar to those underlying memory formation and long-term potentiation (LTP). Several secreted proteins, including tissue-type plasminogen activator (tPA), plasminogen, and brain-derived neurotrophic factor (BDNF), have been implicated in this process. These same proteins are important for photic phase-shifts of the SCN circadian clock. Early night glutamate application to SCN containing brain slices resets the circadian clock. Our experiments find that the endogenous tPA inhibitor, plasminogen activator inhibitor 1(PAI-1), blocked these shifts in slices from wildtype …
Presenilin Is Necessary For The Function Of Cbp In The Adult Drosophila Cns, Randy S. Boyles
Presenilin Is Necessary For The Function Of Cbp In The Adult Drosophila Cns, Randy S. Boyles
UNLV Theses, Dissertations, Professional Papers, and Capstones
Dominant mutations in Presenilin (Psn) have been correlated with the formation of Aß- containing plaques in patients with inherited forms of Alzheimer's disease (AD). However, a clear mechanism directly linking amyloid plaques to the pathology of familial or sporadic forms of AD has remained elusive. Thus, recent discoveries of several new substrates for Psn protease activity have sparked alternative hypotheses to explain the preclinical symptoms of AD. CBP (CREB-binding protein) is a haplo- insufficient transcriptional co-activator with histone acetyltransferase (HAT) activity that has been proposed to be a downstream target for Psn signaling. Individuals with reduced CBP levels have cognitive …
Dopaminergic Innervation Of The Subventricular Zone In The Murine Brain, Linda Beth Drozdowicz
Dopaminergic Innervation Of The Subventricular Zone In The Murine Brain, Linda Beth Drozdowicz
Honors Scholar Theses
The subventricular zone (SVZ) is one of two areas in the brain that, in a healthy mouse, continually generate neurons throughout adulthood. While it was previously thought that only the A9 neurons of the substantia nigra sent dopaminergic afferents to the SVZ, recent studies suggest that the A10 neurons of the ventral tegmental area may innervate this area. This project has aimed to discover which, if either, model is correct.
Examination of the Aphakia (AK) mouse was used to determine the role of distinct midbrain regions in SVZ regulation. Additionally, intraperitoneal injections of the chemical MPTP were used to deduce …
Protein-Protein Interactions That Regulate Neurotransmitter Release From Retinal Ribbon Synapses, (Leigh) Beth T. Latham
Protein-Protein Interactions That Regulate Neurotransmitter Release From Retinal Ribbon Synapses, (Leigh) Beth T. Latham
Dissertations & Theses (Open Access)
Protein-Protein Interactions That Regulate Neurotransmitter Release from Retinal Ribbon Synapses Photoreceptors and bipolar cells in the retina form specialized chemical synapses called ribbon synapses. This type of synapse differs physiologically from “conventional” chemical synapses. While “conventional” synapses exocytose neurotransmitter-filled vesicles in an all-or-none fashion in response to an action potential, a retinal ribbon synapse can release neurotransmitter tonically (sustained) in response to graded changes in membrane potential or phasically (transient) in response to a large change in membrane potential.
Synaptic vesicle exocytosis is a tightly controlled process involving many protein-protein interactions. Therefore, it is likely that the dissimilarity in the …
Damage-Induced Inflammation And Nociceptive Hypersensitivity In Drosophila Larvae, Daniel T. Babcock
Damage-Induced Inflammation And Nociceptive Hypersensitivity In Drosophila Larvae, Daniel T. Babcock
Dissertations & Theses (Open Access)
Mounting an effective response to tissue damage requires a concerted effort from a number of systems, including both the immune and nervous systems. Immune-responsive blood cells fight infection and clear debris from damaged tissues, and specialized pain receptors become hypersensitive to promote behavior that protects the damaged area while it heals. To uncover the cellular and molecular mechanisms underlying these processes, we have developed a genetically tractable invertebrate model of damage-induced inflammation and pain hypersensitivity using Drosophila larvae.
To study wound-induced inflammation, we generated transgenic larvae with fluorescent epidermal cells and blood cells (hemocytes). Using live imaging, we monitored the …
The Expression And Cellular Localization Of Cc-Chemokine Receptor 5 (Ccr5) After Traumatic Brain Injury, Vuvi H. Nguyen
The Expression And Cellular Localization Of Cc-Chemokine Receptor 5 (Ccr5) After Traumatic Brain Injury, Vuvi H. Nguyen
Dissertations & Theses (Open Access)
Traumatic brain injury results from a primary insult and secondary events that together result in tissue injury. This primary injury occurs at the moment of impact and damage can include scalp laceration, skull fraction, cerebral contusions and lacerations as well as intracranial hemorrhage. Following the initial insult, a delayed response occurs and is characterized by hypoxia, ischemia, cerebral edema, and infection. During secondary brain injury, a series of neuroinflammatory events are triggered that can produce additional damage but may also help to protect nervous tissue from invading pathogens and help to repair the damaged tissue. Brain microglia and astrocytes become …
Genes Involved In Mushroom Body Development And Behavior In Drosophila, Christine Nicole Serway
Genes Involved In Mushroom Body Development And Behavior In Drosophila, Christine Nicole Serway
UNLV Theses, Dissertations, Professional Papers, and Capstones
Mushroom bodies (MBs) are the site of multi modal sensory integration critical for associative conditioning in Drosophila. They have been central to research on the structure function relationship in the brain for over one hundred years due to their unique shape and readily accessible physiology. This dissertation incorporates three different approaches to further elucidate the genetic and molecular nature of this structure function relationship.
First, the suite of genetic and molecular tools available in Drosophila melanogaster, facilitated the molecular mapping of a 25-year old MB structural mutant called mushroom body miniature B (mbmB) to the gene Pendulin [Pen, also known …
Signaling Mechanisms That Control Gap Junctional Coupling Between Retinal Neurons, Wade Kothmann
Signaling Mechanisms That Control Gap Junctional Coupling Between Retinal Neurons, Wade Kothmann
Dissertations & Theses (Open Access)
Gap junctions between neurons form the structural substrate for electrical synapses. Connexin 36 (Cx36, and its non-mammalian ortholog connexin 35) is the major neuronal gap junction protein in the central nervous system (CNS), and contributes to several important neuronal functions including neuronal synchronization, signal averaging, network oscillations, and motor learning. Connexin 36 is strongly expressed in the retina, where it is an obligatory component of the high-sensitivity rod photoreceptor pathway. A fundamental requirement of the retina is to adapt to broadly varying inputs in order to maintain a dynamic range of signaling output. Modulation of the strength of electrical coupling …
The Expression And Cellular Localization Of Cc-Chemokine Receptor 5 (Ccr5) After Traumatic Brain Injury, Vuvi H. Nguyen
The Expression And Cellular Localization Of Cc-Chemokine Receptor 5 (Ccr5) After Traumatic Brain Injury, Vuvi H. Nguyen
Dissertations & Theses (Open Access)
Traumatic brain injury results from a primary insult and secondary events that together result in tissue injury. This primary injury occurs at the moment of impact and damage can include scalp laceration, skull fraction, cerebral contusions and lacerations as well as intracranial hemorrhage. Following the initial insult, a delayed response occurs and is characterized by hypoxia, ischemia, cerebral edema, and infection. During secondary brain injury, a series of neuroinflammatory events are triggered that can produce additional damage but may also help to protect nervous tissue from invading pathogens and help to repair the damaged tissue. Brain microglia and astrocytes become …
Developmental Changes In The Structure And Composition Of The Postsynaptic Density, Matthew T. Swulius
Developmental Changes In The Structure And Composition Of The Postsynaptic Density, Matthew T. Swulius
Dissertations & Theses (Open Access)
The development of the brain and its underlying circuitry is dependent on the formation of trillions of chemical synapses, which are highly specialized contacts that regulate the flow of information from one neuron to the next. It is through these synaptic connections that neurons wire together into networks capable of performing specific tasks, and activity-dependent changes in their structural and physiological state is one way that the brain is thought to adapt and store information. At the ultrastructural level, developmental and activity-dependent changes in the size and shape of dendritic spines have been well documented, and it is widely believed …
Metastability And Plasticity In A Conceptual Model Of Neurons, Bo Deng
Metastability And Plasticity In A Conceptual Model Of Neurons, Bo Deng
Department of Mathematics: Faculty Publications
For a new class of neuron models we demonstrate here that typical membrane action potentials and spike-bursts are only transient states but appear to be asymptotically stable; and yet such metastable states are plastic — being able to dynamically change from one action potential to another with different pulse frequencies and from one spike-burst to another with different spike-per-burst numbers. The pulse and spike-burst frequencies change with individual ions’ pump currents while their corresponding metastable-plastic states maintain the same transmembrane voltage and current profiles in range. It is also demonstrated that the plasticity requires two one-way ion pumps operating in …
Dopamine D2 Receptor Priming Enhances Dopaminergic Response To Amphetamine In The Nucleus Accumbens: Role Of The D1 And D2 Receptors., Kimberly Norris Huggins
Dopamine D2 Receptor Priming Enhances Dopaminergic Response To Amphetamine In The Nucleus Accumbens: Role Of The D1 And D2 Receptors., Kimberly Norris Huggins
Electronic Theses and Dissertations
In past work, we have shown neonatal quinpirole (dopamine D2/D3 agonist) treatment produces a significant increase in dopamine D2 receptor sensitivity, a phenomenon known as D2 receptor priming. Dopamine D2 receptor priming is common in psychosis. Male and female rats were administered quinpirole (1mg/kg) or saline from postnatal days 1-11 and raised to adulthood (P60). As adults, rats were administered d-amphetamine sulfate (1mg/kg) or saline every other day for 14 days. Approximately 10 min before each amphetamine or saline injection, animals were administered the D1 antagonist SCH 23390 (0.1 mg/kg), the D2 antagonist eticlopride …
Manipulating Neuronal Circuits With Endogenous And Recombinant Cell-Surface Tethered Modulators, Mande Holford, Sebastian Auer, Martin Laqua, Ines Ibanez-Tallon
Manipulating Neuronal Circuits With Endogenous And Recombinant Cell-Surface Tethered Modulators, Mande Holford, Sebastian Auer, Martin Laqua, Ines Ibanez-Tallon
Publications and Research
Neuronal circuits depend on the precise regulation of cell-surface receptors and ion channels. An ongoing challenge in neuroscience research is deciphering the functional contribution of specifi c receptors and ion channels using engineered modulators. A novel strategy, termed “tethered toxins”, was recently developed to characterize neuronal circuits using the evolutionary derived selectivity of venom peptide toxins and endogenous peptide ligands, such as lynx1 prototoxins. Herein, the discovery and engineering of cell-surface tethered peptides is reviewed, with particular attention given to their cell-autonomy, modular composition, and genetic targeting in different model organisms. The relative ease with which tethered peptides can be …
Impairments In Attention In Occasionally Snoring Children: An Event-Related Potential Study., Maria E. Barnes, Elizabeth A. Huss, Krista N. Garrod, Eric Van Ray, Ehab Dayyat, David Gozal, Dennis L. Molfese
Impairments In Attention In Occasionally Snoring Children: An Event-Related Potential Study., Maria E. Barnes, Elizabeth A. Huss, Krista N. Garrod, Eric Van Ray, Ehab Dayyat, David Gozal, Dennis L. Molfese
Faculty Scholarship
Objective: To determine whether minimal snoring is benign in children. Procedure: 22 rarely snoring children (mean age = 6.9 years, 11 females) and age- and sex-matched controls participated in an auditory oddball task wearing 128-electrode nets. Parents completed the Conners Parent Rating Scales–Revised Long (CPRS–R:L). Results: Snorers scored significantly higher on four CPRS-R:L subscales. Stepwise regression indicated that two ERP variables from a region of the ERP that peaked at 844 msec post-stimulus onset predicted CPRS-R:L Attention Deficit Hyperactivity Disorder (ADHD) Index scores. Conclusions: Occasional snorers, according to parental report, do exhibit ADHD-like behaviors. Basic sensory processing is longer than …
P2x Antagonists Inhibit Styryl Dye Entry Into Hair Cells, M. A. Crumling, M. Tong, K. L. Aschenbach, L. Liu
P2x Antagonists Inhibit Styryl Dye Entry Into Hair Cells, M. A. Crumling, M. Tong, K. L. Aschenbach, L. Liu
University Faculty Publications and Creative Works
The styryl pyridinium dyes, FM1-43 and AM1-43, are fluorescent molecules that can permeate the mechanotransduction channels of hair cells, the sensory receptors of the inner ear. When these dyes are applied to hair cells, they enter the cytoplasm rapidly, resulting in a readily detectable intracellular fluorescence that is often used as a molecular indication of mechanotransduction channel activity. However, such dyes can also permeate the ATP receptor, P2X2. Therefore, we explored the contribution of P2X receptors to the loading of hair cells with AM1-43. The chick inner ear was found to express P2X receptors and to release ATP, similar to …
Dopamine Controls Locomotion By Modulating The Activity Of The Cholinergic Motor Neurons In C. Elegans, Andrew T. Allen
Dopamine Controls Locomotion By Modulating The Activity Of The Cholinergic Motor Neurons In C. Elegans, Andrew T. Allen
Masters Theses 1911 - February 2014
Dopamine is an important neurotransmitter in the brain, where it plays a regulatory role in the coordination of movement and cognition by acting through two classes of G protein-coupled receptors to modulate synaptic activity. In addition, it has been shown these two receptor classes can exhibit synergistic or antagonistic effects on neurotransmission. However, while the pharmacology of the mammalian dopamine receptors have been characterized in some detail, less is known about the molecular pathways that act downstream of the receptors. As in mammals, the soil nematode Caenorhabditis elegans uses two classes of dopamine receptors to control neural activity and thus …
A New Laser Pointer Driven Optical Microheater For Precise Local Heat Shock, Mike Placinta
A New Laser Pointer Driven Optical Microheater For Precise Local Heat Shock, Mike Placinta
Masters Theses 1911 - February 2014
The zebrafish has emerged as an important genetic model system for the study of vertebrate development. However, while genetics is a powerful tool for the study of early gene functions, the approach is more limited when it comes to understanding later functions of genes that have essential roles in early embryogenesis. There is thus a need to manipulate gene expression at different times, and ideally only in some regions of the developing embryo. Methods for conditional gene regulation have been established in Drosophila, C.elegans and the mouse, utilizing conditional gene activation systems such as the Gal4-UAS system (fly) and the …
Mcp-1 And App Involvement Of Glial Differentiation And Migration Of Neuroprogenitor Cells, Emmanuel Vrotsos
Mcp-1 And App Involvement Of Glial Differentiation And Migration Of Neuroprogenitor Cells, Emmanuel Vrotsos
Electronic Theses and Dissertations
Neuroprogenitor cells are an important resource because of their potential to replace damaged cells in the brain caused by trauma and disease. It is of great importance to better understand which factors influence the differentiation and migration of these cells. Previously it has been reported that neuroprogenitor cells undergoing apoptotic stress have increased levels of Amyloid precursor protein (APP) and increased APP expression results in glial differentiation. APP activity was also shown to be required for staurosporine induced glial differentiation of neuroprogenitor cells. Monocyte chemoattractant protein-1 (MCP-1) is a chemokine that is expressed during inflammatory. The binding of MCP-1 to …
In Vitro Guidance Of Retinal Axons By A Tectal Lamina-Specific Glycoprotein Nel, Yulan Jiang, Hiroya Obama, Soh-Leh Kuan, Ritsuko Nakamura, Chizu Nakamoto, Zhufeng Ouyang, Masaru Nakamoto
In Vitro Guidance Of Retinal Axons By A Tectal Lamina-Specific Glycoprotein Nel, Yulan Jiang, Hiroya Obama, Soh-Leh Kuan, Ritsuko Nakamura, Chizu Nakamoto, Zhufeng Ouyang, Masaru Nakamoto
Biology Faculty Publications
Nel is a glycoprotein containing five chordin-like and six epidermal growth factor-like domains and is strongly expressed in the nervous system. In this study, we have examined expression patterns and in vitro functions of Nel in the chicken retinotectal system. We have found that in the developing tectum, expression of Nel is localized in specific laminae that retinal axons normally do not enter, including the border between the retinorecipient and non-retinorecipient laminae. Nel-binding activity is detected on retinal axons both in vivo and in vitro, suggesting that retinal axons express a receptor for Nel. In vitro, Nel inhibits retinal axon …
Impact Of Serotonin 2c Receptor Null Mutation On Physiology And Behavior Associated With Nigrostriatal Dopamine Pathway Function., Laura O'Dell
Laura Elena O'Dell
No abstract provided.
Alcohol Self-Administration Acutely Stimulates The Hypothalamic-Pituitary-Adrenal (Hpa) Axis, But Alcohol Dependence Leads To A Dampened Neuroendocrine State, Laura O'Dell
Laura Elena O'Dell
No abstract provided.