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Exploring Drivers Of Sex-Based Disparities In Relapsing Multiple Sclerosis, Stephanie K. Buxhoeveden Jan 2024

Exploring Drivers Of Sex-Based Disparities In Relapsing Multiple Sclerosis, Stephanie K. Buxhoeveden

Theses and Dissertations

Females are three times more susceptible to relapsing multiple sclerosis (MS) and males typically have more severe disease, but the molecular underpinnings of these sex-based disease disparities are unknown and represent a critical knowledge gap.Subject Population: Blood samples from a demographically homogenous group of treatment naïve males and females with relapsing-MS and healthy controls. Research Design: Cross-sectional combinatorial omics pilot study. Instruments: Whole transcriptomic analysis with messenger RNA (mRNA) expression profiling using next generation sequencing (RNA-seq) and micro-RNA (miRNA) expression using NanoString technology. Aim 1) Identify and compare the actively expressed mRNAs in the transcriptome of males and …


Theta Burst Brain Stimulation In Painful Diabetic Neuropathy Patients: Investigating Neural Mechanisms, Bhushan Thakkar Jan 2022

Theta Burst Brain Stimulation In Painful Diabetic Neuropathy Patients: Investigating Neural Mechanisms, Bhushan Thakkar

Theses and Dissertations

Chronic pain (CP) is a significant contributor to disability and disease burden globally. In 2019, approximately 50.2 million adults (20.4% of the US population) experienced chronic pain, contributing to $560-635 billion in direct medical costs. In addition, the worldwide prevalence of diabetes mellitus has reached epidemic proportions and is set to increase to 629 million by 2045. Almost 50% of patients with diabetes present with diabetic neuropathy (DN), and one in five patients with diabetes presents with painful DN (pDN) which is the most common cause of neuropathic pain (NP) in the US. Symptomatic treatment is the mainstay of management …


Modulation In Nmda Receptor Function Alleviates Safety Learning Deficit In Females Who Experienced Chronic Stress During Adolescence, Zuby C. Okafor Jan 2021

Modulation In Nmda Receptor Function Alleviates Safety Learning Deficit In Females Who Experienced Chronic Stress During Adolescence, Zuby C. Okafor

Theses and Dissertations

Anxiety disorders disproportionately impact women and are more prevalent in people with a history of chronic stress. Post-traumatic stress disorder (PTSD) is a type of stress and trauma-related disorder that is largely characterized by hyperarousal to fear-based cues. The inability to dissociate the fear-response from a non-threatening cue is known as impaired safety learning. Given that N-methyl-D-aspartate (NMDA) receptors are key mediators of learning behaviors, we examined the role of NMDAr function in deficient safety learning. Previous studies have shown that female rats with a history of stress have altered NMDAr gene expression and altered glutamatergic signaling; therefore, we hypothesized …


Kcc2: A Novel Therapeutic Target To Rescue Gabaergic Dysfunction And Behavioral Deficits Induced By Hiv And Opiate Use, Aaron J. Barbour Jan 2020

Kcc2: A Novel Therapeutic Target To Rescue Gabaergic Dysfunction And Behavioral Deficits Induced By Hiv And Opiate Use, Aaron J. Barbour

Theses and Dissertations

With adherence to combined antiretroviral therapy (cART), HIV infection can be considered a controllable chronic condition, but quality of life issues remain. The preeminent of which, HIV-associated neurocognitive disorders (HAND), encompasses an array of neurological complications and has persisted despite cART implementation. The symptoms of HAND can be exacerbated by opiate use, a common comorbidity for people infected with HIV (PWH). While neurons are not infected by HIV, they incur sublethal damage, with γ-amino butyric acid- (GABA)ergic function being particularly vulnerable to viral and inflammatory factors released by infected/affected glia. This dissertation presents studies on novel organoid and dissociated primary …


Recovery From Visual Dysfunction Following Mild Traumatic Brain Injury Is Associated With Adaptive Reorganization Of Retinal Inputs To Lateral Geniculate Nucleus In The Mouse Model Utilizing Central Fluid Percussion Injury., Vishal C. Patel Jan 2020

Recovery From Visual Dysfunction Following Mild Traumatic Brain Injury Is Associated With Adaptive Reorganization Of Retinal Inputs To Lateral Geniculate Nucleus In The Mouse Model Utilizing Central Fluid Percussion Injury., Vishal C. Patel

Theses and Dissertations

Traumatic brain injury (TBI) is a leading cause of morbidity and mortality nationwide. Prevalence of mild TBI (mTBI) vastly outnumbers more severe forms however the associated morbidity has only recently gained public attention. Visual dysfunction is a significant component of mTBI associated morbidity with recovery of function linked with improvement in global outcomes. Examination of sensory and motor pathways in other brain injury paradigms support that recovery is largely dependent on adaptive plasticity of remaining connections. Current examinations of visual function recovery following mTBI is limited to identifying evidence for recovery and objective evidence for adaptive plasticity is limited. Therefore, …


A High Fructose Diet Alters Affective-Like Behavior And Metrics Of Synaptic Mitochondrial Function Differentially In Male And Female Rats, Alix H. Kloster Jan 2019

A High Fructose Diet Alters Affective-Like Behavior And Metrics Of Synaptic Mitochondrial Function Differentially In Male And Female Rats, Alix H. Kloster

Theses and Dissertations

Fructose consumption has become a normalized part of the standard American diet over the past 40 years. While fructose consumption is a known risk factor of metabolic syndrome, there is increasing evidence that fructose consumption influences brain and behavior. Recently, more interest has been focused on mitochondrial dysfunction as a potential link between metabolic stress and modifications of the central nervous system. Mitochondria are in the unique position of both regulating and being vulnerable to alterations in energy homeostasis. Sex-differences are well categorized in the presentation of metabolic symptoms associated with excessive fructose consumption. Thus, it is important to characterize …


The Contribution Of Sarm1 To Axonal Degeneration In Cns Inflammatory Disorders, Daniel C. Njoku Jan 2018

The Contribution Of Sarm1 To Axonal Degeneration In Cns Inflammatory Disorders, Daniel C. Njoku

Theses and Dissertations

BACKGROUND: Multiple sclerosis (MS) is an inflammatory disease of the central nervous system (CNS) that results in demyelination and axonal loss. Efficiently targeting mechanisms of axonal degeneration in MS has the potential to reduce disability but remains an unmet need. Prior research has identified the protein sterile alpha and TIR motif containing 1 (SARM1) as a critical factor that promotes axonal destruction in the program of axonal degeneration known as Wallerian degeneration. SARM1 inactivation reduces axonal degeneration in a variety of contexts including traumatic and toxic injury, but it remains unknown to what extent SARM1 is involved in axonal degeneration …


Metabotropic Glutamate Receptor 2 Activation: Computational Predictions And Experimental Validation, Amr Ellaithy Jan 2018

Metabotropic Glutamate Receptor 2 Activation: Computational Predictions And Experimental Validation, Amr Ellaithy

Theses and Dissertations

G protein-coupled receptors (GPCRs) are the largest family of signaling proteins in animals and represent the largest family of druggable targets in the human genome. Therefore, it is of no surprise that the molecular mechanisms of GPCR activation and signal transduction have attracted close attention for the past few decades. Several stabilizing interactions within the GPCR transmembrane (TM) domain helices regulate receptor activation. An example is a salt bridge between 2 highly conserved amino acids at the bottom of TM3 and TM6 that has been characterized for a large number of GPCRs. Through structural modeling and molecular dynamics (MD) simulations, …


Epigenetic Editing To Validate Findings From Methylome-Wide Association Studies Of Neuropsychiatric Disorders, Robin F. Chan Jan 2017

Epigenetic Editing To Validate Findings From Methylome-Wide Association Studies Of Neuropsychiatric Disorders, Robin F. Chan

Theses and Dissertations

DNA methylation is necessary for learning, memory consolidation and has been implicated in a number of neuropsychiatric disorders. Obtaining high quality and comprehensive data for the three common forms of methylation in brain is challenging for methylome-wide association studies (MWAS). To address this we optimized a panel of enrichment methods for screening the brain methylome. Results show that these enrichment techniques approach the coverage and fidelity of the current gold standard bisulfite based techniques. Our MBD-based method can also be used with low amounts of genomic material from limited human biomaterials. Psychiatric disorders have high prevalence and are often chronic …


Potential Treatments For Malformation Associated Epilepsy, Olivia M. Bowles Jan 2016

Potential Treatments For Malformation Associated Epilepsy, Olivia M. Bowles

Theses and Dissertations

Epilepsy has been previously attributed to either increased excitation or decreased inhibition. With this closed frame of mind, modern medicine has been unable to develop a permanent treatment against the mechanisms of epilepsy. In order to treat patients with intractable seizures, especially those caused by developmental malformations, it is essential to understand the entirety of mechanisms that could possibly play a role in the abnormal cortical function. One such developmental malformation is known as polymicrogyria. Epileptogenesis occurs in an area laterally adjacent to this malformation known as the paramicrogyral region (PMR). Past studies have narrowed down the potential cause of …


Post-Tbi Hippocampal Neurogenesis In Different Tbi Models, Kaushal S. Patel Jan 2016

Post-Tbi Hippocampal Neurogenesis In Different Tbi Models, Kaushal S. Patel

Theses and Dissertations

Traumatic brain injury (TBI) leads to short-term and long-term consequences that can cause many different life-long disorders. Studies of TBI have generally focused on the acute stage; however, it is now becoming important to investigate chronic responses following TBI as clinical reports of dementia and cognitive impairments have been linked to a history of TBI. Recent data have established that cognitive function is associated with hippocampal neurogenesis. Chronic injury induced changes in the brain may affect this endogenous process. Chronic responses following TBI include cell death pathways and inflammatory responses that are persistent in the brain for months to years …


The Effects Of 7,8-Dihydroxyflavone On Hippocampal Neurogenesis Following Traumatic Brain Injury, Mary K. Wurzelmann Jan 2016

The Effects Of 7,8-Dihydroxyflavone On Hippocampal Neurogenesis Following Traumatic Brain Injury, Mary K. Wurzelmann

Theses and Dissertations

Following traumatic brain injury (TBI), the hippocampus is particularly vulnerable to damage, and BDNF, an endogenous neurotrophin that activates the TrkB receptor, has been shown to play a key role in the brain’s neuroprotective response. Activation of the TrkB signaling pathway by BDNF in the CNS promotes cell survival and aids in cell growth. However, due to its inability to cross the blood brain barrier (BBB), the therapeutic advantages of BDNF treatment following TBI are limited. 7,8-Dihydroxyflavone (7,8-DHF) is a flavonoid that mimics the effects of BDNF, is a potent TrkB receptor agonist, and can successfully cross the BBB. Our …


Autotaxin In Central Nervous System Development And Disease, Natalie A. Wheeler Jan 2016

Autotaxin In Central Nervous System Development And Disease, Natalie A. Wheeler

Theses and Dissertations

During development, oligodendrocytes (OLGs), the myelinating cells of the central nervous system (CNS), undergo a stepwise progression during which OLG progenitors, specified from neural stem/progenitor cells, differentiate into fully mature myelinating OLGs. This progression along the OLG lineage is characterized by well-synchronized changes in morphology and gene expression patterns. The studies presented in this dissertation identified the extracellular factor Autotaxin (ATX) as a novel upstream signal modulating HDAC1/2 activity and gene expression in cells of the OLG lineage. Using the zebrafish as an in vivo model system, as well as rodent primary OLG cultures, this functional property of ATX was …


Human Neural Progenitor Cells Are Productively Infected By R5-Tropic Hiv-1: Opiate Interactions On Infection And Function Involve Cdk5 Signaling, Joyce Magat Balinang Jan 2016

Human Neural Progenitor Cells Are Productively Infected By R5-Tropic Hiv-1: Opiate Interactions On Infection And Function Involve Cdk5 Signaling, Joyce Magat Balinang

Theses and Dissertations

Human immunodeficiency virus type 1 (HIV-1) is known to cause a spectrum of neurological, behavioral and motor deficits collectively termed as HIV-1 associated neurocognitive impairments (HAND). Opiates augment HIV-related CNS complications through both direct and indirect mechanisms that disrupt glial and neuronal function. All CNS macroglia and neurons derive from neural progenitor cells (NPCs) during development, and NPCs in the adult brain contribute to repair processes. Since disruptions in NPC function are known to impact CNS populations and brain function in a number of disease/injury conditions, we determined whether HIV ± opiate exposure affected the maturation and fate of human …


Effects Of Hiv-1 Tat On The Enteric Nervous, Joy Ngwainmbi Jan 2015

Effects Of Hiv-1 Tat On The Enteric Nervous, Joy Ngwainmbi

Theses and Dissertations

More than 1.2 million people are estimated to be currently living with the human immunodeficiency virus (HIV) in the United States of America. The gastrointestinal (GI) tract is both a major target and an important component of HIV pathogenesis. The GI processes that are dysregulated during HIV infection are controlled by the enteric nervous system (ENS). Indeed, both clinical and experimental studies have implicated the ENS in HIV and simian immunodeficiency virus (SIV) pathogenesis. In addition to direct viral effects, the HIV virus also indirectly affects the GI tract via cellular and/or viral toxins released by infected cells. Trans-activator of …


Axon Initial Segment Stability In Multiple Sclerosis, Suneel K. Thummala Jan 2015

Axon Initial Segment Stability In Multiple Sclerosis, Suneel K. Thummala

Theses and Dissertations

Multiple sclerosis (MS) is an autoimmune disease of the central nervous system characterized by inflammation and demyelination. In addition to these hallmark features, MS also presents with axonal pathology, which is likely responsible for the signs and symptoms of the disease. Although prominent in MS, axonal pathology is frequently considered a consequence of demyelination and not a primary event. This conclusion is consistent with demyelination inducing the loss of specific axonal domains, known as the nodes of Ranvier that are responsible for the propagation of action potentials along the axon. In contrast, we propose that axonal pathology associated with MS …


Psychoactive Synthetic Cathinones (Or 'Bath Salts'): Investigation Of Mechanisms Of Action, Farhana Sakloth Jan 2015

Psychoactive Synthetic Cathinones (Or 'Bath Salts'): Investigation Of Mechanisms Of Action, Farhana Sakloth

Theses and Dissertations

Synthetic cathinones represent threatening and high abuse-potential designer drugs. These are analogs of cathinone (the b-keto analog of amphetamine (AMPH)) a naturally occurring stimulant found in the plant Catha Edulis. Methcathinone (MCAT) was the first synthetic analog of cathinone to be identified in 1987 by Glennon and co-workers and it exerted its action primarily through the dopamine transporter (DAT). Most central stimulants exert their action via monomaine transporters by causing either the release (e.g. cathinone analogs such as MCAT) or by preventing the reuptake (e.g. cocaine) of the neurotransmitter dopamine (DA) thus increasing the extracellular synaptosomal concentration of this …


Mitochondrial Biogenesis And Electrical Properties Of Hpsc-Derived Motor Neurons, Laura O'Brien Jan 2015

Mitochondrial Biogenesis And Electrical Properties Of Hpsc-Derived Motor Neurons, Laura O'Brien

Theses and Dissertations

Human pluripotent stem cells (hPSCs), including human embryonic stem cells (hESCs) and induced pluripotent stem cells (iPSCs) hold great promise in the fields of drug development and regenerative medicine. If iPSCs reprogrammed from patient cells replicate what is seen in vivo they may be used as a model of disease. A process that is disrupted in many neurodegenerative diseases is mitochondrial biogenesis. One of these diseases is amyotrophic lateral sclerosis (ALS), which is characterized by loss of motor neurons in the brain and spinal cord. Differentiation of hPSCs into motor neurons offers a way to study a previous unavailable cell …


Effects Of Hiv-1 Viral Protein Tat On The Viability And Function Of Oligodendroglial Cells, Shiping Zou Jan 2015

Effects Of Hiv-1 Viral Protein Tat On The Viability And Function Of Oligodendroglial Cells, Shiping Zou

Theses and Dissertations

Myelin pallor is frequently reported in HIV patients, and can occur in the CNS prior to other evidence of disease process. Our exploratory studies showed that oligodendrocytes (OLs) are direct targets of HIV-1 Tat (transactivator of transcription). Tat induces a dose-dependent increase of intracellular Ca2+ level ([Ca2+]i) in cultured murine OLs, which can be attenuated by ionotropic glutamate receptor (iGluR) antagonists MK801 and CNQX. The Tat-induced [Ca2+]i increase leads to increased death in immature (O4+, MBP-), but not mature (O4+, MBP+) OLs, over 96 …


A Molecular Mechanism Regulating The Timing Of Corticogeniculate Innervation, Justin Brooks Oct 2013

A Molecular Mechanism Regulating The Timing Of Corticogeniculate Innervation, Justin Brooks

Theses and Dissertations

Visual system development requires the formation of precise circuitry in the dorsal lateral geniculate nucleus (dLGN) of the thalamus. Although much work has examined the molecular mechanisms by which retinal axons target and form synapses in dLGN, much less is known about the mechanisms that coordinate the formation of non-retinal inputs in dLGN. These non-retinal inputs represent ~90% of the terminals that form in dLGN. Interestingly, recently reports show that the targeting and formation of retinal and non-retinal inputs are temporally orchestrated. dLGN relay neurons are first innervated by retinal axons, and it is only after retinogeniculate synapses form that …


Osteopontin Expression During The Acute Immune Response Mediates Reactive Synaptogenesis And Adaptive Outcome, Julie Chan Aug 2013

Osteopontin Expression During The Acute Immune Response Mediates Reactive Synaptogenesis And Adaptive Outcome, Julie Chan

Theses and Dissertations

Traumatic brain injury (TBI) is a worldwide epidemic as the number of victims living with the resulting cognitive and physical impairment continues to rise, principally due to limited treatment options which fail to address its multifaceted sequelae. By approaching TBI therapy from a molecular standpoint, we have the opportunity to develop a better understanding of the mechanisms which prevent effective recovery. With this information, we can move toward the identification of novel therapeutic treatments which target specific molecules to improve patient outcome following TBI. Here, we have focused on the therapeutic potential of osteopontin (OPN), an extracellular matrix (ECM) protein …


Thc-Mediated Induction Of Δfosb And Its Modulation Of Cb1r Signaling And Adaptation, Lazenka Matthew Jan 2013

Thc-Mediated Induction Of Δfosb And Its Modulation Of Cb1r Signaling And Adaptation, Lazenka Matthew

Theses and Dissertations

The main psychoactive and therapeutic effects of Δ9-tetrahydrocannabinol (THC) are mediated through cannabinoid type 1 receptors (CB1Rs). The therapeutic uses of THC are mitigated by the development of tolerance to these therapeutic effects, whereas tolerance does not readily develop to some of the side-effects of THC, like motor impairment and reward. The development of tolerance occurs through adaptations at CB1Rs, which include desensitization (G-protein uncoupling) and downregulation (receptor degradation). Brain region-dependent differences in THC-mediated adaptations are proposed to explain the differences in tolerance to various THC-mediated effects. These studies focused on whether ΔFosB, a stable transcription factor, could regulate CB1R …


Diffuse Traumatic Axonal Injury Within The Visual System: Implications For Visual Pathway Reorganization, Jiaqiong Wang Dec 2012

Diffuse Traumatic Axonal Injury Within The Visual System: Implications For Visual Pathway Reorganization, Jiaqiong Wang

Theses and Dissertations

Traumatic brain injury is a major health problem with much of its morbidity associated with traumatic axonal injury (TAI). To date, significant insight has been gained into the initiating pathogenesis of TAI. However, the specific anterograde and retrograde sequelae of TAI are poorly understood because the diffuse nature of TAI complicates data analysis. To overcome this limitation, we subjected transgenic mice expressing yellow fluorescent protein (YFP) within the visual system to central fluid percussion injury, and consistently generated diffuse TAI within the optic nerve that could easily be followed in the organized YFP positive fibers. We demonstrated progressive axonal swelling, …


Unique Features And Neuronal Properties In A Multisensory Cortex, W. Alex Foxworthy Jun 2012

Unique Features And Neuronal Properties In A Multisensory Cortex, W. Alex Foxworthy

Theses and Dissertations

UNIQUE FEAUTRES OF ORGANIZATION AND NEURONAL PROPERTIES IN A MULTISENSORY CORTEX Multisensory processing is a ubiquitous sensory effect that underlies a wide variety of behaviors, such as detection and orientation, as well as perceptual phenomena from speech comprehension to binding. Such multisensory perceptual effects are presumed to be based in cortex, especially within areas known to contain multisensory neurons. However, unlike their lower-level/primary sensory cortical counterparts, little is known about the connectional, functional and laminar organization of higher-level multisensory cortex. Therefore, to examine the fundamental features of neuronal processing and organization in the multisensory cortical area of the posterior parietal …


Overexpression Of Serum Response Factor In Astrocytes Improves Neuronal Plasticity In A Model Of Fetal Alcohol Spectrum Disorders, Arco P. Paul Apr 2012

Overexpression Of Serum Response Factor In Astrocytes Improves Neuronal Plasticity In A Model Of Fetal Alcohol Spectrum Disorders, Arco P. Paul

Theses and Dissertations

Neuronal plasticity deficits underlie many of the neurobehavioral problems seen in Fetal Alcohol Spectrum Disorders (FASD). Recently, we showed that third trimester alcohol exposure lead to a persistent disruption in ocular dominance (OD) plasticity. For instance, few days of monocular deprivation results in a robust reduction of cortical regions responsive to the deprived eye in normal animals, but not in ferrets exposed early to alcohol. This plasticity deficit can be reversed if alcohol-exposed animals are treated with a phosphodiesterase type 1 (PDE1) inhibitor during the period of monocular deprivation. PDE1 inhibition can increase cAMP and cGMP levels, activating transcription factors …


The Role Of Calcineurin In Dendritic Remodeling And Epileptogenesis In A Rat Model Of Traumatic Brain Injury, John Campbell Feb 2012

The Role Of Calcineurin In Dendritic Remodeling And Epileptogenesis In A Rat Model Of Traumatic Brain Injury, John Campbell

Theses and Dissertations

Traumatic brain injury (TBI), a leading cause of death and disability in the United States, causes potentially preventable damage in part through the dysregulation of neural calcium levels. This dysregulation likely affects the activity of the calcium-sensitive phosphatase, calcineurin, with serious implications for neural function. To test this possibility, the present study characterized the role of calcineurin in a rat model of brain trauma, the lateral fluid percussion injury model. Golgi-Cox histochemistry revealed an acute post-TBI loss and delayed overgrowth of dendritic spines on principal cortical cells. The spine loss appeared to require calcineurin activity, since administering a calcineurin inhibitor, …


Effects Of Early Alcohol Exposure On Ocular Dominance Plasticity, Crystal Lantz Jan 2012

Effects Of Early Alcohol Exposure On Ocular Dominance Plasticity, Crystal Lantz

Theses and Dissertations

Fetal alcohol spectrum disorder is the leading cause of mental retardation in the western world. It is associated with learning and sensory deficits. Some of these deficits are a result of faulty neuronal plasticity. Previously our lab has used ferrets to demonstrate that alcohol exposure during the third trimester of human gestation results in impaired ocular dominance plasticity (ODP). Here we have transferred this model to mice. Mice, treated with 5 mg/kg of ethanol on postnatal days 5, 7 and 9, exhibit a lack of ODP plasticity after 10 days of monocular deprivation (MD) during the critical period of visual …


Cns Neural/Glial Progenitors As Targets Of Hiv-1 And Opiates: Effects On Proliferation And Population Dynamics May Alter Behavior Outcomes., Yun Kyung Hahn Jan 2012

Cns Neural/Glial Progenitors As Targets Of Hiv-1 And Opiates: Effects On Proliferation And Population Dynamics May Alter Behavior Outcomes., Yun Kyung Hahn

Theses and Dissertations

Human immunodeficiency virus (HIV) infected patients with a history of injection opiate abuse have higher incidences of acquired immunodeficiency syndrome (AIDS) and neurological dysfunction. The use of combined anti-retroviral therapy has significantly reduced the prevalence of mortality and progression to AIDS. Due to extended life expectancy, these patients are still at a great risk for HIV-associated neurological disorders and impairment in their later life. Neural progenitor cells (NPCs) play critical roles in brain growth and repair after injury and insult. Pediatric HIV patients whose glial populations are still developing are especially at risk for central nervous system (CNS) damage. Our …


Circuit Development In The Dorsal Lateral Geniculate Nucleus (Dlgn) Of The Mouse., Tania Seabrook Jan 2012

Circuit Development In The Dorsal Lateral Geniculate Nucleus (Dlgn) Of The Mouse., Tania Seabrook

Theses and Dissertations

The visual system is one of the most widely used and best understood sensory systems and the dorsal lateral geniculate nucleus (dLGN) of the mouse has emerged as a model for investigating the cellular and molecular mechanisms underlying the development and activity-dependent refinement of sensory connections. Thalamic organization is highly conserved throughout species and the dLGN of the mouse possesses many features common to higher mammals, such as carnivores and primates. Two general classes of neuron are present within the dLGN, thalamocortical relay cells and interneurons, both of which receive direct retinal input. Axons of relay cells exit dLGN and …


Age Dependent Spatial Characteristics Of Epileptiform Activity In Malformed Cortex, L. Andrew Bell Dec 2011

Age Dependent Spatial Characteristics Of Epileptiform Activity In Malformed Cortex, L. Andrew Bell

Theses and Dissertations

Developmental cortical malformations are a major cause of intractable seizures. Determining the location and timing of susceptibility for epileptiform activity is critical to identifying what mechanisms contribute to epileptogenesis in any model. Using the freeze lesion rat model of polymicrogyria, we have identified, in lesioned cortex, these two aspects of epileptogenesis. Previous studies have demonstrated that epileptiform activity cannot be evoked prior to postnatal day (P) 12, but the malformed cortex is more susceptible to seizures as early as P10. An increase in excitatory afferents to the epileptogenic zone occurs before the onset of network epileptiform activity. Whether or not …