Cerebellar Synaptogenesis: What We Can Learn from Mutant Mice
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Cortical Layer V Neurons in the Auditory and Visual Cortices of Normal, Reeler, and Yotari Mice
Kobe J. Med. Sci., Vol. 56, No. 2, pp. E50-E59, 2010 Cortical Layer V Neurons in the Auditory and Visual Cortices of Normal, reeler, and yotari Mice YASUO YOSHIHARA1, 2, TOMIYOSHI SETSU2, YU KATSUYAMA2, SATOSHI KIKKAWA2, TOSHIO TERASHIMA2*, and KIYOSHI MAEDA1 1Division of Psychiatry, 2Division of Anatomy and Developmental Neurobiology, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe 650-0017, Japan Received 19 January 2010/ Accepted 19 January 2010 Key Words: reeler, yotari, cortex, superior colliculus, inferior colliculus ABSTRACT Both in the Reelin-deficient reeler and Dab1-deficient yotari mice, layer V corticospinal tract neurons in the sensory-motor cortex are radially spread instead of being confined to a single cortical layer. In the present study, we examined distribution pattern of cortical layer V neurons in the visual and auditory cortices of reeler and yotari mice with the injection of HRP into the superior and inferior colliculi of the adult animals, respectively. After the injection of HRP into the superior colliculus of the normal mouse, retrogradely labeled cells were distributed in layer V of the visual cortex, while the similar injection of HRP in the reeler and yotari mice produced radial dispersion of retrograde labeling through all of the depths of the visual cortex of these mutant mice. Next, we injected HRP into the inferior colliculus of the normal, reeler and yotari mice. Retrogradely labeled neurons were distributed in layer V of the normal auditory cortex, whereas they were again radially scattered in the auditory cortex of the reeler and yotari mice. Taken together with the previous and present findings, layer V cortical efferent neurons are radially scattered in the sensory-motor, visual and auditory cortices of the reeler and yotari mice. -
Ultrastructural Study of the Granule Cell Domain of the Cochlear Nucleus in Rats: Mossy Fiber Endings and Their Targets
THE JOURNAL OF COMPARATIVE NEUROLOGY 369~345-360 ( 1996) Ultrastructural Study of the Granule Cell Domain of the Cochlear Nucleus in Rats: Mossy Fiber Endings and Their Targets DIANA L. WEEDMAN, TAN PONGSTAPORN, AND DAVID K. RYUGO Center for Hearing Sciences, Departments of Otolaryngoloby-Head and Neck Surgery and Neuroscience, Johns Hopkins University School of Medicine, Baltimore, Maryland 2 1205 ABSTRACT The principal projection neurons of the cochlear nucleus receive the bulk of their input from the auditory nerve. These projection neurons reside in the core of the nucleus and are surrounded by an external shell, which is called the granule cell domain. Interneurons of the cochlear granule cell domain are the target for nonprimary auditory inputs, including projections from the superior olivary complex, inferior colliculus, and auditory cortex. The granule cell domain also receives projections from the cuneate and trigeminal nuclei, which are first-order nuclei of the somatosensory system. The cellular targets of the nonprimary projections are mostly unknown due to a lack of information regarding postsynaptic profiles in the granule cell areas. In the present paper, we examined the synaptic relationships between a heterogeneous class of large synaptic terminals called mossy fibers and their targets within subdivisions of the granule cell domain known as the lamina and superficial layer. By using light and electron microscopic methods in these subdivisions, we provide evidence for three different neuron classes that receive input from the mossy fibers: granule cells, unipolar brush cells, and a previously undescribed class called chestnut cells. The distinct synaptic relations between mossy fibers and members of each neuron class further imply fundamentally separate roles for processing acoustic signals. -
BDNF Signaling: Harnessing Stress to Battle Mood Disorder Pawel Licznerskia and Elizabeth A
COMMENTARY COMMENTARY BDNF signaling: Harnessing stress to battle mood disorder Pawel Licznerskia and Elizabeth A. Jonasa,1 The link between the onset of major depressive disor- double knockout (DKO) of Gαi1 and Gαi3 results der (MDD) and loss of neurotrophins in the brain is in inhibition of BDNF-induced activation of Akt– of interest to clinicians and basic scientists. MDD is mTORC1 and ERK pathways. shRNA-mediated down- caused by a combination of genetic, environmental, and regulation of Gαi1 and Gαi3 also affects dendritic psychological factors. Trauma, chronic health problems, outgrowth and formation of dendritic spines in the and substance abuse are risks (1), as are grief and other hippocampus. Specific behavioral studies performed purely emotional/cognitive stresses (2, 3). MDD alters by the Marshall team reveal that shRNA knockdown of the expression of neurotrophins, such as brain-derived Gαi1 and Gαi3 or complete DKO cause depression- neurotrophic factor (BDNF). BDNF is required for neu- like behaviors. Their studies suggest that downstream ronal development, survival, and plasticity (4, 5). Brain BDNF signaling via Gαi1 and Gαi3 is necessary not imaging has shown volumetric changes in limbic regions only for sustaining the well-being of neurons but also in depression attributed either to reduced numbers of for normal antidepressive behaviors (11). So, how glia and pyramidal neurons or to their reduced cell body does neurotrophin signaling inside the cell specifically size, accompanied by atrophy of pyramidal neuron api- contribute to the regulation of mental functioning? cal dendrites and decreases in neurogenesis in dentate Neurotrophins, a unique family of polypeptide gyrus (6). -
Reelin Is Preferentially Expressed in Neurons Synthesizing ␥-Aminobutyric Acid in Cortex and Hippocampus of Adult Rats
Proc. Natl. Acad. Sci. USA Vol. 95, pp. 3221–3226, March 1998 Neurobiology Reelin is preferentially expressed in neurons synthesizing g-aminobutyric acid in cortex and hippocampus of adult rats C. PESOLD*†,F.IMPAGNATIELLO*, M. G. PISU*, D. P. UZUNOV*, E. COSTA*, A. GUIDOTTI*, AND H. J. CARUNCHO*‡ *Psychiatric Institute, Department of Psychiatry, College of Medicine, University of Illinois at Chicago, Chicago, IL 60612; and ‡Department of Morphological Sciences, University of Santiango de Compostela School of Medicine, 15705 Santiago de Compostela, Spain Contributed by Erminio Costa, December 24,1997 ABSTRACT During embryonic development of brain lam- sion, prevent Reelin transcription or secretion (4, 12, 14). In inated structures, the protein Reelin, secreted into the extracel- the cortex and hippocampus of rat embryos, Reelin begins to lular matrix of the cortex and hippocampus by Cajal–Retzius be synthesized in Cajal–Retzius (CR) cells from embryonic day (CR) cells located in the marginal zone, contributes to the 13 to the second postnatal week, and in the cerebellum Reelin regulation of migration and positioning of cortical and hip- is expressed first in the external granule cell layer (EGL) pocampal neurons that do not synthesize Reelin. Soon after before the granule cell migration to the internal granule cell birth, the CR cells decrease, and they virtually disappear during layer (IGL) (2, 15–17). When the CR50 antibody is added to the following 3 weeks. Despite their disappearance, we can embryonic preparations expressing normal histogenetic pat- quantify Reelin mRNA (approximately 200 amolymg of total terns of lamination, it induces typical histogenetic abnormal- RNA) and visualize it by in situ hybridization, and we detect the ities of the Relnrl phenotype (7, 9, 10, 17). -
Astrocyte-Derived Thrombospondin Induces Cortical Synaptogenesis in a Sex-Specific Manner
bioRxiv preprint doi: https://doi.org/10.1101/2021.01.04.425242; this version posted January 5, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. Astrocyte-derived thrombospondin induces cortical synaptogenesis in a sex-specific manner. Anna Mazur1, Ean H. Bills1, Brandon J. Henderson1, and W. Christopher Risher1* 1Department of Biomedical Sciences, Joan C. Edwards School of Medicine at Marshall University, Huntington, WV, USA *Corresponding author Abstract The regulation of synaptic connectivity in the brain is vital to proper functioning and development of the central nervous system (CNS). Formation of neural networks in the CNS has been shown to be heavily influenced by astrocytes, which secrete factors, including thrombospondin (TSP) family proteins, that promote synaptogenesis. However, whether this process is different between males and females has not been thoroughly investigated. In this study, we found that cortical neurons purified from newborn male rats showed a significantly more robust synaptogenic response compared to female-derived cells when exposed to factors secreted from astrocytes. This difference was driven largely by the neuronal response to TSP2, which increased synapses in male neurons while showing no effect on female neurons. Blockade of endogenous 17β-estradiol production with letrozole normalized the TSP response between male and female cells, indicating a level of regulation by estrogen signaling. Our results suggest that TSP-induced synaptogenesis is critical for the development of male but not female cortical synapses, contributing to sex differences in astrocyte-mediated synaptic connectivity. Introduction Neurons form complex arrangements throughout the central nervous system (CNS) that form the basis of our ability to think, move, learn, and remember. -
The Reeler Mouse: a Translational Model of Human 3 Neurological Conditions Or Simply a Good Tool for 4 Better Understanding Neurodevelopment?
Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 10 October 2019 doi:10.20944/preprints201910.0120.v1 Peer-reviewed version available at J. Clin. Med. 2019, 8, 2088; doi:10.3390/jcm8122088 1 Review 2 The Reeler Mouse: A Translational Model of Human 3 Neurological Conditions or Simply a Good Tool for 4 Better Understanding Neurodevelopment? 5 6 7 Laura Lossi 1, Claudia Castagna2, Alberto Granato3*, and Adalberto Merighi4* 8 1 Department of Veterinary Sciences, University of Turin, Grugliasco (TO) I-10095, Italy. [email protected] 9 2 Department of Veterinary Sciences, University of Turin, Grugliasco (TO) I-10095, Italy. 10 [email protected] 11 3 Department of Psychology, Catholic University of the Sacred Heart, Milano (MI) I-20123, Italy. 12 [email protected] 13 4 Department of Veterinary Sciences, University of Turin, Grugliasco (TO) I-10095, Italy. 14 [email protected] 15 16 * Correspondence: [email protected], Tel ++39. 02.7234.8588; [email protected] , Tel.: 17 ++39.011.670.9118 18 19 Abstract: 20 The Reeler mutation was described in mouse more than fifty years ago. Later, its causative gene 21 (reln) was discovered in mouse, and its human orthologue (RELN) was demonstrated to be 22 causative of lissencephaly 2 (LIS2) and about 20% of the cases of autosomal-dominant lateral 23 temporal epilepsy (ADLTE). In both human and mice the gene encodes for a glycoprotein referred 24 to as Reelin (Reln) that plays a primary role in neuronal migration during development and 25 synaptic stabilization in adulthood. Besides LIS2 and ADLTE, RELN and/or other genes coding for 26 the proteins of the Reln intracellular cascade have been associated more or less substantially to 27 other conditions such as spinocerebellar ataxia type 7 and 37, VLDLR-associated cerebellar 28 hypoplasia, PAFAH1B1-associated lissencephaly, autism and schizophrenia. -
Cell Surface Mobility of GABAB Receptors Saad Bin
Cell surface mobility of GABAB receptors Saad Bin Hannan September 2011 A thesis submitted in fulfilment of the requirements for the degree of Doctor of Philosophy of the University College London Department of Neuroscience, Physiology, and Pharmacology University College London Gower Street London WC1E 6BT UK Declaration ii ‘I, Saad Hannan confirm that the work presented in this thesis is my own. Where information has been derived from other sources, I confirm that this has been indicated in the thesis.' ____________________ Saad Hannan September 2011 To Ammu, Abbu, Polu Abstract ivi Abstract Type-B γ-aminobutyric acid receptors (GABABRs) are important for mediating slow inhibition in the central nervous system and the kinetics of their internalisation and lateral mobility will be a major determinant of their signalling efficacy. Functional GABABRs require R1 and R2 subunit co-assembly, but how heterodimerisation affects the trafficking kinetics of GABABRs is unknown. Here, an α- bungarotoxin binding site (BBS) was inserted into the N-terminus of R2 to monitor receptor mobility in live cells. GABABRs are internalised via clathrin- and dynamin- dependent pathways and recruited to endosomes. By mutating the BBS, a new technique was developed to differentially track R1a and R2 simultaneously, revealing the subunits internalise as heteromers and that R2 dominantly-affects constitutive internalisation of GABABRs. Notably, the internalisation profile of R1aR2 heteromers, but not R1a homomers devoid of their ER retention motif (R1ASA), is similar to R2 homomers in heterologous systems. The internalisation of R1aASA was slowed to that of R2 by mutating a di-leucine motif in the R1 C-terminus, indicating a new role for heterodimerisation, whereby R2 subunits slow the internalization of surface GABABRs. -
The Interplay Between Neurons and Glia in Synapse Development And
Available online at www.sciencedirect.com ScienceDirect The interplay between neurons and glia in synapse development and plasticity Jeff A Stogsdill and Cagla Eroglu In the brain, the formation of complex neuronal networks and regulate distinct aspects of synaptic development and amenable to experience-dependent remodeling is complicated circuit connectivity. by the diversity of neurons and synapse types. The establishment of a functional brain depends not only on The intricate communication between neurons and glia neurons, but also non-neuronal glial cells. Glia are in and their cooperative roles in synapse formation are now continuous bi-directional communication with neurons to direct coming to light due in large part to advances in genetic the formation and refinement of synaptic connectivity. This and imaging tools. This article will examine the progress article reviews important findings, which uncovered cellular made in our understanding of the role of mammalian and molecular aspects of the neuron–glia cross-talk that perisynaptic glia (astrocytes and microglia) in synapse govern the formation and remodeling of synapses and circuits. development, maturation, and plasticity since the previ- In vivo evidence demonstrating the critical interplay between ous Current Opinion article [1]. An integration of past and neurons and glia will be the major focus. Additional attention new findings of glial control of synapse development and will be given to how aberrant communication between neurons plasticity is tabulated in Box 1. and glia may contribute to neural pathologies. Address Glia control the formation of synaptic circuits Department of Cell Biology, Duke University Medical Center, Durham, In the CNS, glial cells are in tight association with NC 27710, USA synapses in all brain regions [2]. -
The Ras1–Mitogen-Activated Protein Kinase Signal Transduction Pathway Regulates Synaptic Plasticity Through Fasciclin II-Mediated Cell Adhesion
The Journal of Neuroscience, April 1, 2002, 22(7):2496–2504 The Ras1–Mitogen-Activated Protein Kinase Signal Transduction Pathway Regulates Synaptic Plasticity through Fasciclin II-Mediated Cell Adhesion Young-Ho Koh, Catalina Ruiz-Canada, Michael Gorczyca, and Vivian Budnik Department of Biology, Neuroscience and Behavior Program, University of Massachusetts, Amherst, Massachusetts 01003 Ras proteins are small GTPases with well known functions in junction, and modification of their activity levels results in an cell proliferation and differentiation. In these processes, they altered number of synaptic boutons. Gain- or loss-of-function play key roles as molecular switches that can trigger distinct mutations in Ras1 and MAPK reveal that regulation of synapse signal transduction pathways, such as the mitogen-activated structure by this signal transduction pathway is dependent on protein kinase (MAPK) pathway, the phosphoinositide-3 kinase fasciclin II localization at synaptic boutons. These results pro- pathway, and the Ral–guanine nucleotide dissociation stimula- vide evidence for a Ras-dependent signaling cascade that tor pathway. Several studies have implicated Ras proteins in regulates fasciclin II-mediated cell adhesion at synaptic termi- the development and function of synapses, but the molecular nals during synapse growth. mechanisms for this regulation are poorly understood. Here, we demonstrate that the Ras–MAPK pathway is involved in syn- Key words: mitogen-activated protein kinase; Ras; neuro- aptic plasticity at the Drosophila larval neuromuscular junction. muscular junction; internalization; cell adhesion; synapse Both Ras1 and MAPK are expressed at the neuromuscular plasticity Synapse formation and modification are highly complex processes The Drosophila neuromuscular junction (NMJ) is a powerful that include the activation of gene expression, cytoskeletal reor- system to understand the mechanisms underlying synaptic plas- ganization, and signal transduction activation (Koh et al., 2000; ticity. -
FIRST PROOF Cerebellum
Article Number : EONS : 0736 GROSS ANATOMY Cerebellum Cortex The cerebellar cortex is an extensive three-layered sheet with a surface approximately 15 cm laterally THE HUMAN CEREBELLUM (‘‘little brain’’) is a and 180 cm rostrocaudally but densely folded around significant part of the central nervous system both three pairs of nuclei. The cortex is divided into three in size and in neural structure. It occupies approxi- transverse lobes: Anterior and posterior lobes are mately one-tenth of the cranial cavity, sitting astride separated by the primary fissure, and the smaller the brainstem, beneath the occipital cortex, and flocculonodular lobe is separated by the poster- contains more neurons than the whole of the cerebral olateral fissure (Fig. 1). The anterior and posterior cortex. It consists of an extensive cortical sheet, lobes are folded into a number of lobules and further densely folded around three pairs of nuclei. The folded into a series of folia. This transverse organiza- cortex contains only five main neural cell types and is tion is then divided at right angles into broad one of the most regular and uniform structures in the longitudinal regions. The central vermis, named for central nervous system (CNS), with an orthogonal its worm-like appearance, is most obvious in the ‘‘crystalline’’ organization. Major connections are posterior lobe. On either side is the paravermal or made to and from the spinal cord, brainstem, and intermediate cortex, which merges into the lateral sensorimotor areas of the cerebral cortex. hemispheres. The most common causes of damage to the cerebellum are stroke, tumors, or multiple sclerosis. -
Three-Dimensional Comparison of Ultrastructural Characteristics at Depressing and Facilitating Synapses Onto Cerebellar Purkinje Cells
The Journal of Neuroscience, September 1, 2001, 21(17):6666–6672 Three-Dimensional Comparison of Ultrastructural Characteristics at Depressing and Facilitating Synapses onto Cerebellar Purkinje Cells Matthew A. Xu-Friedman,1 Kristen M. Harris,2 and Wade G. Regehr1 1Department of Neurobiology, Harvard Medical School, Boston, Massachusetts 02115, and 2Department of Biology, Boston University, Boston, Massachusetts 02215 Cerebellar Purkinje cells receive two distinctive types of exci- vesicles per release site to test whether this number determines tatory inputs. Climbing fiber (CF) synapses have a high proba- the probability of release and synaptic plasticity. PF and CF bility of release and show paired-pulse depression (PPD), synapses had the same number of anatomically docked vesi- whereas parallel fiber (PF) synapses facilitate and have a low cles (7–8). The number of docked vesicles at the CF does not probability of release. We examined both types of synapses support a simple model of PPD in which release of a single using serial electron microscopic reconstructions in 15-d-old vesicle during the first pulse depletes the anatomically docked rats to look for anatomical correlates of these differences. PF vesicle pool at a synapse. Alternatively, only a fraction of ana- and CF synapses were distinguishable by their overall ultra- tomically docked vesicles may be release ready, or PPD could structural organization. There were differences between PF and result from multivesicular release at each site. Similarities in the CF synapses in how many release sites were within 1 mofa number of docked vesicles for PF and CF synapses indicate mitochondrion (67 vs 84%) and in the degree of astrocytic that differences in probability of release are unrelated to the ensheathment (67 vs 94%). -
IBENS - Institut De Biologie De L’École Normale Supérieure Rapport Hcéres
IBENS - Institut de biologie de l’école Normale Supérieure Rapport Hcéres To cite this version: Rapport d’évaluation d’une entité de recherche. IBENS - Institut de biologie de l’école Normale Supérieure. 2013, École normale supérieure - ENS, Centre national de la recherche scientifique - CNRS, Institut national de la santé et de la recherche médicale - INSERM. hceres-02031420 HAL Id: hceres-02031420 https://hal-hceres.archives-ouvertes.fr/hceres-02031420 Submitted on 20 Feb 2019 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Department for the evaluation of research units AERES report on unit: Institut de Biologie de l’Ecole Normale Supérieure IBENS Under the supervision of the following institutions and research bodies: Ecole Normale Supérieure Institut national de la santé et de la recherche médicale Centre National de la Recherche Scientifique January 2013 Research Units Department The president of AERES "signs[...], the evaluation reports, [...]countersigned for each evaluation department by the relevant head of department (Article 9, paragraph 3, of french decree n°2006-1334 dated 3 november 2006, revised). Institut de Biologie de l’ENS, IBENS, INSERM, CNRS and ENS, Mr Antoine TRILLER Grading Once the visits for the 2012-2013 evaluation campaign had been completed, the chairpersons of the expert committees, who met per disciplinary group, proceeded to attribute a score to the research units in their group (and, when necessary, for these units’ in-house teams).