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Developmental Plasticity of the Glutamate Synapse: Roles of Low Frequency Stimulation, Hebbian Induction and the Nmda Receptor
DEVELOPMENTAL PLASTICITY OF THE GLUTAMATE SYNAPSE: ROLES OF LOW FREQUENCY STIMULATION, HEBBIAN INDUCTION AND THE NMDA RECEPTOR Akademisk avhandling som för avläggande av medicine doktorsexamen vid Sahlgrenska akademin vid Göteborgs universitet kommer att offentligen försvaras i hörsal 2119, Hus 2, Hälsovetarbacken Göteborg, fredagen den 12 februari 2010 kl 09.00 av Joakim Strandberg Fakultetsopponent: Professor Martin Garwicz Institutionen för experimentell medicinsk vetenskap Lunds universitet Avhandlingen baseras på följande delarbeten: I. Strandberg J., Wasling P. and Gustafsson B. Modulation of low frequency induced synaptic depression in the developing CA3-CA1 hippocampal synapses by NMDA and metabotropic glutamate receptor activation. Journal of Neurophysiology (2009) 101:2252-2262 II. Strandberg J. and Gustafsson B. Lasting activity-induced depression of previously non-stimulated CA3-CA1 synapses in the developing hippocampus; critical and complex role of NMDA receptors. In manuscript III. Strandberg J. and Gustafsson B. Hebbian activity does not stabilize synaptic transmission at CA3-CA1 synapses in the developing hippocampus. In manuscript Göteborg 2010 DEVELOPMENTAL PLASTICITY OF THE GLUTAMATE SYNAPSE: ROLES OF LOW FREQUENCY STIMULATION, HEBBIAN INDUCTION AND THE NMDA RECEPTOR Joakim Strandberg Department of Physiology, Institute of Neuroscience and Physiology, Univeristy of Gothenburg, Sweden, 2010 Abstract The glutamate synapse is by far the most common synapse in the brain and acts via postsynaptic AMPA, NMDA and mGlu receptors. During brain development there is a continuous production of these synapses where those partaking in activity resulting in neuronal activity are subsequently selected to establish an appropriate functional pattern of synaptic connectivity while those that do not are elimimated. Activity dependent synaptic plasticities, such as Hebbian induced long-term potentiation (LTP) and low frequency (1 Hz) induced long-term depression (LTD) have been considered to be of critical importance for this selection. -
Specific Involvement of Postsynaptic Glun2b- Containing NMDA
Specific involvement of postsynaptic GluN2B- containing NMDA receptors in the developmental elimination of corticospinal synapses Takae Ohnoa, Hitoshi Maedaa, Naoyuki Murabea, Tsutomu Kamiyamaa, Noboru Yoshiokaa, Masayoshi Mishinab, and Masaki Sakuraia,1 aDepartment of Physiology, School of Medicine, Teikyo University, Tokyo 173-8605, Japan; and bDepartment of Molecular Neurobiology and Pharmacology, Graduate School of Medicine, University of Tokyo, Tokyo 113-8655, Japan Edited* by Masao Ito, RIKEN Brain Science Institute, Wako, Japan, and approved July 19, 2010 (received for review July 15, 2009) The GluN2B (GluRε2/NR2B) and GluN2A (GluRε1/NR2A) NMDA re- spinal gray matter at 7 d in vitro (DIV) but the synapses on the ceptor (NMDAR) subtypes have been differentially implicated in ventral side were subsequently eliminated through a process that activity-dependent synaptic plasticity. However, little is known was blocked by an NMDAR antagonist (22, 23). This type of about the respective contributions made by these two subtypes synapse elimination was also seen in vivo in the rat and followed to developmental plasticity, in part because studies of GluN2B KO a time course similar to that seen in vitro (24), and similar − − − − [Grin2b / (2b / )] mice are hampered by early neonatal mortality. elimination of synapses from ventral areas of the SpC during We previously used in vitro slice cocultures of rodent cerebral development has also been observed in cats (reviewed in ref. 25). cortex (Cx) and spinal cord (SpC) to show that corticospinal (CS) Those findings, together with the observation that the major synapses, once present throughout the SpC, are eliminated from NMDAR subunit mediating CS excitatory postsynaptic currents the ventral side during development in an NMDAR-dependent (EPSCs) appears to shift from 2B to 2A early during development manner. -
Gut Microbiota and Neuroplasticity
cells Review Gut Microbiota and Neuroplasticity Julia Murciano-Brea 1,2, Martin Garcia-Montes 1,2, Stefano Geuna 3 and Celia Herrera-Rincon 1,2,* 1 Department of Biodiversity, Ecology & Evolution, Biomathematics Unit, Complutense University of Madrid, 28040 Madrid, Spain; [email protected] (J.M.-B.); [email protected] (M.G.-M.) 2 Modeling, Data Analysis and Computational Tools for Biology Research Group, Complutense University of Madrid, 28040 Madrid, Spain 3 Department of Clinical and Biological Sciences, School of Medicine, University of Torino, 10124 Torino, Italy; [email protected] * Correspondence: [email protected]; Tel.: +34-91394-4888 Abstract: The accumulating evidence linking bacteria in the gut and neurons in the brain (the microbiota–gut–brain axis) has led to a paradigm shift in the neurosciences. Understanding the neurobiological mechanisms supporting the relevance of actions mediated by the gut microbiota for brain physiology and neuronal functioning is a key research area. In this review, we discuss the literature showing how the microbiota is emerging as a key regulator of the brain’s function and behavior, as increasing amounts of evidence on the importance of the bidirectional communication between the intestinal bacteria and the brain have accumulated. Based on recent discoveries, we suggest that the interaction between diet and the gut microbiota, which might ultimately affect the brain, represents an unprecedented stimulus for conducting new research that links food and mood. We also review the limited work in the clinical arena to date, and we propose novel approaches for deciphering the gut microbiota–brain axis and, eventually, for manipulating this relationship to boost mental wellness. -
A Review of Glutamate Receptors I: Current Understanding of Their Biology
J Toxicol Pathol 2008; 21: 25–51 Review A Review of Glutamate Receptors I: Current Understanding of Their Biology Colin G. Rousseaux1 1Department of Pathology and Laboratory Medicine, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada Abstract: Seventy years ago it was discovered that glutamate is abundant in the brain and that it plays a central role in brain metabolism. However, it took the scientific community a long time to realize that glutamate also acts as a neurotransmitter. Glutamate is an amino acid and brain tissue contains as much as 5 – 15 mM glutamate per kg depending on the region, which is more than of any other amino acid. The main motivation for the ongoing research on glutamate is due to the role of glutamate in the signal transduction in the nervous systems of apparently all complex living organisms, including man. Glutamate is considered to be the major mediator of excitatory signals in the mammalian central nervous system and is involved in most aspects of normal brain function including cognition, memory and learning. In this review, the basic biology of the excitatory amino acids glutamate, glutamate receptors, GABA, and glycine will first be explored. In the second part of this review, the known pathophysiology and pathology will be described. (J Toxicol Pathol 2008; 21: 25–51) Key words: glutamate, glycine, GABA, glutamate receptors, ionotropic, metabotropic, NMDA, AMPA, review Introduction and Overview glycine), peptides (vasopressin, somatostatin, neurotensin, etc.), and monoamines (norepinephrine, dopamine and In the first decades of the 20th century, research into the serotonin) plus acetylcholine. chemical mediation of the “autonomous” (autonomic) Glutamatergic synaptic transmission in the mammalian nervous system (ANS) was an area that received much central nervous system (CNS) was slowly established over a research activity. -
Metaplasticity of Mossy Fiber Synaptic Transmission Involves Altered Release Probability
The Journal of Neuroscience, May 1, 2000, 20(9):3434–3441 Metaplasticity of Mossy Fiber Synaptic Transmission Involves Altered Release Probability Ivan V. Goussakov,1 Klaus Fink,2 Christian E. Elger,1 and Heinz Beck1 1Department of Epileptology, University of Bonn, 53105 Bonn, Germany, and 2Department of Pharmacology, University of Bonn, 53113 Bonn, Germany Activity-dependent synaptic plasticity is a fundamental feature but not in kainate-treated animals, indicating that status- of CNS synapses. Intriguingly, the capacity of synapses to induced changes occur downstream of protein kinase A. To test express plastic changes is itself subject to considerable whether altered neurotransmitter release might account for activity-dependent variation, or metaplasticity. These forms of these changes, we measured the size of the releasable pool of higher order plasticity are important because they may be glutamate in mossy fiber terminals. We find that the size of the crucial to maintain synapses within a dynamic functional range. releasable pool of glutamate was significantly increased in In this study, we asked whether neuronal activity induced in vivo kainate-treated rats, indicating an increased release probability by application of kainate can induce lasting changes in mossy at the mossy fiber-CA3 synapse. fiber short- and long-term plasticity. Therefore, we suggest that lasting changes in neurotransmit- Several weeks after kainate-induced status epilepticus, the ter release probability caused by neuronal activity may be a mossy fiber, but not the associational-commissural pathway, powerful mechanism for metaplasticity that modulates both exhibits a marked loss of paired-pulse facilitation, augmenta- short- and long-term plasticity in the mossy fiber-CA3 synapse tion, and long-term potentiation (LTP). -
Unconventional NMDA Receptor Signaling
10800 • The Journal of Neuroscience, November 8, 2017 • 37(45):10800–10807 Symposium Unconventional NMDA Receptor Signaling X Kim Dore,1 Ivar S. Stein,2 XJennifer A. Brock,3,4 XPablo E. Castillo,5 XKaren Zito,2 and XP. Jesper Sjo¨stro¨m4 1Department of Neuroscience and Section for Neurobiology, Division of Biology, Center for Neural Circuits and Behavior, University of California, San Diego, California 92093, 2Center for Neuroscience, University of California, Davis, California 95618, 3Integrated Program in Neuroscience, McGill University, Montreal, Quebec H3A 2B4, Canada, 4Centre for Research in Neuroscience, Brain Repair and Integrative Neuroscience Programme, Department of Neurology and Neurosurgery, Research Institute of the McGill University Health Centre, Montreal General Hospital, Montreal, Quebec H3G 1A4, Canada, and 5Dominick P. Purpura Department of Neuroscience, Albert Einstein College of Medicine, Bronx, New York 10461 In the classical view, NMDA receptors (NMDARs) are stably expressed at the postsynaptic membrane, where they act via Ca 2ϩ to signal coincidence detection in Hebbian plasticity. More recently, it has been established that NMDAR-mediated transmission can be dynam- ically regulated by neural activity. In addition, NMDARs have been found presynaptically, where they cannot act as conventional coin- cidence detectors. Unexpectedly, NMDARs have also been shown to signal metabotropically, without the need for Ca 2ϩ. This review highlights novel findings concerning these unconventional modes of NMDAR action. Key words: -
Activity-Dependent Metaplasticity of Inhibitory and Excitatory Synaptic Transmission in the Lamprey Spinal Cord Locomotor Network
The Journal of Neuroscience, March 1, 1999, 19(5):1647–1656 Activity-Dependent Metaplasticity of Inhibitory and Excitatory Synaptic Transmission in the Lamprey Spinal Cord Locomotor Network David Parker and Sten Grillner Nobel Institute for Neurophysiology, Department of Neuroscience, Karolinska Institute, S-17177, Stockholm, Sweden Paired intracellular recordings have been used to examine the activity-dependent plasticity will presumably not contribute to activity-dependent plasticity and neuromodulator-induced the patterning of network activity. However, in the presence of metaplasticity of synaptic inputs from identified inhibitory and the neuromodulators substance P and 5-HT, significant activity- excitatory interneurons in the lamprey spinal cord. Trains of dependent metaplasticity of these inputs developed over the spikes at 5–20 Hz were used to mimic the frequency of spiking first five spikes in the train. Substance P induced significant that occurs in network interneurons during NMDA or brainstem- activity-dependent depression of inhibitory but potentiation of evoked locomotor activity. Inputs from inhibitory and excitatory excitatory interneuron inputs, whereas 5-HT induced significant interneurons exhibited similar activity-dependent changes, with activity-dependent potentiation of both inhibitory and excita- synaptic depression developing during the spike train. The level tory interneuron inputs. Because these metaplastic effects are of depression reached was greater with lower stimulation fre- consistent with the substance P and 5-HT-induced modulation quencies. Significant activity-dependent depression of inputs of the network output, activity-dependent metaplasticity could from excitatory interneurons and inhibitory crossed caudal in- be a potential mechanism underlying the coordination and terneurons, which are central elements in the patterning of modulation of rhythmic network activity. -
Synaptogenesis and Development of Pyramidal Neuron Dendritic Morphology in the Chimpanzee Neocortex Resembles Humans
Synaptogenesis and development of pyramidal neuron dendritic morphology in the chimpanzee neocortex resembles humans Serena Bianchia,1,2, Cheryl D. Stimpsona,1, Tetyana Dukaa, Michael D. Larsenb, William G. M. Janssenc, Zachary Collinsa, Amy L. Bauernfeinda, Steven J. Schapirod, Wallace B. Bazed, Mark J. McArthurd, William D. Hopkinse,f, Derek E. Wildmang, Leonard Lipovichg, Christopher W. Kuzawah, Bob Jacobsi, Patrick R. Hofc,j, and Chet C. Sherwooda,2 aDepartment of Anthropology, The George Washington University, Washington, DC 20052; bDepartment of Statistics and Biostatistics Center, The George Washington University, Rockville, MD 20852; cFishberg Department of Neuroscience and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029; dDepartment of Veterinary Sciences, The University of Texas MD Anderson Cancer Center, Bastrop, TX 78602; eNeuroscience Institute and Language Research Center, Georgia State University, Atlanta, GA 30302; fDivision of Developmental and Cognitive Neuroscience, Yerkes National Primate Research Center, Atlanta, GA 30322; gCenter for Molecular Medicine and Genetics, Wayne State University, Detroit, MI 48201; hDepartment of Anthropology, Northwestern University, Evanston, IL 60208; iDepartment of Psychology, Colorado College, Colorado Springs, CO 80903; and jNew York Consortium in Evolutionary Primatology, New York, NY 10024 Edited by Francisco J. Ayala, University of California, Irvine, CA, and approved April 18, 2013 (received for review February 13, 2013) Neocortical development in humans is characterized by an ex- humans only ∼25% of adult mass is achieved at birth (8). Con- tended period of synaptic proliferation that peaks in mid-child- comitantly, the postnatal refinement of cortical microstructure in hood, with subsequent pruning through early adulthood, as well humans progresses along a more protracted schedule relative to as relatively delayed maturation of neuronal arborization in the macaques. -
Multiple Periods of Functional Ocular Dominance Plasticity in Mouse Visual Cortex
ARTICLES Multiple periods of functional ocular dominance plasticity in mouse visual cortex Yoshiaki Tagawa1,2,3, Patrick O Kanold1,3, Marta Majdan1 & Carla J Shatz1 The precise period when experience shapes neural circuits in the mouse visual system is unknown. We used Arc induction to monitor the functional pattern of ipsilateral eye representation in cortex during normal development and after visual deprivation. After monocular deprivation during the critical period, Arc induction reflects ocular dominance (OD) shifts within the binocular zone. Arc induction also reports faithfully expected OD shifts in cat. Shifts towards the open eye and weakening of the deprived eye were seen in layer 4 after the critical period ends and also before it begins. These shifts include an unexpected spatial expansion of Arc induction into the monocular zone. However, this plasticity is not present in adult layer 6. Thus, functionally assessed OD can be altered in cortex by ocular imbalances substantially earlier and far later than expected. http://www.nature.com/natureneuroscience Sensory experience can modify structural and functional connectiv- been studied extensively. Here, a functional technique based on in situ ity in cortex1,2. Many previous studies of highly binocular animals hybridization for the immediate early gene Arc16 is used to investigate have led to the current consensus that visual experience is required for pathways representing the ipsilateral eye in developing and adult mouse maintenance of precise connections in the developing visual cortex and visual cortex and after visual deprivation. We find multiple periods of that competition-based mechanisms underlie ocular dominance (OD) susceptibility to visual deprivation in mouse visual cortex. -
Governs the Making of Photocopies Or Other Reproductions of Copyrighted Materials
Warning Concerning Copyright Restrictions The Copyright Law of the United States (Title 17, United States Code) governs the making of photocopies or other reproductions of copyrighted materials. Under certain conditions specified in the law, libraries and archives are authorized to furnish a photocopy or other reproduction. One of these specified conditions is that the photocopy or reproduction is not to be used for any purpose other than private study, scholarship, or research. If electronic transmission of reserve material is used for purposes in excess of what constitutes "fair use," that user may be liable for copyright infringement. University of Nevada, Reno Non-Ionotropic Activation of the NMDAR, Leading to ERK 1/2 Phosphorylation A thesis submitted in partial fulfillment of the requirements for the degree of Bachelor of Science in Neuroscience and the Honors Program by Melissa Slocumb Dr. Robert Renden, Thesis Advisor December, 2013 2 UNIVERSITY OF NEVADA THE HONORS PROGRAM RENO We recommend that the thesis prepared under our supervision by MELISSA SLOCUMB entitled Non-Ionotropic Activation of the NMDAR, Leading to ERK 1/2 Phosphorylation be accepted in partial fulfillment of the requirements for the degree of BACHELOR OF SCIENCE IN NEUROSCIENCE ______________________________________________ Robert Renden, Ph. D., Thesis Advisor ______________________________________________ Tamara Valentine, Ph. D., Director, Honors Program December, 2013 Abstract ii N-methyl-D-aspartate receptors (NMDARs) are important to neuron function. NMDARs are transmembrane ligand-gated and voltage-gated ion channels that pass sodium, potassium, and calcium (MacDermott et al., 1986). They are composed of a tetramer of proteins in the postsynaptic cell membrane of neurons. -
Diverse Impact of Acute and Long-Term Extracellular Proteolytic Activity on Plasticity of Neuronal Excitability
REVIEW published: 10 August 2015 doi: 10.3389/fncel.2015.00313 Diverse impact of acute and long-term extracellular proteolytic activity on plasticity of neuronal excitability Tomasz Wójtowicz 1*, Patrycja Brzda, k 2 and Jerzy W. Mozrzymas 1,2 1 Laboratory of Neuroscience, Department of Biophysics, Wroclaw Medical University, Wroclaw, Poland, 2 Department of Animal Physiology, Institute of Experimental Biology, Wroclaw University, Wroclaw, Poland Learning and memory require alteration in number and strength of existing synaptic connections. Extracellular proteolysis within the synapses has been shown to play a pivotal role in synaptic plasticity by determining synapse structure, function, and number. Although synaptic plasticity of excitatory synapses is generally acknowledged to play a crucial role in formation of memory traces, some components of neural plasticity are reflected by nonsynaptic changes. Since information in neural networks is ultimately conveyed with action potentials, scaling of neuronal excitability could significantly enhance or dampen the outcome of dendritic integration, boost neuronal information storage capacity and ultimately learning. However, the underlying mechanism is poorly understood. With this regard, several lines of evidence and our most recent study support a view that activity of extracellular proteases might affect information processing Edited by: Leszek Kaczmarek, in neuronal networks by affecting targets beyond synapses. Here, we review the most Nencki Institute, Poland recent studies addressing the impact of extracellular proteolysis on plasticity of neuronal Reviewed by: excitability and discuss how enzymatic activity may alter input-output/transfer function Ania K. Majewska, University of Rochester, USA of neurons, supporting cognitive processes. Interestingly, extracellular proteolysis may Anna Elzbieta Skrzypiec, alter intrinsic neuronal excitability and excitation/inhibition balance both rapidly (time of University of Exeter, UK minutes to hours) and in long-term window. -
LTP, STP, and Scaling: Electrophysiological, Biochemical, and Structural Mechanisms
This position paper has not been peer reviewed or edited. It will be finalized, reviewed and edited after the Royal Society meeting on ‘Integrating Hebbian and homeostatic plasticity’ (April 2016). LTP, STP, and scaling: electrophysiological, biochemical, and structural mechanisms John Lisman, Dept. Biology, Brandeis University, Waltham Ma. [email protected] ABSTRACT: Synapses are complex because they perform multiple functions, including at least six mechanistically different forms of plasticity (STP, early LTP, late LTP, LTD, distance‐dependent scaling, and homeostatic scaling). The ultimate goal of neuroscience is to provide an electrophysiologically, biochemically, and structurally specific explanation of the underlying mechanisms. This review summarizes the still limited progress towards this goal. Several areas of particular progress will be highlighted: 1) STP, a Hebbian process that requires small amounts of synaptic input, appears to make strong contributions to some forms of working memory. 2) The rules for LTP induction in the stratum radiatum of the hippocampus have been clarified: induction does not depend obligatorily on backpropagating Na spikes but, rather, on dendritic branch‐specific NMDA spikes. Thus, computational models based on STDP need to be modified. 3) Late LTP, a process that requires a dopamine signal (neoHebbian), is mediated by trans‐ synaptic growth of the synapse, a growth that occurs about an hour after LTP induction. 4) There is no firm evidence for cell‐autonomous homeostatic synaptic scaling; rather, homeostasis is likely to depend on a) cell‐autonomous processes that are not scaling, b) synaptic scaling that is not cell autonomous but instead depends on population activity, or c) metaplasticity processes that change the propensity of LTP vs LTD.