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Zhou J, Li X, Wang X, Yang Y, Nai A, Shi H, Zhao J, Zhang J, Ding S, Han Y, Liu Q, Zhang L, Chen T, Liu B, Yue W, Lv L, Li W. Levels of neuronal pentraxin 2 in plasma is associated with cognitive function in patients with schizophrenia. Psychopharmacology (Berl) 2024; 241:865-874. [PMID: 38191677 DOI: 10.1007/s00213-023-06515-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 12/01/2023] [Indexed: 01/10/2024]
Abstract
RATIONALE The precise diagnosis and treatment of cognitive impairment remains a major challenge in the field of schizophrenia (SCZ) research. Synaptic dysfunction and loss are thought to be closely related to the occurrence and development of SCZ and may be involved in cognitive dysfunction. OBJECTIVES The purpose of this study was to investigate whether neuronal pentraxins (NPTXs) plays a role in the etiology of SCZ and provide evidence of its possible therapeutic value a new target for drug development. METHODS We recruited 275 participants, of whom 148 were SCZ from psychiatric hospital and 127 healthy control (HC) subjects from communities. Plasma concentrations of NPTXs were measured in HC and SCZ at baseline and after 8 weeks of antipsychotic treatment. The MATRICS Cognitive Consensus Battery was used to evaluate cognitive function. Furthermore, the brain is parcellated into 246 subregions using the Brainnetome atlas, and we extracted regional white matter volumes from magnetic resonance images of the SCZ groups. RESULTS Plasma NPTX2 levels were significantly lower in SCZ compared with HC subjects, but were significantly raised in SCZ after 8 weeks of antipsychotic treatment compared to baseline. In addition, baseline plasma NPTX2 levels were positively correlated with cognitive performance. CONCLUSIONS These findings indicate that NPTX2 may reveal novel aspects of disease etiology and act as a promising target for new drug development.
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Affiliation(s)
- Jiahui Zhou
- Henan Mental Hospital, The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
- Henan Key Lab of Biological Psychiatry, Xinxiang Medical University, Xinxiang, China
- International Joint Research Laboratory for Psychiatry and Neuroscience of Henan, Xinxiang, China
| | - Xiaojing Li
- Henan Mental Hospital, The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
- Henan Key Lab of Biological Psychiatry, Xinxiang Medical University, Xinxiang, China
- International Joint Research Laboratory for Psychiatry and Neuroscience of Henan, Xinxiang, China
| | - Xiujuan Wang
- Henan Mental Hospital, The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
| | - Yongfeng Yang
- Henan Mental Hospital, The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
- Henan Key Lab of Biological Psychiatry, Xinxiang Medical University, Xinxiang, China
- International Joint Research Laboratory for Psychiatry and Neuroscience of Henan, Xinxiang, China
| | - Aoyang Nai
- Henan Mental Hospital, The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
| | - Han Shi
- Henan Mental Hospital, The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
| | - Jingyuan Zhao
- Henan Mental Hospital, The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
| | - Jianhong Zhang
- Henan Mental Hospital, The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
| | - Shuang Ding
- Henan Mental Hospital, The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
| | - Yong Han
- Henan Mental Hospital, The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
- Henan Key Lab of Biological Psychiatry, Xinxiang Medical University, Xinxiang, China
- International Joint Research Laboratory for Psychiatry and Neuroscience of Henan, Xinxiang, China
| | - Qing Liu
- Henan Mental Hospital, The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
- Henan Key Lab of Biological Psychiatry, Xinxiang Medical University, Xinxiang, China
- International Joint Research Laboratory for Psychiatry and Neuroscience of Henan, Xinxiang, China
| | - Luwen Zhang
- Henan Mental Hospital, The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
- Henan Key Lab of Biological Psychiatry, Xinxiang Medical University, Xinxiang, China
- International Joint Research Laboratory for Psychiatry and Neuroscience of Henan, Xinxiang, China
| | - Tengfei Chen
- Henan Mental Hospital, The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
- Henan Key Lab of Biological Psychiatry, Xinxiang Medical University, Xinxiang, China
- International Joint Research Laboratory for Psychiatry and Neuroscience of Henan, Xinxiang, China
| | - Bing Liu
- State Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University, Beijing, China
- Chinese Institute for Brain Research, Beijing, China
| | - Weihua Yue
- Institute of Mental Health, Peking University, Beijing, China
- Key Laboratory for Mental Health, Ministry of Health, Beijing, China
| | - Luxian Lv
- Henan Mental Hospital, The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China.
- Henan Key Lab of Biological Psychiatry, Xinxiang Medical University, Xinxiang, China.
- International Joint Research Laboratory for Psychiatry and Neuroscience of Henan, Xinxiang, China.
| | - Wenqiang Li
- Henan Mental Hospital, The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, China.
- Henan Key Lab of Biological Psychiatry, Xinxiang Medical University, Xinxiang, China.
- International Joint Research Laboratory for Psychiatry and Neuroscience of Henan, Xinxiang, China.
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Seewald A, Schönherr S, Hörtnagl H, Ehrlich I, Schmuckermair C, Ferraguti F. Fear Memory Retrieval Is Associated With a Reduction in AMPA Receptor Density at Thalamic to Amygdala Intercalated Cell Synapses. Front Synaptic Neurosci 2021; 13:634558. [PMID: 34295235 PMCID: PMC8290482 DOI: 10.3389/fnsyn.2021.634558] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2020] [Accepted: 06/14/2021] [Indexed: 12/12/2022] Open
Abstract
The amygdala plays a crucial role in attaching emotional significance to environmental cues. Its intercalated cell masses (ITC) are tight clusters of GABAergic neurons, which are distributed around the basolateral amygdala complex. Distinct ITC clusters are involved in the acquisition and extinction of conditioned fear responses. Previously, we have shown that fear memory retrieval reduces the AMPA/NMDA ratio at thalamic afferents to ITC neurons within the dorsal medio-paracapsular cluster. Here, we investigate the molecular mechanisms underlying the fear-mediated reduction in the AMPA/NMDA ratio at these synapses and, in particular, whether specific changes in the synaptic density of AMPA receptors underlie the observed change. To this aim, we used a detergent-digested freeze-fracture replica immunolabeling technique (FRIL) approach that enables to visualize the spatial distribution of intrasynaptic AMPA receptors at high resolution. AMPA receptors were detected using an antibody raised against an epitope common to all AMPA subunits. To visualize thalamic inputs, we virally transduced the posterior thalamic complex with Channelrhodopsin 2-YFP, which is anterogradely transported along axons. Using face-matched replica, we confirmed that the postsynaptic elements were ITC neurons due to their prominent expression of μ-opioid receptors. With this approach, we show that, following auditory fear conditioning in mice, the formation and retrieval of fear memory is linked to a significant reduction in the density of AMPA receptors, particularly at spine synapses formed by inputs of the posterior intralaminar thalamic and medial geniculate nuclei onto identified ITC neurons. Our study is one of the few that has directly linked the regulation of AMPA receptor trafficking to memory processes in identified neuronal networks, by showing that fear-memory induced reduction in AMPA/NMDA ratio at thalamic-ITC synapses is associated with a reduced postsynaptic AMPA receptor density.
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Affiliation(s)
- Anna Seewald
- Department of Pharmacology, Medical University of Innsbruck, Innsbruck, Austria
| | - Sabine Schönherr
- Department of Pharmacology, Medical University of Innsbruck, Innsbruck, Austria
| | - Heide Hörtnagl
- Department of Pharmacology, Medical University of Innsbruck, Innsbruck, Austria
| | - Ingrid Ehrlich
- Center for Integrative Neuroscience, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany.,Department of Neurobiology, Institute of Biomaterials and Biomolecular Systems, University of Stuttgart, Stuttgart, Germany
| | | | - Francesco Ferraguti
- Department of Pharmacology, Medical University of Innsbruck, Innsbruck, Austria
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Jabeen S, Thirumalai V. The interplay between electrical and chemical synaptogenesis. J Neurophysiol 2018; 120:1914-1922. [PMID: 30067121 PMCID: PMC6230774 DOI: 10.1152/jn.00398.2018] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Neurons communicate with each other via electrical or chemical synaptic connections. The pattern and strength of connections between neurons are critical for generating appropriate output. What mechanisms govern the formation of electrical and/or chemical synapses between two neurons? Recent studies indicate that common molecular players could regulate the formation of both of these classes of synapses. In addition, electrical and chemical synapses can mutually coregulate each other’s formation. Electrical activity, generated spontaneously by the nervous system or initiated from sensory experience, plays an important role in this process, leading to the selection of appropriate connections and the elimination of inappropriate ones. In this review, we discuss recent studies that shed light on the formation and developmental interactions of chemical and electrical synapses.
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Affiliation(s)
- Shaista Jabeen
- National Centre for Biological Sciences, Tata Institute for Fundamental Research , Bangalore , India.,Manipal Academy of Higher Education, Madhav Nagar, Manipal , India
| | - Vatsala Thirumalai
- National Centre for Biological Sciences, Tata Institute for Fundamental Research , Bangalore , India
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Singh P, Thakur MK. Histone Deacetylase 2 Inhibition Attenuates Downregulation of Hippocampal Plasticity Gene Expression during Aging. Mol Neurobiol 2017; 55:2432-2442. [PMID: 28364391 DOI: 10.1007/s12035-017-0490-x] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Accepted: 03/14/2017] [Indexed: 12/31/2022]
Abstract
The brain undergoes several anatomical, biochemical, and molecular changes during aging, which subsequently result in downregulation of synaptic plasticity genes and decline of memory. However, the regulation of these genes during aging is not clearly understood. Previously, we reported that the expression of histone deacetylase (HDAC)2 was upregulated in the hippocampus of old mice and negatively correlated with the decline in recognition memory. As HDAC2 regulates key synaptic plasticity neuronal immediate early genes (IEGs), we have examined their expression and epigenetic regulation. We noted that the expression of neuronal IEGs decreased both at mRNA and protein level in the hippocampus of old mice. To explore the underlying regulation, we analyzed the binding of HDAC2 and level of histone acetylation at the promoter of neuronal IEGs. While the binding of HDAC2 was higher, H3K9 and H3K14 acetylation level was lower at the promoter of these genes in old as compared to young and adult mice. Further, we inhibited HDAC2 non-specifically by sodium butyrate and specifically by antisense oligonucleotide to recover epigenetic modification, expression of neuronal IEGs, and memory in old mice. Inhibition of HDAC2 increased histone H3K9 and H3K14 acetylation level at the promoter of neuronal IEGs, their expression, and recognition memory in old mice as compared to control. Thus, inhibition of HDAC2 can be used as a therapeutic target to recover decline in memory due to aging and associated neurological disorders.
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Affiliation(s)
- Padmanabh Singh
- Biochemistry and Molecular Biology Laboratory, Centre of Advanced Study, Department of Zoology, Institute of Science, Banaras Hindu University, Varanasi, 221 005, India
| | - M K Thakur
- Biochemistry and Molecular Biology Laboratory, Centre of Advanced Study, Department of Zoology, Institute of Science, Banaras Hindu University, Varanasi, 221 005, India.
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5
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Impaired hippocampal synaptic plasticity and NR2A/2B expression ratio in remifentanil withdrawal rats. Neurotoxicology 2016; 53:115-123. [PMID: 26777139 DOI: 10.1016/j.neuro.2016.01.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2015] [Revised: 12/05/2015] [Accepted: 01/09/2016] [Indexed: 11/20/2022]
Abstract
Remifentanil is a kind of synthetic opioid which has gained wide clinical acceptance by anesthesiologists. In this study, we attempted to test whether withdrawal effects on learning mechanisms can be triggered by repeated low-dose remifentanil treatment. Male Sprague-Dawley (SD) rats were subjected to remifentanil (50μg/kgs.c.) twice per day at 12h intervals for 15 days. When the animals of remifentanil group were withdrawn from remifentanil at 10h after the last injection, changes in open field test, Morris water maze test (MWM) and synaptic efficacy were examined in each group. We demonstrated that repeated exposure to 50μg/kg remifentanil produced enhanced locomotor activity indicating that a remifentanil addiction animal model in rats was established. MWM results showed that exposure to remifentanil had no influence on the spatial cognition. After withdrawal of remifentanil rats showed impaired spatial cognition. In electrophysiology test, remifentanil group rats showed a trend for a rightward shift of input/output relationship and significant deficits in maintenance of STP and LTP. Immunohistochemistry results demonstrated increased NR2A/NR2B ratio that should be included depression of LTP. In the whole-cell patch-clamp recording, after elimination from remifentanil incubation, mEPSC frequency was down regulated in hippocampal CA1 neurons, indicating that basal synaptic transmission were affected by remifentanil withdrawal. Taken together, the current findings demonstrate that the remifentanil withdrawn rats exhibit obvious impairment of hippocampus-dependent memory and synaptic plasticity. Increased hippocampal NR2A/NR2B expression ratio and the changes of basal synaptic transmission may participate in the impairment of LTP.
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6
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Pelkey KA, Barksdale E, Craig MT, Yuan X, Sukumaran M, Vargish GA, Mitchell RM, Wyeth MS, Petralia RS, Chittajallu R, Karlsson RM, Cameron HA, Murata Y, Colonnese MT, Worley PF, McBain CJ. Pentraxins coordinate excitatory synapse maturation and circuit integration of parvalbumin interneurons. Neuron 2015; 85:1257-72. [PMID: 25754824 DOI: 10.1016/j.neuron.2015.02.020] [Citation(s) in RCA: 143] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Revised: 12/05/2014] [Accepted: 02/04/2015] [Indexed: 10/23/2022]
Abstract
Circuit computation requires precision in the timing, extent, and synchrony of principal cell (PC) firing that is largely enforced by parvalbumin-expressing, fast-spiking interneurons (PVFSIs). To reliably coordinate network activity, PVFSIs exhibit specialized synaptic and membrane properties that promote efficient afferent recruitment such as expression of high-conductance, rapidly gating, GluA4-containing AMPA receptors (AMPARs). We found that PVFSIs upregulate GluA4 during the second postnatal week coincident with increases in the AMPAR clustering proteins NPTX2 and NPTXR. Moreover, GluA4 is dramatically reduced in NPTX2(-/-)/NPTXR(-/-) mice with consequent reductions in PVFSI AMPAR function. Early postnatal NPTX2(-/-)/NPTXR(-/-) mice exhibit delayed circuit maturation with a prolonged critical period permissive for giant depolarizing potentials. Juvenile NPTX2(-/-)/NPTXR(-/-) mice display reduced feedforward inhibition yielding a circuit deficient in rhythmogenesis and prone to epileptiform discharges. Our findings demonstrate an essential role for NPTXs in controlling network dynamics highlighting potential therapeutic targets for disorders with inhibition/excitation imbalances such as schizophrenia.
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Affiliation(s)
- Kenneth A Pelkey
- Program in Developmental Neuroscience, Eunice Kennedy-Shriver National Institute of Child Health and Human Development, National Institutes of Health, 35 Lincoln Drive, Bethesda, MD 20892, USA.
| | - Elizabeth Barksdale
- Program in Developmental Neuroscience, Eunice Kennedy-Shriver National Institute of Child Health and Human Development, National Institutes of Health, 35 Lincoln Drive, Bethesda, MD 20892, USA
| | - Michael T Craig
- Program in Developmental Neuroscience, Eunice Kennedy-Shriver National Institute of Child Health and Human Development, National Institutes of Health, 35 Lincoln Drive, Bethesda, MD 20892, USA
| | - Xiaoqing Yuan
- Program in Developmental Neuroscience, Eunice Kennedy-Shriver National Institute of Child Health and Human Development, National Institutes of Health, 35 Lincoln Drive, Bethesda, MD 20892, USA
| | - Madhav Sukumaran
- Program in Developmental Neuroscience, Eunice Kennedy-Shriver National Institute of Child Health and Human Development, National Institutes of Health, 35 Lincoln Drive, Bethesda, MD 20892, USA
| | - Geoffrey A Vargish
- Program in Developmental Neuroscience, Eunice Kennedy-Shriver National Institute of Child Health and Human Development, National Institutes of Health, 35 Lincoln Drive, Bethesda, MD 20892, USA
| | - Robert M Mitchell
- Program in Developmental Neuroscience, Eunice Kennedy-Shriver National Institute of Child Health and Human Development, National Institutes of Health, 35 Lincoln Drive, Bethesda, MD 20892, USA
| | - Megan S Wyeth
- Program in Developmental Neuroscience, Eunice Kennedy-Shriver National Institute of Child Health and Human Development, National Institutes of Health, 35 Lincoln Drive, Bethesda, MD 20892, USA
| | - Ronald S Petralia
- Advanced Imaging Core National Institute of Deafness and Other Communication Disorders, National Institutes of Health, 35 Lincoln Drive, Bethesda, MD 20892, USA
| | - Ramesh Chittajallu
- Program in Developmental Neuroscience, Eunice Kennedy-Shriver National Institute of Child Health and Human Development, National Institutes of Health, 35 Lincoln Drive, Bethesda, MD 20892, USA
| | - Rose-Marie Karlsson
- Section on Neuroplasticity, Mood and Anxiety Disorders Program, National Institute of Mental Health, National Institutes of Health, 35 Lincoln Drive, Bethesda, MD 20892, USA
| | - Heather A Cameron
- Section on Neuroplasticity, Mood and Anxiety Disorders Program, National Institute of Mental Health, National Institutes of Health, 35 Lincoln Drive, Bethesda, MD 20892, USA
| | - Yasunobu Murata
- Department of Pharmacology and Physiology, and Institute for Neuroscience, George Washington University, 2300 Eye Street, Washington, DC 20037, USA
| | - Matthew T Colonnese
- Department of Pharmacology and Physiology, and Institute for Neuroscience, George Washington University, 2300 Eye Street, Washington, DC 20037, USA
| | - Paul F Worley
- The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University, 725 N. Wolfe Street, Baltimore, MD 21205, USA
| | - Chris J McBain
- Program in Developmental Neuroscience, Eunice Kennedy-Shriver National Institute of Child Health and Human Development, National Institutes of Health, 35 Lincoln Drive, Bethesda, MD 20892, USA
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7
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Nishimune H. Transsynaptic channelosomes: non-conducting roles of ion channels in synapse formation. Channels (Austin) 2011; 5:432-9. [PMID: 21654201 PMCID: PMC3265764 DOI: 10.4161/chan.5.5.16472] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2011] [Revised: 04/14/2011] [Accepted: 04/14/2011] [Indexed: 11/19/2022] Open
Abstract
Recent findings demonstrate that synaptic channels are directly involved in the formation and maintenance of synapses by interacting with synapse organizers. The synaptic channels on the pre- and postsynaptic membranes possess non-conducting roles in addition to their functional roles as ion-conducting channels required for synaptic transmission. For example, presynaptic voltage-dependent calcium channels link the target-derived synapse organizer laminin β2 to cytomatrix of the active zone and function as scaffolding proteins to organize the presynaptic active zones. Furthermore, postsynaptic δ2-type glutamate receptors organize the synapses by forming transsynaptic protein complexes with presynaptic neurexins through synapse organizer cerebellin 1 precursor proteins. Interestingly, the synaptic clustering of AMPA receptors is regulated by neuronal activity-regulated pentraxins, while postsynaptic differentiation is induced by the interaction of postsynaptic calcium channels and thrombospondins. This review will focus on the non-conducting functions of ion-channels that contribute to the synapse formation in concert with synapse organizers and active-zone-specific proteins.
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Affiliation(s)
- Hiroshi Nishimune
- Department of Anatomy and Cell Biology, Kansas Intellectual and Developmental Disabilities Research Center, University of Kansas Medical School, Kansas City, KS, USA.
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8
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Leslie JH, Nedivi E. Activity-regulated genes as mediators of neural circuit plasticity. Prog Neurobiol 2011; 94:223-37. [PMID: 21601615 DOI: 10.1016/j.pneurobio.2011.05.002] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2010] [Revised: 05/03/2011] [Accepted: 05/05/2011] [Indexed: 10/18/2022]
Abstract
Modifications of neuronal circuits allow the brain to adapt and change with experience. This plasticity manifests during development and throughout life, and can be remarkably long lasting. Evidence has linked activity-regulated gene expression to the long-term structural and electrophysiological adaptations that take place during developmental critical periods, learning and memory, and alterations to sensory map representations in the adult. In all these cases, the cellular response to neuronal activity integrates multiple tightly coordinated mechanisms to precisely orchestrate long-lasting, functional and structural changes in brain circuits. Experience-dependent plasticity is triggered when neuronal excitation activates cellular signaling pathways from the synapse to the nucleus that initiate new programs of gene expression. The protein products of activity-regulated genes then work via a diverse array of cellular mechanisms to modify neuronal functional properties. Synaptic strengthening or weakening can reweight existing circuit connections, while structural changes including synapse addition and elimination create new connections. Posttranscriptional regulatory mechanisms, often also dependent on activity, further modulate activity-regulated gene transcript and protein function. Thus, activity-regulated genes implement varied forms of structural and functional plasticity to fine-tune brain circuit wiring.
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Affiliation(s)
- Jennifer H Leslie
- Department of Biology, Picower Institute for Learning and Memory, Massachusetts Institute of Technology, Cambridge, MA 02139, United States
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Narp regulates homeostatic scaling of excitatory synapses on parvalbumin-expressing interneurons. Nat Neurosci 2010; 13:1090-7. [PMID: 20729843 PMCID: PMC2949072 DOI: 10.1038/nn.2621] [Citation(s) in RCA: 219] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2010] [Accepted: 07/22/2010] [Indexed: 01/22/2023]
Abstract
Homeostatic synaptic scaling alters the strength of synapses to compensate for prolonged changes in network activity, and involves both excitatory and inhibitory neurons. The immediate-early gene termed Narp (Neuronal activity-regulated pentraxin) encodes a secreted synaptic protein that can bind and cluster AMPA receptors (AMPARs). Here, we report that Narp prominently accumulates at excitatory synapses on Parvalbumin-expressing interneurons (PV-INs). Increasing network activity results in a homeostatic increase of excitatory synaptic strength onto PV-INs that increases inhibitory drive, and this response is absent in neurons cultured from Narp knock-out (Narp−/−) mice. Activity-dependent changes in the strength of excitatory inputs on PV-INs in acute hippocampal slices are also dependent on Narp, and Narp−/− mice display increased sensitivity to kindling-induced seizures. We propose that Narp recruits AMPARs at excitatory synapses onto PV-INs to rebalance network excitation/inhibition dynamics following episodes of increased circuit activity.
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Jacob AL, Jordan BA, Weinberg RJ. Organization of amyloid-beta protein precursor intracellular domain-associated protein-1 in the rat brain. J Comp Neurol 2010; 518:3221-36. [PMID: 20575057 PMCID: PMC2894292 DOI: 10.1002/cne.22394] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Sustained activity-dependent synaptic modifications require protein synthesis. Although proteins can be synthesized locally in dendrites, long-term changes also require nuclear signaling. Amyloid-beta protein precursor intracellular domain-associated protein-1 (AIDA-1), an abundant component of the biochemical postsynaptic density fraction, contains a nuclear localization sequence, making it a plausible candidate for synapse-to-nucleus signaling. We used immunohistochemistry to study the regional, cellular, and subcellular distribution of AIDA-1. Immunostaining was prominent in the hippocampus, cerebral cortex, and neostriatum. Along with diffuse staining of neuropil, fluorescence microscopy revealed immunostaining of excitatory synapses throughout the forebrain, and immunoreactive puncta within and directly outside the nucleus. Presynaptic staining was conspicuous in hippocampal mossy fibers. Electron microscopic analysis of material processed for postembedding immunogold revealed AIDA-1 label within postsynaptic densities in both hippocampus and cortex. Together with previous work, these data suggest that AIDA-1 serves as a direct signaling link between synapses and the nucleus in adult rat brain.
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Affiliation(s)
- Amanda L Jacob
- Curriculum in Neurobiology, University of North Carolina, Chapel Hill, North Carolina 27599, USA.
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11
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Doyle S, Pyndiah S, De Gois S, Erickson JD. Excitation-transcription coupling via calcium/calmodulin-dependent protein kinase/ERK1/2 signaling mediates the coordinate induction of VGLUT2 and Narp triggered by a prolonged increase in glutamatergic synaptic activity. J Biol Chem 2010; 285:14366-76. [PMID: 20212045 DOI: 10.1074/jbc.m109.080069] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Homeostatic scaling of glutamatergic and GABAergic transmission is triggered by prolonged alterations in synaptic neuronal activity. We have previously described a presynaptic mechanism for synaptic homeostasis and plasticity that involves scaling the level of vesicular glutamate (VGLUT1) and gamma-aminobutyric acid (GABA) (VGAT) transporter biosynthesis. These molecular determinants of vesicle filling and quantal size are regulated by neuronal activity in an opposite manner and bi-directionally. Here, we report that a striking induction of VGLUT2 mRNA and synaptic protein is triggered by a prolonged increase in glutamatergic synaptic activity in mature neocortical neuronal networks in vitro together with two determinants of inhibitory synaptic strength, the neuronal activity-regulated pentraxin (Narp), and glutamate decarboxylase (GAD65). Activity-dependent induction of VGLUT2 and Narp exhibits a similar intermediate-early gene response that is blocked by actinomycin D and tetrodotoxin, by inhibitors of ionotropic glutamate receptors and L-type voltage-gated calcium channels, and is dependent on downstream signaling via calmodulin, calcium/calmodulin-dependent protein kinase (CaMK) and extracellular signal-regulated kinase 1/2 (ERK1/2). The co-induction of VGLUT2 and Narp triggered by prolonged gamma-aminobutyric acid type A receptor blockade is independent of brain-derived nerve growth factor and TrkB receptor signaling. VGLUT2 protein induction occurs on a subset of cortically derived synaptic vesicles in excitatory synapses on somata and dendritic processes of multipolar GABAergic interneurons, recognized sites for the clustering of alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionate glutamate receptors by Narp. We propose that VGLUT2 and Narp induction by excitation-transcription coupling leads to increased glutamatergic transmission at synapses on GABAergic inhibitory feedback neurons as part of a coordinated program of Ca(2+)-signal transcription involved in mechanisms of homeostatic plasticity after prolonged hyperactivity.
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Affiliation(s)
- Sukhjeevan Doyle
- Neuroscience Center of Excellence, Louisiana State University Health Sciences Center, New Orleans, Louisiana 70112, USA
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12
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Kalashnikova E, Lorca RA, Kaur I, Barisone GA, Li B, Ishimaru T, Trimmer JS, Mohapatra DP, Díaz E. SynDIG1: an activity-regulated, AMPA- receptor-interacting transmembrane protein that regulates excitatory synapse development. Neuron 2010; 65:80-93. [PMID: 20152115 PMCID: PMC2822728 DOI: 10.1016/j.neuron.2009.12.021] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/10/2009] [Indexed: 12/21/2022]
Abstract
During development of the central nervous system, precise synaptic connections between presynaptic and postsynaptic neurons are formed. While significant progress has been made in our understanding of AMPA receptor trafficking during synaptic plasticity, less is known about the molecules that recruit AMPA receptors to nascent synapses during synaptogenesis. Here we identify a type II transmembrane protein (SynDIG1) that regulates AMPA receptor content at developing synapses in dissociated rat hippocampal neurons. SynDIG1 colocalizes with AMPA receptors at synapses and at extrasynaptic sites and associates with AMPA receptors in heterologous cells and brain. Altered levels of SynDIG1 in cultured neurons result in striking changes in excitatory synapse number and function. SynDIG1-mediated synapse development is dependent on association with AMPA receptors via its extracellular C terminus. Intriguingly, SynDIG1 content in dendritic spines is regulated by neuronal activity. Altogether, we define SynDIG1 as an activity-regulated transmembrane protein that regulates excitatory synapse development.
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Affiliation(s)
- Evgenia Kalashnikova
- Department of Pharmacology, School of Medicine, University of California, Davis, Davis, CA 95616, USA
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13
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Loebrich S, Nedivi E. The function of activity-regulated genes in the nervous system. Physiol Rev 2009; 89:1079-103. [PMID: 19789377 DOI: 10.1152/physrev.00013.2009] [Citation(s) in RCA: 175] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
The mammalian brain is plastic in the sense that it shows a remarkable capacity for change throughout life. The contribution of neuronal activity to brain plasticity was first recognized in relation to critical periods of development, when manipulating the sensory environment was found to profoundly affect neuronal morphology and receptive field properties. Since then, a growing body of evidence has established that brain plasticity extends beyond development and is an inherent feature of adult brain function, spanning multiple domains, from learning and memory to adaptability of primary sensory maps. Here we discuss evolution of the current view that plasticity of the adult brain derives from dynamic tuning of transcriptional control mechanisms at the neuronal level, in response to external and internal stimuli. We then review the identification of "plasticity genes" regulated by changes in the levels of electrical activity, and how elucidating their cellular functions has revealed the intimate role transcriptional regulation plays in fundamental aspects of synaptic transmission and circuit plasticity that occur in the brain on an every day basis.
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Affiliation(s)
- Sven Loebrich
- The Picower Institute for Learning and Memory, Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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14
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Newpher TM, Ehlers MD. Glutamate receptor dynamics in dendritic microdomains. Neuron 2008; 58:472-97. [PMID: 18498731 PMCID: PMC2572138 DOI: 10.1016/j.neuron.2008.04.030] [Citation(s) in RCA: 278] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2008] [Revised: 04/28/2008] [Accepted: 04/30/2008] [Indexed: 01/08/2023]
Abstract
Among diverse factors regulating excitatory synaptic transmission, the abundance of postsynaptic glutamate receptors figures prominently in molecular memory and learning-related synaptic plasticity. To allow for both long-term maintenance of synaptic transmission and acute changes in synaptic strength, the relative rates of glutamate receptor insertion and removal must be tightly regulated. Interactions with scaffolding proteins control the targeting and signaling properties of glutamate receptors within the postsynaptic membrane. In addition, extrasynaptic receptor populations control the equilibrium of receptor exchange at synapses and activate distinct signaling pathways involved in plasticity. Here, we review recent findings that have shaped our current understanding of receptor mobility between synaptic and extrasynaptic compartments at glutamatergic synapses, focusing on AMPA and NMDA receptors. We also examine the cooperative relationship between intracellular trafficking and surface diffusion of glutamate receptors that underlies the expression of learning-related synaptic plasticity.
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Affiliation(s)
- Thomas M. Newpher
- Department of Neurobiology, Duke University Medical Center, Durham, NC 27710, USA
| | - Michael D. Ehlers
- Department of Neurobiology, Duke University Medical Center, Durham, NC 27710, USA
- Howard Hughes Medical Institute, Duke University Medical Center, Durham, NC 27710, USA
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15
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Kobayashi MS, Asai S, Ishikawa K, Nishida Y, Nagata T, Takahashi Y. Global profiling of influence of intra-ischemic brain temperature on gene expression in rat brain. ACTA ACUST UNITED AC 2008; 58:171-91. [PMID: 18440647 DOI: 10.1016/j.brainresrev.2008.03.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2007] [Revised: 02/08/2008] [Accepted: 03/08/2008] [Indexed: 12/20/2022]
Abstract
Mild to moderate differences in brain temperature are known to greatly affect the outcome of cerebral ischemia. The impact of brain temperature on ischemic disorders has been mainly evaluated through pathological analysis. However, no comprehensive analyses have been conducted at the gene expression level. Using a high-density oligonucleotide microarray, we screened 24000 genes in the hippocampus under hypothermic (32 degrees C), normothermic (37 degrees C), and hyperthermic (39 degrees C) conditions in a rat ischemia-reperfusion model. When the ischemic group at each intra-ischemic brain temperature was compared to a sham-operated control group, genes whose expression levels changed more than three-fold with statistical significance could be detected. In our screening condition, thirty-three genes (some of them novel) were obtained after screening, and extensive functional surveys and literature reviews were subsequently performed. In the hypothermic condition, many neuroprotective factor genes were obtained, whereas cell death- and cell damage-associated genes were detected as the brain temperature increased. At all intra-ischemic brain temperatures, multiple molecular chaperone genes were obtained. The finding that intra-ischemic brain temperature affects the expression level of many genes related to neuroprotection or neurotoxicity coincides with the different pathological outcomes at different brain temperatures, demonstrating the utility of the genetic approach.
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Affiliation(s)
- Megumi Sugahara Kobayashi
- Division of Genomic Epidemiology and Clinical Trials, Advanced Medical Research Center, Nihon University School of Medicine, Oyaguchi-Kami Machi, Itabashi-ku, Tokyo 173-8610, Japan
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16
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Poirier G, Shires K, Sugden D, Amin E, Thomas K, Carter D, Aggleton J. Anterior thalamic lesions produce chronic and profuse transcriptional de-regulation in retrosplenial cortex: A model of retrosplenial hypoactivity and covert pathology. THALAMUS & RELATED SYSTEMS 2008; 4:59-77. [PMID: 21289865 PMCID: PMC3031093 DOI: 10.1017/s1472928808000368] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Anterior thalamic lesions are thought to produce 'covert pathology' in retrosplenial cortex, but the causes are unknown. Microarray analyses tested the hypothesis that thalamic damage causes a chronic, hypo-function of metabolic and plasticity-related pathways (Experiment 1). Rats with unilateral, anterior thalamic lesions were exposed to a novel environment for 20 minutes, and granular retrosplenial tissue sampled from both hemispheres 30 minutes, 2h, or 8h later. Complementary statistical approaches (analyses of variance, predictive patterning and gene set enrichment analysis) revealed pervasive gene expression differences between retrosplenial cortex ipsilateral to the thalamic lesion and contralateral to the lesion. Selected gene differences were validated by QPCR, immunohistochemistry (Experiment 1), and in situ hybridisation (Experiment 2). Following thalamic lesions, the retrosplenial cortex undergoes profuse cellular transcriptome changes including lower relative levels of specific mRNAs involved in energy metabolism and neuronal plasticity. These changes in functional gene expression may be largely driven by decreases in the expression of multiple transcription factors, including brd8, c-fos, fra-2, klf5, nfix, nr4a1, smad3, smarcc2, and zfp9, with a much smaller number (nfat5, neuroD1, RXRγ) showing increases. These findings have implications for conditions such as diencephalic amnesia and Alzheimer's disease, where both anterior thalamic pathology and retrosplenial cortex hypometabolism are prominent.
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Affiliation(s)
- G.L. Poirier
- School of Psychology, Cardiff University, Wales, UK
| | - K.L. Shires
- School of Psychology, Cardiff University, Wales, UK
- School of Biosciences, Cardiff University, Wales, UK
| | - D. Sugden
- Division of Reproduction and Endocrinology, School of Biomedical and Health Sciences, King’s College, London, UK
| | - E. Amin
- School of Psychology, Cardiff University, Wales, UK
| | - K.L. Thomas
- School of Biosciences, Cardiff University, Wales, UK
| | - D.A. Carter
- School of Biosciences, Cardiff University, Wales, UK
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17
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Rohrbough J, Rushton E, Woodruff E, Fergestad T, Vigneswaran K, Broadie K. Presynaptic establishment of the synaptic cleft extracellular matrix is required for post-synaptic differentiation. Genes Dev 2007; 21:2607-28. [PMID: 17901219 PMCID: PMC2000325 DOI: 10.1101/gad.1574107] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Formation and regulation of excitatory glutamatergic synapses is essential for shaping neural circuits throughout development. In a Drosophila genetic screen for synaptogenesis mutants, we identified mind the gap (mtg), which encodes a secreted, extracellular N-glycosaminoglycan-binding protein. MTG is expressed neuronally and detected in the synaptic cleft, and is required to form the specialized transsynaptic matrix that links the presynaptic active zone with the post-synaptic glutamate receptor (GluR) domain. Null mtg embryonic mutant synapses exhibit greatly reduced GluR function, and a corresponding loss of localized GluR domains. All known post-synaptic signaling/scaffold proteins functioning upstream of GluR localization are also grossly reduced or mislocalized in mtg mutants, including the dPix-dPak-Dock cascade and the Dlg/PSD-95 scaffold. Ubiquitous or neuronally targeted mtg RNA interference (RNAi) similarly reduce post-synaptic assembly, whereas post-synaptically targeted RNAi has no effect, indicating that presynaptic MTG induces and maintains the post-synaptic pathways driving GluR domain formation. These findings suggest that MTG is secreted from the presynaptic terminal to shape the extracellular synaptic cleft domain, and that the cleft domain functions to mediate transsynaptic signals required for post-synaptic development.
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Affiliation(s)
- Jeffrey Rohrbough
- Department of Biological Sciences, Kennedy Center for Research on Human Development, Vanderbilt University, Nashville, Tennessee 37235, USA
| | - Emma Rushton
- Department of Biological Sciences, Kennedy Center for Research on Human Development, Vanderbilt University, Nashville, Tennessee 37235, USA
| | - Elvin Woodruff
- Department of Biological Sciences, Kennedy Center for Research on Human Development, Vanderbilt University, Nashville, Tennessee 37235, USA
| | - Tim Fergestad
- Department of Biological Sciences, Kennedy Center for Research on Human Development, Vanderbilt University, Nashville, Tennessee 37235, USA
| | - Krishanthan Vigneswaran
- Department of Biological Sciences, Kennedy Center for Research on Human Development, Vanderbilt University, Nashville, Tennessee 37235, USA
| | - Kendal Broadie
- Department of Biological Sciences, Kennedy Center for Research on Human Development, Vanderbilt University, Nashville, Tennessee 37235, USA
- Corresponding author.E-MAIL ; FAX (615) 936-0129
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18
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Abstract
The mammalian central nervous system (CNS) requires the proper formation of exquisitely precise circuits to function correctly. These neuronal circuits are assembled during development by the formation of synaptic connections between thousands of differentiating neurons. Proper synapse formation during childhood provides the substrate for cognition, whereas improper formation or function of these synapses leads to neurodevelopmental disorders, including mental retardation and autism. Recent work has begun to identify some of the early cellular events in synapse formation as well as the molecular signals that initiate this process. However, despite the wealth of information published on this topic in the past few years, some of the most fundamental questions about how, whether, and where glutamatergic synapses form in the mammalian CNS remain unanswered. This review focuses on the dynamic aspects of the early cellular and molecular events in the initial assembly of glutamatergic synapses in the mammalian CNS.
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19
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Rosen KM, Moghekar A, O’Brien RJ. Activity dependent localization of synaptic NMDA receptors in spinal neurons. Mol Cell Neurosci 2006; 34:578-91. [PMID: 17306986 PMCID: PMC2735016 DOI: 10.1016/j.mcn.2006.12.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2006] [Revised: 11/25/2006] [Accepted: 12/21/2006] [Indexed: 11/24/2022] Open
Abstract
In cultured spinal neurons, NMDA receptors are absent from excitatory synapses under basal conditions, but can be made to appear at excitatory synapses following blockade of excitatory synaptic activity. The activity dependent synaptic localization of NMDA receptors is critically dependent on both the gradual, global accumulation of the NR2A and NR2B subunits and on a rapid, surface redistribution phase that is primed by the accumulation of NR2A and NR2B and inhibited by synaptic activity. Global changes in NR2A and NR2B accumulation and heterogeneous increases in synaptic NMDA receptor localization can also result from inhibitors of proteasomal processing, from manipulations of proteasomal subunit composition and from media conditioned by neurons undergoing synaptic scaling. While proteasomal processing is a mechanism shared with AMPA receptor scaling in cultured spinal neurons, diffusible factors, heterogeneity, and a rapid surface redistribution phase appear to be unique to activity dependent synaptic NMDA receptor localization.
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Affiliation(s)
- Kenneth M Rosen
- Department of Neurology, Caritas St. Elizabeth’s Medical Center, Tufts University School of Medicine, Boston, MA 02135
| | - Abhay Moghekar
- Department of Neurology, Johns Hopkins University, Baltimore, MD 21205
| | - Richard J O’Brien
- Department of Neurology, Johns Hopkins University, Baltimore, MD 21205
- Department of Neuroscience, Johns Hopkins University, Baltimore, MD 21205
- Address Correspondence to: Richard J O’Brien MD, Mason F Lord Center Tower Room 5100, Johns Hopkins Bayview Medical Center, 5200 Eastern Ave, Baltimore, MD 21224, Ph: 410 550 8703, Fax: 410 550 8715,
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20
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Swanwick CC, Murthy NR, Mtchedlishvili Z, Sieghart W, Kapur J. Development of gamma-aminobutyric acidergic synapses in cultured hippocampal neurons. J Comp Neurol 2006; 495:497-510. [PMID: 16498682 PMCID: PMC2742963 DOI: 10.1002/cne.20897] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The formation and maturation of gamma-aminobutyric acid (GABA)-ergic synapses was studied in cultured hippocampal pyramidal neurons by both performing immunocytochemistry for GABAergic markers and recording miniature inhibitory postsynaptic currents (mIPSCs). Nascent GABAergic synapses appeared between 3 and 8 days in vitro (DIV), with GABAA receptor subunit clusters appearing first, followed by GAD-65 puncta, then functional synapses. The number of GABAergic synapses increased from 7 to 14 DIV, with a corresponding increase in frequency of mIPSCs. Moreover, these new GABAergic synapses formed on neuronal processes farther from the soma, contributing to decreased mIPSC amplitude and slowed mIPSC 19-90% rise time. The mIPSC decay quickened from 7 to 14 DIV, with a parallel change in the distribution of the alpha5 subunit from diffuse expression at 7 DIV to clustered expression at 14 DIV. These alpha5 clusters were mostly extrasynaptic. The alpha1 subunit was expressed as clusters in none of the neurons at 7 DIV, in 20% at 14 DIV, and in 80% at 21 DIV. Most of these alpha1 clusters were expressed at GABAergic synapses. In addition, puncta of GABA transporter 1 (GAT-1) were localized to GABAergic synapses at 14 DIV but were not expressed at 7 DIV. These studies demonstrate that mIPSCs appear after pre- and postsynaptic elements are in place. Furthermore, the process of maturation of GABAergic synapses involves increased synapse formation at distal processes, expression of new GABAA receptor subunits, and GAT-1 expression at synapses; these changes are reflected in altered frequency, kinetics, and drug sensitivity of mIPSCs.
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Affiliation(s)
| | - Namita R. Murthy
- College of Arts and Sciences, University of Virginia, Charlottesville, VA 22908, USA
| | | | - Werner Sieghart
- Center for Brain Research, Medical University of Vienna, Vienna, Austria
| | - Jaideep Kapur
- Neuroscience Graduate Program, University of Virginia, Charlottesville, VA 22908, USA
- Dept. of Neurology, University of Virginia, Charlottesville, VA 22908, USA
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21
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Jeong GB, Werner M, Gazula VR, Itoh T, Roberts M, David S, Pfister B, Cohen A, Neve RL, Hollmann M, Kalb R. Bi-directional control of motor neuron dendrite remodeling by the calcium permeability of AMPA receptors. Mol Cell Neurosci 2006; 32:299-314. [PMID: 16790357 DOI: 10.1016/j.mcn.2006.04.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2006] [Revised: 03/20/2006] [Accepted: 04/14/2006] [Indexed: 11/30/2022] Open
Abstract
Motor neurons express particularly high levels of the AMPA receptor subunit GluR1(Q)flip (GluR1(Q)i) during the period in early postnatal life when their dendritic tree grows and becomes more branched. To investigate how GluR1-containing AMPA receptors contribute to dendrite morphogenesis, we characterized a mutant form of GluR1 (containing a histidine in the Q/R editing site) with unique electrophysiological properties. Most notably, AMPA receptors assembled from GluR1(H)i display less calcium permeability than AMPA receptors assembled from GluR1(Q)i. Expression of GluR1(Q)i in vivo or in vitro led to an increase in dendrite branching with no net change in the overall tree size while GluR1(H)i led to a loss of branches and a net reduction in overall tree size. GluR1(H)i-dependent dendrite atrophy is mediated by protein phosphatase 2B. The results suggest that the electrophysiological properties of cell surface AMPA receptors, specifically their permeability to calcium, can be a central determinant of whether the dendrites undergo activity-dependent branching or atrophy.
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Affiliation(s)
- Goo-Bo Jeong
- Department of Anatomy, College of Medicine, Chungbuk National University, Cheong-ju 361-763, Republic of Korea
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22
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Dityatev A, Frischknecht R, Seidenbecher CI. Extracellular matrix and synaptic functions. Results Probl Cell Differ 2006; 43:69-97. [PMID: 17068968 DOI: 10.1007/400_025] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Comprehensive analysis of neuromuscular junction formation and recent data on synaptogenesis and long-term potentiation in the central nervous system revealed a number of extracellular matrix (ECM) molecules regulating different aspects of synaptic differentiation and function. The emerging mechanisms comprise interactions of ECM components with their cell surface receptors coupled to tyrosine kinase activities (agrin, integrin ligands, and reelin) and interactions with ion channels and transmitter receptors (Narp, tenascin-R and tenascin-C). These interactions may shape synaptic transmission and plasticity of excitatory synapses either via regulation of Ca2+ entry and postsynaptic expression of transmitter receptors or via control of GABAergic inhibition. The ECM molecules, derived from both neurons and glial cells and secreted into the extracellular space in an activity-dependent manner, may also shape synaptic plasticity through setting diffusion constraints for neurotransmitters, trophic factors and ions.
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Affiliation(s)
- Alexander Dityatev
- Institut für Neurophysiologie und Pathophysiologie, Universitätsklinikum Hamburg-Eppendorf, Germany.
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23
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Dityatev A, Schachner M. The extracellular matrix and synapses. Cell Tissue Res 2006; 326:647-54. [PMID: 16767406 DOI: 10.1007/s00441-006-0217-1] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2006] [Accepted: 04/20/2006] [Indexed: 11/27/2022]
Abstract
Extracellular matrix (ECM) molecules, derived from both neurons and glial cells, are secreted and accumulate in the extracellular space to regulate various aspects of pre- and postsynaptic differentiation, the maturation of synapses, and their plasticity. The emerging mechanisms comprise interactions of agrin, integrin ligands, and reelin, with their cognate cell-surface receptors being coupled to tyrosine kinase activities. These may induce the clustering of postsynaptic receptors and changes in their composition and function. Furthermore, direct interactions of laminins, neuronal pentraxins, and tenascin-R with voltage-gated Ca(2+) channels, alpha-amino-3-hydroxy-5-methylisoxazole-4-proprionic acid (AMPA), and gamma-aminobutyric acid(B) (GABA(B)) receptors, respectively, shape the organization and function of different subsets of synapses. Some of these mechanisms significantly contribute to the induction of long-term potentiation in excitatory synapses, either by the regulation of Ca(2+) entry via N-methyl-D-aspartate receptors or L-type Ca(2+) channels, or by the control of GABAergic inhibition.
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Affiliation(s)
- Alexander Dityatev
- Institut für Neurophysiologie und Pathophysiologie, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany.
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24
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Fox MA, Umemori H. Seeking long-term relationship: axon and target communicate to organize synaptic differentiation. J Neurochem 2006; 97:1215-31. [PMID: 16638017 DOI: 10.1111/j.1471-4159.2006.03834.x] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Synapses form after growing axons recognize their appropriate targets. The subsequent assembly of aligned pre and postsynaptic specializations is critical for synaptic function. This highly precise apposition of presynaptic elements (i.e. active zones) to postsynaptic specializations (i.e. neurotransmitter receptor clusters) strongly suggests that communication between the axon and target is required for synaptic differentiation. What trans-synaptic factors drive such differentiation at vertebrate synapses? First insights into the answers to this question came from studies at the neuromuscular junction (NMJ), where axon-derived agrin and muscle-derived laminin beta2 induce post and presynaptic differentiation, respectively. Recent work has suggested that axon- and target-derived factors similarly drive synaptic differentiation at central synapses. Specifically, WNT-7a, neuroligin, synaptic cell adhesion molecule (SynCAM) and fibroblast growth factor-22 (FGF-22) have all been identified as target-derived presynaptic organizers, whereas axon-derived neuronal activity regulated pentraxin (Narp), ephrinB and neurexin reciprocally co-ordinate postsynaptic differentiation. In addition to these axon- and target-derived inducers of synaptic differentiation, factors released from glial cells have also been implicated in regulating synapse assembly. Together, these recent findings have profoundly advanced our understanding of how precise appositions are established during vertebrate nervous system development.
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Affiliation(s)
- Michael A Fox
- Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138, USA.
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25
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Balland B, Lachamp P, Strube C, Kessler JP, Tell F. Glutamatergic synapses in the rat nucleus tractus solitarii develop by direct insertion of calcium-impermeable AMPA receptors and without activation of NMDA receptors. J Physiol 2006; 574:245-61. [PMID: 16690712 PMCID: PMC1817785 DOI: 10.1113/jphysiol.2006.108738] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Calcium influxes through ionotropic glutamate receptors (AMPA and NMDA receptors, AMPARs and NMDARs) are considered to be critical for the shaping and refinement of neural circuits during synaptogenesis. Using a combined morphological and electrophysiological approach, we evaluated this hypothesis at the level of the nucleus tractus solitarii (NTS), a brainstem structure that is a gateway for many visceral sensory afferent fibres. We confirmed that in the NTS, the first excitatory synapses appeared at embryonic day 18. We next characterized the biophysical properties of NTS AMPARs. Throughout perinatal development, both evoked and miniature EPSCs recorded in the presence of an NMDAR blocker were insensitive to polyamines and had linear current-voltage relationships. This demonstrated that AMPARs at NTS excitatory synapses were calcium-impermeable receptors composed of a majority of GluR2 subunits. We then investigated the influence of calcium influxes through NMDARs on the development of NTS synaptic transmission. We found that NMDAR expression at synaptic sites did not precede AMPAR expression. Moreover, NMDAR blockade in utero did not prevent the development of AMPAR synaptic currents and the synaptic clustering of GluR2 subunits. Thus, our data support an alternative model of synaptogenesis that does not depend on calcium influxes through either AMPARs or NMDARs. This model may be particularly relevant to the formation of neural networks devoted to basic behaviours required at birth for survival.
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Affiliation(s)
- Bénédicte Balland
- Laboratoire de Neurophysiologie Cellulaire, CNRS UMR 6150, IFR Jean-Roche, Faculté de Médecine, Bd Pierre Dramard, 13916 Marseille cedex 20, France
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26
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Patton B, Burgess RW. Synaptogenesis. Dev Neurobiol 2006. [DOI: 10.1007/0-387-28117-7_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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27
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Craig AM, Graf ER, Linhoff MW. How to build a central synapse: clues from cell culture. Trends Neurosci 2005; 29:8-20. [PMID: 16337695 PMCID: PMC2820512 DOI: 10.1016/j.tins.2005.11.002] [Citation(s) in RCA: 144] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2005] [Revised: 08/31/2005] [Accepted: 11/10/2005] [Indexed: 01/10/2023]
Abstract
Central neurons develop and maintain molecularly distinct synaptic specializations for excitatory and inhibitory transmitters, often only microns apart on their dendritic arbor. Progress towards understanding the molecular basis of synaptogenesis has come from several recent studies using a coculture system of non-neuronal cells expressing molecules that generate presynaptic or postsynaptic "hemi-synapses" on contacting neurons. Together with molecular properties of these protein families, such studies have yielded interesting clues to how glutamatergic and GABAergic synapses are assembled. Other clues come from heterochronic cultures, manipulations of activity in subsets of neurons in a network, and of course many in vivo studies. Taking into account these data, we consider here how basic parameters of synapses--competence, placement, composition, size and longevity--might be determined.
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Affiliation(s)
- Ann Marie Craig
- Brain Research Centre and Department of Psychiatry, University of British Columbia, Vancouver, Canada V6T 2B5.
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28
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Abstract
The formation of synapses is critical for functional neuronal connectivity. The coordinated assembly at both sides of the synapse is fundamental for the proper apposition of the neurotransmitter release machinery on the presynaptic neuron and the clustering of neurotransmitter receptors and ion channels on the receptive postsynaptic cell. This process requires bidirectional communication between the presynaptic neuron and its postsynaptic target, another neuron, or muscle fiber. Extracellular signals such as WNT, TGF-beta, and FGF factors are emerging as key target-derived signals required for the initial stages of synaptic assembly. Studies in invertebrates are also providing new insights into the function of these signals in synaptic growth and homeostasis. During early embryonic patterning, WNT, TGF-beta, and FGF factors function as typical morphogens in a concentration-dependent manner to regulate cell fate decisions. This mode of action raises the provocative idea that these same morphogens might also provide a coordinate system for axons to establish the distance to their targets during axon guidance and synapse formation.
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Affiliation(s)
- Patricia C Salinas
- Department of Anatomy and Developmental Biology, University College London, University Street, London WC1E 6BT, United Kingdom.
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29
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Abstract
The formation of synapses in the vertebrate central nervous system is a complex process that occurs over a protracted period of development. Recent work has begun to unravel the mysteries of synaptogenesis, demonstrating the existence of multiple molecules that influence not only when and where synapses form but also synaptic specificity and stability. Some of these molecules act at a distance, steering axons to their correct receptive fields and promoting neuronal differentiation and maturation, whereas others act at the time of contact, providing positional information about the appropriateness of targets and/or inductive signals that trigger the cascade of events leading to synapse formation. In addition, correlated synaptic activity provides critical information about the appropriateness of synaptic connections, thereby influencing synapse stability and elimination. Although synapse formation and elimination are hallmarks of early development, these processes are also fundamental to learning, memory, and cognition in the mature brain.
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Affiliation(s)
- Clarissa L Waites
- Department of Psychiatry and Behavioral Science, Nancy Pritzker Laboratory, Stanford University, Palo Alto, CA 94304-5485, USA.
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30
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Palmer CL, Cotton L, Henley JM. The molecular pharmacology and cell biology of alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors. Pharmacol Rev 2005; 57:253-77. [PMID: 15914469 PMCID: PMC3314513 DOI: 10.1124/pr.57.2.7] [Citation(s) in RCA: 160] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionate receptors (AMPARs) are of fundamental importance in the brain. They are responsible for the majority of fast excitatory synaptic transmission, and their overactivation is potently excitotoxic. Recent findings have implicated AMPARs in synapse formation and stabilization, and regulation of functional AMPARs is the principal mechanism underlying synaptic plasticity. Changes in AMPAR activity have been described in the pathology of numerous diseases, such as Alzheimer's disease, stroke, and epilepsy. Unsurprisingly, the developmental and activity-dependent changes in the functional synaptic expression of these receptors are under tight cellular regulation. The molecular and cellular mechanisms that control the postsynaptic insertion, arrangement, and lifetime of surface-expressed AMPARs are the subject of intense and widespread investigation. For example, there has been an explosion of information about proteins that interact with AMPAR subunits, and these interactors are beginning to provide real insight into the molecular and cellular mechanisms underlying the cell biology of AMPARs. As a result, there has been considerable progress in this field, and the aim of this review is to provide an account of the current state of knowledge.
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Affiliation(s)
- Claire L Palmer
- Medical Research Council Centre for Synaptic Plasticity, Department of Anatomy, School of Medical Sciences, Bristol University, Bristol, UK
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Pauly T, Schlicksupp A, Neugebauer R, Kuhse J. Synaptic targeting of N-methyl-D-aspartate receptor splice variants is regulated differentially by receptor activity. Neuroscience 2005; 131:99-111. [PMID: 15680695 DOI: 10.1016/j.neuroscience.2004.10.039] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/15/2004] [Indexed: 11/19/2022]
Abstract
The formation of postsynaptic clusters of various ligand-gated ion channels is regulated by receptor activity. Here we describe the developmental- and activity-dependent modification of N-methyl-D-aspartate (NMDA) receptor clustering in spinal cord neurons in vitro detected by immunofluorescence analysis using subunit and splice variant specific antibodies. NMDA receptors form synaptic and extrasynaptic clusters with sequential changes in subunit composition during in vitro development. During the first week of in vitro culture, a NR1 splice variant containing the C2-carboxy terminus and lacking the N1-cassette and the NR2B subunit are the prevailing components of receptor clusters at synaptic and extrasynaptic sites. After 3 weeks in culture (days in vitro [DIV] 22), the numbers of postsynaptic receptor clusters with N1-containing NR1 splice variants and NR2A subunits are upregulated. At DIV22, C2-specific clusters are abundant and are predominantly localized at postsynaptic sites, whereas the total number of C2'-clusters in dendrites is much lower and these clusters are localized mostly extrasynaptically. However, upon chronic inhibition of NMDA receptor activity in DIV8 and DIV22 cultures with MK801, the number of postsynaptic NR1-C2' subunit clusters is strongly upregulated. In contrast, numbers of NR1-C2 clusters are only modestly increased in DIV8 and not changed in DIV22 cultures upon MK801 treatment, suggesting a specific role of NR1 carboxy-terminal sequences in the activity-dependent synaptic targeting of NMDA receptor clusters of spinal cord neurons.
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Affiliation(s)
- T Pauly
- Department of Anatomy and Cellular Neurobiology, University of Ulm, Albert-Einstein-Allee 11, 89081 Ulm, Germany
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Jelitai M, Madarasz E. The role of GABA in the early neuronal development. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2005; 71:27-62. [PMID: 16512345 DOI: 10.1016/s0074-7742(05)71002-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Marta Jelitai
- Laboratory of Neural Cell and Developmental Biology, Institute of Experimental Medicine, Hungarian Academy of Sciences, Budapest
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Mi R, Sia GM, Rosen K, Tang X, Moghekar A, Black JL, McEnery M, Huganir RL, O'Brien RJ. AMPA receptor-dependent clustering of synaptic NMDA receptors is mediated by Stargazin and NR2A/B in spinal neurons and hippocampal interneurons. Neuron 2004; 44:335-49. [PMID: 15473971 DOI: 10.1016/j.neuron.2004.09.029] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2004] [Revised: 07/13/2004] [Accepted: 09/27/2004] [Indexed: 10/26/2022]
Abstract
Under standard conditions, cultured ventral spinal neurons cluster AMPA- but not NMDA-type glutamate receptors at excitatory synapses on their dendritic shafts in spite of abundant expression of the ubiquitous NMDA receptor subunit NR1. We demonstrate here that the NMDA receptor subunits NR2A and NR2B are not routinely expressed in cultured spinal neurons and that transfection with NR2A or NR2B reconstitutes the synaptic targeting of NMDA receptors and confers on exogenous application of the immediate early gene product Narp the ability to cluster both AMPA and NMDA receptors. The use of dominant-negative mutants of GluR2 further showed that the synaptic targeting of NMDA receptors is dependent on the presence of synaptic AMPA receptors and that synaptic AMPA and NMDA receptors are linked by Stargazin and a MAGUK protein. This system of AMPA receptor-dependent synaptic NMDA receptor localization was preserved in hippocampal interneurons but reversed in hippocampal pyramidal neurons.
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Affiliation(s)
- Ruifa Mi
- Department of Neurology, Johns Hopkins University, Baltimore, MD 21205, USA
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Abstract
Excitatory synapses in the CNS release glutamate, which acts primarily on two sides of ionotropic receptors: AMPA receptors and NMDA receptors. AMPA receptors mediate the postsynaptic depolarization that initiates neuronal firing, whereas NMDA receptors initiate synaptic plasticity. Recent studies have emphasized that distinct mechanisms control synaptic expression of these two receptor classes. Whereas NMDA receptor proteins are relatively fixed, AMPA receptors cycle synaptic membranes on and off. A large family of interacting proteins regulates AMPA receptor turnover at synapses and thereby influences synaptic strength. Furthermore, neuronal activity controls synaptic AMPA receptor trafficking, and this dynamic process plays a key role in the synaptic plasticity that is thought to underlie aspects of learning and memory.
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Affiliation(s)
- David S Bredt
- Department of Physiology, University of California, San Francisco, San Francisco, CA 94143, USA.
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Abstract
Ionotropic glutamate receptors excite nerve cells by forming cation-selective pores in the membrane. Recent work, however, provides evidence that atypical signaling by glutamate receptors regulates the production and maintenance of dendritic spines, the short outgrowths that receive most central excitatory synapses. The control of spine formation involves the amino-terminal extracellular domain of the GluR2 subunit of AMPA (alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid) receptors. How interactions with this domain elicit signals to downstream effectors remains to be elucidated, but ion flux through the channel may not be required. This Perspective discusses the possibility that regulation of spines by GluR2 may be one of a growing collection of cases in which ionotropic glutamate receptors can elicit biochemical changes that are conventionally attributed to metabotropic receptors. It is suggested that proteins in contact with specific glutamate receptor subunits may directly sense the conformational changes produced by agonist binding.
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Affiliation(s)
- James E Huettner
- Department of Cell Biology and Physiology, Washington University Medical School, 660 South Euclid Avenue, St. Louis, MO 63110, USA.
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Benninger F, Beck H, Wernig M, Tucker KL, Brüstle O, Scheffler B. Functional integration of embryonic stem cell-derived neurons in hippocampal slice cultures. J Neurosci 2003; 23:7075-83. [PMID: 12904468 PMCID: PMC6740655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023] Open
Abstract
The generation of neurons and glia from pluripotent embryonic stem (ES) cells represents a promising strategy for the study of CNS development and repair. ES cell-derived neural precursors have been shown to develop into morphologically mature neurons and glia when grafted into brain and spinal cord. However, there is a surprising shortage of data concerning the functional integration of ES cell-derived neurons (ESNs) into the host CNS tissue. Here, we use ES cells engineered to express enhanced green fluorescent protein (EGFP) only in neuronal progeny to study the functional properties of ESNs during integration into long-term hippocampal slice cultures. After incorporation into the dentate gyrus, EGFP+ donor neurons display a gradual maturation of their intrinsic discharge behavior and a concomitant increase in the density of voltage-gated Na+ and K+ channels. Integrated ESNs express AMPA and GABA(A) receptor subunits. Most importantly, neurons derived from ES cells receive functional glutamatergic and GABAergic synapses from host neurons. Specifically, we demonstrate that host perforant path axons form synapses onto integrated ESNs. These synapses between host and ES cell-derived neurons display pronounced paired-pulse facilitation indicative of intact presynaptic short-term plasticity. Thus, ES cell-derived neural precursors generate functionally active neurons capable of integrating into the brain circuitry.
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Affiliation(s)
- Felix Benninger
- Institute of Reconstructive Neurobiology, University of Bonn Medical Center, D-53105 Bonn, Germany
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Affiliation(s)
- Alexander Dityatev
- Zentrum für Molekulare Neurobiologie, University of Hamburg, Martinistr. 52, 20246 Hamburg, Germany.
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