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ElGrawani W, Sun G, Kliem FP, Sennhauser S, Pierre-Ferrer S, Rosi-Andersen A, Boccalaro I, Bethge P, Heo WD, Helmchen F, Adamantidis AR, Forger DB, Robles MS, Brown SA. BDNF-TrkB signaling orchestrates the buildup process of local sleep. Cell Rep 2024; 43:114500. [PMID: 39046880 DOI: 10.1016/j.celrep.2024.114500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 05/15/2024] [Accepted: 06/27/2024] [Indexed: 07/27/2024] Open
Abstract
Sleep debt accumulates during wakefulness, leading to increased slow wave activity (SWA) during sleep, an encephalographic marker for sleep need. The use-dependent demands of prior wakefulness increase sleep SWA locally. However, the circuitry and molecular identity of this "local sleep" remain unclear. Using pharmacology and optogenetic perturbations together with transcriptomics, we find that cortical brain-derived neurotrophic factor (BDNF) regulates SWA via the activation of tyrosine kinase B (TrkB) receptor and cAMP-response element-binding protein (CREB). We map BDNF/TrkB-induced sleep SWA to layer 5 (L5) pyramidal neurons of the cortex, independent of neuronal firing per se. Using mathematical modeling, we here propose a model of how BDNF's effects on synaptic strength can increase SWA in ways not achieved through increased firing alone. Proteomic analysis further reveals that TrkB activation enriches ubiquitin and proteasome subunits. Together, our study reveals that local SWA control is mediated by BDNF-TrkB-CREB signaling in L5 excitatory cortical neurons.
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Affiliation(s)
- Waleed ElGrawani
- Institute of Pharmacology and Toxicology, University of Zurich, Zurich, Switzerland; Neuroscience Center Zurich (ZNZ), University of Zurich, Zurich, Switzerland.
| | - Guanhua Sun
- Department of Mathematics, University of Michigan, Ann Arbor, MI, USA
| | - Fabian P Kliem
- Institute of Medical Psychology and Biomedical Center (BMC), Faculty of Medicine, LMU Munich, Germany
| | - Simon Sennhauser
- Institute of Pharmacology and Toxicology, University of Zurich, Zurich, Switzerland
| | - Sara Pierre-Ferrer
- Institute of Pharmacology and Toxicology, University of Zurich, Zurich, Switzerland; Neuroscience Center Zurich (ZNZ), University of Zurich, Zurich, Switzerland
| | - Alex Rosi-Andersen
- Institute of Pharmacology and Toxicology, University of Zurich, Zurich, Switzerland; Neuroscience Center Zurich (ZNZ), University of Zurich, Zurich, Switzerland
| | - Ida Boccalaro
- Zentrum für Experimentelle Neurologie, Department of Neurology, Inselspital University Hospital Bern, Bern, Switzerland
| | - Philipp Bethge
- Neuroscience Center Zurich (ZNZ), University of Zurich, Zurich, Switzerland; Brain Research Institute, University of Zurich, Zurich, Switzerland
| | - Won Do Heo
- Department of Biological Science, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Republic of Korea
| | - Fritjof Helmchen
- Neuroscience Center Zurich (ZNZ), University of Zurich, Zurich, Switzerland; Brain Research Institute, University of Zurich, Zurich, Switzerland; University Research Priority Program (URPP), Adaptive Brain Circuits in Development and Learning, University of Zurich, Zurich, Switzerland
| | - Antoine R Adamantidis
- Zentrum für Experimentelle Neurologie, Department of Neurology, Inselspital University Hospital Bern, Bern, Switzerland.
| | - Daniel B Forger
- Department of Mathematics, University of Michigan, Ann Arbor, MI, USA; Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI, USA.
| | - Maria S Robles
- Institute of Medical Psychology and Biomedical Center (BMC), Faculty of Medicine, LMU Munich, Germany.
| | - Steven A Brown
- Institute of Pharmacology and Toxicology, University of Zurich, Zurich, Switzerland
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2
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Brandão-Teles C, Antunes ASLM, de Moraes Vrechi TA, Martins-de-Souza D. The Roles of hnRNP Family in the Brain and Brain-Related Disorders. Mol Neurobiol 2024; 61:3578-3595. [PMID: 37999871 DOI: 10.1007/s12035-023-03747-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Accepted: 10/25/2023] [Indexed: 11/25/2023]
Abstract
Heterogeneous nuclear ribonucleoproteins (hnRNPs) belong to a complex family of RNA-binding proteins that are essential to control alternative splicing, mRNA trafficking, synaptic plasticity, stress granule formation, cell cycle regulation, and axonal transport. Over the past decade, hnRNPs have been associated with different brain disorders such as Alzheimer's disease, multiple sclerosis, and schizophrenia. Given their essential role in maintaining cell function and integrity, it is not surprising that dysregulated hnRNP levels lead to neurological implications. This review aims to explore the primary functions of hnRNPs in neurons, oligodendrocytes, microglia, and astrocytes, and their roles in brain disorders. We also discuss proteomics and other technologies and their potential for studying and evaluating hnRNPs in brain disorders, including the discovery of new therapeutic targets and possible pharmacological interventions.
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Affiliation(s)
- Caroline Brandão-Teles
- Laboratory of Neuroproteomics, Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas, Campinas, Brazil.
| | - André S L M Antunes
- Brazilian Biosciences National Laboratory (LNBio), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, Brazil
| | - Talita Aparecida de Moraes Vrechi
- Laboratory of Neuroproteomics, Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas, Campinas, Brazil
| | - Daniel Martins-de-Souza
- Laboratory of Neuroproteomics, Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas, Campinas, Brazil.
- D'Or Institute for Research and Education (IDOR), São Paulo, Brazil.
- Experimental Medicine Research Cluster (EMRC), University of Campinas, Campinas, SP, 13083-862, Brazil.
- INCT in Modelling Human Complex Diseases with 3D Platforms (Model3D), São Paulo, Brazil.
- Conselho Nacional de Desenvolvimento Científico e Tecnológico, Instituto Nacional de Biomarcadores em Neuropsiquiatria, São Paulo, Brazil.
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3
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Harvey T, Rios M. The Role of BDNF and TrkB in the Central Control of Energy and Glucose Balance: An Update. Biomolecules 2024; 14:424. [PMID: 38672441 PMCID: PMC11048226 DOI: 10.3390/biom14040424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Revised: 03/27/2024] [Accepted: 03/29/2024] [Indexed: 04/28/2024] Open
Abstract
The global rise in obesity and related health issues, such as type 2 diabetes and cardiovascular disease, is alarming. Gaining a deeper insight into the central neural pathways and mechanisms that regulate energy and glucose homeostasis is crucial for developing effective interventions to combat this debilitating condition. A significant body of evidence from studies in humans and rodents indicates that brain-derived neurotrophic factor (BDNF) signaling plays a key role in regulating feeding, energy expenditure, and glycemic control. BDNF is a highly conserved neurotrophin that signals via the tropomyosin-related kinase B (TrkB) receptor to facilitate neuronal survival, differentiation, and synaptic plasticity and function. Recent studies have shed light on the mechanisms through which BDNF influences energy and glucose balance. This review will cover our current understanding of the brain regions, neural circuits, and cellular and molecular mechanisms underlying the metabolic actions of BDNF and TrkB.
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Affiliation(s)
- Theresa Harvey
- Graduate Program in Neuroscience, Graduate School of Biomedical Sciences, Tufts University School of Medicine, Boston, MA 02111, USA;
| | - Maribel Rios
- Graduate Program in Neuroscience, Graduate School of Biomedical Sciences, Tufts University School of Medicine, Boston, MA 02111, USA;
- Department of Neuroscience, Tufts University School of Medicine, 136 Harrison Avenue, Boston, MA 02111, USA
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4
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Costa RO, Martins LF, Tahiri E, Duarte CB. Brain-derived neurotrophic factor-induced regulation of RNA metabolism in neuronal development and synaptic plasticity. WILEY INTERDISCIPLINARY REVIEWS. RNA 2022; 13:e1713. [PMID: 35075821 DOI: 10.1002/wrna.1713] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 12/17/2021] [Accepted: 12/22/2021] [Indexed: 06/14/2023]
Abstract
The neurotrophin brain-derived neurotrophic factor (BDNF) plays multiple roles in the nervous system, including in neuronal development, in long-term synaptic potentiation in different brain regions, and in neuronal survival. Alterations in these regulatory mechanisms account for several diseases of the nervous system. The synaptic effects of BDNF mediated by activation of tropomyosin receptor kinase B (TrkB) receptors are partly mediated by stimulation of local protein synthesis which is now considered a ubiquitous feature in both presynaptic and postsynaptic compartments of the neuron. The capacity to locally synthesize proteins is of great relevance at several neuronal developmental stages, including during neurite development, synapse formation, and stabilization. The available evidence shows that the effects of BDNF-TrkB signaling on local protein synthesis regulate the structure and function of the developing and mature synapses. While a large number of studies have illustrated a wide range of effects of BDNF on the postsynaptic proteome, a growing number of studies also point to presynaptic effects of the neurotrophin in the local regulation of the protein composition at the presynaptic level. Here, we will review the latest evidence on the role of BDNF in local protein synthesis, comparing the effects on the presynaptic and postsynaptic compartments. Additionally, we overview the relevance of BDNF-associated local protein synthesis in neuronal development and synaptic plasticity, at the presynaptic and postsynaptic compartments, and their relevance in terms of disease. This article is categorized under: RNA Interactions with Proteins and Other Molecules > Protein-RNA Interactions: Functional Implications RNA Export and Localization > RNA Localization.
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Affiliation(s)
- Rui O Costa
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
- Institute for Interdisciplinary Research, University of Coimbra, Coimbra, Portugal
| | - Luís F Martins
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
- Institute for Interdisciplinary Research, University of Coimbra, Coimbra, Portugal
- Molecular Neurobiology Laboratory, Division of Neuroscience, San Raffaele Scientific Institute, Milan, Italy
| | - Emanuel Tahiri
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
| | - Carlos B Duarte
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
- Department of Life Sciences, University of Coimbra, Coimbra, Portugal
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Cis- and trans-resveratrol have opposite effects on histone serine-ADP-ribosylation and tyrosine induced neurodegeneration. Nat Commun 2022; 13:3244. [PMID: 35688816 PMCID: PMC9187644 DOI: 10.1038/s41467-022-30785-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Accepted: 05/19/2022] [Indexed: 11/08/2022] Open
Abstract
Serum tyrosine levels increase during aging, neurocognitive, metabolic, and cardiovascular disorders. However, calorie restriction (CR) and sleep lower serum tyrosine levels. We previously showed that tyrosine inhibits tyrosyl-tRNA synthetase (TyrRS)-mediated activation of poly-ADP-ribose polymerase 1 (PARP1). Here, we show that histone serine-ADP-ribosylation is decreased in Alzheimer's Disease (AD) brains, and increased tyrosine levels deplete TyrRS and cause neuronal DNA damage. However, dopamine and brain-derived neurotrophic factor (BDNF) increase TyrRS and histone serine-ADP-ribosylation. Furthermore, cis-resveratrol (cis-RSV) that binds to TyrRS mimicking a 'tyrosine-free' conformation increases TyrRS, facilitates histone serine-ADP-ribosylation-dependent DNA repair, and provides neuroprotection in a TyrRS-dependent manner. Conversely, trans-RSV that binds to TyrRS mimicking a 'tyrosine-like' conformation decreases TyrRS, inhibits serine-ADP-ribosylation-dependent DNA repair, and induces neurodegeneration in rat cortical neurons. Our findings suggest that age-associated increase in serum tyrosine levels may effect neurocognitive and metabolic disorders and offer a plausible explanation for divergent results obtained in clinical trials using resveratrol.
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Saenno R, Dornlakorn O, Anosri T, Kaewngam S, Sirichoat A, Aranarochana A, Pannangrong W, Wigmore P, Welbat JU. Caffeic Acid Alleviates Memory and Hippocampal Neurogenesis Deficits in Aging Rats Induced by D-Galactose. Nutrients 2022; 14:nu14102169. [PMID: 35631310 PMCID: PMC9145046 DOI: 10.3390/nu14102169] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 05/21/2022] [Accepted: 05/22/2022] [Indexed: 02/04/2023] Open
Abstract
Hippocampal neurogenesis occurs throughout life, but it declines with age. D-galactose (D-gal) enhances cellular senescence through oxidative stress leading to neurodegeneration and memory impairment. Caffeic acid (CA) acts as an antioxidant via decreasing brain oxidative stress. This study aims to investigate the advantages of CA in alleviating the loss of memory and neurogenesis production in the hippocampus in aged rats activated by D-gal. Fifty-four male Sprague-Dawley rats were unpredictably arranged into six groups. In the D-gal group, rats were administered D-gal (50 mg/kg) by intraperitoneal (i.p.) injection. For the CA groups, rats received 20 or 40 mg/kg CA by oral gavage. In the co-treated groups, rats received D-gal (50 mg/kg) and CA (20 or 40 mg/kg) for eight weeks. The results of novel object location (NOL) and novel object recognition (NOR) tests showed memory deficits. Moreover, a decline of neurogenesis in the hippocampus was detected in rats that received D-gal by detecting rat endothelial cell antigen-1 (RECA-1)/Ki-67, 5-bromo-2′-deoxyuridine (BrdU)/neuronal nuclear protein (NeuN), doublecortin (DCX) by means of staining to evaluate blood vessel associated proliferating cells, neuronal cell survival and premature neurons, respectively. By contrast, CA attenuated these effects. Our results postulate that CA attenuated the impairment of memory in D-gal-stimulated aging by up-regulating levels of hippocampal neurogenesis.
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Affiliation(s)
- Rasa Saenno
- Neurogenesis Research Group, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; (R.S.); (O.D.); (T.A.); (S.K.); (A.S.); (A.A.); (W.P.)
| | - Oabnithi Dornlakorn
- Neurogenesis Research Group, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; (R.S.); (O.D.); (T.A.); (S.K.); (A.S.); (A.A.); (W.P.)
| | - Tanaporn Anosri
- Neurogenesis Research Group, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; (R.S.); (O.D.); (T.A.); (S.K.); (A.S.); (A.A.); (W.P.)
| | - Soraya Kaewngam
- Neurogenesis Research Group, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; (R.S.); (O.D.); (T.A.); (S.K.); (A.S.); (A.A.); (W.P.)
| | - Apiwat Sirichoat
- Neurogenesis Research Group, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; (R.S.); (O.D.); (T.A.); (S.K.); (A.S.); (A.A.); (W.P.)
| | - Anusara Aranarochana
- Neurogenesis Research Group, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; (R.S.); (O.D.); (T.A.); (S.K.); (A.S.); (A.A.); (W.P.)
| | - Wanassanun Pannangrong
- Neurogenesis Research Group, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; (R.S.); (O.D.); (T.A.); (S.K.); (A.S.); (A.A.); (W.P.)
| | - Peter Wigmore
- School of Life Sciences, Medical School, Queen’s Medical Centre, The University of Nottingham, Nottingham NG7 2RD, UK;
| | - Jariya Umka Welbat
- Neurogenesis Research Group, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen 40002, Thailand; (R.S.); (O.D.); (T.A.); (S.K.); (A.S.); (A.A.); (W.P.)
- Correspondence: ; Tel.: +66-84-667-6105
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Maffioli E, Angiulli E, Nonnis S, Grassi Scalvini F, Negri A, Tedeschi G, Arisi I, Frabetti F, D’Aniello S, Alleva E, Cioni C, Toni M. Brain Proteome and Behavioural Analysis in Wild Type, BDNF +/- and BDNF -/- Adult Zebrafish ( Danio rerio) Exposed to Two Different Temperatures. Int J Mol Sci 2022; 23:ijms23105606. [PMID: 35628418 PMCID: PMC9146406 DOI: 10.3390/ijms23105606] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 05/07/2022] [Accepted: 05/11/2022] [Indexed: 11/16/2022] Open
Abstract
Experimental evidence suggests that environmental stress conditions can alter the expression of BDNF and that the expression of this neurotrophin influences behavioural responses in mammalian models. It has been recently demonstrated that exposure to 34 °C for 21 days alters the brain proteome and behaviour in zebrafish. The aim of this work was to investigate the role of BDNF in the nervous system of adult zebrafish under control and heat treatment conditions. For this purpose, zebrafish from three different genotypes (wild type, heterozygous BDNF+/- and knock out BDNF-/-) were kept for 21 days at 26 °C or 34 °C and then euthanized for brain molecular analyses or subjected to behavioural tests (Y-maze test, novel tank test, light and dark test, social preference test, mirror biting test) for assessing behavioural aspects such as boldness, anxiety, social preference, aggressive behaviour, interest for the novel environment and exploration. qRT-PCR analysis showed the reduction of gene expression of BDNF and its receptors after heat treatment in wild type zebrafish. Moreover, proteomic analysis and behavioural tests showed genotype- and temperature-dependent effects on brain proteome and behavioural responding. Overall, the absent expression of BDNF in KO alters (1) the brain proteome by reducing the expression of proteins involved in synapse functioning and neurotransmitter-mediated transduction; (2) the behaviour, which can be interpreted as bolder and less anxious and (3) the cellular and behavioural response to thermal treatment.
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Affiliation(s)
- Elisa Maffioli
- Department of Veterinary Medicine and Animal Science, Università degli Studi di Milano, Via dell’Università 6, 26900 Lodi, Italy; (E.M.); (S.N.); (F.G.S.); (A.N.); (G.T.)
| | - Elisa Angiulli
- Department of Biology and Biotechnology “Charles Darwin”, Sapienza University, Via Alfonso Borelli 50, 00161 Rome, Italy; (E.A.); (C.C.)
| | - Simona Nonnis
- Department of Veterinary Medicine and Animal Science, Università degli Studi di Milano, Via dell’Università 6, 26900 Lodi, Italy; (E.M.); (S.N.); (F.G.S.); (A.N.); (G.T.)
- CRC I-WE (Coordinating Research Centre: Innovation for Well-Being and Environment), University of Milan, 20134 Milan, Italy
| | - Francesca Grassi Scalvini
- Department of Veterinary Medicine and Animal Science, Università degli Studi di Milano, Via dell’Università 6, 26900 Lodi, Italy; (E.M.); (S.N.); (F.G.S.); (A.N.); (G.T.)
| | - Armando Negri
- Department of Veterinary Medicine and Animal Science, Università degli Studi di Milano, Via dell’Università 6, 26900 Lodi, Italy; (E.M.); (S.N.); (F.G.S.); (A.N.); (G.T.)
| | - Gabriella Tedeschi
- Department of Veterinary Medicine and Animal Science, Università degli Studi di Milano, Via dell’Università 6, 26900 Lodi, Italy; (E.M.); (S.N.); (F.G.S.); (A.N.); (G.T.)
- CRC I-WE (Coordinating Research Centre: Innovation for Well-Being and Environment), University of Milan, 20134 Milan, Italy
| | - Ivan Arisi
- Bioinformatics Facility, European Brain Research Institute (EBRI) “Rita Levi-Montalcini”, 00161 Rome, Italy;
- Institute of Translational Pharmacology (IFT), National Research Council (CNR), 00131 Rome, Italy
| | - Flavia Frabetti
- Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, 40136 Bologna, Italy;
| | - Salvatore D’Aniello
- Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn Napoli, Villa Comunale, 80121 Napoli, Italy;
| | - Enrico Alleva
- Center for Behavioural Sciences and Mental Health, Istituto Superiore di Sanità, 00161 Rome, Italy;
| | - Carla Cioni
- Department of Biology and Biotechnology “Charles Darwin”, Sapienza University, Via Alfonso Borelli 50, 00161 Rome, Italy; (E.A.); (C.C.)
| | - Mattia Toni
- Department of Biology and Biotechnology “Charles Darwin”, Sapienza University, Via Alfonso Borelli 50, 00161 Rome, Italy; (E.A.); (C.C.)
- Correspondence:
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8
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Bin Ibrahim MZ, Benoy A, Sajikumar S. Long-term plasticity in the hippocampus: maintaining within and 'tagging' between synapses. FEBS J 2021; 289:2176-2201. [PMID: 34109726 DOI: 10.1111/febs.16065] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 05/15/2021] [Accepted: 06/01/2021] [Indexed: 12/11/2022]
Abstract
Synapses between neurons are malleable biochemical structures, strengthening and diminishing over time dependent on the type of information they receive. This phenomenon known as synaptic plasticity underlies learning and memory, and its different forms, long-term potentiation (LTP) and long-term depression (LTD), perform varied cognitive roles in reinforcement, relearning and associating memories. Moreover, both LTP and LTD can exist in an early transient form (early-LTP/LTD) or a late persistent form (late-LTP/LTD), which are triggered by different induction protocols, and also differ in their dependence on protein synthesis and the involvement of key molecular players. Beyond homosynaptic modifications, synapses can also interact with one another. This is encapsulated in the synaptic tagging and capture hypothesis (STC), where synapses expressing early-LTP/LTD present a 'tag' that can capture the protein synthesis products generated during a temporally proximal late-LTP/LTD induction. This 'tagging' phenomenon forms the framework of synaptic interactions in various conditions and accounts for the cellular basis of the time-dependent associativity of short-lasting and long-lasting memories. All these synaptic modifications take place under controlled neuronal conditions, regulated by subcellular elements such as epigenetic regulation, proteasomal degradation and neuromodulatory signals. Here, we review current understanding of the different forms of synaptic plasticity and its regulatory mechanisms in the hippocampus, a brain region critical for memory formation. We also discuss expression of plasticity in hippocampal CA2 area, a long-overlooked narrow hippocampal subfield and the behavioural correlate of STC. Lastly, we put forth perspectives for an integrated view of memory representation in synapses.
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Affiliation(s)
- Mohammad Zaki Bin Ibrahim
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Life Sciences Institute Neurobiology Programme, National University of Singapore, Singapore
| | - Amrita Benoy
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Life Sciences Institute Neurobiology Programme, National University of Singapore, Singapore
| | - Sreedharan Sajikumar
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Life Sciences Institute Neurobiology Programme, National University of Singapore, Singapore.,Healthy Longevity Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
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9
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Feyder M, Plewnia C, Lieberman OJ, Spigolon G, Piccin A, Urbina L, Dehay B, Li Q, Nilsson P, Altun M, Santini E, Sulzer D, Bezard E, Borgkvist A, Fisone G. Involvement of Autophagy in Levodopa-Induced Dyskinesia. Mov Disord 2021; 36:1137-1146. [PMID: 33460487 PMCID: PMC8248404 DOI: 10.1002/mds.28480] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Revised: 12/02/2020] [Accepted: 12/04/2020] [Indexed: 12/25/2022] Open
Abstract
Background Autophagy is intensively studied in cancer, metabolic and neurodegenerative diseases, but little is known about its role in pathological conditions linked to altered neurotransmission. We examined the involvement of autophagy in levodopa (l‐dopa)‐induced dyskinesia, a frequent motor complication developed in response to standard dopamine replacement therapy in parkinsonian patients. Methods We used mouse and non‐human primate models of Parkinson's disease to examine changes in autophagy associated with chronic l‐dopa administration and to establish a causative link between impaired autophagy and dyskinesia. Results We found that l‐dopa‐induced dyskinesia is associated with accumulation of the autophagy‐specific substrate p62, a marker of autophagy deficiency. Increased p62 was observed in a subset of projection neurons located in the striatum and depended on l‐dopa‐mediated activation of dopamine D1 receptors, and mammalian target of rapamycin. Inhibition of mammalian target of rapamycin complex 1 with rapamycin counteracted the impairment of autophagy produced by l‐dopa, and reduced dyskinesia. The anti‐dyskinetic effect of rapamycin was lost when autophagy was constitutively suppressed in D1 receptor‐expressing striatal neurons, through inactivation of the autophagy‐related gene protein 7. Conclusions These findings indicate that augmented responsiveness at D1 receptors leads to dysregulated autophagy, and results in the emergence of l‐dopa‐induced dyskinesia. They further suggest the enhancement of autophagy as a therapeutic strategy against dyskinesia. © 2021 The Authors. Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society
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Affiliation(s)
- Michael Feyder
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Carina Plewnia
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Ori J Lieberman
- Departments of Neurology, Pharmacology and Psychiatry, Columbia University, and New York State Psychiatric Institute, New York, New York, USA
| | - Giada Spigolon
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Alessandro Piccin
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Lidia Urbina
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Benjamin Dehay
- Univ. Bordeaux, CNRS, IMN, UMR 5293, Bordeaux, F-33000, France
| | - Qin Li
- Motac Neuroscience Ltd, Manchester, United Kingdom.,Institute of Laboratory Animal Sciences & China Academy of Medical Sciences, Beijing, China
| | - Per Nilsson
- Department of Neurobiology, Care Sciences and Society, Center for Alzheimer Research, Division of Neurogeriatrics, Karolinska Institutet, Stockholm, Sweden
| | - Mikael Altun
- Science for Life Laboratory, Department of Laboratory Medicine, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden
| | - Emanuela Santini
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden.,Departments of Neurology, Pharmacology and Psychiatry, Columbia University, and New York State Psychiatric Institute, New York, New York, USA
| | - David Sulzer
- Departments of Neurology, Pharmacology and Psychiatry, Columbia University, and New York State Psychiatric Institute, New York, New York, USA
| | - Erwan Bezard
- Univ. Bordeaux, CNRS, IMN, UMR 5293, Bordeaux, F-33000, France.,Motac Neuroscience Ltd, Manchester, United Kingdom
| | - Anders Borgkvist
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden.,Departments of Neurology, Pharmacology and Psychiatry, Columbia University, and New York State Psychiatric Institute, New York, New York, USA
| | - Gilberto Fisone
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
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10
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Gureev AP, Popov VN, Starkov AA. Crosstalk between the mTOR and Nrf2/ARE signaling pathways as a target in the improvement of long-term potentiation. Exp Neurol 2020; 328:113285. [PMID: 32165256 DOI: 10.1016/j.expneurol.2020.113285] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2019] [Revised: 02/22/2020] [Accepted: 03/08/2020] [Indexed: 12/15/2022]
Abstract
In recent years, a significant progress was made in understanding molecular mechanisms of long-term memory. Long-term memory formation requires strengthening of neuronal connections (LTP, long-term potentiation) associated with structural rearrangement of neurons. The key role in the synthesis of proteins essential for these rearrangements belong to mTOR (mammalian target of rapamycin) complexes and signaling pathways involved in mTOR regulation. Suppression of mTOR activity may impair synaptic plasticity and long-term memory, while mTOR activation inhibits autophagy, thereby potentiating amyloidosis and development of Alzheimer's disease (AD) accompanied by irreversible memory loss. Because of this, suppression/inhibition of mTOR might have unpredictable consequences on memory. The Nrf2/ARE signaling pathway affects almost all mitochondrial processes. The activation of this pathway improves memory and exhibits therapeutic effect in AD. In this review, we discuss the crosstalk between the Nrf2/ARE signaling and mTOR in the maintenance of synaptic plasticity. Nrf2 pathway can be activated by pharmacological agents and by changes in mitochondria functioning accompanying various neuronal dysfunctions.
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Affiliation(s)
- Artem P Gureev
- Department of Genetics, Cytology and Bioengineering, Voronezh State University, Voronezh, Russia
| | - Vasily N Popov
- Department of Genetics, Cytology and Bioengineering, Voronezh State University, Voronezh, Russia; Voronezh State University of Engineering Technologies, Voronezh, Russia
| | - Anatoly A Starkov
- Feil Family Brain and Mind Research Institute, Weill Cornell Medicine, New York, NY, USA.
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11
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Ishizuka Y, Bramham CR. A simple DMSO-based method for cryopreservation of primary hippocampal and cortical neurons. J Neurosci Methods 2020; 333:108578. [DOI: 10.1016/j.jneumeth.2019.108578] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Revised: 12/20/2019] [Accepted: 12/30/2019] [Indexed: 01/19/2023]
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12
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Wu H, Zhou J, Zhu T, Cohen I, Dictenberg J. A kinesin adapter directly mediates dendritic mRNA localization during neural development in mice. J Biol Chem 2020; 295:6605-6628. [PMID: 32111743 DOI: 10.1074/jbc.ra118.005616] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Revised: 08/19/2019] [Indexed: 11/06/2022] Open
Abstract
Motor protein-based active transport is essential for mRNA localization and local translation in animal cells, yet how mRNA granules interact with motor proteins remains poorly understood. Using an unbiased yeast two-hybrid screen for interactions between murine RNA-binding proteins (RBPs) and motor proteins, here we identified protein interaction with APP tail-1 (PAT1) as a potential direct adapter between zipcode-binding protein 1 (ZBP1, a β-actin RBP) and the kinesin-I motor complex. The amino acid sequence of mouse PAT1 is similar to that of the kinesin light chain (KLC), and we found that PAT1 binds to KLC directly. Studying PAT1 in mouse primary hippocampal neuronal cultures from both sexes and using structured illumination microscopic imaging of these neurons, we observed that brain-derived neurotrophic factor (BDNF) enhances co-localization of dendritic ZBP1 and PAT1 within granules that also contain kinesin-I. PAT1 is essential for BDNF-stimulated neuronal growth cone development and dendritic protrusion formation, and we noted that ZBP1 and PAT1 co-locate along with β-actin mRNA in actively transported granules in living neurons. Acute disruption of the PAT1-ZBP1 interaction in neurons with PAT1 siRNA or a dominant-negative ZBP1 construct diminished localization of β-actin mRNA but not of Ca2+/calmodulin-dependent protein kinase IIα (CaMKIIα) mRNA in dendrites. The aberrant β-actin mRNA localization resulted in abnormal dendritic protrusions and growth cone dynamics. These results suggest a critical role for PAT1 in BDNF-induced β-actin mRNA transport during postnatal development and reveal a new molecular mechanism for mRNA localization in vertebrates.
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Affiliation(s)
- Hao Wu
- Department of Biological Sciences, Hunter College, City University of New York, New York, New York 10065 .,Biology Program, Graduate School and University Center, City University of New York, New York, New York 10016
| | - Jing Zhou
- Biology Program, Graduate School and University Center, City University of New York, New York, New York 10016.,Biology Department, Lehman College, City University of New York, Bronx, New York 10468
| | - Tianhui Zhu
- Department of Biological Sciences, Hunter College, City University of New York, New York, New York 10065.,Biology Program, Graduate School and University Center, City University of New York, New York, New York 10016
| | - Ivan Cohen
- Department of Biological Sciences, Hunter College, City University of New York, New York, New York 10065
| | - Jason Dictenberg
- Cell Biology, State University of New York Downstate, Brooklyn, New York 11226 .,Biotechnology Incubator, AccelBio, Brooklyn, New York 11226
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13
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BDNF induces in vivo long-lasting enhancement of synaptic transmission and structural reorganization at the hippocampal mossy fibers in a transcription and translation-independent manner. Neurobiol Learn Mem 2020; 167:107125. [DOI: 10.1016/j.nlm.2019.107125] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 10/28/2019] [Accepted: 11/20/2019] [Indexed: 12/27/2022]
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14
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Clark NM, Shen Z, Briggs SP, Walley JW, Kelley DR. Auxin Induces Widespread Proteome Remodeling in Arabidopsis Seedlings. Proteomics 2019; 19:e1900199. [DOI: 10.1002/pmic.201900199] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Revised: 07/25/2019] [Indexed: 01/24/2023]
Affiliation(s)
- Natalie M. Clark
- Department of Plant Pathology and MicrobiologyIowa State University Ames IA 92093 USA
| | - Zhouxin Shen
- Section of Cell and Developmental BiologyUniversity of CaliforniaSan Diego La Jolla CA 92093 USA
| | - Steven P. Briggs
- Section of Cell and Developmental BiologyUniversity of CaliforniaSan Diego La Jolla CA 92093 USA
| | - Justin W. Walley
- Department of Plant Pathology and MicrobiologyIowa State University Ames IA 92093 USA
| | - Dior R. Kelley
- Department of Genetics, Development and Cell BiologyIowa State University Ames IA 50011 USA
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15
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Park H, Kaang BK. Balanced actions of protein synthesis and degradation in memory formation. ACTA ACUST UNITED AC 2019; 26:299-306. [PMID: 31416903 PMCID: PMC6699412 DOI: 10.1101/lm.048785.118] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Accepted: 07/02/2019] [Indexed: 11/24/2022]
Abstract
Storage of long-term memory requires not only protein synthesis but also protein degradation. In this article, we overview recent publications related to this issue, stressing that the balanced actions of protein synthesis and degradation are critical for long-term memory formation. We particularly focused on the brain-derived neurotrophic factor signaling that leads to protein synthesis; proteasome- and autophagy-dependent protein degradation that removes molecular constraints; the role of Fragile X mental retardation protein in translational suppression; and epigenetic modifications that control gene expression at the genomic level. Numerous studies suggest that an imbalance between protein synthesis and degradation leads to intellectual impairment and cognitive disorders.
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Affiliation(s)
- Hyungju Park
- Department of Structure and Function of Neural Network, Korea Brain Research Institute (KBRI), Daegu 41062, South Korea.,Department of Brain and Cognitive Sciences, DGIST, Daegu 42988, South Korea
| | - Bong-Kiun Kaang
- School of Biological Sciences, Seoul National University, Seoul 08826, South Korea
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16
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Chang W, Huang D, Lo YM, Tee Q, Kuo P, Wu JS, Huang W, Shen S. Protective Effect of Caffeic Acid against Alzheimer's Disease Pathogenesis via Modulating Cerebral Insulin Signaling, β-Amyloid Accumulation, and Synaptic Plasticity in Hyperinsulinemic Rats. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:7684-7693. [PMID: 31203623 DOI: 10.1021/acs.jafc.9b02078] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
This study investigated the alleviative effect of caffeic acid (CA) on Alzheimer's disease (AD) pathogenesis and associated mechanisms in high-fat (HF) diet-induced hyperinsulinemic rats. The results of a Morris water maze indicated that, by administrating CA (30 mg/kg b.w./day) for 30 weeks, the memory and learning impairments in HF-induced hyperinsulinemic rats were significantly ameliorated. CA also enhanced superoxide dismutase and glutathione free radical scavenger activity in hyperinsulinemic rats. The Western blot data further confirmed that protein expressions of phosphorylated-glycogen synthase kinase 3β (GSK3β) were significantly increased, whereas the expression of phosphorylated-tau protein decreased in the hippocampus of rats administered with CA in comparison with the HF group. Moreover, the expression of amyloid precursor protein (APP) and β-site APP cleaving enzyme were attenuated, subsequently lowering the level of β-amyloid 1-42 (Aβ 1-42) in the hippocampus of CA-treated hyperinsulinemic rats. CA also significantly increased the expression of synaptic proteins in HF rats.
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Affiliation(s)
- Wenchang Chang
- Department of Food Science , National Chiayi University , No. 300, Syuefu Road , Chiayi City 60004 , Taiwan
| | - Dawei Huang
- Department of Biotechnology and Food Technology , Southern Taiwan University of Science and Technology , No. 1, Nan-Tai Street , Yungkang District, Tainan City 710 , Taiwan
| | - Y Martin Lo
- Institute for Advanced Study , Shenzhen University , 3688 Nanhai Blvd , Nanshan District, Shenzhen 518060 , China
| | - Qinqiao Tee
- Graduate Program of Nutrition Science , National Taiwan Normal University , No. 162, Sec. 1, Heping East Road , Taipei 10610 , Taiwan
| | - Poling Kuo
- Graduate Program of Nutrition Science , National Taiwan Normal University , No. 162, Sec. 1, Heping East Road , Taipei 10610 , Taiwan
| | - James Swibea Wu
- Graduate Institute of Food Science and Technology , National Taiwan University , P.O. Box 23-14, Taipei 10672 , Taiwan
| | - Wenchung Huang
- Graduate Institute of Health Industry Technology , Chang Gung University of Science and Technology , No. 261, Wenhua First Road , Guishan District, Taoyuan 33303 , Taiwan
| | - Szuchuan Shen
- Graduate Program of Nutrition Science , National Taiwan Normal University , No. 162, Sec. 1, Heping East Road , Taipei 10610 , Taiwan
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17
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Tikhonov NC, Plotnikov GP, Krasnov VV, Grigoryev EV, Shukevich DL. [Pharmacological neuroprotection for intracerebral hemorrhages in patients with polyvascular disease]. Zh Nevrol Psikhiatr Im S S Korsakova 2019; 118:19-24. [PMID: 30698555 DOI: 10.17116/jnevro201811812119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
AIM To evaluate the efficacy of pharmacological neuroprotection with protein, peptide and metabolic drugs as a part of basic intensive therapy for intracerebral hemorrhages in patients with polyvascular disease (PolyVD). MATERIAL AND METHODS Twenty-eight male patients with PolyVD referred to surgical treatment of intracerebral hemorrhages, who were on mechanical ventilation and received basic intensive care, were included in a single center prospective observational study. All patients were assigned either to routine daily i/v infusions of 10 ml cytoflavin in 0.9% sodium chloride solution for 10 days (n=12) or 0,2 mg daily of cellex subcutaneously (n=16). Central hemodynamics, intracranial pressure, and continuous indicators of the linear velocity of blood circulation were assessed. All patients underwent SOFA scoring. The markers of brain damage, including protein S-100-β (ng/l), antioxidant enzyme activity of superoxide dismutase (SOD) U/gr/Hb), glutathione peroxidase (U/gr/Hb) in the systemic circulation and jugular vein on the lesion side were determined. The length of stay in the intensive care unit and the number of nights were calculated. Mortality was assessed in both groups. RESULTS Intracranial hypertension in both groups tended to subnormal parameters by 3-5 days. Vasospasm was reduced more rapidly (by the 3rd day) in the cytoflavin group compared to the cellex group (174 [152; 189] vs. 205 [182; 219], respectively). The latter demonstrated the less extent of cerebral damage according to S100 protein concentration. A comparative analysis showed that the antioxidant activity was significantly higher in the cytoflavin group. The cellex group demonstrated a pronounced trend towards the regression of neurological deficit on the NIHSS (p=0,025). The number of fatal outcomes and nights spent in the ICU were similar in both groups. The in-hospital stay was insignificantly shorter in the cellex group. CONCLUSION It is recommended to add both antioxidant and neuropeptide pharmacological neuroprotectors in the routine intensive therapy for treating intracerebral hematomas in patients with PolyVD after surgical management.
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Affiliation(s)
- N C Tikhonov
- Kemerovo Regional Clinical Cardiology Dispensary Kemerovo, Russia
| | - G P Plotnikov
- State Budgetary Institution 'Research Institute for Complex Issues of Cardiovascular Diseases', Kemerovo, Russia
| | - V V Krasnov
- Kemerovo Regional Clinical Cardiology Dispensary Kemerovo, Russia
| | - E V Grigoryev
- State Budgetary Institution 'Research Institute for Complex Issues of Cardiovascular Diseases', Kemerovo, Russia
| | - D L Shukevich
- State Budgetary Institution 'Research Institute for Complex Issues of Cardiovascular Diseases', Kemerovo, Russia
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18
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Eremenko E, Mittal K, Berner O, Kamenetsky N, Nemirovsky A, Elyahu Y, Monsonego A. BDNF-producing, amyloid β-specific CD4 T cells as targeted drug-delivery vehicles in Alzheimer's disease. EBioMedicine 2019; 43:424-434. [PMID: 31085101 PMCID: PMC6557914 DOI: 10.1016/j.ebiom.2019.04.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Revised: 04/04/2019] [Accepted: 04/08/2019] [Indexed: 01/20/2023] Open
Abstract
BACKGROUND The delivery of therapeutic proteins to selected sites within the central nervous system (CNS) parenchyma is a major challenge in the treatment of various neurodegenerative disorders. As brain-derived neurotrophic factor (BDNF) is reduced in the brain of people with Alzheimer's disease (AD) and its administration has shown promising therapeutic effects in mouse model of the disease, we generated a novel platform for T cell-based BDNF delivery into the brain parenchyma. METHODS We generated amyloid beta-protein (Aβ)-specific CD4 T cells (Aβ-T cells), genetically engineered to express BDNF, and injected them intracerebroventricularly into the 5XFAD mouse model of AD. FINDINGS The BDNF-secreting Aβ-T cells migrated efficiently to amyloid plaques, where they significantly increased the levels of BDNF, its receptor TrkB, and various synaptic proteins known to be reduced in AD. Furthermore, the injected mice demonstrated reduced levels of beta-secretase 1 (BACE1)-a protease essential in the cleavage process of the amyloid precursor protein-and ameliorated amyloid pathology and inflammation within the brain parenchyma. INTERPRETATION A T cell-based delivery of proteins into the brain can serve as a platform to modulate neurotoxic inflammation and to promote neuronal repair in neurodegenerative diseases.
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Affiliation(s)
- Ekaterina Eremenko
- The Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; Regenerative Medicine and Stem Cell Research Center, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; The National Institute of Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel
| | - Kritika Mittal
- The Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; Regenerative Medicine and Stem Cell Research Center, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; The National Institute of Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel
| | - Omer Berner
- The Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; Regenerative Medicine and Stem Cell Research Center, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; The National Institute of Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel
| | - Nikita Kamenetsky
- The Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; Regenerative Medicine and Stem Cell Research Center, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; The National Institute of Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel
| | - Anna Nemirovsky
- The Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; Regenerative Medicine and Stem Cell Research Center, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; The National Institute of Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel
| | - Yehezqel Elyahu
- The Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; Regenerative Medicine and Stem Cell Research Center, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; The National Institute of Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel
| | - Alon Monsonego
- The Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; Regenerative Medicine and Stem Cell Research Center, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; The National Institute of Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel.
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19
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Bowling HL, Nayak S, Deinhardt K. Proteomic Approaches to Dissect Neuronal Signalling Pathways. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1140:469-475. [PMID: 31347065 DOI: 10.1007/978-3-030-15950-4_27] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
With an increasing awareness of mental health issues and neurological disorders, "understanding the brain" is one of the biggest current challenges in biological research. This has been recognised by both governments and funding agencies, and it includes the need to understand connectivity of brain regions and coordinated network activity, as well as cellular and molecular mechanisms at play. In this chapter, we will describe how we have taken advantage of different proteomic techniques to unravel molecular mechanisms underlying two modulators of neuronal function: Neurotrophins and antipsychotics.
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Affiliation(s)
| | - Shruti Nayak
- Proteomics Laboratory, Alexandria Center for Life Science, NYU Langone, New York, NY, USA
| | - Katrin Deinhardt
- Biological Sciences, Faculty of Environmental and Life Sciences, University of Southampton, Southampton, UK.
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20
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Fischer DL, Sortwell CE. BDNF provides many routes toward STN DBS-mediated disease modification. Mov Disord 2018; 34:22-34. [PMID: 30440081 PMCID: PMC6587505 DOI: 10.1002/mds.27535] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 09/18/2018] [Accepted: 09/23/2018] [Indexed: 01/05/2023] Open
Abstract
The concept that subthalamic nucleus deep brain stimulation (STN DBS) may be disease modifying in Parkinson's disease (PD) is controversial. Several clinical trials that enrolled subjects with late‐stage PD have come to disparate conclusions on this matter. In contrast, some clinical studies in early‐ to midstage subjects have suggested a disease‐modifying effect. Dopaminergic innervation of the putamen is essentially absent in PD subjects within 4 years after diagnosis, indicating that any neuroprotective therapy, including STN DBS, will require intervention within the immediate postdiagnosis interval. Preclinical prevention and early intervention paradigms support a neuroprotective effect of STN DBS on the nigrostriatal system via increased brain‐derived neurotrophic factor (BDNF). STN DBS‐induced increases in BDNF provide a multitude of mechanisms capable of ameliorating dysfunction and degeneration in the parkinsonian brain. A biomarker for measuring brain‐derived neurotrophic factor‐trkB signaling, though, is not available for clinical research. If a prospective clinical trial were to examine whether STN DBS is disease modifying, we contend the strongest rationale is not dependent on a preclinical neuroprotective effect per se, but on the myriad potential mechanisms whereby STN DBS‐elicited brain‐derived neurotrophic factor‐trkB signaling could provide disease modification. © 2018 The Authors. Movement Disorders published by Wiley Periodicals, Inc. on behalf of International Parkinson and Movement Disorder Society.
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Affiliation(s)
- D Luke Fischer
- Department of Translational Science & Molecular Medicine, College of Human Medicine, Michigan State University, Grand Rapids, Michigan, USA
| | - Caryl E Sortwell
- Department of Translational Science & Molecular Medicine, College of Human Medicine, Michigan State University, Grand Rapids, Michigan, USA.,Hauenstein Neuroscience Center, Mercy Health St. Mary's, Grand Rapids, Michigan, USA
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21
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Yun D, Zhuang Y, Kreutz MR, Behnisch T. The role of 19S proteasome associated deubiquitinases in activity-dependent hippocampal synaptic plasticity. Neuropharmacology 2018; 133:354-365. [DOI: 10.1016/j.neuropharm.2018.01.043] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Revised: 12/24/2017] [Accepted: 01/29/2018] [Indexed: 12/11/2022]
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22
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Liu HH, McClatchy DB, Schiapparelli L, Shen W, Yates JR, Cline HT. Role of the visual experience-dependent nascent proteome in neuronal plasticity. eLife 2018; 7:e33420. [PMID: 29412139 PMCID: PMC5815848 DOI: 10.7554/elife.33420] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Accepted: 02/05/2018] [Indexed: 01/02/2023] Open
Abstract
Experience-dependent synaptic plasticity refines brain circuits during development. To identify novel protein synthesis-dependent mechanisms contributing to experience-dependent plasticity, we conducted a quantitative proteomic screen of the nascent proteome in response to visual experience in Xenopus optic tectum using bio-orthogonal metabolic labeling (BONCAT). We identified 83 differentially synthesized candidate plasticity proteins (CPPs). The CPPs form strongly interconnected networks and are annotated to a variety of biological functions, including RNA splicing, protein translation, and chromatin remodeling. Functional analysis of select CPPs revealed the requirement for eukaryotic initiation factor three subunit A (eIF3A), fused in sarcoma (FUS), and ribosomal protein s17 (RPS17) in experience-dependent structural plasticity in tectal neurons and behavioral plasticity in tadpoles. These results demonstrate that the nascent proteome is dynamic in response to visual experience and that de novo synthesis of machinery that regulates RNA splicing and protein translation is required for experience-dependent plasticity.
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Affiliation(s)
- Han-Hsuan Liu
- The Dorris Neuroscience CenterThe Scripps Research InstituteLa JollaUnited States
- Department of NeuroscienceThe Scripps Research InstituteLa JollaUnited States
- Kellogg School of Science and TechnologyThe Scripps Research InstituteLa JollaUnited States
| | - Daniel B McClatchy
- Department of Molecular MedicineThe Scripps Research InstituteLa JollaUnited States
| | - Lucio Schiapparelli
- The Dorris Neuroscience CenterThe Scripps Research InstituteLa JollaUnited States
- Department of NeuroscienceThe Scripps Research InstituteLa JollaUnited States
| | - Wanhua Shen
- The Dorris Neuroscience CenterThe Scripps Research InstituteLa JollaUnited States
- Department of NeuroscienceThe Scripps Research InstituteLa JollaUnited States
- Zhejiang Key Laboratory of Organ Development and Regeneration, College of Life and Environmental SciencesHangzhou Normal UniversityHangzhouChina
| | - John R Yates
- Department of NeuroscienceThe Scripps Research InstituteLa JollaUnited States
- Department of Molecular MedicineThe Scripps Research InstituteLa JollaUnited States
| | - Hollis T Cline
- The Dorris Neuroscience CenterThe Scripps Research InstituteLa JollaUnited States
- Department of NeuroscienceThe Scripps Research InstituteLa JollaUnited States
- Kellogg School of Science and TechnologyThe Scripps Research InstituteLa JollaUnited States
- Department of Molecular MedicineThe Scripps Research InstituteLa JollaUnited States
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23
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Targeting the intracellular signaling "STOP" and "GO" pathways for the treatment of alcohol use disorders. Psychopharmacology (Berl) 2018; 235:1727-1743. [PMID: 29654346 PMCID: PMC5949137 DOI: 10.1007/s00213-018-4882-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Accepted: 03/12/2018] [Indexed: 12/12/2022]
Abstract
In recent years, research has identified the molecular and neural substrates underlying the transition of moderate "social" consumption of alcohol to the characteristic alcohol use disorder (AUD) phenotypes including excessive and compulsive alcohol use which we define in the review as the GO signaling pathways. In addition, growing evidence points to the existence of molecular mechanisms that keep alcohol consumption in check and that confer resilience for the development of AUD which we define herein as the STOP signaling pathways. In this review, we focus on examples of the GO and the STOP intracellular signaling pathways and discuss our current knowledge of how manipulations of these pathways may be used for the treatment of AUD.
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24
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The RNA-Binding Protein hnRNP K Mediates the Effect of BDNF on Dendritic mRNA Metabolism and Regulates Synaptic NMDA Receptors in Hippocampal Neurons. eNeuro 2017; 4:eN-NWR-0268-17. [PMID: 29255796 PMCID: PMC5732018 DOI: 10.1523/eneuro.0268-17.2017] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 10/25/2017] [Accepted: 11/09/2017] [Indexed: 11/21/2022] Open
Abstract
Brain-derived neurotrophic factor (BDNF) is an important mediator of long-term synaptic potentiation (LTP) in the hippocampus. The local effects of BDNF depend on the activation of translation activity, which requires the delivery of transcripts to the synapse. In this work, we found that neuronal activity regulates the dendritic localization of the RNA-binding protein heterogeneous nuclear ribonucleoprotein K (hnRNP K) in cultured rat hippocampal neurons by stimulating BDNF-Trk signaling. Microarray experiments identified a large number of transcripts that are coimmunoprecipitated with hnRNP K, and about 60% of these transcripts are dissociated from the protein upon stimulation of rat hippocampal neurons with BDNF. In vivo studies also showed a role for TrkB signaling in the dissociation of transcripts from hnRNP K upon high-frequency stimulation (HFS) of medial perforant path-granule cell synapses of male rat dentate gyrus (DG). Furthermore, treatment of rat hippocampal synaptoneurosomes with BDNF decreased the coimmunoprecipitation of hnRNP K with mRNAs coding for glutamate receptor subunits, Ca2+- and calmodulin-dependent protein kinase IIβ (CaMKIIβ) and BDNF. Downregulation of hnRNP K impaired the BDNF-induced enhancement of NMDA receptor (NMDAR)-mediated mEPSC, and similar results were obtained upon inhibition of protein synthesis with cycloheximide. The results demonstrate that BDNF regulates specific populations of hnRNP-associated mRNAs in neuronal dendrites and suggests an important role of hnRNP K in BDNF-dependent forms of synaptic plasticity.
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Niere F, Raab-Graham KF. mTORC1 Is a Local, Postsynaptic Voltage Sensor Regulated by Positive and Negative Feedback Pathways. Front Cell Neurosci 2017; 11:152. [PMID: 28611595 PMCID: PMC5447718 DOI: 10.3389/fncel.2017.00152] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 05/09/2017] [Indexed: 12/11/2022] Open
Abstract
The mammalian/mechanistic target of rapamycin complex 1 (mTORC1) serves as a regulator of mRNA translation. Recent studies suggest that mTORC1 may also serve as a local, voltage sensor in the postsynaptic region of neurons. Considering biochemical, bioinformatics and imaging data, we hypothesize that the activity state of mTORC1 dynamically regulates local membrane potential by promoting and repressing protein synthesis of select mRNAs. Our hypothesis suggests that mTORC1 uses positive and negative feedback pathways, in a branch-specific manner, to maintain neuronal excitability within an optimal range. In some dendritic branches, mTORC1 activity oscillates between the "On" and "Off" states. We define this as negative feedback. In contrast, positive feedback is defined as the pathway that leads to a prolonged depolarized or hyperpolarized resting membrane potential, whereby mTORC1 activity is constitutively on or off, respectively. We propose that inactivation of mTORC1 increases the expression of voltage-gated potassium alpha (Kv1.1 and 1.2) and beta (Kvβ2) subunits, ensuring that the membrane resets to its resting membrane potential after experiencing increased synaptic activity. In turn, reduced mTORC1 activity increases the protein expression of syntaxin-1A and promotes the surface expression of the ionotropic glutamate receptor N-methyl-D-aspartate (NMDA)-type subunit 1 (GluN1) that facilitates increased calcium entry to turn mTORC1 back on. Under conditions such as learning and memory, mTORC1 activity is required to be high for longer periods of time. Thus, the arm of the pathway that promotes syntaxin-1A and Kv1 protein synthesis will be repressed. Moreover, dendritic branches that have low mTORC1 activity with increased Kv expression would balance dendrites with constitutively high mTORC1 activity, allowing for the neuron to maintain its overall activity level within an ideal operating range. Finally, such a model suggests that recruitment of more positive feedback dendritic branches within a neuron is likely to lead to neurodegenerative disorders.
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Affiliation(s)
- Farr Niere
- Department of Physiology and Pharmacology, Wake Forest School of MedicineWinston-Salem, NC, United States
| | - Kimberly F. Raab-Graham
- Department of Physiology and Pharmacology, Wake Forest School of MedicineWinston-Salem, NC, United States
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Radiske A, Rossato JI, Gonzalez MC, Köhler CA, Bevilaqua LR, Cammarota M. BDNF controls object recognition memory reconsolidation. Neurobiol Learn Mem 2017; 142:79-84. [PMID: 28274823 DOI: 10.1016/j.nlm.2017.02.018] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Revised: 02/20/2017] [Accepted: 02/25/2017] [Indexed: 01/16/2023]
Abstract
Reconsolidation restabilizes memory after reactivation. Previously, we reported that the hippocampus is engaged in object recognition memory reconsolidation to allow incorporation of new information into the original engram. Here we show that BDNF is sufficient for this process, and that blockade of BDNF function in dorsal CA1 impairs updating of the reactivated recognition memory trace.
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Affiliation(s)
- Andressa Radiske
- Memory Research Laboratory, Brain Institute, Federal University of Rio Grande do Norte, Av. Nascimento de Castro 2155, RN 59056-450 Natal, Brazil
| | - Janine I Rossato
- Memory Research Laboratory, Brain Institute, Federal University of Rio Grande do Norte, Av. Nascimento de Castro 2155, RN 59056-450 Natal, Brazil
| | - Maria Carolina Gonzalez
- Memory Research Laboratory, Brain Institute, Federal University of Rio Grande do Norte, Av. Nascimento de Castro 2155, RN 59056-450 Natal, Brazil
| | - Cristiano A Köhler
- Memory Research Laboratory, Brain Institute, Federal University of Rio Grande do Norte, Av. Nascimento de Castro 2155, RN 59056-450 Natal, Brazil
| | - Lia R Bevilaqua
- Memory Research Laboratory, Brain Institute, Federal University of Rio Grande do Norte, Av. Nascimento de Castro 2155, RN 59056-450 Natal, Brazil
| | - Martín Cammarota
- Memory Research Laboratory, Brain Institute, Federal University of Rio Grande do Norte, Av. Nascimento de Castro 2155, RN 59056-450 Natal, Brazil.
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Hannan MA, Mohibbullah M, Hong YK, Moon IS. Proteomic Analysis of the Neurotrophic Effect of Gelidium amansii in Primary Cultured Neurons. J Med Food 2017; 20:279-287. [DOI: 10.1089/jmf.2016.3848] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Affiliation(s)
- Md. Abdul Hannan
- Department of Biotechnology, Pukyong National University, Busan, Republic of Korea
- Department of Biochemistry and Molecular Biology, Bangladesh Agricultural University, Mymensingh, Bangladesh
| | - Md. Mohibbullah
- Department of Biotechnology, Pukyong National University, Busan, Republic of Korea
| | - Yong-Ki Hong
- Department of Biotechnology, Pukyong National University, Busan, Republic of Korea
| | - Il Soo Moon
- Department of Anatomy, Dongguk University Graduate School of Medicine, Gyeongju, Republic of Korea
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Abstract
UNLABELLED Studying compensatory capacity of the brain is a pressing issue. To resolve it, diversified experiments should be conducted providing an idea of the underlying mechanisms and possibilities of functional restoration. AIM To determine the effect of unilateral electrocoagulation of supraoptic (SO) and suprachiasmatic (SCH) hypothalamic nuclei on the appearance of the electroretinogram (ERG). MATERIAL AND METHODS We conducted chronic experiments on awake rabbits with a total duration of 30 days. RESULTS The study revealed considerable changes in the total ERG amplitude (reduction) as well as the amplitudes of a- and b-waves. Thus, for the first 15-30 minutes after coagulation the b-wave showed an increase, while the a-wave appeared completely suppressed. Longer postcoagulation periods were associated with gradual, though incomplete, amplitude regain of the latter. CONCLUSION The obtained data suggest that the process of ERG recovery involves compensatory mechanisms of the SO and SCH nuclei that enable partial recovery of the neurotransmitter activity of the retina.
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Affiliation(s)
- N M Rzaeva
- A.I. Karayev Institute of Physiology, National Academy of Sciences, Baku, Azerbaijan, 1100
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29
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Abstract
Brain-derived neurotrophic factor (BDNF) belongs to a family of small secreted proteins that also include nerve growth factor, neurotrophin 3, and neurotrophin 4. BDNF stands out among all neurotrophins by its high expression levels in the brain and its potent effects at synapses. Several aspects of BDNF biology such as transcription, processing, and secretion are regulated by synaptic activity. Such observations prompted the suggestion that BDNF may regulate activity-dependent forms of synaptic plasticity such as long-term potentiation (LTP), a sustained enhancement of excitatory synaptic efficacy thought to underlie learning and memory. Here, we will review the evidence pointing to a fundamental role of this neurotrophin in LTP, especially within the hippocampus. Prominent questions in the field, including the release and action sites of BDNF during LTP, as well as the signaling and molecular mechanisms involved, will also be addressed. The diverse effects of BDNF at excitatory synapses are determined by the activation of TrkB receptors and downstream signaling pathways, and the functions, typically opposing in nature, of its immature form (proBDNF). The activation of p75NTR receptors by proBDNF and the implications for long-term depression will also be addressed. Finally, we discuss the synergy between TrkB and glucocorticoid receptor signaling to determine cellular responses to stress.
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Affiliation(s)
- G Leal
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
| | - C R Bramham
- K.G. Jebsen Center for Neuropsychiatric Disorders, University of Bergen, Bergen, Norway
| | - C B Duarte
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal; University of Coimbra, Coimbra, Portugal.
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Kornilovskiy IM, Sultanova AI, Burtsev AA. [Riboflavin photoprotection with cross-linking effect in photorefractive ablation of the cornea]. Vestn Oftalmol 2016; 132:37-41. [PMID: 27456563 DOI: 10.17116/oftalma2016132337-41] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
UNLABELLED Photorefractive ablation is inevitably accompanied by oxidative stress of the cornea and weakening of its biomechanical and photoprotective properties. AIM To validate the expediency of riboflavin use in photorefractive ablation for photoprotection of the cornea and cross-linking. MATERIAL AND METHODS The effects of riboflavin use in photorefractive ablation was first studied in a series of in vitro and in vivo experiments performed on 56 eyes of 28 rabbits, and then on 232 eyes of 142 patients with different degrees of myopia. Biomechanical testing of corneal samples was performed with Zwick/RoellВZ 2.5/TN1S tensile-testing machine. Transepithelial photorefractive keratectomy (TransPRK) and femtosecond laser-assisted in situ keratomileusis (Femto-LASIK) were performed on Wavelight-Allegretto200, MEL-80, and WaveLight-EX500 excimer laser systems and also VisuMax and WaveLight-FS200 femtosecond lasers. For preliminary examinations, an appropriate set of diagnostic tools was used. RESULTS In vivo experiments have proved that, in the absence of conservative therapy, riboflavin is able to produce both photoprotective and cross-linking effects to the cornea. Corneal syndrome was thus reduced and re-epithelialization after TransPRK accelerated. Biomechanical testing of corneal samples revealed an increase in tolerated load from 12.9±1.4 N to 18.3±1.2 N (p=0.0002) and tensile strength from 8.6±1.7 MPa to 12.4±1.7 MPa (p=0.007). Clinical studies conducted in a group of patients with mild to moderate myopia have also confirmed the photoprotective effect of riboflavin at months 1-12 after TransPRK. There were no significant differences in uncorrected visual acuity (ranged from 0.80±0.16 to 0.85±0.15) and corrected visual acuity at baseline (0.83±0.14). Evaluation of the optical and refractive effect achieved after Femto-LASIK with riboflavin photoprotection in the fellow eye has shown that this technique is not inferior to the traditional one as to its refractive accuracy, but provides better maintenance of biomechanical and photoprotective properties of the cornea. CONCLUSION Photorefractive ablation of the cornea with preliminary saturation of the stroma with riboflavin solution ensures its photoprotection and provides an additional cross-linking effect.
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Affiliation(s)
- I M Kornilovskiy
- National Pirogov Medical Surgical Centre, Ministry of Health of the Russian Federation, 70 Nizhnyaya Pervomayskaya St., Moscow, Russian Federation, 105203
| | - A I Sultanova
- National Centre of Ophthalmology named after acad. Zarifa Aliyeva, 32/15 Javadkhan St., Baku, Azerbaijan, AZ 1114
| | - A A Burtsev
- National Pirogov Medical Surgical Centre, Ministry of Health of the Russian Federation, 70 Nizhnyaya Pervomayskaya St., Moscow, Russian Federation, 105203
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Bowling H, Bhattacharya A, Klann E, Chao MV. Deconstructing brain-derived neurotrophic factor actions in adult brain circuits to bridge an existing informational gap in neuro-cell biology. Neural Regen Res 2016; 11:363-7. [PMID: 27127458 PMCID: PMC4828984 DOI: 10.4103/1673-5374.179031] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Brain-derived neurotrophic factor (BDNF) plays an important role in neurodevelopment, synaptic plasticity, learning and memory, and in preventing neurodegeneration. Despite decades of investigations into downstream signaling cascades and changes in cellular processes, the mechanisms of how BDNF reshapes circuits in vivo remain unclear. This informational gap partly arises from the fact that the bulk of studies into the molecular actions of BDNF have been performed in dissociated neuronal cultures, while the majority of studies on synaptic plasticity, learning and memory were performed in acute brain slices or in vivo. A recent study by Bowling-Bhattacharya et al., measured the proteomic changes in acute adult hippocampal slices following treatment and reported changes in proteins of neuronal and non-neuronal origin that may in concert modulate synaptic release and secretion in the slice. In this paper, we place these findings into the context of existing literature and discuss how they impact our understanding of how BDNF can reshape the brain.
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Affiliation(s)
- Heather Bowling
- Center for Neural Science, New York University, New York, NY, USA
| | - Aditi Bhattacharya
- Center for Brain Development and Repair, Institute for Stem Cell Biology and Regenerative Medicine, Bangalore, India
| | - Eric Klann
- Center for Neural Science, New York University, New York, NY, USA
| | - Moses V Chao
- Departments of Cell Biology, Physiology, and Neuroscience and Psychiatry, Kimmel Center for Biology and Medicine at the Skirball Institute, New York University School of Medicine, New York, NY, USA
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Wang Y, Chen L, Gao Y, Zhang Y, Wang C, Zhou Y, Hu Y, Shi R, Tian Y. Effects of prenatal exposure to cadmium on neurodevelopment of infants in Shandong, China. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2016; 211:67-73. [PMID: 26736057 DOI: 10.1016/j.envpol.2015.12.038] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Revised: 12/09/2015] [Accepted: 12/18/2015] [Indexed: 06/05/2023]
Abstract
Although animal studies suggested that prenatal cadmium exposure can cause neurodevelopmental deficits, little is explored in human populations, or its mechanism. We investigated the association between prenatal cadmium exposures and infants' developmental quotients (DQs) based on the Gesell Developmental Schedules (gross motor, fine motor, adaptive, language, and social domains) at 12 months of age and explored the role of brain-derived neurotrophic factor (BDNF) in prenatal cadmium-induced neurodevelopmental deficits in Shandong, China, by enrolling 300 mothers between September 2010 and December 2011. Maternal blood cadmium concentration (median, 1.24 μg/L) was negatively associated with social domain DQs and BDNF levels in cord serum. A 10-fold increase in maternal cadmium levels was associated with a 5.70-point decrease in social domain DQs, a 4.31-point decrease in BDNF levels. BDNF levels were positively associated with social domain DQs. These data suggest that prenatal low-level cadmium exposure has adverse effects on neurodevelopment. BDNF may play an important role in the decline of social domain DQs induced by prenatal low-level cadmium exposure.
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Affiliation(s)
- Yiwen Wang
- MOE and Shanghai Key Laboratory of Children's Environmental Health, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Department of Neonatology, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Limei Chen
- Department of Environmental Health, School of Public Health, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yu Gao
- Department of Environmental Health, School of Public Health, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yan Zhang
- Department of Environmental Health, School of Public Health, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Caifeng Wang
- Department of Environmental Health, School of Public Health, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yijun Zhou
- Department of Environmental Health, School of Public Health, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yi Hu
- Department of Environmental Health, School of Public Health, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Rong Shi
- Department of Environmental Health, School of Public Health, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Ying Tian
- MOE and Shanghai Key Laboratory of Children's Environmental Health, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Department of Environmental Health, School of Public Health, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
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Shih YH, Tsai SF, Huang SH, Chiang YT, Hughes MW, Wu SY, Lee CW, Yang TT, Kuo YM. Hypertension impairs hippocampus-related adult neurogenesis, CA1 neuron dendritic arborization and long-term memory. Neuroscience 2016; 322:346-57. [PMID: 26921651 DOI: 10.1016/j.neuroscience.2016.02.045] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 02/02/2016] [Accepted: 02/18/2016] [Indexed: 02/07/2023]
Abstract
Hypertension is associated with neurodegenerative diseases and cognitive impairment. Several studies using spontaneous hypertensive rats to study the effect of hypertension on memory performance and adult hippocampal neurogenesis have reached inconsistent conclusions. The contradictory findings may be related to the genetic variability of spontaneous hypertensive rats due to the conventional breeding practices. The objective of this study is to examine the effect of hypertension on hippocampal structure and function in isogenic mice. Hypertension was induced by the '2 kidneys, 1 clip' method (2K1C) which constricted one of the two renal arteries. The blood pressures of 2K1C mice were higher than the sham group on post-operation day 7 and remained high up to day 28. Mice with 2K1C-induced hypertension had impaired long-term, but not short-term, memory. Dendritic complexity of CA1 neurons and hippocampal neurogenesis were reduced by 2K1C-induced hypertension on post-operation day 28. Furthermore, 2K1C decreased the levels of hippocampal brain-derived neurotrophic factor, while blood vessel density and activation status of astrocytes and microglia were not affected. In conclusion, hypertension impairs hippocampus-associated long-term memory, dendritic arborization and neurogenesis, which may be caused by down-regulation of brain-derived neurotrophic factor signaling pathways.
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Affiliation(s)
- Y-H Shih
- Institute of Basic Medical Sciences, National Cheng Kung University, Tainan, Taiwan
| | - S-F Tsai
- Institute of Basic Medical Sciences, National Cheng Kung University, Tainan, Taiwan
| | - S-H Huang
- Department of Cell Biology and Anatomy, National Cheng Kung University, Tainan, Taiwan
| | - Y-T Chiang
- Department of Cell Biology and Anatomy, National Cheng Kung University, Tainan, Taiwan
| | - M W Hughes
- International Research Center of Wound Repair & Regeneration, Institute of Clinical Medicine, National Cheng Kung University, Tainan, Taiwan
| | - S-Y Wu
- Institute of Basic Medical Sciences, National Cheng Kung University, Tainan, Taiwan
| | - C-W Lee
- Institute of Basic Medical Sciences, National Cheng Kung University, Tainan, Taiwan
| | - T-T Yang
- Department of Chinese Medicine for Post-Baccalaureate, I-Shou University, Kaohsiung, Taiwan
| | - Y-M Kuo
- Institute of Basic Medical Sciences, National Cheng Kung University, Tainan, Taiwan; Department of Cell Biology and Anatomy, National Cheng Kung University, Tainan, Taiwan.
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Dieterich DC, Kreutz MR. Proteomics of the Synapse--A Quantitative Approach to Neuronal Plasticity. Mol Cell Proteomics 2016; 15:368-81. [PMID: 26307175 PMCID: PMC4739661 DOI: 10.1074/mcp.r115.051482] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Revised: 07/29/2015] [Indexed: 11/06/2022] Open
Abstract
The advances in mass spectrometry based proteomics in the past 15 years have contributed to a deeper appreciation of protein networks and the composition of functional synaptic protein complexes. However, research on protein dynamics underlying core mechanisms of synaptic plasticity in brain lag far behind. In this review, we provide a synopsis on proteomic research addressing various aspects of synaptic function. We discuss the major topics in the study of protein dynamics of the chemical synapse and the limitations of current methodology. We highlight recent developments and the future importance of multidimensional proteomics and metabolic labeling. Finally, emphasis is given on the conceptual framework of modern proteomics and its current shortcomings in the quest to gain a deeper understanding of synaptic plasticity.
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Affiliation(s)
- Daniela C Dieterich
- From the ‡Institute for Pharmacology and Toxicology, Otto-von-Guericke University Magdeburg, Germany; Research Group Neuralomics, Leibniz Institute for Neurobiology Magdeburg, Germany; ¶Center for Behavioral Brain Sciences (CBBS), Magdeburg, Germany.
| | - Michael R Kreutz
- §RG Neuroplasticity, Leibniz Institute for Neurobiology, Magdeburg, Germany; ¶Center for Behavioral Brain Sciences (CBBS), Magdeburg, Germany.
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BE360, a new selective estrogen receptor modulator, produces antidepressant and antidementia effects through the enhancement of hippocampal cell proliferation in olfactory bulbectomized mice. Behav Brain Res 2016; 297:315-22. [DOI: 10.1016/j.bbr.2015.10.033] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2015] [Revised: 09/02/2015] [Accepted: 10/15/2015] [Indexed: 02/08/2023]
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BONLAC: A combinatorial proteomic technique to measure stimulus-induced translational profiles in brain slices. Neuropharmacology 2015. [PMID: 26205778 DOI: 10.1016/j.neuropharm.2015.07.017] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Stimulus-triggered protein synthesis is critical for brain health and function. However, due to technical hurdles, de novo neuronal translation is predominantly studied in cultured cells, whereas electrophysiological and circuit analyses often are performed in brain slices. The different properties of these two experimental systems create an information gap about stimulus-induced alterations in the expression of new proteins in mature circuits. To address this, we adapted two existing techniques, BONCAT and SILAC, to a combined proteomic technique, BONLAC, for use in acute adult hippocampal slices. Using BDNF-induced protein synthesis as a proof of concept, we found alterations in expression of proteins involved in neurotransmission, trafficking, and cation binding that differed from those found in a similar screen in cultured neurons. Our results indicate important differences between cultured neurons and slices, and suggest that BONLAC could be used to dissect proteomic changes underlying synaptic events in adult circuits. This article is part of the Special Issue entitled 'Synaptopathy--from Biology to Therapy'.
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Differential role of the proteasome in the early and late phases of BDNF-induced facilitation of LTP. J Neurosci 2015; 35:3319-29. [PMID: 25716833 DOI: 10.1523/jneurosci.4521-14.2015] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The neurotrophin brain-derived neurotrophic factor (BDNF) mediates activity-dependent long-term changes of synaptic strength in the CNS. The effects of BDNF are partly mediated by stimulation of local translation, with consequent alterations in the synaptic proteome. The ubiquitin-proteasome system (UPS) also plays an important role in protein homeostasis at the synapse by regulating synaptic activity. However, whether BDNF acts on the UPS to mediate the effects on long-term synaptic potentiation (LTP) has not been investigated. In the present study, we show similar and nonadditive effects of BDNF and proteasome inhibition on the early phase of synaptic potentiation (E-LTP) induced by theta-burst stimulation of rat hippocampal CA1 synapses. The effects of BDNF were blocked by the proteasome activator IU1, suggesting that the neurotrophin acts by decreasing proteasome activity. Accordingly, BDNF downregulated the proteasome activity in cultured hippocampal neurons and in hippocampal synaptoneurosomes. Furthermore, BDNF increased the activity of the deubiquitinating enzyme UchL1 in synaptoneurosomes and upregulated free ubiquitin. In contrast to the effects on posttetanic potentiation, proteasome activity was required for BDNF-mediated LTP. These results show a novel role for BDNF in UPS regulation at the synapse, which is likely to act together with the increased translation activity in the regulation of the synaptic proteome during E-LTP.
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BDNF stimulation of protein synthesis in cortical neurons requires the MAP kinase-interacting kinase MNK1. J Neurosci 2015; 35:972-84. [PMID: 25609615 DOI: 10.1523/jneurosci.2641-14.2015] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Although the MAP kinase-interacting kinases (MNKs) have been known for >15 years, their roles in the regulation of protein synthesis have remained obscure. Here, we explore the involvement of the MNKs in brain-derived neurotrophic factor (BDNF)-stimulated protein synthesis in cortical neurons from mice. Using a combination of pharmacological and genetic approaches, we show that BDNF-induced upregulation of protein synthesis requires MEK/ERK signaling and the downstream kinase, MNK1, which phosphorylates eukaryotic initiation factor (eIF) 4E. Translation initiation is mediated by the interaction of eIF4E with the m(7)GTP cap of mRNA and with eIF4G. The latter interaction is inhibited by the interactions of eIF4E with partner proteins, such as CYFIP1, which acts as a translational repressor. We find that BDNF induces the release of CYFIP1 from eIF4E, and that this depends on MNK1. Finally, using a novel combination of BONCAT and SILAC, we identify a subset of proteins whose synthesis is upregulated by BDNF signaling via MNK1 in neurons. Interestingly, this subset of MNK1-sensitive proteins is enriched for functions involved in neurotransmission and synaptic plasticity. Additionally, we find significant overlap between our subset of proteins whose synthesis is regulated by MNK1 and those encoded by known FMRP-binding mRNAs. Together, our data implicate MNK1 as a key component of BDNF-mediated translational regulation in neurons.
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Ren RJ, Dammer EB, Wang G, Seyfried NT, Levey AI. Proteomics of protein post-translational modifications implicated in neurodegeneration. Transl Neurodegener 2014; 3:23. [PMID: 25671099 PMCID: PMC4323146 DOI: 10.1186/2047-9158-3-23] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Accepted: 10/21/2014] [Indexed: 11/18/2022] Open
Abstract
Mass spectrometry (MS)-based proteomics has developed into a battery of approaches that is exceedingly adept at identifying with high mass accuracy and precision any of the following: oxidative damage to proteins (redox proteomics), phosphorylation (phosphoproteomics), ubiquitination (diglycine remnant proteomics), protein fragmentation (degradomics), and other posttranslational modifications (PTMs). Many studies have linked these PTMs to pathogenic mechanisms of neurodegeneration. To date, identifying PTMs on specific pathology-associated proteins has proven to be a valuable step in the evaluation of functional alteration of proteins and also elucidates biochemical and structural explanations for possible pathophysiological mechanisms of neurodegenerative diseases. This review provides an overview of methods applicable to the identification and quantification of PTMs on proteins and enumerates historic, recent, and potential future research endeavours in the field of proteomics furthering the understanding of PTM roles in the pathogenesis of neurodegeneration.
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Affiliation(s)
- Ru-Jing Ren
- />Department of Neurology,Center for Neurodegenerative Diseases, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - Eric B Dammer
- />Department of Biochemistry, Center for Neurodegenerative Diseases, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - Gang Wang
- />Department of Pharmacology, Center for Neurodegenerative Diseases, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - Nicholas T Seyfried
- />Department of Neurology,Center for Neurodegenerative Diseases, Emory University School of Medicine, Atlanta, GA 30322 USA
- />Department of Biochemistry, Center for Neurodegenerative Diseases, Emory University School of Medicine, Atlanta, GA 30322 USA
- />Emory Proteomics Service Center, Center for Neurodegenerative Diseases, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - Allan I Levey
- />Department of Neurology,Center for Neurodegenerative Diseases, Emory University School of Medicine, Atlanta, GA 30322 USA
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Leal G, Afonso PM, Salazar IL, Duarte CB. Regulation of hippocampal synaptic plasticity by BDNF. Brain Res 2014; 1621:82-101. [PMID: 25451089 DOI: 10.1016/j.brainres.2014.10.019] [Citation(s) in RCA: 286] [Impact Index Per Article: 28.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Revised: 10/10/2014] [Accepted: 10/13/2014] [Indexed: 01/01/2023]
Abstract
The neurotrophin brain-derived neurotrophic factor (BDNF) has emerged as a major regulator of activity-dependent plasticity at excitatory synapses in the mammalian central nervous system. In particular, much attention has been given to the role of the neurotrophin in the regulation of hippocampal long-term potentiation (LTP), a sustained enhancement of excitatory synaptic strength believed to underlie learning and memory processes. In this review we summarize the evidence pointing to a role for BDNF in generating functional and structural changes at synapses required for both early- and late phases of LTP in the hippocampus. The available information regarding the pre- and/or postsynaptic release of BDNF and action of the neurotrophin during LTP will be also reviewed. Finally, we discuss the effects of BDNF on the synaptic proteome, either by acting on the protein synthesis machinery and/or by regulating protein degradation by calpains and possibly by the ubiquitin-proteasome system (UPS). This fine-tuned control of the synaptic proteome rather than a simple upregulation of the protein synthesis may play a key role in BDNF-mediated synaptic potentiation. This article is part of a Special Issue entitled SI: Brain and Memory.
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Affiliation(s)
- Graciano Leal
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal
| | - Pedro M Afonso
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal; Faculty of Pharmacy, University of Coimbra, 3000-548 Coimbra, Portugal
| | - Ivan L Salazar
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal; PhD Programme in Experimental Biology and Biomedicine (PDBEB) and Institute for Interdisciplinary Research, University of Coimbra (IIIUC), 3030-789 Coimbra, Portugal
| | - Carlos B Duarte
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal; Department of Life Sciences, University of Coimbra, 3004-517 Coimbra, Portugal.
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Neasta J, Barak S, Ben Hamida S, Ron D. mTOR complex 1: a key player in neuroadaptations induced by drugs of abuse. J Neurochem 2014; 130:172-84. [PMID: 24666346 PMCID: PMC4107045 DOI: 10.1111/jnc.12725] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2013] [Revised: 03/19/2014] [Accepted: 03/22/2014] [Indexed: 12/14/2022]
Abstract
The mammalian (or mechanistic) target of rapamycin (mTOR) complex 1 (mTORC1) is a serine and threonine kinase that regulates cell growth, survival, and proliferation. mTORC1 is a master controller of the translation of a subset of mRNAs. In the central nervous system mTORC1 plays a crucial role in mechanisms underlying learning and memory by controlling synaptic protein synthesis. Here, we review recent evidence suggesting that the mTORC1 signaling pathway promotes neuroadaptations following exposure to a diverse group of drugs of abuse including stimulants, cannabinoids, opiates, and alcohol. We further describe potential molecular mechanisms by which drug-induced mTORC1 activation may alter brain functions. Finally, we propose that mTORC1 is a focal point shared by drugs of abuse to mediate drug-related behaviors such as reward seeking and excessive drug intake, and offer future directions to decipher the contribution of the kinase to mechanisms underlying addiction. Recent studies suggesting that exposure to diverse classes of drugs of abuse as well as exposure to drug-associated memories lead to mTORC1 kinase activation in the limbic system. In turn, mTORC1 controls the onset and the maintenance of pathological neuroadaptions that underlie several features of drug addiction such as drug seeking and relapse. Therefore, we propose that targeting mTORC1 and its effectors is a promising strategy to treat drug disorders.
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Affiliation(s)
- Jeremie Neasta
- Department of Neurology, University of California, San Francisco, California, 94143
- The Gallo Research Center, University of California, San Francisco, California, 94143
| | - Segev Barak
- Department of Neurology, University of California, San Francisco, California, 94143
- The Gallo Research Center, University of California, San Francisco, California, 94143
| | - Sami Ben Hamida
- Department of Neurology, University of California, San Francisco, California, 94143
- The Gallo Research Center, University of California, San Francisco, California, 94143
| | - Dorit Ron
- Department of Neurology, University of California, San Francisco, California, 94143
- The Gallo Research Center, University of California, San Francisco, California, 94143
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Gebicke-Haerter PJ. Engram formation in psychiatric disorders. Front Neurosci 2014; 8:118. [PMID: 24904262 PMCID: PMC4036307 DOI: 10.3389/fnins.2014.00118] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Accepted: 05/02/2014] [Indexed: 01/17/2023] Open
Abstract
Environmental factors substantially influence beginning and progression of mental illness, reinforcing or reducing the consequences of genetic vulnerability. Often initiated by early traumatic events, “engrams” or memories are formed that may give rise to a slow and subtle progression of psychiatric disorders. The large delay between beginning and time of onset (diagnosis) may be explained by efficient compensatory mechanisms observed in brain metabolism that use optional pathways in highly redundant molecular interactions. To this end, research has to deal with mechanisms of learning and long-term memory formation, which involves (a) epigenetic changes, (b) altered neuronal activities, and (c) changes in neuron-glia communication. On the epigenetic level, apparently DNA-methylations are more stable than histone modifications, although both closely interact. Neuronal activities basically deliver digital information, which clearly can serve as basis for memory formation (LTP). However, research in this respect has long time neglected the importance of glia. They are more actively involved in the control of neuronal activities than thought before. They can both reinforce and inhibit neuronal activities by transducing neuronal information from frequency-encoded to amplitude and frequency-modulated calcium wave patterns spreading in the glial syncytium by use of gap junctions. In this way, they serve integrative functions. In conclusion, we are dealing with two concepts of encoding information that mutually control each other and synergize: a digital (neuronal) and a wave-like (glial) computing, forming neuron-glia functional units with inbuilt feedback loops to maintain balance of excitation and inhibition. To better understand mental illness, we have to gain more insight into the dynamics of adverse environmental impact on those cellular and molecular systems. This report summarizes existing knowledge and draws some outline about further research in molecular psychiatry.
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Affiliation(s)
- Peter J Gebicke-Haerter
- Medical Faculty Mannheim, Central Institute of Mental Health, Institute of Psychopharmacology, Heidelberg University Mannheim, Germany ; Progrs. de Farmacología y Inmunología, Facultad de Medicina, Universidad de Chile Santiago, Chile
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Takei N, Nawa H. mTOR signaling and its roles in normal and abnormal brain development. Front Mol Neurosci 2014; 7:28. [PMID: 24795562 PMCID: PMC4005960 DOI: 10.3389/fnmol.2014.00028] [Citation(s) in RCA: 218] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Accepted: 03/30/2014] [Indexed: 11/15/2022] Open
Abstract
Target of rapamycin (TOR) was first identified in yeast as a target molecule of rapamycin, an anti-fugal and immunosuppressant macrolide compound. In mammals, its orthologue is called mammalian TOR (mTOR). mTOR is a serine/threonine kinase that converges different extracellular stimuli, such as nutrients and growth factors, and diverges into several biochemical reactions, including translation, autophagy, transcription, and lipid synthesis among others. These biochemical reactions govern cell growth and cause cells to attain an anabolic state. Thus, the disruption of mTOR signaling is implicated in a wide array of diseases such as cancer, diabetes, and obesity. In the central nervous system, the mTOR signaling cascade is activated by nutrients, neurotrophic factors, and neurotransmitters that enhances protein (and possibly lipid) synthesis and suppresses autophagy. These processes contribute to normal neuronal growth by promoting their differentiation, neurite elongation and branching, and synaptic formation during development. Therefore, disruption of mTOR signaling may cause neuronal degeneration and abnormal neural development. While reduced mTOR signaling is associated with neurodegeneration, excess activation of mTOR signaling causes abnormal development of neurons and glia, leading to brain malformation. In this review, we first introduce the current state of molecular knowledge of mTOR complexes and signaling in general. We then describe mTOR activation in neurons, which leads to translational enhancement, and finally discuss the link between mTOR and normal/abnormal neuronal growth during development.
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Affiliation(s)
- Nobuyuki Takei
- Department of Molecular Neurobiology, Brain Research Institute, Niigata University Niigata, Japan
| | - Hiroyuki Nawa
- Department of Molecular Neurobiology, Brain Research Institute, Niigata University Niigata, Japan
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Robinson PA. Understanding the molecular basis of Parkinson’s disease, identification of biomarkers and routes to therapy. Expert Rev Proteomics 2014; 7:565-78. [DOI: 10.1586/epr.10.40] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Bowling HL, Deinhardt K. Proteomic approaches to dissect neuronal signaling pathways. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2014; 806:499-508. [PMID: 24952199 DOI: 10.1007/978-3-319-06068-2_24] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
With an increasing awareness of mental health issues and neurological disorders, "understanding the brain" is one of the biggest current challenges in biological research. This has been recognized by both governments and funding agencies, and includes the need to understand connectivity of brain regions and coordinated network activity, as well as cellular and molecular mechanisms at play. In this chapter, we will describe how we have taken advantage of different proteomic techniques to unravel molecular mechanisms underlying two modulators of neuronal function: Neurotrophins and antipsychotics.
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Affiliation(s)
- Heather L Bowling
- Skirball Institute of Biomolecular Medicine, New York University School of Medicine, New York, NY, 10016, USA,
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Lee Y, Kim J, Jang S, Oh S. Administration of Phytoceramide Enhances Memory and Upregulates the Expression of pCREB and BDNF in Hippocampus of Mice. Biomol Ther (Seoul) 2013; 21:229-33. [PMID: 24265869 PMCID: PMC3830122 DOI: 10.4062/biomolther.2013.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2013] [Revised: 03/19/2013] [Accepted: 03/27/2013] [Indexed: 11/26/2022] Open
Abstract
This study was aimed at investigating the possible effects of phytoceramide (Pcer) on learning and memory and their underlying mechanisms. Phytoceramide was orally administered to ICR mice for 7 days. Memory performances were assessed using the passive avoidance test and Y-maze task. The expressions of phosphorylated cAMP response element binding protein (pCREB), brain-derived neurotrophic factor (BDNF) were measured with immunoblot. The incorporation of 5-bromo-2-deoxyuridine (BrdU) in hippocampal regions was investigated by using immunohistochemical methods. Treatment of Pcer enhanced cognitive performances in the passive avoidance test and Y-maze task. Immunoblotting studies revealed that the phosphorylated CREB and BDNF were significantly increased on hippocampus in the Pcer-treated mice. Immunohistochemical studies showed that the number of immunopositive cells to BrdU was significantly increased in the hippocampal dentate gyrus regions after Pcer-treatment for 7 days. These results suggest that Pcer contribute to enhancing memory and BDNF expression and it could be secondary to the elevation of neurogenesis.
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Affiliation(s)
- Yeonju Lee
- Department of Neuroscience and Tissue Injury Defense Research Center, School of Medicine, Ewha Womans University, Seoul 158-710, Republic of Korea
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Wang YJ, Han DY, Tabib T, Yates JR, Mu TW. Identification of GABA(C) receptor protein homeostasis network components from three tandem mass spectrometry proteomics approaches. J Proteome Res 2013; 12:5570-86. [PMID: 24079818 DOI: 10.1021/pr400535z] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
γ-Amino butyric acid type C (GABA(C)) receptors inhibit neuronal firing primarily in retina. Maintenance of GABA(C) receptor protein homeostasis in cells is essential for its function. However, a systematic study of GABA(C) receptor protein homeostasis (proteostasis) network components is absent. Here coimmunoprecipitation of human GABA(C)-ρ1-receptor complexes was performed in HEK293 cells overexpressing ρ1 receptors. To enhance the coverage and reliability of identified proteins, immunoisolated ρ1-receptor complexes were subjected to three tandem mass spectrometry (MS)-based proteomic analyses, namely, gel-based tandem MS (GeLC-MS/MS), solution-based tandem MS (SoLC-MS/MS), and multidimensional protein identification technology (MudPIT). From the 107 identified proteins, we assembled GABA(C)-ρ1-receptor proteostasis network components, including proteins with protein folding, degradation, and trafficking functions. We studied representative individual ρ1-receptor-interacting proteins, including calnexin, a lectin chaperone that facilitates glycoprotein folding, and LMAN1, a glycoprotein trafficking receptor, and global effectors that regulate protein folding in cells based on bioinformatics analysis, including HSF1, a master regulator of the heat shock response, and XBP1, a key transcription factor of the unfolded protein response. Manipulating selected GABA(C) receptor proteostasis network components is a promising strategy to regulate GABA(C) receptor folding, trafficking, degradation and thus function to ameliorate related retinal diseases.
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Affiliation(s)
- Ya-Juan Wang
- Center for Proteomics and Bioinformatics and Department of Epidemiology and Biostatistics and ‡Department of Physiology and Biophysics, Case Western Reserve University School of Medicine , 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
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Ring RM, Regan CM. Captodiamine, a putative antidepressant, enhances hypothalamic BDNF expression in vivo by synergistic 5-HT2c receptor antagonism and sigma-1 receptor agonism. J Psychopharmacol 2013; 27:930-9. [PMID: 23863923 DOI: 10.1177/0269881113497614] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The putative antidepressant captodiamine is a 5-HT2c receptor antagonist and agonist at sigma-1 and D3 dopamine receptors, exerts an anti-immobility action in the forced swim paradigm, and enhances dopamine turnover in the frontal cortex. Captodiamine has also been found to ameliorate stress-induced anhedonia, reduce the associated elevations of hypothalamic corticotrophin-releasing factor (CRF) and restore the reductions in hypothalamic BDNF expression. Here we demonstrate chronic administration of captodiamine to have no significant effect on hypothalamic CRF expression through sigma-1 receptor agonism; however, both sigma-1 receptor agonism or 5-HT2c receptor antagonism were necessary to enhance BDNF expression. Regulation of BDNF expression by captodiamine was associated with increased phosphorylation of transcription factor CREB and mediated through sigma-1 receptor agonism but blocked by 5-HT2c receptor antagonism. The existence of two separate signalling pathways was confirmed by immunolocalisation of each receptor to distinct cell populations in the paraventricular nucleus of the hypothalamus. Increased BDNF induced by captodiamine was also associated with enhanced expression of synapsin, but not PSD-95, suggesting induction of long-term structural plasticity between hypothalamic synapses. These unique features of captodiamine may contribute to its ability to ameliorate stress-induced anhedonia as the hypothalamus plays a prominent role in regulating HPA axis activity.
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Affiliation(s)
- Rebecca M Ring
- School of Biomolecular and Biomedical Science, University College Dublin, Dublin, Ireland
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Westerholz S, de Lima AD, Voigt T. Thyroid hormone-dependent development of early cortical networks: temporal specificity and the contribution of trkB and mTOR pathways. Front Cell Neurosci 2013; 7:121. [PMID: 23964198 PMCID: PMC3734363 DOI: 10.3389/fncel.2013.00121] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2013] [Accepted: 07/10/2013] [Indexed: 11/17/2022] Open
Abstract
Early in neocortical network development, triiodothyronine (T3) promotes GABAergic neurons' population increase, their somatic growth and the formation of GABAergic synapses. In the presence of T3, GABAergic interneurons form longer axons and conspicuous axonal arborizations, with an increased number of putative synaptic boutons. Here we show that the increased GABAergic axonal growth is positively correlated with the proximity to non-GABAergic neurons (non-GABA). A differential innervation emerges from a T3-dependent decrease of axonal length in fields with low density of neuronal cell bodies, combined with an increased bouton formation in fields with high density of neuronal somata. T3 addition to deprived networks after the first 2 weeks of development did not rescue deficits in the GABAergic synaptic bouton distribution, or in the frequency and duration of spontaneous bursts. During the critical 2-week-period, GABAergic signaling is depolarizing as revealed by calcium imaging experiments. Interestingly, T3 enhanced the expression of the potassium-chloride cotransporter 2 (KCC2), and accelerated the developmental shift from depolarizing to hyperpolarizing GABAergic signaling in non-GABA. The T3-related increase of spontaneous network activity was remarkably reduced after blockade of either tropomyosin-receptor kinase B (trkB) or mammalian target of rapamycin (mTOR) pathways. T3-dependent increase in GABAergic neurons' soma size was mediated mainly by mTOR signaling. Conversely, the T3-dependent selective increase of GABAergic boutons near non-GABAergic cell bodies is mediated by trkB signaling only. Both trkB and mTOR signaling mediate T3-dependent reduction of the GABAergic axon extension. The circuitry context is relevant for the interaction between T3 and trkB signaling, but not for the interactions between T3 and mTOR signaling.
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Affiliation(s)
- Sören Westerholz
- Institute of Physiology, Otto-von-Guericke University Magdeburg, Germany
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