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Arias-Cavieres A, Garcia AJ. A consequence of immature breathing induces persistent changes in hippocampal synaptic plasticity and behavior: a role of prooxidant state and NMDA receptor imbalance. Front Mol Neurosci 2023; 16:1192833. [PMID: 37456523 PMCID: PMC10338931 DOI: 10.3389/fnmol.2023.1192833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Accepted: 05/24/2023] [Indexed: 07/18/2023] Open
Abstract
Underdeveloped breathing results from premature birth and causes intermittent hypoxia during the early neonatal period. Neonatal intermittent hypoxia (nIH) is a condition linked to the increased risk of neurocognitive deficit later in life. However, the mechanistic basis of nIH-induced changes to neurophysiology remains poorly resolved. We investigated the impact of nIH on hippocampal synaptic plasticity and NMDA receptor (NMDAr) expression in neonatal mice. Our findings indicate that nIH induces a prooxidant state that leads to an imbalance in NMDAr subunit composition favoring GluN2B over GluN2A expression and impairs synaptic plasticity. These consequences persist in adulthood and coincide with deficits in spatial memory. Treatment with an antioxidant, manganese (III) tetrakis (1-methyl-4-pyridyl)porphyrin (MnTMPyP), during nIH effectively mitigated both immediate and long-term effects of nIH. However, MnTMPyP treatment post-nIH did not prevent long-lasting changes in either synaptic plasticity or behavior. In addition to demonstrating that the prooxidant state has a central role in nIH-mediated neurophysiological and behavioral deficits, our results also indicate that targeting the prooxidant state during a discrete therapeutic window may provide a potential avenue for mitigating long-term neurophysiological and behavioral outcomes that result from unstable breathing during early postnatal life.
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Affiliation(s)
- Alejandra Arias-Cavieres
- Institute for Integrative Physiology, The University of Chicago, Chicago, IL, United States
- Department of Medicine, Section of Emergency Medicine, The University of Chicago, Chicago, IL, United States
| | - Alfredo J. Garcia
- Institute for Integrative Physiology, The University of Chicago, Chicago, IL, United States
- Department of Medicine, Section of Emergency Medicine, The University of Chicago, Chicago, IL, United States
- University of Chicago Neuroscience Institute, University of Chicago, Chicago, IL, United States
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2
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Yang R, Feng X, Arias-Cavieres A, Mitchell RM, Polo A, Hu K, Zhong R, Qi C, Zhang RS, Westneat N, Portillo CA, Nobrega MA, Hansel C, Garcia Iii AJ, Zhang X. Upregulation of SYNGAP1 expression in mice and human neurons by redirecting alternative splicing. Neuron 2023; 111:1637-1650.e5. [PMID: 36917980 PMCID: PMC10198817 DOI: 10.1016/j.neuron.2023.02.021] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 12/20/2022] [Accepted: 02/13/2023] [Indexed: 03/14/2023]
Abstract
The Ras GTPase-activating protein SYNGAP1 plays a central role in synaptic plasticity, and de novo SYNGAP1 mutations are among the most frequent causes of autism and intellectual disability. How SYNGAP1 is regulated during development and how to treat SYNGAP1-associated haploinsufficiency remain challenging questions. Here, we characterize an alternative 3' splice site (A3SS) of SYNGAP1 that induces nonsense-mediated mRNA decay (A3SS-NMD) in mouse and human neural development. We demonstrate that PTBP1/2 directly bind to and promote SYNGAP1 A3SS inclusion. Genetic deletion of the Syngap1 A3SS in mice upregulates Syngap1 protein and alleviates the long-term potentiation and membrane excitability deficits caused by a Syngap1 knockout allele. We further report a splice-switching oligonucleotide (SSO) that converts SYNGAP1 unproductive isoform to the functional form in human iPSC-derived neurons. This study describes the regulation and function of SYNGAP1 A3SS-NMD, the genetic rescue of heterozygous Syngap1 knockout mice, and the development of an SSO to potentially alleviate SYNGAP1-associated haploinsufficiency.
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Affiliation(s)
- Runwei Yang
- Department of Human Genetics, Neuroscience Institute, The University of Chicago, Chicago, IL 60637, USA
| | - Xinran Feng
- Department of Human Genetics, Neuroscience Institute, The University of Chicago, Chicago, IL 60637, USA
| | - Alejandra Arias-Cavieres
- Section of Emergency Medicine, Department of Medicine, Institute for Integrative Physiology, Neuroscience Institute, The University of Chicago, Chicago, IL 60637, USA
| | - Robin M Mitchell
- Department of Neurobiology, Neuroscience Institute, The University of Chicago, Chicago, IL 60637, USA
| | - Ashleigh Polo
- Section of Emergency Medicine, Department of Medicine, Institute for Integrative Physiology, Neuroscience Institute, The University of Chicago, Chicago, IL 60637, USA
| | - Kaining Hu
- Department of Human Genetics, Neuroscience Institute, The University of Chicago, Chicago, IL 60637, USA
| | - Rong Zhong
- Department of Human Genetics, Neuroscience Institute, The University of Chicago, Chicago, IL 60637, USA
| | - Cai Qi
- Department of Human Genetics, Neuroscience Institute, The University of Chicago, Chicago, IL 60637, USA
| | - Rachel S Zhang
- Department of Human Genetics, Neuroscience Institute, The University of Chicago, Chicago, IL 60637, USA
| | - Nathaniel Westneat
- Department of Human Genetics, Neuroscience Institute, The University of Chicago, Chicago, IL 60637, USA
| | - Cristabel A Portillo
- Department of Neurobiology, Neuroscience Institute, The University of Chicago, Chicago, IL 60637, USA; Department of Anatomy and Neurobiology, University of California Irvine, Irvine, CA 92697, USA
| | - Marcelo A Nobrega
- Department of Human Genetics, the University of Chicago, Chicago, IL 60637, USA
| | - Christian Hansel
- Department of Neurobiology, Neuroscience Institute, The University of Chicago, Chicago, IL 60637, USA
| | - Alfredo J Garcia Iii
- Section of Emergency Medicine, Department of Medicine, Institute for Integrative Physiology, Neuroscience Institute, The University of Chicago, Chicago, IL 60637, USA
| | - Xiaochang Zhang
- Department of Human Genetics, Neuroscience Institute, The University of Chicago, Chicago, IL 60637, USA.
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Arias-Cavieres A, Garcia AJ. A Consequence of Immature Breathing induces Persistent Changes in Hippocampal Synaptic Plasticity and Behavior: A Role of Pro-Oxidant State and NMDA Receptor Imbalance. bioRxiv 2023:2023.03.21.533692. [PMID: 36993632 PMCID: PMC10055328 DOI: 10.1101/2023.03.21.533692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 04/13/2023]
Abstract
Underdeveloped breathing results from premature birth and causes intermittent hypoxia during the early neonatal period. Neonatal intermittent hypoxia (nIH) is a condition linked to the increased risk of neurocognitive deficit later in life. However, the underlying mechanistic consequences nIH-induced neurophysiological changes remains poorly resolved. Here, we investigated the impact of nIH on hippocampal synaptic plasticity and NMDA receptor (NMDAr) expression in neonatal mice. Our findings indicate that nIH induces a pro-oxidant state, leading to an imbalance in NMDAr subunit composition that favors GluN2A over GluN2B expression, and subsequently impairs synaptic plasticity. These consequences persist in adulthood and coincide with deficits in spatial memory. Treatment with the antioxidant, manganese(III) tetrakis(1-methyl-4-pyridyl)porphyrin (MnTMPyP), during nIH effectively mitigated both immediate and long-term effects of nIH. However, MnTMPyP treatment post-nIH did not prevent the long-lasting changes in either synaptic plasticity or behavior. Our results underscore the central role of the pro-oxidant state in nIH-mediated neurophysiological and behavioral deficits and importance of stable oxygen homeostasis during early life. These findings suggest that targeting the pro-oxidant state during a discrete window may provide a potential avenue for mitigating long-term neurophysiological and behavioral outcomes when breathing is unstable during early postnatal life. Highlights Untreated immature breathing leads neonatal intermittent hypoxia (nIH).nIH promotes a pro-oxidant state associated with increased HIF1a activity and NOX upregulation.nIH-dependent pro-oxidant state leads to NMDAr remodeling of the GluN2 subunit to impair synaptic plasticity.Impaired synaptic plasticity and NMDAr remodeling caused by nIH persists beyond the critical period of development.A discrete window for antioxidant administration exists to effectively mitigate neurophysiological and behavioral consequences of nIH.
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Affiliation(s)
- Alejandra Arias-Cavieres
- Institute for Integrative Physiology, The University of Chicago
- Department of Medicine, Section of Emergency Medicine, The University of Chicago
| | - Alfredo J. Garcia
- Institute for Integrative Physiology, The University of Chicago
- Grossman Institute for Neuroscience, Quantitative Biology & Human Behavior, The University of Chicago
- Department of Medicine, Section of Emergency Medicine, The University of Chicago
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Valdés-Undurraga I, Lobos P, Sánchez-Robledo V, Arias-Cavieres A, SanMartín CD, Barrientos G, More J, Muñoz P, Paula-Lima AC, Hidalgo C, Adasme T. Long-term potentiation and spatial memory training stimulate the hippocampal expression of RyR2 calcium release channels. Front Cell Neurosci 2023; 17:1132121. [PMID: 37025696 PMCID: PMC10071512 DOI: 10.3389/fncel.2023.1132121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Accepted: 02/21/2023] [Indexed: 04/08/2023] Open
Abstract
Introduction: Neuronal Ca2+ signals generated through the activation of Ca2+-induced Ca2+ release in response to activity-generated Ca2+ influx play a significant role in hippocampal synaptic plasticity, spatial learning, and memory. We and others have previously reported that diverse stimulation protocols, or different memory-inducing procedures, enhance the expression of endoplasmic reticulum-resident Ca2+ release channels in rat primary hippocampal neuronal cells or hippocampal tissue. Methods and Results: Here, we report that induction of long-term potentiation (LTP) by Theta burst stimulation protocols of the CA3-CA1 hippocampal synapse increased the mRNA and protein levels of type-2 Ryanodine Receptor (RyR2) Ca2+ release channels in rat hippocampal slices. Suppression of RyR channel activity (1 h preincubation with 20 μM ryanodine) abolished both LTP induction and the enhanced expression of these channels; it also promoted an increase in the surface expression of the α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor subunits GluR1 and GluR2 and caused a moderate but significant reduction of dendritic spine density. In addition, training rats in the Morris water maze induced memory consolidation, which lasted for several days after the end of the training period, accompanied by an increase in the mRNA levels and the protein content of the RyR2 channel isoform. Discussion: We confirm in this work that LTP induction by TBS protocols requires functional RyR channels. We propose that the increments in the protein content of RyR2 Ca2+ release channels, induced by LTP or spatial memory training, play a significant role in hippocampal synaptic plasticity and spatial memory consolidation.
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Affiliation(s)
- Ismael Valdés-Undurraga
- Biomedical Research Institute (BNI), Faculty of Medicine, Universidad de Chile, Santiago, Chile
- IVIRMA, Santiago, Chile
| | - Pedro Lobos
- Biomedical Research Institute (BNI), Faculty of Medicine, Universidad de Chile, Santiago, Chile
- Center for Advanced Clinical Investigation (CICA), Clinical Hospital, Universidad de Chile, Santiago, Chile
| | | | - Alejandra Arias-Cavieres
- Section of Emergency Medicine, Department of Medicine, Institute for Integrative Physiology, Neuroscience Institute, The University of Chicago, Chicago, IL, United States
| | - Carol D. SanMartín
- Center for Advanced Clinical Investigation (CICA), Clinical Hospital, Universidad de Chile, Santiago, Chile
| | - Genaro Barrientos
- Physiology and Biophysics Program, ICBM, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Jamileth More
- Center for Advanced Clinical Investigation (CICA), Clinical Hospital, Universidad de Chile, Santiago, Chile
- Laboratory of Translational Psychiatry, Department of Neuroscience and Department de Psychiatry North, Universidad de Chile, Santiago, Chile
| | - Pablo Muñoz
- Translational Neurology Center and Biomedical Research Center, Faculty of Medicine, Universidad de Valparaíso, Valparaíso, Chile
| | - Andrea Cristina Paula-Lima
- Biomedical Research Institute (BNI), Faculty of Medicine, Universidad de Chile, Santiago, Chile
- Institute for Research in Dental Sciences (ICOD), Faculty of Dentistry, Universidad de Chile, Santiago, Chile
- Department of Neuroscience, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Cecilia Hidalgo
- Biomedical Research Institute (BNI), Faculty of Medicine, Universidad de Chile, Santiago, Chile
- Physiology and Biophysics Program, ICBM, Faculty of Medicine, Universidad de Chile, Santiago, Chile
- Department of Neuroscience, Faculty of Medicine, Universidad de Chile, Santiago, Chile
- Center for Exercise, Metabolism and Cancer (CEMC), Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Tatiana Adasme
- Biomedical Research Institute (BNI), Faculty of Medicine, Universidad de Chile, Santiago, Chile
- Section of Emergency Medicine, Department of Medicine, Institute for Integrative Physiology, Neuroscience Institute, The University of Chicago, Chicago, IL, United States
- Laboratory of Translational Psychiatry, Department of Neuroscience and Department de Psychiatry North, Universidad de Chile, Santiago, Chile
- *Correspondence: Tatiana Adasme
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Arias-Cavieres A, Fonteh A, Castro-Rivera CI, Garcia AJ. Intermittent Hypoxia causes targeted disruption to NMDA receptor dependent synaptic plasticity in area CA1 of the hippocampus. Exp Neurol 2021; 344:113808. [PMID: 34256046 DOI: 10.1016/j.expneurol.2021.113808] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 06/21/2021] [Accepted: 07/08/2021] [Indexed: 12/27/2022]
Abstract
Changed NMDA receptor (NMDAr) physiology is implicated with cognitive deficit resulting from conditions ranging from normal aging to neurological disease. Using intermittent hypoxia (IH) to experimentally model untreated sleep apnea, a clinical condition whose comorbidities include neurocognitive impairment, we recently demonstrated that IH causes a pro-oxidant condition that contributes to deficits in spatial memory and in NMDAr-dependent long-term potentiation (LTP). However, the impact of IH on additional forms of synaptic plasticity remains ill-defined. Here we show that IH prevents the induction of NMDAr-dependent LTP and long-term depression (LTD) in hippocampal brain slices from mice exposed to ten days of IH (IH10) yet spares NMDAr-independent forms of synaptic plasticity. Deficits in synaptic plasticity were accompanied by a reduction in hippocampal GluN1 expression. Acute manipulation of redox state using the reducing agent, Dithiothreitol (DTT) stimulated the NMDAr-dependent fEPSP following IH10. However, acute use of either DTT or MnTMPyP did not restore NMDAr-dependent synaptic plasticity after IH10 or prevent the IH-dependent reduction in GluN1, the obligatory subunit of the NMDAr. In contrast, MnTMPyP during IH10 (10-MnTMPyP), prevented the suppressive effects of IH on both NMDAr-dependent synaptic plasticity and GluN1 expression. These findings indicate that while the IH-dependent pro-oxidant state causes reversible oxidative neuromodulation of NMDAr activity, acute manipulation of redox state is ineffective in rescuing two key effects of IH related to the NMDAr within the hippocampus. These IH-dependent changes associated with the NMDAr may be a primary avenue by which IH enhances the vulnerability to impaired learning and memory when sleep apnea is left untreated in normal aging and in disease.
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Affiliation(s)
- Alejandra Arias-Cavieres
- Institute for Integrative Physiology, The University of Chicago, USA; Department of Medicine, Section of Emergency Medicine, The University of Chicago, USA
| | - Ateh Fonteh
- Department of Medicine, Section of Emergency Medicine, The University of Chicago, USA
| | - Carolina I Castro-Rivera
- Institute for Integrative Physiology, The University of Chicago, USA; Grossman Institute for Neuroscience, Quantitative Biology & Human Behavior, The University of Chicago, USA
| | - Alfredo J Garcia
- Institute for Integrative Physiology, The University of Chicago, USA; Grossman Institute for Neuroscience, Quantitative Biology & Human Behavior, The University of Chicago, USA; Department of Medicine, Section of Emergency Medicine, The University of Chicago, USA.
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6
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Khuu MA, Nallamothu T, Castro-Rivera CI, Arias-Cavieres A, Szujewski CC, Garcia Iii AJ. Stage-dependent effects of intermittent hypoxia influence the outcome of hippocampal adult neurogenesis. Sci Rep 2021; 11:6005. [PMID: 33727588 PMCID: PMC7966401 DOI: 10.1038/s41598-021-85357-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 02/25/2021] [Indexed: 12/14/2022] Open
Abstract
Over one billion adults worldwide are estimated to suffer from sleep apnea, a condition with wide-reaching effects on brain health. Sleep apnea causes cognitive decline and is a risk factor for neurodegenerative conditions such as Alzheimer’s disease. Rodents exposed to intermittent hypoxia (IH), a hallmark of sleep apnea, exhibit spatial memory deficits associated with impaired hippocampal neurophysiology and dysregulated adult neurogenesis. We demonstrate that IH creates a pro-oxidant condition that reduces the Tbr2+ neural progenitor pool early in the process, while also suppressing terminal differentiation of adult born neurons during late adult neurogenesis. We further show that IH-dependent cell-autonomous hypoxia inducible factor 1-alpha (HIF1a) signaling is activated in early neuroprogenitors and enhances the generation of adult born neurons upon termination of IH. Our findings indicate that oscillations in oxygen homeostasis, such as those found in sleep apnea, have complex stage-dependent influence over hippocampal adult neurogenesis.
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Affiliation(s)
- Maggie A Khuu
- Institute for Integrative Physiology, Section of Emergency Medicine, The University of Chicago, 5841 S Maryland Ave, Chicago, IL, 60637, USA
| | - Thara Nallamothu
- Institute for Integrative Physiology, Section of Emergency Medicine, The University of Chicago, 5841 S Maryland Ave, Chicago, IL, 60637, USA
| | - Carolina I Castro-Rivera
- Institute for Integrative Physiology, Section of Emergency Medicine, The University of Chicago, 5841 S Maryland Ave, Chicago, IL, 60637, USA.,Committee On Neurobiology, The University of Chicago, Chicago, IL, 60307, USA.,Grossman Institute for Neuroscience, Quantitative Biology and Human Behavior, The University of Chicago, Chicago, IL, 60637, USA
| | - Alejandra Arias-Cavieres
- Institute for Integrative Physiology, Section of Emergency Medicine, The University of Chicago, 5841 S Maryland Ave, Chicago, IL, 60637, USA
| | - Caroline C Szujewski
- Institute for Integrative Physiology, Section of Emergency Medicine, The University of Chicago, 5841 S Maryland Ave, Chicago, IL, 60637, USA.,Committee On Neurobiology, The University of Chicago, Chicago, IL, 60307, USA.,Grossman Institute for Neuroscience, Quantitative Biology and Human Behavior, The University of Chicago, Chicago, IL, 60637, USA
| | - Alfredo J Garcia Iii
- Institute for Integrative Physiology, Section of Emergency Medicine, The University of Chicago, 5841 S Maryland Ave, Chicago, IL, 60637, USA. .,Committee On Neurobiology, The University of Chicago, Chicago, IL, 60307, USA. .,Grossman Institute for Neuroscience, Quantitative Biology and Human Behavior, The University of Chicago, Chicago, IL, 60637, USA.
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Arias-Cavieres A, Nwakudu C, Fonteh A, Garcia AJ. IH‐dependent HIF1a signaling upregulates reactive oxygen species signaling to suppress expression of the hippocampal NMDA receptor by downregulating the NR1 subunit. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.04286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Arias-Cavieres A, More J, Vicente JM, Adasme T, Hidalgo J, Valdés JL, Humeres A, Valdés-Undurraga I, Sánchez G, Hidalgo C, Barrientos G. Triclosan Impairs Hippocampal Synaptic Plasticity and Spatial Memory in Male Rats. Front Mol Neurosci 2018; 11:429. [PMID: 30534053 PMCID: PMC6275195 DOI: 10.3389/fnmol.2018.00429] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Accepted: 11/05/2018] [Indexed: 12/12/2022] Open
Abstract
Triclosan, a widely used industrial and household agent, is present as an antiseptic ingredient in numerous products of everyday use, such as toothpaste, cosmetics, kitchenware, and toys. Previous studies have shown that human brain and animal tissues contain triclosan, which has been found also as a contaminant of water and soil. Triclosan disrupts heart and skeletal muscle Ca2+ signaling, damages liver function, alters gut microbiota, causes colonic inflammation, and promotes apoptosis in cultured neocortical neurons and neural stem cells. Information, however, on the possible effects of triclosan on the function of the hippocampus, a key brain region for spatial learning and memory, is lacking. Here, we report that triclosan addition at low concentrations to hippocampal slices from male rats inhibited long-term potentiation but did not affect basal synaptic transmission or paired-pulse facilitation and modified the content or phosphorylation levels of synaptic plasticity-related proteins. Additionally, incubation of primary hippocampal cultures with triclosan prevented both the dendritic spine remodeling induced by brain-derived neurotrophic factor and the emergence of spontaneous oscillatory Ca2+ signals. Furthermore, intra-hippocampal injection of triclosan significantly disrupted rat navigation in the Oasis maze spatial memory task, an indication that triclosan impairs hippocampus-dependent spatial memory performance. Based on these combined results, we conclude that triclosan exerts highly damaging effects on hippocampal neuronal function in vitro and impairs spatial memory processes in vivo.
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Affiliation(s)
| | - Jamileth More
- Biomedical Neuroscience Institute, Universidad de Chile, Santiago, Chile
| | | | - Tatiana Adasme
- Biomedical Neuroscience Institute, Universidad de Chile, Santiago, Chile
- Centro Integrativo de Biología y Química Aplicada, Universidad Bernardo O’Higgins, Santiago, Chile
| | - Jorge Hidalgo
- Physiology and Biophysics Program, ICBM, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - José Luis Valdés
- Biomedical Neuroscience Institute, Universidad de Chile, Santiago, Chile
- Department of Neuroscience, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Alexis Humeres
- Department of Morphofunction, Faculty of Medicine, Universidad Diego Portales, Santiago, Chile
| | | | - Gina Sánchez
- Biomedical Neuroscience Institute, Universidad de Chile, Santiago, Chile
- Pathophysiology Program, ICBM, Faculty of Medicine, Universidad de Chile, Santiago, Chile
- CEMC, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Cecilia Hidalgo
- Biomedical Neuroscience Institute, Universidad de Chile, Santiago, Chile
- Physiology and Biophysics Program, ICBM, Faculty of Medicine, Universidad de Chile, Santiago, Chile
- Department of Neuroscience, Faculty of Medicine, Universidad de Chile, Santiago, Chile
- CEMC, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Genaro Barrientos
- Physiology and Biophysics Program, ICBM, Faculty of Medicine, Universidad de Chile, Santiago, Chile
- CEMC, Faculty of Medicine, Universidad de Chile, Santiago, Chile
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9
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Arias-Cavieres A, Barrientos GC, Sánchez G, Elgueta C, Muñoz P, Hidalgo C. Ryanodine Receptor-Mediated Calcium Release Has a Key Role in Hippocampal LTD Induction. Front Cell Neurosci 2018; 12:403. [PMID: 30459562 PMCID: PMC6232521 DOI: 10.3389/fncel.2018.00403] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Accepted: 10/18/2018] [Indexed: 01/04/2023] Open
Abstract
The induction of both long-term potentiation (LTP) and long-term depression (LTD) of synaptic transmission entails pre- and postsynaptic Ca2+ signals, which represent transient increments in cytoplasmic free Ca2+ concentration. In diverse synapse types, Ca2+ release from intracellular stores contributes to amplify the Ca2+ signals initially generated by activation of neuronal Ca2+ entry pathways. Here, we used hippocampal slices from young male rats to evaluate whether pharmacological activation or inhibition of Ca2+ release from the endoplasmic reticulum (ER) mediated by ryanodine receptor (RyR) channels modifies LTD induction at Schaffer collateral-CA1 synapses. Pre-incubation of slices with ryanodine (1 μM, 1 h) or caffeine (1 mM, 30 min) to promote RyR-mediated Ca2+ release facilitated LTD induction by low frequency stimulation (LFS), but did not affect the amplitude of synaptic transmission, the profiles of field excitatory postsynaptic potentials (fEPSP) or the paired-pulse (PP) responses. Conversely, treatment with inhibitory ryanodine (20 μM, 1 h) to suppress RyR-mediated Ca2+ release prevented LTD induction, but did not affect baseline synaptic transmission or PP responses. Previous literature reports indicate that LTD induction requires presynaptic CaMKII activity. We found that 1 h after applying the LTD induction protocol, slices displayed a significant increase in CaMKII phosphorylation relative to the levels exhibited by un-stimulated (naïve) slices. In addition, LTD induction (1 h) enhanced the phosphorylation of the presynaptic protein Synapsin I at a CaMKII-dependent phosphorylation site, indicating that LTD induction stimulates presynaptic CaMKII activity. Pre-incubation of slices with 20 μM ryanodine abolished the increased CaMKII and Synapsin I phosphorylation induced by LTD, whereas naïve slices pre-incubated with inhibitory ryanodine displayed similar CaMKII and Synapsin I phosphorylation levels as naïve control slices. We posit that inhibitory ryanodine suppressed LTD-induced presynaptic CaMKII activity, as evidenced by the suppression of Synapsin I phosphorylation induced by LTD. Accordingly, we propose that presynaptic RyR-mediated Ca2+ signals contribute to LTD induction at Schaffer collateral-CA1 synapses.
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Affiliation(s)
- Alejandra Arias-Cavieres
- Biomedical Neuroscience Institute (BNI), Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Genaro C Barrientos
- Physiology and Biophysics Program, Institute of Biomedical Sciences, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Gina Sánchez
- Biomedical Neuroscience Institute (BNI), Faculty of Medicine, Universidad de Chile, Santiago, Chile.,Pathophysiology Program, Institute of Biomedical Sciences, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Claudio Elgueta
- Systemic and Cellular Neurophysiology, Physiology Institute I, Medical Faculty, University of Freiburg, Freiburg, Germany
| | - Pablo Muñoz
- Pathology and Physiology Department, Medical School, Faculty of Medicine, Universidad de Valparaíso, Valparaíso, Chile
| | - Cecilia Hidalgo
- Biomedical Neuroscience Institute (BNI), Faculty of Medicine, Universidad de Chile, Santiago, Chile.,Physiology and Biophysics Program, Institute of Biomedical Sciences, Faculty of Medicine, Universidad de Chile, Santiago, Chile.,Department of Neuroscience and Center of Molecular Studies of the Cell, Faculty of Medicine, Universidad de Chile, Santiago, Chile
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10
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Arias-Cavieres A, Adasme T, Sánchez G, Muñoz P, Hidalgo C. Aging Impairs Hippocampal- Dependent Recognition Memory and LTP and Prevents the Associated RyR Up-regulation. Front Aging Neurosci 2017; 9:111. [PMID: 28484388 PMCID: PMC5402473 DOI: 10.3389/fnagi.2017.00111] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Accepted: 04/06/2017] [Indexed: 11/21/2022] Open
Abstract
Recognition memory comprises recollection judgment and familiarity, two different processes that engage the hippocampus and the perirhinal cortex, respectively. Previous studies have shown that aged rodents display defective recognition memory and alterations in hippocampal synaptic plasticity. We report here that young rats efficiently performed at short-term (5 min) and long-term (24 h) hippocampus-associated object-location tasks and perirhinal cortex-related novel-object recognition tasks. In contrast, aged rats successfully performed the object-location and the novel-object recognition tasks only at short-term. In addition, aged rats displayed defective long-term potentiation (LTP) and enhanced long-term depression (LTD). Successful long-term performance of object-location but not of novel-object recognition tasks increased the protein levels of ryanodine receptor types-2/3 (RyR2/RyR3) and of IP3R1 in young rat hippocampus. Likewise, sustained LTP induction (1 h) significantly increased RyR2, RyR3 and IP3R1 protein levels in hippocampal slices from young rats. In contrast, LTD induction (1 h) did not modify the levels of these three proteins. Naïve (untrained) aged rats displayed higher RyR2/RyR3 hippocampal protein levels but similar IP3R1 protein content relative to young rats; these levels did not change following exposure to either memory recognition task or after LTP or LTD induction. The perirhinal cortex from young or aged rats did not display changes in the protein contents of RyR2, RyR3, and IP3R1 after exposure at long-term (24 h) to the object-location or the novel-object recognition tasks. Naïve aged rats displayed higher RyR2 channel oxidation levels in the hippocampus compared to naïve young rats. The RyR2/RyR3 up-regulation and the increased RyR2 oxidation levels exhibited by aged rat hippocampus are likely to generate anomalous calcium signals, which may contribute to the well-known impairments in hippocampal LTP and spatial memory that take place during aging.
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Affiliation(s)
| | - Tatiana Adasme
- Biomedical Neuroscience Institute, Faculty of Medicine, Universidad de ChileSantiago, Chile.,Centro Integrativo de Biología y Química Aplicada, Universidad Bernardo O'HigginsSantiago, Chile
| | - Gina Sánchez
- Biomedical Neuroscience Institute, Faculty of Medicine, Universidad de ChileSantiago, Chile.,Pathophysiology Program, Institute of Biomedical Sciences, Faculty of Medicine, Universidad de ChileSantiago, Chile
| | - Pablo Muñoz
- Center for Applied Neurological Sciences and Interdisciplinary Center for Innovation in Health, School of Medicine, Universidad de ValparaísoValparaíso, Chile
| | - Cecilia Hidalgo
- Biomedical Neuroscience Institute, Faculty of Medicine, Universidad de ChileSantiago, Chile.,Center of Molecular Studies of the Cell and Physiology and Biophysics Program, Institute of Biomedical Sciences, Faculty of Medicine, Universidad de ChileSantiago, Chile
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Abstract
In this review article, we address how activity-dependent Ca2+ signaling is crucial for hippocampal synaptic/structural plasticity and discuss how changes in neuronal oxidative state affect Ca2+ signaling and synaptic plasticity. We also analyze current evidence indicating that oxidative stress and abnormal Ca2+ signaling contribute to age-related synaptic plasticity deterioration.
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Affiliation(s)
- Cecilia Hidalgo
- Biomedical Neuroscience Institute, Faculty of Medicine, Universidad de Chile, Santiago, Chile; and
- Center of Molecular Studies of the Cell and Physiology and Biophysics Program, ICBM, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Alejandra Arias-Cavieres
- Biomedical Neuroscience Institute, Faculty of Medicine, Universidad de Chile, Santiago, Chile; and
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Arias-Cavieres A, Rozas C, Reyes-Parada M, Barrera N, Pancetti F, Loyola S, Lorca RA, Zeise ML, Morales B. MDMA (“ecstasy”) impairs learning in the Morris Water Maze and reduces hippocampal LTP in young rats. Neurosci Lett 2010; 469:375-9. [DOI: 10.1016/j.neulet.2009.12.031] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2009] [Revised: 12/09/2009] [Accepted: 12/12/2009] [Indexed: 12/13/2022]
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