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Boo KJ, Kim DH, Cho E, Kim DH, Jeon SJ, Shin CY. Neonatal dysregulation of 2-arachidonoylglycerol induces impaired brain function in adult mice. Neuropharmacology 2024; 257:110045. [PMID: 38885736 DOI: 10.1016/j.neuropharm.2024.110045] [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: 03/09/2024] [Revised: 06/03/2024] [Accepted: 06/12/2024] [Indexed: 06/20/2024]
Abstract
The endocannabinoid system (ECS) regulates neurotransmission linked to synaptic plasticity, cognition, and emotion. While it has been demonstrated that dysregulation of the ECS in adulthood is relevant not only to central nervous system (CNS) disorders such as autism spectrum disorder, cognitive dysfunction, and depression but also to brain function, there are few studies on how dysregulation of the ECS in the neonatal period affects the manifestation and pathophysiology of CNS disorders later in life. In this study, DO34, a diacylglycerol lipase alpha (DAGLα) inhibitor affecting endocannabinoid 2-AG production, was injected into C57BL/6N male mice from postnatal day (PND) 7 to PND 10, inducing dysregulation of the ECS in the neonatal period. Subsequently, we examined whether it affects neuronal function in adulthood through electrophysiological and behavioral evaluation. DO34-injected mice showed significantly decreased cognitive functions, attributed to impairment of hippocampal synaptic plasticity. The findings suggest that regulation of ECS activity in the neonatal period may induce enduring effects on adult brain function.
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Affiliation(s)
- Kyung-Jun Boo
- School of Medicine and Center for Neuroscience Research, Konkuk University, Seoul, 05029, Republic of Korea
| | - Dae Hyun Kim
- School of Medicine and Center for Neuroscience Research, Konkuk University, Seoul, 05029, Republic of Korea
| | - Eunbi Cho
- Department of Pharmacology and Department of Advanced Translational Medicine, School of Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul, 05029, Republic of Korea; Institute of Biomedical Sciences & Technology, Konkuk University, Seoul, 05029, Republic of Korea
| | - Dong Hyun Kim
- Department of Pharmacology and Department of Advanced Translational Medicine, School of Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul, 05029, Republic of Korea; Institute of Biomedical Sciences & Technology, Konkuk University, Seoul, 05029, Republic of Korea.
| | - Se Jin Jeon
- Department of Pharmacology, College of Medicine, Hallym University, Chuncheon, Gangwon, 24252, Republic of Korea.
| | - Chan Young Shin
- School of Medicine and Center for Neuroscience Research, Konkuk University, Seoul, 05029, Republic of Korea; Department of Pharmacology and Department of Advanced Translational Medicine, School of Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul, 05029, Republic of Korea; Institute of Biomedical Sciences & Technology, Konkuk University, Seoul, 05029, Republic of Korea.
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2
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Griffith EC, West AE, Greenberg ME. Neuronal enhancers fine-tune adaptive circuit plasticity. Neuron 2024; 112:3043-3057. [PMID: 39208805 DOI: 10.1016/j.neuron.2024.08.002] [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: 05/01/2023] [Revised: 07/22/2024] [Accepted: 08/06/2024] [Indexed: 09/04/2024]
Abstract
Neuronal activity-regulated gene expression plays a crucial role in sculpting neural circuits that underpin adaptive brain function. Transcriptional enhancers are now recognized as key components of gene regulation that orchestrate spatiotemporally precise patterns of gene transcription. We propose that the dynamics of enhancer activation uniquely position these genomic elements to finely tune activity-dependent cellular plasticity. Enhancer specificity and modularity can be exploited to gain selective genetic access to specific cell states, and the precise modulation of target gene expression within restricted cellular contexts enabled by targeted enhancer manipulation allows for fine-grained evaluation of gene function. Mounting evidence also suggests that enduring stimulus-induced changes in enhancer states can modify target gene activation upon restimulation, thereby contributing to a form of cell-wide metaplasticity. We advocate for focused exploration of activity-dependent enhancer function to gain new insight into the mechanisms underlying brain plasticity and cognitive dysfunction.
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Affiliation(s)
- Eric C Griffith
- Department of Neurobiology, Harvard Medical School, Boston, MA, USA
| | - Anne E West
- Department of Neurobiology, Duke University Medical Center, Durham, NC, USA.
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3
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Kim DW, Moon HC, Lee BH, Park HY. Decoding Arc transcription: a live-cell study of stimulation patterns and transcriptional output. Learn Mem 2024; 31:a054024. [PMID: 39260877 PMCID: PMC11407692 DOI: 10.1101/lm.054024.124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2024] [Accepted: 08/05/2024] [Indexed: 09/13/2024]
Abstract
Activity-regulated cytoskeleton-associated protein (Arc) plays a crucial role in synaptic plasticity, a process integral to learning and memory. Arc transcription is induced within a few minutes of stimulation, making it a useful marker for neuronal activity. However, the specific neuronal activity patterns that initiate Arc transcription have remained elusive due to the inability to observe mRNA transcription in live cells in real time. Using a genetically encoded RNA indicator (GERI) mouse model that expresses endogenous Arc mRNA tagged with multiple GFPs, we investigated Arc transcriptional activity in response to various electrical field stimulation patterns. The GERI mouse model was generated by crossing the Arc-PBS knock-in mouse, engineered with binding sites in the 3' untranslated region (UTR) of Arc mRNA, and the transgenic mouse expressing the cognate binding protein fused to GFP. In dissociated hippocampal neurons, we found that the pattern of stimulation significantly affects Arc transcription. Specifically, theta-burst stimulation consisting of high-frequency (100 Hz) bursts delivered at 10 Hz frequency induced the highest rate of Arc transcription. Concurrently, the amplitudes of nuclear calcium transients also reached their peak with 10 Hz burst stimulation, indicating a correlation between calcium concentration and transcription. However, our dual-color single-cell imaging revealed that there were no significant differences in calcium amplitudes between Arc-positive and Arc-negative neurons upon 10 Hz burst stimulation, suggesting the involvement of other factors in the induction of Arc transcription. Our live-cell RNA imaging provides a deeper insight into the complex regulation of transcription by activity patterns and calcium signaling pathways.
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Affiliation(s)
- Dong Wook Kim
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea
| | - Hyungseok C Moon
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea
| | - Byung Hun Lee
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea
| | - Hye Yoon Park
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea
- Institute of Applied Physics, Seoul National University, Seoul 08826, Republic of Korea
- Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota 55455, USA
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4
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Grünewald B, Wickel J, Hahn N, Rahmati V, Rupp H, Chung HY, Haselmann H, Strauss AS, Schmidl L, Hempel N, Grünewald L, Urbach A, Bauer M, Toyka KV, Blaess M, Claus RA, König R, Geis C. Targeted rescue of synaptic plasticity improves cognitive decline in sepsis-associated encephalopathy. Mol Ther 2024; 32:2113-2129. [PMID: 38788710 PMCID: PMC11286813 DOI: 10.1016/j.ymthe.2024.05.001] [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: 09/01/2023] [Revised: 04/02/2024] [Accepted: 05/01/2024] [Indexed: 05/26/2024] Open
Abstract
Sepsis-associated encephalopathy (SAE) is a frequent complication of severe systemic infection resulting in delirium, premature death, and long-term cognitive impairment. We closely mimicked SAE in a murine peritoneal contamination and infection (PCI) model. We found long-lasting synaptic pathology in the hippocampus including defective long-term synaptic plasticity, reduction of mature neuronal dendritic spines, and severely affected excitatory neurotransmission. Genes related to synaptic signaling, including the gene for activity-regulated cytoskeleton-associated protein (Arc/Arg3.1) and members of the transcription-regulatory EGR gene family, were downregulated. At the protein level, ARC expression and mitogen-activated protein kinase signaling in the brain were affected. For targeted rescue we used adeno-associated virus-mediated overexpression of ARC in the hippocampus in vivo. This recovered defective synaptic plasticity and improved memory dysfunction. Using the enriched environment paradigm as a non-invasive rescue intervention, we found improvement of defective long-term potentiation, memory, and anxiety. The beneficial effects of an enriched environment were accompanied by an increase in brain-derived neurotrophic factor (BDNF) and ARC expression in the hippocampus, suggesting that activation of the BDNF-TrkB pathway leads to restoration of the PCI-induced reduction of ARC. Collectively, our findings identify synaptic pathomechanisms underlying SAE and provide a conceptual approach to target SAE-induced synaptic dysfunction with potential therapeutic applications to patients with SAE.
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Affiliation(s)
- Benedikt Grünewald
- Center for Sepsis Control and Care, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany; Section Translational Neuroimmunology, Department of Neurology, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany; Institute of Pathophysiology and Focus Program Translational Neuroscience (FTN), University Medical Center of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany
| | - Jonathan Wickel
- Center for Sepsis Control and Care, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany; Section Translational Neuroimmunology, Department of Neurology, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany
| | - Nina Hahn
- Center for Sepsis Control and Care, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany; Section Translational Neuroimmunology, Department of Neurology, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany
| | - Vahid Rahmati
- Section Translational Neuroimmunology, Department of Neurology, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany
| | - Hanna Rupp
- Center for Sepsis Control and Care, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany; Section Translational Neuroimmunology, Department of Neurology, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany
| | - Ha-Yeun Chung
- Center for Sepsis Control and Care, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany; Section Translational Neuroimmunology, Department of Neurology, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany
| | - Holger Haselmann
- Center for Sepsis Control and Care, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany; Section Translational Neuroimmunology, Department of Neurology, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany
| | - Anja S Strauss
- Section Translational Neuroimmunology, Department of Neurology, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany
| | - Lars Schmidl
- Section Translational Neuroimmunology, Department of Neurology, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany
| | - Nina Hempel
- Section Translational Neuroimmunology, Department of Neurology, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany
| | - Lena Grünewald
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, University Hospital of Frankfurt, 60528 Frankfurt, Germany
| | - Anja Urbach
- Department of Neurology, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany; Jena Center for Healthy Aging, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany; Leibniz Institute on Aging, Aging Research Center Jena, Beutenbergstr. 11, 07745 Jena, Germany
| | - Michael Bauer
- Center for Sepsis Control and Care, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany; Department of Anesthesiology and Intensive Care, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany
| | - Klaus V Toyka
- Department of Neurology, University of Würzburg, 97080 Würzburg, Germany
| | - Markus Blaess
- Center for Sepsis Control and Care, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany; Institute of Precision Medicine, Medical and Life Sciences Faculty, Furtwangen University, 78054 Villingen-Schwenningen, Germany
| | - Ralf A Claus
- Center for Sepsis Control and Care, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany; Department of Anesthesiology and Intensive Care, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany
| | - Rainer König
- Center for Sepsis Control and Care, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany; Department of Anesthesiology and Intensive Care, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany
| | - Christian Geis
- Center for Sepsis Control and Care, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany; Section Translational Neuroimmunology, Department of Neurology, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany; German Center for Mental Health (DZP), Center for Intervention and Research on Adaptive and Maladaptive Brain Circuits Underlying Mental Health (C-I-R-C), Jena-Magdeburg-Halle, Jena, Germany.
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5
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Rahmi U, Goenawan H, Sylviana N, Setiawan I, Putri ST, Andriyani S, Fitriana LA. Exercise induction at expression immediate early gene (c-Fos, ARC, EGR-1) in the hippocampus: a systematic review. Dement Neuropsychol 2024; 18:e20230015. [PMID: 38628561 PMCID: PMC11019719 DOI: 10.1590/1980-5764-dn-2023-0015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 11/06/2023] [Accepted: 11/17/2023] [Indexed: 04/19/2024] Open
Abstract
The immediate early gene exhibits activation markers in the nervous system consisting of ARC, EGR-1, and c-Fos and is related to synaptic plasticity, especially in the hippocampus. Immediate early gene expression is affected by physical exercise, which induces direct ARC, EGR-1, and c-Fos expression. Objective To assess the impact of exercise, we conducted a literature study to determine the expression levels of immediate early genes (ARC, c-Fos, and EGR-1). Methods The databases accessed for online literature included PubMed-Medline, Scopus, and ScienceDirect. The original English articles were selected using the following keywords in the title: (Exercise OR physical activity) AND (c-Fos) AND (Hippocampus), (Exercise OR physical activity) AND (ARC) AND (Hippocampus), (Exercise OR physical activity) AND (EGR-1 OR zif268) AND (Hippocampus). Results Physical exercise can affect the expression of EGR-1, c-Fos, and ARC in the hippocampus, an important part of the brain involved in learning and memory. High-intensity physical exercise can increase c-Fos expression, indicating neural activation. Furthermore, the expression of the ARC gene also increases due to physical exercise. ARC is a gene that plays a role in synaptic plasticity and regulation of learning and memory, changes in synaptic structure and increased synaptic connections, while EGR-1 also plays a role in synaptic plasticity, a genetic change that affects learning and memory. Overall, exercise or regular physical exercise can increase the expression of ARC, c-Fos, and EGR-1 in the hippocampus. This reflects the changes in neuroplasticity and synaptic plasticity that occur in response to physical activity. These changes can improve cognitive function, learning, and memory. Conclusion c-Fos, EGR-1, and ARC expression increases in hippocampal neurons after exercise, enhancing synaptic plasticity and neurogenesis associated with learning and memory.
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Affiliation(s)
- Upik Rahmi
- Universitas Pendidikan Indonesia, Department of Nursing, Bandung, West Java, Indonesia
- Universitas Padjadjaran, Department of Medicine, Bandung, West Java, Indonesia
| | - Hanna Goenawan
- Universitas Padjadjaran, Department of Medicine, Bandung, West Java, Indonesia
| | - Nova Sylviana
- Universitas Padjadjaran, Department of Medicine, Bandung, West Java, Indonesia
| | - Iwan Setiawan
- Universitas Padjadjaran, Department of Medicine, Bandung, West Java, Indonesia
| | - Suci Tuty Putri
- Universitas Pendidikan Indonesia, Department of Nursing, Bandung, West Java, Indonesia
| | - Septian Andriyani
- Universitas Pendidikan Indonesia, Department of Nursing, Bandung, West Java, Indonesia
| | - Lisna Anisa Fitriana
- Universitas Pendidikan Indonesia, Department of Nursing, Bandung, West Java, Indonesia
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Grella SL, Donaldson TN. Contextual memory engrams, and the neuromodulatory influence of the locus coeruleus. Front Mol Neurosci 2024; 17:1342622. [PMID: 38375501 PMCID: PMC10875109 DOI: 10.3389/fnmol.2024.1342622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Accepted: 01/19/2024] [Indexed: 02/21/2024] Open
Abstract
Here, we review the basis of contextual memory at a conceptual and cellular level. We begin with an overview of the philosophical foundations of traversing space, followed by theories covering the material bases of contextual representations in the hippocampus (engrams), exploring functional characteristics of the cells and subfields within. Next, we explore various methodological approaches for investigating contextual memory engrams, emphasizing plasticity mechanisms. This leads us to discuss the role of neuromodulatory inputs in governing these dynamic changes. We then outline a recent hypothesis involving noradrenergic and dopaminergic projections from the locus coeruleus (LC) to different subregions of the hippocampus, in sculpting contextual representations, giving a brief description of the neuroanatomical and physiological properties of the LC. Finally, we examine how activity in the LC influences contextual memory processes through synaptic plasticity mechanisms to alter hippocampal engrams. Overall, we find that phasic activation of the LC plays an important role in promoting new learning and altering mnemonic processes at the behavioral and cellular level through the neuromodulatory influence of NE/DA in the hippocampus. These findings may provide insight into mechanisms of hippocampal remapping and memory updating, memory processes that are potentially dysregulated in certain psychiatric and neurodegenerative disorders.
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Affiliation(s)
- Stephanie L. Grella
- MNEME Lab, Department of Psychology, Program in Neuroscience, Loyola University Chicago, Chicago, IL, United States
| | - Tia N. Donaldson
- Systems Neuroscience and Behavior Lab, Department of Psychology, The University of New Mexico, Albuquerque, NM, United States
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7
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Brancato A, Castelli V, Lavanco G, D'Amico C, Feo S, Pizzolanti G, Kuchar M, Cannizzaro C. Social stress under binge-like alcohol withdrawal in adolescence: evidence of cannabidiol effect on maladaptive plasticity in rats. Psychol Med 2023; 53:5538-5550. [PMID: 36065905 DOI: 10.1017/s0033291722002744] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND Alcohol binge drinking may compromise the functioning of the nucleus accumbens (NAc), i.e. the neural hub for processing reward and aversive responses. METHODS As socially stressful events pose particular challenges at developmental stages, this research applied the resident-intruder paradigm as a model of social stress, to highlight behavioural neuroendocrine and molecular maladaptive plasticity in rats at withdrawal from binge-like alcohol exposure in adolescence. In search of a rescue agent, cannabidiol (CBD) was selected due to its favourable effects on alcohol- and stress-related harms. RESULTS Binge-like alcohol exposed intruder rats displayed a compromised defensive behaviour against the resident and a blunted response of the stress system, in addition to indexes of abnormal dopamine (DA)/glutamate plasticity and dysfunctional spine dynamics in the NAc. CBD administration (60 mg/kg) was able to: (1) increase social exploration in the binge-like alcohol exposed intruder rats, at the expenses of freezing time, and in control rats, which received less aggressive attacks from the resident; (2) reduce corticosterone levels independently on alcohol previous exposure; (3) restore DA transmission and (4) facilitate excitatory postsynaptic strength and remodelling. CONCLUSIONS Overall, the maladaptive behavioural and synaptic plasticity promoted by the intersection between binge-like alcohol withdrawal and exposure to adverse social stress can be rescued by a CBD détente effect that results in a successful defensive strategy, supported by a functional endocrine and synaptic plasticity. The current data highlight CBD's relevant therapeutic potential in alcohol- and stress-related harms, and prompt further investigation on its molecular targets.
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Affiliation(s)
- Anna Brancato
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties 'G. D' Alessandro', University of Palermo, Palermo, Italy
| | - Valentina Castelli
- Department of Biomedicine, Neurosciences and Advanced Diagnostics, University of Palermo, Palermo, Italy
| | - Gianluca Lavanco
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties 'G. D' Alessandro', University of Palermo, Palermo, Italy
| | - Cesare D'Amico
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, University of Palermo, Palermo, Italy
| | - Salvatore Feo
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, University of Palermo, Palermo, Italy
- ATEN Center, Genomic and Proteomic Laboratory, University of Palermo, Palermo, Italy
| | - Giuseppe Pizzolanti
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties 'G. D' Alessandro', University of Palermo, Palermo, Italy
| | - Martin Kuchar
- Department of Chemistry of Natural Compounds, University of Chemistry and Technology, 166 28 Prague, Czech Republic
| | - Carla Cannizzaro
- Department of Biomedicine, Neurosciences and Advanced Diagnostics, University of Palermo, Palermo, Italy
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8
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Damphousse CC, Medeiros JK, Micks NE, Marrone DF. Altered pattern separation in Goto-Kakizaki rats. CURRENT RESEARCH IN NEUROBIOLOGY 2023. [DOI: 10.1016/j.crneur.2023.100082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/19/2023] Open
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9
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Parent MB. Using Postmeal Measures and Manipulations to Investigate Hippocampal Mnemonic Control of Eating Behavior. Neuroscience 2022; 497:228-238. [PMID: 34998891 PMCID: PMC9256844 DOI: 10.1016/j.neuroscience.2021.12.040] [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: 09/12/2021] [Revised: 12/27/2021] [Accepted: 12/30/2021] [Indexed: 10/19/2022]
Abstract
Episodic meal-related memories provide the brain with a powerful mechanism for tracking and controlling eating behavior because they contain a detailed record of recent energy intake that likely outlasts the physiological signals generated by feeding bouts. This review briefly summarizes evidence from human participants showing that episodic meal-related memory limits later eating behavior and then describes our research aimed at investigating whether hippocampal neurons mediate the inhibitory effects of meal-related memory on subsequent feeding. Our approach has been inspired by pioneering work conducted by Ivan Izquierdo and others who used posttraining manipulations to investigate memory consolidation. This review describes the rationale and value of posttraining manipulations, how Izquierdo used them to demonstrate that dorsal hippocampal (dHC) neurons are critical for memory consolidation, and how we have adapted this strategy to investigate whether dHC neurons are necessary for mnemonic control of energy intake. I describe our evidence showing that ingestion activates the molecular processes necessary for synaptic plasticity and memory during the early postprandial period, when the memory of the meal would be undergoing consolidation, and then summarize our findings showing that neural activity in dHC neurons is critical during the early postprandial period for limiting future intake. Collectively, our evidence supports the hypothesis that dHC neurons mediate the inhibitory effects of ingestion-related memory on future intake and demonstrates that post-experience memory modulation is not confined to artificial laboratory memory tasks.
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Affiliation(s)
- M B Parent
- Neuroscience Institute & Department of Psychology, Georgia State University, PO Box 5030, Atlanta, GA 30303, USA.
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10
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Mahringer D, Zmarz P, Okuno H, Bito H, Keller GB. Functional correlates of immediate early gene expression in mouse visual cortex. PEER COMMUNITY JOURNAL 2022; 2:e45. [PMID: 37091727 PMCID: PMC7614465 DOI: 10.24072/pcjournal.156] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 04/25/2023]
Abstract
During visual development, response properties of layer 2/3 neurons in visual cortex are shaped by experience. Both visual and visuomotor experience are necessary to co-ordinate the integration of bottom-up visual input and top-down motor-related input. Whether visual and visuomotor experience engage different plasticity mechanisms, possibly associated with the two separate input pathways, is still unclear. To begin addressing this, we measured the expression level of three different immediate early genes (IEG) (c-fos, egr1 or Arc) and neuronal activity in layer 2/3 neurons of visual cortex before and after a mouse's first visual exposure in life, and subsequent visuomotor learning. We found that expression levels of all three IEGs correlated positively with neuronal activity, but that first visual and first visuomotor exposure resulted in differential changes in IEG expression patterns. In addition, IEG expression levels differed depending on whether neurons exhibited primarily visually driven or motor-related activity. Neurons with strong motor-related activity preferentially expressed EGR1, while neurons that developed strong visually driven activity preferentially expressed Arc. Our findings are consistent with the interpretation that bottom-up visual input and top-down motor-related input are associated with different IEG expression patterns and hence possibly also with different plasticity pathways.
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Affiliation(s)
- David Mahringer
- Faculty of Natural Sciences, University of Basel, Basel, Switzerland
- Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland
| | - Pawel Zmarz
- Faculty of Natural Sciences, University of Basel, Basel, Switzerland
- Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland
| | - Hiroyuki Okuno
- Department of Biochemistry and Molecular Biology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Kagoshima 890-8544, Japan
| | - Haruhiko Bito
- Department of Neurochemistry, Graduate School of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Georg B Keller
- Faculty of Natural Sciences, University of Basel, Basel, Switzerland
- Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland
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11
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Gros A, Lim AWH, Hohendorf V, White N, Eckert M, McHugh TJ, Wang SH. Behavioral and Cellular Tagging in Young and in Early Cognitive Aging. Front Aging Neurosci 2022; 14:809879. [PMID: 35283750 PMCID: PMC8907879 DOI: 10.3389/fnagi.2022.809879] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Accepted: 01/06/2022] [Indexed: 11/17/2022] Open
Abstract
The ability to maintain relevant information on a daily basis is negatively impacted by aging. However, the neuronal mechanism manifesting memory persistence in young animals and memory decline in early aging is not fully understood. A novel event, when introduced around encoding of an everyday memory task, can facilitate memory persistence in young age but not in early aging. Here, we investigated in male rats how sub-regions of the hippocampus are involved in memory representation in behavioral tagging and how early aging affects such representation by combining behavioral training in appetitive delayed-matching-to-place tasks with the “cellular compartment analysis of temporal activity by fluorescence in situ hybridization” technique. We show that neuronal assemblies activated by memory encoding were also partially activated by novelty, particularly in the distal CA1 and proximal CA3 subregions in young male rats. In early aging, both encoding- and novelty-triggered neuronal populations were significantly reduced with a more profound effect in encoding neurons. Thus, memory persistence through novelty facilitation engages overlapping hippocampal assemblies as a key cellular signature, and cognitive aging is associated with underlying reduction in neuronal activation.
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Affiliation(s)
- Alexandra Gros
- Centre for Clinical Brain Sciences, The University of Edinburgh, Edinburgh, United Kingdom
| | - Amos W. H. Lim
- Centre for Clinical Brain Sciences, The University of Edinburgh, Edinburgh, United Kingdom
| | - Victoria Hohendorf
- Centre for Clinical Brain Sciences, The University of Edinburgh, Edinburgh, United Kingdom
| | - Nicole White
- Centre for Clinical Brain Sciences, The University of Edinburgh, Edinburgh, United Kingdom
| | - Michael Eckert
- Canadian Centre for Behavioural Neuroscience, University of Lethbridge, Lethbridge, AB, Canada
| | - Thomas John McHugh
- Laboratory for Circuit and Behavioral Physiology, RIKEN Center for Brain Science, Saitama, Japan
| | - Szu-Han Wang
- Centre for Clinical Brain Sciences, The University of Edinburgh, Edinburgh, United Kingdom
- *Correspondence: Szu-Han Wang,
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12
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Parent MB, Higgs S, Cheke LG, Kanoski SE. Memory and eating: A bidirectional relationship implicated in obesity. Neurosci Biobehav Rev 2022; 132:110-129. [PMID: 34813827 PMCID: PMC8816841 DOI: 10.1016/j.neubiorev.2021.10.051] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 10/17/2021] [Accepted: 10/28/2021] [Indexed: 01/03/2023]
Abstract
This paper reviews evidence demonstrating a bidirectional relationship between memory and eating in humans and rodents. In humans, amnesia is associated with impaired processing of hunger and satiety cues, disrupted memory of recent meals, and overconsumption. In healthy participants, meal-related memory limits subsequent ingestive behavior and obesity is associated with impaired memory and disturbances in the hippocampus. Evidence from rodents suggests that dorsal hippocampal neural activity contributes to the ability of meal-related memory to control future intake, that endocrine and neuropeptide systems act in the ventral hippocampus to provide cues regarding energy status and regulate learned aspects of eating, and that consumption of hypercaloric diets and obesity disrupt these processes. Collectively, this evidence indicates that diet-induced obesity may be caused and/or maintained, at least in part, by a vicious cycle wherein excess intake disrupts hippocampal functioning, which further increases intake. This perspective may advance our understanding of how the brain controls eating, the neural mechanisms that contribute to eating-related disorders, and identify how to treat diet-induced obesity.
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Affiliation(s)
- Marise B Parent
- Neuroscience Institute & Department of Psychology, Georgia State University, Box 5030, Atlanta, GA 30303-5030, United States.
| | - Suzanne Higgs
- School of Psychology, University of Birmingham, Edgbaston, Birmingham, BI5 2TT, United Kingdom.
| | - Lucy G Cheke
- Department of Psychology, University of Cambridge, Downing Street, Cambridge, CB2 3EB, United Kingdom.
| | - Scott E Kanoski
- Department of Biological Sciences, Human and Evolutionary Biology Section, University of Southern California, Los Angeles, CA, 90089-0371, United States.
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13
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DNA repair enzyme NEIL3 enables a stable neural representation of space by shaping transcription in hippocampal neurons. iScience 2021; 24:103470. [PMID: 34988395 PMCID: PMC8710552 DOI: 10.1016/j.isci.2021.103470] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 09/16/2021] [Accepted: 11/15/2021] [Indexed: 11/21/2022] Open
Abstract
DNA repair enzymes are essential for the maintenance of the neuronal genome and thereby proper brain functions. Emerging evidence links DNA repair to epigenetic gene regulation; however, its contribution to different transcriptional programs required for neuronal functions remains elusive. In this study, we identified a role of the DNA repair enzyme NEIL3 in modulating the maturation and function of hippocampal CA1 neurons by shaping the CA1 transcriptome during postnatal development and in association with spatial behavior. We observed a delayed maturation in Neil3-/- CA1 and identified differentially regulated genes required for hippocampal development. We revealed impaired spatial stability in Neil3-/- CA1 place cells and found spatial experience-induced gene expression essential for synaptic plasticity. This is the first study that links molecular underpinnings of DNA repair to the neural basis of spatial cognition beyond animals' behavioral phenotypes, thus shedding light on the molecular determinants enabling a stable neural representation of space. NEIL3 impacts CA1 maturation by shaping transcription during development NEIL3 depletion leads to impaired function of CA1 place cells NEIL3 shapes transcription in hippocampal CA1 during behavior NEIL3 impacts experience-induced expression of immediate early genes (IEGs).
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14
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Binge-like Alcohol Exposure in Adolescence: Behavioural, Neuroendocrine and Molecular Evidence of Abnormal Neuroplasticity… and Return. Biomedicines 2021; 9:biomedicines9091161. [PMID: 34572345 PMCID: PMC8470908 DOI: 10.3390/biomedicines9091161] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2021] [Revised: 08/29/2021] [Accepted: 08/30/2021] [Indexed: 01/02/2023] Open
Abstract
Binge alcohol consumption among adolescents affects the developing neural networks underpinning reward and stress processing in the nucleus accumbens (NAc). This study explores in rats the long-lasting effects of early intermittent exposure to intoxicating alcohol levels at adolescence, on: (1) the response to natural positive stimuli and inescapable stress; (2) stress-axis functionality; and (3) dopaminergic and glutamatergic neuroadaptation in the NAc. We also assess the potential effects of the non-intoxicating phytocannabinoid cannabidiol, to counteract (or reverse) the development of detrimental consequences of binge-like alcohol exposure. Our results show that adolescent binge-like alcohol exposure alters the sensitivity to positive stimuli, exerts social and novelty-triggered anxiety-like behaviour, and passive stress-coping during early and prolonged withdrawal. In addition, serum corticosterone and hypothalamic and NAc corticotropin-releasing hormone levels progressively increase during withdrawal. Besides, NAc tyrosine hydroxylase levels increase at late withdrawal, while the expression of dopamine transporter, D1 and D2 receptors is dynamically altered during binge and withdrawal. Furthermore, the expression of markers of excitatory postsynaptic signaling—PSD95; Homer-1 and -2 and the activity-regulated spine-morphing proteins Arc, LIM Kinase 1 and FOXP1—increase at late withdrawal. Notably, subchronic cannabidiol, during withdrawal, attenuates social- and novelty-induced aversion and passive stress-coping and rectifies the hyper-responsive stress axis and NAc dopamine and glutamate-related neuroplasticity. Overall, the exposure to binge-like alcohol levels in adolescent rats makes the NAc, during withdrawal, a locus minoris resistentiae as a result of perturbations in neuroplasticity and in stress-axis homeostasis. Cannabidiol holds a promising potential for increasing behavioural, neuroendocrine and molecular resilience against binge-like alcohol harmful effects.
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15
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Briggs SB, Hannapel R, Ramesh J, Parent MB. Inhibiting ventral hippocampal NMDA receptors and Arc increases energy intake in male rats. ACTA ACUST UNITED AC 2021; 28:187-194. [PMID: 34011515 PMCID: PMC8139633 DOI: 10.1101/lm.053215.120] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 04/02/2021] [Indexed: 11/24/2022]
Abstract
Research into the neural mechanisms that underlie higher-order cognitive control of eating behavior suggests that ventral hippocampal (vHC) neurons, which are critical for emotional memory, also inhibit energy intake. We showed previously that optogenetically inhibiting vHC glutamatergic neurons during the early postprandial period, when the memory of the meal would be undergoing consolidation, caused rats to eat their next meal sooner and to eat more during that next meal when the neurons were no longer inhibited. The present research determined whether manipulations known to interfere with synaptic plasticity and memory when given pretraining would increase energy intake when given prior to ingestion. Specifically, we tested the effects of blocking vHC glutamatergic N-methyl-D-aspartate receptors (NMDARs) and activity-regulated cytoskeleton-associated protein (Arc) on sucrose ingestion. The results showed that male rats consumed a larger sucrose meal on days when they were given vHC infusions of the NMDAR antagonist APV or Arc antisense oligodeoxynucleotides than on days when they were given control infusions. The rats did not accommodate for that increase by delaying the onset of their next sucrose meal (i.e., decreased satiety ratio) or by eating less during the next meal. These data suggest that vHC NMDARs and Arc limit meal size and inhibit meal initiation.
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Affiliation(s)
- Sherri B Briggs
- Neuroscience Institute, Georgia State University, Atlanta, Georgia 30303, USA
| | - Reilly Hannapel
- Neuroscience Institute, Georgia State University, Atlanta, Georgia 30303, USA
| | - Janavi Ramesh
- Neuroscience Institute, Georgia State University, Atlanta, Georgia 30303, USA
| | - Marise B Parent
- Neuroscience Institute, Georgia State University, Atlanta, Georgia 30303, USA.,Department of Psychology, Georgia State University, Atlanta, Georgia 30303, USA
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16
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Wahlstrom KL, Alvarez-Dieppa AC, McIntyre CK, LaLumiere RT. The medial entorhinal cortex mediates basolateral amygdala effects on spatial memory and downstream activity-regulated cytoskeletal-associated protein expression. Neuropsychopharmacology 2021; 46:1172-1182. [PMID: 33007779 PMCID: PMC8115646 DOI: 10.1038/s41386-020-00875-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 09/08/2020] [Accepted: 09/21/2020] [Indexed: 01/09/2023]
Abstract
The basolateral amygdala (BLA) modulates the consolidation of dorsal hippocampus (DH)-dependent spatial and dorsolateral striatum (DLS)-dependent cued-response memories, often in competition with one another. Evidence suggests that a critical mechanism for BLA influences on memory consolidation is via effects on activity-regulated cytoskeletal-associated protein (ARC) in downstream brain regions. However, the circuitry by which the BLA modulates ARC in multiple competing memory systems remains unclear. Prior evidence indicates that optogenetic stimulation of BLA projections to the medial entorhinal cortex (mEC) enhances the consolidation of spatial learning and impairs the consolidation of cued-response learning, suggesting this pathway provides a circuit for favoring one system over another. Therefore, we hypothesized the BLA-mEC pathway mediates effects on downstream ARC-based synaptic plasticity related to these competing memory systems. To address this, male and female Sprague-Dawley rats underwent spatial or cued-response Barnes maze training and, 45 min later, were sacrificed for ARC analysis in synaptoneurosomes from the DH and DLS. Initial experiments found that spatial training alone increased ARC levels in the DH above those observed in control rats and rats that underwent a cued-response version of the task. Postspatial training optogenetic stimulation of the BLA-mEC pathway altered the balance of ARC expression in the DH vs. DLS, specifically shifting the balance in favor of the DH-based spatial memory system, although the precise region of ARC changes differed by sex. These findings suggest that BLA-mEC pathway influences on ARC in downstream regions are a mechanism by which the BLA can favor one memory system over another.
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Affiliation(s)
- Krista L. Wahlstrom
- grid.214572.70000 0004 1936 8294Department of Psychological and Brain Sciences, University of Iowa, Iowa City, IA 52242 USA
| | - Amanda C. Alvarez-Dieppa
- grid.267323.10000 0001 2151 7939School of Behavioral and Brain Sciences, University of Texas-Dallas, Richardson, TX 75080 USA
| | - Christa K. McIntyre
- grid.267323.10000 0001 2151 7939School of Behavioral and Brain Sciences, University of Texas-Dallas, Richardson, TX 75080 USA
| | - Ryan T. LaLumiere
- grid.214572.70000 0004 1936 8294Department of Psychological and Brain Sciences, University of Iowa, Iowa City, IA 52242 USA ,grid.214572.70000 0004 1936 8294Iowa Neuroscience Institute, University of Iowa, Iowa City, IA 52242 USA
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17
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Eckert P, Marchetta P, Manthey MK, Walter MH, Jovanovic S, Savitska D, Singer W, Jacob MH, Rüttiger L, Schimmang T, Milenkovic I, Pilz PKD, Knipper M. Deletion of BDNF in Pax2 Lineage-Derived Interneuron Precursors in the Hindbrain Hampers the Proportion of Excitation/Inhibition, Learning, and Behavior. Front Mol Neurosci 2021; 14:642679. [PMID: 33841098 PMCID: PMC8033028 DOI: 10.3389/fnmol.2021.642679] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Accepted: 02/26/2021] [Indexed: 12/16/2022] Open
Abstract
Numerous studies indicate that deficits in the proper integration or migration of specific GABAergic precursor cells from the subpallium to the cortex can lead to severe cognitive dysfunctions and neurodevelopmental pathogenesis linked to intellectual disabilities. A different set of GABAergic precursors cells that express Pax2 migrate to hindbrain regions, targeting, for example auditory or somatosensory brainstem regions. We demonstrate that the absence of BDNF in Pax2-lineage descendants of BdnfPax2KOs causes severe cognitive disabilities. In BdnfPax2KOs, a normal number of parvalbumin-positive interneurons (PV-INs) was found in the auditory cortex (AC) and hippocampal regions, which went hand in hand with reduced PV-labeling in neuropil domains and elevated activity-regulated cytoskeleton-associated protein (Arc/Arg3.1; here: Arc) levels in pyramidal neurons in these same regions. This immaturity in the inhibitory/excitatory balance of the AC and hippocampus was accompanied by elevated LTP, reduced (sound-induced) LTP/LTD adjustment, impaired learning, elevated anxiety, and deficits in social behavior, overall representing an autistic-like phenotype. Reduced tonic inhibitory strength and elevated spontaneous firing rates in dorsal cochlear nucleus (DCN) brainstem neurons in otherwise nearly normal hearing BdnfPax2KOs suggests that diminished fine-grained auditory-specific brainstem activity has hampered activity-driven integration of inhibitory networks of the AC in functional (hippocampal) circuits. This leads to an inability to scale hippocampal post-synapses during LTP/LTD plasticity. BDNF in Pax2-lineage descendants in lower brain regions should thus be considered as a novel candidate for contributing to the development of brain disorders, including autism.
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Affiliation(s)
- Philipp Eckert
- Department of Otolaryngology, Head and Neck Surgery, Tübingen Hearing Research Centre, Molecular Physiology of Hearing, University of Tübingen, Tübingen, Germany
| | - Philine Marchetta
- Department of Otolaryngology, Head and Neck Surgery, Tübingen Hearing Research Centre, Molecular Physiology of Hearing, University of Tübingen, Tübingen, Germany
| | - Marie K Manthey
- Department of Otolaryngology, Head and Neck Surgery, Tübingen Hearing Research Centre, Molecular Physiology of Hearing, University of Tübingen, Tübingen, Germany.,Department of Neuroscience, Sackler School of Biomedical Sciences, Tufts University School of Medicine, Boston, MA, United States
| | - Michael H Walter
- Department for Animal Physiology, Institute of Neurobiology, University of Tübingen, Tübingen, Germany
| | - Sasa Jovanovic
- School of Medicine and Health Sciences, Carl von Ossietzky University Oldenburg, Oldenburg, Germany
| | - Daria Savitska
- Department of Otolaryngology, Head and Neck Surgery, Tübingen Hearing Research Centre, Molecular Physiology of Hearing, University of Tübingen, Tübingen, Germany
| | - Wibke Singer
- Department of Otolaryngology, Head and Neck Surgery, Tübingen Hearing Research Centre, Molecular Physiology of Hearing, University of Tübingen, Tübingen, Germany
| | - Michele H Jacob
- Department of Neuroscience, Sackler School of Biomedical Sciences, Tufts University School of Medicine, Boston, MA, United States
| | - Lukas Rüttiger
- Department of Otolaryngology, Head and Neck Surgery, Tübingen Hearing Research Centre, Molecular Physiology of Hearing, University of Tübingen, Tübingen, Germany
| | - Thomas Schimmang
- Instituto de Biología y Genética Molecular, Consejo Superior de Investigaciones Científicas, Universidad de Valladolid, Valladolid, Spain
| | - Ivan Milenkovic
- School of Medicine and Health Sciences, Carl von Ossietzky University Oldenburg, Oldenburg, Germany
| | - Peter K D Pilz
- Department for Animal Physiology, Institute of Neurobiology, University of Tübingen, Tübingen, Germany
| | - Marlies Knipper
- Department of Otolaryngology, Head and Neck Surgery, Tübingen Hearing Research Centre, Molecular Physiology of Hearing, University of Tübingen, Tübingen, Germany
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18
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Hsieh C, Tsokas P, Grau-Perales A, Lesburguères E, Bukai J, Khanna K, Chorny J, Chung A, Jou C, Burghardt NS, Denny CA, Flores-Obando RE, Hartley BR, Rodríguez Valencia LM, Hernández AI, Bergold PJ, Cottrell JE, Alarcon JM, Fenton AA, Sacktor TC. Persistent increases of PKMζ in memory-activated neurons trace LTP maintenance during spatial long-term memory storage. Eur J Neurosci 2021; 54:6795-6814. [PMID: 33540466 DOI: 10.1111/ejn.15137] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Accepted: 01/28/2021] [Indexed: 01/12/2023]
Abstract
PKMζ is an autonomously active PKC isoform crucial for the maintenance of synaptic long-term potentiation (LTP) and long-term memory. Unlike other kinases that are transiently stimulated by second messengers, PKMζ is persistently activated through sustained increases in protein expression of the kinase. Therefore, visualizing increases in PKMζ expression during long-term memory storage might reveal the sites of its persistent action and thus the location of memory-associated LTP maintenance in the brain. Using quantitative immunohistochemistry validated by the lack of staining in PKMζ-null mice, we examined the amount and distribution of PKMζ in subregions of the hippocampal formation of wild-type mice during LTP maintenance and spatial long-term memory storage. During LTP maintenance in hippocampal slices, PKMζ increases in the pyramidal cell body and stimulated dendritic layers of CA1 for at least 2 hr. During spatial memory storage, PKMζ increases in CA1 pyramidal cells for at least 1 month, paralleling the persistence of the memory. During the initial expression of the memory, we tagged principal cells with immediate-early gene Arc promoter-driven transcription of fluorescent proteins. The subset of memory-tagged CA1 cells selectively increases expression of PKMζ during memory storage, and the increase persists in dendritic compartments within stratum radiatum for 1 month, indicating long-term storage of information in the CA3-to-CA1 pathway. We conclude that persistent increases in PKMζ trace the molecular mechanism of LTP maintenance and thus the sites of information storage within brain circuitry during long-term memory.
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Affiliation(s)
- Changchi Hsieh
- Department of Physiology and Pharmacology, The Robert F. Furchgott Center for Neural and Behavioral Science, State University of New York Downstate Health Sciences University, Brooklyn, New York, USA
| | - Panayiotis Tsokas
- Department of Physiology and Pharmacology, The Robert F. Furchgott Center for Neural and Behavioral Science, State University of New York Downstate Health Sciences University, Brooklyn, New York, USA.,Department of Anesthesiology, State University of New York Downstate Health Sciences University, Brooklyn, New York, USA
| | | | | | - Joseph Bukai
- Department of Pathology, The Robert F. Furchgott Center for Neural and Behavioral Science, State University of New York Downstate Health Sciences University, Brooklyn, New York, USA
| | - Kunal Khanna
- Department of Pathology, The Robert F. Furchgott Center for Neural and Behavioral Science, State University of New York Downstate Health Sciences University, Brooklyn, New York, USA
| | - Joelle Chorny
- Department of Pathology, The Robert F. Furchgott Center for Neural and Behavioral Science, State University of New York Downstate Health Sciences University, Brooklyn, New York, USA
| | - Ain Chung
- Center for Neural Science, New York University, New York, New York, USA
| | - Claudia Jou
- Department of Psychology, Hunter College, The City University of New York, New York, NY, USA.,Department of Psychology, The Graduate Center, The City University of New York, New York, NY, USA
| | - Nesha S Burghardt
- Department of Psychology, Hunter College, The City University of New York, New York, NY, USA.,Department of Psychology, The Graduate Center, The City University of New York, New York, NY, USA
| | - Christine A Denny
- Department of Psychiatry, Columbia University Irving Medical Center, Division of Systems Neuroscience, Research Foundation for Mental Hygiene, Inc, New York State Psychiatric Institute Kolb Research Annex, New York, NY, USA
| | - Rafael E Flores-Obando
- Department of Physiology and Pharmacology, The Robert F. Furchgott Center for Neural and Behavioral Science, State University of New York Downstate Health Sciences University, Brooklyn, New York, USA
| | - Benjamin Rush Hartley
- Department of Physiology and Pharmacology, The Robert F. Furchgott Center for Neural and Behavioral Science, State University of New York Downstate Health Sciences University, Brooklyn, New York, USA
| | | | - A Iván Hernández
- Department of Pathology, The Robert F. Furchgott Center for Neural and Behavioral Science, State University of New York Downstate Health Sciences University, Brooklyn, New York, USA
| | - Peter J Bergold
- Department of Physiology and Pharmacology, The Robert F. Furchgott Center for Neural and Behavioral Science, State University of New York Downstate Health Sciences University, Brooklyn, New York, USA.,Department of Neurology, State University of New York Downstate Health Sciences University, Brooklyn, NY, USA
| | - James E Cottrell
- Department of Anesthesiology, State University of New York Downstate Health Sciences University, Brooklyn, New York, USA
| | - Juan Marcos Alarcon
- Department of Pathology, The Robert F. Furchgott Center for Neural and Behavioral Science, State University of New York Downstate Health Sciences University, Brooklyn, New York, USA
| | - André Antonio Fenton
- Department of Physiology and Pharmacology, The Robert F. Furchgott Center for Neural and Behavioral Science, State University of New York Downstate Health Sciences University, Brooklyn, New York, USA.,Center for Neural Science, New York University, New York, New York, USA
| | - Todd Charlton Sacktor
- Department of Physiology and Pharmacology, The Robert F. Furchgott Center for Neural and Behavioral Science, State University of New York Downstate Health Sciences University, Brooklyn, New York, USA.,Department of Anesthesiology, State University of New York Downstate Health Sciences University, Brooklyn, New York, USA.,Department of Neurology, State University of New York Downstate Health Sciences University, Brooklyn, NY, USA
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19
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He Y, Yu Y, Li Y, Duan W, Sun Z, Yang J, Kastin AJ, Pan W, Zhang Y, Wang K. Phenotypic Resemblance to Neuropsychiatric Disorder and Altered mRNA Profiles in Cortex and Hippocampus Underlying IL15Rα Knockout. Front Neurosci 2021; 14:582279. [PMID: 33613171 PMCID: PMC7887313 DOI: 10.3389/fnins.2020.582279] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Accepted: 12/23/2020] [Indexed: 01/05/2023] Open
Abstract
Background Previous studies of the functions of IL15Rα have been limited to immune activities and skeletal muscle development. Immunological factors have been identified as one of the multiple causes of psychosis, and neurological symptoms have been described in IL15Rα knockout (KO) mice. Seeking to explore possible mechanisms for this in the IL15Rα-/- mouse brain, we analyzed gene expression patterns in the cortex and hippocampus using the RNA-seq technique. Methods IL15Rα KO mice were generated and littermate wildtype (WT) mice were used as a control group. A Y-maze was used to assess behavior differences between the two groups. The cortex and hippocampus of 3-month-old male mice were prepared and RNA-seq and transcriptome analysis were performed by gene set enrichment analysis (GSEA). Results Compared with the WT group, IL15Rα KO animals showed higher speed in the novel arm and more entrance frequency in the old arm in the Y-maze experiment. GSEA indicated that 18 pathways were downregulated and 13 pathways upregulated in both cortex and hippocampus from the GO, KEGG, and Hallmark gene sets. The downregulated pathways formed three clusters: respiratory chain and electron transport, regulation of steroid process, and skeletal muscle development. Conclusion IL15Rα KO mice exhibit altered expression of multiple pathways, which could affect many functions of the brain. Lipid biosynthesis and metabolism in the central nervous system (CNS) should be investigated to provide insights into the effect of IL15Rα on psychosis in this murine model.
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Affiliation(s)
- Yi He
- The National Clinical Research Center for Mental Disorders, Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China.,Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - Yuxin Yu
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yanan Li
- Department of Gastrointestinal Surgery, Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, China
| | - Weicheng Duan
- Department of Forensic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Zuoli Sun
- The National Clinical Research Center for Mental Disorders, Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China.,Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - Jian Yang
- The National Clinical Research Center for Mental Disorders, Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China.,Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, China
| | - Abba J Kastin
- Pennington Biomedical Research Center, Baton Rouge, LA, United States
| | - Weihong Pan
- BioPotentials Consult, Sedona, AZ, United States
| | - Yan Zhang
- Department of Clinical Laboratory, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Kang Wang
- Department of Forensic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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20
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Alhaddad H, Alasmari F, Alhamadani B, Wong W, Bell RL, Sari Y. Effects of chronic ethanol consumption on the expression of GLT-1 and neuroplasticity-related proteins in the nucleus accumbens of alcohol-preferring rats. Brain Res Bull 2020; 165:272-280. [PMID: 33075417 DOI: 10.1016/j.brainresbull.2020.10.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 09/25/2020] [Accepted: 10/09/2020] [Indexed: 11/26/2022]
Abstract
Chronic ethanol exposure induces impairments in CNS excitatory and inhibitory activity. These impairments are associated with glutamatergic dysfunction, including altered neuroplasticity. This study examined the effects of 6-week ethanol (15% and 30% v/v) consumption, by male alcohol-preferring P rats, on protein expression associated with neuroplasticity and glutamate transporter-1 (GLT-1) function. The latter regulates intra- and extra-synaptic glutamate levels. We focused on the shell and core subregions of the nucleus accumbens (Acb); i.e., shell (AcbSh) and core (AcbCo), for these measures. Chronic ethanol exposure increased the expression of BDNF, Arc and phosphorylated (p)-post-synaptic density protein-95 (p-PSD-95) in the AcbSh of P rats. Moreover, the ratio of phospho-neuronal nitric oxide synthase (p-nNOS) to total nNOS was also increased in the AcbSh. These changes in BDNF, Arc and p-nNOS/nNOS ratio were not observed in the AcbCo. Furthermore, chronic ethanol consumption reduced GLT-1 expression in the AcbSh. Alternatively, treatment with ceftriaxone (CEF), a known GLT-1 upregulator, abolished the effect of chronic ethanol consumption on BDNF expression in the AcbSh. Overall, the present findings confirm that chronic ethanol consumption modulates activity-associated synaptic proteins, including BDNF, Arc and nNOS in a subregion-specific (i.e., in the AcbSh but not AcbCo) manner. Thus, alterations in mesocorticolimbic glutamatergic homeostasis and neuroplasticity are possible functional targets for the treatment of alcohol use disorders.
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Affiliation(s)
- Hasan Alhaddad
- University of Toledo, College of Pharmacy and Pharmaceutical Sciences, Department of Pharmacology and Experimental Therapeutics, Toledo, OH 43614, USA
| | - Fawaz Alasmari
- University of Toledo, College of Pharmacy and Pharmaceutical Sciences, Department of Pharmacology and Experimental Therapeutics, Toledo, OH 43614, USA; Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Balsam Alhamadani
- University of Toledo, College of Pharmacy and Pharmaceutical Sciences, Department of Pharmacology and Experimental Therapeutics, Toledo, OH 43614, USA
| | - Woonyen Wong
- University of Toledo, College of Pharmacy and Pharmaceutical Sciences, Department of Pharmacology and Experimental Therapeutics, Toledo, OH 43614, USA
| | - Richard L Bell
- Department of Psychiatry and Institute of Psychiatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
| | - Youssef Sari
- University of Toledo, College of Pharmacy and Pharmaceutical Sciences, Department of Pharmacology and Experimental Therapeutics, Toledo, OH 43614, USA.
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21
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Hogan MK, Hamilton GF, Horner PJ. Neural Stimulation and Molecular Mechanisms of Plasticity and Regeneration: A Review. Front Cell Neurosci 2020; 14:271. [PMID: 33173465 PMCID: PMC7591397 DOI: 10.3389/fncel.2020.00271] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 07/31/2020] [Indexed: 12/23/2022] Open
Abstract
Neural stimulation modulates the depolarization of neurons, thereby triggering activity-associated mechanisms of neuronal plasticity. Activity-associated mechanisms in turn play a major role in post-mitotic structure and function of adult neurons. Our understanding of the interactions between neuronal behavior, patterns of neural activity, and the surrounding environment is evolving at a rapid pace. Brain derived neurotrophic factor is a critical mediator of activity-associated plasticity, while multiple immediate early genes mediate plasticity of neurons following bouts of neural activity. New research has uncovered genetic mechanisms that govern the expression of DNA following changes in neural activity patterns, including RNAPII pause-release and activity-associated double stranded breaks. Discovery of novel mechanisms governing activity-associated plasticity of neurons hints at a layered and complex molecular control of neuronal response to depolarization. Importantly, patterns of depolarization in neurons are shown to be important mediators of genetic expression patterns and molecular responses. More research is needed to fully uncover the molecular response of different types of neurons-to-activity patterns; however, known responses might be leveraged to facilitate recovery after neural damage. Physical rehabilitation through passive or active exercise modulates neurotrophic factor expression in the brain and spinal cord and can initiate cortical plasticity commensurate with functional recovery. Rehabilitation likely relies on activity-associated mechanisms; however, it may be limited in its application. Electrical and magnetic stimulation direct specific activity patterns not accessible through passive or active exercise and work synergistically to improve standing, walking, and forelimb use after injury. Here, we review emerging concepts in the molecular mechanisms of activity-derived plasticity in order to highlight opportunities that could add value to therapeutic protocols for promoting recovery of function after trauma, disease, or age-related functional decline.
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Affiliation(s)
- Matthew K Hogan
- Department of Neurosurgery, Center for Neuroregeneration, Houston Methodist Research Institute, Houston Methodist Hospital, Houston, TX, United States
| | - Gillian F Hamilton
- Department of Neurosurgery, Center for Neuroregeneration, Houston Methodist Research Institute, Houston Methodist Hospital, Houston, TX, United States
| | - Philip J Horner
- Department of Neurosurgery, Center for Neuroregeneration, Houston Methodist Research Institute, Houston Methodist Hospital, Houston, TX, United States
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Gheidi A, Damphousse CC, Marrone DF. Experience-dependent persistent Arc expression is reduced in the aged hippocampus. Neurobiol Aging 2020; 95:225-230. [PMID: 32861833 DOI: 10.1016/j.neurobiolaging.2020.07.032] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 07/29/2020] [Accepted: 07/29/2020] [Indexed: 11/18/2022]
Abstract
Aging is typically accompanied by both memory decline and changes in hippocampal function. Lasting memory is thought to also require recapitulation of recent memory traces during subsequent rest-a phenomenon termed memory trace reactivation or replay. Replay becomes less synchronized in the CA1 region of aged animals, and while subtle, this deficit may have profound physiological consequences for driving plasticity. Importantly, spike timing changes during replay may impair the induction of plasticity-regulating gene products, such as activity-regulated cytoskeletal protein (Arc). To test this hypothesis, Arc transcription was assessed both during spatial exploration and subsequent memory-related replay in hippocampal CA1 of young and aged animals. A significant age-related difference was observed in the pattern of pyramidal cells expressing Arc during rest, supporting the hypothesis that altered plasticity-related cascade is a major consequence of the changes in coordinated activity that occur during consolidation in older animals.
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Affiliation(s)
- Ali Gheidi
- Department of Psychology, Wilfrid Laurier University, Waterloo, Ontario, Canada
| | | | - Diano F Marrone
- Department of Psychology, Wilfrid Laurier University, Waterloo, Ontario, Canada.
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23
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León LA, Brandão ML, Cardenas FP, Parra D, Krahe TE, Cruz APM, Landeira-Fernandez J. Distinct patterns of brain Fos expression in Carioca High- and Low-conditioned Freezing Rats. PLoS One 2020; 15:e0236039. [PMID: 32702030 PMCID: PMC7377485 DOI: 10.1371/journal.pone.0236039] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Accepted: 06/28/2020] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND The bidirectional selection of high and low anxiety-like behavior is a valuable tool for understanding the neurocircuits that are responsible for anxiety disorders. Our group developed two breeding lines of rats, known as Carioca High- and Low-conditioned Freezing (CHF and CLF), based on defensive freezing in the contextual fear conditioning paradigm. A random selected line was employed as a control (CTL) comparison group for both CHF and CLF lines of animals. The present study performed Fos immunochemistry to investigate changes in neural activity in different brain structures among CHF and CLF rats when they were exposed to contextual cues that were previously associated with footshock. RESULTS The study indicated that CHF rats expressed high Fos expression in the locus coeruleus, periventricular nucleus of the hypothalamus (PVN), and lateral portion of the septal area and low Fos expression in the medial portion of the septal area, dentate gyrus, and prelimbic cortex (PL) compared to CTL animals. CLF rats exhibited a decrease in Fos expression in the PVN, PL, and basolateral nucleus of the amygdala and increase in the cingulate and perirhinal cortices compared to CTL animals. CONCLUSIONS Both CHF and CLF rats displayed Fos expression changes key regions of the anxiety brain circuitry. The two bidirectional lines exhibit different pattern of neural activation and inhibition with opposing influences on the PVN, the main structure involved in regulating the hypothalamic-pituitary-adrenal neuroendocrine responses observed in anxiety disorders.
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Affiliation(s)
- Laura A. León
- Laboratory of Neuropsychopharmacology, FFCLRP, Behavioral Neuroscience Institute (INeC), São Paulo University, Campus USP, Ribeirão Preto, São Paulo, Brazil
- Department of Psychology, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro, Brazil
- Programa de Psicología, Universidad Sergio Arboleda, Bogotá, Colombia
| | - Marcus L. Brandão
- Laboratory of Neuropsychopharmacology, FFCLRP, Behavioral Neuroscience Institute (INeC), São Paulo University, Campus USP, Ribeirão Preto, São Paulo, Brazil
| | - Fernando P. Cardenas
- Laboratorio de Neurociencia y Comportamiento, Universidad de los Andes, Bogotá, Colombia
| | - Diana Parra
- Laboratorio de Neurociencia y Comportamiento, Universidad de los Andes, Bogotá, Colombia
| | - Thomas E. Krahe
- Department of Psychology, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - J. Landeira-Fernandez
- Department of Psychology, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro, Brazil
- * E-mail:
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24
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Shandilya MCV, Gautam A. The temporal effect of hippocampal Arc in the working memory paradigm during novelty exploration. Brain Res Bull 2020; 158:51-58. [PMID: 32114002 DOI: 10.1016/j.brainresbull.2020.02.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 01/30/2020] [Accepted: 02/25/2020] [Indexed: 10/24/2022]
Abstract
Arc (activity-regulated cytoskeleton-associated protein) is one of the neuronal Immediate Early Genes (IEG), which is involved in the consolidation of memory and is an essential factor in the induction of Long-term Potentiation (LTP), Long-term Depression (LTD) and homeostatic synaptic plasticity. It has also been implicated in the increased familiarization of novel environments during reference memory paradigms. However, the Arc associated temporal effects in a working memory paradigm during novelty exploration are not well studied. Therefore, in the present study, we used spontaneous alternation behavior (SAB) test along with the expression analysis of Arc to study its temporal effects on the working memory paradigms. Using a modified SAB test, we found that the increase in the duration of exposure to a novel environment in the short time-scale (<min) increases the alternations showing that short-term habituation increases the alternation rate. Additionally, during repeated exposure to a novel environment, the alternation rates decrease after shorter inter-session interval. Parallelly, we observed the upregulation of Arc mRNA and protein level 30 min after the SAB test in the cortex and hippocampus of mice, which returns to near-basal level after two hours. The novel experience, associated with the enhanced expression of Arc, helps in the decrease of alternations in subsequent sessions. This change in alternations was absent if the environment was familiar. Further, the role of Arc during these SAB test was confirmed by the inhibition of hippocampal Arc protein through the stereotaxic infusion of Arc antisense oligodeoxynucleotides. We observed that the Arc is involved in the temporal decrease of spontaneous alternations during a series of exposures to a novel environment. Finally, the significance of these results has been discussed in the light of Wagner's Sometimes Opponent Processes model, where we suggest that Arc reduces the ability for short-term habituation during repeated exposures in the working memory paradigm, and the loss of this ability is more prominent when subjected to a novel environment.
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Affiliation(s)
- M C Vishnu Shandilya
- Molecular Neurobiology Lab, Centre for Neural and Cognitive Sciences, University of Hyderabad, Hyderabad, 500046, India
| | - Akash Gautam
- Molecular Neurobiology Lab, Centre for Neural and Cognitive Sciences, University of Hyderabad, Hyderabad, 500046, India.
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25
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Spatial-Memory Formation After Spaced Learning Involves ERKs1/2 Activation Through a Behavioral-Tagging Process. Sci Rep 2020; 10:98. [PMID: 31919427 PMCID: PMC6952433 DOI: 10.1038/s41598-019-57007-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Accepted: 12/20/2019] [Indexed: 12/25/2022] Open
Abstract
The superiority of spaced over massed learning is an established fact in the formation of long-term memories (LTM). Here we addressed the cellular processes and the temporal demands of this phenomenon using a weak spatial object recognition (wSOR) training, which induces short-term memories (STM) but not LTM. We observed SOR-LTM promotion when two identical wSOR training sessions were spaced by an inter-trial interval (ITI) ranging from 15 min to 7 h, consistently with spaced training. The promoting effect was dependent on neural activity, protein synthesis and ERKs1/2 activity in the hippocampus. Based on the “behavioral tagging” hypothesis, which postulates that learning induces a neural tag that requires proteins to induce LTM formation, we propose that retraining will mainly retag the sites initially labeled by the prior training. Thus, when weak, consecutive training sessions are experienced within an appropriate spacing, the intracellular mechanisms triggered by each session would add, thereby reaching the threshold for protein synthesis required for memory consolidation. Our results suggest in addition that ERKs1/2 kinases play a dual role in SOR-LTM formation after spaced learning, both inducing protein synthesis and setting the SOR learning-tag. Overall, our findings bring new light to the mechanisms underlying the promoting effect of spaced trials on LTM formation.
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26
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Rouhani F, Khodarahmi P, Naseh V. NGF, BDNF and Arc mRNA Expression in the Hippocampus of Rats After Administration of Morphine. Neurochem Res 2019; 44:2139-2146. [DOI: 10.1007/s11064-019-02851-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Revised: 07/26/2019] [Accepted: 07/29/2019] [Indexed: 12/21/2022]
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27
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Myrum C, Rossi SL, Perez EJ, Rapp PR. Cortical network dynamics are coupled with cognitive aging in rats. Hippocampus 2019; 29:1165-1177. [PMID: 31334577 DOI: 10.1002/hipo.23130] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 05/23/2019] [Accepted: 06/05/2019] [Indexed: 12/27/2022]
Abstract
Changes in neuronal network activity and increased interindividual variability in memory are among the most consistent features of growing older. Here, we examined the relationship between these hallmarks of aging. Young and aged rats were trained on a water maze task where aged individuals reliably display an increased range of spatial memory capacities relative to young. Two weeks later, neuronal activity was induced pharmacologically with a low dose of pilocarpine and control animals received vehicle. Activity levels were proxied by quantifying the immediate early gene products Arc and c-Fos. While no relationship was observed between basal, resting activity, and individual differences in spatial memory in any brain region, pilocarpine-induced marker expression was tightly coupled with memory in all areas of the prefrontal cortex (PFC) and hippocampus examined. The nature of this association, however, differed across regions and in relation to age-related cognitive outcome. Specifically, in the medial PFC, induced activity was greatest in aged rats with cognitive impairment and correlated with water maze performance across all subjects. In the hippocampus, the range of induced marker expression was comparable between groups and similarly coupled with memory in both impaired and unimpaired aged rats. Together the findings highlight that the dynamic range of neural network activity across multiple brain regions is a critical component of neurocognitive aging.
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Affiliation(s)
- Craig Myrum
- Laboratory of Behavioral Neuroscience, Neurocognitive Aging Section, National Institute on Aging, Baltimore, Maryland
| | - Sharyn L Rossi
- Laboratory of Behavioral Neuroscience, Neurocognitive Aging Section, National Institute on Aging, Baltimore, Maryland
| | - Evelyn J Perez
- Laboratory of Behavioral Neuroscience, Neurocognitive Aging Section, National Institute on Aging, Baltimore, Maryland
| | - Peter R Rapp
- Laboratory of Behavioral Neuroscience, Neurocognitive Aging Section, National Institute on Aging, Baltimore, Maryland
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28
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Luo L, Callaway EM, Svoboda K. Genetic Dissection of Neural Circuits: A Decade of Progress. Neuron 2019; 98:256-281. [PMID: 29673479 DOI: 10.1016/j.neuron.2018.03.040] [Citation(s) in RCA: 231] [Impact Index Per Article: 46.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 03/16/2018] [Accepted: 03/21/2018] [Indexed: 01/24/2023]
Abstract
Tremendous progress has been made since Neuron published our Primer on genetic dissection of neural circuits 10 years ago. Since then, cell-type-specific anatomical, neurophysiological, and perturbation studies have been carried out in a multitude of invertebrate and vertebrate organisms, linking neurons and circuits to behavioral functions. New methods allow systematic classification of cell types and provide genetic access to diverse neuronal types for studies of connectivity and neural coding during behavior. Here we evaluate key advances over the past decade and discuss future directions.
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Affiliation(s)
- Liqun Luo
- Department of Biology, Howard Hughes Medical Institute, Stanford University, Stanford, CA 94305, USA
| | - Edward M Callaway
- Systems Neurobiology Laboratory, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.
| | - Karel Svoboda
- Howard Hughes Medical Institute, Janelia Research Campus, Ashburn, VA 20147, USA
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29
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Ross A, Barnett N, Faulkner A, Hannapel R, Parent MB. Sucrose ingestion induces glutamate AMPA receptor phosphorylation in dorsal hippocampal neurons: Increased sucrose experience prevents this effect. Behav Brain Res 2019; 359:792-798. [PMID: 30076854 PMCID: PMC6594687 DOI: 10.1016/j.bbr.2018.07.031] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Revised: 07/19/2018] [Accepted: 07/31/2018] [Indexed: 11/26/2022]
Abstract
Evidence suggests that meal-related memory influences later eating behavior. Memory can serve as a powerful mechanism for controlling eating behavior because it provides a record of recent intake that likely outlasts most physiological signals generated by ingestion. Dorsal (dHC) and ventral hippocampal (vHC) neurons are critical for memory, and we demonstrated previously that they limit energy intake during the postprandial period. If dHC or vHC neurons control intake through a process that requires memory, then ingestion should increase events necessary for synaptic plasticity in dHC and vHC during the postprandial period. To test this, we determined whether ingesting a sucrose solution induced posttranslational events critical for hippocampal synaptic plasticity: phosphorylation of AMPAR GluA1 subunits at 1) serine 831 (pSer831) and 2) serine 845 (pSer845). We also examined whether increasing the amount of previous experience with the sucrose solution, which would be expected to decrease the mnemonic demand involved in an ingestion bout, would also attenuate sucrose-induced phosphorylation. Quantitative immunoblotting of dHC and vHC membrane fractions demonstrated that sucrose ingestion increased postprandial pSer831 in dHC but not vHC. Increased previous sucrose experience prevented sucrose-induced dHC pSer831. Sucrose ingestion did not affect pSer845 in either dHC or vHC. Thus, the present findings show that ingestion activates a postranslational event necessary for synaptic plasticity in an experience-dependent manner, which is consistent with the hypothesis that dHC neurons form a memory of a meal during the postprandial period.
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Affiliation(s)
- Amy Ross
- Neuroscience Institute, Georgia State University, P.O. Box 5030, Atlanta, GA, 30302, United States
| | - Nicolette Barnett
- Neuroscience Institute, Georgia State University, P.O. Box 5030, Atlanta, GA, 30302, United States
| | - Alexa Faulkner
- Neuroscience Institute, Georgia State University, P.O. Box 5030, Atlanta, GA, 30302, United States
| | - Reilly Hannapel
- Neuroscience Institute, Georgia State University, P.O. Box 5030, Atlanta, GA, 30302, United States
| | - Marise B Parent
- Neuroscience Institute, Georgia State University, P.O. Box 5030, Atlanta, GA, 30302, United States; Department of Psychology, Georgia State University, P.O. Box 5030, Atlanta, GA, 30302, United States.
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30
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Epstein I, Finkbeiner S. The Arc of cognition: Signaling cascades regulating Arc and implications for cognitive function and disease. Semin Cell Dev Biol 2018; 77:63-72. [PMID: 29559111 DOI: 10.1016/j.semcdb.2017.09.023] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 09/13/2017] [Accepted: 09/14/2017] [Indexed: 12/14/2022]
Abstract
The activity-regulated cytoskeletal (Arc) gene is implicated in numerous synaptic plasticity paradigms, including long-term potentiation and depression and homeostatic plasticity, and is critical for consolidating memory. How Arc facilitates these forms of plasticity is not fully understood. Unlike other neuronal immediate-early genes, Arc encodes a protein that shuttles between the somatodendritic and nuclear compartments to regulate synaptic plasticity. Little attention has been paid to Arc's role in the nucleus. Here, we highlight the regulatory elements and signaling cascades required to induce Arc transcription and discuss the significance of Arc nuclear localization for synaptic plasticity and scaling. We integrate these findings into the context of cognitive function and disease and propose a model in which Arc mediates an effect on memory as a "chaser" of synaptic activity through homeostatic scaling.
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Affiliation(s)
- Irina Epstein
- Gladstone Institutes,1650 Owens Street, San Francisco, CA 94158, USA.
| | - Steven Finkbeiner
- Gladstone Institutes,1650 Owens Street, San Francisco, CA 94158, USA; Departments of Neurology and Physiology, University of California, San Francisco, CA 94158, USA.
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31
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Witharana WKL, Clark BJ, Trivedi V, Mesina L, McNaughton BL. Immediate‐early gene
Homer1a
intranuclear transcription focus intensity as a measure of relative neural activation. Hippocampus 2018; 29:481-490. [DOI: 10.1002/hipo.23036] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 09/17/2018] [Accepted: 09/19/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Wing K. L. Witharana
- Canadian Centre for Behavioural Neuroscience University of Lethbridge Lethbridge Alberta Canada
| | - Benjamin J. Clark
- Canadian Centre for Behavioural Neuroscience University of Lethbridge Lethbridge Alberta Canada
- Department of Psychology University of New Mexico Albuquerque New Mexico
| | - Vivek Trivedi
- Canadian Centre for Behavioural Neuroscience University of Lethbridge Lethbridge Alberta Canada
| | - Lilia Mesina
- Canadian Centre for Behavioural Neuroscience University of Lethbridge Lethbridge Alberta Canada
| | - Bruce L. McNaughton
- Canadian Centre for Behavioural Neuroscience University of Lethbridge Lethbridge Alberta Canada
- Department of Neurobiology and Behavior University of California at Irvine, Center for the Neurobiology of Learning and Memory Irvine California
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32
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Arc/Arg3.1 mediates a critical period for spatial learning and hippocampal networks. Proc Natl Acad Sci U S A 2018; 115:12531-12536. [PMID: 30442670 DOI: 10.1073/pnas.1810125115] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
During early postnatal development, sensory regions of the brain undergo periods of heightened plasticity which sculpt neural networks and lay the foundation for adult sensory perception. Such critical periods were also postulated for learning and memory but remain elusive and poorly understood. Here, we present evidence that the activity-regulated and memory-linked gene Arc/Arg3.1 is transiently up-regulated in the hippocampus during the first postnatal month. Conditional removal of Arc/Arg3.1 during this period permanently alters hippocampal oscillations and diminishes spatial learning capacity throughout adulthood. In contrast, post developmental removal of Arc/Arg3.1 leaves learning and network activity patterns intact. Long-term memory storage continues to rely on Arc/Arg3.1 expression throughout life. These results demonstrate that Arc/Arg3.1 mediates a critical period for spatial learning, during which Arc/Arg3.1 fosters maturation of hippocampal network activity necessary for future learning and memory storage.
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Chawla MK, Gray DT, Nguyen C, Dhaliwal H, Zempare M, Okuno H, Huentelman MJ, Barnes CA. Seizure-Induced Arc mRNA Expression Thresholds in Rat Hippocampus and Perirhinal Cortex. Front Syst Neurosci 2018; 12:53. [PMID: 30443206 PMCID: PMC6221912 DOI: 10.3389/fnsys.2018.00053] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Accepted: 10/05/2018] [Indexed: 01/07/2023] Open
Abstract
Immediate-early genes (IEGs) are rapidly and transiently induced following excitatory neuronal activity including maximal electroconvulsive shock treatment (ECT). The rapid RNA response can be blocked by the sodium channel antagonist tetrodotoxin (TTX), without blocking seizures, indicating a role for electrical stimulation in electroconvulsive shock-induced mRNA responses. In behaving animals, Arc mRNA is selectively transcribed following patterned neuronal activity and rapidly trafficked to dendrites where it preferentially accumulates at active synapses for local translation. Here we examined whether there is a relationship between the current intensities that elicit seizures and the threshold for Arc mRNA transcription in the rat hippocampus and perirhinal cortex (PRC). Animals received ECT of varying current intensities (0, 20, 40 65, 77 and 85 mA) and were sacrificed 5 min later. While significantly more CA1, CA3 and perirhinal pyramidal cells expressed Arc at the lowest stimulus intensity compared to granule cells, there was an abrupt threshold transition that occurred in all four regions at 77 mA. This precise threshold for Arc expression in all temporal lobe neurons examined may involve regulation of the calcium-dependent mechanisms that are upstream to activity-dependent IEG transcription.
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Affiliation(s)
- Monica K. Chawla
- Evelyn F. McKnight Brain Institute, University of Arizona, Tucson, AZ, United States
- ARL Division of Neural Systems, Memory and Aging, University of Arizona, Tucson, AZ, United States
| | - Daniel T. Gray
- Evelyn F. McKnight Brain Institute, University of Arizona, Tucson, AZ, United States
- ARL Division of Neural Systems, Memory and Aging, University of Arizona, Tucson, AZ, United States
| | - Christie Nguyen
- Evelyn F. McKnight Brain Institute, University of Arizona, Tucson, AZ, United States
- ARL Division of Neural Systems, Memory and Aging, University of Arizona, Tucson, AZ, United States
| | - Harshaan Dhaliwal
- Evelyn F. McKnight Brain Institute, University of Arizona, Tucson, AZ, United States
- ARL Division of Neural Systems, Memory and Aging, University of Arizona, Tucson, AZ, United States
| | - Marc Zempare
- Evelyn F. McKnight Brain Institute, University of Arizona, Tucson, AZ, United States
- ARL Division of Neural Systems, Memory and Aging, University of Arizona, Tucson, AZ, United States
| | - Hiroyuki Okuno
- Medical Innovation Center, Kyoto Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Matthew J. Huentelman
- Evelyn F. McKnight Brain Institute, University of Arizona, Tucson, AZ, United States
- Translational Genomics Research Institute, Neurogenomics Division, Phoenix, AZ, United States
| | - Carol A. Barnes
- Evelyn F. McKnight Brain Institute, University of Arizona, Tucson, AZ, United States
- ARL Division of Neural Systems, Memory and Aging, University of Arizona, Tucson, AZ, United States
- Departments of Psychology, Neurology, and Neuroscience, University of Arizona, Tucson, AZ, United States
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Haque MN, Moon IS. Stigmasterol upregulates immediate early genes and promotes neuronal cytoarchitecture in primary hippocampal neurons as revealed by transcriptome analysis. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2018; 46:164-175. [PMID: 30097115 DOI: 10.1016/j.phymed.2018.04.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Revised: 02/21/2018] [Accepted: 04/04/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND The hippocampus is a vulnerable brain region that is implicated in learning and memory impairment by two pathophysiological features, that is, neurite regression and synaptic dysfunction, and stigmasterol (ST), a cholesterol-equivalent phytosterol, is known to facilitate neuromodulatory effects. PURPOSE To investigate the neuromodulatory effects of ST on the development of central nervous system neurons and the molecular bases of these effects in primary hippocampal neurons. METHODS Rat embryonic (E18-19) brain neurons were cultured in the absence or presence of ST (75 µM). Neuritogenic activities of ST were evident by increases in various morphometric parameters. To identify underlying affected genes, total RNA was isolated on day in vitro 12 (DIV 12) and mRNA high throughput sequencing (mRNA-Seq) was performed. Affected key genes for neuronal development were identified using bioinformatics tools and their upregulations were confirmed by immunocytochemistry. RESULTS Among the differentially expressed 17,337 RefSeq genes, 445 genes (up/down 293/157) passed the p-value < 0.05 criterion, 52 genes (up/down; 37/13) had a p-value < 0.05 and a false discovery rate (FDR) q-value of < 0.2, and 24 genes (up/down; 20/4) passed the more stringent criterion of both p < 0.05 and q < 0.05. After applying a stringent FDR q-value cutoff of < 0.2, it was found ST induced many immediate early genes (IEGs), and that a major proportion of upregulated genes were related to central nervous system (CNS) development (neurite outgrowth or synaptic transmission). In a Venn diagram for CNS development Gene Ontologies (GOs) (i.e., axon development, dendrite development, modulation of synaptic transmission), Reln emerged as a central player in these processes, and highly interconnected 'hub' genes, including Dcx, Egr1, Ntrk2, and Slc24a2, were revealed by gene co-expression networks. Finally, transcriptomic data was confirmed by immunocytochemistry of primary hippocampal neurons. CONCLUSION The study indicates that ST upregulates genes for neuritogenesis and synaptogenesis, and suggests ST be viewed as a potential resource for improving brain functions.
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Affiliation(s)
- Md Nazmul Haque
- Department of Anatomy, Dongguk University Graduate School of Medicine, Gyeongju 38066, Republic of Korea
| | - Il Soo Moon
- Department of Anatomy, Dongguk University Graduate School of Medicine, Gyeongju 38066, Republic of Korea.
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35
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Hernandez AR, Reasor JE, Truckenbrod LM, Campos KT, Federico QP, Fertal KE, Lubke KN, Johnson SA, Clark BJ, Maurer AP, Burke SN. Dissociable effects of advanced age on prefrontal cortical and medial temporal lobe ensemble activity. Neurobiol Aging 2018; 70:217-232. [PMID: 30031931 PMCID: PMC6829909 DOI: 10.1016/j.neurobiolaging.2018.06.028] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Revised: 06/20/2018] [Accepted: 06/21/2018] [Indexed: 11/25/2022]
Abstract
The link between age-related cellular changes within brain regions and larger scale neuronal ensemble dynamics critical for cognition has not been fully elucidated. The present study measured neuron activity within medial prefrontal cortex (PFC), perirhinal cortex (PER), and hippocampal subregion CA1 of young and aged rats by labeling expression of the immediate-early gene Arc. The proportion of cells expressing Arc was quantified at baseline and after a behavior that requires these regions. In addition, PER and CA1 projection neurons to PFC were identified with retrograde labeling. Within CA1, no age-related differences in neuronal activity were observed in the entire neuron population or within CA1 pyramidal cells that project to PFC. Although behavior was comparable across age groups, behaviorally driven Arc expression was higher in the deep layers of both PER and PFC and lower in the superficial layers of these regions. Moreover, age-related changes in activity levels were most evident within PER cells that project to PFC. These data suggest that the PER-PFC circuit is particularly vulnerable in advanced age.
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Affiliation(s)
- Abbi R Hernandez
- McKnight Brain Institute, Department of Neuroscience, University of Florida, Gainesville, FL
| | - Jordan E Reasor
- McKnight Brain Institute, Department of Neuroscience, University of Florida, Gainesville, FL
| | - Leah M Truckenbrod
- McKnight Brain Institute, Department of Neuroscience, University of Florida, Gainesville, FL
| | - Keila T Campos
- McKnight Brain Institute, Department of Neuroscience, University of Florida, Gainesville, FL
| | - Quinten P Federico
- McKnight Brain Institute, Department of Neuroscience, University of Florida, Gainesville, FL
| | - Kaeli E Fertal
- McKnight Brain Institute, Department of Neuroscience, University of Florida, Gainesville, FL
| | - Katelyn N Lubke
- McKnight Brain Institute, Department of Neuroscience, University of Florida, Gainesville, FL
| | - Sarah A Johnson
- McKnight Brain Institute, Department of Neuroscience, University of Florida, Gainesville, FL
| | - Benjamin J Clark
- Department of Psychology, University of New Mexico, Albuquerque, New Mexico
| | - Andrew P Maurer
- McKnight Brain Institute, Department of Neuroscience, University of Florida, Gainesville, FL; Department of Biomedical Engineering, University of Florida, Gainesville, FL
| | - Sara N Burke
- McKnight Brain Institute, Department of Neuroscience, University of Florida, Gainesville, FL; Institute on Aging, University of Florida, Gainesville, FL.
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Gallo FT, Katche C, Morici JF, Medina JH, Weisstaub NV. Immediate Early Genes, Memory and Psychiatric Disorders: Focus on c-Fos, Egr1 and Arc. Front Behav Neurosci 2018; 12:79. [PMID: 29755331 PMCID: PMC5932360 DOI: 10.3389/fnbeh.2018.00079] [Citation(s) in RCA: 214] [Impact Index Per Article: 35.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Accepted: 04/10/2018] [Indexed: 01/08/2023] Open
Abstract
Many psychiatric disorders, despite their specific characteristics, share deficits in the cognitive domain including executive functions, emotional control and memory. However, memory deficits have been in many cases undervalued compared with other characteristics. The expression of Immediate Early Genes (IEGs) such as, c-fos, Egr1 and arc are selectively and promptly upregulated in learning and memory among neuronal subpopulations in regions associated with these processes. Changes in expression in these genes have been observed in recognition, working and fear related memories across the brain. Despite the enormous amount of data supporting changes in their expression during learning and memory and the importance of those cognitive processes in psychiatric conditions, there are very few studies analyzing the direct implication of the IEGs in mental illnesses. In this review, we discuss the role of some of the most relevant IEGs in relation with memory processes affected in psychiatric conditions.
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Affiliation(s)
- Francisco T Gallo
- Instituto de Fisiología y Biofísica Bernardo Houssay, Departamento de Fisiología, Facultad de Medicina, Universidad de Buenos Aires (UBA), Buenos Aires, Argentina
| | - Cynthia Katche
- Instituto de Biología Celular y Neurociencias (IBCN) Dr. Eduardo de Robertis, Facultad de Medicina, CONICET, Universidad de Buenos Aires (UBA), Buenos Aires, Argentina
| | - Juan F Morici
- Instituto de Fisiología y Biofísica Bernardo Houssay, Departamento de Fisiología, Facultad de Medicina, Universidad de Buenos Aires (UBA), Buenos Aires, Argentina
| | - Jorge H Medina
- Instituto de Biología Celular y Neurociencias (IBCN) Dr. Eduardo de Robertis, Facultad de Medicina, CONICET, Universidad de Buenos Aires (UBA), Buenos Aires, Argentina.,Departamento de Fisiología, Facultad de Medicina, Universidad de Buenos (UBA), Buenos Aires, Argentina
| | - Noelia V Weisstaub
- Instituto de Fisiología y Biofísica Bernardo Houssay, Departamento de Fisiología, Facultad de Medicina, Universidad de Buenos Aires (UBA), Buenos Aires, Argentina
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Chawla MK, Sutherland VL, Olson K, McNaughton BL, Barnes CA. Behavior-driven arc expression is reduced in all ventral hippocampal subfields compared to CA1, CA3, and dentate gyrus in rat dorsal hippocampus. Hippocampus 2018; 28:178-185. [PMID: 29232477 DOI: 10.1002/hipo.22820] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 11/21/2017] [Accepted: 12/06/2017] [Indexed: 11/10/2022]
Abstract
Anatomical connectivity and lesion studies reveal distinct functional heterogeneity along the dorsal-ventral axis of the hippocampus. The immediate early gene Arc is known to be involved in neural plasticity and memory and can be used as a marker for cell activity that occurs, for example, when hippocampal place cells fire. We report here, that Arc is expressed in a greater proportion of cells in dorsal CA1, CA3, and dentate gyrus (DG), following spatial behavioral experiences compared to ventral hippocampal subregions (dorsal CA1 = 33%; ventral CA1 = 13%; dorsal CA3 = 23%; ventral CA3 = 8%; and dorsal DG = 2.5%; ventral DG = 1.2%). The technique used here to obtain estimates of numbers of behavior-driven cells across the dorsal-ventral axis, however, corresponds quite well with samples from available single unit recording studies. Several explanations for the two- to-threefold reduction in spatial behavior-driven cell activity in the ventral hippocampus can be offered. These include anatomical connectivity differences, differential gain of the self-motion signals that appear to alter the scale of place fields and the proportion of active cells, and possibly variations in the neuronal responses to non-spatial information within the hippocampus along its dorso-ventral axis.
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Affiliation(s)
- M K Chawla
- ARL Div of Neural Systems, Memory and Aging and Evelyn F. McKnight Brain, Institute, Univ Arizona, Tucson, Arizona
| | - V L Sutherland
- National Toxicology Program, NIEHS, Research Triangle Park, North Carolina
| | - K Olson
- ARL Div of Neural Systems, Memory and Aging and Evelyn F. McKnight Brain, Institute, Univ Arizona, Tucson, Arizona
| | - B L McNaughton
- Canadian Centre for Behavioural Neuroscience, University of Lethbridge, T1K 3M4, Alberta.,Department of Neurobiology and Behavior, Center for Neurobiology of Learning and Memory, University California, Irvine, 92697
| | - C A Barnes
- ARL Div of Neural Systems, Memory and Aging and Evelyn F. McKnight Brain, Institute, Univ Arizona, Tucson, Arizona
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38
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Hippocampal Regulation of Postsynaptic Density Homer1 by Associative Learning. Neural Plast 2017; 2017:5959182. [PMID: 29238619 PMCID: PMC5697134 DOI: 10.1155/2017/5959182] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Revised: 09/18/2017] [Accepted: 10/10/2017] [Indexed: 11/18/2022] Open
Abstract
Genes involved in synaptic plasticity, particularly genes encoding postsynaptic density proteins, have been recurrently linked to psychiatric disorders including schizophrenia and autism. Postsynaptic density Homer1 proteins contribute to synaptic plasticity through the competing actions of short and long isoforms. The activity-induced expression of short Homer1 isoforms, Homer1a and Ania-3, is thought to be related to processes of learning and memory. However, the precise regulation of Homer1a and Ania-3 with different components of learning has not been investigated. Here, we used in situ hybridization to quantify short and long Homer1 expression in the hippocampus following consolidation, retrieval, and extinction of associative fear memory, using contextual fear conditioning in rats. Homer1a and Ania-3, but not long Homer1, were regulated by contextual fear learning or novelty detection, although their precise patterns of expression in hippocampal subregions were dependent on the isoform. We also show for the first time that the two short Homer1 isoforms are regulated after the retrieval and extinction of contextual fear memory, albeit with distinct temporal and spatial profiles. These findings support a role of activity-induced Homer1 isoforms in learning and memory processes in discrete hippocampal subregions and suggest that Homer1a and Ania-3 may play separable roles in synaptic plasticity.
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39
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Representation of environmental shape in the hippocampus of domestic chicks (Gallus gallus). Brain Struct Funct 2017; 223:941-953. [DOI: 10.1007/s00429-017-1537-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Accepted: 10/05/2017] [Indexed: 10/18/2022]
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40
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Wilkerson JR, Albanesi JP, Huber KM. Roles for Arc in metabotropic glutamate receptor-dependent LTD and synapse elimination: Implications in health and disease. Semin Cell Dev Biol 2017; 77:51-62. [PMID: 28969983 DOI: 10.1016/j.semcdb.2017.09.035] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 09/21/2017] [Accepted: 09/26/2017] [Indexed: 10/18/2022]
Abstract
The Arc gene is robustly transcribed in specific neural ensembles in response to experience-driven activity. Upon induction, Arc mRNA is transported to dendrites, where it can be rapidly and locally translated by activation of metabotropic glutamate receptors (mGluR1/5). mGluR-induced dendritic synthesis of Arc is implicated in weakening or elimination of excitatory synapses by triggering endocytosis of postsynaptic AMPARs in both hippocampal CA1 and cerebellar Purkinje neurons. Importantly, CA1 neurons with experience-induced Arc mRNA are susceptible, or primed for mGluR-induced long-term synaptic depression (mGluR-LTD). Here we review mechanisms and function of Arc in mGluR-LTD and synapse elimination and propose roles for these forms of plasticity in Arc-dependent formation of sparse neural representations of learned experience. We also discuss accumulating evidence linking dysregulation of Arc and mGluR-LTD in human cognitive disorders such as intellectual disability, autism and Alzheimer's disease.
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Affiliation(s)
- Julia R Wilkerson
- Departments of Neuroscience, University of Texas Southwestern Medical Center, Dallas, TX 75390, United States
| | - Joseph P Albanesi
- Departments of Pharmacology, University of Texas Southwestern Medical Center, Dallas, TX 75390, United States
| | - Kimberly M Huber
- Departments of Neuroscience, University of Texas Southwestern Medical Center, Dallas, TX 75390, United States.
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41
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Somatic Arc protein expression in hippocampal granule cells is increased in response to environmental change but independent of task-specific learning. Sci Rep 2017; 7:12477. [PMID: 28963515 PMCID: PMC5622137 DOI: 10.1038/s41598-017-12583-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Accepted: 09/08/2017] [Indexed: 01/04/2023] Open
Abstract
Activated neurons express immediate-early genes, such as Arc. Expression of Arc in the hippocampal granule cell layer, an area crucial for spatial learning and memory, is increased during acquisition of spatial learning; however, it is unclear whether this effect is related to the task-specific learning process or to nonspecific aspects of the testing procedure (e.g. exposure to the testing apparatus and exploration of the environment). Herein, we show that Arc-positive cells numbers are increased to the same extent in the granule cell layer after both acquisition of a single spatial learning event in the active place avoidance task and exploration of the testing environment, as compared to naïve (i.e. caged) mice. Repeated exposure the testing apparatus and environment did not reduce Arc expression. Furthermore, Arc expression did not correlate with performance in both adult and aged animals, suggesting that exploration of the testing environment, rather than the specific acquisition of the active place avoidance task, induces Arc expression in the dentate granule cell layer. These findings thus suggest that Arc is an experience-induced immediate-early gene.
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42
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Gröger N, Mannewitz A, Bock J, Becker S, Guttmann K, Poeggel G, Braun K. Infant avoidance training alters cellular activation patterns in prefronto-limbic circuits during adult avoidance learning: II. Cellular imaging of neurons expressing the activity-regulated cytoskeleton-associated protein (Arc/Arg3.1). Brain Struct Funct 2017; 223:713-725. [PMID: 28918435 DOI: 10.1007/s00429-017-1517-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Accepted: 09/09/2017] [Indexed: 12/24/2022]
Abstract
Positive and negative feedback learning is essential to optimize behavioral performance. We used the two-way active avoidance (TWA) task as an experimental paradigm for negative feedback learning with the aim to test the hypothesis that neuronal ensembles activate the activity-regulated cytoskeletal (Arc/Arg3.1) protein during different phases of avoidance learning and during retrieval. A variety of studies in humans and other animals revealed that the ability of aversive feedback learning emerges postnatally. Our previous findings demonstrated that rats, which as infants are not capable to learn an active avoidance strategy, show improved avoidance learning as adults. Based on these findings, we further tested the hypothesis that specific neuronal ensembles are "tagged" during infant TWA training and then reactivated during adult re-exposure to the same learning task. Using cellular imaging by immunocytochemical detection of Arc/Arg3.1, we observed that, compared to the untrained control group, (1) only in the dentate gyrus the density of Arc/Arg3.1-expressing neurons was elevated during the acquisition phase of TWA learning, and (2) this increase in Arc/Arg3.1-expressing neurons was not specific for the TWA learning task. With respect to the effects of infant TWA training we found that compared to the naïve non-pretrained group (a) the infant pretraining group displayed a higher density of Arc/Arg3.1-expressing neurons in the anterior cingulate cortex during acquisition on training day 1, and (b) the infant pretraining group displayed elevated density of Arc/Arg3.1-expressing neurons in the dentate gyrus during retrieval on test day 5. Correlation analysis for the acquisition phase revealed for the ACd that the animals which showed the highest number of avoidances and the fastest escape latencies displayed the highest density of Arc/Arg3.1-expressing neurons. Taken together, we are the first to use the synaptic plasticity protein Arc/Arg3.1 to label neuronal ensembles which are involved in different phases of active avoidance learning and whose activity patterns are changing in response to previous learning experience during infancy. Our results indicate (1) that, despite the inability to learn an active avoidance response in infancy, lasting memory traces are formed encoding the subtasks that are learned in infancy (e.g., the association of the CS and UCS, escape strategy), which are encoded in the infant brain by neuronal ensembles, which alter their synaptic connectivity via activation of specific synaptic plasticity proteins such as Arc/Arg3.1 and Egr1, and (2) that during adult training these memories can be retrieved by reactivating these neuronal ensembles and their synaptic circuits and thereby accelerate learning.
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Affiliation(s)
- Nicole Gröger
- Department of Zoology/Developmental Neurobiology, Otto von Guericke University, Leipziger Straße 44, Bldg. 91, 39120, Magdeburg, Germany
| | - Anja Mannewitz
- Department of Zoology/Developmental Neurobiology, Otto von Guericke University, Leipziger Straße 44, Bldg. 91, 39120, Magdeburg, Germany
| | - Jörg Bock
- FG Epigenetics and Structural Plasticity, Otto von Guericke University, Magdeburg, Germany.,Center for Behavioral Brain Science (CBBS), Magdeburg, Germany
| | - Susann Becker
- Department of Zoology/Developmental Neurobiology, Otto von Guericke University, Leipziger Straße 44, Bldg. 91, 39120, Magdeburg, Germany
| | - Katja Guttmann
- Department of Zoology/Developmental Neurobiology, Otto von Guericke University, Leipziger Straße 44, Bldg. 91, 39120, Magdeburg, Germany
| | - Gerd Poeggel
- Institute for Biology, Human Biology, University of Leipzig, 04103, Leipzig, Germany
| | - Katharina Braun
- Department of Zoology/Developmental Neurobiology, Otto von Guericke University, Leipziger Straße 44, Bldg. 91, 39120, Magdeburg, Germany. .,Center for Behavioral Brain Science (CBBS), Magdeburg, Germany.
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43
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Honjoh S, de Vivo L, Okuno H, Bito H, Tononi G, Cirelli C. Higher Arc Nucleus-to-Cytoplasm Ratio during Sleep in the Superficial Layers of the Mouse Cortex. Front Neural Circuits 2017; 11:60. [PMID: 28878629 PMCID: PMC5572345 DOI: 10.3389/fncir.2017.00060] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2017] [Accepted: 08/10/2017] [Indexed: 11/13/2022] Open
Abstract
The activity-regulated cytoskeleton associated protein Arc is strongly and quickly upregulated by neuronal activity, synaptic potentiation and learning. Arc entry in the synapse is followed by the endocytosis of glutamatergic AMPA receptors (AMPARs), and its nuclear accumulation has been shown in vitro to result in a small decline in the transcription of the GluA1 subunit of AMPARs. Since these effects result in a decline in synaptic strength, we asked whether a change in Arc dynamics may temporally correlate with sleep-dependent GluA1 down-regulation. We measured the ratio of nuclear to cytoplasmic Arc expression (Arc Nuc/Cyto) in the cerebral cortex of EGFP-Arc transgenic mice that were awake most of the night and then perfused immediately before lights on (W mice), or were awake most of the night and then allowed to sleep (S mice) or sleep deprived (SD mice) for the first 2 h of the light phase. In primary motor cortex (M1), neurons with high levels of nuclear Arc (High Arc cells) were present in all mice, but in these cells Arc Nuc/Cyto was higher in S mice than in W mice and, importantly, ~15% higher in S mice than in SD mice collected at the same time of day, ruling out circadian effects. Greater Arc Nuc/Cyto with sleep was observed in the superficial layers of M1, but not in the deep layers. In High Arc cells, Arc Nuc/Cyto was also ~15%-30% higher in S mice than in W and SD mice in the superficial layers of primary somatosensory cortex (S1) and cingulate cortex area 1 (Cg1). In High Arc Cells of Cg1, Arc Nuc/Cyto and cytoplasmic levels of GluA1 immunoreactivities in the soma were also negatively correlated, independent of behavioral state. Thus, Arc moves to the nucleus during both sleep and wake, but its nuclear to cytoplasmic ratio increases with sleep in the superficial layers of several cortical areas. It remains to be determined whether the relative increase in nuclear Arc contributes significantly to the overall decline in the strength of excitatory synapses that occurs during sleep. Similarly, it remains to be determined whether the entry of Arc into specific synapses is gated by sleep.
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Affiliation(s)
- Sakiko Honjoh
- Department of Psychiatry, University of Wisconsin-MadisonMadison, WI, United States
| | - Luisa de Vivo
- Department of Psychiatry, University of Wisconsin-MadisonMadison, WI, United States
| | - Hiroyuki Okuno
- Medical Innovation Center, Graduate School of Medicine, Kyoto UniversityKyoto, Japan
| | - Haruhiko Bito
- Department of Neurochemistry, Graduate School of Medicine, The University of TokyoTokyo, Japan
| | - Giulio Tononi
- Department of Psychiatry, University of Wisconsin-MadisonMadison, WI, United States
| | - Chiara Cirelli
- Department of Psychiatry, University of Wisconsin-MadisonMadison, WI, United States
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Trent S, Barnes P, Hall J, Thomas KL. AMPA receptors control fear extinction through an Arc-dependent mechanism. ACTA ACUST UNITED AC 2017; 24:375-380. [PMID: 28716957 PMCID: PMC5516687 DOI: 10.1101/lm.045013.117] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2017] [Accepted: 04/21/2017] [Indexed: 11/24/2022]
Abstract
Activity-regulated cytoskeleton-associated protein (Arc) supports fear memory through synaptic plasticity events requiring actin cytoskeleton rearrangements. We have previously shown that reducing hippocampal Arc levels through antisense knockdown leads to the premature extinction of contextual fear. Here we show that the AMPA receptor antagonist CNQX elevates hippocampal Arc levels during extinction and blocks extinction that can be rescued by reducing Arc. Increasing Arc levels with CNQX also overcomes the actin-destabilizing properties of cytochalasin D and promotes extinction. Therefore, extinction is dependent on AMPA-mediated reductions of Arc via a mechanism consistent with a role for Arc in stabilizing the actin cytoskeleton to constrain extinction.
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Affiliation(s)
- Simon Trent
- Neuroscience and Mental Health Research Institute, Cardiff University, Haydn Ellis Building, Cardiff CF24 4HQ, United Kingdom
| | - Philip Barnes
- Cardiff School of Biosciences, Cardiff University, Park Place, Cardiff CF10 3AX, United Kingdom
| | - Jeremy Hall
- Neuroscience and Mental Health Research Institute, Cardiff University, Haydn Ellis Building, Cardiff CF24 4HQ, United Kingdom.,MRC Centre for Neuropsychiatric Genetics and Genomics, Haydn Ellis Building, Cardiff University, Cardiff CF24 4HQ, United Kingdom
| | - Kerrie L Thomas
- Neuroscience and Mental Health Research Institute, Cardiff University, Haydn Ellis Building, Cardiff CF24 4HQ, United Kingdom.,Cardiff School of Biosciences, Cardiff University, Park Place, Cardiff CF10 3AX, United Kingdom
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45
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Leake J, Zinn R, Corbit L, Vissel B. Dissociation between complete hippocampal context memory formation and context fear acquisition. ACTA ACUST UNITED AC 2017; 24:153-157. [PMID: 28298553 PMCID: PMC5362699 DOI: 10.1101/lm.044578.116] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Accepted: 01/20/2017] [Indexed: 11/24/2022]
Abstract
Rodents require a minimal time period to explore a context prior to footshock to display plateau-level context fear at test. To investigate whether this rapid fear plateau reflects complete memory formation within that short time-frame, we used the immediate-early gene product Arc as an indicator of hippocampal context memory formation-related activity. We found that hippocampal Arc expression continued to increase well past the minimal time required for plateau-level fear. This raises the possibility that context fear conditioning occurs more rapidly than complete memory formation. Thus, animals may be able to condition robustly to both complete and incomplete contextual representations.
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Affiliation(s)
- Jessica Leake
- Neurodegenerative Disorders, Neuroscience Department, Garvan Institute of Medical Research, Sydney 2010, Australia.,School of Psychology, The University of Sydney, Sydney 2006, Australia
| | - Raphael Zinn
- Neurodegenerative Disorders, Neuroscience Department, Garvan Institute of Medical Research, Sydney 2010, Australia.,Faculty of Medicine, University of New South Wales, Sydney 2052, Australia.,School of Life Sciences, Faculty of Science, University of Technology Sydney, Sydney 2007, Australia
| | - Laura Corbit
- School of Psychology, The University of Sydney, Sydney 2006, Australia
| | - Bryce Vissel
- Neurodegenerative Disorders, Neuroscience Department, Garvan Institute of Medical Research, Sydney 2010, Australia.,Faculty of Medicine, University of New South Wales, Sydney 2052, Australia.,School of Life Sciences, Faculty of Science, University of Technology Sydney, Sydney 2007, Australia
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46
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Evidence for an Evolutionarily Conserved Memory Coding Scheme in the Mammalian Hippocampus. J Neurosci 2017; 37:2795-2801. [PMID: 28174334 DOI: 10.1523/jneurosci.3057-16.2017] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Revised: 01/06/2017] [Accepted: 01/25/2017] [Indexed: 01/01/2023] Open
Abstract
Decades of research identify the hippocampal formation as central to memory storage and recall. Events are stored via distributed population codes, the parameters of which (e.g., sparsity and overlap) determine both storage capacity and fidelity. However, it remains unclear whether the parameters governing information storage are similar between species. Because episodic memories are rooted in the space in which they are experienced, the hippocampal response to navigation is often used as a proxy to study memory. Critically, recent studies in rodents that mimic the conditions typical of navigation studies in humans and nonhuman primates (i.e., virtual reality) show that reduced sensory input alters hippocampal representations of space. The goal of this study was to quantify this effect and determine whether there are commonalities in information storage across species. Using functional molecular imaging, we observe that navigation in virtual environments elicits activity in fewer CA1 neurons relative to real-world conditions. Conversely, comparable neuronal activity is observed in hippocampus region CA3 and the dentate gyrus under both conditions. Surprisingly, we also find evidence that the absolute number of neurons used to represent an experience is relatively stable between nonhuman primates and rodents. We propose that this convergence reflects an optimal ensemble size for episodic memories.SIGNIFICANCE STATEMENT One primary factor constraining memory capacity is the sparsity of the engram, the proportion of neurons that encode a single experience. Investigating sparsity in humans is hampered by the lack of single-cell resolution and differences in behavioral protocols. Sparsity can be quantified in freely moving rodents, but extrapolating these data to humans assumes that information storage is comparable across species and is robust to restraint-induced reduction in sensory input. Here, we test these assumptions and show that species differences in brain size build memory capacity without altering the structure of the data being stored. Furthermore, sparsity in most of the hippocampus is resilient to reduced sensory information. This information is vital to integrating animal data with human imaging navigation studies.
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47
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Smith-Hicks CL, Cai P, Savonenko AV, Reeves RH, Worley PF. Increased Sparsity of Hippocampal CA1 Neuronal Ensembles in a Mouse Model of Down Syndrome Assayed by Arc Expression. Front Neural Circuits 2017; 11:6. [PMID: 28217086 PMCID: PMC5289947 DOI: 10.3389/fncir.2017.00006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2016] [Accepted: 01/19/2017] [Indexed: 02/05/2023] Open
Abstract
Down syndrome (DS) is the leading chromosomal cause of intellectual disability, yet the neural substrates of learning and memory deficits remain poorly understood. Here, we interrogate neural networks linked to learning and memory in a well-characterized model of DS, the Ts65Dn mouse. We report that Ts65Dn mice exhibit exploratory behavior that is not different from littermate wild-type (WT) controls yet behavioral activation of Arc mRNA transcription in pyramidal neurons of the CA1 region of the hippocampus is altered in Ts65Dn mice. In WT mice, a 5 min period of exploration of a novel environment resulted in Arc mRNA transcription in 39% of CA1 neurons. By contrast, the same period of exploration resulted in only ~20% of CA1 neurons transcribing Arc mRNA in Ts65Dn mice indicating increased sparsity of the behaviorally induced ensemble. Like WT mice the CA1 pyramidal neurons of Ts65Dn mice reactivated Arc transcription during a second exposure to the same environment 20 min after the first experience, but the size of the reactivated ensemble was only ~60% of that in WT mice. After repeated daily exposures there was a further decline in the size of the reactivated ensemble in Ts65Dn and a disruption of reactivation. Together these data demonstrate reduction in the size of the behaviorally induced network that expresses Arc in Ts65Dn mice and disruption of the long-term stability of the ensemble. We propose that these deficits in network formation and stability contribute to cognitive symptoms in DS.
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Affiliation(s)
- Constance L Smith-Hicks
- Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of MedicineBaltimore, MD, USA; Department of Neurology, Johns Hopkins University School of MedicineBaltimore, MD, USA
| | - Peiling Cai
- The State Key Laboratory of Biotherapy, West-China Hospital, Sichuan University Chengdu, China
| | - Alena V Savonenko
- Department of Pathology, Johns Hopkins University School of Medicine Baltimore, MD, USA
| | - Roger H Reeves
- Department of Physiology and Institute of Genetic Medicine, Johns Hopkins University, School of Medicine Baltimore, MD, USA
| | - Paul F Worley
- Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of MedicineBaltimore, MD, USA; Department of Neurology, Johns Hopkins University School of MedicineBaltimore, MD, USA
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48
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Hannapel RC, Henderson YH, Nalloor R, Vazdarjanova A, Parent MB. Ventral hippocampal neurons inhibit postprandial energy intake. Hippocampus 2017; 27:274-284. [PMID: 28121049 DOI: 10.1002/hipo.22692] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/05/2016] [Indexed: 12/12/2022]
Abstract
Evidence suggests that the memory of a recently ingested meal limits subsequent intake. Given that ventral hippocampal (vHC) neurons are involved in memory and energy intake, the present experiment tested the hypothesis that vHC neurons contribute to the formation of a memory of a meal and inhibit energy intake during the postprandial period. We tested (1) whether pharmacological inactivation of vHC neurons during the period following a sucrose meal, when the memory of the meal would be undergoing consolidation, accelerates the onset of the next sucrose meal and increases intake and (2) whether sucrose intake increases vHC expression of the synaptic plasticity marker activity-regulated cytoskeletal-associated protein (Arc). Adult male Sprague-Dawley rats were trained to consume a 32% sucrose solution daily at the same time and location. On the experimental day, the rats were given intra-vHC infusions of the GABAA receptor agonist muscimol or vehicle after they finished their first sucrose meal. Compared to vehicle infusions, postmeal intra-vHC muscimol infusions decreased the latency to the next sucrose meal, increased the amount of sucrose consumed during that meal, increased the total number of sucrose meals and the total amount of sucrose ingested. In addition, rats that consumed sucrose had higher levels of Arc expression in both vHC CA1 and CA3 subfields than cage control rats. Collectively, these findings are the first to show that vHC neurons inhibit energy intake during the postprandial period and support the hypothesis that vHC neurons form a memory of a meal and inhibit subsequent intake. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
| | - Yoko H Henderson
- Neuroscience Institute, Georgia State University, Atlanta, Georgia
| | - Rebecca Nalloor
- Neuroscience Institute, Augusta Biomedical Research Corporation, Charlie Norwood VA Medical Center, 950 15th Street, Augusta, Georgia
| | - Almira Vazdarjanova
- Department of Pharmacology and Toxicology, Augusta University, 1120 15th Street, CB 3526, Augusta, Georgia.,VA Research Service, Charlie Norwood VA Medical Center, 950 15th Street, Augusta, Georgia
| | - Marise B Parent
- Neuroscience Institute, Georgia State University, Atlanta, Georgia.,Department of Psychology, Georgia State University, Atlanta, Georgia
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Henderson YO, Nalloor R, Vazdarjanova A, Murphy AZ, Parent MB. Sex-dependent effects of early life inflammatory pain on sucrose intake and sucrose-associated hippocampal Arc expression in adult rats. Physiol Behav 2017; 173:1-8. [PMID: 28108332 DOI: 10.1016/j.physbeh.2017.01.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Revised: 01/09/2017] [Accepted: 01/13/2017] [Indexed: 12/14/2022]
Abstract
We hypothesize that dorsal hippocampal (dHC) neurons, which are critical for episodic memory, form a memory of a meal and inhibit the initiation of the next meal and the amount ingested during that meal. In support, we showed previously that (1) consuming a sucrose meal induces expression of the synaptic plasticity marker activity-regulated cytoskeleton-associated protein (Arc) in dHC neurons and (2) reversible inactivation of these neurons immediately following a sucrose meal accelerates the onset of the next meal and increases the size of that meal. These data suggest that hippocampal-dependent memory inhibits intake; therefore, the following experiments were conducted to determine whether hippocampal-dependent memory impairments are associated with increased intake. We reported recently that one episode of early life inflammatory pain impairs dHC-dependent memory in adult rats. The present study determined whether neonatal inflammatory pain also increases sucrose intake and attenuates sucrose-associated Arc expression. Male and female Sprague-Dawley rats were given an intraplantar injection of the inflammatory agent carrageenan (1%) on the day of birth and sucrose intake and sucrose-associated dHC Arc expression were measured in adulthood. Neonatal inflammatory pain increased sucrose intake in adult female and male rats, decreased sucrose-associated dHC Arc expression in female rats, and tended to have a similar effect on Arc expression in male rats. Neonatal inflammatory pain significantly decreased the interval between two sucrose meals in female but not in male rats. Morphine administration at the time of insult attenuated the effects of injury on sucrose intake. Collectively, these findings indicate that one brief episode of inflammatory pain on the day of birth has a long long-lasting, sex-dependent impact on intake of a palatable food in adulthood.
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Affiliation(s)
- Yoko O Henderson
- Neuroscience Institute, Georgia State University, P.O. Box 5030, Atlanta, GA 30302, United States.
| | - Rebecca Nalloor
- Augusta Biomedical Research Corporation, Charlie Norwood VA Medical Center, 950 15th Street, Augusta, GA 30901, United States.
| | - Almira Vazdarjanova
- Department of Pharmacology and Toxicology, Augusta University, 1120 15th Street, CB 3526, Augusta, GA 30912, United States; VA Research Service, Charlie Norwood VA Medical Center, 950 15th Street, Augusta, GA 30901, United States.
| | - Anne Z Murphy
- Neuroscience Institute, Georgia State University, P.O. Box 5030, Atlanta, GA 30302, United States.
| | - Marise B Parent
- Neuroscience Institute, Georgia State University, P.O. Box 5030, Atlanta, GA 30302, United States; Department of Psychology, Georgia State University, P.O. Box 5030, Atlanta, GA 30302, United States.
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Correia SS, Goosens KA. Input-specific contributions to valence processing in the amygdala. ACTA ACUST UNITED AC 2016; 23:534-43. [PMID: 27634144 PMCID: PMC5026206 DOI: 10.1101/lm.037887.114] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Accepted: 04/26/2016] [Indexed: 10/25/2022]
Abstract
Reward and punishment are often thought of as opposing processes: rewards and the environmental cues that predict them elicit approach and consummatory behaviors, while punishments drive aversion and avoidance behaviors. This framework suggests that there may be segregated brain circuits for these valenced behaviors. The basolateral amygdala (BLA) is one brain region that contributes to both types of motivated behavior. Individual neurons in the BLA can favor positive over negative valence, or vice versa, but these neurons are intermingled, showing no anatomical segregation. The amygdala receives inputs from many brain areas and current theories posit that encoding of positive versus negative valence by BLA neurons is determined by the wiring of each neuron. Specifically, many projections from other brain areas that respond to positive and negative valence stimuli and predictive cues project strongly to the BLA and likely contribute to valence processing within the BLA. Here we review three of these areas, the basal forebrain, the dorsal raphe nucleus and the ventral tegmental area, and discuss how these may promote encoding of positive and negative valence within the BLA.
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Affiliation(s)
- Susana S Correia
- McGovern Institute for Brain Research and Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Ki A Goosens
- McGovern Institute for Brain Research and Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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