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Valdivia G, Espinosa N, Lara-Vasquez A, Caneo M, Inostroza M, Born J, Fuentealba P. Sleep-dependent decorrelation of hippocampal spatial representations. iScience 2024; 27:110076. [PMID: 38883845 PMCID: PMC11176648 DOI: 10.1016/j.isci.2024.110076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 02/02/2024] [Accepted: 05/19/2024] [Indexed: 06/18/2024] Open
Abstract
Neuronal ensembles are crucial for episodic memory and spatial mapping. Sleep, particularly non-REM (NREM), is vital for memory consolidation, as it triggers plasticity mechanisms through brain oscillations that reactivate neuronal ensembles. Here, we assessed their role in consolidating hippocampal spatial representations during sleep. We recorded hippocampus activity in rats performing a spatial object-place recognition (OPR) memory task, during encoding and retrieval periods, separated by intervening sleep. Successful OPR retrieval correlated with NREM duration, during which cortical oscillations decreased in power and density as well as neuronal spiking, suggesting global downregulation of network excitability. However, neurons encoding specific spatial locations (i.e., place cells) or objects during OPR showed stronger synchrony with brain oscillations compared to non-encoding neurons, and the stability of spatial representations decreased proportionally with NREM duration. Our findings suggest that NREM sleep may promote flexible remapping in hippocampal ensembles, potentially aiding memory consolidation and adaptation to novel spatial contexts.
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Affiliation(s)
- Gonzalo Valdivia
- Laboratory of Neural Circuits, Departamento de Psiquiatria, Facultad de Medicina, Pontificia Universidad Catolica de Chile. Santiago, Chile
| | - Nelson Espinosa
- Laboratory of Neural Circuits, Departamento de Psiquiatria, Facultad de Medicina, Pontificia Universidad Catolica de Chile. Santiago, Chile
| | - Ariel Lara-Vasquez
- Laboratory of Neural Circuits, Departamento de Psiquiatria, Facultad de Medicina, Pontificia Universidad Catolica de Chile. Santiago, Chile
| | - Mauricio Caneo
- Laboratory of Neural Circuits, Departamento de Psiquiatria, Facultad de Medicina, Pontificia Universidad Catolica de Chile. Santiago, Chile
| | - Marion Inostroza
- Institute of Medical Psychology and Behavioral Neurobiology, University of Tübingen, Tübingen, Germany
| | - Jan Born
- Institute of Medical Psychology and Behavioral Neurobiology, University of Tübingen, Tübingen, Germany
| | - Pablo Fuentealba
- Laboratory of Neural Circuits, Departamento de Psiquiatria, Facultad de Medicina, Pontificia Universidad Catolica de Chile. Santiago, Chile
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2
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Aksamaz S, Mölle M, Akinola EO, Gromodka E, Bazhenov M, Marshall L. Single closed-loop acoustic stimulation targeting memory consolidation suppressed hippocampal ripple and thalamo-cortical spindle activity in mice. Eur J Neurosci 2024; 59:595-612. [PMID: 37605315 PMCID: PMC11214843 DOI: 10.1111/ejn.16116] [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: 12/02/2022] [Revised: 06/20/2023] [Accepted: 07/24/2023] [Indexed: 08/23/2023]
Abstract
Brain rhythms of sleep reflect neuronal activity underlying sleep-associated memory consolidation. The modulation of brain rhythms, such as the sleep slow oscillation (SO), is used both to investigate neurophysiological mechanisms as well as to measure the impact of sleep on presumed functional correlates. Previously, closed-loop acoustic stimulation in humans targeted to the SO Up-state successfully enhanced the slow oscillation rhythm and phase-dependent spindle activity, although effects on memory retention have varied. Here, we aim to disclose relations between stimulation-induced hippocampo-thalamo-cortical activity and retention performance on a hippocampus-dependent object-place recognition task in mice by applying acoustic stimulation at four estimated SO phases compared to sham condition. Across the 3-h retention interval at the beginning of the light phase closed-loop stimulation failed to improve retention significantly over sham. However, retention during SO Up-state stimulation was significantly higher than for another SO phase. At all SO phases, acoustic stimulation was accompanied by a sharp increase in ripple activity followed by about a second-long suppression of hippocampal sharp wave ripple and longer maintained suppression of thalamo-cortical spindle activity. Importantly, dynamics of SO-coupled hippocampal ripple activity distinguished SOUp-state stimulation. Non-rapid eye movement (NREM) sleep was not impacted by stimulation, yet preREM sleep duration was effected. Results reveal the complex effect of stimulation on the brain dynamics and support the use of closed-loop acoustic stimulation in mice to investigate the inter-regional mechanisms underlying memory consolidation.
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Affiliation(s)
- Sonat Aksamaz
- Institute of Experimental and Clinical Pharmacology,
University of Lübeck, Lübeck, Germany
- University Medical Center Schleswig-Holstein,
Lübeck, Germany
| | - Matthias Mölle
- University Medical Center Schleswig-Holstein,
Lübeck, Germany
- Center of Brain, Behavior and Metabolism, Lübeck,
Germany
| | - Esther Olubukola Akinola
- Institute of Experimental and Clinical Pharmacology,
University of Lübeck, Lübeck, Germany
- University Medical Center Schleswig-Holstein,
Lübeck, Germany
| | - Erik Gromodka
- Institute of Experimental and Clinical Pharmacology,
University of Lübeck, Lübeck, Germany
| | - Maxim Bazhenov
- Department of Medicine, University of California San Diego,
La Jolla, CA, USA
| | - Lisa Marshall
- Institute of Experimental and Clinical Pharmacology,
University of Lübeck, Lübeck, Germany
- University Medical Center Schleswig-Holstein,
Lübeck, Germany
- Center of Brain, Behavior and Metabolism, Lübeck,
Germany
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3
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Iwasaki S, Taniuchi T. Rats did not show evidence of prospective information-seeking: a pilot study. Front Behav Neurosci 2023; 17:1253780. [PMID: 38111475 PMCID: PMC10725935 DOI: 10.3389/fnbeh.2023.1253780] [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: 07/12/2023] [Accepted: 11/20/2023] [Indexed: 12/20/2023] Open
Abstract
Information-seeking behavior often features in research on metacognition in non-human animals; some species seek more information when they do not know the location of a food reward. Rats are known to do this in situations of uncertainty, but it is still unclear if they seek information prospectively for solving a later problem. In this study, we investigated rats' information-seeking responses in two areas that presented different cognitive challenges (N = 4). In one area, a memory task was presented in which rats could access a cue for a food reward during the information-seeking phase of a trial, but the cue was removed before the subsequent test phase. In the other area, a discrimination task presented a cue that was available in both the information-seeking and the test phases, so that it was not necessary to seek information prospectively. The memory and discrimination test trials were given in quasi-random order (Experiment 1). Rats explored in the memory task area no more than in the discrimination task area during the information-seeking phase, even after extensive training. When they were exposed exclusively to the memory task over multiple sessions (Experiment 2), they developed a strategy of exploring the available object cues. In Experiment 3, rats were found to stay longer in an area, which had an object than in other, less potentially informative areas; they were sensitive to the presence of information. Although these results did not support the existence of prospective information-seeking in rats, they do not necessarily imply that rats lack related abilities. This consideration is due to the constraints of the small sample size and the limited scope of the testing environment. Accumulating not only positive but also negative evidence would further understanding of the factors influencing metacognitive responses in non-human animals.
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Affiliation(s)
- Sumie Iwasaki
- Institute of Human and Social Sciences, Kanazawa University, Kanazawa, Japan
| | - Tohru Taniuchi
- Institute of Human and Social Sciences, Kanazawa University, Kanazawa, Japan
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4
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Contreras MP, Fechner J, Born J, Inostroza M. Accelerating Maturation of Spatial Memory Systems by Experience: Evidence from Sleep Oscillation Signatures of Memory Processing. J Neurosci 2023; 43:3509-3519. [PMID: 36931711 PMCID: PMC10184732 DOI: 10.1523/jneurosci.1967-22.2023] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 01/06/2023] [Accepted: 01/15/2023] [Indexed: 03/19/2023] Open
Abstract
During early development, memory systems gradually mature over time, in parallel with the gradual accumulation of knowledge. Yet, it is unknown whether and to what extent maturation is driven by discrete experience. Sleep is thought to contribute to the formation of long-term memory and knowledge through a systems consolidation process that is driven by specific sleep oscillations (i.e., ripples, spindles, and slow oscillations) in cortical and hippocampal networks. Based on these oscillatory signatures, we show here in rats that discrete spatial experience speeds the functional maturation of spatial memory systems during development. Juvenile male rats were exposed for 5 min periods to changes in the spatial configuration of two identical objects on postnatal day (PD)25, PD27, and PD29 (Spatial experience group), while a Control group was exposed on these occasions to the same two objects without changing their positions. On PD31, both groups were tested on a classical Object Place Recognition (OPR) task with a 3 h retention interval during which the sleep-associated EEG and hippocampal local field potentials were recorded. On PD31, consistent with forgoing studies, Control rats still did not express OPR memory. By contrast, rats with Spatial experience formed significant OPR memory and, in parallel, displayed an increased percentage of hippocampal ripples coupled to parietal slow oscillation-spindle complexes, and a stronger ripple-spindle phase-locking during the retention sleep. Our findings support the idea that experience promotes the maturation of memory systems during development by enhancing cortico-hippocampal information exchange and the formation of integrated knowledge representations during sleep.SIGNIFICANCE STATEMENT Cognitive and memory capabilities mature early in life. We show here that and how discrete spatial experience contributes to this process. Using a simple recognition paradigm in developing rats, we found that exposure of the rat pups to three short-lasting experiences enhances spatial memory capabilities to adult-like levels. The adult-like capability of building spatial memory was connected to a more precise coupling of ripples in the hippocampus with slow oscillation-spindle complexes in the thalamo-cortical system when the memory was formed during sleep. Our findings support the view that discrete experience accelerates maturation of cognitive and memory capabilities by enhancing the dialogue between hippocampus and cortex when these experiences are reprocessed during sleep.
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Affiliation(s)
- María P Contreras
- Institute of Medical Psychology and Behavioral Neurobiology, University of Tübingen, Tübingen, 72076, Germany
| | - Julia Fechner
- Institute of Medical Psychology and Behavioral Neurobiology, University of Tübingen, Tübingen, 72076, Germany
| | - Jan Born
- Institute of Medical Psychology and Behavioral Neurobiology, University of Tübingen, Tübingen, 72076, Germany
- German Center for Diabetes Research, Institute for Diabetes Research and Metabolic Diseases of the Helmholtz Center Munich at the University of Tübingen, Tübingen, 72076, Germany
- Werner Reichert Center for Integrative Neuroscience, University of Tübingen, Tübingen, 72076, Germany
| | - Marion Inostroza
- Institute of Medical Psychology and Behavioral Neurobiology, University of Tübingen, Tübingen, 72076, Germany
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5
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Aleman‐Zapata A, van der Meij J, Genzel L. Disrupting ripples: Methods, results, and caveats in closed-loop approaches in rodents. J Sleep Res 2022; 31:e13532. [PMID: 34913214 PMCID: PMC9787779 DOI: 10.1111/jsr.13532] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 11/23/2021] [Accepted: 11/26/2021] [Indexed: 12/30/2022]
Abstract
Hippocampal ripple oscillations have been associated with memory reactivations during wake and sleep. These reactivations should contribute to working memory and memory consolidation respectively. In the past decade studies have moved from being observational to actively disrupting ripple-related activity in closed-loop approaches to enable causal investigations into their function. All together these studies have been able to provide evidence that wake, task-related ripple activity is important for working memory and planning but less important for stabilisation of spatial representations. Rest and sleep-related ripple activity, in contrast, is important for long-term memory performance and thus memory consolidation. In this review, we summarise results from different closed-loop approaches in rodents. Further, we highlight differences in detection and stimulation methods as well as controls and discuss how these differences could influence outcomes.
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Affiliation(s)
- Adrian Aleman‐Zapata
- Donders Institute for BrainCognition and BehaviourRadboud UniversityNijmegenNetherlands
| | | | - Lisa Genzel
- Donders Institute for BrainCognition and BehaviourRadboud UniversityNijmegenNetherlands
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6
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Cho J, Pavlides C. Hippocampal cellular functional organization for fear memory: Effects of sleep. Hippocampus 2022; 32:839-856. [PMID: 36314648 DOI: 10.1002/hipo.23477] [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: 10/29/2021] [Revised: 09/21/2022] [Accepted: 09/30/2022] [Indexed: 11/04/2022]
Abstract
Memory is vital to our daily existence. Although a large number of studies have suggested that the hippocampus is dedicated to long-term memory, understanding how memory is anatomically encoded within the hippocampal neuronal network is still lacking. Previously our laboratory showed that hippocampal pyramidal cells are organized in cell clusters to encode both spatial and episodic memory. Based on these findings, we hypothesized that "cluster-type" is a functional organization principal in the hippocampus to encode all types of memory. Here, we tested whether contextual fear, another hippocampus-dependent memory, is also organized in cell clusters. We further investigated the possibility that post-learning sleep may affect functional organization. Cluster formation was examined by assessing the topographic localization of active cells using immediate early gene (IEG, Zif268) imaging methods. The first experiment provides evidence of a cluster-type organization in the hippocampus for fear memory by showing a spatial distribution of adjacent Zif268 positive cells. Exposure to the context itself, without electric shocks, induced a similar cellular formation; however, the degree of clustering was significantly lower. The second experiment provides evidence that sleep plays a role in the refinement and long-term stability of the clusters. The present results confirm the existence of a cluster-type topographic functional neuronal organization in the hippocampus for memory, and further suggest that post-learning sleep enhances the cluster-type organization.
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Affiliation(s)
- Jiyeon Cho
- Faculty of Human Sciences, University of Tsukuba, Ibaraki, Japan
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7
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Contributions of memory and brain development to the bioregulation of naps and nap transitions in early childhood. Proc Natl Acad Sci U S A 2022; 119:e2123415119. [PMID: 36279436 PMCID: PMC9636905 DOI: 10.1073/pnas.2123415119] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The transition from multiple sleep bouts each day to a single overnight sleep bout (i.e., nap transition) is a universal process in human development. Naps are important during infancy and early childhood as they enhance learning through memory consolidation. However, a normal part of development is the transition out of naps. Understanding nap transitions is essential in order to maximize early learning and promote positive long-term cognitive outcomes. Here, we propose a novel hypothesis regarding the cognitive, physiological, and neural changes that accompany nap transitions. Specifically, we posit that maturation of the hippocampal-dependent memory network results in more efficient memory storage, which reduces the buildup of homeostatic sleep pressure across the cortex (as reflected by slow-wave activity), and eventually, contributes to nap transitions. This hypothesis synthesizes evidence of bioregulatory mechanisms underlying nap transitions and sheds new light on an important window of change in development. This framework can be used to evaluate multiple untested predictions from the field of sleep science and ultimately, yield science-based guidelines and policies regarding napping in childcare and early education settings.
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8
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Simon KC, Clemenson GD, Zhang J, Sattari N, Shuster AE, Clayton B, Alzueta E, Dulai T, de Zambotti M, Stark C, Baker FC, Mednick SC. Sleep facilitates spatial memory but not navigation using the Minecraft Memory and Navigation task. Proc Natl Acad Sci U S A 2022; 119:e2202394119. [PMID: 36252023 PMCID: PMC9618094 DOI: 10.1073/pnas.2202394119] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Accepted: 08/04/2022] [Indexed: 11/18/2022] Open
Abstract
Sleep facilitates hippocampal-dependent memories, supporting the acquisition and maintenance of internal representation of spatial relations within an environment. In humans, however, findings have been mixed regarding sleep's contribution to spatial memory and navigation, which may be due to task designs or outcome measurements. We developed the Minecraft Memory and Navigation (MMN) task for the purpose of disentangling how spatial memory accuracy and navigation change over time, and to study sleep's independent contributions to each. In the MMN task, participants learned the locations of objects through free exploration of an open field computerized environment. At test, they were teleported to random positions around the environment and required to navigate to the remembered location of each object. In study 1, we developed and validated four unique MMN environments with the goal of equating baseline learning and immediate test performance. A total of 86 participants were administered the training phases and immediate test. Participants' baseline performance was equivalent across all four environments, supporting the use of the MMN task. In study 2, 29 participants were trained, tested immediately, and again 12 h later after a period of sleep or wake. We found that the metric accuracy of object locations, i.e., spatial memory, was maintained over a night of sleep, while after wake, metric accuracy declined. In contrast, spatial navigation improved over both sleep and wake delays. Our findings support the role of sleep in retaining the precise spatial relationships within a cognitive map; however, they do not support a specific role of sleep in navigation.
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Affiliation(s)
- Katharine C. Simon
- Department of Cognitive Sciences, School of Social Sciences, University of California, Irvine, CA 92697
| | - Gregory D. Clemenson
- Department of Neurobiology and Behavior, School of Biological Sciences, University of California, Irvine, CA 92697
| | - Jing Zhang
- Department of Cognitive Sciences, School of Social Sciences, University of California, Irvine, CA 92697
| | - Negin Sattari
- Department of Cognitive Sciences, School of Social Sciences, University of California, Irvine, CA 92697
| | - Alessandra E. Shuster
- Department of Cognitive Sciences, School of Social Sciences, University of California, Irvine, CA 92697
| | - Brandon Clayton
- Department of Cognitive Sciences, School of Social Sciences, University of California, Irvine, CA 92697
| | - Elisabet Alzueta
- Center for Health Sciences, SRI International, Menlo Park, CA 94025
| | - Teji Dulai
- Center for Health Sciences, SRI International, Menlo Park, CA 94025
| | | | - Craig Stark
- Department of Neurobiology and Behavior, School of Biological Sciences, University of California, Irvine, CA 92697
| | - Fiona C. Baker
- Center for Health Sciences, SRI International, Menlo Park, CA 94025
- Brain Function Research Group, School of Physiology, University of the Witwatersrand, Johannesburg, 2193, South Africa
| | - Sara C. Mednick
- Department of Cognitive Sciences, School of Social Sciences, University of California, Irvine, CA 92697
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9
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Harkotte M, Contreras MP, Inostroza M, Born J. Effects of Information Load on Schema and Episodic Memory Formation. Front Behav Neurosci 2022; 16:923713. [PMID: 35903219 PMCID: PMC9315445 DOI: 10.3389/fnbeh.2022.923713] [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: 04/19/2022] [Accepted: 06/14/2022] [Indexed: 12/14/2022] Open
Abstract
The formation of semantic memories is assumed to result from the abstraction of general, schema-like knowledge across multiple experiences, while at the same time, episodic details from individual experiences are forgotten. Against this backdrop, our study examined the effects of information load (high vs. low) during encoding on the formation of episodic and schema memory using an elaborated version of an object-place recognition (OPR) task in rats. The task allowed for the abstraction of a spatial rule across four (low information load) or eight (high information load) encoding episodes (spaced apart by a 20 min interval) in which the rats could freely explore two objects in an open field arena. After this encoding phase, animals were left undisturbed for 24 h and then tested either for the expression of schema memory, i.e., for the spatial rule, or memory for an individual encoding episode. Rats in the high information load condition exhibited a more robust schema memory for the spatial rule than in the low information load condition. In contrast, rats in the low load condition showed more robust memory for individual learning episodes than in the high information load condition. Our findings of opposing effects might point to an information-load-dependent competitive relationship between processes of schema and episodic memory formation, although other explanations are possible.
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Affiliation(s)
- Maximilian Harkotte
- Institute of Medical Psychology and Behavioral Neurobiology, University of Tübingen, Tübingen, Germany
- Graduate Training Centre of Neuroscience, International Max Planck Research School, Tübingen, Germany
| | - María P. Contreras
- Institute of Medical Psychology and Behavioral Neurobiology, University of Tübingen, Tübingen, Germany
| | - Marion Inostroza
- Institute of Medical Psychology and Behavioral Neurobiology, University of Tübingen, Tübingen, Germany
| | - Jan Born
- Institute of Medical Psychology and Behavioral Neurobiology, University of Tübingen, Tübingen, Germany
- German Center for Diabetes Research (DZD), Institute for Diabetes Research and Metabolic Diseases of the Helmholtz Center Munich at the University of Tübingen (IDM), Tübingen, Germany
- Center for Integrative Neuroscience, University of Tübingen, Tübingen, Germany
- *Correspondence: Jan Born
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10
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Pistono C, Zimmermann A, Morel C, Herbeaux K, Héraud C, Dumont-Kientzy S, Pevet P, Felder-Schmittbuhl MP, Mathis C. Major role of MT 2 receptors in the beneficial effect of melatonin on long-term recognition memory in C57BL/6J male mice. Horm Behav 2021; 136:105076. [PMID: 34634697 DOI: 10.1016/j.yhbeh.2021.105076] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 09/27/2021] [Accepted: 09/28/2021] [Indexed: 12/26/2022]
Abstract
Melatonin, a major signal of the circadian system, is also involved in brain functions such as learning and memory. Chronic melatonin treatment is known to improve memory performances, but the respective contribution of its central receptors, MT1 and MT2, is still unclear. Here, we used new single receptor deficient MT1-/- and MT2-/- mice to investigate the contribution of each receptor in the positive effect of chronic melatonin treatment on long-term recognition memory. The lack of MT2 receptor precluded memory-enhancing effect of melatonin in the object recognition task and to a lesser extent in the object location task, whereas the lack of MT1 receptor mitigated its effect in the object location task only. Our findings support a key role of MT2 in mediating melatonin's beneficial action on long-term object recognition memory, whereas MT1 may contribute to the effect on object location memory.
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Affiliation(s)
- Cristiana Pistono
- Université de Strasbourg, CNRS UMR 7364, Laboratoire de Neurosciences Cognitives et Adaptatives (LNCA), 12 rue Goethe, Strasbourg, France.
| | - Amandine Zimmermann
- Université de Strasbourg, CNRS UMR 7364, Laboratoire de Neurosciences Cognitives et Adaptatives (LNCA), 12 rue Goethe, Strasbourg, France
| | - Chloé Morel
- Université de Strasbourg, CNRS UMR 7364, Laboratoire de Neurosciences Cognitives et Adaptatives (LNCA), 12 rue Goethe, Strasbourg, France
| | - Karine Herbeaux
- Université de Strasbourg, CNRS UMR 7364, Laboratoire de Neurosciences Cognitives et Adaptatives (LNCA), 12 rue Goethe, Strasbourg, France
| | - Céline Héraud
- Université de Strasbourg, CNRS UMR 7364, Laboratoire de Neurosciences Cognitives et Adaptatives (LNCA), 12 rue Goethe, Strasbourg, France
| | - Stéphanie Dumont-Kientzy
- Université de Strasbourg, Centre National de la Recherche Scientifique, Institut des Neurosciences Cellulaires et Intégratives, F-67000 Strasbourg, France
| | - Paul Pevet
- Université de Strasbourg, Centre National de la Recherche Scientifique, Institut des Neurosciences Cellulaires et Intégratives, F-67000 Strasbourg, France
| | - Marie-Paule Felder-Schmittbuhl
- Université de Strasbourg, Centre National de la Recherche Scientifique, Institut des Neurosciences Cellulaires et Intégratives, F-67000 Strasbourg, France
| | - Chantal Mathis
- Université de Strasbourg, CNRS UMR 7364, Laboratoire de Neurosciences Cognitives et Adaptatives (LNCA), 12 rue Goethe, Strasbourg, France
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11
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Fitzroy AB, Kainec KA, Seo J, Spencer RMC. Encoding and consolidation of motor sequence learning in young and older adults. Neurobiol Learn Mem 2021; 185:107508. [PMID: 34450244 DOI: 10.1016/j.nlm.2021.107508] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 07/30/2021] [Accepted: 08/20/2021] [Indexed: 11/24/2022]
Abstract
Sleep benefits motor memory consolidation in young adults, but this benefit is reduced in older adults. Here we sought to understand whether differences in the neural bases of encoding between young and older adults contribute to aging-related differences in sleep-dependent consolidation of an explicit variant of the serial reaction time task (SRTT). Seventeen young and 18 older adults completed two sessions (nap, wake) one week apart. In the MRI, participants learned the SRTT. Following an afternoon interval either awake or with a nap (recorded with high-density polysomnography), performance on the SRTT was reassessed in the MRI. Imaging and behavioral results from SRTT performance showed clear sleep-dependent consolidation of motor sequence learning in older adults after a daytime nap, compared to an equal interval awake. Young adults, however, showed brain activity and behavior during encoding consistent with high SRTT performance prior to the sleep interval, and did not show further sleep-dependent performance improvements. Young adults did show reduced cortical activity following sleep, suggesting potential systems-level consolidation related to automatization. Sleep physiology data showed that sigma activity topography was affected by hippocampal and cortical activation prior to the nap in both age groups, and suggested a role of theta activity in sleep-dependent automatization in young adults. These results suggest that previously observed aging-related sleep-dependent consolidation deficits may be driven by aging-related deficiencies in fast learning processes. Here we demonstrate that when sufficient encoding strength is reached with additional training, older adults demonstrate intact sleep-dependent consolidation of motor sequence learning.
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Affiliation(s)
- Ahren B Fitzroy
- Neuroscience & Behavior Program, University of Massachusetts Amherst, United States; Department of Psychological & Brain Sciences, University of Massachusetts Amherst, United States.
| | - Kyle A Kainec
- Neuroscience & Behavior Program, University of Massachusetts Amherst, United States; Department of Psychological & Brain Sciences, University of Massachusetts Amherst, United States.
| | - Jeehye Seo
- Neuroscience & Behavior Program, University of Massachusetts Amherst, United States; Department of Psychological & Brain Sciences, University of Massachusetts Amherst, United States.
| | - Rebecca M C Spencer
- Neuroscience & Behavior Program, University of Massachusetts Amherst, United States; Department of Psychological & Brain Sciences, University of Massachusetts Amherst, United States; Institute for Applied Life Sciences, University of Massachusetts Amherst, United States.
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12
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Yuan RK, Lopez MR, Ramos-Alvarez MM, Normandin ME, Thomas AS, Uygun DS, Cerda VR, Grenier AE, Wood MT, Gagliardi CM, Guajardo H, Muzzio IA. Differential effect of sleep deprivation on place cell representations, sleep architecture, and memory in young and old mice. Cell Rep 2021; 35:109234. [PMID: 34133936 PMCID: PMC8545463 DOI: 10.1016/j.celrep.2021.109234] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 02/25/2021] [Accepted: 05/18/2021] [Indexed: 01/05/2023] Open
Abstract
Poor sleep quality is associated with age-related cognitive decline, and whether reversal of these alterations is possible is unknown. In this study, we report how sleep deprivation (SD) affects hippocampal representations, sleep patterns, and memory in young and old mice. After training in a hippocampus-dependent object-place recognition (OPR) task, control animals sleep ad libitum, although experimental animals undergo 5 h of SD, followed by recovery sleep. Young controls and old SD mice exhibit successful OPR memory, whereas young SD and old control mice are impaired. Successful performance is associated with two cellular phenotypes: (1) "context" cells, which remain stable throughout training and testing, and (2) "object configuration" cells, which remap when objects are introduced to the context and during testing. Additionally, effective memory correlates with spindle counts during non-rapid eye movement (NREM)/rapid eye movement (REM) sigma transitions. These results suggest SD may serve to ameliorate age-related memory deficits and allow hippocampal representations to adapt to changing environments.
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Affiliation(s)
- Robin K Yuan
- Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology, Brigham and Women's Hospital, 221 Longwood Avenue, Boston, MA, USA; Division of Sleep Medicine, Harvard Medical School, 221 Longwood Avenue, Boston, MA, USA
| | - Matthew R Lopez
- University of Texas at San Antonio, Department of Biology, One UTSA Circle, San Antonio, TX 78249, USA
| | | | - Marc E Normandin
- University of Texas at San Antonio, Department of Biology, One UTSA Circle, San Antonio, TX 78249, USA
| | - Arthur S Thomas
- Perelman School of Medicine, University of Pennsylvania, 3400 Civic Center Boulevard, Philadelphia, PA 19104, USA
| | - David S Uygun
- VA Boston Healthcare System and Department of Psychiatry, Harvard Medical School, West Roxbury, MA 02132, USA
| | - Vanessa R Cerda
- University of Texas at San Antonio, Department of Biology, One UTSA Circle, San Antonio, TX 78249, USA
| | - Amandine E Grenier
- University of Texas at San Antonio, Department of Biology, One UTSA Circle, San Antonio, TX 78249, USA
| | - Matthew T Wood
- University of Texas at San Antonio, Department of Biology, One UTSA Circle, San Antonio, TX 78249, USA
| | - Celia M Gagliardi
- University of Texas at San Antonio, Department of Biology, One UTSA Circle, San Antonio, TX 78249, USA
| | - Herminio Guajardo
- University of Texas at San Antonio, Department of Biology, One UTSA Circle, San Antonio, TX 78249, USA
| | - Isabel A Muzzio
- University of Texas at San Antonio, Department of Biology, One UTSA Circle, San Antonio, TX 78249, USA.
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13
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Shivacharan RS, Chiang CC, Wei X, Subramanian M, Couturier NH, Pakalapati N, Durand DM. Neural recruitment by ephaptic coupling in epilepsy. Epilepsia 2021; 62:1505-1517. [PMID: 33979453 DOI: 10.1111/epi.16903] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 03/30/2021] [Accepted: 03/30/2021] [Indexed: 11/28/2022]
Abstract
OBJECTIVE One of the challenges in treating patients with drug-resistant epilepsy is that the mechanisms of seizures are unknown. Most current interventions are based on the assumption that epileptic activity recruits neurons and progresses by synaptic transmission. However, several experimental studies have shown that neural activity in rodent hippocampi can propagate independently of synaptic transmission. Recent studies suggest these waves are self-propagating by electric field (ephaptic) coupling. In this study, we tested the hypothesis that neural recruitment during seizures can occur by electric field coupling. METHODS 4-Aminopyridine was used in both in vivo and in vitro preparation to trigger seizures or epileptiform activity. A transection was made in the in vivo hippocampus and in vitro hippocampal and cortical slices to study whether the induced seizure activity can recruit neurons across the gap. A computational model was built to test whether ephaptic coupling alone can account for neural recruitment across the transection. The model prediction was further validated by in vitro experiments. RESULTS Experimental results show that electric fields generated by seizure-like activity in the hippocampus both in vitro and in vivo can recruit neurons locally and through a transection of the tissue. The computational model suggests that the neural recruitment across the transection is mediated by electric field coupling. With in vitro experiments, we show that a dielectric material can block the recruitment of epileptiform activity across a transection, and that the electric fields measured within the gap are similar to those predicted by model simulations. Furthermore, this nonsynaptic neural recruitment is also observed in cortical slices, suggesting that this effect is robust in brain tissue. SIGNIFICANCE These results indicate that ephaptic coupling, a nonsynaptic mechanism, can underlie neural recruitment by a small electric field generated by seizure activity and could explain the low success rate of surgical transections in epilepsy patients.
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Affiliation(s)
- Rajat S Shivacharan
- Neural Engineering, Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio, USA
| | - Chia-Chu Chiang
- Neural Engineering, Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio, USA
| | - Xile Wei
- School of Electrical and Information Engineering, Tianjin University, Tianjin, China
| | - Muthumeenakshi Subramanian
- Neural Engineering, Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio, USA
| | - Nicholas H Couturier
- Neural Engineering, Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio, USA
| | - Nrupen Pakalapati
- Neural Engineering, Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio, USA
| | - Dominique M Durand
- Neural Engineering, Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio, USA
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14
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Jiang Y, Müller K, Khan MA, Assmann JC, Lampe J, Kilau K, Richter M, Kleint M, Ridder DA, Hübner N, Schmidt-Supprian M, Wenzel J, Schwaninger M. Cerebral angiogenesis ameliorates pathological disorders in Nemo-deficient mice with small-vessel disease. J Cereb Blood Flow Metab 2021; 41:219-235. [PMID: 32151223 PMCID: PMC8369998 DOI: 10.1177/0271678x20910522] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Cerebral small-vessel diseases (SVDs) often follow a progressive course. Little is known about the function of angiogenesis, which potentially induces regression of SVDs. Here, we investigated angiogenesis in a mouse model of incontinentia pigmenti (IP), a genetic disease comprising features of SVD. IP is caused by inactivating mutations of Nemo, the essential component of NF-κB signaling. When deleting Nemo in the majority of brain endothelial cells (NemobeKO mice), the transcriptional profile of vessels indicated cell proliferation. Brain endothelial cells expressed Ki67 and showed signs of DNA synthesis. In addition to cell proliferation, we observed sprouting and intussusceptive angiogenesis in NemobeKO mice. Angiogenesis occurred in all segments of the vasculature and in proximity to vessel rarefaction and tissue hypoxia. Apparently, NEMO was required for productive angiogenesis because endothelial cells that had escaped Nemo inactivation showed a higher proliferation rate than Nemo-deficient cells. Therefore, newborn endothelial cells were particularly vulnerable to ongoing recombination. When we interfered with productive angiogenesis by inducing ongoing ablation of Nemo, mice did not recover from IP manifestations but rather showed severe functional deficits. In summary, the data demonstrate that angiogenesis is present in this model of SVD and suggest that it may counterbalance the loss of vessels.
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Affiliation(s)
- Yun Jiang
- Institute for Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, Lübeck, Germany
| | - Kristin Müller
- Institute for Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, Lübeck, Germany
| | - Mahtab A Khan
- Institute for Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, Lübeck, Germany
| | - Julian C Assmann
- Institute for Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, Lübeck, Germany
| | - Josephine Lampe
- Institute for Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, Lübeck, Germany.,DZHK (German Research Centre for Cardiovascular Research), Germany
| | - Knut Kilau
- Institute for Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, Lübeck, Germany.,DZHK (German Research Centre for Cardiovascular Research), Germany
| | - Marius Richter
- Institute for Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, Lübeck, Germany
| | - Maximilian Kleint
- Institute for Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, Lübeck, Germany
| | - Dirk A Ridder
- Institute for Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, Lübeck, Germany
| | - Norbert Hübner
- DZHK (German Research Centre for Cardiovascular Research), Germany.,Max-Delbrück Center for Molecular Medicine, Berlin, Germany.,Charité-Universitätsmedizin Berlin, Charitéplatz 1, Berlin, Germany
| | - Marc Schmidt-Supprian
- Institute of Experimental Hematology, Klinikum Rechts der Isar, Technische Universität München, Munich, Germany
| | - Jan Wenzel
- Institute for Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, Lübeck, Germany.,DZHK (German Research Centre for Cardiovascular Research), Germany
| | - Markus Schwaninger
- Institute for Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, Lübeck, Germany.,DZHK (German Research Centre for Cardiovascular Research), Germany
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15
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Sawangjit A, Oyanedel CN, Niethard N, Born J, Inostroza M. Deepened sleep makes hippocampal spatial memory more persistent. Neurobiol Learn Mem 2020; 173:107245. [DOI: 10.1016/j.nlm.2020.107245] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 02/28/2020] [Accepted: 05/02/2020] [Indexed: 12/28/2022]
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16
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Rajizadeh MA, Esmaeilpour K, Motamedy S, Mohtashami Borzadaranb F, Sheibani V. Cognitive Impairments of Sleep-Deprived Ovariectomized (OVX) Female Rats by Voluntary Exercise. Basic Clin Neurosci 2020; 11:573-586. [PMID: 33643551 PMCID: PMC7878057 DOI: 10.32598/bcn.9.10.505] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2019] [Revised: 08/25/2019] [Accepted: 11/08/2019] [Indexed: 12/22/2022] Open
Abstract
Introduction: Previous studies demonstrated that forced and voluntary exercise had ameliorative effects on behavioral tasks followed by Sleep Deprivation (SD) in intact female rats. The main goal of this research was evaluating the impact of voluntary exercise on cognitive functions while SD and ovariectomization is induced in female wistar rats. Methods: The rats were anesthesized combining dosage of ketamine and xylazine. Then, both ovaries were eliminated and 3 weeks after surgery the animals entered the study. The exercise protocol took 4 weeks of voluntary exercise in a wheel which was connected to home cage. For inducing a 72 hours deprivation the multiple platforms was applied. The cognitive functions were studied by exploiting the Morris Water Maze (MWM) and Novel object recognition tests. Anxiety was evaluated by open field test and corticostrone measurement was carried out by ELISA method. One-way and two-way ANOVA and repeated measures were utilized for data analysis and P<0.05 was considered statistically significant. Results: We observed significant spatial and recognition learning and memory impairments in OVX sleep-deprived rats compared to the control group and voluntary exercise alleviated the SD-induced learning and memory defects. Conclusion: We concluded that voluntary exercise can improve cognitive impairments followed by SD in OVX female rats.
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Affiliation(s)
- Mohammad Amin Rajizadeh
- Department of Physiology, School of Medicine, Kerman University of Medical Sciences, Kerman, Iran.,Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran
| | - Khadijeh Esmaeilpour
- Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran
| | - Sina Motamedy
- Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran
| | | | - Vahid Sheibani
- Department of Physiology, School of Medicine, Kerman University of Medical Sciences, Kerman, Iran.,Neuroscience Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran
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17
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Rapid fast-delta decay following prolonged wakefulness marks a phase of wake-inertia in NREM sleep. Nat Commun 2020; 11:3130. [PMID: 32561733 PMCID: PMC7305232 DOI: 10.1038/s41467-020-16915-0] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Accepted: 05/30/2020] [Indexed: 11/25/2022] Open
Abstract
Sleep-wake driven changes in non-rapid-eye-movement sleep (NREM) sleep (NREMS) EEG delta (δ-)power are widely used as proxy for a sleep homeostatic process. Here, we noted frequency increases in δ-waves in sleep-deprived mice, prompting us to re-evaluate how slow-wave characteristics relate to prior sleep-wake history. We identified two classes of δ-waves; one responding to sleep deprivation with high initial power and fast, discontinuous decay during recovery sleep (δ2) and another unrelated to time-spent-awake with slow, linear decay (δ1). Reanalysis of previously published datasets demonstrates that δ-band heterogeneity after sleep deprivation is also present in human subjects. Similar to sleep deprivation, silencing of centromedial thalamus neurons boosted subsequent δ2-waves, specifically. δ2-dynamics paralleled that of temperature, muscle tone, heart rate, and neuronal ON-/OFF-state lengths, all reverting to characteristic NREMS levels within the first recovery hour. Thus, prolonged waking seems to necessitate a physiological recalibration before typical NREMS can be reinstated. Changes in EEG delta-activity are widely used as proxy of sleep propensity. Here the authors demonstrate in mice and humans the presence of two types of delta-waves, only one of which reports on prior sleep-wake history with dynamics denoting a wake-inertia process accompanying deepest non-rapid-eye-movement sleep (NREM) sleep.
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18
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Shahveisi K, Farnia V, Khazaie H, Ghazvini H, Nozari M, Khodamoradi M. Novel object recognition memory in REM sleep-deprived rats: Role of the cannabinoid CB 1 receptor. Behav Brain Res 2019; 381:112311. [PMID: 31711896 DOI: 10.1016/j.bbr.2019.112311] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Revised: 09/12/2019] [Accepted: 10/15/2019] [Indexed: 12/31/2022]
Abstract
A survey of the literature indicates that both rapid eye movement sleep deprivation (RSD) and activation of cannabinoid CB1 receptor (CB1R) may impair novel object recognition (NOR) memory in rodents. To our knowledge, so far, no previous study has investigated the probable effects of RSD on the different phases of NOR memory. Moreover, far too little attention has been paid to the potential role of the CB1R in the effects of RSD on object memory. Therefore, the major objective of this study was to investigate the probable role of the CB1R in the acquisition, consolidation, retrieval, and reconsolidation of NOR memory in the RSD rats. A 12-h paradigm of RSD using the multiple platform method did not affect acquisition, but it impaired the consolidation, retrieval, and reconsolidation of NOR memory. Administration of the CB1R antagonist rimonabant (1 or 3 mg/kg, i.p.) did not have significant effects on the acquisition and reconsolidation, but it improved RSD-induced impairment of the consolidation and retrieval of object memory, especially at the dose of 3 mg/kg. In addition, the RSD paradigm did not affect the levels of plasma corticosterone as an important marker of stress in rat. The results revealed that RSD may have different effects on the different phases of NOR memory which may not be attributable to the effects of stress. Our findings would seem to suggest that the CB1R can be targeted to, at least partially, modulate the adverse effects of RSD on the process of NOR memory.
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Affiliation(s)
- Kaveh Shahveisi
- Sleep Disorders Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Vahid Farnia
- Substance Abuse Prevention Research Center, Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Habibolah Khazaie
- Sleep Disorders Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Hamed Ghazvini
- Psychiatry and Behavioral Sciences Research Center, Addiction Institute, Mazandaran University of Medical Sciences, Sari, Mazandaran, Iran; Department of Neuroscience, School of Advanced Technologies in Medicine, Mazandaran University of Medical Sciences, Sari, Mazandaran, Iran
| | - Masoumeh Nozari
- Neuroscience Research Center, Institute of Neuropharmacology, Department of Physiology and Pharmacology, Afzalipour School of Medicine, Kerman University of Medical Sciences, Kerman, Iran
| | - Mehdi Khodamoradi
- Substance Abuse Prevention Research Center, Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran.
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19
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Kam K, Pettibone WD, Shim K, Chen RK, Varga AW. Dynamics of sleep spindles and coupling to slow oscillations following motor learning in adult mice. Neurobiol Learn Mem 2019; 166:107100. [PMID: 31622665 DOI: 10.1016/j.nlm.2019.107100] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 09/18/2019] [Accepted: 10/11/2019] [Indexed: 01/05/2023]
Abstract
Sleep spindles have been implicated in motor learning in human subjects, but their occurrence, timing in relation to cortical slow oscillations, and relationship to offline gains in motor learning have not been examined in animal models. In this study, we recorded EEG over bilateral primary motor cortex in conjunction with EMG for 24 h following a period of either baseline handling or following rotarod motor learning to monitor sleep. We measured several biophysical properties of sleep spindles and their temporal coupling with cortical slow oscillations (SO, <1 Hz) and cortical delta waves (1-4 Hz). Following motor learning, we found an increase in spindles during an early period of NREM sleep (1-4 h) without changes to biophysical properties such as spindle power, peak frequency and coherence. In this same period of early NREM sleep, both SO and delta power increased after motor learning. Notably, a vast majority of spindles were associated with minimal SO power, but in the subset that were associated with significant SO power (>1 z-score above the population mean), spindle-associated SO power was greater in spindles following motor learning compared to baseline sleep. Also, we did not observe a group-level preferred phase in spindle-SO or spindle-delta coupling. While SO power alone was not predictive of motor performance in early NREM sleep, both spindle density and the difference in the magnitude of the mean resultant vector length of the phase angle for SO-associated spindles, a measure of its coupling precision, were positively correlated with offline change in motor performance. These findings support a role for sleep spindles and their coupling to slow oscillations in motor learning and establish a model in which spindle timing and the brain circuits that support offline plasticity can be mechanistically explored.
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Affiliation(s)
- Korey Kam
- Mount Sinai Integrative Sleep Center, Division of Pulmonary, Critical Care, and Sleep Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Ward D Pettibone
- Mount Sinai Integrative Sleep Center, Division of Pulmonary, Critical Care, and Sleep Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Kaitlyn Shim
- Mount Sinai Integrative Sleep Center, Division of Pulmonary, Critical Care, and Sleep Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Rebecca K Chen
- Mount Sinai Integrative Sleep Center, Division of Pulmonary, Critical Care, and Sleep Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Andrew W Varga
- Mount Sinai Integrative Sleep Center, Division of Pulmonary, Critical Care, and Sleep Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.
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20
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Kim YK, Nam KI, Song J. The Glymphatic System in Diabetes-Induced Dementia. Front Neurol 2018; 9:867. [PMID: 30429819 PMCID: PMC6220044 DOI: 10.3389/fneur.2018.00867] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Accepted: 09/26/2018] [Indexed: 12/14/2022] Open
Abstract
The glymphatic system has emerged as an important player in central nervous system (CNS) diseases, by regulating the vasculature impairment, effectively controlling the clearance of toxic peptides, modulating activity of astrocytes, and being involved in the circulation of neurotransmitters in the brain. Recently, several studies have indicated decreased activity of the glymphatic pathway under diabetes conditions such as in insulin resistance and hyperglycemia. Furthermore, diabetes leads to the disruption of the blood-brain barrier and decrease of apolipoprotein E (APOE) expression and the secretion of norepinephrine in the brain, involving the impairment of the glymphatic pathway and ultimately resulting in cognitive decline. Considering the increased prevalence of diabetes-induced dementia worldwide, the relationship between the glymphatic pathway and diabetes-induced dementia should be investigated and the mechanisms underlying their relationship should be discussed to promote the development of an effective therapeutic approach in the near future. Here, we have reviewed recent evidence for the relationship between glymphatic pathway dysfunction and diabetes. We highlight that the enhancement of the glymphatic system function during sleep may be beneficial to the attenuation of neuropathology in diabetes-induced dementia. Moreover, we suggest that improving glymphatic system activity may be a potential therapeutic strategy for the prevention of diabetes-induced dementia.
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Affiliation(s)
- Young-Kook Kim
- Department of Biochemistry, Chonnam National University Medical School, Gwangju, South Korea.,Department of Biomedical Sciences, Center for Creative Biomedical Scientists, Chonnam National University, Gwangju, South Korea
| | - Kwang Il Nam
- Department of Anatomy, Chonnam National University Medical School, Gwangju, South Korea
| | - Juhyun Song
- Department of Biomedical Sciences, Center for Creative Biomedical Scientists, Chonnam National University, Gwangju, South Korea.,Department of Anatomy, Chonnam National University Medical School, Gwangju, South Korea
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21
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Stylianakis AA, Harmon-Jones SK, Richardson R, Baker KD. Differences in the persistence of spatial memory deficits induced by a chronic stressor in adolescents compared to juveniles. Dev Psychobiol 2018; 60:805-813. [PMID: 29943435 DOI: 10.1002/dev.21750] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 05/07/2018] [Accepted: 05/23/2018] [Indexed: 12/14/2022]
Abstract
Adolescence is thought of as a stress-sensitive developmental period. While many studies have compared adolescent responses to stress relative to that of adults, a growing body of work has examined stress responses in juveniles. Here we investigated if a chronic stressor has a differential effect on spatial memory in rats depending on whether it occurs during adolescence or the juvenile period. Male rats were exposed to the stress hormone corticosterone (Cort) in their drinking water, a vehicle control (2.5% ethanol), or water, for 7 days before being tested on a novel Object/Place task 6 days or 6 weeks later. Exposure to Cort or ethanol at either age impaired spatial memory at the 6-day test. The ethanol induced impairment was attenuated 6 weeks later. However, rats given Cort during adolescence, but not the juvenile period, were still impaired. Together, these results suggest that adolescence is indeed a stress-sensitive period.
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Affiliation(s)
| | | | - Rick Richardson
- School of Psychology, UNSW Sydney, Sydney, New South Wales, Australia
| | - Kathryn D Baker
- School of Psychology, UNSW Sydney, Sydney, New South Wales, Australia
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22
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Rajizadeh MA, Esmaeilpour K, Masoumi-Ardakani Y, Bejeshk MA, Shabani M, Nakhaee N, Ranjbar MP, Borzadaran FM, Sheibani V. Voluntary exercise impact on cognitive impairments in sleep-deprived intact female rats. Physiol Behav 2018; 188:58-66. [DOI: 10.1016/j.physbeh.2017.12.030] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Revised: 12/06/2017] [Accepted: 12/23/2017] [Indexed: 10/18/2022]
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23
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Cho J, Sypniewski KA, Arai S, Yamada K, Ogawa S, Pavlides C. Fear memory consolidation in sleep requires protein kinase A. ACTA ACUST UNITED AC 2018; 25:241-246. [PMID: 29661836 PMCID: PMC5903399 DOI: 10.1101/lm.046458.117] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Accepted: 02/05/2018] [Indexed: 01/30/2023]
Abstract
It is well established that protein kinase A (PKA) is involved in hippocampal dependent memory consolidation. Sleep is also known to play an important role in this process. However, whether sleep-dependent memory consolidation involves PKA activation has not been clearly determined. Using behavioral observation, animals were categorized into sleep and awake groups. We show that intrahippocampal injections of the PKA inhibitor Rp-cAMPs in post-contextual fear conditioning sleep produced a suppression of long-term fear memory, while injections of Rp-cAMPs during an awake state, at a similar time point, had no effect. In contrast, injections of the PKA activator Sp-cAMPs in awake state, rescued sleep deprivation-induced memory impairments. These results suggest that following learning, PKA activation specifically in sleep is required for the consolidation of long-term memory.
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Affiliation(s)
- Jiyeon Cho
- Faculty of Human Sciences, University of Tsukuba, Ibaraki 305-8577, Japan
| | | | - Shoko Arai
- Faculty of Human Sciences, University of Tsukuba, Ibaraki 305-8577, Japan
| | - Kazuo Yamada
- Faculty of Human Sciences, University of Tsukuba, Ibaraki 305-8577, Japan
| | - Sonoko Ogawa
- Faculty of Human Sciences, University of Tsukuba, Ibaraki 305-8577, Japan
| | - Constantine Pavlides
- Faculty of Human Sciences, University of Tsukuba, Ibaraki 305-8577, Japan .,The Rockefeller University, New York, New York 10065, USA
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24
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New waves: Rhythmic electrical field stimulation systematically alters spontaneous slow dynamics across mouse neocortex. Neuroimage 2018. [PMID: 29535027 DOI: 10.1016/j.neuroimage.2018.03.019] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
The signature rhythm of slow-wave forebrain activity is the large amplitude, slow oscillation (SO: ∼1 Hz) made up of alternating synchronous periods of activity and silence at the single cell and network levels. On each wave, the SO originates at a unique location and propagates across the neocortex. Attempts to manipulate SO activity using electrical fields have been shown to entrain cortical networks and enhance memory performance. However, neural activity during this manipulation has remained elusive due to methodological issues in typical electrical recordings. Here we took advantage of voltage-sensitive dye (VSD) imaging in a bilateral cortical preparation of urethane-anesthetized mice to track SO cortical activity and its modulation by sinusoidal electrical field stimulation applied to frontal regions. We show that under spontaneous conditions, the SO propagates in two main opposing directional patterns along an anterior lateral - posterior medial axis, displaying a rich variety of possible trajectories on any given wave. Under rhythmic field stimulation, new propagation patterns emerge, which are not observed under spontaneous conditions, reflecting stimulus-entrained activity with distributed and varied anterior initiation zones and a consistent termination zone in the posterior somatosensory cortex. Furthermore, stimulus-induced activity patterns tend to repeat cycle after cycle, showing higher stereotypy than during spontaneous activity. Our results show that slow electrical field stimulation robustly entrains and alters ongoing slow cortical dynamics during sleep-like states, suggesting a mechanism for targeting specific cortical representations to manipulate memory processes.
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25
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Mechanisms for Selective Single-Cell Reactivation during Offline Sharp-Wave Ripples and Their Distortion by Fast Ripples. Neuron 2017. [PMID: 28641116 DOI: 10.1016/j.neuron.2017.05.032] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Memory traces are reactivated selectively during sharp-wave ripples. The mechanisms of selective reactivation, and how degraded reactivation affects memory, are poorly understood. We evaluated hippocampal single-cell activity during physiological and pathological sharp-wave ripples using juxtacellular and intracellular recordings in normal and epileptic rats with different memory abilities. CA1 pyramidal cells participate selectively during physiological events but fired together during epileptic fast ripples. We found that firing selectivity was dominated by an event- and cell-specific synaptic drive, modulated in single cells by changes in the excitatory/inhibitory ratio measured intracellularly. This mechanism collapses during pathological fast ripples to exacerbate and randomize neuronal firing. Acute administration of a use- and cell-type-dependent sodium channel blocker reduced neuronal collapse and randomness and improved recall in epileptic rats. We propose that cell-specific synaptic inputs govern firing selectivity of CA1 pyramidal cells during sharp-wave ripples.
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26
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Thalamic Spindles Promote Memory Formation during Sleep through Triple Phase-Locking of Cortical, Thalamic, and Hippocampal Rhythms. Neuron 2017; 95:424-435.e6. [DOI: 10.1016/j.neuron.2017.06.025] [Citation(s) in RCA: 288] [Impact Index Per Article: 41.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Revised: 05/07/2017] [Accepted: 06/15/2017] [Indexed: 11/22/2022]
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27
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Constant Light Desynchronizes Olfactory versus Object and Visuospatial Recognition Memory Performance. J Neurosci 2017; 37:3555-3567. [PMID: 28264977 PMCID: PMC5373134 DOI: 10.1523/jneurosci.3213-16.2017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2016] [Revised: 01/12/2017] [Accepted: 02/04/2017] [Indexed: 01/03/2023] Open
Abstract
Circadian rhythms optimize physiology and behavior to the varying demands of the 24 h day. The master circadian clock is located in the suprachiasmatic nuclei (SCN) of the hypothalamus and it regulates circadian oscillators in tissues throughout the body to prevent internal desynchrony. Here, we demonstrate for the first time that, under standard 12 h:12 h light/dark (LD) cycles, object, visuospatial, and olfactory recognition performance in C57BL/6J mice is consistently better at midday relative to midnight. However, under repeated exposure to constant light (rLL), recognition performance becomes desynchronized, with object and visuospatial performance better at subjective midday and olfactory performance better at subjective midnight. This desynchrony in behavioral performance is mirrored by changes in expression of the canonical clock genes Period1 and Period2 (Per1 and Per2), as well as the immediate-early gene Fos in the SCN, dorsal hippocampus, and olfactory bulb. Under rLL, rhythmic Per1 and Fos expression is attenuated in the SCN. In contrast, hippocampal gene expression remains rhythmic, mirroring object and visuospatial performance. Strikingly, Per1 and Fos expression in the olfactory bulb is reversed, mirroring the inverted olfactory performance. Temporal desynchrony among these regions does not result in arrhythmicity because core body temperature and exploratory activity rhythms persist under rLL. Our data provide the first demonstration that abnormal lighting conditions can give rise to temporal desynchrony between autonomous circadian oscillators in different regions, with different consequences for performance across different sensory domains. Such a dispersed network of dissociable circadian oscillators may provide greater flexibility when faced with conflicting environmental signals. SIGNIFICANCE STATEMENT A master circadian clock in the suprachiasmatic nuclei (SCN) of the hypothalamus regulates physiology and behavior across the 24 h day by synchronizing peripheral clocks throughout the brain and body. Without the SCN, these peripheral clocks rapidly become desynchronized. Here, we provide a unique demonstration that, under lighting conditions in which the central clock in the SCN is dampened, peripheral oscillators in the hippocampus and olfactory bulb become desynchronized, along with the behavioral processes mediated by these clocks. Multiple clocks that adopt different phase relationships may enable processes occurring in different brain regions to be optimized to specific phases of the 24 h day. Moreover, such a dispersed network of dissociable circadian clocks may provide greater flexibility when faced with conflicting environmental signals (e.g., seasonal changes in photoperiod).
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Ward CP, Wooden JI, Kieltyka R. Effects of Sleep Deprivation on Spatial Learning and Memory in Juvenile and Young Adult Rats. ACTA ACUST UNITED AC 2017; 10:109-116. [PMID: 28959381 DOI: 10.1037/pne0000075] [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] [Indexed: 11/08/2022]
Abstract
Sleepiness is commonly seen in adolescents and can negatively impact school performance. Little research has investigated the impact of sleepiness in juvenile animals on spatial learning. Sprague-Dawley juvenile (<30 days) and young adult (>60 days) rats were sleep deprived for 24 hours and tested, along with controls, in a water maze task. Sleep deprived juveniles were slower to learn the location of the hidden platform than controls; however, adult performance was not impaired. Sleep deprivation did not impair recall during a probe trial for either age group. Sleep deprivation prior to testing slowed spatial learning in juveniles but not adults.
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Sawangjit A, Kelemen E, Born J, Inostroza M. Sleep Enhances Recognition Memory for Conspecifics as Bound into Spatial Context. Front Behav Neurosci 2017; 11:28. [PMID: 28270755 PMCID: PMC5319304 DOI: 10.3389/fnbeh.2017.00028] [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: 11/09/2016] [Accepted: 02/07/2017] [Indexed: 12/21/2022] Open
Abstract
Social memory refers to the fundamental ability of social species to recognize their conspecifics in quite different contexts. Sleep has been shown to benefit consolidation, especially of hippocampus-dependent episodic memory whereas effects of sleep on social memory are less well studied. Here, we examined the effect of sleep on memory for conspecifics in rats. To discriminate interactions between the consolidation of social memory and of spatial context during sleep, adult Long Evans rats performed on a social discrimination task in a radial arm maze. The Learning phase comprised three 10-min sampling sessions in which the rats explored a juvenile rat presented at a different arm of the maze in each session. Then the rats were allowed to sleep (n = 18) or stayed awake (n = 18) for 120 min. During the following 10-min Test phase, the familiar juvenile rat (of the Learning phase) was presented along with a novel juvenile rat, each rat at an opposite arm of the maze. Significant social recognition memory, as indicated by preferential exploration of the novel over the familiar conspecific, occurred only after post-learning sleep, but not after wakefulness. Sleep, compared with wakefulness, significantly enhanced social recognition during the first minute of the Test phase. However, memory expression depended on the spatial configuration: Significant social recognition memory emerged only after sleep when the rat encountered the novel conspecific at a place different from that of the familiar juvenile in the last sampling session before sleep. Though unspecific retrieval-related effects cannot entirely be excluded, our findings suggest that sleep, rather than independently enhancing social and spatial aspects of memory, consolidates social memory by acting on an episodic representation that binds the memory of the conspecific together with the spatial context in which it was recently encountered.
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Affiliation(s)
- Anuck Sawangjit
- Institute of Medical Psychology and Behavioral Neurobiology, University of Tübingen Tübingen, Germany
| | - Eduard Kelemen
- Institute of Medical Psychology and Behavioral Neurobiology, University of TübingenTübingen, Germany; National Institute of Mental HealthKlecany, Czechia
| | - Jan Born
- Institute of Medical Psychology and Behavioral Neurobiology, University of TübingenTübingen, Germany; German Center for Diabetes Research (DZD), Institute for Diabetes Research and Metabolic Diseases of the Helmholtz Center Munich at the University of Tübingen (IDM)Tübingen, Germany; Centre for Integrative Neuroscience, University of TübingenTübingen, Germany
| | - Marion Inostroza
- Institute of Medical Psychology and Behavioral Neurobiology, University of TübingenTübingen, Germany; Departamento de Psicología, Universidad de ChileSantiago, Chile
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Fraize N, Carponcy J, Joseph MA, Comte JC, Luppi PH, Libourel PA, Salin PA, Malleret G, Parmentier R. Levels of Interference in Long and Short-Term Memory Differentially Modulate Non-REM and REM Sleep. Sleep 2016; 39:2173-2188. [PMID: 27748246 DOI: 10.5665/sleep.6322] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Accepted: 08/03/2016] [Indexed: 12/26/2022] Open
Abstract
STUDY OBJECTIVES It is commonly accepted that sleep is beneficial to memory processes, but it is still unclear if this benefit originates from improved memory consolidation or enhanced information processing. It has thus been proposed that sleep may also promote forgetting of undesirable and non-essential memories, a process required for optimization of cognitive resources. We tested the hypothesis that non-rapid eye movement sleep (NREMS) promotes forgetting of irrelevant information, more specifically when processing information in working memory (WM), while REM sleep (REMS) facilitates the consolidation of important information. METHODS We recorded sleep patterns of rats trained in a radial maze in three different tasks engaging either the long-term or short-term storage of information, as well as a gradual level of interference. RESULTS We observed a transient increase in REMS amount on the day the animal learned the rule of a long-term/reference memory task (RM), and, in contrast, a positive correlation between the performance of rats trained in a WM task involving an important processing of interference and the amount of NREMS or slow wave activity. Various oscillatory events were also differentially modulated by the type of training involved. Notably, NREMS spindles and REMS rapid theta increase with RM training, while sharp-wave ripples increase with all types of training. CONCLUSIONS These results suggest that REMS, but also rapid oscillations occurring during NREMS would be specifically implicated in the long-term memory in RM, whereas NREMS and slow oscillations could be involved in the forgetting of irrelevant information required for WM.
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Affiliation(s)
- Nicolas Fraize
- Forgetting and Cortical Dynamics, Lyon Neuroscience Research Center, University Lyon 1, Lyon, France
| | - Julien Carponcy
- Forgetting and Cortical Dynamics, Lyon Neuroscience Research Center, University Lyon 1, Lyon, France
| | - Mickaël Antoine Joseph
- Forgetting and Cortical Dynamics, Lyon Neuroscience Research Center, University Lyon 1, Lyon, France
| | - Jean-Christophe Comte
- Biphoton Internal Facility, Lyon Neuroscience Research Center, University Lyon 1, Lyon, France
| | - Pierre-Hervé Luppi
- Pathophysiology of the Neural Networks of the Sleep/Wake Cycle, Lyon Neuroscience Research Center, University Lyon 1, Lyon, France
| | - Paul-Antoine Libourel
- Forgetting and Cortical Dynamics, Lyon Neuroscience Research Center, University Lyon 1, Lyon, France.,Pathophysiology of the Neural Networks of the Sleep/Wake Cycle, Lyon Neuroscience Research Center, University Lyon 1, Lyon, France
| | - Paul-Antoine Salin
- Forgetting and Cortical Dynamics, Lyon Neuroscience Research Center, University Lyon 1, Lyon, France.,Biphoton Internal Facility, Lyon Neuroscience Research Center, University Lyon 1, Lyon, France
| | - Gaël Malleret
- Forgetting and Cortical Dynamics, Lyon Neuroscience Research Center, University Lyon 1, Lyon, France
| | - Régis Parmentier
- Forgetting and Cortical Dynamics, Lyon Neuroscience Research Center, University Lyon 1, Lyon, France
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31
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Krishnan HC, Gandour CE, Ramos JL, Wrinkle MC, Sanchez-Pacheco JJ, Lyons LC. Acute Sleep Deprivation Blocks Short- and Long-Term Operant Memory in Aplysia. Sleep 2016; 39:2161-2171. [PMID: 27748243 DOI: 10.5665/sleep.6320] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 08/08/2016] [Indexed: 01/11/2023] Open
Abstract
STUDY OBJECTIVES Insufficient sleep in individuals appears increasingly common due to the demands of modern work schedules and technology use. Consequently, there is a growing need to understand the interactions between sleep deprivation and memory. The current study determined the effects of acute sleep deprivation on short and long-term associative memory using the marine mollusk Aplysia californica, a relatively simple model system well known for studies of learning and memory. METHODS Aplysia were sleep deprived for 9 hours using context changes and tactile stimulation either prior to or after training for the operant learning paradigm, learning that food is inedible (LFI). The effects of sleep deprivation on short-term (STM) and long-term memory (LTM) were assessed. RESULTS Acute sleep deprivation prior to LFI training impaired the induction of STM and LTM with persistent effects lasting at least 24 h. Sleep deprivation immediately after training blocked the consolidation of LTM. However, sleep deprivation following the period of molecular consolidation did not affect memory recall. Memory impairments were independent of handling-induced stress, as daytime handled control animals demonstrated no memory deficits. Additional training immediately after sleep deprivation failed to rescue the induction of memory, but additional training alleviated the persistent impairment in memory induction when training occurred 24 h following sleep deprivation. CONCLUSIONS Acute sleep deprivation inhibited the induction and consolidation, but not the recall of memory. These behavioral studies establish Aplysia as an effective model system for studying the interactions between sleep and memory formation.
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Affiliation(s)
- Harini C Krishnan
- Department of Biological Science, Florida State University, Tallahassee, FL.,Program in Neuroscience, Florida State University, Tallahassee, FL
| | | | - Joshua L Ramos
- Department of Biological Science, Florida State University, Tallahassee, FL
| | - Mariah C Wrinkle
- Department of Biological Science, Florida State University, Tallahassee, FL
| | | | - Lisa C Lyons
- Department of Biological Science, Florida State University, Tallahassee, FL.,Program in Neuroscience, Florida State University, Tallahassee, FL
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Wang M, Li D, Yun D, Zhuang Y, Repunte-Canonigo V, Sanna PP, Behnisch T. Translation of BDNF-gene transcripts with short 3' UTR in hippocampal CA1 neurons improves memory formation and enhances synaptic plasticity-relevant signaling pathways. Neurobiol Learn Mem 2016; 138:121-134. [PMID: 27394686 DOI: 10.1016/j.nlm.2016.07.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Revised: 06/29/2016] [Accepted: 07/06/2016] [Indexed: 12/23/2022]
Abstract
While the brain-derived neurotrophic factor (BDNF) gene and its multiple transcripts have been recognized as a key factor for learning, but the specific involvement of BDNF translated from BDNF transcripts with short-3' untranslated region (short 3' UTR) in learning and memory requires further analysis. In this paper, we present data to show that the transduction of hippocampal CA1 neurons with AAV9-5' UTR-BDNF (short 3' UTR)-IRES-ZsGreen and the subsequent expression of BDNF enhanced the phosphorylation of synaptic plasticity relevant proteins and improved passive avoidance and object location, but not object recognition memory. In addition, BDNF improved the relearning of object location. At higher BDNF overexpression levels, the fear behavior was accompanied with a decline in the passive avoidance memory 24h post training, and with an enhanced fear conditioning performance. In addition, these animals developed spontaneous seizures. Thus, the expression of BDNF in the hippocampal CA1 region has the potential to improve fear and object location memory in wild type mouse strains when the region and expression levels of BDNF are well controlled.
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Affiliation(s)
- Man Wang
- The Institutes of Brain Science, The State Key Laboratory of Medical Neurobiology, and The Collaborative Innovation Center for Brain Science, Fudan University, Shanghai, China
| | - Dongxue Li
- The Institutes of Brain Science, The State Key Laboratory of Medical Neurobiology, and The Collaborative Innovation Center for Brain Science, Fudan University, Shanghai, China
| | - Di Yun
- The Institutes of Brain Science, The State Key Laboratory of Medical Neurobiology, and The Collaborative Innovation Center for Brain Science, Fudan University, Shanghai, China
| | - Yinghan Zhuang
- The Institutes of Brain Science, The State Key Laboratory of Medical Neurobiology, and The Collaborative Innovation Center for Brain Science, Fudan University, Shanghai, China
| | - Vez Repunte-Canonigo
- Molecular and Cellular Neuroscience Department, The Scripps Research Institute, 10550 N Torrey Pines Road, La Jolla, CA 92037, USA
| | - Pietro Paolo Sanna
- Molecular and Cellular Neuroscience Department, The Scripps Research Institute, 10550 N Torrey Pines Road, La Jolla, CA 92037, USA
| | - Thomas Behnisch
- The Institutes of Brain Science, The State Key Laboratory of Medical Neurobiology, and The Collaborative Innovation Center for Brain Science, Fudan University, Shanghai, China.
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Korte M, Schmitz D. Cellular and System Biology of Memory: Timing, Molecules, and Beyond. Physiol Rev 2016; 96:647-93. [PMID: 26960344 DOI: 10.1152/physrev.00010.2015] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The storage of information in the mammalian nervous systems is dependent on a delicate balance between change and stability of neuronal networks. The induction and maintenance of processes that lead to changes in synaptic strength to a multistep process which can lead to long-lasting changes, which starts and ends with a highly choreographed and perfectly timed dance of molecules in different cell types of the central nervous system. This is accompanied by synchronization of specific networks, resulting in the generation of characteristic "macroscopic" rhythmic electrical fields, whose characteristic frequencies correspond to certain activity and information-processing states of the brain. Molecular events and macroscopic fields influence each other reciprocally. We review here cellular processes of synaptic plasticity, particularly functional and structural changes, and focus on timing events that are important for the initial memory acquisition, as well as mechanisms of short- and long-term memory storage. Then, we cover the importance of epigenetic events on the long-time range. Furthermore, we consider how brain rhythms at the network level participate in processes of information storage and by what means they participating in it. Finally, we examine memory consolidation at the system level during processes of sleep.
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Affiliation(s)
- Martin Korte
- Zoological Institute, Division of Cellular Neurobiology, Braunschweig, Germany; Helmholtz Centre for Infection Research, AG NIND, Braunschweig, Germany; and Neuroscience Research Centre, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - Dietmar Schmitz
- Zoological Institute, Division of Cellular Neurobiology, Braunschweig, Germany; Helmholtz Centre for Infection Research, AG NIND, Braunschweig, Germany; and Neuroscience Research Centre, Charité Universitätsmedizin Berlin, Berlin, Germany
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34
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Fogel SM, Ray LB, Binnie L, Owen AM. How to become an expert: A new perspective on the role of sleep in the mastery of procedural skills. Neurobiol Learn Mem 2015; 125:236-48. [PMID: 26477835 DOI: 10.1016/j.nlm.2015.10.004] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 10/01/2015] [Accepted: 10/07/2015] [Indexed: 12/29/2022]
Abstract
How do you get to Carnegie Hall? Practice, sleep, practice. With enough practice - and sleep - we adopt new strategies that eventually become automatic, and subsequently require only the refinement of the existing skill to become an "expert". It is not known whether sleep is involved in the mastery and refinement of new skills that lead to expertise, nor is it known whether this may be primarily dependent on rapid eye movement (REM), non-REM stage 2 (NREM2) or slow wave sleep (SWS). Here, we employed behavioural and scalp-recorded electroencephalography (EEG) techniques to investigate the post-learning changes in the architecture (e.g., REM, NREM2 and SWS duration) and the electrophysiological features (e.g., rapid eye movements, sleep spindles and slow wave activity) that characterize these sleep states as individuals progress from night to night, from "Novice" to "Experts" on a cognitive procedural task (e.g., the Tower of Hanoi task). Here, we demonstrate that speed of movements improves over the course of training irrespective of whether sleep or wake intervenes training sessions, whereas accuracy improves gradually, but only significantly over a night of sleep immediately prior to mastery of the task. On the night that subjects are first exposed to the task, the density of fast spindles increased significantly during both NREM2 and SWS accompanied by increased NREM2 sigma power and SWS delta power, whereas, on the night that subjects become experts on the task, they show increased REM sleep duration and spindles became larger in terms of amplitude and duration during SWS. Re-exposure to the task one-week after it had already been mastered resulted in increased NREM sleep duration, and again, increased spindle density of fast spindles during SWS and NREM2 and increased NREM2 sigma power and SWS delta power. Importantly, increased spindle density was correlated with overnight improvement in speed and accuracy. Taken together, these results help to elucidate how REM and NREM sleep are uniquely involved in memory consolidation over the course of the mastery of a new cognitively complex skill, and help to resolve controversies regarding sequential nature of memory processing during sleep in humans, for which consistent evidence is currently lacking.
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Affiliation(s)
- Stuart M Fogel
- The Brain & Mind Institute, Western University, London, Ontario, Canada; Department of Psychology, Western University, London, Ontario, Canada.
| | - Laura B Ray
- The Brain & Mind Institute, Western University, London, Ontario, Canada
| | - Lauren Binnie
- The Brain & Mind Institute, Western University, London, Ontario, Canada
| | - Adrian M Owen
- The Brain & Mind Institute, Western University, London, Ontario, Canada; Department of Psychology, Western University, London, Ontario, Canada
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35
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Buzsáki G. Hippocampal sharp wave-ripple: A cognitive biomarker for episodic memory and planning. Hippocampus 2015; 25:1073-188. [PMID: 26135716 PMCID: PMC4648295 DOI: 10.1002/hipo.22488] [Citation(s) in RCA: 916] [Impact Index Per Article: 101.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Accepted: 06/30/2015] [Indexed: 12/23/2022]
Abstract
Sharp wave ripples (SPW-Rs) represent the most synchronous population pattern in the mammalian brain. Their excitatory output affects a wide area of the cortex and several subcortical nuclei. SPW-Rs occur during "off-line" states of the brain, associated with consummatory behaviors and non-REM sleep, and are influenced by numerous neurotransmitters and neuromodulators. They arise from the excitatory recurrent system of the CA3 region and the SPW-induced excitation brings about a fast network oscillation (ripple) in CA1. The spike content of SPW-Rs is temporally and spatially coordinated by a consortium of interneurons to replay fragments of waking neuronal sequences in a compressed format. SPW-Rs assist in transferring this compressed hippocampal representation to distributed circuits to support memory consolidation; selective disruption of SPW-Rs interferes with memory. Recently acquired and pre-existing information are combined during SPW-R replay to influence decisions, plan actions and, potentially, allow for creative thoughts. In addition to the widely studied contribution to memory, SPW-Rs may also affect endocrine function via activation of hypothalamic circuits. Alteration of the physiological mechanisms supporting SPW-Rs leads to their pathological conversion, "p-ripples," which are a marker of epileptogenic tissue and can be observed in rodent models of schizophrenia and Alzheimer's Disease. Mechanisms for SPW-R genesis and function are discussed in this review.
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Affiliation(s)
- György Buzsáki
- The Neuroscience Institute, School of Medicine and Center for Neural Science, New York University, New York, New York
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36
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Zalai D, Carney CE, Sherman M, Shapiro CM, McShane K. Fatigue in chronic hepatitis C infection: Understanding patients' experience from a cognitive-behavioural perspective. Br J Health Psychol 2015; 21:157-72. [PMID: 26250404 DOI: 10.1111/bjhp.12155] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Revised: 07/11/2015] [Indexed: 12/17/2022]
Abstract
OBJECTIVES Fatigue is a leading concern of patients with chronic hepatitis C virus (HCV) infection. Despite its clinical significance, fatigue in HCV is poorly understood and therefore invariably under-treated. A cognitive-behavioural approach offers a framework to understand and treat fatigue, but the characteristics of fatigue in chronic HCV infection have not been documented from a cognitive-behavioural perspective. This study captured the common and unique aspects of fatigue from a cognitive-behavioural perspective in individuals with HCV infection and clinically significant fatigue. DESIGN Cross-sectional, qualitative using a critical realism approach. METHODS Fourteen individuals (64% women; age >18 years) participated in semi-structured interviews. The interviews documented the features, course, and perceived antecedents of fatigue; fatigue-specific cognitions; fatigue management behaviours; and the functional impact of fatigue. RESULTS Participants' descriptions included the aspects of fatigue that have been targets of cognitive-behavioural therapy in other medical conditions, including attributing fatigue to the illness; expectation of chronicity; low control; and fatigue-driven coping. There were also components of fatigue experience that appear to be unique characteristics of fatigue related to HCV, including predominantly physical fatigue; high acceptance of fatigue; and liver-protective diet as a fatigue management behaviour. CONCLUSIONS This was the first study to document the experience of fatigue in chronic HCV infection in a cognitive-behavioural framework. The findings suggest that the cognitive-behavioural approach can be applied to fatigue in chronic HCV infection. This would open an avenue to alleviate fatigue and thus improve the primary patient-reported outcome of the disease. STATEMENT OF CONTRIBUTION What is already known on this subject? Fatigue is a key patient-reported outcome measure of chronic hepatitis C virus (HCV) infection. Fatigue management is not part of the standard care, because fatigue is poorly characterized in this population. What does this study add? A cognitive-behavioural approach can be applied to understand fatigue in HCV infection. Identified aspects of fatigue (antecedents, consequences, cognitions, behaviours) that can be treatment targets. Cognitive-behavioural therapy would open a new treatment avenue to alleviate fatigue in HCV infection.
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Affiliation(s)
- Dora Zalai
- Department of Psychology, Ryerson University, Toronto, Ontario, Canada
| | - Colleen E Carney
- Department of Psychology, Ryerson University, Toronto, Ontario, Canada
| | - Morris Sherman
- Department of Gastroenterology, University Health Network, University of Toronto, Canada
| | - Colin M Shapiro
- Department of Psychiatry, University Health Network, University of Toronto, Canada.,Department of Ophthalmology, University Health Network, University of Toronto, Canada
| | - Kelly McShane
- Department of Psychology, Ryerson University, Toronto, Ontario, Canada
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37
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Dissociating the contributions of slow-wave sleep and rapid eye movement sleep to emotional item and source memory. Neurobiol Learn Mem 2015; 122:122-30. [DOI: 10.1016/j.nlm.2014.08.013] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 08/21/2014] [Accepted: 08/23/2014] [Indexed: 11/23/2022]
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38
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França ASC, Lobão-Soares B, Muratori L, Nascimento G, Winne J, Pereira CM, Jeronimo SMB, Ribeiro S. D2 dopamine receptor regulation of learning, sleep and plasticity. Eur Neuropsychopharmacol 2015; 25:493-504. [PMID: 25778861 DOI: 10.1016/j.euroneuro.2015.01.011] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Revised: 01/08/2015] [Accepted: 01/16/2015] [Indexed: 01/23/2023]
Abstract
Dopamine and sleep have been independently linked with hippocampus-dependent learning. Since D2 dopaminergic transmission is required for the occurrence of rapid-eye-movement (REM) sleep, it is possible that dopamine affects learning by way of changes in post-acquisition REM sleep. To investigate this hypothesis, we first assessed whether D2 dopaminergic modulation in mice affects novel object preference, a hippocampus-dependent task. Animals trained in the dark period, when sleep is reduced, did not improve significantly in performance when tested 24h after training. In contrast, animals trained in the sleep-rich light period showed significant learning after 24h. When injected with the D2 inverse agonist haloperidol immediately after the exploration of novel objects, animals trained in the light period showed reduced novelty preference upon retesting 24h later. Next we investigated whether haloperidol affected the protein levels of plasticity factors shown to be up-regulated in an experience-dependent manner during REM sleep. Haloperidol decreased post-exploration hippocampal protein levels at 3h, 6h and 12h for phosphorylated Ca(2+)/calmodulin-dependent protein kinase II, at 6h for Zif-268; and at 12h for the brain-derived neurotrophic factor. Electrophysiological and kinematic recordings showed a significant decrease in the amount of REM sleep following haloperidol injection, while slow-wave sleep remained unaltered. Importantly, REM sleep decrease across animals was strongly correlated with deficits in novelty preference (Rho=0.56, p=0.012). Altogether, the results suggest that the dopaminergic regulation of REM sleep affects learning by modulating post-training levels of calcium-dependent plasticity factors.
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Affiliation(s)
- A S C França
- Brain Institute, Federal University of Rio Grande do Norte (UFRN), 59056-450 Natal, RN, Brazil
| | - B Lobão-Soares
- Department of Biophysics and Pharmacology, Federal University of Rio Grande do Norte (UFRN), Brazil.
| | - L Muratori
- Brain Institute, Federal University of Rio Grande do Norte (UFRN), 59056-450 Natal, RN, Brazil; Department of Biochemistry, Federal University of Rio Grande do Norte (UFRN), Brazil
| | - G Nascimento
- Department of Biomedical Engineering, Federal University of Rio Grande do Norte (UFRN), Brazil; Edmond and Lily Safra International Institute of Neuroscience of Natal (ELS-IINN), Natal, RN, Brazil
| | - J Winne
- Edmond and Lily Safra International Institute of Neuroscience of Natal (ELS-IINN), Natal, RN, Brazil
| | - C M Pereira
- Edmond and Lily Safra International Institute of Neuroscience of Natal (ELS-IINN), Natal, RN, Brazil
| | - S M B Jeronimo
- Department of Biochemistry, Federal University of Rio Grande do Norte (UFRN), Brazil
| | - S Ribeiro
- Brain Institute, Federal University of Rio Grande do Norte (UFRN), 59056-450 Natal, RN, Brazil.
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39
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Atorvastatin Prevents Cognitive Deficits Induced by Intracerebroventricular Amyloid-β1–40 Administration in Mice: Involvement of Glutamatergic and Antioxidant Systems. Neurotox Res 2015; 28:32-42. [DOI: 10.1007/s12640-015-9527-y] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Revised: 03/12/2015] [Accepted: 03/19/2015] [Indexed: 12/12/2022]
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40
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Vorster AP, Born J. Sleep and memory in mammals, birds and invertebrates. Neurosci Biobehav Rev 2015; 50:103-19. [DOI: 10.1016/j.neubiorev.2014.09.020] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Revised: 09/24/2014] [Accepted: 09/27/2014] [Indexed: 01/04/2023]
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Vandresen-Filho S, França LM, Alcantara-Junior J, Nogueira LC, de Brito TM, Lopes L, Junior FM, Vanzeler ML, Bertoldo DB, Dias PG, Colla ARS, Hoeller A, Duzzioni M, Rodrigues ALS, de Lima TCM, Tasca CI, Viola GG. Statins enhance cognitive performance in object location test in albino Swiss mice: involvement of beta-adrenoceptors. Physiol Behav 2015; 143:27-34. [PMID: 25700896 DOI: 10.1016/j.physbeh.2015.02.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Revised: 12/22/2014] [Accepted: 02/16/2015] [Indexed: 12/11/2022]
Abstract
Statins are inhibitors of the 3-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) reductase, thereby inhibiting cell synthesis of cholesterol and isoprenoids. Moreover, several studies have been evaluating pleiotropic effects of statins, mainly because they present neuroprotective effects in various pathological conditions. However, knowledge about behavioral effects of statins per se is relatively scarce. Considering these facts, we aimed to analyze behavioral responses of atorvastatin or simvastatin-treated mice in the open field test, elevated plus maze and object location test. Atorvastatin treatment for 7 consecutive days at 1 mg/kg or 10 mg/kg (v.o.) or simvastatin 10 mg/kg or 20 mg/kg enhanced cognitive performance in object location test when compared to control group (saline-treated mice). Simvastatin effects on mice performance in the object location test was abolished by post-training infusion of the beta-adrenoceptor antagonist propranolol. Atorvastatin and simvastatin did not change the behavioral response in open field and elevated plus-maze (EPM) tests in any of the used doses. These data demonstrate the positive effects of both statins in cognitive processes in mice, without any alteration in locomotor parameters in the open field test or anxiolytic-like behavior in EPM. In conclusion, we demonstrate that atorvastatin and simvastatin per se improve the cognitive performance in a rodent model of spatial memory and this effect is related to beta-adrenergic receptors modulation.
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Affiliation(s)
- Samuel Vandresen-Filho
- Programa de Pós-graduação em Neurociências, Universidade Federal de Santa Catarina, Trindade, Florianópolis, SC, Brazil; Departamento de Ciências Básicas em Saúde, Universidade Federal de Mato Grosso, Boa Esperança, Cuiabá, MT, Brazil
| | - Lucas Moreira França
- Departamento de Ciências Básicas em Saúde, Universidade Federal de Mato Grosso, Boa Esperança, Cuiabá, MT, Brazil
| | - José Alcantara-Junior
- Departamento de Ciências Básicas em Saúde, Universidade Federal de Mato Grosso, Boa Esperança, Cuiabá, MT, Brazil
| | - Lucas Caixeta Nogueira
- Departamento de Ciências Básicas em Saúde, Universidade Federal de Mato Grosso, Boa Esperança, Cuiabá, MT, Brazil
| | - Thiago Marques de Brito
- Departamento de Ciências Básicas em Saúde, Universidade Federal de Mato Grosso, Boa Esperança, Cuiabá, MT, Brazil
| | - Lousã Lopes
- Departamento de Ciências Básicas em Saúde, Universidade Federal de Mato Grosso, Boa Esperança, Cuiabá, MT, Brazil
| | - Fernando Mesquita Junior
- Departamento de Ciências Básicas em Saúde, Universidade Federal de Mato Grosso, Boa Esperança, Cuiabá, MT, Brazil
| | - Maria Luzinete Vanzeler
- Departamento de Ciências Básicas em Saúde, Universidade Federal de Mato Grosso, Boa Esperança, Cuiabá, MT, Brazil
| | - Daniela Bohn Bertoldo
- Departamento de Bioquímica, Universidade Federal de Santa Catarina, Trindade, 88040-900 Florianópolis, SC, Brazil
| | - Paula Gomes Dias
- Departamento de Bioquímica, Universidade Federal de Santa Catarina, Trindade, 88040-900 Florianópolis, SC, Brazil; Laboratório de Genética do Comportamento, Departamento de Biologia Celular, Embriologia e Genética, Universidade Federal de Santa Catarina, Florianópolis, Brazil
| | - André R S Colla
- Programa de Pós-graduação em Neurociências, Universidade Federal de Santa Catarina, Trindade, Florianópolis, SC, Brazil
| | - Alexandre Hoeller
- Departamento de Farmacologia, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Trindade, Florianópolis, SC, Brazil
| | - Marcelo Duzzioni
- Departamento de Farmacologia, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Trindade, Florianópolis, SC, Brazil
| | - Ana Lúcia S Rodrigues
- Programa de Pós-graduação em Neurociências, Universidade Federal de Santa Catarina, Trindade, Florianópolis, SC, Brazil; Departamento de Bioquímica, Universidade Federal de Santa Catarina, Trindade, 88040-900 Florianópolis, SC, Brazil
| | - Thereza C M de Lima
- Departamento de Farmacologia, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Trindade, Florianópolis, SC, Brazil
| | - Carla Inês Tasca
- Programa de Pós-graduação em Neurociências, Universidade Federal de Santa Catarina, Trindade, Florianópolis, SC, Brazil; Departamento de Bioquímica, Universidade Federal de Santa Catarina, Trindade, 88040-900 Florianópolis, SC, Brazil
| | - Giordano Gubert Viola
- Programa de Pós-graduação em Neurociências, Universidade Federal de Santa Catarina, Trindade, Florianópolis, SC, Brazil; Programa de Pós-graduação em Ciências Fisiológicas, Universidade Federal de Sergipe, São Cristóvão, SE, Brazil.
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Transiently increasing cAMP levels selectively in hippocampal excitatory neurons during sleep deprivation prevents memory deficits caused by sleep loss. J Neurosci 2015; 34:15715-21. [PMID: 25411499 DOI: 10.1523/jneurosci.2403-14.2014] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The hippocampus is particularly sensitive to sleep loss. Although previous work has indicated that sleep deprivation impairs hippocampal cAMP signaling, it remains to be determined whether the cognitive deficits associated with sleep deprivation are caused by attenuated cAMP signaling in the hippocampus. Further, it is unclear which cell types are responsible for the memory impairments associated with sleep deprivation. Transgenic approaches lack the spatial resolution to manipulate specific signaling pathways selectively in the hippocampus, while pharmacological strategies are limited in terms of cell-type specificity. Therefore, we used a pharmacogenetic approach based on a virus-mediated expression of a Gαs-coupled Drosophila octopamine receptor selectively in mouse hippocampal excitatory neurons in vivo. With this approach, a systemic injection with the receptor ligand octopamine leads to increased cAMP levels in this specific set of hippocampal neurons. We assessed whether transiently increasing cAMP levels during sleep deprivation prevents memory consolidation deficits associated with sleep loss in an object-location task. Five hours of total sleep deprivation directly following training impaired the formation of object-location memories. Transiently increasing cAMP levels in hippocampal neurons during the course of sleep deprivation prevented these memory consolidation deficits. These findings demonstrate that attenuated cAMP signaling in hippocampal excitatory neurons is a critical component underlying the memory deficits in hippocampus-dependent learning tasks associated with sleep deprivation.
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Abstract
Schizophrenia patients often show irregularities in sleep and circadian rhythms and deficits in recognition memory. Similar phenotypes are seen in schizophrenia-relevant genetic mouse models, such as synaptosomal associated protein of 25 kDa (Snap-25) point mutant mice, vasoactive intestinal peptide receptor 2 (Vipr2) knockout mice, and neuregulin 1 (Nrg1)-deficient mice. Sleep and circadian abnormalities and impaired recognition memory may be causally related in both schizophrenia patients and schizophrenia-relevant mouse models, since sleep deprivation, abnormal photic input, and the manipulation of core clock genes (cryptochrome 1/2) can all disrupt object recognition memory in rodent models. The recognition deficits observed in patients and mouse models (both schizophrenia-related and -unrelated) are discussed here in terms of the dual-process theory of recognition, which postulates that there are two recognition mechanisms-recollection versus familiarity-that can be selectively impaired by brain lesions, neuropsychiatric conditions, and putatively, sleep and circadian rhythm disruption. However, based on this view, the findings from patient studies and studies using genetic mouse models (Nrg1 deficiency) seem to be inconsistent with each other. Schizophrenia patients are impaired at recollection (and to a lesser extent, familiarity judgments), but Nrg1-deficient mice are impaired at familiarity-based object recognition, raising concerns regarding the validity of using these genetically modified mice to model recognition phenotypes observed in patients. This issue can be resolved in future animal studies by examining performance in different variants of the spontaneous recognition task-the standard, perirhinal cortex-dependent, object recognition task versus the hippocampus-dependent object-place recognition task-in order to see which of the two recognition mechanisms is more disrupted.
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Oyanedel CN, Binder S, Kelemen E, Petersen K, Born J, Inostroza M. Role of slow oscillatory activity and slow wave sleep in consolidation of episodic-like memory in rats. Behav Brain Res 2014; 275:126-30. [DOI: 10.1016/j.bbr.2014.09.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Revised: 09/01/2014] [Accepted: 09/03/2014] [Indexed: 10/24/2022]
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Wooden JI, Pido J, Mathews H, Kieltyka R, Montemayor BA, Ward CP. Sleep deprivation impairs recall of social transmission of food preference in rats. Nat Sci Sleep 2014; 6:129-35. [PMID: 25395874 PMCID: PMC4226519 DOI: 10.2147/nss.s68611] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Evidence indicates that sleep plays an important role in learning and memory, and disruption of sleep especially seems to interfere with hippocampal memory processes. Social transmission of food preference (STFP), a natural test of paired associative learning, has been shown to be dependent on the hippocampus. While social transmission of food preference is not a novel task, it has not been used to examine the role of sleep in memory consolidation. Male Sprague-Dawley rats were randomly divided into three groups: cage control; sleep-deprived; and device control. Demonstrator rats were given powdered food mixed with a target spice. Test rats then interacted with demonstrator rats before being given a two choice test of powered food with the target spice or a novel spice. Sleep-deprived rats were then placed in an automated device that prevented sleep for 24 hours. After sleep deprivation, animals were given a preference test again to determine memory for the target spice at both 24 hours and 72 hours. Polysomnography was used to validate the method of sleep deprivation. During immediate preference testing, rats demonstrated a clear preference for the food containing the target spice. Rats that experienced 24 hours of sleep deprivation following the initial testing indicated a significant reduction in the recall of the target spice at 24 and 72 hours. The cage control and device animals maintained their preference for food containing the target spice. Therefore, the loss of sleep interfered with memory consolidation for food preference learned via social transmission.
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Affiliation(s)
- Jessica I Wooden
- Department of Psychology, University of Houston-Clear Lake, TX, USA
- Department of Psychology, University of Houston, TX, USA
| | - Jennifer Pido
- Department of Psychology, University of Houston-Clear Lake, TX, USA
| | - Hunter Mathews
- Department of Psychology, University of Houston-Clear Lake, TX, USA
| | - Ryan Kieltyka
- Department of Psychology, University of Houston-Clear Lake, TX, USA
| | | | - Christopher P Ward
- Department of Psychology, University of Houston-Clear Lake, TX, USA
- Menninger Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine, Houston, TX, USA
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Pereira de Vasconcelos A, Cassel JC. The nonspecific thalamus: A place in a wedding bed for making memories last? Neurosci Biobehav Rev 2014; 54:175-96. [PMID: 25451763 DOI: 10.1016/j.neubiorev.2014.10.021] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Revised: 10/11/2014] [Accepted: 10/23/2014] [Indexed: 01/30/2023]
Abstract
We summarize anatomical, electrophysiological and behavioral evidence that the rostral intralaminar (ILN) and the reuniens and rhomboid (ReRh) nuclei that belong to the nonspecific thalamus, might be part of a hippocampo-cortico-thalamic network underlying consolidation of enduring declarative(-like) memories at systems level. The first part of this review describes the anatomical and functional organization of these thalamic nuclei. The second part presents the theoretical models supporting the active systems-level consolidation, a process that relies upon sleep specific field-potential oscillations occurring during both slow-wave sleep (SWS) and rapid eye movement (REM) sleep. The last part presents data in the rat showing that the lesion of the rostral ILN or of the ReRh specifically hinders the formation of remote spatial memories without affecting task acquisition or retrieval of a recent memory. These results showing a critical role of the ILN and ReRh nuclei in the transformation of a recent memory into a remote one are discussed in the context of their control of cortical arousal (ARAS) and of thalamo-cortico-thalamic synchronization.
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Affiliation(s)
- Anne Pereira de Vasconcelos
- Laboratoire de Neurosciences Cognitives et Adaptatives, UMR 7364, Université de Strasbourg, CNRS, Faculté de Psychologie Neuropôle de Strasbourg - GDR CNRS 2905, 12 rue Goethe, F-67000 Strasbourg, France.
| | - Jean-Christophe Cassel
- Laboratoire de Neurosciences Cognitives et Adaptatives, UMR 7364, Université de Strasbourg, CNRS, Faculté de Psychologie Neuropôle de Strasbourg - GDR CNRS 2905, 12 rue Goethe, F-67000 Strasbourg, France
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Ishikawa H, Yamada K, Pavlides C, Ichitani Y. Sleep deprivation impairs spontaneous object-place but not novel-object recognition in rats. Neurosci Lett 2014; 580:114-8. [PMID: 25123440 DOI: 10.1016/j.neulet.2014.08.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Revised: 07/31/2014] [Accepted: 08/02/2014] [Indexed: 11/19/2022]
Abstract
Effects of sleep deprivation (SD) on one-trial recognition memory were investigated in rats using either a spontaneous novel-object or object-place recognition test. Rats were allowed to explore a field in which two identical objects were presented. After a delay period, they were placed again in the same field in which either: (1) one of the two objects was replaced by another object (novel-object recognition); or (2) one of the sample objects was moved to a different place (object-place recognition), and their exploration behavior to these objects was analyzed. Four hours SD immediately after the sample phase (early SD group) disrupted object-place recognition but not novel-object recognition, while SD 4-8h after the sample phase (delayed SD group) did not affect either paradigm. The results suggest that sleep selectively promotes the consolidation of hippocampal dependent memory, and that this effect is limited to within 4h after learning.
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Affiliation(s)
- Hiroko Ishikawa
- Institute of Psychology and Behavioral Neuroscience, University of Tsukuba, Tsukuba 305-8577, Ibaraki, Japan
| | - Kazuo Yamada
- Institute of Psychology and Behavioral Neuroscience, University of Tsukuba, Tsukuba 305-8577, Ibaraki, Japan.
| | - Constantine Pavlides
- Institute of Psychology and Behavioral Neuroscience, University of Tsukuba, Tsukuba 305-8577, Ibaraki, Japan
| | - Yukio Ichitani
- Institute of Psychology and Behavioral Neuroscience, University of Tsukuba, Tsukuba 305-8577, Ibaraki, Japan
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48
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Kelemen E, Bahrendt M, Born J, Inostroza M. Hippocampal corticosterone impairs memory consolidation during sleep but improves consolidation in the wake state. Hippocampus 2014; 24:510-5. [PMID: 24596244 PMCID: PMC4233998 DOI: 10.1002/hipo.22266] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/27/2014] [Indexed: 01/03/2023]
Abstract
We studied the interaction between glucocorticoid (GC) level and sleep/wake state during memory consolidation. Recent research has accumulated evidence that sleep supports memory consolidation in a unique physiological process, qualitatively distinct from consolidation occurring during wakefulness. This appears particularly true for memories that rely on the hippocampus, a region with abundant expression of GC receptors. Against this backdrop we hypothesized that GC effects on consolidation depend on the brain state, i.e., sleep and wakefulness. Following exploration of two objects in an open field, during 80 min retention periods rats received an intrahippocampal infusion of corticosterone (10 ng) or vehicle while asleep or awake. Then the memory was tested in the hippocampus-dependent object-place recognition paradigm. GCs impaired memory consolidation when administered during sleep but improved consolidation during the wake retention interval. Intrahippocampal infusion of GC or sleep/wake manipulations did not alter novel-object recognition performance that does not require the hippocampus. This work corroborates the notion of distinct consolidation processes occurring in sleep and wakefulnesss, and identifies GCs as a key player controlling distinct hippocampal memory consolidation processes in sleep and wake conditions.
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Affiliation(s)
- Eduard Kelemen
- Institute of Medical Psychology and Behavioral Neurobiology, University of Tübingen, 72076, Tübingen, Germany
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49
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Transcranial slow oscillation stimulation during sleep enhances memory consolidation in rats. Brain Stimul 2014; 7:508-15. [PMID: 24698973 DOI: 10.1016/j.brs.2014.03.001] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 02/24/2014] [Accepted: 03/01/2014] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND The importance of slow-wave sleep (SWS), hallmarked by the occurrence of sleep slow oscillations (SO), for the consolidation of hippocampus-dependent memories has been shown in numerous studies. Previously, the application of transcranial direct current stimulation, oscillating at the frequency of endogenous slow oscillations, during SWS enhanced memory consolidation for a hippocampus dependent task in humans suggesting a causal role of slowly oscillating electric fields for sleep dependent memory consolidation. OBJECTIVE Here, we aimed to replicate and extend these findings to a rodent model. METHODS Slow oscillatory direct transcranial current stimulation (SO-tDCS) was applied over the frontal cortex of rats during non-rapid eye movement (NREM) sleep and its effects on memory consolidation in the one-trial object-place recognition task were examined. A retention interval of 24 h was used to investigate the effects of SO-tDCS on long-term memory. RESULTS Animals' preference for the displaced object was significantly greater than chance only when animals received SO-tDCS. EEG spectral power indicated a trend toward a transient enhancement of endogenous SO activity in the SO-tDCS condition. CONCLUSIONS These results support the hypothesis that slowly oscillating electric fields causal affect sleep dependent memory consolidation, and demonstrate that oscillatory tDCS can be a valuable tool to investigate the function of endogenous cortical network activity.
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50
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Binder S, Rawohl J, Born J, Marshall L. Transcranial slow oscillation stimulation during NREM sleep enhances acquisition of the radial maze task and modulates cortical network activity in rats. Front Behav Neurosci 2014; 7:220. [PMID: 24409131 PMCID: PMC3884143 DOI: 10.3389/fnbeh.2013.00220] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2013] [Accepted: 12/20/2013] [Indexed: 01/01/2023] Open
Abstract
Slow wave sleep, hallmarked by the occurrence of slow oscillations (SO), plays an important role for the consolidation of hippocampus-dependent memories. Transcranial stimulation by weak electric currents oscillating at the endogenous SO frequency (SO-tDCS) during post-learning sleep was previously shown by us to boost SO activity and improve the consolidation of hippocampus-dependent memory in human subjects. Here, we aimed at replicating and extending these results to a rodent model. Rats were trained for 12 days at the beginning of their inactive phase in the reference memory version of the radial arm maze. In a between subjects design, animals received SO-tDCS over prefrontal cortex (PFC) or sham stimulation within a time frame of 1 h during subsequent non-rapid eye movement (NREM) sleep. Applied over multiple daily sessions SO-tDCS impacted cortical network activity as measured by EEG and behavior: at the EEG level, SO-tDCS enhanced post-stimulation upper delta (2–4 Hz) activity whereby the first stimulations of each day were preferentially affected. Furthermore, commencing on day 8, SO-tDCS acutely decreased theta activity indicating long-term effects on cortical networks. Behaviorally, working memory for baited maze arms was enhanced up to day 4, indicating enhanced consolidation of task-inherent rules, while reference memory errors did not differ between groups. Taken together, we could show here for the first time an effect of SO-tDCS during NREM sleep on cognitive functions and on cortical activity in a rodent model.
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Affiliation(s)
- Sonja Binder
- Department of Neuroendocrinology, University of Lübeck Lübeck, Germany
| | - Julia Rawohl
- Department of Neuroendocrinology, University of Lübeck Lübeck, Germany
| | - Jan Born
- Department of Neuroendocrinology, University of Lübeck Lübeck, Germany ; Institute of Medical Psychology and Behavioral Neurobiology, University of Tübingen Tübingen, Germany
| | - Lisa Marshall
- Department of Neuroendocrinology, University of Lübeck Lübeck, Germany ; Graduate School for Computing in Medicine and Life Sciences, University of Lübeck Lübeck, Germany
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