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Behrens LMP, Gasparotto J, Rampelotto PH, Escalona MAR, da Silva LDS, Carazza-Kessler FG, Barbosa CP, Campos MS, Dorn M, Gelain DP, Moreira JCF. Sodium propionate oral supplementation ameliorates depressive-like behavior through gut microbiome and histone 3 epigenetic regulation. J Nutr Biochem 2024; 130:109660. [PMID: 38685283 DOI: 10.1016/j.jnutbio.2024.109660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2023] [Revised: 03/30/2024] [Accepted: 04/23/2024] [Indexed: 05/02/2024]
Abstract
Major depressive disorder (MDD) is a global health concern, affecting over 250 million individuals worldwide. In recent years, the gut-brain axis has emerged as a promising field for understanding the pathophysiology of MDD. Microbial metabolites, such as short-chain fatty acids (SCFAs)-acetate, butyrate, and propionate-, have gained attention for their potential to influence epigenetic modifications within the host brain. However, the precise mechanisms through which these metabolites participate in MDD pathophysiology remain elusive. This study was designed to investigate the effects of oral SCFA supplementation in adult male Wistar rats subjected to chronic unpredictable mild stress (CUMS). A subset of control and CUMS-exposed rats received different supplementations: sodium acetate (NaOAc) at a concentration of 60 mM, sodium butyrate (NaB) at 40 mM, sodium propionate (NaP) at 50 mM, or a mixture of these SCFAs. The gut microbiome was assessed through 16S rRNA sequencing, and epigenetic profiling was performed using Western blot analysis. Results demonstrated that NaP supplementation significantly alleviated anhedonia in stressed animals, as evidenced by improved performance in the sucrose consumption test. This ameliorative effect was potentially associated with the modulation of gut bacterial communities, accompanied by the attenuation of the region-specific epigenetic dysregulation in the brain of the animals exposed to chronic stress. These findings suggest a potential association between gut dysbiosis and stress response, and NaP could be a promising target for future MDD interventions. However, further studies are needed to fully elucidate the underlying mechanisms of these effects.
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Affiliation(s)
- Luiza Marques Prates Behrens
- Center of Oxidative Stress Studies, Department of Biochemistry, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul - UFRGS, Porto Alegre 90035-003, Brazil; Graduate Program in Biological Sciences: Biochemistry, Federal University of Rio Grande do Sul - UFRGS, Porto Alegre 90035-003, Brazil; Graduate Program in Cellular and Molecular Biology, Center of Biotechnology, Federal University of Rio Grande do Sul - UFRGS, Porto Alegre 91501-970, Brazil.
| | - Juciano Gasparotto
- Center of Oxidative Stress Studies, Department of Biochemistry, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul - UFRGS, Porto Alegre 90035-003, Brazil
| | - Pabulo Henrique Rampelotto
- Bioinformatics and Biostatistics Core Facility, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul - UFRGS, Porto Alegre 91501-907, Brazil
| | - Manuel Adrian Riveros Escalona
- Graduate Program in Veterinary Sciences, Federal University of Rio Grande do Sul - UFRGS, Porto Alegre 91540-000, Brazil
| | - Lucas Dos Santos da Silva
- Center of Oxidative Stress Studies, Department of Biochemistry, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul - UFRGS, Porto Alegre 90035-003, Brazil; Graduate Program in Cellular and Molecular Biology, Center of Biotechnology, Federal University of Rio Grande do Sul - UFRGS, Porto Alegre 91501-970, Brazil
| | - Flávio Gabriel Carazza-Kessler
- Center of Oxidative Stress Studies, Department of Biochemistry, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul - UFRGS, Porto Alegre 90035-003, Brazil; Graduate Program in Biological Sciences: Biochemistry, Federal University of Rio Grande do Sul - UFRGS, Porto Alegre 90035-003, Brazil
| | - Camila Pocharski Barbosa
- Center of Oxidative Stress Studies, Department of Biochemistry, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul - UFRGS, Porto Alegre 90035-003, Brazil
| | - Marlene Soares Campos
- Center of Oxidative Stress Studies, Department of Biochemistry, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul - UFRGS, Porto Alegre 90035-003, Brazil
| | - Márcio Dorn
- Department of Theoretical Informatics, Institute of Informatics, Federal University of Rio Grande do Sul - UFRGS, Porto Alegre 91501-970, Brazil; Center of Biotechnology, Federal University of Rio Grande do Sul - UFRGS, Porto Alegre 91501-970, Brazil
| | - Daniel Pens Gelain
- Center of Oxidative Stress Studies, Department of Biochemistry, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul - UFRGS, Porto Alegre 90035-003, Brazil; Department of Biochemistry, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul - UFRGS, Porto Alegre 90035-003, Brazil
| | - José Cláudio Fonseca Moreira
- Center of Oxidative Stress Studies, Department of Biochemistry, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul - UFRGS, Porto Alegre 90035-003, Brazil; Department of Biochemistry, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul - UFRGS, Porto Alegre 90035-003, Brazil
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2
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Bin Ibrahim MZ, Wang Z, Sajikumar S. Synapses tagged, memories kept: synaptic tagging and capture hypothesis in brain health and disease. Philos Trans R Soc Lond B Biol Sci 2024; 379:20230237. [PMID: 38853570 DOI: 10.1098/rstb.2023.0237] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Accepted: 02/13/2024] [Indexed: 06/11/2024] Open
Abstract
The synaptic tagging and capture (STC) hypothesis lays the framework on the synapse-specific mechanism of protein synthesis-dependent long-term plasticity upon synaptic induction. Activated synapses will display a transient tag that will capture plasticity-related products (PRPs). These two events, tag setting and PRP synthesis, can be teased apart and have been studied extensively-from their electrophysiological and pharmacological properties to the molecular events involved. Consequently, the hypothesis also permits interactions of synaptic populations that encode different memories within the same neuronal population-hence, it gives rise to the associativity of plasticity. In this review, the recent advances and progress since the experimental debut of the STC hypothesis will be shared. This includes the role of neuromodulation in PRP synthesis and tag integrity, behavioural correlates of the hypothesis and modelling in silico. STC, as a more sensitive assay for synaptic health, can also assess neuronal aberrations. We will also expound how synaptic plasticity and associativity are altered in ageing-related decline and pathological conditions such as juvenile stress, cancer, sleep deprivation and Alzheimer's disease. This article is part of a discussion meeting issue 'Long-term potentiation: 50 years on'.
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Affiliation(s)
- Mohammad Zaki Bin Ibrahim
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore , Singapore 117597, Singapore
- Neurobiology Programme, Life Sciences Institute, National University of Singapore , Singapore 119077, Singapore
| | - Zijun Wang
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore , Singapore 117597, Singapore
- Neurobiology Programme, Life Sciences Institute, National University of Singapore , Singapore 119077, Singapore
| | - Sreedharan Sajikumar
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore , Singapore 117597, Singapore
- Neurobiology Programme, Life Sciences Institute, National University of Singapore , Singapore 119077, Singapore
- Healthy Longevity Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore , Singapore 117597, Singapore
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3
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Schomaker J, Ruitenberg MFL, Takeuchi T. Memory's penumbra in the older or pathological brain. Trends Cogn Sci 2023; 27:118-119. [PMID: 36517379 DOI: 10.1016/j.tics.2022.09.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 09/16/2022] [Accepted: 09/21/2022] [Indexed: 12/15/2022]
Affiliation(s)
- Judith Schomaker
- Institute of Psychology, Department of Health Medical and Neuropsychology, Leiden University, The Netherlands; Leiden Institute for Brain and Cognition, Leiden University Medical Center, The Netherlands.
| | - Marit F L Ruitenberg
- Institute of Psychology, Department of Health Medical and Neuropsychology, Leiden University, The Netherlands; Leiden Institute for Brain and Cognition, Leiden University Medical Center, The Netherlands
| | - Tomonori Takeuchi
- Danish Research Institute of Translational Neuroscience, DANDRITE, Nordic-EMBL Partnership for Molecular Medicine, Department of Biomedicine, Aarhus University, 8000, Aarhus C, Denmark
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4
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Chong YS, Wong LW, Gaunt J, Lee YJ, Goh CS, Morris RGM, Ch'ng TH, Sajikumar S. Distinct contributions of ventral CA1/amygdala co-activation to the induction and maintenance of synaptic plasticity. Cereb Cortex 2023; 33:676-690. [PMID: 35253866 DOI: 10.1093/cercor/bhac093] [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: 12/24/2021] [Revised: 02/11/2022] [Accepted: 02/12/2022] [Indexed: 02/03/2023] Open
Abstract
The amygdala is known to modulate hippocampal synaptic plasticity. One role could be an immediate effect of basolateral amygdala (BLA) in priming synaptic plasticity in the hippocampus. Another role could be through associative synaptic co-operation and competition that triggers events involved in the maintenance of synaptic potentiation. We present evidence that the timing and activity level of BLA stimulation are important factors for the induction and maintenance of long-term potentiation (LTP) in ventral hippocampal area CA1. A 100 Hz BLA co-stimulation facilitated the induction of LTP, whereas 200 Hz co-stimulation attenuated induction. A 100 Hz BLA co-stimulation also caused enhanced persistence, sufficient to prevent synaptic competition. This maintenance effect is likely through translational mechanisms, as mRNA expression of primary response genes was unaffected, whereas protein level of plasticity-related products was increased. Further understanding of the neural mechanisms of amygdala modulation on hippocampus could provide insights into the mechanisms of emotional disorders.
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Affiliation(s)
- Yee Song Chong
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, SIngapore 117597, Singapore.,Life Sciences Institute Neurobiology Programme, National University of Singapore, Singapore 117456, Singapore
| | - Lik-Wei Wong
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, SIngapore 117597, Singapore.,Life Sciences Institute Neurobiology Programme, National University of Singapore, Singapore 117456, Singapore.,Healthy Longevity Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117456, Singapore
| | - Jessica Gaunt
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 308232, Singapore
| | - Yan Jun Lee
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 308232, Singapore.,Interdisciplinary Graduate School, Nanyang Technological University, Singapore 637335, Singapore
| | - Cai Shan Goh
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, SIngapore 117597, Singapore.,Life Sciences Institute Neurobiology Programme, National University of Singapore, Singapore 117456, Singapore
| | - Richard G M Morris
- Laboratory for Cognitive Neuroscience, Centre for Cognitive and Neural Systems, University of Edinburgh, Edinburgh EH8 9JZ, Scotland
| | - Toh Hean Ch'ng
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 308232, Singapore.,School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore
| | - Sreedharan Sajikumar
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, SIngapore 117597, Singapore.,Life Sciences Institute Neurobiology Programme, National University of Singapore, Singapore 117456, Singapore.,Healthy Longevity Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117456, Singapore
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5
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Singh AK, Neo SH, Liwang C, Pang KKL, Leng JCK, Sinha SH, Shetty MS, Vasudevan M, Rao VJ, Joshi I, Eswaramoorthy M, Pavon MV, Sheila AR, Navakkode S, Kundu TK, Sajikumar S. Glucose derived carbon nanosphere (CSP) conjugated TTK21, an activator of the histone acetyltransferases CBP/p300, ameliorates amyloid-beta 1-42 induced deficits in plasticity and associativity in hippocampal CA1 pyramidal neurons. Aging Cell 2022; 21:e13675. [PMID: 35962576 PMCID: PMC9470894 DOI: 10.1111/acel.13675] [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: 12/03/2019] [Revised: 06/16/2022] [Accepted: 07/04/2022] [Indexed: 01/25/2023] Open
Abstract
The master epigenetic regulator lysine acetyltransferase (KAT) p300/CBP plays a pivotal role in neuroplasticity and cognitive functions. Recent evidence has shown that in several neurodegenerative diseases, including Alzheimer's disease (AD), the expression level and function of p300/CBP are severely compromised, leading to altered gene expression causing pathological conditions. Here, we show that p300/CBP activation by a small-molecule TTK21, conjugated to carbon nanosphere (CSP) ameliorates Aβ-impaired long-term potentiation (LTP) induced by high-frequency stimulation, theta burst stimulation, and synaptic tagging/capture (STC). This functional rescue was correlated with CSP-TTK21-induced changes in transcription and translation. Mechanistically, we observed that the expression of a large number of synaptic plasticity- and memory-related genes was rescued, presumably by the restoration of p300/CBP mediated acetylation. Collectively, these results suggest that small-molecule activators of p300/CBP could be a potential therapeutic molecule for neurodegenerative diseases like AD.
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Affiliation(s)
- Akash K. Singh
- Transcription and Disease Laboratory, Molecular Biology and Genetics UnitJawaharlal Nehru Centre for Advanced Scientific ResearchBengaluruIndia
| | - Sin H. Neo
- Department of PhysiologyYong Loo Lin School of Medicine, National University of SingaporeSingaporeSingapore
| | - Christine Liwang
- Department of PhysiologyYong Loo Lin School of Medicine, National University of SingaporeSingaporeSingapore
| | - Karen K. L. Pang
- Department of PhysiologyYong Loo Lin School of Medicine, National University of SingaporeSingaporeSingapore
| | - Jason C. K. Leng
- Department of PhysiologyYong Loo Lin School of Medicine, National University of SingaporeSingaporeSingapore
| | - Sarmistha H. Sinha
- Transcription and Disease Laboratory, Molecular Biology and Genetics UnitJawaharlal Nehru Centre for Advanced Scientific ResearchBengaluruIndia
| | - Mahesh S. Shetty
- Department of PhysiologyYong Loo Lin School of Medicine, National University of SingaporeSingaporeSingapore,Lee Kong Chian School of Medicine, Nanyang Technological UniversitySingaporeSingapore
| | - Madavan Vasudevan
- Department of Neuroscience and PharmacologyIowa Neuroscience Institute, Carver College of Medicine, University of IowaIowa CityIowaUSA
| | - Vinay J. Rao
- Transcription and Disease Laboratory, Molecular Biology and Genetics UnitJawaharlal Nehru Centre for Advanced Scientific ResearchBengaluruIndia
| | - Ila Joshi
- Transcription and Disease Laboratory, Molecular Biology and Genetics UnitJawaharlal Nehru Centre for Advanced Scientific ResearchBengaluruIndia
| | | | - Maria V. Pavon
- Department of PhysiologyYong Loo Lin School of Medicine, National University of SingaporeSingaporeSingapore
| | - Ang R. Sheila
- Department of PhysiologyYong Loo Lin School of Medicine, National University of SingaporeSingaporeSingapore
| | - Sheeja Navakkode
- Department of PhysiologyYong Loo Lin School of Medicine, National University of SingaporeSingaporeSingapore,Chemistry and Physics of Materials UnitJawaharlal Nehru Centre for Advanced Scientific ResearchBengaluruIndia
| | - Tapas K. Kundu
- Transcription and Disease Laboratory, Molecular Biology and Genetics UnitJawaharlal Nehru Centre for Advanced Scientific ResearchBengaluruIndia,Division of Neuroscience and Aging BiologyCSIR‐Central Drug Research Institute Sector 10LucknowUttar PradeshIndia
| | - Sreedharan Sajikumar
- Department of PhysiologyYong Loo Lin School of Medicine, National University of SingaporeSingaporeSingapore,Life Science Institute Neurobiology Programme (LSI)National University of SingaporeSingaporeSingapore,Healthy Longevity Translational Research ProgrammeYong Loo Lin School of Medicine, National University of SingaporeSingaporeSingapore
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6
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Dunsmoor JE, Murty VP, Clewett D, Phelps EA, Davachi L. Tag and capture: how salient experiences target and rescue nearby events in memory. Trends Cogn Sci 2022; 26:782-795. [PMID: 35842373 PMCID: PMC9378568 DOI: 10.1016/j.tics.2022.06.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 06/08/2022] [Accepted: 06/20/2022] [Indexed: 10/17/2022]
Abstract
The long-term fate of a memory is not exclusively determined by the events occurring at the moment of encoding. Research at the cellular, circuit, and behavioral levels is beginning to reveal how neurochemical activations in the moments surrounding an event can retroactively and proactively rescue weak memory for seemingly mundane experiences. We review emerging evidence showing enhancement of weakly formed memories encoded minutes to hours before or after a related motivationally relevant experience. We discuss proposed neurobiological mechanisms for strengthening weak memories formed in temporal proximity to a strong event, and how this knowledge could be leveraged to improve memory for information that is prone to forgetting.
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Affiliation(s)
- Joseph E Dunsmoor
- Department of Psychiatry and Behavioral Sciences, Dell Medical School, University of Texas at Austin, Austin, TX, USA; Institute for Neuroscience, University of Texas at Austin, Austin, TX, USA.
| | - Vishnu P Murty
- Department of Psychology, Temple University, Philadelphia, PA, USA
| | - David Clewett
- Department of Psychology, University of California, Los Angeles, CA, USA
| | | | - Lila Davachi
- Nathan Kline Institute, Orangeburg, NY, USA; Department of Psychology, Columbia University, New York, NY, USA.
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7
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Ding Y, Wang Y, Cao L. A Simplified Plasticity Model Based on Synaptic Tagging and Capture Theory: Simplified STC. Front Comput Neurosci 2022; 15:798418. [PMID: 35221955 PMCID: PMC8873158 DOI: 10.3389/fncom.2021.798418] [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: 10/20/2021] [Accepted: 12/27/2021] [Indexed: 01/06/2023] Open
Abstract
The formation and consolidation of memory play a vital role for survival in an ever-changing environment. In the brain, the change and stabilization of potentiated and depressed synapses are the neural basis of memory formation and maintenance. These changes can be induced by rather short stimuli (only a few seconds or even less) but should then be stable for months or years. Recently, the neural mechanism of conversion from rapid change during the early phase of synaptic plasticity into a stable memory trace in the late phase of synaptic plasticity is more and more clear at the protein and molecular levels, among which synaptic tagging and capture (STC) theory is one of the most popular theories. According to the STC theory, the change and stabilization of synaptic efficiency mainly depend on three processes related to calcium concentration, including synaptic tagging, synthesis of plasticity-related product (PRP), and the capture of PRP by tagged synapse. Based on the STC theory, several computational models are proposed. However, these models hardly take simplicity and biological interpretability into account simultaneously. Here, we propose a simplified STC (SM-STC) model to address this issue. In the SM-STC model, the concentration of calcium ion in each neuronal compartment and synapse is first calculated, and then the tag state of synapse and PRP are updated, and the coupling effect of tagged synapse and PRP is further considered to determine the plasticity state of the synapse, either potentiation or depression. We simulated the Schaffer collaterals pathway of the hippocampus targeting a multicompartment CA1 neuron for several hours of biological time. The results show that the SM-STC model can produce a broad range of experimental phenomena known in the physiological experiments, including long-term potentiation induced by high-frequency stimuli, long-term depression induced by low-frequency stimuli, and cross-capture with two stimuli separated by a delay. Thus, the SM-STC model proposed in this study provides an effective learning rule for brain-like computation on the premise of ensuring biological plausibility and computational efficiency.
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Affiliation(s)
- Yiwen Ding
- State Key Laboratory of Media Convergence and Communication, Communication University of China, Beijing, China
- Neuroscience and Intelligent Media Institute, Communication University of China, Beijing, China
| | - Ye Wang
- State Key Laboratory of Media Convergence and Communication, Communication University of China, Beijing, China
- Neuroscience and Intelligent Media Institute, Communication University of China, Beijing, China
- *Correspondence: Ye Wang,
| | - Lihong Cao
- State Key Laboratory of Media Convergence and Communication, Communication University of China, Beijing, China
- Neuroscience and Intelligent Media Institute, Communication University of China, Beijing, China
- State Key Laboratory of Mathematical Engineering and Advanced Computing, Wuxi, China
- Lihong Cao,
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8
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Fang P, Chen C, Zheng F, Jia J, Chen T, Zhu J, Chang J, Zhang Z. NLRP3 inflammasome inhibition by histone acetylation ameliorates sevoflurane-induced cognitive impairment in aged mice by activating the autophagy pathway. Brain Res Bull 2021; 172:79-88. [PMID: 33895270 DOI: 10.1016/j.brainresbull.2021.04.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 04/10/2021] [Accepted: 04/19/2021] [Indexed: 01/31/2023]
Abstract
Age-related cognitive impairment is associated with diminished autophagy and progressively increased neuroinflammation. Histone acetylation has been shown to be a key process in sevoflurane-induced neurobehavioral abnormalities. Here, we investigated whether histone acetylation regulates the interaction between autophagy and the NLRP3 inflammasome in models of sevoflurane-induced cognitive impairment and explored the underlying molecular mechanisms. Aged C57BL/6 J mice and cultured primary hippocampal neurons were exposed to 3% sevoflurane for 2 h. Hippocampal tissue samples and hippocampal neurons were harvested. The processes of histone acetylation and autophagy and the activation of the NLRP3 inflammasome were observed using western blotting, immunofluorescence staining, and transmission electron microscopy. Suberoylanilide hydroxamic acid (SAHA), an inhibitor of histone deacetylases, increased histone H3 and H4 acetylation in both the mouse hippocampus and primary neurons. Concomitantly, sevoflurane upregulated components of the NLRP3 inflammasome (NLRP3, cleaved caspase-1, and IL-1β) by promoting autophagic degradation in the aging brain. Cognitive deficits and inadequate autophagy induced by sevoflurane were reversed and NLRP3 inflammasome activation was inhibited by SAHA. Treatment with 3-MA, an autophagy inhibitor, eliminated the neuroprotective effects of SAHA on improving cognition in mice, activating autophagy and downregulating the NLRP3 inflammasome. Based on these results, histone acetylation activates autophagy plays an important role in inhibiting the activation of the NLRP3 inflammasome to protect the host from excessive neuroinflammation and sevoflurane-induced cognitive dysfunction in the aging brain.
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Affiliation(s)
- Peng Fang
- Department of Anaesthesiology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei, 430071, China; Department of Anaesthesiology, First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, 310003, China
| | - Chang Chen
- Department of Anaesthesiology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei, 430071, China
| | - Feng Zheng
- Department of Anaesthesiology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei, 430071, China
| | - Junke Jia
- Department of Anaesthesiology, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, 310002, China
| | - Ting Chen
- Department of Anaesthesiology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei, 430071, China
| | - Jinpiao Zhu
- Department of Anaesthesiology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei, 430071, China
| | - Jing Chang
- Department of Anaesthesiology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei, 430071, China
| | - Zongze Zhang
- Department of Anaesthesiology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei, 430071, China.
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9
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Bin Ibrahim MZ, Benoy A, Sajikumar S. Long-term plasticity in the hippocampus: maintaining within and 'tagging' between synapses. FEBS J 2021; 289:2176-2201. [PMID: 34109726 DOI: 10.1111/febs.16065] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 05/15/2021] [Accepted: 06/01/2021] [Indexed: 12/11/2022]
Abstract
Synapses between neurons are malleable biochemical structures, strengthening and diminishing over time dependent on the type of information they receive. This phenomenon known as synaptic plasticity underlies learning and memory, and its different forms, long-term potentiation (LTP) and long-term depression (LTD), perform varied cognitive roles in reinforcement, relearning and associating memories. Moreover, both LTP and LTD can exist in an early transient form (early-LTP/LTD) or a late persistent form (late-LTP/LTD), which are triggered by different induction protocols, and also differ in their dependence on protein synthesis and the involvement of key molecular players. Beyond homosynaptic modifications, synapses can also interact with one another. This is encapsulated in the synaptic tagging and capture hypothesis (STC), where synapses expressing early-LTP/LTD present a 'tag' that can capture the protein synthesis products generated during a temporally proximal late-LTP/LTD induction. This 'tagging' phenomenon forms the framework of synaptic interactions in various conditions and accounts for the cellular basis of the time-dependent associativity of short-lasting and long-lasting memories. All these synaptic modifications take place under controlled neuronal conditions, regulated by subcellular elements such as epigenetic regulation, proteasomal degradation and neuromodulatory signals. Here, we review current understanding of the different forms of synaptic plasticity and its regulatory mechanisms in the hippocampus, a brain region critical for memory formation. We also discuss expression of plasticity in hippocampal CA2 area, a long-overlooked narrow hippocampal subfield and the behavioural correlate of STC. Lastly, we put forth perspectives for an integrated view of memory representation in synapses.
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Affiliation(s)
- Mohammad Zaki Bin Ibrahim
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Life Sciences Institute Neurobiology Programme, National University of Singapore, Singapore
| | - Amrita Benoy
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Life Sciences Institute Neurobiology Programme, National University of Singapore, Singapore
| | - Sreedharan Sajikumar
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Life Sciences Institute Neurobiology Programme, National University of Singapore, Singapore.,Healthy Longevity Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
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10
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Histone deacetylase 3 in hippocampus contributes to memory impairment after chronic constriction injury of sciatic nerve in mice. Pain 2021; 162:382-395. [PMID: 32868749 DOI: 10.1097/j.pain.0000000000002056] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Accepted: 08/14/2020] [Indexed: 02/06/2023]
Abstract
ABSTRACT Chronic neuropathic pain is frequently accompanied by memory impairment, yet the underlying mechanisms remain unclear. Here, we showed that mice displayed memory impairment starting at 14 days and lasting for at least 21 days after chronic constriction injury (CCI) of unilateral sciatic nerve in mice. Systemic administration of the pan histone deacetylase (HDAC) inhibitor sodium butyrate attenuated this memory impairment. More specifically, we found that hippocampus HDAC3 was involved in this process because the levels of its mRNA and protein increased significantly in the hippocampus at 14 and 21 days after CCI, but not sham surgery. Systemic administration of the selective HDAC3 antagonist RGFP966 attenuated CCI-induced memory impairment, improved hippocampal long-term potentiation impairment, and rescued reductions of dendritic spine density and synaptic plasticity-associated protein in the hippocampus. In addition, HDAC3 overexpression in the hippocampus led to memory impairment without affecting basal nociceptive responses in naive mice. Our findings suggest that HDAC3 contributes to memory impairment after CCI by impairing synaptic plasticity in hippocampus. Histone deacetylase 3 might serve as a potential molecular target for therapeutic treatment of memory impairment under neuropathic pain conditions.
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11
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Wong L, Chong YS, Lin W, Kisiswa L, Sim E, Ibáñez CF, Sajikumar S. Age-related changes in hippocampal-dependent synaptic plasticity and memory mediated by p75 neurotrophin receptor. Aging Cell 2021; 20:e13305. [PMID: 33448137 PMCID: PMC7884039 DOI: 10.1111/acel.13305] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 11/25/2020] [Accepted: 12/23/2020] [Indexed: 12/16/2022] Open
Abstract
The plasticity mechanisms in the nervous system that are important for learning and memory are greatly impacted during aging. Notably, hippocampal-dependent long-term plasticity and its associative plasticity, such as synaptic tagging and capture (STC), show considerable age-related decline. The p75 neurotrophin receptor (p75NTR ) is a negative regulator of structural and functional plasticity in the brain and thus represents a potential candidate to mediate age-related alterations. However, the mechanisms by which p75NTR affects synaptic plasticity of aged neuronal networks and ultimately contribute to deficits in cognitive function have not been well characterized. Here, we report that mutant mice lacking the p75NTR were resistant to age-associated changes in long-term plasticity, associative plasticity, and associative memory. Our study shows that p75NTR is responsible for age-dependent disruption of hippocampal homeostatic plasticity by modulating several signaling pathways, including BDNF, MAPK, Arc, and RhoA-ROCK2-LIMK1-cofilin. p75NTR may thus represent an important therapeutic target for limiting the age-related memory and cognitive function deficits.
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Affiliation(s)
- Lik‐Wei Wong
- Department of PhysiologyNational University of SingaporeSingapore CitySingapore
- Life Sciences Institute Neurobiology ProgrammeNational University of SingaporeSingapore CitySingapore
- Healthy Longevity Translational Research ProgrammeYong Loo Lin School of MedicineNational University of SingaporeSingapore CitySingapore
| | - Yee Song Chong
- Department of PhysiologyNational University of SingaporeSingapore CitySingapore
- Life Sciences Institute Neurobiology ProgrammeNational University of SingaporeSingapore CitySingapore
| | - Wei Lin
- Department of PhysiologyNational University of SingaporeSingapore CitySingapore
- Life Sciences Institute Neurobiology ProgrammeNational University of SingaporeSingapore CitySingapore
| | - Lilian Kisiswa
- Department of PhysiologyNational University of SingaporeSingapore CitySingapore
- Life Sciences Institute Neurobiology ProgrammeNational University of SingaporeSingapore CitySingapore
| | - Eunice Sim
- Department of PhysiologyNational University of SingaporeSingapore CitySingapore
- Life Sciences Institute Neurobiology ProgrammeNational University of SingaporeSingapore CitySingapore
| | - Carlos F. Ibáñez
- Department of PhysiologyNational University of SingaporeSingapore CitySingapore
- Life Sciences Institute Neurobiology ProgrammeNational University of SingaporeSingapore CitySingapore
- Department of NeuroscienceKarolinska InstituteStockholmSweden
| | - Sreedharan Sajikumar
- Department of PhysiologyNational University of SingaporeSingapore CitySingapore
- Life Sciences Institute Neurobiology ProgrammeNational University of SingaporeSingapore CitySingapore
- Healthy Longevity Translational Research ProgrammeYong Loo Lin School of MedicineNational University of SingaporeSingapore CitySingapore
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12
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Chao B, Zhang L, Pan J, Zhang Y, Chen Y, Xu M, Huang S. Stanniocalcin-1 Overexpression Prevents Depression-Like Behaviors Through Inhibition of the ROS/NF-κB Signaling Pathway. Front Psychiatry 2021; 12:644383. [PMID: 34194345 PMCID: PMC8238083 DOI: 10.3389/fpsyt.2021.644383] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Accepted: 04/26/2021] [Indexed: 01/29/2023] Open
Abstract
Background: Depression is a burdensome psychiatric disorder presenting with disordered inflammation and neural plasticity. We conducted this study with an aim to explore the effect of stanniocalcin-1 (STC1) on inflammation and neuron injury in rats with depression-like behaviors. Methods: A model of depression-like behaviors was established in Wistar rats by stress stimulation. Adeno-associated virus (AAV)-packaged STC1 overexpression sequence or siRNA against STC1 was introduced into rats to enhance or silence the STC1 expression. Moreover, we measured pro-inflammatory and anti-inflammatory proteins, superoxide dismutase (SOD), catalase (CAT), malondialdehyde (MDA) and reactive oxygen species (ROS) production. An in vitro model was induced in hippocampal neurons by CORT to explore the effect of STC1 on the neuron viability, toxicity and apoptosis. RT-qPCR and Western blot assay were employed to determine the expression of STC1 and nuclear factor κB (NF-κB) signaling pathway-related genes. Results: STC1 was under-expressed in the hippocampus of rats with depression-like behaviors, while its overexpression could reduce the depression-like behaviors in the stress-stimulated rats. Furthermore, overexpression of STC1 resulted in enhanced neural plasticity, reduced release of pro-inflammatory proteins, elevated SOD and CAT and diminished MDA level in the hippocampus of rats with depression-like behaviors. Overexpressed STC1 blocked the ROS/NF-κB signaling pathway, thereby enhancing the viability of CORT-treated neurons while repressing their toxicity and apoptosis. Conclusion: Collectively, overexpression of STC1 inhibits inflammation and protects neuron injury in rats with depression-like behaviors by inactivating the ROS/NF-κB signaling pathway.
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Affiliation(s)
- Bin Chao
- Traditional Chinese Medicine Research and Development Center, Guang'anmen Hospital, China Academy of Chinese Medicine, Beijing, China
| | - Lili Zhang
- Department of Endocrinology, Guang'anmen Hospital, China Academy of Chinese Medicine, Beijing, China
| | - Juhua Pan
- Traditional Chinese Medicine Research and Development Center, Guang'anmen Hospital, China Academy of Chinese Medicine, Beijing, China
| | - Ying Zhang
- Traditional Chinese Medicine Research and Development Center, Guang'anmen Hospital, China Academy of Chinese Medicine, Beijing, China
| | - Yuxia Chen
- Traditional Chinese Medicine Research and Development Center, Guang'anmen Hospital, China Academy of Chinese Medicine, Beijing, China
| | - Manman Xu
- Traditional Chinese Medicine Research and Development Center, Guang'anmen Hospital, China Academy of Chinese Medicine, Beijing, China
| | - Shijing Huang
- Traditional Chinese Medicine Research and Development Center, Guang'anmen Hospital, China Academy of Chinese Medicine, Beijing, China
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13
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Smolen P, Wood MA, Baxter DA, Byrne JH. Modeling suggests combined-drug treatments for disorders impairing synaptic plasticity via shared signaling pathways. J Comput Neurosci 2020; 49:37-56. [PMID: 33175283 DOI: 10.1007/s10827-020-00771-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 08/27/2020] [Accepted: 10/19/2020] [Indexed: 12/15/2022]
Abstract
Genetic disorders such as Rubinstein-Taybi syndrome (RTS) and Coffin-Lowry syndrome (CLS) cause lifelong cognitive disability, including deficits in learning and memory. Can pharmacological therapies be suggested that improve learning and memory in these disorders? To address this question, we simulated drug effects within a computational model describing induction of late long-term potentiation (L-LTP). Biochemical pathways impaired in these and other disorders converge on a common target, histone acetylation by acetyltransferases such as CREB binding protein (CBP), which facilitates gene induction necessary for L-LTP. We focused on four drug classes: tropomyosin receptor kinase B (TrkB) agonists, cAMP phosphodiesterase inhibitors, histone deacetylase inhibitors, and ampakines. Simulations suggested each drug type alone may rescue deficits in L-LTP. A potential disadvantage, however, was the necessity of simulating strong drug effects (high doses), which could produce adverse side effects. Thus, we investigated the effects of six drug pairs among the four classes described above. These combination treatments normalized impaired L-LTP with substantially smaller individual drug 'doses'. In addition three of these combinations, a TrkB agonist paired with an ampakine and a cAMP phosphodiesterase inhibitor paired with a TrkB agonist or an ampakine, exhibited strong synergism in L-LTP rescue. Therefore, we suggest these drug combinations are promising candidates for further empirical studies in animal models of genetic disorders that impair histone acetylation, L-LTP, and learning.
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Affiliation(s)
- Paul Smolen
- Department of Neurobiology and Anatomy, W.M. Keck Center for the Neurobiology of Learning and Memory, McGovern Medical School of the University of Texas Health Science Center at Houston, Houston, TX, 77030, USA.
| | - Marcelo A Wood
- Department of Neurobiology and Behavior, University of California Irvine, Irvine, CA, 92697, USA
| | - Douglas A Baxter
- Department of Neurobiology and Anatomy, W.M. Keck Center for the Neurobiology of Learning and Memory, McGovern Medical School of the University of Texas Health Science Center at Houston, Houston, TX, 77030, USA
| | - John H Byrne
- Department of Neurobiology and Anatomy, W.M. Keck Center for the Neurobiology of Learning and Memory, McGovern Medical School of the University of Texas Health Science Center at Houston, Houston, TX, 77030, USA
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14
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Krishna-K K, Baby N, Raghuraman R, Navakkode S, Behnisch T, Sajikumar S. Regulation of aberrant proteasome activity re-establishes plasticity and long-term memory in an animal model of Alzheimer's disease. FASEB J 2020; 34:9466-9479. [PMID: 32459037 DOI: 10.1096/fj.201902844rr] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2019] [Revised: 04/17/2020] [Accepted: 05/05/2020] [Indexed: 11/11/2022]
Abstract
Reduced retrograde memory performance at the cognitive level and aggregation/deposition of amyloid beta (Aβ) in the brain at the cellular level are some of the hallmarks of Alzheimer's Disease (AD). A molecular system that participates in the removal of proteins with an altered conformation is the Ubiquitin-Proteasome System (UPS). Impairments of the UPS in wild-type (WT) mice lead to defective clearance of Aβ and prevent long-term plasticity of synaptic transmission. Here we show data whereby in contrast to WT mice, the inhibition of proteasome-mediated protein degradation in an animal model of AD by MG132 or lactacystin restores impaired activity-dependent synaptic plasticity and its associative interaction, synaptic tagging and capture (STC) in vitro, as well as associative long-term memory in vivo. This augmentation of synaptic plasticity and memory is mediated by the mTOR pathway and protein synthesis. Our data offer novel insights into the rebalancing of proteins relevant for synaptic plasticity which are regulated by UPS in AD-like animal models. In addition, the data provide evidence that proteasome inhibitors might be effective in reinstating synaptic plasticity and memory performance in AD, and therefore offer a new potential therapeutic option for AD treatment.
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Affiliation(s)
- Kumar Krishna-K
- Department of Physiology, National University of Singapore, Singapore, Singapore.,Life Sciences Institute Neurobiology Programme, National University of Singapore, Singapore, Singapore
| | - Nimmi Baby
- Department of Physiology, National University of Singapore, Singapore, Singapore.,Life Sciences Institute Neurobiology Programme, National University of Singapore, Singapore, Singapore
| | - Radha Raghuraman
- Department of Physiology, National University of Singapore, Singapore, Singapore.,Life Sciences Institute Neurobiology Programme, National University of Singapore, Singapore, Singapore
| | - Sheeja Navakkode
- Department of Physiology, National University of Singapore, Singapore, Singapore.,Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - Thomas Behnisch
- Institutes of Brain Science, State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Fudan University, Shanghai, China
| | - Sreedharan Sajikumar
- Department of Physiology, National University of Singapore, Singapore, Singapore.,Life Sciences Institute Neurobiology Programme, National University of Singapore, Singapore, Singapore
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15
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Early sirtuin 2 inhibition prevents age-related cognitive decline in a senescence-accelerated mouse model. Neuropsychopharmacology 2020; 45:347-357. [PMID: 31471557 PMCID: PMC6901465 DOI: 10.1038/s41386-019-0503-8] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 08/02/2019] [Accepted: 08/22/2019] [Indexed: 02/07/2023]
Abstract
The senescence-accelerated mouse prone-8 (SAMP8) model has been considered as a good model for aged-related cognitive decline and Alzheimer's disease (AD). Since epigenetic alterations represent a crucial mechanism during aging, in the present study we tested whether the inhibition of the histone deacetylase sirtuin 2 (SIRT2) could ameliorate the age-dependent cognitive impairments and associated neuropathology shown by SAMP8 mice. To this end, the potent SIRT2-selective inhibitor, 33i (5 mg/kg i.p. 8 weeks) was administered to 5-month-old (early treatment) and 8-month-old (late treatment) SAMP8 and aged matched control, senescence-accelerated mouse resistant-1 (SAMR1) mice. 33i administration to 5-month-old SAMP8 mice improved spatial learning and memory impairments shown by this strain in the Morris water maze. SAMP8 showed hyperphosphorylation of tau protein and decrease levels of SIRT1 in the hippocampus, which were not altered by 33i treatment. However, this treatment upregulated the glutamate receptor subunits GluN2A, GluN2B, and GluA1 in both SAMR1 and SAMP8. Moreover, early SIRT2 inhibition prevented neuroinflammation evidenced by reduced levels of GFAP, IL-1β, Il-6, and Tnf-α, providing a plausible explanation for the improvement of cognitive deficits shown by 33i-treated SAMP8 mice. When 33i was administered to 8-month-old SAMP8 with a severe established pathology, increases in GluN2A, GluN2B, and GluA1 were observed; however, it was not able to reverse the cognitive decline or the neuroinflammation. These results suggest that early SIRT2 inhibition might be beneficial in preventing age-related cognitive deficits, neuroinflammation, and AD progression and could be an emerging candidate for the treatment of other diseases linked to dementia.
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16
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Baby N, Alagappan N, Dheen ST, Sajikumar S. MicroRNA-134-5p inhibition rescues long-term plasticity and synaptic tagging/capture in an Aβ(1-42)-induced model of Alzheimer's disease. Aging Cell 2020; 19:e13046. [PMID: 31625272 PMCID: PMC6974725 DOI: 10.1111/acel.13046] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 07/31/2019] [Accepted: 08/28/2019] [Indexed: 12/21/2022] Open
Abstract
Progressive memory loss is one of the most common characteristics of Alzheimer's disease (AD), which has been shown to be caused by several factors including accumulation of amyloid β peptide (Aβ) plaques and neurofibrillary tangles. Synaptic plasticity and associative plasticity, the cellular basis of memory, are impaired in AD. Recent studies suggest a functional relevance of microRNAs (miRNAs) in regulating plasticity changes in AD, as their differential expressions were reported in many AD brain regions. However, the specific role of these miRNAs in AD has not been elucidated. We have reported earlier that late long-term potentiation (late LTP) and its associative mechanisms such as synaptic tagging and capture (STC) were impaired in Aβ (1-42)-induced AD condition. This study demonstrates that expression of miR-134-5p, a brain-specific miRNA is upregulated in Aβ (1-42)-treated AD hippocampus. Interestingly, the loss of function of miR-134-5p restored late LTP and STC in AD. In AD brains, inhibition of miR-134-5p elevated the expression of plasticity-related proteins (PRPs), cAMP-response-element binding protein (CREB-1) and brain-derived neurotrophic factor (BDNF), which are otherwise downregulated in AD condition. The results provide the first evidence that the miR-134-mediated post-transcriptional regulation of CREB-1 and BDNF is an important molecular mechanism underlying the plasticity deficit in AD; thus demonstrating the critical role of miR-134-5p as a potential therapeutic target for restoring plasticity in AD condition.
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Affiliation(s)
- Nimmi Baby
- Department of PhysiologyYong Loo Lin School of MedicineNational University Health SystemNational University of SingaporeSingapore
- Centre for Life SciencesLife Sciences Institute, Neurobiology ProgrammeNational University of SingaporeSingapore
| | - Nithyakalyani Alagappan
- Department of PhysiologyYong Loo Lin School of MedicineNational University Health SystemNational University of SingaporeSingapore
- Centre for Life SciencesLife Sciences Institute, Neurobiology ProgrammeNational University of SingaporeSingapore
| | - Shaikali Thameem Dheen
- Department of AnatomyYong Loo Lin School of MedicineNational University Health SystemNational University of SingaporeSingapore
| | - Sreedharan Sajikumar
- Department of PhysiologyYong Loo Lin School of MedicineNational University Health SystemNational University of SingaporeSingapore
- Centre for Life SciencesLife Sciences Institute, Neurobiology ProgrammeNational University of SingaporeSingapore
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17
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Environmental enrichment prevents Aβ oligomer-induced synaptic dysfunction through mirna-132 and hdac3 signaling pathways. Neurobiol Dis 2019; 134:104617. [PMID: 31669733 DOI: 10.1016/j.nbd.2019.104617] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 09/04/2019] [Accepted: 09/17/2019] [Indexed: 12/21/2022] Open
Abstract
As the most common cause of progressive cognitive decline in humans, Alzheimer's disease (AD) has been intensively studied, but the mechanisms underlying its profound synaptic dysfunction remain unclear. Here we confirm that exposing wild-type mice to an enriched environment (EE) facilitates signaling in the hippocampus that promotes long-term potentiation (LTP). Exposing the hippocampus of mice kept in standard housing to soluble Aβ oligomers impairs LTP, but EE can fully prevent this. Mechanistically, the key molecular features of the EE benefit are an upregulation of miRNA-132 and an inhibition of histone deacetylase (HDAC) signaling. Specifically, soluble Aβ oligomers decreased miR-132 expression and increased HDAC3 levels in cultured primary neurons. Further, we provide evidence that HDAC3 is a direct target of miR-132. Overexpressing miR-132 or injecting an HDAC3 inhibitor into mice in standard housing mimics the benefits of EE in enhancing hippocampal LTP and preventing hippocampal impairment by Aβ oligomers in vivo. We conclude that EE enhances hippocampal synaptic plasticity by upregulating miRNA-132 and reducing HDAC3 signaling in a way that counteracts the synaptotoxicity of human Aβ oligomers. Our findings provide a rationale for prolonged exposure to cognitive novelty and/or epigenetic modulation to lessen the progressive effects of Aβ accumulation during human brain aging.
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18
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HDAC3-Mediated Repression of the Nr4a Family Contributes to Age-Related Impairments in Long-Term Memory. J Neurosci 2019; 39:4999-5009. [PMID: 31000586 DOI: 10.1523/jneurosci.2799-18.2019] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 03/27/2019] [Accepted: 04/14/2019] [Indexed: 02/06/2023] Open
Abstract
Aging is accompanied by cognitive deficits, including impairments in long-term memory formation. Understanding the molecular mechanisms that support preserved cognitive function in aged animals is a critical step toward identifying novel therapeutic targets that could improve memory in aging individuals. One potential mechanism is the Nr4a family of genes, a group of CREB-dependent nuclear orphan receptors that have previously been shown to be important for hippocampal memory formation. Here, using a cross-species approach, we tested the role of Nr4a1 and Nr4a2 in age-related memory impairments. Using a rat model designed to identify individual differences in age-related memory impairments, we first identified Nr4a2 as a key gene that fails to be induced by learning in cognitively impaired male aged rats. Next, using a mouse model that allows for genetic manipulations, we determined that histone deacetylase 3 (HDAC3) negatively regulates Nr4a2 in the aged male and female hippocampus. Finally, we show that overexpression of Nr4a1, Nr4a2, or both transcripts in the male mouse dorsal hippocampus can ameliorate age-related impairments in object location memory. Together, our results suggest that Nr4a2 may be a key mechanism that promotes preserved cognitive function in old age, with HDAC3-mediated repression of Nr4a2 contributing to age-related cognitive decline. More broadly, these results indicate that therapeutic strategies to promote Nr4a gene expression or function may be an effective strategy to improve cognitive function in old age.SIGNIFICANCE STATEMENT Aging is accompanied by memory impairments, although there is a great deal of variability in the severity of these impairments. Identifying molecular mechanisms that promote preserved memory or participate in cognitive reserve in old age is important to develop strategies that promote healthy cognitive aging. Here, we show that learning-induced expression of the CREB-regulated nuclear receptor gene Nr4a2 is selectively impaired in aged rats with memory impairments. Further, we show that Nr4a2 is regulated by histone deacetylase HDAC3 in the aged mouse hippocampus. Finally, we demonstrate that hippocampal overexpression of either Nr4a2 or its family member, Nr4a1, can ameliorate age-related memory impairments. This suggests that promoting Nr4a expression may be a novel strategy to improve memory in aging individuals.
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19
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Brandwein NJ, Nguyen PV. A requirement for epigenetic modifications during noradrenergic stabilization of heterosynaptic LTP in the hippocampus. Neurobiol Learn Mem 2019; 161:72-82. [PMID: 30930287 DOI: 10.1016/j.nlm.2019.03.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2019] [Revised: 03/22/2019] [Accepted: 03/27/2019] [Indexed: 12/31/2022]
Abstract
Beta-adrenergic receptor (b-AR) activation by noradrenaline (NA) enhances memory formation and long-term potentiation (LTP), a form of synaptic plasticity characterized by an activity-dependent increase in synaptic strength. LTP is believed to be a cellular mechanism for contextual learning and memory. In the mammalian hippocampus, LTP can be observed at multiple synaptic pathways after strong stimulation of a single synaptic pathway. This heterosynaptic LTP is believed to involve synaptic tagging of active synapses and capture of plasticity-related proteins that enable heterosynaptic transfer of persistent potentiation. These processes may permit distinct neural pathways to associate information transmitted by separate, but convergent, synaptic inputs. We had previously shown that transcription and epigenetic modifications were necessary for stabilization of homosynaptic LTP. However, it is unclear whether transfer of LTP to a second, heterosynaptic pathway involves b-ARs signalling to the nucleus. Using electrophysiologic recordings in area CA1 of murine hippocampal slices, we show here that pharmacologically inhibiting b-AR activation, transcription, DNA methyltransferase or histone acetyltransferase activation, prevents stabilization of heterosynaptic LTP. Our data suggest that noradrenergic stabilization of heterosynaptic ("tagged") LTP requires not only transcription, but specifically, DNA methylation and histone acetylation. NA promotes stable heterosynaptic plasticity through engagement of nuclear processes that may contribute to prompt consolidation of short-term memories into resilient long-term memories under conditions when the brain's noradrenergic system is recruited.
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Affiliation(s)
- N J Brandwein
- Department of Physiology, University of Alberta School of Medicine, Edmonton, Alberta T6G 2H7, Canada
| | - P V Nguyen
- Department of Physiology, University of Alberta School of Medicine, Edmonton, Alberta T6G 2H7, Canada.
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20
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Abstract
In the past few decades, the field of neuroepigenetics has investigated how the brain encodes information to form long-lasting memories that lead to stable changes in behaviour. Activity-dependent molecular mechanisms, including, but not limited to, histone modification, DNA methylation and nucleosome remodelling, dynamically regulate the gene expression required for memory formation. Recently, the field has begun to examine how a learning experience is integrated at the level of both chromatin structure and synaptic physiology. Here, we provide an overview of key established epigenetic mechanisms that are important for memory formation. We explore how epigenetic mechanisms give rise to stable alterations in neuronal function by modifying synaptic structure and function, and highlight studies that demonstrate how manipulating epigenetic mechanisms may push the boundaries of memory.
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Affiliation(s)
- Rianne R Campbell
- Department of Neurobiology and Behavior, Center for the Neurobiology of Learning and Memory, Center for Addiction Neuroscience, Institute for Memory Impairments and Neurological Disorders, University of California, Irvine, CA, USA
| | - Marcelo A Wood
- Department of Neurobiology and Behavior, Center for the Neurobiology of Learning and Memory, Center for Addiction Neuroscience, Institute for Memory Impairments and Neurological Disorders, University of California, Irvine, CA, USA.
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21
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Yu L, Liu Y, Jin Y, Cao X, Chen J, Jin J, Gu Y, Bao X, Ren Z, Xu Y, Zhu X. Lentivirus-Mediated HDAC3 Inhibition Attenuates Oxidative Stress in APPswe/PS1dE9 Mice. J Alzheimers Dis 2019; 61:1411-1424. [PMID: 29376873 DOI: 10.3233/jad-170844] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Amyloid-β (Aβ) induces a burst of oxidative stress and plays a critical role in the pathogenesis of Alzheimer's disease (AD). Our previous results have shown that histone deacetylase 3 (HDAC3) inhibition ameliorates spatial memory deficits and decreases the Aβ burden in the brains of 9-month-old APPswe/PS1dE9 (APP/PS1) mice. In this study, we investigated the role of HDAC3 inhibition in oxidative stress in vivo and in vitro models of AD. HDAC3 was detected mainly in the neurons, and HDAC3 inhibition significantly decreased reactive oxygen species generation and improved primary cortical neuron viability. In addition, HDAC3 inhibition attenuated spatial memory dysfunction in 6-month-old APP/PS1 mice, and decreased the apoptotic rate in the hippocampi as demonstrated by TUNEL staining. HDAC3 inhibition also reduced markers of lipid peroxidation, protein oxidation, and DNA/RNA oxidation in the hippocampi of APP/PS1 mice. Moreover, HDAC3 inhibition inactivated the c-Abl/MST1/YAP signaling pathway in the hippocampi of APP/PS1 mice. In conclusion, our data show that HDAC3 inhibition can attenuate spatial memory deficits and inhibit oxidative stress in APP/PS1 mice; these results indicate a potential strategy for AD treatment.
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Affiliation(s)
- Linjie Yu
- Department of Neurology, Drum Tower Hospital, Medical School of Nanjing University, Nanjing, China.,The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China.,Nanjing, Jiangsu Key Laboratory for Molecular Medicine, Nanjing, China
| | - Yi Liu
- Department of Neurology, Drum Tower Hospital, Medical School of Nanjing University, Nanjing, China.,The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China.,Nanjing, Jiangsu Key Laboratory for Molecular Medicine, Nanjing, China
| | - Yuexinzi Jin
- Department of Neurology, Drum Tower Hospital, Medical School of Nanjing University, Nanjing, China.,Nanjing, Jiangsu Key Laboratory for Molecular Medicine, Nanjing, China.,Department of Neurology, Drum Tower Hospital of Nanjing Medical University, Nanjing, China
| | - Xiang Cao
- Department of Neurology, Drum Tower Hospital, Medical School of Nanjing University, Nanjing, China.,The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China.,Nanjing, Jiangsu Key Laboratory for Molecular Medicine, Nanjing, China
| | - Jian Chen
- Department of Neurology, Drum Tower Hospital, Medical School of Nanjing University, Nanjing, China.,Nanjing, Jiangsu Key Laboratory for Molecular Medicine, Nanjing, China.,Department of Neurology, Drum Tower Hospital of Nanjing Medical University, Nanjing, China
| | - Jiali Jin
- Department of Neurology, Drum Tower Hospital, Medical School of Nanjing University, Nanjing, China.,The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China.,Nanjing, Jiangsu Key Laboratory for Molecular Medicine, Nanjing, China
| | - Yue Gu
- Department of Neurology, Drum Tower Hospital, Medical School of Nanjing University, Nanjing, China.,The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China.,Nanjing, Jiangsu Key Laboratory for Molecular Medicine, Nanjing, China
| | - Xinyu Bao
- Department of Neurology, Drum Tower Hospital, Medical School of Nanjing University, Nanjing, China.,The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China.,Nanjing, Jiangsu Key Laboratory for Molecular Medicine, Nanjing, China
| | - Zhuoying Ren
- Department of Neurology, Drum Tower Hospital, Medical School of Nanjing University, Nanjing, China.,The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China.,Nanjing, Jiangsu Key Laboratory for Molecular Medicine, Nanjing, China
| | - Yun Xu
- Department of Neurology, Drum Tower Hospital, Medical School of Nanjing University, Nanjing, China.,The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China.,Nanjing, Jiangsu Key Laboratory for Molecular Medicine, Nanjing, China
| | - Xiaolei Zhu
- Department of Neurology, Drum Tower Hospital, Medical School of Nanjing University, Nanjing, China.,The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, China.,Nanjing, Jiangsu Key Laboratory for Molecular Medicine, Nanjing, China
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22
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Sartor GC, Malvezzi AM, Kumar A, Andrade NS, Wiedner HJ, Vilca SJ, Janczura KJ, Bagheri A, Al-Ali H, Powell SK, Brown PT, Volmar CH, Foster TC, Zeier Z, Wahlestedt C. Enhancement of BDNF Expression and Memory by HDAC Inhibition Requires BET Bromodomain Reader Proteins. J Neurosci 2019; 39:612-626. [PMID: 30504275 PMCID: PMC6343644 DOI: 10.1523/jneurosci.1604-18.2018] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 10/05/2018] [Accepted: 11/11/2018] [Indexed: 02/01/2023] Open
Abstract
Histone deacetylase (HDAC) inhibitors may have therapeutic utility in multiple neurological and psychiatric disorders, but the underlying mechanisms remain unclear. Here, we identify BRD4, a BET bromodomain reader of acetyl-lysine histones, as an essential component involved in potentiated expression of brain-derived neurotrophic factor (BDNF) and memory following HDAC inhibition. In in vitro studies, we reveal that pharmacological inhibition of BRD4 reversed the increase in BDNF mRNA induced by the class I/IIb HDAC inhibitor suberoylanilide hydroxamic acid (SAHA). Knock-down of HDAC2 and HDAC3, but not other HDACs, increased BDNF mRNA expression, whereas knock-down of BRD4 blocked these effects. Using dCas9-BRD4, locus-specific targeting of BRD4 to the BDNF promoter increased BDNF mRNA. In additional studies, RGFP966, a pharmacological inhibitor of HDAC3, elevated BDNF expression and BRD4 binding to the BDNF promoter, effects that were abrogated by JQ1 (an inhibitor of BRD4). Examining known epigenetic targets of BRD4 and HDAC3, we show that H4K5ac and H4K8ac modifications and H4K5ac enrichment at the BDNF promoter were elevated following RGFP966 treatment. In electrophysiological studies, JQ1 reversed RGFP966-induced enhancement of LTP in hippocampal slice preparations. Last, in behavioral studies, RGFP966 increased subthreshold novel object recognition memory and cocaine place preference in male C57BL/6 mice, effects that were reversed by cotreatment with JQ1. Together, these data reveal that BRD4 plays a key role in HDAC3 inhibitor-induced potentiation of BDNF expression, neuroplasticity, and memory.SIGNIFICANCE STATEMENT Some histone deacetylase (HDAC) inhibitors are known to have neuroprotective and cognition-enhancing properties, but the underlying mechanisms have yet to be fully elucidated. In the current study, we reveal that BRD4, an epigenetic reader of histone acetylation marks, is necessary for enhancing brain-derived neurotrophic factor (BDNF) expression and improved memory following HDAC inhibition. Therefore, by identifying novel epigenetic regulators of BDNF expression, these data may lead to new therapeutic targets for the treatment of neuropsychiatric disorders.
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Affiliation(s)
- Gregory C Sartor
- Center for Therapeutic Innovation and Department of Psychiatry and Behavioral Sciences, Miller School of Medicine, University of Miami, Miami, Florida 33136,
- Department of Pharmaceutical Sciences, University of Connecticut, Storrs, Connecticut 06269
| | - Andrea M Malvezzi
- Center for Therapeutic Innovation and Department of Psychiatry and Behavioral Sciences, Miller School of Medicine, University of Miami, Miami, Florida 33136
| | - Ashok Kumar
- Departments of Neuroscience and Genetics and Genomics Program, Evelyn F. and William L. McKnight Brain Institute, University of Florida, Gainesville, Florida 32611, and
| | - Nadja S Andrade
- Center for Therapeutic Innovation and Department of Psychiatry and Behavioral Sciences, Miller School of Medicine, University of Miami, Miami, Florida 33136
| | - Hannah J Wiedner
- Center for Therapeutic Innovation and Department of Psychiatry and Behavioral Sciences, Miller School of Medicine, University of Miami, Miami, Florida 33136
| | - Samantha J Vilca
- Center for Therapeutic Innovation and Department of Psychiatry and Behavioral Sciences, Miller School of Medicine, University of Miami, Miami, Florida 33136
| | - Karolina J Janczura
- Center for Therapeutic Innovation and Department of Psychiatry and Behavioral Sciences, Miller School of Medicine, University of Miami, Miami, Florida 33136
| | - Amir Bagheri
- Center for Therapeutic Innovation and Department of Psychiatry and Behavioral Sciences, Miller School of Medicine, University of Miami, Miami, Florida 33136
| | - Hassan Al-Ali
- Miami Project to Cure Paralysis, Miller School of Medicine, University of Miami, Miami, Florida 33136
| | - Samuel K Powell
- Center for Therapeutic Innovation and Department of Psychiatry and Behavioral Sciences, Miller School of Medicine, University of Miami, Miami, Florida 33136
| | - Peyton T Brown
- Center for Therapeutic Innovation and Department of Psychiatry and Behavioral Sciences, Miller School of Medicine, University of Miami, Miami, Florida 33136
| | - Claude H Volmar
- Center for Therapeutic Innovation and Department of Psychiatry and Behavioral Sciences, Miller School of Medicine, University of Miami, Miami, Florida 33136
| | - Thomas C Foster
- Departments of Neuroscience and Genetics and Genomics Program, Evelyn F. and William L. McKnight Brain Institute, University of Florida, Gainesville, Florida 32611, and
| | - Zane Zeier
- Center for Therapeutic Innovation and Department of Psychiatry and Behavioral Sciences, Miller School of Medicine, University of Miami, Miami, Florida 33136
| | - Claes Wahlestedt
- Center for Therapeutic Innovation and Department of Psychiatry and Behavioral Sciences, Miller School of Medicine, University of Miami, Miami, Florida 33136,
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Epigenetic regulation of the circadian gene Per1 contributes to age-related changes in hippocampal memory. Nat Commun 2018; 9:3323. [PMID: 30127461 PMCID: PMC6102273 DOI: 10.1038/s41467-018-05868-0] [Citation(s) in RCA: 93] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Accepted: 07/27/2018] [Indexed: 01/13/2023] Open
Abstract
Aging is accompanied by impairments in both circadian rhythmicity and long-term memory. Although it is clear that memory performance is affected by circadian cycling, it is unknown whether age-related disruption of the circadian clock causes impaired hippocampal memory. Here, we show that the repressive histone deacetylase HDAC3 restricts long-term memory, synaptic plasticity, and experience-induced expression of the circadian gene Per1 in the aging hippocampus without affecting rhythmic circadian activity patterns. We also demonstrate that hippocampal Per1 is critical for long-term memory formation. Together, our data challenge the traditional idea that alterations in the core circadian clock drive circadian-related changes in memory formation and instead argue for a more autonomous role for circadian clock gene function in hippocampal cells to gate the likelihood of long-term memory formation. Circadian rhythms are known to modulate memory, but it’s not known whether clock genes in the hippocampus are required for memory consolidation. Here, the authors show that epigenetic regulation of clock gene Period1 in the hippocampus regulates memory and contributes to age-related memory decline, independent of circadian rhythms.
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Loss of Synaptic Tagging in the Anterior Cingulate Cortex after Tail Amputation in Adult Mice. J Neurosci 2018; 38:8060-8070. [PMID: 30054392 DOI: 10.1523/jneurosci.0444-18.2018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Revised: 07/21/2018] [Accepted: 07/24/2018] [Indexed: 01/16/2023] Open
Abstract
Anterior cingulate cortex (ACC) is known to play important roles in key brain functions such as pain perception, cognition, and emotion. Different forms of homosynaptic plasticity such as long-term potentiation (LTP) and long-term depression have been studied in ACC synapses. However, heterosynaptic plasticity such as synaptic tagging has not been reported. Here, we demonstrate synaptic tagging in the ACC of adult male mice by using a 64-channel multielectrode array recording system. Weak theta burst stimulation (TBS), normally inducing early-phase LTP or No-LTP in most of the activated channels, produced late phase-LTP (L-LTP) in a majority of channels when a strong TBS was applied earlier to a separate input within a certain time window. Similar to hippocampus, synaptic tagging in the ACC depends on the synthesis of new proteins. Tail amputation-induced peripheral injury caused a loss of this heterosynaptic L-LTP and occluded strong TBS-evoked L-LTP as well. Together, we provide the first report of the synaptic tagging-like phenomenon in the ACC of adult mice, and the loss of synaptic tagging to amputation may contribute to injury-related cognitive changes and phantom limb sensation and pain.SIGNIFICANCE STATEMENT ACC is an important cortical region involved in many brain functions. Previous studies have dissected the molecular mechanism of multiple types of homosynaptic plasticity of ACC synapses. Here, we report a novel form of heterosynaptic plasticity occurring in the ACC. This newly identified, protein synthesis-dependent neocortical synaptic tagging is sensitive to peripheral tail amputation injury and may provide basic mechanisms for synaptic pathophysiology of phantom pain and related cognitive changes.
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Gros A, Wang SH. Behavioral tagging and capture: long-term memory decline in middle-aged rats. Neurobiol Aging 2018; 67:31-41. [PMID: 29609080 PMCID: PMC5964067 DOI: 10.1016/j.neurobiolaging.2018.02.023] [Citation(s) in RCA: 12] [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: 11/14/2017] [Revised: 02/02/2018] [Accepted: 02/24/2018] [Indexed: 02/07/2023]
Abstract
Decline in cognitive functions, including hippocampus-dependent spatial memory, is commonly observed at a later stage of aging (e.g., >20 months old in rodents) and typically studied after a discrete learning event. How normal aging, particularly at an early stage, affects the modulatory aspect of memory persistence is underinvestigated. Previous studies in young animals show that weak, fading memories can last longer if a modulating event, such as spatial novelty, is introduced around memory encoding. This is known as behavioral tagging and capture (BTC). Here, we investigated how early aging (10-13 months old) affects BTC in an appetitive delayed-matching-to-place task. We trained rats when they were young and middle aged and found that novelty facilitated long-term memory persistence in young but not in middle-aged rats. However, re-exposure to the encoded environment after learning improved memory persistence in middle-aged rats. BTC, combined with memory reactivation, facilitated memory persistence through reconsolidation. Our results point toward a weakened tagging and capture mechanism before reduction of plasticity-related proteins at an early stage of aging.
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Affiliation(s)
- Alexandra Gros
- Centre for Clinical Brain Sciences, The University of Edinburgh, Edinburgh, Scotland, UK
| | - Szu-Han Wang
- Centre for Clinical Brain Sciences, The University of Edinburgh, Edinburgh, Scotland, UK; Centre for Cognitive Ageing and Cognitive Epidemiology, The University of Edinburgh, Edinburgh, Scotland, UK.
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26
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Aging and an Immune Challenge Interact to Produce Prolonged, but Not Permanent, Reductions in Hippocampal L-LTP and mBDNF in a Rodent Model with Features of Delirium. eNeuro 2018; 5:eN-NWR-0009-18. [PMID: 29911174 PMCID: PMC6001264 DOI: 10.1523/eneuro.0009-18.2018] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Revised: 05/02/2018] [Accepted: 05/04/2018] [Indexed: 12/29/2022] Open
Abstract
Aging increases the risk of abrupt declines in cognitive function after an event that triggers immune system activation (e.g. surgery, infection, or injury). This phenomenon is poorly understood, but rodent models may provide clues. We have previously shown that aging (24-mo-old) F344xBN rats generally do not show significant physical or cognitive impairments. However, their brains mount an exaggerated inflammatory response to signals triggered by a peripheral immune challenge (an intraperitoneal injection of Escherichia coli or laparotomy). Their hippocampal levels of the proinflammatory cytokine IL-1β are significantly elevated for at least 8 d, but generally less than 14 d, after infection or surgery. This IL-1β elevation is mirrored by prolonged deficits in a hippocampus-dependent long-term memory task. In contrast, young (3-mo-old) counterparts exhibit only transient elevations in IL-1β that drop to near baseline levels within 24 h. We previously demonstrated that theta burst–evoked late-phase long-term potentiation (L-LTP)—a BDNF-dependent form of synaptic plasticity—is impaired in hippocampal area CA1 of aged animals 4 d after infection. Also, levels of mature brain-derived neurotrophic factor (mBDNF)—the protein isoform required for stabilization of L-LTP—are reduced in hippocampal synaptoneurosomes of aged animals at the same time point. In this study, we investigated whether the deficits in L-LTP and mBDNF persist in parallel with the elevation in IL-1β and impairment in memory. This was the case, consistent with the idea that an exaggerated brain inflammatory response may compromise memory consolidation in part by altering availability of mBDNF to stabilize memory-related synaptic plasticity.
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Shu G, Kramár EA, López AJ, Huynh G, Wood MA, Kwapis JL. Deleting HDAC3 rescues long-term memory impairments induced by disruption of the neuron-specific chromatin remodeling subunit BAF53b. ACTA ACUST UNITED AC 2018; 25:109-114. [PMID: 29449454 PMCID: PMC5817283 DOI: 10.1101/lm.046920.117] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Accepted: 12/19/2017] [Indexed: 12/31/2022]
Abstract
Multiple epigenetic mechanisms, including histone acetylation and nucleosome remodeling, are known to be involved in long-term memory formation. Enhancing histone acetylation by deleting histone deacetylases, like HDAC3, typically enhances long-term memory formation. In contrast, disrupting nucleosome remodeling by blocking the neuron-specific chromatin remodeling subunit BAF53b impairs long-term memory. Here, we show that deleting HDAC3 can ameliorate the impairments in both long-term memory and synaptic plasticity caused by BAF53b mutation. This suggests a dynamic interplay exists between histone acetylation/deacetylation and nucleosome remodeling mechanisms in the regulation of memory formation.
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Affiliation(s)
- Guanhua Shu
- Department of Neurobiology and Behavior, University of California, Irvine, California, 92697, USA.,Center for Neurobiology of Learning and Memory, Irvine, California, 92697, USA
| | - Enikö A Kramár
- Department of Neurobiology and Behavior, University of California, Irvine, California, 92697, USA.,Center for Neurobiology of Learning and Memory, Irvine, California, 92697, USA
| | - Alberto J López
- Department of Neurobiology and Behavior, University of California, Irvine, California, 92697, USA.,Center for Neurobiology of Learning and Memory, Irvine, California, 92697, USA
| | - Grace Huynh
- Department of Neurobiology and Behavior, University of California, Irvine, California, 92697, USA.,Center for Neurobiology of Learning and Memory, Irvine, California, 92697, USA
| | - Marcelo A Wood
- Department of Neurobiology and Behavior, University of California, Irvine, California, 92697, USA.,Center for Neurobiology of Learning and Memory, Irvine, California, 92697, USA
| | - Janine L Kwapis
- Department of Neurobiology and Behavior, University of California, Irvine, California, 92697, USA.,Center for Neurobiology of Learning and Memory, Irvine, California, 92697, USA
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28
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Zhu X, Wang S, Yu L, Jin J, Ye X, Liu Y, Xu Y. HDAC3 negatively regulates spatial memory in a mouse model of Alzheimer's disease. Aging Cell 2017; 16:1073-1082. [PMID: 28771976 PMCID: PMC5595690 DOI: 10.1111/acel.12642] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/27/2017] [Indexed: 02/06/2023] Open
Abstract
The accumulation and deposition of beta-amyloid (Aβ) is a key neuropathological hallmark of Alzheimer's disease (AD). Histone deacetylases (HDACs) are promising therapeutic targets for the treatment of AD, while the specific HDAC isoforms associated with cognitive improvement are poorly understood. In this study, we investigate the role of HDAC3 in the pathogenesis of AD. Nuclear HDAC3 is significantly increased in the hippocampus of 6- and 9-month-old APPswe/PS1dE9 (APP/PS1) mice compared with that in age-matched wild-type C57BL/6 (B6) mice. Lentivirus -mediated inhibition or overexpression of HDAC3 was used in the hippocampus of APP/PS1 mice to investigate the role of HDAC3 in spatial memory, amyloid burden, dendritic spine density, glial activation and tau phosphorylation. Inhibition of HDAC3 in the hippocampus attenuates spatial memory deficits, as indicated in the Morris water maze test, and decreases amyloid plaque load and Aβ levels in the brains of APP/PS1 mice. Dendritic spine density is increased, while microglial activation is alleviated after HDAC3 inhibition in the hippocampus of 9-month-old APP/PS1 mice. Furthermore, HDAC3 overexpression in the hippocampus increases Aβ levels, activates microglia, and decreases dendritic spine density in 6-month-old APP/PS1 mice. In conclusion, our results indicate that HDAC3 negatively regulates spatial memory in APP/PS1 mice and HDAC3 inhibition might represent a potential therapy for the treatment of AD.
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Affiliation(s)
- Xiaolei Zhu
- The State Key Laboratory of Pharmaceutical Biotechnology; Department of Neurology; Medical School; Drum Tower Hospital; Nanjing University; Nanjing China
- Jiangsu Key Laboratory for Molecular Medicine; Medical School of Nanjing University; Nanjing China
- Nanjing Neuropsychiatry Clinic Medical Center; Nanjing China
| | - Sulei Wang
- Department of Neurology; Nanjing Hospital of Traditional Chinese Medicine; Nanjing China
| | - Linjie Yu
- The State Key Laboratory of Pharmaceutical Biotechnology; Department of Neurology; Medical School; Drum Tower Hospital; Nanjing University; Nanjing China
| | - Jiali Jin
- The State Key Laboratory of Pharmaceutical Biotechnology; Department of Neurology; Medical School; Drum Tower Hospital; Nanjing University; Nanjing China
| | - Xing Ye
- The State Key Laboratory of Pharmaceutical Biotechnology; Department of Neurology; Medical School; Drum Tower Hospital; Nanjing University; Nanjing China
| | - Yi Liu
- The State Key Laboratory of Pharmaceutical Biotechnology; Department of Neurology; Medical School; Drum Tower Hospital; Nanjing University; Nanjing China
| | - Yun Xu
- The State Key Laboratory of Pharmaceutical Biotechnology; Department of Neurology; Medical School; Drum Tower Hospital; Nanjing University; Nanjing China
- Jiangsu Key Laboratory for Molecular Medicine; Medical School of Nanjing University; Nanjing China
- Nanjing Neuropsychiatry Clinic Medical Center; Nanjing China
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Increased GSNOR Expression during Aging Impairs Cognitive Function and Decreases S-Nitrosation of CaMKIIα. J Neurosci 2017; 37:9741-9758. [PMID: 28883020 DOI: 10.1523/jneurosci.0681-17.2017] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 07/27/2017] [Accepted: 08/03/2017] [Indexed: 11/21/2022] Open
Abstract
As the population ages, an increasing number of people suffer from age-related cognitive impairment. However, the mechanisms underlying this process remain unclear. Here, we found that S-nitrosoglutathione reductase (GSNOR), the key enzyme that metabolizes intracellular nitric oxide (NO) and regulates S-nitrosation, was significantly increased in the hippocampus of both aging humans and mice. Transgenic mice overexpressing GSNOR exclusively in neurons showed cognitive impairment in behavioral tests, including the Morris water maze, fear conditioning, and the Y-maze test. We also found that GSNOR transgenic mice have LTP defects and lower dendrite spine density, whereas GSNOR knock-out mice rescued the age-related cognitive impairment. Analysis of S-nitrosation showed significantly decreased hippocampal CaMKIIα S-nitrosation in naturally aged mice and GSNOR transgenic mice. Consistent with the change in CaMKIIα S-nitrosation, the accumulation of CaMKIIα in the hippocampal synaptosomal fraction, as well as its downstream signaling targets p(S831)-GLUR1, was also significantly decreased. All these effects could be rescued in the GSNOR knock-out mice. We further verified that the S-nitrosation of CaMKIIα was responsible for the CaMKIIα synaptosomal accumulation by mutating CaMKIIα S-nitrosated sites (C280/C289). Upregulation of the NO signaling pathway rescued the cognitive impairment in GSNOR transgenic mice. In summary, our research demonstrates that GSNOR impairs cognitive function in aging and it could serve as a new potential target for the treatment of age-related cognitive impairment. In contrast to the free radical theory of aging, NO signaling deficiency may be the main mediator of age-related cognitive impairment.SIGNIFICANCE STATEMENT This study indicated that S-nitrosoglutathione reductase (GSNOR), a key protein S-nitrosation metabolic enzyme, is a new potential target in age-related cognitive impairment; and in contrast to the free radical theory of aging, NO signaling deficiency may be the main cause of this process. In addition, increased GSNOR expression during aging decreases S-nitrosation of CaMKIIα and reduces CaMKIIα synaptosomal accumulation. To our knowledge, it is for the first time to show the cellular function regulation of CaMKIIα by GSNOR-dependent S-nitrosation as a new post-translational modification after its phosphorylation was explored. These findings elucidate a novel mechanism of age-related cognitive impairment and may provide a new potential target and strategy for slowing down this process.
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A selective inhibitor of histone deacetylase 3 prevents cognitive deficits and suppresses striatal CAG repeat expansions in Huntington's disease mice. Sci Rep 2017; 7:6082. [PMID: 28729730 PMCID: PMC5519595 DOI: 10.1038/s41598-017-05125-2] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Accepted: 05/24/2017] [Indexed: 12/03/2022] Open
Abstract
Huntington’s disease (HD) is a neurodegenerative disorder whose major symptoms include progressive motor and cognitive dysfunction. Cognitive decline is a critical quality of life concern for HD patients and families. The enzyme histone deacetylase 3 (HDAC3) appears to be important in HD pathology by negatively regulating genes involved in cognitive functions. Furthermore, HDAC3 has been implicated in the aberrant transcriptional patterns that help cause disease symptoms in HD mice. HDAC3 also helps fuel CAG repeat expansions in human cells, suggesting that HDAC3 may power striatal expansions in the HTT gene thought to drive disease progression. This multifaceted role suggests that early HDAC3 inhibition offers an attractive mechanism to prevent HD cognitive decline and to suppress striatal expansions. This hypothesis was investigated by treating HdhQ111 knock-in mice with the HDAC3-selective inhibitor RGFP966. Chronic early treatment prevented long-term memory impairments and normalized specific memory-related gene expression in hippocampus. Additionally, RGFP966 prevented corticostriatal-dependent motor learning deficits, significantly suppressed striatal CAG repeat expansions, partially rescued striatal protein marker expression and reduced accumulation of mutant huntingtin oligomeric forms. These novel results highlight RGFP966 as an appealing multiple-benefit therapy in HD that concurrently prevents cognitive decline and suppresses striatal CAG repeat expansions.
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Shivarama Shetty M, Sajikumar S. 'Tagging' along memories in aging: Synaptic tagging and capture mechanisms in the aged hippocampus. Ageing Res Rev 2017; 35:22-35. [PMID: 28065806 DOI: 10.1016/j.arr.2016.12.008] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 12/12/2016] [Accepted: 12/30/2016] [Indexed: 02/06/2023]
Abstract
Aging is accompanied by a general decline in the physiological functions of the body with the deteriorating organ systems. Brain is no exception to this and deficits in cognitive functions are quite common in advanced aging. Though a variety of age-related alterations are observed in the structure and function throughout the brain, certain regions show selective vulnerability. Medial temporal lobe, especially the hippocampus, is one such preferentially vulnerable region and is a crucial structure involved in the learning and long-term memory functions. Hippocampal synaptic plasticity, such as long-term potentiation (LTP) and depression (LTD), are candidate cellular correlates of learning and memory and alterations in these properties have been well documented in aging. A related phenomenon called synaptic tagging and capture (STC) has been proposed as a mechanism for cellular memory consolidation and to account for temporal association of memories. Mounting evidences from behavioral settings suggest that STC could be a physiological phenomenon. In this article, we review the recent data concerning STC and provide a framework for how alterations in STC-related mechanisms could contribute to the age-associated memory impairments. The enormity of impairment in learning and memory functions demands an understanding of age-associated memory deficits at the fundamental level given its impact in the everyday tasks, thereby in the quality of life. Such an understanding is also crucial for designing interventions and preventive measures for successful brain aging.
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32
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Shetty MS, Sharma M, Sajikumar S. Chelation of hippocampal zinc enhances long-term potentiation and synaptic tagging/capture in CA1 pyramidal neurons of aged rats: implications to aging and memory. Aging Cell 2017; 16:136-148. [PMID: 27633878 PMCID: PMC5242293 DOI: 10.1111/acel.12537] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/18/2016] [Indexed: 01/08/2023] Open
Abstract
Aging is associated with decline in cognitive functions, prominently in the memory consolidation and association capabilities. Hippocampus plays a crucial role in the formation and maintenance of long‐term associative memories, and a significant body of evidence shows that impairments in hippocampal function correlate with aging‐related memory loss. A number of studies have implicated alterations in hippocampal synaptic plasticity, such as long‐term potentiation (LTP), in age‐related cognitive decline although exact mechanisms underlying are not completely clear. Zinc deficiency and the resultant adverse effects on cognition have been well studied. However, the role of excess of zinc in synaptic plasticity, especially in aging, is not addressed well. Here, we have investigated the hippocampal zinc levels and the impairments in synaptic plasticity, such as LTP and synaptic tagging and capture (STC), in the CA1 region of acute hippocampal slices from 82‐ to 84‐week‐old male Wistar rats. We report increased zinc levels in the hippocampus of aged rats and also deficits in the tetani‐induced and dopaminergic agonist‐induced late‐LTP and STC. The observed deficits in synaptic plasticity were restored upon chelation of zinc using a cell‐permeable chelator. These data suggest that functional plasticity and associativity can be successfully established in aged neural networks by chelating zinc with cell‐permeable chelating agents.
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Affiliation(s)
- Mahesh Shivarama Shetty
- Department of Physiology; Yong Loo Lin School of Medicine; National University of Singapore; Block MD9, 2 Medical Drive Singapore 117 597 Singapore
- Neurobiology/Aging Program; Life Sciences Institute (LSI); National University of Singapore; #04-44, 28 Medical Drive Singapore 117 456 Singapore
| | - Mahima Sharma
- Department of Physiology; Yong Loo Lin School of Medicine; National University of Singapore; Block MD9, 2 Medical Drive Singapore 117 597 Singapore
- Neurobiology/Aging Program; Life Sciences Institute (LSI); National University of Singapore; #04-44, 28 Medical Drive Singapore 117 456 Singapore
| | - Sreedharan Sajikumar
- Department of Physiology; Yong Loo Lin School of Medicine; National University of Singapore; Block MD9, 2 Medical Drive Singapore 117 597 Singapore
- Neurobiology/Aging Program; Life Sciences Institute (LSI); National University of Singapore; #04-44, 28 Medical Drive Singapore 117 456 Singapore
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Neurosteroids Involvement in the Epigenetic Control of Memory Formation and Storage. Neural Plast 2016; 2016:5985021. [PMID: 28090360 PMCID: PMC5206442 DOI: 10.1155/2016/5985021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Accepted: 11/10/2016] [Indexed: 12/14/2022] Open
Abstract
Memory is our ability to store and remember past experiences; it is the result of changes in neuronal circuits of specific brain areas as the hippocampus. During memory formation, neurons integrate their functions and increase the strength of their connections, so that synaptic plasticity is improved and consolidated. All these processes recruit several proteins at the synapses, whose expression is highly regulated by DNA methylation and histone tails posttranslational modifications. Steroids are known to influence memory process, and, among them, neurosteroids are implicated in neurodegenerative disease related to memory loss and cognitive impairment. The epigenetic control of neurosteroids involvement in memory formation and maintenance could represent the basis for neuroregenerative therapies.
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Krishna K, Behnisch T, Sajikumar S. Inhibition of Histone Deacetylase 3 Restores Amyloid-β Oligomer-Induced Plasticity Deficit in Hippocampal CA1 Pyramidal Neurons. J Alzheimers Dis 2016; 51:783-91. [PMID: 26890755 DOI: 10.3233/jad-150838] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Neurodegenerative diseases such as Alzheimer's disease (AD) are associated with alterations in epigenetic factors leading to cognitive decline. Histone deacetylase 3 (HDAC3) is a known critical epigenetic negative regulator of learning and memory. In this study, attenuation of long-term potentiation by amyloid-β oligomer, and its reversal by specific HDAC3 inhibitor RGFP966, was performed in rat CA1 pyramidal neurons using whole cell voltage-clamp and field recording techniques. Our findings provide the first evidence that amyloid-β oligomer-induced synaptic plasticity impairment can be prevented by inhibition of HDAC3 enzyme both at the single neuron as well as in a population of neurons, thus identifying HDAC3 as a potential target for ameliorating AD related plasticity impairments.
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Affiliation(s)
- Kumar Krishna
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - 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
| | - Sreedharan Sajikumar
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,Neurobiology/Aging Program, Life Sciences Institute (LSI), National University of Singapore, Singapore
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Wu Y, Hou F, Wang X, Kong Q, Han X, Bai B. Aberrant Expression of Histone Deacetylases 4 in Cognitive Disorders: Molecular Mechanisms and a Potential Target. Front Mol Neurosci 2016; 9:114. [PMID: 27847464 PMCID: PMC5088184 DOI: 10.3389/fnmol.2016.00114] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Accepted: 10/17/2016] [Indexed: 12/14/2022] Open
Abstract
Histone acetylation is a major mechanism of chromatin remodeling, contributing to epigenetic regulation of gene transcription. Histone deacetylases (HDACs) are involved in both physiological and pathological conditions by regulating the status of histone acetylation. Although histone deacetylase 4 (HDAC4), a member of the HDAC family, may lack HDAC activity, it is actively involved in regulating the transcription of genes involved in synaptic plasticity, neuronal survival, and neurodevelopment by interacting with transcription factors, signal transduction molecules and HDAC3, another member of the HDAC family. HDAC4 is highly expressed in brain and its homeostasis is crucial for the maintenance of cognitive function. Accumulated evidence shows that HDAC4 expression is dysregulated in several brain disorders, including neurodegenerative diseases and mental disorders. Moreover, cognitive impairment is a characteristic feature of these diseases. It indicates that aberrant HDAC4 expression plays a pivotal role in cognitive impairment of these disorders. This review aims to describe the current understanding of HDAC4's role in the maintenance of cognitive function and its dysregulation in neurodegenerative diseases and mental disorders, discuss underlying molecular mechanisms, and provide an outlook into targeting HDAC4 as a potential therapeutic approach to rescue cognitive impairment in these diseases.
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Affiliation(s)
- Yili Wu
- Department of Psychiatry, Jining Medical UniversityJining, China; Collaborative Innovation Center for Birth Defect Research and Transformation of Shandong Province, Jining Medical UniversityJining, China
| | - Fei Hou
- College of Science, Qufu Normal University Jining, China
| | - Xin Wang
- Department of Psychiatry, Jining Medical University Jining, China
| | - Qingsheng Kong
- Collaborative Innovation Center for Birth Defect Research and Transformation of Shandong Province, Jining Medical UniversityJining, China; Department of Biochemistry, Jining Medical UniversityJining, China
| | - Xiaolin Han
- Collaborative Innovation Center for Birth Defect Research and Transformation of Shandong Province, Jining Medical University Jining, China
| | - Bo Bai
- Collaborative Innovation Center for Birth Defect Research and Transformation of Shandong Province, Jining Medical University Jining, China
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Fonseca R. The aging memory: Modulating epigenetic modifications to improve cognitive function. Neurobiol Learn Mem 2016; 133:182-184. [DOI: 10.1016/j.nlm.2016.07.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Revised: 06/30/2016] [Accepted: 07/03/2016] [Indexed: 11/16/2022]
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