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Wu QY, Lin LH, Lu K, Deng SF, Li WM, Xu Y, Zhang B, Liu JH. Astrocytic 5-HT 1A receptor mediates age-dependent hippocampal LTD and fear memory extinction in male mice. Exp Mol Med 2024:10.1038/s12276-024-01285-0. [PMID: 39085354 DOI: 10.1038/s12276-024-01285-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 04/09/2024] [Accepted: 05/02/2024] [Indexed: 08/02/2024] Open
Abstract
NMDA receptor-dependent long-term depression (LTD) in the hippocampus is a well-known form of synaptic plasticity that has been linked to different cognitive functions. Although the underlying mechanisms remain unclear, this form of LTD cannot be induced by low-frequency stimulation (LFS) in adult mice. In this study, we found that LFS-induced LTD was not easily induced in adult animals and was age dependent. Interestingly, the level of the 5-HT1A receptor was correspondingly increased and exhibited an inverse correlation with the magnitude of LFS-LTD during development. Knockout or pharmacological inhibition of the 5-HT1A receptor reversed impaired LFS-LTD in adult mice (P60), while activation or inhibition of this receptor disturbed or enhanced LFS-LTD in adolescent mice (P21), respectively. Furthermore, the astrocytic 5-HT1A receptor in the hippocampus predominantly mediated age-dependent LFS-LTD through enhancing GABAergic neurotransmission. Finally, fear memory extinction differed among the above conditions. These observations enrich our knowledge of LTD at the cellular level and suggest a therapeutic approach for LTD-related psychiatric disorders.
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Affiliation(s)
- Qian-Yun Wu
- Department of Psychiatry, Institute of Brain Disease, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
- Guangdong-Hong Kong-Macao Greater Bay Area Center for Brain Science and Brain-Inspired Intelligence, Guangzhou, 510515, China
| | - Lian-Hong Lin
- Department of Psychiatry, Institute of Brain Disease, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
- Guangdong-Hong Kong-Macao Greater Bay Area Center for Brain Science and Brain-Inspired Intelligence, Guangzhou, 510515, China
| | - Kun Lu
- Department of Pediatric Orthopaedic, Zhengzhou Orthopaedics Hospital, Zhengzhou, 450052, China
| | - Si-Fu Deng
- Department of Psychiatry, Institute of Brain Disease, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
- Guangdong-Hong Kong-Macao Greater Bay Area Center for Brain Science and Brain-Inspired Intelligence, Guangzhou, 510515, China
| | - Wei-Min Li
- Department of Psychiatry, Institute of Brain Disease, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
- Guangdong-Hong Kong-Macao Greater Bay Area Center for Brain Science and Brain-Inspired Intelligence, Guangzhou, 510515, China
| | - Yuan Xu
- Department of Psychiatry, Institute of Brain Disease, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
- Guangdong-Hong Kong-Macao Greater Bay Area Center for Brain Science and Brain-Inspired Intelligence, Guangzhou, 510515, China
| | - Bin Zhang
- Department of Psychiatry, Institute of Brain Disease, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China.
- Guangdong-Hong Kong-Macao Greater Bay Area Center for Brain Science and Brain-Inspired Intelligence, Guangzhou, 510515, China.
| | - Ji-Hong Liu
- Department of Psychiatry, Institute of Brain Disease, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China.
- Guangdong-Hong Kong-Macao Greater Bay Area Center for Brain Science and Brain-Inspired Intelligence, Guangzhou, 510515, China.
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Khoo GH, Lin YT, Tsai TC, Hsu KS. Perineuronal Nets Restrict the Induction of Long-Term Depression in the Mouse Hippocampal CA1 Region. Mol Neurobiol 2019; 56:6436-6450. [PMID: 30826967 DOI: 10.1007/s12035-019-1526-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Accepted: 02/08/2019] [Indexed: 10/27/2022]
Abstract
Long-term depression (LTD) of synaptic efficacy is widely regarded as a cellular basis of learning and memory. The magnitude of hippocampal CA1 LTD induced by low-frequency stimulation (LFS) declines with age, but the mechanisms involved remain poorly understood. Perineuronal nets (PNNs) are specialized extracellular matrix structures that function in dampening synaptic plasticity during postnatal development, suggesting that PNN formation may restrict LTD induction in the adult hippocampus. Here, we show that PNNs tightly enwrap a subpopulation of parvalbumin (PV) interneurons in the hippocampal CA1 region and enzymatic removal of PNNs with the chondroitinase ABC alters the excitatory/inhibitory synaptic balance toward more excitation and restores the ability of LFS to induce an N-methyl-D-aspartate receptor-dependent LTD at Schaffer collateral-CA1 synapses in slices from male adult mice. Early interference with depolarizing GABA with Na+-K+-2Cl- cotransporter inhibitor bumetanide impairs the maturation of PNNs and enhances LTD induction. These results provide novel insights into a previously unrecognized role for PNNs around PV interneurons in restricting long-term synaptic plasticity at excitatory synapses on hippocampal CA1 neurons in adulthood.
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Affiliation(s)
- Guan Hock Khoo
- Department of Pharmacology, College of Medicine, National Cheng Kung University, No. 1, University Rd., Tainan City, 70101, Taiwan
| | - Yu-Ting Lin
- Department of Pharmacology, College of Medicine, National Cheng Kung University, No. 1, University Rd., Tainan City, 70101, Taiwan.,Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, 70101, Taiwan
| | - Tsung-Chih Tsai
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, 70101, Taiwan
| | - Kuei-Sen Hsu
- Department of Pharmacology, College of Medicine, National Cheng Kung University, No. 1, University Rd., Tainan City, 70101, Taiwan. .,Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, 70101, Taiwan.
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Ghoshal A, Moran SP, Dickerson JW, Joffe ME, Grueter BA, Xiang Z, Lindsley CW, Rook JM, Conn PJ. Role of mGlu 5 Receptors and Inhibitory Neurotransmission in M 1 Dependent Muscarinic LTD in the Prefrontal Cortex: Implications in Schizophrenia. ACS Chem Neurosci 2017; 8:2254-2265. [PMID: 28679049 DOI: 10.1021/acschemneuro.7b00167] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Selective potentiation of the mGlu5 subtype of metabotropic glutamate (mGlu) receptor using positive allosteric modulators (PAMs) has robust cognition-enhancing effects in rodent models that are relevant for schizophrenia. Until recently, these effects were thought to be due to potentiation of mGlu5-induced modulation of NMDA receptor (NMDAR) currents and NMDAR-dependent synaptic plasticity. However, "biased" mGlu5 PAMs that do not potentiate mGlu5 effects on NMDAR currents show efficacy that is similar to that of prototypical mGlu5 PAMs, suggesting that NMDAR-independent mechanisms must be involved in these actions. We now report that synaptic activation of mGlu5 is required for a form of long-term depression (mLTD) in mouse prefrontal cortex (PFC) that is induced by activation of M1 muscarinic acetylcholine (mAChR) receptors, which was previously thought to be independent of mGlu5 activation. Interestingly, a biased mGlu5 PAM, VU0409551, that does not potentiate mGlu5 modulation of NMDAR currents, potentiated induction of mLTD. Furthermore, coactivation of mGlu5 and M1 receptors increased GABAA-dependent inhibitory tone in the PFC pyramidal neurons, which likely contributes to the observed mLTD. Finally, systemic administration of the biased mGlu5 PAM reversed deficits in mLTD and associated cognitive deficits in a model of cortical disruption caused by repeated phencyclidine exposure that is relevant for schizophrenia and was previously shown to be responsive to selective M1 muscarinic receptor PAMs. These studies provide exciting new insights into a novel mechanism by which mGlu5 PAMs can reverse deficits in PFC function and cognition that is independent of modulation of NMDAR currents.
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Affiliation(s)
- Ayan Ghoshal
- Department of Pharmacology,
Vanderbilt Center for Neuroscience Drug Discovery, Vanderbilt University Medical Center, Nashville, Tennessee 37240, United States
| | - Sean P. Moran
- Department of Pharmacology,
Vanderbilt Center for Neuroscience Drug Discovery, Vanderbilt University Medical Center, Nashville, Tennessee 37240, United States
| | - Jonathan W. Dickerson
- Department of Pharmacology,
Vanderbilt Center for Neuroscience Drug Discovery, Vanderbilt University Medical Center, Nashville, Tennessee 37240, United States
| | - Max E. Joffe
- Department of Pharmacology,
Vanderbilt Center for Neuroscience Drug Discovery, Vanderbilt University Medical Center, Nashville, Tennessee 37240, United States
| | - Brad A. Grueter
- Department of Pharmacology,
Vanderbilt Center for Neuroscience Drug Discovery, Vanderbilt University Medical Center, Nashville, Tennessee 37240, United States
| | - Zixiu Xiang
- Department of Pharmacology,
Vanderbilt Center for Neuroscience Drug Discovery, Vanderbilt University Medical Center, Nashville, Tennessee 37240, United States
| | - Craig W. Lindsley
- Department of Pharmacology,
Vanderbilt Center for Neuroscience Drug Discovery, Vanderbilt University Medical Center, Nashville, Tennessee 37240, United States
| | - Jerri M. Rook
- Department of Pharmacology,
Vanderbilt Center for Neuroscience Drug Discovery, Vanderbilt University Medical Center, Nashville, Tennessee 37240, United States
| | - P. Jeffrey Conn
- Department of Pharmacology,
Vanderbilt Center for Neuroscience Drug Discovery, Vanderbilt University Medical Center, Nashville, Tennessee 37240, United States
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Pavlowsky A, Wallace E, Fenton AA, Alarcon JM. Persistent modifications of hippocampal synaptic function during remote spatial memory. Neurobiol Learn Mem 2017; 138:182-197. [PMID: 27568918 PMCID: PMC5326703 DOI: 10.1016/j.nlm.2016.08.015] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Revised: 08/15/2016] [Accepted: 08/19/2016] [Indexed: 12/30/2022]
Abstract
A widely accepted notion for a process underlying memory formation is that learning changes the efficacy of synapses by the mechanism of synaptic plasticity. While there is compelling evidence of changes in synaptic efficacy observed after learning, demonstration of persistent synaptic changes accompanying memory has been elusive. We report that acquisition of a hippocampus and long-term potentiation dependent place memory persistently changes the function of CA1 synapses. Using extracellular recordings we measured CA3-CA1 and EC-CA1 synaptic responses and found robust changes in the CA3-CA1 pathway after memory training. Crucially, these changes in synaptic function lasted at least a month and coincided with the persistence of long-term place memories; the changes were only observed in animals that expressed robust memory, and not in animals with poor memory recall. Interestingly, our findings were observed at the level of populations of synapses; suggesting that memory formation recruits widespread synaptic circuits and persistently reorganizes their function to store information.
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Affiliation(s)
- Alice Pavlowsky
- Department of Pathology, The Robert F. Furchgott Center for Neural and Behavioral Science, SUNY Downstate Medical Center, 450 Clarkson Avenue, Brooklyn, NY 11203, USA; The Robert F. Furchgott Center for Neural and Behavioral, SUNY Downstate Medical Center, 450 Clarkson Avenue, Brooklyn, NY 11203, USA
| | - Emma Wallace
- Graduate Program in Neural and Behavioral Science, SUNY Downstate Medical Center, 450 Clarkson Avenue, Brooklyn, NY 11203, USA
| | - André A Fenton
- The Robert F. Furchgott Center for Neural and Behavioral, SUNY Downstate Medical Center, 450 Clarkson Avenue, Brooklyn, NY 11203, USA; Department of Physiology and Pharmacology, SUNY Downstate Medical Center, 450 Clarkson Avenue, Brooklyn, NY 11203, USA; Center for Neural Science, New York University, 4 Washington Place, New York, NY 10003, USA.
| | - Juan Marcos Alarcon
- Department of Pathology, The Robert F. Furchgott Center for Neural and Behavioral Science, SUNY Downstate Medical Center, 450 Clarkson Avenue, Brooklyn, NY 11203, USA; The Robert F. Furchgott Center for Neural and Behavioral, SUNY Downstate Medical Center, 450 Clarkson Avenue, Brooklyn, NY 11203, USA.
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Tidball P, Burn HV, Teh KL, Volianskis A, Collingridge GL, Fitzjohn SM. Differential ability of the dorsal and ventral rat hippocampus to exhibit group I metabotropic glutamate receptor-dependent synaptic and intrinsic plasticity. Brain Neurosci Adv 2017; 1. [PMID: 28413831 PMCID: PMC5390859 DOI: 10.1177/2398212816689792] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Background: The hippocampus is critically involved in learning and memory processes. Although once considered a relatively homogenous structure, it is now clear that the hippocampus can be divided along its longitudinal axis into functionally distinct domains, responsible for the encoding of different types of memory or behaviour. Although differences in extrinsic connectivity are likely to contribute to this functional differentiation, emerging evidence now suggests that cellular and molecular differences at the level of local hippocampal circuits may also play a role. Methods: In this study, we have used extracellular field potential recordings to compare basal input/output function and group I metabotropic glutamate receptor-dependent forms of synaptic and intrinsic plasticity in area CA1 of slices taken from the dorsal and ventral sectors of the adult rat hippocampus. Results: Using two extracellular electrodes to simultaneously record field EPSPs and population spikes, we show that dorsal and ventral hippocampal slices differ in their basal levels of excitatory synaptic transmission, paired-pulse facilitation, and EPSP-to-Spike coupling. Furthermore, we show that slices taken from the ventral hippocampus have a greater ability than their dorsal counterparts to exhibit long-term depression of synaptic transmission and EPSP-to-Spike potentiation induced by transient application of the group I mGluR agonist (RS)-3,5-dihydroxyphenylglycine. Conclusions: Together, our results provide further evidence that the information processing properties of local hippocampal circuits differ in the dorsal and ventral hippocampal sectors, and that these differences may in turn contribute to the functional differentiation that exists along the hippocampal longitudinal axis.
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Affiliation(s)
- Patrick Tidball
- School of Physiology, Pharmacology and Neuroscience, University of Bristol, Bristol, UK
| | - Hannah V Burn
- School of Physiology, Pharmacology and Neuroscience, University of Bristol, Bristol, UK
| | - Kai Lun Teh
- School of Physiology, Pharmacology and Neuroscience, University of Bristol, Bristol, UK
| | - Arturas Volianskis
- School of Physiology, Pharmacology and Neuroscience, University of Bristol, Bristol, UK
| | - Graham L Collingridge
- School of Physiology, Pharmacology and Neuroscience, University of Bristol, Bristol, UK.,Department of Physiology, University of Toronto, Toronto, Ontario, Canada.,Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Stephen M Fitzjohn
- School of Physiology, Pharmacology and Neuroscience, University of Bristol, Bristol, UK
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Yu Y, Cao DQ, Xu HY, Sun M, Huang ZL, Yung WH, Lu N, Huang Y. 5-HT3A receptors are required in long-term depression and AMPA receptor internalization. Neuroscience 2014; 278:105-12. [DOI: 10.1016/j.neuroscience.2014.07.070] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2014] [Revised: 07/11/2014] [Accepted: 07/24/2014] [Indexed: 11/28/2022]
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Abstract
Over more than a century of research has established the fact that sleep benefits the retention of memory. In this review we aim to comprehensively cover the field of "sleep and memory" research by providing a historical perspective on concepts and a discussion of more recent key findings. Whereas initial theories posed a passive role for sleep enhancing memories by protecting them from interfering stimuli, current theories highlight an active role for sleep in which memories undergo a process of system consolidation during sleep. Whereas older research concentrated on the role of rapid-eye-movement (REM) sleep, recent work has revealed the importance of slow-wave sleep (SWS) for memory consolidation and also enlightened some of the underlying electrophysiological, neurochemical, and genetic mechanisms, as well as developmental aspects in these processes. Specifically, newer findings characterize sleep as a brain state optimizing memory consolidation, in opposition to the waking brain being optimized for encoding of memories. Consolidation originates from reactivation of recently encoded neuronal memory representations, which occur during SWS and transform respective representations for integration into long-term memory. Ensuing REM sleep may stabilize transformed memories. While elaborated with respect to hippocampus-dependent memories, the concept of an active redistribution of memory representations from networks serving as temporary store into long-term stores might hold also for non-hippocampus-dependent memory, and even for nonneuronal, i.e., immunological memories, giving rise to the idea that the offline consolidation of memory during sleep represents a principle of long-term memory formation established in quite different physiological systems.
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Affiliation(s)
- Björn Rasch
- Division of Biopsychology, Neuroscience Center Zurich, University of Zurich, Zurich, Switzerland.
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Tokay T, Rohde M, Krabbe S, Rehberg M, Bender RA, Köhling R, Kirschstein T. HCN1 channels constrain DHPG-induced LTD at hippocampal Schaffer collateral-CA1 synapses. Learn Mem 2009; 16:769-76. [PMID: 19940037 DOI: 10.1101/lm.1556009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
HCN channels play a fundamental role in determining resting membrane potential and regulating synaptic function. Here, we investigated the involvement of HCN channels in basal synaptic transmission and long-term depression (LTD) at the Schaffer collateral-CA1 synapse. Bath application of the HCN channel blocker ZD7288 (10 microM) caused a significant increase in synaptic transmission that was due to an enhancement in AMPA receptor-mediated excitatory postsynaptic potentials. This enhancement was accompanied by a significant decrease in the paired-pulse ratio (PPR), suggesting a presynaptic mechanism. Experiments with the irreversible use-dependent NMDA receptor blocker MK-801 showed that ZD7288 led to an increase in glutamate release probability. LTD induced by brief application of (RS)-3,5-dihydroxyphenylglycine (DHPG, 100 microM, 10 min) was significantly enhanced when HCN channels were blocked by ZD7288 (10 microM) prior to DHPG application. Moreover, the concomitant increase in PPR after DHPG-induced LTD was significantly larger than without ZD7288 bath application. Conversely, ZD7288 application after DHPG washout did not alter DHPG-LTD. A significant enhancement of DHPG-LTD was also observed in HCN1-deficient mice as compared with wild types. However, LTD induced by low-frequency stimulation (LFS) remained unaltered in HCN1-deficient mice, suggesting a differential effect of HCN1 channels on synaptic plasticity constraining DHPG-LTD, but not LFS-LTD.
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Affiliation(s)
- Tursonjan Tokay
- Institute of Physiology, University of Rostock, 18055 Rostock, Germany
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