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Abstract
Spike-timing-dependent plasticity (STDP) is considered as a primary mechanism underlying formation of new memories during learning. Despite the growing interest in activity-dependent plasticity, it is still unclear whether synaptic plasticity rules inferred from in vitro experiments are correct in physiological conditions. The abnormally high calcium concentration used in in vitro studies of STDP suggests that in vivo plasticity rules may differ significantly from in vitro experiments, especially since STDP depends strongly on calcium for induction. We therefore studied here the influence of extracellular calcium on synaptic plasticity. Using a combination of experimental (patch-clamp recording and Ca2+ imaging at CA3-CA1 synapses) and theoretical approaches, we show here that the classic STDP rule in which pairs of single pre- and postsynaptic action potentials induce synaptic modifications is not valid in the physiological Ca2+ range. Rather, we found that these pairs of single stimuli are unable to induce any synaptic modification in 1.3 and 1.5 mM calcium and lead to depression in 1.8 mM. Plasticity can only be recovered when bursts of postsynaptic spikes are used, or when neurons fire at sufficiently high frequency. In conclusion, the STDP rule is profoundly altered in physiological Ca2+, but specific activity regimes restore a classical STDP profile.
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Bertrand C, Deschamps C, Rabiant K, Peineau S, Antol J, Martinetti M, Naassila M, Vilpoux C, Pierrefiche O. Patch-Clamp Recording of Low Frequency Stimulation-induced Long-Term Synaptic Depression in Rat Hippocampus Slices During Early and Late Neurodevelopment. Alcohol Clin Exp Res 2020; 45:351-364. [PMID: 33196109 DOI: 10.1111/acer.14516] [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: 07/17/2020] [Accepted: 11/05/2020] [Indexed: 11/28/2022]
Abstract
BACKGROUND Studying synaptic plasticity in the rat hippocampus slice is a well-established way to analyze cellular mechanisms related to learning and memory. Different modes of recording can be used, such as extracellular field excitatory post-synaptic potential (EPSP) and diverse patch-clamp methods. However, most studies using these methods have examined only up to the juvenile stage of brain maturation, which is known to terminate during late adolescence/early adulthood. Moreover, several animal models of human diseases have been developed at this late stage of brain development. To study the vulnerability of adolescent rat to the cognitive impairment of alcohol, we developed a model of binge-like exposure in which ethanol selectively abolishes low frequency stimulation (LFS)-induced, field EPSP long-term depression (LTD) in the rat hippocampus slice. METHODS In the present study, we sought to use whole-cell patch-clamp recording in the voltage-clamp mode to further investigate the mechanisms involved in the abolition of LFS-induced LTD in our model of binge-like exposure in adolescent rat hippocampus slices. In addition, we investigated LFS-induced NMDAR-LTD and mGluR-LTD at different ages and changed several parameters to improve the recordings. RESULTS Using patch-clamp recording, LFS-induced NMDAR-LTD and mGluR-LTD could be measured until 4 weeks of age, but not in older animals. Similarly, chemical mGluR-LTD and a combined LFS-LTD involving both N-Methyl-D-Aspartate Receptor (NMDAR) and mGluR were not measured in older animals. The absence of LFS-LTD was not due to the loss of a diffusible intracellular agent nor the voltage mode of recording or intracellular blockade of either sodium or potassium currents. In contrast to voltage-clamp recordings, LFS-induced LTD tested with field recordings was measured at all ages and the effects of EtOH were visible in all cases. CONCLUSIONS We concluded that whole-cell patch-clamp recordings are not suitable for studying synaptic LFS-induced LTD in rats older than 4 weeks of age and therefore cannot be used to explore electrophysiological disturbances, such as those induced by alcohol binge drinking during adolescence, which constitutes a late period of brain maturation.
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Affiliation(s)
- Cédric Bertrand
- UMR1247 INSERM, Groupe de Recherche sur l'Alcool et les Pharmacodépendances, Centre Universitaire de Recherche en Santé, Université de Picardie Jules Verne, Amiens, France
| | - Chloé Deschamps
- UMR1247 INSERM, Groupe de Recherche sur l'Alcool et les Pharmacodépendances, Centre Universitaire de Recherche en Santé, Université de Picardie Jules Verne, Amiens, France
| | - Kevin Rabiant
- UMR1247 INSERM, Groupe de Recherche sur l'Alcool et les Pharmacodépendances, Centre Universitaire de Recherche en Santé, Université de Picardie Jules Verne, Amiens, France
| | - Stéphane Peineau
- UMR1247 INSERM, Groupe de Recherche sur l'Alcool et les Pharmacodépendances, Centre Universitaire de Recherche en Santé, Université de Picardie Jules Verne, Amiens, France
| | - Johann Antol
- UMR1247 INSERM, Groupe de Recherche sur l'Alcool et les Pharmacodépendances, Centre Universitaire de Recherche en Santé, Université de Picardie Jules Verne, Amiens, France
| | | | - Mickael Naassila
- UMR1247 INSERM, Groupe de Recherche sur l'Alcool et les Pharmacodépendances, Centre Universitaire de Recherche en Santé, Université de Picardie Jules Verne, Amiens, France
| | - Catherine Vilpoux
- UMR1247 INSERM, Groupe de Recherche sur l'Alcool et les Pharmacodépendances, Centre Universitaire de Recherche en Santé, Université de Picardie Jules Verne, Amiens, France
| | - Olivier Pierrefiche
- UMR1247 INSERM, Groupe de Recherche sur l'Alcool et les Pharmacodépendances, Centre Universitaire de Recherche en Santé, Université de Picardie Jules Verne, Amiens, France
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Foster WJ, Taylor HBC, Padamsey Z, Jeans AF, Galione A, Emptage NJ. Hippocampal mGluR1-dependent long-term potentiation requires NAADP-mediated acidic store Ca 2+ signaling. Sci Signal 2018; 11:11/558/eaat9093. [PMID: 30482851 DOI: 10.1126/scisignal.aat9093] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Acidic organelles, such as endosomes and lysosomes, store Ca2+ that is released in response to intracellular increases in the second messenger nicotinic acid adenine dinucleotide phosphate (NAADP). In neurons, NAADP and Ca2+ signaling contribute to synaptic plasticity, a process of activity-dependent long-term potentiation (LTP) [or, alternatively, long-term depression (LTD)] of synaptic strength and neuronal transmission that is critical for neuronal function and memory formation. We explored the function of and mechanisms regulating acidic Ca2+ store signaling in murine hippocampal neurons. We found that metabotropic glutamate receptor 1 (mGluR1) was coupled to NAADP signaling that elicited Ca2+ release from acidic stores. In turn, this released Ca2+-mediated mGluR1-dependent LTP by transiently inhibiting SK-type K+ channels, possibly through the activation of protein phosphatase 2A. Genetically removing two-pore channels (TPCs), which are endolysosomal-specific ion channels, switched the polarity of plasticity from LTP to LTD, indicating the importance of specific receptor store coupling and providing mechanistic insight into how mGluR1 can produce both synaptic potentiation and synaptic depression.
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Affiliation(s)
- William J Foster
- Department of Pharmacology, University of Oxford, Mansfield Road, Oxford OX1 3QT, UK.
| | - Henry B C Taylor
- Department of Pharmacology, University of Oxford, Mansfield Road, Oxford OX1 3QT, UK
| | - Zahid Padamsey
- Department of Pharmacology, University of Oxford, Mansfield Road, Oxford OX1 3QT, UK
| | - Alexander F Jeans
- Department of Pharmacology, University of Oxford, Mansfield Road, Oxford OX1 3QT, UK
| | - Antony Galione
- Department of Pharmacology, University of Oxford, Mansfield Road, Oxford OX1 3QT, UK.
| | - Nigel J Emptage
- Department of Pharmacology, University of Oxford, Mansfield Road, Oxford OX1 3QT, UK.
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Scheefhals N, MacGillavry HD. Functional organization of postsynaptic glutamate receptors. Mol Cell Neurosci 2018; 91:82-94. [PMID: 29777761 PMCID: PMC6276983 DOI: 10.1016/j.mcn.2018.05.002] [Citation(s) in RCA: 98] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 04/16/2018] [Accepted: 05/07/2018] [Indexed: 01/28/2023] Open
Abstract
Glutamate receptors are the most abundant excitatory neurotransmitter receptors in the brain, responsible for mediating the vast majority of excitatory transmission in neuronal networks. The AMPA- and NMDA-type ionotropic glutamate receptors (iGluRs) are ligand-gated ion channels that mediate the fast synaptic responses, while metabotropic glutamate receptors (mGluRs) are coupled to downstream signaling cascades that act on much slower timescales. These functionally distinct receptor sub-types are co-expressed at individual synapses, allowing for the precise temporal modulation of postsynaptic excitability and plasticity. Intriguingly, these receptors are differentially distributed with respect to the presynaptic release site. While iGluRs are enriched in the core of the synapse directly opposing the release site, mGluRs reside preferentially at the border of the synapse. As such, to understand the differential contribution of these receptors to synaptic transmission, it is important to not only consider their signaling properties, but also the mechanisms that control the spatial segregation of these receptor types within synapses. In this review, we will focus on the mechanisms that control the organization of glutamate receptors at the postsynaptic membrane with respect to the release site, and discuss how this organization could regulate synapse physiology.
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Affiliation(s)
- Nicky Scheefhals
- Cell Biology, Department of Biology, Faculty of Science, Utrecht University, 3584 CH Utrecht, The Netherlands
| | - Harold D MacGillavry
- Cell Biology, Department of Biology, Faculty of Science, Utrecht University, 3584 CH Utrecht, The Netherlands.
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Sun DG, Kang H, Tetteh H, Su J, Lee J, Park SW, He J, Jo J, Yang S, Yang S. Long term potentiation, but not depression, in interlamellar hippocampus CA1. Sci Rep 2018; 8:5187. [PMID: 29581468 PMCID: PMC5979950 DOI: 10.1038/s41598-018-23369-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Accepted: 03/12/2018] [Indexed: 01/23/2023] Open
Abstract
Synaptic plasticity in the lamellar CA3 to CA1 circuitry has been extensively studied while interlamellar CA1 to CA1 connections have not yet received much attention. One of our earlier studies demonstrated that axons of CA1 pyramidal neurons project to neighboring CA1 neurons, implicating information transfer along a longitudinal interlamellar network. Still, it remains unclear whether long-term synaptic plasticity is present within this longitudinal CA1 network. Here, we investigate long-term synaptic plasticity between CA1 pyramidal cells, using in vitro and in vivo extracellular recordings and 3D holography glutamate uncaging. We found that the CA1-CA1 network exhibits NMDA receptor-dependent long-term potentiation (LTP) without direction or layer selectivity. By contrast, we find no significant long-term depression (LTD) under various LTD induction protocols. These results implicate unique synaptic properties in the longitudinal projection suggesting that the interlamellar CA1 network could be a promising structure for hippocampus-related information processing and brain diseases.
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Affiliation(s)
- Duk-Gyu Sun
- Department of Biomedical Sciences, Chonnam National University Medical School, Gwangju, Korea
| | - Hyeri Kang
- Department of Nano-bioengineering, Incheon National University, Incheon, Korea
| | - Hannah Tetteh
- Department of Biomedical Sciences, City University of Hong Kong, Kowloon, Hong Kong
| | - Junfeng Su
- Department of Biomedical Sciences, City University of Hong Kong, Kowloon, Hong Kong
| | - Jihwan Lee
- Department of Biomedical Sciences, City University of Hong Kong, Kowloon, Hong Kong
| | - Sung-Won Park
- Department of Nano-bioengineering, Incheon National University, Incheon, Korea
| | - Jufang He
- Department of Biomedical Sciences, City University of Hong Kong, Kowloon, Hong Kong
| | - Jihoon Jo
- Department of Biomedical Sciences, Chonnam National University Medical School, Gwangju, Korea. .,Department of Neurology, Chonnam National University Medical School, Gwangju, Korea. .,NeuroMedical Convergence Laboratory, Biomedical Research Institute, Chonnam National University Hospital, Gwangju, Korea.
| | - Sungchil Yang
- Department of Biomedical Sciences, City University of Hong Kong, Kowloon, Hong Kong.
| | - Sunggu Yang
- Department of Nano-bioengineering, Incheon National University, Incheon, Korea.
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Colavita M, Terral G, Lemercier CE, Drago F, Marsicano G, Massa F. Layer-specific potentiation of network GABAergic inhibition in the CA1 area of the hippocampus. Sci Rep 2016; 6:28454. [PMID: 27345695 PMCID: PMC4921906 DOI: 10.1038/srep28454] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Accepted: 06/03/2016] [Indexed: 12/04/2022] Open
Abstract
One of the most important functions of GABAergic inhibition in cortical regions is the tight control of spatiotemporal activity of principal neuronal ensembles. However, electrophysiological recordings do not provide sufficient spatial information to determine the spatiotemporal properties of inhibitory plasticity. Using Voltage Sensitive Dye Imaging (VSDI) in mouse hippocampal slices, we demonstrate that GABAA-mediated field inhibitory postsynaptic potentials undergo layer-specific potentiation upon activation of metabotropic glutamate receptors (mGlu). VSDI recordings allowed detection of pharmacologically isolated GABAA-dependent hyperpolarization signals. Bath-application of the selective group-I mGlu receptor agonist, (S)-3,5-Dihydroxyphenylglycine (DHPG), induces an enhancement of the GABAergic VSDI-recorded signal, which is more or less pronounced in different hippocampal layers. This potentiation is mediated by mGlu5 and downstream activation of IP3 receptors. Our results depict network GABAergic activity in the hippocampal CA1 region and its sub-layers, showing also a novel form of inhibitory synaptic plasticity tightly coupled to glutamatergic activity.
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Affiliation(s)
- Michelangelo Colavita
- INSERM U1215, NeuroCentre Magendie, AVENIR Group "Endocannabinoids and Neuroadaptation", 33077 Bordeaux, France.,Université de Bordeaux, 33077 Bordeaux, France.,University of Catania, Biometec - Department of Biomedical and Biotechnological Sciences, 95125 Catania, Italy
| | - Geoffrey Terral
- INSERM U1215, NeuroCentre Magendie, AVENIR Group "Endocannabinoids and Neuroadaptation", 33077 Bordeaux, France.,Université de Bordeaux, 33077 Bordeaux, France
| | - Clement E Lemercier
- INSERM U1215, NeuroCentre Magendie, AVENIR Group "Endocannabinoids and Neuroadaptation", 33077 Bordeaux, France.,Université de Bordeaux, 33077 Bordeaux, France
| | - Filippo Drago
- University of Catania, Biometec - Department of Biomedical and Biotechnological Sciences, 95125 Catania, Italy
| | - Giovanni Marsicano
- INSERM U1215, NeuroCentre Magendie, AVENIR Group "Endocannabinoids and Neuroadaptation", 33077 Bordeaux, France.,Université de Bordeaux, 33077 Bordeaux, France
| | - Federico Massa
- INSERM U1215, NeuroCentre Magendie, AVENIR Group "Endocannabinoids and Neuroadaptation", 33077 Bordeaux, France.,Université de Bordeaux, 33077 Bordeaux, France
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Group I metabotropic glutamate receptors modulate late phase long-term potentiation in hippocampal CA1 pyramidal neurons: comparison of apical and basal dendrites. Neurosci Lett 2013; 553:132-7. [PMID: 23978512 DOI: 10.1016/j.neulet.2013.08.030] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2013] [Revised: 08/11/2013] [Accepted: 08/14/2013] [Indexed: 11/21/2022]
Abstract
The hippocampal long-term potentiation (LTP) at Schaffer collateral synapses onto CA1 pyramidal neurons has been widely studied as a cellular model of activity-dependent enhancement of synaptic transmission. The apical (stratum radiatum) and basal dendrites (stratum oriens) of hippocampal CA1 pyramidal neurons differ in LTP induction and maintenance. Here, the role of mGlu receptors in the induction and maintenance of late-LTP was investigated, in comparison of these two compartments. My results show that mGlu1 receptor modulates late-LTP in apical dendrites and basal dendrites, whereas mGlu5 receptor modulates late-LTP only in apical dendrites.
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Campanac E, Gasselin C, Baude A, Rama S, Ankri N, Debanne D. Enhanced Intrinsic Excitability in Basket Cells Maintains Excitatory-Inhibitory Balance in Hippocampal Circuits. Neuron 2013; 77:712-22. [DOI: 10.1016/j.neuron.2012.12.020] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/12/2012] [Indexed: 12/24/2022]
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Kwag J, Paulsen O. Gating of NMDA receptor-mediated hippocampal spike timing-dependent potentiation by mGluR5. Neuropharmacology 2012; 63:701-9. [PMID: 22652057 PMCID: PMC3396853 DOI: 10.1016/j.neuropharm.2012.05.021] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2012] [Revised: 05/14/2012] [Accepted: 05/15/2012] [Indexed: 12/21/2022]
Abstract
Hippocampal long-term potentiation (LTP) is believed to be important for learning and memory. Experimentally, the pairing of precisely timed pre- and postsynaptic spikes within a time window of ∼10 ms can induce timing-dependent LTP (tLTP), but the requirements for induction of tLTP change with development: in young rodents single postsynaptic spikes are sufficient to induce tLTP, whereas postsynaptic burst firing appears to be required in the adult. However, hippocampal neurons in vivo show theta-modulated single spike activities also in older hippocampus. Here we investigated the conditions for single spike pairing to induce tLTP at older CA3–CA1 synapses. We found that the pairing of single pre- and postsynaptic spikes could induce tLTP in older hippocampus when the postsynaptic neuronal membrane was depolarized and the pairing frequency exceeded ∼4 Hz. The spike frequency requirement is postsynaptic, as tLTP could still be induced with presynaptic stimulation at 1 Hz as long as the postsynaptic spike frequency exceeded ∼4 Hz, suggesting that postsynaptic theta-frequency activity is required for the successful induction of tLTP at older CA3–CA1 synapses. The induction of tLTP was blocked by an NMDA receptor antagonist and by the selective mGluR5 blockers, MPEP and MTEP, whereas activation of mGluR1 and mGluR5 by DHPG relieved the postsynaptic spike frequency requirement for tLTP induction. These results suggest that activation of mGluR5 during single-spike pairing at older CA3–CA1 synapses gates NMDA receptor-dependent tLTP.
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Affiliation(s)
- Jeehyun Kwag
- Department of Brain and Cognitive Engineering, Korea University, 145 Anam-Ro, Seongbuk-Gu, Seoul 136-701, Republic of Korea.
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Roles of group I metabotropic glutamate receptors under physiological conditions and in neurodegeneration. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/wmts.51] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Abstract
Despite being regarded as a hippie science for decades, cannabinoid research has finally found its well-deserved position in mainstream neuroscience. A series of groundbreaking discoveries revealed that endocannabinoid molecules are as widespread and important as conventional neurotransmitters such as glutamate or GABA, yet they act in profoundly unconventional ways. We aim to illustrate how uncovering the molecular, anatomical, and physiological characteristics of endocannabinoid signaling has revealed new mechanistic insights into several fundamental phenomena in synaptic physiology. First, we summarize unexpected advances in the molecular complexity of biogenesis and inactivation of the two endocannabinoids, anandamide and 2-arachidonoylglycerol. Then, we show how these new metabolic routes are integrated into well-known intracellular signaling pathways. These endocannabinoid-producing signalosomes operate in phasic and tonic modes, thereby differentially governing homeostatic, short-term, and long-term synaptic plasticity throughout the brain. Finally, we discuss how cell type- and synapse-specific refinement of endocannabinoid signaling may explain the characteristic behavioral effects of cannabinoids.
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Affiliation(s)
- István Katona
- Institute of Experimental Medicine, Hungarian Academy of Sciences, 1051 Budapest, Hungary.
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Kasten MR, Connelly T, Fan Y, Schulz PE. A form of synaptically induced metabotropic glutamate receptor-dependent long-term depression that does not require postsynaptic calcium. Neurosci Lett 2012; 511:12-7. [PMID: 22260795 DOI: 10.1016/j.neulet.2012.01.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2011] [Revised: 12/27/2011] [Accepted: 01/03/2012] [Indexed: 11/30/2022]
Abstract
The calcium control hypothesis posits that postsynaptic calcium increases are required to trigger synaptic plasticity, with large increases inducing LTP and small increases inducing LTD. In CA1 of the hippocampus, however, LTD induced by chemical activation of metabotropic glutamate receptors (agonist-LTD) is independent of increases in postsynaptic calcium. Here we tested whether LTD induced by pairing of presynaptic stimulation with postsynaptic depolarization (synaptic-LTD) is similarly calcium-independent. This protocol induced an NMDA-dependent LTP when paired at 0mV, which was converted to mGluR-dependent LTD when paired at -20mV. The LTD was not blocked by calcium chelation, blockers of L- or T-type voltage-dependent calcium channels, or hyperpolarization to -70mV. We conclude that synaptically induced mGluR-dependent LTD, like agonist induced mGluR LTD, does not require calcium influx for its induction.
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Affiliation(s)
- Michael R Kasten
- Department of Neurology, Baylor College of Medicine, Houston, TX 77030, USA
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Graupner M, Brunel N. Mechanisms of induction and maintenance of spike-timing dependent plasticity in biophysical synapse models. Front Comput Neurosci 2010; 4. [PMID: 20948584 PMCID: PMC2953414 DOI: 10.3389/fncom.2010.00136] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2010] [Accepted: 08/25/2010] [Indexed: 01/02/2023] Open
Abstract
We review biophysical models of synaptic plasticity, with a focus on spike-timing dependent plasticity (STDP). The common property of the discussed models is that synaptic changes depend on the dynamics of the intracellular calcium concentration, which itself depends on pre- and postsynaptic activity. We start by discussing simple models in which plasticity changes are based directly on calcium amplitude and dynamics. We then consider models in which dynamic intracellular signaling cascades form the link between the calcium dynamics and the plasticity changes. Both mechanisms of induction of STDP (through the ability of pre/postsynaptic spikes to evoke changes in the state of the synapse) and of maintenance of the evoked changes (through bistability) are discussed.
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Affiliation(s)
- Michael Graupner
- Center for Neural Science, New York University New York City, NY, USA
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