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Nair JD, Wilkinson KA, Yucel BP, Mulle C, Vissel B, Mellor J, Henley JM. GluK2 Q/R editing regulates kainate receptor signaling and long-term potentiation of AMPA receptors. iScience 2023; 26:107708. [PMID: 37720087 PMCID: PMC10504484 DOI: 10.1016/j.isci.2023.107708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 07/18/2023] [Accepted: 08/23/2023] [Indexed: 09/19/2023] Open
Abstract
Q/R editing of the kainate receptor (KAR) subunit GluK2 radically alters recombinant KAR properties, but the effects on endogenous KARs in vivo remain largely unexplored. Here, we compared GluK2 editing-deficient mice that express ∼95% unedited GluK2(Q) to wild-type counterparts that express ∼85% edited GluK2(R). At mossy fiber-CA3 (MF-CA3) synapses GluK2(Q) mice displayed increased postsynaptic KAR function and KAR-mediated presynaptic facilitation, demonstrating enhanced ionotropic function. Conversely, GluK2(Q) mice exhibited reduced metabotropic KAR function, assessed by KAR-mediated inhibition of slow after-hyperpolarization currents (ISAHP). GluK2(Q) mice also had fewer GluA1-and GluA3-containing AMPA receptors (AMPARs) and reduced postsynaptic AMPAR currents at both MF-CA3 and CA1-Schaffer collateral synapses. Moreover, long-term potentiation of AMPAR-mediated transmission at CA1-Schaffer collateral synapses was reduced in GluK2(Q) mice. These findings suggest that GluK2 Q/R editing influences ionotropic/metabotropic balance of KAR signaling to regulate synaptic expression of AMPARs and plasticity.
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Affiliation(s)
- Jithin D. Nair
- Centre for Synaptic Plasticity, School of Biochemistry, Centre for Synaptic Plasticity, Biomedical Sciences Building, University of Bristol, University Walk, Bristol BS8 1TD, UK
| | - Kevin A. Wilkinson
- Centre for Synaptic Plasticity, School of Biochemistry, Centre for Synaptic Plasticity, Biomedical Sciences Building, University of Bristol, University Walk, Bristol BS8 1TD, UK
| | - Busra P. Yucel
- Centre for Synaptic Plasticity, School of Biochemistry, Centre for Synaptic Plasticity, Biomedical Sciences Building, University of Bristol, University Walk, Bristol BS8 1TD, UK
| | - Christophe Mulle
- CNRS UMR 5297, Interdisciplinary Institute of Neuroscience, University of Bordeaux, France
| | - Bryce Vissel
- Centre for Neuroscience and Regenerative Medicine, St Vincent’s Hospital, Sydney, NSW, Australia
| | - Jack Mellor
- Centre for Synaptic Plasticity, School of Physiology, Pharmacology and Neuroscience, Biomedical Sciences Building, University of Bristol, University Walk, Bristol BS8 1TD, UK
| | - Jeremy M. Henley
- Centre for Synaptic Plasticity, School of Biochemistry, Centre for Synaptic Plasticity, Biomedical Sciences Building, University of Bristol, University Walk, Bristol BS8 1TD, UK
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Ariza A, Naeini SM, Khodaei S, Ba J, Wang DS, Orser BA. Cell-surface biotinylation of GABA A receptors in mouse hippocampal slices after sevoflurane anesthesia. STAR Protoc 2023; 4:102450. [PMID: 37480561 PMCID: PMC10382930 DOI: 10.1016/j.xpro.2023.102450] [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: 02/06/2023] [Revised: 05/12/2023] [Accepted: 06/19/2023] [Indexed: 07/24/2023] Open
Abstract
Here, we present a protocol for studying the cell-surface proteins in hippocampal slices after in vivo administration of sevoflurane, an inhaled general anesthetic drug, to mice. We describe steps for anesthetic delivery, hippocampal slice preparation, and cell-surface biotinylation. We then detail the isolation of surface proteins and their quantification through Western blotting. This protocol can be adapted to study changes in other surface proteins following exposure to various general anesthetic drugs. For complete details on the use and execution of this protocol, please refer to Wang et al. (2012),1 Zurek et al. (2014),2 and Yu et al. (2019).3.
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Affiliation(s)
- Anthony Ariza
- Department of Physiology, University of Toronto, Toronto, ON, Canada.
| | | | - Shahin Khodaei
- Department of Physiology, University of Toronto, Toronto, ON, Canada
| | - Joycelyn Ba
- Department of Physiology, University of Toronto, Toronto, ON, Canada
| | - Dian-Shi Wang
- Department of Physiology, University of Toronto, Toronto, ON, Canada
| | - Beverley Anne Orser
- Department of Physiology, University of Toronto, Toronto, ON, Canada; Department of Anesthesiology & Pain Medicine, University of Toronto, Toronto, ON, Canada; Department of Anesthesia, Sunnybrook Health Sciences Centre, Toronto, ON, Canada.
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Ojanen S, Kuznetsova T, Kharybina Z, Voikar V, Lauri SE, Taira T. Interneuronal GluK1 kainate receptors control maturation of GABAergic transmission and network synchrony in the hippocampus. Mol Brain 2023; 16:43. [PMID: 37210550 DOI: 10.1186/s13041-023-01035-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 05/07/2023] [Indexed: 05/22/2023] Open
Abstract
Kainate type glutamate receptors (KARs) are strongly expressed in GABAergic interneurons and have the capability of modulating their functions via ionotropic and G-protein coupled mechanisms. GABAergic interneurons are critical for generation of coordinated network activity in both neonatal and adult brain, yet the role of interneuronal KARs in network synchronization remains unclear. Here, we show that GABAergic neurotransmission and spontaneous network activity is perturbed in the hippocampus of neonatal mice lacking GluK1 KARs selectively in GABAergic neurons. Endogenous activity of interneuronal GluK1 KARs maintains the frequency and duration of spontaneous neonatal network bursts and restrains their propagation through the hippocampal network. In adult male mice, the absence of GluK1 in GABAergic neurons led to stronger hippocampal gamma oscillations and enhanced theta-gamma cross frequency coupling, coinciding with faster spatial relearning in the Barnes maze. In females, loss of interneuronal GluK1 resulted in shorter sharp wave ripple oscillations and slightly impaired abilities in flexible sequencing task. In addition, ablation of interneuronal GluK1 resulted in lower general activity and novel object avoidance, while causing only minor anxiety phenotype. These data indicate a critical role for GluK1 containing KARs in GABAergic interneurons in regulation of physiological network dynamics in the hippocampus at different stages of development.
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Affiliation(s)
- Simo Ojanen
- Department of Veterinary Biosciences, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
- HiLife Neuroscience Center, University of Helsinki, Helsinki, Finland
| | - Tatiana Kuznetsova
- Department of Veterinary Biosciences, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
| | - Zoia Kharybina
- Department of Veterinary Biosciences, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
- HiLife Neuroscience Center, University of Helsinki, Helsinki, Finland
| | - Vootele Voikar
- HiLife Neuroscience Center, University of Helsinki, Helsinki, Finland
| | - Sari E Lauri
- HiLife Neuroscience Center, University of Helsinki, Helsinki, Finland.
- Molecular and Integrative Biosciences Research Program, University of Helsinki, Helsinki, Finland.
| | - Tomi Taira
- Department of Veterinary Biosciences, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland.
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Surface biotinylation of primary neurons to monitor changes in AMPA receptor surface expression in response to kainate receptor stimulation. STAR Protoc 2021; 2:100992. [PMID: 34934960 DOI: 10.1016/j.xpro.2021.100992] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Here, we detail a surface biotinylation technique used to label surface-expressed proteins in primary neuronal cultures. Surface proteins are labeled with membrane-impermeant Sulfo-NHS-SS-biotin, and isolated by pull-down with streptavidin beads followed by western blotting to measure levels of surface expression of the protein of interest under different conditions. We have used this approach extensively to monitor activity-dependent changes in α-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR) and kainate receptor (KAR) subunits. However, this protocol can be used to investigate any surface-expressed protein. For complete details on the use and execution of this protocol, please refer to Nair et al. (2021).
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