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Li GG, Xu YH, Sun MZ, Bing YH, Jin WZ, Qiu DL. Etomidate enhances cerebellar CF-PC synaptic plasticity through CB1 receptor/PKA cascade in vitro in mice. Neurosci Lett 2024; 826:137733. [PMID: 38492880 DOI: 10.1016/j.neulet.2024.137733] [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: 02/20/2024] [Revised: 02/28/2024] [Accepted: 03/13/2024] [Indexed: 03/18/2024]
Abstract
Etomidate (ET) is a widely used intravenous imidazole general anesthetic, which depresses the cerebellar neuronal activity by modulating various receptors activity and synaptic transmission. In this study, we investigated the effects of ET on the cerebellar climbing fiber-Purkinje cells (CF-PC) plasticity in vitro in mice using whole-cell recording technique and pharmacological methods. Our results demonstrated that CF tetanic stimulation produced a mGluR1-dependent long-term depression (LTD) of CF-PC excitatory postsynaptic currents (EPSCs), which was enhanced by bath application of ET (10 µM). Blockade of mGluR1 receptor with JNJ16259685, ET triggered the tetanic stimulation to induce a CF-PC LTD accompanied with an increase in paired-pulse ratio (PPR). The ET-triggered CF-PC LTD was abolished by extracellular administration of an N-methyl-(D)-aspartate (NMDA) receptor antagonist, D-APV, as well as by intracellular blockade of NMDA receptors activity with MK801. Furthermore, blocking cannabinoids 1 (CB1) receptor with AM251 or chelating intracellular Ca2+ with BAPTA, ET failed to trigger the CF-PC LTD. Moreover, the ET-triggered CF-PC LTD was abolished by inhibition of protein kinase A (PKA), but not by inhibition of protein kinase C inhibiter. The present results suggest that ET acts on postsynaptic NMDA receptor resulting in an enhancement of the cerebellar CF-PC LTD through CB1 receptor/PKA cascade in vitro in mice. These results provide new evidence and possible mechanism for ET anesthesia to affect motor learning and motor coordination by regulating cerebellar CF-PC LTD.
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Affiliation(s)
- Guang-Gao Li
- Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji City, Jilin Province 133002, China; Department of Orthopedics, Affiliated Hospital of Yanbian University, Yanji City, Jilin Province 133000, China
| | - Ying-Han Xu
- Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji City, Jilin Province 133002, China; Department of Orthopedics, Affiliated Hospital of Yanbian University, Yanji City, Jilin Province 133000, China
| | - Ming-Ze Sun
- Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji City, Jilin Province 133002, China; Institute of Brain Science, Jilin Medical University, Jilin City, Jilin Province 132013, China
| | - Yan-Hua Bing
- Functional Experiment Center, College of Medicine, Yanbian University, Yanji City, Jilin Province 133000, China
| | - Wen-Zhe Jin
- Department of Pain, Affiliated Hospital of Yanbian University, Yanji City, Jilin Province 133000, China
| | - De-Lai Qiu
- Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji City, Jilin Province 133002, China; Institute of Brain Science, Jilin Medical University, Jilin City, Jilin Province 132013, China; Department of Physiology, College of Basic Medicine, Jilin Meidcal University, Jilin City, Jilin Province 132013, China.
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Moldwin T, Kalmenson M, Segev I. Asymmetric Voltage Attenuation in Dendrites Can Enable Hierarchical Heterosynaptic Plasticity. eNeuro 2023; 10:ENEURO.0014-23.2023. [PMID: 37414554 PMCID: PMC10354808 DOI: 10.1523/eneuro.0014-23.2023] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2022] [Revised: 05/16/2023] [Accepted: 06/14/2023] [Indexed: 07/08/2023] Open
Abstract
Long-term synaptic plasticity is mediated via cytosolic calcium concentrations ([Ca2+]). Using a synaptic model that implements calcium-based long-term plasticity via two sources of Ca2+ - NMDA receptors and voltage-gated calcium channels (VGCCs) - we show in dendritic cable simulations that the interplay between these two calcium sources can result in a diverse array of heterosynaptic effects. When spatially clustered synaptic input produces a local NMDA spike, the resulting dendritic depolarization can activate VGCCs at nonactivated spines, resulting in heterosynaptic plasticity. NMDA spike activation at a given dendritic location will tend to depolarize dendritic regions that are located distally to the input site more than dendritic sites that are proximal to it. This asymmetry can produce a hierarchical effect in branching dendrites, where an NMDA spike at a proximal branch can induce heterosynaptic plasticity primarily at branches that are distal to it. We also explored how simultaneously activated synaptic clusters located at different dendritic locations synergistically affect the plasticity at the active synapses, as well as the heterosynaptic plasticity of an inactive synapse "sandwiched" between them. We conclude that the inherent electrical asymmetry of dendritic trees enables sophisticated schemes for spatially targeted supervision of heterosynaptic plasticity.
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Affiliation(s)
| | - Menachem Kalmenson
- Department of Neurobiology, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel
| | - Idan Segev
- Edmond and Lily Safra Center for Brain Sciences
- Department of Neurobiology, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel
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3
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Noguchi A, Ikegaya Y, Matsumoto N. In Vivo Whole-Cell Patch-Clamp Methods: Recent Technical Progress and Future Perspectives. SENSORS (BASEL, SWITZERLAND) 2021; 21:1448. [PMID: 33669656 PMCID: PMC7922023 DOI: 10.3390/s21041448] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 02/12/2021] [Accepted: 02/16/2021] [Indexed: 02/01/2023]
Abstract
Brain functions are fundamental for the survival of organisms, and they are supported by neural circuits consisting of a variety of neurons. To investigate the function of neurons at the single-cell level, researchers often use whole-cell patch-clamp recording techniques. These techniques enable us to record membrane potentials (including action potentials) of individual neurons of not only anesthetized but also actively behaving animals. This whole-cell recording method enables us to reveal how neuronal activities support brain function at the single-cell level. In this review, we introduce previous studies using in vivo patch-clamp recording techniques and recent findings primarily regarding neuronal activities in the hippocampus for behavioral function. We further discuss how we can bridge the gap between electrophysiology and biochemistry.
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Affiliation(s)
- Asako Noguchi
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, Japan; (A.N.); (Y.I.)
| | - Yuji Ikegaya
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, Japan; (A.N.); (Y.I.)
- Institute for AI and Beyond, The University of Tokyo, Tokyo 113-0033, Japan
- Center for Information and Neural Networks, National Institute of Information and Communications Technology, Suita City, Osaka 565-0871, Japan
| | - Nobuyoshi Matsumoto
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, Japan; (A.N.); (Y.I.)
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Zhang XY, Zhang YD, Cui BR, Jin R, Chu CP, Jin XH, Qiu DL. Propofol facilitates climbing fiber-Purkinje cell synaptic transmission via NMDA receptor in vitro in mice. Eur J Pharmacol 2020; 887:173474. [PMID: 32783960 DOI: 10.1016/j.ejphar.2020.173474] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 08/07/2020] [Accepted: 08/07/2020] [Indexed: 11/19/2022]
Abstract
Propofol is generally used for the induction and maintenance of anesthesia in clinical procedures via activation of γ -aminobutyric acid A (GABAA) receptors. When administered at the clinical dose, propofol use is associated with movement disorders, including dystonia and ataxia, suggesting that propofol administration impacts the function of cerebellar neuronal circuitry. In this study, we investigated the effect of propofol on climbing fiber (CF)-Purkinje cell (PC) synaptic transmission in mouse cerebellar slices in the absence of GABAergic inhibition using a whole-cell recording technique and pharmacological methods. Our results showed that bath application of propofol enhanced CF-PC synaptic transmission, which was demonstrated by an increased amplitude and area under the curve (AUC) of the excitatory postsynaptic currents (EPSCs) accompanied by a decrease in the paired-pulse ratio (PPR). The propofol-induced increase in the amplitude of P1 was concentration-dependent with a half effective concentration (EC50) of 20.9 μM. The propofol-induced increases in the amplitude and AUC of CF-PC EPSCs were abolished by an N-Methyl-D-aspartate (NMDA) receptor blocker. Furthermore, the application of NMDA enhanced CF-PC EPSCs and overwhelmed the effect of propofol on CF-PC EPSCs. Moreover, intracellular blockade of NMDA receptors attenuated the propofol-induced enhancement of CF-PC synaptic transmission but strengthened the propofol-induced change in the PPR. These results indicate that propofol enhances CF-PC synaptic transmission by activation of NMDA receptors in the mouse cerebellar cortex, suggesting that propofol administration might be involved in propofol-induced dysfunction of the cerebellum via NMDA receptors.
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Affiliation(s)
- Xin-Yuan Zhang
- Brain Science Research Center, Yanbian University, Yanji City, Jilin Province, 133002, China; Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji, Jilin Province, China
| | - Yi-Dan Zhang
- Brain Science Research Center, Yanbian University, Yanji City, Jilin Province, 133002, China; Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji, Jilin Province, China
| | - Bai-Ri Cui
- Brain Science Research Center, Yanbian University, Yanji City, Jilin Province, 133002, China; Department of Osteology, Affiliated Hospital of Yanbian University, Yanji, Jilin Province, China
| | - Ri Jin
- Brain Science Research Center, Yanbian University, Yanji City, Jilin Province, 133002, China; Department of Osteology, Affiliated Hospital of Yanbian University, Yanji, Jilin Province, China
| | - Chun-Ping Chu
- Brain Science Research Center, Yanbian University, Yanji City, Jilin Province, 133002, China; Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji, Jilin Province, China
| | - Xian-Hua Jin
- Brain Science Research Center, Yanbian University, Yanji City, Jilin Province, 133002, China; Department of Neurology, Affiliated Hospital of Yanbian University, Yanji, Jilin Province, China.
| | - De-Lai Qiu
- Brain Science Research Center, Yanbian University, Yanji City, Jilin Province, 133002, China; Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji, Jilin Province, China.
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Zamudio PA, Smothers TC, Homanics GE, Woodward JJ. Knock-in Mice Expressing an Ethanol-Resistant GluN2A NMDA Receptor Subunit Show Altered Responses to Ethanol. Alcohol Clin Exp Res 2020; 44:479-491. [PMID: 31872888 PMCID: PMC7018579 DOI: 10.1111/acer.14273] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Accepted: 12/16/2019] [Indexed: 12/19/2022]
Abstract
BACKGROUND N-methyl-D-aspartate receptors (NMDARs) are glutamate-activated, heterotetrameric ligand-gated ion channels critically important in virtually all aspects of glutamatergic signaling. Ethanol (EtOH) inhibition of NMDARs is thought to mediate specific actions of EtOH during acute and chronic exposure. Studies from our laboratory, and others, identified EtOH-sensitive sites within specific transmembrane (TM) domains involved in channel gating as well as those in subdomains of extracellular and intracellular regions of GluN1 and GluN2 subunits that affect channel function. In this study, we characterize for the first time the physiological and behavioral effects of EtOH on knock-in mice expressing a GluN2A subunit that shows reduced sensitivity to EtOH. METHODS A battery of tests evaluating locomotion, anxiety, sedation, motor coordination, and voluntary alcohol intake were performed in wild-type mice and those expressing the GluN2A A825W knock-in mutation. Whole-cell patch-clamp electrophysiological recordings were used to confirm reduced EtOH sensitivity of NMDAR-mediated currents in 2 separate brain regions (mPFC and the cerebellum) where the GluN2A subunit is known to contribute to NMDAR-mediated responses. RESULTS Male and female mice homozygous for the GluN2A(A825W) knock-in mutation showed reduced EtOH inhibition of NMDAR-mediated synaptic currents in mPFC and cerebellar neurons as compared to their wild-type counterparts. GluN2A(A825W) male but not female mice were less sensitive to the sedative and motor-incoordinating effects of EtOH and showed a rightward shift in locomotor-stimulating effects of EtOH. There was no effect of the mutation on EtOH-induced anxiolysis or voluntary EtOH consumption in either male or female mice. CONCLUSIONS These findings show that expression of EtOH-resistant GluN2A NMDARs results in selective and sex-specific changes in the behavioral sensitivity to EtOH.
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Affiliation(s)
- Paula A Zamudio
- Department of Neuroscience, Medical University of South Carolina, Charleston, South Carolina
| | - Thetford C Smothers
- Department of Neuroscience, Medical University of South Carolina, Charleston, South Carolina
| | - Gregg E Homanics
- Department of Anesthesiology and Perioperative Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - John J Woodward
- Department of Neuroscience, Medical University of South Carolina, Charleston, South Carolina
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Zamudio-Bulcock PA, Homanics GE, Woodward JJ. Loss of Ethanol Inhibition of N-Methyl-D-Aspartate Receptor-Mediated Currents and Plasticity of Cerebellar Synapses in Mice Expressing the GluN1(F639A) Subunit. Alcohol Clin Exp Res 2018; 42:698-705. [PMID: 29323417 DOI: 10.1111/acer.13597] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Accepted: 01/04/2018] [Indexed: 12/12/2022]
Abstract
BACKGROUND Glutamatergic N-methyl-d-aspartate receptors (NMDARs) are well known for their sensitivity to ethanol (EtOH) inhibition. However, the specific manner in which EtOH inhibits channel activity and how such inhibition affects neurotransmission, and ultimately behavior, remains unclear. Replacement of phenylalanine 639 with alanine (F639A) in the GluN1 subunit reduces EtOH inhibition of recombinant NMDARs. Mice expressing this subunit show reduced EtOH-induced anxiolysis, blunted locomotor stimulation following low-dose EtOH administration, and faster recovery of motor function after moderate doses of EtOH, suggesting that cerebellar dysfunction may contribute to some of these behaviors. In the mature mouse cerebellum, NMDARs at the cerebellar climbing fiber (CF) to Purkinje cell (PC) synapse are inhibited by low concentrations of EtOH and the long-term depression (LTD) of parallel fiber (PF)-mediated currents induced by concurrent activation of PFs and CFs (PF-LTD) requires activation of EtOH-sensitive NMDARs. In this study, we examined cerebellar NMDA responses and NMDA-mediated synaptic plasticity in wild-type (WT) and GluN1(F639A) mice. METHODS Patch-clamp electrophysiological recordings were performed in acute cerebellar slices from adult WT and GluN1(F639A) mice. NMDAR-mediated currents at the CF-PC synapse and NMDAR-dependent PF-LTD induction were compared for genotype-dependent differences. RESULTS Stimulation of CFs evoked robust NMDA-mediated excitatory postsynaptic currents (EPSCs) in PCs that were similar in amplitude and kinetics between WT and GluN1(F639A) mice. NMDA-mediated CF-PC EPSCs in WT mice were significantly inhibited by EtOH (50 mM) while those in mutant mice were unaffected. Concurrent stimulation of CF and PF inputs induced synaptic depression of PF-PC EPSCs in both WT and mutant mice, and this depression was blocked by the NMDA antagonist DL-APV. The synaptic depression of PF-PC EPSCs in WT mice was also blocked by a low concentration of EtOH (10 mM) that had no effect on plasticity in GluN1(F639A) mice. CONCLUSIONS These results demonstrate that inhibition of cerebellar NMDARs may be a key mechanism by which EtOH affects cerebellar-dependent behaviors.
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Affiliation(s)
- Paula A Zamudio-Bulcock
- Department of Neuroscience, Medical University of South Carolina, Charleston, South Carolina
| | - Gregg E Homanics
- Department of Anesthesiology, Univeristy of Pittsburgh, Pittsburgh, PA
| | - John J Woodward
- Department of Neuroscience, Medical University of South Carolina, Charleston, South Carolina
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Xu YH, Zhang GJ, Zhao JT, Chu CP, Li YZ, Qiu DL. Roles of N-methyl-d-aspartate receptors during the sensory stimulation-evoked field potential responses in mouse cerebellar cortical molecular layer. Neurosci Lett 2017; 660:135-139. [PMID: 28919538 DOI: 10.1016/j.neulet.2017.09.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2017] [Revised: 09/05/2017] [Accepted: 09/12/2017] [Indexed: 01/28/2023]
Abstract
The functions of N-methyl-d-aspartate receptors (NMDARs) in cerebellar cortex have been widely studied under in vitro condition, but their roles during the sensory stimulation-evoked responses in the cerebellar cortical molecular layer in living animals are currently unclear. We here investigated the roles of NMDARs during the air-puff stimulation on ipsilateral whisker pad-evoked field potential responses in cerebellar cortical molecular layer in urethane-anesthetized mice by electrophysiological recording and pharmacological methods. Our results showed that cerebellar surface administration of NMDA induced a dose-dependent decrease in amplitude of the facial stimulation-evoked inhibitory responses (P1) in the molecular layer, accompanied with decreases in decay time, half-width and area under curve (AUC) of P1. The IC50 of NMDA induced inhibition in amplitude of P1 was 46.5μM. In addition, application of NMDA induced significant increases in the decay time, half-width and AUC values of the facial stimulation-evoked excitatory responses (N1) in the molecular layer. Application of an NMDAR blocker, D-APV (250μM) abolished the facial stimulation-evoked P1 in the molecular layer. These results suggested that NMDARs play a critical role during the sensory information processing in cerebellar cortical molecular layer in vivo in mice.
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Affiliation(s)
- Yin-Hua Xu
- Key Laboratory of Cellular Function and Pharmacology of Jilin Province, Yanbian University, Yanji City, Jilin Province, 133002, China; Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji City, Jilin Province, China; Department of Neurology, Affiliated Hospital of Yanbian University, Yanji, Jilin Province, China
| | - Guang-Jian Zhang
- Key Laboratory of Cellular Function and Pharmacology of Jilin Province, Yanbian University, Yanji City, Jilin Province, 133002, China; Department of Pain, Affiliated Hospital of Yanbian University, Yanji City, Jilin Province, China
| | - Jing-Tong Zhao
- Key Laboratory of Cellular Function and Pharmacology of Jilin Province, Yanbian University, Yanji City, Jilin Province, 133002, China; Department of Cardiology, Affiliated Hospital of Yanbian University, Yanji City, Jilin Province, 133000, China
| | - Chun-Ping Chu
- Key Laboratory of Cellular Function and Pharmacology of Jilin Province, Yanbian University, Yanji City, Jilin Province, 133002, China
| | - Yu-Zi Li
- Department of Cardiology, Affiliated Hospital of Yanbian University, Yanji City, Jilin Province, 133000, China.
| | - De-Lai Qiu
- Key Laboratory of Cellular Function and Pharmacology of Jilin Province, Yanbian University, Yanji City, Jilin Province, 133002, China; Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji City, Jilin Province, China.
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Jin XH, Wang HW, Zhang XY, Chu CP, Jin YZ, Cui SB, Qiu DL. Mechanisms of Spontaneous Climbing Fiber Discharge-Evoked Pauses and Output Modulation of Cerebellar Purkinje Cell in Mice. Front Cell Neurosci 2017; 11:247. [PMID: 28878623 PMCID: PMC5572406 DOI: 10.3389/fncel.2017.00247] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Accepted: 08/04/2017] [Indexed: 11/16/2022] Open
Abstract
Climbing fiber (CF) afferents modulate the frequency and patterns of cerebellar Purkinje cell (PC) simple spike (SS) activity, but its mechanism is unclear. In the present study, we investigated the mechanisms of spontaneous CF discharge-evoked pauses and the output modulation of cerebellar PCs in urethane-anesthetized mice using in vivo whole-cell recording techniques and pharmacological methods. Under voltage-clamp recording conditions, spontaneous CF discharge evoked strong inward currents followed by small conductance calcium-activated potassium (SK) channels that mediated outward currents. The application of a GABAA receptor antagonist did not significantly alter the spontaneous SS firing rate, although an AMPA receptor blocker abolished complex spike (CS) activity and induced significantly increased SS firing rates and a decreased coefficient of variation (CV) SS value. Either removal of extracellular calcium or chelated intracellular calcium induced a decrease in amplitude of CS-evoked after-hyperpolarization (AHP) potential accompanied by an increase in SS firing rate. In addition, blocking SK channels activity with a selective antagonist, dequalinium decreased the amplitude of AHP and increased SS firing rate. Moreover, we found repeated CF stimulation at 1 Hz induced a significant decrease in the spontaneous firing rate of SS, and accompanied with an increase in CV of SS in cerebellar slices, which was also abolished by dequalinium. These results indicated that the spontaneous CF discharge contributed to decreasing SS firing rate via activation of SK channels in the cerebellar PCs in vivo in mice.
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Affiliation(s)
- Xian-Hua Jin
- Key Laboratory of Cellular Function and Pharmacology of Jilin Province, Yanbian UniversityYanji, China.,Department of Neurology, Affiliated Hospital of Yanbian UniversityYanji, China
| | - Hong-Wei Wang
- Key Laboratory of Cellular Function and Pharmacology of Jilin Province, Yanbian UniversityYanji, China.,Department of Endocrinology and Metabolism, Affiliated Zhongshan Hospital of Dalian UniversityDalian, China
| | - Xin-Yuan Zhang
- Key Laboratory of Cellular Function and Pharmacology of Jilin Province, Yanbian UniversityYanji, China.,Department of Physiology and Pathophysiology, College of Medicine, Yanbian UniversityYanji, China
| | - Chun-Ping Chu
- Key Laboratory of Cellular Function and Pharmacology of Jilin Province, Yanbian UniversityYanji, China
| | - Yuan-Zhe Jin
- Key Laboratory of Cellular Function and Pharmacology of Jilin Province, Yanbian UniversityYanji, China.,Department of Physiology and Pathophysiology, College of Medicine, Yanbian UniversityYanji, China
| | - Song-Biao Cui
- Department of Neurology, Affiliated Hospital of Yanbian UniversityYanji, China
| | - De-Lai Qiu
- Key Laboratory of Cellular Function and Pharmacology of Jilin Province, Yanbian UniversityYanji, China.,Department of Physiology and Pathophysiology, College of Medicine, Yanbian UniversityYanji, China
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Zhang GJ, Wu MC, Shi JD, Xu YH, Chu CP, Cui SB, Qiu DL. Ethanol Modulates the Spontaneous Complex Spike Waveform of Cerebellar Purkinje Cells Recorded in vivo in Mice. Front Cell Neurosci 2017; 11:43. [PMID: 28293172 PMCID: PMC5328976 DOI: 10.3389/fncel.2017.00043] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 02/09/2017] [Indexed: 11/18/2022] Open
Abstract
Cerebellar Purkinje cells (PCs) are sensitive to ethanol, but the effect of ethanol on spontaneous complex spike (CS) activity in these cells in vivo is currently unknown. Here, we investigated the effect of ethanol on spontaneous CS activity in PCs in urethane-anesthetized mice using in vivo patch-clamp recordings and pharmacological manipulation. Ethanol (300 mM) induced a decrease in the CS-evoked pause in simple spike (SS) firing and in the amplitude of the afterhyperpolarization (AHP) under current clamp conditions. Under voltage-clamp conditions, ethanol significantly decreased the area under the curve (AUC) and the number of CS spikelets, without changing the spontaneous frequency of the CSs or the instantaneous frequency of the CS spikelets. Ethanol-induced a decrease in the AUC of spontaneous CSs was concentration dependent. The EC50 of ethanol for decreasing the AUC of spontaneous CSs was 168.5 mM. Blocking N-methyl-D-aspartate receptors (NMDARs) failed to prevent the ethanol-induced decreases in the CS waveform parameters. However, blockade of cannabinoid receptor 1 (CB1) significantly suppressed the ethanol-induced effects on the CS-evoked pause in SS firing, amplitude of the AHP, spikelet number and the AUC of CSs. Moreover, a CB1 receptor agonist not only reduced the number of spikelets and the AUC of CSs, but also prevented the ethanol-induced inhibition of CS activity. Our results indicate that ethanol inhibits CS activity via activation of the CB1 receptor in vivo in mice, suggesting that excessive ethanol intake inhibits climbing fiber (CF)–PC synaptic transmission by modulating CB1 receptors in the cerebellar cortex.
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Affiliation(s)
- Guang-Jian Zhang
- Key Laboratory of Cellular Function and Pharmacology of Jilin Province, YanBian UniversityYanji City, China; Department of Pain, Affiliated Hospital of Yanbian UniversityYanji City, China
| | - Mao-Cheng Wu
- Key Laboratory of Cellular Function and Pharmacology of Jilin Province, YanBian UniversityYanji City, China; Department of Osteology, Affiliated Hospital of Yanbian UniversityYanji City, China
| | - Jin-Di Shi
- Key Laboratory of Cellular Function and Pharmacology of Jilin Province, YanBian UniversityYanji City, China; Department of Physiology and Pathophysiology, College of Medicine, Yanbian UniversityYanji City, China
| | - Yin-Hua Xu
- Key Laboratory of Cellular Function and Pharmacology of Jilin Province, YanBian UniversityYanji City, China; Department of Neurology, Affiliated Hospital of Yanbian UniversityYanji City, China
| | - Chun-Ping Chu
- Key Laboratory of Cellular Function and Pharmacology of Jilin Province, YanBian University Yanji City, China
| | - Song-Biao Cui
- Department of Neurology, Affiliated Hospital of Yanbian University Yanji City, China
| | - De-Lai Qiu
- Key Laboratory of Cellular Function and Pharmacology of Jilin Province, YanBian UniversityYanji City, China; Department of Physiology and Pathophysiology, College of Medicine, Yanbian UniversityYanji City, China
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