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Pan W, Chu CP, Qiu DL. Etomidate Depresses Spontaneous Complex Spikes Activity of Cerebellar Purkinje Cells via Cannabinoid 1 Receptor in vivo in Mice. Pharmacology 2023; 108:469-477. [PMID: 37607511 DOI: 10.1159/000531680] [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: 02/09/2023] [Accepted: 06/12/2023] [Indexed: 08/24/2023]
Abstract
INTRODUCTION Complex spikes (CSs) activity of cerebellar Purkinje cells plays critical roles in motor coordination and motor learning by transferring information to cerebellar cortex, which is an accessible and useful model for neurophysiological investigation. Etomidate is an ultrashort-acting nonbarbiturate intravenous anesthetic, which inhibits the spontaneous activity of cerebellar Purkinje cells through activation of GABAA and glycine receptors in vivo in mice. However, the effect of etomidate on the spontaneous CSs activity of cerebellar Purkinje cells in living mouse is not clear. METHODS We here investigated the effects of etomidate on spontaneous CSs activity of cerebellar Purkinje cell in urethane-anesthetized mice by electrophysiology recording technique and pharmacological methods. RESULTS Our results showed that cerebellar surface perfusion of etomidate significantly depressed the activity of spontaneous CSs, which exhibited decreases in the number of spikelets and the area under curve (AUC) of the CSs. The etomidate-produced inhibition of CSs activity was persisted in the presence of GABAA and glycine receptors antagonists. However, application of cannabinoid 1 (CB1) receptor antagonist, AM-251, completely blocked the etomidate-induced inhibition of CSs. Furthermore, application of the CB1 receptor agonist, WIN55212-2, induced a decrease of CSs. Moreover, in the presence of a specific protein kinase A (PKA) inhibitor, KT5720, etomidate failed to produce decreases in the spikelets number and the AUC of the spontaneous CSs. CONCLUSION These results indicate that cerebellar surface application of etomidate facilitates CB1 receptor activity resulting in a depression of spontaneous CSs activity of Purkinje cells via PKA signaling pathway in mouse cerebellar cortex. Our present results suggest that the etomidate administration may impair the function of cerebellar cortical neuronal circuitry by inhibition of the climbing fiber - Purkinje cells synaptic transmission through activation of CB1 receptors in vivo in mice.
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Affiliation(s)
- Wen Pan
- Department of Basic Medical Science, Jiangsu Vocational College of Medicine, Yancheng, China
| | - Chun-Ping Chu
- Department of Physiology, College of Basic Medicine, Jilin Medical University, Jilin City, China
| | - De-Lai Qiu
- Department of Physiology, College of Basic Medicine, Jilin Medical University, Jilin City, China
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Liu PF, Wang Y, Zhang R, Xu L, Li JB, Mu D. Propofol modulates inhibitory inputs in paraventricular thalamic nucleus of mice. Neurosci Lett 2021; 756:135950. [PMID: 33979698 DOI: 10.1016/j.neulet.2021.135950] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 04/11/2021] [Accepted: 05/07/2021] [Indexed: 11/19/2022]
Abstract
The mechanisms of general anaesthetics such as propofol have drawn substantial attention. The effects of propofol on inhibitory postsynaptic currents are not exactly the same in different brain nuclei. Recent studies revealed that the paraventricular thalamic nucleus (PVT) is a critical nucleus modulating wakefulness. However, the effects of propofol on PVT neurons and the mechanisms underlying such effects remain unknown. Here, we performed the whole-cell recording of the PVT neurons in acute brain slices and bath application of propofol. We found that propofol hyperpolarized the membrane potentials of the PVT neurons and suppressed the action potentials induced by step-current injection. Propofol did not affect the spontaneous inhibitory postsynaptic currents (sIPSCs) amplitude or frequency, but prolonged the sIPSCs half-width. Besides, propofol increased miniature inhibitory synaptic currents (mIPSCs) frequency and half-width. Furthermore, propofol could induce GABAA receptors-mediated tonic inhibitory currents dose-dependently. Thus, our results demonstrate that propofol hyperpolarizes PVT neurons by modulating inhibitory currents via GABAA receptors in mice.
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Affiliation(s)
- Peng-Fei Liu
- Department of Anesthesiology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yan Wang
- Department of Anesthesiology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Rui Zhang
- Department of Anesthesiology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Ling Xu
- Department of Anesthesiology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jin-Bao Li
- Department of Anesthesiology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
| | - Di Mu
- Department of Anesthesiology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
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Alipour M, Asl MK, Khordad E, Alipour F, Raoofi A, Ebrahimzadeh-Bideskan A, Ebrahimi V. Histopathological study on neuroapoptotic alterations induced by etomidate in rat hippocampus. Acta Histochem 2021; 123:151693. [PMID: 33601320 DOI: 10.1016/j.acthis.2021.151693] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 01/12/2021] [Accepted: 01/29/2021] [Indexed: 11/19/2022]
Abstract
In human, there is substantial neurogenesis in the hippocampus that is implicated in memory formation and learning. These new-born neurons can be affected by neuropathological conditions. Anesthesia and surgical procedures are associated with postoperative cognitive changes particularly, impaired memory and learning. Therefore, the aim of this study was to evaluate the possible neurodegenerative effects of etomidate in rat hippocampus. Thirty male Wistar rats weighing 250 ± 30 g were randomly divided into 3 groups: 1) Etomidate group; four times 20 mg intraperitoneal injection with 1-h intervals, 2) Control group; the equal volume of normal saline, and 3) Normal group; without any intervention. 6 h after the last injection, the brains were removed and processed according to routine histological methods. TUNEL assay and toluidine blue staining were performed to evaluate neuro-histopathological changes in different regions of hippocampus. Our results showed that the number of TUNEL positive cells and dark neurons (DNs) in etomidate group were significantly higher in the CA1, CA2, CA3, and dentate gyrus (DG) of hippocampus compared with the control and normal groups (p < 0.05). While, there was no significant difference between the various regions of hippocampus in control and normal groups. Our findings showed that etomidate can increase apoptotic cells and dark neurons induction in different regions of hippocampus mainly in DG.
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Affiliation(s)
- Mohammad Alipour
- Department of Anesthesia, School of Medicine, Ghaem Hospital, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mina Kamkar Asl
- Department of Anesthesia, School of Medicine, Ghaem Hospital, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Elnaz Khordad
- Department of Physiology, School of Paramedical Sciences, Torbat Heydariyeh University of Medical Sciences, Torbat Heydariyeh, Iran; Neuroscience Research Center, Torbat Heydariyeh University of Medical Sciences, Torbat Heydariyeh, Iran
| | - Fatemeh Alipour
- Department of Anatomy and Cell Biology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Amir Raoofi
- Leishmaniasis Research Center, Sabzevar University of Medical Sciences, Sabzevar, Iran; Department of Anatomy, Faculty of Medicine, Sabzevar University of Medical Sciences, Sabzevar, Iran
| | - Alireza Ebrahimzadeh-Bideskan
- Department of Anatomy and Cell Biology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran; Applied Biomedical Research Center, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
| | - Vahid Ebrahimi
- Department of Anatomy and Cell Biology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
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Yang C, Li C, Sun J, Lu X. Role of estradiol in mediation of etomidate-caused seizure-like activity in neonatal rats. Int J Dev Neurosci 2019; 78:170-177. [PMID: 31202866 DOI: 10.1016/j.ijdevneu.2019.06.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 05/19/2019] [Accepted: 06/12/2019] [Indexed: 10/26/2022] Open
Abstract
BACKGROUND The goal of this study was to investigate the effect of estradiol in mediation of electroencephalogram (EEG) abnormality induced by etomidate in neonatal rats. METHODS Sprague-Dawley rats were anesthetized using intraperitoneal etomidate for 2 h on postnatal days (P) 4, 5, or 6 and recorded electroencephalogram in two ways. First, pups were recorded EEG two and a half hours under etomidate anesthesia, in subgroups, estradiol receptor antagonist ICI182780 and estradiol synthase inhibitor formestane were given subcutaneously in male rats 15 min prior to etomidate. Second, pups were anesthetized with etomidate for 2 h on P4,5 or 6 and then recovered from anesthesia, EEG were recorded for one hour in two postnatal periods of P9-P11 and P14-P16. Subgroup rats that received bumetanide, NKCC1 inhibitor, to test the NKCC1-GABAAR signaling effect on neonatal brain development, negative control groups and maternally separated for 2 h on P4, 5, or 6 were studied in 16 groups. Each group's n was = 8. RESULTS Male pups showed more severe seizure-like activities than female pups in P4-P6 under etomidate anesthesia. Pups pretreated with ICI182780 and formestane showed a less abnormalities of EEG in male rats. Etomidate caused seizure-like activity in P4-P6 could extend to P9-P11, but not seen in P14-P16, Pretreated with bumetanide only alleviated abnormalities in male pups other than female in P9-P11. CONCLUSIONS Estradiol involves in the NKCC1-GABAAR mediated seizure-like activity caused by etomidte in neonatal rats and these the abnormality lasts near two weeks.
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Affiliation(s)
- Chunyao Yang
- Department of Anesthesiology, Affiliated Cancer Hospital of Zhengzhou University, Henan Cancer Hospital, Zhengzhou, China
| | - Changsheng Li
- Department of Anesthesiology, Affiliated Cancer Hospital of Zhengzhou University, Henan Cancer Hospital, Zhengzhou, China
| | - Jing Sun
- Department of Psychiatry, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Xihua Lu
- Department of Anesthesiology, Affiliated Cancer Hospital of Zhengzhou University, Henan Cancer Hospital, Zhengzhou, China
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Zhao Y, Zhang H. Propofol and sevoflurane combined with remifentanil on the pain index, inflammatory factors and postoperative cognitive function of spine fracture patients. Exp Ther Med 2018; 15:3775-3780. [PMID: 29563982 PMCID: PMC5858115 DOI: 10.3892/etm.2018.5898] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 01/11/2018] [Indexed: 12/27/2022] Open
Abstract
The effects of propofol vs. sevoflurane combined with remifentanil on the pain index, inflammatory factors and postoperative cognitive function in spine fracture patients were studied and analyzed. A total of 62 patients with vertebral fracture were randomly divided into the propofol group (P group, n=41) and the sevoflurane group (S group, n=41). P group used induction anesthesia with propofol, and maintained anesthesia via intravenous injection of remifentanil. While patients in S group received induction anesthesia with sevoflurane, and also remifentanil as the maintained anesthesia. Results showed that extubation time, eye-opening time and response time of P group were lower than S group (p<0.05). The VAS score 48 h after surgery in P group was significantly lower than the S group (p<0.05). Levels of IL-6, IL-1β, ICAM-1 and MMP-9 in serum in P group were lower than those in S group (p<0.05). Mini-mental state examination (MMSE) score 24 h after surgery in P group was higher than that in S group (p<0.01). Compared with sevoflurane anesthesia, propofol combined with remifentanil anesthesia on spine fracture patients can significantly decrease the pain index and inflammatory reaction, shorten the postoperative recovery time.
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Affiliation(s)
- Yu Zhao
- Department of Anesthesiology, Jining First People's Hospital, Jining, Shandong 272011, P.R. China
| | - Hongqi Zhang
- Department of Anesthesiology, Jining First People's Hospital, Jining, Shandong 272011, P.R. China
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Al-Muhtasib N, Sepulveda-Rodriguez A, Vicini S, Forcelli PA. Neonatal phenobarbital exposure disrupts GABAergic synaptic maturation in rat CA1 neurons. Epilepsia 2018; 59:333-344. [PMID: 29315524 DOI: 10.1111/epi.13990] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/05/2017] [Indexed: 01/24/2023]
Abstract
OBJECTIVE Phenobarbital is the most commonly utilized drug for the treatment of neonatal seizures. The use of phenobarbital continues despite growing evidence that it exerts suboptimal seizure control and is associated with long-term alterations in brain structure, function, and behavior. Alterations following neonatal phenobarbital exposure include acute induction of neuronal apoptosis, disruption of synaptic development in the striatum, and a host of behavioral deficits. These behavioral deficits include those in learning and memory mediated by the hippocampus. However, the synaptic changes caused by acute exposure to phenobarbital that lead to lasting effects on brain function and behavior remain understudied. METHODS Postnatal day (P)7 rat pups were treated with phenobarbital (75 mg/kg) or saline. On P13-14 or P29-37, acute slices were prepared and whole-cell patch-clamp recordings were made from CA1 pyramidal neurons. RESULTS At P14 we found an increase in miniature inhibitory postsynaptic current (mIPSC) frequency in the phenobarbital-exposed as compared to the saline-exposed group. In addition to this change in mIPSC frequency, the phenobarbital group displayed larger bicuculline-sensitive tonic currents, decreased capacitance and membrane time constant, and a surprising persistence of giant depolarizing potentials. At P29+, the frequency of mIPSCs in the saline-exposed group had increased significantly from the frequency at P14, typical of normal synaptic development; at this age the phenobarbital-exposed group displayed a lower mIPSC frequency than did the control group. Spontaneous inhibitory postsynaptic current (sIPSC) frequency was unaffected at either P14 or P29+. SIGNIFICANCE These neurophysiological alterations following phenobarbital exposure provide a potential mechanism by which acute phenobarbital exposure can have a long-lasting impact on brain development and behavior.
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Affiliation(s)
- Nour Al-Muhtasib
- Department of Pharmacology and Physiology, Georgetown University, Washington, DC, USA
| | - Alberto Sepulveda-Rodriguez
- Department of Pharmacology and Physiology, Georgetown University, Washington, DC, USA.,Interdisciplinary Program in Neuroscience, Georgetown University, Washington, DC, USA
| | - Stefano Vicini
- Department of Pharmacology and Physiology, Georgetown University, Washington, DC, USA.,Interdisciplinary Program in Neuroscience, Georgetown University, Washington, DC, USA.,Department of Neuroscience, Georgetown University, Washington, DC, USA
| | - Patrick A Forcelli
- Department of Pharmacology and Physiology, Georgetown University, Washington, DC, USA.,Interdisciplinary Program in Neuroscience, Georgetown University, Washington, DC, USA.,Department of Neuroscience, Georgetown University, Washington, DC, USA
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