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Ballon Romero SS, Fuh LJ, Hung SY, Lee YC, Huang YC, Chien SY, Chen YH. Electroacupuncture exerts prolonged analgesic and neuroprotective effects in a persistent dental pain model induced by multiple dental pulp injuries: GABAergic interneurons-astrocytes interaction. Front Immunol 2023; 14:1213710. [PMID: 37954604 PMCID: PMC10639134 DOI: 10.3389/fimmu.2023.1213710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Accepted: 10/03/2023] [Indexed: 11/14/2023] Open
Abstract
Pain within the trigeminal system, particularly dental pain, is poorly understood. This study aimed to determine whether single or multiple dental pulp injuries induce persistent pain, its association with trigeminal central nociceptive pathways and whether electroacupuncture (EA) provides prolonged analgesic and neuroprotective effects in a persistent dental pain model. Models of single dental pulp injury (SDPI) and multiple dental pulp injuries (MDPI) were used to induce trigeminal neuropathic pain. The signs of dental pain-related behavior were assessed using the mechanical head withdrawal threshold (HWT). Immunofluorescence and western blot protocols were used to monitor astrocyte activation, changes in apoptosis-related proteins, and GABAergic interneuron plasticity. SDPI mice exhibited an initial marked decrease in HWT from days one to 14, followed by progressive recovery from days 21 to 42. From days 49 to 70, the HWT increased and returned to the control values. In contrast, MDPI mice showed a persistent decrease in HWT from days one to 70. MDPI increased glial fibrillary acidic protein (GFAP) and decreased glutamine synthetase (GS) and glutamate transporter-1 (GLT1) expression in the Vi/Vc transition zone of the brainstem on day 70, whereas no changes in astrocytic markers were observed on day 70 after SDPI. Increased expression of cleaved cysteine-aspartic protease-3 (cleaved caspase-3) and Bcl-2-associated X protein (Bax), along with decreased B-cell lymphoma/leukemia 2 (Bcl-2), were observed at day 70 after MDPI but not after SDPI. The downregulation of glutamic acid decarboxylase (GAD65) expression was observed on day 70 only after MDPI. The effects of MDPI-induced lower HWT from days one to 70 were attenuated by 12 sessions of EA treatment (days one to 21 after MDPI). Changes in astrocytic GFAP, GS, and GLT-1, along with cleaved caspase-3, Bax, Bcl-2, and GAD65 expression observed 70 days after MDPI, were reversed by EA treatment. The results suggest that persistent dental pain in mice was induced by MDPI but not by SDPI. This effect was associated with trigeminal GABAergic interneuron plasticity along with morphological and functional changes in astrocytes. EA exerts prolonged analgesic and neuroprotective effects that might be associated with the modulation of neuron-glia crosstalk mechanisms.
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Affiliation(s)
| | - Lih-Jyh Fuh
- School of Dentistry, College of Dentistry, China Medical University, Taichung, Taiwan
| | - Shih-Ya Hung
- Graduate Institute of Acupuncture Science, China Medical University, Taichung, Taiwan
- Division of Surgery, Department of Medical Research, China Medical University Hospital, Taichung, Taiwan
| | - Yu-Chen Lee
- Graduate Institute of Acupuncture Science, China Medical University, Taichung, Taiwan
- Department of Acupuncture, China Medical University Hospital, Taichung, Taiwan
| | - Yu-Chuen Huang
- Department of Medical Research, China Medical University Hospital, School of Chinese Medicine, China Medical University, Taichung, Taiwan
| | - Szu-Yu Chien
- Graduate Institute of Acupuncture Science, China Medical University, Taichung, Taiwan
| | - Yi-Hung Chen
- Graduate Institute of Acupuncture Science, China Medical University, Taichung, Taiwan
- Chinese Medicine Research Center, China Medical University, Taichung, Taiwan
- Department of Photonics and Communication Engineering, Asia University, Taichung, Taiwan
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Liu S, Cheng H, Cui L, Jin L, Li Y, Zhu C, Ji Q, Tang J. Astrocytic purinergic signalling contributes to the development and maintenance of neuropathic pain via modulation of glutamate release. J Neurochem 2023. [PMID: 36869630 DOI: 10.1111/jnc.15800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 02/20/2023] [Accepted: 02/23/2023] [Indexed: 03/05/2023]
Abstract
Although activation of astrocytes is critical in developing neuropathic pain (NP) following nerve injury, the underlying mechanisms of NP and therapeutic management for NP are still vague. Importantly, the decreases in the levels of astrocytic glutamate transporter-1 (GLT-1) in the spinal dorsal horn result in enhanced excitatory transmission and cause persistent pain. P2Y1 purinergic receptor (P2Y1R) has been shown to enhance many inflammatory processes. The up-regulated expression of astrocytic P2Y1R is crucial to participate in pain transduction under conditions of nerve injury and peripheral inflammation considering that P2Y1R is potentially involved in glutamate release and synaptic transmission. This study indicates that the expression of P2Y1R in the spinal cord was increased accompanied by the activation of A1 phenotype astrocytes in the rat model of spinal nerve ligation (SNL). Astrocyte-specific knockdown of P2Y1R alleviated SNL-induced nociceptive responses and mitigated A1 reactive astrocytes, which subsequently increased GLT-1 expression. Conversely, in naïve rats, P2Y1R over-expression induced a canonical NP-like phenotype and spontaneous hypernociceptive responses and increased the concentration of glutamate in the spinal dorsal horn. Besides, our in vitro data showed that the proinflammatory cytokine tumour necrosis factor-alpha contributes to A1/A2 astrocyte reactivity and Ca2+ -dependent release of glutamate. Conclusively, our results provide novel insights that as a significant regulator of astrocytic A1/A2 polarization and neuroinflammation, P2Y1R may represent a potential target for the treatment of SNL-induced NP.
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Affiliation(s)
- Suting Liu
- Department of Anesthesiology, Jinling Hospital, Medical School of Nanjing University, Nanjing, PR China
| | - Hao Cheng
- Department of Anesthesiology, Jinling Hospital, Medical School of Nanjing University, Nanjing, PR China
| | - Liying Cui
- Department of Anesthesiology, Jinling Hospital, Medical School of Nanjing University, Nanjing, PR China
| | - Li Jin
- Department of Anesthesiology, Jinling Hospital, Medical School of Nanjing University, Nanjing, PR China
| | - Yunzi Li
- Department of Neurology, Jinling Hospital, Medical School of Nanjing University, Nanjing, PR China
| | - Chao Zhu
- Department of Spine Surgery, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, PR China
| | - Qing Ji
- Department of Anesthesiology, Jinling Hospital, Medical School of Nanjing University, Nanjing, PR China
| | - Jun Tang
- Department of Anesthesiology, Jinling Hospital, Medical School of Nanjing University, Nanjing, PR China
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Yuan Y, Zhao Y, Shen M, Wang C, Dong B, Xie K, Yu Y, Yu Y. Spinal NLRP3 inflammasome activation mediates IL-1β release and contributes to remifentanil-induced postoperative hyperalgesia by regulating NMDA receptor NR1 subunit phosphorylation and GLT-1 expression in rats. Mol Pain 2022; 18:17448069221093016. [PMID: 35322721 PMCID: PMC9703502 DOI: 10.1177/17448069221093016] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Trafficking and activation of N-methyl-D-aspartate (NMDA) receptors play an important role in initiating and maintaining postoperative remifentanil-induced hyperalgesia (RIH). Activation of the NOD-like receptor protein 3 (NLRP3) inflammasome has been linked to the development of inflammatory and neuropathic pain. We hypothesized that activation of NLRP3 inflammasome mediates IL-1β release and contributes to RIH in rats by increasing NMDA receptor NR1 (NR1) subunit phosphorylation and decreasing glutamate transporter-1 (GLT-1) expression. METHODS Acute exposure to remifentanil (1.2 μg/kg/min for 60 min) was used to establish RIH in rats. Thermal and mechanical hyperalgesia were tested at baseline (24 h before remifentanil infusion) and 2, 6, 24, and 48 h after remifentanil infusion. The levels of IL-1β, GLT-1, phosphorylated NR1 (phospho-NR1), and NLRP3 inflammasome activation indicators [NLRP3, Toll-like receptor 4 (TLR4), P2X purinoceptor 7 (P2X7R), and caspase-1] were measured after the last behavioral test. A selective IL-1β inhibitor (IL-1β inhibitor antagonist; IL-1ra) or three different selective NLRP3 inflammasome activation inhibitors [(+)-naloxone (a TLR4 inhibitor), A438079 (a P2X7R inhibitor), or ac-YVADcmk (a caspase-1 inhibitor)] were intrathecally administered immediately before remifentanil infusion into rats. RESULTS Remifentanil induced significant postoperative hyperalgesia, increased IL-1β and phospho-NR1 levels and activated the NLRP3 inflammasome by increasing TLR4, P2X7R, NLRP3, and caspase-1 expression, but it decreased GLT-1 expression in the L4-L6 spinal cord segments of rats, which was markedly improved by intrathecal administration of IL-1ra, (+)-naloxone, A438079, or ac-YVADcmk. CONCLUSION NLRP3 inflammasome activation mediates IL-1β release and contributes to RIH in rats by inducing NMDA receptor NR1 subunit phosphorylation and decreasing GLT-1 expression. Inhibiting the activation of the NLRP3 inflammasome may be an effective treatment for RIH.
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Affiliation(s)
- Yuan Yuan
- Department of Anesthesia, Tianjin Medical University General Hospital, Tianjin, China,Tianjin Institute of Anesthesiology, Tianjin, P.R. China
| | - Yue Zhao
- Department of Anesthesia, Tianjin Medical University General Hospital, Tianjin, China,Tianjin Institute of Anesthesiology, Tianjin, P.R. China
| | - Mengxi Shen
- Department of Anesthesia, Tianjin Medical University General Hospital, Tianjin, China,Tianjin Institute of Anesthesiology, Tianjin, P.R. China
| | - Chenxu Wang
- Department of Anesthesia, Tianjin Medical University General Hospital, Tianjin, China,Tianjin Institute of Anesthesiology, Tianjin, P.R. China
| | - Beibei Dong
- Department of Anesthesia, Tianjin Medical University General Hospital, Tianjin, China,Tianjin Institute of Anesthesiology, Tianjin, P.R. China
| | - Keliang Xie
- Department of Anesthesia, Tianjin Medical University General Hospital, Tianjin, China,Tianjin Institute of Anesthesiology, Tianjin, P.R. China
| | - Yang Yu
- Department of Anesthesia, Tianjin Medical University General Hospital, Tianjin, China,Tianjin Institute of Anesthesiology, Tianjin, P.R. China,Yang Yu, Department of Anesthesia, Tianjin Medical University General Hospital, 154 Anshan Road, Tianjin 300052, P.R. China.
| | - Yonghao Yu
- Department of Anesthesia, Tianjin Medical University General Hospital, Tianjin, China,Tianjin Institute of Anesthesiology, Tianjin, P.R. China,Yonghao Yu, Department of Anesthesia, Tianjin Medical University General Hospital, 154 Anshan Road, Tianjin 300052, P.R. China.
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Lin CL, Zheng TL, Tsou SH, Chang HM, Tseng LH, Yu CH, Hung CS, Ho YJ. Amitriptyline Improves Cognitive and Neuronal Function in a Rat Model that Mimics Dementia with Lewy Bodies. Behav Brain Res 2022; 435:114035. [PMID: 35926562 DOI: 10.1016/j.bbr.2022.114035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 07/09/2022] [Accepted: 07/28/2022] [Indexed: 11/19/2022]
Abstract
Dementia with Lewy bodies (DLB), a highly prevalent neurodegenerative disorder, causes motor and cognitive deficits. The main pathophysiologies of DLB are glutamate excitotoxicity and accumulation of Lewy bodies comprising α-synuclein (α-syn) and β-amyloid (Aβ). Amitriptyline (AMI) promotes expression of glutamate transporter-1 and glutamate reuptake. In this study, we measured the effects of AMI on behavioral and neuronal function in a DLB rat model. We used rivastigmine (RIVA) as a positive control. To establish the DLB rat model, male Wistar rats were stereotaxically injected with recombinant adenoassociated viral vector with the SNCA gene (10μg/10μL) and Aβ (5μg/2.5μL) into the left ventricle and prefrontal cortex, respectively. AMI (10mg/kg/day, i.p.), RIVA (2mg/kg/day, i.p.), or saline was injected intraperitoneally after surgery. From the 29th day, behavioral tests were performed to evaluate the motor and cognitive functions of the rats. Immunohistochemical staining was used to assess neuronal changes. We measured the α-syn level, number of newborn cells, and neuronal density in the hippocampus and in the nigrostriatal dopaminergic system. The DLB group exhibited deficit in object recognition. Both the AMI and RIVA treatments reversed these deficits. Histologically, the DLB rats exhibited cell loss in the substantia nigra pars compacta and in the hippocampal CA1 area. AMI reduced this cell loss, but RIVA did not. In addition, the DLB rats exhibited a lower number of newborn cells and higher α-syn levels in the dentate gyrus (DG). AMI did not affect α-syn accumulation but recovered neurogenesis in the DG of the rats, whereas RIVA reversed the α-syn accumulation but did not affect neurogenesis in the rats. We suggest that AMI may have potential for use in the treatment of DLB.
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Affiliation(s)
- Chih-Li Lin
- Institute of Medicine, Department of Medical Research, Chung Shan Medical University Hospital, Chung Shan Medical University, Taichung 40201, Taiwan, ROC
| | - Ting-Lin Zheng
- Department of Psychology, Chung Shan Medical University Hospital, Chung Shan Medical University, Taichung 40201, Taiwan, ROC
| | - Sing-Hua Tsou
- Institute of Medicine, Department of Medical Research, Chung Shan Medical University Hospital, Chung Shan Medical University, Taichung 40201, Taiwan, ROC
| | - Hung-Ming Chang
- Department of Anantomy and Cell Biology, School of Medicine, College of Medicine, Taipei Medical University, Taipei 110, Taiwan, ROC
| | - Li-Ho Tseng
- Graduate School of Environmental Management, Tajen University, Pingtung 907, Taiwan, ROC
| | - Ching-Han Yu
- Department of Pysiology, School of Medicine, Chung Shan Medical University Hospital, Chung Shan Medical University, Taichung 40201, Taiwan, ROC.
| | - Ching-Sui Hung
- Occupational Safety and Health Office, Taipei City Hospital, Taipei 10581, Taiwan, ROC.
| | - Ying-Jui Ho
- Department of Psychology, Chung Shan Medical University Hospital, Chung Shan Medical University, Taichung 40201, Taiwan, ROC.
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Nakatsuka K, Matsuoka Y, Kurita M, Wang R, Tsuboi C, Sue N, Kaku R, Morimatsu H. Intrathecal Administration of the α1 Adrenergic Antagonist Phentolamine Upregulates Spinal GLT-1 and Improves Mirror Image Pain in SNI Model Rats. Acta Med Okayama 2022; 76:255-263. [PMID: 35790355 DOI: 10.18926/amo/63719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Mirror image pain (MIP) is a type of extraterritorial pain that results in contralateral pain or allodynia. Glutamate transporter-1 (GLT-1) is expressed in astrocytes and plays a role in maintaining low glutamate levels in the synaptic cleft. Previous studies have shown that GLT-1 dysfunction induces neuropathic pain. Our previous study revealed bilateral GLT-1 downregulation in the spinal cord of a spared nerve injury (SNI) rat. We hypothesized that spinal GLT-1 is involved in the mechanism of MIP. We also previously demonstrated noradrenergic GLT-1 regulation. Therefore, this study aimed to investigate the effect of an α1 adrenergic antagonist on the development of MIP. Rats were subjected to SNI. Changes in pain behavior and GLT-1 protein levels in the SNI rat spinal cords were then examined by intrathecal administration of the α1 adrenergic antagonist phentolamine, followed by von Frey test and western blotting. SNI resulted in the development of MIP and bilateral downregulation of GLT-1 protein in the rat spinal cord. Intrathecal phentolamine increased contralateral GLT-1 protein levels and partially ameliorated the 50% paw withdrawal threshold in the contralateral hind paw. Spinal GLT-1 upregulation by intrathecal phentolamine ameliorates MIP. GLT-1 plays a role in the development of MIPs.
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Affiliation(s)
- Kosuke Nakatsuka
- Department of Anesthesiology and Resuscitology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
| | - Yoshikazu Matsuoka
- Department of Anesthesiology and Resuscitology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
| | | | - Ruilin Wang
- Department of Anesthesiology and Resuscitology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
| | - Chika Tsuboi
- Department of Anesthesiology and Resuscitology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
| | - Nobutaka Sue
- Department of Anesthesiology and Resuscitology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
| | - Ryuji Kaku
- Department of Anesthesiology and Resuscitology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
| | - Hiroshi Morimatsu
- Department of Anesthesiology and Resuscitology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
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Zeng X, Dong X, Xiao Q, Yao J. Vitamin C Inhibits Ubiquitination of Glutamate Transporter 1 (GLT-1) in Astrocytes by Downregulating HECTD1. ACS Chem Neurosci 2022; 13:676-687. [PMID: 35148069 DOI: 10.1021/acschemneuro.1c00845] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Excitatory neurotoxicity caused by the accumulation of glutamate in the synaptic cleft is an important cause of Parkinson's disease (PD). Astrocyte glutamate transporter 1 (GLT-1) is the main transporter responsible for transporting glutamate, and investigations toward the regulation of GLT-1 in astrocytes can reveal important insights. Vitamin C (VC) has important protective effects on the brain, but its effect on the regulation of GLT-1 expression is unclear. The purpose of this study was to explore any regulatory effect of VC on GLT-1 expression in astrocytes and to clarify the possible mechanism of such regulation. We found that GLT-1 expression was impaired in 1-methyl-4-phenylpyridinium iodide (MPP+)-treated astrocytes, and the transport capacity for glutamate was significantly reduced. Pretreatment with VC restored the GLT-1 expression in the MPP+-treated astrocytes. Intraperitoneal VC administration in a PD murine model confirmed that GLT-1 expression was restored in midbrain tissue. The VC-dependent rescue of GLT-1 expression in the MPP+-treated astrocytes was shown to be due to inhibition of GLT-1 ubiquitination. Transcriptome sequence analysis revealed a number of differentially expressed genes as a result of VC treatment on MPP+-treated astrocytes, including the downregulation of HECT Domain E3 ubiquitin protein ligase 1 (Hectd1). After knocking down Hectd1, the impaired GLT-1 expression caused by MPP+ was alleviated, while overexpression of Hectd1 significantly reduced the expression of GLT-1. After overexpression of Hectd1, VC could no longer increase GLT-1 expression of MPP+-treated astrocytes, indicating that HECTD1 is essential for VC regulation of GLT-1. Thus, VC reduces the ubiquitination of GLT-1 in astrocytes by inhibiting the expression of HECTD1. Our findings have identified a novel mechanism by which VC regulates the expression of GLT-1 in astrocytes.
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Affiliation(s)
- Xiaokang Zeng
- Central Laboratory, Shunde Hospital, Southern Medical University (The First People’s Hospital of Shunde Foshan), Foshan, 528300 Guangdong, China
| | - Xinhuai Dong
- Central Laboratory, Shunde Hospital, Southern Medical University (The First People’s Hospital of Shunde Foshan), Foshan, 528300 Guangdong, China
| | - Qiang Xiao
- Pulmonary and Critical Care Medicine, Shunde Hospital, Southern Medical University (The First People’s Hospital of Shunde Foshan), Foshan, 528300 Guangdong, China
| | - Jie Yao
- Central Laboratory, Shunde Hospital, Southern Medical University (The First People’s Hospital of Shunde Foshan), Foshan, 528300 Guangdong, China
- Department of Laboratory Medicine, Shunde Hospital, Southern Medical University (The First People’s Hospital of Shunde, Foshan), Foshan, 528300 Guangdong, China
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Saeedi N, Darvishmolla M, Tavassoli Z, Davoudi S, Heysieattalab S, Hosseinmardi N, Janahmadi M, Behzadi G. The role of hippocampal glial glutamate transporter (GLT-1) in morphine-induced behavioral responses. Brain Behav 2021; 11:e2323. [PMID: 34363739 PMCID: PMC8442590 DOI: 10.1002/brb3.2323] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2021] [Revised: 07/18/2021] [Accepted: 07/19/2021] [Indexed: 11/07/2022] Open
Abstract
Opioid abuse modifies synaptic plasticity, which leads to behavioral changes, such as morphine dependence, but the mechanism remains poorly understood. Glial cells play an important role in the modulation of synaptic plasticity and are involved in addictive-like behaviors. The indisputable role of glutamate in opiate addiction has been shown. Astrocytes, a type of glial cells, which are integral functional elements of synapses, modulate the concentration of glutamate in the synaptic space. One of the most important mechanisms for glutamate concentration regulation is its uptake from the synaptic cleft. In this study, we evaluated the role of hippocampal glial glutamate transporter (GLT-1) in morphine dependence. Male rats received subcutaneous (s.c.) morphine sulfate (10 mg/kg) at an interval of 12 h for 9 days. In order to activate GLT-1, animals received an intrahippocampal injection of ceftriaxone (0.5 mmol/0.5 μl) in the CA1 region of the hippocampus, 30 min before each morphine administration. Rats were assessed for morphine dependence by monitoring naloxone hydrochloride-induced morphine withdrawal. Our results showed that hippocampal microinjection of ceftriaxone, as an activator of GLT-1, reduced some signs of morphine withdrawal, such as activity, diarrhea, head tremor, freezing, and ptosis. It seems that hippocampal GLT-1 can be affected by chronic morphine administration and involved in morphine dependence. Therefore, its activation may reduce morphine side effects by reducing hippocampal glutamate.
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Affiliation(s)
- Negin Saeedi
- Department of PhysiologyMedical SchoolShahid Beheshti University of Medical SciencesTehranIran
- Neuroscience Research CenterShahid Beheshti University of Medical SciencesTehranIran
| | - Mahgol Darvishmolla
- Department of PhysiologyMedical SchoolShahid Beheshti University of Medical SciencesTehranIran
- Neuroscience Research CenterShahid Beheshti University of Medical SciencesTehranIran
| | - Zohreh Tavassoli
- Department of PhysiologyMedical SchoolShahid Beheshti University of Medical SciencesTehranIran
- Neuroscience Research CenterShahid Beheshti University of Medical SciencesTehranIran
| | - Shima Davoudi
- Department of PhysiologyMedical SchoolShahid Beheshti University of Medical SciencesTehranIran
| | | | - Narges Hosseinmardi
- Department of PhysiologyMedical SchoolShahid Beheshti University of Medical SciencesTehranIran
- Neuroscience Research CenterShahid Beheshti University of Medical SciencesTehranIran
| | - Mahyar Janahmadi
- Department of PhysiologyMedical SchoolShahid Beheshti University of Medical SciencesTehranIran
- Neuroscience Research CenterShahid Beheshti University of Medical SciencesTehranIran
| | - Gila Behzadi
- Department of PhysiologyMedical SchoolShahid Beheshti University of Medical SciencesTehranIran
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Kimura A, Suehiro K, Mukai A, Fujimoto Y, Funao T, Yamada T, Mori T. Protective effects of hydrogen gas against spinal cord ischemia-reperfusion injury. J Thorac Cardiovasc Surg 2021; 164:e269-e283. [PMID: 34090694 DOI: 10.1016/j.jtcvs.2021.04.077] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 04/02/2021] [Accepted: 04/17/2021] [Indexed: 10/21/2022]
Abstract
OBJECTIVE This experimental study aimed to assess the efficacy of hydrogen gas inhalation against spinal cord ischemia-reperfusion injury and reveal its mechanism by measuring glutamate concentration in the ventral horn using an in vivo microdialysis method. METHODS Male Sprague-Dawley rats were divided into the following 6 groups: sham, only spinal ischemia, 3% hydrogen gas (spinal ischemia + 3% hydrogen gas), 2% hydrogen gas (spinal ischemia + 2% hydrogen gas), 1% hydrogen gas (spinal ischemia + 1% hydrogen gas), and hydrogen gas dihydrokainate (spinal ischemia + dihydrokainate [selective inhibitor of glutamate transporter-1] + 3% hydrogen gas). Hydrogen gas inhalation was initiated 10 minutes before the ischemia. For the hydrogen gas dihydrokainate group, glutamate transporter-1 inhibitor was administered 20 minutes before the ischemia. Immunofluorescence was performed to assess the expression of glutamate transporter-1 in the ventral horn. RESULTS The increase in extracellular glutamate induced by spinal ischemia was significantly suppressed by 3% hydrogen gas inhalation (P < .05). This effect was produced in increasing order: 1%, 2%, and 3%. Conversely, the preadministration of glutamate transporter-1 inhibitor diminished the suppression of spinal ischemia-induced glutamate increase observed during the inhalation of 3% hydrogen gas. Immunofluorescence indicated the expression of glutamate transporter-1 in the spinal ischemia group was significantly decreased compared with the sham group, which was attenuated by 3% hydrogen gas inhalation (P < .05). CONCLUSIONS Our study demonstrated hydrogen gas inhalation exhibits a protective and concentration-dependent effect against spinal ischemic injury, and glutamate transporter-1 has an important role in the protective effects against spinal cord injury.
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Affiliation(s)
- Aya Kimura
- Department of Anesthesiology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Koichi Suehiro
- Department of Anesthesiology, Osaka City University Graduate School of Medicine, Osaka, Japan.
| | - Akira Mukai
- Department of Anesthesiology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Yohei Fujimoto
- Department of Anesthesiology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Tomoharu Funao
- Department of Anesthesiology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Tokuhiro Yamada
- Department of Anesthesiology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Takashi Mori
- Department of Anesthesiology, Osaka City University Graduate School of Medicine, Osaka, Japan
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Li LL, Ke XY, Jiang C, Qin SQ, Liu YY, Xian XH, Liu LZ, He JC, Chen YM, An HF, Sun N, Hu YH, Wang Y, Zhang LN, Lu QY. Na + , K + -ATPase participates in the protective mechanism of rat cerebral ischemia-reperfusion through the interaction with glutamate transporter-1. Fundam Clin Pharmacol 2021; 35:870-881. [PMID: 33481320 DOI: 10.1111/fcp.12652] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Accepted: 01/19/2021] [Indexed: 11/30/2022]
Abstract
Glutamate excitotoxicity in cerebral ischemia/reperfusion is an important cause of neurological damage. The aim of this study was to investigate the mechanism of Na+, K+-ATPase (NKA) involved in l ow concentration of ouabain (Oua, activating NKA)-induced protection of rat cerebral ischemia-reperfusion injury. The 2,3,5-triphenyltetrazolium chloride (TTC) staining and neurological deficit scores (NDS) were performed to evaluate rat cerebral injury degree respectively at 2 h, 6 h, 1 d and 3 d after reperfusion of middle cerebral artery occlusion (MCAO) 2 h in rats. NKA α1/α2 subunits and glutamate transporter-1 (GLT-1) protein expression were investigated by Western blotting. The cerebral infarct volume ratio were evidently decreased in Oua group vs MCAO/R group at 1 d and 3 d after reperfusion of 2 h MCAO in rats (*p < 0.05 ). Moreover, NDS were not significantly different (p > 0.05 ). NKA α1 was decreased at 6 h and 1 d after reperfusion of 2 h MCAO in rats, and was improved in Oua group. However, NKA α1 and α2 were increased at 3 d after reperfusion of 2 h MCAO in rats, and was decreased in Oua group. GLT-1 was decreased at 6 h, 1 d and 3 d after reperfusion of 2 h MCAO in rats, and was improved in Oua group. These data indicated that l ow concentration of Oua could improve MCAO/R injury through probably changing NKA α1/α2 and GLT-1 protein expression, then increasing GLT-1 function and promoting Glu transport and absorption, which could be useful to determine potential therapeutic strategies for patients with stroke. Low concentration of Oua improved rat MCAO/R injury via NKA α1/α2 and GLT-1.
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Affiliation(s)
- Lin-Lin Li
- Basic Medical College, Hebei Medical University, Hebei, China
| | - Xue-Ying Ke
- Basic Medical College, Hebei Medical University, Hebei, China
| | - Chen Jiang
- Forensic Medical College, Hebei Medical University, Hebei, China
| | - Shi-Qi Qin
- Basic Medical College, Hebei Medical University, Hebei, China
| | - Yang-Yang Liu
- Basic Medical College, Hebei Medical University, Hebei, China
| | - Xiao-Hui Xian
- Department of Pathophysiology, Hebei Medical University, Hebei, China
| | - Li-Zhe Liu
- Department of Pathophysiology, Hebei Medical University, Hebei, China
| | - Jin-Chen He
- Basic Medical College, Hebei Medical University, Hebei, China
| | - Ya-Meng Chen
- Basic Medical College, Hebei Medical University, Hebei, China
| | - Hong-Fei An
- Basic Medical College, Hebei Medical University, Hebei, China
| | - Nan Sun
- Basic Medical College, Hebei Medical University, Hebei, China
| | - Yue-Hua Hu
- Basic Medical College, Hebei Medical University, Hebei, China
| | - Yan Wang
- North China University of Science and Technology Affiliated Hospital, Hebei, China
| | - Li-Nan Zhang
- Department of Pathophysiology, Hebei Medical University, Hebei, China
| | - Qi-Yong Lu
- Department of Neurosurgery, Hengshui Fifth People's Hospital, Hebei, China
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10
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Jeong KH, Cho KO, Lee MY, Kim SY, Kim WJ. Vascular endothelial growth factor receptor-3 regulates astroglial glutamate transporter-1 expression via mTOR activation in reactive astrocytes following pilocarpine-induced status epilepticus. Glia 2020; 69:296-309. [PMID: 32835451 DOI: 10.1002/glia.23897] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 07/19/2020] [Accepted: 07/22/2020] [Indexed: 12/13/2022]
Abstract
Recent evidence has shown that the vascular endothelial growth factor (VEGF) system plays a crucial role in several neuropathological processes. We previously reported an upregulation of VEGF-C and its receptor, VEGFR-3, in reactive astrocytes after the onset of status epilepticus (SE). However, it remains unknown, which molecules act as downstream signals following VEGFR-3 upregulation, and are involved in reactive astrogliosis after SE. Therefore, we investigated whether VEGFR-3 upregulation within reactive astrocytes is associated with the activation of mammalian target of rapamycin (mTOR) signaling, which we confirmed by assaying for the phosphorylated form of S6 protein (pS6), and whether VEGFR-3-mediated mTOR activation induces astroglial glutamate transporter-1 (GLT-1) expression in the hippocampus after pilocarpine-induced SE. We found that spatiotemporal expression of pS6 was consistent with VEGFR-3 expression in the hippocampus after SE, and that both pS6 and VEGFR-3 were highly expressed in SE-induced reactive astrocytes. Treatment with the mTOR inhibitor rapamycin decreased astroglial VEGFR-3 expression and GLT-1 expression after SE. Treatment with a selective inhibitor for VEGFR-3 attenuated astroglial pS6 expression as well as suppressed GLT-1 expression and astroglial reactivity in the hippocampus after SE. These findings demonstrate that VEGFR-3-mediated mTOR activation could contribute to the regulation of GLT-1 expression in reactive astrocytes during the subacute phase of epilepsy. In conclusion, the present study suggests that VEGFR-3 upregulation in reactive astrocytes may play a role in preventing hyperexcitability induced by continued seizure activity.
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Affiliation(s)
- Kyoung Hoon Jeong
- Department of Neurology, Yonsei University College of Medicine, Seoul, Republic of Korea.,Department of Pharmacology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Kyung-Ok Cho
- Department of Pharmacology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.,Department of Biomedicine & Health Sciences, The Catholic University of Korea, Seoul, Republic of Korea.,Catholic Neuroscience Institute, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Mun-Yong Lee
- Department of Biomedicine & Health Sciences, The Catholic University of Korea, Seoul, Republic of Korea.,Catholic Neuroscience Institute, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.,Department of Anatomy, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Seong Yun Kim
- Department of Pharmacology, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.,Department of Biomedicine & Health Sciences, The Catholic University of Korea, Seoul, Republic of Korea.,Catholic Neuroscience Institute, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Won-Joo Kim
- Department of Neurology, Yonsei University College of Medicine, Seoul, Republic of Korea
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11
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Peterson AR, Binder DK. Regulation of Synaptosomal GLT-1 and GLAST during Epileptogenesis. Neuroscience 2019; 411:185-201. [PMID: 31158434 DOI: 10.1016/j.neuroscience.2019.05.048] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2019] [Revised: 05/22/2019] [Accepted: 05/23/2019] [Indexed: 10/26/2022]
Abstract
Astrocytes regulate extracellular glutamate homeostasis in the central nervous system through the Na+-dependent glutamate transporters glutamate transporter-1 (GLT-1) and glutamate aspartate transporter (GLAST). Impaired astrocyte glutamate uptake could contribute to the development of epilepsy but the regulation of glutamate transporters in epilepsy is not well understood. In this study, we investigate the expression of GLT-1 and GLAST in the mouse intrahippocampal kainic acid (IHKA) model of temporal lobe epilepsy (TLE). We used immunohistochemistry, synaptosomal fractionation and Western blot analysis at 1, 3, 7 and 30 days post-IHKA induced status epilepticus (SE) to examine changes in GLT-1 and GLAST immunoreactivity and synaptosomal expression during the development of epilepsy. We found a significant upregulation in GLT-1 immunoreactivity at 1 and 3 days post-IHKA in the ipsilateral dorsal hippocampus. However, GLT-1 immunoreactivity and synaptosomal protein levels were significantly downregulated at 7 days post-IHKA in the ipsilateral hippocampus, a time point corresponding to the onset of spontaneous seizures in this model. GLAST immunoreactivity was increased in specific layers at 1 and 3 days post-IHKA in the ipsilateral hippocampus. GLAST synaptosomal protein levels were significantly elevated at 30 days compared to 7 days post-IHKA in the ipsilateral hippocampus. Our findings suggest that astrocytic glutamate transporter dysregulation could contribute to the development of epilepsy.
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Affiliation(s)
- Allison R Peterson
- Center for Glial-Neuronal Interactions, Division of Biomedical Sciences, School of Medicine, University of California, Riverside, CA, USA
| | - Devin K Binder
- Center for Glial-Neuronal Interactions, Division of Biomedical Sciences, School of Medicine, University of California, Riverside, CA, USA.
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12
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Hoshi A, Tsunoda A, Yamamoto T, Tada M, Kakita A, Ugawa Y. Altered expression of glutamate transporter-1 and water channel protein aquaporin-4 in human temporal cortex with Alzheimer's disease. Neuropathol Appl Neurobiol 2018; 44:628-638. [PMID: 29405337 DOI: 10.1111/nan.12475] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Accepted: 01/11/2018] [Indexed: 12/13/2022]
Abstract
AIMS Glutamate neurotoxicity plays an important role in the pathogenesis of various neurodegenerative disorders. Many studies have demonstrated that glutamate transporter-1 (GLT-1), the dominant astrocytic glutamate transporter, is significantly reduced in the cerebral cortex of patients with Alzheimer's disease (AD), suggesting that glutamate-mediated excitotoxicity might contribute to the pathogenesis of AD. In a previous study, we have demonstrated marked alterations in the expression of the astrocytic water channel protein aquaporin-4 (AQP4) in relation to amyloid β deposition in human AD brains. As a functional complex, GLT-1 and AQP4 in astrocytes may play a neuroprotective role in the progression of AD pathology. However, few studies have examined the correlation between the expression of GLT-1 and that of AQP4 in human AD brain. METHODS Here, using immunohistochemistry with antibodies against GLT-1 and AQP4, we studied the expression levels and distribution patterns of GLT-1 in areas showing various patterns of AQP4 expression in autopsied temporal lobes from eight patients with AD and five controls without neurological disorders. RESULTS GLT-1 staining in the control group was present throughout the neocortex as uniform neuropil staining with co-localized AQP4. The AD group showed a significant reduction in GLT-1 expression, whereas cortical AQP4 immunoreactivity was more intense in the AD group than in the control group. There were two different patterns of GLT-1 and AQP4 expression in the AD group: (i) uneven GLT-1 expression in the neuropil where diffuse but intense AQP4 expression was evident, and (ii) senile plaque-like co-expression of GLT-1 and AQP4. CONCLUSIONS These findings suggest disruption of glutamate/water homoeostasis in the AD brain.
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Affiliation(s)
- A Hoshi
- Department of Neurology, Fukushima Medical University, Fukushima, Japan.,IMS Shin Katsushika Royal Clinic, Tokyo, Japan
| | - A Tsunoda
- Department of Neurology, Fukushima Medical University, Fukushima, Japan
| | - T Yamamoto
- Department of Neurology, Fukushima Medical University, Fukushima, Japan
| | - M Tada
- Department of Pathology, Brain Research Institute, University of Niigata, Niigata, Japan
| | - A Kakita
- Department of Pathology, Brain Research Institute, University of Niigata, Niigata, Japan
| | - Y Ugawa
- Department of Neurology, Fukushima Medical University, Fukushima, Japan.,Fukushima Global Medical Science Center, Advanced Clinical Research Center, Fukushima Medical University, Fukushima, Japan
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13
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Gasull-Camós J, Soto-Montenegro ML, Casquero-Veiga M, Desco M, Artigas F, Castañé A. Differential Patterns of Subcortical Activity Evoked by Glial GLT-1 Blockade in Prelimbic and Infralimbic Cortex: Relationship to Antidepressant-Like Effects in Rats. Int J Neuropsychopharmacol 2017; 20:988-993. [PMID: 29016806 PMCID: PMC5716080 DOI: 10.1093/ijnp/pyx067] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/26/2017] [Accepted: 07/28/2017] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Glutamatergic neurotransmission has emerged as a novel target in antidepressant drug development, with a critical role of the ventral anterior cingulate cortex. We recently reported that blockade of the astrocytic glutamate transporter GLT-1 with dihydrokainic acid in infralimbic cortex (rodent equivalent of ventral anterior cingulate cortex), but not in the adjacent prelimbic cortex, evoked robust antidepressant-like effects through α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor activation and increased serotonin release. METHODS 2-deoxy-2-[18F]-fluoro-D-glucose-positron emission tomography and computed tomography in 36 male Wistar rats microinfused bilaterally in prelimbic cortex or infralimbic cortex with dihydrokainic acid or vehicle. RESULTS Dihydrokainic acid microinfusion in infralimbic cortex and prelimbic cortex evoked dramatically different regional patterns of subcortical activity. In infralimbic cortex, dihydrokainic acid selectively affected midbrain areas, whereas in prelimbic cortex it affected the basal ganglia, the thalamus, and both superior and inferior colliculi. CONCLUSIONS These results highlight the differential connectivity of infralimbic and prelimbic cortex with subcortical brain regions and support the involvement of infralimbic cortex-midbrain pathway in the antidepressant-like effects of dihydrokainic acid.
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Affiliation(s)
- Júlia Gasull-Camós
- Department of Neurochemistry and Neuropharmacology, CSIC-Institut d’Investigacions Biomèdiques de Barcelona, Barcelona, Spain (Drs Artigas and Castañé and Ms Gasull-Camós); Institut d’Investigacions Biomèdiques August Pi i Sunyer, Barcelona, Spain (Drs Artigas and Castañé and Ms Gasull-Camós); Centro de Investigación Biomédica en Red de Salud Mental, Instituto de Salud Carlos III, Madrid, Spain (Drs Artigas, Castañé, Desco and Soto-Montenegro, Ms Casquero-Veiga and Ms Gasull-Camós); Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain (Drs Desco and Soto-Montenegro and Ms Casquero-Veiga); Departamento de Bioingeniería e Ingeniería Aeroespacial, Universidad Carlos III de Madrid, Spain (Dr Desco); Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain (Dr Desco)
| | - Maria Luisa Soto-Montenegro
- Department of Neurochemistry and Neuropharmacology, CSIC-Institut d’Investigacions Biomèdiques de Barcelona, Barcelona, Spain (Drs Artigas and Castañé and Ms Gasull-Camós); Institut d’Investigacions Biomèdiques August Pi i Sunyer, Barcelona, Spain (Drs Artigas and Castañé and Ms Gasull-Camós); Centro de Investigación Biomédica en Red de Salud Mental, Instituto de Salud Carlos III, Madrid, Spain (Drs Artigas, Castañé, Desco and Soto-Montenegro, Ms Casquero-Veiga and Ms Gasull-Camós); Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain (Drs Desco and Soto-Montenegro and Ms Casquero-Veiga); Departamento de Bioingeniería e Ingeniería Aeroespacial, Universidad Carlos III de Madrid, Spain (Dr Desco); Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain (Dr Desco)
| | - Marta Casquero-Veiga
- Department of Neurochemistry and Neuropharmacology, CSIC-Institut d’Investigacions Biomèdiques de Barcelona, Barcelona, Spain (Drs Artigas and Castañé and Ms Gasull-Camós); Institut d’Investigacions Biomèdiques August Pi i Sunyer, Barcelona, Spain (Drs Artigas and Castañé and Ms Gasull-Camós); Centro de Investigación Biomédica en Red de Salud Mental, Instituto de Salud Carlos III, Madrid, Spain (Drs Artigas, Castañé, Desco and Soto-Montenegro, Ms Casquero-Veiga and Ms Gasull-Camós); Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain (Drs Desco and Soto-Montenegro and Ms Casquero-Veiga); Departamento de Bioingeniería e Ingeniería Aeroespacial, Universidad Carlos III de Madrid, Spain (Dr Desco); Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain (Dr Desco)
| | - Manuel Desco
- Department of Neurochemistry and Neuropharmacology, CSIC-Institut d’Investigacions Biomèdiques de Barcelona, Barcelona, Spain (Drs Artigas and Castañé and Ms Gasull-Camós); Institut d’Investigacions Biomèdiques August Pi i Sunyer, Barcelona, Spain (Drs Artigas and Castañé and Ms Gasull-Camós); Centro de Investigación Biomédica en Red de Salud Mental, Instituto de Salud Carlos III, Madrid, Spain (Drs Artigas, Castañé, Desco and Soto-Montenegro, Ms Casquero-Veiga and Ms Gasull-Camós); Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain (Drs Desco and Soto-Montenegro and Ms Casquero-Veiga); Departamento de Bioingeniería e Ingeniería Aeroespacial, Universidad Carlos III de Madrid, Spain (Dr Desco); Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain (Dr Desco)
| | - Francesc Artigas
- Department of Neurochemistry and Neuropharmacology, CSIC-Institut d’Investigacions Biomèdiques de Barcelona, Barcelona, Spain (Drs Artigas and Castañé and Ms Gasull-Camós); Institut d’Investigacions Biomèdiques August Pi i Sunyer, Barcelona, Spain (Drs Artigas and Castañé and Ms Gasull-Camós); Centro de Investigación Biomédica en Red de Salud Mental, Instituto de Salud Carlos III, Madrid, Spain (Drs Artigas, Castañé, Desco and Soto-Montenegro, Ms Casquero-Veiga and Ms Gasull-Camós); Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain (Drs Desco and Soto-Montenegro and Ms Casquero-Veiga); Departamento de Bioingeniería e Ingeniería Aeroespacial, Universidad Carlos III de Madrid, Spain (Dr Desco); Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain (Dr Desco)
| | - Anna Castañé
- Department of Neurochemistry and Neuropharmacology, CSIC-Institut d’Investigacions Biomèdiques de Barcelona, Barcelona, Spain (Drs Artigas and Castañé and Ms Gasull-Camós); Institut d’Investigacions Biomèdiques August Pi i Sunyer, Barcelona, Spain (Drs Artigas and Castañé and Ms Gasull-Camós); Centro de Investigación Biomédica en Red de Salud Mental, Instituto de Salud Carlos III, Madrid, Spain (Drs Artigas, Castañé, Desco and Soto-Montenegro, Ms Casquero-Veiga and Ms Gasull-Camós); Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain (Drs Desco and Soto-Montenegro and Ms Casquero-Veiga); Departamento de Bioingeniería e Ingeniería Aeroespacial, Universidad Carlos III de Madrid, Spain (Dr Desco); Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain (Dr Desco),Correspondence: Anna Castañé, PhD, Department of Neurochemistry and Neuropharmacology, Rosselló 161 6th Floor, 08036 Barcelona, Spain ()
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14
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Yu P, Guan L, Zhou L, Guo J, Guo R, Lin R, Ding W, Li X, Liu W. Upregulation of glutamate metabolism by BYHWD in cultured astrocytes following oxygen-glucose deprivation/reoxygenation in part depends on the activation of p38 MAPK. Exp Ther Med 2017; 13:3089-3096. [PMID: 28587384 DOI: 10.3892/etm.2017.4330] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Accepted: 01/26/2017] [Indexed: 11/06/2022] Open
Abstract
Recent studies have demonstrated that Buyang Huanwu Decoction (BYHWD) decreased glutamate levels subsequent to cerebral ischemia. Glutamate transporter-1 (GLT-1) and glutamine synthetase (GS), which are located in astrocytes, mainly contribute to glutamate transportation, thus reducing glutamate concentration. BYHWD has previously been demonstrated to upregulate GLT-1 and GS following ischemia in vivo. However, whether BYHWD can directly influence astrocytic GLT-1/GS levels remains unknown. In the present study, the effect of BYHWD containing serum (BYHWD-CS) on GLT-1/GS levels in astrocytes following oxygen-glucose deprivation/reoxygenation (OGD/R) was investigated. The results revealed that BYHWD-CS enhanced the expression levels of GLT-1 and GS in cultured astrocytes, which reduced glutamate concentration in the culture medium. Meanwhile, increased p38 mitogen-activated protein kinase (p38 MAPK) was phosphorylated (activation form) by BYHWD-CS in cultured astrocytes, and the specific p38 inhibitor SB203580 blocked the increase of GLT-1/GS accompanied by decreased cell viability. Furthermore, SB203580 suppressed the effect of BYHWD-CS on the level of glial fibrillary acidic protein (an astrocytic marker), thus confirming that astrocytes are directly involved in the protective role of BYHWD after OGD/R. These findings suggest that BYHWD upregulates GLT-1 and GS via p38 MAPK activation, and protects cultured astrocytes from death caused by OGD/R (typical in vitro model), which complemented the role of astrocytes in the protective effect of BYHWD.
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Affiliation(s)
- Peng Yu
- Department of Physiology, College of Fundamental Medical Science, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, P.R. China
| | - Li Guan
- Department of Physiology, College of Fundamental Medical Science, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, P.R. China
| | - Lequan Zhou
- Department of Physiology, College of Fundamental Medical Science, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, P.R. China
| | - Jianchao Guo
- Department of Physiology, College of Fundamental Medical Science, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, P.R. China
| | - Ruixian Guo
- Department of Physiology, Zhongshan Medical College, Sun Yat-sen University, Guangzhou, Guangdong 510080, P.R. China
| | - Ruishan Lin
- Department of Physiology, College of Fundamental Medical Science, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, P.R. China
| | - Wenting Ding
- Department of Physiology, College of Fundamental Medical Science, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, P.R. China
| | - Xiaoying Li
- Department of Physiology, College of Fundamental Medical Science, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, P.R. China
| | - Wei Liu
- Department of Physiology, College of Fundamental Medical Science, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, P.R. China
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15
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Rappeneau V, Blaker A, Petro JR, Yamamoto BK, Shimamoto A. Disruption of the Glutamate-Glutamine Cycle Involving Astrocytes in an Animal Model of Depression for Males and Females. Front Behav Neurosci 2016; 10:231. [PMID: 28018190 PMCID: PMC5147055 DOI: 10.3389/fnbeh.2016.00231] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Accepted: 11/22/2016] [Indexed: 12/13/2022] Open
Abstract
Background: Women are twice as likely as men to develop major depression. The brain mechanisms underlying this sex disparity are not clear. Disruption of the glutamate–glutamine cycle has been implicated in psychiatric disturbances. This study identifies sex-based impairments in the glutamate–glutamine cycle involving astrocytes using an animal model of depression. Methods: Male and female adult Long-Evans rats were exposed to chronic social defeat stress (CSDS) for 21 days, using a modified resident-intruder paradigm. Territorial aggression was used for males and maternal aggression was used for females to induce depressive-like deficits for intruders. The depressive-like phenotype was assessed with intake for saccharin solution, weight gain, estrous cycle, and corticosterone (CORT). Behaviors displayed by the intruders during daily encounters with residents were characterized. Rats with daily handling were used as controls for each sex. Ten days after the last encounter, both the intruders and controls were subjected to a no-net-flux in vivo microdialysis to assess glutamate accumulation and extracellular glutamine in the nucleus accumbens (NAc). The contralateral hemispheres were used for determining changes in astrocytic markers, including glial fibrillary acidic protein (GFAP) and glutamate transporter-1 (GLT-1). Results: Both male and female intruders reduced saccharin intake over the course of CSDS, compared to their pre-stress period and to their respective controls. Male intruders exhibited submissive/defensive behaviors to territorial aggression by receiving sideways threats and bites. These males showed reductions in striatal GLT-1 and spontaneous glutamine in the NAc, compared to controls. Female intruders exhibited isolated behaviors to maternal aggression, including immobility, rearing, and selfgrooming. Their non-reproductive days were extended. Also, they showed reductions in prefrontal and accumbal GFAP+ cells and prefrontal GLT-1, compared to controls. When 10 μM of glutamate was infused, these females showed a significant accumulation of glutamate compared to controls. Infusions of glutamate reduced extracellular glutamine for both male and female intruders compared to their respective controls. Conclusion: Twenty-one days of territorial or maternal aggression produced a depressive-like phenotype and impaired astrocytes in both male and female intruders. Disruption of the glutamate–glutamine cycle in the PFC-striatal network may be linked to depressive-like deficits more in females than in males.
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Affiliation(s)
- Virginie Rappeneau
- Department of Neuroscience and Pharmacology, Meharry Medical College School of Medicine Nashville, TN, USA
| | - Amanda Blaker
- Department of Pharmacology and Toxicology, Indiana University School of Medicine Indianapolis, IN, USA
| | - Jeff R Petro
- Department of Neuroscience and Pharmacology, Meharry Medical College School of Medicine Nashville, TN, USA
| | - Bryan K Yamamoto
- Department of Pharmacology and Toxicology, Indiana University School of Medicine Indianapolis, IN, USA
| | - Akiko Shimamoto
- Department of Neuroscience and Pharmacology, Meharry Medical College School of Medicine Nashville, TN, USA
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16
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Shi J, Jiang K, Li Z. Involvement of spinal glutamate transporter-1 in the development of mechanical allodynia and hyperalgesia associated with type 2 diabetes. J Pain Res 2016; 9:1121-1129. [PMID: 27932896 PMCID: PMC5135479 DOI: 10.2147/jpr.s118412] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Little is known about the effects of the development of type 2 diabetes on glutamate homeostasis in the spinal cord. Therefore, we quantified the extracellular levels of glutamate in the spinal cord of Zucker diabetic fatty (ZDF) rats using in vivo microdialysis. In addition, protein levels of glutamate transporter-1 (GLT-1) in the spinal cord of ZDF rats were measured using Western blot. Finally, the effects of repeated intrathecal injections of ceftriaxone, which was previously shown to enhance GLT-1 expression, on the development of mechanical allodynia and hyperalgesia as well as on basal extracellular level of glutamate and the expression of GLT-1 in the spinal cord of ZDF rats were evaluated. It was found that ZDF rats developed mechanical hyperalgesia and allodynia, which were associated with increased basal extracellular levels of glutamate and attenuated levels of GLT-1 expression in the spinal cord, particularly in the dorsal horn. Furthermore, repeated intrathecal administrations of ceftriaxone dose-dependently prevented the development of mechanical hyperalgesia and allodynia in ZDF rats, which were correlated with enhanced GLT-1 expression without altering the basal glutamate levels in the spinal cord of ZDF rats. Overall, the results suggested that impaired glutamate reuptake in the spinal cord may contribute to the development of neuropathic pains in type 2 diabetes.
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Affiliation(s)
- Jinshan Shi
- Department of Anesthesiology, Guizhou Provincial People's Hospital
| | - Ke Jiang
- Department of Anesthesiology, The Affiliated Hospital of Guizhou Medical University, Guiyang
| | - Zhaoduan Li
- Department of Anesthesiology, Tianjin Nankai Hospital, Tianjin, People's Republic of China
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17
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Ren S, Xu Y, Lv D, Zhang L. Rosiglitazone ameliorates astrocyte over-activation and inflammatory cytokine release induced by global cerebral ischemia/reperfusion. Exp Ther Med 2016; 11:1071-1076. [PMID: 26998039 DOI: 10.3892/etm.2016.2975] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Accepted: 12/15/2015] [Indexed: 12/17/2022] Open
Abstract
Global cerebral ischemia (GCI) is a leading cause of mortality worldwide and remains the primary cause of long-term neurological disability. Astrocyte over-activation and extensive neuron loss in the ischemic brain are the characteristic pathological features of cerebral ischemia. Rosiglitazone (RSG) is a peroxisome-proliferating activating receptor-γ agonist known for its anti-inflammatory activity. Previous studies have suggested that RSG is able to exert neuroprotection in numerous acute and chronic brain injury models. However, whether RSG treatment is involved in astrocyte over-activation and inflammatory reaction in the cortex remains unclear. The aim of the present study was to investigate whether RSG treatment improved functional impairment induced following GCI and protected against cortex neuron loss, and to elucidate the potential mechanisms underlying these functions. Rats were randomly divided into three groups: Sham-operated, GCI and RSG treatment groups. The RSG treatment group was treated with 2 mg/kg RSG immediately following GCI. The results demonstrated that RSG treatment significantly reduced infarct volume and neuron survival rates in addition to increasing function recovery. Furthermore, these results correlate with a reduction in astrocyte over-activation and inflammatory cytokines in the rat cortex. However, no significant changes in glutamate transporter-1 expression levels were observed following RSG treatment compared with the GCI rats. The results of this investigation provide in vivo evidence that RSG significantly protected rats against ischemia-reperfusion-induced brain injury. In addition, RSG may exert neuroprotective effects by inhibiting astrocyte over-activation, and thereby reducing the levels of inflammatory cytokines in the GCI-injured brain. All data revealed that RSG may be a potential neuroprotective agent for cerebral ischemia.
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Affiliation(s)
- Shanling Ren
- Department of Neurology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Yan Xu
- Department of Neurology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Dongwei Lv
- Department of Neurology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Lei Zhang
- Department of Neurology, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
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Yu D, Fan Y, Sun X, Yao L, Chai W. Effects of erythropoietin preconditioning on rat cerebral ischemia-reperfusion injury and the GLT-1/GLAST pathway. Exp Ther Med 2015; 11:513-518. [PMID: 26893639 DOI: 10.3892/etm.2015.2919] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2014] [Accepted: 05/12/2015] [Indexed: 01/17/2023] Open
Abstract
The aim of the present study was to investigate whether erythropoietin (EPO) preconditioning affects the expression of glutamate transporter 1 (GLT-1) and glutamate aspartate transporter (GLAST) and protects against rat cerebral ischemia-reperfusion injury. A total of 140 Sprague Dawley rats were randomly assigned to one of the following four groups: Sham, EPO-sham, middle cerebral artery occlusion (MCAO) and EPO-MCAO. Neurological function scores were obtained 24, 36 and 72 h after reperfusion. Seventy-two hours after the induction of cerebral ischemia-reperfusion, the number of apoptotic neural cells and the cerebral infarct volume of each group were measured. The mRNA levels of GLT-1 and GLAST were determined using reverse transcription-quantitative polymerase chain reaction (RT-qPCR) analysis, while the GLT-1 and GLAST protein levels were assessed using western blotting. The cerebral infarct volume was significantly increased in the MCAO group compared with that in the sham group (P<0.01); however, the infarct volume of the EPO-MCAO group was significantly lower than that of the MCAO group (P<0.01). In addition, the number of apoptotic cells found in the MCAO group was higher than that in the sham group (P<0.01), but the number of apoptotic cells in the EPO-MCAO group was significantly lower than that in the MCAO group (P<0.01). The GLT-1 and GLAST mRNA and protein levels were significantly decreased 72 h after the cerebral ischemia-reperfusion (P<0.01) compared with those in the sham group, whereas the same levels were increased significantly in the EPO-MCAO group relative to those in the MCAO group (P<0.01). In conclusion, EPO preconditioning protected against cerebral ischemia-reperfusion injury and upregulated the GLT-1 and GLAST expression.
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Affiliation(s)
- Daihua Yu
- Department of Anesthesiology, Tangdu Hospital of the Fourth Military Medical University, Xi'an, Shanxi 710000, P.R. China
| | - Yuanhua Fan
- Intensive Care Unit, Ganzhou People Hospital, Nanchang University, Ganzhou, Jiangxi 325000, P.R. China
| | - Xude Sun
- Department of Anesthesiology, Tangdu Hospital of the Fourth Military Medical University, Xi'an, Shanxi 710000, P.R. China
| | - Linong Yao
- Department of Anesthesiology, Tangdu Hospital of the Fourth Military Medical University, Xi'an, Shanxi 710000, P.R. China
| | - Wei Chai
- Department of Anesthesiology, Tangdu Hospital of the Fourth Military Medical University, Xi'an, Shanxi 710000, P.R. China
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Ding W, Yu P, Liu W, Zhou L, Guan LI, Lin R. Buyang Huanwu decoction increases the expression of glutamate transporter-1 and glutamate synthetase in association with PACAP-38 following focal ischemia. Biomed Rep 2015; 3:651-656. [PMID: 26405540 DOI: 10.3892/br.2015.478] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Accepted: 05/05/2015] [Indexed: 11/06/2022] Open
Abstract
The neuroprotective role of Buyang Huanwu decoction (BYHWD) in focal ischemia is associated with decreasing glutamate concentration. However, the mechanisms are not fully understood. The present study aimed to explore whether glutamate transporter-1 (GLT-1) and glutamine synthetase (GS) participated in the decreased level of glutamate and whether pituitary adenylate cyclase-activating polypeptide-38 (PACAP-38) was involved in this process. BYHWD was found to significantly upregulate the expression of GLT-1 and GS in the hippocampal CA1 area compared to the ischemia group, with the difference on day 3 being most significant. BYHWD increased the level of PACAP-38, and PACAP-(6-38) (PACAP receptor antagonist) significantly attenuated the effect of BYHWD on GLT-1 and GS, suggesting that PACAP-38 was involved in the upregulation of GLT-1 and GS induced by BYHWD. In addition, as GLT-1 and GS are mainly located in astrocytes, the changes of astrocytes were detected by glial fibrillary acidic protein (GFAP; an astrocytic marker) immunostaining. The results showed that BYHWD inhibited the expression of GFAP compared with the ischemia group, however, co-administration with PACAP-(6-38), which inhibited the effect of BYHWD on GLT-1 and GS in astrocytes, attenuated this effect, indicating that astrocytes participated in the protective role of BYHWD following focal ischemia. These results provided the evidence for the first time that not only neurons but also astrocytes contribute to the protective role of BYHWD, which opposes previous studies and may be a starting point for traditional medicine.
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Affiliation(s)
- Wenting Ding
- Department of Physiology, College of Fundamental Medical Science, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, P.R. China
| | - Peng Yu
- Department of Physiology, College of Fundamental Medical Science, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, P.R. China
| | - Wei Liu
- Department of Physiology, College of Fundamental Medical Science, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, P.R. China
| | - Lequan Zhou
- Department of Physiology, College of Fundamental Medical Science, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, P.R. China
| | - L I Guan
- Department of Physiology, College of Fundamental Medical Science, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, P.R. China
| | - Ruishan Lin
- Department of Physiology, College of Fundamental Medical Science, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, P.R. China
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Abstract
The neuroactive steroids 17β-estradiol and progesterone control a broad spectrum of neural functions. Besides their roles in the regulation of classical neuroendocrine loops, they strongly influence motor and cognitive systems, behavior, and modulate brain performance at almost every level. Such a statement is underpinned by the widespread and lifelong expression pattern of all types of classical and non-classical estrogen and progesterone receptors in the CNS. The life-sustaining power of neurosteroids for tattered or seriously damaged neurons aroused interest in the scientific community in the past years to study their ability for therapeutic use under neuropathological challenges. Documented by excellent studies either performed in vitro or in adequate animal models mimicking acute toxic or chronic neurodegenerative brain disorders, both hormones revealed a high potency to protect neurons from damage and saved neural systems from collapse. Unfortunately, neurons, astroglia, microglia, and oligodendrocytes are comparably target cells for both steroid hormones. This hampers the precise assignment and understanding of neuroprotective cellular mechanisms activated by both steroids. In this article, we strive for a better comprehension of the mutual reaction between these steroid hormones and the two major glial cell types involved in the maintenance of brain homeostasis, astroglia and microglia, during acute traumatic brain injuries such as stroke and hypoxia. In particular, we attempt to summarize steroid-activated cellular signaling pathways and molecular responses in these cells and their contribution to dampening neuroinflammation and neural destruction. This article is part of a Special Issue entitled 'CSR 2013'.
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Affiliation(s)
- Sonja Johann
- Institute of Neuroanatomy, RWTH Aachen University, D-52074 Aachen, Germany
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Yang J, Li MX, Luo Y, Chen T, Liu J, Fang P, Jiang B, Hu ZL, Jin Y, Chen JG, Wang F. Chronic ceftriaxone treatment rescues hippocampal memory deficit in AQP4 knockout mice via activation of GLT-1. Neuropharmacology 2013; 75:213-22. [PMID: 23973312 DOI: 10.1016/j.neuropharm.2013.08.009] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Revised: 07/03/2013] [Accepted: 08/08/2013] [Indexed: 10/26/2022]
Abstract
Aquaporin-4 (AQP4) is the predominant water channel protein in the mammalian brain, and is mainly expressed in astrocytes. Besides its important role in water transport across the blood-brain barrier, our present study demonstrated that AQP4 deficiency impaired hippocampal long-term potentiation (LTP) and hippocampus-dependent memory formation, accompanied by the increase in extracellular glutamate concentration and N-methyl-d-aspartate (NMDA) receptor-mediated currents in hippocampal dentate gyrus (DG) region. The impairment of LTP and memory formation of AQP4 knockout (KO) mice was mediated by the downregulation of glutamate transporter-1 (GLT-1) expression/function, since it can be rescued by β-lactam antibiotic ceftriaxone (Cef), a potent GLT-1 stimulator. These results suggest that AQP4 functions as the modulator of synaptic plasticity and memory, and chronic Cef treatment rescues hippocampal memory deficit induced by AQP4 knockout.
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Affiliation(s)
- Jun Yang
- Department of Pharmacology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
| | - Ming-Xing Li
- Department of Pharmacology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
| | - Yi Luo
- Department of Pharmacology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
| | - Tao Chen
- Department of Pharmacology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
| | - Jing Liu
- Department of Pharmacology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
| | - Peng Fang
- Department of Pharmacology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
| | - Bo Jiang
- Department of Pharmacology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
| | - Zhuang-Li Hu
- Department of Pharmacology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China; Key Laboratory of Neurological Diseases (HUST), Ministry of Education of China, Wuhan 430030, China; The Key Laboratory for Drug Target Researches and Pharmacodynamic Evaluation of Hubei Province, Wuhan 430030, China.
| | - You Jin
- Department of Pharmacology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China; Key Laboratory of Neurological Diseases (HUST), Ministry of Education of China, Wuhan 430030, China; The Key Laboratory for Drug Target Researches and Pharmacodynamic Evaluation of Hubei Province, Wuhan 430030, China.
| | - Jian-Guo Chen
- Department of Pharmacology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China; Key Laboratory of Neurological Diseases (HUST), Ministry of Education of China, Wuhan 430030, China; The Key Laboratory for Drug Target Researches and Pharmacodynamic Evaluation of Hubei Province, Wuhan 430030, China.
| | - Fang Wang
- Department of Pharmacology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China; Key Laboratory of Neurological Diseases (HUST), Ministry of Education of China, Wuhan 430030, China; The Key Laboratory for Drug Target Researches and Pharmacodynamic Evaluation of Hubei Province, Wuhan 430030, China.
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Li YK, Wang F, Wang W, Luo Y, Wu PF, Xiao JL, Hu ZL, Jin Y, Hu G, Chen JG. Aquaporin-4 deficiency impairs synaptic plasticity and associative fear memory in the lateral amygdala: involvement of downregulation of glutamate transporter-1 expression. Neuropsychopharmacology 2012; 37:1867-78. [PMID: 22473056 DOI: 10.1038/npp.2012.34] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Astrocytes are implicated in information processing, signal transmission, and regulation of synaptic plasticity. Aquaporin-4 (AQP4) is the major water channel in adult brain and is primarily expressed in astrocytes. A growing body of evidence indicates that AQP4 is a potential molecular target for the regulation of astrocytic function. However, little is known about the role of AQP4 in synaptic plasticity in the amygdala. Therefore, we evaluated long-term potentiation (LTP) in the lateral amygdala (LA) and associative fear memory of AQP4 knockout (KO) and wild-type mice. We found that AQP4 deficiency impaired LTP in the thalamo-LA pathway and associative fear memory. Furthermore, AQP4 deficiency significantly downregulated glutamate transporter-1 (GLT-1) expression and selectively increased NMDA receptor (NMDAR)-mediated EPSCs in the LA. However, low concentration of NMDAR antagonist reversed the impairment of LTP in KO mice. Upregulating GLT-1 expression by chronic treatment with ceftriaxone also reversed the impairment of LTP and fear memory in KO mice. These findings imply a role for AQP4 in synaptic plasticity and associative fear memory in the amygdala by regulating GLT-1 expression.
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Guo Q, Lan J, Zhang W, Guo P, Guo L, Li Z, Qiu Y. Dynamic expression of cerebral cortex and hippocampal glutamate transporters in a rat model of chest compression-induced global cerebral ischemia. Neural Regen Res 2012; 7:125-30. [PMID: 25767487 PMCID: PMC4354127 DOI: 10.3969/j.issn.1673-5374.2012.02.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2011] [Accepted: 12/19/2011] [Indexed: 11/04/2022] Open
Abstract
The present study established a rat model of global cerebral ischemia induced by chest compression for six minutes to dynamically observe expressional changes of three glutamate transporters in the cerebral cortex and hippocampus. After 24 hours of ischemia, expression of glutamate transporter-1 significantly decreased in the cerebral cortex and hippocampus, which was accompanied by neuronal necrosis. At 7 days post-ischemia, expression of excitatory amino acid carrier 1 decreased in the hippocampal CA1 region and cortex, and was accompanied by apoptosis. Expression of glutamate-aspartate transporter remained unchanged at 6 hours-7 days after ischemia. These results suggested that glutamate transporter levels were altered at different periods of cerebral ischemia.
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Affiliation(s)
- Qinhua Guo
- Department of Neurosurgery, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China
| | - Jin Lan
- Department of Neurosurgery, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China
| | - Weiqiao Zhang
- Department of Neurosurgery, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China
| | - Pin Guo
- Department of Neurosurgery, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China
| | - Liemei Guo
- Department of Neurosurgery, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China
| | - Zhiqiang Li
- Central Hospital of Fengxian District, Shanghai Neurological Research Institute of Anhui University of Science & Technology, Shanghai 201400, China,
Corresponding authors: Yongming Qiu, Doctor, Professor, Department of Neurosurgery, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China; Zhiqiang Li, Doctor, Central Hospital of Fengxian District, Shanghai Neurological Research Institute of Anhui University of Science & Technology, Shanghai 201400, China ; (N20110908001/WLM)
| | - Yongming Qiu
- Department of Neurosurgery, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China,
Corresponding authors: Yongming Qiu, Doctor, Professor, Department of Neurosurgery, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China; Zhiqiang Li, Doctor, Central Hospital of Fengxian District, Shanghai Neurological Research Institute of Anhui University of Science & Technology, Shanghai 201400, China ; (N20110908001/WLM)
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