1
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Naderi S, Motamedi F, Pourbadie HG, Rafiei S, Khodagholi F, Naderi N, Janahmadi M. Neuroprotective Effects of Ferrostatin and Necrostatin Against Entorhinal Amyloidopathy-Induced Electrophysiological Alterations Mediated by voltage-gated Ca 2+ Channels in the Dentate Gyrus Granular Cells. Neurochem Res 2024; 49:99-116. [PMID: 37615884 DOI: 10.1007/s11064-023-04006-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2023] [Revised: 06/07/2023] [Accepted: 07/29/2023] [Indexed: 08/25/2023]
Abstract
Alzheimer's disease (AD) is a progressive neurodegenerative disease that is the main form of dementia. Abnormal deposition of amyloid-beta (Aβ) peptides in neurons and synapses cause neuronal loss and cognitive deficits. We have previously reported that ferroptosis and necroptosis were implicated in Aβ25-35 neurotoxicity, and their specific inhibitors had attenuating effects on cognitive impairment induced by Aβ25-35 neurotoxicity. Here, we aimed to examine the impact of ferroptosis and necroptosis inhibition following the Aβ25-35 neurotoxicity on the neuronal excitability of dentate gyrus (DG) and the possible involvement of voltage-gated Ca2+ channels in their effects. After inducing Aβ25-35 neurotoxicity, electrophysiological alterations in the intrinsic properties and excitability were recorded by the whole-cell patch-clamp under current-clamp condition. Voltage-clamp recordings were also performed to shed light on the involvement of calcium channel currents. Aβ25-35 neurotoxicity induced a considerable reduction in input resistance (Rin), accompanied by a profoundly decreased excitability and a reduction in the amplitude of voltage-gated calcium channel currents in the DG granule cells. However, three days of administration of either ferrostatin-1 (Fer-1), a ferroptosis inhibitor, or Necrostatin-1 (Nec-1), a necroptosis inhibitor, in the entorhinal cortex could almost preserve the normal excitability and the Ca2+ currents. In conclusion, these findings suggest that ferroptosis and necroptosis involvement in EC amyloidopathy could be a potential candidate to prevent the suppressive effect of Aβ on the Ca2+ channel current and neuronal function, which might take place in neurons during the development of AD.
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Affiliation(s)
- Soudabeh Naderi
- School of Medicine, Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Fereshteh Motamedi
- Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | | | - Shahrbanoo Rafiei
- Neurobiology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Fariba Khodagholi
- Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Nima Naderi
- Department of Pharmacology and Toxicology, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mahyar Janahmadi
- Neuroscience Research Center, Department of Physiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
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2
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Zhu LJ, Li F, Zhu DY. nNOS and Neurological, Neuropsychiatric Disorders: A 20-Year Story. Neurosci Bull 2023; 39:1439-1453. [PMID: 37074530 PMCID: PMC10113738 DOI: 10.1007/s12264-023-01060-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Accepted: 03/05/2023] [Indexed: 04/20/2023] Open
Abstract
In the central nervous system, nitric oxide (NO), a free gas with multitudinous bioactivities, is mainly produced from the oxidation of L-arginine by neuronal nitric oxide synthase (nNOS). In the past 20 years, the studies in our group and other laboratories have suggested a significant involvement of nNOS in a variety of neurological and neuropsychiatric disorders. In particular, the interactions between the PDZ domain of nNOS and its adaptor proteins, including post-synaptic density 95, the carboxy-terminal PDZ ligand of nNOS, and the serotonin transporter, significantly influence the subcellular localization and functions of nNOS in the brain. The nNOS-mediated protein-protein interactions provide new attractive targets and guide the discovery of therapeutic drugs for neurological and neuropsychiatric disorders. Here, we summarize the work on the roles of nNOS and its association with multiple adaptor proteins on neurological and neuropsychiatric disorders.
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Affiliation(s)
- Li-Juan Zhu
- Key Laboratory of Developmental Genes and Human Diseases, Ministry of Education, Department of Histology and Embryology, School of Medicine, Southeast University, Nanjing, 210009, China
| | - Fei Li
- Department of Medicinal Chemistry, School of Pharmacy, Nanjing Medical University, Nanjing, 211166, China
| | - Dong-Ya Zhu
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, 211166, China.
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3
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Oikonomou KD, Donzis EJ, Bui MTN, Cepeda C, Levine MS. Calcium dysregulation and compensation in cortical pyramidal neurons of the R6/2 mouse model of Huntington's disease. J Neurophysiol 2021; 126:1159-1171. [PMID: 34469694 DOI: 10.1152/jn.00181.2021] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Huntington's disease (HD) is a fatal, hereditary neurodegenerative disorder that predominantly affects striatal medium-sized spiny neurons and cortical pyramidal neurons (CPNs). It has been proposed that perturbations in Ca2+ homeostasis could play a role in CPN alterations. To test this hypothesis, we used the R6/2 mouse model of juvenile HD at different stages of disease progression; presymptomatic, early symptomatic, and late symptomatic. We combined whole-cell patch-clamp recordings of layer 2/3 CPNs with two-photon laser scanning microscopy to image somatic and dendritic Ca2+ transients associated with evoked action potentials (APs). We found that the amplitude of AP-induced Ca2+ transients recorded at the somata of CPNs was significantly reduced in presymptomatic and late symptomatic R6/2 mice compared with wild-type (WT) littermates. However, reduced amplitudes were compensated by increases in decay times, so that Ca2+ transient areas were similar between genotypes. AP-induced Ca2+ transients in CPN proximal dendrites were variable and differences did not reach statistical significance, except for reduced areas in the late symptomatic group. In late symptomatic mice, a specific store-operated Ca2+ channel antagonist, EVP4593, reduced somatic Ca2+ transient amplitude similarly in WT and R6/2 CPNs. In contrast, dantrolene, a ryanodine receptor (RyR) antagonist, and nifedipine, an L-type Ca2+ channel blocker, significantly reduced both somatic Ca2+ transient amplitude and area in R6/2 but not WT CPNs. These findings demonstrate that perturbations of Ca2+ homeostasis and compensation occur in CPNs before and after the onset of overt symptoms, and suggest RyRs and L-type Ca2+ channels as potential targets for therapeutic intervention.NEW & NOTEWORTHY We used two-photon microscopy to examine calcium influx induced by action potentials in cortical pyramidal neurons from a mouse model of Huntington's disease (HD), the R6/2. The amplitude of somatic calcium transients was reduced in R6/2 mice compared with controls. This reduction was compensated by increased decay times, which could lead to reduced calcium buffering capacity. L-type calcium channel and ryanodine receptor blockers reduced calcium transient area in HD neurons, suggesting new therapeutic avenues.
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Affiliation(s)
- Katerina D Oikonomou
- IDDRC, Semel Institute for Neuroscience and Human Behavior, Jane and Terry Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine at University of California Los Angeles, Los Angeles, California
| | - Elissa J Donzis
- IDDRC, Semel Institute for Neuroscience and Human Behavior, Jane and Terry Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine at University of California Los Angeles, Los Angeles, California
| | - Minh T N Bui
- IDDRC, Semel Institute for Neuroscience and Human Behavior, Jane and Terry Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine at University of California Los Angeles, Los Angeles, California
| | - Carlos Cepeda
- IDDRC, Semel Institute for Neuroscience and Human Behavior, Jane and Terry Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine at University of California Los Angeles, Los Angeles, California
| | - Michael S Levine
- IDDRC, Semel Institute for Neuroscience and Human Behavior, Jane and Terry Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine at University of California Los Angeles, Los Angeles, California
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4
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Miranda AS, Cardozo PL, Silva FR, de Souza JM, Olmo IG, Cruz JS, Gomez MV, Ribeiro FM, Vieira LB. Alterations of Calcium Channels in a Mouse Model of Huntington's Disease and Neuroprotection by Blockage of Ca V1 Channels. ASN Neuro 2020; 11:1759091419856811. [PMID: 31216184 PMCID: PMC6585245 DOI: 10.1177/1759091419856811] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Huntington’s disease (HD) is a neurodegenerative autosomal dominant disorder, characterized by symptoms of involuntary movement of the body, loss of cognitive function, psychiatric disorder, leading inevitably to death. It has been previously described that higher levels of brain expression of Cav1 channels are involved in major neurodegenerative disorders, such as Alzheimer’s disease and Parkinson’s disease. Our results demonstrate that a bacterial artificial chromosome (BAC)-mediated transgenic mouse model (BACHD mice) at the age of 3 and 12 months exhibits significantly increased Cav1.2 protein levels in the cortex, as compared with wild-type littermates. Importantly, electrophysiological analyses confirm a significant increase in L-type Ca2+ currents and total Ca2+ current density in cortical neurons from BACHD mice. By using an in vitro assay to measure neuronal cell death, we were able to observe neuronal protection against glutamate toxicity after treatment with Cav1 blockers, in wild-type and, more importantly, in BACHD neurons. According to our data, Cav1 blockers may offer an interesting strategy for the treatment of HD. Altogether, our results show that mutant huntingtin (mHtt) expression may cause a dysregulation of Cav1.2 channels and we hypothesize that this contributes to neurodegeneration during HD.
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Affiliation(s)
- Artur S Miranda
- 1 Department of Biochemistry and Immunology, ICB, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Pablo Leal Cardozo
- 1 Department of Biochemistry and Immunology, ICB, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Flavia R Silva
- 1 Department of Biochemistry and Immunology, ICB, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Jessica M de Souza
- 1 Department of Biochemistry and Immunology, ICB, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Isabella G Olmo
- 1 Department of Biochemistry and Immunology, ICB, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Jader S Cruz
- 1 Department of Biochemistry and Immunology, ICB, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | | | - Fabiola M Ribeiro
- 1 Department of Biochemistry and Immunology, ICB, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Luciene B Vieira
- 3 Department of Pharmacology, ICB, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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5
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Tai YS, Yang SC, Hsieh YC, Huang YB, Wu PC, Tsai MJ, Tsai YH, Lin MW. A Novel Model for Studying Voltage-Gated Ion Channel Gene Expression during Reversible Ischemic Stroke. Int J Med Sci 2019; 16:60-67. [PMID: 30662329 PMCID: PMC6332493 DOI: 10.7150/ijms.27442] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 10/31/2018] [Indexed: 12/21/2022] Open
Abstract
The dysfunction of voltage-gated ion channels contributes to the pathology of ischemic stroke. In this study, we developed rat models of transient ischemic attack (TIA) and reversible ischemic neurological deficit (RIND) that was induced via the injection of artificial embolic particles during full consciousness, that allow us to monitor the neurologic deficit and positron emission tomography (PET) scans in real-time. We then evaluated the infarction volume of brain tissue was confirmed by 2,3,5-triphenyl tetrazolium chloride (TTC) staining, and gene expressions were evaluated by quantitative real-time PCR (qPCR). We found that rats with TIA or RIND exhibited neurological deficits as determined by negative TTC and PET findings. However, the expression of voltage-gated sodium channels in the hippocampus was significantly up-regulated in the qPCR array study. Furthermore, an altered expression of sodium channel β-subunits and potassium channels, were observed in RIND compared to TIA groups. In conclusion, to our knowledge, this is the first report of the successful evaluation of voltage-gated ion channel gene expression in TIA and RIND animal models. This model will aid future studies in investigating pathophysiological mechanisms, and in developing new therapeutic compounds for the treatment of TIA and RIND.
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Affiliation(s)
- Yun-Shen Tai
- Department of Surgery, E-Da Hospital, Kaohsiung, Taiwan
| | - Shih-Chieh Yang
- Department of Orthopedic Surgery, E-Da Hospital, Kaohsiung, Taiwan
| | - Yi-Chun Hsieh
- Department of Anesthesiology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Yaw-Bin Huang
- School of Pharmacy, Kaohsiung Medical University, Kaohsiung, Taiwan.,Center for Stem Cell Research, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Pao-Chu Wu
- School of Pharmacy, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Ming-Jun Tsai
- Department of Neurology, China Medical University Hospital, Taichung, Taiwan.,School of Medicine, China Medical University, Taichung, Taiwan.,Department of Neurology, China Medical University, An-Nan Hospital, Tainan, Taiwan
| | - Yi-Hung Tsai
- School of Pharmacy, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Ming-Wei Lin
- Center for Stem Cell Research, Kaohsiung Medical University, Kaohsiung, Taiwan.,Department of Medical Research, E-Da Hospital/ E-Da Cancer Hospital, Kaohsiung, Taiwan
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6
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Bavarsad K, Barreto GE, Hadjzadeh MAR, Sahebkar A. Protective Effects of Curcumin Against Ischemia-Reperfusion Injury in the Nervous System. Mol Neurobiol 2018; 56:1391-1404. [PMID: 29948942 DOI: 10.1007/s12035-018-1169-7] [Citation(s) in RCA: 72] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Accepted: 05/31/2018] [Indexed: 01/28/2023]
Abstract
Ischemia-reperfusion injury (I/R injury) is a common feature of ischemic stroke which occurs when blood supply is restored after a period of ischemia. Although stroke is an important cause of death in the world, effective therapeutic strategies aiming at improving neurological outcomes in this disease are lacking. Various studies have suggested the involvement of different mechanisms in the pathogenesis of I/R injury in the nervous system. These mechanisms include oxidative stress, platelet adhesion and aggregation, leukocyte infiltration, complement activation, blood-brain barrier (BBB) disruption, and mitochondria-mediated mechanisms. Curcumin, an active ingredient of turmeric, can affect all these pathways and exert neuroprotective activity culminating in the amelioration of I/R injury in the nervous system. In this review, we discuss the protective effects of curcumin against I/R injury in the nervous system and highlight the studies that have linked biological functions of curcumin and I/R injury improvement.
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Affiliation(s)
- Kowsar Bavarsad
- Department of Physiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - George E Barreto
- Departamento de Nutrición y Bioquímica, Facultad de Ciencias, Pontificia Universidad Javeriana, Bogotá D.C., Colombia
- Instituto de Ciencias Biomédicas, Universidad Autónoma de Chile, Santiago, Chile
| | - Mousa-Al-Reza Hadjzadeh
- Department of Physiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Amirhossein Sahebkar
- Neurogenic Inflammation Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
- Biotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran.
- School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran.
- Department of Medical Biotechnology, School of Medicine, Mashhad University of Medical Sciences, P.O. Box: 91779-48564, Mashhad, Iran.
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7
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Dong J, Liu Y, Zhan Z, Wang X. MicroRNA-132 is associated with the cognition improvement following voluntary exercise in SAMP8 mice. Brain Res Bull 2018; 140:80-87. [DOI: 10.1016/j.brainresbull.2018.04.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2017] [Revised: 04/08/2018] [Accepted: 04/12/2018] [Indexed: 12/25/2022]
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8
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Electromagnetic Fields for the Regulation of Neural Stem Cells. Stem Cells Int 2017; 2017:9898439. [PMID: 28932245 PMCID: PMC5592400 DOI: 10.1155/2017/9898439] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2017] [Accepted: 08/02/2017] [Indexed: 01/25/2023] Open
Abstract
Localized magnetic fields (MFs) could easily penetrate the scalp, skull, and meninges, thus inducing an electrical current in both the central and peripheral nervous systems, which is primarily used in transcranial magnetic stimulation (TMS) for inducing specific effects on different regions or cells that play roles in various brain activities. Studies of repetitive transcranial magnetic stimulation (rTMS) have led to novel attractive therapeutic approaches. Neural stem cells (NSCs) in adult human brain are able to self-renew and possess multidifferential ability to maintain homeostasis and repair damage after acute central nervous system. In the present review, we summarized the electrical activity of NSCs and the fundamental mechanism of electromagnetic fields and their effects on regulating NSC proliferation, differentiation, migration, and maturation. Although it was authorized for the rTMS use in resistant depression patients by US FDA, there are still unveiling mechanism and limitations for rTMS in clinical applications of acute central nervous system injury, especially on NSC regulation as a rehabilitation strategy. More in-depth studies should be performed to provide detailed parameters and mechanisms of rTMS in further studies, making it a powerful tool to treat people who are surviving with acute central nervous system injuries.
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9
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Skrzycki M, Czeczot H, Mielczarek-Puta M, Otto-Ślusarczyk D, Graboń W. Effect of different concentrations of oxygen on expression of sigma 1 receptor and superoxide dismutases in human colon adenocarcinoma cell lines. J Recept Signal Transduct Res 2017; 37:252-258. [PMID: 27829319 DOI: 10.1080/10799893.2016.1217882] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2016] [Accepted: 07/17/2016] [Indexed: 12/25/2022]
Abstract
CONTEXT Tumor cells due to distance from capillary vessels exist in different oxygenation conditions (anoxia, hypoxia, normoxia). Changes in cell oxygenation lead to reactive oxygen species production and oxidative stress. Sigma 1 receptor (Sig1R) is postulated to be stress responding agent and superoxide dismutases (SOD1 and SOD2) are key antioxidant enzymes. It is possible that they participate in tumor cells adaptation to different concentrations of oxygen. OBJECTIVE Evaluation of Sig1R, SOD1, and SOD2 expression in different concentrations of oxygen (1%, 10%, 21%) in colon adenocarcinoma cell lines. MATERIALS AND METHODS SW480 (primary adenocarcinoma) and SW620 (metastatic) cell lines were cultured in standard conditions in Dulbecco's modified Eagle's medium for 5 days, and next cultured in Hypoxic Chamber in 1% O2, 10% O2, 21% O2. Number of living cells was determined by trypan blue assay. Level of mRNA for Sig1R, SOD1, and SOD2 was determined by standard PCR method. Statistical analysis was conducted using Statistica 10.1 software. RESULTS We observed significant changes in expression of Sig1R, SOD1, SOD2 due to different oxygen concentrations. ANOVA analysis revealed significant interactions between studied parameters mainly in hypoxia conditions in SW480 cells and between Sig1R and SOD2 in SW620 cells. It also showed that changes in expression of studied proteins depend significantly on type of the cell line. CONCLUSION Changes of Sig1R and SOD2 expression point to mitochondria as main organelle responsible for survival of tumor cells exposed to hypoxia or oxidative stress. Studied proteins are involved in intracellular response to stress related with different concentrations of oxygen.
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Affiliation(s)
- Michał Skrzycki
- a Department of Biochemistry , Medical University of Warsaw , Warsaw , Poland
| | - Hanna Czeczot
- a Department of Biochemistry , Medical University of Warsaw , Warsaw , Poland
| | | | | | - Wojciech Graboń
- a Department of Biochemistry , Medical University of Warsaw , Warsaw , Poland
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10
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Wang DL, Qian XD, Lin YH, Tian BB, Liang HY, Chang L, Wu HY, Zhu DY, Luo CX. ZL006 promotes migration and differentiation of transplanted neural stem cells in male rats after stroke. J Neurosci Res 2017; 95:2409-2419. [PMID: 28512996 DOI: 10.1002/jnr.24068] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2016] [Revised: 03/29/2017] [Accepted: 03/31/2017] [Indexed: 01/17/2023]
Abstract
New strategies must be developed to resolve the problems of stroke treatment. In recent years, stem cell-based therapy after stroke has come into the public and academic lens. Previously we have shown that uncoupling neuronal nitric oxide synthase (nNOS) from the postsynaptic density protein-95 (PSD-95) by ZL006, a small molecular compound, can ameliorate ischemic damage and promote neuronal differentiation of endogenous neural stem cells (NSCs) in focal cerebral ischemic male rats. In this study, we transplanted exogenous NSCs into the ipsilateral hemisphere of male rats in combination with ZL006 treatment after ischemic stroke. We show that ZL006 treatment facilitates the migration of transplanted NSCs into the ischemia-injured area and promotes neuronal differentiation of these cells, which is not due to a direct effect of ZL006 on exogenous NSCs but is associated with increased phosphorylation of cAMP response element-binding protein (CREB) in neurons and favorable microenvironment. Moreover, improved functional outcome in the ZL006-treated group was also found. Taken together, our data indicate that ZL006, uncoupling nNOS-PSD-95 in neurons, positively regulates the fate of transplanted NSCs and benefits the functional outcome after stroke in male rats.
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Affiliation(s)
- Dong-Liang Wang
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, China
| | - Xiao-Dan Qian
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, China
| | - Yu-Hui Lin
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, China
| | - Bin-Bin Tian
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, China
| | - Hai-Ying Liang
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, China
| | - Lei Chang
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, China.,Laboratory of Cerebrovascular Disease, Nanjing Medical University, Nanjing, China
| | - Hai-Yin Wu
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, China.,Laboratory of Cerebrovascular Disease, Nanjing Medical University, Nanjing, China
| | - Dong-Ya Zhu
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, China.,Laboratory of Cerebrovascular Disease, Nanjing Medical University, Nanjing, China.,Institution of Stem Cells and Neuroregeneration, Nanjing Medical University, Nanjing, China
| | - Chun-Xia Luo
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, China.,Laboratory of Cerebrovascular Disease, Nanjing Medical University, Nanjing, China.,Institution of Stem Cells and Neuroregeneration, Nanjing Medical University, Nanjing, China
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11
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Deletion of the Mouse Homolog of CACNA1C Disrupts Discrete Forms of Hippocampal-Dependent Memory and Neurogenesis within the Dentate Gyrus. eNeuro 2016; 3:eN-NWR-0118-16. [PMID: 27957527 PMCID: PMC5124786 DOI: 10.1523/eneuro.0118-16.2016] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Revised: 10/24/2016] [Accepted: 10/26/2016] [Indexed: 12/11/2022] Open
Abstract
L-type voltage-gated calcium channels (LVGCCs) have been implicated in various forms of learning, memory, and synaptic plasticity. Within the hippocampus, the LVGCC subtype, CaV1.2 is prominently expressed throughout the dentate gyrus. Despite the apparent high levels of CaV1.2 expression in the dentate gyrus, the role of CaV1.2 in hippocampal- and dentate gyrus-associated forms of learning remain unknown. To address this question, we examined alternate forms of hippocampal-dependent associative and spatial memory in mice lacking the mouse ortholog of CACNA1C (Cacna1c), which encodes CaV1.2, with dentate gyrus function implicated in difficult forms of each task. We found that while the deletion of CaV1.2 did not impair the acquisition of fear of a conditioned context, mice lacking CaV1.2 exhibited deficits in the ability to discriminate between two contexts, one in which the mice were conditioned and one in which they were not. Similarly, CaV1.2 knock-out mice exhibited normal acquisition and recall of the location of the hidden platform in a standard Morris water maze, but were unable to form a memory of the platform location when the task was made more difficult by restricting the number of available spatial cues. Within the dentate gyrus, pan-neuronal deletion of CaV1.2 resulted in decreased cell proliferation and the numbers of doublecortin-positive adult-born neurons, implicating CaV1.2 in adult neurogenesis. These results suggest that CaV1.2 is important for dentate gyrus-associated tasks and may mediate these forms of learning via a role in adult neurogenesis and cell proliferation within the dentate gyrus.
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12
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Zhu X, Dong J, Shen K, Bai Y, Chao J, Yao H. Neuronal nitric oxide synthase contributes to pentylenetetrazole-kindling-induced hippocampal neurogenesis. Brain Res Bull 2016; 121:138-47. [DOI: 10.1016/j.brainresbull.2016.01.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2015] [Revised: 01/14/2016] [Accepted: 01/21/2016] [Indexed: 02/07/2023]
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13
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Pourbadie HG, Naderi N, Mehranfard N, Janahmadi M, Khodagholi F, Motamedi F. Preventing effect of L-type calcium channel blockade on electrophysiological alterations in dentate gyrus granule cells induced by entorhinal amyloid pathology. PLoS One 2015; 10:e0117555. [PMID: 25689857 PMCID: PMC4331091 DOI: 10.1371/journal.pone.0117555] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Accepted: 12/26/2014] [Indexed: 12/12/2022] Open
Abstract
The entorhinal cortex (EC) is one of the earliest affected brain regions in Alzheimer's disease (AD). EC-amyloid pathology induces synaptic failure in the dentate gyrus (DG) with resultant behavioral impairment, but there is little known about its impact on neuronal properties in the DG. It is believed that calcium dyshomeostasis plays a pivotal role in the etiology of AD. Here, the effect of the EC amyloid pathogenesis on cellular properties of DG granule cells and also possible neuroprotective role of L-type calcium channel blockers (CCBs), nimodipine and isradipine, were investigated. The amyloid beta (Aβ) 1-42 was injected bilaterally into the EC of male rats and one week later, electrophysiological properties of DG granule cells were assessed. Voltage clamp recording revealed appearance of giant sIPSC in combination with a decrease in sEPSC frequency which was partially reversed by CCBs in granule cells from Aβ treated rats. EC amyloid pathogenesis induced a significant reduction of input resistance (Rin) accompanied by a profound decreased excitability in the DG granule cells. However, daily administration of CCBs, isradipine or nimodipine (i.c.v. for 6 days), almost preserved the normal excitability against Aβ. In conclusion, lower tendency to fire AP along with reduced Rin suggest that DG granule cells might undergo an alteration in the membrane ion channel activities which finally lead to the behavioral deficits observed in animal models and patients with early-stage Alzheimer's disease.
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Affiliation(s)
- Hamid Gholami Pourbadie
- Department of Physiology and Pharmacology, Pasteur Institute of Iran, Tehran, Iran
- Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- Department of Physiology, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Nima Naderi
- Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- Department of Pharmacology and Toxicology, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Nasrin Mehranfard
- Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- Department of Physiology, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mahyar Janahmadi
- Neurophysiology Research Center, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Fariba Khodagholi
- Neurobiology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Fereshteh Motamedi
- Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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14
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Lee RJ, Kim JK, Chao D, Kuo L, Mally A, McClean ME, Pemberton HE, Wilmington AR, Wong J, Murphy SP. Progesterone and allopregnanolone improves stroke outcome in male mice via distinct mechanisms but neither promotes neurogenesis. J Neurochem 2014; 132:32-7. [PMID: 25376903 DOI: 10.1111/jnc.12990] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Revised: 11/03/2014] [Accepted: 11/05/2014] [Indexed: 02/01/2023]
Abstract
Based on the outcome of a number of experimental studies, progesterone (PROG) holds promise as a new therapy for stroke. To understand more about the mechanisms involved, we administered PROG (or the major metabolite, allopregnanolone, ALLO), intra-peritoneally, for a period of 24 h after transient middle cerebral artery occlusion to male mice variably expressing intracellular progesterone receptors (iPR) A/B. Effects on infarct volume and neurogenesis were then assessed up to 1 month later. Predictably, infarct volume in wild-type mice receiving either drug was significantly smaller. However, mice heterozygous for iPRs A/B showed protection by ALLO but not by PROG. There was robust amplification of cell division in the wall of the lateral ventricle on the injured side of the brain, these cells migrated into the striatum and lateral cortex, and a significant number survived for at least 3 weeks. However, very few doublecortin-positive cells emerged from the subventricular zone and subsequent expression of NeuN in these newborn neurons was extremely rare. Neither PROG nor ALLO amplified the rate of neurogenesis, suggesting that the long-term benefits of acute drug administration results from tissue preservation. Male mice derive long-lasting benefit from progesterone and allopregnanolone after ischemic stroke. In mice heterozygous for iPRs, only allopregnanolone proved effective, suggesting distinct mechanisms. Abundant newborn cells were found in the wall of the lateral ventricle on the injured side (many doublecortin-positive), some migrated into the striatum and lateral cortex, but very few survived as mature neurons. Neurosteroid administration did not amplify this process.
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Affiliation(s)
- Rona J Lee
- Department of Neurological Surgery, University of Washington School of Medicine, Seattle, Washington, USA
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15
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(S)-ZJM-289 Preconditioning Induces a Late Phase Protection Against Nervous Injury Induced by Transient Cerebral Ischemia and Oxygen-Glucose Deprivation. Neurotox Res 2013; 26:16-31. [DOI: 10.1007/s12640-013-9444-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2013] [Revised: 11/11/2013] [Accepted: 11/15/2013] [Indexed: 12/18/2022]
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16
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Regulation of injury-induced neurogenesis by nitric oxide. Stem Cells Int 2012; 2012:895659. [PMID: 22997523 PMCID: PMC3444935 DOI: 10.1155/2012/895659] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Accepted: 07/19/2012] [Indexed: 12/14/2022] Open
Abstract
The finding that neural stem cells (NSCs) are able to divide, migrate, and differentiate into several cellular types in the adult brain raised a new hope for restorative neurology. Nitric oxide (NO), a pleiotropic signaling molecule in the central nervous system (CNS), has been described to be able to modulate neurogenesis, acting as a pro- or antineurogenic agent. Some authors suggest that NO is a physiological inhibitor of neurogenesis, while others described NO to favor neurogenesis, particularly under inflammatory conditions. Thus, targeting the NO system may be a powerful strategy to control the formation of new neurons. However, the exact mechanisms by which NO regulates neural proliferation and differentiation are not yet completely clarified. In this paper we will discuss the potential interest of the modulation of the NO system for the treatment of neurodegenerative diseases or other pathological conditions that may affect the CNS.
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17
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Swayne LA, Wicki-Stordeur L. Ion channels in postnatal neurogenesis: potential targets for brain repair. Channels (Austin) 2012; 6:69-74. [PMID: 22614818 DOI: 10.4161/chan.19721] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Neural stem and progenitor cells (NSC/NPCs) are unspecialized cells found in the adult peri-ventricular and sub-granular zones that are capable of self-renewal, migration, and differentiation into new neurons through the remarkable process of postnatal neurogenesis. We are now beginning to understand that the concerted action of ion channels, multi-pass transmembrane proteins that allow passage of ions across otherwise impermeable cellular membranes tightly regulate this process. Specific ion channels control proliferation, differentiation and survival. Furthermore, they have the potential to be highly selective drug targets due to their complex structures. As such, these proteins represent intriguing prospects for control and optimization of postnatal neurogenesis for neural regeneration following brain injury or disease. Here, we concentrate on ion channels identified in adult ventricular zone NSC/NPCs that have been found to influence the stages of neurogenesis. Finally, we outline the potential of these channels to elicit repair, and highlight the outstanding challenges.
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Affiliation(s)
- Leigh Anne Swayne
- Division of Medical Sciences; Island Medical Program, University of Victoria, Victoria, BC, Canada.
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18
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Kim S, Rhim H. Effects of amyloid-β peptides on voltage-gated L-type Ca(V)1.2 and Ca(V)1.3 Ca(2+) channels. Mol Cells 2011; 32:289-94. [PMID: 21822937 PMCID: PMC3887631 DOI: 10.1007/s10059-011-0075-x] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2011] [Revised: 05/18/2011] [Accepted: 06/24/2011] [Indexed: 01/01/2023] Open
Abstract
Overload of intracellular Ca(2+) has been implicated in the pathogenesis of neuronal disorders, such as Alzheimer's disease. Various mechanisms produce abnormalities in intracellular Ca(2+) homeostasis systems. L-type Ca(2+) channels have been known to be closely involved in the mechanisms underlying the neurodegenerative properties of amyloid-β (Aβ) peptides. However, most studies of L-type Ca(2+) channels in Aβ-related mechanisms have been limited to Ca(V)1.2, and surprisingly little is known about the involvement of Ca(V)1.3 in Aβ-induced neuronal toxicity. In the present study, we examined the expression patterns of Ca(V)1.3 after Aβ(25-35) exposure for 24 h and compared them with the expression patterns of Ca(V)1.2. The expression levels of Ca(V)1.3 were not significantly changed by Aβ(25-35) at both the mRNA levels and the total protein level in cultured hippocampal neurons. However, surface protein levels of Ca(V)1.3 were significantly increased by Aβ(25-35), but not by Aβ(35-25). We next found that acute treatment with Aβ(25-35) increased Ca(V)1.3 channel activities in HEK293 cells using whole-cell patch-clamp recordings. Furthermore, using GTP pulldown and co-immunoprecipitation assays in HEK293 cell lysates, we found that amyloid precursor protein interacts with β(3) subunits of Ca(2+) channels instead of Ca(V)1.2 or Ca(V)1.3 α(1) subunits. These results show that Aβ(25-35) chronically or acutely upregulates Ca(V)1.3 in the rat hippocampal and human kidney cells (HEK293). This suggests that Ca(V)1.3 has a potential role along with Ca(V)1.2 in the pathogenesis of Alzheimer's disease.
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Affiliation(s)
- Sunoh Kim
- Jeollanamdo Institute of Natural Resources Research, Jangheung 529-851, Korea
| | - Hyewhon Rhim
- Biomedical Research Center, Korea Institute of Science and Technology, Seoul 136-791, Korea
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19
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Mice lacking urea transporter UT-B display depression-like behavior. J Mol Neurosci 2011; 46:362-72. [PMID: 21750947 DOI: 10.1007/s12031-011-9594-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2011] [Accepted: 07/01/2011] [Indexed: 12/25/2022]
Abstract
Urea transporter B is one of urea transporters that selectively transport urea driven by urea gradient across membrane and expressed abundantly in brain. To determine the physiological role of UT-B in brain, UT-B localization, urea concentration, tissue morphology of brain, and behavioral phenotypes were studied in UT-B heterozygous mice via UT-B null mice. UT-B mRNA was expressed in olfactory bulb, cortex, caudate nucleus, hippocampus and hypothalamus of UT-B heterozygous mice. UT-B null mice exhibited depression-like behavior, with urea accumulation, nitric oxide reduction, and selective neuronal nitric oxide synthase level increase in hippocampus. After acute urea loading, the urea level increased, NO production decreased in hippocampus from both types of mice. Moreover, urea level was higher, and NO concentration was lower consistently in UT-B null hippocampus than that in heterozygous hippocampus. In vitro, 25 mM urea inhibited NO production too. Furthermore, UT-B knockout induced a long-lasting notable decrease in regional cerebral blood flow and altered morphology, such as loss of neurons in CA3 region, swelling, and membranous myelin-like structure formation within myelinated and unmyelinated fibers in hippocampus. These results suggest that urea accumulation in the hippocampus induced by UT-B deletion can cause depression-like behavior, which possibly attribute to disturbance in NOS/NO system.
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20
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Zhu Y, Zhou R, Yang R, Zhang Z, Bai Y, Chang F, Li L, Sokabe M, Goltzman D, Miao D, Chen L. Abnormal neurogenesis in the dentate gyrus of adult mice lacking 1,25-dihydroxy vitamin D3 (1,25-(OH)2 D3). Hippocampus 2010; 22:421-33. [PMID: 21125584 DOI: 10.1002/hipo.20908] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/14/2010] [Indexed: 01/21/2023]
Abstract
In this study, we employed 1α-hydroxylase knockout (1α-(OH)ase(-/-) ) mice to investigate the influence of 1,25-dihydroxy vitamin D(3) (1,25-(OH)(2) D(3) ) deficiency on the adult neurogenesis in the hippocampal dentate gyrus (DG). The numbers of both 24-hr-old BrdU(+) cells and proliferating cell nuclear antigen positive cells in 8-week-old 1α-(OH)ase(-/-) mice increased approximately twofold compared with wild-type littermates. In contrast, the numbers of 7- and 28-day-old BrdU(+) cells in 1α-(OH)ase(-/-) mice decreased by 50% compared with wild-type mice, while the proportion of BrdU(+) /NeuN(+) cells in BrdU(+) population showed no difference between 1α-(OH)ase(-/-) and wild-type mice. Apoptotic cells in the subgranular zone (SGZ) of DG markedly increased in 1α-(OH)ase(-/-) mice. Replenishment of 1,25-(OH)(2) D(3) , but not correction of serum calcium and phosphorus levels, completely prevented changes in the neurogenesis in 1α-(OH)ase(-/-) mice. The absence of 1,25-(OH)(2) D(3) led to an increase in the expression of L-type voltage-gated calcium channel (L-VGCC) and a decrease in the nerve growth factor (NGF) mRNA level. Treatment with the L-VGCC inhibitor nifedipine blocked the increased cell proliferations by 1,25-(OH)(2) D(3) deficiency. Administration of NGF significantly attenuated the loss of newborn neurons in 1α-(OH)ase(-/-) mice.
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Affiliation(s)
- Ying Zhu
- Department of Physiology, Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, People's Republic of China
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21
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Luo CX, Jin X, Cao CC, Zhu MM, Wang B, Chang L, Zhou QG, Wu HY, Zhu DY. BIdirectional Regulation of Neurogenesis by Neuronal Nitric Oxide Synthase Derived from Neurons and Neural Stem Cells. Stem Cells 2010; 28:2041-52. [DOI: 10.1002/stem.522] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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22
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Yasuda T, Adams DJ. Physiological roles of ion channels in adult neural stem cells and their progeny. J Neurochem 2010; 114:946-59. [PMID: 20492359 DOI: 10.1111/j.1471-4159.2010.06822.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Elucidation of the machinery of adult neurogenesis is indispensable for the treatment of neurodegenerative diseases by therapeutic drugs and/or by neural stem cell (NSC) transplantation. It is well known that membrane ion channels play a critical role in cell function, including proliferation, apoptosis and migration in a wide range of cells. In NSC research, interdisciplinary collaboration between cell biologists and membrane physiologists has been pursued principally to monitor ion channel and synaptic currents as a hallmark of neuronal differentiation and maturation of NSC progeny. Nevertheless, less attention had been paid to a functional role of ion channels in NSCs or their immature progeny. Recently, however, evidence regarding their functional relevance has started to accumulate. In focusing on the early stages of the neurogenic process during which NSCs give rise to neuroblasts, this review highlights the latent ability of ion channels to act as functional regulators of adult neurogenesis.
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Affiliation(s)
- Takahiro Yasuda
- Health Innovations Research Institute, RMIT University, Melbourne, Victoria, Australia.
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23
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Lai B, Mao XO, Xie L, Chang SY, Xiong ZG, Jin K, Greenberg DA. Electrophysiological properties of subventricular zone cells in adult mouse brain. Brain Res 2010; 1340:96-105. [PMID: 20434436 DOI: 10.1016/j.brainres.2010.04.057] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2010] [Revised: 04/20/2010] [Accepted: 04/22/2010] [Indexed: 01/15/2023]
Abstract
The subventricular zone (SVZ) is a principal site of adult neurogenesis and appears to participate in the brain's response to injury. Thus, measures that enhance SVZ neurogenesis may have a role in treatment of neurological disease. To better characterize SVZ cells and identify potential targets for therapeutic intervention, we studied electrophysiological properties of SVZ cells in adult mouse brain slices using patch-clamp techniques. Electrophysiology was correlated with immunohistochemical phenotype by injecting cells with lucifer yellow and by studying transgenic mice carrying green fluorescent protein under control of the doublecortin (DCX) or glial fibrillary acidic protein (GFAP) promoter. We identified five types of cells in the adult mouse SVZ: type 1 cells, with 4-aminopyridine (4-AP)/tetraethylammonium (TEA)-sensitive and CdCl(2)-sensitive inward currents; type 2 cells, with Ca(2+)-sensitive K(+) and both 4-AP/TEA-sensitive and -insensitive currents; type 3 cells, with 4-AP/TEA-sensitive and -insensitive K(+) and small Na(+) currents; type 4 cells, with slowly activating, large linear outward current and sustained outward current without fast-inactivating component; and type 5 cells, with a large outward rectifying current with a fast inactivating component. Type 2 and 3 cells expressed DCX, types 4 and 5 cells expressed GFAP, and type 1 cells expressed neither. We propose that SVZ neurogenesis involves a progression of electrophysiological cell phenotypes from types 4 and 5 cells (astrocytes) to type 1 cells (neuronal progenitors) to types 2 and 3 cells (nascent neurons), and that drugs acting on ion channels expressed during neurogenesis might promote therapeutic neurogenesis in the injured brain.
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Affiliation(s)
- Bin Lai
- Buck Institute for Age Research, 8001 Redwood Boulevard, Novato, California 94945, USA
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24
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Kong H, Fan Y, Xie J, Ding J, Sha L, Shi X, Sun X, Hu G. AQP4 knockout impairs proliferation, migration and neuronal differentiation of adult neural stem cells. J Cell Sci 2008; 121:4029-36. [DOI: 10.1242/jcs.035758] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Aquaporin-4 (AQP4), a key molecule for maintaining water and ion homeostasis in the central nervous system, is expressed in adult neural stem cells (ANSCs) as well as astrocytes. However, little is known about the functions of AQP4 in the ANSCs in vitro. Here we show that AQP4 knockout inhibits the proliferation, survival, migration and neuronal differentiation of ANSCs derived from the subventricular zone of adult mice. Flow cytometric cell cycle analysis revealed that AQP4 knockout increased the basal apoptosis and induced a G2-M arrest in ANSCs. Using Fluo-3 Ca2+ imaging, we show that AQP4 knockout alters the spontaneous Ca2+ oscillations by frequency enhancement and amplitude suppression, and suppresses KCl-induced Ca2+ influx. AQP4 knockout downregulated the expression of connexin43 and the L-type voltage-gated Ca2+ channel CaV1.2 subtype in ANSCs. Together, these findings suggest that AQP4 plays a crucial role in regulating the proliferation, migration and differentiation of ANSCs, and this function of AQP4 is probably mediated by its action on intracellular Ca2+ dynamics.
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Affiliation(s)
- Hui Kong
- Jiangsu Key Laboratory of Neurodegeneration, Department of Pharmacology, Nanjing Medical University, 140 Hanzhong Road, Nanjing, Jiangsu 210029, China
| | - Yi Fan
- Jiangsu Key Laboratory of Neurodegeneration, Department of Pharmacology, Nanjing Medical University, 140 Hanzhong Road, Nanjing, Jiangsu 210029, China
| | - Juan Xie
- Jiangsu Key Laboratory of Neurodegeneration, Department of Pharmacology, Nanjing Medical University, 140 Hanzhong Road, Nanjing, Jiangsu 210029, China
| | - Jianhua Ding
- Jiangsu Key Laboratory of Neurodegeneration, Department of Pharmacology, Nanjing Medical University, 140 Hanzhong Road, Nanjing, Jiangsu 210029, China
| | - Luolin Sha
- Jiangsu Key Laboratory of Neurodegeneration, Department of Pharmacology, Nanjing Medical University, 140 Hanzhong Road, Nanjing, Jiangsu 210029, China
| | - Xueru Shi
- Jiangsu Key Laboratory of Neurodegeneration, Department of Pharmacology, Nanjing Medical University, 140 Hanzhong Road, Nanjing, Jiangsu 210029, China
| | - Xiulan Sun
- Jiangsu Key Laboratory of Neurodegeneration, Department of Pharmacology, Nanjing Medical University, 140 Hanzhong Road, Nanjing, Jiangsu 210029, China
| | - Gang Hu
- Jiangsu Key Laboratory of Neurodegeneration, Department of Pharmacology, Nanjing Medical University, 140 Hanzhong Road, Nanjing, Jiangsu 210029, China
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25
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Hua Y, Huang XY, Zhou L, Zhou QG, Hu Y, Luo CX, Li F, Zhu DY. DETA/NONOate, a nitric oxide donor, produces antidepressant effects by promoting hippocampal neurogenesis. Psychopharmacology (Berl) 2008; 200:231-42. [PMID: 18512047 DOI: 10.1007/s00213-008-1200-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/20/2007] [Accepted: 05/06/2008] [Indexed: 01/01/2023]
Abstract
RATIONALE Increasing evidence suggests that depression may be associated with a lack of hippocampal neurogenesis. Our recent study shows that endogenous nitric oxide (NO) contributes to chronic mild stress (CMS)-induced depression by suppressing hippocampal neurogenesis. OBJECTIVES The aim of this study was to investigate the effects of exogenous NO in CMS-induced depression in young adult mice. RESULTS In normal mice, administration of a pure NO donor (Z)-1-[N-(2-aminoethyl)-N-(2-ammonioethyl) aminio] diazen-1-ium-1,2-diolate (DETA/NONOate; 0.4 mg/kg, i.p., for 7 days) produced an antidepressant-like effect and significantly increased hippocampal neurogenesis. The mice exposed to CMS exhibited behavioral changes typical of depression and impaired neurogenesis in the hippocampus. Treatment with DETA/NONOate (0.4 mg/kg, i.p., for 7 days) reversed CMS-induced behavioral despair and hippocampal neurogenesis impairment. We treated mice with a telomerase inhibitor 3'-azido-deoxythymidine (AZT; 100 mg/kg, i.p., for 14 days) to disrupt neurogenesis. From day 4 to day 11 of AZT treatment, mice were injected with DETA/NONOate (0.4 mg/kg, i.p., for 7 days). Disrupting hippocampal neurogenesis blocked the antidepressant effect of DETA/NONOate. CONCLUSIONS Our findings suggest that exogenous NO benefits chronic stress-induced depression by stimulating hippocampal neurogenesis and may represent a novel approach for the treatment of depressive disorders.
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Affiliation(s)
- Yao Hua
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, 210029, China
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26
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Abstract
It is common knowledge that ischemic stroke has major social and economic consequences. However, until now, translation of experimental studies into clinical reality has been sorely lacking. So far, most studies have focused on acute stroke outcome and early treatment paradigms affording neuroprotection. It is increasingly recognized that it will be necessary to harness the capacity of the brain for neuroregeneration to improve longer-term outcome. Endothelial nitric oxide synthase (eNOS) is emerging as a key target in molecular stroke research. eNOS ameliorates acute ischemic injury and promotes recovery following cerebral ischemia. This review summarizes the effects of eNOS on the regulation of cerebral blood flow, hemostasis, inflammation, angiogenesis as well as neurogenesis. The possible impact on stroke prevention as well as on strategies aimed at improving long-term stroke outcome are discussed.
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Affiliation(s)
- Karen Gertz
- Charité Universitätsmedizin Berlin, Klinik und Poliklinik für Neurologie, Abteilung für Experimentelle Neurologie, Charitéplatz 1, 10117 Berlin, Germany
| | - Matthias Endres
- Charité Universitätsmedizin Berlin, Klinik und Hochschulambulanz für Neurologie und Klinische Neurophysiologie, Campus Benjamin Franklin and Center for Stroke Research Berlin, Charitéplatz 1, 10117 Berlin, Germany
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27
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Shioda N, Han F, Morioka M, Fukunaga K. Bis(1-oxy-2-pyridinethiolato)oxovanadium(IV) enhances neurogenesis via phosphatidylinositol 3-kinase/Akt and extracellular signal regulated kinase activation in the hippocampal subgranular zone after mouse focal cerebral ischemia. Neuroscience 2008; 155:876-87. [PMID: 18616990 DOI: 10.1016/j.neuroscience.2008.05.056] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2007] [Revised: 05/08/2008] [Accepted: 05/11/2008] [Indexed: 11/19/2022]
Abstract
Although neurogenesis in the hippocampus is critical for improvement of depressive behaviors and cognitive functions in neurodegeneration disorders, there is no therapeutic agent available to promote neurogenesis in adult brain following brain ischemic injury. Here we found that i.p. administration of bis(1-oxy-2-pyridinethiolato)oxovanadium(IV) [VO(OPT)], which stimulates phosphatidylinositol 3-kinase (PI3K)/Akt and extracellular signal regulated kinase (ERK) pathways, markedly enhanced brain ischemia-induced neurogenesis in the subgranular zone (SGZ) of the mouse hippocampus. VO(OPT) treatment enhanced not only the number of proliferating cells but also migration of neuroblasts. VO(OPT)-induced neurogenesis was associated with Akt and ERK activation in neural precursors in the SGZ. Likewise, VO(OPT)-induced neurogenesis was blocked by both PI3K/Akt and mitogen-activated protein kinase/extracellular signal regulated kinase kinase (MEK)/ERK inhibitors. VO(OPT) treatment rescued decreased phosphorylation of glycogen synthesis kinase 3beta (GSK-3beta) at Ser-9. Finally, amelioration of cognitive dysfunction seen following brain ischemia was positively correlated with VO(OPT)-induced neurogenesis. Taken together, VO(OPT) is a potential therapeutic agent that enhances ischemia-induced neurogenesis through PI3K/Akt and ERK activation, thereby improving memory and cognitive deficits following brain ischemia.
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Affiliation(s)
- N Shioda
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Tohoku University, Aramaki-Aoba Aoba-ku, Sendai 980-8578, Japan
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28
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Luo CX, Jiang J, Zhou QG, Zhu XJ, Wang W, Zhang ZJ, Han X, Zhu DY. Voluntary exercise-induced neurogenesis in the postischemic dentate gyrus is associated with spatial memory recovery from stroke. J Neurosci Res 2007; 85:1637-46. [PMID: 17465031 DOI: 10.1002/jnr.21317] [Citation(s) in RCA: 122] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Spatial cognitive impairment is common after stroke insults. Voluntary exercise could improve the impaired spatial memory. Newly generated neurons in the dentate gyrus are necessary for the acquisition of new hippocampus-dependent memories. However, it is not well known whether voluntary exercise after stroke promotes neurogenesis in the adult dentate gyrus, thereby promoting spatial memory recovery. Here, we examined in mice subjected to focal cerebral ischemia the effect of voluntary or forced exercise on neurogenesis in the ischemic dentate gyrus and spatial memory. Exposure to voluntary wheel running after stroke enhanced newborn cell survival and up-regulated the phosphorylation of cAMP response element binding protein (CREB) in the dentate gyrus and reversed ischemia-induced spatial memory impairment. However, the enhanced newborn cell survival and CREB phosphorylation in the dentate gyrus and improved spatial memory were not observed in the mice exposed to forced swimming. Moreover, there was a significant correlation between the total number of surviving newborn cells in the dentate gyrus and the ability of mice to locate the platform in the Morris water maze. These results suggest that, in the adult mice, exposure to voluntary exercise after ischemic stroke may promote newborn cells survival in the dentate gyrus by up-regulating CREB phosphorylation and consequently restore impaired hippocampus-dependent memory.
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Affiliation(s)
- Chun Xia Luo
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, China
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29
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Kim S, Nah SY, Rhim H. Neuroprotective effects of ginseng saponins against L-type Ca2+ channel-mediated cell death in rat cortical neurons. Biochem Biophys Res Commun 2007; 365:399-405. [PMID: 18023426 DOI: 10.1016/j.bbrc.2007.10.048] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2007] [Accepted: 10/02/2007] [Indexed: 11/17/2022]
Abstract
In the present study, we have examined any possible involvement of L-type Ca(2+) channels in ginseng-mediated neuroprotective actions. Exposure to a 50mM KCl (high-K) produced neuronal cell death, which was blocked by a selective L-type Ca(2+) channel blocker in cultured cortical neurons. When cultured cells were co-treated with ginseng total saponin (GTS) and high-K, GTS reduced high-K-induced neuronal death. Using Ca(2+) imaging techniques, we found that GTS inhibited high-K-mediated acute and long-term [Ca(2+)](i) changes. These GTS-mediated [Ca(2+)](i) changes were diminished by nifedipine. Furthermore, GTS-mediated effects were also diminished by a saturating concentration of Bay K (10muM). After confirming the protective effect of GTS using a TUNEL assay, we found that ginsenosides Rf and Rg(3) are active components in ginseng-mediated neuroprotection. These results suggest that inhibition of L-type Ca(2+) channels by ginseng could be one of the mechanisms for ginseng-mediated neuroprotection in cultured rat cortical neurons.
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Affiliation(s)
- Sunoh Kim
- Life Sciences Division, Korea Institute of Science and Technology, 39-1 Hawholgok-dong Sungbuk-gu, Seoul 136-791, Republic of Korea
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30
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Zhou QG, Hu Y, Hua Y, Hu M, Luo CX, Han X, Zhu XJ, Wang B, Xu JS, Zhu DY. Neuronal nitric oxide synthase contributes to chronic stress-induced depression by suppressing hippocampal neurogenesis. J Neurochem 2007; 103:1843-54. [PMID: 17854383 DOI: 10.1111/j.1471-4159.2007.04914.x] [Citation(s) in RCA: 168] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Increasing evidence suggests that depression may be associated with a lack of hippocampal neurogenesis. It is well established that neuronal nitric oxide synthase (nNOS)-derived NO exerts a negative control on the hippocampal neurogenesis. Using genetic and pharmacological methods, we investigated the roles of nNOS in depression induced by chronic mild stress (CMS) in mice. Hippocampal nNOS over-expression was first observed 4 days and remained elevated 21 and 56 days after exposure to CMS. The mice exposed to CMS exhibited behavioral changes typical of depression, and impaired neurogenesis in the hippocampus. The CMS-induced behavioral despair and hippocampal neurogenesis impairment were prevented and reversed in the null mutant mice lacking nNOS gene (nNOS-/-) and in the mice receiving nNOS inhibitor. Disrupting hippocampal neurogenesis blocked the antidepressant effect of nNOS inhibition. Moreover, nNOS-/- mice exhibited antidepressant-like properties. Our findings suggest that nNOS over-expression in the hippocampus is essential for chronic stress-induced depression and inhibiting nNOS signaling in brain may represent a novel approach for the treatment of depressive disorders.
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Affiliation(s)
- Qi-Gang Zhou
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, China
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Luo CX, Zhu XJ, Zhou QG, Wang B, Wang W, Cai HH, Sun YJ, Hu M, Jiang J, Hua Y, Han X, Zhu DY. Reduced neuronal nitric oxide synthase is involved in ischemia-induced hippocampal neurogenesis by up-regulating inducible nitric oxide synthase expression. J Neurochem 2007; 103:1872-82. [PMID: 17854382 DOI: 10.1111/j.1471-4159.2007.04915.x] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Nitric oxide (NO), a free radical with signaling functions in the CNS, is implicated in some developmental processes, including neuronal survival, precursor proliferation, and differentiation. However, neuronal nitric oxide synthase (nNOS) -derived NO and inducible nitric oxide synthase (iNOS) -derived NO play opposite role in regulating neurogenesis in the dentate gyrus after cerebral ischemia. In this study, we show that focal cerebral ischemia reduced nNOS expression and enzymatic activity in the hippocampus. Ischemia-induced cell proliferation in the dentate gyrus was augmented in the null mutant mice lacking nNOS gene (nNOS-/-) and in the rats receiving 7-nitroindazole, a selective nNOS inhibitor, after stroke. Inhibition of nNOS ameliorated ischemic injury, up-regulated iNOS expression, and enzymatic activity in the ischemic hippocampus. Inhibition of nNOS increased and iNOS inhibitor decreased cAMP response element-binding protein phosphorylation in the ipsilateral hippocampus in the late stage of stroke. Moreover, the effects of 7-nitroindazole on neurogenesis after ischemia disappeared in the null mutant mice lacking iNOS gene (iNOS-/-). These results suggest that reduced nNOS is involved in ischemia-induced hippocampal neurogenesis by up-regulating iNOS expression and cAMP response element-binding protein phosphorylation.
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Affiliation(s)
- Chun Xia Luo
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, China
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Okun E, Arumugam TV, Tang SC, Gleichmann M, Albeck M, Sredni B, Mattson MP. The organotellurium compound ammonium trichloro(dioxoethylene-0,0') tellurate enhances neuronal survival and improves functional outcome in an ischemic stroke model in mice. J Neurochem 2007; 102:1232-41. [PMID: 17542809 DOI: 10.1111/j.1471-4159.2007.04615.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ammonium trichloro(dioxoethylene-0,0') tellurate (AS101) is a non-toxic organotellurium compound with pleiotropic activities. It was recently shown to induce production of the neurotrophic factor glial cell line-derived neurotrophic factor and to rescue neuronal-like PC-12 cells from neurotrophic factor deprivation-induced apoptosis. In this study, we show that AS101 improves functional outcome and reduces brain damage in a mouse model of focal ischemic stroke. Both pre-stroke and post-stroke intraperitoneal treatments with AS101 reduced infarct size and edema and improved the neurological function of the animals. AS101 treatments reduced both apoptotic and inflammatory caspase activities, and also inhibited protein tyrosine nitration suggesting that AS101 suppresses oxidative stress. Studies of cultured neurons showed that AS101 confers protection against apoptosis induced by either glucose deprivation or the lipid peroxidation product 4-hydroxynonenal. Moreover, AS101 treatment reduced glutamate-induced intracellular calcium elevation, a major contributor to neuronal death in stroke. As AS101 has an excellent safety profile in humans, our pre-clinical data suggest a potential therapeutic benefit of AS101 in patients suffering from stroke and other neurodegenerative conditions.
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Affiliation(s)
- Eitan Okun
- CAIR Institute, Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan, Israel
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Jiang J, Wang W, Sun YJ, Hu M, Li F, Zhu DY. Neuroprotective effect of curcumin on focal cerebral ischemic rats by preventing blood–brain barrier damage. Eur J Pharmacol 2007; 561:54-62. [PMID: 17303117 DOI: 10.1016/j.ejphar.2006.12.028] [Citation(s) in RCA: 158] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2006] [Revised: 12/13/2006] [Accepted: 12/21/2006] [Indexed: 12/26/2022]
Abstract
Curcumin, a member of the curcuminoid family of compounds, is a yellow colored phenolic pigment obtained from powdered rhizome of C. longa Linn. Recent studies have demonstrated that curcumin has protective effects against cerebral ischemia/reperfusion injury. However, little is known about its mechanism. Disruption of the blood-brain barrier occurs after stroke. Protection of the blood-brain barrier has become an important target of stroke interventions in experimental therapeutic. The objective of the present study was to determine whether curcumin prevents cerebral ischemia/reperfusion injury by protecting blood-brain barrier integrity. We report that a single injection of curcumin (1 and 2 mg/kg, i.v.) 30 min after focal cerebral ischemia/reperfusion in rats significantly diminished infarct volume, improved neurological deficit, decreased mortality, reduced the water content of the brain and the extravasation of Evans blue dye in ipsilateral hemisphere in a dose-dependent manner. In cultured astrocytes, curcumin significantly inhibited inducible nitric oxide synthase (iNOS) expression and NO(x) (Nitrites/nitrates contents) production induced by lipopolysaccharide (LPS)/tumor necrosis factor alpha (TNF(alpha)). Furthermore, curcumin prevented ONOO(-) donor SIN-1-induced cerebral capillaries endothelial cells damage. We concluded that curcumin ameliorates cerebral ischemia/reperfusion injury by preventing ONOO(-) mediated blood-brain barrier damage.
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Affiliation(s)
- Jun Jiang
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, Nanjing, 210029, China
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Nygren J, Wieloch T, Pesic J, Brundin P, Deierborg T. Enriched environment attenuates cell genesis in subventricular zone after focal ischemia in mice and decreases migration of newborn cells to the striatum. Stroke 2006; 37:2824-9. [PMID: 17008628 DOI: 10.1161/01.str.0000244769.39952.90] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND AND PURPOSE Cells proliferate continuously in the adult mammalian brain, and in rodents, cell genesis is affected by housing conditions and brain injury. Increase in neurogenesis after brain ischemia has been postulated to be linked to functional recovery after stroke. Housing rodents in an enriched environment improves motor function after stroke injury. We have investigated whether changes in cell genesis can explain the beneficial effects of an enriched environment. METHODS Intact mice and mice subjected to transient occlusion of the middle cerebral artery were exposed to an enriched environment for 1 month. Bromodeoxyuridine was injected daily to label proliferating cells during the first postischemic week. Newborn cells were analyzed immunohistochemically after 4 weeks. RESULTS The enriched environment increased neurogenesis in the dentate gyrus in both intact and stroke-injured animals. An increased number of newborn cells was found in the subventricular zone of stroke-injured mice, but not in injured mice exposed to an enriched environment. Also, the number of newborn astrocytes (BrdU+/S-100beta+ cells), neuroblasts (dcx+ cells), and reactive astrocytes (vimentin mRNA) in the striatum ipsilateral to the ischemic injury was markedly attenuated and new adult neurons (BrdU+/NeuN+) were not found. The enriched environment did not affect infarct size or mortality. CONCLUSIONS An enriched environment after experimental stroke increased neurogenesis in the hippocampus, whereas there was a decreased cell genesis and migration of neuroblasts and newborn astrocytes in the striatum.
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Affiliation(s)
- Josefine Nygren
- Experimental Brain Research, Wallenberg Neuroscience Center, Lund University, Lund, Sweden
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Turner CP, Miller R, Smith C, Brown L, Blackstone K, Dunham SR, Strehlow R, Manfredi M, Slocum P, Iverson K, West M, Ringler SL, Berry ZC. Widespread Neonatal Brain Damage following Calcium Channel Blockade. Dev Neurosci 2006; 29:213-31. [PMID: 16921238 DOI: 10.1159/000095221] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2006] [Accepted: 04/04/2006] [Indexed: 01/05/2023] Open
Abstract
An abundance of evidence exists that shows calcium channel blockade promotes injury in cultured neurons. However, few studies have addressed the in vivo toxicity of such agents. We now show that the L-type calcium channel antagonist nimodipine promotes widespread and robust injury throughout the neonatal rat brain, in an age-dependent manner. Using both isolated neuronal as well as brain slice approaches, we address mechanisms behind such injury. These expanded studies show a consistent pattern of injury using a variety of agents that lower intracellular calcium. Collectively, these observations indicate that postnatal brain development represents a transitional period for still developing neurons, from being highly sensitive to reductions in intracellular calcium to being less vulnerable to such changes. These observations directly relate to current therapeutic strategies targeting neonatal brain injury.
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Affiliation(s)
- C P Turner
- Department of Neurobiology and Anatomy, Wake Forest University Medical School, Medical Center Boulevard, Winston-Salem, NC 27157-1010, USA.
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Zhu XJ, Hua Y, Jiang J, Zhou QG, Luo CX, Han X, Lu YM, Zhu DY. Neuronal nitric oxide synthase-derived nitric oxide inhibits neurogenesis in the adult dentate gyrus by down-regulating cyclic AMP response element binding protein phosphorylation. Neuroscience 2006; 141:827-836. [PMID: 16735094 DOI: 10.1016/j.neuroscience.2006.04.032] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2005] [Revised: 04/13/2006] [Accepted: 04/14/2006] [Indexed: 12/27/2022]
Abstract
Neuronal nitric oxide synthase, the major nitric oxide synthase isoform in the mammalian brain, is implicated in some developmental processes, including neuronal survival, precursor proliferation and differentiation. However, reports about the role of neuronal nitric oxide synthase in neurogenesis in the adult dentate gyrus are conflicting. Here we show that 5-bromodeoxyuridine-labeled dividing progenitor cells in the dentate gyrus were significantly increased in mice receiving 7-nitroindazole, a selective neuronal nitric oxide synthase inhibitor, and in null mutant mice lacking neuronal nitric oxide synthase gene (nNOS-/-) 6 h and 4 weeks after 5-bromodeoxyuridine incorporation. The increase in 5-bromodeoxyuridine positive cells in 7-nitroindazole-treated mice was accompanied by activation of cyclic AMP response element binding protein phosphorylation in the dentate gyrus. Pretreatment with N-methyl-D-aspartate receptor antagonist MK-801 fully abolished the effects of 7-nitroindazole on neurogenesis and cyclic AMP response element binding protein phosphorylation. Furthermore, neuronal nitric oxide synthase inhibition significantly enhanced the survival of newborn cells and the number of 5-bromodeoxyuridine positive/NeuN positive cells in the dentate gyrus. These results indicate that neuronal nitric oxide synthase-derived nitric oxide suppresses neurogenesis in the adult dentate gyrus, in which N-methyl-D-aspartate receptor functions and cyclic AMP response element binding protein phosphorylation may be involved.
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Affiliation(s)
- X J Zhu
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, 140 Road Hanzhong, Nanjing, China 210029
| | - Y Hua
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, 140 Road Hanzhong, Nanjing, China 210029
| | - J Jiang
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, 140 Road Hanzhong, Nanjing, China 210029
| | - Q G Zhou
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, 140 Road Hanzhong, Nanjing, China 210029
| | - C X Luo
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, 140 Road Hanzhong, Nanjing, China 210029
| | - X Han
- Laboratory of Mammalian Genes, Nanjing Medical University, Nanjing, China 210029
| | - Y M Lu
- Biomolecular Science Center, Burnet College of Biomedical Science, University of Florida, Room 324/BMS, 4000 Central Florida Boulevard, Orlando, FL 32816, USA
| | - D Y Zhu
- Department of Pharmacology, School of Pharmacy, Nanjing Medical University, 140 Road Hanzhong, Nanjing, China 210029; Laboratory of Mammalian Genes, Nanjing Medical University, Nanjing, China 210029.
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Komitova M, Johansson BB, Eriksson PS. On neural plasticity, new neurons and the postischemic milieu: An integrated view on experimental rehabilitation. Exp Neurol 2006; 199:42-55. [PMID: 16631168 DOI: 10.1016/j.expneurol.2006.03.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2006] [Accepted: 03/05/2006] [Indexed: 12/18/2022]
Abstract
This review discusses actual and potential contributors to functional improvement after stroke injuries. Topics that will be covered are neuronal re-organization and sprouting, neural stem/progenitor cell activation and neuronal replacement, as well as the neuronal milieu defined by glia, inflammatory cells and blood vessel supply. It is well established that different types of neuronal plasticity ultimately lead to post-stroke recovery. However, an untapped potential which only recently has started to be extensively explored is neuronal replacement through endogenous or exogenous resources. Major experimental efforts are needed to achieve progress in this burgeoning area. The review stresses the importance of applying neurodevelopmental principles as well as performing a characterization of the role of the postischemic milieu when studying adult brain neural stem/progenitor cells. Integrated and multifaceted experimentation, incorporating actual and possible poststroke function modulators, will be necessary in order to determine future strategies that will ultimately enable considerable progress in the field of neurorehabilitation.
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Affiliation(s)
- Mila Komitova
- Arvid Carlsson Institute, Division for Clinical Neuroscience and Rehabilitation, Institute of Neuroscience and Physiology, The Sahlgrenska Academy at Göteborg University, Göteborg, Sweden.
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Xia CF, Smith RS, Shen B, Yang ZR, Borlongan CV, Chao L, Chao J. Postischemic brain injury is exacerbated in mice lacking the kinin B2 receptor. Hypertension 2006; 47:752-61. [PMID: 16534002 DOI: 10.1161/01.hyp.0000214867.35632.0e] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Kallikrein cleaves low molecular weight kininogen to generate vasoactive kinins, which bind to the kinin B2 receptor, triggering a host of biological effects. Kallikrein gene delivery has been shown previously to reduce ischemia/reperfusion-induced cerebral infarction. In this study, we tested the hypothesis that the kinin B2 receptor plays a protective role in ischemic brain injury using kinin B2 receptor gene knockout (B2R-KO) mice subjected to middle cerebral artery occlusion (MCAO). The mortality rate and neurological deficit scores of B2R-KO mice (n=48) after MCAO were significantly increased compared with wild-type (WT) mice (n=40) when examined over a 14-day period. In addition, the infarct volume in B2R-KO mice was significantly larger than in WT mice at days 1 and 3 after MCAO. Similarly, apoptotic cells, detected by TUNEL labeling counterstained with propidium iodide, and caspase-3 activity in the ischemic brain increased significantly in B2R-KO mice at days 1 and 3 after MCAO. Furthermore, the accumulation of neutrophils in the ischemic brain of B2R-KO mice after MCAO increased when compared with WT mice and was associated with elevated tumor necrosis factor alpha expression. These alterations in B2R-KO mice correlated with decreased NO levels, Akt, and glycogen synthase kinase-3beta phosphorylation and increased nicotinamide-adenine dinucleotide oxidase activity. These results indicate that the kinin B2 receptor promotes survival and protects against brain injury by suppression of apoptosis and inflammation induced by ischemic stroke.
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Affiliation(s)
- Chun-Fang Xia
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC 29425, USA
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