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Clarke BE, Taha DM, Tyzack GE, Patani R. Regionally encoded functional heterogeneity of astrocytes in health and disease: A perspective. Glia 2020; 69:20-27. [PMID: 32749770 DOI: 10.1002/glia.23877] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 06/04/2020] [Accepted: 06/05/2020] [Indexed: 12/11/2022]
Abstract
Increasing evidence has suggested that astrocytes demonstrate striking regionally allocated functional heterogeneity. Here, we discuss how this spatiotemporally encoded diversity determines the astrocytic phenotype along a finely grained spectrum from neuroprotective to deleterious states. With increasing recognition of their diverse and evolving roles in the central neuraxis, astrocytes now represent a tractable cellular target for therapies aiming to restore neural circuit integrity in a broad range of neurodegenerative disorders. Understanding the determinants of astrocyte physiology along with the true extent of heterogeneity in their regional and subregional functions will ultimately inform therapeutic strategy in neurodegenerative diseases.
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Affiliation(s)
- Benjamin E Clarke
- Department of Neuromuscular Disease, UCL Queen Square Institute of Neurology, Queen Square, London, UK.,The Francis Crick Institute, London, UK
| | - Doaa M Taha
- Department of Neuromuscular Disease, UCL Queen Square Institute of Neurology, Queen Square, London, UK.,The Francis Crick Institute, London, UK
| | - Giulia E Tyzack
- Department of Neuromuscular Disease, UCL Queen Square Institute of Neurology, Queen Square, London, UK.,The Francis Crick Institute, London, UK
| | - Rickie Patani
- Department of Neuromuscular Disease, UCL Queen Square Institute of Neurology, Queen Square, London, UK.,The Francis Crick Institute, London, UK
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Raimondi I, Izzo L, Tunesi M, Comar M, Albani D, Giordano C. Organ-On-A-Chip in vitro Models of the Brain and the Blood-Brain Barrier and Their Value to Study the Microbiota-Gut-Brain Axis in Neurodegeneration. Front Bioeng Biotechnol 2020; 7:435. [PMID: 31998702 PMCID: PMC6965718 DOI: 10.3389/fbioe.2019.00435] [Citation(s) in RCA: 68] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Accepted: 12/05/2019] [Indexed: 12/21/2022] Open
Abstract
We are accumulating evidence that intestinal microflora, collectively named gut microbiota, can alter brain pathophysiology, but researchers have just begun to discover the mechanisms of this bidirectional connection (often referred to as microbiota-gut-brain axis, MGBA). The most noticeable hypothesis for a pathological action of gut microbiota on the brain is based on microbial release of soluble neurotransmitters, hormones, immune molecules and neuroactive metabolites, but this complex scenario requires reliable and controllable tools for its causal demonstration. Thanks to three-dimensional (3D) cultures and microfluidics, engineered in vitro models could improve the scientific knowledge in this field, also from a therapeutic perspective. This review briefly retraces the main discoveries linking the activity of gut microbiota to prevalent brain neurodegenerative disorders, and then provides a deep insight into the state-of-the-art for in vitro modeling of the brain and the blood-brain barrier (BBB), two key players of the MGBA. Several brain and BBB microfluidic devices have already been developed to implement organ-on-a-chip solutions, but some limitations still exist. Future developments of organ-on-a-chip tools to model the MGBA will require an interdisciplinary approach and the synergy with cutting-edge technologies (for instance, bioprinting) to achieve multi-organ platforms and support basic research, also for the development of new therapies against neurodegenerative diseases.
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Affiliation(s)
- Ilaria Raimondi
- Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Milan, Italy
| | - Luca Izzo
- Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Milan, Italy
| | - Marta Tunesi
- Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Milan, Italy
| | - Manola Comar
- SSD of Advanced Translational Microbiology, IRCCS “Burlo Garofolo”, Department of Medical Sciences (DMS), University of Trieste, Trieste, Italy
| | - Diego Albani
- Department of Neuroscience, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milan, Italy
| | - Carmen Giordano
- Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Milan, Italy
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Asanuma M, Okumura-Torigoe N, Miyazaki I, Murakami S, Kitamura Y, Sendo T. Region-Specific Neuroprotective Features of Astrocytes against Oxidative Stress Induced by 6-Hydroxydopamine. Int J Mol Sci 2019; 20:ijms20030598. [PMID: 30704073 PMCID: PMC6387089 DOI: 10.3390/ijms20030598] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2019] [Revised: 01/28/2019] [Accepted: 01/28/2019] [Indexed: 01/09/2023] Open
Abstract
In previous studies, we found regional differences in the induction of antioxidative molecules in astrocytes against oxidative stress, postulating that region-specific features of astrocytes lead region-specific vulnerability of neurons. We examined region-specific astrocytic features against dopaminergic neurotoxin 6-hydroxydopamine (6-OHDA) as an oxidative stress using co-culture of mesencephalic neurons and mesencephalic or striatal astrocytes in the present study. The 6-OHDA-induced reduction of mesencephalic dopamine neurons was inhibited by co-culturing with astrocytes. The co-culture of midbrain neurons with striatal astrocytes was more resistant to 6-OHDA than that with mesencephalic astrocytes. Furthermore, glia conditioned medium from 6-OHDA-treated striatal astrocytes showed a greater protective effect on the 6-OHDA-induced neurotoxicity and oxidative stress than that from mesencephalic astrocytes. The cDNA microarray analysis showed that the number of altered genes in both mesencephalic and striatal astrocytes was fewer than that changed in either astrocyte. The 6-OHDA treatment, apparently up-regulated expressions of Nrf2 and some anti-oxidative or Nrf2-regulating phase II, III detoxifying molecules related to glutathione synthesis and export in the striatal astrocytes but not mesencephalic astrocytes. There is a profound regional difference of gene expression in astrocytes induced by 6-OHDA. These results suggest that protective features of astrocytes against oxidative stress are more prominent in striatal astrocytes, possibly by secreting humoral factors in striatal astrocytes.
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Affiliation(s)
- Masato Asanuma
- Department of Medical Neurobiology, Okayama University Graduate School of Medical, Dental and Pharmaceutical Sciences, Okayama 700-8558, Japan.
| | - Nao Okumura-Torigoe
- Department of Clinical Pharmacy, Okayama University Graduate School of Medical, Dental and Pharmaceutical Sciences, Okayama 700-8558, Japan.
| | - Ikuko Miyazaki
- Department of Medical Neurobiology, Okayama University Graduate School of Medical, Dental and Pharmaceutical Sciences, Okayama 700-8558, Japan.
| | - Shinki Murakami
- Department of Medical Neurobiology, Okayama University Graduate School of Medical, Dental and Pharmaceutical Sciences, Okayama 700-8558, Japan.
| | - Yoshihisa Kitamura
- Department of Clinical Pharmacy, Okayama University Graduate School of Medical, Dental and Pharmaceutical Sciences, Okayama 700-8558, Japan.
| | - Toshiaki Sendo
- Department of Clinical Pharmacy, Okayama University Graduate School of Medical, Dental and Pharmaceutical Sciences, Okayama 700-8558, Japan.
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Feng X, Bader BM, Yang F, Segura M, Schultz L, Schröder OHU, Rolfs A, Luo J. Improvement of impaired electrical activity in NPC1 mutant cortical neurons upon DHPG stimulation detected by micro-electrode array. Brain Res 2018; 1694:87-93. [PMID: 29753706 DOI: 10.1016/j.brainres.2018.05.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Revised: 04/20/2018] [Accepted: 05/09/2018] [Indexed: 12/20/2022]
Abstract
Niemann-Pick Type C1 (NPC1) disease is an autosomal recessive neurodegenerative disease characterized by an excessive accumulation of unesterified cholesterol in late endosomes/lysosomes. Patients with NPC1 disease show a series of symptoms in neuropathology, including a gradually increased loss of motor control and seizures. However, mechanism of the neurological manifestations in NPC1 disease is not fully understood yet. In this study, we utilized the micro-electrode array (MEA) to analyze the spontaneous extracellular electrical activity in cultivated cortical neurons of the NPC1 mutant (NPC1-/-) mouse. Our results show a decrease of the spontaneous electrical activity in NPC1-/- neuronal network when compared to wild type neurons, as indicated by the decreased spike rate, burst rate, event rate, and the increased burst period and event period. Application of 3,5-dihydroxyphenylglycine (DHPG), a specific agonist of group I metabotropic glutamate receptors, improved the electrical activity of the NPC1-/- neuronal network, suggesting that DHPG can be used as a potential therapeutic strategy for recovery of the electrical activity in NPC1 disease.
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Affiliation(s)
- Xiao Feng
- Albrecht-Kossel-Institute for Neuroregeneration, Rostock University Medical Center, Gehlsheimer Straße 20, 18147 Rostock, Germany
| | - Benjamin M Bader
- NeuroProof GmbH, Friedrich-Barnewitz-Straße 4, 18119 Rostock, Germany
| | - Fan Yang
- Albrecht-Kossel-Institute for Neuroregeneration, Rostock University Medical Center, Gehlsheimer Straße 20, 18147 Rostock, Germany
| | - Monica Segura
- NeuroProof GmbH, Friedrich-Barnewitz-Straße 4, 18119 Rostock, Germany
| | - Luise Schultz
- NeuroProof GmbH, Friedrich-Barnewitz-Straße 4, 18119 Rostock, Germany
| | - Olaf H-U Schröder
- NeuroProof GmbH, Friedrich-Barnewitz-Straße 4, 18119 Rostock, Germany
| | - Arndt Rolfs
- Albrecht-Kossel-Institute for Neuroregeneration, Rostock University Medical Center, Gehlsheimer Straße 20, 18147 Rostock, Germany
| | - Jiankai Luo
- Albrecht-Kossel-Institute for Neuroregeneration, Rostock University Medical Center, Gehlsheimer Straße 20, 18147 Rostock, Germany; Centre for Transdisciplinary Neuroscience Rostock, Rostock University Medical Center, Gehlsheimer Straße 20, 18147 Rostock, Germany.
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Kıray H, Lindsay SL, Hosseinzadeh S, Barnett SC. The multifaceted role of astrocytes in regulating myelination. Exp Neurol 2016; 283:541-9. [PMID: 26988764 PMCID: PMC5019113 DOI: 10.1016/j.expneurol.2016.03.009] [Citation(s) in RCA: 121] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 03/01/2016] [Accepted: 03/08/2016] [Indexed: 11/29/2022]
Abstract
Astrocytes are the major glial cell of the central nervous system (CNS), providing both metabolic and physical support to other neural cells. After injury, astrocytes become reactive and express a continuum of phenotypes which may be supportive or inhibitory to CNS repair. This review will focus on the ability of astrocytes to influence myelination in the context of specific secreted factors, cytokines and other neural cell targets within the CNS. In particular, we focus on how astrocytes provide energy and cholesterol to neurons, influence synaptogenesis, affect oligodendrocyte biology and instigate cross-talk between the many cellular components of the CNS.
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Affiliation(s)
- Hülya Kıray
- Institute of Infection, Inflammation and Immunity, Sir Graeme Davies Building, Glasgow Biomedical Research Centre, 120 University Place, University of Glasgow, Glasgow G12 8TA, United Kingdom
| | - Susan L Lindsay
- Institute of Infection, Inflammation and Immunity, Sir Graeme Davies Building, Glasgow Biomedical Research Centre, 120 University Place, University of Glasgow, Glasgow G12 8TA, United Kingdom
| | - Sara Hosseinzadeh
- Institute of Infection, Inflammation and Immunity, Sir Graeme Davies Building, Glasgow Biomedical Research Centre, 120 University Place, University of Glasgow, Glasgow G12 8TA, United Kingdom
| | - Susan C Barnett
- Institute of Infection, Inflammation and Immunity, Sir Graeme Davies Building, Glasgow Biomedical Research Centre, 120 University Place, University of Glasgow, Glasgow G12 8TA, United Kingdom..
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Dahlke C, Saberi D, Ott B, Brand-Saberi B, Schmitt-John T, Theiss C. Inflammation and neuronal death in the motor cortex of the wobbler mouse, an ALS animal model. J Neuroinflammation 2015; 12:215. [PMID: 26597538 PMCID: PMC4657283 DOI: 10.1186/s12974-015-0435-0] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Accepted: 11/16/2015] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disorder of the upper and lower motor neurons, characterized by rapid progressive weakness, muscle atrophy, dysarthria, dysphagia, and dyspnea. Whereas the exact cause of ALS remains uncertain, the wobbler mouse (phenotype WR; genotype wr/wr) equally develops a progressive degeneration of motor neurons in the spinal cord and motor cortex with striking similarities to sporadic human ALS, suggesting the possibility of a common pathway to cell death. METHODS With the aid of immunohistochemistry, confocal laser scanning microscopy, and transmission electron microscopy techniques, we analyze the proliferation behavior of microglial cells and astrocytes. We also investigate possible motor neuron death in the mouse motor cortex at different stages of the wobbler disease, which so far has not received much attention. RESULTS An abnormal density of Iba-1-positive microglial cells expressing pro-inflammatory tumor necrosis factor (TNF) alpha- and glial fibrillary acidic protein (GFAP)-positive activated astroglial cells was detected in the motor cortex region of the WR mouse 40 days postnatal (d.p.n.). Motor neurons in the same area show caspase 3 activation indicating neurodegenerative processes, which may cause progressive paralysis of the WR mice. It could also cause cell degeneration, such as vacuolization, dilation of the ER, and swollen mitochondria at the same time, and support the assumption that inflammation might be an important contributing factor of motor neuron degeneration. This would appear to be confirmed by the fact that there was no conspicuous increase of microglial cells and astrocytes in the motor cortex of control mice at any time. CONCLUSIONS Activated microglial cells secrete a variety of pro-inflammatory and neurotoxic factors, such as TNF alpha, which could initiate apoptotic processes in the affected wobbler motor neurons, as reflected by caspase 3 activation, and thus, the neuroinflammatory processes might influence or exacerbate the neurodegeneration. Although it remains to be clarified whether the immune response is primary or secondary and how harmful or beneficial it is in the WR motor neuron disease, anti-inflammatory treatment might be considered.
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Affiliation(s)
- Carolin Dahlke
- Department of Cytology, Institute of Anatomy, Ruhr University Bochum, Universitätsstraße 150, 44780, Bochum, Germany.
| | - Darius Saberi
- Department of Cytology, Institute of Anatomy, Ruhr University Bochum, Universitätsstraße 150, 44780, Bochum, Germany.
| | - Bastian Ott
- Department of Cytology, Institute of Anatomy, Ruhr University Bochum, Universitätsstraße 150, 44780, Bochum, Germany.
| | - Beate Brand-Saberi
- Department of Anatomy and Molecular Embryology, Institute of Anatomy, Ruhr University Bochum, Universitätsstraße 150, 44780, Bochum, Germany.
| | - Thomas Schmitt-John
- Department of Molecular Biology and Genetics, Molecular Cell and Developmental Biology, University of Aarhus, C.F. Møllers Allé 3, 8000, Aarhus, Denmark.
| | - Carsten Theiss
- Department of Cytology, Institute of Anatomy, Ruhr University Bochum, Universitätsstraße 150, 44780, Bochum, Germany.
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Safi R, Gardaneh M, Panahi Y, Maghsoudi N, Zaefizadeh M, Gharib E. Optimized quantities of GDNF overexpressed by engineered astrocytes are critical for protection of neuroblastoma cells against 6-OHDA toxicity. J Mol Neurosci 2011; 46:654-65. [PMID: 21969113 DOI: 10.1007/s12031-011-9654-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2011] [Accepted: 09/15/2011] [Indexed: 01/26/2023]
Abstract
Optimized levels of glial cell line-derived neurotrophic factor (GDNF) are critical for protection of dopaminergic neurons against parkinsonian cell death. Recombinant lentiviruses harboring GDNF coding sequence were constructed and used to infect astrocytoma cell line 1321N1. The infected astrocytes overexpressed GDNF mRNA and secreted an average of 2.2 ng/mL recombinant protein as tested in both 2 and 16 weeks post-infection. Serial dilutions of GDNF-enriched conditioned medium from infected astrocytes added to growing neuroblastoma cell line SK-N-MC resulted in commensurate resistance against 6-OHDA toxicity. SK-N-MC cell survival rate rose from 51% in control group to 84% in the cells grown with astro-CM containing 453 pg secreted GDNF, an increase that was highly significant (P < 0.0001). However, larger volumes of the GDNF-enriched conditioned medium failed to improve cell survival and addition of volumes that contained 1,600 pg or more GDNF further reduced survival rate to below 70%. Changes in cell survival paralleled to changes in the percent of apoptotic cell morphologies. These data demonstrate the feasibility of using astrocytes as minipumps to stably oversecrete neurotrophic factors and further indicate that GDNF can be applied to neuroprotection studies in PD pending the optimization of its concentrations.
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Affiliation(s)
- Roya Safi
- Molecular Genetics Group, National Institute of Genetic Engineering and Biotechnology (NIGEB), Pajoohesh Blvd, Tehran-Karaj HWY, Kilometer 15, PO Box 14965/161, Tehran, Iran
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Pyka M, Busse C, Seidenbecher C, Gundelfinger ED, Faissner A. Astrocytes are crucial for survival and maturation of embryonic hippocampal neurons in a neuron-glia cell-insert coculture assay. Synapse 2011; 65:41-53. [PMID: 20506382 DOI: 10.1002/syn.20816] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Synapses represent specialized cell-cell contact sites between nerve cells. These structures mediate the rapid and efficient transmission of signals between neurons and are surrounded by glial cells. Previous investigations have shown that astrocytes are important for the formation, maintenance, and function of CNS synapses. To study effects of glial-derived molecules on synaptogenesis, we have established an in vitro cell-insert coculture system for E18 rat hippocampal neurons and various glial cell types. Neurons were cultured without direct contact with glial cells for distinct time periods. First, it was confirmed that astrocytes are essential to promote survival of E18 hippocampal neurons. Beginning with 10 days in culture, the concurrent expression of pre- and postsynaptic proteins was observed. Moreover, the colocalization of the presynaptic marker Bassoon and the postsynaptic protein ProSAP1/Shank2 indicated the formation of synapses. A technique was developed that permits the semiautomated quantitative determination of the number of synaptic puncta per neuron. The culture system was used to assess effects of pharmacological treatments on synapse formation by applying blockers and activators of small GTPases. In particular, treatment with lysophosphatidic acid enhanced synaptogenesis in the coculture system.
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Affiliation(s)
- Martin Pyka
- Department of Cell Morphology and Molecular Neurobiology, Ruhr-University, D-44780 Bochum, Germany
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Kimura-Kuroda J, Teng X, Komuta Y, Yoshioka N, Sango K, Kawamura K, Raisman G, Kawano H. An in vitro model of the inhibition of axon growth in the lesion scar formed after central nervous system injury. Mol Cell Neurosci 2009; 43:177-87. [PMID: 19897043 DOI: 10.1016/j.mcn.2009.10.008] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2009] [Revised: 10/15/2009] [Accepted: 10/29/2009] [Indexed: 02/06/2023] Open
Abstract
After central nervous system (CNS) injury, meningeal fibroblasts migrate in the lesion center to form a fibrotic scar which is surrounded by end feet of reactive astrocytes. The fibrotic scar expresses various axonal growth-inhibitory molecules and creates a major impediment for axonal regeneration. We developed an in vitro model of the scar using coculture of cerebral astrocytes and meningeal fibroblasts by adding transforming growth factor-beta1 (TGF-beta1), a potent fibrogenic factor. Addition of TGF-beta1 to this coculture resulted in enhanced proliferation of fibroblasts and the formation of cell clusters which consisted of fibroblasts inside and surrounded by astrocytes. The cell cluster in culture densely accumulated the extracellular matrix molecules and axonal growth-inhibitory molecules similar to the fibrotic scar, and remarkably inhibited the neurite outgrowth of cerebellar neurons. Therefore, this culture system can be available to analyze the inhibitory property in the lesion site of CNS.
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Affiliation(s)
- Junko Kimura-Kuroda
- Department of Developmental Morphology, Tokyo Metropolitan Institute for Neuroscience, Tokyo, Japan
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Pérez-Capote K, Serratosa J, Solà C. Glial activation modulates glutamate neurotoxicity in cerebellar granule cell cultures. Glia 2003; 45:258-68. [PMID: 14730699 DOI: 10.1002/glia.10329] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We studied the influence of glial cells on the neuronal response to glutamate toxicity in cerebellar granule cell cultures. We compared the effect of glutamate on neuronal viability in neuronal vs. neuronal-glial cultures and determined this effect after pretreating the cultures with the lipopolysaccharide (LPS) of Escherichia coli, agent widely used to induce glial activation. Morphological changes in glial cells and nitric oxide (NO) production were evaluated as indicators of glial activation. We observed that glutamate neurotoxicity in neuronal-glial cultures was attenuated in a certain range of glutamate concentration when compared to neuronal cultures, but it was enhanced at higher glutamate concentrations. This enhanced neurotoxicity was associated with morphological changes in astrocytes and microglial cells in the absence of NO production. LPS treatment induced morphological changes in glial cells in neuronal-glial cultures as well as NO production. These effects occurred in the absence of significant neuronal death. However, when LPS-pretreated cultures were treated with glutamate, the sensitivity of neuronal-glial cultures to glutamate neurotoxicity was increased. This was accompanied by additional morphological changes in glial cells in the absence of a further increase in NO production. These results suggest that quiescent glial cells protect neuronal cells from glutamate neurotoxicity, but reactive glial cells increase glutamate neurotoxicity. Therefore, glial cells play a key role in the neuronal response to a negative stimulus, suggesting that this response can be modified through an action on glial cells.
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Affiliation(s)
- Kamil Pérez-Capote
- Department of Pharmacology and Toxicology, Institut d'Investigacions Biomèdiques de Barcelona-Consejo Superior de Investigaciones Cientificas (CSIC), Institut d'Investigacions Biomèdiques August Pi i Sunyer, Barcelona, Spain
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A�t-Ikhlef A, Hantaz-Ambroise D, Henderson C, Rieger F. Influence of factors secreted byWobbler astrocytes on neuronal and motoneuronal survival. J Neurosci Res 2000. [DOI: 10.1002/(sici)1097-4547(20000101)59:1<100::aid-jnr12>3.0.co;2-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Iwata-Ichikawa E, Kondo Y, Miyazaki I, Asanuma M, Ogawa N. Glial cells protect neurons against oxidative stress via transcriptional up-regulation of the glutathione synthesis. J Neurochem 1999; 72:2334-44. [PMID: 10349842 DOI: 10.1046/j.1471-4159.1999.0722334.x] [Citation(s) in RCA: 130] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
We examined the effects of oxidative stress on rat cultured mesencephalic neurons and glial cells. Glial cells were more resistant to 6-hydroxydopamine (6-OHDA) and H2O2 toxicity than neurons. In glial cells, incubation with 6-OHDA and H2O2 induced a significant increase in the expression of gamma-glutamylcysteine synthetase (the rate-limiting enzyme in glutathione synthesis) mRNA, which correlated well with increased TPA-response element (TRE)-binding activity. Furthermore, a subsequent elevation in cellular total glutathione content was also observed. In neurons, both agents decreased TRE-binding activity, and these cells failed to up-regulate the glutathione synthesis. We also examined the mechanisms of the neuroprotective effects of glial cells using a glia conditioned medium. Neurons maintained in glia conditioned medium up-regulated the level of TRE-binding activity, gamma-glutamylcysteine synthetase mRNA expression, and total glutathione content in response to 6-OHDA or H2O2, and became more resistant to both agents than cells maintained in a normal medium. Neurons maintained in normal medium failed to up-regulate the glutathione synthesis. Our results suggest that transcriptional up-regulation of glutathione synthesis in glial cell appears to mediate brain glial cell resistance against oxidative stress, and that glial cells protect neurons via transcriptional up-regulation of the antioxidant system.
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Affiliation(s)
- E Iwata-Ichikawa
- Department of Neuroscience, Institute of Molecular and Cellular Medicine, Okayama University Medical School, Japan
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