1
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Mittli D. Inflammatory processes in the prefrontal cortex induced by systemic immune challenge: Focusing on neurons. Brain Behav Immun Health 2023; 34:100703. [PMID: 38033612 PMCID: PMC10682838 DOI: 10.1016/j.bbih.2023.100703] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 10/30/2023] [Accepted: 11/04/2023] [Indexed: 12/02/2023] Open
Abstract
Peripheral immune challenge induces neurobiological alterations in the brain and related neuropsychiatric symptoms both in humans and other mammals. One of the best known physiological effects of systemic inflammation is sickness behavior. However, in addition to this depression-like state, there are other cognitive outcomes of peripherally induced neuroinflammation that can be linked to the dysfunction of higher-order cortical areas, such as the prefrontal cortex (PFC). As the physiological activity of the PFC is largely based on the balanced interplay of excitatory pyramidal cells and inhibitory interneurons, it may be hypothesized that neuroinflammatory processes result in a shift of excitatory/inhibitory balance, which is a common hallmark of several neuropsychiatric conditions. Indeed, many data suggest that peripherally induced neuroinflammation is strongly associated with molecular and functional changes in PFC neurons leading to disturbances in their synaptic networks. Different experimental approaches may cause some incongruence in the reviewed data. However, it is commonly agreed that acute systemic inflammation leads to changes in the excitatory/inhibitory balance in the PFC by proinflammatory signaling at the brain borders and in the brain parenchyma. These cellular changes result in altered local and brain-wide network activity inducing disturbances in the top-down control of goal-directed behavior and cognition regulated by the PFC. Lipopolysaccharide (LPS)-treated rodents are the most widely used experimental models of peripherally induced neuroinflammation, so the majority of the reviewed data come from studies utilizing the LPS model. This may limit their general interpretation regarding the neuronal effects of peripheral immune activation. In addition, several biological variables (e.g., sex, age) can influence the PFC effects of systemic immune challenge, not only the nature and severity of immune activation. Therefore, it would be desirable to investigate inflammation-related neuronal changes in the PFC using other models of systemic inflammation as well, and to focus on the targeted fine-tuning of the affected cell types via common molecular mechanisms of the immune and nervous systems.
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Affiliation(s)
- Dániel Mittli
- ELTE NAP Neuroimmunology Research Group, Department of Biochemistry, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary
- Laboratory of Proteomics, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary
- Department of Physiology and Neurobiology, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary
- InnoScience Ltd., Mátranovák, Hungary
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2
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Varodayan FP, Pahng AR, Davis TD, Gandhi P, Bajo M, Steinman MQ, Kiosses WB, Blednov YA, Burkart MD, Edwards S, Roberts AJ, Roberto M. Chronic ethanol induces a pro-inflammatory switch in interleukin-1β regulation of GABAergic signaling in the medial prefrontal cortex of male mice. Brain Behav Immun 2023; 110:125-139. [PMID: 36863493 PMCID: PMC10106421 DOI: 10.1016/j.bbi.2023.02.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 02/20/2023] [Accepted: 02/25/2023] [Indexed: 03/04/2023] Open
Abstract
Neuroimmune pathways regulate brain function to influence complex behavior and play a role in several neuropsychiatric diseases, including alcohol use disorder (AUD). In particular, the interleukin-1 (IL-1) system has emerged as a key regulator of the brain's response to ethanol (alcohol). Here we investigated the mechanisms underlying ethanol-induced neuroadaptation of IL-1β signaling at GABAergic synapses in the prelimbic region of the medial prefrontal cortex (mPFC), an area responsible for integrating contextual information to mediate conflicting motivational drives. We exposed C57BL/6J male mice to the chronic intermittent ethanol vapor-2 bottle choice paradigm (CIE-2BC) to induce ethanol dependence, and conducted ex vivo electrophysiology and molecular analyses. We found that the IL-1 system regulates basal mPFC function through its actions at inhibitory synapses on prelimbic layer 2/3 pyramidal neurons. IL-1β can selectively recruit either neuroprotective (PI3K/Akt) or pro-inflammatory (MyD88/p38 MAPK) mechanisms to produce opposing synaptic effects. In ethanol naïve conditions, there was a strong PI3K/Akt bias leading to a disinhibition of pyramidal neurons. Ethanol dependence produced opposite IL-1 effects - enhanced local inhibition via a switch in IL-1β signaling to the canonical pro-inflammatory MyD88 pathway. Ethanol dependence also increased cellular IL-1β in the mPFC, while decreasing expression of downstream effectors (Akt, p38 MAPK). Thus, IL-1β may represent a key neural substrate in ethanol-induced cortical dysfunction. As the IL-1 receptor antagonist (kineret) is already FDA-approved for other diseases, this work underscores the high therapeutic potential of IL-1 signaling/neuroimmune-based treatments for AUD.
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Affiliation(s)
- F P Varodayan
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA, USA; Developmental Exposure Alcohol Research Center and Behavioral Neuroscience Program, Department of Psychology, Binghamton University-SUNY, Binghamton, NY, USA
| | - A R Pahng
- Department of Physiology, Louisiana State University Health Sciences Center, New Orleans, LA, USA; Southeast Louisiana Veterans Health Care System, New Orleans, LA, USA
| | - T D Davis
- Department of Chemistry & Biochemistry, University of California, San Diego, La Jolla, CA, USA; Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, Binghamton University-SUNY, Binghamton, NY, USA
| | - P Gandhi
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA, USA
| | - M Bajo
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA, USA
| | - M Q Steinman
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA, USA
| | - W B Kiosses
- Microscopy Core Imaging Facility, La Jolla Institute for Immunology, La Jolla, CA 92037, USA
| | - Y A Blednov
- Waggoner Center for Alcohol and Addiction Research, University of Texas at Austin, Austin, TX 78712, USA
| | - M D Burkart
- Department of Chemistry & Biochemistry, University of California, San Diego, La Jolla, CA, USA
| | - S Edwards
- Department of Physiology, Louisiana State University Health Sciences Center, New Orleans, LA, USA
| | - A J Roberts
- Animal Models Core Facility, The Scripps Research Institute, La Jolla, CA, USA
| | - M Roberto
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA, USA.
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3
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Mittli D, Tukacs V, Ravasz L, Csősz É, Kozma T, Kardos J, Juhász G, Kékesi KA. LPS-induced acute neuroinflammation, involving interleukin-1 beta signaling, leads to proteomic, cellular, and network-level changes in the prefrontal cortex of mice. Brain Behav Immun Health 2023; 28:100594. [PMID: 36713475 PMCID: PMC9880243 DOI: 10.1016/j.bbih.2023.100594] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 12/12/2022] [Accepted: 01/16/2023] [Indexed: 01/22/2023] Open
Abstract
Neuroinflammation induced by peripheral infections leads to various neuropsychiatric symptoms both in humans and laboratory animals, e.g., to the manifestation of sickness behavior that resembles some features of clinical depression. However, in addition to depression-like behavior, there are other symptoms of acute systemic inflammation that can be associated with the impairment of prefrontal cortex (PFC)-regulated cognitive functions. Thus, we investigated the electrophysiological and proteomic alterations of the PFC using brain slices and the lipopolysaccharide (LPS) model of acute peripheral infection in male mice. Based on the gene expression differences of the coreceptor (Il1rap) of interleukin-1 beta (IL-1β) between neuron types in our previous single-cell sequencing dataset, we first compared the electrophysiological effects of IL-1β on PFC pyramidal cells and interneurons. We found that pyramidal cells are more responsive to IL-1β, as could be presumed from our transcriptomic data. To examine the possible circuit-level correlates of the cellular changes, frontal electroencephalographic (EEG) activity and fronto-occipital functional connectivity were analyzed in LPS-treated mice and significant changes were found in the fronto-occipital EEG correlation and coherence in the delta and high-gamma frequency bands. The upregulation of the prefrontal IL-1 system (IL-1β and its receptor) after LPS treatment was revealed by immunoassays simultaneously with the observed EEG changes. Furthermore, we investigated the LPS-induced alterations of the synaptic proteome in the PFC using 2-D differential gel electrophoresis and mass spectrometry and found 48 altered proteins mainly related to cellular signaling, cytoskeletal organization, and carbohydrate/energy metabolism. Thus, our results indicate remarkable electrophysiological and molecular changes in the PFC related to acute systemic inflammation that may explain some of the concomitant behavioral and physiological symptoms.
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Affiliation(s)
- Dániel Mittli
- ELTE NAP Neuroimmunology Research Group, Department of Biochemistry, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary
- Laboratory of Proteomics, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary
- Department of Physiology and Neurobiology, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary
| | - Vanda Tukacs
- ELTE NAP Neuroimmunology Research Group, Department of Biochemistry, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary
- Laboratory of Proteomics, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary
| | - Lilla Ravasz
- Laboratory of Proteomics, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary
- CRU Hungary Ltd., Göd, Hungary
| | - Éva Csősz
- Proteomics Core Facility, Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | | | - József Kardos
- ELTE NAP Neuroimmunology Research Group, Department of Biochemistry, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary
| | - Gábor Juhász
- ELTE NAP Neuroimmunology Research Group, Department of Biochemistry, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary
- Laboratory of Proteomics, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary
- CRU Hungary Ltd., Göd, Hungary
- InnoScience Ltd., Mátranovák, Hungary
| | - Katalin Adrienna Kékesi
- ELTE NAP Neuroimmunology Research Group, Department of Biochemistry, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary
- Laboratory of Proteomics, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary
- Department of Physiology and Neurobiology, Institute of Biology, ELTE Eötvös Loránd University, Budapest, Hungary
- InnoScience Ltd., Mátranovák, Hungary
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Abstract
Interleukin-1 (IL-1) is an inflammatory cytokine that has been shown to modulate neuronal signaling in homeostasis and diseases. In homeostasis, IL-1 regulates sleep and memory formation, whereas in diseases, IL-1 impairs memory and alters affect. Interestingly, IL-1 can cause long-lasting changes in behavior, suggesting IL-1 can alter neuroplasticity. The neuroplastic effects of IL-1 are mediated via its cognate receptor, Interleukin-1 Type 1 Receptor (IL-1R1), and are dependent on the distribution and cell type(s) of IL-1R1 expression. Recent reports found that IL-1R1 expression is restricted to discrete subpopulations of neurons, astrocytes, and endothelial cells and suggest IL-1 can influence neural circuits directly through neuronal IL-1R1 or indirectly via non-neuronal IL-1R1. In this review, we analyzed multiple mechanisms by which IL-1/IL-1R1 signaling might impact neuroplasticity based upon the most up-to-date literature and provided potential explanations to clarify discrepant and confusing findings reported in the past.
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Affiliation(s)
- Daniel P. Nemeth
- Division of Biosciences, College of Dentistry, The Ohio State University, Columbus, OH, USA
- Department of Biomedical Science, Charles E. Schmidt College of Medicine and Brain Institute, Florida Atlantic University, Jupiter, FL, USA
| | - Ning Quan
- Department of Biomedical Science, Charles E. Schmidt College of Medicine and Brain Institute, Florida Atlantic University, Jupiter, FL, USA
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Pinteaux E, Abdulaal WH, Mufazalov IA, Humphreys NE, Simonsen-Jackson M, Francis S, Müller W, Waisman A. Cell-specific conditional deletion of interleukin-1 (IL-1) ligands and its receptors: a new toolbox to study the role of IL-1 in health and disease. J Mol Med (Berl) 2020; 98:923-930. [PMID: 32468079 PMCID: PMC7343756 DOI: 10.1007/s00109-020-01928-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 05/15/2020] [Accepted: 05/20/2020] [Indexed: 01/08/2023]
Abstract
The pro-inflammatory cytokine interleukin-1 (IL-1) plays a key role in many physiological processes and during the inflammatory and immune response to most common diseases. IL-1 exists as two agonists, IL-1α and IL-1β that bind to the only signaling IL-1 type 1 receptor (IL-1R1), while a second decoy IL-1 type 2 receptor (IL-1R2) binds both forms of IL-1 without inducing cell signaling. The field of immunology and inflammation research has, over the past 35 years, unraveled many mechanisms of IL-1 actions, through in vitro manipulation of the IL-1 system or by using genetically engineered mouse models that lack either member of the IL-1 family in ubiquitous constitutive manner. However, the limitation of global mouse knockout technology has significantly hampered our understanding of the precise mechanisms of IL-1 actions in animal models of disease. Here we report and review the recent generation of new conditional mouse mutants in which exons of Il1a, Il1b, Il1r1, and Il1r2 genes flanked by loxP sites (fl/fl) can be deleted in cell-/tissue-specific constitutive or inducible manner by Cre recombinase expression. Hence, IL-1αfl/fl, IL-1βfl/fl, IL-1R1fl/fl, and IL-1R2fl/fl mice constitute a new toolbox that will provide a step change in our understanding of the cell-specific role of IL-1 and its receptor in health and disease and the potential development of targeted IL-1 therapies.
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Affiliation(s)
- Emmanuel Pinteaux
- Faculty of Biology, Medicine and Health, University of Manchester, AV Hill Building, Oxford Road, Manchester, M13 9PT, United Kingdom.
| | - Wesam H Abdulaal
- Faculty of Biology, Medicine and Health, University of Manchester, AV Hill Building, Oxford Road, Manchester, M13 9PT, United Kingdom
- Biochemistry Department, Faculty of Sciences, King Abdulaziz University, P.O.BOX 80203, Jeddah, 21589, Kingdom of Saudi Arabia
| | - Ilgiz A Mufazalov
- Institute for Molecular Medicine, University Medical Center of the Johannes Gutenberg-University of Mainz, Langenbeckstrasse 1, Building 308A, 55131, Mainz, Germany
| | - Neil E Humphreys
- Faculty of Biology, Medicine and Health, University of Manchester, AV Hill Building, Oxford Road, Manchester, M13 9PT, United Kingdom
- Epigenetics and Neurobiology Unit, Adriano Buzzati-Traverso Campus, EMBL-Rome, Via Ramarini, 3200015, Monterotondo, RM, Italy
| | - Maj Simonsen-Jackson
- Faculty of Biology, Medicine and Health, University of Manchester, AV Hill Building, Oxford Road, Manchester, M13 9PT, United Kingdom
| | - Sheila Francis
- Department of Infection, Immunity & Cardiovascular Disease, Medical School, University of Sheffield, S10 2RX, Sheffield, United Kingdom
| | - Werner Müller
- Faculty of Biology, Medicine and Health, University of Manchester, AV Hill Building, Oxford Road, Manchester, M13 9PT, United Kingdom
| | - Ari Waisman
- Institute for Molecular Medicine, University Medical Center of the Johannes Gutenberg-University of Mainz, Langenbeckstrasse 1, Building 308A, 55131, Mainz, Germany
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6
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Wong R, Lénárt N, Hill L, Toms L, Coutts G, Martinecz B, Császár E, Nyiri G, Papaemmanouil A, Waisman A, Müller W, Schwaninger M, Rothwell N, Francis S, Pinteaux E, Denés A, Allan SM. Interleukin-1 mediates ischaemic brain injury via distinct actions on endothelial cells and cholinergic neurons. Brain Behav Immun 2019; 76:126-138. [PMID: 30453020 PMCID: PMC6363965 DOI: 10.1016/j.bbi.2018.11.012] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 11/12/2018] [Accepted: 11/15/2018] [Indexed: 12/17/2022] Open
Abstract
The cytokine interleukin-1 (IL-1) is a key contributor to neuroinflammation and brain injury, yet mechanisms by which IL-1 triggers neuronal injury remain unknown. Here we induced conditional deletion of IL-1R1 in brain endothelial cells, neurons and blood cells to assess site-specific IL-1 actions in a model of cerebral ischaemia in mice. Tamoxifen treatment of IL-1R1 floxed (fl/fl) mice crossed with mice expressing tamoxifen-inducible Cre-recombinase under the Slco1c1 promoter resulted in brain endothelium-specific deletion of IL-1R1 and a significant decrease in infarct size (29%), blood-brain barrier (BBB) breakdown (53%) and neurological deficit (40%) compared to vehicle-treated or control (IL-1R1fl/fl) mice. Absence of brain endothelial IL-1 signalling improved cerebral blood flow, followed by reduced neutrophil infiltration and vascular activation 24 h after brain injury. Conditional IL-1R1 deletion in neurons using tamoxifen inducible nestin-Cre mice resulted in reduced neuronal injury (25%) and altered microglia-neuron interactions, without affecting cerebral perfusion or vascular activation. Deletion of IL-1R1 specifically in cholinergic neurons reduced infarct size, brain oedema and improved functional outcome. Ubiquitous deletion of IL-1R1 had no effect on brain injury, suggesting beneficial compensatory mechanisms on other cells against the detrimental effects of IL-1 on endothelial cells and neurons. We also show that IL-1R1 signalling deletion in platelets or myeloid cells does not contribute to brain injury after experimental stroke. Thus, brain endothelial and neuronal (cholinergic) IL-1R1 mediate detrimental actions of IL-1 in the brain in ischaemic stroke. Cell-specific targeting of IL-1R1 in the brain could therefore have therapeutic benefits in stroke and other cerebrovascular diseases.
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Affiliation(s)
- Raymond Wong
- Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT Manchester, UK
| | - Nikolett Lénárt
- "Momentum" Laboratory of Neuroimmunology, Institute of Experimental Medicine, Szigony u. 43, 1083 Budapest, Hungary
| | - Laura Hill
- Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT Manchester, UK
| | - Lauren Toms
- Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT Manchester, UK
| | - Graham Coutts
- Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT Manchester, UK
| | - Bernadett Martinecz
- "Momentum" Laboratory of Neuroimmunology, Institute of Experimental Medicine, Szigony u. 43, 1083 Budapest, Hungary
| | - Eszter Császár
- "Momentum" Laboratory of Neuroimmunology, Institute of Experimental Medicine, Szigony u. 43, 1083 Budapest, Hungary
| | - Gábor Nyiri
- Laboratory of Cerebral Cortex Research, Institute of Experimental Medicine, Szigony u. 43, 1083 Budapest, Hungary
| | - Athina Papaemmanouil
- Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT Manchester, UK
| | - Ari Waisman
- Institute for Molecular Medicine, University Medical Center of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany
| | - Werner Müller
- Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT Manchester, UK
| | - Markus Schwaninger
- Institute of Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, 23538 Lübeck, Germany
| | - Nancy Rothwell
- Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT Manchester, UK
| | - Sheila Francis
- Department of Infection, Immunity & Cardiovascular Disease, Medical School, University of Sheffield, S10 2RX Sheffield, UK
| | - Emmanuel Pinteaux
- Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT Manchester, UK
| | - Adam Denés
- "Momentum" Laboratory of Neuroimmunology, Institute of Experimental Medicine, Szigony u. 43, 1083 Budapest, Hungary.
| | - Stuart M Allan
- Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT Manchester, UK.
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7
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Barroeta-Espar I, Weinstock LD, Perez-Nievas BG, Meltzer AC, Siao Tick Chong M, Amaral AC, Murray ME, Moulder KL, Morris JC, Cairns NJ, Parisi JE, Lowe VJ, Petersen RC, Kofler J, Ikonomovic MD, López O, Klunk WE, Mayeux RP, Frosch MP, Wood LB, Gomez-Isla T. Distinct cytokine profiles in human brains resilient to Alzheimer's pathology. Neurobiol Dis 2018; 121:327-337. [PMID: 30336198 DOI: 10.1016/j.nbd.2018.10.009] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Revised: 10/03/2018] [Accepted: 10/12/2018] [Indexed: 12/29/2022] Open
Abstract
Our group has previously studied the brains of some unique individuals who are able to tolerate robust amounts of Alzheimer's pathological lesions (amyloid plaques and neurofibrillary tangles) without experiencing dementia while alive. These rare resilient cases do not demonstrate the patterns of neuronal/synaptic loss that are normally found in the brains of typical demented Alzheimer's patients. Moreover, they exhibit decreased astrocyte and microglial activation markers GFAP and CD68, suggesting that a suppressed neuroinflammatory response may be implicated in human brain resilience to Alzheimer's pathology. In the present work, we used a multiplexed immunoassay to profile a panel of 27 cytokines in the brains of controls, typical demented Alzheimer's cases, and two groups of resilient cases, which possessed pathology consistent with either high probability (HP, Braak stage V-VI and CERAD 2-3) or intermediate probability (IP, Braak state III-IV and CERAD 1-3) of Alzheimer's disease in the absence of dementia. We used a multivariate partial least squares regression approach to study differences in cytokine expression between resilient cases and both Alzheimer's and control cases. Our analysis identified distinct profiles of cytokines in the entorhinal cortex (one of the earliest and most severely affected brain regions in Alzheimer's disease) that are up-regulated in both HP and IP resilient cases relative to Alzheimer's and control cases. These cytokines, including IL-1β, IL-6, IL-13, and IL-4 in HP resilient cases and IL-6, IL-10, and IP-10 in IP resilient cases, delineate differential inflammatory activity in brains resilient to Alzheimer's pathology compared to Alzheimer's cases. Of note, these cytokines all have been associated with pathogen clearance and/or the resolution of inflammation. Moreover, our analysis in the superior temporal sulcus (a multimodal association cortex that consistently accumulates Alzheimer's pathology at later stages of the disease along with overt symptoms of dementia) revealed increased expression of neurotrophic factors, such as PDGF-bb and basic FGF in resilient compared to AD cases. The same region also had reduced expression of chemokines associated with microglial recruitment, including MCP-1 in HP resilient cases and MIP-1α in IP resilient cases compared to AD. Altogether, our data suggest that different patterns of cytokine expression exist in the brains of resilient and Alzheimer's cases, link these differences to reduced glial activation, increased neuronal survival and preserved cognition in resilient cases, and reveal specific cytokine targets that may prove relevant to the identification of novel mechanisms of brain resiliency to Alzheimer's pathology.
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Affiliation(s)
- Isabel Barroeta-Espar
- Massachusetts General Hospital ADRC, Harvard University, 15 Parkman St #835, Boston, MA 02114, United States
| | - Laura D Weinstock
- Parker H. Petit Institute for Bioengineering & Bioscience, Georgia Institute of Technology, 315 Ferst Dr, Atlanta, GA 30332, United States; Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, North Ave NW, Atlanta, GA 30332, United States.
| | - Beatriz G Perez-Nievas
- Massachusetts General Hospital ADRC, Harvard University, 15 Parkman St #835, Boston, MA 02114, United States
| | - Avery C Meltzer
- Massachusetts General Hospital ADRC, Harvard University, 15 Parkman St #835, Boston, MA 02114, United States
| | - Michael Siao Tick Chong
- Massachusetts General Hospital ADRC, Harvard University, 15 Parkman St #835, Boston, MA 02114, United States
| | - Ana C Amaral
- Massachusetts General Hospital ADRC, Harvard University, 15 Parkman St #835, Boston, MA 02114, United States.
| | - Melissa E Murray
- Department of Neuroscience, Mayo Clinic, 4500 San Pablo Road South, Jacksonville, FL 32224, United States.
| | - Krista L Moulder
- Department of Neurology, Knight Alzheimer Disease Research Center, Washington University, 1 Brookings Dr, St. Louis, MO 63130, United States.
| | - John C Morris
- Department of Neurology, Knight Alzheimer Disease Research Center, Washington University, 1 Brookings Dr, St. Louis, MO 63130, United States.
| | - Nigel J Cairns
- Department of Neurology, Knight Alzheimer Disease Research Center, Washington University, 1 Brookings Dr, St. Louis, MO 63130, United States.
| | - Joseph E Parisi
- Department of Neurology, Mayo Clinic, 200 1st St SW, Rochester, MN 55905, United States.
| | - Val J Lowe
- Department of Radiology, Mayo Clinic, 200 1st St SW, Rochester, MN 55905, United States.
| | - Ronald C Petersen
- Department of Neurology, Mayo Clinic, 200 1st St SW, Rochester, MN 55905, United States.
| | - Julia Kofler
- Department of Pathology, University of Pittsburgh School of Medicine, 4200 Fifth Ave, Pittsburgh, PA 15260, United States.
| | - Milos D Ikonomovic
- Department of Neurology, University of Pittsburgh School of Medicine, 4200 Fifth Ave, Pittsburgh, PA 15260, United States; Department of Psychiatry, University of Pittsburgh School of Medicine, 3811 DeSoto Street, Pittsburgh, PA 15260, United States.
| | - Oscar López
- Department of Neurology, University of Pittsburgh School of Medicine, 4200 Fifth Ave, Pittsburgh, PA 15260, United States.
| | - William E Klunk
- Department of Psychiatry, University of Pittsburgh School of Medicine, 3811 DeSoto Street, Pittsburgh, PA 15260, United States
| | - Richard P Mayeux
- The Taub Institute for Research on Alzheimer's Disease and the Aging Brain and The Gertrude H. Sergievsky Center, Columbia University, 116th St & Broadway, New York, NY 10027, United States.
| | - Matthew P Frosch
- Massachusetts General Hospital ADRC, Harvard University, 15 Parkman St #835, Boston, MA 02114, United States.
| | - Levi B Wood
- Parker H. Petit Institute for Bioengineering & Bioscience, Georgia Institute of Technology, 315 Ferst Dr, Atlanta, GA 30332, United States; Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, North Ave NW, Atlanta, GA 30332, United States; Georgia W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 315 Ferst Dr, Atlanta, GA 30332, United States; Beth Israel Deaconess Cancer Center, 330 Brookline Ave, Boston, MA 02215, United States.
| | - Teresa Gomez-Isla
- Massachusetts General Hospital ADRC, Harvard University, 15 Parkman St #835, Boston, MA 02114, United States.
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8
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Xiao Z, Peng J, Wu L, Arafat A, Yin F. The effect of IL-1β on synaptophysin expression and electrophysiology of hippocampal neurons through the PI3K/Akt/mTOR signaling pathway in a rat model of mesial temporal lobe epilepsy. Neurol Res 2017; 39:640-648. [PMID: 28372486 DOI: 10.1080/01616412.2017.1312070] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Zhaohua Xiao
- Department of Pediatrics, Xiangya Hospital of Central South University, Changsha, China
| | - Jing Peng
- Department of Pediatrics, Xiangya Hospital of Central South University, Changsha, China
- Hunan Intellectual and Developmental Disabilities Research Center of Children, Changsha, China
| | - Liwen Wu
- Department of Pediatrics, Xiangya Hospital of Central South University, Changsha, China
| | - Ahmed Arafat
- Department of Pediatrics, Xiangya Hospital of Central South University, Changsha, China
| | - Fei Yin
- Department of Pediatrics, Xiangya Hospital of Central South University, Changsha, China
- Hunan Intellectual and Developmental Disabilities Research Center of Children, Changsha, China
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9
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Gadani SP, Smirnov I, Smith AT, Overall CC, Kipnis J. Characterization of meningeal type 2 innate lymphocytes and their response to CNS injury. J Exp Med 2016; 214:285-296. [PMID: 27994070 PMCID: PMC5294864 DOI: 10.1084/jem.20161982] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2016] [Revised: 12/09/2016] [Accepted: 12/13/2016] [Indexed: 01/06/2023] Open
Abstract
The meningeal space is occupied by a diverse repertoire of immune cells. Central
nervous system (CNS) injury elicits a rapid immune response that affects
neuronal survival and recovery, but the role of meningeal inflammation remains
poorly understood. Here, we describe type 2 innate lymphocytes (ILC2s) as a
novel cell type resident in the healthy meninges that are activated after CNS
injury. ILC2s are present throughout the naive mouse meninges, though are
concentrated around the dural sinuses, and have a unique transcriptional
profile. After spinal cord injury (SCI), meningeal ILC2s are activated in an
IL-33–dependent manner, producing type 2 cytokines. Using RNAseq, we
characterized the gene programs that underlie the ILC2 activation state.
Finally, addition of wild-type lung-derived ILC2s into the meningeal space of
IL-33R−/− animals partially improves recovery after
SCI. These data characterize ILC2s as a novel meningeal cell type that responds
to SCI and could lead to new therapeutic insights for neuroinflammatory
conditions.
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Affiliation(s)
- Sachin P Gadani
- Center for Brain Immunology and Glia (BIG), University of Virginia, Charlottesville, VA 22908 .,Department of Neuroscience, University of Virginia, Charlottesville, VA 22908.,Graduate Program in Neuroscience, University of Virginia, Charlottesville, VA 22908.,Medical Scientist Training Program, University of Virginia, Charlottesville, VA 22908
| | - Igor Smirnov
- Center for Brain Immunology and Glia (BIG), University of Virginia, Charlottesville, VA 22908.,Department of Neuroscience, University of Virginia, Charlottesville, VA 22908
| | - Ashtyn T Smith
- Center for Brain Immunology and Glia (BIG), University of Virginia, Charlottesville, VA 22908.,Department of Neuroscience, University of Virginia, Charlottesville, VA 22908.,Graduate Program in Neuroscience, University of Virginia, Charlottesville, VA 22908
| | - Christopher C Overall
- Center for Brain Immunology and Glia (BIG), University of Virginia, Charlottesville, VA 22908.,Department of Neuroscience, University of Virginia, Charlottesville, VA 22908
| | - Jonathan Kipnis
- Center for Brain Immunology and Glia (BIG), University of Virginia, Charlottesville, VA 22908 .,Department of Neuroscience, University of Virginia, Charlottesville, VA 22908.,Graduate Program in Neuroscience, University of Virginia, Charlottesville, VA 22908.,Medical Scientist Training Program, University of Virginia, Charlottesville, VA 22908
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10
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Fang M, Yuan Y, Rangarajan P, Lu J, Wu Y, Wang H, Wu C, Ling EA. Scutellarin regulates microglia-mediated TNC1 astrocytic reaction and astrogliosis in cerebral ischemia in the adult rats. BMC Neurosci 2015; 16:84. [PMID: 26608466 PMCID: PMC4660684 DOI: 10.1186/s12868-015-0219-6] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2015] [Accepted: 11/13/2015] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Scutellarin, an anti-inflammatory agent, effectively suppressed microglia activation in rats with middle cerebral artery occlusion (MCAO). Robust microglia activation, acute in onset, was followed by astrogliosis. This study was aimed to determine if scutellarin would also affect the reactive astrocytes that play an important role in tissue repair. Expression of GFAP and Notch-1 and its members: Notch receptor intracellular domain (NICD), and transcription factor hairy and enhancer of split-1 (HES-1), together with nestin and proinflammatory mediators was assessed by immunofluorescence staining in TNC1 astrocytes treated, respectively, with BV-2 conditioned medium (CM) and CM + lipopolysaccharide (LPS) (CM + L) serving as the controls, and conditioned medium derived from LPS-activated BV-2 cells pretreated with scutellarin (CM + SL). Study of the above biomarkers was then extended to reactive astrocytes in scutellarin injected MCAO rats. RESULTS TNC1 astrocytes remained relatively unreactive in terms of expression of different biomarkers to direct scutellarin treatment when compared with the control cells. In comparison to cells in the control medium (CM, CM + L), they responded vigorously to CM + SL as evidenced by the enhanced protein expression of GFAP, Notch-1, NICD and HES-1 coupled with that of nestin, TNF-α, IL-1β, and iNOS by Western and immunofluorescence analysis. Electron microscopy showed marked hypertrophy and cell expansion of TNC1 astrocytes bearing many filamentous processes indicative of enhanced astrocyte reaction when treated with CM + SL. In MCAO rats, scutellarin also augmented the expression of the above markers in reactive astrocytes; moreover, astrocytes were evidently hypertrophic. CONCLUSIONS The results suggest that scutellarin regulates astrogliosis; more importantly, it is microglia-mediated as demonstrated in vitro. Increased expression of Notch signaling in synchrony with nestin may be linked to proliferation and "de-differentiation" of reactive astrocytes; the significance of enhanced TNF-α, IL-1β and iNOS expression in reactive astrocytes by scutellarin may be neuroprotective but this remains speculative.
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Affiliation(s)
- Ming Fang
- Department of Emergency and Critical Care, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China.
- Department of Anatomy, Yong Loo Lin School of Medicine, National University of Singapore, 4 Medical Drive, MD10, Singapore, 117594, Singapore.
| | - Yun Yuan
- Department of Anatomy and Histology/Embryology, Faculty of Basic Medical Sciences, Kunming Medical University, 1168 West Chunrong Road, Kunming, 650500, Peoples' Republic of China.
| | - Parakalan Rangarajan
- Department of Anatomy, Yong Loo Lin School of Medicine, National University of Singapore, 4 Medical Drive, MD10, Singapore, 117594, Singapore.
| | - Jia Lu
- Department of Anatomy, Yong Loo Lin School of Medicine, National University of Singapore, 4 Medical Drive, MD10, Singapore, 117594, Singapore.
- Defence Medical and Environmental Research Institute, DSO National Laboratories, 27 Medical Drive, Singapore, 117510, Singapore.
| | - Yajun Wu
- Department of Anatomy, Yong Loo Lin School of Medicine, National University of Singapore, 4 Medical Drive, MD10, Singapore, 117594, Singapore.
| | - Huadong Wang
- Department of Pathophysiology, School of Medicine, Jinan University, Guangzhou, 510632, China.
| | - Chunyun Wu
- Department of Anatomy and Histology/Embryology, Faculty of Basic Medical Sciences, Kunming Medical University, 1168 West Chunrong Road, Kunming, 650500, Peoples' Republic of China.
| | - Eng-Ang Ling
- Department of Anatomy, Yong Loo Lin School of Medicine, National University of Singapore, 4 Medical Drive, MD10, Singapore, 117594, Singapore.
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11
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Chen J, Hou N, Zhang C, Teng Y, Cheng X, Li Z, Ren J, Zeng J, Li R, Wang W, Yang X, Lan Y. Smooth Muscle Hgs Deficiency Leads to Impaired Esophageal Motility. Int J Biol Sci 2015; 11:794-802. [PMID: 26078721 PMCID: PMC4466460 DOI: 10.7150/ijbs.12248] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Accepted: 04/13/2015] [Indexed: 02/07/2023] Open
Abstract
As a master component of endosomal sorting complex required for transport proteins, hepatocyte growth factor-regulated tyrosine kinase substrate (Hgs) participates multiple cellular behaviors. However, the physiological role of Hgs in smooth muscle cells (SMCs) is by far unknown. Here we explored the in vivo function of Hgs in SMCs by using a conditional gene knockout strategy. Hgs deficiency in SMCs uniquely led to a progressive dilatation of esophagus with a remarkable thinning muscle layer. Of note, the mutant esophagus showed a decreased contractile responsiveness to potassium chloride and acetylcholine stimulation. Furthermore, an increase in the inhibitory neurites along with an intense infiltration of T lymphocytes in the mucosa and muscle layer were observed. Consistently, Hgs deficiency in SMCs resulted in a disturbed expression of a set of genes involved in neurotrophin and inflammation, suggesting that defective SMC might be a novel source for excessive production of cytokines and chemokines which may trigger the neuronal dysplasia and ultimately contribute to the compromised esophageal motility. The data suggest potential implications in the pathogenesis of related diseases such as gastroesophageal reflux disease.
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Affiliation(s)
- Jicheng Chen
- 1. Model Organism Division, E-institutes of Shanghai Universities, Shanghai Jiaotong University, Shanghai 200025, China ; 2. State Key Laboratory of Proteomics, Collaborative Innovation Center for Cardiovascular Disorders, Genetic Laboratory of Development and Disease, Institute of Biotechnology, Beijing 100071, China
| | - Ning Hou
- 2. State Key Laboratory of Proteomics, Collaborative Innovation Center for Cardiovascular Disorders, Genetic Laboratory of Development and Disease, Institute of Biotechnology, Beijing 100071, China
| | - Chong Zhang
- 1. Model Organism Division, E-institutes of Shanghai Universities, Shanghai Jiaotong University, Shanghai 200025, China ; 2. State Key Laboratory of Proteomics, Collaborative Innovation Center for Cardiovascular Disorders, Genetic Laboratory of Development and Disease, Institute of Biotechnology, Beijing 100071, China
| | - Yan Teng
- 2. State Key Laboratory of Proteomics, Collaborative Innovation Center for Cardiovascular Disorders, Genetic Laboratory of Development and Disease, Institute of Biotechnology, Beijing 100071, China
| | - Xuan Cheng
- 2. State Key Laboratory of Proteomics, Collaborative Innovation Center for Cardiovascular Disorders, Genetic Laboratory of Development and Disease, Institute of Biotechnology, Beijing 100071, China
| | - Zhenhua Li
- 2. State Key Laboratory of Proteomics, Collaborative Innovation Center for Cardiovascular Disorders, Genetic Laboratory of Development and Disease, Institute of Biotechnology, Beijing 100071, China
| | - Jie Ren
- 3. Department of Cardiovascular Electrophysiology Research, College of Basic Medicine, Capital Medical University, Beijing 100069, China
| | - Jian Zeng
- 2. State Key Laboratory of Proteomics, Collaborative Innovation Center for Cardiovascular Disorders, Genetic Laboratory of Development and Disease, Institute of Biotechnology, Beijing 100071, China
| | - Rui Li
- 2. State Key Laboratory of Proteomics, Collaborative Innovation Center for Cardiovascular Disorders, Genetic Laboratory of Development and Disease, Institute of Biotechnology, Beijing 100071, China
| | - Wei Wang
- 3. Department of Cardiovascular Electrophysiology Research, College of Basic Medicine, Capital Medical University, Beijing 100069, China
| | - Xiao Yang
- 1. Model Organism Division, E-institutes of Shanghai Universities, Shanghai Jiaotong University, Shanghai 200025, China ; 2. State Key Laboratory of Proteomics, Collaborative Innovation Center for Cardiovascular Disorders, Genetic Laboratory of Development and Disease, Institute of Biotechnology, Beijing 100071, China
| | - Yu Lan
- 2. State Key Laboratory of Proteomics, Collaborative Innovation Center for Cardiovascular Disorders, Genetic Laboratory of Development and Disease, Institute of Biotechnology, Beijing 100071, China
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12
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Xiao Z, Peng J, Yang L, Kong H, Yin F. Interleukin-1β plays a role in the pathogenesis of mesial temporal lobe epilepsy through the PI3K/Akt/mTOR signaling pathway in hippocampal neurons. J Neuroimmunol 2015; 282:110-7. [DOI: 10.1016/j.jneuroim.2015.04.003] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Revised: 03/27/2015] [Accepted: 04/01/2015] [Indexed: 12/11/2022]
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13
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Wilcox KS, Vezzani A. Does brain inflammation mediate pathological outcomes in epilepsy? ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2014; 813:169-83. [PMID: 25012376 DOI: 10.1007/978-94-017-8914-1_14] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Inflammation in the central nervous system (CNS) is associated with epilepsy and is characterized by the increased levels of a complex set of soluble molecules and their receptors in epileptogenic foci with profound neuromodulatory effects. These molecules activate receptor-mediated pathways in glia and neurons that contribute to hyperexcitability in neural networks that underlie seizure generation. As a consequence, exciting new opportunities now exist for novel therapies targeting the various components of the immune system and the associated inflammatory mediators, especially the IL-1β system. This review summarizes recent findings that increased our understanding of the role of inflammation in reducing seizure threshold, contributing to seizure generation, and participating in epileptogenesis. We will discuss preclinical studies supporting the hypothesis that pharmacological inhibition of specific proinflammatory signalings may be useful to treat drug-resistant seizures in human epilepsy, and possibly delay or arrest epileptogenesis.
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Affiliation(s)
- Karen S Wilcox
- Department of Pharmacology and Toxicology, University of Utah, Salt Lake City, UT, 84108, USA,
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14
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Vezzani A, Viviani B. Neuromodulatory properties of inflammatory cytokines and their impact on neuronal excitability. Neuropharmacology 2014; 96:70-82. [PMID: 25445483 DOI: 10.1016/j.neuropharm.2014.10.027] [Citation(s) in RCA: 400] [Impact Index Per Article: 40.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Revised: 10/24/2014] [Accepted: 10/29/2014] [Indexed: 01/01/2023]
Abstract
Increasing evidence underlines that prototypical inflammatory cytokines (IL-1β, TNF-α and IL-6) either synthesized in the central (CNS) or peripheral nervous system (PNS) by resident cells, or imported by immune blood cells, are involved in several pathophysiological functions, including an unexpected impact on synaptic transmission and neuronal excitability. This review describes these unconventional neuromodulatory properties of cytokines, that are distinct from their classical action as effector molecules of the immune system. In addition to the role of cytokines in brain physiology, we report evidence that dysregulation of their biosynthesis and cellular release, or alterations in receptor-mediated intracellular pathways in target cells, leads to neuronal cell dysfunction and modifications in neuronal network excitability. As a consequence, targeting of these cytokines, and related signalling molecules, is considered a novel option for the development of therapies in various CNS or PNS disorders associated with an inflammatory component. This article is part of a Special Issue entitled 'Neuroimmunology and Synaptic Function'.
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Affiliation(s)
- Annamaria Vezzani
- IRCCS-Istituto di Ricerche Farmacologiche "Mario Negri", Department of Neuroscience, Milano, Italy.
| | - Barbara Viviani
- Department of Pharmacological and Biomolecular Sciences, University of Milan, Milano, Italy.
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15
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Mesentier-Louro LA, Zaverucha-do-Valle C, da Silva-Junior AJ, Nascimento-dos-Santos G, Gubert F, de Figueirêdo ABP, Torres AL, Paredes BD, Teixeira C, Tovar-Moll F, Mendez-Otero R, Santiago MF. Distribution of mesenchymal stem cells and effects on neuronal survival and axon regeneration after optic nerve crush and cell therapy. PLoS One 2014; 9:e110722. [PMID: 25347773 PMCID: PMC4210195 DOI: 10.1371/journal.pone.0110722] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Accepted: 09/24/2014] [Indexed: 02/07/2023] Open
Abstract
Bone marrow-derived cells have been used in different animal models of neurological diseases. We investigated the therapeutic potential of mesenchymal stem cells (MSC) injected into the vitreous body in a model of optic nerve injury. Adult (3–5 months old) Lister Hooded rats underwent unilateral optic nerve crush followed by injection of MSC or the vehicle into the vitreous body. Before they were injected, MSC were labeled with a fluorescent dye or with superparamagnetic iron oxide nanoparticles, which allowed us to track the cells in vivo by magnetic resonance imaging. Sixteen and 28 days after injury, the survival of retinal ganglion cells was evaluated by assessing the number of Tuj1- or Brn3a-positive cells in flat-mounted retinas, and optic nerve regeneration was investigated after anterograde labeling of the optic axons with cholera toxin B conjugated to Alexa 488. Transplanted MSC remained in the vitreous body and were found in the eye for several weeks. Cell therapy significantly increased the number of Tuj1- and Brn3a-positive cells in the retina and the number of axons distal to the crush site at 16 and 28 days after optic nerve crush, although the RGC number decreased over time. MSC therapy was associated with an increase in the FGF-2 expression in the retinal ganglion cells layer, suggesting a beneficial outcome mediated by trophic factors. Interleukin-1β expression was also increased by MSC transplantation. In summary, MSC protected RGC and stimulated axon regeneration after optic nerve crush. The long period when the transplanted cells remained in the eye may account for the effect observed. However, further studies are needed to overcome eventually undesirable consequences of MSC transplantation and to potentiate the beneficial ones in order to sustain the neuroprotective effect overtime.
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Affiliation(s)
- Louise Alessandra Mesentier-Louro
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, INBEB, Rio de Janeiro, Brazil
| | - Camila Zaverucha-do-Valle
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, INBEB, Rio de Janeiro, Brazil
| | - Almir Jordão da Silva-Junior
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, INBEB, Rio de Janeiro, Brazil
| | - Gabriel Nascimento-dos-Santos
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, INBEB, Rio de Janeiro, Brazil
| | - Fernanda Gubert
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, INBEB, Rio de Janeiro, Brazil
| | - Ana Beatriz Padilha de Figueirêdo
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, INBEB, Rio de Janeiro, Brazil
| | - Ana Luiza Torres
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, INBEB, Rio de Janeiro, Brazil
| | - Bruno D. Paredes
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, INBEB, Rio de Janeiro, Brazil
| | - Camila Teixeira
- National Center of Structural Biology and Bioimaging (CENABIO), Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Fernanda Tovar-Moll
- National Center of Structural Biology and Bioimaging (CENABIO), Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- D'Or Institute for Research and Education (IDOR), Rio de Janeiro, Brazil
- Institute of Biomedical Sciences (ICB), Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Rosalia Mendez-Otero
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, INBEB, Rio de Janeiro, Brazil
| | - Marcelo F. Santiago
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
- Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, INBEB, Rio de Janeiro, Brazil
- * E-mail:
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16
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Lim SH, Park E, You B, Jung Y, Park AR, Park SG, Lee JR. Neuronal synapse formation induced by microglia and interleukin 10. PLoS One 2013; 8:e81218. [PMID: 24278397 PMCID: PMC3838367 DOI: 10.1371/journal.pone.0081218] [Citation(s) in RCA: 146] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Accepted: 10/10/2013] [Indexed: 11/18/2022] Open
Abstract
Recently, it was found that microglia regulated synaptic remodeling of the developing brain, but their mechanisms have not been well understood. In this study, the action of microglia on neuronal synapse formation was investigated, and the primary target of microglial processes was discovered. When the developing microglia were applied to cultured hippocampal neurons without direct contact, the numbers of dendritic spines and excitatory and inhibitory synapses significantly increased. In order to find out the main factor for synaptic formation, the effects of cytokines released from microglia were examined. When recombinant proteins of cytokines were applied to neuronal culture media, interleukin 10 increased the numbers of dendritic spines in addition to excitatory and inhibitory synapses. Interestingly, without external stimuli, the amount of interleukin 10 released from the intact microglia appeared to be sufficient for the induction of synaptic formation. The neutralizing antibodies of interleukin 10 receptors attenuated the induction of the synaptic formation by microglia. The expression of interleukin 10 receptor was newly found in the hippocampal neurons of early developmental stage. When interleukin 10 receptors on the hippocampal neurons were knocked down with specific shRNA, the induction of synaptic formation by microglia and interleukin 10 disappeared. Pretreatment with lipopolysaccharide inhibited microglia from inducing synaptic formation, and interleukin 1β antagonized the induction of synaptic formation by interleukin 10. In conclusion, the developing microglia regulated synaptic functions and neuronal development through the interactions of the interleukin 10 released from the microglia with interleukin 10 receptors expressed on the hippocampal neurons.
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Affiliation(s)
- So-Hee Lim
- Biomedical Proteomics Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea
| | - Eunha Park
- Biomedical Proteomics Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea
| | - Boram You
- Biomedical Proteomics Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea
| | - Youngseob Jung
- Biomedical Proteomics Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea
| | - A-Reum Park
- Biomedical Proteomics Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea
| | - Sung Goo Park
- Biomedical Proteomics Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea
| | - Jae-Ran Lee
- Biomedical Proteomics Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea
- * E-mail:
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17
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Dooley D, Vidal P, Hendrix S. Immunopharmacological intervention for successful neural stem cell therapy: New perspectives in CNS neurogenesis and repair. Pharmacol Ther 2013; 141:21-31. [PMID: 23954656 DOI: 10.1016/j.pharmthera.2013.08.001] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Accepted: 07/26/2013] [Indexed: 12/11/2022]
Abstract
The pharmacological support and stimulation of endogenous and transplanted neural stem cells (NSCs) is a major challenge in brain repair. Trauma to the central nervous system (CNS) results in a distinct inflammatory response caused by local and infiltrating immune cells. This makes NSC-supported regeneration difficult due to the presence of inhibitory immune factors which are upregulated around the lesion site. The continual and dual role of the neuroinflammatory response leaves it difficult to decipher upon a single modulatory strategy. Therefore, understanding the influence of cytokines upon regulation of NSC self-renewal, proliferation and differentiation is crucial when designing therapies for CNS repair. There is a plethora of partially conflicting data in vitro and in vivo on the role of cytokines in modulating the stem cell niche and the milieu around NSC transplants. This is mainly due to the pleiotropic role of many factors. In order for cell-based therapy to thrive, treatment must be phase-specific to the injury and also be personalized for each patient, i.e. taking age, sex, neuroimmune and endocrine status as well as other key parameters into consideration. In this review, we will summarize the most relevant information concerning interleukin (IL)-1, IL-4, IL-10, IL-15, IFN-γ, the neuropoietic cytokine family and TNF-α in order to extract promising therapeutic approaches for further research. We will focus on the consequences of neuroinflammation on endogenous brain stem cells and the transplantation environment, the effects of the above cytokines on NSCs, as well as immunopharmacological manipulation of the microenvironment for potential therapeutic use.
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Affiliation(s)
- Dearbhaile Dooley
- Dep. of Morphology & Biomedical Research Institute, Hasselt University, Belgium
| | - Pia Vidal
- Dep. of Morphology & Biomedical Research Institute, Hasselt University, Belgium
| | - Sven Hendrix
- Dep. of Morphology & Biomedical Research Institute, Hasselt University, Belgium.
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18
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Abstract
Intestinal inflammation causes initial axonal degeneration and neuronal death but subsequent axon outgrowth from surviving neurons restores innervation density to the target smooth muscle cells. Elsewhere, the pro-inflammatory cytokines TNFα and IL-1β cause neurotoxicity, leading us to test their role in promoting enteric neuron death. In a rat coculture model, TNFα or IL-1β did not affect neuron number but did promote significant neurite outgrowth to twofold that of control by 48 h, while other cytokines (e.g., IL-4, TGFβ) were without effect. TNFα or IL-1β activated the NFκB signaling pathway, and inhibition of NFκB signaling blocked the stimulation of neurite growth. However, nuclear translocation of NFκB in smooth muscle cells but not in adjacent neurons suggested a dominant role for smooth muscle cells. TNFα or IL-1β sharply increased both mRNA and protein for GDNF, while the neurotrophic effects of TNFα or IL-1β were blocked by the RET-receptor blocker vandetanib. Conditioned medium from cytokine-treated smooth muscle cells mimicked the neurotrophic effect, inferring that TNFα and IL-1β promote neurite growth through NFκB-dependent induction of glial cell line-derived neurotrophic factor (GDNF) expression in intestinal smooth muscle cells. In vivo, TNBS-colitis caused early nuclear translocation of NFκB in smooth muscle cells. Conditioned medium from the intact smooth muscle of the inflamed colon caused a 2.5-fold increase in neurite number in cocultures, while Western blotting showed a substantial increase in GDNF protein. Pro-inflammatory cytokines promote neurite growth through upregulation of GDNF, a novel process that may facilitate re-innervation of smooth muscle cells and a return to homeostasis following initial damage.
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Kato N, Matsumoto M, Kogawa M, Atkins GJ, Findlay DM, Fujikawa T, Oda H, Ogata M. Critical role of p38 MAPK for regeneration of the sciatic nerve following crush injury in vivo. J Neuroinflammation 2013. [PMID: 23282009 DOI: 10.1186/1742–2094-10-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND The physiological function of p38α, which is an isoform of p38 MAPK, has been investigated previously in several studies using pharmacological inhibitors. However, the results regarding whether p38α promotes or inhibits nerve regeneration in vivo have been controversial. METHODS We generated novel p38α mutant mice (sem mice) with a point mutation in the region encoding the p38α substrate-docking-site, which serves as a limited loss-of-function model of p38α. In the present study, we utilized sem mice and wild-type littermates (wt mice) to investigate the physiological role of p38α in nerve regeneration following crush injuries. RESULTS At four weeks after crush injury, the average axon diameter and the average axon area in sem mice were significantly smaller than those in wt mice. The average myelin sheath thickness in sem mice was reduced compared to wt mice, but no significant difference was observed in the G-ratio between the two groups. The sciatic functional index value demonstrated that functional nerve recovery in sem mice following crush injury was delayed, which is consistent with the histological findings. To investigate the underlying mechanisms of these findings, we examined inflammatory responses of the sciatic nerve by immunohistochemistry and western blotting. At an early phase following crush injury, sem mice showed remarkably lower expression of inflammatory cytokines, such as TNF-α and IL-1β, than wt mice. The expression of Caspase-3 and Tenascin-C were also lower in sem mice. Conversely, at a late phase of the response, sem mice showed considerably higher expression of TNF-α and of IL-1β with lower expression of S-100 than wt mice. CONCLUSIONS This is the first study of the physiological role of p38 MAPK in nerve regeneration that does not rely on the use of pharmacological inhibitors. Our results indicate that p38α insufficiency may cause an inflammatory disorder, resulting in a delay of histological and functional nerve recovery following crush injury. We conclude that p38 MAPK has an important physiological role in nerve regeneration and may be important for controlling both initiation of inflammation and recovery from nerve injury.
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Affiliation(s)
- Naoki Kato
- Department of Orthopaedic Surgery, Saitama Medical University, Saitama, Japan.
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20
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Kato N, Matsumoto M, Kogawa M, Atkins GJ, Findlay DM, Fujikawa T, Oda H, Ogata M. Critical role of p38 MAPK for regeneration of the sciatic nerve following crush injury in vivo. J Neuroinflammation 2013; 10:1. [PMID: 23282009 PMCID: PMC3541116 DOI: 10.1186/1742-2094-10-1] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2012] [Accepted: 12/10/2012] [Indexed: 01/29/2023] Open
Abstract
Background The physiological function of p38α, which is an isoform of p38 MAPK, has been investigated previously in several studies using pharmacological inhibitors. However, the results regarding whether p38α promotes or inhibits nerve regeneration in vivo have been controversial. Methods We generated novel p38α mutant mice (sem mice) with a point mutation in the region encoding the p38α substrate-docking-site, which serves as a limited loss-of-function model of p38α. In the present study, we utilized sem mice and wild-type littermates (wt mice) to investigate the physiological role of p38α in nerve regeneration following crush injuries. Results At four weeks after crush injury, the average axon diameter and the average axon area in sem mice were significantly smaller than those in wt mice. The average myelin sheath thickness in sem mice was reduced compared to wt mice, but no significant difference was observed in the G-ratio between the two groups. The sciatic functional index value demonstrated that functional nerve recovery in sem mice following crush injury was delayed, which is consistent with the histological findings. To investigate the underlying mechanisms of these findings, we examined inflammatory responses of the sciatic nerve by immunohistochemistry and western blotting. At an early phase following crush injury, sem mice showed remarkably lower expression of inflammatory cytokines, such as TNF-α and IL-1β, than wt mice. The expression of Caspase-3 and Tenascin-C were also lower in sem mice. Conversely, at a late phase of the response, sem mice showed considerably higher expression of TNF-α and of IL-1β with lower expression of S-100 than wt mice. Conclusions This is the first study of the physiological role of p38 MAPK in nerve regeneration that does not rely on the use of pharmacological inhibitors. Our results indicate that p38α insufficiency may cause an inflammatory disorder, resulting in a delay of histological and functional nerve recovery following crush injury. We conclude that p38 MAPK has an important physiological role in nerve regeneration and may be important for controlling both initiation of inflammation and recovery from nerve injury.
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Affiliation(s)
- Naoki Kato
- Department of Orthopaedic Surgery, Saitama Medical University, Saitama, Japan.
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Santos ARC, Corredor RG, Obeso BA, Trakhtenberg EF, Wang Y, Ponmattam J, Dvoriantchikova G, Ivanov D, Shestopalov VI, Goldberg JL, Fini ME, Bajenaru ML. β1 integrin-focal adhesion kinase (FAK) signaling modulates retinal ganglion cell (RGC) survival. PLoS One 2012; 7:e48332. [PMID: 23118988 PMCID: PMC3485184 DOI: 10.1371/journal.pone.0048332] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2012] [Accepted: 09/24/2012] [Indexed: 12/16/2022] Open
Abstract
Extracellular matrix (ECM) integrity in the central nervous system (CNS) is essential for neuronal homeostasis. Signals from the ECM are transmitted to neurons through integrins, a family of cell surface receptors that mediate cell attachment to ECM. We have previously established a causal link between the activation of the matrix metalloproteinase-9 (MMP-9), degradation of laminin in the ECM of retinal ganglion cells (RGCs), and RGC death in a mouse model of retinal ischemia-reperfusion injury (RIRI). Here we investigated the role of laminin-integrin signaling in RGC survival in vitro, and after ischemia in vivo. In purified primary rat RGCs, stimulation of the β1 integrin receptor with laminin, or agonist antibodies enhanced RGC survival in correlation with activation of β1 integrin’s major downstream regulator, focal adhesion kinase (FAK). Furthermore, β1 integrin binding and FAK activation were required for RGCs’ survival response to laminin. Finally, in vivo after RIRI, we observed an up-regulation of MMP-9, proteolytic degradation of laminin, decreased RGC expression of β1 integrin, FAK and Akt dephosphorylation, and reduced expression of the pro-survival molecule bcl-xL in the period preceding RGC apoptosis. RGC death was prevented, in the context of laminin degradation, by maintaining β1 integrin activation with agonist antibodies. Thus, disruption of homeostatic RGC-laminin interaction and signaling leads to cell death after retinal ischemia, and maintaining integrin activation may be a therapeutic approach to neuroprotection.
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Affiliation(s)
- Andrea Rachelle C. Santos
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida, United States of America
| | - Raul G. Corredor
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida, United States of America
| | - Betty Albo Obeso
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida, United States of America
| | - Ephraim F. Trakhtenberg
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida, United States of America
- Neuroscience Program, Interdisciplinary Stem Cell Institute, University of Miami Miller School of Medicine, Miami, Florida, United States of America
| | - Ying Wang
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida, United States of America
| | - Jamie Ponmattam
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida, United States of America
| | - Galina Dvoriantchikova
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida, United States of America
| | - Dmitry Ivanov
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida, United States of America
| | - Valery I. Shestopalov
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida, United States of America
| | - Jeffrey L. Goldberg
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida, United States of America
- Neuroscience Program, Interdisciplinary Stem Cell Institute, University of Miami Miller School of Medicine, Miami, Florida, United States of America
| | - Mary Elizabeth Fini
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida, United States of America
- Institute for Genetic Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California, United States of America
| | - Michaela Livia Bajenaru
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida, United States of America
- * E-mail:
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Zelinka CP, Scott MA, Volkov L, Fischer AJ. The reactivity, distribution and abundance of Non-astrocytic Inner Retinal Glial (NIRG) cells are regulated by microglia, acute damage, and IGF1. PLoS One 2012; 7:e44477. [PMID: 22973454 PMCID: PMC3433418 DOI: 10.1371/journal.pone.0044477] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2012] [Accepted: 08/07/2012] [Indexed: 12/05/2022] Open
Abstract
Recent studies have described a novel type of glial cell that is scattered across the inner layers of the avian retina and possibly the retinas of primates. These cells have been termed Non-astrocytic Inner Retinal Glial (NIRG) cells. These cells are stimulated by insulin-like growth factor 1 (IGF1) to proliferate, migrate distally into the retina, and become reactive. These changes in glial activity correlate with increased susceptibility of retinal neurons and Müller glia to excitotoxic damage. The purpose of this study was to further study the NIRG cells in retinas treated with IGF1 or acute damage. In response to IGF1, the reactivity, proliferation and migration of NIRG cells persists through 3 days after treatment. At 7 days after treatment, the numbers and distribution of NIRG cells returns to normal, suggesting that homeostatic mechanisms are in place within the retina to maintain the numbers and distribution of these glial cells. By comparison, IGF1-induced microglial reactivity persists for at least 7 days after treatment. In damaged retinas, we find a transient accumulation of NIRG cells, which parallels the accumulation of reactive microglia, suggesting that the reactivity of NIRG cells and microglia are linked. When the microglia are selectively ablated by the combination of interleukin 6 and clodronate-liposomes, the NIRG cells down-regulate transitin and perish within the following week, suggesting that the survival and phenotype of NIRG cells are somehow linked to the microglia. We conclude that the abundance, reactivity and retinal distribution of NIRG cells can be dynamic, are regulated by homoestatic mechanisms and are tethered to the microglia.
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Affiliation(s)
- Christopher P. Zelinka
- Department of Neuroscience, College of Medicine, The Ohio State University, Columbus, Ohio, United States of America
| | - Melissa A. Scott
- Department of Neuroscience, College of Medicine, The Ohio State University, Columbus, Ohio, United States of America
| | - Leo Volkov
- Department of Neuroscience, College of Medicine, The Ohio State University, Columbus, Ohio, United States of America
| | - Andy J. Fischer
- Department of Neuroscience, College of Medicine, The Ohio State University, Columbus, Ohio, United States of America
- * E-mail:
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Interleukin-1R3 mediates interleukin-1-induced potassium current increase through fast activation of Akt kinase. Proc Natl Acad Sci U S A 2012; 109:12189-94. [PMID: 22778412 DOI: 10.1073/pnas.1205207109] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Inflammatory cytokine interleukin-1 (IL-1) performs multiple functions in the central nervous system. The type 1 IL-1 receptor (IL-1R1) and the IL-1 receptor accessory protein (IL-1RAcP) form a functional IL-1 receptor complex that is thought to mediate most, if not all, IL-1-induced effects. Several recent studies, however, suggest the existence of a heretofore-unidentified receptor for IL-1. In this study, we report that the IL-1R1 gene contains an internal promoter that drives the transcription of a shortened IL-1R1 mRNA. This mRNA is the template for a unique IL-1R protein that is identical to IL-1R1 at the C terminus, but with a shorter extracellular domain at the N terminus. We have termed this molecule IL-1R3. The mRNA and protein for IL-1R3 are expressed in normal and two strains of commercially available IL-1R1 knockout mice. Western blot analysis shows IL-1R3 is preferentially expressed in neural tissues. Furthermore, IL-1β binds specifically to IL-1R3 when it is complexed with the newly discovered alternative IL-1 receptor accessory protein, IL-1RAcPb. Stimulation of neurons expressing both IL-1R3 and IL-1RAcPb with IL-1β causes fast activation of the Akt kinase, which leads to an increase in voltage-gated potassium current. These results demonstrate that IL-1R3/IL-1RAcPb complex mediates a unique subset of IL-1 activity that accounts for many previously unexplained IL-1 effects in the central nervous system.
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Boato F, Hechler D, Rosenberger K, Lüdecke D, Peters EM, Nitsch R, Hendrix S. Interleukin-1 beta and neurotrophin-3 synergistically promote neurite growth in vitro. J Neuroinflammation 2011; 8:183. [PMID: 22200088 PMCID: PMC3275552 DOI: 10.1186/1742-2094-8-183] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2011] [Accepted: 12/26/2011] [Indexed: 01/19/2023] Open
Abstract
Pro-inflammatory cytokines such as interleukin-1 beta (IL-1β) are considered to exert detrimental effects during brain trauma and in neurodegenerative disorders. Consistently, it has been demonstrated that IL-1β suppresses neurotrophin-mediated neuronal cell survival rendering neurons vulnerable to degeneration. Since neurotrophins are also well known to strongly influence axonal plasticity, we investigated here whether IL-1β has a similar negative impact on neurite growth. We analyzed neurite density and length of organotypic brain and spinal cord slice cultures under the influence of the neurotrophins NGF, BDNF, NT-3 and NT-4. In brain slices, only NT-3 significantly promoted neurite density and length. Surprisingly, a similar increase of neurite growth was induced by IL-1β. Additionally, both factors increased the number of brain slices displaying maximal neurite growth. Furthermore, the co-administration of IL-1β and NT-3 significantly increased the number of brain slices displaying maximal neurite growth compared to single treatments. These data indicate that these two factors synergistically stimulate two distinct aspects of neurite outgrowth, namely neurite density and neurite length from acute organotypic brain slices.
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Affiliation(s)
- Francesco Boato
- Dept. of Functional Morphology & BIOMED Institute, Hasselt University, Belgium
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25
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Stemkowski PL, Smith PA. Long-term IL-1β exposure causes subpopulation-dependent alterations in rat dorsal root ganglion neuron excitability. J Neurophysiol 2011; 107:1586-97. [PMID: 22170966 DOI: 10.1152/jn.00587.2011] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
The effect of interleukin-1β (IL-1β) on the electrical properties of sensory neurons was assessed at levels and exposure times comparable to those found in animal models of neuropathic pain. Experiments involved whole cell current-clamp recordings from rat dorsal root ganglion (DRG) neurons in defined-medium, neuron-enriched cultures. Five- to six-day exposure to 100 pM IL-1β produced subpopulation-dependent effects on DRG neurons. These included an increase in the excitability of medium-diameter and small-diameter isolectin B(4) (IB(4))-positive neurons that was comparable to that found after peripheral nerve injury. By contrast, a reduction in excitability was observed in large-diameter neurons, while no effect was found in small-diameter IB(4)-negative neurons. Further characterization of changes in medium and small IB(4)-positive neurons revealed that some, but not all, effects of IL-1β were mediated through its receptor, IL-1RI. Although the acute actions of IL-1β on sensory neurons have been well studied and related to acute and/or inflammatory pain, the present study shows how sensory neurons respond to long-term cytokine exposure. Such effects are relevant to understanding processes that contribute to the onset of neuropathic pain.
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Denes A, Pinteaux E, Rothwell NJ, Allan SM. Interleukin-1 and stroke: biomarker, harbinger of damage, and therapeutic target. Cerebrovasc Dis 2011; 32:517-27. [PMID: 22104408 DOI: 10.1159/000332205] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2011] [Accepted: 08/26/2011] [Indexed: 12/15/2022] Open
Abstract
Inflammation is established as a contributor to cerebrovascular disease. Risk factors for stroke include many conditions associated with chronic or acute inflammation, and inflammatory changes in the brain after cerebrovascular events contribute to outcome in experimental studies, with growing evidence from clinical research. The brain is extremely susceptible to inflammatory challenge, but resident glia, endothelial cells and neurones can all mount a pronounced inflammatory response to infection or injury. Recent discoveries highlight the importance of peripherally-derived immune cells and inflammatory molecules in various central nervous system disorders, including stroke. The inflammatory cytokine, interleukin-1 (IL-1), plays a pivotal role in both local and systemic inflammation, and is a key driver of peripheral and central immune responses to infection or injury. Inhibition of IL-1 has beneficial effects in a variety of experimental paradigms of acute brain injury and is a promising clinical target in stroke. We propose that blockade of IL-1 could be therapeutically useful in several diseases which are risk factors for stroke, and there is already considerable pre-clinical and clinical evidence that inhibition of IL-1 by IL-1 receptor antagonist may be valuable in the management of acute stroke.
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Affiliation(s)
- Adam Denes
- Faculty of Life Sciences, University of Manchester, Manchester, UK.
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27
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Vezzani A, Maroso M, Balosso S, Sanchez MA, Bartfai T. IL-1 receptor/Toll-like receptor signaling in infection, inflammation, stress and neurodegeneration couples hyperexcitability and seizures. Brain Behav Immun 2011; 25:1281-9. [PMID: 21473909 DOI: 10.1016/j.bbi.2011.03.018] [Citation(s) in RCA: 280] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2011] [Revised: 03/29/2011] [Accepted: 03/30/2011] [Indexed: 01/07/2023] Open
Abstract
Increasing evidence supports the involvement of immune and inflammatory processes in the etiopathogenesis of seizures. In particular, activation of innate immune mechanisms and the subsequent inflammatory responses, that are induced in the brain by infection, febrile seizures, neurotrauma, stroke are well documented conditions associated with acute symptomatic seizures and with a high risk of developing epilepsy. A decade ago, pharmacological experiments showed that elevated brain levels of the anti-inflammatory molecule IL-1 receptor antagonist reduced seizures in epilepsy models. This observation, together with the evidence of in situ induction of inflammatory mediators and their receptors in experimental and human epileptogenic brain tissue, established the proof-of-concept evidence that the activation of innate immunity and inflammation in the brain are intrinsic features of the pathologic hyperexcitable tissue. Recent breakthroughs in understanding the molecular organization of the innate immune system first in macrophages, then in the different cell types of the CNS, together with pharmacological and genetic studies in epilepsy models, showed that the activation of IL-1 receptor/Toll-like receptor (IL-1R/TLR) signaling significantly contributes to seizures. IL-1R/TLR mediated pro-excitatory actions are elicited in the brain either by mimicking bacterial or viral infections and inflammatory responses, or via the action of endogenous ligands. These ligands include proinflammatory cytokines, such as IL-1beta, or danger signals, such as HMGB1, released from activated or injured cells. The IL-1R/TLR signaling mediates rapid post-translational changes in voltage- and ligand-gated ion channels that increase excitability, and transcriptional changes in genes involved in neurotransmission and synaptic plasticity that contribute to lower seizure thresholds chronically. The anticonvulsant effects of inhibitors of the IL-1R/TLR signaling in various seizures models suggest that this system could be targeted to inhibit seizures in presently pharmaco-resistant epilepsies.
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Affiliation(s)
- Annamaria Vezzani
- Department of Neuroscience, Mario Negri Institute for Pharmacological Research, Via G. La Masa 19, 20156 Milano, Italy.
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Interleukin-1β Inhibits Voltage-Gated Sodium Currents in a Time- and Dose-Dependent Manner in Cortical Neurons. Neurochem Res 2011; 36:1116-23. [DOI: 10.1007/s11064-011-0456-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/18/2011] [Indexed: 01/21/2023]
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Koeberle PD, Schlichter LC. Targeting K(V) channels rescues retinal ganglion cells in vivo directly and by reducing inflammation. Channels (Austin) 2010. [PMID: 20699649 DOI: 10.4161/chan.4.5.12790] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Retinal ganglion cell (RGC) degeneration is an important cause of visual impairment, and results in part from microglia-mediated inflammation. Numerous experimental studies have focused on identifying drug targets to rescue these neurons. We recently showed that K(V)1.1 and K(V)1.3 channels are expressed in adult rat RGCs and that siRNA-mediated knockdown of either channel reduces RGC death after optic nerve transection. Earlier we found that K(V)1.3 channels also contribute to microglial activation and neurotoxicity; raising the possibility that these channels contribute to neurodegeneration through direct roles in RGCs and through inflammatory mechanisms. Here, RGC survival was increased by combined siRNA-mediated knockdown of K(V)1.1 and K(V)1.3 in RGCs, but survival was much greater when knockdown of either channel was combined with intraocular injection of a K(V)1.3 channel blocker (agitoxin-2 or margatoxin). After axotomy, increased expression of several inflammation-related molecules preceded RGC loss and, consistent with a dual mechanism, their expression was differentially affected when channel knockdown in RGCs was combined with K(V)1.3 blocker injection. K(V)1.3 blockers reduced activation of retinal microglia and their tight apposition along RGC axon fascicles after axotomy, but did not prevent their migration from the inner plexiform to the damaged ganglion cell layer. Expression of several growth factors increased after axotomy; and again, there were differences following blocker injection compared with RGC-selective channel knockdown. These results provide evidence that K(V)1.3 channels play important roles in apoptotic degeneration of adult RGCs through cell-autonomous mechanisms mediated by channels in the neurons, and nonautonomous mechanisms mediated by microglia and inflammation.
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Sättler MB, Bähr M. Future neuroprotective strategies. Exp Neurol 2010; 225:40-7. [DOI: 10.1016/j.expneurol.2009.08.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2009] [Revised: 08/18/2009] [Accepted: 08/19/2009] [Indexed: 12/27/2022]
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Napoli I, Neumann H. Protective effects of microglia in multiple sclerosis. Exp Neurol 2010; 225:24-8. [DOI: 10.1016/j.expneurol.2009.04.024] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2009] [Accepted: 04/24/2009] [Indexed: 10/20/2022]
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Tabarean I, Morrison B, Marcondes MC, Bartfai T, Conti B. Hypothalamic and dietary control of temperature-mediated longevity. Ageing Res Rev 2010; 9:41-50. [PMID: 19631766 DOI: 10.1016/j.arr.2009.07.004] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2009] [Revised: 07/14/2009] [Accepted: 07/16/2009] [Indexed: 10/20/2022]
Abstract
Temperature is an important modulator of longevity and aging in both poikilotherms and homeotherm animals. In homeotherms, temperature homeostasis is regulated primarily in the preoptic area (POA) of the hypothalamus. This region receives and integrates peripheral, central and environmental signals and maintains a nearly constant core body temperature (T(core)) by regulating the autonomic and hormonal control of heat production and heat dissipation. Temperature sensitive neurons found in the POA are considered key elements of the neuronal circuitry modulating these effects. Nutrient homeostasis is also a hypothalamically regulated modulator of aging as well as one of the signals that can influence T(core) in homeotherms. Investigating the mechanisms of the regulation of nutrient and temperature homeostasis in the hypothalamus is important to understanding how these two elements of energy homeostasis influence longevity and aging as well as how aging can affect hypothalamic homeostatic mechanisms.
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Armanet M, Wojtusciszyn A, Morel P, Parnaud G, Rousselle P, Sinigaglia C, Berney T, Bosco D. Regulated laminin-332 expression in human islets of Langerhans. FASEB J 2009; 23:4046-55. [PMID: 19667121 DOI: 10.1096/fj.08-127142] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2023]
Abstract
Laminin-332 (LN-332) is a basement membrane component known to exert a beneficial effect on rat pancreatic beta cells in vitro. In this work, we analyzed the expression of LN-332 in human islets, its expression after inflammatory insults by cytokines, and the molecular mechanisms responsible for this effect. By Western blotting and RT-PCR, we showed that LN-332 was expressed in isolated human islets. By immunofluorescence on pancreas sections, we observed that labeling was confined to endocrine cells in islets. Confocal microscopy analysis on isolated islet cells revealed that labeling was granular but did not colocalize with hormone secretory granules. LN-332 was most abundant in cultured islets compared to freshly isolated islets and was found in culture medium, which suggests that it was secreted by islets. When islets were exposed to interleukin (IL)-1beta, expression and secretion of LN-332 increased as compared to control. No effect was observed with tumor necrosis factor (TNF)-alpha and interferon (IFN)-gamma. LY294002, an inhibitor of phosphatidylinositol 3-kinase (PI3-K) activity, inhibited culture- and IL-1beta-induced LN-332 expression in islets. These results show that LN-332, known to have some beneficial effect on beta cells in vitro, is produced and secreted by endocrine islet cells and is up-regulated by stressing conditions such as culture and IL-1beta-exposure.
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Affiliation(s)
- Mathieu Armanet
- Department of Surgery, Cell Isolation and Transplantation Center, Geneva University Hospitals and University of Geneva, 1211 Geneva-4, Switzerland
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Herseth JI, Refsnes M, Låg M, Schwarze PE. Role of IL-1β and COX2 in silica-induced IL-6 release and loss of pneumocytes in co-cultures. Toxicol In Vitro 2009; 23:1342-53. [DOI: 10.1016/j.tiv.2009.06.031] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2008] [Revised: 06/18/2009] [Accepted: 06/30/2009] [Indexed: 01/02/2023]
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Constandil L, Hernández A, Pelissier T, Arriagada O, Espinoza K, Burgos H, Laurido C. Effect of interleukin-1beta on spinal cord nociceptive transmission of normal and monoarthritic rats after disruption of glial function. Arthritis Res Ther 2009; 11:R105. [PMID: 19586548 PMCID: PMC2745785 DOI: 10.1186/ar2756] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2009] [Revised: 06/09/2009] [Accepted: 07/08/2009] [Indexed: 12/02/2022] Open
Abstract
Introduction Cytokines produced by spinal cord glia after peripheral injuries have a relevant role in the maintenance of pain states. Thus, while IL-1β is overexpressed in the spinal cords of animals submitted to experimental arthritis and other chronic pain models, intrathecal administration of IL-1β to healthy animals induces hyperalgesia and allodynia and enhances wind-up activity in dorsal horn neurons. Methods To investigate the functional contribution of glial cells in the spinal cord nociceptive transmission, the effect of intrathecally administered IL-1β was studied in both normal and adjuvant-induced arthritic rats with or without glial inhibition. Four weeks after induction of monoarthritis, rats were treated with the glial cell inhibitor propentofylline (10 μg i.t. daily during 10 days) and submitted to a C-fiber-mediated reflex paradigm evoked by single and repetitive (wind-up) electric stimulation. Results Both the propentofylline treatment and the monoarthritic condition modified the stimulating current required for threshold activation of C reflex responses. Intrathecal IL-1β increased spinal cord wind-up activity in normal and monoarthritic rats without propentofylline pre-treatment, but resulted in decreased wind-up activity in normal and monoarthritic propentofylline-treated animals. Intrathecal saline did not produce any effect. Thus, glial inactivation reverted into inhibition the excitatory effect of IL-1β on spinal cord wind-up, irrespective of the normal or monoarthritic condition of rats. Conclusions The results suggest that the excitatory effect of nanomolar doses of IL-1β on spinal wind-up in healthy rats is produced by an unidentified glial mediator, while the inhibitory effects of IL-1β on wind-up activity in animals with inactivated glia resulted from a direct effect of the cytokine on dorsal horn neurons. The present study failed to demonstrate a differential sensitivity of normal and monoarthritic rats to IL-1β administration into the spinal cord and to disruption of β glial function, as both normal and monoarthritic animals changes wind-up activity in the same direction after propentofylline treatment, suggesting that after glial inhibition normal and monoarthritic animals behave similarly relative to the capability of dorsal horn neurons to generate wind-up activity when repeatedly stimulated by C-fibers.
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Affiliation(s)
- Luis Constandil
- Laboratory of Neurobiology, Department of Biology, Faculty of Chemistry and Biology, University of Santiago of Chile, Ave. Libertador B. O'Higgins 3363, Casilla 40 Correo 33, Santiago, Chile.
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Arriagada O, Constandil L, Hernández A, Barra R, Soto-Moyano R, Laurido C. EFFECTS OF INTERLEUKIN-1β ON SPINAL CORD NOCICEPTIVE TRANSMISSION IN INTACT AND PROPENTOFYLLINE-TREATED RATS. Int J Neurosci 2009; 117:617-25. [PMID: 17464780 DOI: 10.1080/00207450600773806] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
To investigate the contribution of glial cells in the spinal cord nociceptive transmission, the effect of intrathecally administered interleukin-1beta (IL-1beta) was studied in rats treated with the glial cell inactivator propentofylline and submitted to a C-fiber-mediated reflex paradigm evoked by single and repetitive (wind-up) electric stimulation. Intrathecal IL-1beta did not modify the C reflex integrated activity in either group of animals, while producing increased wind-up in intact and decreased wind-up in propentofylline pre-treated rats. Results suggest that the excitatory effect of IL-1beta on spinal wind-up activity in healthy rats is produced by a glial mediator, whereas the inhibitory effect resulted from a direct effect of the cytokine on dorsal horn neurons.
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Affiliation(s)
- Osvaldo Arriagada
- Laboratory of Neurobiology, Department of Biology Faculty of Chemistry and Biology, University of Santiago of Chile, Santiago, Chile
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37
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Mode of action of cytokines on nociceptive neurons. Exp Brain Res 2009; 196:67-78. [PMID: 19290516 DOI: 10.1007/s00221-009-1755-z] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2008] [Accepted: 02/24/2009] [Indexed: 01/05/2023]
Abstract
Cytokines are pluripotent soluble proteins secreted by immune and glial cells and are key elements in the induction and maintenance of pain. They are categorized as pro-inflammatory cytokines, which are mostly algesic, and anti-inflammatory cytokines, which have analgesic properties. Progress has been made in understanding the mechanisms underlying the action of cytokines in pain. To date, several direct and indirect pathways are known that link cytokines with nociception or hyperalgesia. Cytokines may act via specific cytokine receptors inducing downstream signal transduction cascades, which then modulate the function of other receptors like the ionotropic glutamate receptor, the transient vanilloid receptors, or sodium channels. This receptor activation, either through amplification of the inflammatory reaction, or through direct modulation of ion channel currents, then results in pain sensation. Following up on results from animal experiments, cytokine profiles have recently been investigated in human pain states. An imbalance of pro- and anti-inflammatory cytokine expression may be of importance for individual pain susceptibility. Individual cytokine profiles may be of diagnostic importance in chronic pain states, and, in the future, might guide the choice of treatment.
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38
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Ellenberg D, Shi J, Jain S, Chang JH, Ripps H, Brady S, Melhem ER, Lakkis F, Adamis A, Chen DF, Ellis-Behnke R, Langer RS, Strittmatter SM, Azar DT. Impediments to eye transplantation: ocular viability following optic-nerve transection or enucleation. Br J Ophthalmol 2009; 93:1134-40. [PMID: 19286686 DOI: 10.1136/bjo.2008.155267] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Maintenance of ocular viability is one of the major impediments to successful whole-eye transplantation. This review provides a comprehensive understanding of the current literature to help guide future studies in order to overcome this hurdle. A systematic multistage review of published literature was performed. Three specific questions were addressed: (1) Is recovery of visual function following eye transplantation greater in cold-blooded vertebrates when compared with mammals? (2) Is outer retina function following enucleation and reperfusion improved compared with enucleation alone? (3) Following optic-nerve transection, is there a correlation between retinal ganglion cell (RGC) survival and either time after transection or proximity of the transection to the globe? In a majority of the studies performed in the literature, recovery of visual function can occur after whole-eye transplantation in cold-blooded vertebrates. Following enucleation (and reperfusion), outer retinal function is maintained from 4 to 9 h. RGC survival following optic-nerve transection is inversely related to both the time since transection and the proximity of transection to the globe. Lastly, neurotrophins can increase RGC survival following optic-nerve transection. This review of the literature suggests that the use of a donor eye is feasible for whole-eye transplantation.
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Affiliation(s)
- D Ellenberg
- Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago, Chicago, Illinois 60612, USA
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39
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Pinteaux E, Trotter P, Simi A. Cell-specific and concentration-dependent actions of interleukin-1 in acute brain inflammation. Cytokine 2008; 45:1-7. [PMID: 19026559 DOI: 10.1016/j.cyto.2008.10.008] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2008] [Revised: 09/15/2008] [Accepted: 10/10/2008] [Indexed: 01/03/2023]
Abstract
Interleukin (IL)-1 is a pivotal pro-inflammatory cytokine and an important mediator of both acute and chronic central nervous system (CNS) injuries. Despite intense research in CNS IL-1 biology over the past two decades, its precise mechanism of action in inflammatory responses to acute brain disorders remains largely unknown. In particular, much effort has been focussed on using in vitro approaches to better understand the cellular and signalling mechanisms of actions of IL-1, yet some discrepancies in the literature regarding the effects produced by IL-1beta in in vitro paradigms of injury still exist, particularly as to whether IL-1 exerts neurotoxic or neuroprotective effects. Here we aim to review the cell-specific and concentration-dependent actions of IL-1 in brain cells, to depict the mechanism by which this cytokine induces neurotoxicity or neuroprotection in acute brain injury.
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Affiliation(s)
- Emmanuel Pinteaux
- Faculty of Life Sciences, Michael Smith Building, University of Manchester, Oxford Road, Manchester M13 9PT, United Kingdom.
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40
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Takeda M, Kitagawa J, Takahashi M, Matsumoto S. Activation of interleukin-1beta receptor suppresses the voltage-gated potassium currents in the small-diameter trigeminal ganglion neurons following peripheral inflammation. Pain 2008; 139:594-602. [PMID: 18694623 DOI: 10.1016/j.pain.2008.06.015] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2008] [Revised: 05/13/2008] [Accepted: 06/09/2008] [Indexed: 01/17/2023]
Abstract
The glial cytokine, interleukin-1beta (IL-1beta), potentiates the excitability of nociceptive trigeminal ganglion (TRG) neurons via membrane depolarization following peripheral inflammation. Perforated patch-clamp technique was used this study to show that the mechanism underlying the excitability of small-diameter TRG neurons following inflammation is due to IL-1beta. Inflammation was induced by injection of complete Freund's adjuvant (CFA) into the whisker pad. The TRG neurons innervating the site of inflammation were identified by fluorogold (FG) labeling. The threshold for escape from mechanical stimulation applied to the orofacial area in inflamed rats was significantly lower than observed for control rats. IL-1beta at 1nM suppressed total voltage-gated K(+) currents in most TRG neurons (70%) under voltage-clamp conditions in control and inflamed rats. IL-1beta significantly decreased the total, transient (I(A)) and sustained (I(K)) currents in FG-labeled small-diameter TRG neurons in both groups. The IL-1beta-induced suppression of TRG neuron excitability was abolished by co-administration of ILra, an IL-1beta receptor blocker. The magnitude of inhibition of I(A) and I(K) currents by IL-1beta was significantly greater in inflamed rats than in controls. IL-1beta inhibited I(A) to a significantly greater extent than I(K). These results suggest that the inhibitory effect of I(A) and I(K) currents by IL-1beta in small-diameter TRG neurons potentiates neuronal excitability thereby contributing to trigeminal inflammatory hyperalgesia. These findings provide evidence for the development of voltage-gated K(+) channel openers and IL-1beta antagonists as therapeutic agents for the treatment of trigeminal inflammatory hyperalgesia.
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Affiliation(s)
- Mamoru Takeda
- Department of Physiology, School of Life Dentistry at Tokyo, Nippon Dental University, 1-9-20, Fujimi-cho, Chiyoda-ku, Tokyo 102-8159, Japan
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41
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Interleukin-1 beta promotes sensory nerve regeneration after sciatic nerve injury. Neurosci Lett 2008; 440:130-3. [DOI: 10.1016/j.neulet.2008.05.081] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2008] [Revised: 05/15/2008] [Accepted: 05/21/2008] [Indexed: 11/19/2022]
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42
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Fogal B, Hewett SJ. Interleukin-1beta: a bridge between inflammation and excitotoxicity? J Neurochem 2008; 106:1-23. [PMID: 18315560 DOI: 10.1111/j.1471-4159.2008.05315.x] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Interleukin-1 (IL-1) is a proinflammatory cytokine released by many cell types that acts in both an autocrine and/or paracrine fashion. While IL-1 is best described as an important mediator of the peripheral immune response during infection and inflammation, increasing evidence implicates IL-1 signaling in the pathogenesis of several neurological disorders. The biochemical pathway(s) by which this cytokine contributes to brain injury remain(s) largely unidentified. Herein, we review the evidence that demonstrates the contribution of IL-1beta to the pathogenesis of both acute and chronic neurological disorders. Further, we highlight data that leads us to propose IL-1beta as the missing mechanistic link between a potential beneficial inflammatory response and detrimental glutamate excitotoxicity.
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Affiliation(s)
- Birgit Fogal
- Department of Pediatrics, Yale University School of Medicine, New Haven, Connecticut, USA
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43
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Effect of cytokines on neuronal excitability. Neurosci Lett 2008; 437:188-93. [PMID: 18420346 DOI: 10.1016/j.neulet.2008.03.052] [Citation(s) in RCA: 166] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2007] [Revised: 02/28/2008] [Accepted: 03/19/2008] [Indexed: 01/11/2023]
Abstract
Numerous studies have shown that proinflammatory cytokines induce or facilitate pain and hyperalgesia in the presence of inflammation, injury to the nervous system or cancer. Besides acting as inflammatory mediators, increasing evidence indicates that cytokines may also specifically interact with receptor and ion channels regulating neuronal excitability, synaptic plasticity and injury under both physiological and pathological conditions. Here we summarize findings on two prototypical proinflammatory cytokines, tumor-necrosis factor-alpha and interleukin-1 beta, and their effects on neuronal excitability and ion channels with special regards to pain and hyperalgesia.
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44
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IL-1β promotes neurite outgrowth by deactivating RhoA via p38 MAPK pathway. Biochem Biophys Res Commun 2008; 365:375-80. [DOI: 10.1016/j.bbrc.2007.10.198] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2007] [Accepted: 10/31/2007] [Indexed: 11/20/2022]
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45
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Strain-specific susceptibility for neurodegeneration in a rat model of autoimmune optic neuritis. J Neuroimmunol 2008; 193:77-86. [DOI: 10.1016/j.jneuroim.2007.10.021] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2007] [Revised: 10/22/2007] [Accepted: 10/22/2007] [Indexed: 11/20/2022]
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46
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Fogal B, Li J, Lobner D, McCullough LD, Hewett SJ. System x(c)- activity and astrocytes are necessary for interleukin-1 beta-mediated hypoxic neuronal injury. J Neurosci 2007; 27:10094-105. [PMID: 17881516 PMCID: PMC6672668 DOI: 10.1523/jneurosci.2459-07.2007] [Citation(s) in RCA: 96] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The purpose of this study was to elucidate the cellular/biochemical pathway(s) by which interleukin-1beta (IL-1beta) contributes to the pathogenesis of hypoxic-ischemic brain damage. In vivo, IL-1 receptor type I (IL-1RI)-deficient mice showed smaller infarcts and less neurological deficits than wild-type animals after a 90 min reversible middle cerebral artery occlusion. In vitro, IL-1beta mediated an enhancement of hypoxic neuronal injury in murine cortical cultures that was lacking in cultures derived from IL-1RI null mutant animals and was blocked by the IL-1 receptor antagonist or an IL-1RI blocking antibody. This IL-1beta-mediated potentiation of hypoxic neuronal injury was associated with an increase in both cellular cystine uptake ([cystine]i) and extracellular glutamate levels ([glutamate]e) and was prevented by either ionotropic glutamate receptor antagonism or removal of L-cystine, suggesting a role for the cystine/glutamate antiporter (System x(c)-). Indeed, dual System x(c)-/metabotropic glutamate receptor subunit 1 (mGluR1) antagonism but not selective mGluR1 antagonism prevented neuronal injury. Additionally, cultures derived from mGluR1-deficient mice exhibited the same potentiation in injury after treatment with IL-1beta as wild-type cultures, an effect prevented by System x(c)-/mGluR1 antagonism. Finally, assessment of System x(c)- function and kinetics in IL-1beta-treated cultures revealed an increase in velocity of cystine transport (Vmax), in the absence of a change in affinity (Km). Neither the enhancement in [cystine]i, [glutamate]e, or neuronal injury were observed in chimeric cultures consisting of IL-1RI(+/+) neurons plated on top of IL-1RI(-/-) astrocytes, highlighting the importance of astrocyte-mediated alterations in System x(c)- as a novel contributor to the development and progression of hypoxic neuronal injury.
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Affiliation(s)
| | - Jun Li
- Neurology, University of Connecticut Health Center, Farmington, Connecticut 06030, and
| | - Doug Lobner
- Department of Biomedical Sciences, Marquette University, Milwaukee, Wisconsin 53233
| | - Louise D. McCullough
- Neurology, University of Connecticut Health Center, Farmington, Connecticut 06030, and
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47
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Mechanisms of interleukin-6 synthesis and release induced by interleukin-1 and cell depolarisation in neurones. Mol Cell Neurosci 2007; 37:110-8. [PMID: 17933551 DOI: 10.1016/j.mcn.2007.09.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2007] [Revised: 08/17/2007] [Accepted: 09/04/2007] [Indexed: 11/23/2022] Open
Abstract
Cytokines are important mediators of the immune response to infection and injury and are produced mainly by lymphocytes or monocytes. Many aspects of the acute phase response are mediated by the actions of cytokines such as interleukin (IL)-1 and IL-6 within the brain. IL-1-induced IL-6 expression in neuronal cells has been described previously, but the mechanisms of IL-6 transport and release remain unknown. We show here that IL-1 induces IL-6 gene and protein expression in mouse primary cortical neurones, but that the IL-6 protein is stored intracellularly in the perinuclear area. Depolarisation of IL-1-treated neurones caused the axonal transport and release of IL-6 into the extracellular compartment. The transport and release occurs via an active mechanism (blocked by colchicine) through the Golgi apparatus, but not secretogranin-II vesicles. These results reveal a neuronal-specific mechanism of IL-6 synthesis, transport and release in response to IL-1 and cell depolarisation.
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48
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Shu HF, Wang BR, Wang SR, Yao W, Huang HP, Zhou Z, Wang X, Fan J, Wang T, Ju G. IL-1beta inhibits IK and increases [Ca2+]i in the carotid body glomus cells and increases carotid sinus nerve firings in the rat. Eur J Neurosci 2007; 25:3638-47. [PMID: 17610583 DOI: 10.1111/j.1460-9568.2007.05586.x] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Increasing evidence indicates that there exists a reciprocal communication between the immune system and the brain. Interleukin 1beta (IL-1beta), a proinflammatory cytokine produced during immune challenge, is believed to be one of the mediators of immune-to-brain communication, but how it gets into the brain is unknown because of its large molecular weight and difficulty in crossing the blood-brain barrier. Our previous work has demonstrated that IL-1 receptor type I is strongly expressed in the glomus cells of rat carotid body (CB), a well characterized polymodal chemoreceptive organ which serves not only for the detection of hypoxia, hypercapnia and acidity, but also for low temperature and blood glucose. The present study was designed to test whether IL-1beta could stimulate the CB glomus cells and alter the discharge properties in the carotid sinus nerve, the afferent nerve innervating the organ. The results from whole-cell patch-clamp recordings and calcium imaging showed that extracellular application of IL-1beta significantly decreased the outward potassium current and triggered a transient rise in [Ca(2+)](i) in the cultured glomus cells of rat CB. Furthermore, by using extracellular recordings and pharmacological intervention, it was found that IL-1beta stimulation of the CB in the anaesthetized rat in vivo significantly increased the discharge rate in the carotid sinus nerve, most probably mediated by ATP release. This experiment provides evidence that the CB responds to cytokine stimulation and proposes the possibility that the CB might play a role in immune-to-brain communication.
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Affiliation(s)
- Hai-Feng Shu
- Institute of Neurosciences, Fourth Military Medical University, Xi'an, 710032, China
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49
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Tabarean IV, Korn H, Bartfai T. Interleukin-1beta induces hyperpolarization and modulates synaptic inhibition in preoptic and anterior hypothalamic neurons. Neuroscience 2006; 141:1685-95. [PMID: 16777343 DOI: 10.1016/j.neuroscience.2006.05.007] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2006] [Revised: 05/03/2006] [Accepted: 05/04/2006] [Indexed: 11/26/2022]
Abstract
Most of the inflammatory effects of the cytokine interleukin 1beta (IL-1beta) are mediated by induction of cyclooxygenase (COX)2 and the subsequent synthesis and release of prostaglandin E2. This transcription-dependent process takes 45-60 min, but IL-1beta, a well-characterized endogenous pyrogen also exerts faster neuronal actions in the preoptic area/anterior hypothalamus. Here, we have studied the fast (1-3 min) signaling by IL-1beta using whole-cell patch clamp recordings in preoptic area/anterior hypothalamus neurons. Exposure to IL-1beta (0.1-1 nM) hyperpolarized a subset ( approximately 20%) of preoptic area/anterior hypothalamus neurons, decreased their input resistance and reduced their firing rate. These effects were associated with an increased frequency of bicuculline-sensitive spontaneous inhibitory postsynaptic currents and putative miniature inhibitory postsynaptic currents, strongly suggesting a presynaptic mechanism of action. These effects require the type 1 interleukin 1 receptor (IL-1R1), and the adapter protein myeloid differentiation primary response protein (MyD88), since they were not observed in cultures obtained from IL-1R1 (-/-) or from MyD88 (-/-) mice. Ceramide, a second messenger of the IL-1R1-dependent fast signaling cascade, is produced by IL-1R1-MyD88-mediated activation of the neutral sphingomyelinase. C2-ceramide, its cell penetrating analog, also increased the frequency of miniature inhibitory postsynaptic currents in a subset of cells. Both IL-1beta and ceramide reduced the delayed rectifier and the A-type K(+) currents in preoptic area/anterior hypothalamus neurons. The latter effect may account in part for the increased spontaneous inhibitory postsynaptic current frequency as suggested by experiments with the A-type K(+) channel blockers 4-aminopyridine. Taken together our data suggest that IL-1beta inhibits the activity of preoptic area/anterior hypothalamus neurons by increasing the presynaptic release of GABA.
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Affiliation(s)
- I V Tabarean
- Harold L. Dorris Neurological Research Center, Molecular and Integrative Neurosciences Department, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
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50
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Andre R, Moggs JG, Kimber I, Rothwell NJ, Pinteaux E. Gene regulation by IL-1beta independent of IL-1R1 in the mouse brain. Glia 2006; 53:477-83. [PMID: 16358337 DOI: 10.1002/glia.20302] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Interleukin-1 (IL-1) is a key pro-inflammatory cytokine that has diverse actions in the brain as a regulator of host defense responses and a mediator of inflammation. Two major agonists, IL-1alpha and IL-1beta, bind to a single known functional type-1 IL-1 receptor (IL-1RI) that associates with the accessory protein (IL-1RAcP), resulting in signal transduction. However, recent evidence suggests that some actions of IL-1 in the brain may be independent of IL-1R1 and the classical IL-1 signaling pathways, pointing to an as-yet unidentified functional receptor for IL-1. In this study, we have used cDNA microarray-based gene expression profiling to identify the possible genes induced by IL-1beta independently of IL-1R1. IL-1beta induced potential changes (greater than 2-fold vs. vehicle-treated) in the expression of up to 1285 candidate genes in wild-type primary mixed glia, and 404 candidate genes in IL-1R1-/- cells of the same type. Real-time quantitative polymerase chain reaction (PCR) on selected genes revealed that pentraxin-3, was upregulated by IL-1beta in wild-type, but not in IL-1R1-/- mixed glia. Amongst the other genes for which expression was modified by IL-1beta in IL-1R1-/- cells, we selected alpha-syntrophin and demonstrated by real-time quantitative PCR that expression of this gene is significantly downregulated by IL-1beta in primary mixed glia prepared from wild-type, IL-1R1-/-, IL-1RAcP-/- or MyD88-/- mice. In contrast, IL-1alpha fails to downregulate alpha-syntrophin expression in wild-type or IL-1R1-/- mixed glia. These results show that IL-1beta exclusively downregulates alpha-syntrophin expression independently of IL-1R1, and suggest the expression of additional functional IL-1 receptors in the CNS.
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Affiliation(s)
- Ralph Andre
- Faculty of Life Sciences, University of Manchester, Manchester, United Kingdom
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