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Neuroinflammation Neurotrophic Cytokines in Autoimmune Demyelination: a New Role for Modulates the Immune Response and Limits Le Leukemia Inhibitory Factor Deficiency Modulates the Immune Response and Limits Autoimmune Demyelination: A New Role for Neurotrophic Cytokines in This information is current as Neuroinflammation of September 26, 2021. Ralf A. Linker, Niels Kruse, Stephanie Israel, Tao Wei, Silvia Seubert, Anja Hombach, Bettina Holtmann, Fred Luhder, Richard M. Ransohoff, Michael Sendtner and Ralf Gold Downloaded from J Immunol 2008; 180:2204-2213; ; doi: 10.4049/jimmunol.180.4.2204 http://www.jimmunol.org/content/180/4/2204 http://www.jimmunol.org/ References This article cites 43 articles, 14 of which you can access for free at: http://www.jimmunol.org/content/180/4/2204.full#ref-list-1 Why The JI? Submit online. • Rapid Reviews! 30 days* from submission to initial decision by guest on September 26, 2021 • No Triage! Every submission reviewed by practicing scientists • Fast Publication! 4 weeks from acceptance to publication *average Subscription Information about subscribing to The Journal of Immunology is online at: http://jimmunol.org/subscription Permissions Submit copyright permission requests at: http://www.aai.org/About/Publications/JI/copyright.html Email Alerts Receive free email-alerts when new articles cite this article. Sign up at: http://jimmunol.org/alerts The Journal of Immunology is published twice each month by The American Association of Immunologists, Inc., 1451 Rockville Pike, Suite 650, Rockville, MD 20852 Copyright © 2008 by The American Association of Immunologists All rights reserved. Print ISSN: 0022-1767 Online ISSN: 1550-6606. The Journal of Immunology Leukemia Inhibitory Factor Deficiency Modulates the Immune Response and Limits Autoimmune Demyelination: A New Role for Neurotrophic Cytokines in Neuroinflammation1 Ralf A. Linker,2*† Niels Kruse,* Stephanie Israel,* Tao Wei,‡ Silvia Seubert,*† Anja Hombach,* Bettina Holtmann,§ Fred Luhder,* Richard M. Ransohoff,‡ Michael Sendtner,§ and Ralf Gold* The neurotrophic cytokines ciliary neurotrophic factor and leukemia inhibitory factor (LIF) play a key role in neuronal and oligodendrocyte survival and as protective factors in neuroinflammation. To further elucidate the potential of endogenous LIF in modulating neuroinflammation, we studied myelin oligodendrocyte glycoprotein-induced experimental autoimmune encephalomyelitis in LIF knockout mice (LIF؊/؊ mice). In the late phase of active myelin oligodendrocyte glycoprotein- Downloaded from -induced experimental autoimmune encephalomyelitis, LIF؊/؊ mice exhibited a markedly milder disease course. The inflam matory infiltrate in LIF؊/؊ mice was characterized by an increase in neutrophilic granulocytes early and fewer infiltrating macrophages associated with less demyelination later in the disease. In good correlation with an effect of endogenous LIF on the immune response, we found an Ag-specific T cell-priming defect with impaired IFN-␥ production in LIF؊/؊ mice. On the molecular level, the altered recruitment of inflammatory cells is associated with distinct patterns of chemokine production /in LIF؊/؊ mice with an increase of CXCL1 early and a decrease of CCL2, CCL3, and CXCL10 later in the disease. These http://www.jimmunol.org data reveal that endogenous LIF is an immunologically active molecule in neuroinflammation. This establishes a link between LIF and the immune system which was not observed in the ciliary neurotrophic factor knockout mouse. The Journal of Immunology, 2008, 180: 2204–2213. eurotrophic cytokines play a key role in neuronal and cently, the role of CNTF and LIF was investigated in experi- oligodendrocyte survival, among them leukemia in- mental autoimmune encephalomyelitis (EAE), a model disease hibitory factor (LIF)3 and ciliary neurotrophic factor reflecting some of the typical features of the human disease N Ϫ/Ϫ (CNTF). In vitro and in vivo, these factors support differenti- multiple sclerosis (7). EAE in CNTF knockout (CNTF ) by guest on September 26, 2021 ation and survival of oligodendrocyte precursor cells (1, 2) and mice takes a more severe course with enhanced oligodendrocyte prevent oligodendrocyte apoptosis in response to serum with- apoptosis and axonal damage (8). On the other side, treatment drawal or cytokine challenge (3, 4). LIF and CNTF also support with LIF ameliorates EAE by preventing oligodendrocyte cell motoneuron survival in vitro and in vivo under different exper- death (9), whereas administration of CNTF can also interfere imental conditions (5). Thus, neurotrophic cytokines may be of with the immune system (10). great interest as protective factors not only for neurodegenera- Besides its effects on neuronal and glial cells, LIF possesses tive diseases, but also in autoimmune demyelination (6). Re- pleiotropic functions in many cell types and organs (see Ref. 11 for review) including the inhibition of embryonic stem cell differen- tiation, promotion of survival of hemopoietic precursor cells or * Institute for Multiple Sclerosis Research, University of Goettingen and Gemeinnu- † support of blastocyst implantation; the latter resulting in infertility etzige Hertie-Stiftung, Goettingen, Germany; Department of Neurology at St. Josef- Ϫ/Ϫ Hospital Ruhr-University Bochum, Bochum, Germany; ‡Neuroinflammation Re- in LIF-deficient (LIF ) mice (12). Furthermore, LIF seems to search Center, Department of Neurosciences, Lerner Research Institute, Cleveland interact with the immune system. LIFϪ/Ϫ mice display decreased Clinic Foundation, Cleveland, OH 44195; and §Institute for Clinical Neurobiology, Julius-Maximilians-Universita¨t, Wuerzburg, Germany numbers of hemopoietic stem cells in spleen and bone marrow Received for publication November 2, 2006. Accepted for publication December and an impaired Con A-mediated thymocyte stimulation (12). 1, 2007. Overexpression of LIF in T cells leads to altered immune organ The costs of publication of this article were defrayed in part by the payment of page morphology (13). Analyzing the immune response to peripheral charges. This article must therefore be hereby marked advertisement in accordance nerve injury in LIFϪ/Ϫ mice reveals a role for LIF in macro- with 18 U.S.C. Section 1734 solely to indicate this fact. phage recruitment (14, 15). Likewise, LIF deficiency modulates 1 This work was supported by the Deutsche Forschungsgemeinschaft, SFB 581, TPA1, the Institute for Multiple Sclerosis Research, University of Goettingen, the microglia/macrophage response in a model of spinal cord Bereich Humanmedizin and Gemeinnuetzige Hertie-Stiftung, and the U.S. Na- injury (16). In summary, these data suggest a proinflammatory tional Institutes of Health (RO1 NS 32151 to R.M.R.). function of LIF. Yet, other studies focusing on the immune 2 Address correspondence and reprint requests to Dr. Ralf A. Linker, Department reaction in LIFϪ/Ϫ mice after injection of CFA even point at a of Neurology, St. Josef-Hospital/Ruhr-University Bochum, Gudrunstrasse 56, D-44791 Bochum, Germany. E-mail-address: [email protected] prominent anti-inflammatory role for this cytokine (17, 18). So 3 Abbreviations used in this paper: LIF, leukemia inhibitory factor; CNTF, ciliary far, little is known on the interaction of LIF with the immune neurotrophic factor; EAE, experimental autoimmune encephalomyelitis; MOG, my- system during autoimmune inflammation of the CNS. Previous elin oligodendrocyte glycoprotein; WT, wild type; bmDC, bone marrow dendritic studies in EAE models mainly focused on the beneficial impact cell; IP10, IFN-␥-inducible protein 10. of exogenous or endogenous LIF on glial cells (9, 19). How- Copyright © 2008 by The American Association of Immunologists, Inc. 0022-1767/08/$2.00 ever, the consequences of LIF deficiency on initiation and www.jimmunol.org The Journal of Immunology 2205 course of neuroinflammatory diseases have not been investi- berglass filter paper with a 96-well harvester (Pharmacia), and radio- gated so far. activity was measured with a 96-well Betaplate liquid scintillation In this study, we have induced the model disease EAE with counter (Pharmacia). For proliferation assay of propagated MOG-specific T cells in cul- myelin oligodendrocyte glycoprotein peptide 35–55 (MOG 35–55) ture, 20,000 or 40,000 T cells were cultured with 125,000 or 250,000 Ϫ/Ϫ in LIF mice. We show that LIF deficiency results in attenuation spleen cells, respectively; otherwise, the protocol remained unchanged. of disease in the late phase of MOG-EAE with an altered compo- In some of these experiments, Ly6G-positive cells were isolated from sition and altered maintenance of the inflammatory infiltrate. These spinal cord and spleen of EAE diseased WT mice at the first maximum of disease and then titrated into the assay. All experiments were at least data suggest that endogenous LIF is an important regulator that repeated once. orchestrates T cell and macrophage responses in EAE. ELISA Materials and Methods Lymph node cells were prepared and cultured as above with medium alone Mice or in the presence of 10 ␮g/ml MOG 35–55 peptide. Supernatants were ␥ LIFϪ/Ϫ mice were backcrossed on a C57BL/6 background for Ͼ10 gen- harvested after 3 days of culture. Cytokines or chemokine (IL-2, IFN- , erations and bred at the in-house animal care facilities of the Institute of IL-6, IL-12 p35/p70, IL-5, and CCL2 (MCP-1)) were determined by sand- Ϫ/Ϫ wich ELISA, as described (21). mAb pairs and recombinant cytokine stan- Clinical Neurobiology (Wu¨rzburg, Germany). Because female LIF ␥ mice are infertile, they were maintained on a heterozygous background. dards were purchased from R&D Systems for IFN- or BD Pharmingen
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