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Consecutive Injection of High-Dose Lipopolysaccharide Modulates Microglia Polarization via TREM2 to Alter Status of Septic Mice. Brain Sci 2023; 13:brainsci13010126. [PMID: 36672106 PMCID: PMC9856382 DOI: 10.3390/brainsci13010126] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 12/29/2022] [Accepted: 01/09/2023] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND The neuroinflammation of the central nervous system (CNS) is a prevalent syndrome of brain dysfunction secondary to severe sepsis and is regulated by microglia. Triggering the receptor expressed on myeloid cells 2 (TREM2) is known to have protective functions that modulate the microglial polarization of M2 type to reduce inflammatory responses, thereby improving cognition. METHODS We examined the effect of TREM2 on the polarization state of microglia during the progression of neuroinflammation. After consecutive intraperitoneal injections of lipopolysaccharide for 7 days, we evaluated the inflammation of a septic mice model by hematoxylin-eosin (H&E) and electron microscopy, and we used immunofluorescence (IF) assays and Western blotting to visualize hippocampal sections in C57BL/6 mice to assess TREM2 expression. In addition, we analyzed the state of microglia polarization with quantitative RT-PCR. RESULT The consecutive injection of LPS for 4 days elevated systemic inflammation and caused behavioral cognitive dysfunction in the septic model. However, on Day 7, the neuroinflammation was considerably attenuated. Meanwhile, TREM2 decreased on Day 4 and increased on Day 7 in vivo. Consistently, LPS could reduce the expression of TREM2 while IFN-β enhanced TREM2 expression in vitro. TREM2 regulated the microglial M1 phenotype's conversion to the M2 phenotype. CONCLUSION Our aim in this study was to investigate the interconnection between microglia polarization and TREM2 in neuroinflammation. Our results suggested that IFN-β could modulate TREM2 expression to alter the polarization state of microglia, thereby reducing LPS-induced neuroinflammation. Therefore, TREM2 is a novel potential therapeutic target for neuroinflammation.
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da Silva Antunes R, Quiambao LG, Soldevila F, Sutherland A, Peters B, Sette A. Lack of evidence supporting a role of IFN-β and TGF-β in differential polarization of Bordetella pertussis specific-T cell responses. Cytokine 2020; 137:155313. [PMID: 33002739 DOI: 10.1016/j.cyto.2020.155313] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 09/18/2020] [Accepted: 09/21/2020] [Indexed: 10/23/2022]
Abstract
Bordetella Pertussis (BP) vaccine-induced immunity is waning worldwide despite excellent vaccine coverage. Replacement of the whole-cell inactivated vaccine (wP) by an acellular subunit vaccine (aP) is thought to play a major role and to be associated with the recurrence of whooping cough. Previously, we detected that the polarization towards a Th2 and Th1/Th17 response in aP and wP vaccinees, respectively, persists upon aP boosting in adolescents and adults. Additionally, IL-9 and TGF-β were found to be up-regulated in aP-primed donors and network analysis further identified IFN-β as a potential upstream regulator of IL-17 and IL-9. Based on these findings, we hypothesized that IFN-β produced following aP vaccination may lead to increased IL-9 and decreased IL-17 production. Also, due to the well characterized role of TGF-β in both Th17 and Th9 differentiation, we put forth that TGF-β addition to BP-stimulated CD4 + T cells might modulate IL-17 and IL-9 production. To test this hypothesis, we stimulated in vitro cultures of PBMC or isolated naive CD4 + T cells from aP vs wP donors with a pool of BP epitopes and assessed the effect of IFN-β or TGF-β in proliferative responses as well as in the cytokine secretion of IL-4, IL-9, IL-17, and IFN-γ. IFN-β reduced BP-specific proliferation in PBMC as well as cytokine production but increased IL-9, IL-4, and IFN-γ cytokines in naïve CD4 + T cells. These effects were independent of the childhood vaccination received by the donors. Similarly, TGF-β reduced BP-specific proliferation in PBMC but induced proliferation in naïve CD4 + T cells. However, stimulation was associated with a generalized inhibition of cytokine production regardless of the original aP or wP vaccination received by the donors. Our study suggests that key T cell functions such as cytokine secretion are under the control of antigen stimulation and environmental cues but molecular pathways different than the ones investigated here might underlie the long-lasting differential cytokine production associated with aP- vs wP-priming in childhood vaccination.
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Affiliation(s)
| | - Lorenzo G Quiambao
- Division of Vaccine Discovery, La Jolla Institute for Immunology, La Jolla, CA, United States
| | - Ferran Soldevila
- Division of Vaccine Discovery, La Jolla Institute for Immunology, La Jolla, CA, United States
| | - Aaron Sutherland
- Division of Vaccine Discovery, La Jolla Institute for Immunology, La Jolla, CA, United States
| | - Bjoern Peters
- Division of Vaccine Discovery, La Jolla Institute for Immunology, La Jolla, CA, United States; School of Medicine, University of California San Diego, La Jolla, CA, United States
| | - Alessandro Sette
- Division of Vaccine Discovery, La Jolla Institute for Immunology, La Jolla, CA, United States; School of Medicine, University of California San Diego, La Jolla, CA, United States
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Chu YJ, Ma WD, Thome R, Ping JD, Liu FZ, Wang MR, Zhang ML, Zhang G, Zhu L. Matrine Inhibits CNS Autoimmunity Through an IFN-β-Dependent Mechanism. Front Immunol 2020; 11:569530. [PMID: 33101289 PMCID: PMC7546369 DOI: 10.3389/fimmu.2020.569530] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Accepted: 09/10/2020] [Indexed: 12/19/2022] Open
Abstract
Matrine (MAT), a quinolizidine alkaloid component derived from the root of Sophora flavescens, suppresses experimental autoimmune encephalomyelitis (EAE), the animal model of multiple sclerosis (MS), by inducing the production of immunomodulatory molecules, e.g., IL-10. In an effort to find the upstream pathway(s) of the mechanism underlying these effects, we have tested certain upregulated immunomodulatory molecules. Among them, we found increased levels of IL-27 and IFN-β, one of the first-line MS therapies. Indeed, while low levels of IFN-β production in sera and type I interferon receptor (IFNAR1) expression in spinal cord of saline-treated control EAE mice were detected, they were significantly increased after MAT treatment. Increased numbers of CD11b+IFN-β+ microglia/infiltrating macrophages were observed in the CNS of MAT-treated mice. The key role of IFN-β induction in the suppressive effect of MAT on EAE was further verified by administration of anti-IFN-β neutralizing antibody, which largely reversed the therapeutic effect of MAT. Further, we found that, while MAT treatment induced production of IL-27 and IL-10 by CNS microglia/macrophages, this effect was significantly reduced by IFN-β neutralizing antibody. Finally, the role of IFN-β in MAT-induced IL-27 and IL-10 production was further confirmed in human monocytes in vitro. Together, our study demonstrates that MAT exerts its therapeutic effect in EAE through an IFN-β/IL-27/IL-10 pathway, and is likely a novel, safe, low-cost, and effective therapy as an alternative to exogenous IFN-β for MS.
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Affiliation(s)
- Yao-Juan Chu
- Department of Pharmacy, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Wen-Di Ma
- Department of Pharmacy, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Rodolfo Thome
- Department of Neurology, Thomas Jefferson University, Philadelphia, PA, United States
| | - Jie-Dan Ping
- Department of Clinical Laboratory, Key Clinical Laboratory of Henan Province, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Fang-Zhou Liu
- Henan Province Chinese Medicine Research Institute, Zhengzhou, China
| | - Meng-Ru Wang
- Department of Pharmacy, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Ming-Liang Zhang
- Henan Province Engineering Laboratory for Clinical Evaluation Technology of Chinese Medicine, The First Affiliated Hospital of Henan University of Chinese Medicine, Zhengzhou, China
| | - Guangxian Zhang
- Department of Neurology, Thomas Jefferson University, Philadelphia, PA, United States
| | - Lin Zhu
- Department of Pharmacy, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
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Zhang Y, Li X, Ciric B, Ma CG, Gran B, Rostami A, Zhang GX. Effect of Fingolimod on Neural Stem Cells: A Novel Mechanism and Broadened Application for Neural Repair. Mol Ther 2016; 25:401-415. [PMID: 28153091 DOI: 10.1016/j.ymthe.2016.12.008] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Revised: 11/30/2016] [Accepted: 12/02/2016] [Indexed: 12/21/2022] Open
Abstract
Inflammatory demyelination and axonal damage of the CNS are hallmarks of multiple sclerosis (MS) and its animal model, experimental autoimmune encephalomyelitis (EAE). Fingolimod (FTY720), the first FDA-approved oral medication for MS, suppresses acute disease but is less effective at the chronic stage, and whether it has a direct effect on neuroregeneration in MS and EAE remains unclear. Here we show that FTY720, at nanomolar concentrations, effectively protected survival of neural stem cells (NSCs) and enhanced their development into mature oligodendrocytes (OLGs) in vitro, primarily through the S1P3 and S1P5 receptors. In vivo, treatment with either FTY720 or NSCs alone had no effect on the secondary progressive stage of remitting-relapsing EAE, but a combination therapy with FTY720 and NSCs promoted significant recovery, including ameliorated clinical signs and CNS inflammatory demyelination, enhanced MBP synthesis and remyelination, inhibited axonal degeneration, and reduced astrogliosis. Moreover, FTY720 significantly improved incorporation and survival of transplanted NSCs in the CNS and drove their differentiation into more OLGs but fewer astrocytes, thus promoting remyelination and CNS repair processes in situ. Our data demonstrate a novel effect of FTY720 on NSC differentiation and remyelination, broadening its possible application to NSC-based therapy in the secondary progressive stage of MS.
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MESH Headings
- Animals
- Cell Differentiation/drug effects
- Disease Models, Animal
- Encephalomyelitis, Autoimmune, Experimental/etiology
- Encephalomyelitis, Autoimmune, Experimental/metabolism
- Encephalomyelitis, Autoimmune, Experimental/pathology
- Encephalomyelitis, Autoimmune, Experimental/therapy
- Extracellular Signal-Regulated MAP Kinases/metabolism
- Fingolimod Hydrochloride/pharmacology
- Humans
- Mice
- Multiple Sclerosis
- Myelin Sheath/drug effects
- Myelin Sheath/metabolism
- Nerve Regeneration
- Neural Stem Cells/cytology
- Neural Stem Cells/drug effects
- Neural Stem Cells/metabolism
- Oligodendroglia/cytology
- Oligodendroglia/drug effects
- Oligodendroglia/metabolism
- Receptors, Lysosphingolipid/metabolism
- Signal Transduction
- Stem Cell Transplantation
- Treatment Outcome
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Affiliation(s)
- Yuan Zhang
- Department of Neurology, Thomas Jefferson University, Philadelphia, PA 19107, USA; Key Laboratory of the Ministry of Education for Medicinal Resources and Natural Pharmaceutical Chemistry, College of Life Sciences, Shaanxi Normal University, Xi'an 710119, China
| | - Xing Li
- Department of Neurology, Thomas Jefferson University, Philadelphia, PA 19107, USA; Key Laboratory of the Ministry of Education for Medicinal Resources and Natural Pharmaceutical Chemistry, College of Life Sciences, Shaanxi Normal University, Xi'an 710119, China
| | - Bogoljub Ciric
- Department of Neurology, Thomas Jefferson University, Philadelphia, PA 19107, USA
| | - Cun-Gen Ma
- Institute of Brain Science, Department of Neurology, Shanxi Datong University Medical School, Datong 037009, China
| | - Bruno Gran
- Clinical Neurology Research Group, Division of Clinical Neuroscience, University of Nottingham School of Medicine, Nottingham NG7 2RD, UK
| | - Abdolmohamad Rostami
- Department of Neurology, Thomas Jefferson University, Philadelphia, PA 19107, USA
| | - Guang-Xian Zhang
- Department of Neurology, Thomas Jefferson University, Philadelphia, PA 19107, USA.
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Wang D, Ghosh D, Islam SMT, Moorman CD, Thomason AE, Wilkinson DS, Mannie MD. IFN-β Facilitates Neuroantigen-Dependent Induction of CD25+ FOXP3+ Regulatory T Cells That Suppress Experimental Autoimmune Encephalomyelitis. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2016; 197:2992-3007. [PMID: 27619998 PMCID: PMC5101178 DOI: 10.4049/jimmunol.1500411] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Accepted: 08/07/2016] [Indexed: 12/11/2022]
Abstract
This study introduces a flexible format for tolerogenic vaccination that incorporates IFN-β and neuroantigen (NAg) in the Alum adjuvant. Tolerogenic vaccination required all three components, IFN-β, NAg, and Alum, for inhibition of experimental autoimmune encephalomyelitis (EAE) and induction of tolerance. Vaccination with IFN-β + NAg in Alum ameliorated NAg-specific sensitization and inhibited EAE in C57BL/6 mice in pretreatment and therapeutic regimens. Tolerance induction was specific for the tolerogenic vaccine Ag PLP178-191 or myelin oligodendrocyte glycoprotein (MOG)35-55 in proteolipid protein- and MOG-induced models of EAE, respectively, and was abrogated by pretreatment with a depleting anti-CD25 mAb. IFN-β/Alum-based vaccination exhibited hallmarks of infectious tolerance, because IFN-β + OVA in Alum-specific vaccination inhibited EAE elicited by OVA + MOG in CFA but not EAE elicited by MOG in CFA. IFN-β + NAg in Alum vaccination elicited elevated numbers and percentages of FOXP3+ T cells in blood and secondary lymphoid organs in 2D2 MOG-specific transgenic mice, and repeated boosters facilitated generation of activated CD44high CD25+ regulatory T cell (Treg) populations. IFN-β and MOG35-55 elicited suppressive FOXP3+ Tregs in vitro in the absence of Alum via a mechanism that was neutralized by anti-TGF-β and that resulted in the induction of an effector CD69+ CTLA-4+ IFNAR+ FOXP3+ Treg subset. In vitro IFN-β + MOG-induced Tregs inhibited EAE when transferred into actively challenged recipients. Unlike IFN-β + NAg in Alum vaccines, vaccination with TGF-β + MOG35-55 in Alum did not increase Treg percentages in vivo. Overall, this study indicates that IFN-β + NAg in Alum vaccination elicits NAg-specific, suppressive CD25+ Tregs that inhibit CNS autoimmune disease. Thus, IFN-β has the activity spectrum that drives selective responses of suppressive FOXP3+ Tregs.
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Affiliation(s)
- Duncheng Wang
- Department of Microbiology and Immunology, Brody School of Medicine, East Carolina University, Greenville, NC 27834; and
| | - Debjani Ghosh
- Department of Microbiology and Immunology, Brody School of Medicine, East Carolina University, Greenville, NC 27834; and
| | - S M Touhidul Islam
- Department of Microbiology and Immunology, Brody School of Medicine, East Carolina University, Greenville, NC 27834; and
| | - Cody D Moorman
- Department of Microbiology and Immunology, Brody School of Medicine, East Carolina University, Greenville, NC 27834; and
| | - Ashton E Thomason
- Department of Microbiology and Immunology, Brody School of Medicine, East Carolina University, Greenville, NC 27834; and
| | - Daniel S Wilkinson
- Department of Microbiology and Immunology, Brody School of Medicine, East Carolina University, Greenville, NC 27834; and
| | - Mark D Mannie
- Department of Microbiology and Immunology, Brody School of Medicine, East Carolina University, Greenville, NC 27834; and
- The Harriet and John Wooten Laboratory for Alzheimer's and Neurodegenerative Disease Research, Brody School of Medicine, East Carolina University, Greenville, NC 27834
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Wong N, Nguyen T, Brenu EW, Broadley S, Staines D, Marshall-Gradisnik S. A Comparison of Cytokine Profiles of Chronic Fatigue Syndrome/Myalgic Encephalomyelitis and Multiple Sclerosis Patients. ACTA ACUST UNITED AC 2015. [DOI: 10.4236/ijcm.2015.610103] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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IFN-β inhibits T cells accumulation in the central nervous system by reducing the expression and activity of chemokines in experimental autoimmune encephalomyelitis. Mol Immunol 2014; 64:152-62. [PMID: 25433436 DOI: 10.1016/j.molimm.2014.11.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Revised: 11/10/2014] [Accepted: 11/11/2014] [Indexed: 11/21/2022]
Abstract
Multiple sclerosis and its animal model, experimental autoimmune encephalomyelitis (EAE), are chronic neuroinflammatory autoimmune diseases characterized by axonal loss, demyelination and neurodegeneration of the central nervous system (CNS). Overactivation of CD4(+)T cells, especially the Th1 and Th17 subsets, is thought to play a causal role in this disease. In this study, we investigated the immunomodulatory effects of IFN-β treatment in EAE. IFN-β significantly inhibits disease severity, and decreases levels of CCR2, CCR4, CCR5, CCR6 and CXCR3 in the CNS. This was associated with fewer Th1/Th17 cells expressing these chemokine receptors. Furthermore, levels of their corresponding ligands CCL2, CCL3, CCL4, CCL5, CCL20, CCL22 and CXCL10 were also reduced, coinciding with reduced CNS inflammation and demyelination. Chemokine expression significantly correlated with disease severity. Furthermore, we demonstrate that IFN-β reduces CCL2/CCL5 induced-T cell migration by inhibiting p38-MAPK and ERK1/2 activation. Our results reveal that IFN-β reduces the expression of chemokines and chemokine receptors expressed by encephalitogenic Th1/Th17 cells, thereby decreasing their migration into the CNS.
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Brod SA, Bauer VL. Ingested (oral) tocilizumab inhibits EAE. Cytokine 2014; 68:86-93. [PMID: 24845797 DOI: 10.1016/j.cyto.2014.04.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 03/31/2014] [Accepted: 04/04/2014] [Indexed: 12/11/2022]
Abstract
BACKGROUND Blocking the activity of IL-6 can inhibit autoimmune diseases such as rheumatoid arthritis and Crohn's disease. OBJECTIVE We examined whether an antibody against IL-6, tocilizumab (TCZ) (Actemra®), used clinically in rheumatoid arthritis (RA) would have similar anti-inflammatory effects in EAE after oral administration. DESIGN/METHOD B6 mice were immunized with MOG peptide 35-55 and gavaged with control saline or TCZ during ongoing disease. Splenocytes, CD4(+) T cells or macrophages/monocyte lineage cells (CD11b(+)) from control fed or TCZ fed mice were adoptively transferred into active MOG peptide 35-55 immunized recipient mice during ongoing disease. Actively fed and recipient mice were examined for disease inhibition, inflammation, and cytokine responses. RESULTS Ingested (oral) TCZ inhibited ongoing disease and decreased inflammation. Adoptively transferred cells from TCZ fed donors protected against actively induced disease and decreased inflammation. There was a decrease in IL-6 in actively treated spleen, decrease in TNF-α, Th1-like cytokine IL-12 and increase in Th2-like cytokine IL-10 in active fed and adoptively treated recipients. CONCLUSIONS Ingested (orally administered) TCZ can inhibit disease, CNS inflammation, decrease pro-inflammatory Th1-like cytokines and increase Th2-like anti-inflammatory cytokines.
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Affiliation(s)
- Staley A Brod
- Department of Neurology, University of Texas-Houston, Health Science Center, 6431 Fannin St, Houston, TX 77030, United States.
| | - Victoria L Bauer
- Department of Neurology, University of Texas-Houston, Health Science Center, 6431 Fannin St, Houston, TX 77030, United States
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Reick C, Ellrichmann G, Thöne J, Scannevin RH, Saft C, Linker RA, Gold R. Neuroprotective dimethyl fumarate synergizes with immunomodulatory interferon beta to provide enhanced axon protection in autoimmune neuroinflammation. Exp Neurol 2014; 257:50-6. [PMID: 24731948 DOI: 10.1016/j.expneurol.2014.04.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2013] [Revised: 03/26/2014] [Accepted: 04/04/2014] [Indexed: 12/21/2022]
Abstract
INTRODUCTION Despite recent advances in development of treatments for multiple sclerosis, there is still an unmet need for more effective and also safe therapies. Based on the modes of action of interferon-beta (IFN-β) and dimethyl fumarate (DMF), we hypothesized that anti-inflammatory and neuroprotective effects may synergize in experimental autoimmune encephalomyelitis (EAE). METHODS EAE was induced in C57BL/6 mice by immunization with MOG35-55-peptide. Murine IFN-β was injected s.c. every other day at 10.000IU, and DMF was provided at 15mg/kg by oral gavage twice daily. Control mice received PBS injections and were treated by oral gavage with the vehicle methylcellulose. Mice were scored daily by blinded observers and histological, FACS and cytokine studies were performed to further elucidate the underlying mechanism of action. RESULTS Combination therapy significantly ameliorated EAE disease course in comparison to controls and monotherapy with IFN-β. Histological analyses showed a significant effect on axon preservation with almost twice as much axons present in inflamed lesions as compared to control. Remarkably, the effect on axonal preservation was more pronounced under combination therapy than with both monotherapies. Neither monotherapy nor combination therapy demonstrated modulation of cytokines and frequency of antigen presenting cells. DISCUSSION Combination of IFN-β and DMF resulted in greater beneficial effects with improved tissue protection as compared to the respective monotherapies. Further combination studies of these safe therapies in human disease are warranted.
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Affiliation(s)
- Christiane Reick
- Department of Neurology St. Josef-Hospital, Ruhr-University Bochum, Germany; International Graduate School of Neuroscience, Ruhr-University Bochum, Germany
| | - Gisa Ellrichmann
- Department of Neurology St. Josef-Hospital, Ruhr-University Bochum, Germany.
| | - Jan Thöne
- Department of Neurology St. Josef-Hospital, Ruhr-University Bochum, Germany
| | | | - Carsten Saft
- Department of Neurology St. Josef-Hospital, Ruhr-University Bochum, Germany
| | - Ralf A Linker
- Department of Neurology, University of Erlangen, Germany
| | - Ralf Gold
- Department of Neurology St. Josef-Hospital, Ruhr-University Bochum, Germany; International Graduate School of Neuroscience, Ruhr-University Bochum, Germany
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Regulatory T-cell vaccination independent of auto-antigen. Exp Mol Med 2014; 46:e82. [PMID: 24626168 PMCID: PMC3972794 DOI: 10.1038/emm.2014.4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Accepted: 12/06/2013] [Indexed: 12/21/2022] Open
Abstract
To date, efforts to treat autoimmune diseases have primarily focused on the disease symptoms rather than on the cause of the disease. In large part, this is attributed to not knowing the responsible auto-antigens (auto-Ags) for driving the self-reactivity coupled with the poor success of treating autoimmune diseases using oral tolerance methods. Nonetheless, if tolerogenic approaches or methods that stimulate regulatory T (Treg) cells can be devised, these could subdue autoimmune diseases. To forward such efforts, our approach with colonization factor antigen I (CFA/I) fimbriae is to establish bystander immunity to ultimately drive the development of auto-Ag-specific Treg cells. Using an attenuated Salmonella vaccine expressing CFA/I fimbriae, fimbriae-specific Treg cells were induced without compromising the vaccine's capacity to protect against travelers' diarrhea or salmonellosis. By adapting the vaccine's anti-inflammatory properties, it was found that it could also dampen experimental inflammatory diseases resembling multiple sclerosis (MS) and rheumatoid arthritis. Because of this bystander effect, disease-specific Treg cells are eventually induced to resolve disease. Interestingly, this same vaccine could elicit the required Treg cell subset for each disease. For MS-like disease, conventional CD25+ Treg cells are stimulated, but for arthritis CD39+ Treg cells are induced instead. This review article will examine the potential of treating autoimmune diseases without having previous knowledge of the auto-Ag using an innocuous antigen to stimulate Treg cells via the production of transforming growth factor-β and interleukin-10.
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Fillatreau S, Anderton SM. B-cell function in CNS inflammatory demyelinating disease: a complexity of roles and a wealth of possibilities. Expert Rev Clin Immunol 2014; 3:565-78. [DOI: 10.1586/1744666x.3.4.565] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Schreiner B, Bailey SL, Miller SD. T-cell response dynamics in animal models of multiple sclerosis: implications for immunotherapies. Expert Rev Clin Immunol 2014; 3:57-72. [DOI: 10.1586/1744666x.3.1.57] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Kochetkova I, Thornburg T, Callis G, Holderness K, Maddaloni M, Pascual DW. Oral Escherichia coli colonization factor antigen I fimbriae ameliorate arthritis via IL-35, not IL-27. THE JOURNAL OF IMMUNOLOGY 2013; 192:804-16. [PMID: 24337375 DOI: 10.4049/jimmunol.1302018] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
A Salmonella therapeutic expressing enterotoxigenic Escherichia coli colonization factor Ag I (CFA/I) fimbriae protects against collagen-induced arthritis (CIA) by eliciting two regulatory T cell (Treg) subsets: TGF-β-producing Foxp3(-)CD39(+)CD4(+) T cells and IL-10-producing Foxp3(+)CD39(+)CD4(+) T cells. However, it is unclear whether CFA/I fimbriae alone are protective and whether other regulatory cytokines are involved, especially in the context for the EBI3-sharing cytokines, Treg-derived IL-35 and APC-derived IL-27, both capable of suppressing Th17 cells and regulating autoimmune diseases. Subsequent evaluation revealed that a single oral dose of purified, soluble CFA/I fimbriae protected against CIA as effectively as did Salmonella-CFA/I and found that Foxp3(+)CD39(+)CD4(+) T cells were the source of secreted IL-35, whereas IL-27 production by CD11c(+) cells was inhibited. Inquiring into their relevance, CFA/I fimbriae-treated IL-27R-deficient (WSX-1(-/-)) mice were equally protected against CIA as were wild-type mice, suggesting a limited role for IL-27. In contrast, CFA/I fimbriae-mediated protection was abated in EBI3(-/-) mice, accompanied by the loss of TGF-β- and IL-10-producing Tregs. Adoptive transfer of C57BL/6 CD39(+)CD4(+) T cells to EBI3(-/-) mice with concurrent CFA/I plus IL-35 treatment effectively stimulated Tregs suppressing proinflammatory collagen II-specific Th cells. In contrast, recipients cotransferred with C57BL/6 and EBI3(-/-) CD39(+)CD4(+) T cells and treated with CFA/I plus IL-35 were not protected, implicating the importance of endogenous IL-35 for conferring CFA/I-mediated protection. Thus, CFA/I fimbriae stimulate IL-35 required for the coinduction of TGF-β and IL-10.
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Affiliation(s)
- Irina Kochetkova
- Department of Immunology and Infectious Diseases, Montana State University, Bozeman, MT 59717
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Kozela E, Juknat A, Kaushansky N, Rimmerman N, Ben-Nun A, Vogel Z. Cannabinoids decrease the th17 inflammatory autoimmune phenotype. J Neuroimmune Pharmacol 2013; 8:1265-76. [PMID: 23892791 DOI: 10.1007/s11481-013-9493-1] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2013] [Accepted: 07/15/2013] [Indexed: 12/22/2022]
Abstract
Cannabinoids, the Cannabis constituents, are known to possess anti-inflammatory properties but the mechanisms involved are not understood. Here we show that the main psychoactive cannabinoid, Δ-9-tetrahydrocannabinol (THC), and the main nonpsychoactive cannabinoid, cannabidiol (CBD), markedly reduce the Th17 phenotype which is known to be increased in inflammatory autoimmune pathologies such as Multiple Sclerosis. We found that reactivation by MOG35-55 of MOG35-55-specific encephalitogenic T cells (cells that induce Experimental Autoimmune Encephalitis when injected to mice) in the presence of spleen derived antigen presenting cells led to a large increase in IL-17 production and secretion. In addition, we found that the cannabinoids CBD and THC dose-dependently (at 0.1-5 μM) suppressed the production and secretion of this cytokine. Moreover, the mRNA and protein of IL-6, a key factor in Th17 induction, were also decreased. Pretreatment with CBD also resulted in increased levels of the anti-inflammatory cytokine IL-10. Interestingly, CBD and THC did not affect the levels of TNFα and IFNγ. The downregulation of IL-17 secretion by these cannabinoids does not seem to involve the CB1, CB2, PPARγ, 5-HT1A or TRPV1 receptors. In conclusion, the results show a unique cannabinoid modulation of the autoimmune cytokine milieu combining suppression of the pathogenic IL-17 and IL-6 cytokines along with boosting the expression of the anti-inflammatory cytokine IL-10.
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Affiliation(s)
- Ewa Kozela
- The Dr Miriam and Sheldon G. Adelson Center for the Biology of Addictive Diseases, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel,
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15
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Fitzgerald DC, Fonseca-Kelly Z, Cullimore ML, Safabakhsh P, Saris CJM, Zhang GX, Rostami A. Independent and interdependent immunoregulatory effects of IL-27, IFN-β, and IL-10 in the suppression of human Th17 cells and murine experimental autoimmune encephalomyelitis. THE JOURNAL OF IMMUNOLOGY 2013; 190:3225-34. [PMID: 23455508 DOI: 10.4049/jimmunol.1200141] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
IFN-β, IL-27, and IL-10 have been shown to exert a range of similar immunoregulatory effects in murine and human experimental systems, particularly in Th1- and Th17-mediated models of autoimmune inflammatory disease. In this study we sought to translate some of our previous findings in murine systems to human in vitro models and delineate the interdependence of these different cytokines in their immunoregulatory effects. We demonstrate that human IL-27 upregulates IL-10 in T cell-activated PBMC cultures and that IFN-β drives IL-27 production in activated monocytes. IFN-β-driven IL-27 is responsible for the upregulation of IL-10, but not IL-17 suppression, by IFN-β in human PBMCs. Surprisingly, IL-10 is not required for the suppression of IL-17 by either IL-27 or IFN-β in this model or in de novo differentiating Th17 cells, nor is IL-27 signaling required for the suppression of experimental autoimmune encephalomyelitis (EAE) by IFN-β in vivo. Furthermore, and even more surprisingly, IL-10 is not required for the suppression of Th17-biased EAE by IL-27, in sharp contrast to Th1-biased EAE. In conclusion, IFN-β and IL-27 both induce human IL-10, both suppress human Th17 responses, and both suppress murine EAE. However, IL-27 signaling is not required for the therapeutic effect of IFN-β in EAE. Suppression of Th17-biased EAE by IL-27 is IL-10-independent, in contrast to its mechanism of action in Th1-biased EAE. Taken together, these findings delineate a complex set of interdependent and independent immunoregulatory mechanisms of IFN-β, IL-27, and IL-10 in human experimental models and in murine Th1- and Th17-driven autoimmunity.
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Affiliation(s)
- Denise C Fitzgerald
- Centre for Infection and Immunity, Queen's University Belfast, Belfast BT9 7AE, Northern Ireland, United Kingdom.
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16
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Guan H, Nagarkatti PS, Nagarkatti M. CD44 Reciprocally regulates the differentiation of encephalitogenic Th1/Th17 and Th2/regulatory T cells through epigenetic modulation involving DNA methylation of cytokine gene promoters, thereby controlling the development of experimental autoimmune encephalomyelitis. THE JOURNAL OF IMMUNOLOGY 2011; 186:6955-64. [PMID: 21551360 DOI: 10.4049/jimmunol.1004043] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
CD44 is expressed by a variety of cells, including glial and T cells. Furthermore, in the demyelinating lesions of multiple sclerosis, CD44 expression is chronically elevated. In this study, we demonstrate that targeted deletion of CD44 attenuated myelin oligodendrocyte glycoprotein peptide-induced experimental autoimmune encephalitomyelitis (EAE) through novel regulatory mechanisms affecting Th differentiation. Specifically, by developing chimeras and using adoptive transfer experiments, we noted that CD44 deficiency on CD4(+) T cells, but not other cells, conferred protection against EAE induction. CD44 expression played a crucial role in Th differentiation, inasmuch as deletion of CD44 inhibited Th1/Th17 differentiation while simultaneously enhancing Th2/regulatory T cell differentiation. In contrast, expression of CD44 promoted Th1/Th17 differentiation. When osteopontin and hyaluronic acid, the two major ligands of CD44, were tested for their role in Th differentiation, osteopontin, but not hyaluronic acid, promoted Th1/Th17 differentiation. Furthermore, activation of CD44(+) encephalitogenic T cells with myelin oligodendrocyte glycoprotein peptide led to demethylation at the ifnγ/il17a promoter region while displaying hypermethylation at the il4/foxp3 gene promoter. Interestingly, similar activation of CD44-deficient encephalitogenic T cells led to increased hypermethylation of ifnγ/il17a gene and marked demethylation of il4/foxp3 gene promoter. Together, these data suggested that signaling through CD44, in encephalitogenic T cells, plays a crucial role in the differentiation of Th cells through epigenetic regulation, specifically DNA methylation of Th1/Th17 and Th2 cytokine genes. The current study also suggests that molecular targeting of CD44 receptor to promote a switch from Th1/Th17 to Th2/regulatory T cell differentiation may provide a novel treatment modality against EAE.
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Affiliation(s)
- Hongbing Guan
- Department of Pathology, Microbiology and Immunology, University of South Carolina School of Medicine, Columbia, SC 29209, USA
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17
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Brück W, Wegner C. Insight into the mechanism of laquinimod action. J Neurol Sci 2011; 306:173-9. [PMID: 21429524 DOI: 10.1016/j.jns.2011.02.019] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2010] [Revised: 10/11/2010] [Accepted: 02/16/2011] [Indexed: 12/12/2022]
Abstract
Laquinimod is a small, novel, orally active, well-tolerated molecule that significantly reduced gadolinium-enhancing lesions in patients with multiple sclerosis (MS). Orally administered laquinimod was found to be present within the central nervous system (CNS) in both healthy mice and mice with experimental autoimmune encephalomyelitis (EAE). Laquinimod inhibits development of both acute and chronic EAE. Furthermore, laquinimod minimizes inflammation, demyelination and axonal damage in MOG-induced EAE in mice treated at disease induction and following clinical disease onset. In vitro, laquinimod down-regulates secretion of pro-inflammatory cytokines and enhances production of anti-inflammatory cytokines from peripheral blood mononuclear cells (PBMCs) derived from healthy subjects and untreated relapsing remitting (RR) MS patients. Additionally, patients treated with laquinimod demonstrate up-regulation of brain-derived neurotrophic factor (BDNF) in the serum. In conclusion, treatment with laquinimod is effective in reducing inflammation, demyelination and axonal damage.
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Affiliation(s)
- W Brück
- Department of Neuropathology, University Medical Center, Georg-August University, Göttingen, Germany.
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18
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Galligan CL, Pennell LM, Murooka TT, Baig E, Majchrzak-Kita B, Rahbar R, Fish EN. Interferon-beta is a key regulator of proinflammatory events in experimental autoimmune encephalomyelitis. Mult Scler 2010; 16:1458-73. [PMID: 20935030 DOI: 10.1177/1352458510381259] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
BACKGROUND Interferon (IFN)-β is an effective therapy for relapsing-remitting multiple sclerosis, yet its mechanism of action remains ill-defined. OBJECTIVES Our objective was to characterize the role of IFN-β in immune regulation in experimental autoimmune encephalomyelitis (EAE). METHODS IFN-β(+/+) and IFN-β(-/-) mice were immunized with myelin oligodendrocyte glycoprotein peptide in the presence or absence of IFN-β, to induce EAE. Disease pathogenesis was monitored in the context of incidence, time of onset, clinical score, and immune cell activation in the brains, spleens and lymph nodes of affected mice. RESULTS Compared with IFN-β(+/+) mice, IFN-β(-/-) mice exhibited an earlier onset and a more rapid progression of EAE, increased numbers of CD11b(+) leukocytes infiltrating affected brains and an increased percentage of Th17 cells in the central nervous system and draining lymph nodes. IFN-β treatment delayed disease onset and reduced disease severity. Ex vivo experiments revealed that the lack of IFN-β results in enhanced generation of autoreactive T cells, a likely consequence of the absence of IFN-β-regulated events in both the CD4(+) T cells and antigen-presenting dendritic cells. Gene expression analysis of IFN-β-treated bone marrow macrophages (CD11b(+)) identified modulation of genes affecting T cell proliferation and Th17 differentiation. CONCLUSIONS We conclude that IFN-β acts to suppress the generation of autoimmune-inducing Th17 cells during the development of disease as well as modulating pro-inflammatory mediators.
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Affiliation(s)
- C L Galligan
- Toronto General Research Institute, University Health Network, Toronto, Canada
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19
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Croxford AL, Kurschus FC, Waisman A. Mouse models for multiple sclerosis: historical facts and future implications. Biochim Biophys Acta Mol Basis Dis 2010; 1812:177-83. [PMID: 20600870 DOI: 10.1016/j.bbadis.2010.06.010] [Citation(s) in RCA: 127] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2009] [Revised: 06/04/2010] [Accepted: 06/16/2010] [Indexed: 11/19/2022]
Abstract
Multiple sclerosis (MS) is an inflammatory and demyelinating condition of the CNS, characterized by perivascular infiltrates composed largely of T lymphocytes and macrophages. Although the precise cause remains unknown, numerous avenues of research support the hypothesis that autoimmune mechanisms play a major role in the development of the disease. Pathologically similar lesions to those seen in MS can be induced in laboratory rodents by immunization with CNS-derived antigens. This form of disease induction, broadly termed experimental autoimmune encephalomyelitis, is frequently the starting point in MS research with respect to studying pathogenesis and creating novel treatments. Many different EAE models are available, each mimicking a particular facet of MS. These models all have common ancestry, and have developed from a single concept of immunization with self-antigen. We will discuss the major changes in immunology research, which have shaped the EAE models we use today, and discuss how current animal models of MS have resulted in successful treatments and more open questions for researchers to address.
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MESH Headings
- Animals
- Autoantigens/history
- Autoantigens/immunology
- Disease Models, Animal
- Encephalomyelitis, Autoimmune, Experimental/etiology
- Encephalomyelitis, Autoimmune, Experimental/genetics
- Encephalomyelitis, Autoimmune, Experimental/history
- Encephalomyelitis, Autoimmune, Experimental/immunology
- Gene Targeting/history
- History, 20th Century
- History, 21st Century
- Humans
- Mice
- Multiple Sclerosis/etiology
- Multiple Sclerosis/immunology
- Multiple Sclerosis/therapy
- Th17 Cells/immunology
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Affiliation(s)
- Andrew L Croxford
- Institute for Molecualr Medicine, University Medical Center of the Johannes Gutenberg University Mainz, Germany.
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20
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The TLR7 agonist, imiquimod, increases IFN-β production and reduces the severity of experimental autoimmune encephalomyelitis. J Neuroimmunol 2010; 221:107-11. [DOI: 10.1016/j.jneuroim.2010.01.006] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2009] [Revised: 01/12/2010] [Accepted: 01/13/2010] [Indexed: 02/06/2023]
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21
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Yen JH, Kong W, Ganea D. IFN-beta inhibits dendritic cell migration through STAT-1-mediated transcriptional suppression of CCR7 and matrix metalloproteinase 9. THE JOURNAL OF IMMUNOLOGY 2010; 184:3478-86. [PMID: 20190134 DOI: 10.4049/jimmunol.0902542] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
IFN-beta is an approved therapeutic option for the treatment of multiple sclerosis. The molecular mechanisms underlying the effects of IFN-beta in multiple sclerosis are not fully understood. Migration of dendritic cells (DCs) from the inflammatory site to draining lymph nodes for Ag presentation and activation of naive T cells and to the CNS for reactivation of encephalitogenic T cells requires CCR7 and matrix metalloproteinase (MMP)-9 expression. This article reports for the first time that IFN-beta inhibits CCR7 expression and MMP-9 production in mature DCs and reduces their migratory capacity. The effect of IFN-beta is mediated through STAT-1. In vivo treatment with IFN-beta results in lower numbers of DCs migrating to the draining lymph node following exposure to FITC and in reduced expression of CCR7 and MMP-9 in splenic CD11c(+) DCs following LPS administration. IFN-beta and IFN-gamma share the same properties in terms of their effects on CCR7, MMP-9, and DC migration, but they have opposite effects on IL-12 production. In addition, IFN-beta-treated DCs have a significantly reduced capacity for activating CD4(+) T cells and generating IFN-gamma-producing Th1 cells. The suppression of mature DC migration through negative regulation of CCR7 and MMP-9 expression represents a novel mechanism for the therapeutic effect of IFN-beta.
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Affiliation(s)
- Jui-Hung Yen
- Department of Microbiology and Immunology, Temple University School of Medicine, Philadelphia, PA 19140, USA
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22
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Mannie MD, Abbott DJ, Blanchfield JL. Experimental autoimmune encephalomyelitis in Lewis rats: IFN-beta acts as a tolerogenic adjuvant for induction of neuroantigen-dependent tolerance. THE JOURNAL OF IMMUNOLOGY 2009; 182:5331-41. [PMID: 19380780 DOI: 10.4049/jimmunol.0803756] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Cytokine-Ag fusion proteins represent a novel approach for induction of Ag-specific tolerance and may constitute an efficient therapy for autoimmune disease. This study addressed whether a fusion protein containing rat IFN-beta and the encephalitogenic 73-87 determinant of myelin basic protein (i.e., the neuroantigen, or NAg) could prevent or treat experimental autoimmune encephalomyelitis (EAE) in Lewis rats. The optimal structure of the fusion protein was comprised of the rat IFN-beta cytokine as the N-terminal domain with an enterokinase (EK) linker to the NAg domain. Both cytokine and NAg domains had full biological activity. Subcutaneous administration of 1 nmol of IFNbeta-NAg fusion protein in saline on days -21, -14, and -7 before encephalitogenic challenge on day 0 resulted in a substantial attenuation of EAE. In contrast, administration of IFN-beta or NAg alone did not affect susceptibility to EAE. The covalent attachment of IFN-beta and NAg was not necessary, because separate injections of IFN-beta and NAg at adjacent sites were as effective as injection of IFNbeta-NAg for prevention of disease. When treatment was initiated after disease onset, the rank order of inhibitory activity was as follows: the IFNbeta-NAg fusion protein > or = a mixture of IFN-beta plus NAg > IFN-beta > NAg. The novel finding that IFN-beta acts as a tolerogenic adjuvant as well as a tolerogenic fusion partner may have significance for development of tolerogenic vaccines.
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Affiliation(s)
- Mark D Mannie
- Department of Microbiology and Immunology, East Carolina University, Brody School of Medicine, Greenville, NC 27834, USA
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23
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Tzima S, Victoratos P, Kranidioti K, Alexiou M, Kollias G. Myeloid heme oxygenase-1 regulates innate immunity and autoimmunity by modulating IFN-beta production. THE JOURNAL OF EXPERIMENTAL MEDICINE 2009. [PMID: 19398754 DOI: 10.1084/jem.200815822715044] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Heme oxygenase-1 (HO-1) is a key cytoprotective, antioxidant, and antiinflammatory molecule. The pathophysiological functions of HO-1 have been associated with its enzymatic activities in heme catabolism. We have examined the immune functions of HO-1 by its conditional ablation in myeloid cells (HO-1(M-KO) mice). We demonstrate that myeloid HO-1 is required for the activation of interferon (IFN) regulatory factor (IRF) 3 after Toll-like receptor 3 or 4 stimulation, or viral infection. HO-1-deficient macrophages show reduced expression of IFN-beta and of primary IRF3 target genes encoding RANTES, IP-10 and MCP-1. In the presence of polyI:C, myeloid HO-1 knockout mice infected with Listeria monocytogenes, a model dependent on IFN-beta production, showed enhanced bacterial clearance and survival, whereas control mice succumbed to infection. Moreover, after induction of experimental autoimmune encephalomyelitis, mice with myeloid-specific HO-1 deficiency developed a higher incidence and an exacerbated, nonremitting clinical disease correlating with persistent activation of antigen-presenting cells, enhanced infiltration of Th17 cells, and a nonregressing myelin-specific T cell reactivity. Notably, these defects were rectified by exogenous administration of IFN-beta, confirming that HO-1 functions directly upstream of this critical immune pathway. These results uncover a novel direct function for myeloid HO-1 in the regulation of IFN-beta production, establishing HO-1 as a critical early mediator of the innate immune response.
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Affiliation(s)
- Sotiria Tzima
- Biomedical Sciences Research Center Alexander Fleming, Vari 166-72, Greece
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24
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Tzima S, Victoratos P, Kranidioti K, Alexiou M, Kollias G. Myeloid heme oxygenase-1 regulates innate immunity and autoimmunity by modulating IFN-beta production. ACTA ACUST UNITED AC 2009; 206:1167-79. [PMID: 19398754 PMCID: PMC2715044 DOI: 10.1084/jem.20081582] [Citation(s) in RCA: 153] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Heme oxygenase–1 (HO-1) is a key cytoprotective, antioxidant, and antiinflammatory molecule. The pathophysiological functions of HO-1 have been associated with its enzymatic activities in heme catabolism. We have examined the immune functions of HO-1 by its conditional ablation in myeloid cells (HO-1M-KO mice). We demonstrate that myeloid HO-1 is required for the activation of interferon (IFN) regulatory factor (IRF) 3 after Toll-like receptor 3 or 4 stimulation, or viral infection. HO-1–deficient macrophages show reduced expression of IFN-β and of primary IRF3 target genes encoding RANTES, IP-10 and MCP-1. In the presence of polyI:C, myeloid HO-1 knockout mice infected with Listeria monocytogenes, a model dependent on IFN-β production, showed enhanced bacterial clearance and survival, whereas control mice succumbed to infection. Moreover, after induction of experimental autoimmune encephalomyelitis, mice with myeloid-specific HO-1 deficiency developed a higher incidence and an exacerbated, nonremitting clinical disease correlating with persistent activation of antigen-presenting cells, enhanced infiltration of Th17 cells, and a nonregressing myelin-specific T cell reactivity. Notably, these defects were rectified by exogenous administration of IFN-β, confirming that HO-1 functions directly upstream of this critical immune pathway. These results uncover a novel direct function for myeloid HO-1 in the regulation of IFN-β production, establishing HO-1 as a critical early mediator of the innate immune response.
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Affiliation(s)
- Sotiria Tzima
- Biomedical Sciences Research Center Alexander Fleming, Vari 166-72, Greece
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25
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Martín-Saavedra FM, González-García C, Bravo B, Ballester S. Beta interferon restricts the inflammatory potential of CD4+ cells through the boost of the Th2 phenotype, the inhibition of Th17 response and the prevalence of naturally occurring T regulatory cells. Mol Immunol 2008; 45:4008-19. [DOI: 10.1016/j.molimm.2008.06.006] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2007] [Revised: 06/05/2008] [Accepted: 06/08/2008] [Indexed: 10/21/2022]
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26
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Fillatreau S, Gray D, Anderton SM. Not always the bad guys: B cells as regulators of autoimmune pathology. Nat Rev Immunol 2008; 8:391-7. [PMID: 18437156 DOI: 10.1038/nri2315] [Citation(s) in RCA: 212] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
When B cells react aggressively against self, the potential for pathology is extreme. It is therefore not surprising that B-cell depletion is seen as an attractive therapy in autoimmune diseases. However, B cells can also be essential for restraining unwanted autoaggressive T-cell responses. Recent advances have pointed to interleukin-10 (IL-10) production as a key component in B-cell-mediated immune regulation. In this Opinion article, we develop a hypothesis that triggering of Toll-like receptors controls the propensity of B cells for IL-10 production and immune suppression. According to this model, B cells can translate exposure to certain microbial infections into protection from chronic inflammatory diseases.
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Affiliation(s)
- Simon Fillatreau
- Simon Fillatreau is at the Immune regulation group, Deutsches Rheuma-ForschungsZentrum, Charitéplatz 1, 10117 Berlin, Germany
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27
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Bailey-Bucktrout SL, Caulkins SC, Goings G, Fischer JAA, Dzionek A, Miller SD. Cutting edge: central nervous system plasmacytoid dendritic cells regulate the severity of relapsing experimental autoimmune encephalomyelitis. THE JOURNAL OF IMMUNOLOGY 2008; 180:6457-61. [PMID: 18453561 DOI: 10.4049/jimmunol.180.10.6457] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Plasmacytoid dendritic cells (pDCs) have both stimulatory and regulatory effects on T cells. pDCs are a major CNS-infiltrating dendritic cell population during experimental autoimmune encephalomyelitis but, unlike myeloid dendritic cells, have a minor role in T cell activation and epitope spreading. We show that depletion of pDCs during either the acute or relapse phases of experimental autoimmune encephalomyelitis resulted in exacerbation of disease severity. pDC depletion significantly enhanced CNS but not peripheral CD4(+) T cell activation, as well as IL-17 and IFN-gamma production. Moreover, CNS pDCs suppressed CNS myeloid dendritic cell-driven production of IL-17, IFN-gamma, and IL-10 in an IDO-independent manner. The data demonstrate that pDCs play a critical regulatory role in negatively regulating pathogenic CNS CD4(+) T cell responses, highlighting a new role for pDCs in inflammatory autoimmune disease.
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Affiliation(s)
- Samantha L Bailey-Bucktrout
- Department of Microbiology-Immunology and the Interdepartmental Immunobiology Center, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
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28
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Lampropoulou V, Hoehlig K, Roch T, Neves P, Calderón Gómez E, Sweenie CH, Hao Y, Freitas AA, Steinhoff U, Anderton SM, Fillatreau S. TLR-activated B cells suppress T cell-mediated autoimmunity. THE JOURNAL OF IMMUNOLOGY 2008; 180:4763-73. [PMID: 18354200 DOI: 10.4049/jimmunol.180.7.4763] [Citation(s) in RCA: 336] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
TLR sense microbial infections, and control activation of immune responses. Dendritic cells, macrophages, and B lymphocytes express TLR and the TLR-signaling adaptor protein MyD88. The impact of TLR-activated B cells on T cell-mediated inflammation is unknown. In this study, we have used mice carrying B cell-restricted deficiencies in MyD88 or in distinct TLR to examine the impact of TLR-activated B cells on a T cell-mediated autoimmune disease, experimental autoimmune encephalomyelitis (EAE). We demonstrate that TLR-signaling in B cells suppresses inflammatory T cell responses (both Th1 and Th17), and stimulates recovery from EAE. Only certain TLR are required on B cells for resolution of EAE, and these are dispensable for disease initiation, indicating that a category of TLR agonists preferentially triggers a suppressive function in B cells and thereby limits autoimmune disease. The TLR agonists controlling the regulatory function of B cells are provided by components of Mycobacterium tuberculosis present in the adjuvant. Thus, MyD88 signaling in B cells antagonizes MyD88 signaling in other cells, which drives differentiation of Th17 cells and is required for induction of EAE. Altogether, our data indicate that B cells link recognition of microbial products via TLR to suppression of a T cell-mediated autoimmune disease.
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29
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Trebst C, Heine S, Lienenklaus S, Lindner M, Baumgärtner W, Weiss S, Stangel M. Lack of interferon-beta leads to accelerated remyelination in a toxic model of central nervous system demyelination. Acta Neuropathol 2007; 114:587-96. [PMID: 17940777 DOI: 10.1007/s00401-007-0300-z] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2007] [Revised: 09/18/2007] [Accepted: 09/18/2007] [Indexed: 11/26/2022]
Abstract
Interferon-beta (IFN-beta) is a pleiotropic cytokine that is known to modulate the immune response in multiple sclerosis (MS), an inflammatory demyelinating disease of the central nervous system (CNS). Spontaneous remyelination and repair mechanisms in MS are mostly insufficient and contribute to clinical disability. Here, we investigated whether IFN-beta has a potential in modifying the extent of de- and remyelination in a toxic model of CNS demyelination induced by the copper chelator cuprizone. IFN-beta deficient (k/o) mice showed an accelerated spontaneous remyelination. However, the amount of remyelination after 6 weeks did not differ between the two groups. Demyelination in IFN-beta k/o mice was paralleled by a diminished astrocytic and microglia response as compared with wildtype controls, whereas the accelerated remyelination was paralleled by an increased number of oligodendrocyte precursor cells (OPC) within the demyelinated lesion at the beginning of the remyelination phase. We hypothesize that the absence of IFN-beta leads to more efficient recruitment and proliferation of OPC already during demyelination, thus allowing early remyelination. These results demonstrate that IFN-beta is able to alter remyelination in the absence of an immune-mediated demyelination.
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Affiliation(s)
- Corinna Trebst
- Department of Neurology, Medical School Hannover, Carl-Neuberg-Str. 1, 30625, Hannover, Germany
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30
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Harkins RN, Szymanski P, Petry H, Brooks A, Qian HS, Schaefer C, Kretschmer PJ, Orme A, Wang P, Rubanyi GM, Hermiston TW. Regulated expression of the interferon-β gene in mice. Gene Ther 2007; 15:1-11. [PMID: 17637794 DOI: 10.1038/sj.gt.3302998] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A single plasmid regulated expression vector based upon a mifepristone-inducible two plasmid system, termed pBRES, has been constructed and tested in mice using murine interferon-b (mIFNb) as the transgene. The expression of mIFNb in the circulation was followed by measuring the systemic induction of IP-10, a validated biomarker for mIFNb in mice. Long-term, inducible expression of mIFNb was demonstrated following a single intramuscular (i.m.) injection of the pBRES mIFNb plasmid vector into the hind limb of mice. Induction of mIFNb expression was achieved by administration of the small molecule inducer, mifepristone (MFP). Plasmid DNA and mIFNb mRNA levels in the injected muscles correlated with mIFNb expression as monitored by IP-10 over a 3-month time period. Renewable transgene expression was achieved following repeat administration of the plasmid at 3 months following the first plasmid injection. A dose-dependent increase in expression was demonstrated by varying the amount of injected plasmid or the amount of the inducer administered to the mice. Finally, the pBRES plasmid expressing mIFNb under control of the inducer, MFP, was shown to be efficacious in a murine model of experimental allergic encephalomyelitis, supporting the feasibility of gene-based therapeutic approaches for treating diseases such as multiple sclerosis.
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Affiliation(s)
- R N Harkins
- Department of Gene Technologies, Berlex Biosciences, Richmond, CA, USA.
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31
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Martín-Saavedra FM, Flores N, Dorado B, Eguiluz C, Bravo B, García-Merino A, Ballester S. Beta-interferon unbalances the peripheral T cell proinflammatory response in experimental autoimmune encephalomyelitis. Mol Immunol 2007; 44:3597-607. [PMID: 17420051 DOI: 10.1016/j.molimm.2007.03.002] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2007] [Revised: 03/05/2007] [Accepted: 03/06/2007] [Indexed: 11/15/2022]
Abstract
Interferon beta (IFNbeta) is a widespread therapy for multiple sclerosis (MS). We have analyzed some critical features of the T cell activation process in lymph nodes after IFNbeta treatment of experimental autoimmune encephalomyelitis (EAE) in SJL mice. Prevention of clinical signs and drastic reduction of perivascular infiltrates in the central nervous system (CNS) were accompanied by alterations in nuclear DNA binding activity levels of NFkappaB and Stat6 transcription factors in lymph node cells (LNC). A decrease of active NFkappaB subunits in treated animals correlated with lower levels of the cytoplasmic phosphorylated form of IkappaBalpha. Results also showed that nuclear DNA binding activity of Stat6 was increased by IFNbeta treatment, as were the cytoplasmic levels of phosphorilated Stat6 (P-Stat6). These high levels of P-Stat6 in IFNbeta-treated animals were accompanied by an increase of IL-4 expression levels measured by real time PCR. In vitro experiments with the IL-4 producing clone D10.G4.1 indicates that the IFNbeta-mediated IL-4 induction is not an effect exclusive to MBP-reactive cells, and suggest that it could be mediated by mRNA stability enlargement. On the other hand, IFNbeta treatment of EAE produced no significant changes in peripheral IFNgamma expression and a striking decrease of IL-17. These findings suggest that the inhibition of NFkappaB activity, the increase of IL-4 expression and its signaling transduction, and the decrease of IL-17 may cooperate to some of the antiinflammatory effects of IFNbeta on EAE.
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Affiliation(s)
- Francisco M Martín-Saavedra
- Unidad de Regulación Génica, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Carretera Majadahonda-Pozuelo Km 2, Madrid, Spain
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32
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Touil T, Fitzgerald D, Zhang GX, Rostami A, Gran B. Cutting Edge: TLR3 stimulation suppresses experimental autoimmune encephalomyelitis by inducing endogenous IFN-beta. THE JOURNAL OF IMMUNOLOGY 2007; 177:7505-9. [PMID: 17114417 DOI: 10.4049/jimmunol.177.11.7505] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Experimental autoimmune encephalomyelitis is a well-characterized model of cell-mediated autoimmunity. TLRs expressed on APCs recognize microbial components and induce innate immune responses, leading to the elimination of invading infectious agents. Certain TLR agonists have been reported to have adjuvant properties in CNS autoimmune inflammatory demyelination. We report in this study that TLR3 stimulation by polyinosinic-polycytidylic acid, a double-stranded RNA analog, suppresses relapsing demyelination in a murine experimental autoimmune encephalomyelitis model. Disease suppression is associated with the induction of endogenous IFN-beta and the peripheral induction of the CC chemokine CCL2. These data indicate that a preferential activation of the MyD88-independent, type I IFN-inducing TLR pathway has immunoregulatory potential in this organ-specific autoimmune disease.
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Affiliation(s)
- Tarik Touil
- Department of Neurology, Thomas Jefferson University, Philadelphia, PA 19107, USA
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33
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Teige I, Liu Y, Issazadeh-Navikas S. IFN-beta inhibits T cell activation capacity of central nervous system APCs. THE JOURNAL OF IMMUNOLOGY 2006; 177:3542-53. [PMID: 16951313 DOI: 10.4049/jimmunol.177.6.3542] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
We have previously investigated the physiological effects of IFN-beta on chronic CNS inflammation and shown that IFN-beta(-/-) mice develop a more severe experimental autoimmune encephalomyelitis than their IFN-beta(+/-) littermates. This result was shown to be associated with a higher activation state of the glial cells and a higher T cell cytokine production in the CNS. Because this state suggested a down-regulatory effect of IFN-beta on CNS-specific APCs, these results were investigated further. We report that IFN-beta pretreatment of astrocytes and microglia (glial cells) indeed down-modulate their capacity to activate autoreactive Th1 cells. First, we investigated the intrinsic ability of glial cells as APCs and report that glial cells prevent autoreactive Th1 cells expansion while maintaining Ag-specific T cell effector functions. However, when the glial cells are treated with IFN-beta before coculture with T cells, the effector functions of T cells are impaired as IFN-gamma, TNF-alpha, and NO productions are decreased. Induction of the T cell activation marker, CD25 is also reduced. This suppression of T cell response is cell-cell dependent, but it is not dependent on a decrease in glial expression of MHC class II or costimulatory molecules. We propose that IFN-beta might exert its beneficial effects mainly by reducing the Ag-presenting capacity of CNS-specific APCs, which in turn inhibits the effector functions of encephalitogenic T cells. This affect is of importance because activation of encephalitogenic T cells within the CNS is a prerequisite for the development of a chronic progressive CNS inflammation.
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Affiliation(s)
- Ingrid Teige
- Neuroinflammation Unit, Section for Immunology, Institute for Experimental Medical Science, Lund University, Lund, Sweden
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34
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Jaini R, Hannaman D, Johnson JM, Bernard RM, Altuntas CZ, Delasalas MM, Kesaraju P, Luxembourg A, Evans CF, Tuohy VK. Gene-Based Intramuscular Interferon-β Therapy for Experimental Autoimmune Encephalomyelitis. Mol Ther 2006; 14:416-22. [PMID: 16782409 DOI: 10.1016/j.ymthe.2006.04.009] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2006] [Revised: 04/11/2006] [Accepted: 04/20/2006] [Indexed: 11/19/2022] Open
Abstract
In contrast to serial injections of recombinant interferon-beta (IFN-beta) for long-term therapy of multiple sclerosis (MS), prolonged systemic delivery of proteins derived through in vivo gene transfer may provide a more clinically relevant alternative. Here we compare the therapeutic efficacies of electroporation (EP)-mediated intramuscular IFN-beta gene transfer with repeated alternate-day injections of recombinant IFN-beta after the onset of relapsing-remitting experimental autoimmune encephalomyelitis (EAE), an animal model widely used in MS research. We show for the first time that a single EP-mediated intramuscular administration of 20 microg of an IFN-beta-expressing plasmid provides long-term expression of interferon-inducible genes and is therapeutic in ongoing established EAE. The achieved therapeutic effects of IFN-beta gene delivery were comparable to an 8-week regimen of 10,000 IU rIFN-beta injected every other day and involved a significant inhibition of disease progression and a significant reduction of EAE relapses compared to untreated or null-vector-treated mice. Our results indicate the viability of a convenient and effective gene-based alternative for long-term IFN-beta protein therapy in MS.
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Affiliation(s)
- Ritika Jaini
- Department of Immunology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
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35
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Schaefer C, Hidalgo TR, Cashion L, Petry H, Brooks A, Szymanski P, Qian HS, Gross C, Wang P, Liu P, Goldman C, Rubanyi GM, Harkins RN. Gene-based delivery of IFN-beta is efficacious in a murine model of experimental allergic encephalomyelitis. J Interferon Cytokine Res 2006; 26:449-54. [PMID: 16800783 DOI: 10.1089/jir.2006.26.449] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Experimental allergic encephalomyelitis (EAE) is a model of central nervous system (CNS) inflammation that follows immunization with certain CNS antigens. The course and clinical manifestations of EAE are similar to those of multiple sclerosis (MS) in humans; therefore, EAE has become an accepted animal model to study MS. The purpose of this study was to demonstrate that systemic expression of murine interferon-beta (IFN-beta) (MuIFN-beta), following intramuscular (i.m.) delivery of plasmid DNA encoding MuIFN-beta to the hind limb of mice, is effective in reducing the clinical manifestations of disease in a model of EAE. The results of the study demonstrate that gene-based delivery of MuIFN-beta caused significantly decreased clinical scores compared with delivery of the null vector. A single injection of the MuIFN-beta plasmid was as effective in reducing the severity of the disease as an every other day injection of MuIFN-beta protein.
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Affiliation(s)
- Caralee Schaefer
- Department of Pharmacology, Berlex Biosciences, Richmond, CA 94804, USA
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36
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Cooper D, Mester JC, Guo M, Nasar F, Souza V, Dispoto S, Sidhu M, Hagen M, Eldridge JH, Natuk RJ, Pride MW. Epitope mapping of full-length glycoprotein D from HSV-2 reveals a novel CD4+ CTL epitope located at the transmembrane-cytoplasmic junction. Cell Immunol 2006; 239:113-20. [PMID: 16762332 DOI: 10.1016/j.cellimm.2006.04.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2006] [Revised: 04/28/2006] [Accepted: 04/28/2006] [Indexed: 11/19/2022]
Abstract
The glycoprotein D of HSV-2 (gD2) is currently a leading candidate vaccine target for genital herpes vaccines as both cellular and humoral responses can be generated against it. However, little is known about how vaccine composition will affect T cell epitope selection. A panel of 15-mer peptides (with 11 amino acid overlap) spanning full-length gD2 was used to investigate the fine specificity of T cell responses to gD2 as well as the role of vaccine composition on epitope selection. Spleen cells from BALB/c mice (H-2(d)) immunized with gD2, formulated with or without AlPO(4) and/or IL-12, were stimulated in vitro with overlapping gD2 peptides. Cellular responses (lymphoproliferation and IFN-gamma expression) were mapped to four epitopes within the gD2 molecule: gD2(49-63), gD2(105-119), gD2(245-259), and gD2(333-347). CTL analysis of these four epitopes indicated that not all of them could serve as a CTL epitope. Mice immunized with gD2 expressed from a viral vector mounted CTL responses primarily to one epitope located in the extracellular domain of gD2 (gD2(245-259)). More importantly, mice immunized with gD2 co-administered with IL-12 mounted CTL responses to an additional epitope located at the transmembrane-cytoplasmic junction of gD2 (gD2(333-347)). The location of this novel epitope emphasizes the benefit of using full-length versions of glycoproteins when designing vaccine components.
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Affiliation(s)
- David Cooper
- Department of Vaccines Discovery Research, Wyeth Research, Pearl River, NY 10965, USA.
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37
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Runström A, Leanderson T, Ohlsson L, Axelsson B. Inhibition of the development of chronic experimental autoimmune encephalomyelitis by laquinimod (ABR-215062) in IFN-beta k.o. and wild type mice. J Neuroimmunol 2006; 173:69-78. [PMID: 16472873 DOI: 10.1016/j.jneuroim.2005.11.023] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2005] [Revised: 11/28/2005] [Accepted: 11/28/2005] [Indexed: 10/25/2022]
Abstract
Laquinimod is a novel oral immunomodulatory substance, which is currently developed for the treatment of multiple sclerosis (MS). The ability of laquinimod to inhibit disease development was investigated in chronic experimental autoimmune encephalomyelitis (chEAE) in IFN-beta k.o. mice and wild type mice. Laquinimod was shown to inhibit both disease development and histopathological changes in the CNS. Furthermore, laquinimod was found to be independent of endogenous IFN-beta for its effect in chEAE. When laquinimod was combined with exogenous IFN-beta, a synergistic disease inhibitory effect was seen. These findings using laquinimod in preclinical disease models for MS emphasize the potential of laquinimod in the future treatment of MS also in patients that do not respond to IFN-beta monotherapy. Furthermore, the results indicate that laquinimod may favourably be combined with IFN-beta.
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38
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Schwarting A, Paul K, Tschirner S, Menke J, Hansen T, Brenner W, Kelley VR, Relle M, Galle PR. Interferon-β: A Therapeutic for Autoimmune Lupus in MRL-Faslpr Mice. J Am Soc Nephrol 2005; 16:3264-72. [PMID: 16221871 DOI: 10.1681/asn.2004111014] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Type I interferons are associated with lupus. Genes that are regulated by IFN-alpha are upregulated in pediatric lupus patients. Gene deletion of the IFN-alpha/beta receptor in experimental lupus-like NZB mice results in reduced disease activity. Conversely, IFN-beta is a well-established treatment in multiple sclerosis, another autoimmune disease. For determining whether IFN-beta treatment is harmful or beneficial in lupus, MRL-Fas(lpr) mice were injected with this type I IFN. Treatment was initiated in MRL-Fas(lpr) mice with mild and advanced disease. IFN-beta was highly effective in prolonging survival and ameliorating the clinical (renal function, proteinuria, splenomegaly, and skin lesions), serologic (autoantibodies and cytokines), and histologic parameters of the lupus-like disease in mice that had mild and advanced disease. Several underlying mechanisms of IFN-beta therapy involving cellular (decreased T cell proliferation and infiltration of leukocytes into the kidney) and humoral (decrease in IgG3 isotypes) immune responses and a reduction in nephrogenic cytokines were identified. In conclusion, IFN-beta treatment of lupus nephritis in MRL-Fas(lpr) mice is remarkably beneficial and suggests that IFN-beta may be an appealing therapeutic candidate for subtypes of human lupus.
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Affiliation(s)
- Andreas Schwarting
- First Department of Medicine, Johannes-Gutenberg University of Mainz, Langenbeckstrasse 1, Mainz 55131, Germany.
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39
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Abstract
Multiple sclerosis (MS) is both a complex and chronic neurological disease of the CNS. This poses unique challenges for drug discovery in terms of delineating specific targets related to disease mechanisms and developing safe and effective molecules for clinical application. Preclinical animal models of MS provide the necessary test bed for evaluating the effects of novel therapeutic strategies. Because the clinical manifestations and pathological consequences of disease vary dramatically from individual to individual, as well as treatment response to existing therapies, this creates a significant research endeavor in terms of translating preclinical methodologies to the clinical domain. Potentially exciting treatments have emerged in the form of natalizumab (Tysabri), an alpha4 integrin antagonist, and more recently FTY720, a sphinogosine-1 phosphate receptor modulator, providing a compelling proof-of-principle from bench to bedside. However, further research is required to discharge safety concerns associated with these therapeutic avenues. Future prospects in the guise of disease-modifying therapies that target the inflammatory and neurodegenerative components of disease have come to the forefront of preclinical research with the sole aim of reducing the underlying irreversible progressive disability of MS. Significant progress with novel therapies will be made by implementing biomarker strategies that extrapolate robustly from animal models to the divergent patient populations of MS. The future therapeutic options for MS will depend on improvements in understanding the precise factors involved in disease onset and progression and subsequently the development of oral therapeutics that translate sustained benefit from the preclinical context into clinical reality.
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Affiliation(s)
- David J Virley
- Neurology and GI Centre of Excellence for Drug Discovery, GlaxoSmithKline Pharmaceuticals, Harlow, Essex CM19 5AW, United Kingdom.
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40
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Lionel A, de Seze J, Didier L, Sandrine FN, Sylvain D, Patrick V, Lionel P. Evolution of self-reactive IgG antibody repertoires in patients with relapsing-remitting multiple sclerosis. Immunol Lett 2005; 97:55-62. [PMID: 15626476 DOI: 10.1016/j.imlet.2004.09.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2004] [Revised: 09/06/2004] [Accepted: 09/23/2004] [Indexed: 10/26/2022]
Abstract
We have previously demonstrated a distortion of self-reactive IgG antibody repertoires in patients with multiple sclerosis (MS) compared to controls, by immunoblotting assays, using human brain homogenates. The analysis of the immune profiles against human brain antigens allowed us to distinguish MS patients, and to associate a particular pattern of reactivity for each clinical form of MS. The aim of the present study was to evaluate the evolution of such patterns in patients with relapsing-remitting MS (RRMS). In a first step, we confirmed, by western blotting using human brains as source of antigens, the existence of specific repertoires of IgG reactivity in whole serum collected from healthy subjects (n = 32) and from untreated patients with RRMS (n = 56). In a second step, the evaluation of patterns was performed at baseline and 1 year later in untreated RRMS patients (n = 15), and in RRMS patients treated with IFN-beta (n = 41). In both groups, little change in IgG reactivity in whole serum was found. However, a higher degree of stability was noted in treated versus untreated patients (P < 0.01). Our results have showed a specific and relatively stable pattern of reactivity for each RRMS individual tested against brain antigens even after a 1-year treatment prevailing in treated patients suggesting that IFN-beta could stabilize IgG antibody repertoires.
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Affiliation(s)
- Almeras Lionel
- Laboratoire d'immunologie EA2686, Faculté de Médecine, 1, Place de Verdun, 59045 Lille Cedex, France
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41
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Abstract
Significant advances in magnetic resonance imaging (MRI) technology and treatment of multiple sclerosis (MS) have been made during the past decade. These advances have revealed evidence of profound heterogeneity in MS. There is a clear need to revisit the key issues in MS pathogenesis and treatment strategies, taking new data into consideration. This paper provides an overview of recent progress in MS research, including (a) a review of clinical, pathologic, and immunologic aspects of MS, (b) a discussion of the mechanism of action of currently available disease-modifying drugs for MS, (c) an account of the role of MRI in clinical management and clinical trials in MS, and (d) an overview of some emerging treatments for MS.
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Affiliation(s)
- Jingwu Zhang
- Baylor-Methodist Multiple Sclerosis Center, Department of Neurology, Baylor College of Medicine, Houston, Texas, USA.
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42
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Al-Khatib K, Williams BRG, Silverman RH, Halford W, Carr DJJ. Distinctive roles for 2',5'-oligoadenylate synthetases and double-stranded RNA-dependent protein kinase R in the in vivo antiviral effect of an adenoviral vector expressing murine IFN-beta. THE JOURNAL OF IMMUNOLOGY 2004; 172:5638-47. [PMID: 15100308 PMCID: PMC4060620 DOI: 10.4049/jimmunol.172.9.5638] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
To evaluate the anti-HSV-1 mechanisms of murine IFN-beta in ocular infection, mice were transduced with an adenoviral vector expressing murine IFN-beta (Ad:IFN-beta). Ocular transduction with Ad:IFN-beta resulted in enhanced survival following infection with HSV-1. The protective effect was associated with a reduction in 1) viral titer, 2) viral gene expression, 3) IFN-gamma levels, and 4) the percentage of CD8(+) T lymphocyte and NK cell infiltration in infected tissue. Expression of IFN-beta resulted in an elevation of the IFN-induced antiviral gene 2',5'-oligoadenylate synthetase (OAS1a) but not dsRNA-dependent protein kinase R (PKR) in the cornea and trigeminal ganglion (TG). Mice deficient in the downstream effector molecule of the OAS pathway, RNase L, were no more sensitive to ocular HSV-1 compared with wild-type controls in the TG based on measurements of viral titer. However, the efficacy of Ad:IFN-beta was transiently lost in the eyes of RNase L mice. By comparison, PKR-deficient mice were more susceptible to ocular HSV-1 infection, and the antiviral efficacy following transduction with Ad:IFN-beta was significantly diminished in the eye and TG. These results suggest that PKR is central in controlling ocular HSV-1 infection in the absence of exogenous IFN, whereas the OAS pathway appears to respond to exogenous IFN, contributing to the establishment of an antiviral environment in a tissue-restricted manner.
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MESH Headings
- 2',5'-Oligoadenylate Synthetase/physiology
- Adenoviridae/genetics
- Adenoviridae/immunology
- Adjuvants, Immunologic/administration & dosage
- Adjuvants, Immunologic/genetics
- Adjuvants, Immunologic/physiology
- Administration, Topical
- Animals
- Antiviral Agents/administration & dosage
- Antiviral Agents/pharmacology
- CD8-Positive T-Lymphocytes/immunology
- CD8-Positive T-Lymphocytes/pathology
- Cell Migration Inhibition
- Cells, Cultured
- Female
- Genetic Vectors
- Green Fluorescent Proteins
- Herpesvirus 1, Human/immunology
- Interferon-beta/administration & dosage
- Interferon-beta/biosynthesis
- Interferon-beta/genetics
- Interferon-gamma/antagonists & inhibitors
- Interferon-gamma/biosynthesis
- Keratitis, Herpetic/enzymology
- Keratitis, Herpetic/immunology
- Keratitis, Herpetic/mortality
- Keratitis, Herpetic/therapy
- Killer Cells, Natural/immunology
- Killer Cells, Natural/pathology
- Luminescent Proteins/administration & dosage
- Luminescent Proteins/biosynthesis
- Luminescent Proteins/genetics
- Mice
- Mice, Inbred C57BL
- Mice, Inbred ICR
- Mice, Knockout
- Survival Analysis
- Trigeminal Ganglion/enzymology
- Trigeminal Ganglion/immunology
- Trigeminal Ganglion/pathology
- Virus Replication/genetics
- Virus Replication/immunology
- eIF-2 Kinase/deficiency
- eIF-2 Kinase/genetics
- eIF-2 Kinase/physiology
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Affiliation(s)
- Khaldun Al-Khatib
- Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
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43
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Zhang GX, Yu S, Gran B, Li J, Calida D, Ventura E, Chen X, Rostami A. T cell and antibody responses in remitting–relapsing experimental autoimmune encephalomyelitis in (C57BL/6×SJL) F1 mice. J Neuroimmunol 2004; 148:1-10. [PMID: 14975581 DOI: 10.1016/j.jneuroim.2003.10.057] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2003] [Revised: 09/03/2003] [Accepted: 10/16/2003] [Indexed: 12/25/2022]
Abstract
To characterize T cell and antibody responses in remitting-relapsing experimental autoimmune encephalomyelitis (RR-EAE), we compared myelin oligodendrocyte glycoprotein (MOG)-induced RR-EAE in C57BL/6 (B6) x SJL (F1) mice and chronic-progressive EAE (CP-EAE) in B6 mice at week 8 p.i. when clinical scores were comparable. Although these two strains exhibited similar inflammation/demyelination pattern and MOG-induced T cell responses, RR-EAE mice produced significantly higher levels of anti-MOG IgG1/IgG2a antibodies. Further, lymphocytes of RR-EAE mice proliferated vigorously to the secondary epitope myelin basic protein (MBP) 1-11. These results support a potential involvement of anti-MOG antibodies and epitope spreading in T cell responses in the development of MOG-induced RR-EAE model.
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MESH Headings
- Analysis of Variance
- Animals
- Antibodies/immunology
- Cells, Cultured
- Cytokines/metabolism
- Disease Models, Animal
- Encephalomyelitis, Autoimmune, Experimental/etiology
- Encephalomyelitis, Autoimmune, Experimental/immunology
- Encephalomyelitis, Autoimmune, Experimental/pathology
- Enzyme-Linked Immunosorbent Assay/methods
- Flow Cytometry/methods
- Glycoproteins/immunology
- Histological Techniques
- Immunization/methods
- Immunoglobulin G/blood
- Lymphocyte Activation
- Mice
- Mice, Inbred Strains
- Multiple Sclerosis, Chronic Progressive/etiology
- Multiple Sclerosis, Chronic Progressive/immunology
- Multiple Sclerosis, Chronic Progressive/pathology
- Multiple Sclerosis, Relapsing-Remitting/etiology
- Multiple Sclerosis, Relapsing-Remitting/immunology
- Multiple Sclerosis, Relapsing-Remitting/pathology
- Myelin Basic Protein/immunology
- Myelin Basic Protein/toxicity
- Myelin Proteolipid Protein
- Myelin-Oligodendrocyte Glycoprotein
- Peptide Fragments/immunology
- Peptide Fragments/toxicity
- Spinal Cord/pathology
- T-Lymphocytes/immunology
- Time Factors
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Affiliation(s)
- Guang-Xian Zhang
- Department of Neurology, Thomas Jefferson University, 1025 and Walnut Street, Suite 310, Philadelphia, PA 19107-5083, USA
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44
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Nagai T, Devergne O, Mueller TF, Perkins DL, van Seventer JM, van Seventer GA. Timing of IFN-beta exposure during human dendritic cell maturation and naive Th cell stimulation has contrasting effects on Th1 subset generation: a role for IFN-beta-mediated regulation of IL-12 family cytokines and IL-18 in naive Th cell differentiation. THE JOURNAL OF IMMUNOLOGY 2004; 171:5233-43. [PMID: 14607924 DOI: 10.4049/jimmunol.171.10.5233] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Type I IFNs, IFN-alpha and IFN-beta, are early effectors of innate immune responses against microbes that can also regulate subsequent adaptive immunity by promoting antimicrobial Th1-type responses. In contrast, the ability of IFN-beta to inhibit autoimmune Th1 responses is thought to account for some of the beneficial effects of IFN-beta therapy in the treatment of relapsing remitting multiple sclerosis. To understand the basis of the paradoxical effects of IFN-beta on the expression of Th1-type immune responses, we developed an in vitro model of monocyte-derived dendritic cell (DC)-dependent, human naive Th cell differentiation, in which one can observe both positive and negative effects of IFN-beta on the generation of Th1 cells. In this model we found that the timing of IFN-beta exposure determines whether IFN-beta will have a positive or a negative effect on naive Th cell differentiation into Th1 cells. Specifically, the presence of IFN-beta during TNF-alpha-induced DC maturation strongly augments the capacity of DC to promote the generation of IFN-gamma-secreting Th1 cells. In contrast, exposure to IFN-beta during mature DC-mediated primary stimulation of naive Th cells has the opposite effect, in that it inhibits Th1 cell polarization and promotes the generation of an IL-10-secreting T cell subset. Studies with blocking mAbs and recombinant cytokines indicate that the mechanism by which IFN-beta mediates these contrasting effects on Th1 cell generation is at least in part by differentially regulating DC expression of IL-12 family cytokines (IL-12 and/or IL-23, and IL-27) and IL-18.
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Affiliation(s)
- Taro Nagai
- Department of Environmental Health, Boston University School of Public Health, Boston, MA 02118, USA
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45
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Veldhuis WB, Derksen JW, Floris S, Van Der Meide PH, De Vries HE, Schepers J, Vos IMP, Dijkstra CD, Kappelle LJ, Nicolay K, Bär PR. Interferon-beta blocks infiltration of inflammatory cells and reduces infarct volume after ischemic stroke in the rat. J Cereb Blood Flow Metab 2003; 23:1029-39. [PMID: 12973019 DOI: 10.1097/01.wcb.0000080703.47016.b6] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The inflammatory response that exacerbates cerebral injury after ischemia is an attractive therapeutic target: it progresses over days and strongly contributes to worsening of the neurologic outcome. The authors show that, after transient ischemic injury to the rat brain, systemic application of interferon-beta (IFN-beta), a cytokine with antiinflammatory properties, attenuated the development of brain infarction. Serial magnetic resonance imaging (MRI) showed that IFN-beta treatment reduced lesion volume on diffusion-weighted MRI by 70% (P < 0.01) at 1 day after stroke. IFN-beta attenuated the leakage of contrast agent through the blood-brain barrier (P < 0.005), indicating a better-preserved blood-brain barrier integrity. Both control and IFN-beta-treated animals showed a similar degree of relative hyperperfusion of the lesioned hemisphere, indicating that neuroprotection by IFN-beta was not mediated by improved cerebral perfusion as assessed 24 hours after stroke onset. IFN-beta treatment resulted in an 85% reduction (P < 0.0001) in infarct volume 3 weeks later, as determined from T2-weighted MRI and confirmed by histology. This effect was achieved even when treatment was started 6 hours after stroke onset. Quantitative immunohistochemistry at 24 hours after stroke onset showed that IFN-beta almost completely prevented the infiltration of neutrophils and monocytes into the brain. Gelatinase zymography showed that this effect was associated with a decrease in matrix metalloproteinase-9 expression. In conclusion, treatment with the antiinflammatory cytokine IFN-beta affords significant neuroprotection against ischemia/reperfusion injury, and within a relatively long treatment window. Because IFN-beta has been approved for clinical use, it may be rapidly tested in a clinical trial for its efficacy against human stroke.
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Affiliation(s)
- Wouter B Veldhuis
- Image Sciences Institute, University Medical Center Utrecht, Utrecht, The Netherlands.
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Willenborg DO, Staykova MA. Cytokines in the pathogenesis and therapy of autoimmune encephalomyelitis and multiple sclerosis. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2003; 520:96-119. [PMID: 12613575 DOI: 10.1007/978-1-4615-0171-8_7] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Abstract
Interleukin (IL)-10 is an important immunoregulatory cytokine produced by many cell populations. Its main biological function seems to be the limitation and termination of inflammatory responses and the regulation of differentiation and proliferation of several immune cells such as T cells, B cells, natural killer cells, antigen-presenting cells, mast cells, and granulocytes. However, very recent data suggest IL-10 also mediates immunostimulatory properties that help to eliminate infectious and noninfectious particles with limited inflammation. Numerous investigations, including expression analyses in patients, in vitro and animal experiments suggest a major impact of IL-10 in inflammatory, malignant, and autoimmune diseases. So IL-10 overexpression was found in certain tumors as melanoma and several lymphomas and is considered to promote further tumor development. Systemic IL-10 release is a powerful tool of the central nervous system to prevent hyperinflammatory processes by activation of the neuro-endocrine axis following acute stress reactions. In contrast, a relative IL-10 deficiency has been observed and is regarded to be of pathophysiological relevance in certain inflammatory disorders characterized by a type 1 cytokine pattern such as psoriasis. Recombinant human IL-10 has been produced and is currently being tested in clinical trials. This includes rheumatoid arthritis, inflammatory bowel disease, psoriasis, organ transplantation, and chronic hepatitis C. The results are heterogeneous. They give new insight into the immunobiology of IL-10 and suggest that the IL-10/IL-10 receptor system may become a new therapeutic target.
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Affiliation(s)
- K Asadullah
- Head of Corporate Research Business Area Dermatology, Schering AG, D-13342 Berlin, Germany.
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Teige I, Treschow A, Teige A, Mattsson R, Navikas V, Leanderson T, Holmdahl R, Issazadeh-Navikas S. IFN-beta gene deletion leads to augmented and chronic demyelinating experimental autoimmune encephalomyelitis. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2003; 170:4776-84. [PMID: 12707359 DOI: 10.4049/jimmunol.170.9.4776] [Citation(s) in RCA: 171] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Since the basic mechanisms behind the beneficial effects of IFN-beta in multiple sclerosis (MS) patients are still obscure, here we have investigated the effects of IFN-beta gene disruption on the commonly used animal model for MS, experimental autoimmune encephalomyelitis (EAE). We show that IFN-beta knockout (KO) mice are more susceptible to EAE than their wild-type (wt) littermates; they develop more severe and chronic neurological symptoms with more extensive CNS inflammation and demyelination. However, there was no discrepancy observed between wt and KO mice regarding the capacity of T cells to proliferate or produce IFN-gamma in response to recall Ag. Consequently, we addressed the effect of IFN-beta on encephalitogenic T cell development and the disease initiation phase by passive transfer of autoreactive T cells from KO or wt littermates to both groups of mice. Interestingly, IFN-beta KO mice acquired a higher incidence and augmented EAE regardless of the source of T cells. This shows that the anti-inflammatory effect of endogenous IFN-beta is predominantly exerted on the effector phase of the disease. Histopathological investigations of CNS in the effector phase revealed an extensive microglia activation and TNF-alpha production in IFN-beta KO mice; this was virtually absent in wt littermates. This coincided with an increase in effector functions of T cells in IFN-beta KO mice, as measured by IFN-gamma and IL-4 production. We suggest that lack of endogenous IFN-beta in CNS leads to augmented microglia activation, resulting in a sustained inflammation, cytokine production, and tissue damage with consequent chronic neurological deficits.
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MESH Headings
- Adjuvants, Immunologic/genetics
- Adoptive Transfer
- Animals
- Autoantibodies/biosynthesis
- Autoantigens/immunology
- Cells, Cultured
- Chronic Disease
- Encephalomyelitis, Autoimmune, Experimental/epidemiology
- Encephalomyelitis, Autoimmune, Experimental/genetics
- Encephalomyelitis, Autoimmune, Experimental/immunology
- Encephalomyelitis, Autoimmune, Experimental/pathology
- Gene Deletion
- Genetic Predisposition to Disease
- Immunophenotyping
- Incidence
- Inflammation/genetics
- Inflammation/immunology
- Interferon-beta/biosynthesis
- Interferon-beta/deficiency
- Interferon-beta/genetics
- Macrophage Activation/genetics
- Macrophage Activation/immunology
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Myelin Basic Protein/immunology
- Myelin Sheath/pathology
- Peptide Fragments/immunology
- Severity of Illness Index
- T-Lymphocyte Subsets/immunology
- T-Lymphocyte Subsets/transplantation
- Th1 Cells/immunology
- Th1 Cells/metabolism
- Th2 Cells/immunology
- Th2 Cells/metabolism
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Affiliation(s)
- Ingrid Teige
- Section for Medical Inflammation Research, Department of Cell and Molecular Biology, University of Lund, Lund, Sweden
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Abstract
Treatment of neurodegenerative diseases, such as Alzheimer's disease, multiple sclerosis, Parkinson's disease and amyotrophic lateral sclerosis (ALS), represents a major challenge for the pharmaceutical industry. These disorders have common and unique molecular pathological characteristics that result in serious reductions in nervous-system functionality. Key to developing novel and efficacious therapeutics is the discovery of new gene targets. Genomic, proteomics and bioinformatic analyses are identifying vast amounts of genes whose expression is associated with the pathology of a specific disease. Extensive validation studies performed in parallel with drug development are crucial for the selection of appropriate target genes. This review outlines some of the current progress in gene discovery for neurodegenerative disease.
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Zhang J, Hutton G, Zang Y. A comparison of the mechanisms of action of interferon beta and glatiramer acetate in the treatment of multiple sclerosis. Clin Ther 2002; 24:1998-2021. [PMID: 12581542 DOI: 10.1016/s0149-2918(02)80094-7] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
BACKGROUND The development of immunomodulatory agents has represented a major advance in the treatment of multiple sclerosis (MS). To date, immunomodulatory agents approved for the treatment of relapsing MS in the United States include 3 forms of recombinant interferon (IFN) beta (2 formulations of IFN beta-1a and 1 of IFN beta-1b) and synthetic glatiramer acetate (GA). Recognition of how these agents work to regulate the immune system may lead to a better understanding of disease mechanisms, as well as to development of more effective therapies or combinations of therapy. OBJECTIVE This article reviews the potential mechanisms of action of IFN beta products and GA in the context of their regulatory effects on autoimmune components that may be of importance in MS. METHODS MEDLINE and Current Contents/Clinical Medicine were searched for articles published in English from 1993 to the present using the search terms interferon beta, glatiramer acetate, and multiple sclerosis. RESULTS IFN beta products affect the disease process in MS through multiple potential mechanisms of action, including antiviral, antiproliferative, and anti-inflammatory effects. The mechanisms of action of GA are less clear, but may involve immune regulation induced by a gradual shift of T-cell phenotype from proinflammatory (type 1 T-helper cells) to anti-inflammatory (type 2 T-helper cells) and interference with antigen presentation. CONCLUSION Understanding the mechanisms of action of IFN beta products and GA provides important insights into the disease processes involved in MS.
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Affiliation(s)
- Jingwu Zhang
- Department of Neurology, Baylor College of Medicine, Houston, Texas 77030, USA.
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