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Stage-Specific Role of Interferon-Gamma in Experimental Autoimmune Encephalomyelitis and Multiple Sclerosis

Gabriel Arellano, Payton A. Ottum, Lilian I. Reyes and 2 more

Frontiers in Immunology · 2015 · Review

doi:10.3389/fimmu.2015.00492

Abstract

The role of interferon (IFN)-γ in multiple sclerosis (MS) and its animal model, experimental autoimmune encephalomyelitis (EAE), has remained as an enigmatic paradox for more than 30 years. Several studies attribute this cytokine a prominent proinflammatory and pathogenic function in these pathologies. However, accumulating evidence shows that IFN-γ also plays a protective role inducing regulatory cell activity and modulating the effector T cell response. Several innate and adaptive immune cells also develop opposite functions strongly associated with the production of IFN-γ in EAE. Even the suppressive activity of different types of regulatory cells is dependent on IFN-γ. Interestingly, recent data supports a stage-specific participation of IFN-γ in EAE providing a plausible explanation for previous conflicting results. In this review, we will summarize and discuss such literature, emphasizing the protective role of IFN-γ on immune cells. These findings are fundamental to understand the complex role of IFN-γ in the pathogenesis of these diseases and can provide basis for potential stage-specific therapy for MS targeting IFN-γ-signaling or IFN-γ-producing immune cells.

Full text

From PubMed Central, U.S. National Library of Medicine, as current on Oct 23, 2026. Paragraph numbers are ours, so an answer can point at one.

Introduction

Interferon (IFN)-γ is the only type II IFN family member. It is secreted by activated immune cells, mainly T and natural killer (NK) cells, but also B cells, NKT cells, and professional antigen presenting cells (APC). IFN-γ binds to a heterodimeric receptor, IFNGR, expressed ubiquitously on almost all cell types. Given its pleiotropic functions, IFN-γ plays a pivotal role in orchestrating immune system homeostasis. Historically, IFN-γ production has been considered the hallmark of T helper (Th)1 cells driving inflammation and autoimmunity, such as multiple sclerosis (MS). MS is an inflammatory and demyelinating disorder of the central nervous system (CNS) and is the leading cause of non-traumatic neurological disability in young adults. According to the clinical course, MS can be classified in different types: relapsing-remitting disease (RRMS), consisting of acute recurrent attacks followed by a variable degree of recovery, and progressive forms characterized by chronic and irreversible neurological disability.

To date, experimental autoimmune encephalomyelitis (EAE) remains as the animal model most widely used to study the immunopathological mechanisms and therapeutic approaches to MS. EAE is induced by immunization with myelin-derived antigens in adjuvant or by the adoptive transfer of activated myelin-specific T cells into syngeneic naive hosts. First, an initiation/inductive phase occurs, where innate and adaptive immune cells are antigen stimulated in the periphery. That is followed by the effector phase characterized by an acute immune cell infiltration into the CNS, and a later chronic phase of inflammation and axonal damage.

Discrepant results have been reported in relation to the role of IFN-γ in EAE and MS. Factors such as dose, site specificity, and timing of action as well as interaction with other cytokines and cells can determine the net effect of IFN-γ (,, Ottum et al., in preparation). Recent evidence supports a, not mutually exclusive, stage-specific role of IFN-γ in EAE providing an explanation to these controversial results and a model whereby this cytokine can both promote and limit the development of these pathologies. In this same Research Topic, we have reviewed the opposing roles of IFN-γ on CNS-resident cells in EAE and MS (Ottum et al., in preparation). Here, we will review the evidence on IFN-γ’s dual role in the cells of the immune system in these same pathologies.

Two-Faced Role of IFN-γ in EAE and MS

Initially, a positive association between increased levels of IFN-γ and demyelinating lesions in the CNS in MS and EAE attributed this cytokine a pathological role. In mice, passive immunization of healthy animals with encephalitogenic Th1 lymphocytes producing IFN-γ was sufficiently capable of inducing EAE. Besides, mice deficient in T-bet, a transcription factor that drives Th1 differentiation, were protected from developing EAE. The proinflammatory effects of IFN-γ were confirmed in a pilot clinical study showing that seven of eighteen RRMS patients treated with IFN-γ exhibited symptom exacerbations. Consistently, secondary progressive MS patients (SPMS) treated with antibodies against IFN-γ exhibited slightly reduced clinical symptoms.

However, subsequent studies have challenged the notion that IFN-γ is pathogenic, and there is accumulating evidence proposing a protective role for IFN-γ in EAE and MS. Systemic or intraventricular injection of IFN-γ in EAE mice reduced the severity of disease symptoms, morbidity, and mortality, and systemic IFN-γ treatment in chronic-relapsing EAE (CREAE) significantly delayed the appearance of relapses. Likewise, anti-IFN-γ therapy exacerbated EAE symptoms and made a mice strain resistant to EAE susceptible to developing disease. These results have been corroborated using animals deficient in the IFN-γ gene, which showed increased incidence of EAE, earlier disease onset and more severe symptoms compared with control mice. Even more, animals lacking IFNGR developed EAE with higher susceptibility, severity, and lethality. Passive transfer of encephalitogenic splenic cells from EAE-induced IFNGR-deficient mice into either wild-type (WT) or IFNGR-deficient recipient mice led to the development of EAE, but only WT mice recovered from illness. Interestingly, in tumor necrosis factor (TNF)-α receptor-deficient mice, a higher frequency of Th1 cells and enhanced mRNA expression of IFN-γ in the CNS was associated with a milder EAE.

Finally, in the marmoset EAE model, administration of human IFN-γ did not aggravate clinical symptoms, and by contrast, there was a trend to delay the appearance of the neurological episodes associated with less inflammation and demyelination during the EAE late phase. Regarding MS, induction of endogenous IFNs production in progressive MS patients showed that some patients with improving symptoms had high levels of serum ­IFN-γ, while clinical worsening was related with low serum ­IFN-γ levels.

Stage-Specific Role of IFN-γ

The opposing activities that IFN-γ has in MS and the different models of EAE remain unresolved. However, collective evidence has shown that these paradoxical functions likely reflect a disease stage-specific opposing role of IFN-γ in EAE: promoting pathogenesis during the initiation phase but immunosuppression in the effector phase. Delivery of an intrathecal IFN-γ expression system during the initiation phase triggered an earlier disease onset followed by recovery, while overexpression of IFN-γ in the chronic phase resulted in disease amelioration. Consistently, intraventricular injection of IFN-γ during the initiation phase in CREAE mice increased the number of relapses. More recently, Naves et al. showed that IFNGR-deficient mice exhibited delayed disease onset followed by a more severe chronic phase, compared to WT mice. Similar results have been found analyzing mice lacking the IFN-γ gene or injecting an anti-IFN-γ neutralizing antibody during EAE progression. Furthermore, the administration of IFN-γ to EAE mice during the inductive period led to disease exacerbation, while such treatment was protective during the effector phase. Interestingly, the immunosuppressive activity of IFN-γ required functional type I IFN signaling and signal transducer and activator of transcription (STAT)-1. In this way, stage-specific functions of IFN-γ can reconcile previous conflicting results in EAE and might also explain the mixed outcome reported in RRMS patients treated with IFN-γ.

IFN-γ and Immune Cells

Compelling evidence shows that IFN-γ exerts opposing effects on immune cells during the development of EAE and MS. In addition, several innate and adaptive immune cells play a dual role during the progression of these diseases associated with their IFN-γ production (Figure 1). Below, we will review and discuss this literature, focusing on the less-known protective face of IFN-γ (Table 1).

Macrophages and Neutrophils

IFN-γ controls the infiltration of macrophages and neutrophils into the CNS regulating the course of EAE. Animals deficient in IFN-γ or IFNGR generate an atypical disease affecting mainly the brainstem and cerebellum with increased expression of CXCL2, favoring the recruitment of high numbers of CXCR2-mediated neutrophils; while in conventional EAE, IFN-γ leads to increased CCL2 levels guiding macrophage infiltration into the spinal cord mediated by CCR2. Macrophages and neutrophils produce high levels of nitric oxide (NO), which has both pathogenic and regulatory functions in neuroinflammation. Interestingly, IFN-γ is a primary inducer of NO and mice deficient in inducible nitric oxide synthase (iNOS) develop a severe form of EAE. Willenborg et al. showed that peritoneal exudate cells (PEC), characterized by a high presence of macrophages, are able to inhibit the extensive proliferation of splenocytes from IFNGR-deficient mice with EAE by IFN-γ-dependent NO production. Neutrophils and myeloid-derived suppressor cells (MDSCs) with high expression of Gr-1 also exhibited potent suppressor activity in EAE, inhibiting T cell proliferation through a mechanism that was absolutely dependent on IFN-γ and NO. Additionally, IFN-γ along with interleukin (IL)-4, secreted by activated invariant NKT (iNKT) cells, stimulated MDSCs to suppress EAE via iNOS and arginase (arg)-1 expression.

Natural Killer Cells

NK cells play both a regulatory and pathogenic role in EAE and MS. Although the underlying mechanisms are poorly understood, several studies suggest that IFN-γ-producing NK cells might be driving this duality in a location and stage-dependent manner. NK cells have been identified as the main source of IFN-γ production in the initiation stage of EAE, which might be necessary for migration of pathogenic T cells into the CNS. Interestingly, early but not late depletion of NK cells significantly delayed the onset of disease. IL-18 and IL-21 are two key cytokines involved in NK cell functional maturation. Administration of IL-21 before EAE immunization promoted higher IFN-γ production by NK cells and induced a significantly enhanced acute phase with more intense CNS cell infiltration compared to untreated mice. However, IL-21 treatment failed to induce augmentation of IFN-γ production and had no effect on disease progression when applied for one week starting a few days before disease onset. Similarly, IL-18 injection in WT mice at the time of immunization enhanced disease severity promoting autoreactive Th1 cell development through the induction of IFN-γ by NK cells. Moreover, IFN-γ signaling in NK cells was required to restore EAE susceptibility in IL-18 defective mice. Taken together, these results suggest that early IFN-γ production by NK cells mainly contributes to the initiation, but not progression, of EAE pathogenesis. By contrast, once NK cells infiltrate the CNS, they assume a protective role suppressing myelin-reactive Th17 cells via modulation of microglia activation. This effect was CNS compartment-restricted and was perforin and IFN-γ-dependent. Therefore, signals and/or components generated in the CNS during the effector phase might be inducing protective functions in infiltrating NK cells. Indeed, peptides complexed with the chaperone heat shock protein (Hsp) 70 derived from inflamed brain of EAE mice have been described as promotors of the immunotolerogenic activity of NK cells in EAE. Suppressive effects of Hsp-peptide complex-activated NK cells correlated with high production of IFN-γ and resulted in inhibition of Th17 cells.

NK cell subtypes and iNKT cells may also have IFN-γ-mediated suppressive activity in MS and EAE. Regarding MS, evidence in two independent cohorts of RRMS patients demonstrated that the classically inhibitory CD3−CD56brightCD16− NK cells from RRMS patients have impaired expansion in response to IL-12, and severely diminished IFN-γ production compared to healthy control NK cells. In addition, in vivo activation of iNKT cells at the same time as EAE induction significantly ameliorated disease progression through mechanisms dependent on IFN-γ alone or synergistically with IL-4 and IL-10, resulting in inhibition of the Th17 response.

Dendritic Cells

Dendritic cells (DC) are professional APC important to maintain the balance between immunity and tolerance. In EAE, they efficiently present myelin antigens in order to prime and polarize naïve T cells. They also help regulate EAE severity as evidenced by disease exacerbation in DC deficient mice. The regulatory effects of DC are partly due to the IFN-γ-induced production of IL-27 that suppressed the differentiation and encephalitogenicity of Th9 cells. It also inhibited the production of IL-9 by both Th9 and Th17 cells. This suppression was partially dependent on STAT-1 and T-bet and was necessary to regulate EAE severity. Remarkably, splenic DC exposed to IFN-γ for 48 hours exhibited an immature and tolerogenic phenotype (tol-DC). These tol-DC decreased disease severity in Lewis rats and relapse frequency in SJL/J and B6 mouse models when transferred during the inductive phase. EAE amelioration was accompanied by reduced macrophage activation and CD4+ T cell CNS infiltration, compared to control mice. The therapeutic activity was dependent on an antigen-specific IFN-γ pathway, involving increased DC expression of indoleamine 2,3-dioxygenase (IDO), which induced CD4+ T cell apoptosis.

CD4+ T Lymphocytes

CD4+ T (Th) cells proliferate and differentiate into various subtypes in response to antigen stimulation and their microenvironment in order to exert specific effector or regulatory functions. Effector CD4+ T (Teff) cell lineages, such as Th1 cells, Th2 cells, Th17 cells, and Th9 cells, and regulatory T cells (Tregs) can be distinguished by the cytokines they produce and the transcription factors essential for their differentiation. These T cells also exhibit functional and phenotypical plasticity expressing cytokines and/or transcription factors of other lineages.

Classically, IFN-γ is known for promoting the differentiation of Th1 cells and inhibiting the Th2 immune response which may contribute to neuroinflammation. Despite its inflammatory activity, IFN-γ increased apoptosis and inhibited proliferation of CD4+CD44high (activated) T lymphocytes from both the spleen and CNS of EAE mice. Notably, it also inhibited in vitro proliferation of T cell receptor (TCR)-activated peripheral blood mononuclear cells (PBMC) from progressive MS patients in a dose-dependent manner. Mice depleted of IFN-γ or IFN-γ signaling developed more severe EAE, atypical neurological symptoms, and increased Th17-characteristic inflammation. These data underscore an important anti-inflammatory function of IFN-γ in EAE: the inhibition of pathogenic Th17 cell differentiation and cytokine production. Besides, it has been shown that IFN-γ has a STAT-1-mediated direct inhibitory effect on pathogenic Th9 cells. Interestingly, another study identified a non-pathogenic Th1 cell subset with high IFN-γ expression, capable of restraining EAE development during early stages of disease by suppressing Th17 cells in an IFN-γ-dependent manner. The inhibitory mechanism involved the activation of STAT-1 and IL-21 expression via induction of T-bet. Despite the ability of IFN-γ to directly and indirectly inhibit Th17 cells, a pathogenic population of Th1 cells has been identified in EAE and MS that also expresses IL-17. This capacity to express both cytokines (IFN-γ and IL-17) may be due to the plasticity of Th17 cells, which can undergo a shift toward the Th1 phenotype.

γδ T Cells

Several studies have shown that γδ T cells are present in the CNS of MS patients and EAE mice. Given that activated γδ T cells have the capacity to produce high expression of Th1 and Th17 cytokines, they might contribute to the induction or maintenance of neuroinflammation. However, efforts to determine a role for these cells have given contradictory results. While some studies have found that depletion of γδ T cells resulted in reduced severity of EAE, other reports have described disease aggravation. Regarding IFN-γ, evidence suggests that during early EAE, γδ T cells may act either as a main source of this cytokine or regulate IFN-γ expression in other cell types, including CD4+ and CD8+ T cells. Indeed, SJL/J mice depleted of γδ T cells showed a significant reduction of IFN-γ expression in the CNS at all stages of EAE. Other studies have shown that mice deficient in γδ T cells that are reconstituted with γδ T cells lacking IFN-γ expression developed a significantly delayed and attenuated EAE. This suggested that IFN-γ production by γδ T cells may be central to initial inflammatory events. Despite this, Ponomarev et al. proposed that γδ T cells are required to promote CNS-restricted production of sufficient levels of IFN-γ necessary for EAE recovery.

CD4+ Regulatory T Lymphocytes

It has been reported that IFN-γ is important to the function of Tregs in EAE and MS. Reduced FoxP3 expression and lower frequency and function of Tregs was reported in IFN-γ-deficient mice with EAE, in comparison to EAE-induced WT mice. Remarkably, treatment of CD4+CD25− T cells from WT or IFN-γ-deficient mice with IFN-γ alone or with additional TCR stimulation led to their conversion into Tregs expressing CD25 and FOXP3. These IFN-γ-induced Tregs effectively inhibited EAE disease progression when adoptively transferred into IFN-γ-deficient mice. Human CD4+CD25− T cells from healthy volunteers were similarly converted into functionally active Tregs ex vivo upon IFN-γ stimulation.

A new subpopulation of Tregs expressing T-bet, CXCR3 and IFN-γ, named Th1-like Tregs has been reported in healthy individuals and have regulatory functions focused on Th1-mediated inflammatory diseases. Interestingly, these cells were also described in MS and EAE. An increased frequency of Th1-like Tregs with reduced suppressive function was reported in untreated RRMS patients compared to healthy controls. In this case, addition of IFN-γ neutralizing antibodies recovered their functionality suggesting that IFN-γ might contribute to their reduced immunomodulatory capacity.

CD8+ T Lymphocytes

Several studies have demonstrated that IFN-γ production by CD8+ T cells is a major mediator of EAE induced by cytotoxic T lymphocytes (CTL). One of these investigations showed that atypical EAE induced by intrathecal transfer of myelin basic protein (MBP)-specific CD8+ T cells in C3H mice was ameliorated by co-injection with neutralizing antibodies for IFN-γ. Other studies have identified subsets of regulatory CD8+ T cells (CD8+ Tregs) that suppress EAE development via IFN-γ-dependent mechanisms. Both therapeutic and prophylactic transfer of myelin oligodendroctye glycoprotein MOG-induced CD8+ T cells into mice with EAE ameliorated disease suppressing the chronic phase, but not affecting the disease onset or acute phase. Strikingly, this protective function was lost when IFN-γ-deficient MOG-induced-CD8+ T cells were transferred before EAE induction in WT mice, but was enhanced when IFN-γ production was stimulated in MOG-specific CD8+ T cells before cell transfer. Furthermore, in those studies reporting a pathogenic function, myelin-specific CD8+ T cell lines used to passively induce EAE were generated from CD8+ T cells isolated during the inductive phase. In contrast, regulatory myelin-specific CD8+ T cells were obtained during the chronic phase of disease. Taken together, these results reinforce the notion of a stage-specific IFN-γ-dependent regulation, mediated in this case by CNS-specific regulatory CD8+ T cells.

A naturally occurring CD8+ Tregs subset was identified that expressed latency-associated peptide (LAP) on their cell surface and produced more IFN-γ than their LAP− counterparts. Adoptive transfer of these cells previous to myelin immunization improved EAE recovery mediated by their IFN-γ production. A CD8αα+TCRαβ+ T cell subset capable of preventing EAE when stimulated with a TCR-derived peptide before MBP-peptide immunization in H-2u mouse strains has also been described. Interestingly, the vaccine failed to prevent EAE development in IFN-γ-deficient mice and resulted in delayed disease onset but worsened disease severity compared to control mice, suggesting an important stage-specific role for IFN-γ signaling in CD8αα+TCRαβ+ T cell-mediated protection. A CD8+ Tregs subtype expressing high levels of CD38 ectonucleotidase suppressed Teff cell proliferation in a non-antigen specific, cell-to-cell contact, and IFN-γ-dependent fashion, resulting in ameliorated EAE. Finally, IFN-γ-producing CD8+ T cells induced by glatiramer acetate (GA), a therapy for MS, suppressed EAE in mice via an IDO-dependent mechanism, suggesting that the immunomodulatory action of GA is mediated at least in part by IFN-γ production by CD8+ T cells. Consistently, GA-specific CD8+ T cells from GA-treated RRMS patients tended to produce more IFN-γ than CD8+ T cells from untreated patients. In progressive MS patients, CTL had impaired IL-2 induced IFN-γ production and decreased ability to suppress proliferation of TCR-stimulated autologous lymphocytes.

B Lymphocytes

The effect of IFN-γ on B cells in the neuroinflammatory context of MS and EAE is unclear. Bar-Or and colleagues demonstrated that CD19+ B cells isolated from RRMS patients had significantly increased production of lymphotoxin (TNF-β) and TNF-α in response to IFN-γ and insignificant changes in IL-10 production. In marmoset EAE, exogenous administration of IFN-γ caused no significant clinical change in disease; however, there was a significant decrease in plasma IgG specific to MOG peptides.

Concluding Remarks

Recent studies support the notion that IFN-γ exerts a stage-specific role during EAE development. Strikingly, several innate and adaptive immune cells develop opposite activities during EAE progression, which is related to their production of IFN-γ in a stage-specific manner. Furthermore, the suppressive activity of different types of immune regulatory cells is IFN-γ-dependent. Taken together, these data provide a mechanistic basis explaining the previous controversial results in relation to the role of IFN-γ in EAE and MS. Delineating the varying activities of IFN-γ as well as the role of IFN-γ-producing immune cells during the course of EAE and MS will not only provide insight into the complex role of IFN-γ in these diseases but might also lead to therapies targeting IFN-γ signaling or IFN-γ-producing immune cells. These treatments can be helpful to a selective group of MS patients or during a specific stage of disease.

Conflict of Interest Statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Funding

This review was supported by DIUSS N° 2012-0004-R (LIR), FONDECYT 1140049 (RN) and 1141211 (PIB), and the CONICYT Doctoral fellowship 21130452 (GA).

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    Dungan LS McGuinness NC Boon L Lynch MA Mills KH. Innate IFN-gamma promotes development of experimental autoimmune encephalomyelitis: a role for NK cells and M1 macrophages. Eur J Immunol (2014 ) 44(10):2903–17.

    Not in our library10.1002/eji.201444612

  40. 40.

    Tran EH Prince EN Owens T. IFN-gamma shapes immune invasion of the central nervous system via regulation of chemokines. J Immunol (2000 ) 164(5):2759–68.

    Not in our library10.4049/jimmunol.164.5.2759

  41. 41.

    Lees JR Golumbek PT Sim J Dorsey D Russell JH. Regional CNS responses to IFN-gamma determine lesion localization patterns during EAE pathogenesis. J Exp Med (2008 ) 205(11):2633–42.

    Not in our library10.1084/jem.20080155

  42. 42.

    Stoolman JS Duncker PC Huber AK Segal BM. Site-specific chemokine expression regulates central nervous system inflammation and determines clinical phenotype in autoimmune encephalomyelitis. J Immunol (2014 ) 193(2):564–70.

    Not in our library10.4049/jimmunol.1400825

  43. 43.

    Zehntner SP Brickman C Bourbonniere L Remington L Caruso M Owens T. Neutrophils that infiltrate the central nervous system regulate T cell responses. J Immunol (2005 ) 174(8):5124–31.

    Not in our library10.4049/jimmunol.174.8.5124

  44. 44.

    Zhu B Bando Y Xiao S Yang K Anderson AC Kuchroo VK CD11b+Ly-6C(hi) suppressive monocytes in experimental autoimmune encephalomyelitis. J Immunol (2007 ) 179(8):5228–37.

    Not in our library10.4049/jimmunol.179.8.5228

  45. 45.

    Pastor S Minguela A Mi W Ward ES. Autoantigen immunization at different sites reveals a role for anti-inflammatory effects of IFN-gamma in regulating susceptibility to experimental autoimmune encephalomyelitis. J Immunol (2009 ) 182(9):5268–75.

    Not in our library10.4049/jimmunol.0800681

  46. 46.

    Hao J Liu R Piao W Zhou Q Vollmer TL Campagnolo DI Central nervous system (CNS)-resident natural killer cells suppress Th17 responses and CNS autoimmune pathology. J Exp Med (2010 ) 207(9):1907–21.

    Not in our library10.1084/jem.20092749

  47. 47.

    Galazka G Jurewicz A Domowicz M Cannella B Raine CS Selmaj K. HINT1 peptide/Hsp70 complex induces NK-cell-dependent immunoregulation in a model of autoimmune demyelination. Eur J Immunol (2014 ) 44(10):3026–44.

    Not in our library10.1002/eji.201444694

  48. 48.

    Galazka G Jurewicz A Orlowski W Stasiolek M Brosnan CF Raine CS EAE tolerance induction with Hsp70-peptide complexes depends on H60 and NKG2D activity. J Immunol (2007 ) 179(7):4503–12.

    Not in our library10.4049/jimmunol.179.7.4503

  49. 49.

    Galazka G Stasiolek M Walczak A Jurewicz A Zylicz A Brosnan CF Brain-derived heat shock protein 70-peptide complexes induce NK cell-dependent tolerance to experimental autoimmune encephalomyelitis. J Immunol (2006 ) 176(3):1588–99.

    Not in our library10.4049/jimmunol.176.3.1588

  50. 50.

    Lunemann A Tackenberg B DeAngelis T da Silva RB Messmer B Vanoaica LD Impaired IFN-gamma production and proliferation of NK cells in multiple sclerosis. Int Immunol (2011 ) 23(2):139–48.

    Not in our library10.1093/intimm/dxq463

  51. 51.

    Parekh VV Wu L Olivares-Villagomez D Wilson KT Van Kaer L. Activated invariant NKT cells control central nervous system autoimmunity in a mechanism that involves myeloid-derived suppressor cells. J Immunol (2013 ) 190(5):1948–60.

    Not in our library10.4049/jimmunol.1201718

  52. 52.

    Furlan R Bergami A Cantarella D Brambilla E Taniguchi M Dellabona P Activation of invariant NKT cells by alphaGalCer administration protects mice from MOG35-55-induced EAE: critical roles for administration route and IFN-gamma. Eur J Immunol (2003 ) 33(7):1830–8.

    Not in our library10.1002/eji.200323885

  53. 53.

    Mars LT Araujo L Kerschen P Diem S Bourgeois E Van LP Invariant NKT cells inhibit development of the Th17 lineage. Proc Natl Acad Sci USA (2009 ) 106(15):6238–43.

    Not in our library10.1073/pnas.0809317106

  54. 54.

    Xiao BG Wu XC Yang JS Xu LY Liu X Huang YM Therapeutic potential of IFN-gamma-modified dendritic cells in acute and chronic experimental allergic encephalomyelitis. Int Immunol (2004 ) 16(1):13–22.

    Not in our library10.1093/intimm/dxh003

  55. 55.

    Murugaiyan G Beynon V Pires Da Cunha A Joller N Weiner HL. IFN-gamma limits Th9-mediated autoimmune inflammation through dendritic cell modulation of IL-27. J Immunol (2012 ) 189(11):5277–83.

    Not in our library10.4049/jimmunol.1200808

  56. 56.

    Balashov KE Khoury SJ Hafler DA Weiner HL. Inhibition of T cell responses by activated human CD8+ T cells is mediated by interferon-gamma and is defective in chronic progressive multiple sclerosis. J Clin Invest (1995 ) 95(6):2711–9.

    Not in our library10.1172/jci117973

  57. 57.

    Chu CQ Wittmer S Dalton DK. Failure to suppress the expansion of the activated CD4 T cell population in interferon gamma-deficient mice leads to exacerbation of experimental autoimmune encephalomyelitis. J Exp Med (2000 ) 192(1):123–8.

    Not in our library10.1084/jem.192.1.123

  58. 58.

    Park H Li Z Yang XO Chang SH Nurieva R Wang YH A distinct lineage of CD4 T cells regulates tissue inflammation by producing interleukin 17. Nat Immunol (2005 ) 6(11):1133–41.

    Not in our library10.1038/ni1261

  59. 59.

    Berghmans N Nuyts A Uyttenhove C Van Snick J Opdenakker G Heremans H. Interferon-gamma orchestrates the number and function of Th17 cells in experimental autoimmune encephalomyelitis. J Interferon Cytokine Res (2011 ) 31(7):575–87.

    Not in our library10.1089/jir.2010.0137

  60. 60.

    Yeh WI McWilliams IL Harrington LE. Autoreactive Tbet-positive CD4 T cells develop independent of classic Th1 cytokine signaling during experimental autoimmune encephalomyelitis. J Immunol (2011 ) 187(10):4998–5006.

    Not in our library10.4049/jimmunol.1100031

  61. 61.

    Mangalam AK Luo N Luckey D Papke L Hubbard A Wussow A Absence of IFN-gamma increases brain pathology in experimental autoimmune encephalomyelitis-susceptible DRB1*0301.DQ8 HLA transgenic mice through secretion of proinflammatory cytokine IL-17 and induction of pathogenic monocytes/microglia into the central nervous system. J Immunol (2014 ) 193(10):4859–70.

    Not in our library10.4049/jimmunol.1302008

  62. 62.

    Yeh WI McWilliams IL Harrington LE. IFNgamma inhibits Th17 differentiation and function via Tbet-dependent and Tbet-independent mechanisms. J Neuroimmunol (2014 ) 267(1–2):20–7.

    Not in our library10.1016/j.jneuroim.2013.12.001

  63. 63.

    Wildbaum G Zohar Y Karin N. Antigen-specific CD25- Foxp3- IFN-gamma(high) CD4+ T cells restrain the development of experimental allergic encephalomyelitis by suppressing Th17. Am J Pathol (2010 ) 176(6):2764–75.

    Not in our library10.2353/ajpath.2010.090855

  64. 64.

    Ponomarev Novikova M Yassai M Szczepanik M Gorski J Dittel BN. Gamma delta T cell regulation of IFN-gamma production by central nervous system-infiltrating encephalitogenic T cells: correlation with recovery from experimental autoimmune encephalomyelitis. J Immunol (2004 ) 173(3):1587–95.

    Not in our library10.4049/jimmunol.173.3.1587

  65. 65.

    Wang Z Hong J Sun W Xu G Li N Chen X Role of IFN-γ in induction of Foxp3 and conversion of CD4+CD25-T cells to CD4+ Tregs. J Clin Invest (2006 ) 116:2434–41.

    Not in our library10.1172/jci25826

  66. 66.

    Ortega SB Kashi VP Tyler AF Cunnusamy K Mendoza JP Karandikar NJ. The disease-ameliorating function of autoregulatory CD8 T cells is mediated by targeting of encephalitogenic CD4 T cells in experimental autoimmune encephalomyelitis. J Immunol (2013 ) 191(1):117–26.

    Not in our library10.4049/jimmunol.1300452

  67. 67.

    Chen ML Yan BS Kozoriz D Weiner HL. Novel CD8+ Treg suppress EAE by TGF-beta- and IFN-gamma-dependent mechanisms. Eur J Immunol (2009 ) 39(12):3423–35.

    Not in our library10.1002/eji.200939441

  68. 68.

    Tang X Maricic I Kumar V. Anti-TCR antibody treatment activates a novel population of nonintestinal CD8 alpha alpha+ TCR alpha beta+ regulatory T cells and prevents experimental autoimmune encephalomyelitis. J Immunol (2007 ) 178(10):6043–50.

    Not in our library10.4049/jimmunol.178.10.6043

  69. 69.

    Tang X Maricic I Purohit N Bakamjian B Reed-Loisel LM Beeston T Regulation of immunity by a novel population of Qa-1-restricted CD8alphaalpha+TCRalphabeta+ T cells. J Immunol (2006 ) 177(11):7645–55.

    Not in our library10.4049/jimmunol.177.11.7645

  70. 70.

    Beeston T Smith TR Maricic I Tang X Kumar V. Involvement of IFN-gamma and perforin, but not Fas/FasL interactions in regulatory T cell-mediated suppression of experimental autoimmune encephalomyelitis. J Neuroimmunol (2010 ) 229(1–2):91–7.

    Not in our library10.1016/j.jneuroim.2010.07.007

  71. 71.

    Bahri R Bollinger A Bollinger T Orinska Z Bulfone-Paus S. Ectonucleotidase CD38 demarcates regulatory, memory-like CD8+ T cells with IFN-gamma-mediated suppressor activities. PLoS One (2012 ) 7(9):e45234.

    Not in our library10.1371/journal.pone.0045234

  72. 72.

    Tyler AF Mendoza JP Firan M Karandikar NJ. CD8 T cells are required for glatiramer acetate therapy in autoimmune demyelinating disease. PLoS One (2013 ) 8(6):e66772.

    Not in our library10.1371/journal.pone.0066772

  73. 73.

    Karandikar NJ Crawford MP Yan X Ratts RB Brenchley JM Ambrozak DR Glatiramer acetate (Copaxone) therapy induces CD8(+) T cell responses in patients with multiple sclerosis. J Clin Invest (2002 ) 109(5):641–9.

    Not in our library10.1172/jci14380

  74. 74.

    Lee E Chanamara S Pleasure D Soulika AM. IFN-gamma signaling in the central nervous system controls the course of experimental autoimmune encephalomyelitis independently of the localization and composition of inflammatory foci. J Neuroinflammation (2012 ) 9:7.

    Not in our library10.1186/1742-2094-9-7

  75. 75.

    Willenborg DO Staykova M Fordham S O’Brien N Linares D. The contribution of nitric oxide and interferon gamma to the regulation of the neuro-inflammation in experimental autoimmune encephalomyelitis. J Neuroimmunol (2007 ) 191(1–2):16–25.

    Not in our library10.1016/j.jneuroim.2007.09.007

  76. 76.

    Fenyk-Melody JE Garrison AE Brunnert SR Weidner JR Shen F Shelton BA Experimental autoimmune encephalomyelitis is exacerbated in mice lacking the NOS2 gene. J Immunol (1998 ) 160(6):2940–6.

    Not in our library

  77. 77.

    Sahrbacher UC Lechner F Eugster HP Frei K Lassmann H Fontana A. Mice with an inactivation of the inducible nitric oxide synthase gene are susceptible to experimental autoimmune encephalomyelitis. Eur J Immunol (1998 ) 28(4):1332–8.

    Not in our library10.1002/(sici)1521-4141(199804)28:04<1332::aid-immu1332>3.3.co;2-7

  78. 78.

    Maghazachi AA Role of natural killer cells in multiple sclerosis. ISRN Immunol (2012 ) 2012:14

    Not in our library10.5402/2012/795075

  79. 79.

    Segal BM. The role of natural killer cells in curbing neuroinflammation. J Neuroimmunol (2007 ) 191(1–2):2–7.

    Not in our library10.1016/j.jneuroim.2007.09.006

  80. 80.

    Kaur G Trowsdale J Fugger L. Natural killer cells and their receptors in multiple sclerosis. Brain (2013 ) 136(Pt 9):2657–76.

    Not in our library10.1093/brain/aws159

  81. 81.

    Takahashi K Aranami T Endoh M Miyake S Yamamura T. The regulatory role of natural killer cells in multiple sclerosis. Brain (2004 ) 127(Pt 9):1917–27.

    Not in our library10.1093/brain/awh219

  82. 82.

    Zhang B Yamamura T Kondo T Fujiwara M Tabira T. Regulation of experimental autoimmune encephalomyelitis by natural killer (NK) cells. J Exp Med (1997 ) 186(10):1677–87.

    Not in our library10.1084/jem.186.10.1677

  83. 83.

    Matsumoto Y Kohyama K Aikawa Y Shin T Kawazoe Y Suzuki Y Role of natural killer cells and TCR gamma delta T cells in acute autoimmune encephalomyelitis. Eur J Immunol (1998 ) 28(5):1681–8.

    Not in our library10.1002/(sici)1521-4141(199805)28:05<1681::aid-immu1681>3.0.co;2-t

  84. 84.

    Winkler-Pickett R Young HA Cherry JM Diehl J Wine J Back T In vivo regulation of experimental autoimmune encephalomyelitis by NK cells: alteration of primary adaptive responses. J Immunol (2008 ) 180(7):4495–506.

    Not in our library10.4049/jimmunol.180.7.4495

  85. 85.

    Morandi B Bramanti P Bonaccorsi I Montalto E Oliveri D Pezzino G Role of natural killer cells in the pathogenesis and progression of multiple sclerosis. Pharmacol Res (2008 ) 57(1):1–5.

    Not in our library10.1016/j.phrs.2007.11.003

  86. 86.

    Xu W Fazekas G Hara H Tabira T. Mechanism of natural killer (NK) cell regulatory role in experimental autoimmune encephalomyelitis. J Neuroimmunol (2005 ) 163(1–2):24–30.

    Not in our library10.1016/j.jneuroim.2005.02.011

  87. 87.

    Shi FD Takeda K Akira S Sarvetnick N Ljunggren HG. IL-18 directs autoreactive T cells and promotes autodestruction in the central nervous system via induction of IFN-gamma by NK cells. J Immunol (2000 ) 165(6):3099–104.

    Not in our library10.4049/jimmunol.165.6.3099

  88. 88.

    Brady J Hayakawa Y Smyth MJ Nutt SL. IL-21 induces the functional maturation of murine NK cells. J Immunol (2004 ) 172(4):2048–58.

    Not in our library10.4049/jimmunol.172.4.2048

  89. 89.

    Strengell M Matikainen S Siren J Lehtonen A Foster D Julkunen I IL-21 in synergy with IL-15 or IL-18 enhances IFN-gamma production in human NK and T cells. J Immunol (2003 ) 170(11):5464–9.

    Not in our library10.4049/jimmunol.170.11.5464

  90. 90.

    Vollmer TL Liu R Price M Rhodes S La Cava A Shi FD. Differential effects of IL-21 during initiation and progression of autoimmunity against neuroantigen. J Immunol (2005 ) 174(5):2696–701.

    Not in our library10.4049/jimmunol.174.5.2696

  91. 91.

    Xie ZX Zhang HL Wu XJ Zhu J Ma DH Jin T. Role of the immunogenic and tolerogenic subsets of dendritic cells in multiple sclerosis. Mediators Inflamm (2015 ) 2015:513295.

    Not in our library10.1155/2015/513295

  92. 92.

    Ganguly D Haak S Sisirak V Reizis B. The role of dendritic cells in autoimmunity. Nat Rev Immunol (2013 ) 13(8):566–77.

    Not in our library10.1038/nri3477

  93. 93.

    Zhu J Yamane H Paul WE. Differentiation of effector CD4 T cell populations (*). Annu Rev Immunol (2010 ) 28:445–89.

    Not in our library10.1146/annurev-immunol-030409-101212

  94. 94.

    Barnes MJ Powrie F Hybrid Treg cells: steel frames and plastic exteriors. Nat Immunol (2009 ) 10:563–4.

    Not in our library10.1038/ni0609-563

  95. 95.

    Kleinewietfeld M Hafler DA. The plasticity of human Treg and Th17 cells and its role in autoimmunity. Semin Immunol (2013 ) 25:305–12.

    Not in our library10.1016/j.smim.2013.10.009

  96. 96.

    Legroux L Arbour N. Multiple sclerosis and T lymphocytes: an entangled story. J Neuroimmune Pharmacol (2015 ).

    Not in our library10.1007/s11481-015-9614-0

  97. 97.

    Kuchroo VK Anderson AC Waldner H Munder M Bettelli E Nicholson LB. T cell response in experimental autoimmune encephalomyelitis (EAE): role of self and cross-reactive antigens in shaping, tuning, and regulating the autopathogenic T cell repertoire. Annu Rev Immunol (2002 ) 20:101–23.

    Not in our library10.1146/annurev.immunol.20.081701.141316

  98. 98.

    Kurschus FC Croxford AL Heinen AP Wortge S Ielo D Waisman A. Genetic proof for the transient nature of the Th17 phenotype. Eur J Immunol (2010 ) 40(12):3336–46.

    Not in our library10.1002/eji.201040755

  99. 99.

    Hirota K Duarte JH Veldhoen M Hornsby E Li Y Cua DJ Fate mapping of IL-17-producing T cells in inflammatory responses. Nat Immunol (2011 ) 12(3):255–63.

    Not in our library10.1038/ni.1993

  100. 100.

    Paul S Shilpi Lal G. Role of gamma-delta (gammadelta) T cells in autoimmunity. J Leukoc Biol (2015 ) 97(2):259–71.

    Not in our library10.1189/jlb.3ru0914-443r

  101. 101.

    Wohler JE Smith SS Zinn KR Bullard DC Barnum SR. Gammadelta T cells in EAE: early trafficking events and cytokine requirements. Eur J Immunol (2009 ) 39(6):1516–26.

    Not in our library10.1002/eji.200839176

  102. 102.

    Rajan AJ Klein JD Brosnan CF. The effect of gammadelta T cell depletion on cytokine gene expression in experimental allergic encephalomyelitis. J Immunol (1998 ) 160(12):5955–62.

    Not in our library

  103. 103.

    Duhen T Duhen R Lanzavecchia A Sallusto F Campbell DJ. Functionally distinct subsets of human FOXP3+ Treg cells that phenotypically mirror effector Th cells. Blood (2012 ) 119(19):4430–40.

    Not in our library10.1182/blood-2011-11-392324

  104. 104.

    Daniel V Sadeghi M Wang H Opelz G. CD4+CD25+Foxp3+IFN-gamma+ human induced T regulatory cells are induced by interferon-gamma and suppress alloresponses nonspecifically. Hum Immunol (2011 ) 72(9):699–707.

    Not in our library10.1016/j.humimm.2011.05.020

  105. 105.

    Venigalla RK Guttikonda PJ Eckstein V Ho AD Sertel S Lorenz HM Identification of a human Th1-like IFNgamma-secreting Treg subtype deriving from effector T cells. J Autoimmun (2012 ) 39(4):377–87.

    Not in our library10.1016/j.jaut.2012.06.004

  106. 106.

    Koch Ma Tucker-heard G Perdue NR Killebrew JR Urdahl B Campbell DJ. T-bet controls regulatory T cell homeostasis and function during type-1 inflammation. Nat Immunol (2009 ) 10:595–602.

    Not in our library10.1038/ni.1731.t-bet

  107. 107.

    Koch Ma Thomas KN Perdue NR Smigiel KS Srivastava S Campbell DJ. T-bet+ Treg cells undergo abortive Th1 cell differentiation due to impaired expression of IL-12 receptor β2. Immunity (2012 ) 37:501–10.

    Not in our library10.1016/j.immuni.2012.05.031.t-bet

  108. 108.

    Zheng J Liu Y Qin G Lam KT Guan J Xiang Z Generation of human Th1-like regulatory CD4+ T cells by an intrinsic IFN-gamma- and T-bet-dependent pathway. Eur J Immunol (2011 ) 41(1):128–39.

    Not in our library10.1002/eji.201040724

  109. 109.

    Esposito M Ruffini F Bergami A Garzetti L Borsellino G Battistini L IL-17- and IFN-γ-secreting Foxp3+ T cells infiltrate the target tissue in experimental autoimmunity. J Immunol (2010 ) 185:7467–73.

    Not in our library10.4049/jimmunol.1001519

  110. 110.

    Dominguez-Villar M Baecher-Allan CM Hafler Da. Identification of T helper type 1-like, Foxp3+ regulatory T cells in human autoimmune disease. Nature medicine (2011 ) 17:673–5.

    Not in our library10.1038/nm.2389

  111. 111.

    Ford ML Evavold BD. Specificity, magnitude, and kinetics of MOG-specific CD8+ T cell responses during experimental autoimmune encephalomyelitis. Eur J Immunol (2005 ) 35(1):76–85.

    Not in our library10.1002/eji.200425660

  112. 112.

    Huseby ES Liggitt D Brabb T Schnabel B Ohlen C Goverman J. A pathogenic role for myelin-specific CD8(+) T cells in a model for multiple sclerosis. J Exp Med (2001 ) 194(5):669–76.

    Not in our library10.1084/jem.194.5.669

  113. 113.

    Bettini M Rosenthal K Evavold BD. Pathogenic MOG-reactive CD8+ T cells require MOG-reactive CD4+ T cells for sustained CNS inflammation during chronic EAE. J Neuroimmunol (2009 ) 213(1–2):60–8.

    Not in our library10.1016/j.jneuroim.2009.05.017

  114. 114.

    Sun D Whitaker JN Huang Z Liu D Coleclough C Wekerle H Myelin antigen-specific CD8+ T cells are encephalitogenic and produce severe disease in C57BL/6 mice. J Immunol (2001 ) 166(12):7579–87.

    Not in our library10.4049/jimmunol.166.12.7579

  115. 115.

    York NR Mendoza JP Ortega SB Benagh A Tyler AF Firan M Immune regulatory CNS-reactive CD8+T cells in experimental autoimmune encephalomyelitis. J Autoimmun (2010 ) 35(1):33–44.

    Not in our library10.1016/j.jaut.2010.01.003

  116. 116.

    Smith TR Kumar V. Revival of CD8+ Treg-mediated suppression. Trends Immunol (2008 ) 29(7):337–42.

    Not in our library10.1016/j.it.2008.04.002

  117. 117.

    Bar-Or A Fawaz L Fan B Darlington PJ Rieger A Ghorayeb C Abnormal B-cell cytokine responses a trigger of T-cell-mediated disease in MS? Ann Neurol (2010 ) 67(4):452–61.

    Not in our library10.1002/ana.21939

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