Theiler's murine encephalomyelitis virus (TMEV)-induced demyelinating disease (TMEV-IDD) is widely considered the most relevant animal model of virus-induced autoimmune-mediated demyelinating disease. MS is believed to involve an autoimmune pathology, but epidemiological evidence strongly suggests a viral trigger. TMEV are natural mouse pathogens and intracerebral inoculation of susceptible SJL mice with the BeAn strain of TMEV results in a chronic-progressive, inflammatory immune-mediated demyelinating disorder which is related to life-long persistent CNS virus infection and characterized by spastic hind limb paralysis. In contrast, resistant C57BL/6 mice make a potent CTL response and rapidly clear the infection. Like MS, TMEV-IDD is characterized by progressive demyelination with accompanying mononuclear cell infiltrates dominated by CD4+ T cells and activated APCs (microglia/macrophages/DCs). Our previous studies have shown that demyelination is initiated by virus-specific CD4+ T cells targeting viral epitopes presented by persistently infected CNS- resident APCs. Chronic demyelination is mediated by induction of autoimmune responses to a variety of endogenous encephalitogenic myelin epitopes which arise via epitope spreading. This application proposes continue our productive studies funded by an NIH PPG for the past 21 years. Based on extensive new preliminary data, we will examine the role of innate immune regulatory and innate immune stimulatory mechanisms involved in regulating susceptibility/resistance to TMEV-IDD at both the level of immune- mediated virus clearance to acute infection and regulation of autoimmune processes during chronic demyelination. Employing depletion, supplementation and genetic approaches, Aim 1 will test the hypothesis that activation of CD4+CD25+Foxp3+ Tregs plays a major role in regulating susceptibility to TMEV-IDD by inhibiting development of virus-specific CD4, CD8, and antibody responses during acute infection leading to establishment of CNS virus persistence and hence eventual development of chronic autoimmunity.
Aim 2 will test the hypothesis that the pro-inflammatory effects of both myelin epitope-specific autoreactive Th1 (IFN-3) and Th17 (IL-17) cells are critical for mediating demyelinating immunopathology during the chronic autoimmune phase of TMEV-IDD.
Aim 3, will test the hypothesis that peripherally-derived, CNS-resident DCs play a critical role in driving the activation of epitope spreading to myelin-specific CD4+ Th1/17 cells responsible for CNS pathology in chronic TMEV-IDD. Innate immune responses (expression of cytokines;chemokines;and antigen presentation molecules);and functional ability of CNS-derived DCs, MUs and microglia from TMEV-infected mice to activate T cell proliferation and differentiation of naove CD4 and memory CD4+ (Th1, Th2 and Th17) and CD8+ T cells by will be determined. These studies will provide important information on the mechanisms underlying susceptibility/resistance in virus-induced demyelination and are applicable for the future design of treatment strategies for MS and other CNS inflammatory diseases.

Public Health Relevance

Multiple sclerosis (MS) is an autoimmune paralytic disease caused by immune cell-mediated destruction of myelin-producing oligodendrocytes in the central nervous system. Certain forms of MS are suspected to occur as a secondary consequence a virus infection in genetically susceptible individuals. We will employ a mouse model of MS induced by infection with Theiler's murine encephalomyelitis virus to study the role of regulatory T cells in determining genetic susceptibility to disease in different strains of inbred mice, and to determine the role of dendritic cells, specialized antigen presenting cells of the innate immune system, both in inducing virus immunity in the acute stages of the disease and in inducing development of autoimmune T cells making destructive cytokines (IFN-3 and IL-17) in the chronic phase of disease.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
5R01NS062365-03
Application #
8249089
Study Section
Hypersensitivity, Autoimmune, and Immune-mediated Diseases Study Section (HAI)
Program Officer
Utz, Ursula
Project Start
2010-04-01
Project End
2015-03-31
Budget Start
2012-04-01
Budget End
2013-03-31
Support Year
3
Fiscal Year
2012
Total Cost
$326,922
Indirect Cost
$112,547
Name
Northwestern University at Chicago
Department
Microbiology/Immun/Virology
Type
Schools of Medicine
DUNS #
005436803
City
Chicago
State
IL
Country
United States
Zip Code
60611
James, Rachel E; Hillis, James; Adorján, István et al. (2016) Loss of galectin-3 decreases the number of immune cells in the subventricular zone and restores proliferation in a viral model of multiple sclerosis. Glia 64:105-21
Chastain, Emily M L; Getts, Daniel R; Miller, Stephen D (2015) Deficient Natural Killer Dendritic Cell Responses Underlay the Induction of Theiler's Virus-Induced Autoimmunity. MBio 6:e01175
Getts, Daniel R; Chastain, Emily M L; Terry, Rachael L et al. (2013) Virus infection, antiviral immunity, and autoimmunity. Immunol Rev 255:197-209
Eaton, Valerie L; Vasquez, Kristine O; Goings, Gwendolyn E et al. (2013) Optical tomographic imaging of near infrared imaging agents quantifies disease severity and immunomodulation of experimental autoimmune encephalomyelitis in vivo. J Neuroinflammation 10:138
Rodgers, Jane M; Robinson, Andrew P; Miller, Stephen D (2013) Strategies for protecting oligodendrocytes and enhancing remyelination in multiple sclerosis. Discov Med 16:53-63
Ren, Zhihua; Wang, Yan; Duan, Tao et al. (2012) Cross-immunoreactivity between bacterial aquaporin-Z and human aquaporin-4: potential relevance to neuromyelitis optica. J Immunol 189:4602-11
Chastain, Emily M L; Miller, Stephen D (2012) Molecular mimicry as an inducing trigger for CNS autoimmune demyelinating disease. Immunol Rev 245:227-38
Rodgers, Jane M; Miller, Stephen D (2012) Cytokine control of inflammation and repair in the pathology of multiple sclerosis. Yale J Biol Med 85:447-68
McCarthy, Derrick P; Richards, Maureen H; Miller, Stephen D (2012) Mouse models of multiple sclerosis: experimental autoimmune encephalomyelitis and Theiler's virus-induced demyelinating disease. Methods Mol Biol 900:381-401
Chang, Rhoda A; Miller, Stephen D; Longnecker, Richard (2012) Epstein-Barr virus latent membrane protein 2A exacerbates experimental autoimmune encephalomyelitis and enhances antigen presentation function. Sci Rep 2:353

Showing the most recent 10 out of 19 publications