Abstract
Intracerebral inoculation of Theiler's murine encephalomyelitis virus (TMEV) into susceptible mouse strains produces a chronic demyelinating disease in which mononuclear cell-rich infiltrates in the central nervous system (CNS) are prominent. Current evidence strongly supports an immune-mediated basis for myelin breakdown, with an effector role proposed for TMEV-specific, major histocompatibility complex (MHC) class II-restricted delayed-type hypersensitivity (DTH) responses in which lymphokine-activated macrophages mediate bystander demyelination. The present study examined the possibility that concomitant or later-appearing neuroantigen-specific autoimmune T cell responses, such as those demonstrated in chronic-relapsing experimental allergic encephalomyelitis (R-EAE), may contribute to the demyelinating process following TMEV infection. T cell responses against intact, purified major myelin proteins (myelin basic protein (MBP) and proteolipid protein (PLP), and against altered myelin constituents were readily demonstrable in SJL/J mice with R-EAE, but were not detectable in SJL/J mice with TMEV-induced demyelinating disease. TMEV-infected mice also did not display T cell responses against the peptide fragments of MBP(91–104) and PLP(139–151) recently shown to be encephalitogenic in SJL/J mice. In addition, induction of neuroantigen-specific tolerance to a heterogeneous mixture of CNS antigens, via the i.v. injection of syngeneic SJL/J splenocytes covalently coupled with mouse spinal cord homogenate, resulted in significant suppression of clinical and histologic signs of R-EAE and the accompanying MBP- and PLP-specific DTH responses. In contrast, neuroantigen-specific tolerance failed to alter the development of clinical and histologic signs of TMEV-induced demyelinating disease or the accompanying virus-specific DTH and humoral immune responses. These findings demonstrate that TMEV-induced demyelinating disease can occur in the apparent absence of neuroantigen-specific autoimmune responses. The relationship of the present results to the immunopathology of multiple sclerosis is discussed.
Keywords: Theiler's virus, Relapsing experimental autoimmune encephalomyelitis, Myelin basic protein, Proteolipid apoprotein, Neuroantigen-specific tolerance, Multiple sclerosis
Abbreviations: CMI, cell-mediated immunity; CNS, central nervous system; DTH, delayed-type hypersensitivity; i.c., intracerebral; MBP, myelin basic protein; MDO, mean day of onset; MHC, major histocompatibility complex; MS, multiple sclerosis; MSCH, mouse spinal cord homogenate; MSCH-SP, MSCH-coupled splenocytes; PCFIA, particle concentration fluorescence immunoassay; pfu, plaque-forming unit; p.i., post-infection; PLP, proteolipid apoprotein; R-EAE, chronic-relapsing experimental allergic encephalomyelitis; rfu, relative fluorescence units; TMEV, Theiler's murine encephalomyelitis virus; TDH, delayed-type hypersensitivity T cell(s); Tprlf, T cell proliferation
Footnotes
This work was supported in part by U.S. Public Health Service Grants NS-26543, NS-23349, NS-21913, NS-13011, AI-18755, and National Multiple Sclerosis Society Grants RG-1487 and RG2014-A-2.
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