Theiler's Murine Encephalomyelitis Virus (TMEV)-Induced Demyelination: A Model for Human Multiple Sclerosis

Methods : a Companion to Methods in Enzymology
Dal Canto MCR W Melvold

Abstract

Numerous studies suggest that a viral infection, on the appropriate genetic background, may play an important pathogenetic role in the development of multiple sclerosis (MS). Among the several viral models of demyelination that have been investigated during the past two decades, Theiler's murine encephalomyelitis virus (TMEV)-induced demyelinating disease has emerged as one of the best because, similarly to MS, it is based on a combined viral-immune pathogenesis. This review highlights the following salient features of this model. TMEV-induced demyelinating disease is a chronic process, lasting for the life of the animals. Lesions consist of well-demarcated plaques of demyelination, which are strictly related to the presence of mononuclear cell infiltrates. Myelin degeneration is not due to direct viral cytopathic effects, but is rather dependent on the host immune response. Susceptibility/resistance to the disease is genetically regulated, and multiple genes both in and outside the major histocompatibility complex appear to be involved. The best immunological parameter that correlates with susceptibility is the ability of a murine strain to mount a delayed-type hypersensitivity (DTH) response to one or more viral epitopes. The...Continue Reading

Citations

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