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Specific and strain-independent effects of dexamethasone in the prevention and treatment of experimental autoimmune encephalomyelitis in rodents.
Scandinavian Journal of Immunology 2010 November
Experimental autoimmune encephalomyelitis in rodents (EAE) is a generally accepted in vivo model for immunopathogenic mechanisms underlying multiple sclerosis (MS). There are, however, different forms of rodent EAE, and therapeutic regimens may affect these forms differently. We have therefore tested the effects of dexamethasone (Dex) and found that both prophylactic and early therapeutic regimens were effective in suppressing the development of monophasic EAE in myelin basic protein-immunized Lewis rats, the relapsing-remitting forms of EAE induced in SJL mice by proteolipid protein and in DA rats by syngeneic spinal cord homogenate, and the progressive forms induced in C57BL/6 and DBA/1 mice by immunization with myelin oligodendrocyte glycoprotein. In addition, prophylactically administered Dex suppressed histological and immunological features of EAE such as spinal cord infiltration of inflammatory cells and the increased frequency of autoantigen-specific interferon-gamma-secreting lymph node mononuclear cells. The present data reproduced in rodent EAE models some of the beneficial effects observed with glucocorticoids in MS. This strengthens the validity of these five models as in vivo predictors of drug efficacy in at least some variants of human MS. Better understanding of the clinical and immunopharmacologic features of these models might prove useful when testing new drug candidates for MS treatment.
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