Abstract
Most natural killer (NK) T cells express an invariant Valpha14 T-cell receptor. To explore the contribution of NKT cells in an animal model for multiple sclerosis, Theiler's murine encephalomyelitis virus (TMEV) infection, TMEV-infected mice were treated with Valpha14 antibody. Treatment during the early stage of infection delayed the onset of demyelinating disease with higher interleukin-4 production, whereas administration during the late stage or weekly resulted in more severe demyelination with enhanced virus persistence. The effect of in vivo depletion of NKT cells differed depending on the stage of infection, suggesting contrasting roles for NKT cells over the disease course.
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