Cell‐mediated immunity to myelin basic protein in Lewis rats made unresponsive to experimental allergic encephalomyelitis

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Abstract
Lewis rats with experimental allergic encephalomyelitis (EAE) exhibited cellmediated immunity to myelin basic protein as determined both with in vivo and in vitro assays. Positive skin test reactions and production of migration inhibitory factor (MIF) were observed before onset and after recovery from EAE. Rats rendered unresponsive to EAE exhibited in vitro cell‐mediated immunity to basic protein, although in vivo manifestations were depressed. However, tolerant rats failed to respond to the encephalitogenic determinant; rats with EAE exhibited cell‐mediated immunity to this region of the molecule. The results indicate that EAE‐unresponsive rats possess lymphocytes capable of responding to basic protein, but that reactivity to the encephalitogenic peptide is suppressed.

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