Abstract
A myelin basic protein (MBP)-specific T cell line derived from F1 hybrids between experimental allergic encephalomyelitis (EAE)-susceptible DA (RT1 av1) strain and EAE-resistant AO (RT1 u) strain was capable of inducing clinical EAE in F1 hybrids and DA, but not in AO rats. In vitro restimulation with MBP presented by AO antigen-presenting cells (APC) resulted in the generation of a MBP-specific subline restricted by RT1 u MHC products which induced clinical EAE in F1 hybrids but not in the AO parental strain. Deletion of hosts' leukocytes using sublethal irradiation and cytotoxic drugs did not abrogate the resistance of AO rats, which argues against the involvement of hosts' lymphoid cells in the regulation of autoagression. Thus, mechanism(s) regulating the activity of autoagressive T cells on functional elements in the target tissue might be responsible for differences in susceptibility to EAE.
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