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We report a comparative study of the B- and T-cell responses to the extracellular immunoglobulin (Ig)-like domain of human myelin-oligodendrocyte glycoprotein (MOG(Igd)) in the blood of patients with multiple sclerosis and healthy controls using a bacterial recombinant human protein (rhMOG(Igd)). The frequency of anti-rhMOG(Igd)-seropositive samples, as determined by Western blotting, was significantly higher in the multiple sclerosis group (54%) than in normal random controls (excluding laboratory workers exposed to MOG) (22%; P = 0.02). In contrast, there was no difference in rhMOG(Igd)-induced proliferation indices of peripheral blood T cells between patients and controls. To characterize the rhMOG(Igd)-reactive T-cell repertoire, we isolated a panel of MOG-specific CD4(+) T-cell lines from multiple sclerosis patients and normal subjects, and these revealed a heterogeneous response with respect to epitope specificity, cytokine response, MHC (major histocompatibility complex) restriction and T-cell receptor Vbeta-chain usage. The majority of the T-cell lines recognized epitopes in the N-terminal region of MOG (amino acids 1-60). One epitope (represented by peptide 27-50) was exclusively recognized by T-cell lines from normal controls. Forty per cent of the MOG-specific T-cell lines analysed displayed a Th-2 or Th-0 cytokine profile and could therefore act as helper T cells in vivo.

Multiple sclerosis: B- and T-cell responses to the extracellular domain of the myelin oligodendrocyte glycoprotein