Abstract
To determine the functional diversity of thymic lymphoid cells in patients with myasthenia gravis (MG), we evaluated mixed lymphocyte reactions (MLR) using thymus cells in 7 MG patients and 8 controls. In the MLR, we used thymus cells as responder cells and mitomycin C-treated peripheral non-T cells as stimulator cells. In an autologous MLR test, a low proliferative response was observed in both the MG patients and controls. In an allogeneic MLR test, in which thymus cells were co-cultured with allogeneic non-T cells, the thymus cells from MG patients showed an increased proliferative response to stimulator cells, whether they were from MG patients or the controls. However, thymus cells from the controls showed a low proliferative response to any allogeneic stimulator cells. The enhanced allo-reactivity of thymus cells from MG patients thus suggests that there is an increase in the number of functionally mature T lineage cells in the MG thymus.
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