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Functional Abnormalities in Helper and Suppressor of T‐cells in Myasthenia Gravis of Children

Proportions and functions of T cell subsets in MG were estimated. The percentage of IgGFcRf T cells (T cells bearing receptor for Fc position of IgG) elevated in some cases. Total T cell population from MG suppressed the immunoglobulin production from the normal lymphocytes stimulated with Poke Weed Mitogen (PWM). IgGFcR+ T cells enriched T cell population that can be obtained as the cells losing sheep erythrocyte rosette forming ability by the treatment with Neophyllin, suppressed immunoglobulin production with PWM. IgGFcR+ T cells increased in MG seemed to work as suppressor. IgGFcR+ T cells from normal controls which originally had no effect showed some suppressive effect on immunoglobulin production when they were treated with heat-aggregated IgC. Induction of suppressor function to IgGFcR + cells by heataggregated IgG was probably caused by the interaction of immune complex and Fc receptor on IgGFcR+ cells. T cells from MG showed an almost normal helper function. The differentiation of B cells into immunoglobulin producing cells was normal when T cells were treated with mitomycin C and suppressors were eliminated. These data indicate the presence of the disturbances in the T cell system and they may relate with abnormal immune reactions observed in MG.