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Normal T cell regulation of IgG synthesis in systemic lupus erythematosus.

The regulation of pokeweed mitogen (PWM) stimulated IgG synthesis by peripheral blood mononuclear cells (PBL) was studied in patients with systemic lupus erythematosus (SLE) and controls. The helper-T, suppressor-T and B cell functions of SLE-PBL were separately evaluated and compared to the functions of control lymphocyte populations. SLE-T cells function normally both in helper and suppressor modulation of PWM-stimulated IgG secretion by control or autologous B cells. The SLE-B cell, however, fails to synthesize normal quantities of IgG when cultured under conditions that induce maximal stimulation. While other studies document abnormal Con A induced suppressor cell function in SLE, this study shows that normal functioning populations of SLE-suppressor T cells exist in the peripheral blood.