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Studies of Autologous Mixed Lymphocyte Reactions in Patients with Systemic Lupus Erythematosus

Summary The autologous mixed lymphocyte reaction (AMLR) measures the proliferative response of peripheral blood T cells to surface antigens of non T cells. The AMLR of SLE patients with active or inactive disease either with (13) or without (6) immunosuppressive treatment was low compared with age and sex‐matched controls, confirming previous reports. Only one patient with inactive, untreated SLE and one with drug induced lupus (procainamide) showed normal AMLR. Autologous reactivity was also reduced in 2 patients without treatment who presented with clinically complex disease syndromes, including primary biliary cirrhosis, or polyarteritis nodosa, together with Sjögren's syndrome and serological evidence of lupus. The AMLR could not be increased by changing the ratio of responder to stimulator cells. Patients with decreased AMLR also showed a decreased response to phytohemagglutinin which suggested a general depression of T cells. There was no correlation between the decreased AMLR and age, clinical features or anti‐DNA antibody levels of the patients. In allogeneic mixed lymphocyte reactions (MLR) it was shown that non‐T cells from SLE patients were poorer stimulators of allogeneic T cells than normal cells, and T lymphocytes from SLE patients were poorer responders to allogeneic non‐T cells than were normal T cells. Both effects were much more marked in patients with active disease than in those with inactive SLE. This suggests a defect in both responder and stimulating cell populations in SLE.