Alterations in the autologous mixed lymphocyte reaction (autologous MLR) have been reported in many autoimmune diseases and in diseases with a derangement of T regulatory function. We have studied autologous MLR in 10 patients with idiopathic autoimmune hemolytic anemia (IAHA). All patients had decreased autologous MLR which averaged 4,106 +/- 1,332 cpm (SEM) compared to 12,153 +/- 4,166 cpm for simultaneously studied controls. A marked decrease in phytohemagglutinin response and an imbalance of T-cell subsets were also observed. These findings suggest a possible abnormality of T immunoregulatory function in IAHA patients.
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