Elevated Levels of Soluble Interleukin 2 Receptors in Schizophrenia

To the Editor — Immunologic factors have been implicated in both the cause Levels of soluble interleukin 2 (IL-2) receptor in the serum of schizophrenic patients and healthy controls. Soluble IL-2 receptors were measured by a sandwich enzymelinked immunosorbent assay as previously described. 7 Each point represents the value for one subject; 1 U is approximately 3 pg of soluble IL-2 receptor. Schizophrenic patients (N = 30) were diagnosed using DSMIII and Research Diagnostic Criteria. The horizontal line indicates 2 SDs above the mean value for healthy controls; asterisk, P 1 Problems in demonstrating consistent immunologic stigmata in schizophrenia may