RT Journal A1 Ganguli R, Rabin BS T1 INcreased serum interleukin 2 receptor concentration in schizophrenic and brain-damaged subjects JF Archives of General Psychiatry JO Archives of General Psychiatry YR 1989 FD March 1 VO 46 IS 3 SP 292 OP 292 DO 10.1001/archpsyc.1989.01810030098018 UL http://dx.doi.org/10.1001/archpsyc.1989.01810030098018 AB To the Editor.—  It has been suggested that autoimmunity may play a role in the pathogenesis of symptoms in some schizophrenics.1,2 Activation of the immune system by an ongoing autoimmune disease is associated with measurable alterations in T-lymphocyte function. In patients with an autoimmune disease, T lymphocytes have a decreased response to nonspecific mitogenic stimulation and produce reduced amounts of interleukin 2 (IL-2).3-5 As IL-2 is necessary for T lymphocytes to respond in a normal manner to nonspecific mitogens, the reduced mitogenic activity may reflect low IL-2 production by the T cells.Recently it has been suggested that the low lymphocyte production of IL-2 in patients with an autoimmune disease occurs because the T cells are activated and the lymphocyte-derived IL-2 has been released into the serum.6 Alternatively, the IL-2 released from lymphocytes may be bound by soluble IL-2 receptor (IL-2R) released from the cell surface. If