Abstract
Recently, there have been some reports that schizophrenia is accompanied by an immune-inflammatory response, characterized by increased secretion of interleukin-6 (IL-6), soluble IL-2 receptor (sIL-2) and lower plasma levels of CC16 (Clara cell protein), an endogenous anti-cytokine. It was shown that clozapine, an atypical antipsychotic drug, may increase the plasma levels of sIL-2R and pro-inflammatory cytokines. This study was carried out in order to examine serum IL-6, IL-6R, CC16, IL-1R antagonist (IL-1RA), transferrin receptor (TfR) and sCD8 antigen, both before and after treatment with clozapine in schizophrenic subjects versus normal controls. Schizophrenic patients showed significantly higher plasma IL-6R and IL-1RA and lower plasma CC16 than normal controls. Treatment with clozapine significantly increased plasma sCD8, IL-6, CC16 and IL-1RA concentrations. The clozapine-induced increments in plasma IL-6 and CC16 appeared during the first 2 weeks of treatment, whereas the increases in plasma sCD8 and IL-1RA appeared after 5 weeks. Clozapine appears to have complex in vivo immunomodulatory effects.
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