Journal
JOURNAL OF AFFECTIVE DISORDERS
Volume 182, Issue -, Pages 106-114Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jad.2015.04.044
Keywords
Depression; Schizophrenia; Interleukin; TNF alpha; Inflammation
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Major depressive disorder (MDD) and schizophrenia are associated with inflammatory processes. Studies have shown that these disorders exhibit increase in the level of one or more proinflammatory markers. However, these studies did not exclude patients with obvious inflammation (i.e., CRP > 6 mg/L). Therefore, a comprehensive study should include those inflammatory disorders. In the present study, the inflammatory natures of MDD and schizophrenia were investigated. To achieve this goal, serum levels of interleukin-6 (IL-6), interleukin-18 (IL-18), tumor necrosis factor alpha (TNR alpha.), and soluble interleukin 2 receptor (sIL-2R) in depressed and schizophrenic patients were obtained and compared with those of the control group. Results showed a significant increase (p < 0.05) in serum levels of IL-6, IL-18, TNF alpha, and sIL-2R in MDD and schizophrenic patients compared with the control group. Also patients with schizophrenia group showed higher levels of the inflammatory markers than MDD and control groups. The current study concluded that the immunological response in the MDD and schizophrenic patients groups was significantly stimulated. These disorders may be considered an inflammatory disorder because of elevated levels of proinflammatory cytokines in spite of lacking an overt inflammation. Furthermore results of this study suggested the possibility of the use of anti-inflammatory drugs as adjuvant therapy in schizophrenic and depressive disorders. (C) 2015 Elsevier B.V. All rights reserved.
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