Serum ceruloplasmin-ferroxidase activity in bipolar disorder is elevated compared to major depressive disorder and schizophrenia: a controlled study

OBJECTIVE: In this study, we aimed to study copper metabolism in schizophrenia, bipolar disorder, major depression compared with healthy control. METHODS: This is a single-centered cross-sectional study. The patients with schizophrenia (n = 36), bipolar disorder (n = 37), major depression (n = 40), and healthy control (n = 32) were included in the study. All participants were initially evaluated by a clinical psychiatrist to confirm the appropriate diagnosis using the Structured Clinical Interview for Diagnostic and Statistical Manuel of Mental Disorders-IV (DSM-IV) Axis I Disorders (SCID-I). Serum copper level, ceruloplasmin mass, and ceruloplasmin-ferroxidase activity were measured. One-way ANOVA and Kruskal–Wallis Tests were performed for statistical analyses. RESULTS: Serum ceruloplasmin-ferroxidase activity (χ2 = 9.11, p = 0.028) demonstrated a significant statistical difference in all groups compared with the control group. Serum ceruloplasmin-ferroxidase activity of the bipolar disorder group was significantly higher than the healthy control group (p = 0.012), major depression group (p = 0.027), and the schizophrenia group (p = 0.019). Erythrocyte sedimentation rate (ESR) (p = 0.028) and waist circumference (p = 0.005) in bipolar disorder group, and the C-reactive protein (CRP) (p