Abstract
Although peripheral low-grade inflammation and brain-derived neurotrophic factor (BDNF) levels have been implicated in schizophrenia (SCZ), the interactions between them remain to be fully revealed. We aimed to compare BDNF and cytokines in patients with SCZ and healthy controls (HC). Additionally, we aimed to investigate the association between peripheral levels of cytokines and BDNF in patients with SCZ. Plasma levels of BDNF, interferon gamma, interleukin (IL)-10, IL-12, IL-1, IL-6, IL-8, tumor necrosis factor alpha, macrophage migration inhibitory factor, IL-1 receptor antagonist (IL-1Ra), and CD40 Ligand were compared in 45 SCZ patients and 38 HC using Luminex technology. Compared to HC, patients had significantly higher IL-1Ra levels (P = 0.031). We found a strong positive association between BDNF and CD40 Ligand in the patient group (rho = 0.858, P < 0.001) as well as in the HC group (rho = 0.822, P < 0.001), respectively. Furthermore, there was a negative association between BDNF and tumor necrosis factor alpha in patients (rho = -0.429, P = 0.030) as well as in HC (rho = -0.649, P < 0.001). These results suggest that the cytokine IL-1Ra may play a role in SCZ pathophysiology. Additionally, the interaction between cytokines and BDNF levels further indicated the diverse actions of these cytokines.
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