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Cytokine, chemokine and BDNF levels in medication-free pediatric patients with obsessive–compulsive disorder

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Abstract

The aim of this study was to investigate whether the serum levels of IL-12, IL-17, TGFβ, TNF-alpha, sTNFR1, sTNFR2, IL-1β, CCL3, CCL24, CXCL8, and BDNF are associated with obsessive–compulsive disorder (OCD) in medication-free children. A total of 44 (22 boys/22 girls) medication-free children with OCD and 40 (23 boys/17 girls) healthy controls were included in this study. The severity of the OCD symptoms were assessed by the Children’s Yale–Brown Obsessive–Compulsive Scale and the Maudsley Obsessive–Compulsive Inventory. The Children’s Depression Inventory and the Screen for Child Anxiety-Related Emotional Disorders were applied to the children in order to determine depression and anxiety levels. IL-17, IL-12, TGF β, TNF-alpha, sTNFR1, sTNFR2, IL-1β, CCL3, CCL24, CXCL8, and BDNF levels were measured by enzyme-linked immunosorbent assay. Multivariate analysis of covariance (MANCOVA) revealed a significant main effect on both groups for the levels of serum cytokine, chemokine, and BDNF, an effect that was independent of severities of depression and anxiety [Pillai’s Trace V = 0.371, F (11, 70) = 3.756, p < 0.001, hp2 = 0.187]. Analysis of covariance (ANCOVA) indicated that serum TNF-alpha levels were significantly higher in the OCD group than in the control group (p < 0.001). In contrast, serum IL-12 levels were significantly lower in the OCD group than in the control group (p = 0.014). These findings suggest that TNF-alpha and IL-12 may play a role in the pathophysiology of OCD in children. The causal relationship between these proinflammatory cytokines and pediatric OCD requires further investigation.

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Acknowledgements

We would like to thank our patients and their parents for taking part in this study. Funding for this study was provided by a grant from the Scientific Research Project Coordination Unit of Necmettin Erbakan University (Project No: 161518001).

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Correspondence to Rukiye Çolak Sivri.

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The study was financially supported by Scientific Research Project Coordination Unit of Necmettin Erbakan University (Project No: 161518001).

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Çolak Sivri, R., Bilgiç, A. & Kılınç, İ. Cytokine, chemokine and BDNF levels in medication-free pediatric patients with obsessive–compulsive disorder. Eur Child Adolesc Psychiatry 27, 977–984 (2018). https://doi.org/10.1007/s00787-017-1099-3

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