Abstract
Several studies have examined levels of proinflammatory cytokines, such as tumor necrosis factor (TNF)-α, interleukin (IL)-1β, and IL-6. This meta-analysis was conducted to examine the association between obsessive-compulsive disorder (OCD) and plasma serum levels of proinflammatory cytokines. Twelve studies met inclusion criteria. The meta-analysis demonstrated a significant reduction in IL-1β levels in OCD. No significant difference in plasma levels of IL-6 or TNF-α was demonstrated. Stratified subgroup analysis revealed possible moderating effects of age and medication use on IL-6 levels. Studies including children on psychotropic medication had lower plasma IL-6 levels. Stratified subgroup analysis revealed a moderating effect of comorbid depression on TNF-α levels. Elevated TNF-α levels were reported in studies that included individuals with comorbid depression. Future studies examining immune function in OCD should adjust for potential confounding due to medication use and comorbid depression. Further studies assessing cerebrospinal fluid cytokine levels in OCD are also needed.
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Acknowledgments
The authors acknowledge the National Institute of Mental Health support of the Yale Child Study Center Research Training Program (Dr. Bloch), the National Institutes of Health (NIH) 1K23MH091240 (Dr. Bloch), the APIRE/Eli Lilly Psychiatric Research Fellowship (Dr. Bloch), the AACAP/Eli Lilly Junior Investigator Award (Dr. Bloch), the Trichotillomania Learning Center (Dr. Bloch), NARSAD (Dr. Bloch), and UL1 RR024139 from the National Center for Research Resources, a component of the NIH, and NIH roadmap for Medical Research (Dr. Bloch).
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Gray, S.M., Bloch, M.H. Systematic Review of Proinflammatory Cytokines in Obsessive-Compulsive Disorder. Curr Psychiatry Rep 14, 220–228 (2012). https://doi.org/10.1007/s11920-012-0272-0
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DOI: https://doi.org/10.1007/s11920-012-0272-0