title: Plasma levels of tumor necrosis factor-alpha and interleukin-6 in obsessive compulsive disorder.
abstract: OBJECTIVE
  Recent research implicated place of an immune mechanism in the pathophysiology of obsessive-compulsive disorder (OCD). Despite increasing evidence involvement of cytokine release in OCD, results of the studies are inconsistent. The aim of this study was to evaluate the plasma levels of the cytokines; tumor necrosis factor-alpha (TNF-alpha) and interleukin-6 (IL-6) in OCD patients.
  
  
  METHODS
  Plasma concentrations of TNF-alpha and IL-6 were measured in 31 drug-free outpatients with OCD, and 31-year age and sex-matched healthy controls. TNF-alpha and IL-6 concentrations in blood were determined by enzyme-linked immunosorbent assay (ELISA).
  
  
  RESULTS
  Both TNF-alpha and IL-6 levels showed statistically significant increases in OCD patients compared to controls (P < .000, P < .001, resp.). In addition, the age of onset was negatively correlated with TNF-alpha level (r = -.402, P = .025) and duration of illness was weakly correlated with IL-6 levels (r: .357; P: .048) in patients group.
  
  
  CONCLUSIONS
  OCD patients showed increases in TNF-alpha and IL-6 levels compared to the healthy controls. This study provides evidence for alterations in the proinflammatory cytokines which suggest the involvement of the immune system in the pathophysiology of OCD.
authors.affiliation: Department of Psychiatry, Faculty of Medicine, Zonguldak Karaelmas University, 67600 Zonguldak, Turkey.
authors.forename: N
authors.initials: N
authors.lastname: Konuk
authors.forename: I O
authors.initials: IO
authors.lastname: Tekin
authors.forename: U
authors.initials: U
authors.lastname: Ozturk
authors.forename: L
authors.initials: L
authors.lastname: Atik
authors.forename: N
authors.initials: N
authors.lastname: Atasoy
authors.forename: S
authors.initials: S
authors.lastname: Bektas
authors.forename: A
authors.initials: A
authors.lastname: Erdogan
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006801:Humans; D015850:Interleukin-6 / Q000097:blood*; D008297:Male; D009771:Obsessive-Compulsive Disorder / Q000097:blood*; D014409:Tumor Necrosis Factor-alpha / Q000097:blood*
chemical_list: D015850:Interleukin-6; D014409:Tumor Necrosis Factor-alpha