title: The role of interleukin-1 receptor-associated kinases in Vogt-Koyanagi-Harada disease.
abstract: OBJECTIVE
  To explore whether IRAK1 and IRAK4 are involved in the pathogenesis of Vogt-Koyanagi-Harada (VKH) disease.
  
  
  METHODS
  Thirty-nine VKH patients and thirty-two healthy controls were included in this study. The mRNA levels of IRAK1 and IRAK4 from active VKH patients, inactive VKH patients, and normal controls in peripheral blood mononuclear cells (PBMCs) were detected using real-time quantitative PCR. CD4(+)T cells were purified from PBMCs obtained from active VKH patients and normal controls. The effect of IRAK1/4 inhibition on CD4(+)T cell proliferation following stimulation with IL-18 or IL-1β was measured using a modified MTT assay. CD4(+)T cell expression of IFN-γ and IL-17 were detected by flow cytometry (FCM) and enzyme-linked immunosorbent assay (ELISA). The effect of IRAK1/4 inhibition on NF-κB, STAT1, and STAT3 activation was detected by FCM.
  
  
  RESULTS
  The mRNA levels of IRAK1 and IRAK4 were both significantly increased in active VKH patients compared to inactive VKH patients and healthy controls. No difference in the IRAK1 or IRAK4 mRNA level could be detected between inactive patients and healthy controls. After incubation with IRAK1/4 inhibitor, the proliferation of CD4(+)T cells was inhibited both in the active VKH patients and in the healthy controls. IRAK1/4 inhibition was also associated with a decreased expression of IFN-γ and IL-17. Phosphorylation of NF-κB, STAT1, and STAT3 in CD4(+)T from healthy controls was significantly decreased after inhibition of IRAK1/4.
  
  
  CONCLUSIONS
  High mRNA levels of IRAK1 and IRAK4 correlated with VKH disease activity. IRAK1 and IRAK4 play a role in the activation and proliferation of CD4(+)T cells and the higher expression observed in VKH may contribute to the pathogenesis of this blinding condition.
authors.affiliation: Department of Ophthalmology, Research Institute of Surgery & Daping Hospital, Third Military Medical University, Chongqing, P.R. China; The First Affiliated Hospital, Chongqing Medical University, Chongqing Key Laboratory of Ophthalmology, Chongqing Eye Institute, Chongqing, P. R. China.
authors.forename: Min
authors.initials: M
authors.lastname: Sun
authors.affiliation: The First Affiliated Hospital, Chongqing Medical University, Chongqing Key Laboratory of Ophthalmology, Chongqing Eye Institute, Chongqing, P. R. China.
authors.forename: Peizeng
authors.initials: P
authors.lastname: Yang
authors.affiliation: The First Affiliated Hospital, Chongqing Medical University, Chongqing Key Laboratory of Ophthalmology, Chongqing Eye Institute, Chongqing, P. R. China.
authors.forename: Liping
authors.initials: L
authors.lastname: Du
authors.affiliation: The First Affiliated Hospital, Chongqing Medical University, Chongqing Key Laboratory of Ophthalmology, Chongqing Eye Institute, Chongqing, P. R. China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Department of Ophthalmology, Research Institute of Surgery & Daping Hospital, Third Military Medical University, Chongqing, P.R. China.
authors.forename: Jian
authors.initials: J
authors.lastname: Ye
mesh_terms: D000328:Adult; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D018791:CD4 Lymphocyte Count; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology / Q000378:metabolism; D016022:Case-Control Studies; D005260:Female; D015870:Gene Expression; D006801:Humans; D007371:Interferon-gamma / Q000235:genetics / Q000378:metabolism; D053592:Interleukin-1 Receptor-Associated Kinases / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D020381:Interleukin-17 / Q000235:genetics / Q000378:metabolism; D007963:Leukocytes, Mononuclear / Q000187:drug effects / Q000378:metabolism; D008213:Lymphocyte Activation / Q000187:drug effects / Q000276:immunology; D008297:Male; D008875:Middle Aged; D016328:NF-kappa B / Q000378:metabolism; D012333:RNA, Messenger; D050794:STAT1 Transcription Factor / Q000378:metabolism; D050796:STAT3 Transcription Factor / Q000378:metabolism; D014607:Uveomeningoencephalitic Syndrome / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D055815:Young Adult
chemical_list: D000911:Antibodies, Monoclonal; D020381:Interleukin-17; D016328:NF-kappa B; D012333:RNA, Messenger; D050794:STAT1 Transcription Factor; D050796:STAT3 Transcription Factor; D007371:Interferon-gamma; C507773:IRAK4 protein, human; D053592:Interleukin-1 Receptor-Associated Kinases