title: Influence of IL13 on Periostin Secretion by Synoviocytes in Osteoarthritis.
abstract: Our previous research provided evidence of periostin increase in parallel with interleukin-13 (IL13) increase in the synovial fluid of patients with osteoarthritis (OA). The reaction cascade from IL13 to periostin, however, remains unidentified. We, therefore, tested the hypothesis that periostin secretion is affected downstream of IL13.
  
  
  
  OA synoviocytes were cultured under different concentrations of IL13. Periostin content in culture supernatants and the level of signal transducer and activator of transcription 6 (STAT6) in the cultured cells were measured using enzyme-linked immunosorbent assay (ELISA). Moreover, the influence of dexamethasone and leflunomide on periostin production in relation to the effect of IL13 on the cells was also examined.
  
  
  
  Periostin content in culture supernatants and the level of STAT6 in cultured cells were significantly increased by IL13. The increase of periostin was significantly inhibited by dexamethasone and leflunomide.
  
  
  
  Periostin may be up-regulated in OA synoviocytes via STAT6 downstream of IL13.
authors.affiliation: Department of Physiology, School of Medicine, Showa University, Tokyo, Japan.
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Moue
authors.affiliation: Department of Physiology, School of Medicine, Showa University, Tokyo, Japan.
authors.forename: Yutaro
authors.initials: Y
authors.lastname: Tajika
authors.affiliation: Department of Physiology, School of Medicine, Showa University, Tokyo, Japan s-ishikawa@med.showa-u.ac.jp.
authors.forename: Shintaro
authors.initials: S
authors.lastname: Ishikawa
authors.affiliation: Department of Physiology, School of Medicine, Showa University, Tokyo, Japan.
authors.forename: Yasuaki
authors.initials: Y
authors.lastname: Kanada
authors.affiliation: Department of Physiology, School of Medicine, Showa University, Tokyo, Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Okumo
authors.affiliation: Department of Physiology, School of Medicine, Showa University, Tokyo, Japan.
authors.forename: Kazuhito
authors.initials: K
authors.lastname: Asano
authors.affiliation: Department of Physiology, School of Medicine, Showa University, Tokyo, Japan.
authors.forename: Tadashi
authors.initials: T
authors.lastname: Hisamitsu
mesh_terms: D015815:Cell Adhesion Molecules / Q000235:genetics / Q000378:metabolism*; D002478:Cells, Cultured; D004797:Enzyme-Linked Immunosorbent Assay; D005786:Gene Expression Regulation / Q000187:drug effects*; D006801:Humans; D018793:Interleukin-13 / Q000494:pharmacology*; D010003:Osteoarthritis / Q000188:drug therapy / Q000235:genetics / Q000378:metabolism*; D060888:Real-Time Polymerase Chain Reaction; D020133:Reverse Transcriptase Polymerase Chain Reaction; D050800:STAT6 Transcription Factor / Q000378:metabolism; D000070918:Synoviocytes / Q000187:drug effects / Q000378:metabolism*
chemical_list: D015815:Cell Adhesion Molecules; D018793:Interleukin-13; C512835:POSTN protein, human; D050800:STAT6 Transcription Factor; C494101:STAT6 protein, human
keywords: IL13; Knee osteoarthritis; STAT6; interleukin-13; periostin; signal transducer and activator of transcription 6