title: Establishment of a Rat Adjuvant Arthritis-Interstitial Lung Disease Model.
abstract: BACKGROUND
  Development of an animal model of rheumatoid arthritis-interstitial lung disease (RA-ILD) and improved knowledge of the pathogenesis of RA-ILD may facilitate earlier diagnosis and the development of more effective targeted therapies.
  
  
  METHODS
  Adult male Wistar rats were studied in an adjuvant arthritis (AA) model induced by the injection of Freund's complete adjuvant (FCA). Rats were sacrificed on days 7, 14, 21, and 28 after FCA injection. Lung tissue was obtained for histopathological examination and evaluation of Caveolin-1 (Cav-1) and transforming growth factor-β (TGF-β1) protein expression levels.
  
  
  RESULTS
  Pulmonary inflammation was evident in lung tissue from day 21 after FCA injection. Inflammation and mild fibrosis were observed in lung tissue on day 28 after FCA injection. Cav-1 protein expression was significantly decreased from day 7 through day 28 and TGF-β1 protein expression was significantly increased on day 28 after FCA injection compared to control (P < 0.05).
  
  
  CONCLUSIONS
  We established an AA rat model that exhibited the extra-articular complication of RA-ILD. We identified Cav-1 and TGF-β1 as protein biomarkers of RA-ILD in this model and propose their signaling pathway as a possible target for therapeutic intervention.
authors.affiliation: Department of Rheumatology, The Second Affiliated Hospital of Dalian Medical University, Dalian 116021, China.
authors.forename: Liu-nan
authors.initials: LN
authors.lastname: Song
authors.affiliation: Department of Rheumatology, The Second Affiliated Hospital of Dalian Medical University, Dalian 116021, China.
authors.forename: Xiao-dan
authors.initials: XD
authors.lastname: Kong
authors.affiliation: Department of Rheumatology, The Second Affiliated Hospital of Dalian Medical University, Dalian 116021, China.
authors.forename: Hong-jiang
authors.initials: HJ
authors.lastname: Wang
authors.affiliation: Combination of Chinese Traditional and Western Medicine Lab, Dalian Medical University, Dalian 116044, China.
authors.forename: Li-bin
authors.initials: LB
authors.lastname: Zhan
mesh_terms: D000818:Animals; D001172:Arthritis, Rheumatoid / Q000139:chemically induced / Q000150:complications / Q000235:genetics / Q000473:pathology*; D051242:Caveolin 1 / Q000096:biosynthesis; D004195:Disease Models, Animal; D005620:Freund's Adjuvant / Q000633:toxicity; D006801:Humans; D007249:Inflammation / Q000139:chemically induced / Q000150:complications / Q000235:genetics / Q000473:pathology*; D008168:Lung / Q000378:metabolism / Q000473:pathology; D017563:Lung Diseases, Interstitial / Q000139:chemically induced / Q000150:complications / Q000235:genetics / Q000473:pathology*; D051381:Rats; D053773:Transforming Growth Factor beta1 / Q000096:biosynthesis
chemical_list: C495537:Cav1 protein, rat; D051242:Caveolin 1; C508962:Tgfb1 protein, rat; D053773:Transforming Growth Factor beta1; D005620:Freund's Adjuvant