title: Relationship between alpha 1-antitrypsin inactivation and tumor necrosis factor alpha concentration in the synovial fluid of patients with rheumatoid arthritis.
abstract: OBJECTIVE
  To examine the relationship between alpha 1-antitrypsin (alpha 1AT) specific activity and tumor necrosis factor alpha (TNF alpha) concentration in synovial fluid from 48 patients with rheumatoid arthritis.
  
  
  METHODS
  The specific activity of alpha 1AT was calculated from the measurement of alpha 1AT concentration (by rocket immunoelectrophoresis) and elastase inhibitory capacity. TNF alpha was detected by enzyme-linked immunosorbent assay.
  
  
  RESULTS
  TNF alpha concentrations correlated with the extent of alpha 1AT inactivation.
  
  
  CONCLUSIONS
  Our findings are consistent with a role of elastase in TNF alpha release within the inflamed joint.
authors.affiliation: London Hospital Medical College, University of London, UK.
authors.forename: K
authors.initials: K
authors.lastname: Chidwick
authors.forename: C E
authors.initials: CE
authors.lastname: Whichelow
authors.forename: Z
authors.initials: Z
authors.lastname: Zhang
authors.forename: K
authors.initials: K
authors.lastname: Fairburn
authors.forename: J A
authors.initials: JA
authors.lastname: Sachs
authors.forename: D R
authors.initials: DR
authors.lastname: Blake
authors.forename: P G
authors.initials: PG
authors.lastname: Winyard
mesh_terms: D001172:Arthritis, Rheumatoid / Q000378:metabolism*; D004789:Enzyme Activation; D006801:Humans; D007371:Interferon-gamma / Q000032:analysis; D007719:Knee Joint; D008233:Lymphotoxin-alpha / Q000032:analysis; D013582:Synovial Fluid / Q000737:chemistry*; D014409:Tumor Necrosis Factor-alpha / Q000032:analysis*; D000515:alpha 1-Antitrypsin / Q000378:metabolism*
chemical_list: D008233:Lymphotoxin-alpha; D014409:Tumor Necrosis Factor-alpha; D000515:alpha 1-Antitrypsin; D007371:Interferon-gamma