title: Zymographic analysis using gelatin-coated film of the effect of etanercept on the extracellular matrix-degrading activity in synovial fluids of rheumatoid arthritis patients.
abstract: OBJECTIVE
  Rheumatoid arthritis (RA) is a chronic inflammatory disease. Most RA patients develop cartilage and bone destruction, and various proteinases are involved in the destruction of extracellular matrix of cartilage and bone. The aim of this study is to evaluate the utility of our newly developed method to measure total gelatinolytic activity. We adopted this method for measurement in synovial fluid from RA patients treated by the anti-rheumatic drug etanercept (ETN), a recombinant human soluble tumor necrosis factor receptor fusion protein, and compared the findings with clinical and laboratory data.
  
  
  METHODS
  Enzymatic activity of synovial fluid was analyzed by zymography using gelatin-coated film, and compared with the index of Disease Activity Score of 28 joints - C-reactive protein (DAS28-CRP), CRP and matrix metalloproteinase (MMP)-3 level before and after ETN therapy.
  
  
  RESULTS
  Synovial fluids of 19 patients were collected before and after administration of ETN therapy. In nine of 19 patients, who showed a decrease in gelatin-degrading activity in synovial fluid, the index of DAS28-CRP (4.85-2.85, ΔDAS = -2.00) and CRP (3.30-0.94 mg/dL, ΔCRP = -2.36) was alleviated after ETN therapy, while cases with no change or an increase in gelatin-degrading activity showed a modest improvement in clinical data: DAS28-CRP (4.23-3.38, ΔDAS = -0.85) and CRP (1.70-0.74 mg/dL, ΔCRP = -0.96).
  
  
  CONCLUSIONS
  Our newly developed method for measurement of gelatin-degrading activity in synovial fluid from RA patients is highly practicable and useful for predicting the effect of ETN therapy.
authors.affiliation: Department of Pathology, Iwate Medical University, Shiwa, Japan.
authors.forename: Akihisa
authors.initials: A
authors.lastname: Kamataki
authors.affiliation: Department of Pathology, Iwate Medical University, Shiwa, Japan.
authors.forename: Mutsuko
authors.initials: M
authors.lastname: Ishida
authors.affiliation: Komagamine Orthopedic and Rheumatology Clinic, Morioka, Japan.
authors.forename: Masataka
authors.initials: M
authors.lastname: Komagamine
authors.affiliation: Yoshida Orthopedic and Rheumatology Clinic, Morioka, Japan.
authors.forename: Masaaki
authors.initials: M
authors.lastname: Yoshida
authors.affiliation: Department of Orthopedic Surgery, Iwate Medical University, Morioka, Japan.
authors.forename: Takanobu
authors.initials: T
authors.lastname: Ando
authors.affiliation: Department of Pathology, Iwate Medical University, Shiwa, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Sawai
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D018501:Antirheumatic Agents / Q000627:therapeutic use*; D001172:Arthritis, Rheumatoid / Q000175:diagnosis / Q000188:drug therapy* / Q000201:enzymology; D015415:Biomarkers / Q000378:metabolism; D002097:C-Reactive Protein / Q000378:metabolism; D057075:Enzyme Assays / Q000379:methods*; D000068800:Etanercept / Q000627:therapeutic use*; D005260:Female; D005780:Gelatin / Q000378:metabolism*; D018093:Gelatinases / Q000378:metabolism*; D006305:Health Status Indicators; D006801:Humans; D018836:Inflammation Mediators / Q000378:metabolism; D008297:Male; D019278:Matrix Metalloproteinase 3 / Q000378:metabolism; D008875:Middle Aged; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D013582:Synovial Fluid / Q000201:enzymology*; D016896:Treatment Outcome
chemical_list: D018501:Antirheumatic Agents; D015415:Biomarkers; D018836:Inflammation Mediators; C015233:gelatin film; D005780:Gelatin; D002097:C-Reactive Protein; D018093:Gelatinases; C511768:MMP3 protein, human; D019278:Matrix Metalloproteinase 3; D000068800:Etanercept
keywords: etanercept; film in situ zymography; gelain-coated film; rheumatoid arthritis