An enzyme immunoassay for polymorphonuclear leucocyte-mediated fibrinogenolysis

Eur J Clin Invest. 1997 Feb;27(2):148-56. doi: 10.1046/j.1365-2362.1997.810634.x.


Upon stimulation, polymorphonuclear leucocytes (PMNs) release potent serine proteases, i.e. elastase, cathepsin G and proteinase 3, which contribute to the degradation of tissue and plasma components. Here, we describe the development of a plasma test to assess PMN-mediated fibrinogenolysis as a biochemical marker for actual PMN-derived proteolysis in vivo, useful for monitoring therapeutic efficacy, i.e. of elastase inhibitors. We generated a monoclonal antibody (MAb), designated 1-1/B3, with a high affinity for elastase-degraded fibrinogen (EDF). The epitope for 1-1/B3 becomes exposed in a time-dependent manner during digestion of fibrinogen with purified PMN-derived serine proteases and with isolated PMNs in vitro. However, 1-1/B3 does not react with plasma fibrinogen or with fibrin(ogen) degradation products generated by plasmin or by other active proteases that may occur locally, i.e. metalloproteases and lysosomal cathepsins. On the basis of MAb 1-1/B3, we developed a plasma test for the assessment of PMN-mediated fibrin(ogen) degradation products (PMN-FDP). In a panel of control plasmas, we observed concentrations of PMN-FDP of 8.2 +/- 0.9 ng mL-1 (n = 18). These values were increased twofold in patients with alpha 1-proteinase inhibitor deficiency (18.6 +/- 3.3 ng mL-1; n = 12; P < 0.0001) and even more in patients with sepsis (365.7 +/- 97.7 ng mL-1; n = 16; P < 0.0001). Furthermore, synovial tissue extracts from patients with rheumatoid arthritis contained increased levels of PMN-FDP, compared with synovial tissue extracts (P < 0.005) from patients with osteoarthritis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antibodies, Monoclonal / chemistry
  • Antibodies, Monoclonal / isolation & purification
  • Antibodies, Monoclonal / metabolism
  • Antibody Specificity
  • Enzyme-Linked Immunosorbent Assay / methods*
  • Enzyme-Linked Immunosorbent Assay / statistics & numerical data
  • Fibrin Fibrinogen Degradation Products / chemistry
  • Fibrin Fibrinogen Degradation Products / immunology
  • Fibrin Fibrinogen Degradation Products / metabolism*
  • Fibrinogen / chemistry
  • Fibrinogen / immunology*
  • Fibrinogen / metabolism
  • Fibrinolysis / immunology
  • Fibrinolysis / physiology*
  • Humans
  • Leukocyte Elastase / metabolism
  • Neutrophils / metabolism*
  • Neutrophils / physiology
  • Serine Endopeptidases / metabolism


  • Antibodies, Monoclonal
  • Fibrin Fibrinogen Degradation Products
  • Fibrinogen
  • Serine Endopeptidases
  • Leukocyte Elastase