Summary
Cancer-related fibrin deposition and fibrinolysis were investigated by two-dimensional
gel electrophoresis of human solid tumor and effusion specimen in addition to plasma
samples. Fibrinogen gamma-chain dimer indicating fibrin deposition and plasmin-generated
fibrinogen beta-chain fragments were identified in various solid tumor types by amino
acid sequencing, mass spectrometry analysis and Western blotting. In tumor-associated
effusions, these techniques allowed to observe plasmin-generated fragments of fibrinogen
alpha, beta and gamma-chains in addition to elevated levels of acute-phase proteins.
Similar observations were made in case of inflammation-associated effusions. No fibrin
degradation product was observed in plasma samples, however, high amounts of fibrinogen
gamma-chain dimer crosslinked by transglutaminase were detected in plasma from tumor
patients, but not in plasma from controls and patients suffering acute infections
and/or inflammations. This finding demonstrated that high transglutaminase activity
may be associated with cancer. The presented data indicate that the amount of crosslinked
fibrinogen gamma-chain dimer in plasma may correlate with tumor-associated fibrin
deposition. The tumor-biological relevance of this potential marker protein is discussed.
Keywords
Cancer - fibrin deposition - fibrinolysis - plasma proteins - two-dimensional gel
electrophoresis