Evidence for the occurrence of a fast-acting inhibitor for tissue-type plasminogen activator in human plasma

Thromb Haemost. 1984 Jul 29;51(3):392-5.


Human plasma contains a fast-acting t-PA inhibitor, which is not identical with alpha 2-antiplasmin or alpha 2-macroglobulin. The concentration of this inhibitor in normal plasma is highly variable, much lower than that of known plasma protease inhibitors, and in the range of physiologically occurring plasma concentrations of t-PA (0-2 IU/ml). The inhibitor binds to concanavalin A-Sepharose, is rather stable when heated, is not precipitated in euglobulin fractions and probably does not originate from platelets. The inhibitor seems to form a 190 Kd complex with t-PA. The relation between this plasma inhibitor and the recently discovered endothelial cell inhibitor is not yet clear.

MeSH terms

  • Chromatography, Affinity
  • Electrophoresis, Polyacrylamide Gel
  • Glycoproteins / isolation & purification*
  • Humans
  • Iodine Radioisotopes
  • Kinetics
  • Molecular Weight
  • Plasminogen Activators / antagonists & inhibitors*
  • Plasminogen Inactivators*


  • Glycoproteins
  • Iodine Radioisotopes
  • Plasminogen Inactivators
  • Plasminogen Activators