[Identity of human granulocyte kininogenase and plasminogen activator]

Preparative isoelectrofocusing used for fractionating the whole human granulocyte lysate serine proteinases revealed multiple forms of elastase, cathepsin G, kininogenase, human granulocytes plasminogen activator (pI 6.2-10.75). Kinetic characteristics of their substrate specificity were also obtained. It is shown that serine kininogenase of human granulocytes is not identical with elastase as it had been supposed before, it is of trypsin-like nature and is identical with plasminogen activator of these cells. The results obtained reveal new aspects in comprehension of the role of the granulocyte plasminogen activator in development of the inflammatory reaction. It is found that acid-stable proteinase inhibitors formed from blood plasma inter-alpha-inhibitor of trypsin, have an inhibitory effect on the granulocyte plasminogen activator, that supports an assumption on the anti-inflammatory function of these inhibitors.