Ulinastatin is a remedy of urine serinprotease inhibitors and also it inhibits enzymatic activities of several blood coagulation factors. The action of ulinastatin on alpha-thrombin shows noncompetitive inhibition with the formation of enzyme-inhibitor complex. In this study, the effects of ulinastatin on the alpha-thrombin activation of factors V and VIII are observed by 5-20% gradient gel SDS PAGE with or without Western blotting method. The addition of ulinastatin to the mixture of factor V and alpha-thrombin inhibits the production of active peptides proceeded in the alpha-thrombin activation process of factor V. Furthermore, using anti-factor VIII 43KDa peptide monoclonal antibody with Western blotting method, the addition of ulinastatin to the mixture of alpha-thrombin and factor VIII indicates to inhibit the release of 43KDa peptide from factor VIII in the process of factor VIII activation induced by alpha-thrombin.
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