Blood, 1958, Vol. 13, No. 8, pp. 811-821.
© 1958 American Society of Hematology, Inc.
The Effect of Heparin on Components of the Human
Fibrinolytic System
KURT N. VON KAULLA 1 and
TOM S. MCDONALD 1
1 Department of Medicine, University of Colorado School of Medicine, and
Belle Bonfils Memorial Blood Bank, Denver.
It was demonstrated with human urokinase, human fibrinolytic euglobulins
and human pyrogen plasma as enzyme source, and with bovine fibrin plates
and human plasma plates as substrate, that high heparin concentrations inhibit fibrinolysis of preformed fibrin, in contrast to small ones which may
enhance this phenomenon, provided albumin is present.
No interference could be observed in the absence of plasma, serum or
albumin fraction. Albumin or substances associated with the albumin fraction
are required for interference of heparin with fibrinolysis. This interference
probably takes place with the action of plasmin on fibrin.
Submitted on May 10, 1957
Accepted on February 15, 1958