Effect of heparin on the inhibition of the contact system enzymes.

Abstract:

:1. One can accurately predict the contribution of each inhibitor to the total inactivation of an enzyme in plasma once its pseudo-first-order reaction rate constant and concentration are known. 2. Because the mechanism of augmentation of the inactivation rate of an enzyme by ATIII occurs via formation of an ATIII-heparin complex, the degree of potentiation can be predicted by knowing the binding capacity (sites per mole) of the heparin preparation and the concentration of heparin in the reaction (to calculate the concentration of the ATIII-heparin complex). 3. The augmentation by heparin of the inactivation rate of a particular enzyme by ATIII is dependent upon the presence of other enzymes with higher kassoc, since these would strongly compete for the ATIII-heparin complex. 4. In a plasma environment, using therapeutic levels of heparin, there is no augmentation of the inactivation rate of any of the contact enzymes.

journal_name

Ann N Y Acad Sci

authors

Colman RW,Scott CF,Pixley RA,de la Cadena RA

doi

10.1111/j.1749-6632.1989.tb22493.x

subject

Has Abstract

pub_date

1989-01-01 00:00:00

pages

95-103

eissn

0077-8923

issn

1749-6632

journal_volume

556

pub_type

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