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Related Experiment Videos

Factor Xa inactivation by a heparinized hydrogel.

G Rollason, M V Sefton

    Thrombosis Research
    |November 15, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Immobilized heparin in polyvinyl alcohol (PVA) hydrogel beads reduced Factor Xa activity. This heparinized hydrogel showed 1% apparent activity, with diffusion limiting enzyme access to the immobilized heparin.

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    Area of Science:

    • Biochemistry
    • Materials Science
    • Biomaterials

    Background:

    • Heparin is a potent anticoagulant that inhibits coagulation factors.
    • Immobilization of heparin onto materials can create functional biomaterials for various applications.
    • Understanding the activity of immobilized heparin is crucial for designing effective anticoagulant therapies.

    Purpose of the Study:

    • To investigate the anticoagulant activity of heparin immobilized on polyvinyl alcohol (PVA) hydrogel beads.
    • To assess the impact of immobilization on heparin's ability to inhibit Factor Xa.
    • To compare the binding affinities of Factor Xa and antithrombin III to immobilized heparin.

    Main Methods:

    • Incubation of Factor Xa and plasma with heparin-PVA hydrogel beads.

    Related Experiment Videos

  • Measurement of Factor Xa activity using clotting time and chromogenic substrate assays.
  • Assessment of adsorbed Factor Xa activity after exposure to antithrombin III.

    • Main Results:

    • Heparin-PVA hydrogel beads significantly reduced Factor Xa activity.
    • Immobilized heparin exhibited approximately 1% of the apparent activity of heparin in solution.
    • Diffusion effects within the hydrogel beads limited enzyme accessibility to immobilized heparin.
    • Factor Xa and antithrombin III showed similar binding affinities to immobilized heparin, unlike thrombin.

    Conclusions:

    • Heparin immobilization on PVA hydrogel beads retains partial anticoagulant activity.
    • Diffusion limitations in hydrogel matrices can affect the efficacy of immobilized heparin.
    • The binding characteristics of Factor Xa and antithrombin III to immobilized heparin differ from those of thrombin.