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Platelets, foreign surfaces, and heparin

R M Lindsay, J Rourke, B Reid

    Transactions - American Society for Artificial Internal Organs
    |January 1, 1976
    PubMed
    Summary
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    Heparin exhibits dual effects on platelet-foreign surface interactions, increasing platelet retention directly but decreasing it on surfaces. This suggests surface modification should consider heparin's antiplatelet impact.

    Area of Science:

    • Biomaterials Science
    • Hematology
    • Surface Chemistry

    Background:

    • Heparin is widely used to modify biomaterial surfaces to reduce thrombogenicity.
    • Understanding heparin's precise interactions with platelets and surfaces is crucial for developing effective blood-contacting devices.

    Purpose of the Study:

    • To investigate the dual, antagonistic effects of heparin on platelet-foreign surface interactions.
    • To evaluate the role of heparin leaching in surface-induced thrombogenicity.

    Main Methods:

    • In vitro studies examining heparin's direct effects on platelets.
    • Assessment of heparin's influence on platelet retention on foreign surfaces.
    • Investigation into the potential for heparin to leach from modified surfaces.

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    Main Results:

    • Heparin demonstrates opposing actions: it increases platelet retention directly on platelets.
    • Heparin reduces platelet retention on foreign surfaces, possibly by competing for cationic sites.
    • Evidence suggests heparin leaching is unlikely to be the primary mechanism for reduced surface thrombogenicity.

    Conclusions:

    • Heparin's surface modification benefits stem from its direct antiplatelet effects rather than leaching.
    • Future research on heparin bonding and surface modification must account for the antiplatelet activity.
    • In vitro antiplatelet assays are valuable for studying surface modification strategies.