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Related Experiment Videos

A standardized bioassay for platelet factor 3 released by kaolin.

J L Pérez-Requejo

    British Journal of Haematology
    |May 1, 1976
    PubMed
    Summary

    This study modified a platelet factor 3 (PF3) assay for bioassays, finding it measures platelet activity distinct from tissue factor. Aspirin significantly reduced PF3 release in vivo.

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    Thrombosis research·1993

    Area of Science:

    • Hematology
    • Biotechnology
    • Pharmacology

    Background:

    • The original Hardisty & Hutton (1975) assay for platelet factor 3 (PF3) lacked standardization for bioassays.
    • Distinguishing platelet factor activity from tissue factor activity is crucial for accurate thromboplastin assays.
    • Standardization requires controlling for variations in other clotting factors present in plasma.

    Purpose of the Study:

    • To modify the PF3 assay for parallel-line bioassay design.
    • To establish an arbitrary unit of activity using Manchester Comparative Thromboplastin as a standard.
    • To investigate the nature of platelet activity measured and the effect of aspirin on PF3 release.

    Main Methods:

    • Modified the PF3 assay for parallel-line bioassay design using Manchester Comparative Thromboplastin as the standard.
    • Tested platelet-rich plasma diluted in standardized plasma and fibrinogen mixture.
    • Assessed PF3 release via sonication and freeze-thaw cycles, and in vivo aspirin administration.

    Main Results:

    • The modified assay allows for an arbitrary unit of PF3 activity.
    • Experiments indicated that the measured platelet activity differs from tissue factor activity.
    • In vivo, a 600 mg aspirin dose halved PF3 release within 2 hours, with recovery in 5-8 days.

    Conclusions:

    • The modified bioassay provides a standardized method for measuring PF3 activity.
    • The assay differentiates platelet-derived activity from tissue factor.
    • Aspirin demonstrates a significant, reversible inhibitory effect on in vivo PF3 release.

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