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Related Experiment Videos

A platelet procoagulant activity associated with platelet shape change.

M Ehrman, E Toth, M Frojmovic

    The Journal of Laboratory and Clinical Medicine
    |September 1, 1978
    PubMed
    Summary

    Platelet shape change, not aggregation, is essential for developing platelet aggregation (PCA). This shape change significantly shortens plasma recalcification times, indicating its role in blood clotting.

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    Area of Science:

    • Hematology
    • Biochemistry

    Background:

    • Platelet aggregation (PCA) is crucial for hemostasis.
    • The precise mechanisms initiating PCA, particularly the role of platelet shape change, require further elucidation.

    Purpose of the Study:

    • To investigate the necessity and sufficiency of platelet shape change in developing PCA.
    • To differentiate PCA induced by shape change from other platelet activation pathways.

    Main Methods:

    • Assaying recalcification times in human platelet-rich plasma (PRP) using light transmission.
    • Measuring platelet morphology and aggregation via light microscopy and photometry.
    • Utilizing adenosine diphosphate (ADP) to induce shape change and aggregation.

    Main Results:

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  • Induced platelet shape change, independent of aggregation, is necessary and sufficient for PCA development.
  • Shape-changed platelets shortened recalcification times by approximately 50%.
  • Aspirin did not impair PCA development, while 5'-adenosine monophosphate inhibited it by 80-90%.

    • Conclusions:

    • Platelet shape change is a key initiator of PCA.
    • This PCA is reversible and distinct from other platelet-derived factors.
    • Platelet shape change may regulate coagulation factor binding to the platelet membrane.