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Related Experiment Videos

A simplified PTT-based protein C activity assay using the thrombin-thrombomodulin complex.

R B Francis

    Thrombosis Research
    |February 1, 1986
    PubMed
    Summary

    A new assay simplifies measuring protein C activity in plasma. This method accurately quantines protein C, unaffected by other factors, making it suitable for various patient types.

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    Area of Science:

    • Biochemistry
    • Hematology
    • Clinical Diagnostics

    Background:

    • Protein C is a crucial anticoagulant vitamin K-dependent protein.
    • Accurate measurement of protein C activity is essential for diagnosing and managing thrombotic disorders.
    • Existing assays can be complex and influenced by various factors.

    Purpose of the Study:

    • To develop a simplified and reliable assay for measuring protein C activity in plasma.
    • To validate the assay's independence from protein S levels and its suitability for anticoagulated plasma.
    • To assess the assay's specificity for functional protein C and its potential for detecting molecular variants.

    Main Methods:

    • Utilizes rabbit lung thrombomodulin to selectively activate protein C in plasma barium eluates.
    • Employs a mixture of thrombin and thrombomodulin at concentrations that neutralize each other's effect on PTT.
    • Measures protein C anticoagulant activity directly using the kaolin-cephalin activated partial thromboplastin time (PTT).

    Main Results:

    • The assay is independent of protein S levels and effective in warfarinized and heparinized plasma.
    • Results correlate closely with functional vitamin K-dependent procoagulant levels (prothrombin and proconvertin time).
    • Demonstrates specificity for gamma-carboxylated protein C and potential to detect defective molecular variants.

    Conclusions:

    • The described simplified assay provides a robust method for quantifying plasma protein C activity.
    • This assay is suitable for routine clinical use, including in patients on anticoagulant therapy.
    • The method offers potential for identifying individuals with functional protein C deficiencies or molecular defects.

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