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Related Experiment Videos

A sensitive and specific assay for plasminogen activators.

D S Smith, J Harmon, W G Owen

    Thrombosis Research
    |February 15, 1985
    PubMed
    Summary
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    A new assay accurately detects plasminogen activators using fluorescein-labeled fibrinogen. This method distinguishes tissue-type plasminogen activator (tPA) and urokinase-type plasminogen activator (uPA), crucial for understanding fibrinolysis.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Assay Development

    Background:

    • Plasminogen activators (PAs) are critical enzymes in fibrinolysis.
    • Differentiating between tissue-type PA (tPA) and urokinase-type PA (uPA) is essential for clinical and research applications.
    • Existing assays may lack sensitivity, specificity, or the ability to simultaneously assess reaction dependencies.

    Purpose of the Study:

    • To develop a simple, sensitive, and specific assay for quantifying plasminogen activators.
    • To enable simultaneous evaluation of plasminogen and fibrin dependence for activator discrimination.
    • To differentiate between tPA, uPA, and non-specific proteolysis.

    Main Methods:

    • Utilized fluorescein-labeled fibrinogen or fibrin at low concentrations.

    Related Experiment Videos

  • Assay involves adding specimen and thrombin to a reagent containing plasminogen and labeled fibrinogen.
  • Supernatant fluorescence is measured, which is proportional to plasminogen activator concentration.

    • Main Results:

    • The assay demonstrated high sensitivity, detecting 1 milliunit (14 pg) of tPA or 2 milliunits (36 pg) of uPA within a four-hour incubation.
    • Simultaneous evaluation of plasminogen and fibrin dependence allowed discrimination between tPA and uPA.
    • Addition of antisera confirmed the identification of specific activator species.

    Conclusions:

    • A novel, sensitive, and specific assay for plasminogen activators has been developed.
    • The assay effectively distinguishes between tPA and uPA based on their reaction dependencies.
    • This method offers a valuable tool for studying fibrinolysis and related pathologies.