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Related Experiment Videos

Platelet-derived VWF-cleaving metalloprotease ADAMTS-13.

L Liu1, H Choi, A Bernardo

  • 1Department of Medicine, Thrombosis Research Section, Baylor College of Medicine, Houston, TX 77030, USA.

Journal of Thrombosis and Haemostasis : JTH
|September 24, 2005
PubMed
Summary
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Platelets contain active ADAMTS-13, an enzyme that cleaves ultra-large von Willebrand factor (ULVW F) multimers. This intrinsic platelet activity may prevent the release of hyperactive ULVWF, acting as a secondary source of ADAMTS-13.

Area of Science:

  • Hematology
  • Molecular Biology
  • Biochemistry

Background:

  • Von Willebrand factor (VWF) is crucial for platelet adhesion and aggregation.
  • Ultra-large VWF (ULVW F) multimers, found in both endothelial cells and platelets, are hyperactive in platelet aggregation.
  • Platelets are known to store VWF, but the presence and function of VWF-cleaving protease ADAMTS-13 within platelets were unclear.

Purpose of the Study:

  • To investigate the presence and functional activity of ADAMTS-13 in platelets.
  • To determine if platelet-derived ADAMTS-13 can cleave ultra-large VWF (ULVW F).
  • To explore the physiological significance of platelet ADAMTS-13 in regulating ULVWF activity.

Main Methods:

  • Analysis of platelet lysates for VWF-cleaving activity using EDTA and ADAMTS-13 antibodies.

Related Experiment Videos

  • Detection of ADAMTS-13 in platelet lysates and on the platelet surface via antibody staining.
  • Assessment of ADAMTS-13 surface expression on platelets activated by thrombin receptor-activating peptide (TRAP) and ADP.

    • Main Results:

    • Platelet lysates demonstrated the ability to cleave endothelial cell-derived ULVWF under static and flow conditions.
    • This VWF-cleaving activity was inhibited by EDTA and an ADAMTS-13 antibody, confirming the role of ADAMTS-13.
    • ADAMTS-13 was detected in platelet lysates and on the platelet surface, with increased surface expression upon TRAP activation.

    Conclusions:

    • Platelets contain functionally active ADAMTS-13, capable of cleaving ULVWF.
    • Platelet-derived ADAMTS-13 may serve as a critical intrinsic mechanism to control the release of hyperactive ULVWF.
    • This represents a second pool of ADAMTS-13, complementing the plasma enzyme in managing ULVWF released from endothelial cells.