Related Experiment Videos
[Platelet-derived microparticles]
1Department of Pediatrics, Jikei University School of Medicine.
Abstract:
The presence of platelet fragments or platelet-derived microparticles (MP) in blood is of great interest, because it could be used as a marker for increased destruction or activation of platelets followed by their aggregation and vesiculation. In addition to early electronmicroscopic observations, a variety of methods to detect MP in plasma and serum have been developed, including immunoelectrophoresis, radioimmunoassay and the immunofluorescence test using flow cytometric analysis. In these techniques, monoclonal antibodies directed against platelet membrane specific antigens, such as glycoprotein (GP) IIb/IIIa or GP I b, have been used to distinguish platelet microparticles from other components. From basic and clinical investigations, MP has proved to be increased in some physiological and pathological conditions, including blood clotting, thrombin and collagen-induced activation of platelets, mechanical trauma of platelets, and immune-mediated platelet destruction. Furthermore, it has been shown that a significant part of platelet procoagulant activity resides on these small vesicles (MP), released from the platelet plasma membrane, on activation.
Insights
Platelet microparticles (MP) in blood can indicate platelet activation or destruction. These small vesicles carry significant procoagulant activity, making them important markers in various conditions.
Area of Science:
- Hematology
- Biochemistry
- Immunology
Context:
- Platelet-derived microparticles (MP) are small vesicles released from activated or damaged platelets.
- Their presence in circulation is associated with platelet activation, aggregation, and destruction.
- MP play a role in hemostasis and thrombosis due to their procoagulant activity.
Purpose:
- To highlight the significance of platelet microparticles (MP) as potential biomarkers.
- To review methods for detecting MP in blood.
- To discuss the role of MP in physiological and pathological conditions.
Summary:
- MP detection methods include immunoelectrophoresis, radioimmunoassay, and flow cytometry using specific monoclonal antibodies.
- Antibodies targeting platelet-specific antigens like GP IIb/IIIa and GP Ib are used for MP identification.
- Elevated MP levels are observed in conditions such as blood clotting, platelet activation by thrombin or collagen, mechanical trauma, and immune-mediated platelet destruction.
Impact:
- MP are recognized as crucial indicators of platelet status in various clinical settings.
- Understanding MP function is vital for diagnosing and managing thrombotic disorders.
- MP contribute significantly to the procoagulant activity of blood, influencing hemostasis and thrombosis.