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Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets
Published on: November 29, 2024
[Effect of platelet on procoagulant activity of monocyte]
1Hemostatic Physiology Laboratory, Xiangya Medical College, Central Southern University, Changsha 410078, China.
Objective:
To investigate the effect of platelet on procoagulant activity of mononcyte(M).
Methods:
The procoagulant activity of M lysates was measured by one stage clotting time assay, the tissue factor (TF) activity and the role of P-selectin were confirmed by specific monoclonal antibodies (McAb).
Results:
1. Activated M challenged by lipopolysaccharide(LPS) had augmented procoagulant activity and this effect was blocked by TF McAb. 2. Procoagulant activity of M and activated M increased significantly with the presence of activated platelets. 3. The enhancement effect of activated platelet on the procoagulant activity of M was blocked by P-selectin McAb.
Conclusion:
TF expression of M contributes to the procoagulant activity of Ms and activated platelet enhances the procoagulant activity via P-selectin.
Insights
Platelets significantly enhance monocyte procoagulant activity, primarily through P-selectin interactions. This effect is mediated by tissue factor expression on monocytes.
Area of Science:
- Hematology
- Immunology
- Cell Biology
Context:
- Monocytes play a crucial role in hemostasis and inflammation.
- Platelet-monocyte interactions are increasingly recognized in thrombotic and inflammatory diseases.
Purpose:
- To elucidate the specific mechanisms by which platelets influence monocyte procoagulant activity.
- To determine the role of tissue factor and P-selectin in this interaction.
Summary:
- Lipopolysaccharide-activated monocytes exhibit increased procoagulant activity, which is blocked by anti-tissue factor antibodies.
- The presence of activated platelets significantly augments the procoagulant activity of both resting and activated monocytes.
- This platelet-mediated enhancement is specifically inhibited by anti-P-selectin antibodies, indicating P-selectin's critical role.
Impact:
- Provides a deeper understanding of the interplay between platelets and monocytes in coagulation.
- Highlights potential therapeutic targets for modulating thrombotic processes involving monocyte activation.
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