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Updated: Jul 10, 2026
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Published on: June 10, 2025
Role of P2Y receptor subtypes in platelet-derived microparticle generation
Bryan N Kahner1, Robert T Dorsam, Satya P Kunapuli
1Department of Physiology, Temple University School of Medicine, Philadelphia, Pennsylvania 19140, USA
Abstract:
Microparticles are shed from the platelet membrane upon platelet activation by strong agonists, and they aid in clot formation. As the P2Y1 and the P2Y12 receptors differentially contribute to different platelet functions, we studied the relative contribution of the P2Y1 and P2Y12 receptors to microparticle formation from platelets. The P2Y12 receptor antagonist AR-C 69931MX, but not the P2Y1 receptor antagonist MRS2179, caused a significant decrease in the number microparticles formed by convulxin and thrombin. In addition, there was no significant decrease in microparticle formation in P2Y1 knockout mouse blood when compared to the wild type mice. These results illustrate that the P2Y12 receptor contributes to microparticle formation from activated platelets by a strong agonist, without any significant involvement of the P2Y1 receptor. We also conclude that there is no correlation in the number of microparticles circulating in vivo between the P2Y1 receptor null mice and the wild type mice under unstimulated conditions. Finally, we conclude that the increased bleeding time in the P2Y1 null mice is due to overall platelet dysfunction and not due to the decrease of circulating microparticles.
Insights
The P2Y12 receptor, not the P2Y1 receptor, significantly reduces microparticle formation from activated platelets. This suggests P2Y12
Area of Science:
- Hematology
- Platelet Biology
- Thrombosis
Background:
- Platelet activation leads to microparticle shedding, contributing to clot formation.
- P2Y1 and P2Y12 receptors play distinct roles in platelet function.
Purpose of the Study:
- To investigate the specific roles of P2Y1 and P2Y12 receptors in platelet microparticle formation.
- To determine the contribution of each receptor to platelet activation and microparticle release.
Main Methods:
- Utilized P2Y1 and P2Y12 receptor antagonists (MRS2179 and AR-C 69931MX, respectively) in platelet activation assays.
- Compared microparticle formation in P2Y1 knockout mice versus wild-type mice.
- Administered strong agonists like convulxin and thrombin to induce platelet activation.
Main Results:
- P2Y12 receptor antagonist AR-C 69931MX significantly decreased microparticle formation.
- P2Y1 receptor antagonist MRS2179 did not significantly affect microparticle formation.
- P2Y1 knockout mice showed no significant difference in microparticle formation compared to wild-type mice.
Conclusions:
- P2Y12 receptor is crucial for microparticle formation from platelets activated by strong agonists.
- P2Y1 receptor plays a minimal role in agonist-induced microparticle formation.
- Increased bleeding time in P2Y1 null mice is linked to general platelet dysfunction, not reduced microparticles.
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