Key result
P2 receptors drive sequential platelet activation, serving as critical targets for antithrombotic therapy.
Why the study?
The distinct roles and signaling pathways of platelet P2 receptors in platelet function and hemostasis are important for understanding potential antithrombotic drug targets.
This review highlights the distinct roles of P2Y1, P2Y12, and P2X1 receptors in platelet activation and their potential as therapeutic targets for antithrombotic drugs.
Highlights nucleotide feedback via distinct P2 receptors in platelet activation; leaves open receptor-specific therapeutic targeting.
After vessel wall injury, platelets adhere to the exposed subendothelium, are activated, and release mediators such as thromboxane A (2) (TXA (2)) and nucleotides stored at very high concentration in the so-called dense granules. Among other soluble agents, released nucleotides act in a positive feedback mechanism to cause further platelet activation and amplify platelet responses induced by agents such as thrombin or collagen. Adenine nucleotides act on platelets through three distinct P2 receptors: two are G protein-coupled adenosine diphosphate (ADP) receptors, namely the P2Y (1) and P2Y (12) receptor subtypes; the P2X (1) receptor ligand-gated cation channel is activated by adenosine triphosphate (ATP). The P2Y (1) receptor initiates platelet aggregation but is not sufficient for a full platelet aggregation in response to ADP, whereas the P2Y (12) receptor is responsible for completion of the aggregation to ADP. This receptor, the molecular target of the antithrombotic drug clopidogrel, is responsible for most of the potentiating effects of ADP when platelets are stimulated by agents such as thrombin, collagen, or immune complexes. The P2X (1) receptor is involved in platelet shape change and in activation by collagen under shear conditions. Each of these receptors is coupled to specific signal transduction pathways in response to ADP or ATP and is differentially involved in all of the sequential events involved in platelet function and hemostasis. As such, they represent potential targets for antithrombotic drugs.
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Hechler et al. (2005) conducted a review in Platelet function and hemostasis. P2 receptors (P2Y1, P2Y12, P2X1) was evaluated. P2 receptors, including P2Y1, P2Y12, and P2X1, play distinct and sequential roles in platelet activation and aggregation, representing important targets for antithrombotic drugs like clopidogrel.
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