{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nThe P2Y12 receptor is a G‑protein–coupled receptor that plays a central role in platelet activation, aggregation, and thrombus formation. Upon adenosine diphosphate (ADP) binding, it couples to Gi‐proteins to inhibit adenylyl cyclase and modulate intracellular Ca²⁺ flux, thereby strengthening platelet–platelet interactions. Detailed structural studies have revealed unique conformational changes and distinct ligand–binding pockets that explain both agonist recognition and the mechanisms by which antithrombotic drugs such as clopidogrel, prasugrel, ticagrelor, and novel inhibitors exert their effects. These findings underscore the receptor’s pivotal function in primary hemostasis and in the stabilization of platelet aggregates."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "12"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nGenetic polymorphisms in the P2Y12 receptor gene, as well as in genes governing clopidogrel metabolism, have been linked to interindividual variability in antiplatelet drug responsiveness. Specific haplotypes and sequence variants—including gain‐of‐function alleles and single-nucleotide polymorphisms such as T744C—can modulate ADP-induced platelet aggregation and influence clinical outcomes in patients treated with clopidogrel. Such genetic differences have important implications for personalized antithrombotic therapy, with studies showing associations between these variants and both enhanced platelet reactivity and differences in drug efficacy, thereby emphasizing the need for genotype-based treatment strategies."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "13", "end_ref": "22"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its pivotal role in platelets, P2Y12 is expressed in several other cell types—including microglia, vascular smooth muscle cells, and brain capillary endothelium—where it influences diverse biological processes. In the central nervous system, for example, shifts in P2Y12 expression are linked to microglial motility and phenotypic changes during neuroinflammation, and its presence helps distinguish homeostatic microglia from other macrophage populations. In the vasculature, P2Y12 signaling has been implicated in modulating autophagy in smooth muscle cells, thereby influencing lipid accumulation and foam cell formation in advanced atherosclerosis. Moreover, emerging evidence suggests that endogenous ligands, such as cysteinyl leukotrienes, can signal through P2Y12, contributing to inflammatory processes such as asthma, while alternate pathways mediated by the receptor affect neuronal Ca²⁺ channel regulation and the release of angiogenic factors from platelets."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "23", "end_ref": "33"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAdditional investigations have demonstrated that the modulation of P2Y12 signaling extends to pain pathways, platelet function in metabolic disorders, and prognostic assessments in cardiovascular interventions. For instance, innovative assays have compared platelet reactivity using point-of-care methodologies, while studies involving novel P2Y12 inhibitors have examined their roles in reducing inflammatory pain and in modulating proangiogenic factor release. Moreover, alterations in membrane microdomain composition (e.g., lipid rafts) have been shown to affect P2Y12 signaling efficiency, further linking receptor function to vascular and clinical outcomes in conditions such as diabetes and post-percutaneous coronary intervention thrombotic events."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "34", "end_ref": "39"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Tabassome Simon, Céline Verstuyft, Murielle Mary-Krause, et al. 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