{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nThe platelet‐activating factor receptor (PAFR) is emerging as a highly pleiotropic mediator in human biology. In acutely stressed tissues—such as during anaphylaxis, after ultraviolet‐induced injury, or in conditions of aging and hypoxia—PAFR is upregulated on epithelial and endothelial cells. Its activation drives rapid mast cell degranulation and cytokine‐rich inflammatory cascades that, by promoting bacterial adherence and translocation, contribute to the susceptibility to infections (for example, pneumococcal adhesion in airway epithelium and intestinal translocation in hypoxic mucosa). Moreover, environmental pollutants like cigarette smoke and welding fumes have been shown to increase PAFR expression in respiratory epithelia, thereby facilitating pathogen entry and exacerbating airway inflammation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "8"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn many cancers, PAFR plays a central role in promoting tumor cell survival, proliferation, invasion, and metastasis. Tumor cells—including those from melanoma, ovarian, non‐small cell lung, and prostate carcinomas—express elevated levels of PAFR. Upon ligand binding, it triggers transactivation of growth factor receptors, stimulates downstream signaling cascades such as CREB, Src/STAT3, and ERK1/2, and upregulates matrix metalloproteinases that remodel extracellular matrix. These events not only confer resistance to chemotherapeutic agents (by activating anti‐apoptotic and autophagy‐suppressive mechanisms) but also facilitate epithelial–mesenchymal transition and metastatic dissemination."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "9", "end_ref": "18"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAt the molecular level, PAFR signals via a complex network of intracellular pathways. Activation of its coupled Gαq protein stimulates adenylate cyclase and MAPK cascades, and its compartmentalization in specialized membrane domains such as lipid rafts and caveolae is critical for proper signal propagation. High‐resolution structural studies have revealed unique conformational rearrangements upon ligand binding and the capacity for receptor dimerization and ubiquitin‐dependent internalization, which together regulate receptor desensitization and recycling. In addition, genetic polymorphisms and splice variations in the PAFR gene may modify signaling outcomes and disease susceptibility—including associations with multiple sclerosis and altered Th17 responses. PAFR also modulates cellular responses to oxidized lipids by affecting macrophage polarization and endothelial progenitor cell function, thereby influencing vascular disease progression."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "19", "end_ref": "40"}]}, {"type": "t", "text": ""}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Jeffrey B Travers, Howard J Edenberg, Qiwei Zhang, et al. 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