{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nThe P2X7 receptor is an ATP‐gated ion channel that, upon activation, not only opens a cation‐selective channel but also triggers formation of a large membrane pore. This pore permits the rapid uptake of dyes and facilitates the release of pro‐inflammatory mediators such as interleukin‑1β via mechanisms that involve associated proteins like pannexin‑1. In immune cells—including macrophages, neutrophils, and astrocytes—the receptor also initiates inflammasome activation and caspase‑1 processing, leading to pyroptosis and other downstream responses (see, for example, the studies reporting pore formation, dye uptake, and IL‑1β release:."}, {"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": "\nBeyond its role in acute inflammatory signalling, P2X7 activation also contributes to cell proliferation, survival and pain signalling. In tumor models, P2X7 activity has been linked to enhanced cancer cell growth through increased NFAT activation, promotion of angiogenic factors such as VEGF, and metabolic reprogramming—all of which foster tumor expansion and neoangiogenesis. Moreover, in neuronal and non‐neuronal tissues the receptor modulates pathways underlying neuropathic and inflammatory pain, and in mast cells it regulates secretion of cytokines and chemokines that exacerbate local inflammation. These growth‐promoting and pro‐nociceptive effects have been documented in studies spanning neuroblastoma, other cancers, and inflammatory pain models."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "13", "end_ref": "24"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to these functional roles, considerable attention has been focused on the regulation of P2X7 receptor function through genetic variability, alternative splicing, and interactions with intracellular signaling proteins. Multiple single‐nucleotide polymorphisms and splice variants have been identified that modulate pore formation, ion channel activity, and downstream signalling, thereby influencing susceptibility to infectious diseases, chronic pain, mood disorders, and even cancer. Moreover, studies in T cells and microglial cells have demonstrated that P2X7-mediated Ca²⁺ influx is critical for autocrine activation, modulation of metabolic fitness, and even processing of amyloid precursor protein in neurodegenerative disorders. These aspects underscore the therapeutic potential of targeting P2X7 in a variety of clinical settings."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "25", "end_ref": "49"}, {"type": "fg_f", "ref": "40"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Philip A Verhoef, Mark Estacion, William Schilling, et al. 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