{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nP2X4 is an ATP‐gated cation channel that plays a pivotal role in the nervous and immune systems. In the central nervous system, injury‐induced de novo expression of P2X4 in microglia triggers BDNF release, leading to disinhibition of pain‐transmitting dorsal horn neurons and thus contributing to neuropathic pain. In immune cells, P2X4 localizes to the immune synapse upon T‐cell receptor stimulation and facilitates calcium influx that is required for downstream events such as NFAT activation and IL‑2 synthesis, while similar roles in γδ T lymphocytes underscore its importance in orchestrating cytokine responses. Moreover, in macrophages, P2X4 activation helps determine the duration of ATP‐evoked Ca²⁺ signals that direct chemokine secretion, and in neurons, abnormal accumulation and proteolytic‐processing of the receptor have been implicated in neurodegenerative processes."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "5"}]}, {"type": "t", "text": "\n\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its cell‐surface actions, P2X4 is expressed on intracellular membranes—most notably in lysosomes and endolysosomal compartments—where it forms functional, ATP‐gated cation channels whose activity is tightly regulated by lumenal pH. Channel gating and desensitization are governed by specific intracellular motifs and salt‐bridge interactions, with studies showing that mutations in key residues can drastically accelerate desensitization kinetics or alter the receptor’s sensitivity to allosteric modulators such as ivermectin. In addition, cholesterol-rich lipid raft environments modulate P2X4 channel function, and the receptor’s regulated trafficking between intracellular stores and the plasma membrane underlies its timely participation in processes such as endolysosomal membrane fusion mediated by calcium release and calmodulin recruitment."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "11"}]}, {"type": "t", "text": "\n\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn vascular, cardiac, and other peripheral tissues, P2X4 contributes to a range of pathophysiological processes. In endothelial cells, shear stress triggers ATP release that activates P2X4, thereby mediating Ca²⁺ influx to promote nitric oxide–dependent vasodilation, cell–cell adhesion remodeling, and migration. Genetic variation in P2RX4—such as the Tyr315>Cys variant—is linked to impaired phagocytosis in retinal microglia and altered arterial compliance with increased pulse pressure, while cytokine‐mediated upregulation further tunes its contribution during inflammation. In the kidney, P2X4 is implicated in high glucose–induced NLRP3 inflammasome activation relevant to diabetic nephropathy, and in airway epithelial cells, its expression in secretory cells helps amplify Ca²⁺ signals for mucin secretion. Finally, increased expression or modulation of P2X4 in cardiac muscle improves contractility in models of heart failure, and recent findings have even connected the receptor to tumor angiogenesis through a mechanism involving lysosomal trafficking and endothelial cell motility."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "12", "end_ref": "27"}]}, {"type": "t", "text": "\n\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "R Varma, Y Chai, J Troncoso, et al. 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