{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRecent studies have revealed that the P2X5 receptor plays multifaceted roles in tissue regeneration and neuronal signaling. In regenerating skeletal muscle, its sequential expression on activated satellite cells and subsequent myotube formation points to a critical function in myoblast proliferation and differentiation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " In the retina, the receptor is localized to the soma of cholinergic amacrine cells, implying a role in modulating retinal neurotransmission."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": " Moreover, extensive distribution of P2X5 across various regions of the central nervous system—including the olfactory bulb, cerebral cortex, and cerebellum—supports its involvement in ATP-mediated fast neurotransmission"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": ", while its presence on luteinizing hormone-releasing hormone neurons in the hypothalamus suggests a contribution to neuroendocrine regulation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nThe receptor is also expressed early in embryogenesis, appearing as early as embryonic day 8 in the neural tube and later segregating to nascent neuronal and sensory populations, which indicates an important role in neurogenesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": " In contrast, within the leukemic microenvironment, P2X5 expression is notably absent in bone marrow and spleen macrophages—as other P2X receptor subtypes dominate—underscoring its tissue-specific expression and function."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its roles in neural and developmental contexts, P2X5 serves as a distinctive cell surface marker in adipose tissues, selectively identifying brown and beige adipocytes from their white counterparts, a property that holds promise for targeted metabolic therapies."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": " In bone, the receptor is critically involved in osteoclast maturation and inflammatory bone loss by mediating ATP-induced inflammasome activation and IL-1β production, thereby contributing to pathological bone resorption."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": " Finally, its role as a protective immune regulator is highlighted during bacterial infections, where P2X5-dependent inflammasome activation facilitates effective microbial clearance independently of the conventional ATP-P2X7 pathway."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Mina Ryten, Shi Yu Yang, Philip M Dunn, et al. 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