{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nThe SLC8A3 gene encodes the Na⁺/Ca²⁺ exchanger type 3 (NCX3), a key protein in maintaining intracellular calcium homeostasis by mediating bidirectional Ca²⁺ fluxes. Transcriptional regulation of SLC8A3 is intricately controlled by second messengers: Ca²⁺ signals trigger CREB‐dependent activation via a CRE site in the promoter and are counterbalanced by DREAM-mediated repression through DRE sites located in exon 1. In addition, alternative splicing generates unique, N-terminally truncated isoforms—particularly expressed in fetal brain—that may tailor calcium handling to cell‑specific needs."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "3"}]}, {"type": "t", "text": "Disruptions and dynamic modulation of NCX3 function have profound physiological implications. For example, upregulation of NCX3 in developing oligodendrocytes is essential for myelin protein expression and proper cell maturation, while enhanced NCX3 activity in response to ischemic preconditioning and postconditioning contributes to neuroprotective mechanisms. Moreover, genetic studies have implicated SLC8A3 in central nervous system pain processing, with aberrant NCX3 activity being linked to abnormal temporal summation and increased susceptibility to persistent pain."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "4", "end_ref": "6"}]}, {"type": "t", "text": "Post-translational mechanisms further fine-tune NCX3 activity. Phosphorylation by protein kinases A and C modulates its Ca²⁺ uptake and extrusion rates, while cell cycle–dependent trafficking—regulated by N‑glycosylation—dictates its subcellular localization, enabling cells to adapt calcium signaling during proliferative and resting states. In pathological contexts, such as Alzheimer’s disease, calpain‐mediated cleavage of NCX3 disrupts its normal function, thereby impairing Ca²⁺ clearance and heightening neuronal vulnerability."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "9"}]}, {"type": "t", "text": ""}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Nadia Gabellini "}, {"type": "b", "children": [{"type": "t", "text": "Transcriptional regulation by cAMP and Ca2+ links the Na+/Ca2+ exchanger 3 to memory and sensory pathways."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Mol Neurobiol (2004)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1385/MN:30:1:091"}], "href": "https://doi.org/10.1385/MN:30:1:091"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15247490"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15247490"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Rose-Marie Lindgren, Jian Zhao, Susanne Heller, et al. 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