{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSLC8A1, which encodes the Na⁺/Ca²⁺ exchanger NCX1, is a multifunctional membrane protein fundamental to the regulation of intracellular calcium homeostasis. By catalyzing the bidirectional exchange of three sodium ions for one calcium ion, NCX1 not only maintains resting calcium levels but also modulates rapid Ca²⁺ transients in response to diverse physiological stimuli. For example, detailed biophysical studies have established its transport stoichiometry and its role in mediating both Ca²⁺ efflux under resting conditions and Ca²⁺ influx (reverse mode) when electrochemical gradients are altered, thereby impacting processes such as apoptosis and arrhythmogenesis in cardiac and non‐cardiac cells."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "10"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nNCX1’s activity is tightly integrated with cell‐specific signaling networks in diverse tissues. In cardiomyocytes, for instance, NCX1 plays a key role in coupling with anchoring proteins (e.g. ankyrin‐B) to regulate Ca²⁺ dynamics that affect both contractility and electrical automaticity. In vascular smooth muscle, endothelial cells, neurons, platelets, and even the nuclear envelope, NCX1 modulates Ca²⁺ transients that influence vasomotor tone, angiogenesis, neurotransmission, and cell survival. Additionally, the exchanger can operate in reverse mode to trigger signaling cascades downstream of receptors (e.g. via TRPC3 and VEGF pathways), while its expression and function can be modulated by inflammatory cytokines, hormonal signals, and even by genetic variation that affects cardiac conduction and blood pressure regulation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "11", "end_ref": "30"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMoreover, emerging evidence indicates that NCX1 is involved in adaptive and maladaptive responses to pathophysiological stress. In ischemic and hypoxic conditions, modulation of NCX1 expression or activity (often via interactions with modulatory proteins such as calmodulin or calretinin) can influence cell survival, calcium overload, and downstream pro‐survival signaling pathways. Its regulated activity has been implicated in preconditioning phenomena in brain and heart, endocrine secretion (e.g. in pancreatic β‐cells) and even in the regulation of bone mineralization. Notably, recent studies have highlighted the impact of alternative splicing and non‐coding RNAs (such as circSLC8A1) on NCX1 function, thereby affecting cardiac conduction, automaticity, and tumor cell proliferation. These diverse functions underscore SLC8A1’s importance as a key player in Ca²⁺‐mediated signaling across systems, and they point to its potential as a therapeutic target in cardiovascular, neurological, and oncological disorders."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "31", "end_ref": "39"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Hui Dong, Jeremy Dunn, Jonathan Lytton "}, {"type": "b", "children": [{"type": "t", "text": "Stoichiometry of the Cardiac Na+/Ca2+ exchanger NCX1.1 measured in transfected HEK cells."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Biophys J (2002)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/S0006-3495(02)75543-4"}], "href": "https://doi.org/10.1016/S0006-3495(02"}, {"type": "t", "text": "75543-4) PMID: "}, {"type": "a", "children": [{"type": "t", "text": "11916852"}], "href": "https://pubmed.ncbi.nlm.nih.gov/11916852"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Oscar Diaz-Horta, Adama Kamagate, André Herchuelz, et al. 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