Synonyms
Definition
The plasma membrane Na+/Ca2+ exchanger is a high-capacity and low-affinity ionic transporter that exchanges three Na+ ions for one Ca2+ ion. When intracellular Ca2+ concentrations ([Ca2+]i) rise and the cells require the return to resting levels, this exchanger couples the uphill extrusion of Ca2+ ions to the influx of Na+ ions into the cells down their electrochemical gradient. This mode of operation, defined as forward mode, or Ca2+ efflux mechanism, keeps the 104-fold difference in [Ca2+]i across the cell membrane. Under other physiological or pathophysiological conditions when the intracellular Na+ concentrations ([Na+]i) rise, or membrane depolarization occurs and reduces the transmembrane Na+ electrochemical gradient, the Na+/Ca2+ exchanger mediates the extrusion of Na+ and the influx of Ca2+ ions. This last mode of operation is defined as reverse mode or Ca2+influx...
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References
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Glossary
- CBD1 and CBD2
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Calcium binding domain 1 and 2 of the f loop
- f loop
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Intracellular domain between transmembrane segments 5 and 6 of the sodium calcium exchanger
- Forward or Ca2+ efflux mode
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Mode of operation of NCX extruding calcium and intruding sodium ions
- Na+-dependent Ca2+ uptake
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Calcium uptake elicited by reduced concentrations of extracellular sodium
- PIP2
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Phosphatidylinositol 4,5 bisphosphate
- Reverse or Ca2+ influx mode
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Mode of operation of NCX extruding sodium and intruding calcium ions
- XIP
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20 amino acid region of the f loop of the sodium calcium exchanger
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Annunziato, L., Pignataro, G., Molinaro, P. (2020). Na+/Ca2+ Exchangers. In: Offermanns, S., Rosenthal, W. (eds) Encyclopedia of Molecular Pharmacology. Springer, Cham. https://doi.org/10.1007/978-3-030-21573-6_192-1
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DOI: https://doi.org/10.1007/978-3-030-21573-6_192-1
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