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Na+/Ca2+ Exchangers

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Synonyms

Na+/Ca2+ antiporter; Na+/Ca2+ exchanger; NCX; NCX1; NCX2; NCX3; Sodium calcium exchanger

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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Correspondence to Lucio Annunziato .

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Glossary

CBD1 and CBD2

Calcium binding domain 1 and 2 of the f loop

f loop

Intracellular domain between transmembrane segments 5 and 6 of the sodium calcium exchanger

Forward or Ca2+ efflux mode

Mode of operation of NCX extruding calcium and intruding sodium ions

Na+-dependent Ca2+ uptake

Calcium uptake elicited by reduced concentrations of extracellular sodium

PIP2

Phosphatidylinositol 4,5 bisphosphate

Reverse or Ca2+ influx mode

Mode of operation of NCX extruding sodium and intruding calcium ions

XIP

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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  • Print ISBN: 978-3-030-21573-6

  • Online ISBN: 978-3-030-21573-6

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