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In cardiac myocytes, Ca(2+) concentrations alternate between high levels during contraction and low levels during relaxation. The increase in Ca(2+) concentration during contraction is primarily due to release of Ca(2+) from intracellular stores. However, some Ca(2+) also enters the cell through the sarcolemma (plasma membrane). During relaxation, Ca(2+) is sequestered within the intracellular stores. To prevent overloading of intracellular stores, the Ca(2+) that entered across the sarcolemma must be extruded from the cell. The Na(+)-Ca(2+) exchanger is the primary mechanism by which the Ca(2+) is extruded from the cell during relaxation. In the heart, the exchanger may play a key role in digitalis action. The exchanger is the dominant mechanism in returning the cardiac myocyte to its resting state following excitation.
Gene Name: | solute carrier family 8 (sodium/calcium exchanger), member 1 |
Family/Subfamily: | Transporter , Calcium:cation antiporter |
Synonyms: | SLC8A1, CNC, NCX1, Sodium calcium exchanger 1, Sodium/calcium exchanger 1, Na+/Ca2+ exchanger, Na+/Ca++ exchanger |
Target Sequences: | NM_021097 NP_066920.1 P32418 |
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