Na+/Ca2+ exchange and Na+/K+-ATPase in the heart.

The Journal of Physiology
Michael J ShattockZi-Jian Xie

Abstract

This paper is the third in a series of reviews published in this issue resulting from the University of California Davis Cardiovascular Symposium 2014: Systems approach to understanding cardiac excitation-contraction coupling and arrhythmias: Na(+) channel and Na(+) transport. The goal of the symposium was to bring together experts in the field to discuss points of consensus and controversy on the topic of sodium in the heart. The present review focuses on cardiac Na(+)/Ca(2+) exchange (NCX) and Na(+)/K(+)-ATPase (NKA). While the relevance of Ca(2+) homeostasis in cardiac function has been extensively investigated, the role of Na(+) regulation in shaping heart function is often overlooked. Small changes in the cytoplasmic Na(+) content have multiple effects on the heart by influencing intracellular Ca(2+) and pH levels thereby modulating heart contractility. Therefore it is essential for heart cells to maintain Na(+) homeostasis. Among the proteins that accomplish this task are the Na(+)/Ca(2+) exchanger (NCX) and the Na(+)/K(+) pump (NKA). By transporting three Na(+) ions into the cytoplasm in exchange for one Ca(2+) moved out, NCX is one of the main Na(+) influx mechanisms in cardiomyocytes. Acting in the opposite direction, ...Continue Reading

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Methods Mentioned

BETA
confocal microscopy
fluorescence studies
fluorescence resonance
co-immunoprecipitation
NMR
FRET

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