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Functional and Structural Properties of the NCKX2 Na+-Ca2+/K+ Exchanger: A Comparison with the NCX1 Na+/Ca2+ Exchanger

  • Haider F. Altimimi
  • Robert T. Szerencsei
  • Paul P. M. SchnetkampEmail author
Chapter
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 961)

Abstract

Na+/Ca2+-K+ exchangers (NCKX), alongside the more widely known Na+/Ca2+ exchangers (NCX), are important players in the cellular Ca2+ toolkit. But, unlike NCX, much less is known about the physiological roles of NCKX, while emergent evidence indicates that NCKX has highly specialized functions in cells and tissues where it is expressed. As their name implies, there are functional similarities in the properties of the two Ca2+ exchanger families, but there are specific differences as well. Here, we compare and contrast their key functional properties of ionic dependence and affinities, as well as report on the effects of KB-R7943 – a compound that is widely used to differentiate the two exchangers. We also review structural similarities and differences between the two exchangers. The aim is to draw attention to key differences that will aid in differentiating the two exchangers in physiological contexts where both exist but perhaps play distinct roles.

Keywords

Na+/Ca2+ exchanger Na+/Ca2+-K+ exchanger NCX NCKX KB-R7943 SLC24 

Notes

Acknowledgements

The work presented here was supported by an operating grant (MOP 81327) from the Canadian Institutes for Health Research (to PPMS).

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Haider F. Altimimi
    • 1
  • Robert T. Szerencsei
    • 1
  • Paul P. M. Schnetkamp
    • 1
    Email author
  1. 1.Department of Physiology and Pharmacology, Hotchkiss Brain InstituteUniversity of CalgaryAlbertaCanada

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