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Forefront of Na+/Ca2+ exchanger studies: physiology and molecular biology of monovalent cation sensitivities in Na+/Ca2+ exchangers.

Sensitivities of the reverse-mode Na+/Ca2+ exchange activity measured as the Na+i-dependent Ca2+ uptake to extracellular monovalent cations K+, Li+, and Na+ were compared between the K+ -dependent (NCKX2) and the K+ -independent Na+/Ca2+ exchanger (NCX1) overexpressed in a fibroblast cell. Interestingly, the exchange activity of NCKX2 was not influenced by Li+ while it was increased by K+. On the contrary, the activity of NCX1 was increased by Li+. Thus, the cation sensitivities to K+ and Li+ markedly differed between NCKX2 and NCX1. In addition, Na+ exerted a significantly smaller inhibitory effect on the activity in NCKX2 than in NCX1. The Na+/Ca2+ exchange activities of NCKX2 and NCX1 are considered to be regulated differentially via the respective binding site domains that have distinct sensitivities to the external monovalent cations.[1]

References

  1. Forefront of Na+/Ca2+ exchanger studies: physiology and molecular biology of monovalent cation sensitivities in Na+/Ca2+ exchangers. Uehara, A., Iwamoto, T., Nakamura, Y., Imanaga, I. J. Pharmacol. Sci. (2004) [Pubmed]
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