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Expression of the human sodium/proton exchanger NHE-1 in Xenopus laevis oocytes enhances sodium/proton exchange activity and establishes sodium/lithium countertransport

  • Original Article
  • Transport Processes, Metabolism and Endocrinology; Kidney, Gastrointestinal Tract, and Exocrine Glands
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Abstract

We investigated whether the human sodium/proton (Na+/H+) exchanger isoform 1 (NHE-1) can mediate sodium/lithium (Na+/Li+) coutertransport. Using the Xenopus laevis oocyte expression system we determined amiloride-sensitive Li+ uptake, a measure of Na+/H+ exchange, in oocytes injected with water or NHE-1 cRNA. Amiloride-sensitive Li+ uptake was three-to tenfold enhanced over control in NHE-1 cRNA-injected cells and was selectively inhibited by 0.01 μM HOE 694 [i.e. (3-methylsulphonyl-4-piperidinobenzoyl) guanidine methanesulphonate]. The endogenously present Na+/H+ exchanger was insensitive to HOE 694. After acidification of oocytes from pH 7.7 to 6.8, amiloride-sensitive Li+ uptake was four-to tenfold higher in NHE-1 cRNA-injected cells than in controls. Li+ efflux from control oocytes was independent of extracellular Na+, indicating that these cells expressed no measurable Na+/Li+ countertransport activity. In NHE-1 cRNA-injected oocytes, Li+ efflux was distinctly enhanced by extracellular Na+ ions. This Na+-dependent Li+ efflux was inhibited by ethylisopropylamiloride, phloretin and by cytosolic acidification. The data show that expression of the NHE-1 in X. laevis oocytes induces the expression of Na+/Li+ countertransport. The data confirm that Na+/H+ exchange and Na+/Li+ countertransport are mediated by the same transport system.

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Authors and Affiliations

  1. Max-Planck-Institut für Biophysik, Kennedyallee 70, D-60596, Frankfurt, Germany

    Stefan Busch & Winfried Siffert

  2. Institut für Pharmakologie, Universitätsklinikum, Hufelandstrasse 55, D-45122, Essen, Germany

    Stefan Busch & Winfried Siffert

  3. Zentrum der Physiologie und Pathophysiologie, Humboldtallee 23, D-37073, Göttingen, Germany

    Birgitta -Christina Burckhardt

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  1. Stefan Busch
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  2. Birgitta -Christina Burckhardt
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Busch, S., Burckhardt, B.C. & Siffert, W. Expression of the human sodium/proton exchanger NHE-1 in Xenopus laevis oocytes enhances sodium/proton exchange activity and establishes sodium/lithium countertransport. Pflügers Arch. 429, 859–869 (1995). https://doi.org/10.1007/BF00374811

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  • DOI: https://doi.org/10.1007/BF00374811

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