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Coupled Na+/H+ exchange in rat parotid basolateral membrane vesicles

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Summary

pH gradient-dependent sodium transport in highly purified rat parotid basolateral membrane vesicles was studied under voltage-clamped conditions. In the presence of an outwardly directed H+ gradient (pHin=6.0, pHout=8.0)22Na uptake was approximately ten times greater than uptake measured at pH equilibrium (pHin=pHout=6.0). More than 90% of this sodium flux was inhibited by the potassium-sparing diuretic drug amiloride (K 1 =1.6 μm) while the transport inhibitors furosemide (1mm), bumetanide (1mm) SITS (0.5mm) and DIDS (0.1mm) were without effect. This transport activity copurified with the basolateral membrane marker K+-stimulatedp-nitrophenyl phosphatase. In addition22Na uptake into the vesicles could be driven against a concentration gradient by an outwardly directed H+ gradient. pH gradient-dependent sodium flux exhibited a simple Michaelis-Menten-type dependence on sodium concentration cosistent with the existence of a single transport system withK M =8.0mm at 23°C. A component of pH gradient-dependent, amiloride-sensitive sodium flux was also observed in rabbit parotid basolateral membrane vesicles. These results provide strong evidence for the existence of a Na+/H+ antiport in rat and rabbit parotid acinar basolateral membranes and extend earlier less direct studies which suggested that such a transporter was present in salivary acinar cells and might play a significant role in salivary fluid secretion.

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Authors and Affiliations

  1. Clinical Investigations and Patient Care Branch, National Institute of Dental Research, National Institutes of Health, 20892, Bethesda, Maryland

    Michel Manganel & R. James Turner

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  1. Michel Manganel
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  2. R. James Turner
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Manganel, M., Turner, R.J. Coupled Na+/H+ exchange in rat parotid basolateral membrane vesicles. J. Membrain Biol. 102, 247–254 (1988). https://doi.org/10.1007/BF01925718

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  • DOI: https://doi.org/10.1007/BF01925718

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