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- W1997974343 abstract "In order to detect and characterise Na+-H+ countertransport in the fetal lung epithelium we have studied under a variety of conditions the effect of an outward facing H+ gradient on Na+ uptake into purified apical membrane vesicles prepared from alveolar type II cells. Kinetic analysis of the data reveals both a diffusional and a saturable component of total Na+ uptake. Evidence for the presence of a Na+-H+ exchanger is demonstrated by (1) stimulation of Na+ uptake by proton loading of vesicles both in the presence and absence of chemical voltage clamping; (2) saturation kinetics with respect to external Na+ with a Km of 16 mM and a Vmax of 2.1 nmol/mg protein per min; (3) amiloride inhibition of Na+ uptake driven by pH gradient. We conclude that although diffusion may be the major component of total Na+ uptake at physiological external Na+ concentration, Na+-H+ countertransport provides a possible mechanism for the acidification of fetal lung liquid in-vivo in addition to its established role in intracellular pH and volume regulation." @default.
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- W1997974343 date "1990-09-01" @default.
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- W1997974343 title "Sodium-proton exchange across the apical membrane of the alveolar type II cell of the fetal sheep" @default.
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- W1997974343 doi "https://doi.org/10.1016/0005-2736(90)90258-p" @default.
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