Abstract
In order to study the characteristics of contraluminal phosphate transport the stopped flow microperfusion technique [13] has been applied. By measuring the time-dependent decrease of interstitial33Pi concentration at different starting concentrations a simple diffusion kinetics with a permeability coefficient of 7.5±1.0 · 10−8 cm2 s−1 was found. Such a kinetic was so far only observed with 2-deoxy-d-glucose. This substance, however, is transported in addition by facilitated diffusion as was seen by paraaminohippurate, methylsuccinate and sulfate. The contraluminal transport of phosphate was inhibited by H2-DIDS (5 mmol/l). It was, however, not influenced by omission of Na+ from the perfusates, by addition of sulfate (150 mmol/l), methylsuccinate (50 mmol/l), arsenate (50 mmol/l), the Hg-compound mersalyl (5 mmol/l), high and low phosphate diet and pH changes between 6.0 and 8.0. The data indicate that phosphate, which is reabsorbed from the lumen by a Na+-dependent transport system, leaves the cell by a rather unspecific contraluminal diffusion pathway.
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Ullrich, K.J., Papavassiliou, F., Rumrich, G. et al. Contraluminal phosphate transport in the proximal tubule of the rat kidney. Pflugers Arch. 405 (Suppl 1), S106–S109 (1985). https://doi.org/10.1007/BF00581789
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DOI: https://doi.org/10.1007/BF00581789