PMID: 4766Mar 30, 1976

Phosphate transport by isolated renal brush border vesicles

Pflügers Archiv : European journal of physiology
N HoffmannR Kinne

Abstract

A sodium dependent specific transport system for phosphate is present in the brush border microvilli but absent from the basal-lateral plasma membranes. The apparent affinity of this transport system for phosphate is 0.08 mM at 100 mM sodium and pH 7.4. It is inhibited competitively by arsenate with an apparent inhibitor constant of 1.1 mM (100 mM sodium, pH 7.4). Sodium dependent phosphate uptake is two times higher at pH 8 compared to the uptake observed at pH 6. The apparent affinity of the transport system for sodium is also pH-dependent, half-maximal stimulation of uptake is found at pH 6 with 129 mM sodium, at pH 7.4 with 60 mM sodium and at pH 8 with 50 mM sodium. Under all conditions a nonhyperbolic dependence of phosphate uptake on the sodium concentration is observed. The uptake of phosphate by brush border microvilli vesicles shows a typical overshoot phenomenon in the presence of sodium gradient across the membrane (CNao greater than CNai). The amount of pohsphate taken up after 2 min is about twice the equilibrium value reached after 2 h of incubation. At pH 7.4 the initial rate of uptake is increased only slighyly (12%) by inside negative membrane diffusion potentials and inhibited to the same extent by inside pos...Continue Reading

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Related Concepts

Metazoa
Arsenates
Plasma Membrane
Hydrogen-Ion Concentration
Kidney Tubules, Proximal
Orthophosphate
Sodium
Subcellular Fractions
Rats, Laboratory

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