PMID: 10381790Jun 25, 1999Paper

Tetraethylammonium and amantadine identify distinct organic cation transporters in rat renal cortical proximal and distal tubules

The Journal of Pharmacology and Experimental Therapeutics
K B Goralski, Daniel S Sitar

Abstract

Tetraethylammonium (TEA) and amantadine are two organic cations that are secreted by the kidney. It appears that each cation may characterize distinct renal tubule organic cation transport pathways. To test this hypothesis, we investigated the renal proximal and distal tubule energy-dependent transport properties of TEA and amantadine. Isolated tubules were incubated at 25 degrees C in bicarbonate buffer (Krebs-Henseleit solution) and nonbicarbonate buffer (Cross-Taggart) with varying concentrations of [14C]TEA or [3H]amantadine to determine initial rates of energy-dependent uptake of TEA and amantadine, respectively. The uptake of TEA could best be described by two transport sites, a high-affinity site and a lower affinity site. TEA uptake was not influenced by the presence of bicarbonate. Consistent with our previously reported data, amantadine uptake could also be described by two transport sites, a high-affinity-capacity site that is bicarbonate-dependent and a lower-affinity-capacity transport site that is bicarbonate-independent. The renal tubule uptake of amantadine into proximal and distal tubules, in Krebs-Henseleit solution or Cross-Taggart buffers, was not inhibited by 10 to 1000 microM of TEA. However, tubule accumu...Continue Reading

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