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• W1956649709 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 accumulation of TEA could be inhibited (>90%) by amantadine in proximal and distal tubules in Krebs-Henseleit solution and Cross-Taggart buffers. In proximal tubules, N1-methylnicotinamide was not able to inhibit amantadine uptake but it reduced TEA uptake by 60 to 70% at similar concentrations. These data support the existence of multiple renal tubule organic cation transporters that have different substrate affinity and controlling mechanisms. It is also apparent that amantadine characterizes organic cation transporters that are distinct from those characterized by TEA." @default.
• W1956649709 created "2016-06-24" @default.
• W1956649709 creator A5008617842 @default.
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• W1956649709 date "1999-07-01" @default.
• W1956649709 modified "2023-09-23" @default.
• W1956649709 title "Tetraethylammonium and amantadine identify distinct organic cation transporters in rat renal cortical proximal and distal tubules." @default.
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• W1956649709 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10381790" @default.
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