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Kidney international v.49 no.3, 1996년, pp.634 - 638  

Plasma clearance in the rat of a furan dicarboxylic acid which accumulates in uremia.

Costigan, M G Lindup, W E
  • 초록  

    The furan dicarboxylic acid 3-carboxy-4-methyl-5-propyl-2-furanpropanoic acid (5-propyl FPA) accumulates in the plasma of patients with chronic renal failure and has been implicated in several aspects of the uremic syndrome: the defective binding of organic acids in uremic plasma, inhibition of active tubular secretion, anemia and the severity of neurological symptoms. Evidence from experiments with rat kidney slices suggests that 5-propyl FPA undergoes active tubular secretion, and so its clearance after an intravenous bolus dose (5 mg/kg; 21 mumol/kg) was investigated in anaesthetized female Wistar albino rats in vivo. The effects of intravenous bolus doses of p-aminohippuric acid (PAH) and probenecid on the clearance of this dose of 5-propyl FPA were also studied. The mean values (N = 16) for plasma half-life, plasma clearance and apparent volume of distribution of 5-propyl FPA were 3.6 hours, 2.4 ml . min(-1) . kg(-1) and 0.69 liter . kg(-1), respectively. An equimolar dose of PAH did not affect the clearance of 5-propyl FPA, but a tenfold higher molar dose of PAH (40.4 mg/kg) increased the area under the plasma-concentration time curve of 5-propyl FPA, and there was a trend towards a decrease in the clearance and a prolongation of the half-life. Probenecid at a fivefold higher dose than 5-propyl FPA had a similar effect to PAH and increased the AUC of 5-propyl FPA. PAH and probenecid decreased the plasma clearance of 5-propyl FPA, which is evidence that this uremic metabolite undergoes active tubular secretion. It follows that 5-propyl FPA could therefore inhibit the secretion of other organic acids.


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