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      Effect of Probenecid on Urate Excretion in the Cat Kidney

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      https://www.riss.kr/link?id=A100663852

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      The characteristics of probenecid effect on renal urate excretion in the cat were studied by clearance method and compared with those in the rabbit. In the cat GFR was $3.03{\pm}0.09\;ml/min{\cdot}kg$, and endogenous plasma urate concentration was $1.12{\pm}0.57\;{\mu}g/ml$, which is less than that in the rabbit $(3.33{\pm}0.46\;{\mu}g/ml)$. In the rabbit, $FE_{ur}$ was $1.76{\pm}0.08$ and net urate secretion was observed, while, in the cat $FE_{ur}$ was $0.70{\pm}0.02$ and net reabsorption was observed. In the cat $FE_{ur}$ was dependent on urine flow and independent of plasma urate concentration. In the rabbit $FE_{ur}$ was suppressed by infusion of probenecid $(30\;mg/kg\;-0.6\;mg/kg{\cdot}min)$ into femoral vein. In the cat the same dose of probenecid increased $FE_{ur}$ and concomitantly increased urine flow. Thus, an increase in $FE_{ur}$ by probenecid could be considered to be resulted from a change in urine flow. In the cat infusion of probenecid $(2.5\;mg/kg{\cdot}min)$ into renal artery markedly suppressed $FE_{P\;A\;H}$, but the effects on $FE_{ur}$ and urine flow were similar to those when probenecid was infused into femoral vein. These results indicate that in the cat kidney urate filtered through glomerulus is reabsorbed by a probenecid-insensitive mechanism with no evidence for net secretion.
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      The characteristics of probenecid effect on renal urate excretion in the cat were studied by clearance method and compared with those in the rabbit. In the cat GFR was $3.03{\pm}0.09\;ml/min{\cdot}kg$, and endogenous plasma urate concentration was $1....

      The characteristics of probenecid effect on renal urate excretion in the cat were studied by clearance method and compared with those in the rabbit. In the cat GFR was $3.03{\pm}0.09\;ml/min{\cdot}kg$, and endogenous plasma urate concentration was $1.12{\pm}0.57\;{\mu}g/ml$, which is less than that in the rabbit $(3.33{\pm}0.46\;{\mu}g/ml)$. In the rabbit, $FE_{ur}$ was $1.76{\pm}0.08$ and net urate secretion was observed, while, in the cat $FE_{ur}$ was $0.70{\pm}0.02$ and net reabsorption was observed. In the cat $FE_{ur}$ was dependent on urine flow and independent of plasma urate concentration. In the rabbit $FE_{ur}$ was suppressed by infusion of probenecid $(30\;mg/kg\;-0.6\;mg/kg{\cdot}min)$ into femoral vein. In the cat the same dose of probenecid increased $FE_{ur}$ and concomitantly increased urine flow. Thus, an increase in $FE_{ur}$ by probenecid could be considered to be resulted from a change in urine flow. In the cat infusion of probenecid $(2.5\;mg/kg{\cdot}min)$ into renal artery markedly suppressed $FE_{P\;A\;H}$, but the effects on $FE_{ur}$ and urine flow were similar to those when probenecid was infused into femoral vein. These results indicate that in the cat kidney urate filtered through glomerulus is reabsorbed by a probenecid-insensitive mechanism with no evidence for net secretion.

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