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Abstract

Influence of renal failure in rats on the disposition of salicyl acyl glucuronide and covalent binding of salicylate to plasma proteins.

J H Liu, R S Malone, H Stallings and P C Smith
Journal of Pharmacology and Experimental Therapeutics July 1996, 278 (1) 277-283;
J H Liu
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R S Malone
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H Stallings
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P C Smith
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Abstract

Many acyl glucuronides are labile, reactive and form covalent adducts with proteins. In the present experiment, the stability of salicyl acyl glucuronide (SAG), its reactivity with serum albumin in vitro and the influence of renal failure in rats on the disposition of SAG and covalent binding of salicylate (SA) to rat plasma proteins were investigated. In vitro studies showed that SAG was hydrolyzed to SA or undergoes isomerization to positional isomers. The half-life of SAG was 1.3 hr in 0.15 M phosphate buffer at pH 7.4 and 37 degrees C, but the stability of its isomers was much greater with an apparent half-life of 19 hr. Incubation of SAG in solutions of human serum albumin revealed the formation of covalent adducts with the protein, with maximal binding of 2.8% of total SA equivalents added to the solution. For in vivo studies, one group of rats was administered 5 mg/kg of uranyl nitrate i.p. to induce renal failure. After administration of 100 mg/kg of SA i.v., the AUC 0-26 hr of SAG in rats with renal failure was 9 times higher than that observed in control rats. The apparent clearance of SA decreased from 64 +/- 21 ml/hr in control rats 28 +/- 8.7 ml/hr in rats with renal failure. The level of SA covalent adducts with plasma proteins reached about 0.5 ng/mg of protein in control rats, whereas in rats with renal failure the binding was increased significantly and achieved an average peak concentration of 18 ng/mg of protein when measured 26 hr after dosing. The data indicate that reactive SAG can accumulate in renal failure which then increases covalent addition of SA to proteins. Such binding may have a role in enhancing the potential for toxicity of acidic drugs such as SA in renal disease.

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Journal of Pharmacology and Experimental Therapeutics
Vol. 278, Issue 1
1 Jul 1996
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Abstract

Influence of renal failure in rats on the disposition of salicyl acyl glucuronide and covalent binding of salicylate to plasma proteins.

J H Liu, R S Malone, H Stallings and P C Smith
Journal of Pharmacology and Experimental Therapeutics July 1, 1996, 278 (1) 277-283;

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Abstract

Influence of renal failure in rats on the disposition of salicyl acyl glucuronide and covalent binding of salicylate to plasma proteins.

J H Liu, R S Malone, H Stallings and P C Smith
Journal of Pharmacology and Experimental Therapeutics July 1, 1996, 278 (1) 277-283;
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