PMID: 9193871Jun 1, 1997Paper

Disposition and metabolism of the sulfonylurea oncolytic agent LY295501 in mouse, rat, and monkey

Drug Metabolism and Disposition : the Biological Fate of Chemicals
William J EhlhardtD L Martin

Abstract

The disposition and metabolism of LY295501 was studied in mice, rats, and monkeys. This novel diaryl sulfonylurea oncolytic agent is structurally related to sulofenur and shows excellent activity in a broad range of mouse antitumor models. The compound is well absorbed, giving plasma concentrations greater than 200 micrograms/ml after oral doses of 30-100 mg/kg, where it appears to be completely bound (> 99.9%) to plasma proteins. The high degree of protein binding may be a factor in its relatively long half-life, which ranges from about 8 hr in rats and 15 hr in mice to 50 hr in monkeys. While more material was excreted in feces than in urine from mice and rats given single oral doses of [14C]LY295501, urine was the major route of elimination in monkeys. Three major metabolites-all formed via oxidation of the saturated part of the benzodihydrofuran moiety-were characterized in the urine of mice, rats, and monkeys. It is interesting that two of these metabolites are derived from opening of this saturated ring, an unusual metabolic process which represents a significant part of the metabolism of LY295501. As with sulofenur, metabolites of 3,4-dichloroaniline formed after metabolic cleavage of the sulfonylurea linkage were also f...Continue Reading

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