Reference

The metabolic disposition of aprepitant, a substance P receptor antagonist, in rats and dogs

The metabolic disposition of aprepitant, a substance P receptor antagonist, in rats and dogs. Huskey, Su-Er W.; Dean, Brian J.; Doss, George A.; Wang, Zhen; Hop, Cornelis E. C. A.; Anari, Reza; Finke, Paul E.; Robichaud, Albert J.; Zhang, Minghua; Wang, Bonnie; Strauss, John R.; Cunningham, Paul K.; Feeney, William P.; Franklin, Ronald B.; Baillie, Thomas A.; Chiu, Shuet-Hing L. (Merck Research Laboratories, Departments of Drug Metabolism, Rahway, NJ, USA). Drug Metabolism and Disposition, 32(2), 246-258 (English) 2004 American Society for Pharmacology and Experimental Therapeutics. CODEN: DMDSAI. ISSN: 0090-9556. DOCUMENT TYPE: Journal CA Section: 1 (Pharmacology) The absorption, metab., and excretion of [14C]aprepitant, a potent and selective human substance P receptor antagonist for the treatment of chemotherapy-induced nausea and vomiting, was evaluated in rats and dogs. Aprepitant was metabolized extensively and no parent drug was detected in the urine of either species. The elimination of drug-related radioactivity, after i.Several substances like 395-33-5 may be metioned in this study.v. or p.o. administration of [14C]aprepitant, was mainly via biliary excretion in rats and by way of both biliary and urinary excretion in dogs. Aprepitant was the major component in the plasma at the early time points (up to 8 h), and plasma metabolite profiles of aprepitant were qual. similar in rats and dogs. Several oxidative metabolites of aprepitant, derived from N-dealkylation, oxidn., and opening of the morpholine ring, were detected in the plasma. Glucuronidation represented an important pathway in the metab. and excretion of aprepitant in rats and dogs. 395-33-5 are also occured in this study. An acid-labile glucuronide of [14C]aprepitant accounted for ~18% of the oral dose in rat bile. The instability of this glucuronide, coupled with its presence in bile but absence in feces, suggested the potential for enterohepatic circulation of aprepitant via this conjugate. In dogs, the glucuronide of [14C]aprepitant, together with four glucuronides derived from phase I metabolites, were present as major metabolites in the bile, accounting collectively for ~14% of the radioactive dose over a 4- to 24-h period after i.v. dosing. Two very polar carboxylic acids, namely, 4-fluoro-a-hydroxybenzeneacetic acid and 4-fluoro-a-oxobenzeneacetic acid, were the predominant drug-related entities in rat and dog urine. ..

The metabolic disposition of aprepitant, a substance P receptor antagonist, in rats and dogs

The metabolic disposition of aprepitant, a substance P receptor antagonist, in rats and dogs. Huskey, Su-Er W.; Dean, Brian J.; Doss, George A.; Wang, Zhen; Hop, Cornelis E. C. A.; Anari, Reza; Finke, Paul E.; Robichaud, Albert J.; Zhang, Minghua; Wang, Bonnie; Strauss, John R.; Cunningham, Paul K.; Feeney, William P.; Franklin, Ronald B.; Baillie, Thomas A.; Chiu, Shuet-Hing L. (Merck Research Laboratories, Departments of Drug Metabolism, Rahway, NJ, USA). Drug Metabolism and Disposition, 32(2), 246-258 (English) 2004 American Society for Pharmacology and Experimental Therapeutics. CODEN: DMDSAI. ISSN: 0090-9556. DOCUMENT TYPE: Journal CA Section: 1 (Pharmacology) The absorption, metab., and excretion of [14C]aprepitant, a potent and selective human substance P receptor antagonist for the treatment of chemotherapy-induced nausea and vomiting, was evaluated in rats and dogs. Aprepitant was metabolized extensively and no parent drug was detected in the urine of either species. The elimination of drug-related radioactivity, after i.Several substances like 395-33-5 may be metioned in this study.v. or p.o. administration of [14C]aprepitant, was mainly via biliary excretion in rats and by way of both biliary and urinary excretion in dogs. Aprepitant was the major component in the plasma at the early time points (up to 8 h), and plasma metabolite profiles of aprepitant were qual. similar in rats and dogs. Several oxidative metabolites of aprepitant, derived from N-dealkylation, oxidn., and opening of the morpholine ring, were detected in the plasma. Glucuronidation represented an important pathway in the metab. and excretion of aprepitant in rats and dogs. 395-33-5 are also occured in this study. An acid-labile glucuronide of [14C]aprepitant accounted for ~18% of the oral dose in rat bile. The instability of this glucuronide, coupled with its presence in bile but absence in feces, suggested the potential for enterohepatic circulation of aprepitant via this conjugate. In dogs, the glucuronide of [14C]aprepitant, together with four glucuronides derived from phase I metabolites, were present as major metabolites in the bile, accounting collectively for ~14% of the radioactive dose over a 4- to 24-h period after i.v. dosing. Two very polar carboxylic acids, namely, 4-fluoro-a-hydroxybenzeneacetic acid and 4-fluoro-a-oxobenzeneacetic acid, were the predominant drug-related entities in rat and dog urine. ..