Metabolic pathways and pharmacokinetics of BOF-4272, a sulfoxide-containing drug, in the dog: in vivo and in vitro studies.

Abstract

BOF-4272, (+/-)-8-(3-methoxy-4- phenylsulfinylphenyl)pyrazolo[1,5-a]-1,3,5-triazine-4(1H)-one, is a new drug intended for the treatment of hyperuricemia. This report describes the detailed metabolic pathways of BOF-4272 in the dog. The metabolic pathways were investigated using the metabolites found in plasma, urine, and feces after intravenous or oral administration of BOF-4272, as well as the metabolites found in the liver S9 incubation mixture after the addition of BOF-4272 or BOF-4269. BOF-4269 (the sulfide metabolite of BOF-4272) was the only metabolite detected in plasma and feces after the intravenous or oral administration of BOF-4272. BOF-4269 was detected in dog plasma after a lag time following the oral administration of BOF-4272, and the Cmax and AUC0-t of BOF-4269 were higher in fed dogs than in fasted dogs after the oral administration of BOF-4272. A small amount of BOF-4269 was detected in dog plasma immediately after the intravenous administration of BOF-4272. Only BOF-4276 (the sulfone metabolite of BOF-4272) was detected in the S9 incubation mixture after the addition of BOF-4272. Mainly BOF-4272 was detected and small amounts of BOF-4276 and M-1 (the hydroxy metabolite of BOF-4269) were detected in the S9 incubation mixture after the addition of BOF-4269. These findings suggest that BOF-4272 is mainly metabolized to BOF-4269 by the intestinal flora in dogs, whereas little of this drug is metabolized to BOF-4269 in the dog liver. In conclusion, this work has allowed us to formulate the proposed metabolic pathways of BOF-4272 in the dog.

• Authors: S Naito, M Nishimura, H Yoshitsugu, H Nogawa
• Journal: Biological & pharmaceutical bulletin (Biol Pharm Bull) Vol. 22 Issue 12 Pg. 1391-5 (Dec 1999) ISSN: 0918-6158 [Print] Japan
• PMID: 10746178 (Publication Type: Journal Article)

Chemical References

• Enzyme Inhibitors
• Sulfoxides
• Triazines
• BOF 4272

Topics

• Animals
• Biotransformation
• Dogs
• Enzyme Inhibitors (blood, metabolism, pharmacokinetics, urine)
• Feces (chemistry)
• Liver (metabolism)
• Male
• Sulfoxides (chemistry, pharmacology)
• Triazines (blood, metabolism, pharmacokinetics, urine)