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Fenofibrate is a prototypical agonist of peroxisome proliferator-activated receptor alpha (PPARalpha) which is well known to be associated with species related carcinogenesis. Important species differences have been reported in its metabolism and elimination pattern. Its new metabolites have been revealed in Cynomolgus monkeys and Sprague-Dawley rats. However in beagle dogs, several polar metabolites of fenofibrate have not been identified yet. In this study, beagle dogs were orally dosed with fenofibrate mixed with feeds. Urine and plasma samples were collected and subject to LC-MS/MS by comparison with authentic compounds and confirmed using an API 4000 Q-TRAP system. In vitro cultured primary hepatocytes were used to reveal metabolic pathways and confirm the data in vivo. Seven new metabolites of fenofibrate in dogs were identified, and their metabolic pathways were revealed. Fenofibrate in beagle dogs was found to be more prone to be metabolized into other secondary metabolites than fenofibric acid, compared with that in rats.


Julin Yang, Wenxia Luo, Li Chen, Renke Dai, Aiming Liu. Metabolism of fenofibrate in beagle dogs: new metabolites identified and metabolic pathways revealed. Die Pharmazie. 2013 Jun;68(6):414-20

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PMID: 23875247

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