Roles of UGT, P450, and Gut Microbiota in the Metabolism of Epacadostat in Humans
| Autor: | Jason Boer, William Frietze, Andrew P. Combs, Jack G. Shi, Frank M Nedza, Ruth Young-Sciame, Swamy Yeleswaram, Sharon Diamond, Fiona Lee, Kevin Bowman, Laurine G. Galya, Xiaoqing Yang |
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| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Spectrometry Mass Electrospray Ionization Glucuronosyltransferase Metabolite Proton Magnetic Resonance Spectroscopy Glucuronidation Pharmaceutical Science Gut flora Secondary metabolite digestive system 030226 pharmacology & pharmacy 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Cytochrome P-450 Enzyme System Oximes medicine Humans Pharmacology Sulfonamides biology Microbiota CYP1A2 Primary metabolite biology.organism_classification Intestines Metabolic pathway 030104 developmental biology Biochemistry chemistry UDP-Glucuronosyltransferase 1A9 biology.protein lipids (amino acids peptides and proteins) medicine.drug |
| Zdroj: | Drug metabolism and disposition: the biological fate of chemicals. 44(10) |
| ISSN: | 1521-009X |
| Popis: | Epacadostat (EPA, INCB024360) is a first-in-class, orally active, investigational drug targeting the enzyme indoleamine 2,3-dioxygenase 1 (IDO1). In Phase I studies, EPA has demonstrated promising clinical activity when used in combination with checkpoint modulators. When the metabolism of EPA was investigated in humans, three major, IDO1-inactive, circulating plasma metabolites were detected and characterized: M9, a direct O-glucuronide of EPA; M11, an amidine; and M12, N-dealkylated M11. Glucuronidation of EPA to form M9 is the dominant metabolic pathway, and in vitro, this metabolite is formed by UGT1A9. However, negligible quantities of M11 and M12 were detected when EPA was incubated with a panel of human microsomes from multiple tissues, hepatocytes, recombinant human cytochrome P450s (P450s), and non-P450 enzymatic systems. Given the reductive nature of M11 formation and the inability to define its source, the role of gut microbiota was investigated. Analysis of plasma from mice dosed with EPA following pretreatment with either antibiotic (ciprofloxacin) to inhibit gut bacteria or 1-aminobenzotriazole (ABT) to systemically inhibit P450s demonstrated that gut microbiota is responsible for the formation of M11. Incubations of EPA in human feces confirmed the role of gut bacteria in the formation of M11. Further, incubations of M11 with recombinant P450s showed that M12 is formed via N-dealkylation of M11 by CYP3A4, CYP2C19, and CYP1A2. Thus, in humans three major plasma metabolites of EPA were characterized: two primary metabolites, M9 and M11, formed directly from EPA via UGT1A9 and gut microbiota, respectively, and M12 formed as a secondary metabolite via P450s from M11. |
| Databáze: | OpenAIRE |
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