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Drug Metab Dispos. 2018 Dec;46(12):1879-1885. doi: 10.1124/dmd.118.083428. Epub 2018 Oct 1.

Regional Differences in Human Intestinal Drug Metabolism.

Author information

1
Division of Pharmaceutical Technology and Biopharmacy (R.I., M.I.I., D.O., H.A.M.M., P.O.) and Division of Pharmacokinetics, Toxicology and Targeting (M.T.M., M.H.d.J.), Department of Pharmacy, University of Groningen, Groningen, The Netherlands; Faculty of Pharmacy, Universitas Indonesia, Depok, Indonesia (R.I.); Department of Surgery, University Medical Center Groningen, Groningen, The Netherlands (H.S.H.); and Department of Clinical Medicine, Aarhus University, Aarhus, Denmark (H.A.M.M.).
2
Division of Pharmaceutical Technology and Biopharmacy (R.I., M.I.I., D.O., H.A.M.M., P.O.) and Division of Pharmacokinetics, Toxicology and Targeting (M.T.M., M.H.d.J.), Department of Pharmacy, University of Groningen, Groningen, The Netherlands; Faculty of Pharmacy, Universitas Indonesia, Depok, Indonesia (R.I.); Department of Surgery, University Medical Center Groningen, Groningen, The Netherlands (H.S.H.); and Department of Clinical Medicine, Aarhus University, Aarhus, Denmark (H.A.M.M.) p.olinga@rug.nl.

Abstract

The intestines are key for the absorption of nutrients and water as well as drug metabolism, and it is well known that there are clear differences in the expression profile of drug metabolism enzymes along the intestinal tract. Yet only a few studies have thoroughly investigated regional differences in human intestinal drug metabolism. In this study, we evaluated phase I and phase II metabolism in matched human ileum and colon precision-cut intestinal slices (PCIS). To this end, human PCIS were incubated for 3 hours with testosterone and 7-hydroxycoumarin (7-HC) to examine phase I and phase II metabolism, respectively. Metabolite formation was assessed by high-performance liquid chromatography analysis. Our results demonstrated that androstenedione, 6β-hydroxytestosterone, 2β-hydroxytestosterone, and 7-HC sulfate were predominantly formed in the ileum, while 15α-hydroxytestosterone and 7-HC glucuronide were mainly produced in the colon. Moreover, we also observed sex differences in phase II metabolite formation, which appeared to be higher in men compared with women. Taken together, we demonstrated that phase I metabolism predominantly occurs in ileum PCIS, while phase II metabolism mostly takes place in colon PCIS. Moreover, we revealed that human PCIS can be used to study both regional and sex differences in intestinal metabolism.

PMID:
30275119
DOI:
10.1124/dmd.118.083428

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