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Drug Metab Lett. 2018;12(1):14-23. doi: 10.2174/1872312812666180119114013.

Cytochrome P450 1A2 Messenger RNA is a More Reliable Marker than Cytochrome P450 1A2 Activity, Phenacetin O-Deethylation, for Assessment of Induction Potential of Drug-Metabolizing Enzymes Using HepaRG Cells.

Author information

1
Department of Regeneration Medicine, Yokohama City University School of Medicine, Yokohama, Japan.
2
Research Unit/Innovative Medical Science, Sohyaku Innovative Research Division, Mitsubishi Tanabe Pharma Corporation, Toda, Japan.
3
Translational Research Department, Sohyaku Innovative Research Division, Mitsubishi Tanabe Pharma Corporation, Nihonbashi, Japan.
4
Discovery Technology Laboratories Sohyaku Innovative Research Division, Mitsubishi Tanabe Pharma Corporation, Toda, Japan.
5
Department of Clinical Pharmaceutics, Nihon Pharmaceutical University, Kitaadachi, Japan.

Abstract

BACKGROUND:

The HepaRG cells have key drug metabolism functionalities comparable to those of primary human hepatocytes. Many studies have reported that this cell line can be used as a reliable in vitro model for human drug metabolism studies, including the assessment of cytochrome P450 (CYP) induction.

OBJECTIVES:

The objective of this study is to determine whether CYP mRNA level measurement is superior to the CYP enzyme activity measurement as a convenient high-throughput method for evaluating CYP induction potential using HepaRG cells.

METHODS:

QuantiGene Plex 2.0 Assay and LC/MS/MS. mRNA expression levels and enzyme activities of CYP1A2, CYP2B6, and CYP3A in HepaRG cells treated with prototypical inducers of each CYP isoform [omeprazole (OME) for CYP1A2, phenobarbital (PB) for CYP2B6, and rifampicin (RIF) for CYP3A] were evaluated.

RESULTS:

Although the activities of CYP2B6 and CYP3A were induced by treatment with PB and RIF, we found that the activity of phenacetin O-deethylase (PHOD), which is known as a marker of the activity of CYP1A2, was also enhanced by treatment with these non-CYP1A2 inducers in HepaRG cells. Based on previously published reports, we hypothesized that the expression ratio of CYP3A to CYP1A2 is much higher in HepaRG cells than in human hepatocytes; this may result in a nonnegligible contribution of CYP3A to the PHOD reaction in HepaRG cells. Studies using CYP3A inhibitor and pregnane X receptor-knockout HepaRG cells supported this hypothesis.

CONCLUSION:

The measurement of mRNA serves as a higher reliable indicator for the evaluation of CYP induction potential when using HepaRG cells.

KEYWORDS:

CYP induction; HepaRG cells; PXR-knockout HepaRG cells; QuantiGene Plex 2.0 assay; drug–drug interaction; hepatocytes.

[Indexed for MEDLINE]

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