Abstract
Purpose
In this study, the drug-drug interaction potential of vatiquinone with cytochrome P450 (CYP) substrates was investigated in both in vitro and clinical studies.
Methods
The inhibitory potential of vatiquinone on the activity of CYPs 1A2, 2B6, 2C8, 2C9, 2C19, 2D6, and 3A4/5 was assessed in vitro. In an open-label, drug-drug interaction study in 18 healthy human subjects, a single oral dose of 500 mg tolbutamide and 40 mg omeprazole was administered on day 1, followed by a washout of 7 days. Multiple oral doses of 400 mg vatiquinone (three times a day [TID]) were administered from day 8 to day 13 with coadministration of a single oral dose of 500 mg tolbutamide and 40 mg omeprazole on day 12.
Results
In vitro, vatiquinone inhibited CYP2C9 (IC50 = 3.7 µM) and CYP2C19 (IC50 = 5.4 µM). In the clinical study, coadministration of vatiquinone did not affect the pharmacokinetic (PK) profile of tolbutamide and omeprazole. The 90% confidence intervals (CIs) of geometric least-square mean ratios for maximum plasma concentration (Cmax), areas under the plasma concentration–time curve (AUC0-t), and AUC0-inf of tolbutamide and omeprazole were entirely contained within the 80 to 125% no effect limit, except a minor excursion observed for Cmax of omeprazole (geometric mean ratio [GMR], 94.09; 90% CI, 78.70–112.50). Vatiquinone was generally well tolerated, and no clinically significant findings were reported.
Conclusion
The in vitro and clinical studies demonstrated vatiquinone has a low potential to affect the pharmacokinetics of concomitantly administered medications that are metabolized by CYP enzymes.
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Data availability
The data that support the findings of this study are available from the corresponding author, MT, upon reasonable request.
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Funding
This work was funded by PTC Therapeutics, Inc.
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MT and KM conceptualized the study. KM, JM, and MT contributed to the in vitro DDI study design and data analysis. MT contributed to the clinical DDI study design and data analysis and managed the project. KM wrote the first draft of the paper. RB assisted with writing of the paper. KM, LL, JM, RB, and MT contributed to and approved the final version of the manuscript.
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The study was conducted at Bio-Kinetic Clinical Applications, LLC (BKCA, Springfield, MO). The study protocol was approved by the institute’s review board (BKCA). The study was performed in accordance with Good Clinical Practice and the Declaration of Helsinki.
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Informed consent was obtained from all individual participants included in the study.
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KM, LL, JM, RB, and MT are employed by PTC Therapeutics, Inc., and have received salary compensation for time and effort and hold financial interest in the company.
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Murase, K., Lee, L., Ma, J. et al. Evaluation of vatiquinone drug-drug interaction potential in vitro and in a phase 1 clinical study with tolbutamide, a CYP2C9 substrate, and omeprazole, a CYP2C19 substrate, in healthy subjects. Eur J Clin Pharmacol 78, 1823–1831 (2022). https://doi.org/10.1007/s00228-022-03393-0
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DOI: https://doi.org/10.1007/s00228-022-03393-0