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Physiologically Based Pharmacokinetic Modelling of Hyperforin to Predict Drug Interactions with St John’s Wort

  • Jeffry Adiwidjaja
  • Alan V. Boddy
  • Andrew J. McLachlanEmail author
Original Research article
  • 61 Downloads

Abstract

Background and Objectives

Herb–drug interactions with St John’s wort (SJW) have been widely studied in numerous clinical studies. The objective of this study was to develop and evaluate a physiologically based pharmacokinetic (PBPK) model for hyperforin (the constituent of SJW responsible for interactions), which has the potential to provide unique insights into SJW interactions and allow prediction of the likely extent of interactions with SJW compared to published interaction reports.

Methods

A PBPK model of hyperforin accounting for the induction of cytochrome P450 (CYP) 3A, CYP2C9 and CYP2C19 was developed in the Simcyp® Simulator (version 17) and verified using published, clinically observed pharmacokinetic data. The predictive performance of this model based on the prediction fold-difference (expressed as the ratio of predicted and clinically observed change in systemic exposure of drug) was evaluated across a range of CYP substrates.

Results

The verified PBPK model predicted the change in victim drug exposure due to the induction by SJW (expressed as area under the plasma concentration–time curve (AUC) ratio) within 1.25-fold (0.80–1.25) of that reported in clinical studies. The PBPK simulation indicated that the unbound concentration of hyperforin in the liver was far lower than in the gut (enterocytes). Simulations revealed that induction of intestinal CYP enzymes by hyperforin was found to be more pronounced than the corresponding increase in liver CYP activity (15.5- vs. 1.1-fold, respectively, at a hyperforin dose of 45 mg/day).

Conclusion

In the current study, a PBPK model for hyperforin was successfully developed, with a predictive capability for the interactions of SJW with different CYP3A, CYP2C9 and CYP2C19 substrates. This PBPK model is valuable to predict the extent of herb–drug interactions with SJW and help design the clinical interaction studies, particularly for new drugs and previously unstudied clinical scenarios.

Notes

Acknowledgements

JA is the recipient of a postgraduate scholarship from the Indonesia Endowment Fund for Education (LPDP), Ministry of Finance of the Republic of Indonesia. The authors are indebted to Simcyp Ltd (a Certara company) for providing the access to Simcyp® Simulator.

Author Contributions

JA, AVB and AJM wrote the manuscript, designed the research and contributed to the interpretation; JA performed the research and analysed the data.

Compliance with Ethical Standards

Conflict of interest

JA, AVB and AJM declare no competing interests for this work.

Funding

No funding was received for this work.

Supplementary material

40262_2019_736_MOESM1_ESM.docx (29 kb)
Supplementary material 1 (DOCX 29 kb)

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Jeffry Adiwidjaja
    • 1
  • Alan V. Boddy
    • 2
  • Andrew J. McLachlan
    • 1
    Email author
  1. 1.The University of Sydney, Sydney Pharmacy SchoolCamperdownAustralia
  2. 2.University of South Australia, School of Pharmacy and Medical SciencesAdelaideAustralia

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