Abstract
Objective
Macrolide antibiotics are mechanism-based inactivators of CYP3A enzymes that exhibit varying degrees of inhibitory potency. Our aim was to predict quantitatively the drug-drug interaction (DDI) potential of five macrolides from in vitro studies using testosterone as the CYP3A substrate, and to compare the predictions generated from human liver microsomal and recombinant CYP3A4 data.
Methods
The in vitro kinetic constants of CYP3A inactivation (K I and k inact) were estimated by varying the time of pre-incubation and the concentration of troleandomycin, erythromycin, clarithromycin, roxithromycin or azithromycin. CYP3A activity was determined from the measurement of testosterone 6β-hydroxylation with human liver microsomes (HLM) and recombinant CYP3A4 as the enzyme sources. The mechanism-based pharmacokinetic model was fitted with inactivation data to predict the increase in oral area under the plasma concentration-time curve (AUC) for midazolam.
Results
All five macrolides inactivated testosterone 6β-hydroxylation by HLM and recombinant CYP3A4 with k inact values in the range of 0.023 to 0.058 min−1. The potency of inactivation (K I) was higher using recombinant CYP3A4 as the enzyme source. The oral AUCs for midazolam were predicted from HLM data to increase 16.6, 5.3, 4.6, 1.6 and 1.2-fold due to the inhibition of metabolic clearance by troleandomycin, erythromycin, clarithromycin, roxithromycin and azithromycin, respectively. These results are within the range of the AUC ratios reported for clinical DDI studies. The predicted AUC increases generated using recombinant CYP3A4 overestimated the magnitude of the DDIs.
Conclusions
The DDI potential of five macrolide antibiotics was quantitatively predicted from in vitro studies using testosterone as the CYP3A substrate with HLM as the enzyme source.
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Acknowledgements
This work was supported by a grant from the National Health and Medical Research Council of Australia. Thomas M. Polasek is the recipient of an Australian post-graduate award. We thank Benjamin C. Lewis for the preparation of recombinant CYP3A4 and David J. Elliot for development of the testosterone 6β-hydroxylation assay. The authors declare that experiments with human liver tissue were approved by the Flinders Medical Centre Ethics Review Committee under current Australian law.
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Polasek, T.M., Miners, J.O. Quantitative prediction of macrolide drug-drug interaction potential from in vitro studies using testosterone as the human cytochrome P4503A substrate. Eur J Clin Pharmacol 62, 203–208 (2006). https://doi.org/10.1007/s00228-005-0091-x
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DOI: https://doi.org/10.1007/s00228-005-0091-x