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Xenobiotica
the fate of foreign compounds in biological systems
Volume 53, 2023 - Issue 8-9
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General Xenobiochemistry

Empirical scaling factor for predicting human pharmacokinetic profiles of disproportionate metabolites using the Css–MRTpo method and chimeric mice with humanised livers

ORCID Icon, ORCID Icon, & ORCID Icon
Pages 523-535 | Received 15 Sep 2023, Accepted 04 Nov 2023, Published online: 20 Nov 2023
 

Abstract

Predicting plasma concentration–time profiles of disproportionate metabolites in humans is crucial for evaluating metabolites according to the Safety Testing guidelines. We evaluated Css–MRTpo, an empirical method, using chimeric mice with humanised livers capable of generating human-disproportionate metabolites. Azilsartan and AZ-M2 were administered to humanised chimeric mice, and pharmacokinetic parameters were obtained. Pharmacokinetic data for DS-1971a and DS-M1 in humanised chimeric mice were obtained from the literature. The human plasma concentration–time profiles of these compounds were simulated using the Css–MRTpo method. Azilsartan, DS-1971a, and PF-04937319 produced human disproportionate metabolites, AZ-M2, DS-M1, and PF-M1, respectively. The predicted human pharmacokinetic profiles of PF-04937319 and PF-M1 were obtained from a previous study, and their outcomes were re-evaluated. Our findings revealed that the plasma concentrations of the three metabolites were unexpectedly underpredicted, whereas the three unchanged drugs were reasonably predicted. Further, the introduction of the empirical scaling factor of 3, obtained from six model compounds, improved the predictability of metabolites, suggesting the potential usefulness of the Css–MRTpo method in combination with humanised chimeric mice for predicting the pharmacokinetic profiles of disproportionate metabolites at the early stage of new drug development.

Disclosure statement of interest

The authors report that there are no competing interests to declare.

Additional information

Funding

The author(s) reported there is no funding associated with the work featured in this article.

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