Abstract
Background and Objective
Imatinib is primarily transported into the liver by organic cation transporter 1 (OCT1), organic anion transporting polypeptide 1B3 (OATP1B3), and novel organic cation transporter 2 (OCTN2), which is the first step in the metabolic and elimination of imatinib. Patients taking imatinib may concurrently take metformin, a substrate for OCT1. Drug-drug interactions (DDI) may occur between imatinib and metformin, affecting the clinical efficacy of imatinib. This experiment aimed to investigate the pharmacokinetic effects of metformin on imatinib and its active metabolism of N-desmethyl imatinib in rats.
Methods
Twenty healthy Sprague-Dawley rats were selected and randomly divided into control and experimental groups (10 rats per group). The control group was orally administered imatinib (30 mg/kg) for 14 days, and the experimental group was orally co-administered imatinib (30 mg/kg) and metformin (200 mg/kg) for 14 days. The plasma concentrations of imatinib and N-desmethyl imatinib in rats were determined by ultra-performance liquid chromatography-mass spectrometry. Pharmacokinetic parameters were calculated by DAS2.0 software.
Results
After single-dose co-administration of imatinib and metformin on day 1, the AUC0−24 (area under the plasma concentration-time curve) and Cmax (maximum concentration) of imatinib and the MRT (mean residence time) and Cmax of N-desmethyl imatinib in the experimental group were significantly decreased compared with the control group (P < 0.05). After multiple-dose co-administration of imatinib and metformin for 14 days, the AUC0−24 and Cmax of both imatinib and N-desmethyl imatinib were significantly decreased in the experimental group (P < 0.05).
Conclusion
With both single and multiple co-administration doses, metformin significantly changed the pharmacokinetic parameters of imatinib and N-desmethyl imatinib. The results suggest that care should be taken when metformin and imatinib are co-administered.
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Code Availability
Not applicable.
Data Availability
The datasets generated and analyzed during the current study are not publicly available but are available from the corresponding author.
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Acknowledgments
The authors acknowledge the support from the Fourth Hospital of Hebei Medical University (Shijiazhuang, China). The authors also acknowledge the support from People's Livelihood Science and Technology special projects of Key Research and Development Plan of the Science and Technology Department of Hebei Province (program number: 20377757D). The fund sponsor did not participate in the design and research of the article.
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Conceptualization: XC, LD, ML. Data curation: XC, NF, TG. Funding acquisition: XC. Investigation: XC, NF, TG. Writing–original draft: NF. Writing–review and editing: XC, NF.
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The study was approved by the Animal Ethics Committee of the Fourth Hospital of Hebei Medical University (grant no. 2023206). The study entitled was “Monitoring of imatinib plasma concentration for individualized treatment of gastrointestinal stromal tumors.”
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Fan, N., Du, L., Guo, T. et al. Pharmacokinetic Interaction Between Imatinib and Metformin in Rats. Eur J Drug Metab Pharmacokinet 49, 171–179 (2024). https://doi.org/10.1007/s13318-023-00869-x
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DOI: https://doi.org/10.1007/s13318-023-00869-x