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The kinetic deuterium isotope effect as applied to metabolic deactivation of imatinib to the des-methyl metabolite, CGP74588

Manley, Paul W. and Blasco, Francesca and Mestan, Juergen and Aichholz, Reiner (2013) The kinetic deuterium isotope effect as applied to metabolic deactivation of imatinib to the des-methyl metabolite, CGP74588. Bioorganic Medicinal Chemistry, 21 (11). pp. 3233-3239. ISSN 0968-0896

Abstract

There has recently been a burgeoning interest in impeding drug metabolism by replacing hydrogen atoms with deuterium to invoke a kinetic isotope effect. Imatinib, a front-line therapy for both chronic myeloid leukemia and of gastrointestinal stromal tumours, is often substantially metabolised via N-demethylation to the less active CGP74588. Since deuterium-carbon bonds are stronger than hydrogen-carbon bonds, we hypothesised that the N-trideuteromethyl analogue of imatinib might be subject to a reduced metabolic turnover as compared to imatinib and lead to different pharmacokinetic properties, and hence improved efficacy, in vivo. Consequently, we investigated whether the N-trideuteromethyl analogue would maintain target inhibition and show a reduced propensity for N-demethylation in both in vitro assays with liver microsomes and following oral administration to rats. The N-trideuteromethyl compound exhibited similar activity as a tyrosine kinase inhibitor as imatinib and similar efficacy as an antiproliferative in cellular assays. In comparison to imatinib, the trideuterated analogue also showed reduced N-demethylation upon incubation with both rat and human liver microsomes, consistent with a deuterium isotope effect. However, the reduced in vitro metabolism did not translate into increased exposure of the N-trideuteromethyl analogue following intravenous administration of the compound to rats and no significant difference was observed for the formation of the N-desmethyl metabolite from either parent drug.

Item Type: Article
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Keywords: Glivec Imatinib
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Date Deposited: 13 Oct 2015 13:14
Last Modified: 13 Oct 2015 13:14
URI: https://oak.novartis.com/id/eprint/7664

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