Metabolite identification and pharmacokinetic profiling of PP242, an ATPcompetitive inhibitor of mTOR using ultra high-performance liquidchromatography and mass spectrometry

Title
Metabolite identification and pharmacokinetic profiling of PP242, an ATPcompetitive inhibitor of mTOR using ultra high-performance liquidchromatography and mass spectrometry
Authors
정병화이현범라시드
Keywords
PP242; Pharmacokinetic profiling; mTOR inhibitor; LC?MS/MS; UHPLC-LTQ-Orbitrap-MS
Issue Date
2018-01
Publisher
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences
Citation
VOL 1072-251
Abstract
PP242 is a second generation novel selective ATP-competitive inhibitor of mTOR that displayed promising anticancer activity over several cancer types by inhibiting both the complexes of mTOR (mTORC1 and mTORC2). The purpose of this study is to identify the possible metabolites and to evaluate the pharmacokinetic profile of PP242 after a single oral administration to Sprague-Dawley (SD) rats. Two metabolites, including one phase I and one phase II, were identified by in vitro and in vivo studies using rat liver microsomes (RLMs) as well as rat plasma, urine and feces, respectively, through ultra high-performance liquid chromatography-linear ion trap quadrupole-orbitrap-mass spectrometry (UHPLC-LTQ-Orbitrap-MS). The major biotransformation pathways of PP242 were hydroxylation and glucuronide conjugation. Additionally, a simple and rapid quantification method was developed and validated. The method recovery was within 79.7– 84.6%, whereas the matrix effect was 78.1-96.0% in all three quality control (QC) concentrations (low, medium and high) including the LLOQ. Other parameters showed acceptable results according to the US food and drug administration (FDA) guidelines for bioanalytical method validation. Afterwards, pharmacokinetic parameters were evaluated in rat plasma by successfully applying the validated method using liquid chromatography-tandem mass spectrometry (LC– MS/MS). After a single oral administration at a dose of 5 mg/kg, the maximum plasma concentration (Cmax) of PP242 was 0.17 ± 0.08 μg/mL, while the elimination was moderately fast (T1/2: 172.18 ± 45.54 min). All of the obtained information on the metabolite identification and pharmacokinetic parameter elucidation could facilitate the further development of PP242.
URI
http://pubs.kist.re.kr/handle/201004/67109
ISSN
1570-0232
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KIST Publication > Article
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