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Metabolism of cabozantinib by enzymes of first phase of biotransformation
 Jurečka, Tomáš ; Indra, Radek (advisor) ; Kubíčková, Božena (referee)
Cabozantinib is an anticancer drug that inhibit tyrosine kinases which allow signal pathways important for growth and development of tumors. It is used for treatment of medullary thyroid cancer, hepatocellular carcinoma and kidney cancer. The major enzymes of the first phase of biotransformation that metabolize cabozantinib are cytochromes P450. In this thesis it was studied metabolism of cabozantinib and cytochromes P450 that participated on this metabolism. Hepatic microsomes of rat, mouse and rabbit were used for studying metabolism of cabozantinib in this thesis. It was also focused on the impact of particular isoforms of cytochromes P450 on metabolism of cabozantinib in rat microsomes. Time dependence of cabozantinib conversion in hepatic rat microsomes was also studied. Enzyme kinetics of metabolism of cabozantinib in hepatic rat microsomes, as well as impact of cytochromes P450 inhibitors on the metabolism were included. Metabolites were analyzed by high performance liquid chromatography (HPLC) and mass spectrometry. Formation of metabolites of cabozantinib increased over time to 30 minutes of incubation and with some others to 40 minutes of incubation. Up to five different metabolites were detected in experiments (M1, desmethyl cabozantinib, M3, monohydroxy cabozantinib and cabozantinib...
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