Inhibition of Cytochrome P450 by Nomilin and Obacunone and Potential Mechanism in Human Liver Microsomes
| Autor: | Ya-zhuo Li, Gregory Ondieki, Xin He, Yun-long Chen, Junxiu Chen, Fang-Liang Zhang, Yaowen Fan |
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| Rok vydání: | 2017 |
| Předmět: |
Pharmacology
Human liver CYP3A4 biology Chemistry Cytochrome P450 030226 pharmacology & pharmacy 01 natural sciences 0104 chemical sciences 010404 medicinal & biomolecular chemistry 03 medical and health sciences 0302 clinical medicine Complementary and alternative medicine Biochemistry Ic50 values Microsome biology.protein Pharmacology (medical) Inhibitory effect Potential mechanism Incubation |
| Zdroj: | Chinese Herbal Medicines. 9:295-298 |
| ISSN: | 1674-6384 |
| Popis: | Objective Nomilin and obacunone are two important limonoids that are well known for their anticancer effect. Previous studies showed that limonoids had inhibitory effect on cytochrome P450 3A4 (CYP3A4). However these effects are inconclusive with regards to prediction of potential drug interactions. Methods Nomilin or obacunone was pre-incubated with HLMs for 30 min. Following 10-fold dilution from the pre-incubation concentration, a second incubation was performed in the presence of NADPH and cytochrome P450 substrates for 15 min. The reaction was quenched and the supernatants were analyzed by chromatography/mass spectrometry. Results In this study, nomilin and obacunone showed potent inhibitory effect on CYP3A4 with the IC50 values of 3.50 and 6.08 µmol/L, respectively. The inhibition of CYP3A4 was in a time-, concentration- and NADPH-dependent manner with Ki values of 2.92 and 1.25 µmol/L and Kinact values of 0.033 and 0.078 min−1 for nomilin and obacunone respectively. These results elucidated that they were time-dependent inhibitors for CYP3A4. Conclusion Concomitant use of limonoids and other drugs may call for extra caution for purposes of clinical safety. |
| Databáze: | OpenAIRE |
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