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DOI: 10.1055/s-0029-1240657
© Georg Thieme Verlag KG Stuttgart · New York
Inhibitory Effects of Deoxypodophyllotoxin from Anthriscus sylvestris on Human CYP2C9 and CYP3A4
Publication History
received September 9, 2009
revised October 25, 2009
accepted November 2, 2009
Publication Date:
03 December 2009 (online)
![](https://www.thieme-connect.de/media/plantamedica/201007/lookinside/thumbnails/10.1055-s-0029-1240657-1.jpg)
Abstract
Deoxypodophyllotoxin (DPT) is a bioactive compound of Anthriscus sylvestris (Apiaceae). In the present study, the inhibition of cytochrome P450 (CYP) by DPT was evaluated in human liver microsomes (HLM) and the baculovirus-insect cell-expressed human CYPs using a cocktail probe assay. When a mixture of specific CYP substrates was incubated with DPT in HLM, CYP2C9-catalyzed diclofenac 4-hydroxylation and CYP3A4-catalyzed midazolam 1-hydroxylation were strongly inhibited by DPT, with IC50 values of 6.3 and 9.2 µM, respectively. The Lineweaver-Burke plots for the inhibition of CYP2C9 and CYP3A4 in HLM and baculovirus-insect cell-expressed human CYPs were consistent with a competitive type of inhibition. From these results, DPT was characterized to be a competitive inhibitor of CYP2C9 and CYP3A4, with K i values of 3.5 and 10.8 µM in HLM and 24.9 and 3.5 µM in baculovirus-insect cell-expressed human CYPs, respectively.
Key words
deoxypodophyllotoxin - cytochrome P450 - competitive inhibition - cocktail probe assay - Anthriscus sylvestris - Apiaceae
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