Biomolecules & Therapeutics

The Korean Society of Applied Pharmacology (한국응용약물학회)
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Characterization of Deoxypodophyllotoxin Metabolism in Rat Liver Microsomes

  • Published : 2008.09.30
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Abstract

Deoxypodophyllotoxin (DPT) is a medicinal herb product isolated from Anthriscus sylvestris. DPT possesses beneficial activities in regulating immediate-type allergic reaction and anti-inflammatory activity through the dual inhibition of cyclooxygenase-2 and 5-lipoxygenase. In the present study, the metabolism of DPT was further characterized in rat liver microsomes isolated from male Sprague Dawley rats. The metabolism of DPT was NADPH-dependent. In addition, when liver microsomes were incubated with SKF-525A, a well-known CYP inhibitor, in the presence of $\beta$-NADPH, the metabolism of DPT was significantly inhibited. Using enriched rat liver microsomes, the anticipated isoforms of cytochrome P450s (CYPs) in the metabolism of DPT were partially characterized. Phenobarbital-induced microsomes increased in the formation of metabolite M1. The metabolite M3 was only produced in the enriched microsomes isolated from dexamethasone-treated rats. The results indicated that the metabolism of DPT would be CYP-dependent and that CYP2B and CYP3A might be important in the metabolism of DPT in rats.

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References

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