Journal of Society of Preventive Korean Medicine (대한예방한의학회지)

Society of Preventive Korean Medicine (대한예방한의학회)
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Inhibitory Effect of Licorice Ethanol Extracts and Glycyrrhizin on Cytochrome P450 Drug-Metabolizing Enzymes in Human Liver Microsomes

감초 물 추출물 및 Glycyrrhizin이 인체 간 Microsome에서 Cytochrome P450 약물대사효소에 미치는 영향

  • Park Jong-Hoon (Dept. of Herbology, College of Oriental Medicine, Woosuk University) ;
  • Park Ji-Young (Dept. of Pharmacology, Gachon Medical School) ;
  • Ju Young-Sung (Dept. of Herbology, College of Oriental Medicine, Woosuk University)
  • 박종훈 (우석대학교 한의과대학 본초학교실) ;
  • 박지영 (가천의과대학교 약리학과) ;
  • 주영승 (우석대학교 한의과대학 본초학교실)
  • Published : 2003.12.29
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Abstract

Objective : The aim of present study is to evaluate the inhibitory potential of licorice extract and glycyrrhizin on cytochrome P450(CYP) in human liver microsomes. Methods : Using human liver microsomes, water extract of licorice and glycyrrhizin as an inhibitor were co-incubated with each probe drug representing selective CYP isoform activity. We measured relative metabolic activity in incubation condition compared to that with no extract of licorice using HPLC system. Results : Both water extracts of licorice and glycyrrhizin showed inhibitory effect on CYP-catalyzed reactions. CYP2C19 $(IC_{50}=126.7{\mu}g/ml)$ is most potently inhibited by water extract than other tested CYP isoforms$(IC_{50}>450{\mu}g/ml)$, but glycyrrhizin exhibited potent inhibition on CYP1A2$(IC_{50}=106.9{\mu}g/ml)$ followed by CYP2C9 and CYP2D6. Conclusion: These results indicate that water extract of licorice and glycyrrhizin have inhibitory potential on CYP-catalyzed reaction in human liver microsomes. But the mechanism of inhibition was slightly different between them Water extract of licorice mainly inhibited CYP2C19, and glycyrrhizin primarily inhibited CYP1A2. The inhibition by water extract of licorice and glycyrrhizin on CYP isoforms may cause drug interaction with co-administered drug leading to toxicity or treatment failure.

Keywords

References

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