In Vitro Regio- and Stereoselective Oxidation of β-Ionone by Human Liver Microsomes

Shinsuke Marumoto; Ryoyu Shimizu; Genzoh Tanabe; Yoshiharu Okuno; Mitsuo Miyazawa

doi:10.1055/s-0042-112128

Planta Medica, Table of Contents

Planta Med 2017; 83(03/04): 292-299
DOI: 10.1055/s-0042-112128

Pharmacokinetic Investigations

Original Papers

Georg Thieme Verlag KG Stuttgart · New York

In Vitro Regio- and Stereoselective Oxidation of β-Ionone by Human Liver Microsomes

Authors

Shinsuke Marumoto

¹Joint Research Center, Kinki (Kindai) University, Kowakae, Higashiosaka-shi, Osaka, Japan
Ryoyu Shimizu

²Department of Applied Chemistry, Faculty of Science and Engineering, Kinki (Kindai) University, Kowakae, Higashiosaka-shi, Osaka, Japan
Genzoh Tanabe

³Pharmaceutical Research and Technology Institute, Kinki (Kindai) University, Higashi-osaka, Osaka, Japan
Yoshiharu Okuno

⁴Department of Materials Science, Wakayama National College of Technology, Gobo, Wakayama Japan
Mitsuo Miyazawa

²Department of Applied Chemistry, Faculty of Science and Engineering, Kinki (Kindai) University, Kowakae, Higashiosaka-shi, Osaka, Japan

⁵Graduate School of Materials Science Nara Institute of Science and Technology, Ikoma, Nara, Japan

Abstract

The metabolism of the norisoprenoid β-ionone was investigated in vitro using human liver microsomes and 11 different recombinant cytochrome P450 enzymes expressed in Trichoplusia ni cells. β-Ionone was found to be oxidized via 4S-hydroxylation by CYP2B6 in human liver microsomes. CYP1A2 also regioselectively catalyzed the hydroxylation of β-ionone to yield 4-hydroxylation; this conversion was not stereoselective. Further kinetic analysis revealed that CYP2B6 exhibited the highest activity for β-ionone 4-hydroxylation. Kinetic analysis showed that K _m and V _max for oxidation of β-ionone by CYP1A2 and CYP2B6 was 107.9 ± 36.0 µM and 3200.3 ± 323.0 nmol/min/nmol P450 and 5.6 ± 1.2 µM and 572.8 ± 29.8 nmol/min/nmol P450, respectively. The reaction rates observed using human liver microsomes and recombinant CYP2B6 were very high compared with those of other CYP2B6 substrates reported thus far. These results suggest that β-ionone, a norisoprenoid present in nature, is one of the effective substrates for CYP2B enzymes in human liver microsomes. To the best of our knowledge, this is the first time that 4-hydroxy β-ionone has been described as a human metabolite of β-ionone.

Key words

β-ionone - human liver microsome - cytochrome P450 - regio- and stereoselective oxidation - 4-hydroxy-β-ionone

Full Text

References

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