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Research ArticleArticle

Role of Furanocoumarin Derivatives on Grapefruit Juice-Mediated Inhibition of Human CYP3A Activity

Lian-Qing Guo, Katsuyuki Fukuda, Tomihisa Ohta and Yasushi Yamazoe
Drug Metabolism and Disposition July 2000, 28 (7) 766-771;
Lian-Qing Guo
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Katsuyuki Fukuda
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Tomihisa Ohta
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Yasushi Yamazoe
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Abstract

With juices of grapefruit and related fruits, possible relationships between contents of six different furanocoumarins and extents of inhibition of microsomal CYP3A activity have been studied in vitro. Microsomal CYP3A-mediated testosterone 6β-hydroxylation was inhibited by the addition of a fruit juice (2.5%, v/v) from eight different grapefruit sources, two sweeties, three pomelos, and one sour orange, whereas no clear inhibition was observed with two sweet orange juices. The inhibitory component in grapefruit juice resides mainly in the precipitate rather than in the supernatant after centrifugation. Higher amounts of (R)-6′,7′-dihydroxybergamottin (DHB) were distributed in the supernatant, whereas GF-I-1, GF-I-2, GF-I-4, and the newly isolated GF-I-5 and GF-I-6 were detected predominantly in the precipitate. Mixing of five representative furanocoumarins at their detectable levels in grapefruit juice reproduced roughly the inhibitory potencies of grapefruit juice, but omission of any of the components resulted in decreased potencies. These results suggested that all the major furanocoumarins contributed to the CYP3A inhibitory properties of grapefruit juice. Furthermore, all six furanocoumarins showed stronger CYP3A inhibitory potencies after preincubation in the presence of NADPH, suggesting that both competitive and mechanism-based inhibition occur in a grapefruit juices-drug interaction.

Footnotes

  • Send reprint requests to: Prof. Yasushi Yamazoe, Division of Drug Metabolism and Molecular Toxicology, Graduate School of Pharmaceutical Sciences, Tohoku University, Aramaki-Aoba, Aoba-ku, Sendai 980-8578, Japan. E-mail: yamazoe{at}mail.cc.tohoku.ac.jp

  • This study was supported in part by the Japan-China Sasagawa Medical Scholarship Foundation (L.-Q.G.) and Rotary Yoneyama Memorial Foundation (L.-Q.G.).

  • Abbreviations used are::
    GF-I-2
    bergamottin
    DHB
    (R)-6′,7′-dihydroxybergamottin
    GF-I-1
    4-[[6-hydroxy-7-[[1-[(1-hydroxy-1-methyl)ethyl]-4-methyl-6-(7-oxo-7H-furo[3,2-g][1]benzopyran-4-yl)-4-hexenyl]oxy]-3,7-dimethyl-2-octenyl]oxy]- 7H-furo[3,2-g][1]benzopyran-7-one
    GF-I-4
    4-[[6-hydroxy-7-[[4-methyl-1-(1-methylethenyl)-6-(7-oxo-7H-furo[3,2-g][1]benzopyran-4-yl)-4-hexenyl]oxy]-3,7-dimethyl-2-octenyl]oxy]-7H-furo[3,2-g][1]benzopyran-7-one
    GF-I-5
    (R)-bergamottin-6′,7′-epoxide
    GF-I-6
    4-(6R,7-dihydroxy-3,7-dimethyl-2E-octen-1-yloxy)-7H-furo[3,2-g]chromene-spiro-7R,2′-(4′,4′-dimethyl-5′R-(3-methyl-5-(7-oxo-furo[3,2-g]chromen-4-yloxy)-3E-penten-1-yl)-1′,3′-dioxolane)
    • Received December 13, 1999.
    • Accepted April 6, 2000.
  • The American Society for Pharmacology and Experimental Therapeutics
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Drug Metabolism and Disposition: 28 (7)
Drug Metabolism and Disposition
Vol. 28, Issue 7
1 Jul 2000
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Research ArticleArticle

Role of Furanocoumarin Derivatives on Grapefruit Juice-Mediated Inhibition of Human CYP3A Activity

Lian-Qing Guo, Katsuyuki Fukuda, Tomihisa Ohta and Yasushi Yamazoe
Drug Metabolism and Disposition July 1, 2000, 28 (7) 766-771;

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Research ArticleArticle

Role of Furanocoumarin Derivatives on Grapefruit Juice-Mediated Inhibition of Human CYP3A Activity

Lian-Qing Guo, Katsuyuki Fukuda, Tomihisa Ohta and Yasushi Yamazoe
Drug Metabolism and Disposition July 1, 2000, 28 (7) 766-771;
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