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Research ArticleArticle

Refinement of an in Vitro Cell Model for Cytochrome P450 Induction

José M. Silva, Pierre E. Morin, Stephen H. Day, Brian P. Kennedy, Paul Payette, Thomas Rushmore, James A. Yergey and Deborah A. Nicoll-Griffith
Drug Metabolism and Disposition May 1998, 26 (5) 490-496;
José M. Silva
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Pierre E. Morin
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Stephen H. Day
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Brian P. Kennedy
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Paul Payette
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Thomas Rushmore
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James A. Yergey
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Deborah A. Nicoll-Griffith
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Abstract

Induction of cytochromes P450 (P450s) by drugs can lead to drug-drug interactions. Primary hepatocytes have been reported to retain inducible P450s. To optimize the use of primary hepatocytes for predicting induction of P450 (CYP 3A and 2B) expression in vivo, both culture conditions and expression of induction potentials were investigated. In rat hepatocytes, basal CYP 3A1/2 expression was better maintained in cells cultured on Matrigel compared with collagen when low concentrations of dexamethasone were used. However, CYP 3A1/2 induction was not affected by either matrix. In contrast, induction of CYP 2B1/2 by phenobarbital was markedly stronger in hepatocytes cultured on Matrigel. To further validate the in vitro model, Sprague-Dawley rats and isolated hepatocytes cultured on Matrigel were exposed to a series of compounds. In an attempt to minimize large variability between experiments, a novel approach for calculating induction potential was applied. In vitro results for CYP 3A1/2 and 2B1/2 induction correlated well with those observed in vivo. In contrast with rat hepatocytes, basal CYP 3A4 expression in human hepatocytes decreased rapidly in cells cultured on either Matrigel or collagen. However, CYP 3A4 inducibility was retained in cells cultured on either matrix. Interestingly, induction of CYP 3A4 in human hepatocytes by several model compounds did not correlate with the induction of CYP 3A1/2 in rat hepatocytes. This in vitro assay should facilitate the demand for a fast and reproducible method for addressing P450 induction by numerous compounds at the drug discovery stage.

Footnotes

  • Send reprint requests to: José M. Silva, Ph.D., Merck Frosst Centre for Therapeutic Research, P.O. Box 1005, Pointe-Claire-Dorval, Quebec H9R 4P8, Canada.

  • ↵1 Current address: Astra Research Centre Montreal, 7171 Frederick-Banting, Saint-Laurent, Quebec, Canada.

  • Abbreviations used are::
    P450
    cytochrome P450
    G3PDH
    glyceraldehyde-3-phosphate dehydrogenase
    • Received June 26, 1997.
    • Accepted January 23, 1998.
  • The American Society for Pharmacology and Experimental Therapeutics
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Drug Metabolism and Disposition
Vol. 26, Issue 5
1 May 1998
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Research ArticleArticle

Refinement of an in Vitro Cell Model for Cytochrome P450 Induction

José M. Silva, Pierre E. Morin, Stephen H. Day, Brian P. Kennedy, Paul Payette, Thomas Rushmore, James A. Yergey and Deborah A. Nicoll-Griffith
Drug Metabolism and Disposition May 1, 1998, 26 (5) 490-496;

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Research ArticleArticle

Refinement of an in Vitro Cell Model for Cytochrome P450 Induction

José M. Silva, Pierre E. Morin, Stephen H. Day, Brian P. Kennedy, Paul Payette, Thomas Rushmore, James A. Yergey and Deborah A. Nicoll-Griffith
Drug Metabolism and Disposition May 1, 1998, 26 (5) 490-496;
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