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Induction of Cytochrome P450 2B6 and 3A4 Expression by Phenobarbital and Cyclophosphamide in Cultured Human Liver Slices

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Abstract

Purpose. To examine the potential of cultured human liver slices to predict cytochrome P450 (CYP) inducibility, regarding global and zonal CYP expression, together with drug-induced histologic changes.

Methods. We first assessed whether CYP2B6, 3A4, and 2C9 expression was maintained in cultured liver slices. Cultured hepatocytes were used as the reference culture system. Then we tested the effects of phenobarbital and cyclophosphamide on CYP expression in both models.

Results. Morphologic features are preserved in slices. Basal CYP expression declines with time in culture in both models. Slices display the same region specificity of CYP2B6, 2C9, and 3A4 expression as intact liver. CYP2B6 and 3A4 mRNA, apoprotein, and enzyme-related activities were induced by phenobarbital and cyclophosphamide, whereas CYP2C9 apoprotein was not. Their immunoreactivities were also increased, while their zonal distribution was preserved on slice tissue sections. Microsomal enzyme induction was confirmed by histology.

Conclusions. Cultured human liver slices are an attractive alternative to hepatocyte culture for the prediction of human CYP isoenzyme induction by xenobiotics.

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Authors and Affiliations

  1. Drug Safety Evaluation, Aventis Pharma SA, Vitry-sur-Seine, France

    Hélène Martin, Jean-Pierre Sarsat, Véronique Albaladejo & Carole Lerche-Langrand

  2. INSERM U490, Centre Universitaire des Saints-Pères, Paris, France

    Isabelle de Waziers & Philippe Beaune

  3. Faculté de Médecine Saint-Antoine, INSERM U402 and Centre de Recherches Chirurgicales, Paris, France

    Chantal Housset & Pierre Balladur

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  1. Hélène Martin
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  2. Jean-Pierre Sarsat
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  3. Isabelle de Waziers
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  4. Chantal Housset
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Correspondence to Hélène Martin.

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Martin, H., Sarsat, JP., de Waziers, I. et al. Induction of Cytochrome P450 2B6 and 3A4 Expression by Phenobarbital and Cyclophosphamide in Cultured Human Liver Slices. Pharm Res 20, 557–568 (2003). https://doi.org/10.1023/A:1023234429596

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