QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) All Versions of this Article: dmd.104.001347v1 32/12/1402    most recent Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Katoh, M. Articles by Yokoi, T. Search for Related Content PubMed PubMed Citation Articles by Katoh, M. Articles by Yokoi, T.

EXPRESSION OF HUMAN CYTOCHROMES P450 IN CHIMERIC MICE WITH HUMANIZED LIVER

Division of Pharmaceutical Sciences, Graduate School of Medical Science, Kanazawa University, Kanazawa, Japan (M.Kato., T.M., M.N., T.Y.); Hiroshima Prefectural Institute of Industrial Science and Technology, Cooperative Link of Unique Science and Technology for Economy Revitalization, Hiroshima, Japan (C.T., M. Kata., K.Y.); PhenixBio Co., Ltd., Hiroshima, Japan (Y.S., T.H.); Pfizer Japan, Ltd., Aichi, Japan (K.I.); and Graduate School of Science, Hiroshima University, Hiroshima, Japan (K.Y.)

Recently, a chimeric mouse line in which the liver could be replaced by more than 80% with human hepatocytes was established in Japan. Because the chimeric mouse produces human albumin (hAlb), replacement by human hepatocytes could be estimated by the hAlb concentration in the blood of chimeric mice. In this study, we investigated human major cytochrome P450 (P450) in the livers of chimeric mice by mRNA, protein, and enzyme activity using real-time polymerase chain reaction, Western blot analysis, and high-performance liquid chromatography, respectively. Chimeric mice with humanized liver generated using hepatocytes from a Japanese and white donor were used. Human P450 mRNAs were expressed in the liver of chimeric mice, and major human P450 proteins such as CYP1A2, CYP2C9, and CYP3A4 were detected. The expression of P450 mRNA and protein was correlated with the hAlb concentration in the blood. The enzyme activities such as diclofenac 4'-hydroxylase activity, dexamethasone 6-hydroxylase activity, and coumarin 7-hydroxylase activity, activities that are specific to human P450 but not to murine P450, were increased in a hAlb concentration-dependent manner. The chimeric mice with nearly 90% replacement by human hepatocytes demonstrated almost the same protein contents of human P450s and drug-metabolizing enzyme activity as those of the donor. It was confirmed that genomic DNA from the livers of the chimeric mice and that from the liver of the donor exhibited the same genotype. In conclusion, the chimeric mice exhibited a similarly efficient capacity of drug metabolism as humans, suggesting that they could be a useful animal model for drug development.

This article has been cited by other articles:

				S. Kitamura, K. Nitta, Y. Tayama, C. Tanoue, K. Sugihara, T. Inoue, T. Horie, and S. Ohta Aldehyde Oxidase-Catalyzed Metabolism of N1-Methylnicotinamide in Vivo and in Vitro in Chimeric Mice with Humanized Liver Drug Metab. Dispos., July 1, 2008; 36(7): 1202 - 1205. [Abstract] [Full Text] [PDF]

				H. Okumura, M. Katoh, T. Sawada, M. Nakajima, Y. Soeno, H. Yabuuchi, T. Ikeda, C. Tateno, K. Yoshizato, and T. Yokoi Humanization of Excretory Pathway in Chimeric Mice with Humanized Liver Toxicol. Sci., June 1, 2007; 97(2): 533 - 538. [Abstract] [Full Text] [PDF]

				D. W. Nebert Comparison of gene expression in cell culture to that in the intact animal: relevance to drugs and environmental toxicants. Focus on "Development of a transactivator in hepatoma cells that allows expression of phase I, phase II, and chemical defense genes" Am J Physiol Cell Physiol, January 1, 2006; 290(1): C37 - C41. [Full Text] [PDF]

				M. Katoh, T. Matsui, H. Okumura, M. Nakajima, M. Nishimura, S. Naito, C. Tateno, K. Yoshizato, and T. Yokoi EXPRESSION OF HUMAN PHASE II ENZYMES IN CHIMERIC MICE WITH HUMANIZED LIVER Drug Metab. Dispos., September 1, 2005; 33(9): 1333 - 1340. [Abstract] [Full Text] [PDF]

				M. Katoh, T. Matsui, M. Nakajima, C. Tateno, Y. Soeno, T. Horie, K. Iwasaki, K. Yoshizato, and T. Yokoi IN VIVO INDUCTION OF HUMAN CYTOCHROME P450 ENZYMES EXPRESSED IN CHIMERIC MICE WITH HUMANIZED LIVER Drug Metab. Dispos., June 1, 2005; 33(6): 754 - 763. [Abstract] [Full Text] [PDF]