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1996 Fiscal Year Final Research Report Summary

DEVELOPMENT OF NOVEL ALTERNATIVE METHODS FOR THE PREDICTION OF DRUG METABOLISM IN HUMANS

Research Project

Project/Area Number 06557124
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section試験
Research Field Biological pharmacy
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

KAMATAKI Tetsuya  Hokkaido Univ., Fac.of Pharm.Sci., Prof., 薬学部, 教授 (00009177)

Co-Investigator(Kenkyū-buntansha) NAKAYAMA Kazuo  Hokkaido Univ., Fac.of Pharm.Sci., Instructor, 薬学部, 助手 (20261323)
YOKOI Tsuyoshi  Hokkaido Univ., Fac.of Pharm, Sci., Associate Prof., 薬学部, 助教授 (70135226)
Project Period (FY) 1994 – 1996
KeywordsAlternatives / P450 / Transgenic mouse / CYP3A7 / p53-Knockout mouse / Cell expression system / Hepatocyte
Research Abstract

We have succeeded in establishing cell lines which stably expressed human NATI,NAT2, CYP1A2, CYP2E1, CYP3A4 and CYP3A7. We examined the cytotoxicity and mutagenicity of IQ and MeIQx in the cells expressing human CYP1A2, NAT1, and NAT2 alone or in combinations. The results led to the following conclusions : (a) no activation to produce cytotoxic and mutagenic metabolites from either compound was achieved by each enzyme alone ; (b) CYP1A2 in combination with NAT2 efficiently activated the compounds ; (c) expression of CYP1A2 togather with NAT1 was not effective for mutagemic activation. The cells expressing CYP2E1 showed 7-ethoxycoumarin OMICRON-deethylase activity. Moreover, these cells showed higher sensitivity to DMN in cytotoxicity assay as compared to parental cells. The cells expressing CYP3A4 and CYP3A7 were more sensitive to aflatoxin B_1 than parental cells. These cell lines provide a new valuable panel for studying the human metabolism of xenobiotics with an ability to directly … More relate to P450-catalyzed metabolism.
(2) We established several lines of transgenic mice harboring a CYP3A7 transgene.Of all the six transgenic lines established, M2 mice expressed the CYP3A7 gene in many tissues such as in the kidney, small intestine, and skin, etc, while M10 mice expressed the CYP3A7 transgene in the liver and testis, at both mRNA and protein levels. The potential application of this transgenic mice in drug metabolism was assessed using midazolam (MZ) as a substrate. Administration of this drug through intraperitoneal injection into adult mice of line M10 resulted in significantly higher levels of both 1'-OH-MZ and 4-OH-MZ in mouse serum. Kinetic study using liver microsomes from adult M10 mice indicated a higher Vmax with the same Km values in 1'-hydroxylation of MZ as compared with nontransgenic mice. These results indicate that CYP3A7 expressed in these transgenic mice possesses normal catalytic activities towards MZ with characteristics similar to those in the human livers. Less

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] Y. Li et al.: "Establishment of transgenic mice carrying human fetus-specific CYP3A7." Arch. Biochem. Biophys.329. 235-240 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Yokoi et al.: "A new CYP2D6 allele with a nine base insertion in exon 9 in a Japanese population associated with poor metabolizer phenotype." Pharmacogenetics.6. 395-401 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. Nakamura et al.: "CYP2D6 is a principal cytochrome P450 responsible for metabolism of the histamine H1 antagonist promethazine in human liver microsomes." Pharmacogenetics. 6. 449-457 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. Li et al.: "Perinatal expression and inducibility of human CYP3A7 in C57BL/6N transgenic mice." Biochem. Biophys. Res. Commun.228. 312-317 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. Takahashi et al.: "Expression of aryl hydrocarbon receptor (AhR) and Ah receptor nuclear translocator (Arnt) in adult rabbits known to be non-responsive to cytochrome P450 1A1 (CYP1A1) inducers." Eur. J. Biochem.242. 512-518 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. Li et al.: "In vivo activation of aflotoxin B_1 in C57BL/6N mice carrying a human fetus-specific CYP3A7 gene." Cancer Res.57. 641-645 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 鎌滝哲也他: "薬物代謝の影響:塩酸イリノテカンの副作用を例として"バイオアベイラビリティーの改善を目指して"" 現代医療社(印刷中), (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yong Li, Tsuyoshi Yokoi, Ryuji Kitamura, Makoto Sasaki, Masae Gunji, Motoya Katsuki and Tetsuya Kamataki: "Establishment of transgenic mice carrying human fetus-specific CYP3A7" Arch.Biochem.Biophys.329. 235-240 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tsuyoshi Yokoi, Yasuyuki Kosaka, Michihiro Chiba, Kan Chiba, Hidefumi Nakamura, Takashi Ishizaki, Moritoshi Kinoshita, Kunio Sato, Frank J.Gonzalez and Tetsuya Kamataki: "A new CYP2D6 allele with a nine base insertion in exon 9 in a Japanese population associated with poor metabolizer phenotype" Pharamacogenetics. 6. 395-401 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Katsunori Nakamura, Tsuyoshi Yokoi, Kazuaki Inoue, Noriaki Shimada, Noriko Ohashi, Toshiyuki Kume and Tetsuya Kamataki: "CYP2D6 is a principal cytochrome P450 responsible for metabolism of the histamine H1 antagonist promethazine in human liver microsomes" Pharmacognetics. 6. 449-457 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yong Li, Tsuyoshi Yokoi, Kiyomi Hattori, Makoto Sasaki, Motoya Katsuki and Tetsuya Kamataki: "Perinatal expression and inducibility of human CYP3A7 in C57BL/6 transgenic mice" Biochem.Biophys.Res.Commun.228. 312-317 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yoshiki Takahashi, Kazuo Nakayama, Tsukasa Shimojima, Susumu Itoh and Tetsuya Kamataki: "Expression of aryl hydrocarbon receptor (AhR) and Ah receptor nuclear translocator (Arnt) in adult rabbits known to be non-responsive to cytochrome P450 1A1 (CYP1A1) inducers" Eur.J.Biochem.242. 512-518 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yong Li, Tsuyoshi Yokoi, Motoya Katsuki, Jia-Sheng Wang, John D.Groopman and Tetsuya Kamataki: "In vivo activation of aflatoxin B_1 in C57BL/6N mice carrying a human fetus-specific CYP3A7 gene" Cancer Res.57. 641-645 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tetsuya Kamataki, Tsuyoshi Yokoi, Eiichi Nagai, Yu Sakata, Masaki Aburada, Hisao Hagiwara and Kiyoshi Takasuna: Effects of drug metabolism of drugs in intestine-An example to improve the side effects of irinotecan hydrochloride. In "Improvement of Bioavailability of Drug" ed.by Yuichi Sugiyama (in press). Gendai Iryosha, (1997)

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Published: 1999-03-09  

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